JPH0315549A - Adhesion molding method - Google Patents

Abstract

PURPOSE:To improve appearance by coating the rear part of an object to be coated with a sheet material, to enhance handling properties and to also enhance productivity and product value by raising the pressure in a high pressure space to press a press sheet to the object to be coated. CONSTITUTION:A press sheet is mounted to the under surface of a cylindrical body 21 and the upper surface of the object 1 to be coated covered with a coating sheet material 2 is covered with said cylindrical body 21 and the mounting member 22 of the cylindrical body 21 is brought into contact with the upper surface of a lift table 4 to form a space part between the lift table 4 and the cylindrical body 21. The space part becomes a state partitioned up and down by the press sheet 11 and a high pressure space part 24 is formed on the side of the cylindrical body 21 and a low pressure space part 25 is formed on the side of the lift table 4. The press sheet 11 expands toward the low pressure space part 25 by the pressure difference between the high and low pressure space parts 24, 25 to press the coating sheet material 2 to the surface of the object 1 to be coated. At the same time, the press sheet 11 is largely deformed toward the low pressure space part 25 even on the peripheral end side of the object 1 to be coated to be guided to the rear part of the object 1 to be coated along with the sheet material 2.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of adhering a covering sheet material to the outer surface of an adherend with good adhesion and molding it, and in particular, the present invention relates to a method of adhering a covering sheet material to the outer surface of an adherend and molding it in close contact. The present invention relates to a close contact molding method that allows the adhesive to be pasted from the front surface to the back surface.

(Prior art) An upper vacuum box and a lower vacuum box provided with a vertically variable deposition resting section are arranged vertically, and a coating sheet material is arranged between the upper and lower vacuum boxes, The method of coating an adherend with a coating sheet material by raising the lower adherend mounting part while creating a vacuum state in the upper and lower vacuum boxes is conventionally known as a vacuum forming method, and this method According to this method, the covering sheet material can be attached (packaged) to an adherend with good adhesion. In addition, Japanese Patent Publication No. 58-13352 discloses that when coating an adherend with a covering sheet material, vacuum suction is applied to the adherend side and high pressure is applied to the covering sheet material side. Methods have been proposed for successfully depositing materials on the outer surface of adherends.

(Problems to be Solved by the Invention) In the conventional vacuum adhesion method described above, a sheet material can be attached with good adhesion to the surface of an adherend having some irregularities on the surface. =2 The sheet material can also be attached to the surface of the adherend with even better adhesion.

However, in any of the above methods, the sheet material may stick to the mounting table on which the adherend is placed before it wraps around the back side of the adherend, and the back side of the adherend may It was not possible to attach it to the section. In particular, in the above publication, since the covering sheet material is coated with the adherend placed on a mounting table with a flat surface,
It was not possible to cover the back side of the adherend with the sheet material.

Therefore, in the conventional method, after cutting the end of the sheet material on the back side of the adherend, it is necessary to treat the back side of the adherend with painting, etc., which is low in productivity and spoils the appearance. Ta.

The present invention has solved the above problem, and its purpose is to be able to stick the edge of the covering sheet material to the back side of the adherend, and to post-process the back side of the covering body. It is an object of the present invention to provide a contact molding method that can improve productivity and appearance without the need for contact molding.

(Means for Solving the Problems) The close-contact forming method of the present invention partitions a hook with an elastic pressing sheet to form a high-pressure space on one side and a low-pressure space on the other side. Then, the adherend covered with the covering sheet material is arranged in the low pressure space so that the covering sheet material is on the pressing sheet side, and the pressure inside the high pressure space is higher than that inside the low pressure space. This method is characterized in that the covering sheet material is pressed by the pressing sheet to adhere the covering sheet material from the front surface to the back surface of the adherend, thereby achieving the above object.

The contact molding method of the present invention will be explained below with reference to the drawings.

FIG. 1 shows an example of an apparatus used in the molding method of the present invention. This molding apparatus includes a first box 10 consisting of a lower vacuum box 7 whose top surface is open, an upper vacuum box 6 that is attached to the upper surface of the lower vacuum box 7 so as to be openable and closable, and a second box 20 that will be described later. .

-3 4 The lower vacuum ponox 7 is provided with an elevating table 4 that allows the adherend 1 to be raised and lowered freely, and a holder 5 for holding the adherend 1 is attached to the upper surface of the elevating table 4. When the adherend 1 is placed on the upper part of the halter 5, the periphery of the back surface of the adherend 1 is exposed downward. When using a bottomed cylinder or a dish-shaped object as the adherend 1, the adherend 1 is held by bringing the upper end of the holder 5 into contact with the bottom surface of the adherend 1 so that its surface faces downward. It is something to do.

