Method for making zinc plate printing plate and method for making the obtained printing plate

The invention relates to a method for producing a zinc plate printing plate and the obtained printing plate, in particular to a method for producing a microcrystalline zinc plate printing plate for hot stamping anodized aluminum pressure relief process in letterpress printing and the obtained printing plate. The produced printing plate.

For a long time, hot stamping anodized aluminum pressure bumps are two different printing processes. During printing, two printing plates are made and printed in two times. This printing process not only wastes raw materials, but also has low production efficiency. Due to unstable overprinting, the loss of semi-finished products is large.

The purpose of the present invention is to provide a method for making a zinc plate printing plate which can eliminate the above-mentioned shortcomings and complete the hot stamping of anodized aluminum by pressing and embossing at one time, and the zinc plate printing plate obtained by this method.

In order to achieve the above purpose, the present invention adopts the method of layered corrosion, and its technological process is manuscript design→photography→zinc plate→first corrosion→coating protective agent→second corrosion→printing plate. The specific steps are to first design the manuscript according to the needs of printing, and draw the part to be embossed in the anodized aluminum as a hollow pattern during printing. The edge of the hollow pattern plays the role of embossing or breaking the electro-chemical aluminum during printing. Take the designed original into a negative picture and dry it on the zinc plate. The first corrosion of the sun-dried zinc plate is carried out in a basin at room temperature with nitric acid with a degree of Baume of 2°-15° for 50-1260 seconds. If the concentration of nitric acid is too low, it is difficult to corrode to the required depth; if the concentration of nitric acid is too high, it is easy to rot and lose shape. It is difficult to achieve the expected corrosion depth if the corrosion time is too short or too long. The specific corrosion time can be determined according to the concentration of nitric acid, the amount of dissolved zinc and the required corrosion depth of the layout. For the printing plates with small strokes or lace, which are easy to rot or lose their shape when corroded, the conventional powder-free corrosion method can be used, and the machine is corroded for 50-240 seconds. The preparation of powder-free etching solution, the liquid temperature and the rotation speed of the etching machine are the same as those of conventional powder-free etching. If the corrosion time on the machine is too short or too long, it is difficult to make the layout reach the expected corrosion depth. The specific time of corrosion can be determined according to the liquid temperature, rotation speed, acidity, dissolved zinc content and layout corrosion depth. The first corrosion makes the corrosion depth of the zinc plate without protective film reach 0.4-2.2 silk meters. After the first corrosion, apply a protective agent to the layout pattern on the zinc plate that does not need to be further corroded. The protective agent can be shellac paint or benzene ink, or other anti-corrosion substances. After drying the protective agent, use the conventional powder-free corrosion method to carry out the second corrosion of the zinc plate on the machine. During the corrosion process, pay attention to the balance among the liquid temperature, rotation speed, time, acidity and dissolved zinc amount. . The second corrosion brought the corrosion depth of the zinc plate to the depth of the conventional letterpress printing plate. After two times of corrosion, the protective agent is washed off to obtain a zinc plate with a depth of two layers.