JPH0430908B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cushion material for laminated molding.

(Prior art) Conventionally, when manufacturing laminates, decorative boards, etc. by lamination, nonwoven fabrics, rubber sheets, cloth-resistant sheets, adhesive sheets,
An elastic structure made by arranging and overlapping one or more sheets of glass cloth as shown in Figure 2,
It was done by inserting it between the hot platen of the molding press and the stainless steel end plate. In FIG. 2, 1 is a heat-resistant cloth, 2 is an adhesive sheet, 3 is a nonwoven fabric, 4 is a rubber sheet, and 5 is a glass cloth.

However, under harsh conditions such as intermittent use at high temperatures and high pressures, these elastic materials tend to cause parts of the rubber sheet or adhesive sheet to ``seep'' onto the surface of the elastic structure. Feathers are more likely to form on the heat-resistant cloth, and the viscous material generated at this time "sticks" to stainless steel mirror plates, reducing workability, and also causing small dents on the surface of formed laminates and decorative boards. There was a problem in that it caused a defect called "defects".

(Object of the Invention) An object of the present invention is to provide a cushion material that does not "seep" onto the surface of the viscous material of the elastic structure and does not generate feathers.

(Structure of the invention) The present invention provides a heat-resistant cloth, an adhesive sheet, a nonwoven fabric,
For laminated molding, consisting of a rubber sheet, glass cloth, rubber sheet, nonwoven fabric, adhesive sheet, and heat-resistant sloss, which are layered in this order, and metal foil is layered on both sides of the top and bottom layers via an adhesive material layer. It is a cushion material.

The present invention will be explained in detail based on the drawings showing one embodiment thereof.

The cushion material for laminated molding according to the present invention has an adhesive material layer 7 exhibiting adhesive properties on both the top and bottom layers of a conventional elastic structure 6 having elasticity, as shown in FIG. It consists of a stacked body made by placing and stacking roughened metal foils 8.

The adhesive material layer 7 serves as a component for bonding the elastic structure 6 and the metal foil 8 to each other. In many cases, this material consists of a thin base material in the form of a sheet or film and an adhesive held (coated) on this base material, but in some cases it may consist of only the adhesive. In the former case, paper, cloth, glass cloth, metal foil, etc. are used as the thin base material. In the latter case, it is usually used in a state where it is attached to the surface of the elastic structure by a coating means or the like. Adhesive materials include epoxy resin,
Mature hardening resins such as phenol resin, melamine resin, and polyester resin, and thermoplastic resins such as vinyl resin and polyethylene resin are used.

Since metal foil is used repeatedly under severe conditions of heating and pressurization, it is required that defects such as tearing, peeling, cracking, and wrinkles do not occur over a long period of time.
Specifically, these include adhesive strength at break, elongation at break, and bending strength.

The metal foil that can be used in the present invention has values of 1.0Kg/mg to 3.0Kg/cm and 30Kg/ ^mm2 to 40Kg/cm, respectively.
^mm2 , preferably in the range of 0.1% to 2.0% and 50 times to 300 times. The thickness of the metal foil is 20 μm.
A range of ~300 μm is preferred.

As mentioned above, the adhesive material layer 7 is a component that joins the elastic structure 6 and the metal foil 8 to each other, but in the cushion material according to the present invention, the elastic structure is bonded from the first use stage. It is not essential that the metal foil 6 and the metal foil 8 be already bonded to each other by the adhesive material layer 7.

In other words, they may be joined together by heating or pressurization during the first use.

Furthermore, in making this superimposed body, the third
As shown in the figure, when the adhesive material layer and the metal foil cover the entire elastic structure and are integrated so as to be airtight, it is possible to completely eliminate the generation of fuzz from the nonwoven fabric or heat-resistant cloth. “Poor dent”
decreases dramatically. Even if it is placed only on either the uppermost layer or the lowermost layer of this metal foil elastic structure, it is effective.

The elastic structure is preferably one in which a heat-resistant cloth, an adhesive sheet, a nonwoven fabric, a rubber sheet, a glass cloth, a rubber sheet, a nonwoven fabric, an adhesive sheet, and a heat-resistant sloss are layered in this order.

