JPS6078732A - Laminated cloth - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a laminate cloth, and more particularly.

10-70% by weight of polyethylene and 90-90% by weight of polypropylene
The base material is a mesh fabric whose warp and/or weft are flat monofilaments made by embossing highly drawn filaments of a resin composition consisting of 30 M and 1%, and a thermoplastic synthetic resin is applied to the surface or front and back surfaces of the base material. Regarding the laminate cloth formed with a coating, more specifically, the mesh fabric has a mesh spacing (d,) in the longitudinal direction with respect to the long axis diameter (r, ) of the weft flat monofilament (d, ≧0.2r1. The present invention relates to a laminate cloth whose base material is a mesh fabric in which the lateral mesh spacing (d2) satisfies d2≧0.2r2 with respect to the warp flat monofilament major axis diameter (r2).

The structure and effects of the laminate cloth of the present invention will be explained below while appropriately comparing with the prior art.

Flat monofilaments are used for the warp and weft of the mesh fabric of the present invention. This filament is polyethylene 1
It is made by embossing a highly drawn thread of a resin composition consisting of 70% by weight of polypropylene and 90-50% by weight of polypropylene.

Conventional laminated cloth is generally obtained by laminating a polyolefin resin on the surface of a fabric made by weaving flat yarns of thermoplastic synthetic resin such as polyethylene or polypropylene. However, in this laminated cloth, flat yarn of 1000 to 1'500 denier with %6 to 7 rfJ is generally used as the raw yarn of the base fabric, and the warp and yarn are used for strength and to prevent misalignment. The weft threads are 8 threads per 1 inch, which is more dense than normal. Therefore, the base fabric does not have a mesh and does not exhibit the so-called bridging effect, which causes problems in the adhesion between the base fabric and the laminate layer. For example, when using polypropylene (Pp
) There are wide restrictions on the base fabric resin material and laminate resin material, such as not being able to attach a polyethylene (PE) laminate layer to the base fabric, and for example, PP, Il; In this case, the molding method and molding conditions are subject to significant restrictions, such as the need to laminate at a high temperature of 280°C to 500°C.

Furthermore, problems such as deterioration of the base fabric due to this were also observed.

Furthermore, various sacrifices have been made to the adhesiveness between the base fabric and the laminate layer, such as the need to perform adhesive treatment such as anchor coating treatment.

For this reason, it has been considered to reduce the fineness of the raw yarn used, or to construct the mesh as a coarsely implanted base fabric, such as by implanting 5 to 6 warp yarns/1 nch, but this would result in a large amount of strength. The width of the film deteriorated significantly, making it unsuitable for use as an industrial material.

On the other hand, the strength of the above laminate cloth is generally 50 to 10
0ky151) Is, and in order to increase the strength further, it is possible to increase the fabric weight by increasing the fineness of the flat yarn of the base fabric, increasing the weaving density, etc., but this will cause problems in weaving workability. For example, pp flat yarn (15
00 denier) implant density 14 x 14 pieces/1n
ch, strength 130~ even when using a base fabric with a grain size of 1909/m2
The limit was 140kIj15m.

Therefore, most of the strength of laminate cloth is determined by the strength of the base fabric, and the flat yarns that make up the base fabric are generally 5 to 677/el, and when woven, the strength of the flat yarn is 3 to 411/el due to weaving deterioration. el, and the base fabric strength is, for example, 10
00 denier, number of implants 10x10/1nch, weight 909/m2 base fabric weighs 60 to 80 kg/5 tatami.

Therefore, various forming force methods and resins were investigated for the purpose of producing a 1-strength amplifier, and a high-drawn flat yarn of 8 to 10,9/a was developed, but the weave deteriorated severely, and after weaving, the
The strength of the base fabric was significantly reduced to ~59/el level, and no fabric with significantly improved strength as a base fabric was obtained.

