JPS631187B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of transfer foil stamping onto the chevron-shaped convex surface portion of an article having a long cross-section having a chevron-shaped convex shape.

2. Description of the Related Art A method of imparting a metallic color to the surface of an article manufactured from a synthetic resin using a metallizing technique and using it as a decoration or as a substitute for metal products has been widely adopted.

Metalizing techniques for the surface of synthetic resin articles include wet plating methods such as chemical plating; dry plating methods such as vacuum evaporation, sputtering, and ion plating; and other methods such as metal spraying, metallic paint application, and foil stamping. be. The wet plating method has a problem in that it is difficult to treat waste liquid, and the dry plating method does not have the problem of waste liquid treatment, but has the problem that the equipment is expensive and it is economically disadvantageous.

Although the foil stamping method is primitive, there is no problem with waste liquid, and it is used for car parts such as radiator grilles, rear panel garnishes, various parts marks; front frames of televisions, tape recorder housings, etc.
Partial metallization of relatively bulky large to medium sized articles such as picture frames, window frames, etc. has recently been reviewed due to its economic advantages.

Traditionally, foil stamping printing technology was developed in the 1950s.
Methods described in Japanese Patent Publication No. 7590, Japanese Patent Publication No. 36-20577, etc. are known, and these all relate to techniques for hot stamping printing on flat parts of articles. Regarding the technique of foil stamping printing on the concave curved surface of an article, a method described in Japanese Patent Publication No. 7843/1988 has been proposed, but with this method it is not possible to foil stamp the convex, chevron-shaped part of the article. be.

Under such circumstances, the present inventors have conducted extensive studies with the aim of providing an industrially advantageous method for foil stamping printing on the chevron-shaped convex surface portion of an article having a long chevron-shaped convex surface. When hot stamping printing is performed using a roll made of heat-resistant rubber having a groove with a similar cross-sectional shape and a specific hardness,
The inventors have found that the above object can be achieved and have completed the present invention.

However, the gist of the present invention is that when hot stamping printing is carried out on the chevron-shaped convex surface portion of an article whose long cross section is formed into a chevron-shaped convex shape, a stamping film is placed on the article to be foil-stamped, The stamping film has a hardness of 60 to 90 degrees as measured in accordance with JIS K-6301, with cut grooves similar to the chevron shape of the article, and sharp protrusions on both ends of the cut grooves. Hot stamping printing on the chevron-shaped convex surface of the article, characterized by pressing the stamping film into close contact with the article using a roll made of heat-resistant rubber in the range of It lies in the method.

Hereinafter, embodiments of the method of the present invention will be described in detail based on the drawings, but the present invention is not limited to the following examples unless it exceeds the gist thereof.

FIG. 1 is a longitudinal side view showing a stamping film placed between an article and a roll, and FIG. 2 is a longitudinal side view of another example of the roll used in the method of the present invention.

In the figure, 1 is a long article with a convex chevron-shaped cross section, 2 is a jig for supporting the article, 3 and 23 are rolls, and 4 and 24 are similar to the chevron shape of the article provided on the roll. 5 and 25 are protrusions at both ends of the notch, 6 is a heater for heating the roll, and 7 is a cut groove.
is a stamping film.

The article to be foil-stamped by the method of the present invention is long and has a convex chevron-shaped cross section.
In the figure, an article 1 having an inverted V-shaped cross-sectional shape is illustrated. The angle α formed by the chevron-shaped convex surface of article 1 is
90 degrees or more is preferable, and the range from 95 degrees to 140 degrees is
Particularly preferred. The article 1 may be made of thermoplastic synthetic resin, thermosetting synthetic resin, or the like. In addition, although the figure shows an example of a thin-walled article having an inverted V-shaped cross-sectional shape, it is of course not limited to the illustrated article. It is preferable that the article 1 is supported by the jig 2, since hot stamping printing can be carried out smoothly.

In the method of the present invention, a stamping film 7 is placed on the article.

Examples of stamping films include, but are not limited to, those in which a thin, easy-to-cut metal foil is attached to a thin plastic film via a mold release agent, and a heat-sensitive adhesive is further applied to the outer surface of the foil. Examples include rolled foil made of colored paper or plastic film, and foil prepared by metal vapor deposition. These stamping films may be made of one color or may be printed with multiple colors such as a wood grain pattern.