A frame 15 for holding the periphery of the covering sheet material 2 is provided at the upper end of the lower vacuum box 7 . The side walls of the upper vacuum box 6 and the lower vacuum box 7 are provided with vents 8as, 8bs, 9a, 9b.
, 9a are connected to a vacuum pump 16 via a valve 13, so that the inside of the upper vacuum box 6 and the lower vacuum box 7 can be evacuated or brought to normal pressure as appropriate. Note that a heater may be provided on the inner surface of the upper vacuum box 6 and/or the lower vacuum box 7 to heat and soften the covering sheet material 2.

The second box 20 described above is composed of the lifting table 4 and a cylindrical body 21 having an opening at the bottom and disposed on the upper surface of the lifting table 4 so as to surround the adherend 1. A mounting member 22 such as a packing is attached to the lower surface around the cylindrical body 21, and a peripheral end portion of the elastic pressing sheet 11 such as a rubber sheet can be attached between the mounting member 22 and the lower surface of the cylindrical body 21. It is designed so that it can be done.

The cylinder body 2l has a gas supply port 2 for supplying gas such as high pressure air.
3 is provided, and the supply port 23 is connected to a high pressure gas supply device. Further, the elevating table 4 is provided with a deaeration port 12.

The covering body can be formed using the above-mentioned cutting device in the following manner.

First, the upper vacuum box 6 is released, and the adherend 1 is held on the upper part of the holder 5 provided on the lifting table 4. Next, the covering sheet material 2 is placed on the frame 15, the upper vacuum box 6 is placed over the upper surface of the lower vacuum box 7, and the air inside is sucked through the vents 8a and 9a to close the upper vacuum box. 6 and the lower vacuum box 7 are brought into a reduced pressure state. Here, the vacuum degree of 5-6 is preferably 50 Torr or less, more preferably 10 Torr or less. Next, by raising the lifting platform 4 and positioning the adherend 1 above the covering sheet material 2, the adherend 1 is covered with the covering sheet material 2, and then the external air is removed by opening the valve. is caused to flow through the vents 8b and 9b to bring the inside of the upper vacuum box 6 and the inside of the lower vacuum box 7 to normal pressure.

Next, as shown in FIGS. 2(a) and 2(b), a pressure sheet 11 is attached to the lower surface of the cylindrical body 21, and this cylindrical body 21 is attached to the adherend 1 covered with the sort material 2 for coating. At the same time, the mounting member 22 of the cylindrical body 21 is brought into contact with the bottom surface of the elevating table 4 to form a space between the elevating table 4 and the cylindrical body 21. The space is partitioned into upper and lower parts by the pressing sheet 11, with a high pressure space 24 being formed on the cylinder 21 side and a low pressure space 25 being formed on the lifting platform 4 side.

Next, high pressure gas is supplied into the high pressure space 24 from the gas supply port 23 . The pressure sheet 11 expands toward the low-pressure space 25 due to the pressure difference between the high-pressure space 24 and the low-pressure space 25, and simultaneously presses the covering sheet material 2 onto the surface of the adherend l. On the peripheral end side of the adherend 1, the pressing sheet 11 is largely deformed toward the low-pressure space 25, and is guided together with the sheet material 2 to the back side of the adherend 1.

As a result, the covering sheet material 2 enters the back surface of the adherend 1. Thereafter, the covering body is taken out by lowering the lifting table 4 or moving the cylinder body 21 upward.

The covering sheet material 2 used in the present invention is preferably a material that has a ductility of about 5% or more at room temperature or in a heated state, such as the following. An adhesive layer may be provided on the wearer 1 side.

■Thermoplastic resins and their foams: polyolefins such as polyethylene and polypropylene, vinyl chloride resins such as polyvinyl chloride and polyvinylidene chloride, copolymers of ethylene-pinyl alcohol, ethylene-vinyl acetate, ethylene-vinyl acetate-carbon oxide, etc. Fluororesins such as polystyrene, polyvinyl fluoride and polyvinylidene fluoride, acrylic 7-8- type resins, urethane resins, etc.

■Elastomers: acrylic rubber, chloroprene rubber (natural rubber), butadiene rubber, etc.

■ Thermosetting resin or photocurable resin: uncured or semi-cured material made of acrylic polyol and phylloc isocyanate, uncured or semi-cured material containing acrylic resin and reactive monomer, etc.

■Animal or synthetic resin leather, etc.

■Woven fabrics, non-woven fabrics, paper, etc.

Further, the pressing sheet 11 used in the present invention has elasticity and when pressed against the surface of the adherend 1,
Any material that deforms according to the surface shape can be used, such as rubber, resin foams such as sponges, rubber bags containing gas or liquid, rubber tubes, resin sheets, etc. can be given.

According to the above method, since the pressing sheet 11 has sufficient elasticity, when the high pressure space 24 is made to have a high pressure, the pressing sheet 11 is pushed to expand toward the low pressure space 25. The coating sheet material 2 is pressed toward the adherend 1 side with pressure, and therefore the sheet material 2 can be pressed against the surface of the adherend 1 with equal pressure, and as described above, the covering sheet material 2 can be pressed against the adherend 1 side. The sheet material 2 can be pasted from the front side to the back side.

