JPH1071677A - Resin molded product having hair line pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture surely easily a resin molded product having a pattern equivallent to a conventional hair line work product made of a metallic product wherein a surface is seen as a metal surface on which, as it were, a great number of hairlike patterns are formed irrespective of the resin molded product. SOLUTION: A resin molded product is composed of a resin base material 3 wherein many long narrow one directionarily extending fine grooves 5... are formed on its surface, and a brilliant material containing film of a metallic film 4 or the like coated on that surface. Base material is injection molded by use of a molding die wherein many corresponding fine grooves are formed on a surface of the die. Then, by applying metallic coating or pearl mica coating or the like onto a surface of the molded resin base material, the resin molded product is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a technique for decorating the surface of a resin molded product, and more particularly to a novel resin molded product having a hairline pattern and a method for producing the same.

[0002]

2. Description of the Related Art The technique of forming a hair-like pattern on the surface of a metal such as aluminum or steel, that is, hairline processing, has been well known to those skilled in the art. And, the metal plate and the like on which the hairline processing has been performed are conventionally, for example, audio products,
It is used for metal parts for surface decoration such as home appliances. In addition, metal parts having such hairlines have conventionally been produced by a method in which sandpaper or a metal brush is rubbed against the surface of a metal part or the surface of its shaped material to form hair-like narrow grooves on the metal surface. ing.

[0003]

However, conventional hairline processed products are limited to metal products or parts made of aluminum, steel or the like, and the hairline surface is a metal surface on which a large number of hair-like patterns are formed. Was pointing to Products or parts made of synthetic resin, such as ABS, PV
Up to now, there has been no automotive resin component made of C, PP, or the like having a hairline surface or a surface close thereto.

Accordingly, the present invention is a resin molded product, but has a surface that looks like a metal surface on which a number of hair-like patterns are formed, and is comparable to a conventional hairline processed product made of a metal product. However, it is an object to provide a resin molded product having a hairline pattern.
Another object of the present invention is to provide a novel manufacturing method capable of reliably manufacturing a resin molded product having the above hairline pattern, which has never existed before. Other objects of the present invention will be understood from the description of the present specification and the drawings.

[0005]

Means for Solving the Problems The present inventor has conducted various studies to solve the above-mentioned problems. Rubbing a sandpaper to form a plurality of elongated micro-grooves extending in one direction on the surface of the mold; and using this mold, a resin molded product having the numerous micro-grooves formed on the surface by injection molding. Metallic or pearl paints used for automotive topcoats are coated with an appropriate thickness on the surface of the resin molded product made, and as if a metal with many hair-like patterns formed It has been found that a resin molded article having a surface that looks like a surface can be obtained, and thus the present invention has been completed.

[0006] More specifically, the present invention relates to a resin base material having a large number of thin and elongated grooves extending in one direction formed on the surface thereof, and a glitter-containing coating film (for example, metallic) coated on the surface of the resin base material. (A coating film or a pearl mica coating film) having a hairline pattern. In addition, the present invention provides injection molding of a base resin using a molding die having a large number of thin, elongated grooves extending in one direction formed on the surface of the mold, and then forming a glittering material on the surface of the molded resin substrate. The present invention also relates to a method for producing a resin molded article having the above hairline pattern by coating with a containing paint (for example, a metallic paint or a pearl paint). Further, in a more preferred embodiment of the present invention, a clear coating film can be added as the uppermost layer on the surface of the resin molded article. Therefore, the present invention also relates to a resin molded product having the above hairline pattern, wherein a clear coating film is further coated on the surface of the above-mentioned glittering material-containing coating film. In addition, the present invention also performs injection molding of a base resin using a mold in which a large number of thin and elongated grooves extending in one direction are formed on the mold surface, and then shines on the surface of the molded resin substrate. The present invention also relates to a method for producing a resin molded article having the above hairline pattern by coating a material-containing paint and further coating a clear paint thereon.

