• 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:
    Procedure of production of a bi-elastic tubular woven mesh and resulting tubular mesh. The present invention relates to a method of manufacturing, from a sheet of polymeric material, a tubular woven mesh of yarns formed from said sheet of polymeric material, wherein said polymeric material has elasticity in the two axes of the plane which forms the film sheet from which the process starts, having a process in which the stretch ratio, the product heating temperature and the knitting speed are reduced, obtaining a bielastic tubular woven mesh with an elasticity of 40-50 % with respect to its size once the mesh is formed and a retractable power of 20-25%, to be used in packaging, preferably food, such as garlic and onions. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2718119A1
    申请号:ES201731476
    申请日:2017-12-27
    公开日:2019-06-27
    发明作者:Horta Joan Mitjans；Gonzalez Carlos Perez
    申请人:Badalona Pac S L；
    IPC主号:
    专利说明:

    [0001]
    [0002]
    [0003]
    [0004] The present invention relates to a method of manufacturing, from a sheet of polymeric material, of a tubular woven mesh of threads formed from said sheet of polymeric material. The present invention also relates to the tubular woven mesh obtained by this process.
    [0005]
    [0006] Background of the invention
    [0007]
    [0008] There are, and therefore, part of the state of the art, tubular meshes of extruded polymeric material, which are based on the extrusion of a non-elastic polyethylene material, with the result of an extruded mesh.
    [0009]
    [0010] In the same way, there is also a woven mesh resulting from the formation of a base by-product such as a sheet of material for subsequent cutting, stretching and knitting. These by-products have a minimum elasticity, being considered rigid, for the present memory, when breaking by stretches of less than 10% and having a preferred composition based on high density polyethylene.
    [0011]
    [0012] Polymeric film sheets are known, with a variety of compositions used and with various extrusion processes, to create laminated by-products with elastic properties with a chosen directionality.
    [0013]
    [0014] Once these sheets are taken to the equipment that makes the cut, stretched and knitted, the procedure that follows in said machines is based on a cut of the high density polyethylene film sheet, with virtually no elasticity associated, as indicated, in filaments that are stretched in a proportion of 1 to 7, corresponding to the increase in length that is carried out in this process, at a temperature usually greater than 100 ° C, in order to have properties of the filaments that allow said stretching without breakage, since as it has been said at room temperature, it is a practically rigid product.
    [0015] You also have to, the usual speeds of production of the mesh, in its knitting, are approximately 35 meters / minute, so as to have a maximum production, without having problems of breakage of the filaments converted into threads to weave, since in knitting there are greater tensions in the yarn, at higher knitting speed.
    [0016]
    [0017] On the other hand, the product resulting from the previous process is known in the state of the art, a tubular mesh formed from extruded polymeric material, which is used, among others, for the packaging of food products, such as garlic and the onions, and that once they have been introduced, they are packed in the mesh allowing a certain relative movement between the mesh and the contained product, which causes the product to suffer damage or scraping, and a poor aesthetic and shedding of residues or skins in the inside of the bag due to its movement and internal friction, as happens with the outer layers of garlic heads, onions, etc.
    [0018]
    [0019] Each of these products makes it necessary to produce a type of mesh with a specific diameter for each type of product, with the consequent diversity of references produced to cover the needs of different types of product.
    [0020]
    [0021] Description of the invention
    [0022]
    [0023] With the manufacturing method and the product obtained from the present invention, the aforementioned drawbacks are resolved, presenting other advantages that will be described.
    [0024]
    [0025] The present invention is based on a novel method of manufacturing a bielastic tubular woven mesh, from a film sheet of polymeric material of specific properties, which until now had not been possible to adapt to standard cutting, stretching and knitted. Said method is formed of various stages or steps that, at least, comprise the introduction of the film sheet of the polymeric product to be transformed, the filament cutting of said sheet, the heating of said filaments and their stretching, the lubrication of the threads formed previously and your knitting.
