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    • 专利摘要:
    the invention relates to an apparatus for producing coated netting of homogenized tobacco material, said coating system comprising: - a coating box adapted to contain a slurry of said homogenized tobacco material, and from which a coated web of said slurry is coated; a first drying section adapted to dry said coated net; - a movable support for receiving the coated web formed by coating said slurry from said coating box and for transporting it to said first drying section; - a cylinder adapted to move said mobile support and adapted to allow heat exchange between said cylinder and said mobile support; and - first temperature control means for cooling said cylinder, so that a temperature difference between a temperature of said movable support in a position where said coated net is received on said support from said lining box, and a temperature of said slurry in said casing is between about 0 degrees Celsius and about 30 degrees Celsius.
    公开号:BR112017010732B1
    申请号:R112017010732-5
    申请日:2015-12-16
    公开日:2022-01-18
    发明作者:Siew Hock Soo；Raffaele Pozzi；Fabio Conti
    申请人:Philip Morris Products S.A.；
    IPC主号:
    专利说明:

    [001] This invention relates to an apparatus for producing a mesh coated with homogenized tobacco material. In particular, the invention relates to an apparatus for producing a web coated with homogenized tobacco material for use in an aerosol generating article, such as, for example, a cigarette or a tobacco-containing product of the "heat without burning" type. ".
    [002] Currently, in the manufacture of tobacco products, in addition to tobacco leaves, homogenized tobacco material is also used. This homogenized tobacco material is normally made from parts of the tobacco plant that are less suitable for the production of cut filler material, such as tobacco stalks or tobacco powder. Typically, tobacco powder is created as a by-product during the manipulation of tobacco leaves during manufacturing.
    [003] The most commonly used forms of homogenized tobacco material are reconstituted tobacco sheet and coated sheet. The process for forming sheets of homogenized tobacco material commonly comprises a step in which tobacco powder and a binder are mixed to form a slurry. The slurry is then used to create a tobacco web, for example, by coating a viscous slurry over a moving metal belt to produce the so-called coated sheet. Alternatively, a slurry with a low viscosity and high water content can be used to create reconstituted tobacco in a process that resembles papermaking. Once prepared, the homogenized tobacco webs can be cut similarly to whole leaf tobacco to produce cut tobacco filler suitable for cigarettes and other smoking articles. A process for making such homogenized tobacco is disclosed, for example, in European Patent EP 0565360.
    [004] In a "non-burning" aerosol generating article, an aerosol forming substrate is heated to a relatively low temperature in order to form an aerosol but prevent combustion of the tobacco material. In addition, the tobacco present in the homogenized tobacco material is typically the only tobacco, or includes the majority of the tobacco present in the homogenized tobacco material of such a "non-burning heating" aerosol generating article. This means that the aerosol composition that is generated by such a "non-burning" aerosol generating article is substantially solely based on the homogenized tobacco material. Therefore, it is important to have good control over the composition of the homogenized tobacco material to control, for example, the taste of the aerosol.
    [005] Due to variations in the physical properties of the slurry, for example, consistency, viscosity, fiber size, particle size, moisture, or the age of the slurry, standard coating methods and apparatus may result in undesirable variations in the application of the slurry. slurry on a support during homogenized tobacco mesh coating. Less ideal coating conditions and apparatus can lead to heterogeneity and defects in the coated web of homogenized tobacco.
    [006] Heterogeneity in the homogenized tobacco web can lead to difficulties in the subsequent handling of the homogenized tobacco web in the production of the aerosol generating article. For example, heterogeneity can lead to network breakdown or even network disruption during fabrication or further processing of the network. This, in turn, can result, for example, in the machine stopping. In addition, a non-homogeneous tobacco web can create an unintended difference in aerosol distribution between aerosol generating articles that are produced from the same homogenized tobacco web.
    [007] Therefore, there is a need for a new apparatus for preparing a homogenized tobacco material, in particular, for use in a heated aerosol generating article of the "non-burning" type that is adapted to the different characteristics of heating and aerosol forming requirements of such a heated aerosol generating article.
    [008] According to a first aspect, the invention relates to an apparatus for producing a net coated with homogenized tobacco material, said apparatus comprising a liner box adapted to contain a slurry of said homogenized tobacco material. and from which a coated web of said slurry may be coated; a first drying section adapted to dry said coated net; a movable support for receiving the coated web formed by coating said slurry from said coating box and transporting it to said first drying section; and a cylinder adapted to move said movable support. According to the invention, the cylinder is adapted to allow heat exchange between said cylinder and said mobile support; and the apparatus further includes first temperature control means for cooling said cylinder such that a temperature difference between a temperature of said movable support at a position where said coated net is received on said support from said jacket, and a temperature of said slurry in said jacket is between about 0 degrees Celsius and about 30 degrees Celsius.
    [009] Homogenized tobacco materials are formed by mixing various ingredients with water until a slurry is obtained. In an additional step, a continuous network of homogenized material is created on a support by coating the slurry onto the support. The resulting homogenized tobacco material is desired to have relatively high tensile strength and good homogeneity.
    [0010] An important slurry parameter that influences the tensile strength and homogeneity of the coated web of homogenized tobacco material is its slurry viscosity, in particular, at the same time as the slurry coating. In addition, the density of the slurry is also important in determining the final quality of the coated web, particularly prior to coating. An appropriate combination of slurry density, viscosity and homogeneity minimizes the number of defects and can increase the tensile strength of the web.
    [0011] Another relevant process in the production of homogenized tobacco material is coated net drying, wherein the moisture level of the homogenized tobacco material changes from slurry moisture to finished coated net moisture, which is much smaller than the initial. This drying process is preferably optimized in order to minimize formation of defects, such as bubbles or clumps, in the coated homogenized tobacco material. In addition, when drying processes too quickly or the coated net is exposed to high temperature gradients, an undesirable crust can form on top of the coated net. The crust is a thin, hardened layer on the top surface of the coated net that prevents moisture in the coated net from escaping from the underside of the crust. When the crust forms, or forms too quickly, it often leads to the appearance of blisters below the crust. Bubbles are a source of undesirable heterogeneity.
