JPH049125B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a synthetic resin composition comprising a skin made of a soft sheet and a base made of synthetic resin, the ears of the skin being bent and fixed to the back side of the base. This invention relates to a method of manufacturing a molded article. Molded products to which the present invention can be applied include pillar garnishes, consoles,
Examples include vehicle interior parts such as door trims and clusters, and furniture products such as chairs.

<Prior Art> A conventional manufacturing method for the above-mentioned type of composite resin molded product, for example in the case of a decorative plate 41 for an automobile interior as shown in FIG. 6, was as follows.

() First, as shown in Figure 6, the soft sheet S
The front side is the cavity surface (PL surface) of the female mold 51 5
A soft sheet S is stretched so as to be in contact with 2.
The soft sheet S is fed out from a feeding roll 54 with a constant tension, and the feeding end is fixed to a stopper roll 55. Here, an adhesive is usually applied to the back side of the soft sheet S, but when it is made of the same material as the base material and is integrated with the base body by heat fusion etc. at the same time as the base body molding described later. , the application of the adhesive is not necessary. In addition, the soft sheet usually does not have the ability to retain its shape at room temperature. Although the soft sheet material is not particularly limited,
In addition to thermoplastic sheets (including foam) such as PVC, PP, PE, and polyurethane sheets, PVC leather,
Coated fabrics such as PVC sponge leather, nylon coated fabrics, urethane coated fabrics, as well as non-woven fabrics,
Woven cloth etc. can be mentioned.

() Thereafter, as shown in FIG. 7, a synthetic resin material is injected into the cavity formed by fitting the female mold 51 and the male mold 56 by injection, transfer, etc., and the base body 42 is simultaneously molded. A soft sheet or skin 43 is integrated with the base body 42.
Here, as synthetic resin materials, in addition to PVC, PP, and PE, which correspond to the sheet materials mentioned above, ABS,
Examples include hard or semi-hard thermoplastic resins such as PPO and polyamide.

() Then, the soft sheet S is cut on both sides of the molds 51 and 56, and a molded product 4 having ears 44 in the skin 43 on both sides as shown in FIG.
Regarding No. 1, the decorative plate 41 was manufactured by bending and fixing the ear part 44 to the back side of the base body 42.

<Problem to be Solved by the Invention> However, the bending and fixing work of the ear portion 44 is usually performed manually by adhesive or heat welding.
Since 4 is a soft body that does not have the ability to retain its shape, it is necessary to press down and fix the edge of the ear while stretching the ear, which is troublesome and also reduces the quality of the finished product.
In particular, defects in appearance such as wrinkles were likely to occur at the portion that wraps around to the back side of the skin, that is, the bent portion B.

In view of the above, the present invention provides a composite resin that can improve the workability when bending and fixing the ears in a skin made of a soft sheet, and that can easily produce a composite resin molded product that has a uniform and good finished appearance. The purpose is to provide a method for manufacturing molded products.

<Means for Solving the Problems> In the manufacturing method according to the present invention, an outer skin made of a soft sheet covering a synthetic resin base is integrated with the base at the same time as the base is molded, and then the ears of the epidermis are formed. In the method of manufacturing a composite resin molded product, the manufacturing method includes bending and fixing a portion of the composite resin molded product to the back side of the base body, and simultaneously pressing the back side of the base body along the edge of the skin with the edge of the base body while molding the base body. The invention is characterized in that a recess-forming protrusion for forming a recess is molded integrally with the base body, and the ear end of the epidermis is pushed into the push-in recess.

<Example> Figures 1 and 2 show an example of the present invention. Decorative plate (composite resin molded product) 21 manufactured in this example
As in the past, the outer skin 23 is made of a soft sheet,
It consists of a base body 22 made of synthetic resin, and is manufactured by bending and fixing the ears 24 on the skin 23 to the back side of the base body 22.

In the skin 23, a plurality of round rods (rigid members) 26 are discontinuously integrated with the front side of the ear portion 24 along the edge of the ear portion. On the other hand, on the back surface of the base body 22, a groove forming wall 28 is formed as a recess forming projection. This groove forming wall 28 corresponds to the round bar 26 and has a tapered push-in groove 27 as a push-in recess along the edge 22a of the base body 22 and the ear portion 24.
It forms the

This groove forming wall 28 is formed by molding at the same time as the base body 22 is molded, and a similar conventional mold in which a cavity for forming the groove forming wall 28 is formed in a male die 56 is used. Use and form.

Then, this decorative plate 21 is attached to the ear part 2 of the skin 23.
4 is manufactured by pushing the round bar 26 together with the push groove 27 and fixing it.

Regarding the manufacturing of this decorative plate 21, the outer skin 2
3 is set, the mold is clamped, and the base body 22 provided with the groove forming wall 28 is molded with the skin 23 integrated, and then,
While cutting the skin 23 on both sides of the base 22,
A separately molded round bar 26 is fixed to the ear part 24 of the skin 23 by adhesive or heat welding.

After that, the ear part 24 of the skin 23 is pushed together with the round bar 26 into the push groove 27 and fixed to the base material 22, whereby the decorative plate 21 can be manufactured.

In this embodiment, when bending and fixing the ear part 24 to the back side of the base body 22, the ear part 24 is given shape retention ability by the round rod 26, The ends can be easily held down using a jig, etc.

