JP2001341219A - Tent sheet texture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tent sheet texture having waterproofness and moisture permeability while having lightweight properties and workability or handleability. SOLUTION: The tent sheet texture is constituted by laminating a heat insulating sheet 20 comprising a resin composition containing hollow particles and/or air bubbles on a nonwoven fabric 10 made of a synthetic resin and has not only lightweight properties, strength and durability but also waterproofness and moisture permeability and also has fire retardancy. By constituting the heat insulating sheet 20 by impregnating at least a part of an impregnable base material with the resin composition containing hollow particles and/or air bubbles, the heat insulating sheet is reinforced by the impregnable base material and becomes excellent in strength as the tent sheet texture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tent sheet used for a garage seat, an under-eave sheet, a piling sheet, an industrial material cover, an agricultural house curtain, and the like.

[0002]

2. Description of the Related Art Conventionally, this kind of tent sheet is used for avoiding rain, wind, sun, etc. One of the typical ones is a multi-layered material such as polyamide or polyester. A so-called tarpaulin formed by using a mesh-like woven fabric of filaments as a base material and covering the front and back surfaces with a flexible synthetic resin such as polyvinyl chloride or ethylene-vinyl acetate copolymer, rubber, etc. by calendering or laminating. It has been known.

[0003] In general, since tarpaulin is made of a mesh woven fabric as a base material, misalignment is likely to occur in a weaving step or a coating layer forming step, and non-uniform meshing is not only a problem in appearance but also in a partial manner. This causes a variation in strength. Further, those using polyvinyl chloride for the coating layer have a problem of migration of the plasticizer, have a large specific gravity, are not suitable for weight reduction, and generate hydrogen chloride during combustion. Those using a polymer may be problematic in terms of abrasion resistance and odor.

[0004] Although the strength is lower than that of tarpaulin, it is lightweight and widely used as a low-density polyethylene, a medium-density polyethylene and a woven fabric made of a flat yarn obtained by finely cutting a synthetic resin film and applying a stretching treatment. And a polyethylene laminate sheet having a coating layer formed of an ethylene-based synthetic resin such as ultra-low-density polyethylene or linear low-density polyethylene. This polyethylene laminate sheet is inexpensive, has high safety, has good productivity, and is excellent in workability and handling during stretching.

[0005]

The above-mentioned tarpaulin and laminate sheet as the tent sheet material have high waterproofness, but do not have moisture permeability, so that dew condensation easily occurs. If the entire surface is covered with heat, the heat and moisture may be trapped and cause discomfort to workers inside.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a tent which is lightweight, has good workability and handleability, and has both waterproofness and moisture permeability. To provide a sheet material.

[0007]

In order to achieve the above object, a tent sheet material of the present invention comprises a heat insulating sheet comprising a resin composition containing hollow particles and / or air bubbles in a nonwoven fabric made of synthetic resin. It is characterized by being laminated.

Further, in the tent sheet material having the above structure, the heat insulating sheet is characterized in that at least a part of the impregnating base material is impregnated with a resin composition containing hollow particles and / or air bubbles. .

[0009] Further, in the tent sheet material having the above structure, the heat insulating sheet is characterized in that a coating layer is laminated on one or both sides thereof.

[0010] In the tent sheet having the above structure, the heat insulating sheet is provided with decoration.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an example of a tent sheet material according to the present invention. The tent sheet material 1 of the present invention basically has a configuration in which a heat insulating sheet 20 is laminated on a nonwoven fabric 10 made of synthetic resin.

As the non-woven fabric 10, a non-woven fabric composed of filament-shaped long fibers made of a synthetic resin such as a polyolefin resin, a polyester resin, or a polyamide resin is used. This is because the tent sheet is often used outdoors for a relatively long time. Since it is a synthetic resin, it is durable without being corroded. Nonwoven fabrics made of long fibers are staples with a fiber length of cm or mm order. Since the surface resistance is superior to that of a nonwoven fabric made of short fibers having a shape, the nonwoven fabric is suitably employed.

