JP4930836B2 - Laminated fabric and method for producing the laminated fabric - Google Patents

Description

The present invention relates to a process for the production of the product layer the fabric and the laminate workpiece cloth.

  Conventionally, various laminated fabrics are used for waterproof sheets to avoid moisture such as rain, covering sheets for building materials, concrete curing sheets, and box covers that protect items on flexible containers and pallets from rain and dust. ing. As these laminated fabrics, a laminated fabric is produced by laminating a protective layer on a woven fabric woven using polypropylene (PP) or polyethylene (PE) drawn tape (hereinafter referred to as “yarn”). Since these are lightweight, they are used for various purposes.

As such a laminated fabric, Patent Document 1 describes a base fabric obtained by laminating PE polymerized with a metallocene catalyst on a woven fabric using yarn made of high density polyethylene (HDPE).
Such woven fabrics woven from yarns made of HDPE are frequently used because of their good extrusion laminate suitability and excellent adhesion to a protective layer made of PE.
As the PE used for the protective layer, low density polyethylene (LDPE) excellent in extrusion laminate suitability and heat seal suitability and ethylene-α olefin copolymer (LLDPE) excellent in mechanical strength are frequently used.

However, when the laminated fabric is molded into various sheets, flexible containers, pallet covers, etc., the protective layer made of LDPE or LLDPE has a problem that it cannot be processed by a high-frequency welder.
In order to solve this problem, the base fabric to which the high-frequency welder is applied includes PE having a polar group such as a carboxyl group instead of LDPE or LLDPE, for example, a copolymer of ethylene and acrylic acid or ethylene-vinyl acetate. A copolymer (EVA) or the like is laminated. (For example, Patent Document 2)

However, a copolymer of ethylene and acrylic acid has a problem that a product having excellent physical strength such as wear resistance cannot be obtained.
EVA, on the other hand, raises the temperature just below the die to about 260 ° C for extrusion lamination with sufficient extrusion laminate film adhesion strength (hereinafter referred to as "film adhesion strength") to a woven fabric woven from HDPE yarn. There was a need. However, at this temperature, EVA was decomposed and extrusion lamination for a long time was impossible.
Therefore, with EVA, it was not possible to produce a laminated fabric efficiently and continuously with high film adhesion strength. If the laminated fabric does not have high film adhesion strength, there is a problem that the peel strength (welding strength) when the laminated fabrics are welded to each other is reduced. In addition, when used outdoors for a long period of time, the laminated fabric may peel off due to the outdoor wind and cracks may occur in the protective layer. In the present specification, the resistance of the protective layer against flaking is referred to as “flaking resistance”.
JP-A-10-272746 JP 2006-45685 A

The present invention has been made in view of the above circumstances, and is a multilayer that can be extruded and laminated with a resin having high film adhesive strength and high-frequency welder suitability when made into a woven fabric, and a laminated fabric having a high welding strength can be obtained. and to provide a method of manufacturing a multilayer workpiece cloth can be continuously woven laminate the fabric and high film bond strength with yer down producing efficiently stacked workpiece cloth.

  In order to solve the above-mentioned problems, the inventors of the present invention have made extensive studies and have succeeded in reducing the temperature of the EVA extrusion laminate by improving the HDPE yarn, and the present invention has been made.

That is, the present invention is a laminated fabric made of polyolefin, and an outer layer made of EVA resin having a vinyl acetate group content of 3% by mass to 20% by mass is laminated on both surfaces of an intermediate layer made of HDPE. ethylene is a content of the vinyl acetate groups of between 5% to 25% by weight on both sides of the woven fabric multi layer yarn stretched were used for the warp and / or weft a laminate having at least three layers - vinyl acetate There is provided a laminated cloth characterized in that a protective layer is formed by extrusion laminating a copolymer resin .
In this specification, the EVA resin (ethylene-vinyl acetate copolymer resin) is a single EVA (ethylene-vinyl acetate copolymer) or a polyolefin containing EVA. It may be a kind of EVA, or a mixture of EVA and polyolefins other than EVA. For example, high-VA EVA and various densities of PE such as LDPE and LLDPE, PE copolymer resins such as ionomers and PP Such polyolefins may be mixed.
In the yarn used in the present invention , the content of vinyl acetate groups (hereinafter abbreviated as “VA ratio”) in the EVA resin of the outer layer is preferably 3% by mass to 20% by mass.