    [0012] The slurry comprises a number of different components or ingredients. These components influence the properties of homogenized tobacco material. A first ingredient is a tobacco powder blend, which preferably contains the majority of the tobacco present in the slurry. The tobacco powder blend is the source of most of the tobacco in the homogenized tobacco material and thus provides flavor to the final product, for example, an aerosol that is produced by heating the homogenized tobacco material. A cellulose pulp containing cellulose fibers is preferably added to the slurry in order to increase the tensile strength of the web of tobacco material which acts as a strengthening agent. A binder and aerosol former are also preferably added to enhance the tensile properties of the homogenized sheet and promote aerosol formation. Furthermore, in order to achieve a certain viscosity and ideal humidity for coating a web of homogenized tobacco material, water can be added to the slurry. The slurry is mixed to make it as homogeneous as possible.
    [0013] The slurry is then collected in the slurry, wherein a predefined amount of slurry is preferably maintained, for example a predetermined level of slurry within the slurry. Preferably, the slurry is continuously supplied to the coating box while the slurry is coated onto a moveable support to form a continuous network of homogenized tobacco material.
    [0014] According to the invention, the slurry is coated across a width of a movable support, through an outlet of the casing that is formed between the moving support and a coating sheet. The holder moves along a longitudinal direction to remove the slurry from the lining box. The support may include, for example, a stainless steel movable belt. The support is moved by a cylinder which is adapted to advance the mobile support. The cylinder is additionally adapted to be in thermal contact with the mobile support by the coated net. Preferably, the temperature of the cylinder is regulated so that a desired temperature of the movable support is obtained by means of heat exchange between the movable support and the cylinder. The temperature setting is such that the difference between the temperature of the slurry in the coating box and the temperature of the support is between 0 degrees Celsius and about 30 degrees Celsius. Preferably, the difference between the temperature of the slurry in the jacket box and the temperature of the support is between 0 degrees Celsius and about 15 degrees Celsius. This narrow range of temperature difference avoids a thermal shock in the slurry when the slurry is deposited on the support. A thermal shock can cause the slurry material to expand or contract suddenly. This can cause defects such as inhomogeneities or bubbles. Furthermore, controlling the temperature of the support makes it possible to obtain a uniform temperature distribution within the support itself. Without such active control, the temperature at the sides of the support tends to be lower than the temperature at the center of the support. This can cause heterogeneity in the coated network deposited on the mobile support.
    [0015] The term "homogenized tobacco material" is used throughout the specification to encompass any tobacco material formed by agglomerating particles of tobacco material. Sheets or webs of homogenized tobacco are formed in the present invention by agglomerating particulate tobacco obtained by milling or any other form of grinding, for example, tobacco leaf blade, or tobacco leaf stalks or mixtures thereof.
    [0016] In addition, homogenized tobacco material may comprise an amount of one or more of tobacco powder, tobacco residue and other particulate tobacco by-products formed during the treatment, handling and shipment of tobacco.
    [0017] In the present invention, the slurry is preferably formed by the tobacco blade and the stem of different types of tobacco, which are properly mixed. In this, the term "type of tobacco" refers to one or more varieties of tobacco. In connection with the present invention, these different types of tobacco are distinguished into three main groups of light tobacco, dark tobacco and flavor tobacco. The distinction between these three groups is based on the curing process that tobacco undergoes before it is further processed into a tobacco product.
    [0018] As mentioned above, the slurry should be as homogeneous as possible so that its viscosity is also as uniform as possible and close to an ideal target value for the coating. In order to obtain a uniform viscosity, the entire amount of slurry is preferably mixed before coating.
    [0019] The slurry is then conveyed to the liner box to fill the liner box to preferably a predetermined level. Preferably, the fill level of the slurry in the jacket is kept substantially constant within the jacket. The slurry flows out of the jacketing box from an opening designed in the bottom of the jacketing box, for example under the influence of gravity. Additionally, means for active transport within the casing may be provided, such as impellers or impellers. Preferably, the liner box forms a pressurized envelope. Preferably, control means are provided to allow control over the pressure within the jacket. In such an embodiment, the flow of slurry out of the casing is further controlled by setting and maintaining the internal pressure level within the casing. Preferably, the coating apparatus comprises a mixing device for mixing the slurry within the coating box. The slurry is then distributed over the movable support through the gap that is formed between the coating sheet and the movable support.
    [0020] The moving support is preferably an endless belt, that is, each portion of the moving support that is at some point in time during production, located below the coating box, and transports the slurry to a drying station , then returns to the coating site where the slurry is deposited on the mobile support. The support defines a width that, in general, is greater than or similar to the width of the coated net deposited on the mobile support.
    [0021] In the drying station, preferably, the temperature of the coated net is high, so that the humidity inside the coated net can decrease. Preferably, the moisture of said web of coated tobacco material in the liner - i.e., the moisture of the slurry - is between about 60 percent and about 80 percent. Preferably, the moisture of said coated web at the end of drying is between about 7 percent and about 15 percent of the dry weight of the web of tobacco material. Preferably, the moisture of said homogenized tobacco web at the end of drying is between about 8 percent and about 12 percent of the dry weight of the homogenized tobacco web. The slurry moisture at the coating and at the end of the drying process is another important parameter to control how it influences the homogeneity of the homogenized tobacco network and the production capacity of the homogenized tobacco network in subsequent production steps.
