JP2761967B2 - Fluororesin sheet material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fluororesin sheet material obtained by providing a woven fabric with a fluororesin layer.

[Summary of the Invention]

The present invention provides a fluororesin layer on at least one surface of the woven fabric, and the fluororesin layer contains a filler and has light reflectivity, thereby providing a desired light reflectance and light transmittance. This is a fluororesin sheet material as described above.

[Conventional technology]

Fluororesin sheet material formed by forming a fluororesin layer made of polytetrafluoroethylene etc. on a woven fabric made of glass fiber etc. has excellent chemical stability and weather resistance, and has extremely little deterioration over time. Roofing materials (for example, roofing materials and tent materials for indoor baseball fields), release sheets and belt materials for conveyors.

Glass fabric (fluorine resin sheet) with a high translucency by coating a glass woven fabric with a mixture of tetrafluoroethylene and glass beads as an architectural sheet material to sufficiently incorporate natural light into buildings Materials) are known. (For example, JP-A-49-113496,
Further, a light brown sheet made of fluororesin is used as the release sheet material, and a black sheet made of fluororesin filled with graphite or the like for improving abrasion resistance is used as the belt material. Actually used respectively.

[Problems to be solved by the invention]

However, when a fluororesin sheet material with improved translucency as described above is used as a roofing material, in some cases, the temperature inside the building may rise excessively, making it difficult to control the indoor temperature. There was a problem that the cost of the temperature control equipment was too high.

In addition, the conventional fluororesin sheet material has the same color on both sides and is monotonous with no change in color or color tone and pattern, irrespective of its excellent physical, chemical and electrical properties, Its use was limited.

In particular, architectural materials having various patterns or changing colors or color tones are demanded from the requirements of the appearance and design of the building, and the sheet material made of fluororesin is no exception.

An object of the present invention is to provide a fluororesin sheet material having desired transmittance, reflectance, and desired pattern, color, and color tone according to the intended use.

[Means for solving the problem]

In order to achieve the above object, the fluororesin sheet material of the present invention is provided with a fluororesin layer on at least one surface of a woven fabric made of organic fibers and / or inorganic fibers,
This fluororesin layer is characterized by having light reflectivity by containing a reflective filler.

The filler may be any one that has reflectivity, and is preferably a reflective pigment such as metal powder or metal foil, or a reflective inorganic filler such as mica or silica.

The fluororesin layer may further include a coloring pigment, whereby a desired color and / or color tone can be obtained.

In addition, a first filler containing the above filler as a first filler.
Can be provided on one surface of the woven fabric, and a second fluorine resin layer containing a second filler can be further provided on one surface or the other surface.

The first and second fillers can be different in type and / or content, respectively. If the second fluororesin layer contains at least a coloring pigment, a desired color and / or tone can be obtained. Note that a second fluororesin layer may be provided on the first fluororesin layer, or vice versa.

On one surface and / or the other surface of the sheet material provided with the first and second fluororesin layers, a third filler containing, for example, a reflective pigment and / or a color pigment is contained. Third fluororesin layer may be further provided.

As described above, for example, when a colored fluororesin layer is provided on a reflective fluororesin layer, the color tone of the colored fluororesin layer is emphasized.

Further, when the second filler is made of, for example, glass beads or glass bubbles, the second fluororesin layer can have a light-transmitting property, and the second fluororesin layer and the reflective material having the reflectivity can be provided. By combining with the first and / or third fluororesin layer, a sheet material having a predetermined anti-emissivity can be constituted without significantly lowering the light transmittance.

In addition, the content and / or type of the first, second, and third fillers and / or the thickness of each of the fluororesin layers may be varied and variously combined to form one surface of the sheet material. The color and / or tone can be different from the other surface, and the sheet material can have a light reflectance of 5 to 95% and a light transmittance of 0 to 25%.

Further, the first, second or third fluororesin layer may be partially provided to form a predetermined pattern on at least one surface of the sheet material.

The woven fabric may be made of one of organic fibers and inorganic fibers or a mixture of both, but a woven fabric made of glass fibers is preferable in terms of strength and light transmission.

