JPS6051435B2 - Laminated sheet molding equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a laminated sheet molding device.

Conventionally, various types of decorative materials, laminated materials, etc. have been molded using flat plate press equipment, which has made it possible to mold only fixed-sized products.

Molding using a roll press machine was also considered as a molding device for continuous molding, but since roll pressure is repeatedly applied and released, continuous and constant pressure cannot be obtained, and the pressure is uniform.
Another disadvantage was that a molded product with a smooth surface finish could not be obtained. The present invention relates to a laminated sheet molding device that solves such conventional problems, and involves inserting two or more sheets of laminating material between two running endless belts, and applying continuous constant pressure from around the belt using air pressure. The present invention also provides a laminated sheet molding apparatus characterized by a mechanism that performs heat treatment and molding. The present invention will be described in detail with reference to the drawings of the embodiment. Fig. 1 is a perspective view of one embodiment of the molding apparatus according to the present invention, and the fixed frame 13 has a width 14Q07-rl, / rrL, and a diameter. 1ooorrL
, /7TL, are attached via a bearing 15' to which a rotating shaft 15 is fitted and a hydraulic cylinder 16, and the tension roll 1 is attached to the other fixed frame 14.
width 1400rrL/rrL) diameter 1000wL/n
-L (7) The drive roll 2 is attached via a bearing 15' into which the rotating shaft 15 is fitted. The tension roll 1 and the drive roll 2 are rotationally interlocked by an endless stainless steel belt 3 having a width of 1350Tn/TrL) and a thickness of 27TL/7TL and stretched at a tension of 3 to 9/d. An endless stainless steel belt 3 runs parallel to and in the same direction between the drive roll 2 and the tension roll 1, and at an intermediate position there is a length of 13807Tt, /Trt, and an opening width of 77TL, in which the endless stainless steel belt 3 can go in and out.
/Trt, an air pressurization chamber 4 with a length of 15rrL provided with a slit 9, a compressed air inlet 6, and an automatic solenoid valve 6.
exists.

Inside the pressurizing chamber 4, an endless stainless steel belt 3 and an electric heating plate 5 for heating the back surface are attached. A sealing material 10 made of felt material is attached inside the slit 9 to prevent air pressure from disappearing, and the end of the sealing material 10 is fixed to a fixing bar 11. The sealing material 10 is hung in a substantially U-shape, and the tip of the U-shape is partially in contact with the back surface of the endless stainless steel belt 3. The compressed air supplied from the inlet 6 is filled into the pressurized chamber, and the air is filled with 9/d.
The air pressure can be maintained at around 9/d by an automatic solenoid valve 6 which opens and closes in conjunction with a high pressure compressor 8. Further, sudden pressure increase can be avoided by the safety valve 7 which operates at 11/9/cTIL. 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 coefficient with the belt, has good anti-slip properties, and has a low air pressure loss rate. It is desirable to use a material that does not break and can change 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); Fabrics, mats, non-woven fabrics, etc. made from natural fibers, synthetic fibers, carbon fibers, glass fibers, etc., soft rubber materials, synthetic resin materials such as natural rubber, HBR1 urethane resin (rubber), epoxy resin polyethylene, polypropylene, etc. Composite materials impregnated or laminated with silicone rubber (resin) or tetrafluoroethylene resin are suitable. Furthermore, even if the sealing material is solid, if it is made of a material with extremely good sliding properties such as carbon block or oil-impregnated carbon block, it may be attached to the slit 9 portion as shown in FIG. 4 together with the spring 20 that presses against the belt. . Furthermore, 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 method 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 embodiments, heating medium (steam, oil, etc.) circulation, far-infrared lamp, induction heating (microwave, high frequency, etc.) that can obtain a molding temperature of 100 to 180'C can be used. method can be adopted.

Further, in order to heat the endless stainless steel belt 3 in advance, means such as an electric heater or circulation of a heating medium (steam, oil, etc.) may be employed inside the tension roll 1 and the drive roll 2. The endless belt wound between the drive roll 2 and the tension roll 1 is 8
The material must be able to withstand a molding pressure of ~15 kg/CIL, a molding heat of 100 to 180°C, and a hydraulic tension of 1 to 10 kg/Clt, and has good thermal conductivity, and also prevents scratches on the surface of the endless belt. It is necessary that there be no piwa holes or the like, and a stainless steel belt, a steel belt, etc., as in the above embodiments, are suitable.