    [0026]
    [0027] The method is based on the introduction into the corresponding delivery means, such as the loading rollers, of the film sheet of polymeric material, where said polymeric material can have various compositions, but which must have as critical characteristics that The sheet must have a bidirectional elasticity, understood as longitudinal and transverse elasticity in the plane of the sheet, maintaining a minimum stability thanks to its polymer composition that mixes high and low density polymers, so once formed the thread does not produce narrowing of the minimum necessary width at the transverse level, nor an excessive longitudinal elongation, since both cases make it impossible to knit with guarantees of continuity and deficiencies in the resulting product.
    [0028]
    [0029] Once the film sheet is available, it is cut in filaments of usual size, 1.5 mm preferably in width, proceeding to its heating at a temperature between 60 and 70 ° C, preferably at the same time of the cut or later but always prior to stretching. This heating of the polymer allows to vary its initial properties of the film, becoming an ideal level of stretch for the formation of the mesh, that is, that allows the stretching in the desired proportion without having problems of breakage or problems of excessive stretching, verifying that the heating of said film sheet below this temperature range would cause a lower level of stretching than indicated, which would result in a very irregular resulting mesh, with an accordion effect. In the opposite way, if a heating is carried out above said range, we will have a higher stretch level, the mesh losing the elasticity and longitudinal and transverse retraction properties.
    [0030]
    [0031] The filaments created are stretched at the indicated temperature, with a configuration of the mechanical developments of the stretching means of the equipment where said procedure is performed, which allow the stretching of said filaments between 25-35% lower tension than those used in the known procedures, since this is the optimum tension to proceed to stretch the filaments of the base material, in the range of temperatures indicated, to achieve the optimum level of stretch from 1 to 5. This configuration of the mechanical developments for the stretching of the threads is achieved by modifying the rollers / pinions through which the cut threads of the sheet / film pass, having relations between said roller / pinion diameters of approximately 1 to 5, which in principle would be a little lower, since there has been a minimum stretch of the original film sheet, by creating the tension in the film sheet by passing through the rollers prior to cutting, in transporting said film.
    [0032]
    [0033] Subsequent to this stretch, where the threads that will be used in the formation of the tubular mesh have been formed, and before the knitting is made, it is done a lubrication of the threads with paraffin, advantageously using an amount greater than usual in the known processes, which lubricate the threads using 60 g per 1000 meters of yarn, thus stopping and advantageously in the present process, lubricate the threads created with paraffin in a proportion of between 110 and 140 g per 1000 meters of thread, having its ideal lubrication point in proportion of 125 g per 1000 meters of thread, improving the movement of the thread and its knotting in the knitting.
    [0034]
    [0035] With regard to the lubrication in the process, it has also been experienced that, by applying in various static areas of the process, such as in the static guides of transport / passage of the threads, it is possible to reduce the percentage of thread breaks suffered, with which This areas are lubricated, or an application of non-stick means, such as PTFE surfaces, is being reviewed so as not to lose said property. This application of non-stick materials is made to combat the property of the surface of the created thread, which is more sticky / adherent due to the very nature of the polymer mixture that the film sheet has.
    [0036]
    [0037] Once the plurality of threads enter a knitting head, where the needles of said head make knotted joints of the knitting threads, making the mesh. This preparation is carried out at a maximum speed of 10 meters / minute, which means between 60 and 80% lower usual knitting speed of the base materials previously known in standard processes, which are usually 35 meters / minute but which They can be superior. Knitting is carried out by monitoring and modifying the tensions of the threads in the needles, to avoid that the retractility of the threads causes loss of stitches or hooked in the fabric and continuous stops. The knitted structure in which the tubular mesh is formed can be varied, but preferably, it will be realized by creating a plurality of zigzag longitudinal chains formed by each thread, joined at their vertices by means of a knot woven with the adjacent chains on each side, to the right and left, where the knotting is carried out by means of the threads that form the chain, which allows to have an elasticity both in the longitudinal axis and in the transverse axis, since it is this part of the knot that will work the elasticity in said axis transverse along with the transverse elasticity of the thread, having longitudinal continuity of the thread that forms the zigzag chain.