Further, as the fluororesin, polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer , Tetrafluoroethylene-ethylene copolymer, tetrafluoroethylene-hexafluoropropylene-perfluoroalkylvinyl ether copolymer, chlorotrifluoroethylene-ethylene copolymer, used alone or as a mixture of two or more. Can be.

Examples of the reflective pigment constituting the reflective filler include aluminum powder, nickel powder, platinum powder, gold powder, silver powder, copper powder, and stainless steel flakes (which are closer to powder than foil). Known metal pigments composed of such metal powders or known metal foil pigments such as aluminum foil, nickel foil, platinum foil, stainless steel foil, gold foil, silver foil, alloy foils such as copper foil and brass, and the like.

The above metal pigments and metal foil pigments can be used alone or in combination of two or more. According to the metal pigment and the metal foil pigment as described above, for example, gold,
When copper, brass, or the like is used, a golden sheet material can be used, and when aluminum is used, a silver sheet material can be used, and a desired reflectance can be obtained.

Further, as the reflective filler, a known inorganic filler having reflectivity may be used. For example, mica, silica, calcium carbonate, calcium pyrophosphate, aluminum oxide (alumina), calcium hydroxide, calcium phosphate, aluminum hydroxide, potassium titanate, silicon nitride whisker, alumina whisker, silicon carbide whisker, potassium titanate whisker, glass fiber Can be mentioned.

In addition, since the content of the various whiskers or glass fibers described above contributes to the improvement of the strength of the sheet material, it is advantageous when the strength of the sheet material is particularly required.

Further, as the above-mentioned reflective filler, a material obtained by subjecting glass bubbles or glass beads to metal plating such as nickel plating may be used.

The content of the above-mentioned reflective filler in the fluororesin is appropriately determined so that the reflectance of the sheet material has a desired value, and is preferably in the range of 0.1 to 30% by weight.

Further, as the coloring pigment, known inorganic pigments, organic pigments or dyes can be used.

Examples of the inorganic pigment include oxides of various metals, sulfides, sulfates, and the like.For example, ferric oxide, titanium oxide, zinc oxide, nickel oxide, antimony oxide, chromium oxide, silicon oxide, cobalt oxide, cadmium sulfide, Selenium sulfide, barium sulfate, lead chromate, cobalt phosphate, cobalt borate, lead carbonate, zirconium oxide, chromate,
Carbon black can be mentioned.

As the organic pigment, a phthalone anine-based organic pigment,
Examples include quinacridone-based organic pigments, benzidine-based organic pigments, and lake pigments.

Examples of the dye include an azo dye, an anthraquinone dye, a thioindigo dye, a quinoline dye and an indanthrene dye.

In addition, known inorganic fillers and organic fillers may be used as the coloring pigment. As the inorganic filler, molybdenum disulfide, calcium silicate, bronze, talc,
Examples include clay, sericite, graphite (graphite), graphite fluoride, and the like. Further, as the organic filler, aromatic polyamide, aromatic polyimide, aromatic polyamideimide, polyphenylene sulfide, polyether ether ketone, polyether sulfone, polyether ketone, aromatic polyester, thermotropic liquid crystal polymer, lyotropic liquid crystal Polymers.

The various color pigments as described above can be appropriately selected according to a desired color and / or color tone.

Each of the above-mentioned fluororesin layers can be formed by laminating a plurality of thin layers, and can have a predetermined thickness. Also, by appropriately selecting the thickness, the light reflectance and light transmittance of the sheet material can be changed. For example, according to a sheet material in which a fluororesin layer having reflectivity is formed thinner, a predetermined reflectance can be obtained without extremely reducing the light transmittance.

In addition, the sheet material may be provided with an arbitrary number of layers of a fluororesin layer containing the above-described filler as needed, but corrosion of the contained filler becomes a problem. In this case, the outermost layer of the sheet material is preferably a fluororesin layer containing no filler. Alternatively, when the outermost layer contains a filler, it is preferable to select a filler that can withstand such corrosion.

