JPH0655751U - Printing plate for printing on metal tubes - Google Patents

Abstract

(57) [Summary] [Purpose] The printed characters can be made clear. In the printing plate 14 for printing on the metal tube 1, the surface of the printing convex portion 14A is made rough and the printing convex portion 14 is formed.
The surface corner of A has an R shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printing plate for printing on a metal tube such as a forged tube, a plated tube, and a seamless tube.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, as a printing plate for printing on a metal tube, a printing plate made of an elastic body and provided with a printing convex portion that is pressed against the surface of the metal tube is used. In this printing plate, the printing convex portion to which the ink is attached is pressed against the surface of the metal tube, and the printing character formed by the printing convex portion is transferred to the surface of the metal tube.

[0003]

[Problems to be solved by the device]

 However, the conventional technique has the following problems. Color unevenness occurs in printed characters. Ink drips from the outline of the printed character, and the outline of the character collapses and becomes unclear. The present invention aims to sharpen printed characters.

[0004]

[Means for Solving the Problems]

 The present invention relates to a printing plate for printing on a metal tube, which is made of an elastic body and has a printing convex portion that is pressed against the surface of the metallic tube. Is formed into an R shape.

[0005]

[Action]

 According to the present invention, there are the following effects. By making the surface of the printing convex portion rough, it is possible to uniformly contain the ink on the surface of the printing convex portion, and it is possible to reduce the color unevenness of the printed characters.

By making the surface corners of the printing protrusions R-shaped, ink escape portions are formed at the surface corners of the printing protrusions. As a result, during printing, excess ink does not collect at the surface corners of the printing protrusions, ink dripping from the outline of the printed characters is prevented, and the character outline can be made clear. Since ink dripping can be prevented, ink does not adhere to the surface of the adjacent pipe and stain.

[0007]

【Example】

 FIG. 1 is a schematic diagram showing a printing convex portion of a printing plate, and FIG. 2 is a schematic diagram showing a printing device. As shown in FIG. 2, the printing apparatus 10 has a printing plate roller 11 and a turning roller 12 juxtaposed with each other, and a printing plate 14 can be attached to the surface of the printing plate roller 11 via a printing plate attachment 13. The printing plate 14 is made of an elastic material such as rubber and has a printing convex portion 14A that is pressed against the surface of the metal tube 1. Then, below the printing plate roller 11, an ink roller 15 capable of rolling contact with the printing plate 14 on the printing plate roller 11 is arranged, and the lower half portion of the ink roller 15 is immersed in the ink tank 16.

As a result, in the printing apparatus 10, the metal tube 1 is transferred to the tube rolling area between the printing plate roller 11 and the turning roller 12 and both rollers 11 and 12 are driven. Then, in the process of rolling the metal tube 1, the printing convex portion 14A of the printing plate 14 which is in contact with the ink roller 15 and is supplied with ink is brought into pressure contact with the surface of the metal tube 1, and the printing convex portion 14A forms a printing character. Is transferred to the surface of the metal tube 1. A pressing roller 17 holding the metal tube 1 is brought into rolling contact with the upper surface of the metal tube 1 on both rollers 11, 12.

However, in the printing plate 14, the surface of the printing convex portion 14A is rough and the surface corner of the printing convex portion 14A is R-shaped (see FIG. 1A). FIG. 1 (B) shows a conventional printing convex shape in which the surface is a smooth surface and the surface corners are acute angles.

At this time, the surface roughness of the printing convex portion 14A is preferably 35S to 100S. Further, R of the surface corner of the printing convex portion 14A is preferably 1/10 to 1/5 of the character thickness (width).

In this example, the surface of the printing convex portion 14A was processed with abrasive paper or a file to obtain the above-described rough surface R. In particular, the rough surface was processed with No. 120 carbon abrasive paper.

The operation of this embodiment will be described below. By making the surface of the printing convex portion 14A rough, it is possible to uniformly include ink on the surface of the printing convex portion 14A, and it is possible to reduce the color unevenness of the printed characters.

By making the surface corners of the printing protrusions 14A R-shaped, ink escape portions are formed at the surface corners of the printing protrusions 14A. As a result, during printing, excess ink does not collect on the surface corners of the printing convex portion 14A, ink dripping from the contour of the printed character is prevented, and the character contour can be made clear. Since the ink dripping can be prevented, the adhesion of the ink to the surface of the adjacent pipe does not occur.

[0014]

[Effect of device]

 As described above, according to the present invention, printed characters can be made clear.

[Brief description of drawings]

FIG. 1 is a schematic view showing a printing convex portion of a printing plate.

FIG. 2 is a schematic diagram showing a printing device.

[Explanation of symbols]

 1 Metal tube 14 Printing plate 14A Printing convex part

Claims (1)

[Scope of utility model registration request] 1. A printing plate for printing on a metal tube, which comprises an elastic body and is provided with a printing projection which is pressed against the surface of the metal tube, wherein the printing projection has a rough surface and the surface angle of the printing projection is large. A printing plate for printing on a metal tube, characterized in that the portion has an R shape.