JPH02206547A - Laminate sheet - Google Patents

Abstract

PURPOSE:To enhance weatherability and stain resistance and reduce reflection of rays by using a laminate sheet obtained by laminating and pressing a multilayer sheet or film of a thermoplastic resin and a reinforcing woven fabric, as a base fabric for a tent or the like. CONSTITUTION:A laminate sheet (b) comprises thermoplastic fluorine-containing resin layers (A) 2, thermoplastic resin layers (B) 3 not containing fluorine and having a softening temperature lower than that of the layer (A), and a reinforcing woven fabric 4. A heat-resistant porous release paper 6, a multilayer sheet or film 1 with which a surface layer of the fluorine-containing resin layer (A) 2 comes into contact, the reinforcing woven fabric 4, and another multilayer sheet or film 1 of which a surface layer of the resin layer 3 not containing fluorine comes into contact with the woven fabric 4, are laid on a flat platen for lamination 5 in that order, followed by heating and pressure reduction by suction to obtain the laminate sheet (B). The resin layer (B) 3 softened by heating under a reduced pressure penetrates into gaps in the woven fabric 4, and the surface of the laminate sheet (b) rugged according to the shape of the woven fabric 4, thereby reducing reflection of rays.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a laminated sheet used in fields such as tents, preferably arcades, membrane structure architecture, interiors, and the like.

(Prior technology) Tent fabrics widely used in pavilions, storefront tents, arcades, garages, simple warehouses, old play areas at bus stops, etc. are made by combining soft vinyl chloride resin with glass fiber woven fabric or polyester fiber. The mainstream is woven fabric coated. This may have been done from a cost performance perspective, but it is also easy to stain, which is thought to be due to the plasticizer contained in the soft vinyl chloride resin bleeding onto the surface, and devitrification and strength due to the low weather resistance of the resin itself. Due to the rapid progress of deterioration, there is a problem in that the product takes on a shabby appearance after several years of use.

In order to improve this problem, there is a technique in which a fluororesin film containing an ultraviolet absorber and having excellent weather protection and stain resistance is overlaid on a base material.

(Problems to be Solved by the Invention) The surface of the product using the above-mentioned overlay is substantially smooth or nearly smooth, and the reflection of light rays is extremely poor in appearance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a laminated sheet that has excellent weather resistance and stain resistance, and preferably has improved light reflection.

(Means for Solving the Problems) The present invention provides a thermoplastic fluororesin layer (A) on one surface,
The other layer is a fluorine-free thermoplastic resin layer (B) having a softening temperature lower than that of the layer (A), and is composed of a multilayer thermoplastic resin layer consisting of at least the two layers and a reinforcing woven fabric; At least a part of the layer (B) penetrates into at least a part of the texture of the reinforcing woven fabric in the thickness direction,
The present invention also provides a laminated sheet, characterized in that the surface of the layer (A) has an uneven shape that conforms to the texture of the reinforcing fabric.

The laminated sheet of the present invention is obtained by laminating and pressing a thermoplastic resin multilayer sheet or film and a reinforcing woven fabric. More specifically, this multilayer sheet or film of thermoplastic resin has one surface layer as a thermoplastic fluororesin layer, and the other layers as at least one thermoplastic resin layer that does not contain fluorine and has a softening temperature lower than that of the fluororesin. A multilayer sheet or film consisting of at least two layers.

Examples of the thermoplastic fluororesin forming one surface (A) of the multilayer sheet or film include vinyl fluoride resin, vinylidene fluoride resin, ethylene chloride trifluoride resin, ethylene-trifluoroethylene chloride copolymer resin, and ethylene. - Selected from tetrafluoroethylene copolymer resins, etc.
In order to impart excellent weather resistance to the laminated sheet of the present invention, an ultraviolet absorber may be included. As the fluorine-free thermoplastic resin forming the other layer (B) of the multilayer sheet or film, those that can be used in the technical field of the present invention, such as tents, can be widely used, such as vinyl chloride resin, vinylidene chloride resin, It is selected from acrylic resin, vinyl acetate resin, styrene resin, olefin resin, etc. Multilayer sheets or films made of such resins are produced by lamination or coextrusion. Depending on the need,
A multilayer sheet or film is obtained in which a layer of a resin having a common affinity is interposed between a fluororesin layer and a fluorine-free resin layer to increase the bonding strength between the layers.

There are no particular restrictions on the layer structure of the multilayer sheet or film, but two or three layers are commercially realistic. Further, the thickness structure can be arbitrarily selected depending on the purpose and use. It may also vary depending on the specifications of the reinforcing fabric used for lamination.

