• 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:
    The invention relates to a device for producing plastic profiles with an extruder (1) having an extrusion die (1a). Optimum control of the extrusion line can be achieved by arranging at least one nozzle plate (18a, 18b, 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h) in the area of the end face of the extrusion die (1a) to selectively supply air directed to predetermined areas of the plastic profile (100) or the exit region of the plastic profile (100) on the extrusion line.
    公开号:AT519313A1
    申请号:T50949/2016
    申请日:2016-10-19
    公开日:2018-05-15
    发明作者:Pramberger Siegfried
    申请人:Pramberger Siegfried；
    IPC主号:
    专利说明:

    The invention relates to a device for the production of plastic profiles with an extruder having an extrusion die.
    Plastic profiles are produced in extrusion lines in which an extruder first ejects an initially hot and plastically deformable profile strand, which is then processed in calibration tools to form a plastic profile with precisely defined geometrical properties. The setting of such an extrusion line is very complicated, since a large number of parameters have to be defined for the individual tools. These parameters interact in complex ways to give a product with specific properties. The operation of such extrusion lines requires qualified personnel to minimize scrap. Nevertheless, it often happens that occur due to slightly changed environmental conditions undesirable properties of the plastic profile produced, so that may be produced large quantities of defective plastic profiles, if the need for improved adjustment is not noticed immediately and appropriate corrective measures are not initiated.
    A challenge in operating an extrusion line is to always meet all minimum profile quality and geometry requirements while minimizing the total weight of the plastic profile to avoid unnecessary material usage.
    The object of the present invention is to provide a method which makes it possible to automate an extrusion line largely and thus to make it independent of the constant presence of qualified personnel.
    According to the invention this is achieved in that in the region of the end face of the extrusion nozzle at least one nozzle plate is arranged to selectively direct air to predetermined areas of the plastic profi Is or the exit area of the plastic profi Is on the extrusion line.
    It is essential to the present invention that any deviations in the weight of the plastic profi Is, the wall thickness, the gloss or the like are quickly detected and corrected during the ongoing explosion process that the admission of air through the nozzle plate is changed accordingly. Selective means in this context both temporally and spatially controlled, that is, the air flow during the extrusion process is continuously variable, for different areas of the plastic profile cross section separately.
    It is particularly preferred that the nozzle plate is arranged on the end face of the extrusion die. Thus, the profile strand can be thermally influenced directly at the outlet from the extrusion die. An increased cooling can increase the strength of the still soft profile strand but at the same time also change the resistance in the extrusion tools.
    Alternatively, the nozzle plate may be arranged on the front side of a dry calibration unit.
    A particularly advantageous aspect of the present invention is that a control device is provided which is connected on the one hand with sensors and on the other hand with the nozzle plate, in order to control the admission of air. In this way, an efficient control of the profile quality can be implemented automatically and without intervention of a qualified operator.
    One way of obtaining control signals is that a sensor is designed as a scale, which is provided downstream of a separating device to weigh the separated profile sections. The weighing of the profile sections thus takes place on the tilting table immediately after the saw or guillotine, which typically divides the endless profile strand into 6 m long profile sections. Since the process of weighing is carried out in the period after a first profile section has been deposited on the tilting table and before the next arrives there, the production process is in no way impaired by the measuring process. It is particularly advantageous that the measurement of the weight takes place at the earliest possible time, so that dead times can be minimized.
    In addition or alternatively, it can also be provided that a sensor is designed to determine the wall thickness in individual regions of the plastic profi Is. It is also possible to determine the withdrawal force required to convey the plastic profile through the processing line. Of the
    The caterpillar take-off must exert a pulling force on the profiled strand which is sufficient to overcome the resistances in the calibration tools. Among other things, these resistances depend on the temperature of the extruded profile in the tools and on the geometry of the extruded profile. In this way, information about the conditions in the calibration tool and can be derived practically in real time, which can be taken into account in the control of certain parameters.
    Further measurements may relate to the surface quality, ie gloss or scratch and the color of the KunststoffprofiIs.
    Particularly efficient assembly and ease of modification is achieved when the nozzle plate is magnetically attached to the extrusion line or dry calibration unit. In order to enable a repeatable positioning of the nozzle plate, grooves or projections or the like can on the respective end face. be provided, which ensure a certain position of the nozzle plate.
    A particular advantage of the magnetic fixing is the fact that assembly, disassembly or change in position of the nozzle plate can also be carried out during the operation of the extrusion line, when the distance between the extrusion line and the first dry calibration unit is typically very small. This means that the calibration table does not have to be moved when tampering with the nozzle plate.
