JPH07112716B2 - Method for repairing urethane foam moldings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed urethane molded article such as a covering layer of a steering wheel or a horn pad of a steering wheel, which is formed by foam molding with an uneven pattern formed on the surface. The present invention relates to a method for repairing a urethane foam molded article for repairing the hollow portion formed.

[0002]

2. Description of the Related Art Conventionally, in this type of urethane foam molded article, when a cavity is formed on the surface, the following two methods are known to repair the cavity (Japanese Patent Publication No. -1659).

First, the first method is a method of degreasing the hollow portion, injecting urethane putty into the hollow portion to cure the hollow portion, polishing the surface, and coating if necessary.

In the second method, after degreasing the cavity, a material obtained by removing the foaming agent from the composition of the urethane foam RIM molding material is injected into the cavity after degreasing and cured, and the surface is polished, It is painted and finished.

However, the first method has a drawback that the repaired portion is easily peeled off. On the other hand, in the second method, although it is difficult to peel off, the material for filling the cavity is a fast-reacting RIM molding material and is easily hardened, so that it is difficult to accurately fill a predetermined portion with a predetermined amount. , The workability was bad. For example, if it is filled with extra and hardened, it will be necessary to scrape off without scratching the surroundings, and it is very difficult to work.

Further, in the case of a molded article having an uneven pattern such as a texture pattern on the surface, when a cavity is formed on the surface, the first and second methods are easily cured, so that the repaired area is Since it is not possible to form uneven patterns such as grain on the surface, it was not possible to repair with good appearance even by using the first and second methods.

The present invention is intended to solve the above-mentioned problems, and even if the surface has an uneven pattern such as grain, it can be repaired without deteriorating the appearance, is hard to peel off, and has good workability. An object is to provide a method for repairing a urethane foam molded article.

[0008]

A repair method according to the present invention is a method for repairing a urethane foam molded article, wherein a concave-convex pattern is formed on the surface of the urethane foam and the cavity formed on the surface is repaired. Then, scrape the inner surface of the cavity,
A cutting step of adjusting the shape of the hollow portion, a filling step of melting and embedding a hot melt adhesive in the cut hollow portion, and a coating application step of applying a paint of the same color as the molded product to the filled hot melt adhesive. And a bonding step of heating and bonding the paint and the hot melt adhesive, and a transfer step of transferring an uneven pattern similar to the uneven pattern of the cavity peripheral edge of the molded article to the surface of the hot melt adhesive, It is characterized by repairing through.

[0009]

In the repairing method according to the present invention, since the material to be embedded in the cavity in the filling step is the hot melt adhesive, the cavity can be easily and accurately filled with a predetermined amount by melting. Therefore, workability is not reduced.

In this case, for example, in the case of extra filling, the extra hot melt adhesive can be easily removed by heating, so that the filling operation becomes easy.

Further, since the shape of the cavity is adjusted in advance in the cutting step so that the filling can be performed easily before the filling step, the filling operation is further facilitated.

Further, since the material to be filled in the cavity is a hot melt adhesive, it is hard to peel off after curing.

Further, in the repairing method according to the present invention, a paint of the same color as that of the molded product is applied to the surface in the paint applying process, and further, a cavity of the molded product is applied to the surface of the filled hot melt adhesive in the transferring process. Since the same uneven pattern as the uneven pattern on the peripheral edge of the part is transferred, it is easy to shape the surface of the repaired part with the same color as the surrounding appearance, and to easily shape the same pattern as the surrounding uneven pattern on the surface of the repaired part. The appearance of the repaired part can be improved.

Therefore, in the repairing method according to the present invention, even if the surface is provided with an uneven pattern such as wrinkles, it can be repaired without deteriorating the appearance, is less likely to come off, and has good workability. You can

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The repair method of the embodiment is as a urethane foam molded article, in which the coating layer 1 is formed on the outer peripheral surface of the ring portion of the steering wheel so that the coating layer 1 faces inward from the integral skin layer on the surface side. This is to repair the cavity 2 formed in the. On the surface of this coating layer 1,
An uneven pattern 1a such as a grain is formed.

The repair of the cavity 2 of the coating layer 1 formed by voids and the like will be described. As shown in FIG. 1, in the case of the embodiment, a cutting process, a filling process, a paint applying process, an adhering process, and a transferring process. It consists of five steps.