    [0038]
    [0039] The process ends by passing this tubular mesh formed to the product packaging equipment for later shipment, where the feeding of the packaging machine allows loading a greater number of meters of bielastic tubular mesh manufactured, since the product has an elasticity that allows its compression and therefore an entry of material into the feeding tubes of said packing machine between 2.5 or 3 times more than the usual meshes, issue that can also be extrapolated to its storage, which allows, in the same space as the usual products of polymeric material, to have 300% more material than if it were usual extruded mesh.
    [0040]
    [0041] The bielastic tubular mesh obtained by this procedure is formed by a plurality of threads of elastic polymeric material that have longitudinal and transverse elasticity, which form a tubular knitted fabric forming a structure, usually rhomboid, which allows to develop the elasticity of the mesh both longitudinally and transversely in a 40-50% elasticity percentage, in turn having retractable properties when subjected to temperatures between 70 and 90 ° C in which the mesh shrinks between 20 and 25%.
    [0042]
    [0043] These properties allow the adaptability of the tubular mesh to the products that are to be packaged, given the elasticity in width and length, adjusting to the products and preventing their relative movement of some with respect to the others, avoiding frictions that can damage the appearance of the product. In the same way, the mesh has a greater softness due to the properties of the polymer, as well as the lower stretch and the lower temperature used in the process.
    [0044]
    [0045] This adaptability allows not having to produce different tubular meshes with different diameters, since it will allow its adaptation to slightly different diameters, given said elasticity in the transverse axis of said tubular mesh. It also has to, thanks to its temperature shrink feature, the mesh adapts to the most exact form of the product once it is introduced into the packaging lines in the tunnels or heat shrink equipment.
    [0046]
    [0047] In this way, we have a manufacturing method that allows to work a polymer film sheet that has properties that until now had not been able to transform into a tubular mesh, given the difficulty of its productive industrial treatment, which seeks to obtain the greater number of meters of tubular mesh with the lowest risks of filament or thread breakage, and that would mean an increase in costs due to unproductivity, obtaining said bielastic tubular mesh by this procedure, managing to provide properties to woven tubular meshes that are not known in the state of the art and that allow an ideal adjustment to the products they contain, either due to their elasticity or taking advantage of their retractable power when subjected to a certain temperature increase.
    [0048]
    [0049] Brief description of the figures
    [0050]
    [0051] To better understand how much has been exposed, some drawings are attached in which, schematically and only by way of non-limiting example, a practical case of realization is represented.
    [0052]
    [0053] Figure 1 is a view of a section of the bielastic tubular mesh formed.
    [0054]
    [0055] Figure 2 is a partial view of two of the chains that form the mesh and the joint between them to form the mesh.
    [0056]
    [0057] Description of a preferred embodiment
    [0058]
    [0059] In the present preferred embodiment of the invention, it is necessary that the method of manufacturing the bielastic tubular woven mesh (10) starts from the introduction into the means of supply of material to the process, of a film sheet of polymeric material, which is composed, in the present embodiment, of a multilayer mixture of high density polymer with a low density polymer that extrusionly forms the film sheet used and which has a bidirectional elasticity in the plane of the sheet itself, when made with a degree special orientation and formation of the sheet at the exit of the corresponding extrusion head.
    [0060]
    [0061] This film film in the form of a coil, is passed through the different rollers that tension it minimally to take it to the cutting stage, where the material is heated at the same time of the cut at a temperature of 60 to 70 ° C , which allows this cut in threads (11) to be carried out efficiently in width sizes of 1.5 mm, to subsequently and working in said temperature range, perform the stretching stage where, by means of the diameter ratio of the different rollers and pinions that engage in the usual transmission of the production equipment movement, are performs a stretching of said threads (11) from 1 to 5 in its final part and with respect to its initial size in the roller.