Also, a fluororesin layer containing no filler is formed on both sides of the woven fabric in advance by a coating method, a dipping method, or the like,
An aqueous suspension or enamel containing the filler and / or the coloring pigment is applied thereto by a roll coater method or a spraying method, dried, and fired at 350 ° C. or more, whereby the fluororesin sheet material is obtained. Can be manufactured.

In this case, the above metal powder and metal foil, etc.
It is preferable that the viscosity of the suspension is adjusted to about 20 cp to 4000 cp by adding a thickener to the suspension, since the suspension is likely to precipitate and the dispersion tends to be uneven in the aqueous suspension.

Further, in the specification of the present application, color refers to perceived color, and color tone is an attribute of color perception when two factors of saturation (saturation) and lightness are considered at the same time (“Light Glossary”, p100- Ten
1, issued on November 30, 1981, Ohmsha).

[Action]

The fluororesin layer containing a reflective filler provided on at least one surface of the woven fabric has reflectivity, and the content of the filler can be arbitrarily changed. Therefore, in the fluororesin sheet material, desired light reflectance and light transmittance can be obtained.

〔Example〕

Hereinafter, Reference Examples 1 to 8, 12 to 15, and Example 9 according to the present invention.
11 will be described with reference to FIGS. 1 to 5B.

REFERENCE EXAMPLE 1 As shown in FIG. 1, the fluororesin sheet material of Reference Example 1 is provided with a fluororesin layer 3 containing a reflective filler only on one side of a glass woven fabric 1. This fluororesin sheet material was obtained as follows.

That is, the glass woven fabric 1 composed of the weft 1a and the warp 1b
(Product name: Nittobo Glass Fiber, manufactured by Nittobo Co., Ltd.)
Was coated with a polytetrafluoroethylene suspension to which no filler was added (trade name: Fluon AD-1, manufactured by Asahi Glass Co., Ltd.). Thus, the base material 5 was prepared by providing the fluororesin layers 2a and 2b containing no filler on both surfaces of the glass woven fabric 1, respectively.

Next, a polytetrafluoroethylene suspension mixed with 10% by weight of mica (trade name: mica powder, manufactured by Dainichi Seika Kogyo Co., Ltd.) as a reflective filler was added to the fluororesin layer 2a of the base material 5 described above. On top. This fluororesin sheet material was dried and fired at a temperature of 400 ° C.

As a result, a fluororesin sheet material provided with the fluororesin layer 3 having reflectivity was obtained. The fluororesin layer 3 was formed by a plurality of coatings and laminated in a plurality of layers, and the total thickness was about 20 μm.

Reference Example 2 Reference Example 2 is a fluororesin sheet material obtained in the same manner as in Reference Example 1 except that the filler was 25% by weight of stainless steel foil.

Reference Example 3 Reference Example 3 is a fluororesin sheet material obtained in the same manner as in Reference Example 1 except that the filler was 20% by weight of nickel powder.

The results of measuring the light reflectance and light transmittance of the fluororesin sheet materials of Reference Examples 1 to 3 above are shown in Table 1 below. In this measurement, light is incident on the sheet material from above in FIG. The color of the sheet material is also shown.

In addition, in the said reference examples 1-3, the filling amount of each filler can be changed in the range shown in the following Table 2, and thereby the light reflectance and the light transmittance in the range shown in the table can be freely obtained. be able to.

REFERENCE EXAMPLE 4 As shown in FIG. 2, the fluororesin sheet material of Reference Example 4 is provided with first and second fluororesin layers 11 and 12 containing a predetermined filler on one surface of a glass woven fabric 1. It is a thing.
This fluororesin sheet material was prepared in the same manner as in Reference Example 1 except for the following, using the same base material 5 as in Reference Example 1.

That is, graphite 5% by weight as the first filler
Was applied onto the fluororesin layer 2a. Thus, the first fluororesin layer 11 colored black was formed.

Next, a polytetrafluoroethylene suspension mixed with 25% by weight of mica as a second filler was applied on the first fluororesin layer 11. Thus, the second fluororesin layer 12 having reflectivity was formed.