The basis weight of the nonwoven fabric 10 is 30 to 200 g / m ^2.
Is preferred. If the grammage is less than 30 g / m ² , the mechanical strength is remarkably reduced, the partial strength difference is large, and even if reinforced, it is not suitable as a tent sheet material, and conversely, the grammage is 200 g / m ^2. If it exceeds, it may be heavy, lack flexibility, and may hinder handling.

Such a nonwoven fabric is obtained by randomly depositing and bonding long fibers by a direct spinning method in which spinning, drawing, opening and bonding steps are continuously performed. A thermoplastic synthetic resin is put into an extruder to be in a molten state, and the fiber extruded from the spinning nozzle is drawn into a fiber by a roller method or an air jet method. A non-woven fabric made by melt-blowing, which is formed by drawing from a spinning nozzle into a drawn fiber, or a solution in which a spinnable thermoplastic synthetic resin is dissolved in a solvent at high temperature and high pressure, is discharged into the atmosphere through a spinning nozzle, and the solvent is vaporized. Non-woven fabrics formed by flash spinning are exemplified, but non-woven fabrics formed by flash spinning are particularly suitable because of their excellent water pressure resistance and moisture permeability. A.

In the flash spinning method, a solution obtained by dissolving a synthetic resin such as high-density polyethylene or polypropylene in a solvent having a low boiling point, such as a halogenated hydrocarbon, an aromatic hydrocarbon, or an aliphatic hydrocarbon, at a high temperature and a high pressure is used. It is released into the atmosphere at low temperature and low pressure through a spinning nozzle equipped with a pressure drop chamber in a more pressurized state, and the solvent evaporates instantaneously, giving the fiber orientation by its expansion force. An ultrafine and high-strength fiber having a single-fiber fineness of about 0.1 to 0.3 dr is formed, and the nonwoven fabric obtained by non-directional deposition and thermocompression bonding while intersecting the fibers is bonded at a high density. It has a dense structure and is excellent in water resistance and moisture permeability.

Since this nonwoven fabric is made by depositing and bonding long fibers at a high density, it is opaque and has a high degree of whitening. However, as a material constituting a tent sheet material, the following spectral characteristics with respect to light are required. Those satisfying the numerical values are preferable. -Light reflectance: 85 to 93%-Light absorption: 2 to 0%-Light transmittance: 13 to 7%

That is, the light reflectance of the nonwoven fabric is 8
By being as high as 5% or more, the sheet surface reflects sunlight and can reduce the temperature rise of the internal member covered with the tent sheet or the ground surface, and the light absorption rate is as low as 2% or less. Since the non-woven fabric itself hardly accumulates heat and has a light transmittance of about 10%, the interior covered by appropriate lighting does not become a dark area, and sufficient visibility in operation can be secured. When used as a house material for agriculture, the spectral characteristics are effective as having a function of reflecting the strong light and heat of the sun during the daytime and keeping the temperature inside the house without losing the temperature at nighttime.

The non-woven fabric can be subjected to a water discharge treatment as long as the moisture permeability is not impaired. Specifically, a silicone-based, fluorine-based, zirconium-based waterproofing agent or plaffin-based metal soap is applied to the surface of the nonwoven fabric by a spraying method, a gravure coating method, or the like, and dried. When applied at a rate of 0.1 to 3 g / m ² , good waterproofness can be imparted without impairing moisture permeability.

A heat insulating sheet 20 laminated on the nonwoven fabric 10
As the sheet, a sheet made of a resin composition containing hollow particles and / or bubbles is used, and a sheet made of the resin composition is a single type of sheet made of the resin composition,
Either a lamination type in which a sheet made of a resin composition is laminated on a substrate, or an impregnation type in which an impregnable substrate is impregnated with a resin composition. Further, the heat insulating sheet 20
May be accompanied by decoration.

The heat insulating sheet 20 made of a resin composition containing hollow particles and / or air bubbles may be a foamed sheet made of a synthetic resin such as a polyethylene resin or a polypropylene resin.

The thickness of the heat insulating sheet 20 is preferably about 0.2 to 10 mm, more preferably 0 to 10 mm, because the thicker the sheet, the better the heat insulating performance, but the rigidity increases and it becomes difficult to use as a tent sheet. It is about 0.5 to 5 mm.

