JPS5889363A - Method of molding laminated sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a laminated sheet. Conventionally, decorative materials, laminated materials, etc. for each type of axe were mainly molded by a flat plate press, but the production efficiency was poor and the fixed size It had some drawbacks, such as being able to only mold objects. Molding by roll pressure was also considered as a continuous molding method, but it had the disadvantage that it was not possible to obtain a uniform and smooth surface finish because roll pressure was repeatedly applied and removed. decorative materials,
It could not be used for molding laminated materials, etc.

The present invention relates to a method of forming a laminated sheet that solves the conventional problem, and involves inserting two or more sheets of laminating material between two running belts pressurized with air pressure, heat-treating them, and laminating them. The object of the present invention is to provide a method for molding a laminated sheet characterized by the following.

FIG. 1 is a perspective view of an embodiment in which the molding method of the present invention is adopted, in which welfare drive rolls (2) (2) are rotatably attached to a frame a4 via bearings (g),
The frame (LIK) is equipped with a tension roll (1) (1) attached via a bearing (G) and a hydraulic cylinder M.The tension roll (1) (1) is attached to a drive roll (2 ) is transmitted, and the tension state of the stainless steel belt (3) can be adjusted appropriately using the hydraulic cylinder a.■ There is a stainless steel belt between the drive roll (2) and tension roll (1). The belt (3) runs in parallel, and the intermediate position is provided with a sleeve (9) through which the stainless steel belt (3) can enter and exit, as well as a compressed air inlet (6) and an automatic solenoid valve (6). There is a pressurized chamber (4). An electric heating plate (5) for heating the back surface of the stainless steel belt (3) is attached inside the pressurizing chamber. A sealing material 01 made of felt material is attached to the inside of the slit (9) to prevent air pressure from disappearing, and the head end of the sealing material is attached to a fixed bar α.
It is attached to p. The sealing material QO is hung in a substantially U-shape, and the tip of the U-shape is partially in contact with the back surface of the stainless steel sheet (3). The compressed air supplied from the inlet (6) is filled into the pressurized chamber, and an automatic solenoid valve (@Yoshi) that opens and closes at 91v1 and works in conjunction with the compressor (8) has a mechanism that allows the air pressure to be maintained at around 9. Further, sudden pressure increase can be avoided by the safety valve (7) operated by 11-.

Next, we will talk about a molding example of a laminated sheet.A melamine resin with a low degree of condensation is impregnated into α-cellulose printing paper with a weight of 70 t and a weight ratio of 80 t to the base material.
/y/ kraft paper is impregnated with an epoxy acrylate resin containing 251% benzoyl peroxide as a hardening agent and is inserted between the stainless steel belts (3) running at 4 minutes per minute. Then, an air pressure of 9 to 10 Ivl/ and heating of 160° C. are applied in a pressurizing chamber (4) to mold a melamine resin cosmetic sheet Ql.

Maintaining air pressure in a pressurized chamber depends on the characteristics of the sealing mechanism, so various studies have been conducted, but as a sealing material, it has a low slip mass coefficient with the belt, has good anti-slip properties, and has a small air pressure loss rate. It is desirable that the material be made of a material that does not rupture due to vibration and that can change its shape. Specific examples include the felt material in the above embodiments (this may be a material made of cotton woven fabric, synthetic woven fabric, etc., or a material impregnated or coated with wax, oil, etc. to improve sliding properties) Soft rubber-based materials, synthetic resin-based materials such as natural rubber, NBR, urethane resin (rubber), epoxy resin, Polyethylene, polypropylene, silicone rubber (m fat)
Composite materials impregnated or laminated with tetrafluoroethylene resin are suitable. In addition, even if the sealing material is solid, it may be made of a material with extremely good slipperiness such as carbon block or oil-impregnated carbon block, and it should be attached to the slit (9) as shown in Figure 4 along with the spring blade that presses against the belt. Further, in order to reduce the coefficient of friction between the back surface of the belt and the sealing material and improve the sealing performance, a means may be adopted in which oil is injected into the compressed air using an automatic oil feeder.

As a heating means, in addition to an electric heating plate as in the above embodiment, a heating medium (steam, oil, etc.) circulation, far infrared lamp, induction heating (microwave, high frequency @te), etc. can be used to obtain a molding temperature of 100 to 180°C. Heating method can be adopted. Furthermore, means such as an electric heater or circulation of a heating medium (steam, oil, etc.) within the tension roll (1) and the drive roll (2) may be employed to preheat the belt (3).