The stamping film 7 is pressed and brought into close contact with the article by a roll 3 made of heat-resistant rubber. This roll 3 has a cylindrical or short cylindrical outer shape, and a cut groove 4 having a similar shape to the chevron shape of the article is provided on its outer peripheral wall. The cut grooves 4, which are similar in shape to the chevron shape of this article, have the function of pressing the stamping film 7 along the chevron-shaped convex surface of the article 1 so as not to cause wrinkles, and adhering the foil surface to the article. It is something that will be fulfilled. Therefore, it is preferable that the angle α' of the kerf groove 4 be equal to the angle α formed by the chevron-shaped convex surface of the article 1, or that α' be several degrees larger than α.

Both ends 5, 5 of the cut groove 4 of this roll 3
Leave it as a sharp ridge. This protrusion serves to cut the foil surface of the stamping film when the stamping film 7 is pressure-adhered to an article. Therefore, it is better to make the protrusion as sharp as possible. The roll 23 shown in FIG. 2 shows that both ends 25, 25 of the cut groove 24 are sharpened.

In this way, the roll 3 or 23 presses the stamping film 7 into close contact with the article 1 and adheres the foil surface of the stamping film to the article 1, and
The protrusions function to cut the foil surface of the stamping film, but if they are too soft or too hard, they will not be able to perform these functions satisfactorily.
The preferred hardness of the material constituting the roll is JIS K
- The value measured in accordance with 6301 is in the range of 60 to 90 degrees.

Moreover, when the stamping film 7 is pressure-adhered to the article 1, the roll 3 or 23 needs to be heated in advance to a temperature at which the heat-sensitive adhesive of the stamping film exhibits adhesive strength. Therefore, the material of the roll is preferably made of heat-resistant rubber. Examples of the heat-resistant rubber include silicone rubber and fluorine rubber.

The figure only shows an example of foil stamping printing on one chevron-shaped convex surface with one roll, but it is possible to print with multiple rolls or with a long roll with multiple cuts on one roll. It can also be modified to use hot foil stamping.

In order to perform hot stamp printing on the chevron-shaped convex surface of an article having a convex chevron-shaped cross section by the method of the present invention, first, as shown in FIG. Place it under slight tension. Next, the stamping film 7 is pressed onto the article 1 by the roll 3, which has been previously heated to a desired temperature by the heater 6. The stamping film 7 is heated by the roll 3 to activate the heat-sensitive adhesive, and is first pressed onto the top of the chevron-shaped convexity of the article 1 . Stamping film 7
By pressing it against the article 1 with the roll 3, it is possible to make it adhere tightly without causing wrinkles. By further pressing the roll 3 against the article 1, the foil surface of the stamping film can be adhered to the article. Next, when the stamping film is peeled off, only the foil surface adheres to the chevron-shaped convex surface of the article 1 by means of the heat-sensitive adhesive previously applied to the stamping film.

Moreover, by forming sharp protrusions 5, 5 on both ends of the cut groove 4 of the roll 3, when foil stamping is performed with the roll 3, the foil surface of the stamping film is cut by the sharp protrusions 5, 5. The foil surface transferred to the chevron-shaped convex surface can form accurate and beautiful lines that match the sharp protrusions 5, 5.

The method of the present invention has the following effects and has extremely great industrial utility value.

(1) According to the method of the present invention, it is extremely easy to partially metalize relatively bulky large to medium sized articles.

(2) In the method of the present invention, since the stamping film is pressed using a roll made of heat-resistant rubber having a specific structure, it is possible to perform foil stamping without wrinkles on the chevron-shaped convex surface.

(3) In the method of the present invention, since the stamping film is pressed using a roll having a specific structure, the edges of the foil surface can be beautifully finished.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a stamping film placed between an article and a roll;
FIG. 2 is a longitudinal sectional side view of another example of the roll used in the method of the present invention. In the figure, 1 is an article, 2 is a jig, 3 and 23 are rolls, 4 and 24 are grooves provided in the rolls, 5 and 25 are protrusions at both ends of the grooves, 6 is a heater for heating the rolls, 7 indicates a stamping film.

Claims (1)

[Claims] 1. When hot-stamping the convex portion of a long article with a convex chevron cross section, a stamping film is placed on the article to be foil-stamped, and the stamping film is placed in a shape similar to the convex chevron of the article. The roll is made of heat-resistant rubber with a hardness in the range of 60 to 90 degrees measured in accordance with JIS K-6301, which has a shaped cut groove and sharp protrusions on both ends of the cut groove. A method for hot stamping printing on a chevron-shaped convex surface of an article, the method comprising: pressing the stamping film into close contact with the article, and cutting the foil surface of the stamping film using the protrusions.