Reference Example 5 A reference example 5 is a fluororesin sheet material obtained in the same manner as in Reference Example 4 except that the first filler is 25% by weight of mica and the second filler is 1% by weight of graphite. It is.

Reference Example 6 Reference Example 6 is the same as Reference Example 4 except that the first filler is 2% by weight of cadmium sulfide (for yellow coloring) and the second filler is 5% by weight of stainless steel foil (for light reflection). This is a fluororesin sheet material obtained in the same manner as in the above.

Reference Example 7 Reference Example 7 is a fluororesin made in the same manner as in Reference Example 4 except that the first filler was 10% by weight of stainless steel foil and the second filler was 2% by weight of cadmium sulfide. It is a sheet material.

Reference Example 8 Reference Example 8 has the same structure as that shown in FIG. 1 except that 10% by weight of alumina as the first filler and 1% by weight of carbon black as the second filler were mixed. The polytetrafluoroethylene suspension is applied on the fluororesin layer 2a. In this way, a fluororesin sheet material having the fluororesin layer 3 colored with black and having reflectivity was obtained.

The light reflectance and light transmittance of the fluororesin sheet materials of Reference Examples 4 to 8 were measured in the same manner as in Reference Examples 1 to 3. The results are shown in Table 3 below. In the table, parentheses indicate preferred ranges of the respective fillers and respective ranges of the light reflectance and the light transmittance obtained thereby.

The thickness of the first and second fluororesin layers 11 is about 1 to 100 μm.

Comparing Reference Example 4 and Reference Example 5 described above, Reference Example 4
The first fluororesin layer 11 is colored black and the second fluororesin layer 12 has reflectivity. When the surface of this sheet material is viewed from above in FIG. The entire surface looks silver-black. On the other hand, the first fluororesin layer 11 of Reference Example 5 has reflectivity,
Since the second fluororesin layer 12 is colored black, its surface looks black, and the light reflectance is lower than that of the sheet material of Reference Example 4.

Further, the first fluororesin layer 11 of Reference Example 6 is colored yellow, and the second fluororesin layer 12 has reflectivity. On the other hand, the first and second fluororesin layers 1 of Reference Example 7
1 and 12 are the reverse of the case of Reference Example 6, in which the reflective layer 11 is provided below the yellow-colored layer 12, so that yellow is emphasized due to light reflection in the layer 11 and its color tone is This is different from the case of Reference Example 6. The light reflectance in the case of Reference Example 7 is the same as in Reference Example 6.
Lower than.

Further, in Reference Example 8, a first filler for obtaining reflectivity and a second filler for coloring are simultaneously contained in the same fluororesin layer. The light reflectance obtained by this means that when the content of the first filler and the second filler is constant, the first fluororesin layer 11 has reflectivity and the second fluororesin layer 12 has The light reflectance of the colored sheet material and the light reflectance of the sheet material having the reverse configuration in this case are substantially intermediate values.

As described above, by providing a fluororesin layer having reflectivity on a colored fluororesin or under the fluororesin, the light reflectance of the sheet material can be changed and the color tone can be changed. Can also be changed.

Example 9 As shown in FIG. 3, the fluororesin sheet material of Example 9 contains a third filler on the fluororesin layer 2b side of the base material 5 of the sheet material having the structure shown in FIG. This is a structure in which a third fluororesin layer 13 is provided.

This sheet material contains 10% by weight of mica as the first filler.
First fluororesin layer that is a layer for reflection containing
11 and a second fluororesin layer 12, which is a coloring layer containing 1% by weight of cadmium sulfide as a second filler. Then, a polytetrafluoroethylene suspension mixed with 2% by weight of cobalt blue for coloring blue as a third filler was applied to the fluororesin layer 2b. Thus, a third fluororesin layer 13 was formed.

According to the ninth embodiment, when the surface is viewed from above in FIG. 3, it looks yellow, and when viewed from below in FIG. 3, it looks blue, and the first fluororesin layer 11 has a predetermined reflectance. be able to.

