• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This invention relates to a method and a device for the manufacture of crimped multifilament plastic yarn by applying a texturing process, wherein a stream of heated gaseous medium is introduced into a texturing channel (1), (2), (3), wherein plastic filaments (4 ), (5), (6) are displaced and deformed by the heated gaseous medium in the texturing channel (1), (2), (3), wherein both the temperature and the flow of the gaseous medium are measured, and wherein the heat flow is regulated. To that end, the device comprises a control device (50) and per texturing channel (1), (2), (3) at least one temperature sensor (60), (61), (62) and a flow sensor (57), (58), (59) ).
    公开号:BE1022963B1
    申请号:E2015/5272
    申请日:2015-04-24
    公开日:2016-10-24
    发明作者:Ermete Corbellini
    申请人:Iropa Ag；
    IPC主号:
    专利说明:

    Method and device for manufacturing crimped multifilament plastic yarn
    This invention relates to a method for manufacturing at least one crimped multifilament plastic yarn by applying a texturing process, wherein a stream of heated gaseous medium is introduced into a texturing channel, wherein a number of plastic filaments are displaced and deformed by the heated gaseous medium in the texturing channel. and wherein the deformed filaments are fixed so that a frizzy plastic yarn is obtained.
    In the production of plastic yarns, separate filaments are formed from a thermoplastic plastic, such as, for example, polypropylene, polyester or polyamide. This is done according to an extrusion process. A number of these filaments are joined together to form a multifilament yarn. It is known to change and improve the properties of a multifilament yarn by a texturing process, for example to make it more suitable for certain applications. This is done, for example, by introducing a multifilament yarn into a texturing channel and allowing it to pass through a stream of hot air so that the filaments are deformed. The yarn is then fixed so that a crimped plastic yarn is obtained. The yarn hereby becomes more voluminous and has a better covering capacity, which makes these yarns particularly suitable for use in weaving and tufting carpets and the like.
    This invention also relates to a device for manufacturing at least one crimped multifilament plastic yarn by applying a texturing process, comprising at least one texturing channel and means for supplying a stream of heated gaseous medium to each texturing channel, wherein each texturing channel comprises an entrance along which plastic filaments can be introduced into the channel and at least one opening through which the heated gaseous medium can be introduced into the texturing channel to heat the filaments and to carry them along in the texturing channel, means for deforming the filaments, and an exit through which the deformed filaments enter the texturing channel can leave, the device also comprising means for fixing the filaments of each texturing channel in a deformed state.
    Known texturing devices, such as the device described in US 6 308 388 B1, comprise a texturing unit in which two texturing channels are provided parallel to each other. A respective multifilament yarn is introduced into each texturing channel via an entrance opening. In the vicinity of this entrance opening a number of inlet openings are provided along which hot air is blown into the texturing channel at a high speed. The multifilament yarn is entrained by the hot air in the texturing channels. This air has a temperature that is sufficiently high to bring the plastic filaments to a temperature at which the plastic is soft and easily deformed. Furthermore, each texturing channel also comprises means for deforming the yarn which, for example, take the form of a "stuffer box", a wider area of the channel, provided with outlet openings through which air can leave the texturing channel. In this zone, the speed of the air and of the yarn decreases sharply, compressing the yarn into a yarn plug and deforming the filaments of the yarn. The yarn is further displaced as a yarn plug in the texturing channel in the direction of the exit opening of the texturing channel.
    After leaving the texturing channels, the two yarn plugs are laid on the jacket surface of a slow-rotating cooling drum for cooling. The deformations of the filaments are hereby fixed. The yarn thus textured is then led away from the surface of the cooling drum and optionally subjected to additional processing, and is finally wound onto bobins as a crimped textile yarn.
    It is of great importance that the same yarn quality is always obtained in the production of such crimped textile yarn. This means, on the one hand, that the same textile yarn, viewed over its entire yarn length, must not exhibit any quality differences, but also that yarns from different texturing processes must have substantially the same yarn quality.
    It is known that the properties of such a crimped textile yarn are determined by the temperature to which it is subjected in the texturing channel.
    NL 175 325 describes a method for the production of a frizzy textile yarn by applying a texturing process with the characteristics indicated above. To achieve uniform yarn quality, the temperature is regulated in every texturing process. Assuming that the location of the take-off end of the yarn plug on the cooling surface is an indication of the yarn quality, this location is detected, and the temperature is controlled to reach a predetermined target location.
    This method is quite complex and produces a frizzed textile yarn with a quality that still shows too much variation. Even with yarns that are produced in different texturing processes, the mutual quality differences are disturbing and the demand arises to limit them even further.
    The object of this invention is to remedy the disadvantages indicated above by providing a method and a device for the manufacture of crimped multifilament plastic yarns of a more uniform quality.
    This objective is achieved on the one hand by providing a method with the characteristics from the first paragraph of this description, in which both the temperature and the flow of the gaseous medium are measured, and wherein the heat supply per unit of time that generated by the introduction of the gaseous medium is realized, is controlled by adjusting or controlling at least one of the parameters that influence this heat supply.
    There is a stronger correlation between the temperature of the gaseous medium and the yarn quality between the amount of heat that is introduced into the texturing channel via the gaseous medium per unit of time (the heat supply per unit of time or the heat flow rate) and the final yarn quality.
    In addition to the temperature of the gaseous medium, among other things, the flow rate of the introduced flow of the gaseous medium is also a parameter that influences the yarn quality. For the same temperature of the gaseous medium, a relatively high flow rate will produce a different yarn quality than a relatively low flow rate.
    The heat supply per unit of time (hereinafter also referred to as "the heat supply") is a parameter that takes into account both the temperature and flow rate of the introduced stream of gaseous medium, two parameters that significantly influence the yarn quality. This results in a control that allows much less variation in yarn quality. Temperature is here preferably understood to mean the absolute temperature of the gaseous medium upon its introduction into the texturing channel. For example, it can be simplified to assume that the temperature-dependent component of the heat supply to the yarn is mainly determined by the temperature of the gaseous medium when it is introduced into the texture channel. More precisely, the difference between the temperature of the introduced stream of the gaseous medium and the temperature of the gaseous medium upon leaving the texturing channel can be used as an indication of the temperature-dependent component of the heat supply.
