JPH0315547A - Adhesion molding method - Google Patents

Abstract

PURPOSE:To bond a coating sheet material even to an object to be coated having a wide flat surface without involving air by pressing the coating sheet material to the object to be coated by a press means when the object to be coated is coated with the coating sheet material. CONSTITUTION:At first, an upper vacuum box 6 is opened and an object 1 to be coated is held to the upper part of the holder 5 provided to a lift table 4. Next, a coating sheet material 2 is placed on a frame body 10 and the upper surface of a lower vacuum box 7 is covered with the upper vacuum box 6. The lower end of the press jig 3a of a press means 3 is positioned under the coating sheet material 2 and the coating sheet material 2 is brought to a state slightly pressed downwardly by the lower end of the press jig 3a. Subsequently, the air in the boxes 6, 7 is sucked from both vent holes 8, 9 to evacuate the upper and lower vacuum boxes 6, 7. Subsequently, the lift table 4 is raised to position the object 1 to be coated on the upper side of the coating sheet material 2 and the press jig 3a is upwardly pressed by the object 1 to be coated to be retracted and the object 1 to be coated is coated with the coating sheet material 12.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method of adhesion molding for adhering a covering sheet material to the outer surface of an adherend with good adhesion, and in particular, the present invention relates to an adhesion molding method for adhering a covering sheet material to the outer surface of an adherend with good adhesion. The present invention relates to a close-fitting rectangular square that can coat the surface of an adherend with a material.

(Prior art) An upper vacuum box equipped with a heating member inside and a lower vacuum box equipped with a vertically variable adherend mounting section are arranged vertically, and a A method of coating an adherend with a covering sheet material by placing a spreadable covering sheet material, and raising the lower adherend mounting part by setting the upper and lower vacuum boxes in a vacuum state is as follows:
This method has been conventionally known as a vacuum forming method, and according to this method, a spreadable covering sheet material can be attached (packaged) to an adherend with good adhesion.

Furthermore, Japanese Patent Publication No. 57-27009 discloses that in a vacuum seal packaging method, a heating heater having a concave portion opening downwardly is provided on the upper surface of a sheet material, and this heater is used to form a convex portion protruding upward in the sheet material. After shaping and coating the top surface of the adherend with this sheet material, the vacuum box that houses the adherend is reduced in pressure to effectively remove the gas existing between the sheet material and the adherend. A method has been proposed.

1 2 (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 unevenness on the surface, and the method disclosed in the above publication Even in the method described above, when a sheet material is attached to an adherend having an uneven surface, the sheet material can be applied without wrinkles.

However, in any of the above methods, when a sheet material is attached to an adherend having a wide flat surface, the sheet material placed on the surface of the adherend comes into contact with at least a part of the surface. In this case, a sealed space surrounded by the sheet material and the surface of the adherend is formed, especially in the center of the surface, and the air in this space is difficult to be removed to the outside even in the above-mentioned reduced pressure state, resulting in a foamed state. This greatly impaired the appearance of the covering.

The present invention has solved the above-mentioned problems, and its purpose is to provide a contact molding method that can apply a covering sheet material to an adherend having a wide flat surface without entraining air. There is a particular thing.

(Means for Solving the Problems) In the contact molding method of the present invention, a covering sheet material and an adherend are disposed so as to be close to each other, and at least one of the covering sheet material or the adherend is moved in a direction in which they approach each other. In a contact molding method in which a covering sheet material is applied to an adherend by moving the covering sheet material, a pressing means that can move in and out toward the covering sheet material side is disposed on the opposite side of the covering sheet material from the adherend. established,
The present invention is characterized in that when the covering sheet material is applied to the adherend, the covering sheet material is pressed toward the adherend by a pressing means, 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 contact molding method of the present invention. Box 6. A pressing means 3 is attached to the lower surface of the lid 6a of the upper vacuum box 6.

This pressing means 3 has a base 3b and a pressing tool 3a that is inserted into the base 3b and can move in and out downward from the lower surface of the base 3b. A driving means such as a gas cylinder may be provided in the base 3b to manually or automatically drive the pressing tool 3a up and down, and it is preferable to drive it in synchronization with the raising and lowering of the lifting platform 4.

