JPH03248938A - Synthetic resin moulding and manufacture thereof - Google Patents

Abstract

PURPOSE:To perform firm coupling of a decorative material with a core by forming a recessed part in the core, and forcing a part of the decorative material to cut into the recessed part, in a moulding covered with the decorative material having the core formed of hard resin the surface of which is formed of soft resin. CONSTITUTION:A moulding comprises a core 1 formed of relatively hard synthetic resin and a relatively soft decorative material 2 covering the surface of the core 1. A T-shaped recessed part 11 is formed in one end of the core 1, and one end of the decorative material 2 is engaged with the recessed part A. circular recessed part 13 is formed in the other end of the core 1, and the other end of the decorative material 2 is engaged with the circular recessed part. Further, the other end described above is extended over a protrusion part 12 of the core 1 to cover an end part 22 of the decorative material 22. This method maintains the surface of the decorative surface 2 in a smooth state and firmly couples the decorative material 2 with the core 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synthetic resin molding used in automobiles, etc., and a method for manufacturing the same.

[Prior art]

BACKGROUND OF THE INVENTION Moldings are attached to the side surfaces of automobiles for decoration and protection.

Conventionally, as shown in FIG. 14, such a molding has a core material 91 made of a relatively hard synthetic resin and a relatively soft decorative material 92 coated on the front surface of the core material 91. The core material 91 and the design material 92 are bonded together with an adhesive.

However, in the molding 9, it is necessary to apply an adhesive to the surface of the core material 91 in advance, and then mold the design material 92 by insert molding or the like. Furthermore, in order to improve the adhesive effect of the adhesive, the surface of the core material 91 must be treated with a primer. Furthermore, there is a risk that the adhesive may deteriorate during use of the molding, causing the decorative material 92 to peel off.

Therefore, as shown in FIG. 15, a molding 90 has also been proposed in which the lower surfaces of both sides of the core material 91 are covered with both side portions 921, 921 of the decorative material 92.However, this molding 90
However, as a first measure, as shown in FIG.
In addition to insert molding the design material 92 on the front side of 1,
There is a method of protruding the back side of the decorative material 92 into the through hole 910. Thereby, the design material 92 is held by the core material 91 by the protrusion 924 formed by passing through the core material 91.

Further, the side end portion 925 of the decorative material 92 wraps around the side surface of the decorative material 91 and is held by the core material 91.

The molding shown in FIG. 17 also includes a holding portion 926 that connects the protruding portion 924 and the side end portion 925 shown in FIG. 16 above.
is formed, thereby holding the design material 92 on the core material 91. The molding is also molded by insert molding.

The moldings shown in FIGS. 16 and 17 are both excellent in that the design material 92 is strongly held by the core material 91.

[Problem to be solved]

However, in the molding shown in FIGS. 16 and 17, the surface of the decorative material 92 has a concave sink mark 94 in the portion facing the through hole 910 of the core material 91.

This groove 94 is generated when forming a molding insert. That is, in the portion of the first through hole 910, the material for the design material exists in a large thickness from the front surface to the back surface of the core material 91. Therefore.

When the design material is cooled and solidified during formation, the sink mark 94 is generated in this portion.

Since the bar 94 is formed as a nine-dish-shaped recess on the surface of the smooth design material, it deteriorates the appearance of the molding. As mentioned above, malls also place emphasis on decoration, so
Particular attention should be paid to the appearance.

In view of these conventional problems, the present invention provides a synthetic resin molding having a smooth surface of the decorative material and in which the decorative material is firmly held against the core material, and a method for manufacturing the same.

[Means for solving problems]

The present invention uses a relatively hard synthetic resin as a core material.

In a synthetic resin molding in which the front surface of the core material is covered with a relatively soft decorative material, the core material has a recess, and a portion of the design material is wedged into the recess. Located in a distinctive mall.

The most noteworthy feature of the present invention is that the core material is provided with a recess, and a portion of the design material is inserted into the recess.

Such recesses include narrow grooves, T-shaped grooves, triangular grooves, and L-shaped grooves.
There was a groove. There are also circular, angular, and triangular recesses (see FIGS. 7 to 13).

Furthermore, none of these recesses are through holes as in the prior art.

In addition, since the recess holds the decorative material by biting a part of the decorative material into it, it is shaped like a wedge toward the inside of the core material, such as the above-mentioned T-shape, triangular shape, or L-shape. (See Figures 7, 9, and 11).

