JPH0619573B2 - Method for forming screen plate on hemispherical substrate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for forming a screen plate on a hemispherical substrate.

(Prior Art and its Problems) When printing is performed on a hemispherical object 10 to be printed using a conventional screen printing plate as shown in FIG. 6, a screen printing plate 11 having a right circular cylinder pattern 11a is formed as shown in FIG. Since it was used, only the cylindrical printed body 12 was obtained as shown in FIG. 8, and spherical printing could not be performed on the spherical printing target by screen printing.

Therefore, when printing is performed on a curved surface-shaped printing medium, a photomask which is in close contact with the curved surface-shaped printing medium is formed by a photo-etching method as shown in JP-A-55-2257.
This photomask was fitted on a curved surface-shaped printing medium, and exposure and etching were performed by a usual method. However, since this method cannot use a squeegee like screen printing, it is not suitable for mass production and there is a problem that it becomes expensive.

(Means for Solving Problems) An object of the present invention is to solve the above problems, and an image having a small circular pattern in the central portion of a hemispherical object to be printed by coating a photosensitive resin film on a mesh. The first baking is performed by stacking the films, the photosensitive resin film is applied thereon, and the second baking is performed by stacking the image films having a concentric circular pattern having a diameter slightly larger than the small circle in the central portion. Then, a concentric circular pattern having a slightly larger diameter is sequentially printed, and finally developed to form a screen plate having an inner surface having a stepped hemispherical surface, and the screen plate is fitted onto a hemispherical substrate. ,
It is characterized in that printing can be performed on a hemispherical printing target.

(Example) Next, the method of the present invention will be described in sequence with reference to FIGS. First, the first-layer photosensitive resin film 2 is applied to the screen mesh 1 shown in FIG. Then, as shown in FIG. 2, the image films F1 having the central small circular pattern 2a of the hemispherical substrate 10 are overlaid and the first layer is printed. Then, as shown in FIG. 3, a second-layer photosensitive resin film 3 is applied thereon. Next, as shown in FIG. 4, an image film F2 having a concentric circular pattern 3a having a diameter slightly larger than that of the central small circular pattern 2a is overlaid and the second layer is printed. In this manner, the concentric circular patterns 4a and 5a having a slightly larger diameter are sequentially printed, and finally developed to form the screen plate 7 having the stepwise hemispherical surface 6 as shown in FIG.

At the time of printing, the stepped hemispherical surface 6 of the screen plate 7 is fitted onto the hemispherical object 10 to be printed, and screen printing is performed with a squeegee.

It should be noted that the present invention can be applied to other curved surface-shaped objects other than the hemispherical object.

(Effect) In the present invention, a photosensitive resin film is applied on a mesh, an image film having a small circular pattern at the center of a hemispherical object is overlaid, and the first baking is performed, and the photosensitive film is formed thereon. A resin film is applied, an image film having a concentric circular pattern having a diameter slightly larger than that of the central small circle is overlaid and the second baking is performed, and then a concentric circular pattern having a slightly larger diameter is sequentially baked. Finally, it is developed to form a screen plate having an inner surface having a stepped hemispherical surface, and the screen plate can be fitted onto a hemispherical substrate to be printed so that printing can be performed on the hemispherical substrate. Therefore, it is possible to print on a curved surface by screen printing, which is more suitable for mass production and cost reduction than the conventional method.

[Brief description of drawings]

1 to 5 are diagrams for sequentially explaining the method of the present invention, and FIG.
FIG. 7 is a front sectional view of a hemispherical printing medium, FIG. 7 is a front sectional view of a screen plate on which a right circular cylinder pattern is formed, and FIG.
FIG. 7 is a front cross-sectional view printed on the hemispherical printing medium shown in FIG. 6 by the screen plate shown in FIG. 1 ... mesh 2,3,4,5 ... photosensitive resin film 2a, 3a, 4a, 5a ... concentric circular pattern

Claims (1)

[Claims] 1. A photosensitive resin film is applied onto a mesh, and an image film having a small circular pattern at the center of a hemispherical object to be printed is superposed and the first baking is performed, and the photosensitive resin film is formed thereon. Is applied, the image film having a concentric circular pattern with a diameter slightly larger than the central small circle is overlaid, and the second baking is performed, and then a concentric circular pattern with a slightly larger diameter is sequentially baked, and finally. A hemisphere which is developed so as to form a screen plate having an inner surface having a stepped hemispherical surface, and the screen plate is fitted onto a hemispherical surface-shaped printing medium to enable printing on the hemispherical surface-shaped printing medium. A method for forming a screen plate on a sheet to be printed.