JPH024464B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for attaching a sheet to a molded article.

(Prior Art) As an example of a sheet attached to a molded product, there is a masking sheet that covers a part of the molded product when painting other parts. For example, the bumper of a car is
When finishing in color, a masking sheet (tape) is applied to the necessary parts of the bumper, which has been previously colored in one color, but this masking sheet is usually applied manually by an operator. In other words, the bumper has curves and other irregularities, and the masking sheet itself is thin and has almost no shape retention, so a method of mechanically grasping both ends of the masking sheet and pasting it to the bumper is recommended. Even if you try to remove it, it is extremely difficult to align the masking sheet with the unevenness of the bumper, and if you paint with insufficient masking, the border between the two colors will not be as planned.

(Purpose of the Invention) The present invention is directed to the conventional manual pasting of sheets to molded products, regardless of the case of small-scale production.
This is an attempt to solve the problem that mass production requires a large amount of labor and is therefore uneconomical. That is, the present invention aims to provide a method for mechanically and accurately attaching masking sheets, colored tapes, labels, and other sheets even to molded products with irregularities.

(Structure of the Invention) The present invention uses a mold to mold a sheet into a shape that follows the sheet pasting surface of a molded product, and while holding the sheet on the molding surface of the mold, the sheet is placed on the sheet pasting surface. By pressing the
Taking advantage of the fact that the above-mentioned molding surface has a concavity and convexity relationship opposite to that of the sheet pasting surface and fits into the sheet pasting surface, the sheet is brought into even contact with the entire sheet pasting surface on this molding surface, and the sheet is molded. This aims to improve the adhesion of the sheet to the product and automate the sheet pasting process.

That is, the method of pasting a sheet to a molded product according to the present invention involves feeding a sheet to a mold having a molding surface having a concavity and convexity relationship reversed to that of the sheet pasting surface of the molded product;
By bringing the sheet into close contact with the molding surface, this sheet is molded into a shape that follows the sheet pasting surface, and the molded sheet is held in the mold while being brought into close contact with the molding surface. The method is characterized in that the sheet is attached to a molded article by pressing the molded sheet against the sheet attachment surface of the molded article using a mold.

Therefore, in the above-mentioned sheet pasting method, since the sheet molded by the mold follows the shape of the sheet pasting surface of the molded product, it easily conforms to the uneven molded product. Then, the formed sheet is pressed against the sheet attachment surface of the molded product by the mold while being held on the molding surface without separating from the molding surface of the mold, so that the operator can There is no need to separately hold the molded sheet, and since the molding surface has a concavity and convexity relationship reverse to that of the sheet pasting surface and fits into the sheet pasting surface, the sheet can be pressed against the sheet pasting surface by the operator. At the very least, the entire sheet will be in even contact with the surface to which it is applied.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. Figure 1 shows an automobile bumper 1 shown in Figure 2.
A device for applying the masking sheet 2 to the masking sheet 2 is shown. The bumper 1 of this example is made of synthetic resin, and the sheet 2 is made of thermoplastic resin and has a thin thickness of about 10 μm. In addition, in the case of this example, the masking sheet 2 is attached to the sheet pasting surface 4 of the bumper 1 on the upper side of the boundary 3 shown by the chain line in FIG.
can be pasted on.

Now, in the above-mentioned pasting device, 5 is a drum on which the sheet 2 is wound, and the flat sheet 2 is placed in the sheet supply path under the drum 5 and is gradually curved downward along the bent portions on both the left and right sides of the bumper 1. A guiding guide 6 and a heating furnace 7 are provided, and furthermore, a molding position for molding the sheet 2 is provided below. The guide 6 extends through the heating furnace 7 to just before the sheet forming position, and the sheet 2 is moved to the forming position while holding both side edges of the sheet 2 with rotating rollers on both sides of the guide 6 (both sides in the left-right direction of the bumper). A supply device (not shown) is provided.

At the above-mentioned molding position, the main mold 10 and the sub-mold 11, each having a center of rotation formed by pins 8 and 9 on both sides thereof, can rotate to face each other. That is, the main mold 10 has a molding surface formed so that the unevenness is opposite to that of the sheet attachment surface 4 of the bumper 1, as shown on the right side in FIG. It is attached to a piston rod 13 of a cylinder device 12 which is rotatable. The molding surface of the main mold 10 has a large number of micropores made of a porous material, and a joint 14 connected to a vacuum pump is provided at the back of the main molding surface 10.

On the other hand, the auxiliary mold 11 is a flat plate that comes into contact with the periphery of the molding surface of the main mold 10 to create a sealed space, and a vent hole 15 is provided therethrough, and a compressor is connected to the vent hole 15. , a cylinder device 17 rotatably supported by the pin 9
It is attached to the piston rod 18 of. In addition, the sub mold 11 has a cutter 1 that can protrude horizontally directly above the molding surface of the main mold 10 at the molding position.
9 is attached, and a backing plate 20 against which the cutting edge of the cutter 19 comes into contact is provided in the direction in which the cutter 19 protrudes. Note that this patch plate 20 may be provided integrally with the main mold 10.

Further, on both sides of the cutter 19 of the sub-molding die 11, mounting surfaces 22 for the double-sided adhesive tape 21 are provided, which face the upper edge of the forming surface of the main forming die 10 and the patch plate 20 at the forming position. . This mounting surface 22 is formed of a material such as Delrin (acetal resin) or nylon, which has lower adhesion to the adhesive tape 21 than the sheet described above. Further, the cutter 19 is equipped with a heater for increasing the temperature of the cutting edge and electromagnetic means for advancing and retracting the cutter.

