JPH04298352A - Method for printing molded product having protruding part - Google Patents

Abstract

PURPOSE:To finely arrange only the upper surface of the protruding part of a molded product to a predetermined hue, to improve finish accuracy even at a fine part and to reduce the number of working processes in the printing of the molded product having the protruding part. CONSTITUTION:The outer peripheral part of the printing surface 9 of a screen 8 in a screen printing method is formed so as to become wider than the outer peripheral part of the protruding part 5 of a molding 1 as a molded product and the printing surface 9 is arranged on the protruding part 5 of the molding 1. Next, a squeegee 12 is moved while the printing ink 10 on the screen 8 is pressed by the squeegee 12 to print the upper surface of the protruding part 5 of the molding 1 with the ink.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of printing a molded article having a convex part such as a molding which is attached to both sides or the rear of an automobile and has a convex part for characters or symbols.

0002

2. Description of the Related Art Conventionally, convex portions representing characters and symbols on resin molded products have been colored by painting in the following manner. That is, as shown in FIG. 7, a silver paint containing aluminum is spray-painted on the main body 23 of the resin molded article 21 to form a coating layer 24. Next, as shown in FIG. 8, an electroforming mask 25 as a masking material is placed on the surface of the convex portion 22 of this resin molded product 21 so as to cover it.

[0003] This electroformed mask 25 is made of metal such as copper by electrodeposition to match the shape of the resin molded product 21 having the convex portions 22. In this state, a white paint is sprayed to form a coating layer 26. By removing the electroforming mask 25, the outer periphery of the convex portion 22 is formed into a silver color, as shown in FIG. However, with this coating method, even the side surfaces of the convex portions 22 of the resin molded product 21 are formed in silver, and it is not possible to paint only the upper surfaces of the convex portions 22 in silver. Therefore, as shown in FIG. 10, a method may be considered in which a masking material 25 is adhered only to the upper surface of the convex portion 22, and white paint is spray-painted in this state.

0004

[Problems to be Solved by the Invention] However, if paint is sprayed with the masking material 25 adhered only to the upper surface of the convex portion 22, the silver coating layer 24 on the convex portion 22 and the masking material 25 White paint enters through the gap between the ends of the Therefore, when the masking material 25 is removed after painting, as shown in FIG. 11, a white coating layer 26 is formed on both ends of the convex portion 22, which impairs the appearance.

[0005] Furthermore, the shape of the convex portion 22 may be complicated, or
There was a problem in that the finishing accuracy was poor even in small parts. Furthermore, the masking material 25 must be attached to the upper surface of the convex portion 22 of each molded product, which requires a separate work process. In the screen printing method, the substrate to be printed is generally flat and is not used for molded products having convex portions.

The present invention has been made to solve the above-mentioned problems, and its purpose is to be able to neatly arrange only the upper surface of the convex part to a predetermined color tone, to achieve high finishing accuracy even in small areas, and to be easy to work with. An object of the present invention is to provide a method of printing a molded product having a convex portion, which can reduce the number of man-hours.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a printing method for printing the upper surface of a convex part of a molded article having a convex part by a screen printing method, the outer periphery of the printing surface of the screen is formed wider than the outer periphery of the convex part of the molded product, and the printed surface is placed on the convex part of the molded product, and then printed on the top surface of the convex part of the molded product by pressing the printing ink on the screen with a squeegee. The gist of this paper is a method of printing a molded product having a convex portion.

[0008]

[Operation] The outer periphery of the printing surface of the screen is formed in advance to be wider than the outer periphery of the convex portion of the molded product, and the screen carrying the printing ink is placed on the convex portion of the molded product. Then, by moving the printing ink on the screen with a squeegee and moving it over the convex portion of the molded product, printing having a predetermined tone is performed on the entire upper surface of the convex portion.

[0009]

[Embodiments] Examples embodying the present invention will be described below with reference to FIGS. 1 to 6. As shown in FIG. 4, the molding 1 as a molded product in this embodiment is attached to the vehicle body 4 located below the stop lamp 2 attached to the rear of the automobile, and is located on the rearward extension line of the side molding 3. be. This molding 1 has a convex portion 5 representing the letters "TG".
is installed protrudingly. This mall 1 is made of polypropylene (
(hereinafter referred to as PP) by injection molding method,
It has a certain degree of flexibility.

As shown in FIG. 1, a white coating layer 6 is formed on the surface of the molding 1 using an acrylic paint. On the other hand, above the molding 1, a screen 8 for screen printing supported by a plate frame 7 is arranged. The screen 8 may be made of woven fabric such as nylon fiber or silk, or made of wire mesh or a thin perforated metal plate.