The total thickness of both layers (A) and (B) is preferably about 150 μm or less, and the fluororesin layer (A) is preferably about 50 μm or less, and more preferably the total thickness is about 50 to 100 μm.
μm and its fluororesin Ji! (A) is about 5-10
It is μm.

The most typical examples of multilayer sheets or films for producing the laminate sheet of the present invention include, schematically, vinyl fluoride resin layer/soft vinyl chloride resin layer, vinylidene fluoride resin layer/acrylic resin layer. Examples include a two-layer film, a three-layer film of vinyl fluoride resin layer/acrylic resin layer/soft vinyl chloride layer, and vinylidene fluoride resin layer/acrylic resin layer/soft vinyl chloride resin layer. Such multilayer sheets or films are flexible and relatively inexpensive;
This is also preferred in terms of increasing the versatility of the laminated sheet of the present invention.

The reinforcing woven fabric constituting the laminated sheet of the present invention has air permeability, heat resistance of about 200°C or higher, tensile strength required for tent fabric, and mesh misalignment during the lamination process. It is an essential condition that such woven fabrics do not produce any of the following: Examples of materials for such woven fabrics include glass fibers, polyester fibers, acrylic fibers, nylon fibers, aramid fibers, and carbon fibers. Further, examples of preferable textiles include plain weave, twill weave, and leno weave. Among these, glass fiber woven fabrics and polyester fiber woven fabrics, which are commonly used for tent fabrics, are particularly preferred.

The multilayer sheet or film and the reinforcing woven fabric can be laminated, for example, by a method applying the principle disclosed in Japanese Patent Publication No. 52-16470 (method for manufacturing laminate products). Specifically, for example, as shown in FIG. 1(a), a heat-resistant porous release paper 6 is arranged on a lamination flat plate 5, which is a mechanically and thermally robust perforated plate having dense pores. Then, the multilayer sheet or film 1 is arranged so that the surface layer 2 made of fluororesin is in contact with the release paper 6, and then the reinforcing fabric 4 is arranged, and then the surface layer 2 made of fluororesin is arranged so that it is in contact with the release paper 6. The surface layer 3 consisting of the above-mentioned reinforcing fabric is layered in order with another multilayer sheet or film arranged so as to be in contact with the reinforcing fabric, and the resin layer in contact with the reinforcing fabric is heated to a temperature at which the resin layer in contact with the reinforcing fabric softens while vacuum suction is applied across a release paper. , to obtain the laminated sheet of the present invention.

When producing a laminated sheet coated with fluororesin on only one side, one multilayer sheet or film arranged between the release paper and the reinforcing fabric can be omitted in the above process (see Figure 2 (C). ), see (d)).

The laminated sheet obtained by the coordination structure and process described above has one surface where the surface layer (A) made of fluororesin is coordinated is reinforced as shown in FIG. 1(b) and FIG. 2(d), for example. It has an uneven shape that conforms to the woven surface shape of the woven fabric, and is not at least smooth. The degree of unevenness can also be changed depending on the purpose. However, it is preferable that at least such a surface shape reduces reflection of light rays or softens transmitted light rays. The fluorine-free thermoplastic resin layer (B), which is laminated in contact with the reinforcing fabric and heated under reduced pressure, softens and penetrates at least part of the gaps between the weaves of the reinforcing fabric. At least some of the gaps or fibers over the entire surface of the reinforcing woven fabric are filled by the softened resin layer (B). The preferred form is No. 1.2.
As shown in the figure, the resin layer (B) covers the entire surface of the reinforcing woven fabric, and the resin layer (B) covers the entire surface of the reinforcing woven fabric in the thickness direction of the weave.
It is in a state where the weave is filled in. Therefore, the multilayer sheet or film and the reinforcing fabric form a strong bond due to the anchoring effect.

It is also preferable that the (B) layer enters through the holes on both sides of the reinforcing fabric and adheres to each other as shown in FIG. 1. The laminated sheet of the present invention, which preferably has the above-mentioned appearance characteristics in addition to weather resistance and stain resistance, is preferable because it exhibits excellent properties not only for general tents but also particularly for fields such as pavilions, eaves tents, and arcades. It is something.

(Example) The lamination device used in the following examples has a flat plate with many pores, a supporting structure that does not distort the flat plate even under a pressure of 1 kg/aflG, and a suction system common to all pores. It is a flat iron box with a built-in taxiway and electric heater for heating. Hereinafter referred to as a flat plate.

Further, a silicone-coated porous paper was used as a release paper.

