Copper engraving, also known as "etching engraving", "copper engraving", "copper etching engraving", "corrosion engraving", is a type of engraving. Refers to a type of print that is etched on a metal plate with corrosive liquid or directly carved with a needle or knife. The production of copper engravings is very complicated, and each process has an impact on the final effect of the picture. They are closely connected and cannot be neglected in the slightest. From plate preparation, applying anti-wear agent, mastering the etching time of engraving, the use of special techniques, machine printing, etc. The artist needs to personally control it, and any problem with the process will affect the picture effect. Therefore, excellent copper engravings are considered to be "high-quality products" among prints. The production methods include fly ash method, soft wax method, dry engraving method, etching method, etc., with etching method being the more common.
Specific method: Printmaking is divided into four types: woodcut, copper plate, stone plate, and silk screen plate.
Except for the wood lesson, the other three editions require printing machines to produce.
Production procedure: Prepare a zinc plate. Copper plates are too expensive, so zinc plates are generally used instead. The same as the required screen size, generally the smaller A3 paper size is suitable because of the convenience caused by the machine.
Then prepare concentrated nitric acid and dilute it with water to a 5% concentration liquid, which requires test paper for testing. Commonly found in chemical stores.
Red powder, an anti-acid powder, mixed with No. 6 oil into a paste, is used to cover areas that do not need corrosion.
An engraving needle is a tool used to score lines on a zinc plate. Use a small round steel file to grind it into a sharp point on a grinding wheel.
The printing press is the largest piece of equipment. , all manual, used for final printing
There are also printing inks, which are generally sold in printing supply stores. 18 yuan for a large box
The above are the basic items.
In fact, there is also a commonly used fly ash device, which you can make yourself. In it, the rosin powder is blown up with a blower and falls freely on the zinc plate, and then it is weakly baked with an alcohol lamp to melt it, and then Put it in acid to corrode, producing gray blocks.
Use an engraving needle to draw a sketch on the board and carve out the desired appearance
Finally, mix the ink with diluted No. 6 oil, not too thin, and it can drip. But very slow. Scrape it on the plate, fill in the various traces on the zinc plate, and then wipe off the excess ink with scraps of newspaper and wipe it clean. What is left in the end are the nicks and corrosion marks filled with ink
< p>The above is the completion of plate makingFinally, place it on the printing press, put on the thick cardboard that has been issued, and print it out.
To make paper, wet the paper with a watering can and seal it in plastic film until it becomes soft and easy to print.