JPH05301241A - Resin molded product - Google Patents

Abstract

PURPOSE:To inexpensively and simply obtain a resin molded product whose surface touch and appearance are enhanced by piles by strongly attaching piles to the surface of a molded product main body to make them hard to fall out. CONSTITUTION:A resin molded product A obtained by molding a thermoplastic resin material into a predetermined shape under heating and pressure by press molding is constituted of a molded product main body made of a thermoplastic resin containing long glass fibers 3 and a large number of resin piles 7 applied to the surface of the molded main body 5. The implanting parts 7a of the piles 7 are melted by the heat at the time of press molding to be integrally welded to the molded main body 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in resin molded products, and more particularly to press molded products containing long glass fibers.

[0002]

2. Description of the Related Art Conventionally, as a resin molded article, for example, as disclosed in Japanese Patent Laid-Open No. 64-71714,
There is known a press-molded product in which a resin molding material is sandwiched between an upper mold and a lower mold and press-molded into a predetermined shape by heating and pressing.

[0003]

By the way, there is a resin molded product containing long glass fibers for the purpose of reducing the weight and increasing the strength. When the resin molded product contains long glass fibers as described above, the long glass fibers are exposed on the surface to cause surface roughness, resulting in poor surface properties.

Therefore, short fibers are planted by electrostatic flocking on the surface of a molded article body to which an adhesive has been applied, so as to cover up the surface roughness due to the exposure of long glass fibers, and the short fibers that are flocked on the surface make the surface feel. And it is thought to improve the appearance.

However, although the short fibers are fixed to the surface of the molded article body by an adhesive, they are indirectly fixed by the adhesive, and therefore, they have a drawback that they are easily removed. Further, if the short fibers can be firmly fixed to the surface of the molded article body without using an adhesive, the cost can be reduced accordingly, and the work of applying the adhesive can be eliminated, which is preferable from the viewpoint of workability.

The present invention has been made in view of the above points, and an object of the present invention is to weld a resin pile on the surface of a molded article body made of a thermoplastic resin containing long glass fibers. It is to firmly attach the pile to the surface of the molded product to make it hard to come off, eliminate the adhesive application process, and to obtain a resin molded product whose surface feel and appearance are improved by the pile at low cost and easily. .

[0007]

Means for Solving the Problems In order to achieve the above object, the means for solving the problems of the present invention is to provide a resin molded product obtained by press-molding a thermoplastic resin material into a predetermined shape by heating and pressurizing glass long fibers. A molded article body made of a thermoplastic resin containing
It is composed of a large number of resin piles having hairs implanted on the surface of the molded article body. Further, the planting portion of each pile is melted by heat during press molding and integrally welded to the molded product body.

[0008]

With the above-described structure, in the present invention, a large number of resin piles are planted on the surface of the main body of the thermoplastic resin molded product containing long glass fibers, and the planted portion of each pile is heated by press molding. Since it is melted and welded integrally to the molded product body, the piled part of each pile and the molded product body are integrated and the pile is firmly attached to the surface of the molded product body compared to the case where it is fixed with an adhesive. It is hard to get out of it. Further, since no adhesive is used, the cost is reduced by that amount and the work of applying the adhesive is unnecessary.
Therefore, it is possible to easily and inexpensively obtain a resin molded product whose surface feel and appearance are improved by the pile.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a resin molded product A according to an embodiment of the present invention. The resin molded product A is a thermoplastic resin material 1 laminated in a mat shape and preheated (shown in FIG. 4).
Is pressed into a box shape by pressing. More specifically, it is composed of a molded article body 5 made of a thermoplastic resin containing long glass fibers 3, 3, ... And a large number of resin piles 7, 7, ... Implanted on the inner surface of the molded article body 5. As shown in enlarged detail in FIG. 2, the planting portion 7a of each pile 7 is melted by heat during press molding and is integrally welded to the molded product body 5. Polypropylene or the like is used as the resin constituting the molded article body 5 and each pile 7, and the pile 7 preferably has a diameter of 2 to 3 denier and a length of 1 to 3 mm, but is not limited thereto. .

Next, the resin molded product A constructed as described above.
The molding procedure will be described with reference to FIGS. 3 to 5.