Further, since the round bar 26, which is a rigid member, can be bent and fixed in a state in which the ear portion 24 is stretched uniformly over the entire length, appearance defects such as wrinkles are less likely to occur in the bent portion B.

Furthermore, the ears 24 of the skin 23 are pushed into the push grooves 27 using the fixed round rods 26 to form the base 2.
2, when fixing the ear part 24 of the skin 23 to the base material 22, there is no need to separately apply adhesive to the ear part 24 or heat for welding, and the fixing workability can be improved.

Although the rigid member 26 in this embodiment is separated from the base body 22, if a gate for molding the rigid member is separately provided in the mold, the rigid member can be easily molded simultaneously with the base body. Further, the outer end of the rigid member 26 need not coincide with the edge of the ear as shown in the figure, but may be slightly inside or outside as long as it is along the edge of the ear.

3 to 5 show another embodiment of the present invention, in which a round bar 26 as a rigid member is molded on the back side of the ear portion 24 of the skin 23 at the same time as the base body 22. That is, in this embodiment, as shown in FIG. 3, a mold 5 equipped with a gate 56a for forming a rigid member
Round bar 2 as a rigid member using 1A and 56A
6 and integration into the ear portion 24 are performed simultaneously with the molding of the base body 22.

In this embodiment, after molding a round bar 26 and a base body 22 having a groove forming wall 28, the skin 23 on both sides of the base body 22 is cut, and the ears 24 of the skin 23 are pushed together with the round bar 26 into the groove 22. The decorative plate 21 can be manufactured by pressing it into the base material 22 and fixing it to the base material 22.
In this embodiment, compared to the embodiments shown in FIGS.
3, the work of fixing the round bar 26 can be simplified accordingly.

In addition, in the example, a case was shown where the rigid member 26 was fixed to the ear part 24 of the epidermis 23, but
Of course, if the recess forming protrusion 28 for forming the push-in recess 27 along the ear part 24 of the skin 23 with the edge of the base 22 is formed integrally with the base 22 on the back side of the base 22, the push-in recess can be formed. Within 27, epidermis 2
The outer skin 23 can be fixed by pushing in the end of the ear part 24 of No. 3, which is easier than the conventional fixing operation, so it is not necessary to fix the rigid member 26 to the ear part 24.

<Operations and Effects of the Invention> In the method for manufacturing a composite resin molded product of the present invention, a soft sheet skin covering a synthetic resin base is integrated with the base at the same time as the base is molded, and then the ear portions of the skin are formed into one piece. When manufacturing by bending and fixing to the back side of the base material, at the same time when molding the base material, a recess forming protrusion is placed on the back side of the base material to form a push-in recess along the edge of the skin with the edge of the base material. Then, press the ear end of the skin into the recess.
It is manufactured by pressing.

That is, when bending and fixing the ears of the skin to the back side of the base, the skin can be fixed by sequentially pushing the ears of the skin into the push-in recesses of the base that are formed along the ends of the ears of the skin.

Therefore, it is easy to press the edge of the ear while tensioning the ear, and there is no need to hold the ear on the skin until the adhesive dries, as is the case with conventional methods. The workability of bending and fixing to the back side of the base body is improved.

In addition, since the ears of the epidermis are successively pushed into the push-in recesses of the base that are formed along the edges of the ears of the epidermis, the ears can be fixed while being stretched uniformly over approximately the entire length in the longitudinal direction. , appearance defects such as wrinkles are less likely to occur at the bent portion, that is, the finished appearance of the molded product is uniform and beautiful.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the back side of a molded product manufactured according to an embodiment of the present invention before the ear portions are fixed. FIG. 2 is a half-end view of the molded product shown in FIG. 1 after the ears are bent and fixed. FIG. 3 is a schematic cross-sectional view of a mold during manufacturing in another embodiment. Figure 4 shows
FIG. 3 is a perspective view of the back side of the molded product manufactured in the same example before the ear portions are fixed. FIG. 5 is a half-end view of the molded product shown in FIG. 4 after bending and fixing the ears. FIG. 6 is a schematic cross-sectional view when the mold is opened in a conventional manufacturing method. FIG. 7 is a schematic cross-sectional view of the conventional mold when it is closed. FIG. 8 is an end view of the molded product molded with the mold shown in FIGS. 6 and 7 before the ear portions are fixed. FIG. 9 is an end view after the ear portions are similarly fixed. 22, 41... Decorative plate (composite resin molded product), 2
2,42...Base body, 22a...Edge, 23,43...
...Skin, 24, 44...Ear portion, 27...(Pushing recess) Pushing groove, 28...(Concave portion forming projection) Groove forming wall, B...Bending portion, S...Soft sheet.

Claims (1)

[Scope of Claims] 1. A soft sheet skin covering a synthetic resin base is integrated with the base at the same time as the base is molded, and then the ears of the skin are bent and fixed to the back side of the base. In the method for manufacturing a composite resin molded article, a recess-forming protrusion is provided on the back side of the base body to form a push-in recess along the edge of the skin at the same time as the base body is molded. A method for manufacturing a composite resin molded product, comprising: molding it integrally with the base; and pushing an edge end of the skin into the push-in recess.