FIG. 2 is a cross-sectional view showing an example of an impregnated type heat insulating sheet. The heat insulating sheet 20 shown in FIG. 2 (A) is a polymer matrix 21 in which a resin composition containing hollow particles 22 is impregnated. The material 24 impregnated with the heat insulating sheet 20 shown in FIG.
2C is impregnated into the impregnating base material 24. The heat insulating sheet 20 shown in FIG. 2C has a polymer matrix 21 in which both the hollow particles 22 and the air bubbles 23 are encapsulated. The impregnated base material 24 is impregnated.

In the impregnation type, partial impregnation (impregnation to a part in the thickness direction) of one side of the impregnable base material 24 that does not reach the other side is performed, and unimpregnated base material 24 is not impregnated near the other side. May remain, and the adhesive easily penetrates into the unimpregnated portion, so that the adhesiveness can be improved.

The single type sheet made of a resin composition containing hollow particles and / or air bubbles is obtained by removing the impregnating substrate 24 from the impregnating type shown in FIG. The material obtained by removing the material 24 and laminating the base material on one side corresponds to a lamination type.

A form in which a coating layer is laminated on the heat insulating sheet 20 can also be used. FIG. 3 shows an example in which a coating layer is laminated on the heat insulating sheet 20, and FIG. 3 (A) shows an example in which the coating layer 25 is laminated on one surface of the heat insulating sheet 20, and FIG. 2 shows an example in which a coating layer 25 is laminated on both surfaces. By laminating the coating layer 25, the surface of the heat insulating sheet 20 is smoothed, the adhesive, coloring and printing are improved, and depending on the material, the strength of the heat insulating sheet surface is improved or the heat insulating property is improved. It is possible to suppress the hygroscopicity of the sheet.

The hollow particles include organic particles made of an acrylic resin such as acryl and acrylonitrile and synthetic resins such as polystyrene resin, and inorganic particles made mainly of silica and alumina. as,
Something like a volcanic shirasu balloon can also be used. Further, hydrophilic or hydrophobic hollow particles described later can also be used.

Further, a microcapsule type foaming agent which is a kind of a foaming agent for generating air bubbles and which has been foamed in advance may be used. Things can also be treated as hollow particles. Examples of foamed microcapsule-type foaming agents include hollow particles manufactured by Matsumoto Yushi Seiyaku Co., Ltd. (product number "F-8").
0ED "or" F-80E ") has a density of 0.0
Since it is as small as 2 g / cm ³ , it is effective in suppressing thermal conductivity, and is preferably used.

The particle size of the hollow particles which are generally available and can be used is in the range of 0.3 to 300 μm, and one or more of them are selected from these.

Although the hollow particles themselves are relatively strong, they can withstand external forces such as compression.
In particular, when dispersed in a synthetic resin emulsion-based coating composition, air bubbles easily enter the coating composition by a stirring operation.

Since the bubbles are useful for improving the heat insulating property, the bubbles are intentionally generated, or the bubbles are generated by using a chemical foaming agent of a microcapsule type or a decomposition type or the like to generate the bubbles. Good. Insulation can be provided only by bubbles without hollow particles.

A heat insulating sheet is prepared and used by using either hollow particles or air bubbles, or a heat insulating sheet is prepared by using hollow particles and air bubbles dispersed in a synthetic resin coating composition. When used, the hollow particles and / or the collapse of the air bubbles tend to reduce the heat insulating property over time. Therefore, in order to improve the compression resistance of the heat insulating sheet, the following three types of hollow particles are selected. It is preferable to carry out in the following manner. (1) A blend of hollow particles having different particle sizes. (2) A blend of hydrophilic hollow particles with hydrophobic hollow particles. (3) Blend of hydrophilic hollow particles and hydrophobic hollow particles having different particle diameters.

In order to fill small hollow particles between large hollow particles in the blend of hollow particles having different particle diameters in the above (1), the diameter a of the large hollow particles and the diameter b of the small hollow particles are required. Is b ≧ a (2−3 ^1/2 ) / 3
It is ^1/2 , and when this is calculated, b ≧ 0.155a. In the case of body-centered cubic, which is the sparsest filling, b
= A (2-2 ^1/2) / 2 ^1/2, is calculated this, it is b = 0.414a. Therefore, 0.155
a ≦ b ≦ 0.414a, and the diameter b of the hollow particles to be blended with the hollow particles having the diameter a is defined.