    In order to more accurately determine the heat supply to the yarn, in addition to the temperature and flow rate of the introduced gaseous medium flow, it is also possible to measure the temperature and flow rate of the flow of gaseous medium exiting the texturing channel. The flow rate of this outgoing flow of gaseous medium can be influenced by changing the back pressure at the outlet opening (s). Other relevant parameters that can be taken into account are the heat transfer from the gaseous medium to the yarn, the flow rate or the speed of the yarn and the heat of loss of the components, ... In order to minimize environmental losses, preference is given to good insulation of the texturing channel and of its environment ensured.
    With this control, the heat supply can be controlled directly by determining an indicative value for the effective heat supply on the basis of the measured values for temperature and flow rate, and by adjusting the temperature and / or the flow rate so that a target value for the heat supply becomes reached or retained.
    The heat supply will preferably be controlled indirectly by controlling the temperature and the flow so that a respective target value is achieved or maintained for these two parameters. The desired heat supply is then achieved when the flow rate and temperature of the gaseous medium have reached their respective target values. If only one of the two parameters is controlled, the target value for the controlled parameter is a variable value that is adjusted as a function of the measurement of the other parameter, so that the target value of the controlled parameter and the measured value of the other parameter are the desired heat supply deliver.
    Temperature and flow can be controlled together in the same control loop, but can also be controlled in separate control loops.
    At the same time, the temperature must also have a value that produces a good yarn. The filaments must, after all, be heated to a temperature at which they are easily deformable. This temperature is of course dependent on the raw material used. Around the ideal temperature, for example, a raw material-dependent target zone for the temperature is determined within which the filaments are sufficiently heated, and within which the temperature is adjustable to control the heat supply as explained above.
    A highly preferred control is controlling the heat supply by controlling the flow of the gaseous medium.
    It is also possible to control the heat input in two or more texturing processes carried out simultaneously so that the mutual difference between the heat input in two or more processes is minimized. This objective of regulating does not necessarily require a target value. For example, a certain limit can be determined for the mutual differences in heat supply, wherein the heat supply in one or more processes is controlled such that this limit is not exceeded and / or wherein a warning signal is generated when this limit is exceeded.
    The terms value, measured value and target value in the explanation above and in the following naturally refer not only to a numerical expression of the size of the said parameter (s), but also to any other possibility of expressing it, such as, for example, a signal that is representative of the size of one or more parameters or that contains or transmits data about them.
    The flow rate of the gaseous medium flow is preferably measured before the gaseous medium is heated. The temperature is preferably measured just before the gaseous medium is introduced into the texturing channel. Air is preferably used as the gaseous medium.
    It is also possible to produce different groups of yarns simultaneously in two or more different texturing devices with their own texturing channels and an associated control device. These different control devices are then preferably also provided to achieve the same target value for that heat supply per unit of time and / or to minimize differences between the heat supply in the texturing channels of the different texturing devices. To this end, the various control devices can be provided with means for automatically passing on information about the heat supply to each other in their respective texturing channels.
    In controlling the heat supply per unit time, the heat supply is preferably changed by changing or controlling the flow rate of the gaseous medium and / or the temperature of the heated gaseous medium.
    These parameters largely determine the heat supply per unit of time and can be changed with relatively simple means. The heat supply can be controlled by only changing the flow rate of the gaseous medium flow, while the temperature is not changed. The temperature is then set to a fixed value, but is not changed as a function of the heat supply. For example, the temperature can be controlled in a separate control circuit to a fixed target value. The flow control can be done by controlling the supply pressure of the gaseous medium, or by means of a control valve or any other flow-determining device.
    The heat supply can also be controlled by only changing the temperature while the flow rate is not changed. The gaseous medium is brought, for example, to the desired temperature by means of a heat exchanger.
    The heat supply can also be controlled by changing or controlling both the temperature and the flow rate of the gaseous medium flow.
    A highly preferred method provides for a control of the heat supply per unit of time by controlling the flow of the gaseous medium flow to achieve a certain target value when a deviation between the measured value and the target value is detected, and / or by controlling the temperature of the stream of heated gaseous medium to reach a certain target value when a deviation between the measured value and the target value is detected.
    The heat supply per unit of time is hereby indirectly controlled by controlling at least one of the aforementioned parameters (temperature and / or flow) that influence this heat supply. If both parameters are regulated, they naturally each have a respective target value. Both target values are then preferably determined such that a desired heat supply per unit of time is achieved when those target values are achieved.
    If only one of the two mentioned parameters (temperature and flow) is controlled, then the target value for the controlled parameter is a value that is adjusted as a function of the measurement of the unregulated parameter, so that the target value of the one parameter (the controlled parameter) and the measured value of the other parameter (the non-regulated parameter) produces the desired heat supply. Such a method is described in the following section.
    A particularly preferred method provides that in each texturing process either only the flow of the flow of gaseous medium is controlled to achieve a certain target value, this target value being determined such that the flow of gaseous medium at a flow rate with this target value and at the measured temperature produces a desired heat supply per unit of time, or only the temperature of the stream of heated gaseous medium is controlled to achieve a specific target value, this target value being determined such that the stream of gaseous medium at a temperature with this target value and at the measured flow yields a desired heat supply per unit of time.
    In a method in which the flow rate is regulated to achieve a specific target value, the flow rate can for instance be changed in a very simple manner by changing or controlling the pressure on the supplied gaseous medium.
    For example, in a production process where the gaseous medium has a common supply from which the medium is supplied to several simultaneously working texturing processes, a common pressure can be set which is the same for the different texturing processes. The device can then be provided to automatically derive a target value for the flow in one or more of the texturing channels from that set pressure.
    In a possible method according to this invention, the plastic filaments are compressed in each texturing channel to form a respective yarn plug, and the yarn plugs are moved onto a moving cooling surface after leaving the texturing channels.
    The speed of movement of the moving cooling surface is adjustable depending on the speed at which the yarn leaves the texturing channel. This movement speed can also be adjusted in function of the yarn quality. The cooling surface is, for example, a surface provided with perforations, while under the surface an underpressure is created whereby ambient air is sucked in via the perforations. This air flow on the one hand ensures better cooling of the yarn and on the other hand ensures that the yarn is pressed against the cooling surface and held in a fixed position. The cooling surface is, for example, the jacket surface of a rotating cooling drum.