In addition, in the above, in order to prevent air from forming between the adherend 1 and the sheet material 2, the upper vacuum box 6 is
Although the sheet material 2 was attached to the surface of the adherend 1 with both the interior of the lower vacuum box 7 in a vacuum state, the above operation may also be performed under normal pressure, or the sheet material 2 can be applied with only the lower vacuum box 7 evacuated. A vacuum bond forming method for bonding, a pressure forming method in which the lower vacuum box 7 is exposed to the atmosphere and the upper vacuum box 6 is pressurized to form a sheet, or the above-mentioned vacuum bond forming and pressure forming. It is also possible to adopt a method such as a cylindrical method that uses a combination of .

Furthermore, when pressing the pressing channel l1 onto the surface of the covering sheet material 2, the low pressure space 25 was opened to the atmosphere and high pressure gas was supplied into the high pressure space 24.
may be released to the atmosphere to reduce the pressure in the low pressure space 25.

9 −10= (Example) Next, the present invention will be explained based on examples.

Yukyo Dish The vacuum contact molding machine shown in Figure 1 (vertical 400 x horizontal 400 x
Height: 800 mm: Elevating table stroke length: 200 mm = distance between the seat and the elevating table surface during descent). A cylindrical holder with a diameter of 150 mm is placed on the top of the lifting table of this vacuum contact forming machine, and a cylindrical holder with a diameter of 200 mm and a depth of 30 mm is placed on the holder.
Made of steel plate with a radius of curvature of 200 mm and a thickness of 1 mm (S
The dish-shaped object of S-41) was set so that the bottom surface was facing upward. The gap between the adherend and the top surface of the elevator was 30 mm.

Next, a soft vinyl chloride resin adhesive sheet (manufactured by Sanpo Jushi Kogyo, made by laminating 30 μm of acrylic adhesive on one side of a 60 μm thick soft vinyl chloride resin sheet) was placed on the frame of the molding machine so that the adhesive was on the bottom side. After setting, the upper vacuum box of the die-forming machine was tightened.

Next, the insides of the upper and lower vacuum boxes were evacuated, and when the final vacuum reached 8 Torr, the lifting platform was raised, and then the upper vacuum box and then the lower vacuum box were opened to apply resin to the adherend. It was covered.

Next, as shown in Fig. 2(a), a cylindrical body with a 1 mm thick silicone rubber sheet (200% modulus of 1030 g at a width of 10 mm) attached to the lower surface is pressed from the upper surface of the adherend. Then, air at 1.5 atm was introduced into the cylinder and this state was maintained for 2 minutes. The rubber sheet went around from the end of the adherend to the back side, and the resin sheet was stuck to the back side of the adherend. Thereafter, the inside of the cylinder was opened to normal pressure and the coating was taken out.

The appearance of the area from the front surface to the back surface of the obtained covering was visually observed, and the length of the sheet pasted inward from the end of the covering was measured.

The results are shown in Table 1.

A coated body was obtained in the same manner as in the Example, except that the operation of pressing the silicone rubber sheet I. onto the upper surface of the adherend and pressurizing it was omitted.

The obtained coatings were evaluated in the same manner as in the examples, and the results are shown in Table 1.

1l-12 Table 1 (Effects of the Invention) According to the present invention, by increasing the pressure in the high-pressure space and pressing the divine pressure sheet toward the adherend, the pressure sheet can be applied to the surface of the adherend. At the same time, it can penetrate into the back surface of the adherend. Therefore, the back side of the adherend can be covered with a sheet material without particularly requiring complicated and expensive equipment, and the appearance of the adherend can be improved when the adherend is covered with a paint sheet, adhesive sheet, etc. In addition, it is possible to improve the handling of the covering body after processing (cutting) the sheet material at the edge, and to increase the productivity and product value of the covering body.

4. 1. Figure 1 is a schematic explanatory diagram of the molding device used in the present invention, and Figures 2 (a) and (b) are diagrams illustrating the operation of the molding method of the present invention.

l...Adherend, 2...Sheet material for coating, 1o...
- First box, l1... Pressure sheet, 2o... Second box, 24... High pressure space part, 25... Low pressure space part.

that's all

Claims (1)

[Claims] 1. Partition the box with an elastic press sheet to form a high pressure space on one side and a low pressure space on the other side, and cover the adherend covered with the covering sheet material.
The covering sheet material is arranged in the low-pressure space so as to be on the pressure sheet side, and the pressure in the high-pressure space is higher than that in the low-pressure space, so that the covering sheet material is pressed by the pressure sheet, and the covering sheet material is An adhesion molding method characterized in that the adhesive is pasted from the front surface to the back surface of an adherend.