The endless belt tension is necessary for holding the molded material inserted and held between the belts (to prevent slipping), ensuring the finish of the laminated sheet, or for one rotation of the tension roll, and does not need to be excessive. 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 m/min by changing the rotation speed of the drive rolls, etc. Endless belts are created by welding or gluing sealing materials such as stainless steel or steel, but if there is a difference in gloss or smoothness from the surface of the sealing material at the seam, the difference in gloss or smoothness is transferred to the surface of the laminated sheet. Undesirable.

Therefore, it is necessary to finish the sheet material with the same glossiness and smoothness as the surface of the sheet material. The air pressure applying mechanism is 8 to 1 necessary for molding.
It is maintained by a high-pressure compressor 8 equipped with an air pressure of 5 kg/cl and the necessary capacity to fill and replenish the air pressure lost from the gap between the sealing material and the endless belt.

It is desirable that the loss of air pressure in the sealing mechanism is 5% or less, and if it reaches 5% or more, the molding pressure will be 8 to 15k.
In addition to being difficult to maintain at 9/d, it requires an excessively large high-pressure compressor, which is undesirable because it increases the molding cost. 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, and high-speed molding can be performed in a short time.

On the other hand, when laminating at the same time as the resin material hardens - When molding laminated sheets, such as melamine resin sheets, diacryl phthalate resin sheets, unsaturated polyester resin sheets, urethane resin sheets, etc., the curing time and curing of the resin materials Make your decision by taking into account the relationship with temperature, molding flow characteristics, etc. can. To increase the molding speed, high-speed molding processing can be adopted by extending the heating device, using a resin material with a short curing time, or by using high-temperature molding. In addition, the molding equipment uses thermoplastic resin material, thermoplastic resin treated material, thermoplastic resin material or thermoplastic resin treated material only on the front side or only on the back side. It can be used for sheets laminated with asbestos slate or metal sheets (e.g. copper foil, aluminum foil), or sheets laminated with resin materials or resin-treated materials, and can also be applied to multi-layer sheets with two or more layers. . Furthermore, if the adhesion between the laminated layers is incomplete, an adhesion aid (primer) or an adhesive may be used at the laminated interface. In addition, if an uneven embossed sheet is inserted between the endless belt and the resin-impregnated paper that will not be deformed or damaged by heat and pressure conditions, or if the surface of the endless belt is etched with uneven embossments, the surface of the laminated sheet will have wood grain. Embossed shapes such as patterns can be added. Next, to describe an example of molding a laminated sheet, melamine resin with a low degree of condensation is applied to mecellulose printing paper with a weight of 70 y/d at a weight ratio of 80% to the base material.
The impregnated paper 17 and the back impregnated paper 18, which is a kraft paper having a basis weight of 150q/Rrl and which has been impregnated with an epoxy acrylate resin containing 2% benzoyl peroxide as a hardening agent, are heated at 3rrI/min. The melamine resin decorative sheet 19 was inserted between endless stainless steel belts 3 running at a speed of 1/min, and heated at 160° C. with an air pressure of 9 to 10 k9/Cltl in an air pressurization chamber 4 for 4 minutes to form a long melamine resin decorative sheet 19.

The laminated sheet molding apparatus of the present invention is different from the conventional molding using a flat plate press, and is capable of continuous molding, so it is possible to mold long objects, and since it pressurizes with air pressure instead of using a roll press, it is possible to mold long objects. It is ideal for applications where the surface finish is an important product characteristic, such as adding steps or uneven shapes to molded materials, decorative materials that are molded onto smooth surfaces, and laminated materials.

Furthermore, since no movement friction occurs 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 freely adapted to changes in the number of laminated materials and materials.

[Brief explanation of drawings]

Fig. 1 is a perspective view of one embodiment of the molding apparatus of the present invention, Fig. 2 is a perspective view of the pressurizing chamber, Fig. 3 is a sectional view of the mounting structure of the sealing material in the slit portion of the pressurizing chamber, and Fig. 4 is FIG. 7 is a cross-sectional view of another attachment structure for the sealing material. 1... Tension roll, 2... Drive roll, 3... Endless stainless steel belt,
4... Air pressurization chamber, 5... Electric heating plate, 6
...Compressed air inlet, 8...High pressure compressor, 9...Slit, 10, 12...
... Seal material, 13, 14 ... Frame, 20
...Spring, 21...Hydraulic pump.

Claims (1)

[Claims] 1. Two endless belts each wound between two rolls and running in parallel in the same direction, a heating device provided above the endless belt, and an air pressurization chamber surrounding the endless belt and the heating device. A laminated sheet molding device comprising: