KR101318137B1 - thermoplastic polyurethane multilayer films - Google Patents

Abstract

The present invention is to implement a method for producing a thermoplastic polyurethane film without using a release paper or a release film, preferably by controlling the surface of the touch roller and the cooling roller of the film extruded through the T-Dice machinery Various irregularities could be formed on the surface of the film, and as a result, when the film is wound, it serves to reduce the surface area in contact with the surface of the opposite film, which may significantly lower the adhesive force between the films. Due to its characteristics, there is a feature that can enable smooth production without release paper or release film.
Such a manufacturing method of the present invention can be said to be a very environmentally friendly product because it can completely remove the release paper or release film waste that occurred during the use of the final film, by reducing the production cost by not using the release paper or release film directly economical There is also an advantage that can be obtained.

Description

A method for producing a thermoplastic polyurethane multilayer film without using a release paper or a release film {thermoplastic polyurethane multilayer films}

The present invention relates to a method for manufacturing a thermoplastic polyurethane film having a multi-layer structure, and more particularly, without using a release paper or a release film used to prevent sticking between films generated when the final film product is wound. The present invention relates to a method for producing a polyurethane multilayer film.

Shoes, which are a necessity of modern life, have recently become increasingly sophisticated and fashion. In the past, simple products with simple functions and no special functions have become mainstream, but in recent years, high value-added products with innovatively improved functions such as ignition, shock buffer, and light weight have become mainstream. As this improves, there is an increasing demand for it. In addition, as shoes form a strand of fashion, various designs of shoes have been developed, and new concepts have been incorporated into the development of shoes.

Meanwhile, various efforts have been made to reduce the weight and simplify the manufacturing process as one of the main concerns of development. In order to achieve the purpose of weight reduction, we studied how to use light materials or change the design to produce a similar effect using a small amount of materials. In order to simplify the manufacturing process, a lot of attention has recently been made on the technology of manufacturing shoes by simply gluing without sewing or simplifying the sewing process that requires the most manpower and time in the manufacturing process. It is partly applied and is increasing rapidly.

In order to achieve this purpose, a method of using a hot melt film has been continuously developed. The hot melt film is inserted between the materials to be attached to each other, and then heat and pressure are used to fusion. Only a few seconds can complete the adhesion between the fabric and the fabric can significantly reduce the process cost, and the sewing thread was not exposed, it was possible to manufacture shoes with a better appearance in terms of design. This manufacturing method is called a no-sew manufacturing process.

The non-sewing manufacturing process is being applied steadily due to the economic effect of reducing the manufacturing cost and the advantages of light weight, and derivative technologies are constantly developing and introducing various products. In recent years, the thermoplastic polyurethane is extruded by a multi-layer extruder to increase the number of examples of applying a multi-layer thermoplastic polyurethane film designed differently depending on the purpose of use.

As a representative example, there is a two-layer thermoplastic polyurethane film in which a thermoplastic polyurethane having a high heat resistance temperature constitutes one layer and a thermoplastic polyurethane-based hot melt resin having a low heat resistance temperature is constituted by another layer.

Looking at the manufacturing process of the product (that is, the thermoplastic polyurethane film of the two-layer structure), first, the thermoplastic polyurethane resin having a high heat resistance temperature is extruded on a release paper or a release film. Next, the thermoplastic polyurethane resin having a low heat resistance temperature is extruded once more on the thus prepared film (ie, a release paper (or a release film) + a thermoplastic resin having a high heat resistance temperature). As a result, a thermoplastic polyurethane multilayer film produced by a non-sealing process consisting of "release paper (or release film) + high temperature resistant thermoplastic polyurethane resin + low temperature resistant thermoplastic polyurethane resin" is produced.

On the other hand, the final product is the same form, but another manufacturing method may be extruded at the same time by a method of co-extrusion of a high heat-resistant thermoplastic polyurethane resin and a low heat-resistant thermoplastic polyurethane resin through a multilayer film extruder on a release paper. In the former case, two extrusion processes are performed. In the latter case, the same type of product is manufactured by one extrusion.

The film thus produced is used as a material for manufacturing shoes in the shoe manufacturing process. The shoe is divided into various parts, and the part to which the film is applied is mainly an upper corresponding to a part surrounding the instep of the foot. Looking at the general process of manufacturing the upper, first cut the film to a predetermined size, and then put the cut film on the desired portion of the top of the fabric and then bonded to the fabric by pressing with a heat press of 130 ℃ or more. Thereafter, the release paper or the release film attached to the surface of the film is removed and completed. Alternatively, the release paper or the release film may be removed first before the heat press, and then the heat press may be performed.