Incidentally, in the case of the densest hexagonal close packing,
In order for the hollow particles having the diameter b to just enter the gaps of the hollow particles having the diameter a without any gap, b = 2a (11/3)
^1/2 / 3, calculating this, b = 0.277a
It is.

As described above, the available hollow particles have a particle size in the range of 0.3 to 300 μm, and a combination of large and small hollow particles satisfying the above relationship is selected from these. use.

In the above, the relationship between the number N (a) of particles per unit of the hollow particles having the diameter a and the number N (b) of the voids accommodated by the hollow particles having the diameter b is as follows:
(B) / N (a) = 8: 6. In the case of body-centered cubic, N
(B) / N (a) = 4: 2. To sort this out,
1/2 ≦ N (a) / N (b) ≦ 3/4, and the weight ratio at the time of blending the hollow particles of each diameter is determined by the number of hollow particles after determining the degree of packing density. The ratio is determined by calculation from the specific gravity and particle size of each hollow particle.

The heat-insulating sheet prepared by blending the hollow particles having different particle diameters in the above (1) under such conditions and dispersing in a polymer matrix has a small diameter in a portion having bubbles. Since the hollow particles having the larger diameter are filled between the hollow particles having the larger diameter and reinforced, the compression resistance is enhanced and the structure is less likely to be crushed.

In the blend of the hydrophilic hollow particles and the hydrophobic hollow particles of the above (2), since the hydrophobic hollow particles have higher hydrophilicity with air, they are added to the coating composition during dispersion. The entrapped air bubbles are surrounded by hydrophobic hollow particles to form secondary particles having a hydrophobic outside, and the heat insulating sheet is dispersed between the hydrophilic hollow particles and the hydrophilic resin.

Here, the hydrophilic hollow particles are made of a material
It is made of glass, silica, silica-alumina, ceramic, shirasu, hollow plastic, hollow fiber, or the like, and as the hydrophobic hollow particles, those obtained by subjecting these hydrophilic particles to a hydrophobic treatment are used. is there. The mixing ratio between the hydrophilic hollow particles and the hydrophobic hollow particles is determined by calculation from the size of the bubbles to be formed, the particle diameter of each hollow particle, and the specific gravity.

The blend of the hydrophilic hollow particles having different particle diameters and the hydrophobic hollow particles of the above (3) is a combination of the means of the above-mentioned methods (1) and (2), and has a small hydrophobic particle diameter. A heat insulating sheet having a structure having air bubbles between hollow particles in which conductive particles and hollow particles having a large particle diameter are mixed is obtained.
In this method, since hydrophobic particles having a small particle size are filled between hollow particles having a large particle size, the walls of bubbles formed between the hollow particles are strengthened, and a heat insulating sheet having a structure that is not easily crushed is obtained. Can be

As the polymer matrix, the following resins can be used. For example, nitrocellulose,
Cellulose acetate, cellulose butyl acetate, ethyl cellulose, polyamide resin, chlorinated rubber, cyclized rubber, polyamide resin, polyvinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, ethylene / vinyl acetate copolymer resin, chlorinated polypropylene, or acrylic Organic solvent solution of thermoplastic resin such as resin, urea resin, melamine resin, phenolic resin, resorcinol resin, furan resin, epoxy resin, unsaturated polyester resin, polyurethane resin, polyimide, polyamideimide, polybenzimidazole,
It is a thermosetting resin such as polybenzothiazole or a polyurethane resin, and these resins can be a resin solution dissolved in water or an organic solvent.

Alternatively, a styrene maleic resin, a polyvinyl acetate resin, an acrylic resin, or a urethane emulsion, or natural rubber, recycled rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, butyl rubber, polysulfide rubber , Silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), ethylene propylene rubber, or block copolymer rubber (SBS, SIS, SEBS)
And the like, and these resins can be used as an organic solvent solution or a latex.