FIG. 2 is an enlarged sectional view of the main part of FIG.
2 is a plan view showing a state in which a screen 8 is placed on the molding 1. FIG. As shown in both figures, the printing surface 9 of the screen 8, that is, the part where a number of printing holes 11 are made to drop the printing ink 10 on the screen 8 downward, is marked with the letters "TG" of the molding 1. It extends along the convex portion 5 forming the. The outer periphery of this printing surface 9 is wider than the outer periphery of the convex portion 5 of the molding 1 by a length d. This length d is 0.1 to 0.2 m regardless of the width of the protrusion 5 in order to print the entire upper surface of the protrusion 5 of the molding 1 neatly.
m is appropriate.

If this length d is too small, there may be a portion on the upper surface of the convex portion 5 where the printing ink 10 is not printed.
If it is too large, the printing ink 10 printed on the upper surface of the convex portion 5 may drip to the side surface of the convex portion 5, which is not preferable. Figure 1
As shown in FIG.
A squeegee 12 is arranged for printing printing ink 10 on the upper surface of the convex portion 5 by pressing .

[0013] Next, the mold 1 was made by screen printing method.
A method of printing the printing ink 10 on the upper surface of the convex portion 5 will be explained. First, as shown in FIG. 1, printing ink 10 is placed on the screen 8, and the plate frame 7 is lowered to be placed near the upper surface of the convex portion 5 of the molding 1. This printing ink 10
is an acrylic resin containing aluminum as a pigment, and is an ink that can be printed in silver color.

Next, as shown in FIG.
The printing ink 10 is pushed slidingly on the screen 8 from left to right in the figure. Then, the printing ink 10 on the screen 8 passes through the printing holes 11 in the printing surface 9 of the screen 8 and adheres to the upper surface of the convex portion 5 of the molding 1, thereby forming a coating layer 13. Then, as shown in FIG. 6, after printing is completed, the entire upper surface of the convex portion 5 is printed in silver.

As described above, in this embodiment, since the outer periphery of the printing surface 9 of the screen 8 is made wider than the outer periphery of the protrusion 5 of the molding 1, a part of the protrusion 5 may not be printed. Also, since the length d is small, the convex portion 5
Only the upper surface of the convex part 5 can be printed neatly without the printing ink 10 dripping to the side surface of the convex part 5. Therefore, even if the convex portions 5 are small, the finish is fine and the printing accuracy is excellent. Moreover, unlike conventional painting, there is no need to use a masking material, so the number of work steps can be reduced accordingly.

The present invention is not limited to the above embodiments, but may be embodied as follows. (1) The printing ink 10 can be selected as appropriate depending on the type and purpose of the molded product, and may be an ink with modified pigments, for example. (2) Examples of molded products having convex portions include back panels, marks, emblems, etc. as automobile parts.

[0017]

According to the present invention, only the upper surface of the convex portion can be neatly arranged in a predetermined color tone, and even fine parts can be finished with excellent precision, and the number of work steps can be reduced.

[Brief explanation of drawings]

FIG. 1 is a diagram representing an embodiment of the present invention, and is a sectional view showing a state in which a screen is placed above a convex portion of a molding.

FIG. 2 is an enlarged sectional view of the main part of FIG. 1;

FIG. 3 is a plan view showing a state in which the screen is placed above the convex portion of the molding.

FIG. 4 is a perspective view showing the rear part of the automobile.

FIG. 5 is a cross-sectional view showing a state in which printing is performed on the upper surface of the convex portion of the molding.

FIG. 6 is a cross-sectional view showing a state in which printing of the upper surface of the convex portion of the molding is completed.

FIG. 7 is a diagram representing a conventional example, and is a cross-sectional view showing a state in which a coating layer is formed on the entire surface including convex portions.

8 is a cross-sectional view showing a state in which a masking material is placed on the convex portion in the state shown in FIG. 7; FIG.

9 is a sectional view showing a state in which another paint is applied from the state shown in FIG. 8 to form a coating layer.

FIG. 10 is a diagram illustrating another conventional example, and is a sectional view showing a state in which a masking material is attached only to the upper surface of a convex portion of a molded product.

FIG. 11 is a sectional view showing a state in which another paint is applied and a masking material is removed from the state in FIG. 10;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Molding as a molded article, 5... Convex part, 8... Screen, 9... Printing surface, 10... Printing ink, 12... Squeegee.

Claims (1)

[Claims] 1. A printing method in which the upper surface of a convex part (5) of a molded article (1) having a convex part (5) is printed by screen printing, the outer periphery of the printing surface (9) of a screen (8) is formed to be wider than the outer periphery of the convex part (5) of the molded product (1), and the printed surface (9) is placed on the convex part (5) of the molded product (1), and then the squeegee (12) is used to By pressing the printing ink (10) on the screen (8), the molded article (1
) A method for printing a molded product having a convex portion, the method comprising printing on the upper surface of the convex portion (5).