In the laminated fabric of the present invention, it is preferable that at least one of the protective layers is matted in a mat shape.
Furthermore, the present invention relates to a method for producing a laminated fabric made of polyolefin , wherein an ethylene-vinyl acetate copolymer having a vinyl acetate group content of 3% by mass to 20% by mass on both surfaces of an intermediate layer made of high-density polyethylene. A multilayer stretched tape in which an outer layer made of a polymer resin is laminated and a laminate having at least a three-layer structure is stretched. The EVA resin is placed on both sides of the woven fabric used for the warp and / or the weft, and the temperature immediately below the die is 190 ° C. Provided is a method for producing a laminated fabric, which is formed by extrusion lamination at ˜250 ° C. to form a protective layer .
In the method for producing a laminated fabric of the present invention, it is preferable that the cooling roll used on at least one surface is a mat roll in extrusion lamination.

According to the yarn and woven fabric made of polyolefin used in the present invention , it is possible to obtain a laminated fabric made of polyolefin having high film adhesion strength and high-frequency welder suitability in which a protective layer made of EVA resin is firmly laminated.
As a result, the laminated fabric of the present invention has a high welding strength, and the protective layer made of EVA resin has excellent flexibility because it is flexible, and when used outdoors for a long time, the protective layer No cracks occur. Moreover, since this laminated fabric is soft, it has excellent handleability and good texture.

In addition, when at least one surface of the laminated fabric of the present invention is matted in a mat shape, blocking does not occur when winding and storing.
Furthermore, the laminated fabric of the present invention is light because all the layers are made of polyolefin, is less likely to generate harmful substances during incineration, and is excellent in discardability.
And according to the manufacturing method of the laminated fabric of this invention, since EVA does not decompose | disassemble at the time of extrusion lamination of a protective layer, generation | occurrence | production of foreign materials, such as a gel derived from EVA and a carbide | carbonized_material, does not occur. Therefore, there is no occurrence of defects such as streaks due to EVA-derived foreign matters during extrusion lamination, and there is no need to disassemble and clean the T-die or the extruder, and the outer layer made of EVA resin is continuously and efficiently laminated firmly. It is possible to produce a laminated fabric.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 is a sectional view showing an example of the structure of the yarn 1 Ru used in the present invention.
This yarn 1 has a three-layer structure in which outer layers 3 are respectively laminated on both surfaces of a layered intermediate layer 2.
When forming the yarn 1, the intermediate layer 2 and the outer layer 3 may each be formed into a film and then laminated by dry lamination with an adhesive or by extruding the outer layer 3 on both sides of the intermediate layer 2. It is good, but the method of laminating the resin constituting the intermediate layer 2 and the outer layer 3 simultaneously with the film formation by co-extrusion method, slitting to a predetermined width, and then heat-stretching 5-8 times, preferably 6-7 times, This is advantageous from the viewpoint of adhesion between the intermediate layer 2 and the outer layer 3 and manufacturing costs.

The intermediate layer 2 is responsible for most of the mechanical strength of the yarn 1. HDPE is used as the resin for forming the intermediate layer 2. HDPE is not particularly limited, but the density is in the range of 0.945 to 0.970 g / cm ³ , preferably 0.951 to 0.967 g / cm ³ , and the melt flow rate (MFR) is 0. The range of 4 to 1.5 g / 10 min, preferably 0.6 to 1.0 g / 10 min is suitable.
If the density is less than this range, the mechanical strength such as the tensile strength of the yarn 1 is lowered, and if the density exceeds this range, the workability is poor, which may cause inconvenience during film formation and stretching.
Further, if the MFR is less than this range, the workability is poor and inconvenience occurs during film formation or stretching. If the MFR exceeds this range, the mechanical strength such as the tensile strength of the yarn 1 may be lowered. .

The outer layer 3 is laminated to improve the film adhesion strength when the yarn 1 used in the present invention is woven into a woven fabric and the EVA resin is extrusion laminated. The EVA resin forming the outer layer 3 is an EVA resin having a VA ratio in the range of 3 to 20% by mass, preferably in the range of 5 to 10% by mass.
When the VA ratio is less than this range, the EVA resin on the surface of the yarn 1 becomes difficult to melt when the EVA resin protective layer is extrusion laminated to the woven fabric, and the film adhesive strength may be lowered. On the other hand, if the VA rate exceeds this range, stickiness may occur, and the processability of producing the yarn 1 and woven into the woven fabric using the yarn 1 may deteriorate. In addition, cohesive failure in the outer layer 3 is likely to occur, and when a laminated fabric in which a protective layer of EVA resin is laminated on a woven fabric made of woven yarn 1, the weld strength of the laminated fabric is reduced. There is.