Depending on the design of the shoe, the heat press process may be completed at one time or several heat presses may be repeated by adding film to another part. In any case, the production of the upper is finished by heat press, and then the process of making the upper made of various fabrics in three-dimensional form is performed in this way. And finally, by bonding to the sole (sole) to complete the final shoe product.

However, when using conventional release paper or release film as described above, the end product user must remove these release paper or release film during the use process, and the final product has a large amount of waste due to unnecessary release paper or release film. It results in what happens. This is in contrast to the growing interest in environmentally friendly products and production methods in recent years, which is a problem that is actually encountered during manufacturing processes of various industries. In addition, there is an advantage in that the release film is more recyclable than the release paper, but this also consumes a lot of energy during the regeneration process, which is not environmentally friendly.

The present invention is to solve the above conventional problems, to provide a method for producing a thermoplastic polyurethane multilayer film without a release paper or release film used for the convenience of film production in manufacturing a thermoplastic polyurethane multilayer film. Its purpose is.

In addition, the present invention is to extrude the thermoplastic polyurethane of the relatively high component with a high cooling rate with a hot melt made of a slow cooling and soft composition when extruding the multilayer thermoplastic polyurethane film at the same time without the release paper or release film It is an object of the present invention to provide a method for producing a thermoplastic polyurethane multilayer film that can withstand the tension caused by the film production.

In addition, the present invention is a matte or semi-gloss form of the surface of the film in order to prevent the adhesion between the film surface and the adhesion between the roll surface and the film generated when the film is rolled and rolled thermoplastic polyurethane multilayer film It is an object of the present invention to provide a method for manufacturing a thermoplastic polyurethane multilayer film without using a release paper or a release film that can achieve smooth winding and unwinding by preventing the adhesive force between them by extrusion using a roller.

The present invention is a co-extrusion method comprising a release roller or a release film by using a touch roller and the first and second cooling rollers constituting the tee-dice, pressing and cooling the thermoplastic polyurethane resin and hot melt extruded through the tee-dice. In the method of manufacturing a thermoplastic polyurethane multilayer film without using, a process of matting or semi-glossing the surface of the touch roller, and forming an uneven shape on the surface of the first cooling roller, and the touch roller and the first When the thermoplastic polyurethane resin and the hot melt is passed between the cooling rollers while being extruded, the concave-convex shape is formed on the surface of the hot melt.

The present invention can eliminate the waste generated during the shoe manufacturing process by not using a release paper or a release film, which can reduce the manufacturing cost of the film and also reduce the costs that may occur in the reprocessing and disposal of the waste In addition, there is no carbon dioxide generation during the reprocessing process, and there is also an advantage to eliminate the environmental impact caused by disposal.

1 is a view showing a method for manufacturing a thermoplastic polyurethane multilayer film without using a release paper or a release film according to an embodiment of the present invention.
FIG. 2 is a view illustrating a state in which a thermoplastic polyurethane multilayer film not using a release paper or a release film manufactured by the method illustrated in FIG. 1 is wound.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description, representative embodiments of the present invention will be presented in order to achieve the above technical problem. In the following description, specific embodiments of the present invention will be described with reference to FIGS. 1 and 2.
In the present invention, to implement a method of manufacturing a thermoplastic polyurethane multilayer film without using a separate release paper or a release film that is usually used when extrusion by manufacturing a hot melt adhesive thermoplastic polyurethane multilayer film.
Preferably, the surface of a touch roller and a cooling roller (preferably, a first cooling roller) used when extruding a thermoplastic polyurethane multilayer film (hereinafter referred to as "film") from a conventional co-extrusion tee dies. By adjusting the pressure, various irregularities can be formed on the surface of the film, and as a result, it serves to reduce the surface area in contact with the surface of the opposite film when the film is wound so that the adhesive force between the films can be drastically lowered. It provides a method for producing a thermoplastic polyurethane multilayer film without using a release paper or a release film.
The thermoplastic polyurethane multilayer film produced in this way is a very eco-friendly product because it can completely remove the waste such as release paper or release film that occurred during the final use of the film, and also does not use the release paper or release film. By reducing the production cost.
On the other hand, in the case of a film having a thickness of 0.5 mm or less, which is a very thin film such as a film used for hot melt, it is very difficult to produce a film having a precise thickness and width due to the mechanical tension of the T-die extrusion production apparatus. However, when using a multi-die extruder, it was possible to cope with the tension applied by the machine by using a thermoplastic polyurethane resin having a relatively high cooling rate.
Particularly, in the present invention, the molten thermoplastic polyurethane resin and the hot melt (specifically, the thermoplastic polyurethane hot melt) exiting the tee-die are processed by the uneven (embossed) surface of the first cooling roller to the first cooling roller. Since the uneven shape of the first cooling roller forms the same uneven shape on the surface of the hot mat in the process of cooling by contact, it is possible to manufacture a thermoplastic polyurethane multilayer film without using a release paper or a release film.
At this time, touch rollers for compressing the resin (thermoplastic polyurethane and hot melt) and second cooling rollers for simple cooling are arranged on both sides of the first cooling rollers, and the rollers are pulled out of the tee die by these rollers. The resulting resin is made of a thermoplastic polyurethane multilayer film that does not require a separate release paper (or release film). In this case, the touch roller may be a silicon roller having a matt or semi-glossy shape, and the first cooling roller and the second cooling roller may be steel or teflon cooling rollers.
As described above, the surface of the touch roller was matted or semi-glossy or the surface of the first cooling roller was embossed so that a desired pattern was transferred to the surface of the film. The embossed film is reduced in the outermost surface area is to prevent the adhesion with the opposite film surface when rolling. Therefore, the thermoplastic polyurethane multilayer film of a thin film can be extruded without using a release paper or a release film.