    In a particularly advantageous method, the plastic filaments are compressed in each texturing channel to form a respective yarn plug, the compressed yarn being added to one end of the yarn plug while being pulled away at the other end of the yarn plug, called the take-off end, so that the yarn plug unravels and the yarn is discharged in a frizzed state; the location of the take-off end of each yarn plug is detected, and in each texturing process one or more parameters are controlled based on the detected location to prevent the locations of the take-off ends of the yarn plugs from being outside a predetermined take-off zone.
    During the production process, a yarn plug is formed in each texturing channel which continuously grows at the rear by adding yarn to the texturing channel, and from which the crucible yarn is continuously pulled away at the front, which is outside the texturing channel. It is established that the front end of the yarn plug (the removal end) is not always in the same place during the production process. It is also observed that a displacement of the removal end of the yarn plug indicates a change in yarn quality.
    By also controlling at least one production parameter in function of changes in the location of the take-off end, with the aim of reducing the changes in the take-off location of the same yarn plug and / or to keep the difference between the take-off locations of different yarn plugs as small as possible, obtained frizzed yarns with even less variation in their quality. Changing take-off locations of the same yarn plug or a mutual difference between the take-off locations of different yarn plugs at the same set target value for the heat supply are an indication that the same set target value for the heat supply does not necessarily result in the same effective value of the heat supply for the same texturing channel over a certain time interval or between the different texturing channels due to the influence of other uncharged process parameters and / or changing process conditions. By adjusting and / or controlling at least one production parameter, the effective value of the heat supply is kept constant and equal as much as possible.
    In another particularly preferred method, at least two crimped multifilament yarns are made simultaneously by applying a respective texturing process, wherein in each texturing process a number of plastic filaments are introduced into a respective texturing channel through a respective stream of heated gaseous medium; both the temperature and the flow rate of each stream of gaseous medium are measured, and for each texturing channel, the heat supply per unit of time realized by the introduction of the heated gaseous medium is controlled to minimize the differences between the heat supply in the different texturing channels .
    This method makes it possible at the same time to produce several crimped yarns with an almost identical quality in an automated process. The control as a function of the heat supply per time unit ensures a much more efficient control of the yarn quality. As stated above, this control does not require a target value for this heat supply or for the parameters that determine this heat supply. After all, it is sufficient to keep the differences between the heat supply per unit of time in two or more texturing processes as small as possible.
    Preferably, the heat supply per unit of time is controlled in the different texturing channels in order to achieve or maintain a common target value.
    More preferably, the heat supply per unit of time in each texturing channel is controlled by controlling the flow rate of the gaseous medium flow to achieve a specific target value and by controlling the temperature of the heated gaseous medium flow to achieve a specific target value, and the same target values are used for the different texturing channels.
    A control of the heat supply in each channel by controlling both the flow rate and the temperature of the flow of gaseous medium can be realized with relatively simple means and, moreover, is particularly efficient.
    The heat supply per unit of time can be controlled in any texturing channel by simply controlling the flow. The target value for the flow of the gaseous medium flow can be the same for the different texturing channels. However, this target value can also be different, for example to take account of contamination of a channel.
    For example, the following parameters can be measured for each texturing channel: the pressure of the flow of gaseous medium, the flow rate of the flow of gaseous medium, and the temperature of the flow of heated gaseous medium, and at least the pressure and / or the temperature to obtain a desired heat supply per unit time in each texturing channel.
    In a particularly efficient method, the plastic filaments are compressed in each texturing channel to form a respective yarn plug, the compressed yarn being added to one end of the yarn plug while being pulled away at the other end of the yarn plug, called the take-off end, so that the yarn plug unravels and the yarn is discharged in a crimped state; the locations of the take-off ends of the different yarn plugs are detected; in each texturing process, one or more parameters are controlled based on the detected location to prevent the spacing between the furthest locations from exceeding a predetermined maximum or to prevent the locations of the take-off ends of the yarn plugs from occurring outside a predetermined specific collection zone.
    It is also found that a different location of the take-off end of two yarn plugs produced simultaneously indicates a mutually different yarn quality.
    By also controlling one or more production parameters to keep the mutual difference between the removal locations of different yarn plugs as small as possible, two or more crimped yarns with even less mutual quality differences can be produced. It can also be arranged, whether or not together with the first possibility, that the removal ends remain within the limits of a predetermined collection zone.
    If two groups of yarns are produced simultaneously, while a different control unit is provided for each group to control one or more production parameters, one can additionally or as an alternative to the above control options of the location of the take-off end, for each group of yarns, continuous or repetitive, automatically determine a location representative of the detected locations of the take-off ends of the different yarn plugs of that group (for example, the average of the different locations of the yarn plugs of the group), and provide the control units to control the parameters so that the differences between the representative locations associated with the different groups of yarns are minimized.
    Also in a single texturing process, one or more parameters can be controlled based on the detected take-off location of the yarn plug to prevent the take-off end of the yarn plug from being outside a predetermined take-off zone.
    In this method, in any texturing process, for example, at least one of the following parameters can be controlled based on the detected location of the take-off end of the yarn plug formed in that texturing process: the temperature, flow rate and pressure of the gaseous medium.
    These parameters can also be controlled in a single texturing process on the basis of a detected sampling location.
    The detection of the locations of the take-off ends is done, for example, by capacitive detection or by making image recordings during each texturing process on which the take-off ends of the different yarn plugs are visible, each detection of the locations of the take-off ends being made by automatic analysis and / or processing of one or more image recordings. The image recordings are preferably done by means of a camera.
    A capacitive detection means, for example, that the density of the yarn plug is measured. Instead of a camera or as an additional detection means, other optical detection means can also be used to detect the removal locations of the yarn plugs.
    Also in a single texturing process one can detect the removal location of the yarn plug with one or more of these detection means.
    The efficiency of the control can be further increased by a method in which the locations of the take-off ends of the different yarn plugs are detected at least two consecutive times, whereby the location is expected for each take-off end based on the changes thus made to these locations at a later time, and wherein control means are provided to anticipate at an expected location outside the predetermined collection zone by controlling a parameter in the relevant texturing process to keep the collection end within this collection zone.
