JPH0673940B2 - Method for manufacturing heat insulating material for metal plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a method for producing a heat insulating material for metal plate.

[Conventional technology]

Conventionally, a metal folding plate having heat insulating properties is manufactured by stacking a heat insulating material on a metal plate and then bending it.
As a heat insulating material, mats such as glass fiber, asbestos and gypsum, and polyethylene foam sheets are used.

However, the above-mentioned heat insulating material has a low strength, and has a drawback that when it is bent, it is cut at the bent portion and pressed at the bent portions on both sides at the valley portion to cause bulging or peeling.

In order to solve the above-mentioned drawbacks, a sheet-shaped material composed of glass fibers and organic fibers is needle-punched, and a heat-insulating material for metal origami plate (Japanese Patent Laid-Open No. 58-13
No. 5189) is proposed.

However, in the above-mentioned heat insulating material, there is a drawback that the glass fiber is broken during the bending process, the glass powder is scattered and the working environment is deteriorated, and when the metal folding plate is used as the roof material, the glass fiber has almost no water retention property. Since there is no condensation water, there is a drawback that condensed water falls into the room.

[Problems to be solved by the invention]

In view of the above drawbacks, the present invention is cut during bending, does not cause swelling or peeling, does not scatter glass powder, has high water retention when used as a roofing material, and condensed water falls indoors. It is an object of the present invention to provide a method for producing a heat insulating material for metal orthographs that does not have such a problem.

[Means for solving problems]

As the glass fiber used in the present invention, it is possible to use any one, but it is preferable that the glass fiber is bulky when formed into a sheet-like material, has high strength, and is easily arranged in the thickness direction, so that it is a direct melt. Fiber produced by the method, marble melt method or the like is preferable, and non-alkali glass (E glass) is preferable as the raw material glass.

The diameter of the glass fiber is preferably 5 to 16μ,
More preferably, it is 8 to 12 μm, and the length is preferably 30 to 150 mm.

The water-soluble organic fiber used in the present invention is one that adheres glass fiber as an adhesive during hot water treatment and imparts water retention property, so it dissolves in hot water at 60 to 100 ° C. and swells in water at room temperature. Is preferred, and for example, water-soluble vinylon fiber is preferably used.

As the water-insoluble organic fiber used in the present invention, any water-insoluble organic fiber can be used, such as cotton,
Natural fibers such as hemp and silk, recycled fibers such as rayon, semi-synthetic fibers such as acetate, polyethylene, polypropylene, vinylon, polyvinyl chloride, polyvinylidene chloride,
Examples thereof include synthetic fibers such as polyacrylonitrile, polyurethane and polyamide.

The water-soluble and water-insoluble fibers are made into a non-woven fabric, and are integrated by a sheet punching material mainly composed of glass fibers by needle punching, so that the diameter is preferably 1 to 10 denier, more preferably , 1.5 to 5 denier, and its length is preferably 30 to 150 mm.

The sheet-like material in the present invention is mainly composed of the above-mentioned glass fiber, but it is preferable that the organic fiber is mixed in order to have strength against a force such as compression and shear.

Examples of the above-mentioned organic fibers include the above-mentioned water-soluble organic fibers and water-insoluble organic fibers, and heat-fusible fibers.

As the heat-fusible fiber, a fiber in which a hot-melt adhesive is laminated around the organic fiber, a fiber in which the organic fiber is dispersed in a sea-island shape in the hot-melt adhesive, and a heat-bond with the organic fiber Examples of such fibers include composite fibers such as laminated fibers, and their diameter is preferably 1 to 10 denier, more preferably 1.5 to 5 denier, and length is 50 to 150 denier.
mm is preferred.

It is preferable that 60 to 95% by weight of glass fiber and 40 to 5% by weight of organic fiber are mixed, and more preferably glass fiber because the amount of organic fiber becomes flammable when it is increased and the strength is decreased when it is decreased. 70 to 90% by weight and organic fiber 30 to 10% by weight.

Any known method may be adopted as the method for producing the sheet-shaped material mainly composed of the glass fiber. For example, the glass fiber is cut into a predetermined length, defibrated once, and then collected by a fiber collecting machine. A sheet-shaped method is adopted.

The non-woven fabric used in the present invention is composed of the water-soluble organic fiber and the non-water-soluble organic fiber, laminated on the sheet-like material, and integrated by needle punching. It is preferably 8 to 40 g / m ² because the effect of healing and the effect of preventing the scattering of glass powder during molding are reduced, and when the amount of the water-soluble organic fiber added in the non-woven fabric is small, the adhesion with the glass fiber is reduced. Less, the effect of preventing the scattering of glass powder,
The mechanical strength and water retention are lowered, and conversely, the hardness is increased and wrinkles are liable to occur. Therefore, it is preferably 30 to 70% by weight in the nonwoven fabric.