Example 1 A multilayer film was produced by coextrusion: about 5 μm thick vinylidene fluoride resin N containing an ultraviolet absorber / about 10 μm thick acrylic resin layer / about 35 μm thick soft vinyl chloride resin layer (dioctyl phthalate) A glass fiber woven fabric (manufactured by Asahi Schneebel, plain weave, strand density: 32 strands/in x 30 strands/in, thickness 0) was used as a reinforcing woven fabric.
．． 28ml11) was used.

Prepare and heat to approximately 160°C, then place release paper on a flat plate, a multilayer film with an area slightly smaller than the reinforcing fabric (with the fluororesin layer side in contact with the release paper), reinforcing fabric, and reinforcing fabric. Layer the multilayer film with a slightly larger area (with the fluororesin layer side outside) in order, and set the degree of vacuum on the release paper side to about 500 mm.
) Ig for approximately 3 minutes.

One surface of the finished laminated sheet had an uneven shape that conformed to the shape of the back surface of the reinforcing fabric, and the other surface was smooth. This uneven surface had little shine, and the pure white woven glass fiber cloth stood out clearly. The light transmission also gave a peaceful anger. In addition, no exposure of the reinforcing fabric was observed on both sides, and the coating resin layer was firmly adhered to the extent that it could be torn off at the intersection of the strands of the reinforcing fabric when it was forcibly peeled off.

Example 2 The lamination conditions of Example 1 were followed except that the multilayer film in contact with the release paper was omitted and the temperature of the flat plate was set to about 180°C.

The unevenness on one surface of the laminated sheet was deeper than that of the laminated sheet of Example 1, and the resin layer in contact with the reinforcing woven fabric went around to the back side of the woven fabric. The appearance was similar to the laminated sheet of Example 1.

Example 3 A two-layer film made by coextrusion as a multilayer film consisting of vinylidene fluoride resin N containing an ultraviolet absorber with a thickness of approximately 5 μm/an acrylic resin layer with a thickness of approximately 50 μm was used to control the temperature of a flat plate. The lamination conditions of Example 1 were followed except that the temperature was about 180°C.

Both the surface appearance of the laminated sheet and the bonding strength between the multilayer film and the reinforcing fabric were similar to those of the laminated sheet of Example 1 and were excellent.

Example 4 A fluorinated vinyl resin film containing an ultraviolet absorber and having a thickness of about 12 μm (manufactured by DuPont, trade name: Tetra Film, grade with adhesive properties on one side) and a film having a thickness of about 50 μm
Lamination was carried out according to the lamination conditions of Example 1, except that a two-layer film hot-laminated with soft vinyl chloride (containing 50 PHR of dioctyl phthalate) was used.

The properties of the laminated sheet were similar to those of Example 1.

Example 5 An ethylene-tetrafluoroethylene copolymer resin film with a thickness of about 6 μm (manufactured by Asahi Glass Co., Ltd., trade name Afflex, Clade with adhesive properties on one side) and a soft vinyl chloride film with a thickness of about 50 μm (dioctyl phthalate 50 PHR) were used. Lamination was carried out according to the lamination conditions of Example I, except that a two-layer film hot-laminated with (including) was used.

The properties of the laminated sheet were similar to those of Example 1.

(Effects of the Invention) The laminated sheet of the present invention has excellent weather resistance and stain resistance, and preferably has a beautiful uneven surface shape with little reflection of light. It also has far superior properties in common application fields with conventional laminated sheets.

[Brief explanation of the drawing]

Figure 1.2 shows an example of the invention. FIGS. 1(a) and 1(b) are schematic diagrams of the manufacturing process of a laminated sheet having thermoplastic fluororesin layers on both surfaces. FIGS. 2(C) and 2(d) are schematic diagrams of the manufacturing process of the laminated sheet (d) having a thermoplastic fluororesin layer on only one surface. DESCRIPTION OF SYMBOLS 1... Multilayer sheet or film, 2... Thermoplastic fluororesin layer (A), 3... Thermoplastic resin N (B) that does not contain fluorine, 4... Reinforced woven fabric, 5... - Lamination plate, 6...Release paper Figure 1 (a) (b) Patent applicant Asahi Kasei Corporation Figure 2

Claims (1)

[Claims] One surface layer is a thermoplastic fluororesin layer (A), and the other layer is a fluorine-free thermoplastic resin layer (B) having a lower softening temperature than the layer (A), a multilayer consisting of at least the above two layers. Consisting of a thermoplastic resin layer and a reinforcing woven fabric, at least a part of the (B) layer penetrates into at least a part of the thickness direction of the reinforcing woven fabric over the entire surface of the weave of the reinforcing woven fabric, and A laminated sheet characterized by a surface having an uneven shape that conforms to the texture of the reinforcing fabric.