    In this way you can respond even faster and prevent future unacceptable quality deviations. The said parameter can again be one or more of the said production parameters (temperature, pressure or flow rate of the gaseous medium), or another parameter which influences the yarn quality.
    The above stated object is also achieved by providing a device with the features from the third paragraph of this description, wherein the device also comprises for each texturing channel a temperature sensor to measure the temperature of the heated gaseous medium, and a flow sensor to measure the temperature. measuring the flow rate of the supplied gaseous medium, and wherein the device also comprises a control device which is provided for regulating the heat supply per unit of time realized by the introduction of the flow of gaseous medium into each texturing channel.
    For the beneficial effects of controlling the heat supply per unit of time, we refer to what precedes. The device comprises a control device for automatically realizing this control, so that crimped multifilament plastic yarns can be manufactured at a high production speed and with a very uniform quality.
    The flow sensor and the temperature sensor are preferably arranged one after the other at the level of the entrance along which the gaseous medium is introduced into the texturing channel. They measure the properties of the medium that pulls the yarn into the texturing channel. The flow rate of the gaseous medium flow is preferably measured before the gaseous medium is heated. The temperature is preferably measured just before the gaseous medium is introduced into the texturing channel. Air is preferably used as the gaseous medium.
    In a preferred embodiment, the device comprises for each texturing channel a controllable heating device for heating the gaseous medium, said control device being provided to change a setting of the heating device in the event of a deviation between a specific target temperature and the measured temperature in order to change the temperature of the heating device. to bring heated gaseous medium to the target temperature, and / or a flow-determining device with which the flow of the supplied flow of gaseous medium can be controlled, said control device being provided for, in the event of a deviation between a specific target flow rate and the measured flow rate, of the flow-determining device to bring the flow of the flow of gaseous medium to the target flow, and the control device is provided to control the heat supply per unit of time by controlling the temperature and / or the flow of the gaseous medium.
    By controlling at least one of the two parameters that strongly influence the heat supply, a highly efficient control of the heat supply per unit of time is achieved indirectly, and moreover such control can be realized with relatively simple means.
    In a highly preferred embodiment, said flow determining device is a pressure regulator in cooperation with said regulating device, said regulating device being provided to change the pressure in the flow of gaseous medium in order to bring the flow to the target flow.
    The control device may also be provided to control the pressure to achieve or maintain a predetermined target value for the pressure.
    In a production process where the gaseous medium has a common supply from which the medium is supplied to several simultaneously working texturing processes, the device can be provided with means for setting or controlling a common pressure that is the same for the different texturing processes. The device or the control device can then be provided to automatically derive a target value for the flow in one or more of the texturing channels from that set pressure.
    In another embodiment, the control device is provided to control one of the measured parameters, being flow rate and temperature, in each texturing process to reach a certain target value; the target value for each texturing process is determined so that the flow of gaseous medium at this target value of one parameter (the controlled parameter) and at the measured value of the other parameter (the unregulated parameter) in the texturing channel a desired heat supply per unit of time yields.
    Preferably, the control device is provided to control the heat supply per unit of time in each texturing channel by both controlling the flow of the stream of gaseous medium to achieve a specific target value and controlling the temperature of the stream of heated gaseous medium to control a specific target value reach.
    In a particular embodiment of the device according to the present invention, each texturing channel is provided to form a respective yarn plug with a detachable end, from which the yarn is pulled to discharge it in the crimped state, and the device comprises at least one location detecting means for detect the location of the take-off end of each yarn plug.
    Since a displacement of the take-off end of the yarn plug indicates a change in yarn quality, the device can also be provided for controlling at least one production parameter as a function of changes in the location of the take-off end, with the aim of changing the take-off location of the same to reduce the yarn plug and / or to keep the difference between the removal locations of different yarn plugs as small as possible. Thanks to all these measures, the quality differences in crimped multifilament plastic yarns can be reduced even further.
    A particularly preferred device according to the present invention comprises at least two texturing channels for producing respective crimped multifilament yarns, while the control device is provided for controlling the heat supply per unit of time, which is realized by introducing the heated gaseous medium into each texturing channel to control the minimize differences between the heat input in the different channels.
    This device makes it possible at the same time to produce several crimped yarns of an almost identical quality at the same time. The control as a function of the heat supply per time unit ensures a much more efficient control of the yarn quality. As stated above, this control does not require a target value for this heat supply or for the parameters that determine this heat supply. After all, it is sufficient to keep the differences between the heat supply per unit of time in two or more texturing processes as small as possible.
    The control device can thereby be provided to control the heat supply per unit of time in the different texturing channels in order to achieve or maintain a common target value.
    In another embodiment of this device, the texturing channels are provided to form respective yarn plugs with take-off ends, from where the yarn is pulled away to discharge it in the crimped state, the device comprises at least one location detecting means around the locations of the take-off ends of the automatically detect different yarn plugs during the texturing process, and the control device is provided to control one or more parameters in each texturing process, based on the location detected by the location detecting means, in order to prevent the distance between the furthest away from each other locations exceeds a predetermined maximum.
    If the take-off ends of different yarn plugs produced simultaneously are at different locations, it is assumed that this indicates a difference in quality of the yarns produced. A control device can be provided that controls at least one production parameter in function of those location differences. In this context, the aim can be to minimize these location differences and / or to ensure that these location differences do not exceed a certain maximum and, for example, remain within a predetermined collection zone.
    In a possible embodiment, at least one location detecting means is provided for realizing a capacitive detection of the location of the receiving ends.
    Preferably at least one location-detecting means comprises an image-recording device which is provided during one texturing process to make one or more image-recordings on which the take-off ends of the different yarn plugs are visible, and an image-processing and / or image-analysis device which is provided around the locations of the take-off ends by automatic analysis and / or processing of one or more image recordings.
    The image recording device is preferably provided for continuous or repetitive image recording. Preferably, said image recording device comprises a camera. Of course, any other optical detection means can also be used.
