JPS5843344B2 - Datsuki Press Souch - Google Patents

Description

[Detailed description of the invention] The present invention produces a laminated board in which a plurality of plate-like bodies are bonded together by heating, deaerating and pressing an assembly in which an adhesive resin layer is interposed between a plurality of plate-like bodies. The present invention relates to a degassing press device suitable for manufacturing, particularly a degassing press device suitable for manufacturing laminated glass in which a plurality of glass plates are bonded together via an adhesive resin layer.

Conventionally, a laminated board made by bonding two or more glass plates or a glass plate and a synthetic resin plate through an adhesive resin layer has the advantage that even if it breaks, the pieces will not scatter, so it is used as safety glass. It is widely used as window glass for various transportation systems and as a building material.

The manufacturing method for such laminated sheets is to use a plasticized polyvinyl butyral film (hereinafter referred to as butyral film) as the intermediate layer, heat the assembly sandwiched between two pieces of glass, and then press it between rubber rolls. After sealing the surrounding area,
This is a method of heat-pressing using an auto-crepe.

However, this method requires two steps: peripheral sealing and heat-pressing in an autoclave.

For this reason, not only is large-scale equipment required, but the process is complicated, resulting in poor yield and poor production efficiency, which inevitably increases costs.

Therefore, in recent years, a method for manufacturing laminated glass that does not require auto-creping has been proposed.

In this method, two flexible partition walls are further installed inside the vacuum box, and after the assembly is placed between the two partition walls, the assembly is heated while maintaining the entire interior of the vacuum box in a reduced pressure state. In this method, the pressure on the outside of the two partition walls is released to atmospheric pressure after the desired temperature is reached, and the assembly between the two partition walls is closed by pressure applied to the outside surface of the partition wall. .

In this method, the middle layer of the assembly is degassed in a decompression box, and then the main surface of the assembly is pressed by the pressure difference between atmospheric pressure and the middle layer, which is kept under reduced pressure, so the degassing effect is improved. It was possible to produce laminated glass with a large adhesive strength and excellent appearance.

However, implementing this method requires a lot of manual work;
The drawback was low productivity.

The present invention provides a degassing press device suitable for manufacturing laminated plates with high productivity, which improves the above-mentioned drawbacks. A transfer means for horizontally transferring the assembly with a resin layer interposed therebetween; a heating means installed in the transfer path of the transfer means for heating the assembly to be transferred; and when opened, the heated assembly is heated. a split airtight box having opening/closing means provided above and below the transfer means so as to be accessible into and out of the box by the transfer means, and one of the airtight boxes on the opposite side of the assembly from the transfer means; An air-tight flexible membrane provided in the box and, when the air-tight box is closed, an internal discussion assembly of two sealed chambers of the air-tight box separated by the air-tight flexible membrane are transferred. This degassing press device comprises means for once reducing the pressure in an airtight chamber and another airtight chamber, and then bringing the airtight chamber made of steel back to atmospheric pressure.

The degassing press device according to the first aspect of the present invention heats an assembly in which an adhesive resin layer is interposed between a plurality of plate-like bodies on a transfer means outside the airtight box, and then places the assembly in the airtight box. The airtight box is closed, the air pressure in the two airtight chambers of the airtight box is reduced to almost the same degree, the middle layer of the assembly is degassed without pressing the assembly, and then the airtight chamber where the assembly is While the pressure is reduced, the pressure in the other airtight chamber is increased to return it to atmospheric pressure, and the airtight flexible membrane presses the assembly due to the pressure difference between the airtight chambers, making it possible to bond a plurality of plate-like bodies together.

In the present invention, when a roll conveyor is used as a means of transporting the assembly, the assembly is not supported on its entire surface, so if the plate-shaped body is made of a material that is easily broken, such as a glass plate, the assembly is carried out using an airtight flexible membrane. To prevent this, it is preferable to support the assembly with a flat support that can move in and out from between the rolls of the roll conveyor when pressing the assembly with an airtight flexible membrane. .

The second invention of the present invention uses an airtight endless belt stretched by rolls as the transport means for the assembly described in the first invention, and when the airtight box is closed, the airtight After once reducing the pressure inside the three airtight chambers of the airtight box divided by a flexible membrane and an airtight endless belt, at least the airtight chamber into which the assembly is transferred and the other airtight chambers, The degassing press device for the assembly is characterized in that it has means for bringing the airtight chamber below atmospheric pressure to atmospheric pressure.

The degassing press device according to the second invention sends the heated assembly into an airtight box, closes the airtight box, and then reduces the pressure in three closed chambers of the airtight box to approximately the same level,
Degas the intermediate layer of the assembly without pressing the assembly,
Next, while the pressure in the airtight chamber where the assembly is present is reduced, the pressure in the other airtight chamber is increased to return it to atmospheric pressure, and the assembly is assembled between the airtight flexible membrane and the belt surface of the endless belt due to the differential pressure between the airtight chambers. Multiple plate-like bodies can be bonded together by sandwiching and pressing.

According to the present invention, the pressure is reduced without pressing the assembly to remove air from the adhesive resin intermediate layer of the assembly, and then the assembly is press-bonded, so that air is completely degassed from the adhesive resin intermediate layer. In addition, according to the present invention, there is provided a method for producing a laminated board without leaving any bubbles, using inexpensive equipment that skillfully combines a means for transporting the assembly and a split type airtight box having an airtight flexible membrane, and which does not require autoclaving. It can be carried out continuously, thus increasing productivity.