    [0022] It has been found that the ideal slurry moisture level is between about 60 percent and about 80 percent. Below this preferred range, the density of the slurry in the coating is such that it often causes defects in the coated web. In addition, a moisture level outside this range can result in reduced tensile strength of the coated web which can complicate efficient handling of the web of homogenized tobacco material in subsequent processing steps. Therefore, the excess moisture that needs to be removed during the drying step of the coated net is relatively high. Moisture removal is preferably performed by exposure to a stream of drying air, wherein the drying air has a temperature greater than the temperature of the coated web. Increasing the temperature around the coated net causes the temperature of the mobile support to also increase. Due to heat transfer with the environment, the temperature at the edges of the movable support, limits that include the side edges of the movable support, tends to be lower than in the rest of the movable support. In fact, it has been found that the temperature at the edges of the support, without correction, can be up to about 5 degrees Celsius to about 15 degrees Celsius lower than the temperature in the middle of a movable support. Therefore, when the mobile support from the drying station returns to the coating box to collect additional slurry, the mobile support may have a temperature that exceeds the temperature of the slurry. The slurry inside the jacket is preferably kept at approximately room temperature, i.e. between about 15 degrees Celsius and about 30 degrees Celsius. Furthermore, without active correction, the moving support can often show an inhomogeneous temperature distribution along its width, such that the moving support tends to have a lower temperature at the edges of the moving support and a higher temperature at the center. of mobile support.
    [0023] The coating of the slurry on the mobile support that has a non-uniform temperature distribution, as described above, can result in the appearance of defects in the coated web. Slurry, which is subjected to a high non-uniform temperature gradient, may form uneven thickness on the mobile support. Defects such as bubbles can occur under these conditions. A greater thickness in the center, over the movable support, may develop. Furthermore, the high temperature difference between the support and the slurry can trigger the formation of a thin dry layer on top of the coated web. This dry layer or crust, which is more rigid and less permeable to moisture than the underlying coated web, inhibits the drying of the material that forms the coated web below this dry layer. This inhibition is due to the moisture retention effect of the crust as water cannot properly evaporate through the crust. Therefore, the coated net cannot dry optimally. This can lead to waste. The dried layer is additionally prone to cracking and thus defects in the coated web. Cracks in the crust can lead to an unintentional decrease in the tensile strength of the web, increasing the likelihood that the web of homogenized tobacco material will break, for example, during subsequent manufacturing steps.
    [0024] According to the invention, in order to obtain a homogeneous coated net, in which the formation of defects is minimized, a slurry with the preferred density and humidity according to the process parameters is coated through the coating. This slurry is coated onto the mobile support which is maintained at a predetermined temperature by means of the same cylinder used to move the mobile support. The cylinder is maintained at a temperature such that the temperature difference between the temperature of the mobile support at the slurry deposition site and the temperature of the slurry in the jacket box is between about 0 degrees Celsius and about 30 degrees Celsius through the first means of temperature control. Preferably, the temperature difference is between 0 degrees Celsius and about 15 degrees Celsius, more preferably between 0 degrees Celsius and about 7 degrees Celsius. A small temperature difference reduces the appearance of defects. In addition, the "crust" or dry layer on top of the coated net, caused by an excess temperature gradient, forms more slowly or does not form at all. Preferably, the temperature of the movable support in the jacket is between about 15 degrees Celsius and about 50 degrees Celsius in the slurry deposition position. Preferably, the temperature of the slurry in the jacket is between about 15 degrees Celsius and about 35 degrees Celsius, more preferably, between about 20 degrees Celsius and about 28 degrees Celsius.
    [0025] Furthermore, an active temperature control of the support by means of the cylinder temperature regulation allows a uniform temperature distribution along the entire width of the movable support, due to the heat exchange between the cylinder and the support. The temperature across the entire width is substantially the same, with a tolerance of between about 2 degrees Celsius and about 15 degrees Celsius. Preferably, the slurry coated on the mobile support is subjected to a uniform temperature. This makes it possible to reduce the risk of heterogeneity forming in the final product.
    [0026] According to a preferred embodiment, the temperature of the cylinder and thus, in turn, of the mobile support is regulated by means of a cooling water distributor. Preferably, water is used to cool the cylinder, as the temperature of the support is, in general, higher than the desired temperature in the coating, due to the fact that the support returns from the drying section, where the support and the coated net are heated to remove moisture from the coated net. Water is a good and economical way to keep the temperature of an object, in this case, the cylinder, controlled within a certain range, due to the availability and high thermal capacity of water.
    [0027] Advantageously, the mobile support includes an endless stainless steel conveyor belt. Stainless steel is a material that allows for easy heat transfer, as it is a good conductor of heat. At the same time, a stainless steel belt reduces the risk of the homogenized tobacco material being firmly attached to the support and thus allows for complete and continuous removal of the homogenized tobacco coated web after the first drying section. During the coated net production process, after the coated net has been at least partially dried, the coated net is removed from the mobile support in order to be further processed. The homogenized tobacco coated web is then further dried, cooled and then wound into spools. The endless mobile support returns to the casing box location so that an additional slurry can be coated onto the mobile support. Removal of the coated net from the support preferably takes place by means of a blade called a scraper blade. In case the coated net is firmly "glued" on the support, the action of the scraper blade can cause the coated net to break and the machine to stop. Therefore, it is preferred that removal of the coated net from the support is as easy as possible, and the use of stainless steel as the material for the support has been found to be a preferred solution. In addition, stainless steel can be machined to the tight tolerances required for lining the mesh of homogenized tobacco material. This makes stainless steel an economical material as a movable support.
    [0028] In a preferred embodiment, the apparatus comprises second temperature control means in said first drying section. Furthermore, the movable support defines a first and a second opposing surface, said slurry being coated on the first surface. The second temperature control means comprises a steam generator for expelling steam towards the second surface of the movable support. Drying of the coated net is preferably slow and under continuous control of the temperature and humidity of the coating net. Advantageously this minimizes the appearance of defects and heterogeneity in the mesh coated with homogenized tobacco material. Drying of the coated net takes place in a first drying section. Preferably more than one drying section is present. Preferably, each of the drying sections is independently controlled, so that in each drying section, process parameters can be independently adjusted from other sections. Preferably, the first drying section includes second temperature control means which, in turn, include a steam generator adapted to expel steam towards the second surface of the support, i.e. the surface opposite the surface of the movable support over the which the coated network is formed. In this way, the temperature on the second surface can be kept substantially constant. Advantageously, the flow rate of the expelled steam can be measured and regulated. Preferably, superheated steam is used to reduce the moisture of the coated net.
