JPH0531744A - Vacuum laminate molding method and its device - Google Patents

Abstract

PURPOSE:To prevent uneven stretch of a sheet because of the surface shape of a base by disposing oppositely a synthetic resin sheet and a base to be laminated, forming two airtight chambers through said sheet, pressing the sheet to the base by a pressing means when the sheet is heated and providing differential pressure between both chambers and vacuum laminated, and then applying differential pressure. CONSTITUTION:A closed container 4 can be opened and closed by a lower container 2 and an upper container 3. A base material W is placed on a base mounting stage 5 of air permeable structure in the lower container 2, and a decorative sheet S is stuck to a sheet installing section 8 on an open peripheral edge of container 2. Then, the upper container 3 is closed and divided into two chambers A and B. Then, the chambers A and B are vacuumized, and a heater 31 is moved forward into the chamber B on the upper container 3 side, and the sheet S is heated. Then, the base mounting stand 5 is lifted up to bring the base W into contact with the sheet S and a pressing pad 28 disposed in the chamber B is lowered are central section of the sheet S is pressed to the base material W to limit the stretch of sheet S. Then, compressed air is fed into the chamber B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum lamination molding method and apparatus, and more particularly to a vacuum lamination molding method for closely laminating a synthetic resin sheet having a pattern or the like printed on the outer surface of a substrate, and a method for carrying out this method. It relates to the equipment used.

[0002]

2. Description of the Related Art A vacuum for closely laminating a heat-traceable synthetic resin decorative sheet (synthetic resin sheet) on which a pattern or the like is printed for lamination, hot stamp transfer, etc. As one of the laminate molding methods, a base material is placed on a base material mounting table in an airtight container that can be opened and closed, and a decorative sheet is disposed facing the upper side thereof. The first chamber on the side and the second chamber on the opposite side, that is, on the upper side, are airtightly partitioned from each other, and the decorative sheet is softened by heating and the first chamber and the second chamber are decompressed to both chambers. A vacuum lamination molding method by the OVL method in which the pressure reduction in the second chamber is released to give a pressure difference between the two chambers, and the decorative sheet is adhered and laminated on the outer surface of the base material in a substantially vacuum state. Is known, and this is, for example, Japanese Patent Publication No. 56-4.
5768, and an apparatus for carrying out this method is shown in JP-A-56-99624.

[0003]

In the vacuum laminating method by the OVL method, if the extension amount of the decorative sheet is uniform over the entire sheet, the pattern of the decorative sheet is distorted,
It does not cause disorder, but if there is a difference in the amount of extension due to local extension etc., the pattern on the decorative sheet will be distorted,
Disturbances occur, which results in a poor appearance of the product.

On the other hand, in the vacuum lamination molding method by the OVL method as described above, the decorative sheet is formed by the pressure difference between the first chamber and the second chamber, in other words, the pressure reduction in the second chamber. By vacuuming, it is pressed against the outer surface of the base material and extends in a free state, so local uneven extension is likely to occur due to the influence of the outer surface shape of the base material, and thus appearance defects are likely to occur. There was a problem called.

The present invention has been made by paying attention to the above-mentioned problems in the conventional vacuum lamination molding method, and a synthetic resin sheet such as a decorative sheet is affected by the shape of the outer surface of the base material. To avoid local uneven extension,
Vacuum lamination molding method that avoids appearance defects by this and can stably produce high-quality vacuum lamination molded products,
And to provide an apparatus used for carrying out the method.

[0006]

According to the present invention, the above-mentioned object is to arrange a synthetic resin sheet to be laminated on a base material placed on a base material placing table so as to face the base material, and A first chamber is formed on the base material side and a second chamber is formed on the opposite side, and a pressure difference is applied to the first chamber and the second chamber by setting the first chamber in a depressurized state. Thus, the synthetic resin sheet is brought into close contact with the outer surface of the base material, and in the vacuum lamination molding method for laminating the synthetic resin sheet on the base material, in the first chamber and the second chamber. Prior to applying the differential pressure, the synthetic resin sheet is pressed against the base material by a pressing means from the side of the second chamber to limit the extension of the synthetic resin sheet. To be done.

Further, in order to achieve the above-mentioned object, the vacuum laminating apparatus according to the present invention has a base material mounting table, and the lamination is arranged so as to face the base material mounted on the base material mounting table. A first chamber is formed on the side of the base material mounting table from a synthetic resin sheet as a member, and a second chamber is formed on the opposite side of the sheet, and the first chamber and the first chamber are decompressed. In the vacuum lamination molding apparatus for bringing the synthetic resin sheet into close contact with the outer surface of the base material by applying a differential pressure to the two chambers, and laminating the synthetic resin sheet on the outer surface of the base material, A pressing member is provided in the second chamber so as to be able to move forward and backward with respect to the substrate mounting table.

[0008]

According to the above construction, when the differential pressure is applied between the first chamber and the second chamber to bring the synthetic resin sheet into close contact with the outer surface of the base material, the synthetic resin sheet is pressed by the pressing means. The extension is restricted by being pressed against the outer surface of the substrate.