The density of the EVA resin forming the outer layer 3 has a part depending on the VA rate and is not particularly limited, but the density is in the range of 0.910 to 0.950 g / cm ³ , particularly 0.920 to 0.930 g. Those in the range of / cm ³ are excellent in workability and suitable. If the density exceeds this range, the VA rate may exceed the above range.
The MFR of the EVA resin forming the outer layer 3 is preferably in the range of 0.3 to 2.0 g / 10 minutes, and more preferably in the range of 0.5 to 1.50 g / 10 minutes.
If the MFR is less than this range, the processability is poor, which may cause inconvenience during film formation. If the MFR exceeds this range, the mechanical strength such as the film adhesion strength of the yarn 1 may be lowered.

  The thickness of the yarn 1 is automatically determined by the density of the resin constituting the yarn 1, the width of the yarn 1, and the fineness of the yarn 1, but is generally 20 to 80 μm. The thickness ratio between the intermediate layer 2 and the outer layer 3 can be arbitrarily selected according to the mechanical strength required for the yarn 1, but preferably the intermediate layer 2 is 50 to 90% and the outer layer 3 is 10 to 50%. is there. That is, when the fineness of the yarn 1 is 1000 denier, the intermediate layer 2 is 500 to 900 denier and the outer layer 3 is 100 to 500 denier. If the intermediate layer 2 is thicker beyond this range, the mechanical strength and heat-resistant creep characteristics of the yarn 1 are improved, but the outer layer 3 is thinned, so that the film adhesion strength between the intermediate layer 2 and the outer layer 3 and the weave When welding a laminated cloth in which a protective layer is laminated on the cloth, the welding strength is reduced. On the other hand, if the intermediate layer 2 becomes thinner beyond this range, the outer layer 3 becomes thicker, but the mechanical strength and heat-resistant creep properties of the yarn 1 are not improved, although the film adhesion strength and the welding strength are not improved so much. descend.

  Here, the fineness of the yarn 1 can be arbitrarily selected according to the mechanical strength required for the woven fabric using the yarn 1, but considering the productivity of the yarn 1, etc., 500 to 3000 denier is common. 1000 to 2000 denier is more common. Moreover, although the width | variety of the yarn 1 can be arbitrarily selected according to the weave density of a woven fabric, 2-12 mm is common and 4-9 mm is more common.

Figure 2 shows an example of a structure of a woven fabric 4 Ru used in the present invention, the woven fabric 4 is formed by a yarn 1 to be used in the present invention is woven. The woven fabric 4 is sufficient if the yarn 1 is used for at least one of the warp and the weft, and considering the balance of the strength of the woven fabric 4, it is desirable to use it for both the warp and the weft. The woven fabric 4 can be woven in various ways such as plain weave, twill weave, satin weave, and is not particularly limited.

  The weaving density of the woven fabric 4 can be arbitrarily selected according to the mechanical strength required for a product using the woven fabric 4, but is generally about 10 to 20 per inch. Furthermore, it is possible to change the fineness of the warp and the weft, but considering the strength balance of the woven fabric 4, it is common to use the yarn 1 having the same fineness for the warp and the same weave density. .

FIG. 3 shows an example of the structure of the laminated fabric 5 according to the present invention. This laminated fabric 5 is formed by laminating protective layers 6 made of EVA resin on both surfaces of the woven fabric 4. .
The protective layer 6 covers the texture of the woven fabric 4 to prevent intrusion and permeation of foreign matter and moisture, and fixes the texture of the woven fabric 4 to improve the mechanical strength, friction resistance, and the like of the woven fabric 4. Is for. The protective layer 6 is formed by extrusion laminating EVA resin on at least one surface of the woven fabric 4, preferably on both surfaces.
Although the thickness in particular of the protective layer 6 is not restrict | limited, About 20-150 micrometers is common.