In the cutting step, the inner peripheral surface of the hollow portion 2 is cut by a cutter or the like to adjust the shape of the inner space of the hollow portion 2 into a hemispherical shape. The reason for this cutting is the coating layer 1 at the time of molding.
This is for removing the release agent used in (1) and degreasing, and for making the shape of the hot melt adhesive 3 easy to fill in a later step.

In the filling step, the hot-melt adhesive 3 of the same color as the coating layer 1 is heated and melted to be embedded in the cut cavity 2.

The hot-melt adhesive 3 may be a polyester resin, but from the viewpoint that the adhesive is less stringed, is not sensitive to temperature changes, and is cured slowly to some extent, it is easy to work. It is desirable to use a resin.

Further, in this filling step, when the cut cavity 2 is filled with the hot melt adhesive 3, the hot melt adhesive 3 is filled up to every corner of the cavity 2 without forming a gap. It is desirable to press from the surface side of the adhesive 3. At that time, if the transfer plate 4 used in the transfer step described later is used, it is not necessary to use an extra tool.

In the coating material applying step, the coating material 5 of the same color as the coating layer 1 is applied to the surface of the filled hot melt adhesive 3 by using a spray or the like to match the color of the peripheral coating layer 1.

The coating material 5 is, for example, a polyester resin-based coating material for in-mold coating so that the coating material 5 can be stretched following the elasticity of the coating layer 1 after curing.

In the bonding step, the portion filled with the hot melt adhesive 3 is partially heated to bond the paint 5 and the hot melt adhesive 3 together.

This heating is carried out at a temperature of 150 ° C. or lower using hot air such as a dryer or hot jet. This 15
The reason for heating at 0 ° or less is to prevent the hot melt adhesive from being thermally decomposed.

In the transfer step, the transfer plate 4 made of silicon or the like on which the uneven pattern such as grain is transferred in advance.
Is pressed against the hot melt adhesive 3 in a heated state, the uneven pattern 6 is transferred to the surface of the hot melt adhesive 3, and the hot melt adhesive 3 is cured, whereby the repair of the cavity 2 can be completed. The uneven pattern of the transfer plate 4 is configured so that a pattern 6 similar to the uneven pattern 1a of the molded product 4 can be formed.

In the repairing method which is performed through the cutting step, the filling step, the paint applying step, the adhering step, and the transferring step, since the material to be embedded in the cavity 2 in the filling step is the hot melt adhesive 3, it is not melted. In this case, the cavity 2 can be easily and accurately filled with a predetermined amount without lowering workability.

In this case, for example, in the case of extra filling, since the extra hot melt adhesive 3 can be easily removed by heating, the filling operation becomes easy.

Further, the shape of the cavity 2 is adjusted in advance in the cutting step so that the filling can be easily performed before the filling step, so that the filling operation is further facilitated.

Further, since the material to be filled in the cavity 2 is the hot melt adhesive 3, it is hard to peel off after being hardened.

Further, in the repairing method of the embodiment, in the paint applying step, the paint 5 of the same color as the coating layer 1 is applied to the surface thereof, and in the transfer step, the molded product is formed on the surface of the filled hot melt adhesive 3. Since the unevenness pattern 6 similar to the unevenness pattern 1a on the periphery of the cavity 2 of 1 is transferred, the surface of the repaired part has the same color as the surrounding appearance, and the surface of the repaired part has the same pattern 6 as the surrounding unevenness pattern. Can be easily shaped, the appearance of the repaired part can be improved, and the same effects as those described in the section of the above-mentioned action and effect of the invention can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram sequentially showing a repair process showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... (Molded article) coating layer, 1a ... uneven pattern, 2 ... cavity part, 3 ... hot melt adhesive, 4 ... transfer plate, 5 ... paint, 6 ... uneven pattern.

Claims (1)

[Claims] 1. A method for repairing a urethane foam molded article, which is formed by foam molding with a concavo-convex pattern formed on the surface and repairs a cavity formed on the surface, which comprises scraping the inner peripheral surface of the cavity. A cutting step of adjusting the shape of the hollow portion, a filling step of melting and embedding a hot melt adhesive in the cut hollow portion, and a coating application for applying the same color paint as the molded product to the filled hot melt adhesive A step, a bonding step of heating and bonding the paint and the hot melt adhesive, and a transfer step of transferring an uneven pattern similar to the uneven pattern of the peripheral edge of the cavity of the molded product to the surface of the hot melt adhesive; A method for repairing a urethane foam molded article, characterized in that the repair is carried out after.