A rotating cylinder device 23 for rotating the main mold 10 between a molding position and a sheet pasting position is connected to the cylinder device 12 of the main mold 10, and a cylinder device 17 of the sub mold 11 is connected to is a rotating cylinder device 24 for rotating this sub-molding mold 11 between the molding position and the adhesive tape mounting position.
are connected. The sheet pasting position is on the conveyance line of the bumper 1, and the bumper 1 is positioned at this sheet pasting position.

Next, a method of attaching the sheet 2 to the bumper 1 using the sheet attaching apparatus described above will be explained.

The sheet 2 wound around the drum 5 is preformed by a feeding device (not shown) through a guide 6 and a heating furnace 7 to a state close to the shape of the sheet attachment surface 4 of the bumper 1, and heated at 80 to 120°C. The material is heated to a certain temperature and then supplied to the molding position. This supply is a pitch feed according to the dimensions of the sheet pasting surface 4.

On the other hand, the main mold 10 and the auxiliary mold 11 are opposed to each other with a gap in the molding position by the operation of rotation cylinder devices 23 and 24. In this case, the adhesive tape 21 is attached to the sub mold 11 in advance at the adhesive tape attachment position.

When the sheet 2 is preformed and supplied to the molding position, the main mold 10 and the sub mold 1
1 are advanced so that they come into contact with each other, and the adhesive tape 21 is adhered to the sheet 2. Then, pressurized air is supplied into the mold from the side of the auxiliary mold 11 to bring the sheet 2 into close contact with the molding surface of the main mold 10, thereby forming the sheet 2. At the same time, the sheet 2 is molded by operating the vacuum pump on the main mold 10 side. , this sheet 2 is suctioned and held on the molding surface.

Next, the cutter 19 is moved forward and the cutting edge is brought into contact with the backing plate 20 to separate the formed portion of the sheet 2 from the unformed portion. At this time, the adhesive tape 21 is also separated into the molded portion side and the unformed portion side of the sheet 2 at the same time. The purpose of heating the cutting edge of the cutter 19 is to facilitate cutting of the sheet 2 and adhesive tape 21.

Then, the main mold 10 and the sub mold 11 are moved back away from each other and rotated to the sheet application position and the tape application position, respectively. At this time, the adhesive tape 21 that has been cut off remains attached to the sheet 2 side because the mounting surface 22 of the sub-molding mold 11 has lower adhesiveness. The adhesive tape 21 remaining on the unformed portion of the sheet 2 is used to attach one side of the sheet 2 to be formed next to the bumper 1. The adhesive tape 21 that has been removed and the adhesive tape 21 that has been separated this time are attached to both side edges. Further, the sheet forming portion 2a rotates together with the main mold 10 to the sheet pasting position while maintaining a state in close contact with the molding surface of the main mold 10 as the vacuum pump continues to operate.

Next, when the main mold 10 is lowered and the sheet molded portion 2a is pressed against the bumper 1 positioned at the sheet pasting position, the sheet molded portion 2a is attached to the sheet of the bumper 1 by the adhesive tape 21 on both sides of the sheet molded portion 2a. It is pasted on the pasting surface 4 and released from the main mold 10.

By repeating the above series of operations, continuous sheets 2 are sequentially formed, separated, and pasted onto the bumper 1, and this bumper 1 is painted in the painting process so that only the sheet pasting surface 4 has a base color. Finished in two colors as left.

In the above embodiment, a method was adopted in which the adhesive tape 21 was attached to the sheet 2 at the molding position. A lining method may also be adopted.

In addition, in the above embodiment, a continuous sheet was fed to a mold and the molded portion was separated, but it is also possible to feed a sheet cut in advance to match the dimensions of the sheet pasting surface to the mold and mold it. may be attached to the molded product.

Furthermore, although the above embodiments relate to the application of a masking sheet for painting, the present invention is also applicable to cases in which a colored sheet or tape made of synthetic resin or paper is applied to a molded product to give it a multi-colored finish, or to affix a label. It can be applied in cases where

(Effects of the Invention) According to the present invention, a sheet is molded into a shape that follows the sheet attachment surface of a molded product using a mold, and while the sheet is held on the molding surface of the mold, the sheet is Since the sheet is pressed against the sheet application surface, the sheet can be brought into even contact with the entire sheet application surface without the operator having to separately hold the sheet or press it against the sheet application surface. This makes it possible to apply the sheet at an accurate position along the uneven or curved surface of the sheet application surface and in a relatively short time.It also makes it possible to automate the sheet application work, improving productivity. can be achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram of a sheet pasting device, and FIG. 2 is a perspective view of a bumper. 1... Bumper (molded product), 2... Sheet, 2
a... Sheet molding part, 4... Sheet pasting surface, 1
0...Main mold, 19...Katsuta.

Claims (1)

[Claims] 1. A method of attaching a sheet to a molded product, which involves supplying the sheet to a mold having a molding surface with a concavo-convex relationship opposite to that of the sheet-applying surface of the molded product, and bringing the sheet into close contact with the molding surface. A sheet is formed into a shape that follows the above-mentioned sheet pasting surface, and this formed sheet is held in the above-mentioned mold while being in close contact with the above-mentioned molding surface, and the above-mentioned formed sheet is molded using this mold. A method for attaching a sheet to a molded article, the method comprising attaching the sheet to the molded article by pressing the sheet against the sheet attachment surface of the article.