Classification and storage of book printing
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There are many kinds of book printing papers and they are widely used. They have different properties and characteristics. The industrial and commercial departments have different methods for classifying papers. They are generally divided into the following categories:
(1) Printing Paper:
Newsprint, letterpress paper, offset printing paper, placards, coated paper, writing paper, etc.
(2) writing paper:
Writing paper, glossy paper, typing paper, drawing paper, tracing paper, postal seal paper, etc.
(3) Packaging Paper:
Packaging paper, kraft paper, asphalt pile, plant parchment, cellophane, anti-extraction paper, chicken skin paper, cement bag paper and so on.
(4) Other papers;
Wax paper, roll touch paper, color paper, toilet paper, blotting paper, cigarette paper, insulation paper, etc.
(6) Boards:
Yellow board, white board, hemp sheet pile, grey board paper, etc.
In addition to the above, there are many different methods for printing paper catalogs. Album printers mainly control the use of commonly used printing paper, and these papers are often classified by the name of the manufacturer. For example: Jilin Newspaper, Nanping Newspaper; Hanyang Offset paper, Kaishantun offset paper, etc.
How to keep the printed pictures and other papers?
Book printing Paper is one of the important materials in printing production. Therefore, how to store paper well is an extremely important task. Paper from paper mills or warehouses should not be tossed downwards from a height in order to avoid parts and paper damage. Papers must not be erected and should be laid flat. It should not be parked in Lucerne for too long. Shipped into the workshop or warehouse. Papers that have not been subjected to humidity conditioning should be noted in the storage and storage of the following points:
(1) moisture-proof
The main component of the paper is cellulose. The cellulose has hygroscopicity. Therefore, the paper is very sensitive to the humidity of the room air. The moisture content in the album printing paper always changes with the humidity of the air. Especially during the mildew season, the humidity in the room air is very high, and the water content in the paper is relatively increased. If the warehouse is poorly ventilated and is extremely wet, the printed book paper will become moldy and deteriorate.
Therefore, the warehouse where the paper is stored should be selected in a clean and dry place, or directly in the printing shop. When stacking the paper, the paper should be higher than the ground, generally padding foot, not close to the wall, to prevent the paper damp. The indoor relative humidity of the storage is preferably kept at 60-70%, while the temperature is controlled at 18-22 degrees.
(2) Sunscreen
The book printing paper must avoid direct sunlight exposure, otherwise the water in the job is evaporated and crisp, the paper containing lignin is yellowed, and the paper will be warped and not deformed. In severe cases, it cannot be used for printing. Therefore, the window of the warehouse should be coated with white powder on any glass that has sunlight and fire, so that sunlight is not emitted.
(3) Heat protection
The printed book paper should be placed on a place where the temperature is too high. When the general paper is subjected to a high temperature of more than 38 degrees, the mechanical tension must be significantly reduced. At the same time, the paper will be finely deformed. In particular, the paper will stick to pieces and change. Waste products.
(4) Anti-folding
When the album printing paper is placed in the unpacking, the paper should be piled up, and it is absolutely necessary to avoid placing it on one side, because it will cause the paper to buckle and affect the printing use. At the same time when stacking, the two ends of the album printing paper can not be overlapped and protruded, otherwise the protruding part is easy to absorb or release moisture, causing folding and easy to change color yellow, dirty and broken. For counting convenience, each combination can be separated by a small piece of paper.