    [0029] Furthermore, said second temperature control means may comprise, in said first drying section, a drying air generator for expelling drying air towards said surface. The provision of a drying air generator in the first drying section, and preferably also in all other sections if more than one drying section is present, makes it possible to modify both the flow rate and the temperature of the drying air directed to the the coated net in order to optimize the process for the parameters of the coated net itself. In addition, a continuous feedback control is preferably present, so that the flow rate or temperature, or both, of the drying air expelled from the drying air generator can be modified, depending on the temperature and humidity value of the unit. coated net in the first drying section.
    [0030] Preferably, the free surface temperature of the coated net, which is the surface of the coated net that is not in contact with the support, has a value in the first drying section between about 20 degrees Celsius and about 99 degrees Celsius. Preferably, the steam flow rate in the first drying section is between about 80 kg/h and about 300 kg/h and the drying air temperature is preferably between about 100 degrees Celsius and about 140 degrees Celsius.
    [0031] Preferably, the moisture of said coated web exhibiting said first section is between about 15 percent and about 25 percent.
    [0032] More preferably, said coated web formed on said movable support defines a central portion and two side portions, said side portions including each edge of said coated web, and wherein said drying air generator in said first section The drying air stream is configured such that an uneven drying air stream is expelled towards said coated screen, said drying air stream having a higher flow rate or higher temperature, or both, in a region including the said central portion of said coated net than in a region including said side portions of said coated net. As already mentioned, the humidity or temperature, or both, on the sides of the coated net is, in general, lower than the humidity and temperature in the center of the coated net, because both heat exchange and air convection are intensified. on the sides of the coated net. In order to obtain a uniform coated net with substantially the same level of humidity or temperature, or both, conditions that can reduce the number of defects in the final products, a inhomogeneous drying air flow distribution or an inhomogeneous temperature distribution of drying air, or both, are generated.
    [0033] Advantageously, the coating apparatus comprises a control unit adapted to receive a signal sent by one or more of the following sensors: a humidity sensor adapted to determine a moisture value of said coated net in said first drying section ; a moisture sensor adapted to determine the moisture value of said coated net at the outlet of said first drying section; a thickness sensor adapted to determine the thickness or variations in thickness of said coated web prior to, within or at the exit of said first drying section; a temperature sensor adapted to determine the temperature of said coated net in said first drying section; a temperature sensor adapted to determine the temperature of said slurry in said liner box; a temperature sensor adapted to determine the temperature of said movable support in the jacket; a flow rate sensor for determining the flow rate of said slurry in said casing. The formation of the coated net is a delicate process that determines the quality of the final product. Various parameters can be controlled to minimize the risk of a rejection of the homogenized tobacco web obtained when coating the slurry. For example, due to defects or a low tensile strength, out of specification material could be formed. In particular, these process parameters are - among others - the temperature, humidity, residence time and viscosity of the slurry. In addition, the temperature and humidity of the coated net are relevant parameters to obtain an appropriate final humidity. It is known that viscosity is, in fact, a function of the temperature, humidity and residence time of the slurry. Therefore, preferably at least one of the viscosity, temperature and moisture content of the slurry is monitored with appropriate sensors, as well as at least one of the moisture, temperature, thickness of the coated web. Preferably, the sensor signals are used with a feedback loop for online signal processing and control to keep the parameters within a set of predetermined ranges. For example, process control can be influenced by appropriate process parameter changes, such as the amount of cooling, the temperature, the speed of the moving support, the amount of water introduced into the slurry, the amount of other compounds that form the slurry, drying air temperature or drying air flow rate at the drying station and combinations of the above mentioned process parameter changes and others. Preferably, these parameters are verified by means of sensors inside the first drying section or at the exit thereof, or both. The outlet of the drying section represents a location outside the first drying section and in the vicinity of it in the direction of movement of the mobile support.
    [0034] More preferably, said control unit is adapted to command one or more of: a pump to change the flow rate of said slurry in said jacket; first temperature means for modifying the temperature of said cylinder; second temperature means for modifying the temperature of said drying air in said first drying section, or for modifying the flow rate of said drying air in said first drying section, or for modifying the temperature distribution or the distributing drying air flow rate, or both, of said drying air in said first drying section, or for modifying the flow rate of the steam; jacket temperature means for modifying the temperature in said jacketing box to change the temperature of said slurry; in order to change its operating conditions depending on the signal received by said one or more sensors. Preferably, one or more feedback loops are present in the apparatus of the invention. The presence of a heterogeneity in the thickness or moisture of the mesh coated with homogenized tobacco material, which can be reported by the sensor(s), implicitly indicates the presence of non-ideal coating conditions. These non-ideal coating conditions can be due to various factors such as the density of the slurry outside a preferred range, a moisture level in the slurry outside of a preferred moisture range and others, an incorrect drying air temperature. in the first drying section, an incorrect drying air flow rate in the drying section, an incorrect distribution of temperature or drying air flow rate in the drying section, an incorrect temperature of the movable support in the jacket box, and others. Therefore, advantageously, a plurality of sensors are used in order to obtain parameter values that play a role in the coating and drying process. These values can then, in turn, be adjusted with return cycles, for example when coating or drying conditions would cause coated net production to fall outside of desired specifications. The appearance of defects or non-uniformities, or the change of a parameter outside a predefined standard range is detected by one or more sensors and a corresponding signal is sent to the central control unit. The central control unit can operate or command an actuator, or motor or temperature control means in order to change the deviating process parameter or to modify one or more additional different parameters to correct the detected problem.
    [0035] The preferred return cycle is, for example, measuring the moisture of the coated net in the first drying section or at the output of the first drying section, and, depending on the value of said moisture, sending a control signal to said drying air generator in order to change a temperature of said drying air or a flow rate of said drying air, or both, depending on said humidity value.