The lower vacuum box 7 is provided with an elevating table 4 that allows the adherend 1 to be raised and lowered, and a holder 5 for holding the adherend 1 is attached to the upper surface of the elevating table 4. When using a dish-shaped member or a cylinder with a bottom as the covering l, insert the holder 5 into the adherend 1 from the lower opening of the adherend 1,
The upper end of the adherend 1 is held by bringing it into contact with the bottom surface of the adherend 1. A frame portion 10 for holding the periphery of the covering sheet material 2 is provided at the upper end of the lower vacuum box 7. Further, the upper vacuum box 6 and the lower vacuum box 7 are provided with ventilation holes 8 and 9, respectively.
A vacuum degassing device is connected to 9 through a valve, so that the insides of the upper vacuum box 6 and the lower vacuum box 7 can be vacuum degassed 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 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 10, and the upper vacuum box 6 is placed over the upper surface of the lower vacuum box 7. The lower end of the pressing tool 3a of the pressing means 3 is located below the covering sheet material 2, and as shown in FIG. 2(a), the lower end of the pressing tool 3a slightly presses the covering sheet material 2 downward. The state will be as follows. Next, by sucking the air inside through both the vents 8 and 9, the insides of the upper vacuum box 6 and the lower vacuum box 7 are evacuated. Next, Fig. 2(b)
As shown in the figure, by raising the lifting platform 4 and positioning the adherend 1 above the covering sheet material 2, the press tool 3a is pressed upward by the adherend 1 and evacuated. At the same time, the adherend 1 is covered with the covering sheet material 2. Next, by opening the valve, external air is allowed to flow in through both vents 8 and 9, the vacuum in the upper and lower vacuum boxes 6 and 7 is released, and the covering is taken out.

The covering sheet material 2 used in the present invention is preferably a material whose sheet has a spreadability 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 adherend 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-vinyl alcohol, ethylene-vinyl acetate, ethylene-vinyl acetate carbon monoxide, etc. Fluororesins such as polystyrene, vinyl polyfluoride and polyvinylidene fluoride, acrylic resins, urethane resins, etc.

■Elastomers: Acrylic rubber, chloroprene rubber (natural rubber), butadiene rubber, etc. ■Thermosetting resins: Uncured or semi-cured materials consisting of acrylic polyol and pro-isocyanate, or acrylic resin and reactive monomers. uncured and semi-cured materials, including

■Photocurable resin, etc.

■Leathers made from animal or synthetic resin, etc.

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

According to the above method, when the covering sheet material 2 is applied to the adherend 1, the covering sheet material 2 is pressed downward by the suppressor 3a, so that the pressed part of the sheet material 2 is pushed downward. This protrusion first comes into contact with the surface of the adherend 1, and then as the adherend 1 rises, the surrounding sheet material 2 gradually comes into contact with the surface of the adherend 1. Air is not trapped between the sheet material 2 and the surface of the adherend 1.

Note that in the above, both the upper vacuum box 6 and the lower vacuum box 7 are evacuated, but the above operation may be performed at normal pressure, and only the lower vacuum box 7 on the adherend 1 side is evacuated. A vacuum contact molding method in which the lower vacuum box 7 is exposed to the atmosphere and the inside of the upper vacuum box 6 is pressurized to apply a sheet, or the vacuum contact molding method described above. A molding method using a combination of molding and pressure molding may also be adopted. The present invention can also be applied to packaging molding in which another sheet material is placed on the lower surface of the adherend 1 and the sheet material is attached to the lower surface of the adherend 1 in the same manner as described above.

FIG. 3 shows another embodiment of the pressing means 3, and the pressing tool 3a shown in FIG. 3(a) is made of an elastic material such as rubber and has a spherical lower end. The pressing tool 3a shown in FIG. 3(1)) has a spherical elastic body 3d provided at the lower end of a bar 3c.

Furthermore, the suppressing means 3 shown in FIG. 3(C) has a pressing tool 3a attached to the lower end of a telescopic member such as a pantograph. In addition, a spring or the like is installed inside the base 3b,
The pressing tool 3a may protrude downward by a predetermined amount when no pressing force is applied from below, and may retract into the base 3b when the pressing force is applied.

In this way, when the pressing tool 3a is made of an elastic body or its lower end is formed into a spherical shape, it can be pressed without damaging the covering sheet material 2.

When the pressing means 3 is formed of a stretchable member or an elastic body, there is no problem even if the rising timing of the adherend 1 and the rising timing of the suppressing means 3 are slightly different from each other. In addition, by forming the pressing tool 3a with a material that easily deforms in response to external stress, the sheet material 2 can be applied easily and with relatively equal pressure when the sheet material 2 is applied to the adherend l. In this case, the pressing means 3 may be fixed to the upper vacuum box 6 or the like.

Further, the shape, dimensions, etc. of the suppressing means 3 can be changed as appropriate, and a plurality of pressing tools 3a may be provided and their lengths may be changed. For example, when the surface area of the adherend 1 is large, the length of the suppressor located at the center of the surface of the adherend 1 is taken as the long dimension, and the length of the suppressor 3a around the center suppressor is -9 10 may be formed so that the length is gradually shortened. The sheet material 2 may be attached to the frame 10 via an elastic member.

(Example) Next, the present invention will be explained based on examples.