Note that the first filler and the second filler may be mixed to form a fluororesin layer containing both fillers instead of the first and second fluororesin layers.

Example 10 Example 10 was obtained in the same manner as in Example 9 except that a third fluororesin layer 13 containing 2% by weight of cobalt blue and 3% by weight of stainless steel foil as a third filler was provided. Sheet material made of fluororesin.

This fluororesin layer 13 is not only colored blue but also has reflectivity.

When the sheet material of Example 10 is used as, for example, a roof material of a building, it has a predetermined reflectance to external light and has a predetermined reflectance to lighting means provided inside the building. Therefore, the inside of the building can be illuminated more brightly, and a heat retaining effect can be obtained. This makes it possible to reduce the energy for lighting and for adjusting the air temperature.

Note that, in this case, the third fluororesin layer may be formed separately from the layer having reflectivity and the colored layer without mixing the two fillers.

Embodiment 11 Embodiment 11 has the same structure as that shown in FIG.
Glass beads and 5% by weight of glass bubbles were mixed with the polytetrafluoroethylene suspension and applied to both surfaces of a glass woven fabric to form fluororesin layers 2a and 2b. On such a fluororesin layer 2a, brass powder 5 is used as a reflective filler.
The fluororesin sheet material was obtained by forming the fluororesin layer 3 containing by weight.

When the light reflectance and the light transmittance of this sheet material were measured in the same manner as described above, the light reflectance was 40% and the light transmittance was 15%. At this time, light enters the sheet material from below in FIG.

In addition, the content of glass bubbles or glass beads is 1
If it is changed in the range of 1515% by weight and the reflective filler is changed in the range of 1 to 30% by weight, the light reflectance of 5 to 95% and the
% Sheet material can be obtained.

According to the sheet material of Example 11, the fluororesin layer 2a,
Since 2b contains glass beads and glass bubbles as a filler for enhancing the translucency, a predetermined light reflectance can be obtained without significantly reducing the light transmittance of the sheet material.

Reference Example 12 As shown in FIG. 4, the fluororesin sheet material of Reference Example 12 contains the second filler on the fluororesin layer 2b side of the base material 5 of the sheet material having the structure shown in FIG. The second fluororesin layer 12 is provided.

A first fluororesin 11 containing 10% by weight of glass beads and glass bubbles as in Example 11 as a first filler, and a 5% brass powder as in Example 11 as a second filler. % Of the second fluororesin layer 12.

According to the twelfth embodiment, when light is incident on the sheet material from below in FIG. 4, a predetermined reflectance can be obtained without significantly lowering the light transmittance of the sheet material as in the eleventh embodiment.

Note that the first and second fluororesin layers 11 and 12 may be configured so that one of them has reflectivity and the other is colored.

Reference Example 13 As shown in FIGS. 5A and 5B, the fluororesin sheet material of Reference Example 13 has the same structure as that of FIG. 4, but the fluororesin layer 2a of the base material 5 shown in FIG. The first fluororesin layer 11 is partially formed such that a pattern 15 consisting of the letter "Y" is formed thereon.

First fluororesin layer containing 10% by weight of red iron oxide (ferric oxide) for coloring red as a first filler
11 was formed using an appropriate pattern so as to be a character of "Y". Also, a second fluororesin layer containing 1% by weight of nickel powder as a reflective filler as a second filler.
12 formed.

According to Reference Example 13, a pattern such as a predetermined character or picture can be freely formed in a desired color on the surface of the sheet material, and the second fluororesin layer has reflectivity.
The pattern can be made more prominent.

Reference Example 14 Depending on the type of the filler contained in the fluororesin layer, the sheet material may be affected by, for example, an acid, an alkali, or an organic solvent. When the fluororesin layer filled with a metal foil or the like is exposed to the above-described corrosive environment, changes in the fluororesin layer due to corrosion of the filler or elution of the filler are likely to occur.
In order to prevent this, it is effective to apply a fluororesin layer containing no filler or a fluororesin layer containing a filler having chemical resistance and solvent properties on the fluororesin layer containing the filler.