    [0036] Advantageously, the coating apparatus comprises a scraper blade adapted to remove said coated net from said mobile support at the exit of said first drying section. The movable support at the outlet of the first drying section is rotating around a cylinder system towards the coating box so that additional slurry can be continuously coated. The moisture content of the coated net at the end of the first drying section is low enough to allow you to remove the coated net from the support and continue drying the coated net on another support.
    [0037] In a preferred embodiment, the coating apparatus comprises a second drying section with third independently controlled temperature control means adapted to control a temperature, or a flow rate, or a temperature distribution, or a temperature distribution. flow rate or any combination of the above drying air options in said second drying section. Drying is very important to obtain a quality final product within the specification provided. In particular, drying of the coated web is preferably slow and without relatively high temperature differences. Therefore, it is preferred that the first drying section is followed by a second drying section. Preferably, the coated web is removed from the movable support of the first drying section by the scraper blade and is placed on a second movable support which passes through the second drying section. Advantageously, the second movable support is a mesh. A mesh support allows free access of a drying means to the second surface of the mesh coated with homogenized tobacco that was previously in contact with the first movable support. Preferably, the second drying section is independently controlled from the first drying section, so that, for example, the drying air temperature or the drying air flow rate, or both, can be adjusted accordingly. independently. In one embodiment, the second drying section includes third temperature control means comprising drying air generator for expelling drying air towards both the first and second surfaces of the second movable support. In the second drying section, therefore, no steam is produced. Advantageously, the temperature of the air in the second drying section is lower than the temperature of the air in the first drying section. The temperature of the drying air in the second drying section is preferably between about 75 degrees Celsius and about 105 degrees Celsius, both towards the first and second surfaces of the second movable support. Said first and second drying stages are preferably arranged in series one after the other, said first stage upstream of said second stage in a direction of movement of said coated web.
    [0038] In one embodiment, said first drying section is divided into a plurality of first drying stages, the drying air temperature, the flow rate, the temperature distribution and the air flow rate distribution of drying being controlled independently in each of the first and second drying stages. In order to decrease the moisture of the coated net in stages, moisture is gently released. Preferably, the first drying section does not have a constant temperature of drying air, or a constant flow rate of either drying air or steam through the entire length of the drying section. In addition, the temperature and flow rate distribution can also be varied between the stages of the first dryer. In this way, moisture can be removed from the coated net in a very controlled manner without subjecting the coated net to excessive temperature or humidity differences. Additional drying sections can be provided as needed.
    [0039] Advantageously, the coating apparatus additionally comprises a winding section for winding said coated net on a spool; and a cooling section downstream of said first drying section and upstream of said winding section. As mentioned, in order to properly dry the coated net, the drying is as homogeneous as possible, as a result of the relatively "slow" speed. At the end of the drying process, carried out by means of the first and second drying sections, the coated net is preferably wound up in order to form one or more coils. Prior to winding, preferably, the coated web exiting the second drying section is cooled to near room temperature, for example, at a temperature between about 15 degrees Celsius and about 30 degrees Celsius by the fourth temperature control means. Cooling can, for example, be carried out by means of a stream of cooling air. The cooling air stream can be unequally directed across the entire net, for example to compensate for a non-uniform temperature distribution of the coated net over its entire width. The reels are then moved to a storage location or to a cutting section where the coated net is cut into a smaller portion.
    [0040] Additional advantages of the invention will become apparent from the detailed description of these, without limiting reference to the attached drawings:
    [0041] Figure 1 is a schematic side view of an apparatus for producing a web of homogenized tobacco according to the invention;
    [0042] Figure 2 is a schematic side view in section of a portion of the apparatus of Figure 1;
    [0043] Figure 3 is a schematic side view of a detail of the portion of the apparatus of Figure 2;
    [0044] Figure 4 is a more detailed side view of the portion of the apparatus of Figure 2;
    [0045] Figure 5 is a flowchart of a method of producing a web of homogenized tobacco using the apparatus of the invention.
    [0046] With initial reference to Figures 1 and 2, an apparatus for producing a web of homogenized tobacco material, in accordance with the present invention, is shown and indicated with the reference numeral 1.
    [0047] The apparatus 1 for producing a web of homogenized tobacco material includes a coating apparatus 2 and, in addition, an additional drying apparatus 3 positioned downstream of the coating apparatus 2 in the direction of movement of the web of material of homogenized tobacco and a rolling station 10 downstream of the drying apparatus 3.
    [0048] The coating apparatus 2 comprises a coating box 4 into which the slurry for forming the network of homogenized tobacco material is introduced, a pump 5, a scraper blade 6 and a first movable support 7. cladding 4 can have any geometric shape, and in the embodiment shown is substantially a prism. The jacket temperature can be varied to modify the slurry temperature, if necessary, during the coating process, by means of a jacket control means (not shown in the accompanying drawings). The coating box 4 has an opening 43 in correspondence with its bottom and the opening extends over a width of the coating box, so that the slurry can be coated from the coating box onto the movable support 7. Slurry from buffer tanks (not shown in the drawings) is transferred via the pump 5 into the jacket box 4. Preferably, the pump 5 comprises a flow rate control (also not visible in the drawings) to control the amount of slurry introduced into the jacket box 4. The pump 5 is advantageously designed to ensure that the slurry transfer is sometimes kept to the minimum necessary.
    [0049] Further, with reference to Figure 3, the coating apparatus 2 includes the scraper blade 6 attached to the coating box 4 for coating the slurry. The scraper blade 6 has one main dimension, which is its width, and is attached to the liner box 4 at or within the vicinity of its opening 43 at the bottom. Preferably, the longitudinal width of the scraper blade 6 is between about 40 cm and about 300 cm, depending on the desired width of the slurry coated web. Preferably, such width is adjustable, for example, by means of suitable width adjustment means (not visible in the drawings), so that the width of the blade or active volume of the lining box can be adjusted to the width of the net. to be coated. The active casing volume is the casing volume that is actually filled with slurry.