Hereinafter, the present invention will be described in more detail. The resin molded article of the present invention is a resin molded article comprising a resin base material and a brilliant-containing coating film coated on the surface thereof, and its shape, dimensions, and the like are not particularly limited. It is determined according to the properties and use of the molded article. The resin substrate is generally a substrate made of a thermoplastic or thermosetting resin, and its type and composition are not particularly limited, and are appropriately selected depending on the use of the molded article.
For example, for resin parts for automobiles, particularly for interior resin panels and interior resin parts, for example, a resin base made of ABS resin, polyvinyl chloride resin or polypropylene resin is used. The resin substrate is characterized in that a large number of elongated hair-like microgrooves extending in one direction are formed on the surface thereof. As the ultrafine groove, a groove having a depth of about 10 μm to about 100 μm is suitable and more preferable. The length of the ultrafine groove is determined arbitrarily and appropriately. Also,
The ultrafine groove may be a groove that is elongated and has a shape extending in one direction, and may be a straight groove that extends straight, or may be, for example, a groove that is curved in a wavy shape. The depths, lengths and shapes of the ultrafine grooves are all the same and may be uniform, and the depths, lengths and shapes may be different for individual grooves, and the grooves may be uneven. Is also good. Further, the glittering material-containing coating film is a coating film having a metallic luster made of a coating material containing the glittering material, and is coated on the surface of the resin base material so that the fine and narrow grooves extending in one direction are not completely hidden. Is done. The thickness of the glitter-containing coating is not generally limited, but the thinner the coating, the more preferable. The brilliant material may be any material that gives a metallic luster to the coating film by emitting a unique or metal-like shine in the coating film, and examples thereof include aluminum powder and titanized mica pigment. The type and composition of the glitter material-containing paint are not particularly limited. For example, a metallic paint used for the top coat of an automobile body, that is, one in which aluminum powder is mixed in a translucent enamel (for example, a thermosetting acrylic paint), or a pearl paint used similarly for the top coat, Those in which the titanized mica pigment is mixed in a translucent enamel are satisfactorily applied. In addition, the clear coating film is a colorless and transparent coating film made of a clear coating material (a coating material containing no pigment),
It is overlaid and coated on the above-mentioned glittering material-containing coating film. The thickness of the clear coating is generally not limited. Further, as the clear paint, for example, a clear paint used for the uppermost layer of a top coat of an automobile body can be more preferably applied.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A resin molded article having the above-mentioned hairline pattern can be reliably and easily manufactured by combining the technique of injection molding and the technique of coating with a brilliant material (top coating of an automobile body). it can. This injection molding is characterized in that a molding die having a large number of thin and elongated hair-like fine grooves extending in one direction is formed on the surface of the die. In forming such an ultra-fine groove on the surface of the mold, a hairline processing technique for a conventional metal product can be used. For example, a sandpaper or a metal brush is rubbed in one direction on a required surface of the mold. This makes it possible to easily form a hair-like ultrafine groove on the surface of the mold.
Injection molding itself can be done according to conventional molding processes. The injection molding conditions such as the injection pressure, the injection temperature, the shape of the cavity, and the structure of the sprue and nozzle are not particularly limited, and can be appropriately changed depending on the type and properties of the base resin. Subsequent metallic or pearl mica coating and subsequent clear coating must be performed according to a coating process such as electrostatic coating, air spray coating, or airless spray coating, such as that applied to the top coat of an automobile body. Can be.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment relates to a resin molded product used for automobile interior parts and a method for producing the same, but it goes without saying that the present invention is not limited to this.

As shown in FIG. 1, a resin molded product 1 of an embodiment
Is a flat interior component, the upper surface 2 of which is a surface having aluminum luster, and is formed with a pattern in which many hair-like streaks flow in one direction. Therefore, the surface of the resin molded product 1 looks like a surface of a metal component on which a conventional hairline processing has been performed on a metal product. Resin molding 1
As shown in FIG. 2 and particularly in the enlarged portion, the surface of the resin base material 3 is coated with a metallic coating film 4 as a brilliant material-containing coating film. The resin substrate 3 is made of, for example, ABS, PVC, PP, or the like, and has a large number of ultrafine grooves 5 extending in one direction in the surface thereof. The depth of the ultrafine groove 5 is 10 to 100 μm, and the length of the groove 5 is about 20 to 30 mm. Metallic coating 4
It is made of a thermosetting acrylic metallic paint (in which aluminum powder is mixed) used for the top coat of an automobile body, and has such a thickness that the above-mentioned ultrafine grooves 5 are not completely covered.

