JP2928354B2 - Manufacturing method of illuminated rubber sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the manufacture of an illuminated rubber sheet in which only characters and pictures on a key surface of an electronic device such as a cellular phone and a car stereo are transmitted. It is about the method.

[Prior Art] Conventionally illuminated characters are printed on a character display surface made of a translucent material with predetermined characters or the like using a material not attached to the character display surface, and then coated with a paint to be attached to the translucent material. A manufacturing method in which a paint is applied with a spray gun or the like, and then the non-adhesive material of the character line portion printed earlier is removed, and the coating film thereon is removed by washing or the like, leaving only other opaque areas. Has taken.

[Problems to be Solved by the Invention] In the conventional method, in the case of a rubber sheet using silicone rubber, the ink that does not adhere to the silicone rubber does not fit well, so that bleeding at the time of printing and chipping are likely to occur. It was difficult to form thin characters and thin lines.

[Means for Solving the Problems] In the present invention, printing is performed using an opaque material attached to the display surface other than the character portion to be illuminated, and the portion to be illuminated is formed as a blank character. Then, masking is performed with a material that does not adhere to the entire printed portion, and painting is performed. Then, a method of removing the coating film on the masking material together with the masking material is adopted.

Example A transparent silicone rubber 1 is vulcanized and molded with a rubber mold, and a white silicone ink 2 is screen-printed solidly on the top surface of the molded silicone rubber product 1 and thermally cured at 200 ° C. The white color is the undercolor of the font of the blank character, so that the font can be seen clearly even when there is no illumination from below.

Next, on the white solid printing on the top surface, the character 3 to be illuminated is extracted with black silicone ink and character screen printing is performed.
Thermoset at 200 ° C. Thereafter, the entire top surface is masked using a material 4 such as urethane ink which does not adhere to the silicone ink. The entire surface of the silicone rubber is spray-coated with a black silicone paint 5 and thermally cured at 180 ° C to 200 ° C.

The masking part 4 and the black coating film 5 on the masking part are removed by a method such as water washing.

[Effects of the Invention] Characters to be illuminated are printed with ink attached to silicone rubber and then printed, and then the entire printed portion is masked with ink that is not attached, thereby illuminating characters and the like thinner than conventional products. It is now possible to handle the large number of kanji that have recently increased in strokes.

[Brief description of the drawings]

 FIG. 1 is a sectional view of an illuminated rubber sheet according to the present invention. FIG. 2 is a cross-sectional view of a conventional illuminated rubber sheet. DESCRIPTION OF SYMBOLS 1 ... rubber elastic body, 2 ... color printing part 3 ... blank character part, 4 ... masking part 5 ... coating part, 11 ... rubber elastic body 12 ... color printing part, 14 ... masking part 15 ...... Painting part

Claims (1)

(57) [Claims] 1. A screen or a screen for printing out characters or patterns to be illuminated with an opaque silicone ink on a display surface of a silicone rubber molded product, and then masking the surface with a material that does not adhere to the silicone ink. A method for producing an illuminated rubber sheet comprising a step of applying a surface coating with an opaque silicone paint and then removing the masking portion and the surface coating on the masking.