    [0050] The lining blade 6 is connected to the lining box 4, preferably by means of an adjustable plate (not visible in the drawings), which allows precise control of the position of the lining blade 6 to adjust a gap between the blade 6 and support 7. Blade 6 can be moved to vary the size of the gap by means of actuators such as actuator 210 visible in figure 1.
    [0051] The coating box 4 and the coating sheet 6 are mounted above a cylinder 8 that rotates the movable support 7. The gap is present between the coating sheet 6 and the movable support 7, whose dimensions determine - between others - the thickness of the mesh coated with homogenized tobacco material.
    [0052] The coating apparatus 2 also comprises the mobile support 7, on which the slurry is coated to form the network of homogenized tobacco material. The mobile support 7 comprises, for example, a continuous endless stainless steel belt 7 which is at least partially arranged around a cylinder assembly. The cylinder assembly includes a master cylinder 8 located below the jacket 4. The master cylinder 8 advances the mobile support 7 by rotating the master cylinder 8. Preferably, the jacket box 4 is mounted on top of the master cylinder 8 Preferably, tolerances above the mounting position are very tight, for example within about 0.01 mm. For example, the movable support cylinder 8 has a tolerance of below about 0.01 mm in concentricity and below about 0.10 mm across its diameter. Preferably, the mobile support 7 has a tolerance of difference in height or thickness below about 0.01 mm.
    [0053] Preferably, the cylinder 8 includes a first temperature control device 80, schematically represented by a box in figures 2, 3 and 4. The main cylinder 8 of the support 7, where the casing box 4 is located, is preferably maintained at a constant temperature to minimize any changes to the slurry by the first temperature control device 80. The first temperature control device 80 includes a water distributor (not shown in the drawings) so that the cylinder 8 is cooled. or heated by means of water. For example, the first temperature control device 80 recirculates process water which is brought into contact with the mobile support 7 and the cylinder 8 on the return side. Cylinder 8 is in heat exchange with support 7, in this case, due to the two being in contact. Preferably, the first temperature control device 80 controls the temperature of the cylinder 8, so that the difference between the temperature of the support 7 at the place where the slurry is deposited on the support, i.e. in the coating box 4 substantially below opening 43, and the temperature of the slurry is between about 15 degrees Celsius and about 35 degrees Celsius. However, it may be desired that cylinder 8 has a varying temperature profile throughout cylinder 8. Preferably, such an uneven temperature profile remains substantially constant over time during production of the web of homogenized tobacco material. For example, the cylinder includes a cylinder cover, the central part of which can be maintained at a temperature between about 0.5 degrees Celsius and about 10 degrees Celsius lower than the rest of the cylinder cover 8. This variation is implemented so that the temperature of the movable support 7 is constant below the opening 43: the support 7 can reach the cylinder 8 with a non-homogeneous temperature distribution, and a corresponding non-homogeneous temperature distribution of cylinder 8 in the opposite direction due to the exchange The heat exchanger to modify the temperature distribution in the mobile support is modified so that the slurry, when coated in the opening 43, is subjected to a uniform temperature. The temperature of the support 7 is substantially similar to the temperature of the slurry present in the jacket 4.
    [0054] Furthermore, again referring to Figure 2, the coating apparatus 2 includes a plurality of sensors. A first sensor 30, a level sensor, is adapted to control the height 41 of the slurry within the lining box 4. This sensor 30 preferably measures a distance 42 between the sensor itself and the surface of the slurry in the lining box 4. The height 41 of the slurry is then derived from the known distance between the sensor 30 and the bottom of the casing 4. Furthermore, preferably, an additional sensor 32 is arranged above the movable support 7 to measure the weight per square centimeter of the slurry. layer of homogenized tobacco on the mobile support 7. The sensor 32 can be, for example, a nucleonic measuring head. Additional sensors are also preferably present, such as a sensor 31 for locating and determining the positions of defects in the homogenized tobacco coated web, a sensor for determining the moisture of the slurry and coated sheet in the coating, and a temperature sensor. to determine the temperature of the slurry in the jacket 4 (all sensors other than the numbered ones are not shown in the drawings).
    [0055] Preferably, all sensors send signals regarding their respective parameters to be measured (eg temperature, humidity, slurry level, presence and location of defects) to a central control unit 40. The control unit hub 40 is preferably electrically connected to one, some or all of the pump 5, the adjustable plate or additional circuitry and actuators in the coating apparatus 2 or a slurry apparatus (not visible). In the event that the coated web reveals defects, or heterogeneity, or the characteristics of the coated web that are outside a predefined range, the central control unit 40 can indicate changes in process parameters and thus influence the slurry characteristics or parameters. of the coating. These process parameters can be, for example, the size of the gap between the coating sheet 6 and the support 7 or the amount of slurry in the coating box. Furthermore, a control of the speed of cylinder 8, and thus of support 7, can also be implemented.
    [0056] As shown in Figure 4, the drying apparatus 3 includes a first drying section 21 and a second drying section 22, separated from each other and in series, with the first drying section arranged before the second drying section in the direction of movement of the coated net. Each of the first and second drying sections 21, 22 is preferably subdivided into a plurality of individual drying zones. The first and second drying sections 21, 22 include a second temperature control device 23 and a third temperature control device 24. The second temperature control device 23 includes a steam generator 25, located below the movable support 7 for expel steam, preferably superheated steam, towards the bottom of the mobile support 7. In addition, the second temperature control device 23 includes a drying air generator 26 for expelling drying air towards the coated screen positioned over the support 7 from above. The flow rate of both steam and drying air is controllable and changeable. The temperature of the drying air can also be modified. Furthermore, preferably, each drying zone of the first drying section 21 preferably includes steam heating on the bottom side of the support and heated air above the movable support 7, and preferably also adjustable exhaust air control. The temperature and flow rate in each zone are preferably independently controlled. Preferably, the flow rate of the steam expelled by the steam generator 25 is between about 80 kg/h and about 300 kg/h, and the temperature of the drying air is preferably between about 100 degrees Celsius and about 140 degrees Celsius. degrees Celsius.