Furthermore, one or more recesses are provided at appropriate locations for fixing the design material to the core material. Also.

A plurality of recesses having the various shapes described above may be arranged in appropriate combinations.

Further, as the relatively hard synthetic resin used for the core material, polyacecool resin is used. Examples include polypropylene AB3. In addition, relatively soft design materials include soft PVC,
Rubber modified polypropylene.

Examples include thermoplastic elastomers and rubber.

Furthermore, an adhesive may be interposed between the core material and the decorative material to further strengthen the bond between the two.

Next, as a manufacturing method for the above-mentioned molding, a core material made of a relatively hard synthetic resin and having a plurality of recesses formed at appropriate positions is used, the core material is placed in a mold, and then the mold A relatively soft design material is supplied into the cavity, the front surface of the core material is covered with the design material, and a portion of the design material is allowed to flow into the recess, and then the design material is cooled and solidified. There is a method for manufacturing a synthetic resin molding with characteristics.

In the above method, methods for coating and molding the design material on the front side of the core material include injection molding, extrusion insert molding, and the like. In the case of the latter extrusion insert molding method, a molding can be continuously manufactured by first molding a core material on an extrusion line and then feeding the core material into a design material extrusion insert mold.

[Action and effect]

In the present invention, in the recess provided in the core material.

The core material and the decorative material are joined together with a portion of the decorative material biting into the core material. Therefore, the two design materials are firmly held against the core material.

In addition, a portion of the decorative material digs into the recess of the core material, but unlike the prior art described above, it does not exist as a large thickness that penetrates the through hole of the core material.

Therefore, the surface of the design material does not produce any concave sink marks even in the portion facing the concave portion.

Further, in the above manufacturing method, a core material provided with a recess is placed in a mold, and a core material provided with a recess is placed in the cavity.

We supply design materials that have been softened by heating. As a result, the core material is coated with the decorative material and a portion of the decorative material is easily inserted into the recess. The part of the design material that has dug into the recess in this way is almost never removed.

Therefore, according to the present invention, it is possible to provide a synthetic resin molding having a smooth and beautiful designed surface and in which the designed material is firmly bonded to the core material, and a method for manufacturing the same.

〔Example〕

First example Regarding the synthetic resin molding according to the embodiment of the present invention.

This will be explained using FIGS. 1 to 5.

As shown in Fig. 1, the molding of this example is a synthetic resin molding made of a core material 1 made of a relatively hard synthetic resin and a relatively soft decorative material 2 coated on the front surface of the core material 1. It is. As shown on the left side of the figure, T of the above core material]
The left portion 21 of the decorative material 2 is fitted into the letter-shaped recess 11 in a biting state. Further, on the right side of the figure, the right part of the design material is wedged into the circular recesses 13 provided in the core material 1. Also on the right side.

The end portion 22 of the decorative material 2 is covered beyond the convex portion 12 of the core material 1.

Further, FIG. 2 shows that the bonding surfaces on both the left and right sides of the decorative material 2 and the core material 1 are bonded with an adhesive 29.

As shown in FIGS. 3 and 4, the core material 1 is composed of a wide flat portion 101, a narrow flat portion 103, and an arcuate portion 102 provided therebetween. Then, the flat portion 101
A large number of circular recesses 13 are scattered along its longitudinal direction. Also.

A linear convex portion 12 is provided parallel to the circular concave portion 13 .

On the other hand, the flat portion 103 side has a 1-character-shaped recess 11 in the form of a groove along its longitudinal direction.

Next, in manufacturing the synthetic resin molding, injection molding is performed using an injection mold 3, as shown in FIG.

The mold 3 includes an upper mold 31 and a lower mold 32. The upper mold 31 has a mold surface 331 for molding the surface of the design material, and the lower mold 32 has a mold surface 321 for setting the back surface of the core material 1. Furthermore, when the mold 31 and the lower mold 32 are combined, a cavity 33 for molding a design material is formed between the mold 31 and the lower mold 32. When molding the decorative material portion, the decorative material is injected into the cavity 33 through the injection passage 34 and cooled.

During the molding, the design material that has entered the cavity 33 is filled into the cavity and also penetrates into the circular recess 13 and T-shaped recess 11 of the core material 1. As a result, the synthetic resin molding shown in FIG. 1 above is obtained.

