JPS6156101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention forms an assembly in which an adhesive layer made of thermoplastic resin is interposed between a plurality of opposing transparent plates, particularly glass plates or plastic plates, and the assembly is heated and heated. The present invention relates to a method of manufacturing a laminate by pressing.

Conventionally, such laminates have been developed, for example, in Japanese Patent Application Laid-Open No.
As seen in Publication No. 129413, a laminated glass assembly is made by sandwiching a thermoplastic resin adhesive layer between multiple transparent plates, and the laminated glass assembly is moved to a preheating chamber, and the assembly is sealed by its own weight. After preheating the assembly to a temperature that does not exceed the temperature range, the assembly is transferred to a vacuum/heating tank, the vacuum/heating tank is depressurized to evacuate the interior of the laminated glass assembly, and the assembly is heat-sealed with an adhesive layer. A method is known in which the laminated glass assembly is heated to a temperature higher than the temperature, then the atmosphere is introduced into the tank, and the pressure is set to the atmospheric pressure or higher to bond the laminated glass assembly. Furthermore, in Japanese Patent Application Laid-Open No. 50-27812, a laminated glass assembly is made by sandwiching an adhesive layer of thermoplastic resin such as polyvinyl butyral between two glass plates, and the adhesive surface is placed around the assembly. attaching a heat-resistant rubber ring having a vent opening in the heat-resistant rubber ring, then depressurizing the adhesive layer portion of the laminated glass assembly through the vent hole in the heat-resistant rubber ring to degas the adhesive layer portion; A method is described in which laminated glass is produced by heating to 90° to 110°C for temporary adhesion, followed by autoclave treatment.

These conventional methods create an assembly and then depressurize the adhesive layer of the assembly, so even if the adhesive layer is embossed,
There was a drawback that the embossing was easily crushed and the gap between the glass plate and the adhesive layer was eliminated, making it impossible to perform air defoaming sufficiently. In particular, when a sticky thermoplastic resin adhesive that is plastic at room temperature is used for the adhesive layer, defoaming becomes more difficult, and this tendency becomes more severe as the adhesive layer becomes thinner. It was hot.

The present invention has been made to eliminate the above-mentioned drawbacks, and the present invention forms an assembly in which an adhesive layer made of thermoplastic resin is interposed between a plurality of transparent plates, and heats and heats the assembly. In a method of manufacturing a laminate by pressing, one transparent plate having the adhesive layer attached thereto or the other transparent plate is placed against an inclined conveyor, and the lower end of the other transparent plate is placed against the inclined conveyor. By aligning the lower ends of the hanging transparent plates and locking the upper ends to support pins that can be operated from outside the container to be depressurized, the transparent plates are stacked one on top of the other with a space between them and the adhesive layer facing inside. Place it on an inclined conveyor, put the inclined conveyor into the container, reduce the pressure inside the container, and then release the support pins to form an assembly in which the adhesive layer is interposed between the transparent plates. This method of manufacturing a laminate is characterized in that the assembly is then heated to a heat sealing temperature or higher, and then pressure bonded.

In the present invention, in order to attach an adhesive layer to one of the transparent plates, if a thermoplastic resin adhesive that is not sticky at room temperature is used for the adhesive layer, the adhesive layer may be partially attached by heating the adhesive layer. If the adhesive layer is sticky at room temperature, the adhesive layer is coated uniformly on the release paper using a membrane adhesive to remove air between the transparent plate and the adhesive layer. The transparent plate can be adhered while being deaerated, and when a thermoplastic resin powder adhesive is used for the adhesive layer, it is possible to electrostatically and uniformly adhere the powder adhesive to the transparent plate.

The present invention consists of one transparent plate having an adhesive layer that is not sticky at room temperature that has been partially bonded temporarily, or one transparent plate that has been degassed and has an adhesive layer that is sticky at room temperature and the other Since the assembly is formed by stacking the transparent plate and the adhesive layer in a reduced pressure container so that the adhesive layer becomes the inner surface, the air between the transparent plate and the adhesive layer can be completely degassed. Since the assembly is then heated and pressed to produce a laminate, a laminate without bubble defects can be produced. In addition, in the present invention, in order to form an assembly by overlapping one transparent plate to which an adhesive layer is attached and the other transparent plate in a reduced pressure container so that the adhesive layer is on the inner surface, the adhesive layer is One transparent plate attached,
Or, the other transparent plate is placed leaning against the inclined conveyor, and the lower end of the other transparent plate is aligned with the lower end of the transparent plate leaning against the inclined conveyor, and the upper end thereof can be operated from outside the evacuated container. By locking the supporting pins, the transparent plates are placed on the inclined conveyor with a space between them, and after the inclined conveyor is placed in the evacuated container, the supporting pins are locked. You can accomplish this by removing it. Further, the present invention provides that after forming an assembly in a reduced pressure container as described above, the container or the inclined conveyor is rotated so that the conveyor is horizontal, and the assembly is heated in the container to a temperature higher than the heat sealing temperature. and then sending the assembly between a pair of clamping rolls by the horizontally inclined conveyor,
Can be crimped.