In order to generate bubbles, a gas, particularly an inert gas, preferably a gas having a low thermal conductivity, is mechanically incorporated into a coating composition, impregnated into an impregnable base material, and heated and foamed. In some cases, a chemical foaming agent comprising an organic compound as described below is blended into a coating composition, impregnated, and foamed by heating.

The term “blowing agent” generally refers to a chemical foaming agent of a decomposable type or the like in many cases. Available.

Examples of the chemical foaming agent include azidicarbonamide, avizosisobutyronitrile, barium azodicarboxylate, or an azimic foaming agent such as p-toluenesulfonyl semicarbazide; benzenesulfonyl hydrazide; p-toluenesulfonyl hydrazide; Examples include sulfonyl hydrazide such as 4,4'-oxybisbenzenesulfonyl hydrazide, nitroso such as dinitrosopentamethylenetetramine, sodium bicarbonate, and ammonium bicarbonate.

From the viewpoint of the action of the foaming agent, a microcapsule type foaming agent having a low boiling point hydrocarbon such as isobutane or neopentane in the outer wall made of acrylonitrile resin or the like is similar to a mechanical gas bubble. Suitable for foaming at relatively low temperatures. When a chemical foaming agent is used, a foaming aid for lowering the foaming temperature to facilitate foaming may be used, if necessary. Examples of such microcapsule type foaming agents include foaming agents manufactured by Matsumoto Yushi Seiyaku Co., Ltd. (product numbers “F-46” and “F-5”).
0 "," F-55 "," F-80 ", or" F-8 "
5 ") can be used, and these have a foaming ratio of 20 times or more, and are preferable.

When the coating composition using these foaming agents is applied or impregnated onto an impregnable substrate and foamed by heating, the thickness is preferably 0.1 to 100 times the film thickness after drying. Preferably, when the ratio is less than 0.1 times, the effect of improving the heat insulating property by foaming is poor, and when it exceeds 100 times, although the heat insulating property is provided, the compressive strength is lowered and the material is easily crushed.

As the impregnating base material, felts, nonwoven fabrics, cloths made from fibers such as natural fibers, synthetic fibers, rock wool, glass fibers, carbon fibers and the like, or papers made from these fibers are used. Paper (especially low-density paper) or a sheet such as a ceramic sheet,
One of these single-layer sheets, two of the same
A composite sheet of the same type of sheets, in which two or more sheets are laminated, or a composite sheet of different types of sheets, in which two or more arbitrary different sheets selected from these sheets are laminated, can be used. One side may be a sheet having no or poor impregnation, for example, a low moisture permeable sheet or the like may be laminated. The low moisture permeable sheet may be a decorative sheet provided with a design property, and this decorative sheet may be a single layer or a laminate composed of two or more layers.

Originally, felt was obtained by collecting animal hair, entangled by pressurizing while heating and humidifying, and forming a sheet. Currently, synthetic fibers, rock wool, and carbon are used as raw materials in addition to natural fibers. Fibers are also used. Non-woven fabric
Fibers (natural fibers are also treated, but usually synthetic fibers) are directly spun without mechanical spinning by mechanical, thermal, or chemical means into sheets. The paper is manufactured by entanglement of plant fibers and other fibers and agglutination (as defined by JIS).

As is clear from these definitions,
Felts, nonwovens, and paper, while seemingly different from each other in typical products, are essentially indistinguishable from each other. Are different in that

As papers, thin paper, kraft paper, titanium paper, resin-impregnated paper, linter paper, paperboard, gypsum board base paper, Japanese paper, and the like can also be used. More preferred ultra-low density paper is
Density 0.1 to 0.5 g / cm ³ is common, is of the order of 0.2 g / cm ³ as an example.

When felts, non-woven fabrics and cloths are included, the density is 0.01 to 1 g / cm ³ , preferably 0.1 to 1 g / cm ³ .
02 to 0.5 g / cm ³ , more preferably 0.02 to 0.5 g / cm ³
0.25 g / cm ³ . If it is less than the lower limit, the strength will be low, and the risk of damage during handling will increase. If it exceeds the upper limit, the heat insulation will be insufficient.

As for the fabric, it is preferable to use a heat-insulating fiber such as a hollow fiber as the fiber, but it is not always necessary to use a normal fiber which is not a heat-insulating fiber such as a hollow fiber. Any coarse cloth can be used.