In the present invention by laminating the sheet and the nonwoven fabric, although for integrated by needle punching non-woven fabric side, the needle punching is cm ² by felt needles
It is preferable that 15 to 40 points are processed per hit, and in this case, it is preferable that the tip of the felt needle penetrates the sheet-like material and protrudes 5 to 10 mm.

The non-woven fabric may be laminated on at least one surface of the sheet-like material, but may be laminated on both surfaces, or may be needle punched or processed on both surfaces.

In the present invention, the laminated body obtained by needle punching after integration is subjected to hot water treatment, but the hot water treatment dissolves and bonds the surface of the water-soluble organic fiber entangled in the glass fiber. Examples thereof include a method of spraying hot water or steam of 80 ° C. or higher, a method of immersing in hot water, and the like. It is preferable to spray water or hot water and then pressurize it with a heating roll to improve adhesiveness. . The surface temperature of the roll is preferably 100 to 200 ° C., and the roll interval is preferably 20 to 60% of the thickness of the laminate before pressing.

〔The invention's effect〕

The structure of the method for producing a heat insulating material for metal orthographic printing plate of the present invention is as described above, the obtained heat insulating material is a sheet-like material and the nonwoven fabric is integrated by needle punching, the glass fiber is a water-soluble organic fiber Since it is adhered by the glass fiber, there is little fluffing of the glass fiber, it is easy to handle, easy to handle, excellent in heat insulation, it is hard to break even if a force such as compression shear is applied, and the tensile strength and bending strength are large, It is difficult to peel between layers. Therefore, the bent part is not cut when the metal plate is laterally laminated and then bent, and the bulge and peeling do not occur in the valley part, and at that time, the glass powder does not scatter and the working environment is good. It has good water retention properties and prevents condensation water from falling inside when used as a roofing material.

〔Example〕

 Next, the present invention will be described with reference to examples.

Example Glass long fibers (E glass, diameter 9μ, fiber length 50 to 80 mm)
90 parts by weight and 10 parts by weight of polyester-based heat-fusible fiber (diameter 4 denier, fiber length 51 mm) were mixed and a sheet-like material having a thickness of 15 cm and a weight of 530 g / m ² was produced by a web manufacturing machine.

A non-woven fabric composed of 4 g / m ² of water-soluble vinylon fiber (diameter 3 denier, fiber length 51 mm) and polyester fiber (diameter 4 denier, fiber length 51 mm) 6 g / m ² was laminated on one surface of the obtained sheet-like material, and the other. Nonwoven fabric consisting of 6g / m ^{2 of} vinylon fiber and 4g / m ^{2 of} polyester fiber (diameter 4 denier, fiber length 51mm) is laminated on the surface, and the needle penetration length is 9mm and needle density is 25 points with 19th felt felt needle from each side. Need punching was performed under the condition of / cm ² to obtain an integrated 5 mm-thick laminate.

The obtained laminate is supplied to a pinch roll having a diameter of 250 mm, a surface temperature of 160 ° C. and a clearance of 3 mm while spraying water at a rate of 40 g / m ² , heated and pressurized, and then supplied to a hot air dryer at 170 ° C. And heat treatment for 10 minutes, thickness 5 mm, apparent density 0.1
A heat insulating material of 1 g / m ³ was obtained.

The delamination strength of the obtained heat insulating material was 1050 g / 30 mm width (pulling speed 300 mm / min). Also cut the above heat insulating material to 10 × 1
A block of 0 × 10 (cm) was created, soaked in water at room temperature for 24 hours, taken out, placed on a net, and the water retention capacity when the water stopped dripping was measured to be 606% (of its own weight). 606%
Of water is included. )Met. In addition, when the obtained heat insulating material was attached to a colored zinc iron plate with a thickness of 0.8 mm with a neoprene adhesive and a goby-type plate was molded with a plate making machine, the heat insulating material was cut at the bent part. A metal origami plate was obtained without swelling or peeling at the valley. The obtained plate was nonflammable when tested for nonflammability according to the Ministry of Construction Notification No. 1828 test method.

Comparative Example A non-woven fabric made of polyester fiber (diameter 4 denier, fiber length 51 mm) 10 g / m ² was laminated on both sides of the sheet-like material obtained in Example, and needle punching and heat treatment were performed in the same manner as in Example. After that, a heat insulating material was obtained. When the physical properties of the obtained heat insulating material were measured in the same manner as in the example, the delamination strength was 550 g / 30 mm width and the water retention amount was 530%.

Claims (2)

[Claims] 1. A sheet-shaped product mainly comprising glass fibers, and a non-woven fabric composed of water-soluble organic fibers and non-water-soluble organic fibers, which are laminated, integrated by needle punching from the non-woven fabric side, and then subjected to hot water treatment. A method for producing a heat insulating material for metal lithographic cutting, comprising: 2. The method for producing a heat insulating material for metal lithographic cutting according to claim 1, wherein the sheet material comprises 60 to 95% by weight of glass fiber and 40 to 5% by weight of organic fiber.