    As a result, the present invention will be explained in more detail with reference to the embodiment variants shown in the figures. Show it:
    Fig. 1 shows schematically an extrusion line according to the invention;
    2 shows a detail of a calibration table including dry calibration unit in an oblique view;
    3 shows a detail of an extrusion die;
    4 shows an end view of a dry calibration unit;
    Fig. 5 is an end view of an extrusion die;
    6 shows schematically a cooling device installed in the calibration table; and
    Fig. 7 shows schematically the water flow in the calibration table and the Kalibrierwerkzeugen.
    The extrusion line of FIG. 1 consists of an extruder 1 with an extrusion die la, a calibration table 2 arranged downstream thereof, on which several dry calibration units 3 and several calibration tanks 4 (the calibration tools) are arranged to cool and feed the plastic profile 100 ejected from the extruder 1 calibrate.
    The calibration tanks 4 are movable on the calibration table 2 in the longitudinal direction to allow rapid adaptation to a different number of dry calibration units 3, since it is desirable that the calibration tanks 4 connect directly to the dry calibration units 3.
    Subsequently, the plastic profile 100 enters a caterpillar take-off 5 which provides the necessary tensile forces to pull the plastic profile 100 through the calibration tools. In a measuring station 6, the plastic profile 100 is measured and then separated in a saw 7 to profile sections 101, which are stored on a tilting table 8.
    The extrusion line is controlled by a control unit 10, which is connected via control lines 11, 12 with the individual components of the extrusion line. Schematically, a balance 13 is indicated in the tilting table 8, which determines the weight of each profile section 101 and transmitted to the control unit 10.
    In the same way, the data about the profile geometry and the like are output from the measuring station 6 to the control unit 10. 15 indicates the nature of this data, namely geometric measurements, color, gloss and scratches. In addition, all relevant data of the other components are transmitted in a manner not shown here, such as the withdrawal force applied by the caterpillar take-off 5, measured values of pressure and temperature from the calibration tools, and the like, and above all also identification data with which each tool is unique can be identified.
    During operation of the extrusion line, the control unit 10 not only takes over data and issues control commands in order to optimally carry out the extrusion process, but records are also made in a database in order to gain empirical values for subsequent extrusion processes.
    FIG. 2 shows that the dry calibration units 3 a, 3 b can be set up in a simple manner on the calibration table 2, since only a mechanical connection has to be produced by means of quick-release fasteners 16. All connections are provided on the non-visible support surface on the underside of the dry calibration units 3a, 3b. They interact with connections which are likewise not visible here at the receiving positions of the calibration table 2. There are thus no hoses for connecting the calibration tools 3a, 3b, 4 with the calibration 2 required, which minimizes the risk of confusion or errors.
    It is also possible within the scope of the invention to continue to use existing calibration tools in an extrusion line designed according to the invention. In this case, a bottom plate is fixedly attached to the underside of these tools, which has the necessary connections on its underside and connects via internal connecting lines with other connections on the side. These other connections are then connected via connecting hoses with the typically also laterally mounted connections of conventional calibration tools. The original tool subsequently forms a unit with the base plate and the connecting hoses, which unit is no longer separated even when dismantling and assembling the tool. For the purposes of the present invention, this unit is considered as a calibration tool. Again, there is no risk of confusion, since after initial construction no further manipulation of the connecting hoses more.
    Fig. 3 shows a quick-change system for the extrusion die la, which can be folded away laterally. By means of quick-acting closures, an extremely short cycle time of less than 10 minutes can be achieved when changing the extrusion die la in conjunction with preheating the extrusion die la.
    In Fig. 4, the end face of a dry calibration unit 3 is shown, wherein laterally on both sides of the opening 19 through which the plastic profile 100 passes, which is a nozzle plate 18 a, 18 b is magnetically fixed.
    Several nozzles, not visible here, can be supplied with compressed air via connections 20 in order to selectively cool the plastic profile 100 entering the opening 19. The amount of air is measured to create reproducible conditions. In this way, the wall thickness of the outer regions of the plastic profile 100 can be adjusted individually, and it can the weight of the plastic profile produced with the (meter weight) are precisely controlled.