Ceramics are mainly used as a heat insulating material in a high temperature region where heat resistance is required. Usually, the ceramic used here is a sintered compact having low thermal conductivity such as calcium silicate. A ceramic sheet is a sheet made by processing such ceramics into a fibrous shape.
Products of various thicknesses are also commercially available. The density of the ceramic sheet is preferably 0.8 to 2.3 g / cm ³ , and the thickness thereof is preferably about 0.2 to 5.0 mm.

In the above, the fibers are cotton,
Hemp, or natural fiber such as wool alone or two or more different, or synthetic fiber such as rayon, nylon, polyester, or acrylic alone or two or more different, rock wool, glass fiber, carbon fiber,
Potassium titanate fiber, alumina fiber, silica fiber or the like can be used. In the case of paper, vegetable fiber pulp is mainly used. The material constituting the ceramic sheet is not limited to silicate, which is a ceramic in a narrow sense, and alumina, silica, or zirconia alone or two or more different materials can be used.

In order to produce a heat insulating sheet using the above materials, a resin constituting a polymer matrix,
Preferably an aqueous solution of the resin, or an organic solvent solution,
Alternatively, the emulsion is mixed with hollow particles and / or a foaming agent, and various additives that can be blended as necessary, to prepare a coating composition and form a sheet. As a method for forming a sheet, a casting method in which the composition is applied to a peelable substrate and then dried and then peeled off, a method in which the composition is applied to the substrate to form a product with the substrate adhered, a method in which the impregnable substrate is impregnated and dried, and the like are used. .

The impregnation can be performed by a method of dipping the impregnating substrate in a tank filled with the impregnating coating composition (so-called dipping) or by using a known coating means from one or both sides of the impregnating substrate. Apply. After the impregnating paint has sufficiently penetrated, the excess impregnating paint is scraped off by a suitable scraping device or a removing device, for example, a suction doctor, a doctor roll, or a wire bar having a round rod wound with a wire. Alternatively, the impregnating base material is impregnated with a predetermined amount of the impregnating paint by removing the impregnating paint. Thereafter, by drying, a heat insulating sheet is obtained.

By adjusting the viscosity of the impregnating coating composition and the time from application to drying, a portion of the thickness can be impregnated. In this case, the unimpregnated portion of the other surface can be used. In addition, the adhesive can be penetrated to improve the adhesiveness.

Depending on the material constituting the impregnating coating composition, particularly the material of the polymer matrix, the material is once dried at a relatively low temperature and then dried at a relatively high temperature, or a part or all of the drying is performed. The irradiation may be performed by ultraviolet irradiation or electron beam irradiation.

A heat insulating sheet (including a composite having a coating layer) can exhibit heat insulating properties as it is, but is used for a long time or in a part where people or objects are likely to come into contact. Has a low strength, and there is a lot of risk that the heat insulating material may be damaged, stained, or absorb moisture to deteriorate the heat insulating property. For this reason, it is preferable to coat one or both surfaces of the heat-insulating sheet with another appropriate sheet for coating. Specifically, it is preferable to use a low moisture-permeable sheet that does not allow moisture to pass through. The low moisture permeable sheet may be a decorative sheet provided with a design property.

FIGS. 4 and 5 are explanatory views showing an example in which a low moisture-permeable sheet is laminated on a heat-insulating sheet previously coated on one or both sides with a coating layer.

FIG. 4A shows an example in which one surface of the heat insulating sheet 20 is covered with the covering layer 25 and the low moisture permeable sheet 26 is laminated on the side not covered with the covering layer 25. This structure is suitable for the case where the covering layer 25 is laminated as a base material when the heat insulating sheet 20 is manufactured, and the covering layer 25 can also have low moisture permeability. Of course, depending on the application, the low moisture permeable sheet 26 may be laminated on one side of the coating layer 25 so that one surface of the heat insulating sheet 20 can be exposed without the coating layer.

