JP2924245B2 - Printing method of molded article having convex part - Google Patents

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 portion such as a molding which is mounted on both sides and a rear portion of an automobile and has convex portions of characters and symbols.

[0002]

2. Description of the Related Art Conventionally, convex portions representing characters and symbols of a resin molded product are colored by painting as follows. That is, as shown in FIG. 7, a silver paint containing aluminum is sprayed onto the main body 23 of the resin molded product 21 to form a coating layer 24. Next, as shown in FIG. 8, an electroforming mask 25 as a masking material is put on the surface of the convex portion 22 of the resin molded product 21 so as to cover the same.

The electroformed mask 25 is made of a metal such as copper, and is produced by electrodeposition according to the shape of the resin molded product 21 having the convex portions 22. In this state, a white paint is spray-coated to form a coating film layer 26. 9 by removing the electroformed mask 25.
As shown in FIG. 7, the outer peripheral portion of the convex portion 22 is formed in silver.
However, according to this coating method, silver is formed up to the side surface of the convex portion 22 of the resin molded product 21, and only the upper surface of the convex portion 22 cannot be painted in silver. Therefore, as shown in FIG. 10, a method is considered in which the masking material 25 is adhered only to the upper surface of the convex portion 22, and a white paint is spray-painted in this state.

[0004]

However, when the paint is sprayed and applied while the masking material 25 is 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 are formed. White paint enters through the gap between the two ends of the paint. Therefore, if the masking material 25 is removed after the coating, as shown in FIG. 11, a white coating layer 26 is formed on both ends on the convex portion 22, and there is a problem that the appearance is impaired.

In addition, the shape of the convex portion 22 is complicated,
There is a problem that the finishing accuracy is poor even in a fine portion. Further, a masking material 25 must be adhered to the upper surface of the convex portion 22 for each molded product, which requires a work process. In the screen printing method, a printing material is generally planar, and is not used for a molded product having a convex portion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to clean only the upper surface of a convex portion to a predetermined color tone, to achieve a high finishing accuracy even in a small portion, and to improve the workability. It is an object of the present invention to provide a method for printing a molded article having a convex portion that can reduce the number of steps.

[0007]

According to the present invention, there is provided a printing method for printing the upper surface of a convex portion of a molded article having a convex portion by a screen printing method, wherein the outer peripheral portion of the printing surface of the screen is provided. Is formed wider than the outer periphery of the convex part of the molded article, and after the printing surface is arranged on the convex part of the molded article, printing is performed on the upper surface of the convex part of the molded article by pressing the printing ink on the screen with a squeegee. The gist of the present invention is a method for printing a molded article having a convex portion.

[0008]

The outer peripheral portion of the printing surface of the screen is formed to be wider than the outer peripheral portion of the convex portion of the molded product in advance, and the screen on which the printing ink is placed is arranged on the convex portion of the molded product. Then, printing is performed by moving over the convex portion of the molded product while pressing the printing ink on the screen with the squeegee and printing, so that the entire upper surface of the convex portion has a predetermined color tone.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to FIGS. As shown in FIG. 4, the molding 1 as a molded product in the present embodiment is attached to a vehicle body 4 located below a stop lamp 2 attached to a rear portion of an automobile, and extends on an extension line of a rear of the side molding 3. is there. This mall 1 has a protrusion 5 representing a character “TG”.
Is protruding. The molding 1 is formed by injection molding using polypropylene (hereinafter referred to as PP) and has a certain flexibility.

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

FIG. 2 is an enlarged sectional view of a main part of FIG.
FIG. 2 is a plan view showing a state where a screen 8 is arranged on the mall 1. As shown in both figures, the printing surface 9 of the screen 8, that is, the portion where a large number of printing holes 11 are formed in order to drop the printing ink 10 on the screen 8 downward, is the character “TG” of the molding 1. Extending along the convex portion 5 which forms The outer peripheral portion of the printing surface 9 is formed wider than the outer peripheral portion of the convex portion 5 of the molding 1 by a length d. The length d is preferably 0.1 to 0.2 mm regardless of the width of the convex portion 5 in order to print the entire upper surface of the convex portion 5 of the molding 1 neatly.

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

Next, the molding 1 is formed by a screen printing method.
A method of printing the printing ink 10 on the upper surface of the convex portion 5 will be described. First, as shown in FIG. 1, the 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.

Next, as shown in FIG.
Pushes the printing ink 10 from left to right in the figure so as to slide on the screen 8. Then, the printing ink 10 on the screen 8 passes through the printing holes 11 on the printing surface 9 of the screen 8 and adheres to the upper surface of the convex portion 5 of the molding 1 to form the coating layer 13. Then, as shown in FIG. 6, after the 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 peripheral portion of the printing surface 9 of the screen 8 is wider than the outer peripheral portion of the convex portion 5 of the molding 1, a part of the convex portion 5 is not printed. And because the length d is small,
It is possible to print only the upper surface of the convex portion 5 neatly without the printing ink 10 dripping on the side surface of. Therefore, the finish is fine even in the portion where the convex portion 5 is fine, and the printing accuracy is excellent. Moreover, since it is not necessary to use a masking material as in the case of the conventional coating, the number of work steps can be reduced accordingly.

The present invention is not limited to the above embodiment, but may be embodied as follows. (1) The printing ink 10 can be appropriately selected according to the type and purpose of a molded product, and may be, for example, an ink in which a pigment or the like is changed. (2) Examples of the molded product having a convex portion include a back panel, a mark, and an emblem as an automobile part.

[0017]

According to the present invention, only the upper surface of the convex portion can be neatly adjusted to a predetermined color tone, and the fine portion can have excellent finishing accuracy and the number of working steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention, and is a cross-sectional view illustrating a state where a screen is arranged above a convex portion of a molding.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a plan view showing a state where a screen is arranged above a convex portion of the molding.

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

FIG. 5 is a cross-sectional view showing a state where 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 on the upper surface of the convex portion of the molding has been completed.

FIG. 7 is a cross-sectional view illustrating a conventional example, in which a coating layer is formed on the entire surface including a convex portion.

FIG. 8 is a cross-sectional view showing a state in which a masking material is put on the protrusion in the state of FIG. 7;

FIG. 9 is a cross-sectional view showing a state where another paint is applied from the state of FIG. 8 to form a coating layer.

FIG. 10 is a view showing another conventional example, and is a cross-sectional view showing a state in which a masking material is stuck only on the upper surface of a convex portion of a molded product.

11 is a cross-sectional view showing a state where another paint is applied from the state of FIG. 10 and a masking material is removed.

[Explanation of symbols]

1 ... Mold as a molded product, 5 ... Protrusion, 8 ... Screen, 9 ... Printed surface, 10 ... Print ink, 12 ... Squeegee.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41F 15/08 303 B41F 17/34

Claims (1)

(57) [Claims] 1. A printing method for printing an upper surface of a projection (5) of a molded article (1) having a projection (5) by a screen printing method, wherein an outer peripheral portion of a printing surface (9) of a screen (8) is provided. Is formed wider than the outer peripheral portion of the convex portion (5) of the molded product (1),
After arranging the printing surface (9) on the convex portion (5) of the molded product (1), the squeegee (12) presses the printing ink (10) on the screen (8) to form the molded product (1). )
(5) A method for printing a molded article having a convex portion, characterized by printing on the upper surface.