JPS6029356B2 - Hot stamping method for molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for hot stamping a molded article, and particularly to a method for hot stamping a molded article with excellent aesthetic appearance.

Automotive grills, moldings, finishers,
BACKGROUND ART Hot stamping is performed on convex portions of characters, patterns, symbols, etc. formed on instrument panels and other synthetic resin molded products.

Figure 1 is a perspective view showing such a synthetic resin molded product, Figure 2 is a perspective view showing such a synthetic resin molded product;
The figure is a partial cross-sectional view. The molded product 1 is integrally molded so that a convex portion lb on which hot stamping is applied protrudes from a main body la by means of leg portions lc. As shown in Fig. 2, the convex part lb and the side part lc are connected by a radius ld,
If hot stamping is applied to the area indicated by a, a three-dimensional effect will appear and the decorativeness can be improved. FIG. 3 is a vertical sectional view showing a conventional hot stamping method, FIG. 4 is a partially enlarged view thereof, and FIG. 5 is a perspective view showing a molded product subjected to hot stamping.

In the drawing, 2 is a moving table, 3 is a transfer film, 4 is a delivery roller, 5 is a take-up roller, and 6 is a hot stamping roller, which are made of an elastic material such as silicone rubber.
In the conventional hot stamping method, a movable table 2 is used to apply hot stamping to the portion a, which includes a radius in a portion.
Place the molded product 1 on top and move the hot stamping roller 6 supported by a spring (not shown) from the position 6a to the position 6 in Figures 3 and 4, that is, the roller surface is slightly below the surface of the convex portion lb. By moving the moving stage 2, the hot stamping roller 6 comes into pressure contact with the radius ld and the convex part lb through the transfer film 3, and as shown in FIG. A transfer film layer 7 is formed on the surface.

6b shows the relative position of the hot stamping roller 6 with respect to the molded product 1 during hot stamping.

However, in such a conventional hot stamping method for molded products, the hot stamping roller 6
Since the hot stamping is carried out by lowering the surface to a position where it interferes with the surface of the convex portion lb and maintaining it supported by a spring, it is difficult to accurately control the mutual positional relationship, and as shown in Fig. 4. Since the radius LD is bitten into the hot stamping roller 6, the parting line 7a formed at the radius LD part becomes meandering as shown in FIG. 5 due to some unevenness in the shape of the molded product 1. There was a problem in that it damaged the

This invention was made by focusing on such conventional problems, and by hot stamping with the frame remounted on the base of the molded product so as to surround the convex part of the molded product, the problem of the upper part of the molded product can be solved. It aims to solve the problem.

This invention relates to a method of applying hot stamping by pressing an elastic body to a convex portion formed on the surface of a molded product, in which a frame that is the same height as the convex portion or slightly lower than the convex portion is placed so as to surround the convex portion. Place it on the molded product keeping a small distance from the convex part,
This hot stamping method for a molded product is characterized in that hot stamping is performed by pressing a part of the elastic body against a frame.

Hereinafter, this invention will be explained with reference to the drawings.

Figure 6 is a perspective view showing the frame placed on the molded product;
9 to 9 are vertical sectional views showing a hot stamping method according to an embodiment of the present invention, and the same reference numerals as in FIGS. 1 to 5 indicate the same or corresponding parts.
In the drawing, 8 is a removable frame manufactured separately from the molded product, and includes a core body 8a made of an aluminum plate, etc.
An elastic material layer 8b made of silicone rubber attached to the surface and a rubber plate 8c provided so as not to damage the surface of the molded product 1 are laminated, and the overall thickness of the frame 8 is the same as that of the molded product. The height is set to be equal to or slightly smaller than the height of the convex portion lb of No. 1, and surrounds the convex portion lb. The take-up roller 5 and the hot stamping roller 6 are connected by a chain or the like so as to move in conjunction with the moving table 2. The hot stamping method is
While fixing the molded product 1 to the movable table 2, a frame 8 is placed on the main body la so as to surround the convex part lb, keeping a slight distance from the convex part lb, and a hot stamping roller 6 is attached, the surface of which is a transfer film. 3 until it touches the surface of the frame 8, and then moves the movable stage 2 in the direction of the arrow, the hot stamping roller 6 is pressed against the radius lb as shown in FIG. As shown in FIG. 8, the transfer film layer 7 rises slightly so as to ride on the convex part 1b and rotates while being pressed against the convex part 1b.
As shown in FIG. 9, after covering the entire width of the convex portion lb and reaching the frame 8 at the end, the hot stamping roller 6 is raised and the frame 8 is removed from the molded product 1. , the hot stamping work is finished.