FIG. 4B shows an example in which a low moisture permeable sheet 26 is laminated on both sides of a heat insulating sheet 20 one side of which is covered with a coating layer 25. This structure is suitable for the case where the coating layer 25 is laminated as a base material when the heat insulating sheet 20 is manufactured, and when the coating layer 25 is not sufficient in strength and moisture absorption. .

FIG. 5A shows an example in which a low moisture permeable sheet 26 is laminated on one side of a heat insulating sheet 20 having both sides covered with a coating layer 25. FIG. 5B shows an example in which a low moisture permeable sheet 26 is laminated on both sides of a heat insulating sheet 20 whose both sides are covered with a coating layer 25.

When a low moisture permeable sheet is laminated on both sides of the heat insulating sheet, the ends of the low moisture permeable sheet are heat-sealed or adhered to each other to form the heat insulating sheet into two low moisture permeable sheets. It is preferable that the sealing be performed in order to prevent moisture from entering from the end face. In this case, the coating layer can be substituted for one of the low moisture permeable sheets.

The low-moisture-permeable sheet suppresses or substantially eliminates moisture permeation to the adjacent heat-insulating sheet, and prevents the heat-insulating sheet from deteriorating its heat insulating properties due to, for example, absorbing moisture. Things.

The lamination of the low moisture permeable sheet and the heat insulating sheet is performed by using an adhesive or by heat sealing. However, when the low-moisture-permeable sheet is disposed on both the front and back surfaces of the heat-insulating sheet and the end faces of the low-moisture-permeable sheet are sealed, the low-moisture-permeable sheet and the heat-insulating sheet may not be bonded.

In general, even if a low moisture permeable sheet is laminated, the end face of the heat insulating sheet is exposed to the air. Therefore, when moisture absorption from the end face becomes a problem, a resin paint is applied to the end face. Alternatively, the material may be sealed by melting the material with a flame.

As a material of the low moisture permeable sheet, for example,
Plastic films are preferred, and plastics include polyethylene resin, polypropylene resin, polymethylpentene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl alcohol resin, and vinyl chloride resin.
Vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl alcohol copolymer resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyethylene naphthalate-isophthalate copolymer resin, polymethyl methacrylate resin, polymethacrylic Ethyl acid resin, polybutyl acrylate resin, nylon 6
Or a polyamide resin such as nylon 66, cellulose triacetate resin, cellophane, polystyrene resin, polycarbonate resin, polyarylate resin, or polyimide resin.

On the low moisture permeable sheet, another paint prepared using a resin binder such as polyvinylidene chloride resin having low moisture permeability is applied, or a thin film of metal or metal oxide is formed to reduce gas permeation. It is better to suppress it. In these metal thin films, a mixture of metal oxides having different oxidation numbers such as silicon monoxide and silicon dioxide,
A mixture of a silicon compound and an aluminum oxide may be used, or a mixture of an organic group mainly composed of an inorganic oxide may be used.

As a method of forming a thin film, for example, a vacuum deposition method such as an ion beam method or an electron beam method, a physical vapor deposition method such as a sputtering method, a plasma chemical vapor deposition method, or a thermochemical vapor deposition method Or a chemical vapor deposition method such as a photochemical vapor deposition method.

The thickness of the thin film is preferably 50 to 300
0 °, more preferably 100 to 1000 °. If it is less than 50 °, there is almost no effect of suppressing gas permeation, and if it exceeds 3000 °, cracks may occur in the thin film and gas permeability may be reduced, and the material cost is relatively high. Although it is slightly disadvantageous from the viewpoint of thermal conductivity, from the viewpoint of preventing the heat insulating sheet from absorbing moisture,
It is also possible to replace the low-humidity sheet by laminating a metal foil or forming a coating film of a paint using a resin similar to the synthetic resin constituting the above-mentioned synthetic resin sheet as a binder.

By the way, the tent sheet is also required to have a so-called moisture absorbing / releasing property for releasing moisture. In this regard, the low moisture permeable sheet is preferably a sheet that can escape through water vapor, and a porous sheet having fine pores is preferably used. However, in outdoor applications, when it rains or when used in a wet environment, it is difficult for water to permeate. Is desirable.