First, as shown in FIG. 3, with the upper die 9 of the press die 8 raised above the lower die 11, the outer periphery of the molding convex portion 15 including the positioning pins 13 of the lower die 11 is masked. After masking with the material 17, a large number of piles 7, 7, ... Are sprayed from the pile sprayer 19 onto the molding convex portion 15.

Next, as shown in FIG. 4, the masking material 17 is removed from the lower mold 11, the static electricity generator 21 is operated, and the polypropylene is laminated in a mat shape containing the long glass fibers 3, 3 ,. The thermoplastic resin material 1 (preheated to 180 to 190 ° C.) is placed on the molding convex portion 15 of the lower mold 11. As a result, static electricity is applied to the piles 7, and the piles 7 are charged and adhere to the molding convex portions 15 of the lower mold 11 in an upright state by the electrostatic attraction force.

After that, as shown in FIG.
With the upper mold 9 heated and held at 0 to 40 ° C. and 50 to 80 ° C., respectively, the upper mold 9 is lowered and a predetermined pressure is applied to the thermoplastic resin material 1 to fix the thermoplastic resin material 1. Press-molded into a predetermined shape by heating and pressing. At this time, the upper mold 9
The positioning pins 13, 13 into the positioning holes 23, 23 of
Is inserted so that the upper die 9 is not displaced from the lower die 11. As a result, the thermoplastic resin material 1 is sandwiched between the molding convex portion 15 of the lower mold 11 and the molding concave portion 25 of the upper mold 9 to melt and flow, fill the cavity, and then solidify, as shown in FIG. A large number of piles 7, 7,
Is the resin molded product A in which the flock is planted.

At this time, since the planting portion 7a of each pile 7 is melted by the heat of the thermoplastic resin material 1 at the time of press molding and integrally welded to the molded article main body 5, the planting portion 7a of each pile 7 is molded. The product body 5 can be integrated. Therefore, the pile 7 can be firmly attached to the surface of the molded article main body 5 as compared with the case where the pile 7 is fixed with an adhesive, and the pile 7 can be prevented from coming off easily. Further, since no adhesive is used, the cost can be reduced by that amount, and the application work of the adhesive can be eliminated, and the resin molded product A whose surface feel and appearance are improved by the pile 7 can be manufactured inexpensively and easily. Obtainable.

Further, the piles 7 standing up by the electrostatic attraction force tend to separate from the lower mold 11 by the action of the flow pressure of the thermoplastic resin material 1 which melts and flows. Since the mold temperature of 11 is set to be lower than the mold temperature of the upper mold 9, the thermoplastic resin material 1 is cooled and solidified on the lower mold 11 side faster than the upper mold 9 side and solidified. 7 is planted so as not to separate from the solidified thermoplastic resin material 1 portion. Therefore, even if the flow pressure of the thermoplastic resin material 1 portion which is still in a fluid state acts on each pile 7, each pile 7 does not separate, and is pushed by the melt-flowing thermoplastic resin material 1 portion to the outward direction. It just leans.

[0017]

As described above, according to the present invention,
A large number of resin piles are planted on the surface of a thermoplastic resin press-molded product body containing long glass fibers, and the planted portion of each pile is melted by the heat during press molding and integrally welded to the molded product body. Therefore, the planting portion of each pile can be integrated with the molded article body, and the pile can be firmly attached to the surface of the molded article body to make it difficult to pull out. Further, the cost can be reduced only by not using the adhesive, and the work of applying the adhesive can be eliminated, so that a resin molded product having a good surface property can be obtained at low cost and easily.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a resin molded product.

FIG. 2 is an enlarged vertical cross-sectional view showing a flocked portion of a resin molded product.

FIG. 3 is a forming process diagram showing a pile spraying state.

FIG. 4 is a molding process diagram showing a static electricity applied state and a state in which a thermoplastic resin material is placed on a press die.

FIG. 5 is a molding process diagram showing a pressed state.

[Explanation of symbols]

 1 Thermoplastic resin material 3 Glass long fiber 5 Main body of molded product 7 Pile 7a Planting part A Resin molded product

Claims (1)

[Claims] 1. A resin molded product obtained by press-molding a thermoplastic resin material into a predetermined shape by heating and pressing, the molded product main body being made of a thermoplastic resin containing long glass fibers, and the molded product main body of the molded product main body. A resin molded product, comprising a large number of resin piles having hairs flocked on the surface thereof, and the planting portion of each pile is melted by heat during press molding and integrally welded to the molded product body.