Furthermore, in the present invention, by setting the pressure of the reduced pressure container to 360 Torr or less, preferably 160 Torr or less, the air between the transparent plate and the adhesive layer can be removed very easily, resulting in a thin adhesive layer at room temperature. Even when a thick adhesive layer is used, it can be easily degassed. Furthermore, in the present invention, a glass plate or a plastic plate is preferably used as the transparent plate, and the plastic plate may be made of polycarbonate resin, acrylic resin, polyvinyl chloride resin, polyester resin, or cellulose with a thickness of 0.5 mm or more, preferably 1 mm or more. A transparent adhesive can be used as the adhesive, such as polyvinyl butyral resin, saturated polyester resin, polyisobutylene resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin, and polystyrene resin. Ethyl acrylate copolymer resin, polyamide resin, polyurethane resin, etc. are used.

In particular, in order to prevent whitening and cracking of the plastic board, internally plasticized thermoplastic resin, such as saturated polyester, is used as the adhesive layer of the laminate included in the construction of a plastic board with poor chemical resistance such as a polycarbonate board as a transparent board. Preferred are resins, polyisobutylene resins, polyisobutylene resins, ethylene-vinyl acetate copolymer resins, and the like.

Furthermore, in the present invention, when a glass plate and a plastic plate are used as the transparent plate, the thickness of the adhesive layer is set to 200 μm or less, so that even if an external force is applied to the glass plate, the reinforcing effect of the plastic plate is maintained. is effectively transmitted to the glass plate and local deformation of the glass plate is suppressed, resulting in high impact resistance strength.

The present invention will be explained in more detail below based on the accompanying drawings.

In FIG. 1, numerals 1, 2, and 3 are glass plates or plastic plates, and an adhesive layer is fixed in advance to the adhesive side surfaces of 1 and 3 by the method described above. Of course, the adhesive layer may be fixed to both adhesive surfaces of 2 instead of the adhesive surfaces of 1 and 3.

These glass plates and/or plastic plates are supported at their lower sides by rolls 4 and rollers 5 made of heat-resistant rubber or the like in an assembly device K having an inclined conveyor, and the second and more glass plates and/or plastic plates from the bottom are It is supported by pins 7A and 7B attached to a stand 6 that can be operated from outside the airtight room, creating a gap between adjacent glass or plastic plates. The pins 7A and 7B are preferably heat resistant and do not damage glass or plastic plates, and are made of, for example, Teflon resin.

The wheels 19 of the assembly apparatus K on which the glass plate and/or plastic plate are mounted in this way are moved along the rails (not shown) provided in the airtight chamber 20 shown in FIG.

In order to tilt the glass plate and/or the plastic plate at an angle of 0 to 90 degrees relative to the horizontal plane, the entire hermetic chamber 20 or the assembly device K can generally be pivoted relative to the horizontal plane within the hermetic chamber. In addition, when using a thin glass plate such as a plastic plate with a thickness of 2 mm or less as a material for the laminate, the glass plate and/or plastic plate should be placed at an angle of 30 to 90 degrees with the horizontal plane to reduce deflection due to its own weight. It is better to tilt it so that it forms an angle.

The pressure inside the airtight chamber 20 is reduced by the vacuum pump 17. At this time, the glass plate and/or plastic plate in the heating zone 10 are heated by the heaters 13A, 13.
B heats the thermoplastic adhesive layer to a temperature below its softening point at which it does not deform or come off.

When the reduced pressure becomes 360 torr or less, preferably 160 torr or less, remove the pins 7A and 7B supporting the upper sides of the glass and/or plastic plates, and stack the glass and/or plastic plates together using their own weight to form a laminate. Assemble. Next, the airtight chamber 20 is rotated to bring the tilted assembly device K into a horizontal position as shown in FIG. The assembly 12 is then heated below the temperature limit of the plastic board and above the heat sealing temperature of the thermoplastic adhesive layer, and then, for example,
A set of rubber rolls 14 is used to crimp the assembly. The compressed laminate is introduced into the atmosphere in the take-out zone 11 to reach atmospheric pressure, and then taken out from the airtight chamber. Then, if necessary, the laminate is autoclaved to obtain a laminate without bubbles inside.

Examples will be described below.