    [0057] Preferably, between the first and second drying sections 21, 22, a scraper blade 48 is located to remove the coated net from the first movable support 7 at the exit of the first drying section 21. The coated net from the The first mobile support 7 is placed on a second mobile support 70. The first drying section 21 additionally comprises, at its outlet, a moisture sensor 41 and, preferably, also a thickness sensor 42 for measuring the moisture content and, optionally also the thickness of the coated net. The values measured by these sensors are sent to the control unit 40, so that, in the event that these values do not fall within the defined preferred ranges, the steam flow rate, or the drying air flow rate, or the temperature drying air, combination of the above or others can be performed in order to have a return control. Alternatively or additionally, the flow distribution of steam or drying air or the temperature distribution of drying air can be modified. Alternatively, the control unit 40 can change different parameters, such as the jacket temperature, the slurry viscosity or other process parameters.
    [0058] The second movable support 70, after the scraper blade 48, passes through the second drying section 22. Preferably, the second drying section 22 also comprises a plurality of drying stages as the first drying section. Preferably, the number of stages in the second drying section 22 is less than the number of stages in the first drying section 21. The third temperature control device 24 includes first and second drying air generators 27, 28 for expelling air. to the bottom of the mobile support 70 and towards the coated net positioned on the support 70, respectively. The flow rate of drying air streams from both above and below is controllable and changeable. The temperature of the drying air can also be modified. Furthermore, preferably, each drying zone in the second drying section 22 independently controlled the temperature and flow rate of the drying air, as well as its temperature and flow rate distribution. Preferably, the temperature of the drying air in the second drying section 22 is between about 75 degrees Celsius and about 105 degrees Celsius.
    [0059] At the outlet of the second drying section 22, a cooling section 90 is preferably present. The second movable support 70 moves the coated screen from the second drying section 22 to the cooling section 90, where the screen temperature coated net is reduced before winding the coated net into spools. The cooling section 90 includes a fourth temperature control device 91 which includes a cooling air generator 92 for venting cooling air towards the liner. The purpose of the cooling section is primarily to reduce the temperature of the coated net to facilitate net winding of the homogenized tobacco material.
    [0060] At the outlet of the cooling section 90, the apparatus 1 includes one or more sensors 61, 62 for measuring the moisture of the coated net and its thickness. The moisture and thickness value(s) are preferably sent to control unit 40 and suitable feedback controls can be made operative. For example, the temperature or flow rate of the cooling air or drying air can be changed within the second drying section 22 or cooling section 90. In addition, the parameters of slurry preparation and coating can be changed by appropriate algorithms and feedback loops.
    [0061] At the end, a winding section 10 is provided, where the coated net is wound onto coils.
    [0062] Now, with reference to figure 5, the operation of the apparatus 1 which includes the coating apparatus 2, and the drying apparatus 3 is as follows. A slurry, preferably formed by combining and mixing tobacco powder and other ingredients, is transferred from a holding tank (not shown) using, for example, in-line mixers (also not shown) to the coating apparatus 2 inside the coating box 4. Step 100 of coating the slurry in a net of uniform and homogeneous film thickness is performed on the moving support 7, for example the stainless steel belt 7. The coating step 100 includes transferring the slurry from the mixing tank to the jacket 4. In addition, the coating step 100 preferably includes monitoring the slurry level in the jacket box 4, the moisture of the slurry inside the jacket box 4, the slurry temperature and slurry density by means of suitable sensors, such as sensor 30.
    [0063] The coating is carried out by means of the coating blade 6 that forms a gap with the movable support 7. The dimensions of the gap can also be controlled by feedback. The web thickness of homogenized tobacco material and the nucleon meter controlled grammage immediately after coating are continuously monitored and feedback controlled using a slurry measuring device.
    [0064] In addition, the coated netting undergoes a first drying step 101 by means of the drying apparatus 3. The first drying stage preferably includes an even and gentle drying of the coated net in a stainless steel belt dryer without -end with individually controllable zones. Preferably, the drying step comprises monitoring the temperature of the coated sheet in each drying zone to ensure a smooth drying profile in each drying zone and heating the support on which the homogenized coated sheet is formed. Preferably, the drying profile is a TLC drying profile. During the first drying step 101, a temperature monitoring step 102 of the coated screen temperature in each drying zone to ensure a smooth drying profile in each drying zone is preferably performed. The coated net is dried in the first drying stage on the steel belt 7 with steam crucible heating from the bottom and top air drying. Each drying zone in the first drying section is equipped with steam flow and pressure control so that air temperature and air flow are fully adjustable to provide the desired drying profile and ensure product residence time is respected. . Preferably, the monitoring step 102 is performed to also measure the moisture content and the number of defects present in the dry web at the end of the first drying stage, as well as the thickness of the coated web.
    [0065] Preferably, at the end of the coating step 100 and the first drying step 101, the homogenized tobacco web is removed from the support 7. Treatment 103 of the coated web after the first drying step at the right moisture content is preferably performed . Preferably, the coated web undergoes a second drying step 104 to further remove moisture content from the coated web to achieve a target moisture. Preferably, in this second drying step 104, the coated net is placed on a strand such that moisture can be easily removed from both surfaces of the net. After drying step 104, a cooling step 105 is performed and then the coated net is preferably wound onto one or more spools in a winding step 106, for example, to form a single main spool. This main coil can then be used to run the production of smaller coils by rolling. The smaller coil can then be used to produce an aerosol generating article (not shown).
    权利要求:
    Claims (15)
    [0001]
    1. Apparatus (1) for producing coated netting of homogenized tobacco material, said system comprising: • a casing box (4) adapted to contain a slurry of said homogenized tobacco material, and from which a coated web of said slurry may be coated; • a first drying section (21) adapted to dry said coated net; • a movable support (7) for receiving the coated web formed by coating said slurry from said coating box and for transporting it to said first drying section; characterized in that it further comprises: • a cylinder (8) adapted to move said mobile support (7) and adapted to allow heat exchange between said cylinder and said mobile support; and • first temperature control means (80) for cooling said cylinder (8), so that a temperature difference between a temperature of said movable support (7) in a position where said coated net is received on said support (7) from said jacket (4), and a temperature of said slurry in said jacket (4) is between 0 degrees Celsius and about 30 degrees Celsius.
