2015年3月20日星期五

The Process Principle of Offset Printing

"Offset printing" and "lithography" is one meaning. This kind of printing method is through the drum colloid impression touch the glue on the surface of the ink transfer to the paper. Due to the plastic surface is flat, without concave decorative pattern, so the design of printed on paper and decorative pattern is flat, poor stereo feeling, antifalsification is poor. Required for offset printing ink is less, mould manufacturing cost is lower than the gravure.
Also known as Offset printing (Offset), Is a kind of lithography, can restore the original color, contrast and level of the original pattern clearly with high precision, is by far the most common method of paper printing. Applicable to poster, profile, instruction, paper, packaging, books, magazines, calendars, and other relevant color print.
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Offset Printing Process Principle
Offset printing is the color theory as the center, using the latest achievements of science and technology, using industrial mass production, copy of the original pattern system engineering. In the process of printing process, From the review of the original pattern, process design to each of the plate making, printing process, process parameters must be determined strictly, directly involved in printing colour information transmission of psychological evaluation and quantitative detection.
Distinguish between "gravure" and "offset", see the colors and stereo feeling of decorative pattern can determine. If the two bill to contrast, the difference is very obvious, it is easy to judge. In addition to a beginner, also can use the following two methods: the first is a "touch". Gravure RMB frontal "The people's bank of China" six words, the feeling of bulging is very obvious, as long as the fingers touched gently from left to right, can clearly feel that every word is raised. The second is "the edge". Gravure printing of text and pattern, line edge will be a spreading of ink caused by tiny "burr", use a magnifying glass can see very clear. And offset printing the line edge is smooth.
The selective adsorption principle of plate
Branches in assaying principle; Indirect printing principle; Principle of oil and water should not be.

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