Line P in FIG. 7 shows the relative trajectory of the hot stamping roller 6 with respect to the molded product 1. By performing hot stamping as described above, the hot stamping roller 6 is limited in its lowering position by the frame 8, and is
and the frame 8 is bridged, and as shown in FIGS. 7 and 9, the cutting edge of the radius ld is reduced, making it easier to position the hot stamping roller 6 and preventing the parting line from meandering in the radius ld. can. Further, if an elastic material layer 8b made of silicone rubber is provided on the surface of the frame 8, no transfer film is formed on the frame 8, and the frame 8 can be used repeatedly. Although the frame 8 is shown as a flat plate in the above embodiment, it should be formed into a shape corresponding to the shape of the molded product 1. For example, if the main body la is curved, It is formed into a curved shape.

It goes without saying that the planar shape of the convex portion lb to be hot-stamped changes depending on the shape of the convex portion lb. Further, although the above description has been made regarding roller type hot stamping, the present invention can also be applied to other types of hot stamping such as press type. Further, the present invention is applicable not only to molded products for automobiles but also to hot stamping of other molded products. As explained above, according to the present invention, hot stamping is performed by arranging the frame close to the rounded part of the convex part of the molded product so as to surround the convex part, so that the surface of the convex part and Since the dimensional relationship of the frame surface can always be maintained constant, the hot stamping roller will not hit the rounded part too deeply or too shallowly, and therefore hot stamping can always be applied with a constant contact. As a result, meandering of the parting line between the start and end points of the transfer film layer formed by hot stamping is prevented, making it possible to perform hot stamping with excellent aesthetics.In addition, since hot stamping can be performed with a constant pressure, the adhesion of the transfer film is improved. It has the effect of being constant and stable.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a synthetic resin molded product, Fig. 2 is a partial cross-sectional view, Fig. 3 is a vertical cross-sectional view showing the hot stamping method of the substructure, Fig. 4 is a partially enlarged view, and Fig. 5 is a partially enlarged view. The figure is a perspective view showing a molded product subjected to hot stamping, FIG. 6 is a perspective view showing a frame placed on the molded product, and FIGS. 7 to 9 each show hot stamping according to an embodiment of the present invention. FIG. 3 is a vertical cross-sectional view illustrating the method. In each figure, the same reference numerals indicate the same or corresponding parts, 1 is a molded product, 2 is a moving table, 3 is a transfer film, 4 is a delivery roller, 5 is a winding roller, 6 is a hot stamping roller, 7
8 is a transfer film layer, and 8 is a frame. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. In a method of applying hot stamping by pressing an elastic body to a convex portion formed on the surface of a molded product, a material having a height that is the same as the height of the convex portion or slightly smaller than that of the convex portion is placed so as to surround the convex portion. a low frame,
A method for hot stamping a molded product, characterized in that the elastic body is placed on the molded product at a slight distance from the convex portion and hot stamped by pressing so that a part of the elastic body comes into contact with the frame. 2. The method for hot stamping a molded product according to claim 1, wherein another elastic material layer is formed on the surface of the frame. 3. The method of hot stamping a molded product according to claim 2, wherein the elastic material layer is made of a material on which no transfer film is formed. 4. A method for hot stamping a molded product according to any one of claims 1 to 3, wherein the molded product is fixed to a moving table and pressed by an elastic roller.