JPH074914B2 - Cellulose-based heat insulating material and method for producing cellulose-based heat insulating material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellulosic heat insulating material and heat insulating material which are mainly used for the purpose of heat insulation, sound absorption, sound insulation of buildings and prevention of dew condensation.

[0002]

2. Description of the Related Art Heretofore, in this type, the following has been done. Since cellulosic fibers such as paper and paper products and pulp have been excellent in heat insulation and sound absorption / sound insulation properties from the past, these fibers can be used alone or with a flameproof, mildewproof or insectproof treatment. It has been performed by injecting it into a space such as a wall, an underfloor, or an above-ceiling to provide heat insulation. These are generally called blow-in method or blowing method. Further, as a method for forming a molded body from a chip-shaped material such as cellulose fibers, the conventionally known method for producing a glass wool mat or a fiber board is applied mutatis mutandis.
It is easily conceivable to apply an adhesive to paper such as waste paper and crushed paper products, and then spread and laminate them into a plate or mat.

[0003]

The problems described in the prior art have the following problems. In other words, the former construction method has the advantage that it can be applied without being bound by the shape of the space of the building, and that it does not create gaps between the pillars, studs, trunks, etc. in the space, but it is matte or board-like. Compared with the case of applying a heat insulating material,
Due to the restrictions of on-site construction, there is a drawback that the quality of the product is not uniform, dust is generated, and the workability is relatively long, and the workability is poor. In addition, water-based adhesives are often used together to improve the fixability of cellulose fibers, but since the moisture does not escape completely, the heat insulation performance is reduced, and water-based adhesives are used during winter construction. Because of this, there is a risk of freezing, which may reduce the adhesive strength. In the latter method of forming a mat, when a thermosetting resin-based adhesive is used, since the cellulose fiber layer has low thermal conductivity, it takes a long time to cure and cure the resin. In addition, when using a thermoplastic resin adhesive, it is difficult to evaporate the solvent and water, leaving a defect that it is difficult to satisfy both mechanical strength and heat insulation / sound insulation at the same time. The drawback is that a stable product cannot be obtained.

The present application has been made in view of the above problems of the prior art, and an object of the present application is to provide the following. That is, it is possible to form a plate-shaped or mat-shaped heat insulating material in advance without losing the characteristics of the cellulosic fiber, and to exert a great industrial effect.

[0005]

In order to achieve the above object, the present invention is as follows. That is,
The present invention, as a result of a detailed study, a composition with a fibrous material or a paper piece obtained by crushing a paper and a paper product coated with a pressure-sensitive adhesive or an adhesive as a mat to have a predetermined thickness by spreading, Thread spacing 3mm-10m on one or both sides
It was found that the above-mentioned problems can be solved by placing a net-shaped fabric of m on the surface and press-molding.

[0006]

Next, the manufacturing method of the present invention will be described. Add a pressure sensitive adhesive or adhesive consisting of a thermoplastic or thermosetting resin to crushed waste paper with water content adjusted to about 10%, and sprinkle and stack it on a net-like woven fabric with a thread interval of 3 mm to 10 mm to give a predetermined thickness. The mat of If necessary, place additional netting on this mat. Next, the mat is inserted into a press machine and compressed, and the adhesive is solidified by means such as heating and cooling to integrate the net-like woven fabric and the pulverized waste paper. If the press plate of the pressing device is a flat plate, the waste paper does not swell out of the net-like fabric, and by using upper and lower wire nets for the press plate, the waste paper swells out of the net and expands. The shape of the wire net is preferably 3 mm or more and 20 mm or less, and the linear shape is preferably 1 mm to 5 mm or less. The operation of adding the adhesive is carried out by a method of spraying the adhesive on the waste paper composition when using a water-soluble or emulsion type adhesive, and a method of mixing and stirring when using a solid powdery resin. . The pressing device is selected according to the characteristics of the resin to be used, such as one provided with a heating plate for heating, one provided with a steam injection mechanism, one provided with a high-frequency heating device, and the like.