    In a particularly preferred embodiment, each texturing channel is provided to form a respective yarn plug, and the device comprises a movable cooling surface which is provided to move the yarn plugs after leaving the texturing channels while the yarns are crimped from the cooling surface located on the cooling surface. yarn plugs are pulled away.
    The speed at which the cooling surface advances is preferably also adjustable. The movable cooling surface can for example be the jacket surface of a rotating drum. The cooling surface is preferably provided with perforations along which cooling air is sucked in by a suction device located below the cooling surface. The air flow causes the yarns to experience a downward force, so that they are kept stable on the cooling surface.
    In order to further clarify the features of the invention, a detailed description of a possible embodiment of a texturing device according to the present invention follows. We emphasize that this is only an example of the many possible embodiments within the scope of the invention, and that this description can in no way be regarded as a limitation of the scope of protection. In this detailed description reference is made by reference numerals to the appended figure 1, which is a schematic representation of a texturing device according to the present invention, and figure 2, which is a more detailed schematic representation of the texturing unit of the texturing device of figure 1.
    The texturing device shown in Figure 1 comprises a texturing unit (13) (shown in detail in Figure 2) in which three texturing channels (1), (2), (3) are provided with a respective yarn inlet (1a), (2a), (3a) for introducing a multifilament plastic yarn (4), (5), (6) and a respective yarn exit (1b), (2b), (3b) along which it forms a yarn plug (7), (8), (9) compressed textured yarn can leave the texturing channels (1), (2), (3). Furthermore, the texturing device also comprises a rotatable cooling drum (20) which can be driven by a motor (22) (see also figure 1).
    Compressed air is supplied from a common supply line (30) under high pressure (for example a pressure between 5 and 9 bar, preferably between 6 and 8 bar, preferably 7 bar) via three separate supply lines (31), (32), (33) the respective texturing channels (1), (2), (3) (see also figure 1). Each texturing channel comprises an access opening (not visible on the figure) to which a supply line (31), (32), (33) is connected and along which the compressed air can be introduced into the texturing channel. Each supply line (31), (32), (33) is interrupted in the vicinity of the texturing channels (1), (2), (3) by a heating element (34), (35), (36) so that the supplied air can be heated to a high temperature (for example a temperature between 120 ° C and 220 ° C, preferably between 130 ° C and 200 ° C, preferably between 150 ° C and 180 ° C) before it is placed in the texturing channel (1) , (2), (3) is blown.
    The device further comprises a control device (50) with associated sensors and control units as set out below.
    There is a pressure sensor (54), (55), (56) and a pressure regulator (51), (52), (53) per supply line (31), (32), (33). Each pressure sensor (54), (55), (56) measures the pressure of the compressed air in a respective supply line (31), (32), (33) in the section in front of the heating elements (34), (35), (36), and is provided to transmit a measurement signal (Pm1), (Pm2), (Pm3) to the control device (50), the magnitude of the pressure in this supply line (31), (32), (33) send.
    Each pressure regulator (51), (52), (53) is provided to change the pressure in the associated supply line (31), (32), (33) in accordance with a control signal (Pr1), (Pr2), (Pr3 ) that is output from the control device (50).
    For each supply line (31), (32), (33), a flow meter or flow sensor (57), (58), (59) is also provided, which is provided around a measuring signal (Dm1), (Dm2), (Dm3) that indicates the magnitude of the flow rate in the relevant supply line (31), (32), (33) to the control device (50). The flow rate in each supply line is measured in the part that is between the pressure sensor (54), (55), (56) and the heating element (34), (35), (36).
    In each texturing channel (1), (2), (3), near the opening where the compressed air is blown into the texturing channel, a temperature sensor (60), (61), (62) is placed. Each temperature sensor (60), (61), (62) is provided to transmit a measurement signal (Tm1), (Tm2), (Tm3) to the absolute temperature in the respective supply line (31), (32), (33) to control the control unit (50). The setting of each heating element (34), (35), (36) is adjustable and is provided to change its setting such that the temperature of the gaseous medium in the associated supply line (31), (32), (33) is modified in accordance with a control signal (Tr1), (Tr2), (Tr3) outputted by the control device (50). The temperature is controlled in a separate control loop to reach or maintain a predetermined value, this value depends on the raw material. In this embodiment, this temperature is not controlled to affect the heat supply. The regulation of the heat supply here is done exclusively by controlling, through the pressure, the flow in each supply line (31), (32), (33) on the basis of the measured temperature and the measured flow of the air flow.
    For each texturing channel, the measurement signal (Tm1), (Tm2), (Tm3) from the temperature sensor (60), (61), (62) and the measurement signal (Dm1), (Dm2), (Dm3) from the flow sensor (57) ), (58), (59) to which the heat supply is in the relevant texturing channel (1), (2), (3).
    The control device is provided on the basis of these measurement signals for each texturing channel to detect that the heat supply changes over time. This can be a change from the original value or from a predetermined target value. The control device is provided, when such changes are detected, to change the flow rate in the associated supply line (31), (32), (33) such that the heat supply is brought back to the desired level. As stated above, a specific target value can be set for the heat supply per unit of time, but a specific target value can also be set for the flow rate which is determined such that the compressed air flow with the measured temperature and with a flow rate equal to that target value, desired heat supply. This target value will then be automatically adjusted to the measured temperature in the course of the production process.
    In an additional or an alternative setting, the control device (50) can also be provided for, on the basis of said measuring signals (Tm1), (Tm2), (Tm3) of the temperature sensor (60), (61), (62) and of detecting said measurement signals (Dm1), (Dm2), (Dm3) from the flow sensor (57), (58), (59) that there are mutual differences between the heat supply in the three texturing channels (1), (2), (3) or that these differences exceed a predetermined limit and, when such differences are detected, to change the flow rate in one or more supply lines such that the heat supply in the three texturing channels (1), (2), (3) ) is brought back into line or within the predetermined limits.
    Changing the flow in a specific supply line (31), (32), (33) is done by changing the pressure in the relevant supply line. The pressure is then changed in such a way that the desired flow in the supply line is obtained. The pressure in a supply line (31), (32), (33) thus becomes, by means of a control signal (Pr1), (Pr2), (Pr3) sent to the pressure regulator (51), (52), (53) , controlled as a function of the difference between the measured flow rate (Dm1), (Dm2), (Dm3) in that supply pipe and the flow rate required to achieve the desired heat supply at the temperature measured at a given moment, the The purpose of the scheme is of course to bring this difference to zero.
