Business card offset printing technical guide
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First, the principle of offset printing
Ink and ink mixing, offset printing is based on the basic principle of no ink mixing, and then combined with PS plate oil absorption drainage water absorption and drainage for printing.
Second, what is the PS board?
PS board is the abbreviation of PreSenSitZedPlates.
Third, how to ensure the quality of the printing plate
The time of drying the new iodine gallium lamp is generally controlled between 300 autumns. With the aging of the iodine gallium lamp, the ultraviolet light gradually weakens, and the side printing time should be lengthened by 20-40 autumn. The normal iodine gallium lamp is used. The life span is 3000 triggers. It can be used for 2 years according to the daily touch 4-5 times.
Fourth, developing PS board
When washing, the weight of the developer is very important, and the direct view to the clarity of the graphic network. Strictly speaking, the ratio of water added to the prepared developer is 1:8. The development time is controlled between 12-15 seconds, then the surface of the plate is washed with water, and the remaining developer on the surface is completely rinsed off.
Fifth, the basic steps of printing business cards
1. Ink on the machine (to order ink)
2. Water roller ink
3. Install the sink, 4. Add water
5. Upper plate, adjust PS plate parallel
6. Repair board
7. Clean board
8. Test print positioning
9. Printing
6. Should you pay attention to those issues during the printing process?
1. It is necessary to have a uniform layer of ink on the water roller and the water roller before starting the water supply.
2, in the printing process, the left and right positioning must be based on the carton left paperboard.
3, the sides of the PS board must be treated as necessary to avoid damage to the * plate roll.
4. According to the size of the paper to be printed, when adjusting the position of the pushing paper, the paper pusher should be moved to the last end, and the position of the pushing paper should be adjusted to about 1cm from the last end of the business card paper.
5, the plate pressure is generally not arbitrarily adjusted because the basic PS plate thickness is the same.
6. The manual ink control can only be applied when the ink quantity preset in the function key is turned on at the same time. If the function key shows 11-0F, pressing this switch will not respond.
7, cut when cleaning, do not let gas, ink, splash into the gear. In order to avoid shortening the service life of the rubber roller and the roller due to the dry surface of the ink, both ends of the rubber roller and the roller must be wiped clean.