In the present invention, the protective layer 6 is formed by extrusion laminating EVA resin on at least one surface of the woven fabric 4 at a temperature immediately below the die of 190 ° C. to 250 ° C.
In the present invention, since the EVA resin is laminated on the surface layer of the yarn 1, it becomes easy to adhere to the molten EVA resin film, and the temperature of the molten EVA resin immediately below the die can be set to be low in this way. At this temperature, EVA is not decomposed, and therefore no foreign matter such as EVA-derived gel or carbide is generated. Therefore, there is no generation of defects such as streaks due to EVA-derived foreign matters during extrusion lamination, and there is no need to disassemble and clean the T-die, so long-term extrusion lamination is possible, and thermal degradation occurs during extrusion lamination. Therefore, the mechanical strength of the woven fabric 4 is not lowered.

In the present invention, at the time of extrusion lamination, a rough surface roll (embossing roll) in which irregularities are formed on the surface of the cooling roll used on one surface of the protective layer 6, or both surfaces, or a rough surface having a matte surface. It is desirable to use a surface roll (mat roll). Such a rough surface roll is manufactured by spraying sand, glass beads, or the like on the surface of a steel roll to form irregularities and chromium plating.
By using such a cooling roll, the unevenness is transferred to the surface of the protective layer 6 made of EVA resin, and is matted into an embossed or matte shape. This embossed surface or mat surface prevents the adjacent EVA resin protective layers 6 from blocking each other when the laminated fabric 5 laminated with the EVA resin protective layer 6 is rolled up.

In the present invention, since a soft texture appears on the surface of the protective layer 6, it is preferable to use a mat roll to make the surface of the protective layer 6 a mat surface. As such a mat roll, specifically, the surface of the cooling roll has a ten-point average roughness described in JIS B 0601-1994 (the radius of curvature of the stylus tip is 2 μm, hereinafter referred to as “Rz”). It is a rough surface roll which is about 10-50 micrometers.
The matte surface gives a soft texture, but the glossy surface has an appearance and a high-class feeling, and the crease is raised and the design is excellent. Therefore, only one surface of the laminated fabric 5 is the mat surface, The surface is preferably a glossy surface. The glossy surface in this case uses a roll (semi-matte roll) having a rough surface to the extent that an appropriate glossy surface is formed between the mat roll and the mirror roll, rather than using a so-called mirror roll with high smoothness. The surface of the EVA resin protective layer 6 is preferably semi-matt. Specifically, such a semi-matt roll is a rough roll having a cooling roll surface Rz of about 0.3 to 0.6 μm.

In the present invention, the protective layer 6 is formed of EVA resin for the following reasons.
In order to extrusion laminate with sufficient film adhesion strength to the woven fabric 4 woven from the single layer HDPE yarn 1, it is necessary to raise the temperature just below the die to 260 ° C. or higher. Simply using EVA resin, Long-term extrusion lamination was not possible due to decomposition. Therefore, if a copolymer of ethylene and acrylic acid, for example, ethylene-methacrylic acid copolymer (EMA), which can set the temperature of the extruded resin relatively high, is used, extrusion lamination can be performed without decomposition. However, there is a problem that a product having excellent physical strength such as wear resistance cannot be obtained. Moreover, it is also disadvantageous in terms of cost.

The EVA resin forming the protective layer 6 preferably has a VA ratio in the range of 5 to 25% by mass, more preferably in the range of 14 to 22% by mass.
When the VA ratio is less than this range, the film adhesive strength is lowered, and the flaking resistance, the high frequency welder suitability and the welding strength may be lowered. If the VA rate exceeds this range, stickiness tends to occur, and blocking may occur when the protective layer 6 is laminated on both sides of the woven fabric 4 and stored as a laminated processed fabric 5 by winding. Moreover, mechanical strength, such as welding strength, may decrease due to a decrease in the cohesive strength of the protective layer 6.

The density of the EVA resin forming the protective layer 6 has a part depending on the VA ratio and is not particularly limited, but the density is in the range of 0.930 to 0.950 g / cm ³ , particularly 0.935 to 0. Those having a range of 945 g / cm ³ are excellent in processability and are suitable. If the density exceeds this range, the VA rate may exceed the above range.
The MFR of the EVA resin forming the protective layer 6 is preferably in the range of 5 to 25 g / 10 minutes, and more preferably in the range of 10 to 20 g / cm ³ .
If the MFR is less than this range, the processability is poor, which may cause inconvenience during extrusion lamination. On the other hand, when the MFR exceeds this range, the neck-in may be large at the time of extrusion lamination, which may be inconvenient.

  The yarn 1 of the present embodiment has a three-layer structure in which the outer layer 3 is laminated on both sides of the intermediate layer 2, but in the present invention, the outermost EVA resin layer is adjacent to the HDPE layer. And may have other layers. Moreover, what was formed by what is called the blocking method which crushes what extruded the film of the two-layer structure or the three-layer structure into the cylinder shape by the co-extrusion method may be used. In such a yarn, the inner layers that overlap each other are blocked and integrated to form a double laminated structure, and such a yarn is also included in the scope of the present invention.

  Furthermore, in the present invention, for the purpose of improving the weather resistance, the yarn 1 and / or the protective layer 6 is provided with an ultraviolet absorber, a polymer stabilizer, an antioxidant, or the like, or for the purpose of imparting flame retardancy. A flame retardant or a flame retardant aid may be blended. In particular, in the present invention, EVA resin can be extrusion-laminated at a temperature just below the die of 190 ° C. to 250 ° C., so that ammonium polyphosphate having a decomposition temperature of around 250 ° C. or less is used as a flame retardant. Therefore, there is no generation of halogen gas that is harmful to the human body even if it is flame retardant.

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
[Example 1]
By coextrusion inflation method, EVA (density = 0.925, MFR = 1.0, melting point = on both sides of the intermediate layer and the intermediate layer of HDPE (density = 0.96, MFR = 0.8, melting point = 133 ° C.) An outer layer having a temperature of 97 ° C. and a VA ratio of 10% by mass was formed into a two-type / three-layer coextruded film. This film was cut with a slitter and then heated and stretched 6 times to prepare a yarn having a fineness of 1000 denier and a width of 6 mm having a constitution of an outer layer having a fineness of 100 denier / an intermediate layer having a fineness of 800 denier / an outer layer having a fineness of 100 denier. .

[Example 2]
A plain woven fabric was prepared using the yarn of Example 1 as warp and weft. The weaving density was 14 pcs / inch for both circumstances.
Example 3
A twill weave was prepared using the yarn of Example 1 as warp and weft. The weaving density was 18 pcs / inch.

Example 4
EVA (density = 0.94, MFR = 15, melting point = 84 ° C., VA rate = 19%) was applied to both surfaces of the woven fabric of Example 2 using a mat roll having a Rz of 29 μm on the surface of the cooling roll. Extrusion lamination was carried out at a thickness of 60 μm and a temperature immediately below the die of 200 ° C. to form a mat-type protective layer on both sides to prepare a laminated fabric.
The obtained laminated fabric was matt on both sides and felt soft.

Example 5
Except for using the mat mat roll of Example 4 and a semi mat roll having a Rz of 0.5 μm on the surface of the cooling roll, extrusion lamination was performed in the same manner as in Example 4, and a mat-like protective layer on one side, A laminated fabric was prepared by forming a semi-matt protective layer on the surface.
The obtained laminated fabric had a matte surface on one side and a glossy surface on one side, and the matte surface had a soft feel and the texture pattern was inconspicuous. On the other hand, the glossy surface has a calm luster and a moist feeling, and the texture pattern is conspicuous.

[Comparative Example 1]
A single layer film was prepared by the inflation method using the HDPE of Example 1. This film was cut with a slitter and then heated and stretched 6 times to prepare a yarn having a fineness of 1000 denier and a width of 6 mm. Using the obtained yarn as warp and weft, a plain woven fabric having a weaving density of 14 wefts / inch was prepared. Except that this woven fabric was used, a laminated fabric was prepared by extrusion lamination in the same manner as in Example 4.
[Comparative Example 2]
A laminated fabric was prepared in the same manner as in Comparative Example 1 except that the resin temperature immediately below the die was 260 ° C. and extrusion laminated.

The extrusion laminate continuous processability in Examples 4 and 5 and Comparative Examples 1 and 2 and the influence on the extrusion laminator were visually observed, and the film adhesion strength was observed by the following method. The results are shown in Table 1.
[Weld strength test to confirm film adhesion strength]
Two 300mm square laminated fabrics are stacked, one end of which is 10mm wide and 275mm long, using Yamamoto Vinita's high frequency welder YTO-5 (5KW), applying an automatic tuning system, current value 0.36A, crimping A high frequency welder was welded under the conditions of a time of 2.5 seconds and a cooling time of 2.0 seconds. The welding strength was confirmed by whether the free end was pulled with both hands to determine whether or not peeling was possible, and the peeled surface after peeling was visually observed.

  From Table 1, although the comparative example 2 produced the malfunction considered to be due to the thermal decomposition of EVA from the time of processing about 2000 m, Examples 4, 5 and Comparative Example 1 could be processed without abnormality even in continuous processing of 6000 m. Regarding the influence on the extrusion laminator, Comparative Example 2 was forced to disassemble and clean the extruder and T-die after processing, while Examples 4 and 5 and Comparative Example 1 had no problem. This shows that according to the method for producing a laminated fabric of the present invention, a high-quality laminated fabric made of EVA resin can be produced efficiently and continuously.

  In addition, the welding strength itself was the strongest in Examples 4 and 5, followed by Comparative Example 2 and was inferior to Comparative Example 1. The peeled surface of Comparative Example 1 has the protective layer of one of the laminated fabrics stretched and broken, and is peeled off by the protective layer of the other laminated fabric, so that the broken pieces of the protective layer remain on the woven fabric. Therefore, the force required to peel off the protective layer from the woven fabric (that is, the film adhesion strength between the woven fabric and the protective layer) must not be greater than the force required to break the protective layer (breaking strength). I understand. As a result, the film bonding strength does not contribute to the welding strength, and only the breaking strength of the protective layer contributes to the welding strength, so that the welding strength is small. On the other hand, the peeling surfaces of Examples 4 and 5 were peeled off at a stretch because the membrane bond strength between the woven fabric and the protective layer was high because many small broken pieces of the protective layer remained on the woven fabric of both laminated fabrics. No, the peeling proceeds while partially breaking the protective film, and both the film adhesion strength and the breaking strength of the protective layer contribute to the welding strength, so the welding strength is high. The peel surface of Comparative Example 2 is the same as in Examples 4 and 5, and the protective layer is extruded and laminated at a high temperature. Therefore, the film adhesion strength between the woven fabric and the protective layer is higher than that of Comparative Example 1, and welding is performed. Although the strength is high, since the outer layer of EVA resin is not laminated on the yarn, it is lower than those in Examples 4 and 5.

  INDUSTRIAL APPLICABILITY The present invention is used for a laminated sheet such as a waterproof sheet for avoiding moisture such as rain, a covering sheet for building materials, a concrete curing sheet, or a box cover for protecting an article on a flexible container or pallet from rain or dust. be able to.

It is a cross-sectional view showing an example of a structure of a yarn Ru used in the present invention. Is a plan view showing an example of a structure of a woven fabric Ru used in the present invention. It is sectional drawing which shows the example of the structure of the laminated work cloth which concerns on this invention.

Explanation of symbols

1 Yarn (Multilayer Stretched Tape)
2 Intermediate layer 3 Outer layer 4 Woven fabric 5 Laminated fabric 6 Protective layer

Claims (4)

A laminated fabric made of polyolefin, and an outer layer made of an ethylene-vinyl acetate copolymer resin having a vinyl acetate group content of 3% by mass to 20% by mass is laminated on both surfaces of an intermediate layer made of high-density polyethylene. Further , an ethylene-acetic acid having a vinyl acetate group content of 5% by mass to 25% by mass on both surfaces of a woven fabric in which a multilayer stretched tape obtained by stretching a laminate having at least a three-layer structure is used for warp and / or weft A laminated fabric characterized in that a protective layer is formed by extrusion lamination of a vinyl copolymer resin. The laminated fabric according to claim 1 , wherein at least one of the protective layers is matte-matted. An outer layer made of an ethylene-vinyl acetate copolymer resin having a vinyl acetate group content of 3% by mass to 20% by mass on both surfaces of an intermediate layer made of high-density polyethylene. A multilayer stretched tape obtained by stretching a laminate having at least a three-layer structure in which a vinyl acetate group content is 5% by mass to 25% by mass on both sides of a woven fabric used for warp and / or weft A method for producing a laminated fabric, characterized in that an ethylene-vinyl acetate copolymer resin is extruded and laminated at a temperature immediately below a die of 190 ° C. to 250 ° C. to form a protective layer . 4. The method for producing a laminated fabric according to claim 3 , wherein the cooling roll used on at least one surface in extrusion lamination is a mat roll.

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