The present invention uses a mesh fabric made of flat monofilaments as the base fabric that provides most of the strength in laminated cloth, and the flat monofilaments are embossed with highly drawn threads of a resin composition of polyethylene and polypropylene in a specific ratio. use something

Desirably, the resin composition is melt-extruded, strongly stretched at a high temperature to an overstretched state, and then pressed with an embossing roll.

In the present invention, a resin composition of PE and pp.

The reason why a resin composition of a specific ratio, highly stretched, and embossed is used is as follows.

That is, as described above, a flexible monofilament that is microfibrillated is obtained by microscopic phase separation of the PK acid component pp acid component, and the obtained monofilament has a microfibrillated surface state. This is because minute fuzz is generated on the surface, and when this is laminated to the laminate layer, an anchor effect with the laminate layer is generated and the adhesiveness with the laminate layer is improved.

In addition, since the monofilament is pressed with an embossing roll, the surface of the monofilament becomes uneven, which also creates an anchor effect with the laminate layer, and the presence of these unevenness also contributes to preventing the base fabric (cloth) from slipping. This is because it can be done.

By the way, as mentioned above, micro-fibrillated and flexible monofilaments can be obtained through the micro phase separation of the pg acid component and the pp acid component.
If it is not overstretched, the obtained filament will not only have low strength, but also have the problem that the monofilament will be hard.Therefore, there will be a problem in weavability, and the obtained cloth will also be hard.

The present invention uses PE and P as the material for the monofilament, considering its strength (high strength), price, specific gravity (light weight), moldability of high strength monofilament, etc.
A resin composition consisting of p was selected, and the composition ratio of these resins was determined as follows.

That is, if the pg is less than 10% by weight and the pp is more than 90% by weight, it is impossible to stretch at a high magnification, and there is also a problem that it is impossible to stretch and cut the film immediately after stretching whitening, and stable operation in an overstretched state is impossible. . One.

PK70% by weight or more, PP! When the amount is less than 10% by weight, there is a problem in creep property and also in this case, there is a problem in that stable operation in an overstretched state is difficult.

Therefore, the resin composition is [10 to 70%, PP90
~60% by weight preferably 50% by weight to PIC20, pp
It is preferable to set the composition to an overstretched state as described above, and then to embossing it to achieve the above effect.

Further, the PP and PE used for the base fabric of the present invention are not particularly limited, but are preferably isotactic PP with a tag 14 fluff of 496 or higher in terms of strength and creep property, and VF
R is preferably 10 or less (in terms of spinnability and stretchability, MFR is 0.
5 or more is preferable. Also, in PIC, MI is 5 in terms of counterfeiting.
It is preferable to use a material having a density of 0.2 or more in terms of spinnability and drawability, and a density of 0.940117- or more in terms of drawability.

Based on the inventor's diligent studies regarding the above.

Furthermore, it has been found that the chestnut strength can be further improved by blending 30% by weight of EVA, preferably 10-20% by weight.

The stretching ratio during the above-mentioned stretching is selected to be as low as 10 times or more. Also, the preferred temperature range during the stretching is 90°C to 120°C.

A flat monofilament is used as the monofilament constituting the mesh fabric of the present invention. If a thick denier monofilament is used as the monofilament, vacuum bubbles may be introduced during monofilament spinning, resulting in a significant decrease in stretchability and strength. Now, this point will be greatly improved. In addition, flat monofilament has a softer yarn and better weaving properties than circular monofilament (and the flexibility of the obtained base fabric is also good.Furthermore, the base fabric using flat monofilament has a thinner base fabric (because it can be Even if the laminate resin layer is made thinner, there are also advantages such as the surface of the laminate cloth being less uneven.

The flatness ratio of the flat monofilament is 1:2 to 1:10
degree is preferred. In other words, if the aspect ratio is less than 1:2, the effect as a flat monofilament will be small, and if it is more than 1:10, the monofilament will have a large fluctuation over time (this causes problems such as poor drawability and small mesh size, resulting in problems with plastic production). ′
There is also the problem that the ridge effect becomes smaller.