Next, a method for manufacturing the resin molded article 1 of the embodiment will be described. First, the injection molding of the synthetic resin of the base material 3 is performed according to a general injection molding process, for example, using an injection molding machine as shown in FIG. That is, in the molding process, an injection mold 7 having a cavity 6 corresponding to the resin molded article 1 is prepared. Then, the nozzle 10 is brought into contact with the sprue 11 of the mold 7, and the shear force of the screw 12 is applied. Then, the molten base resin is injected and injected into the cavity 6 from inside the nozzle 10 through the sprue 11 (in the figure, the arrow f indicates the flow direction of the base resin), and then the pin 13 is used.
, And a series of processes of taking out a formed product. In this injection molding, a mold 7 as shown in FIG. 4, that is, a mold in which a large number of extremely fine grooves 8 are formed on the surface of the mold so as to be elongated and extend in one direction is used. Done. Accordingly, the resin base material 3 having a large number of elongated microscopic grooves 5 extending in one direction is formed on the surface. Then, although not shown, a thermosetting acrylic metallic paint is applied according to a general process,
By spray-coating the surface of the molded resin base material 3 to such a thickness that the ultrafine grooves 5 are not completely hidden,
Metallic coating film 4 as a glitter material-containing coating film is applied to resin base material 3
To the surface.

The surface of the resin molded article 1 thus formed has a pattern with aluminum luster and a plurality of hair-like streaks flowing in one direction. Looks like a metal surface on which is formed, and thus has an excellent performance that is comparable to a conventional hairline processed product made of a metal product and is much lighter than a metal product. In addition, by coating the surface of the metallic coating film 4 with the clear paint, it is possible to finish the resin molded article having the clear coating film as the uppermost layer. This resin molded product is excellent in protecting the hairline pattern on the surface.

[0013]

As described above, the present invention provides an unprecedented new surface decoration technique (hairline decoration) for synthetic resin molded articles, particularly for injection molded articles. According to the present invention, a resin molded product having a hairline pattern, that is, a conventional hairline processed product made of a metal product, having a surface that looks like a metal surface having a number of hair-like patterns formed thereon, A comparable new resin molded product is provided. In addition, according to the production method of the present invention, there is an effect that the resin molded article having the above-mentioned hairline pattern can be reliably and easily produced according to the general technique of injection molding and coating of the glittering material-containing paint. can get.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a resin molded product having a hairline pattern according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a cross section of the resin molded product of the embodiment shown in FIG. 1 together with an enlarged cross-sectional view of a part thereof.

FIG. 3 is a cross-sectional view showing a main part (a molding die and its surroundings) of an injection molding machine used for manufacturing a resin molded product of an example.

FIG. 4 is a sectional view showing a surface portion of a molding die of the injection molding machine shown in FIG. 3 and an injection-molded base resin together with an enlarged sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection molded product 2 Hairline pattern surface 3 Resin base material 4 Metallic coating film 5 Micro-groove 6 Cavity 7 Mold 8 Micro-groove on mold surface

Continued on the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical display location B29C 45/37 B29C 45/37 B32B 27/20 B32B 27/20 Z B44C 1/18 B44C 1/18 // B29L 7:00

Claims (4)

[Claims] 1. A resin molded product having a hairline pattern, comprising a resin base material having a plurality of elongated finely extending grooves extending in one direction formed on a surface thereof, and a glittering material-containing coating film coated on the surface of the resin base material. . 2. The resin molded article according to claim 1, wherein a clear coating film is further coated on the surface of the coating material containing the glittering material. 3. Injection molding of a base resin is carried out by using a molding die having a large number of thin and elongated grooves extending in one direction, and then a glitter material is contained on the surface of the molded resin substrate. The method for producing a resin molded article having a hairline pattern according to claim 1 by coating with a paint. 4. Injection molding of a base resin is carried out using a molding die having a plurality of elongated finely extending grooves extending in one direction on the surface of the mold, and then a glitter material is contained on the surface of the molded resin substrate. 3. The method for producing a resin molded article having a hairline pattern according to claim 2, wherein the resin molded article is coated with a paint and further coated with a clear paint.