    [0062]
    [0063] The threads (11) formed, once cut and stretched to the desired size, are lubricated with paraffin in an application rate of 125 g per 1000 meters of thread, which allows to improve the handling conditions in the process, being the thread (11) more sticky / adherent to contact with other surfaces, so that in addition to this lubrication for knitting, at various points of the process, where there are static points of contact where the thread (11) runs, a decrease is made of the adhesions between the equipment and the thread (11), incorporating in these areas PTFE surfaces, such as Teflon®, so that the thread (11) is less likely to catch and therefore break.
    [0064]
    [0065] The creation of the bielastic tubular mesh (10) is carried out in the next step, having each of the threads (11) enter a knitting head, where the needles make a confection at a maximum speed of 10 meters / minute bielastic tubular mesh (10). This preparation is made so that the structure of said bielastic tubular mesh (10) is formed by the union of chains (12) of threads (10), where the chains (12) follow a zigzag configuration, joining at their vertices with the chains (12 ') adjacent to the right and left of it. These unions (13) at their vertices are made by knotting through the two threads (10) that form each of the chains (12, 12 ’). This configuration of the structure and properties of the film sheet gives the mesh an elasticity of 40-50% on both a longitudinal and transverse axis.
    [0066]
    [0067] Finally, the manufacturing method ends with the packaging of said bielastic tubular mesh (10) which, as it is produced, can be compressed, and even later, for storage, a new compression and elimination of air can be carried out, to minimize the space thanks to its high elasticity.
    [0068]
    [0069] Thus, the bielastic tubular mesh (10) is formed by a plurality of threads (11) of polymeric material composed of various layers mixing high and low density polymers, which have a bi-directional elasticity of 40-50% which by knitting it forms chains (12, 12 ') in zigzag that are joined (13) by their vertices with the adjacent chains to the right and left by knotting, to form said bielastic tubular mesh (10).
    [0070] Said mesh has a reduction in size by shrinkage of between 20-25% when subjected to an increase in its temperature, by placing it between 70 and 90 ° C, which allows it to have a mesh (10) with an elasticity power and very important shrink wrapping, and therefore be ideal for the packaging of food products, such as garlic, onions, etc., adapting to them immediately if the mesh has a smaller diameter, and therefore has to stretch to be able to introduce the products and then being adapted to said products, or adapting by shrinking and reducing their size as the product already packaged in said bielastic tubular mesh passes through heating means (10).
    [0071]
    [0072] Although reference has been made to a specific embodiment of the invention, it is apparent to one skilled in the art that the method of manufacturing a bielastic tubular woven mesh, as well as the resulting tubular mesh described is susceptible to numerous variations and modifications. , and that all the mentioned details can be replaced by other technically equivalent ones, without departing from the scope of protection defined by the appended claims.
    权利要求:
    Claims (10)
    [1]
    1. - Method of manufacturing a bielastic tubular woven mesh from those that start from a sheet of polymeric film which is cut, stretched and knitted to form said tubular mesh, characterized in that the process comprises at least the following steps:
    • It starts from the introduction in the manufacturing process of a sheet of polymeric film.
    • The filaments are cut, which are heated prior to stretching at a temperature between 60 and 70 ° C;
    • Each of the filaments is stretched at a tension in a proportion of 1 to 5 with respect to the initial size, forming the threads (11) to be knitted;
    • Each of the threads (11) is lubricated so that between 110 and 140 g are applied every 1000 meters of thread (11) formed;
    • The threads (11) enter a knitting head, where the needles make joints (13) knotted of the threads (11) forming a chain structure (12);
    wherein the polymeric film has elasticity in the two axes of the sheet plane, longitudinally and transversely, with a multilayer blend composition of high and low density polymers.
    [2]
    2. - Method of manufacturing a bielastic tubular woven mesh according to claim 1a, wherein the knitting is performed by forming a plurality of longitudinal zigzag chains (12, 12 ') joined at their vertices with the adjacent chains on each side by knotting (13) with the threads themselves (11) that form the chains (12, 12 ').