    With this device, crimped multifilament plastic yarn is produced from thermoplastic plastics, such as, for example, polypropylene, polyester, polyamide 6 or polyamide 6.6. The production of such plastic yarn from polypropylene is described as an example. For other raw materials, this production is completely analogous.
    Filaments are formed from polypropylene according to a known extrusion process, and by combining various of these filaments (between 120 and 288 filaments, preferably between 150 and 250) in a known manner, a multifilament yarn is formed. In order to obtain a crimped yarn of a particularly uniform quality, for example to make the yarn suitable for weaving carpets, these yarns are subjected to a texturing process using the device described above. The crimped yarn typically has a linear density (titer) that is between 1000 dtex (grams per 10 km length) and 3000 dtex.
    Three polypropylene multifilament yarns (4), (5), (6) are introduced via the yarn entrances (1a), (2a), (3a) into a respective texturing channel (1), (2), (3), while compressed air is supplied to a high temperature (for example a temperature between 120 ° C and 220 ° C, preferably between 130 ° C and 200 ° C, preferably between 150 ° C and 180 ° C) is blown into these texturing channels at a high speed. The compressed air is supplied via the common pipe (30) under a pressure of a pressure between 5 and 9 bar, preferably between 6 and 8 bar, preferably 7 bar, and is supplied via the supply pipes (31), (32), (33) and the heating elements (34), (35), (36) brought to the respective texturing channels (1), (2), (3). Typical values for the flow rate of the compressed air are between 50 liters / minute and 300 liters / minute.
    The pressure in the supply lines (31), (32), (33) is measured by means of the pressure sensors (54), (55), (56), which have a corresponding measurement signal (Pm1), (Pm2), (Pm3) send to the control device (50).
    The flow in the supply lines (31), (32), (33) is measured by means of the flow sensors (57), (58), (59), which have a corresponding measurement signal (Dm1), (Dm2), (Dm3) send to the control device (50).
    The controllable heating elements (34), (35), (36) are controlled in a separate control circuit to bring the compressed air to a suitable temperature. The actual temperature of the compressed air introduced is measured in each texturing channel (1), (2), (3) by the temperature sensors (60), (61), (62) which have a respective measurement signal (Tm1), (Tm2), ( Tm3) to the control device (50). Each heating element (34), (35), (36) is controlled via a separate control circuit in order to achieve or maintain the desired temperature for the compressed air. To that end, the control device (50) sends control signals (Tr1), (Tr2), (Tr3) to the respective heating elements (34), (35), (36).
    The air has a temperature that is sufficiently high to bring the plastic filaments to a temperature at which the plastic is soft and deformed easily.
    The multifilament yarn (4), (5), (6) is entrained by the hot air in the texturing channels (1), (2), (3). Each texturing channel is also provided with a "stuffer box", mainly consisting of a widening of the texturing channel and a number of openings through which the air can leave the texturing channel (this is not indicated in the figure). As a result, the filaments experience a sudden delay whereby the yarn (4), (5), (6) is compressed into a yarn plug (7), (8), (9) and deforms the filaments of the yarn. This yarn plug (7), (8), (9) is further displaced in the texturing channel (1), (2), (3) and leaves the texturing channel via the exit opening (1b), (2b), (3b).
    The three yarn plugs (7), (8), (9), after exiting, their respective texturing channels (1), (2), (3) are laid side by side on the jacket surface (21) of a rotating cooling drum (20) to drain off to cool and to fix the distortions. The cooling drum is rotated by means of a motor (22) so that a certain circumferential speed is achieved on the cooling drum, preferably between 40 and 100 m per minute. This speed is adjustable and adjustable.
    The crimped yarn is pulled away from the leading ends (7a), (8a), (9a) of the advancing yarn plugs (7), (8), (9) - called the take-off ends - at a faster speed than the said peripheral speed and led away from the surface of the cooling drum (21) to be wound on coils (not shown in the figure).
    The locations (L1), (L2), (L3) of the collection ends (7a), (8a), (9a) are detected by means of a camera (70). The image recordings from this camera (70) are continuously analyzed for this purpose and processed in a non-proposed image processing unit.
    On the basis of these image recordings, it is determined in particular to what extent the location (L1), (L2), (L3) of the removal end (7a), (8a), (9a) of each yarn plug (7), (8) , (9) deviates from a specific target location, and / or to what extent these locations (L1), (L2), (L3) differ from each other.
    More specifically, for example (see Figure 2), the distance (D) between the furthest locations (L1), (L2), (L3) of the removal ends (7a), (8a), (9a) is checked and the control device (50) provided to control one or more parameters based on the detected locations (L1), (L2), (L3) to prevent this intermediate distance (D) from exceeding a predetermined maximum. The control device (50) can be provided in an alternative setting or additionally also to prevent, by controlling one or more parameters, the removal ends (7a), (8a), (9a) of the yarn plugs (7), (8) ), (9) are located outside a predetermined collection zone (Z).
    权利要求:
    Claims (27)
    [1]
    Conclusions
    A method for manufacturing at least one crucified multifilament plastic yarn by applying a texturing process, wherein a stream of heated gaseous medium is introduced into a texturing channel (1), (2), (3), a plurality of plastic filaments (4) , (5), (6) are displaced and deformed by the heated gaseous medium in the texture channel (1), (2), (3), and wherein the deformed filaments are fixed such that a crimped plastic yarn (10), (11) , (12), characterized in that both the temperature and the flow of the gaseous medium are measured, and that the heat supply per unit of time realized by the introduction of the gaseous medium is controlled by adjusting or controlling at least one of the parameters that influence this heat supply.
    [2]
    Method for manufacturing at least one crucified multifilament plastic yarn, according to claim 1, characterized in that in the regulation of the heat supply per unit of time, the heat supply is changed by the flow rate of the gaseous medium and / or the temperature of the heated gaseous medium medium to change or arrange.