[0009]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a vacuum lamination molding apparatus according to the present invention. The vacuum lamination molding apparatus has a closed container 4 on a base 1 that can be opened and closed by a fixed lower container 2 and a movable upper container 3.

The lower container 2 is composed of a cup-shaped container having an upper opening, and a substrate mounting table 5 having a ventilation structure is provided in the lower container 2.
Is provided. The substrate mounting table 5 is fixed to the upper end of the piston rod 7 of the fluid pressure cylinder device 6 fixed to the base 1, and is vertically moved in the lower container 2 by the fluid pressure cylinder device 6. A synthetic resin sheet mounting portion 8 is provided on the upper opening edge of the lower container 2.

The upper container 3 is fixed to the lower end of the piston rod 11 of the fluid pressure cylinder device 10 fixed to the upper frame 9, and is vertically moved by the fluid pressure cylinder device 10 to open and close the closed container 4. ing. The lower container 2 and the upper container 3 are provided with pneumatic ports 13 and 14, respectively. The pneumatic port 13 of the lower container 2 is connected to the switching valve 16 through the conduit 15, and the switching operation of the switching valve 16 selects one of the vacuum pump 17, the negative pressure from the conduit 18 and the atmospheric pressure from the atmospheric pressure port 19. Is given to each person. The air pressure port 14 of the upper container 3 is connected to the switching valve 21 via the conduit 20, and the vacuum pump 17 and the negative pressure from the conduit 22 and the pneumatic pump 2 are connected by the switching operation of the switching valve 21.
3. Either the air pressure from the conduit 24 or the atmospheric pressure from the atmospheric pressure port 25 can be selectively applied.

A fluid pressure cylinder device 26 is mounted in the upper container 3 in a vertical direction.
A pressing pad 28 is attached to the lower end of the piston rod 27 of the. The pressing pad 28 is opposed to the base material mounting table 5 and is in a raised position as illustrated by the fluid pressure cylinder device 26 and a lowered position in which the fluid pressure cylinder device 26 is lowered to contact the upper surface of the base material W on the base material mounting table 5. It is designed to move up and down between and. The pressing pad 29 has appropriate frictional resistance and elasticity such as silicone rubber, chloroprene rubber, and neoprene rubber, and has a rubber-like elastic body having a relatively low thermal conductivity so that the pressing pad 29 has a shape substantially matching the shape of the upper surface of the substrate W. It is configured to be elastically deformed according to the outer surface shape of the base material W when pressed against the base material W.

A fluid pressure cylinder device 29 is horizontally mounted near the lower portion of the upper container 3, and a seat heating heater 31 is mounted downward at the tip of a piston rod 30 of the fluid pressure cylinder device 29. Has been. In the fluid pressure cylinder device 29, the seat heating heater 31 is attached to the pressing pad 28 in the raised position and the upper opening edge of the lower container 2 by the synthetic resin sheet mounting portion 8 as shown by the phantom line in FIG. The decorative sheet S is moved between an advancing position with respect to the decorative sheet S and a retracted position retracted to the right in the figure from the advancing position as shown by the solid line in FIG.

Next, the operation of the vacuum laminating apparatus having the above construction will be described with reference to FIGS. First, the upper container 3 is moved upward by the fluid pressure cylinder device 10 and the closed container 4 is opened, and the base material W is placed on the central portion of the base material mounting table 5 in the lower container 2. The entire peripheral edge portion of the decorative sheet S is attached to the synthetic resin sheet attachment portion 8 of 2. The base material W is, for example, an inner panel for automobile interior made of ABS resin, and the outer surface of the base material W is spray-coated with, for example, about 9 g / m ^{2 of a} urethane adhesive. The decorative sheet S is a bacca PVC with a thickness of about 0.3 mm.
A laminated composite sheet of a sheet, a colored PVC sheet having a thickness of about 0.2 mm, and an acrylic sheet having a thickness of about 0.5 mm,
It may have a printed layer such as a pattern between the colored PVC sheet and the acrylic sheet.

After this, the upper container 3 is moved downward by the fluid pressure cylinder device 10 to close the closed container 4. As a result, as shown in FIG. 1, the decorative sheet S faces the base material W on the base material mounting table 5 in the closed container 4, and is placed on the base material mounting table 5 side, that is, the lower container 2 side. Room A on the other side,
That is, the second chambers B are airtightly divided from each other on the upper container 3 side.

A negative pressure of the vacuum pump 17 is applied to each of the pneumatic ports 12 and 13 by the switching operation of the switching valves 16 and 21, and the first chamber A and the second chamber B are depressurized in vacuum. In this state, the fluid pressure cylinder device 29 advances the sheet heating heater 31 between the pressing pad 28 in the raised position and the decorative sheet S, and the sheet heating heater 31 is opposed to the upper surface of the decorative sheet S. In the state, it is heated. As a result, the decorative sheet S is heated and softened.