Reference Example 14 is a sheet material having the same structure as the fluororesin sheet material shown in FIG.
A first fluororesin layer 11 containing 10% by weight was formed, and then a second fluororesin layer 12 containing no filler was formed in the same manner as in Reference Example 4.

For comparison, a similar fluororesin sheet material was prepared except that the second fluororesin layer 12 was not formed in Reference Example 14 described above.

The sheet material of Reference Example 14 and a sheet material for comparison were used.
After immersing in a 20% solution of hydrochloric acid at 40 ° C. for 48 hours, the surfaces of these sheet materials were observed. As a result, no change was observed in the sheet material of the present reference example in which the fluororesin layer 12 containing no filler was the outermost layer, but a sheet material for comparison in which the fluororesin layer 12 was not formed was used. The surface was completely discolored.

Reference Example 15 Reference Example 15 is a sheet material having the same structure as the fluororesin sheet material shown in FIG. 1, except that the thickness of the fluororesin layer 3 containing 10% by weight of mica was set to about 40 μm. Prepared the same sheet material of Reference Example 1.

The light reflectance and the light transmittance of the sheet material of Reference Example 15 were measured. The results are shown in Table 4 below.

The chart also shows the results of Reference Example 1 for comparison.

Table 4 shows that the light reflectance and light transmittance of the sheet material can be changed by changing the thickness of the fluororesin layer 3 containing the filler.

As described above, according to the embodiment, the desired light reflectance (5 to 95%) can be obtained by freely changing the type and / or the content and / or the thickness of the reflective filler in the fluororesin layer. And a fluororesin sheet material having a light transmittance (0 to 25%). And, in addition to the fluororesin layer having reflectivity, by separately providing a colored fluororesin containing a coloring pigment of a desired color,
A sheet material of a desired color can be obtained. Further, a fluororesin layer in which a reflective filler and a filler for coloring are mixed may be provided. Further, by providing a fluororesin layer containing glass bubbles and glass beads for enhancing the light transmittance, a sheet material having a predetermined light reflectance can be obtained without a significant decrease in light transmittance. Further, it is also possible to form a desired pattern on the surface of the sheet material, or to provide different colors and / or tones on both surfaces. When the sheet material is used in a corrosive environment, the outermost layer (layer exposed to the corrosive environment) is preferably a fluororesin layer containing no filler.

Therefore, the fluororesin sheet material described above can be used in an extremely wide range as compared with conventional ones.
Hereinafter, one application example will be described.

Application example The fluororesin sheet material of Reference Example 1 described above, the fluororesin sheet material of the comparative example, and the conventional fluororesin sheet material containing no filler are used as roofing materials for a building model having an internal volume of 1 m ^3. I applied each one. Then, a change in the outside air temperature and each room temperature were measured. Table 5 shows the results.

The sheet material of the comparative example has the same structure as that of FIG. 1, and the fluororesin layer 3 contains 5% by weight of graphite.
It is colored black. The thicknesses of the above three types of sheet materials are almost the same, and their light reflectance and light transmittance are shown in Table 5. The sheet materials of Reference Example 1 and Comparative Example were attached such that the fluororesin layer 3 containing the filler was on the outside (on the side where natural light was incident).

As can be seen from Table 5, the room temperature is the lowest in the example having the highest light reflectance, and the highest in the comparative example having the lowest light reflectance. In the conventional example having a lower light reflectivity than the sheet material of the example 1 and higher than the comparative example, the room temperature was an intermediate temperature between the example and the comparative example.

As can be seen from the above results, the temperature inside the building can be made lower than the outside air temperature by using the sheet material having a high light reflectance of the present embodiment. Therefore, it is possible to achieve a reduction in equipment cost and energy consumption for adjusting the air temperature in the building.

Further, for example, when the sheet material of Reference Example 1 is used such that the fluororesin layer 3 is located inside a building, it is possible to enhance a heat retaining effect or an internal lighting effect.