Hereinafter will be described in detail based on the preferred embodiment of the present invention, the present invention is not limited by the embodiment.
{Example 1}
Table 1 below presents the composition of the upper layer and the lower layer when extrusion molding a thermoplastic polyurethane multilayer film without using a release paper or a release film, and is also used when extrusion molding a film using a T-die apparatus. The configuration of the touch roller and the first cooling roller were described in detail.
Composition resin Surface treatment Upper layer Thermoplastic Polyurethane with Hardness Shore A85 ~ 90 Matte Silicone RTV Touch Roller substratum Thermoplastic Polyurethane Hot Melt with Hardness Shore A65 ~ 75 Mesh processing steel roller
Working temperature conditions when extrusion molding a thermoplastic polyurethane film using the resin are shown in Table 2, the results of testing the physical properties of the multilayer film is shown in Table 3.
cylinder adapter Dice Upper layer 170 175 180 185 185 185 180 180 180 180 180 substratum 150 155 160 165 165 165 160 160 160 160 160
Upper layer: 100 µm, lower layer: 150 µm 300% modulus 80kgf / ㎠ The tensile strength 250kgf / ㎠ Elongation 700% Tear Strength 70kgf / cm
As shown in Example 1, the thickness of each layer and the entire film was 100 ~ 300 ㎛ for the upper layer, 100 ~ 300 ㎛ could be produced without problems in the lower layer, the product in the above and below Production was possible.
At this time, the touch roller is a room temperature curing (hereinafter referred to as "RTV") touch roller is preferably used, the mesh processing surface steel roller (ie, the first cooling roller) is processed to 120 ~ 130 mesh Rollers were used. It is also possible to use sanding steel rollers as well as the mesh steel rollers.
As a result, a two-layer film consisting of a thermoplastic polyurethane upper layer matted by a matt silicon RTV touch roller and a thermoplastic polyurethane hotmelt underlayer treated by a mesh steel roller (ie, a first cooling roller) was produced. The film was prepared without a release paper and a release film, there is no problem in the unwinding of each roller because there is no surface adhesion. In addition, there is no release paper and release film, so there is no waste generated in the heat press process.
On the other hand, in some cases, a yellowing master batch, a color master batch for producing color, and a small amount of additives (for example, waxes or flow improvers, etc.) for improving film formability may be used in small amounts.