Vacuum contact molding machine (vertical 300 x horizontal 300 x
Height 80 (1mm: Lifting platform stroke length 200mm
- the distance between the seat and the surface of the platform during descent) was used. The central lower surface of the lid of the upper vacuum box of this vacuum contact molding machine has a length of 80 mm that rises in synchronization with the lifting platform after contacting the adherend.
A press rod of mm was attached. A dish-shaped adherend was set on the lifting platform of the above-mentioned molding machine so that the bottom surface was facing upward. The dimensions of this adherend are a radius of 120 mm on the opening side and a radius of 6 mm on the bottom surface.
It was 0 mm and the depth was 60 mm.

Next, acrylic polyol (manufactured by Nippon Shokubai Chemical Co., Ltd., 7o
Tan 145, weight average molecular weight 339,000. ．． Tg4
0°C, OH value 80) 100 parts by weight and blocked isocyanate (Coronate 151, manufactured by Nippon Boriurekun Kogyo Co., Ltd.)
3.NGO=10. An uncured thermosetting resin sheet consisting of 47 parts by weight (2%) was set in the frame of the molding machine, and the upper vacuum box was closed. At this time, the pressing rod pressed the sheet downward by 70 mm, and the distance between the sheet and the adherend was about 30 mm.

Next, the inside of the upper and lower vacuum boxes was evacuated, and when the final vacuum level reached 8 Torr, the lifting platform was moved to 60 Torr.
The resin sheet was applied to the adherend by raising the pressure at a speed of mm/min, and then the upper and lower vacuum boxes were opened to normal pressure and the coated body was taken out.

The appearance of the obtained coated body was visually observed, and the coated body was left in an atmosphere of 800°C, and the foaming state of the sheet material was visually observed. The results are shown in Table 1.

A vacuum contact molding machine similar to that used in Example 1 was used, and a length that rose in synchronization with the lifting platform after contacting the adherend was placed on the lower surface of the center of the lid of the upper vacuum box of this molding machine. A 110 mm press rod was attached, and four 80 mm long press rods were attached at positions 30 mm apart on all four sides of the rod, each having a length of 80 mm and rising in synchronization with the lifting platform after contacting the adherend in the same manner as the central press rod.

11 I2 A dish-shaped adherend having the same dimensions as in Example 1 was set on the lifting table of the molding machine so that the bottom surface was facing upward.

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, with the adhesive on the bottom side. After setting as shown, close the upper vacuum box of the molding machine.

At this time, the center pressing rod pressed the sheet downward by 100 mm, and the sheet and adherend were in contact with each other. Next, the inside of the upper and lower vacuum boxes are evacuated, and when the ultimate vacuum level reaches 8 Torr, the lifting platform is raised to attach a soft vinyl chloride resin adhesive sheet to the adherend, and then the upper and lower vacuum boxes are evacuated. The inside was opened to normal pressure and the covering was taken out.

The obtained coating was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

A coated body was obtained in the same manner as in Example 1, except that a molding machine without a pressing rod was used.

The obtained coating was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Table 1 As shown in Table 1, air pockets were generated in the coated body obtained in the comparative example, and furthermore, foaming occurred throughout the coated body when heated.

On the other hand, the coated bodies of Examples 1 and 2 showed no centering and had a good appearance.

(Effects of the Invention) According to the present invention, the covering sheet material is pressed toward the adherend by the suppressing means, and after the suppressed portion of the sheet material is brought into contact with a part of the surface of the adherend, the sheet material is moved toward the periphery. Since the material can be applied to the entire surface of the adherend, there is no air trapped between the sheet material and the surface of the adherend. The sheet material can also be attached to the body with good adhesion.

13]4 Therefore, when pasting sheet materials such as painted sheets, adhesive sheets, and non-woven fabrics, it not only provides excellent appearance after pasting, but also eliminates air between the adherend and the sheet material. It is possible to suppress changes caused by oxygen or the like on the surface of the adherend, such as the occurrence of rust. Furthermore, in a retort pack, since the air contained inside is reduced, the freshness of the food inside can be maintained for a long period of time.

4. Oh no! I Figure 1 is a schematic explanatory diagram of the cutting device used in the present invention, Figures 2 (a) and (b) are explanatory diagrams of the molding method of the present invention, and Figures 3 (a) to (C) are press 3 is a schematic diagram of another example of means; FIG.

1... Adherent, 2... Covering sheet material, 3...
means of suppression.

1st that's all

Claims (1)

[Claims] 1. The covering sheet material and the adherend are arranged so as to be close to each other,
In a contact molding method in which the covering sheet material is applied to the adherend by moving at least one of the covering sheet material or the adherend in a direction in which the covering sheet material or the adherend is moved toward each other, A pressing means that can be moved in and out toward the covering sheet material side is disposed, and when applying the covering sheet material to the adherend, the pressing means is configured to press the covering sheet material toward the adherend. Features a contact molding method.