The fluororesin sheet material according to the present invention can obtain a desired light reflectance and light transmittance, and can select a desired color / tone and freely form a pattern. For example, when used for construction, Architectural design and design flexibility can be increased.

Further, the fluororesin sheet material according to the present invention may be used not only for architectural purposes, but also as a belt material for a belt conveyor, a release film, a release sheet, an inner wall material in a corrosive environment, a partition material, and the like. In this case, good characteristics are exhibited. Also, by laminating and heat-pressing the sheet materials, it is possible to use the laminated sheet as an integrated laminate.

As described above, Reference Examples 1 to 8, 12 to 15, and Examples 9 to
Although 11 and the application examples have been described, the present invention is not limited to the above-described embodiments and application examples, and various fluororesin layers are formed based on the technical idea of the present invention according to various uses of the sheet material. It will be understood that the fluororesin sheet material according to the present invention can be used in various fields.

〔The invention's effect〕

Since the present invention is configured as described above,
The following effects are obtained.

Since a fluororesin layer containing a reflective filler is provided and the content and type of the filler and the thickness of the fluororesin layer can be arbitrarily changed, a desired light reflectance and light transmittance can be obtained. And a fluororesin sheet material excellent in chemical stability and weather resistance can be provided.

Since a fluororesin layer containing a reflective filler and a coloring pigment, or another fluororesin layer containing a coloring pigment can be provided, fluorine having a desired light reflectance, light transmittance, and color / color tone can be provided. A resin sheet material can be provided.

Since a reflective and / or colored fluororesin layer can be provided on both surfaces of the woven fabric, respectively, the fluororesin sheet material having different light reflectance, light transmittance and / or color / color tone on both surfaces of the sheet material Can be provided.

Since the fluororesin layer can be partially provided on at least one surface of the sheet material, it is possible to provide a fluororesin sheet material which forms a desired pattern and has predetermined light reflectance and light transmittance.

Since another fluororesin layer containing a filler for enhancing light transmittance can be provided, a fluororesin sheet material having a predetermined light reflectance can be provided without a significant decrease in light transmittance.

[Brief description of the drawings]

1 to 5B show an embodiment according to the present invention. FIG. 1 is a sectional view of a fluororesin sheet material of Reference Examples 1 to 3, 8, 15 and Example 11, and FIG. Are Reference Examples 4, 5,
6, 7 and 14 are cross-sectional views of the fluororesin sheet material, FIG. 3 is a cross-sectional view of the fluororesin sheet materials of Examples 9 and 10, and FIG. 4 is a cross-sectional view of the fluororesin sheet material of Example 12. FIG. 5A is a cross-sectional view of the fluororesin sheet material of Example 13, and FIG.
FIG. 5B is a plan view of the sheet material shown in FIG. 5A. In addition, in the code | symbol used for drawing, 1 ... Glass woven fabric 3,11,12,13 ... Fluorine resin layer 15 ... Pattern.

Claims (7)

(57) [Claims] 1. A first fluororesin layer containing a light-reflective filler or a coloring pigment is provided on one surface of a woven fabric made of glass fiber and fluororesin, and on one surface or the other surface of the woven fabric. A fluororesin sheet material comprising: a second fluororesin layer containing glass beads or glass bubbles; and a third fluororesin layer provided on the one surface or the other surface of the woven fabric. 2. The sheet material according to claim 1, wherein said filler is composed of mica. 3. The sheet material according to claim 1, wherein the second fluororesin layer has a light transmitting property. 4. A sheet material according to claim 1, wherein said first, second or third fluororesin layer is partially provided to form a predetermined pattern on said one surface. 5. The content or thickness of the filler is selected so that the first, second or third fluororesin layer has a light reflectance of 5 to 95%. 4. The sheet material according to any one of 4. 6. The content or thickness of the filler is selected so that the first, second or third fluororesin layer has a light transmittance of 0 to 25%. 5. The sheet material according to any one of 5. 7. The sheet material according to claim 1, wherein at least one surface of the outermost layer is a fluororesin layer containing no filler.