What was the early color printing house like?

  One of the relief printing technologies of Dalian Color Printing Factory was called aniline printing in the past. Rubber and soft resins are used as printing plates, and water-soluble or alcohol-soluble inks are used for printing. Aniline dyestuff is used, so it used to be called aniline printing. Usually suitable for printing plastic bags, labels and corrugated paper. The fineness of dots and lines in printing is gradually approaching offset printing. Gravure printing is comparable to photography. Because plate-making is expensive and printing must be large, it is also one of the less commonly used methods. Applicable to the printing of securities, stocks, gift certificates, commercial creditworthiness certificates or stationery, etc.

  The principle of printing is similar to that of seals. Early woodblock printing, movable-type printing and later type printing all belong to relief printing. Full-page printing usually uses heavier colors, such as black and red, on the whole impression. It is usually used in making the cover of albums, packages or color boxes. A part of the dots on the printing plate are the same size and account for a certain proportion of the whole printing pattern. After printing, the color of the paper is the same shade and looks very uniform. Openings are usually divided into three types according to size: large, medium and small.

  For 787 *1092 paper, more than 12 are large-sized, 16-36 are medium-sized and less than 40 are small-sized, but the books mainly written are medium-sized. Except for 6, 12, 20, 24 and 40 openings which are approximately square in shape, the other openings are rectangular in different proportions, which are suitable for different kinds of books with different properties and uses.

  Different products have different printing methods. Printing methods include offset printing, transfer printing, hot transfer printing, stamping and so on. Scanning resolution: The resolution set before scanning an image. It will affect the quality and performance of the generated image file. It determines how the image will be displayed or printed. Web pages have a resolution of 72 dpi, because most well-printed books are printed with 175 to 200 lpi. The scanning resolution of wide-format printing is 75-150 dpi. For large-format images (such as posters), low resolution is acceptable, and low scale mainly depends on the distance of view.