JPS5834418B2 - Awaseitanoseizouhouhou Oyobi Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method and apparatus for manufacturing a laminated board, in particular a method for manufacturing a laminated board, in which a plurality of plate-like bodies, at least one of which is a light-transmitting plate, are bonded together through an adhesive resin layer. The present invention relates to a method for manufacturing a laminated board formed by laminating and bonding them together, and an apparatus for manufacturing the same.

Conventionally, laminated plates, which are made by bonding two or more glass plates or a glass plate and a synthetic resin plate through an adhesive resin layer, have the advantage of not scattering fragments even if they break, and are used as safety glass. It is widely used as window glass for various transportation systems and as a building material.

The following two methods are generally used to manufacture such laminated plates.

In one method, a plasticized polyvinyl butyral film (hereinafter referred to as butyral film) is used as the intermediate layer, and the assembly is sandwiched between two pieces of glass, heated at atmospheric pressure, and then pressed between rubber rolls. , after temporary adhesion and sealing of the periphery, heat and pressure bonding is performed using an autoclave.The other method is to temporarily bond the assembly by heating and reducing the pressure in an autoclave, seal the periphery, and then perform the above-mentioned method. Similar to the above method, this is a method of heating and pressing using an autoclave.

However, in the first method, the air in the interlayer film and between the glass and the interlayer film is removed by the pressure of a rubber roll at atmospheric pressure. If the parallelism is poor, air bubbles will remain when heated and pressed in an autoclave.

Also, even if there are no bubbles left at this time, bubbles will be generated if exposed to a high temperature atmosphere afterwards.

This is particularly noticeable when a porous sintered synthetic resin sheet is used as the interlayer film.

In the second method, the assembly is placed in an autoclave and the surrounding area is sealed by reducing pressure and heating, but in this case as well, as in the first method, the thickness of the interlayer film is uneven and the opposing glass If the parallelism is poor, sufficient degassing will not occur and a large amount of air will remain, resulting in bubbles remaining even after heat and pressure bonding in an autoclave.

Even if there are no bubbles left at this time, bubbles will be generated when exposed to a high temperature atmosphere.

In order to prevent such drawbacks that occur in the first and second methods, the current efforts are to improve the capacity of the roll crimping device, improve the thickness distribution of the butyral sheet, and further improve the parallelism of the glass. This requires complex and large-scale equipment.

Moreover, this makes the manufacturing process extremely complicated, which in turn causes an increase in manufacturing costs.

The present invention provides a method for manufacturing a laminated board with the above-mentioned defects removed, and an apparatus for manufacturing a laminated board suitable for carrying out the manufacturing method. In a method for manufacturing a laminated board in which an assembly with an interlayer adhesive resin interposed therebetween is heated, cooled, and bonded together, the assembly is heated, and the heated assembly is placed in an airtight box. The assembly is degassed by bringing the inside of the airtight box to a pressure of -300 mmHf or less below atmospheric pressure, and then the airtight box is heated perpendicular to the outer surface of the assembly at a pressure below atmospheric pressure inside the airtight box. A second aspect of the present invention is a method for manufacturing a laminated board, characterized in that a pressing force is applied to the
The invention relates to an airtight box having an opening/closing means, a means for adjusting the pressure inside the airtight box to a pressure below atmospheric pressure, a heating means for an assembly in which an adhesive resin layer is interposed between a plurality of plate-shaped bodies, and a pressure roll disposed within the airtight bottle and for pressurizing the assembly heated by the heating means; and a pressure roll for sequentially pressurizing the assembly from one end to the other end of the assembly by the pressure roll. This is an apparatus for carrying out the first invention, comprising means for moving the roll relatively.

Embodiments of the present invention will be described in detail below with reference to the drawings.

An assembly in which a butyral film 2 is sandwiched between two glass plates 1 and 1' is moved to a heating zone 4 by a roller conveyor 3, and heated by an infrared heater.

When the temperature of the butyral membrane rises to 70-90°C, the upper lid 6 of the airtight box is further raised by the air cylinder 7 of the opening/closing means and moved to the dotted line, and the heated assembly is moved to the heating zone 8 inside the airtight box. is moved to the position by the roller conveyor 3.

Furthermore, the upper lid 6 is lowered by the air cylinder 7 and moved to the position shown by the solid line, so that the upper lid 6 and the lower bottom 5 are aligned.

At this point, the inside of the hermetic bottle is completely isolated from the outside air by the gasket 9.