As described above, in one example of the molding, the decorative material 2 covers the surface and side surfaces of the core material 1, and the circular recess 13 of the core material 1. A portion of the decorative material 2 is in a state of being wedged into the T-shaped recess 11. Therefore, the design material 2 is firmly held against the core material 1.

In addition, a part of the decorative material 2 bites into the circular recess 13 and T-shaped recess 11 of the core material 1, but the decorative material in these parts is similar to that shown in FIGS. 16 and 17 of the prior art. As shown, it does not exist as a large thickness that penetrates the through hole.

Therefore, the surface of the design trA2 does not have a concave sink mark even in the portion facing the concave portion.

Therefore, the molding obtained in this example has a smooth and beautiful designed surface, and the designed material 2 is firmly bonded to the core material 1.

Second Embodiment In this embodiment, as shown in FIG. 6, the molding shown in the first embodiment is molded by an extrusion insert molding method.

In this example, a cap 45 as a mold.

It consists of an extruder 40 for injecting a design material into the mouthpiece 45. Further, the two caps 45 have an extrusion molding port 451 as a molding cavity. The extrusion molding port 451 has the cross-sectional shape of a molding, that is, the cross-sectional shape of the core material 1 and the decorative material 2 covering the surface thereof. The core material 1 is similar to that shown in FIGS. 3 and 4 of the first embodiment.

In molding, the extrusion molding port 45
While supplying the core material l into the nozzle 4 from the extruder 40
1, the design material 2 is injected into the mouthpiece 45. As a result, the surface of the core material 1 is coated with the design material 2, and a portion of the design material 2 enters into the circular recess 13° T-shaped recess 11 of the core material 1.

Then, a synthetic resin molding similar to that shown in FIG. 1 is continuously obtained.

In this example as well, the same effects as in the first example can be obtained.

Third Embodiment This example shows various aspects of the recess provided in the core material 1, as shown in FIGS. 7 to 13.

FIG. 17 shows a T-shaped recess 11, and FIG. 18 shows a circular recess 13. These are similar to those shown in the first embodiment.

Further, FIG. 9 shows triangular recesses 14 expanding inwardly of the core material 1, and FIG. 10 shows rectangular recesses 15 dotted at the side edges of the core material 1. It was established as follows.

Further, FIG. 11 shows an L-shaped recess 16 formed in an L-shape toward the inside of the core material 1. As shown in FIG.

FIG. 12 shows two rows of groove-shaped triangular recesses 14 that expand inward. Figure 13 is.

This is a combination of the triangular recesses 14 shown in FIG. 9 and the groove-shaped square recesses 15 provided at the side edges of the core material.

In addition, each of the above-mentioned T-shaped, triangular, L-shaped, square, etc.-shaped recesses should be provided in the form of a groove along the longitudinal direction of the core material 1 (see 1-shaped recess 11 in Fig. 3). ).

Or provide them in a scattered manner (circular recesses 13 in Figure 3).
You can also do it.

In addition, in each of the above-mentioned figures, the code|symbol 2 is a design material.

[Brief explanation of drawings]

Figures 1 to 5 show the first embodiment, Figure 1 is a perspective view of the molding showing the recessed part, Figure 2 is a perspective view of the molding showing the adhesive placement part, and Figure 3 is the core material. FIG. 4 is a perspective view of the front side of the core material. FIG. 5 is a sectional view of the mold, FIG. 6 is a perspective view of the mold of the second embodiment, FIGS. 7 to 13 are explanatory diagrams showing various aspects of the recesses provided in the core material, Figures 14 to 17 show conventional examples, Figures 14 and 15 are perspective views of two types of conventional moldings, and Figures 16 and 17 show two types of aspects of the joint between the core material and the molding. 11°13°2°29°3°40° Core material. Single-shaped recess. Circular recess. Design material. Adhesive. Molding mold. Extruder. Applicant Tokai implantation

Claims (2)

[Claims] (1) In a synthetic resin molding in which a relatively hard synthetic resin is used as a core material and the front side of the core material is covered with a relatively soft design material, the core material has a recess, and the core material has a recess within the recess. A molding characterized in that a part of the above-mentioned design material is bitten into the molding material. (2) Using a core material made of relatively hard synthetic resin and having a plurality of recesses formed at appropriate positions, the core material is placed in a mold, and then a relatively soft material is placed in the cavity of the mold. A synthetic resin molding comprising: supplying a design material, covering the front side of the core material with the design material, flowing a part of the design material into the recess, and then cooling and solidifying the design material. Production method.