    [3]
    3. - Method of manufacturing a bielastic tubular woven mesh according to claim 1a, wherein the cutting of the film sheet is made at a size of 1.5 mm per filament.
    [4]
    4. - Method of manufacturing a bielastic tubular woven mesh according to claim 1a, wherein the heating is carried out at the same time of cutting or later.
    [5]
    5. - Method of manufacturing a bielastic tubular woven mesh according to claim 1a, wherein the lubrication of the threads (11) is performed by applying 125 g per 1000 meters of thread (11).
    [6]
    6. Method of manufacturing a bielastic tubular woven mesh according to claim 1a, wherein the lubrication of the process is performed additionally with lubricating or non-stick means in the static guides of transport / passage of the threads.
    [7]
    7. Method of manufacturing a bielastic tubular woven mesh according to claim 1, wherein the knitting speed is a maximum of 10 meters / minute.
    [8]
    8. - Method of manufacturing a bielastic tubular woven mesh according to claim 1a, wherein after the knitting the product is packaged for later shipment, compressing the bielastic tubular mesh (10).
    [9]
    9. - Bielastic tubular woven mesh obtained by the method described in the preceding claims, characterized in that the bielastic tubular mesh (10) comprises a plurality of threads (11) with longitudinal and transverse elastic properties, which form the knitted structure of the tubular mesh, where the bielastic tubular mesh (10) has a transverse and longitudinal elasticity of 40 to 50% and that at a temperature between 70 and 90 ° C retracts 20-25%
    [10]
    10. - Bielastic tubular woven mesh according to claim 9a, wherein the structure of the bielastic tubular mesh (10) is formed by zigzag chains (12, 12 ') that are joined (13) by their vertices with the chains contiguous to right and left by knotting.
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    同族专利:
    公开号 | 公开日
    EP3517669A2|2019-07-31|
    ES2718119B2|2022-01-11|
    EP3517669A3|2019-09-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    ES2154197A1|1998-12-15|2001-03-16|Gimar Sa|Elastic tubular knitted fabric and process for obtaining the same|
    ES2278500A1|2005-06-20|2007-08-01|Giro Gh, S.A.|Mesh for bags or packaging|
    DE202014101193U1|2014-03-17|2015-06-18|Isofer Ag|mesh|
    EP3173512A1|2014-07-23|2017-05-31|Girnet Internacional, S.L.|Woven or extruded net, use of the net for making a bag and bag for containing products|
    EP3196346A1|2016-01-20|2017-07-26|KKV Marken- und Patentschutz GbR|Netlike knitted elastic material and method for the production of same|
    FI46189C|1966-03-22|1973-01-10|Gassol Manuf Antonio|Process for the production of tubular textile articles with warp knitting machine.|
    US4060999A|1974-11-05|1977-12-06|Enterprise Incorporated|Method and apparatus for forming yarn elements and producing products therefrom|
    US5104714A|1989-11-30|1992-04-14|Tama Plastic Industry|Elastic plastic netting made of oriented strands|
    法律状态:
    2019-06-27| BA2A| Patent application published|Ref document number: 2718119 Country of ref document: ES Kind code of ref document: A1 Effective date: 20190627 |
    2022-01-11| FG2A| Definitive protection|Ref document number: 2718119 Country of ref document: ES Kind code of ref document: B2 Effective date: 20220111 |
    优先权:
    申请号 | 申请日 | 专利标题
    ES201731476A|ES2718119B2|2017-12-27|2017-12-27|MANUFACTURING METHOD OF A BI-ELASTIC TUBULAR WOVEN MESH AND RESULTING TUBULAR MESH|ES201731476A| ES2718119B2|2017-12-27|2017-12-27|MANUFACTURING METHOD OF A BI-ELASTIC TUBULAR WOVEN MESH AND RESULTING TUBULAR MESH|
    EP18215521.8A| EP3517669A3|2017-12-27|2018-12-21|Method for manufacturing a bi-elastic tubular knitted mesh and resulting tubular mesh|
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