When the heating of the decorative sheet S reaches a specified value, for example, when the temperature of the decorative sheet S reaches about 80 to 100 ° C., the heating operation of the sheet heating heater 31 is stopped, and the fluid pressure cylinder device 31 is operated. The fluid pressure cylinder device 6 is retracted from between the pressing pad 28 and the decorative sheet S by
The substrate mounting table 5 is raised by. As a result, the base material W on the base material mounting table 5 comes into contact with the decorative sheet S. At this time, as shown in FIG. 2, the pressure pad 28 is lowered by the fluid pressure cylinder device 26, and the pressure pad 28 is pressed onto the upper surface of the base material W from above the decorative sheet S. As a result, the central portion of the decorative sheet S is pressed against the upper surface of the base material W with appropriate frictional resistance, and extension is limited.

Next, by the switching operation of the switching valve 21, an air pressure of about 3 kgf / cm ² is supplied to the pneumatic port 14 from the pneumatic pump 23 to bring the second chamber B into a pressurized air state.
As a result, a large pressure difference is generated between the first chamber A and the second chamber B, and the decorative sheet S is pressed against the outer surface of the base material W by the pressure difference, as shown in FIG. While being extended, the base material W is laminated in close contact with the outer surface of the base material W.

At this time, the central portion of the decorative sheet S has a base material W.
Since the surface of the base material W is pressed against the upper surface of the base material with an appropriate frictional resistance and its extension is restricted, even if the upper surface of the base material W has unevenness, it does not extend greatly locally and the entire surface is evenly extended. become. The base material W is returned to the atmospheric pressure in each of the first chamber A and the second chamber B by the switching operation of the switching valves 16 and 21, and then the fluid pressure cylinder device 10 raises the upper container 3 to raise the closed container. Taken out by opening 4.

As the material of the decorative sheet S, polyvinyl polymers such as polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate-vinyl chloride copolymer, polyvinyl fluoride, polyvinyl butyral, polyvinylidene fluoride, polystyrene, acrylic are used. Styrene resins such as styrene and ABS, acrylic resins such as polyethylmethacrylate, polymethylmethacrylate and polyacrylonitrile, polyolefins such as polyethylene, polypropylene and polymethylpentene, cellulose derivatives such as cellulose acetate and nitrocellulose, nylon 6, Polyamide resin such as nylon 66, polyethylene terephthalate, polyethylene terephthalate-isophthalate copolymer, polybutylene terephthalate, polyester resin such as polyacrylate, butadiene, black Purengomu, rubber resin such as silicone rubber, vinylon, polyvinyl alcohol resins such Pollet vinyl alcohol, polycarbonate, and the like.

The decorative sheet S may be colored, printed with various patterns, vapor-deposited with metal or the like in order to impart a design property. Further, in order to improve the adhesiveness between the decorative sheet S and the base material W, corona discharge treatment, various known primer coatings, etc. may be performed on the sheet surface.

[0022]

As is apparent from the above description, according to the vacuum laminating method and apparatus of the present invention, a differential pressure is applied between the first chamber and the second chamber to form a synthetic resin sheet such as a decorative sheet. When the synthetic resin sheet is brought into close contact with the outer surface of the base material, the synthetic resin sheet is pressed against the outer surface of the base material by the pressing means and its extension is limited. Therefore, the synthetic resin sheet is locally affected by the shape of the outer surface of the base material. No more uneven extension,
As a result, it is possible to avoid the occurrence of a defective appearance and to stably produce a high-quality vacuum laminated molded product.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a vacuum lamination molding apparatus according to the present invention.

FIG. 2 is a process diagram showing a vacuum lamination molding process by a vacuum lamination molding apparatus according to the present invention.

FIG. 3 is a process diagram showing a vacuum lamination molding process by a vacuum lamination molding apparatus according to the present invention.

[Explanation of symbols]

1 base 2 Lower container 3 Upper container 4 closed container 5 Base material mounting table 17 Vacuum pump 23 Pneumatic pump 26 Fluid pressure cylinder device 28 Press pad W base material S makeup sheet

Claims (2)

[Claims] 1. A synthetic resin sheet to be laminated is arranged so as to face a base material placed on a base material mounting table, and a first chamber is provided on the base material side of the synthetic resin sheet and a first chamber is provided on the opposite side. Two chambers are formed respectively, and the first chamber is depressurized to provide a differential pressure between the first chamber and the second chamber, thereby bringing the synthetic resin sheet into close contact with the outer surface of the base material. In the vacuum lamination molding method for laminating the synthetic resin sheet on the base material, prior to applying a pressure difference between the first chamber and the second chamber, the side of the second chamber A vacuum lamination molding method, wherein the synthetic resin sheet is pressed against the base material by a pressing means to limit extension of the synthetic resin sheet. 2. A first chamber, which has a base material mounting table and is closer to the base material mounting table than a synthetic resin sheet as a laminated member which is arranged to face the base material mounted on the base material mounting table. A second chamber is formed on the opposite side of the second chamber, and the first chamber is depressurized to give a differential pressure to the first chamber and the second chamber to form the synthetic resin sheet as the base. In a vacuum lamination molding apparatus that adheres to the outer surface of a material and laminates the synthetic resin sheet on the outer surface of the base material, a pressing member that can move forward and backward with respect to the base material mounting table is provided in the second chamber. A vacuum laminating apparatus, which is provided.