In addition, the flat monofilament has a diameter of 300 denier or more and 60
It is preferable to use one having a denier of 0.00 denier or less. That is, if it is less than 600 denier, there is a problem in terms of strength, and since the thread is too thin, it is too flexible, causing problems such as misalignment during weaving. or.

If the yarn is over 6,000 denier, the yarn becomes too hard, which also poses a problem in weavability, and the resulting cloth is too hard.

In the present invention, it is not a mesh fabric made of monofilaments (if a mesh fabric made of multifilaments is used, there is no problem in adhesion with the laminate layer because it is a mesh fabric, but it is an aggregate of thin filaments, and .

Since the flexible multifilaments are coarsely woven, they are prone to slippage, and although various methods have been proposed to prevent slippage, none have yet been found to be effective.

There is not only a problem with the appearance of the cloth (there is also a problem with variations in cloth strength.Also, when weaving as a multifilament base fabric, the single fibers will fall apart if they are not kept in a sufficient bundle by oiling or heating. This causes problems with weavability.

In the present invention, a mesh fabric in which the flat monofilament obtained as described above is used for one or both of the warp and weft is used as the base fabric (base material). It has been found that it is desirable that the following relationship be established between the mesh spacing in the mesh fabric and the long axis of the filament in terms of the peelability between the base fabric and the two-metal layer due to the effect.

That is, Fig. 1A shows the plane turns of the plain weave mesh fabric base fabric,
In addition, Fig. 1B shows a sectional view taken along the 4X=X line in Fig. 1B, and Fig. 1c shows a sectional view taken along the Y-Y line in Fig. 1A.
It has been found that it is desirable that d1≧0.2 r 1 for , ), and d2≧Q-2r2 for the lateral mesh spacing (d2) for the warp 2 filament major axis diameter (r2).

Therefore, it is preferable to set the strength, fineness, shape, and number of fibers used so that this relationship holds true.

By using the above-mentioned base fabric of the present invention, a highly strong laminate cloth can be obtained, but in order to further improve peelability, welding creep properties, etc., the surface of the base fabric is treated with sandpaper etc. to create a napped appearance. There is no problem in doing so.

In the present invention, the thermoplastic synthetic resin coated on the base fabric is
C may be any material that can be laminated and satisfies various physical properties required as a high-strength laminate cloth.

However, preferably low density polyethylene.

It is preferable to use polyolefin resins such as high density polyethylene and polypropylene.

Particularly preferably, an ethylene vinyl acetate copolymer is used. This makes it possible to perform high-frequency sealing and obtain a highly strong and lightweight laminate cloth.

The vinyl acetate content in the ethylene-vinyl acetate copolymer is not particularly limited, but it is preferably 10% or more from the viewpoint of high-frequency sealing properties, and 25% or less from the viewpoint of blocking moldability. Moreover, M of this ethylene vinyl acetate copolymer (EVA)
The value of FR (fusion index) is particularly limited/may be, but MFR
The lower the value, the better the physical properties such as peel strength. However, if it is too low, there will be problems with coating workability, and from this point of view, MFR1
~20 i/min is preferred.

When laminating EVA onto a conventional flat yarn base fabric, there is a problem that the base fabric and the two-layer one layer cannot be separated.
Although it has not been possible to use EVA with a high vinyl acetate content, this has become possible with the mesh fabric base fabric using the monofilament of the present invention.

Conventionally, when performing high-frequency sealing, it has been considered impossible to use PP or high-density PE, which have a low melting point at the welding temperature, as the base fabric, and polyester, nylon, vinylon, etc. have been used.

However, as a result of intensive studies by the inventors, the vinyl acetate content was 1.
In the case of 25% EVA, it has become clear that the highly drawn filament described in 1 of the present invention can be used as a base fabric to obtain the high strength, lightweight, and high frequency sealable laminate cloth of the present invention. It has been found that it is preferable to use a monofilament mesh fabric made of PE and PP, and to use EVA as a laminating resin for the base fabric.