    [3]
    Method for manufacturing at least one frizzed multifilament plastic yarn, according to claim 1 or 2, characterized in that the heat supply is controlled per unit time by controlling the flow rate of the flow of gaseous medium to achieve a specific target value when a deviation between the measured value and the target value is determined, and / or by controlling the temperature of the stream of heated gaseous medium to reach a specific target value when a deviation between the measured value and the target value is determined.
    [4]
    Method for manufacturing at least one crimped multifilament plastic yarn, according to claim 3, characterized in that in each texturing process, or only the flow of the flow of gaseous medium is controlled to reach a specific target value, and that this target value is so determined the flow of gaseous medium at a flow rate with this target value and at the measured temperature yields a desired heat supply per unit of time, or only the temperature of the flow of heated gaseous medium is controlled to reach a specific target value, and that this target value is thus it is determined that the flow of gaseous medium at a temperature with this target value and at the measured flow yields a desired heat supply per unit of time.
    [5]
    Method for manufacturing at least one crucified multifilament plastic yarn, according to one of the preceding claims, characterized in that the flow rate is controlled to achieve a specific target value for the flow rate and that the flow rate is changed by the pressure on the supplied gaseous medium to change or arrange.
    [6]
    Method according to one of the preceding claims, characterized in that the plastic filaments (4), (5), (6) are compressed in each texturing channel (1), (2), (3) so that a respective yarn plug (7) , (8), (9) is formed, and that the yarn plugs are moved on a moving cooling surface (21) after leaving the texturing channels (1), (2), (3).
    [7]
    Method for manufacturing at least one frizzed multifilament plastic yarn according to one of the preceding claims, characterized in that the plastic filaments (4), (5), (6) in each texturing channel (1), (2), (3) be compressed to form a respective yarn plug (7), (8), (9), the compressed yarn being added to one end (7b), (8b), (9b) of the yarn plug while being added to the other end (7a), (8a), (9a) from the yarn plug, called the take-off end, is pulled away so that the yarn plug (7), (8), (9) unravels and the yarn (10), (11), (12 ) is drained in a frizzy state, the location (L1), (L2), (L3) of the take-off end (7a), (8a), (9a) of each yarn plug is detected, and in each texturing process based on the detected location (L1), (L2), (L3) one or more parameters are controlled to prevent the locations of the take-off ends of the yarn plugs from being outside a predetermined take-off zone (Z) inden.
    [8]
    Method for manufacturing at least one crimped multifilament plastic yarn according to one of the preceding claims, characterized in that at least two crimped multifilament yarns are manufactured simultaneously by applying a respective texturing process, wherein in each texturing process a number of plastic filaments (4), (5), (6) are introduced through a respective stream of heated gaseous medium into a respective texturing channel (1), (2), (3), in which both the temperature and the flow rate of each stream of gaseous medium are measured, and that for each texturing channel (1), (2), (3) the heat supply per unit of time that is realized by introducing the heated gaseous medium is controlled to minimize the differences between the heat supply in the different texturing channels.
    [9]
    A method for manufacturing at least one crimped multifilament plastic yarn according to claim 8, characterized in that the heat supply per unit time is controlled in the different texturing channels (1), (2), (3) in order to achieve or maintain a common target value.
    [10]
    A method for manufacturing at least one crimped multifilament plastic yarn according to claim 8 or 9, characterized in that the heat supply per unit time in each texturing channel is controlled by controlling the flow rate of the gaseous medium flow to achieve a specific target value and by control the temperature of the stream of heated gaseous medium to reach a specific target value, and that the same target values are used for the different texturing channels.
    [11]
    Method for manufacturing at least one frizzy multifilament plastic yarn according to one of claims 8 to 10, characterized in that the following parameters are measured for each texturing channel (1), (2), (3): - the pressure of the stream of gaseous medium, - the flow of the stream of gaseous medium, and - the temperature of the stream of heated gaseous medium, and that at least the pressure and / or the temperature are controlled to obtain a desired heat supply per unit of time in each texturing channel.
    [12]
    Method for manufacturing at least one frizzed multifilament plastic yarn according to one of claims 8 to 11, characterized in that the plastic filaments (4), (5), (6) in each texturing channel (1), (2), ( 3) be compressed to form a respective yarn plug (7), (8), (9), the compressed yarn being added to one end (7b), (8b), (9b) of the yarn plug while being added to the other end (7a), (8a), (9a) of the yarn plug, called the take-off end, is pulled away, so that the yarn plug unravels and the yarn (10), (11), (12) is discharged in a crimped state, which the locations (L1), (L2), (L3) of the take-off ends (7a), (8a), (9a) of the various yarn plugs are detected, which in each texturing process are based on the detected location (L1), (L2) ), (L3) one or more parameters are controlled to prevent the distance (D) between the farthest away from each other from exceeding a predetermined maximum or to prevent the locations (L1), (L2), (L3) of the take-off ends of the yarn plugs from being outside a predetermined take-off zone (Z).
    [13]
    Method for manufacturing at least one crimped multifilament plastic yarn according to claim 12, characterized in that at least one of the following parameters is controlled in each texturing process on the basis of the detected location (L1), (L2), (L3) of the removal end (7a), (8a), (9a) of the yarn plug formed in that texturing process: the temperature, the flow and the pressure of the gaseous medium.
    [14]
    A method for manufacturing at least one crimped multifilament plastic yarn according to claim 12 or 13, characterized in that the detection of the locations (L1), (L2), (L3) of the removal ends (7a), (8a), (9a ) is done by capacitive detection or by making image recordings during each texturing process on which the take-off ends of the different yarn plugs are visible, with each detection of the locations (L1), (L2), (L3) of the take-off ends (7a), (8a ), (9a) is done by automatic analysis and / or processing of one or more image recordings.
    [15]
    Method according to one of claims 12 to 14, characterized in that the locations (L1), (L2), (L3) of the take-off ends (7a), (8a), (9a) of the different yarn plugs on at least two consecutive times are detected, based on the thus determined changes of these locations, it is determined for each collection end which location is expected at a later time, and that control means are provided to anticipate an expected location outside the predetermined collection zone (Z) by controlling a parameter in the relevant texturing process to keep the take-off end within this take-off zone (Z).