Furthermore, according to the second aspect of the present invention, the assembly is held and suppressed between the airtight flexible membrane and the belt surface of the flexible endless belt, and a plurality of plate-like bodies are bonded together. The pressing force acting on the assembly is uniformly applied, the thickness of the adhesive resin layer is not uneven, and the parallelism between the opposing plate bodies of the laminated plate is improved.

Furthermore, in the second aspect of the present invention, the assembly is sandwiched and pressed between the airtight flexible membrane and the belt surface of the flexible endless belt, so that the plate-like bodies constituting the assembly are made of glass. Even if the material is easily broken, there is no risk of it breaking because no concentrated pressing force is applied to the plate-shaped body.

Embodiments of the present invention shown in the drawings will be described in detail below.

The assembly in which the butyral film 2 is sandwiched between two glasses 1 and 1' is moved to a preheating zone 4 by a roller conveyor 3.
Heat the butyral film temperature to 80-90°C.

Next, the assembly is moved onto the airtight belt 6 heated by the belt heating zone 5, and the butyral film temperature is further heated to 90 to 130° C. by the heating zone 7.

Next, the airtight upper box 8 is raised by the hydraulic cylinder 9, and the assembly is moved into the airtight box.

As shown in FIG. 2, the flexible membrane 10 made of rubber is heated in advance by being brought into contact with the upper box heating zone 12 by evacuating it from the upper exhaust port 11 with a vacuum pump, which is a pressure adjusting means. The hydraulic cylinder 9 is actuated to lower the depressurized upper box 8 and align it with the airtight lower box 13 as shown in FIG.

In this state, the inside of the airtight box is completely isolated from the outside air by the gasket 14.

At the same time, the inside of the airtight box is divided into three airtight chambers by the partition wall 10 and the belt 6.

Next, while the upper box exhaust port 11 is maintained at a reduced pressure, exhaust pressure is reduced through the lower box exhaust port 15 and the differential pressure exhaust port 16.

The time required for this pressure reduction is several seconds if a preliminary vacuum tank is used.

When the desired degree of depressurization is reached, the upper box exhaust port 11 and the lower box exhaust port 15 are opened to atmospheric pressure while the differential pressure exhaust port 16 is kept in a reduced pressure state, and the glass assembly can be moved as shown in FIG. The outer surfaces of the flexible membrane 10 and the belt 6 are pressed and bonded together by the applied atmospheric pressure.

Next, the differential pressure outlet 16 is opened to atmospheric pressure, and the airtight upper box 8 is raised by actuating the hydraulic cylinder 9 to move the assembly to the final heating zone 17.

In this state, the laminated glass is already transparent, but when it is further heated to 110 to 150°C in the final heating zone 17, distortions caused by pressure bonding and minute vacuum bubbles are removed, and a perfect laminated glass is completed.

A, N, and S laminated glasses manufactured using this equipment.

The results of the Boil test specified in IZ-26, 1 are shown in the table below, and there were no defective products.

In the apparatus of the present invention, continuous production of laminated glass, which has been difficult in the past, can be easily carried out using simple equipment by using an airtight moving belt.

In addition, using this equipment, transparent laminated glass can be manufactured just by processing the airtight box, so there is no need for the conventionally complicated process of auto-creping after temporary bonding. This has the advantage of not only requiring less equipment costs but also improving productivity.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the device of the present invention,
FIG. 2 is a partially sectional side view of the entire device. 2 and 3 are partial cross-sectional views of the airtight box, FIG. 2 is a partial cross-sectional view during depressurization, and FIG. 3 is a cross-sectional view during crimping. 1 t 1' glass, 2: Butyral membrane, 3: Roller conveyor, 4: Preheating zone, 5: Belt heating zone, 6
: Belt, 7: Heating zone, 8: Airtight upper box, 9: Hydraulic cylinder, 10: Flexible membrane, 11: Upper box exhaust port, 12: Upper box heating zone, 13: Airtight lower box, 1
4: Gasket, 15: Lower box exhaust port, 16: Differential pressure exhaust port, 17: Final heating zone, 18: Belt/conveyor
roll.

Claims (1)

[Scope of Claims] 1. A transport means for horizontally transporting an assembly in which an adhesive resin layer is interposed between a plurality of plate-like bodies, and an assembly installed in a transport path of the transport means and transported. a split airtight box having a heating means for heating the box and an opening/closing means provided above and below the transfer means such that when opened, the heated assembly can be moved in and out of the box by the transfer means; and the assembly. an airtight flexible membrane provided in one box of the airtight box on the side opposite to the transfer means; A method for removing an airtight box assembly comprising means for once reducing the pressure in the airtight chamber into which the inner iron assembly of the two airtight chambers is transferred and in another airtight chamber and then bringing the other airtight chamber to atmospheric pressure. Air press device. 2. In the degassing press apparatus described in claim 1, an airtight endless belt stretched by rolls is used as the conveying means of the assembly, and when the airtight box is closed, the airtightness is After once reducing the pressure inside at least the three airtight chambers of the airtight box divided by the flexible membrane and the airtight endless belt, the airtight chamber into which the assembly is transferred and the other airtight chambers are depressurized. A degassing press device for the assembly, comprising means for bringing the airtight chamber to atmospheric pressure.