In the present invention, a small amount of additives such as additives for improving high-frequency sealing properties or chlorinated pg may be mixed into the thermoplastic synthetic resin constituting the coating (also commonly used antioxidants,
Even if pigments, lubricants, etc. are appropriately added, the effects of the present invention are not impaired. The lamination method is not particularly limited, but melt extrusion lamination is preferred, with the melt resin temperature being 220°C in terms of peelability, welding creep properties, and processability.
The temperature is preferably 290° C. or lower in terms of base fabric deterioration and resin deterioration.

Next, one embodiment of the present invention will be explained with reference to examples.

Example-1 MFR5, 51/10 min, Tufty City 9
7.5 of Showa Denko Co., Ltd.'s Aink Kuchitsuku PP Show Aroma-MX201 70 wt% and Mlo, 75 l
/ 10 min, density 0.9521 / am', high density PK Shorex F5007 manufactured by Showa Denko K.K.
A resin composition consisting of 30 wt% M Yoshii Iron Works (
Co., Ltd. 65 m/mφ extruder long axis 6.5% short axis 1785
% oval nozzle 010203C4W D 190℃ 210℃ 250℃ 250℃ 240'C
Melt extrusion at 240°C, air gap 5 (1% water temperature 4
After cooling at 0°C, it was stretched to an overstretched state with a stretching ratio of 12.5 times at a stretching temperature of 100'C using a special wet stretching machine manufactured by Uniplus Co., Ltd., and then a three-stage embossing roll (Miyoshi Co., Ltd.) As a result, there were problems with both spinnability and stretchability (1800 denier, strength 8.5 g/d).
, 1.2% in the filament, and a flattened monofilament with a flattening ratio of 1:4 was obtained.

This flat monofilament is used as warp and weft to weave a plain woven fabric with a woven fabric structure [number of stitches (pieces/1 ncb), etc.] shown in Table 1, and EVA (MFR51/NCB) is applied to both sides of this woven fabric by extrusion lamination. A film with a vinyl acetate content of 15 wt%) was formed.

When we measured the physical properties of this laminate cloth, we found that the first
As shown in the table (good results were obtained).

Example-2 Flat yarn of flat monofilament, woven fabric composition.

A laminate cloth was obtained by spinning flat monofilaments in the same manner as in Example 1, except that the coating thicknesses of gVA and gVA were as shown in Table 1. The results are shown in Table 1.

Example-5 Denier, woven fabric structure and EVA of flat monofilament
A laminate cloth was obtained by spinning in the same manner as in Example 1, except that the coating thickness was as shown in Table 1. Results first
Shown in the table.

Comparative Examples 1 to 3 A plain weave weave with a woven fabric structure as shown in Table 1, using a flat monofilament of 5000 denier and a flatness ratio of 1:8 obtained in the same manner as in Example 1, with the number of stitches 15/1 nch. A cloth was woven in the same manner as in Example 2 (however, IIcVA
A laminate cloth coated with a coating thickness of 250μ was obtained (
Comparative example 1).

Also, for comparison, polypropylene (density 0.9001
/(R5,M,F,R5,!iI/10m1n) was formed into a film by the inflation molding method, and then stretched at a stretching ratio of 7 times, a 3% width, 1500 denier flat yarn was used as the warp and weft. Plain woven fabrics of 15 fibers/1 nch (Comparative Example 2) and 5 fibers/1 nch (Comparative Example 5) were produced, and coated laminate cloths were obtained in the same manner as in Example 1.