{Example 2}
Table 4 presents the composition of the upper layer and the lower layer when extrusion molding a thermoplastic polyurethane multilayer film without using a release paper or a release film, and also a touch roller and a first cooling roller used when extruding the multilayer film. Are each described in detail.
Composition resin Surface treatment Upper layer Thermoplastic Polyurethane with Hardness Shore A85 ~ 90 Matte Silicone RTV Touch Roller substratum Thermoplastic Polyurethane Hot Melt with Hardness Shore A75 ~ 85 Mesh processing steel roller
Working temperature conditions when extrusion molding a thermoplastic polyurethane film using the resins shown in Table 4 are shown in Table 5, the results of testing the physical properties of the multilayer film is shown in Table 6.
cylinder adapter Dice Upper layer 170 175 180 185 185 185 180 180 180 180 180 substratum 155 160 165 165 165 165 165 165 165 165 165
Upper layer: 100 µm, lower layer: 150 µm 300% modulus 90kgf / ㎠ The tensile strength 300kgf / ㎠ Elongation > 650% Tear Strength 80kgf / cm
In Example 2, the thermoplastic polyurethane hot melt used in the lower layer used a product having a higher hardness. There was only a slight change in the film final physical properties, but there was no difference in extrusion workability and final product appearance. Similarly to Example 1, a two-layer film consisting of a thermoplastic polyurethane upper layer matted by a matt silicon RTV touch roller and a thermoplastic polyurethane hotmelt lower layer treated by a mesh steel roller (i.e., the first cooling roller) was prepared. It became.

{Example 3}
Table 7 below shows the composition of the upper layer and the lower layer when extrusion molding a thermoplastic polyurethane multilayer film, and also in detail the configuration of the touch roller and the first cooling roller used when extrusion molding the multilayer film. It was.
Composition resin Surface treatment Upper layer Thermoplastic Polyurethane with Hardness Shore A90 ~ 95 Matte Silicone RTV Touch Roller substratum Thermoplastic Polyurethane Hot Melt with Hardness Shore A75 ~ 85 Mesh processing steel roller
Extrusion working temperature conditions when extruding a thermoplastic polyurethane film having a multilayer structure using the resin are shown in Table 8, and the results of testing the physical properties of the multilayer film are shown in Table 9.
cylinder adapter Dice Upper layer 175 180 185 190 190 195 195 195 195 195 195 substratum 155 160 165 165 165 165 165 165 165 165 165
Upper layer: 100 µm, lower layer: 150 µm 300% modulus 100kgf / ㎠ The tensile strength 350kgf / ㎠ Elongation > 600% Tear Strength 90kgf / cm
In Example 3, a product having a higher hardness was used for the thermoplastic polyurethane resin used in the upper layer. Similarly, there was only a slight change in film final physical properties, but there was no difference in extrusion workability and final product appearance. Similarly to Example 1, a two-layer film consisting of a thermoplastic polyurethane upper layer matted by a matt silicon RTV touch roller and a thermoplastic polyurethane hotmelt lower layer treated by a mesh steel roller (i.e., the first cooling roller) was prepared. It became.

{Example 4}
In Table 10 below, when extruded a thermoplastic polyurethane multilayer film without using a release paper or a release film, the composition of the upper layer and the lower layer was presented in detail, and the touch roller and the first roller used when the multilayer film was extruded. The cooling rollers were described in detail, respectively.
Composition resin Surface treatment Upper layer Thermoplastic Polyurethane with Hardness Shore A85 ~ 90 Semi-gloss Silicone RTV Touch Roller substratum Thermoplastic Polyurethane Hot Melt with Hardness Shore A75 ~ 85 Mesh processing steel roller
Extrusion working temperature conditions when extruding a thermoplastic polyurethane film having a multilayer structure using the resin are shown in Table 11, and the results of testing the physical properties of the multilayer film are shown in Table 12.
cylinder adapter Dice Upper layer 170 175 180 185 185 185 180 180 180 180 180 substratum 155 160 165 165 165 165 165 165 165 165 165
Upper layer: 100 µm, lower layer: 150 µm 300% modulus 100kgf / ㎠ The tensile strength 350kgf / ㎠ Elongation > 600% Tear Strength 90kgf / cm
In Example 4, a semi-glossy silicon RTV touch roller was used instead of the matte silicon RTV touch roller.

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Claims (7)

A matte or semi-glossy touch roller and a first cooling roller having a concave-convex shape are formed on the surface, and the thermoplastic polyurethane resin and hot melt extruded by co-extrusion method while passing between the touch roller and the first cooling roller. In the method of manufacturing a multilayer film,
The thermoplastic polyurethane has a Shore hardness of A85 to 90, and the hot melt has a Shore hardness of A65-75;
The touch roller is made of silicon, and the first cooling roller is made of steel;
The thermoplastic polyurethane multilayer film has a thickness of 100 to 300 µm;
When the thermoplastic polyurethane resin and the hot melt are passed between the touch roller and the first cooling roller while being extruded, the process of forming a concave-convex shape on the surface of the hot melt is performed without using a release paper or a release film. A method of making a thermoplastic polyurethane multilayer film.




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