600 Printing Zinc Plates Were Sent To Thailand Customer

On April 8,  600 printing zinc plates were sent to Thailand customer.

Etching process parameters of magnesium etching plate

The etching plate is a metal template for the printing industry (hot stamping). At present, there are mainly three kinds of etching plates of copper alloy, zinc alloy and magnesium alloy on the market.

In recent years, with the vigorous development of printing and packaging industries, companies have continuously improved the quality requirements of metal stencils, and heavy metal ion pollution has been strictly controlled by environmental protection policies. Therefore, it has low density, fast heat dissipation, high hardness, easy mold release, and neat slope. , Smooth edge, easy to stick plate, hot stamping speed faster than copper and zinc plate, higher printing resistance rate than zinc plate, easy processing, low production cost, no pollution to the environment, etc. Magnesium alloy plate, since the early 1990s When it was put on the market in the United States, its superiority was generally recognized by the industry.

At present, the Americas and Europe are engaged in plastic, leather embossing, high-frequency molds, heat transfer, clothing trademarks and self-adhesive knife molds, shoe sole molds, conference logos, house signs, medals, nameplates, product trademarks, badges, and Braille signs. Among other products, magnesium alloy etching plates are widely used.

However, at present, there is no mature etching process for preparing magnesium alloy etching plates in China, which leads to unstable performance of magnesium alloy etching plates, which is mainly reflected in the poor etching edge slope and many pitting defects that affect the quality of bronzing. When making relief or intaglio plates for etching, the optimal process parameters for etching are as follows:

(1) Rotation speed:

When making the letterpress, the speed of the etching machine blade is 420-430rpm;

When making gravure, the speed of the etching machine blade is 370-380rpm;

The speed has a great influence on the slope of the edge of the etching pattern. If the speed is too low, the slope will be too slow, and if the speed is too high, the slope will be too steep;

(2) Etching liquid temperature:

When making relief plates, the temperature of the etching solution is 33-34°C when loading the plate; when publishing, the temperature of the etching solution is 38-39°C;

When making gravure, the temperature of the etching solution is 35-36℃ when loading the plate; when publishing, the temperature of the etching solution is 38-39℃;

The etching temperature has a great influence on the etching speed and etching quality. If the temperature is too high, the etching reaction will be too intense, which will cause the etching plate to be partially thin or even perforated; if the temperature is too low, the reaction will be slow and the etching depth will not be enough;

(3) Etching time:

When using a newly prepared etching solution, when the etching time is 5 minutes, the etching depth of the magnesium alloy plate is 0.7-0.8mm; if you want to etch to other depths, you need to extend the etching time proportionally; when using a non-newly prepared etching solution, According to the etching depth of the previous magnesium alloy plate, gradually extend the etching time of the next magnesium alloy plate. If the etching depth is found to be reduced by 0.1mm, the etching time will be correspondingly extended by 30-40s;

(4) Acid supplement:

After each magnesium alloy plate is etched, it needs to be supplemented with acid. The method for supplementing the acid includes: supplementing 65-75ml of nitric acid for every 10g of magnesium alloy etched. The preparation steps of the etching solution include: preparing an aqueous solution of nitric acid with a Baume degree of 13.5-14.5, and then adding an etching additive, the volume of which is 4%-5% of the total etching solution volume. In acid supplementation, the concentration of nitric acid is 66-70%.