The belt wound between the drive roll (2) and the tension roll (1) can withstand a molding pressure of 8 to 15 degrees Celsius, a molding heat of 100 to 180 degrees Celsius, and a hydraulic tension of 1 to 1 oky/(,1), and has good thermal conductivity. It is necessary that the material is made of a material with good elasticity and that there are no scratches, pinholes, etc. on the belt surface, and stainless steel belts, steel belts, etc., as in the above embodiments, are suitable.Belt tension lines between the belts This is necessary for holding the molded material inserted and clamped (to prevent slipping), ensuring the finish of the laminated sheet, or rotating the tension roll (1), and does not need to be excessively large.

Further, the tension roll (1) itself may be directly driven as long as the rotation speed is the same. The running speed of the belt can be adjusted in the range of 1 to 20 minutes depending on the rotation speed of the drive rolls, etc.

The air pressure applying mechanism is maintained by a high-pressure compressor (8) having the necessary capacity to fill and replenish the air pressure of 8 to 15 watts necessary for molding and the air pressure lost from the gap between the sealing material and the belt. It is preferable that the loss of air pressure in the sealing mechanism is 5% or less, and if it reaches 5% or more, the molding pressure cannot be maintained at 8 to 15 kVaI and the molding cost is undesirably increased.

The molding conditions are greatly influenced by the molding material, especially the resin material.For example, if it is a thermoplastic resin material or a thermoplastic resin treated material, it can be laminated simply by heating and pressurizing. can be implemented. On the other hand, when molding a laminated sheet that is laminated simultaneously with the curing of the resin material, for example, when molding a melamine resin sheet, diallyl phthalate resin sheet, unsaturated polyester resin sheet, urethane resin sheet, etc., the curing time and curing temperature of the resin material are It can be determined by taking into consideration the relationship between the two, molding flow characteristics, etc. To increase the molding speed, high-speed molding processing can be adopted by using a resin material with a short curing time or by using high-temperature molding.

In addition, the molding method uses thermoplastic resin material, thermoplastic resin treated material (for example, impregnated paper, TE), thermosetting resin material or thermosetting resin treated material (for example, impregnated paper, etc.) only on the surface.
Or used only on the back side, processed paper, unprocessed paper, non-woven fabric, cloth, etc.
It can be used for plywood, particle board, asbestos slate, sheets laminated with metal sheets (e.g. copper foil, aluminum foil), sheets laminated with resin materials, resin-treated rings, etc., and the number of laminated layers is 2 or more. It can also be applied to multi-layer sheets. Furthermore, if the adhesion ηi between the laminated layers is incomplete, an adhesion aid (primer) or adhesive may be present at the laminated interface.0 Also, an uneven embossed sheet that can withstand pressure and heat between the two belts. If the belt is inserted in contact with the surface of a laminated material such as resin-impregnated paper, or if a belt with uneven embossing on the surface is used, various embossing such as wood grain can be applied to the surface of the laminated sheet. The forming method of the laminated sheet is different from the conventional forming method using a flat plate press.It can be formed continuously, so it is possible to form long objects.It is also pressurized with air pressure without using a roll press, so it is easier to form objects. It can be molded onto a smooth surface without creating any steps or irregularities on the mold material, making it ideal for applications where surface finish is an important product characteristic, such as decorative materials and laminated materials. Furthermore, since there is no moving friction when the belt runs, there is no energy loss and the molding work can be carried out smoothly.

In addition, it can be used to mold multi-purpose laminated sheets, laminated materials, etc., as it can be used freely even if the number of laminated materials and materials are changed.

[Brief explanation of the drawing]

Figure 1 shows 11! of the molding apparatus used in the molding method of the present invention.
A perspective view of the example, Fig. 2 is a perspective view of the pressurizing chamber, Fig. 3 is a structural sectional view showing the installation of the sealing material in the slit part of the pressurizing chamber,
FIG. 4 is a sectional view of the structure showing another installation of the sealing material. 1・e・tensi 1 roll 2・fist・driving roll 3...
Stainless steel belt 4... - Pressurized chamber 5 - Electric heating plate 10.12... Sealing material 13.14 -... Frame 20... Spring patent applicant Aika Gogyo Co., Ltd.

Claims (1)

[Claims] A method for forming a laminated sheet, which comprises inserting two or more laminated materials between two running belts pressurized by air pressure, heat-treating them, and laminating them.