Heat-resistant cloth is used to prevent the surface of an elastic structure from being deformed or damaged by mechanical or thermal shock. For example, it is made of polyethylene terephthalate fiber Tetron, polyamide fiber nylon 6, nylon 66, etc. in plain weave or A twill weave cloth can be used, and its thickness is preferably in the range of 0.1 to 2 mm.

The adhesive sheet is intended for adhering heat-resistant cloth and nonwoven fabric, and for example, rubber-based adhesives such as nitrile rubber and butyl rubber, or thermosetting adhesives such as epoxy resin and phenolic resin can be used.
Its thickness is preferably in the range of 0.1 to 2 mm.

Non-woven fabrics can maintain the cushioning properties of elastic structures for long periods of time, and are used to maintain uniform thickness during use of long fibers such as polyethylene terephthalate fiber Tetron and polyamide fibers such as nylon 6 and nylon 66. A needle-punched pine-like material can be used, and its thickness is preferably in the range of 1 to 10 mm.

The rubber sheet is capable of maintaining the cushioning properties of the elastic structure for a long period of time, similar to the above-mentioned nonwoven fabric, and can be made of sheet-like rubber such as butyl rubber, nitrile rubber, silicone rubber, etc., and has a thickness of 0.1 to 2 mm. A range of is preferred.

The glass cloth is used to prevent the rubber sheet from expanding and contracting in the horizontal direction during heating and pressurization, and is also required to have adhesive properties with the rubber sheet, so it is made of phenolic resin, epoxy resin, etc. General industrial glass cloth treated with thermosetting resin can be used, and its thickness is
A range of 0.1 to 2 mm is preferred.

Embodiment 1 As shown in FIG. 1, roughened metal foils 8, 8 coated with adhesive on one side are placed on the top and bottom layers of the conventional elastic structure 6 shown in FIG. The adhesive-applied surface was arranged to face the elastic structure 6, and a cushion material was constructed.

Comparative example 1 Glass cloth 5 sandwiched between rubber sheets 4, 4,
Nonwoven fabrics 3, 3, adhesive sheets 2, 2, and heat-resistant cloths 1, 1 were arranged as shown in FIG. 2 to constitute an integrated conventional cushion material.

According to the results of using both of the above-mentioned cushion materials for forming laminates, in the case of Comparative Example 1, viscous material "oozes out" after an average of 20 uses, and the dent defect rate decreased.
In Example 1, it was 0.50%, but there was no viscous material seeping out, and workability was greatly improved, and the defective rate of dents was reduced to 0.20%. Note that the dent defective rate is the number of defective dents that occur when 1000 laminates are molded, expressed as a percentage.

Example 2 As shown in FIG. 3, a cushion material was constructed in the same manner as in Example 1, except that the adhesive coated surfaces of the metal foils 8, 8 were arranged so as to adhere to each other.

The results of using this cushion material in the molding of laminates showed that the results of the conventional cushion material were similar to those of Example 1, but in Example 2, there was no viscous "seepage" or generation of fuzz. The dent defect rate was reduced to 0.05%.

(Effects of the Invention) The cushion material according to the present invention can be handled as a whole as a single cushion material after the elastic structure and the metal foil are bonded and integrated with each other by the adhesive material layer. becomes easier,
In addition, there is no "oozing" of the rubber sheet or adhesive sheet, and the reduction in workability caused by sticky substances is greatly improved. Furthermore, this suppresses the generation of viscous solidified substances, thereby reducing the number of "defects caused by dents."

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing how cushion materials according to an embodiment of the present invention are stacked together, FIG. 2 is a cross-sectional view showing how conventional cushion materials are stacked together, and FIG. FIG. 3 is a cross-sectional view showing how cushion materials according to an example are stacked. Explanation of symbols, 6...Elastic structure, 7...Adhesive material layer, 8...Metal foil.

Claims (1)

[Claims] 1. An elastic structure in which heat-resistant cloth, adhesive sheet, non-woven fabric, rubber sheet, glass cloth, rubber sheet, non-woven fabric, adhesive sheet, and heat-resistant cloth are layered in this order, metal is applied to both the top layer and the bottom layer through an adhesive material layer. A cushion material for laminated molding made by overlapping foils.