    [16]
    An apparatus for manufacturing at least one frizzy multifilament plastic yarn by using a texturing process, comprising at least one texturing channel (1), (2), (3) and means (30-33) for a flow of heated gaseous medium to each texturing channel wherein each texturing channel comprises (1), (2), (3), - an entrance (1a), (2a), (3a) along which plastic filaments (4), (5), (6) enter the channel (1), (2), (3) can be introduced, - at least one opening through which the heated gaseous medium can be introduced into the texturing channel (1), (2), (3) for heating and filming the filaments in the texturing channel, - means for deforming the filaments, and - an output (1b), (2b), (3b) along which the deformed filaments can leave the texturing channel, the device also comprising means (20-22) for fix filaments of each texturing channel in a deformed state, characterized in that the device for each texturing channel (1), (2), ( 3) also includes a temperature sensor (60), (61), (62) for measuring the temperature of the heated gaseous medium, and a flow sensor (57), (58), (59) for measuring the flow of the supplied gaseous medium measuring medium, and that the device comprises a control device (50) which is provided for controlling the heat supply per unit of time realized by the introduction of the flow of gaseous medium into each texturing channel (1), (2), (3) arrange for.
    [17]
    Device for manufacturing at least one frizzy multifilament plastic yarn according to claim 16, characterized in that the device comprises for each texturing channel, - an adjustable heating device (34), (35), (36) for heating the gaseous medium, said control device (50) is provided in the event of a deviation between a specific target temperature and the measured temperature, a setting of the heating device (34), (35), (36) to change the temperature of the heated gaseous medium to the target temperature and / or - a flow-determining device (51), (52), (53) with which the flow of the supplied flow of gaseous medium can be controlled, said control device (50) being provided for in the event of a deviation between a determined target flow rate and measured flow rate, a setting of the flow rate determining device (51), (52), (53) to bring the flow rate of the gaseous medium flow to the target flow rate, and d the control device (50) is provided to control the heat supply per unit of time by controlling the temperature and / or flow of the gaseous medium.
    [18]
    An apparatus for manufacturing at least one crucified multifilament plastic yarn according to claim 16 or 17, characterized in that said flow-determining device (51), (52), (53) comprises a pressure regulator in cooperation with said regulating device (50) and in that said control device (50) is provided to change the pressure in the gaseous medium flow in order to bring the flow to the target flow.
    [19]
    Device for manufacturing at least one frizzy multifilament plastic yarn according to one of claims 16 to 18, characterized in that the control device (50) is provided to control one of the measured parameters, being flow rate and temperature, in each texturing process to achieve a specific target value, such that the target value for each texturing process is determined such that the flow of gaseous medium at this target value of one parameter and at the measured value of the other parameter in the texturing channel produces a desired heat supply per unit of time.
    [20]
    Device for manufacturing at least one frizzy multifilament plastic yarn according to one of claims 16 to 18, characterized in that the control device (50) is provided for controlling the heat supply per unit of time in each texturing channel (1), (2), (3) ) by controlling the flow rate of the flow of gaseous medium to reach a specific target value and by controlling the temperature of the flow of heated gaseous medium to reach a specific target value.
    [21]
    Device for manufacturing at least one crimped multifilament plastic yarn according to one of claims 16 to 20, characterized in that each texturing channel (1), (2), (3) is provided around a respective yarn plug (7), (8) ), (9) with a detachable end (7a), (8a), (9a), from which the yarn (10), (11), (12) is pulled away to discharge it in a crimped state, and that the device comprises at least one location detecting means (70) for detecting the location of the removal end of each yarn plug.
    [22]
    Device for manufacturing at least one crimped multifilament plastic yarn according to one of claims 16 to 21, characterized in that it comprises at least two texturing channels (1), (2), (3) for manufacturing respective crimped multifilament yarns ( 10), (11), (12), and that the control device (50) is provided for the heat supply per unit of time that is realized by introducing the heated gaseous medium into each texturing channel (1), (2), (3) , to minimize the differences between the heat input in the different channels.
    [23]
    Device for manufacturing at least one frizzy multifilament plastic yarn according to claim 22, characterized in that the control device (50) is provided for controlling the heat supply per unit of time in the different texturing channels (1), (2), (3) to achieve or maintain a common target value.
    [24]
    Device for manufacturing at least one crimped multifilament plastic yarn according to one of claims 22 or 23, characterized in that the texturing channels (1), (2), (3) are provided around respective yarn plugs (7), (8) , (9) with take-off ends (7a), (8a), (9a), from which the yarn (10), (11), (12) is pulled out to discharge it in crimped condition, and the device at least one location detecting means (70) comprising the locations (L1), (L2), (L3) of the take-off ends (7a), (8a), (9a) of the different yarn plugs (7), (8), ( 9) to be automatically detected during the texturing process, and that the control device (50) is provided for in one texturing process, based on the location (L1), (L2), (L3) detected by the location detecting means (70) or control multiple parameters to prevent the distance (D) between the furthest locations from exceeding a predetermined maximum.
    [25]
    Device for manufacturing at least one crimped multifilament plastic yarn according to claim 24, characterized in that at least one location detecting means is provided for capacitive detection of the location (L1), (L2), (L3) of each receiving end (7a) ), (8a), (9a).
    [26]
    Device for manufacturing at least one crimped multifilament plastic yarn according to claims 24 or 25, characterized in that the device comprises at least one location-detecting means (70), an image-recording device which is provided for taking one or more image recordings during each texturing process on which the take-off ends (7a), (8a), (9a) of the different yarn plugs (7), (8), (9) are visible, and an image processing and / or image analysis device provided for the locations of the detecting end-ends by automatic analysis and / or processing of one or more image recordings.
    [27]
    Device for manufacturing at least one crimped multifilament plastic yarn according to one of claims 16 to 26, characterized in that each texturing channel (1), (2), (3) is provided around a respective yarn plug (7), (8) ), (9), and that the device comprises a movable cooling surface (21) which is provided around the yarn plugs (7), (8), (9) after leaving the texturing channels (1), (2), (3) while moving the yarns (10), (11), (12) in the friable state of the yarn plugs (7), (8), (9) located on the cooling surface (21).
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    US15/569,084| US11078606B2|2015-04-24|2016-04-22|Method and device for producing crimped multifilament synthetic yarn|
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