    [0002]
    2. Apparatus according to claim 1, characterized in that said temperature control means (80) comprise a water distributor for cooling said cylinder (8) with water.
    [0003]
    3. Apparatus, according to claim 1 or 2, characterized in that said mobile support (7) includes an endless conveyor belt made of stainless steel.
    [0004]
    Apparatus according to any one of the preceding claims, characterized in that said first temperature control means (80) are able to cool said cylinder (8), so that a temperature of said movable support (7) ), in a position where said coated net is received on said mobile support (7), is comprised between about 15 degrees Celsius and about 50 degrees Celsius.
    [0005]
    5. Apparatus according to any one of the preceding claims, characterized in that it comprises second temperature control means (23) in said first drying section (21), and in that said mobile support (7) defines a first and second opposing surface, said slurry being coated onto said first surface, and in that said second temperature control means comprises a steam generator for expelling steam towards said second surface.
    [0006]
    6. Apparatus according to any one of the preceding claims, characterized in that it comprises second temperature control means (23) in said first drying section (21), and in that said mobile support (7) defines a first and a second opposing surface, said slurry being coated onto said first surface, and said second temperature control means (23) comprises a drying air generator (26) adapted to expel drying air towards to said first surface.
    [0007]
    7. Apparatus according to claim 6, characterized in that said coated net on said movable support (7) defines a central portion and two side portions, said side portions including each edge of said coated net, and by fact that said drying air generator (26) in said first drying section (21) is so configured so that an uneven drying air stream is expelled towards said coated screen, said air stream having a higher flow rate or higher temperature, or both, in a region that includes said central portion of said coated mesh than in a region that includes said side portions of said coated mesh.
    [0008]
    8. Apparatus according to any one of the preceding claims, characterized in that it comprises a control unit (40) adapted to receive a signal sent by one or more of the following sensors (30, 31, 32, 41, 42 , 61, 62): • a moisture sensor adapted to determine a moisture value of said coated net in said first drying section; • a moisture sensor adapted to determine the moisture value of said coated net at the outlet of said first drying section; • a thickness sensor adapted to determine the thickness or variations in thickness of said coated net before, within or at the exit of said first drying section; • a temperature sensor adapted to determine the temperature of said coated net in said first drying section; • a temperature sensor adapted to determine the temperature of said slurry in said liner box; • a temperature sensor adapted to determine the temperature of said movable support in the lining box; • a flow rate sensor for determining the flow rate of said slurry in said casing.
    [0009]
    9. Apparatus according to claim 8, characterized in that said control unit (40) is adapted to command one or more: • a pump (5) to change the flow rate of said slurry in said slurry coating box (4); • first temperature control means (80) for modifying the temperature of said cylinder (8); • second temperature control means (23) for modifying the temperature of said drying air in said first drying section (21), or for modifying the flow rate of said drying air in said first drying section (21) , or to modify the temperature distribution, or the drying air flow rate distribution or both of said drying air in said first drying section (21), or to modify the flow rate of said steam; • jacket temperature means for modifying the temperature in said jacketing box (4) to change the temperature of said slurry; in order to change its operating conditions depending on the signal received by said one or more sensors.
    [0010]
    Apparatus according to any one of the preceding claims, characterized in that it comprises a scraper blade (48) adapted to remove said coated net from said mobile support (7) at the exit of said first drying section (21). ).
    [0011]
    Apparatus according to any one of the preceding claims, characterized in that it comprises a second drying section (22) with third independently controlled temperature control means (24), adapted to control a temperature, or a flow rate, or a temperature distribution, or a flow rate distribution or any combination of the above options of drying air in said second drying section (22).
    [0012]
    12. Apparatus according to claim 11, characterized in that said first and said second drying sections (21, 22) are arranged in series, one after the other, said first stage upstream of said second stage in a direction of movement of said coated net.
    [0013]
    13. Apparatus according to any one of the preceding claims, characterized in that said first drying section (21) is divided into a plurality of first drying stages, the drying air temperature and the flow rate of Drying air are independently controlled at each first drying stage.
    [0014]
    14. Apparatus according to any one of the preceding claims, characterized in that it comprises: • a winding section (10) for winding said coated net onto a spool; and • a cooling section (90) downstream of said first or second drying section and upstream of said winding section in the direction of movement of said coated web.
    [0015]
    15. Apparatus according to claim 14, characterized in that said cooling section (90) includes a cooling air generator (92) and fourth temperature control means (91) that control an air temperature of cooling expelled by said cooling air generator.
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    同族专利:
    公开号 | 公开日
    CN106998785A|2017-08-01|
    HUE050551T2|2020-12-28|
    HUE042128T2|2019-06-28|
    TR201814987T4|2018-11-21|
    RU2017123816A3|2019-01-18|
    PL3232824T3|2019-03-29|
    KR20170095205A|2017-08-22|
    ES2814174T3|2021-03-26|
    EP3443851A1|2019-02-20|
    ES2693093T3|2018-12-07|
    CN106998785B|2019-01-29|
    JP6981875B2|2021-12-17|
    BR112017010732A2|2018-01-09|
    US10314328B2|2019-06-11|
    EP3443851B1|2020-07-29|
    US20170303579A1|2017-10-26|
    EP3232824B1|2018-09-26|
    RU2682770C2|2019-03-21|
    WO2016096964A1|2016-06-23|
    JP2018504099A|2018-02-15|
    RU2017123816A|2019-01-18|
    PL3443851T3|2020-12-14|
    EP3232824A1|2017-10-25|
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    法律状态:
    2019-12-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-11-03| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-18| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/12/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP14198174.6|2014-12-16|
    EP14198174|2014-12-16|
    PCT/EP2015/079963|WO2016096964A1|2014-12-16|2015-12-16|Apparatus for the production of a cast web of homogenized tobacco material|
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