[0008]

EXAMPLES Examples will be described with reference to the drawings. Waste paper whose water content is adjusted to about 10% is crushed, and this crushed waste paper preparation is discharged with a blower at a rate of 100 kg / h, and further, an aqueous acrylic system in which the solid content concentration is adjusted to 25% in this discharge product. The emulsion-type adhesive is sprayed with a spray gun at a rate of 40 kg / hour, and the two are mixed under an air stream to apply the adhesive in a dotted manner on the crushed waste paper preparation. The crushed waste paper coated with the adhesive is immediately laminated as it is onto a net-like fabric having a yarn interval of 3 mm to 10 mm. Further, the same net-like fabric as above is placed on this laminate. The amount of the adhesive compounded is preferably in the range of 5 to 15% with respect to the pulverized waste paper, and the solid content concentration of the adhesive is preferably in the range of 25 to 50%. Then insert the laminate into a hot press machine,
20% moisture by heating or aeration of heated steam
It is compressed and dried as follows. Typical properties of the product thus obtained are as follows. Water content 15% Density 0.04 Thermal conductivity 0.034 By using a net-like woven fabric having a shape-retaining property of 3 mm to 10 mm, the shape can be retained without being broken during handling during construction. In addition, use a net-like fabric with a thread interval of 10 mm or more in the same manner, or
When a net-like woven fabric having a size of mm or less was used, sufficient shape retention was not obtained, and collapse occurred at the time of handling the construction. Or, the product was not strong and the net-like fabric was peeled off.

The operation will be described. The present invention is characterized in that the crushed waste paper is sandwiched between net-like fabrics having a yarn interval of 3 mm to 10 mm and pressed. In this method, when the pulverized waste paper is pulled out from the pressing device after the compression operation, the residual residual stress in the vertical direction of the waste paper composition is released, and some waste paper compositions swell and bulge between the nets and bind the nets tightly. To do.
Therefore, although the net is firmly integrated with the waste paper, it is considered that the swelling pressure of the waste paper composition acts as a tension on the net to improve the apparent tensile elastic modulus in the horizontal direction. It is considered that the present invention has the combined effect of joining and the net-like woven fabric being bound together by the used paper composition itself, as compared with the one in which the net-like woven fabric is joined to the used paper composition. When the yarn interval is larger than this range, the waste paper composition swells, but this effect cannot be obtained because the net is not tensioned. If the thread spacing is smaller than this range,
Since the waste paper composition cannot swell, the effect of the present invention cannot be obtained.

[0010]

Since the present invention is configured as described above, it has the following effects. The cellulosic heat insulating material of the present invention has a strength obtained by molding a composition obtained by crushing paper and a paper product and a net-like woven fabric having a yarn interval of 3 mm to 10 mm into a mat shape by using an adhesive. The property and the thermal property are shared by these two elements, respectively, and the material has a well-balanced combination of these functions. As a result, the cellulosic insulation material was supplied as a mat-shaped industrial product with uniform quality, and the insulation process was rationalized and simplified. That is, it has become possible to apply a cellulosic heat insulating material, which is functionally superior to a heat insulating material such as glass wool or rock wool, by the same means as these.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat insulating mat.

FIG. 2 is a perspective view of a surface.

[Explanation of symbols]

 1 Waste paper composition bonded by an adhesive 2 Net-shaped fabric 3 Waste paper composition swollen between yarns

Claims (3)

[Claims] 1. A thread interval of 3 mm to 10 m on one side or both sides.
It has a bulk density of 0.03 to 0.20 in which a fibrous material or a paper piece obtained by crushing a paper and a paper product on which the net-like woven fabric of m is placed is bonded by an adhesive or an adhesive. A cellulosic heat insulating material. 2. A composition having a fibrous material or a paper piece obtained by crushing paper or a paper product coated with a pressure-sensitive adhesive or an adhesive as a main component is spread and laminated to form a mat having a predetermined thickness, and a yarn is provided on one or both sides of the mat. A net-like woven fabric having an interval of 3 mm to 10 mm is placed and press-molded to reinforce the bulk density of 0.
A method for producing a cellulosic heat insulating material, characterized in that it is configured to have a thickness of 03 to 0.20. 3. The method for producing a cellulosic heat insulating material according to claim 2, wherein pressure is applied while heating with a high-frequency heating device.