Example 1 1 mm x 1320 mm x 1 and 3 shown in Figure 1
Using a 660 mm glass plate, apply a film of saturated polyester (manufactured by Nippon Gosei Kagaku Co., Ltd., product name ``XPA036''), which is sticky at room temperature, to the adhesion side surfaces of glass plates 1 and 3 using a commercially available film pasting machine in advance. 1A and 3A with a 60μm sheet attached. For 2 shown in Figure 1, use polycarbonate plates measuring 2 mm x 1320 mm x 660 mm, aligning the lower sides so that they almost touch each other, and using Teflon support pins 7A and 7B on the upper sides to leave a gap of about 50 m between the plates. It was placed on device K.

This assembly device was tilted in advance at an angle of about 60 degrees with respect to the horizontal plane, and then moved into the airtight chamber K while maintaining the angle. The doors 8 and 9 of the airtight chamber were closed and the pressure was reduced to approximately 50 torr using a vacuum pump. At this time, the heating zone 10 was heated to about 50°C, which is about 30°C lower than the softening point of the polyester adhesive layer.

Next, the pins 7A and 7B are removed, the glass plate and the polycarbonate plate are placed one on top of the other, the assembly is heated to approximately 110°C, and then the assembly is crimped using a pair of hollow rubber rolls 14 pressurized to 1.5 kg/cm ² . did.
After the crimping was completed, the pot 15 was opened to set the pressure to atmospheric pressure, and then the door 9 was opened and the laminate was taken out.

Thereafter, autoclave treatment was performed for 5 minutes at 120° C. and 10 kg/cm ² to obtain a bubble-free laminate.

Example 2 A 0.76 mm polyvinyl butyral sheet of the same size was placed on the adhesion side surface of one of two 2 mm x 1320 mm x 660 mm glass plates by heating at 7 locations using a soldering iron, and fixing those portions to the glass plate. Next, these two glass plates were placed on the assembly device K, moved into the airtight chamber 20, and heated to below about 80°C.
The pressure was reduced to 100 torr, pins 7A and 7B were removed, and the laminated glass was assembled. The laminated glass assembly was then heated to about 135° C. and pressed together using a pair of rubber rolls 17 at a pressure of about 1.5 kg/cm ² (G). This was opened to the atmosphere in the removal zone 11, and a laminated glass plate without any remaining bubbles was taken out.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a cross-sectional view of a laminate assembly apparatus, and FIG. 2 is a cross-sectional view of the assembly apparatus when it is placed horizontally and placed in an airtight chamber. 1, 2, 3: glass plate or plastic plate,
1A, 3A: adhesive layer, 4: support roll, 5: support roller, 6: stand, 7A, 7B: pin, 8, 9: door,
10: Heating zone, 11: Taking out zone, 12:
Assembly, 13A, 13B: Heater. 14: Pressure roll, 17: Vacuum pump, 18: Operating tool, 2
0: Airtight room.

Claims (1)

[Scope of Claims] 1. A method of manufacturing a laminate by forming an assembly in which an adhesive layer made of thermoplastic resin is interposed between a plurality of transparent plates, and heating and pressurizing the assembly, wherein the adhesive layer Place one of the transparent plates to which it is attached, or the other transparent plate, against the inclined conveyor, and align the lower end of the other transparent plate with the lower end of the transparent plate leaning against the inclined conveyor, and then place the upper end of the transparent plate against the inclined conveyor. By locking to a support pin that can be operated from outside the container to be depressurized, the transparent plates are placed on the inclined conveyor with a space between them and the adhesive layer facing inside, and the inclined conveyor is moved into the container. After reducing the pressure inside the container, the support pins are unlatched to form an assembly in which the adhesive layer is interposed between the transparent plates, and then the assembly is heated to a temperature higher than the heat sealing temperature. A method for producing a laminate, which comprises: and then crimping. 2 After forming the assembly, rotate the container or the inclined conveyor so that the inclined conveyor is horizontal, heat the assembly above the heat sealing temperature, and then move the assembly to the horizontal position. The method for manufacturing a laminate according to claim 2, wherein the laminate is sent between a pair of clamping rolls using an inclined conveyor and is crimped. 3. The method for producing a laminate according to any one of claims 1 to 2, wherein the pressure of the reduced pressure container is 360 Torr or less. 4. The method for producing a laminate according to any one of claims 1 to 3, wherein the transparent plate is a glass plate and/or a plastic plate. 5 The plastic plate is made of polycarbonate resin,
The method for manufacturing a laminate according to claim 4, which is made of any one of acrylic resin, polyvinyl chloride resin, polyester resin, cellulose resin, and polystyrene resin. 6 Claims in which the adhesive layer is made of any one of polyvinyl butyral resin, saturated polyester resin, polyisoptylene resin, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, polyamide resin, and polyurethane resin. A method for manufacturing a laminate according to any one of items 1 to 5.