The tent sheet of the present invention may be appropriately decorated. There are various ways of applying the decoration, but in addition to coloring, printing, embossing, or wiping, printing, transfer, or embroidery may be used. It is common to arbitrarily select one of these and apply one or two or more types in combination. When a pattern is provided by printing or the like, a protective layer may be provided as necessary. The decoration can be performed on the heat insulating sheet itself including the coating layer or the low moisture permeable sheet.

The tent sheet may basically have the above-described elements, but preferably has a deodorizing function and an antibacterial function.

Examples of the deodorant include metal oxides such as copper oxide, iron oxide, magnesium oxide, zinc oxide, alumina and silica; silicates such as zeolite; metal salts such as copper phthalocyanine; And aromatic and carboxylic acids.

The antibacterial agents include silver, copper, zinc,
Carry antibacterial metal materials such as tin, lead, bismuth, cadmium, chromium, or mercury on carriers such as zeolite, activated carbon, silica, activated clay, acid clay, alumina, activated bauxite, bone charcoal, molecular sieve, or glass beads It is desirable that these antibacterial materials,
The types of carriers and the amounts used thereof are not particularly limited.

The above-mentioned deodorant or antibacterial agent may be applied by applying it to the surface or blending it into the resin composition constituting the heat insulating sheet.

[0078]

Since the present invention is configured as described above, the following effects can be obtained.

The tent sheet material according to the first aspect of the present invention is characterized in that a heat insulating sheet made of a resin composition containing hollow particles and / or air bubbles is laminated on a synthetic resin nonwoven fabric. In addition to being lightweight, strong and durable, it has waterproofness and moisture permeability, and also has flame retardancy.

The tent sheet material according to the second aspect of the present invention is the tent sheet material according to the first aspect, wherein the heat insulating sheet is a substrate impregnated with a resin composition containing hollow particles and / or air bubbles. Is characterized by being impregnated in at least a part of the tent sheet. In addition to the above-mentioned effects, the heat insulating sheet is reinforced by the impregnating base material, and the tent sheet has excellent strength.

The tent sheet according to the third aspect of the present invention is the tent sheet according to the second aspect, wherein the heat insulating sheet has a coating layer laminated on one or both sides thereof. Therefore, the surface smoothness, adhesiveness and coloring, suitability for application or printing during printing are improved, and the strength of the surface of the heat insulating sheet is improved or moisture absorption is suppressed.

The tent sheet of the invention according to the fourth aspect is characterized in that, in the tent sheet of the fourth aspect, the heat-insulating sheet is accompanied by decoration, so that the appearance of the tent is improved. Is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a tent sheet material according to the present invention.

FIG. 2 is a sectional view of a heat insulating sheet.

FIG. 3 is a cross-sectional view of a heat insulating sheet on which a coating layer is laminated.

FIG. 4 is a cross-sectional view showing an example in which a low moisture-permeable sheet is laminated on a heat-insulating sheet covered on one side with a coating layer.

FIG. 5 is a cross-sectional view showing an example in which a low moisture-permeable sheet is laminated on a heat-insulating sheet covered on both sides with a coating layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Nonwoven fabric 20 Heat insulation sheet 21 Polymer matrix 22 Hollow particle 23 Air bubble 24 Impregnating base material 25 Coating layer 26 Low moisture permeable sheet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Arimichi Ito 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 2E141 AA01 AA04 AA06 AA09 EE03 EE04 EE05 4F100 AC02 AK01A AK01B AK03 AK04 AK07 AK25 AK41 AK46 AL05B BA02 DE04B DG15A DJ01B EJ82B GB01 GB90 HB00B JD04 JD05 JJ02B JJ07 JK01 JK15 JL00 JL03

Claims (4)

[Claims] 1. A tent sheet material comprising a heat-insulating sheet made of a resin composition containing hollow particles and / or air bubbles laminated on a synthetic resin nonwoven fabric. 2. The tent sheet according to claim 1, wherein the heat insulating sheet is obtained by impregnating at least a part of an impregnating substrate with a resin composition containing hollow particles and / or air bubbles. Earth. 3. The tent sheet material according to claim 2, wherein the heat insulating sheet has a coating layer laminated on one or both sides thereof. 4. The tent sheet material according to claim 1, wherein the heat insulating sheet is accompanied by decoration.