    A similar solution is shown in Fig. 4, in which on the end face of an extrusion die la eight nozzle plates 21a, 21b, 21c, 21d, 21e, 21f, 21g and 21h are also magnetically mounted. In this case, the nozzle plates 21a and 21e are directed to viewing surfaces of the plastic profile 100, while the nozzle plates 21b, 21c, 21d, 21f and 21h are directed to extremities which always present a challenge in the extrusion process.
    FIG. 6 shows a cooling device arranged in the calibration table 2, which cools the general cooling water, which is made available to the extrusion line from the outside, to a lower temperature of, for example, 5 ° C. to 8 ° C. Via a feed line 24 and a return line 25, a distributor 23 is supplied, are fed via the special cooling circuits in the calibration tools.
    In Fig. 7, the general cooling water supply for the
    Dry calibration units 3a, 3b shown. To the water tank 26, the distributor 23 is supplied with a supply line 29 with general cooling water. In addition, low temperature water is supplied by the refrigerator 22 as shown above. Via a first supply line 26a with a small cross-section, general cooling water is conducted at a first pressure level to specific circuits in the dry calibration units 3a, 3b. About a second
    Supply line 26b with a small cross-section, low-temperature cooling water is led to further circuits. Via a third supply line 26c with a large cross-section, general cooling water is supplied at a further pressure level. Return lines 27, 28 return the used cooling water.
    权利要求:
    Claims (9)
    [1]
    1. An apparatus for producing plastic profiles with an extruder (1) having an extrusion die (la), characterized in that in the region of the end face of the extrusion die (la) at least one nozzle plate (18a, 18b, 21a, 21b, 21c, 21d , 21e, 21f, 21g, 21h) is arranged to selectively direct air to predetermined areas of the plastic profile (100) or the exit area of the plastic profile (100) on the extrusion line.
    [2]
    2. Apparatus according to claim 1, characterized in that the nozzle plate (21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h) on the end face of the extrusion die (la) is arranged.
    [3]
    3. Device according to claim 1, characterized in that the nozzle plate (18a, 18b) on the end face of a dry calibration unit (3, 3a, 3b) is arranged.
    [4]
    4. Device according to one of claims 1 to 3, characterized in that a control device (10) is provided, on the one hand with sensors and on the other hand with the nozzle plate (18a, 18b, 21a, 21b, 21c, 21d, 21e, 21f, 21g , 21h) is connected to control the admission of air.
    [5]
    5. Apparatus according to claim 4, characterized in that a sensor as a scale (13) is formed, which is provided downstream of a separating device (7) to weigh the separated profile sections (101)
    [6]
    6. Device according to one of claims 4 or 5, characterized in that a sensor is adapted to determine the wall thickness in individual areas of the KunststoffprofiIs (100).
    [7]
    7. Device according to one of claims 4 to 6, characterized in that a sensor is adapted to determine the withdrawal force, which is required to convey the plastic profile (100) through the processing line.
    [8]
    8. Device according to one of claims 1 or 7, characterized in that the nozzle plate (18 a, 18 b, 21 a, 21 b, 21 c, 21 d, 21 e, 2 lf, 21 g, 21 h) magnetically on the extrusion die (la) or the dry calibration unit ( 3, 3a, 3b) is attached.
    [9]
    9. Apparatus according to claim 8, characterized in that on the front side grooves, projections or the like. are provided to determine the position of the nozzle plate (18a, 18b, 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h).
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    AT519313B1|2019-01-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0508167A2|1991-03-25|1992-10-14|Gloucester Engineering Co., Inc.|Air ring and method for controlling blown film thickness|
    WO2002070230A1|2001-03-05|2002-09-12|Windmöller & Hölscher Kg|Blown film die for producing tubular film|
    WO2010029144A2|2008-09-15|2010-03-18|Cincinnati Extrusion Gmbh|Device and method for cooling plastic profiles|
    US20140103570A1|2012-10-12|2014-04-17|Manchester Copper Products, Llc|Systems and methods for cooling extruded materials|
    DE202013010264U1|2012-12-05|2014-01-29|Wobbleworks, Inc.|Portable three-dimensional drawing device|EP3825093A1|2019-11-20|2021-05-26|Extrunet GmbH|Extrusion nozzle for producing a plastic component|
    法律状态:
    2021-07-15| REJO| Opposition accepted [patent revoked]|Effective date: 20210601 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50949/2016A|AT519313B1|2016-10-19|2016-10-19|DEVICE FOR PRODUCING PLASTIC PROFILES|ATA50949/2016A| AT519313B1|2016-10-19|2016-10-19|DEVICE FOR PRODUCING PLASTIC PROFILES|
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