The vacuum pump 10, which is the pressure adjustment means inside the airtight box, is operated to reduce the pressure inside the airtight box, and at the same time, heating is started, and when the temperature of the butyral film rises to 120 to 150°C, the assembly is transferred to the roller conveyor 3. The assembly is moved relative to the pressure roll 11 rotating by the pressure roll 11, and one end of the assembly is successively crimped to the other end by the pair of pressure rolls 11.

In this case, the roll pressure applied to the outer surface of the glass is 1 to 5 kg/
cIIL2 is suitable.

Through this process, the air remaining inside the butyral membrane and between the butyral membrane and the glass is completely degassed by the synergistic effect of reduced pressure and roll compression.

Next, the vacuum chamber is returned to atmospheric pressure, the air cylinder 7 is activated, the upper lid 6 is raised, and the assembly is moved to the final heating zone 1.
Move to 2.

In this state, the laminated glass is already almost completely transparent, but it is further heated to 120 to 150°C to remove distortions and minute vacuum bubbles in the glass plates bonded by the pressure roll, making it even more transparent. can be made complete.

ANSLZ-26, 1, 12 laminated glass manufactured by the method of the present invention using the apparatus of the present invention is defined.

The results of the B□i1 test are shown in the following table, and there were no defective products.

Although laminated glass was described in the above examples,
The plate-shaped body used in the present invention is not limited to a glass plate, but may be a synthetic resin plate, a metal plate, or another plate-shaped body, and the adhesive resin intermediate layer is limited to a butyral film. Any resin may be used as long as it can bond the plate-shaped body to be used without heat.

Further, in this embodiment, one pair of pressure rolls is shown in the airtight box, but it is also possible to use two or more pairs, and in the embodiment, the assembly and the pressure roll 11 are combined. Although the roller conveyor 3 is used as a means for relatively moving the parts, this can also be accomplished by keeping the assembly stationary within an airtight container and moving the pressure roll 11.

Furthermore, after the treatment in the final heating zone 12, the pressure roll 1 is further applied.
It is also possible to press with a pressure roll similar to 1.

As described above, the present invention is characterized in that a heated assembly in which an adhesive resin intermediate layer is interposed between a plurality of plate-shaped bodies is subjected to a pressing force perpendicular to the outer surface of the assembly under pressure equal to or lower than atmospheric pressure. Since the air bubbles between the laminated plates are completely degassed due to the differential pressure and pressing force, the pressing force also causes unevenness in the thickness of the adhesive resin intermediate layer and the difference between the opposing plates. Since the parallelism can be corrected, there is no need for complicated operations such as auto-tale treatment after temporary bonding of multiple glass plates, which is required in the conventional manufacturing method of laminated glass plates. This means that it is possible to obtain a laminated board that is completely free of air bubbles.

Further, when applying pressure to the assembly, the defoaming effect can be improved by sequentially applying pressure from one end of the assembly to the other end using a pressure roll.

[Brief explanation of drawings]

FIG. 1 shows one embodiment of the present invention, and is a partially cutaway sectional view of the entire device. 1.1'...Glass, 2...Butyral film, 3...
・Roller conveyor, 4... heating zone, 5.6...
Airtight box, 7...Air cylinder, 8...Heating zone in the airtight box, 9...Gasket, 10...
- Vacuum pump, 11... Pressure roll, 12... Final heating zone.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a laminated board in which a plurality of plate-shaped bodies are bonded together by interposing an adhesive resin intermediate layer between them, heating the assembly, and then cooling the assembly. The heated assembly is heated, guided into an airtight box, and the assembly is degassed by reducing the pressure inside the airtight box to less than -300111LH9 from atmospheric pressure, and then the pressure in the airtight box is reduced to below atmospheric pressure. 1. A method for manufacturing a laminated board, characterized in that a pressing force is applied perpendicularly to the outer surface of the assembly under a pressure of . 2. An airtight box having an opening/closing means, a means for adjusting the pressure inside the airtight box to a pressure equal to or lower than the large side pressure, and a heating means for an assembly in which a resin layer for adhesion is interposed between a plurality of plate-shaped bodies; a roll for pressurizing the assembly, which is disposed within an airtight bottling unit and heated by the heating means;
Carrying out the method of claim 1, comprising means for relatively moving the assembly and the pressure roll in order to sequentially pressurize the assembly from one end to the other with the pressure cr-#. equipment for.