When we measured various physical properties of these, we found that as shown in Table 1, when the mensch spacing of the plain weave is small (d = 0.05r2) as in Comparative Example-1, the peel strength and welding strength are poor; -2 (D Yo'lf: In order to obtain strength with a flat yarn woven fabric, a lot of cutting is done (this results in extremely poor peel strength and welding strength. Also, as in Comparative Example-3, peel strength is Improvement (Reducing the number of flat yarns causes a decrease in the tensile strength of the laminate cloth - Comparative Example - 4 Spinning under the same conditions as Example 1 except for the stretching ratio, but at a stretching ratio of 7 times or lower than the overstretched state) And I got a laminate cloth.

The results are shown in Table 1. The weavability was poor (the product was hard), and there were practical problems.

Comparison row-5 Spinning was carried out under the same conditions as in Example 1 except that the nozzle was 2.2%φ22H and no embossing was performed. As a result, the stretching properties were extremely poor due to vacuum bubbles, and the process was discontinued.

Comparative Example-6 Spinning was carried out in the same manner as in Example 1 except that the resin composition was changed to 8 wt% PK and 92+vt% PP, but it could not be drawn.

Comparative Example 7 A siminate cloth was obtained by spinning under the same conditions as in Example 3 except that the resin composition was changed to pgaowt% and PP20wt%. The results are shown in Table 1.

Example 4 Resin composition PP 6wt%, PP20wt%, g V
A (MFR5.9/min, vinyl acetate content 15
A laminate cloth was obtained by spinning in the same manner as in Example 1 except that the fibers were bound to 1"5 wt%. The results are shown in Table 1.

*1) Tensile strength: Based on JIS Z 1651.

Distance between chucks: 9 150 mm Tensile speed: 200 m/min *2) Peel strength: In the manner shown in FIG. 2, a test piece having a welded portion 3 was pulled from the left and right sides, and the peel strength was measured. The measurement conditions are as follows.

Welder width 60II11 Length 30 Distance between chucks 150■ Tensile speed 20011n/min *6] Welding strength: Each sample is welded using a high frequency welder. The measurement conditions are as follows.

Welding cloth 50 Distance between chucks: 150 mm Tensile speed 2001FI/Din

[Brief explanation of drawings]

Figure 1A is a partially cutaway plan view showing an example of the plain weave mesh fabric base fabric used in the present invention, and Figure 1B is Figure 1A
X-ray cross-sectional view, Figure 1c is Figure 1A Y-Y cross-sectional view, Figure 2
The figure is an explanatory diagram of a peel strength test. 1...warp 2 rivers weft dl, d2 thread spacing r 1 r r 2°... filament major axis diameter 3...
Welder Partial Patent Applicant: Showa Denko K.K. Representative Patent Attorney Yoshihiro Sato Figure 1B Figure 1C Figure 2

Claims (1)

[Claims] t 10 to 70% by weight of polyethylene and 9% by weight of polypropylene
The base material is a mesh fabric whose warp and/or weft are flat monofilaments obtained by embossing highly drawn filaments of a resin composition consisting of 0 to 60% by weight, and thermoplastic on the surface or front and back surfaces of the base material. A laminate cloth made of synthetic resin. 2. The mesh fabric has a mesh spacing (dl) in the longitudinal direction relative to the long axis diameter (r) of the weft flat monofilament (r), ≧0.
2 rl, the lateral mesh spacing (d2) is d2≧0-2 r2 with respect to the warp flat monofilament major axis diameter (r2)
The laminate cloth according to claim 1, which is a mesh fabric that satisfies the following. 3. The highly drawn filamentous material is a filamentous material obtained by strongly stretching the resin composition according to claim 1 to a state of overstretching of at least 10 times. The laminate cloth according to claim 1. 4. The flatness ratio of the flat monofilament is 1=2 to 1:1.
It is 0. A laminate cloth according to claim 1. 5. The laminate cloth according to claim 1, wherein the embossing process is performed by pressing a highly drawn filament with an embossing roll, and the process forms irregularities on the surface of the flat monofilament. 6. The thermoplastic synthetic resin is an ethylene vinyl acetate copolymer. A laminate cloth according to claim 1.