DE3328923A1 - Printing block for pad transfer machines - Google Patents

Abstract

The invention relates to a printing block or printing plate for use in pad transfer machines which is relatively lightweight and whose surface is easy to treat. The base metal used is aluminium; provided on the surface of the printing block is a photosensitive layer by means of which the printed image is etched into the surface. <IMAGE>

Description

Printing cliché for pad printing machines and processes too

its manufacture

The invention relates to a printing cliché for pad printing machines and a method for its production-such Printing blocks or printing plates have hitherto been made of steel or the like material. Apart from that Because of its heavy weight, the surface treatment of the steel is much more complex.

According to the invention, a printing block is therefore proposed, which has aluminum as its base material and the surface of which has an oxide layer, e.g. created by electrolytic oxidation, into which the printed image is etched.

The new printing block is expediently thereby made that the base material with a photosensitive Layer is coated that then the print image by appropriate exposure and subsequent development introduced into the photo layer and finally the print image over the stencil created in this way by etching is transferred into the base material.

The invention is characterized by simple manufacture and low material and manufacturing costs.

The invention is explained in more detail with reference to Figures 1 and 2, whereby

Fig.1 the pressure plate and Fig.2 shows section A-A of Fig.1.

Fig. 1 shows the new printing plate in perspective. The thickness of the plate depends on the application and is usually 1, 3, 5 or 10 mm thick. the Letters TDS represent the printed image etched onto the surface.

To explain the exact training and manufacturing process serves the Fig.2, which reproduces the section A-A.

The pressure plate 1 consists of the aluminum base plate 2; the surface is electrolytically oxidized, for example by anodizing process, or hard anodized, so that an oxide layer 3 results, which can be between 5 and 30 μ depending on the application in the printing machine. It is useful if the hardness of the oxide layer is 200 to 400 HB (25-45 HRC).

Above the oxide layer 3 there is a photosensitive one Layer 4, e.g. a photoresist.

The photo layer 4 is exposed to the print image, e.g. TDS and developed in a suitable manner so that on the surface of the printing plate 1 a corresponding stencil arises. Etching with a suitable etching medium is used to create the printed image in the surface of the printing plate 1 etched in, as indicated by 5.

The finished print image can now be transferred to the tampon in a manner known per se.

- blank page -

Claims (2)

Claims 1. Printing cliché or printing plate for use in pad printing machines, characterized in that the base plate (2) is made of aluminum with a thickness between 1 and 10 mm consists in whose surface, which is coated with an oxide layer (3), the print image (5) by exposure and developing the photo layer (4) and subsequent etching is introduced. 2. Process for the production of the printing plate or the Printing plate according to claim 1, characterized in that the a surface of the base plate made of aluminum coated with an oxide layer, initially with a photo layer is coated so that the photo layer is then exposed to the printed image and then developed and that finally the print image is etched into the surface of the base plate using the stencil created in this way.