JPS6038272B2 - Method for manufacturing laminated paper with wire mesh - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing laminated paper with wire gauze.

Pipe covering paper for insulation materials, such as glass wool, which is particularly unstable in shape, requires wire mesh to stabilize the shape and make it robust, and it is also recommended to cover the surface with aluminum foil for moisture resistance and properties. Bonded laminated paper is required.

However, in reality, when thick wire mesh is glued from both sides with adhesive, only the surface of the so-called tortoise-like part of the middle wire mesh will be glued in a flat line, so it will not stick to the surface of the pipe, etc. When coated in a curved manner, the surface layer and the back layer had an incomplete adhesion, resulting in peeling.

The present invention was made in view of the above circumstances,
A hot melt adhesive such as polyethylene is applied in advance or simultaneously to the adhesive surfaces of both the surface layer and the back layer, and both hot melt adhesives are melted and pressed onto the intermediate layer through a wire mesh in a hot press process. This relates to the manufacturing method.

An embodiment of the manufacturing method of the present invention will be described below based on the drawings. The intermediate layer 1 consists of a wire mesh 2, which is made of thin wire knitted in a tortoise shape and is flexible.
The surface layer 3 has a three-layer structure in which a hot-melt adhesive 4 made of polyethylene is applied to the back side of a base paper 5 made of kraft paper, which is adhered to an aluminum foil 6. On the other hand, the back layer 7 has a double structure in which a hot melt adhesive 9 made of polyethylene is applied to the surface of a base paper 8.

In the case of this example, the surface layer 3 was bonded in advance in a triple structure, and the back layer 7 was bonded in a double structure in advance. While extruding, the kraft paper may be pressed onto the base paper at the same time.

Furthermore, adhesion of the kraft paper to the base paper and the aluminum foil may be performed by applying an adhesive onto the kraft paper using a knife or roll coating, or by simultaneously laminating the aluminum foil and the kraft paper. Next, both sides of the hot melt adhesive 4 coated with polyethylene, which is the back side of the surface layer 3, and the hot melt adhesive 9, coated with polyethylene, which is not on the front side of the back layer 7, are preheated with an infrared lamp.

Continuing from this heating process, the hot melt adhesives 5 and 6 coated with polyethylene are bonded together by heating and pressing to about 15,000 yen using two rollers, with a heating loaf on the bottom and a rubber roller on the top. When crimped, both adhesives 5,
9 are melted and pressed together, and strong adhesion is achieved with the surface layer 3 and the back layer 7 swollen at the upper and lower positions of the wire mesh 2. That is, the manufacturing method of the present invention is characterized in that it consists of a step of melting and pressing the hot melt adhesives applied in advance or simultaneously to both sides, rather than one side, through a wire mesh, so that both adhesives 5, It is not the same as the structure in which 9 is crimped onto the top to form an integral layer.

Furthermore, the hot-melt bush agent used in the production method of the present invention can be widely used in polyolefins such as polyethylene and polypropylene, and heat-melting synthetic resins such as ethylene vinyl acetate and vinyl chloride.

Furthermore, the base paper referred to in the manufacturing method of the present invention is of course not limited to the kraft paper mentioned in the examples, but has a wide concept including tar-impregnated paper, nonwoven fabric, and the like. The structure of the laminated paper obtained by the manufacturing method of the present invention can be changed depending on requirements, whether or not aluminum foil is used.

However, the manufacturing method of the present invention is limited to a method in which the front layer and the back layer are melt-pressed through an intermediate layer such as a wire gauze which has some thickness and has mesh gaps. The wire-mesh laminated paper produced as described above does not peel off even when slightly bent, is much cheaper than conventional adhesive-based products, and has extremely high production efficiency. .

In these days of energy conservation, there is a great demand for wire mesh laminated paper obtained by this manufacturing method.

[Brief explanation of drawings]

FIG. 1 is a plan view of a laminated paper with wire gauze obtained by the manufacturing method of the present invention, and FIG. 2 is a sectional view taken along line 1-1' in FIG. 1...middle layer, 2...middle layer wire mesh, 3.
...Surface layer, 4, 9...Hot melt adhesive, 5
, 8... Base paper, 6... Aluminum foil, 7.
...Back layer. Figure 1 Figure 2

Claims (1)

[Claims] 1 A surface layer consisting of aluminum foil adhered as necessary to the surface of the base paper whose back side has been coated with a hot melt adhesive in advance or at the same time, an intermediate layer consisting of a wire mesh, and a hot melt adhesive coated on the surface in advance or at the same time. A method for producing laminated paper with wire mesh, comprising the step of melting and pressing the back layer of the base paper through the wire mesh of the intermediate layer with hot melt adhesives in a hot pressing step.