Solve the problem of offset printing field

current. The appearance design of packaging products adopts large blocks of color in large quantities to highlight the bright spots of the products so as to stimulate the visual effects of humans. This gives us great trouble in the operation of offset printing.

One. Large field version of the product due to the original requirements of strong ink, to achieve the original requirements must use two versions of the ink, in order to print thick flat clothes, due to the large amount of ink. The amount of water also increases accordingly, resulting in an increase in the degree of ink emulsification, a longer drying time of the product, a simultaneous extension of the processing cycle, and a drastic reduction in work efficiency. This often leads to delays in short-lived jobs requiring fast delivery times.

Second, Due to the large amount of ink, although preventive measures were set up in the earlier period, some carelessness still caused sticky phenomenon, and the amount of “dusting” had to be increased, which in turn caused certain difficulties for post-press processing. Although powder removing measures were taken before coating and coating, the powders embedded in the ink were difficult to remove. The products covered with the coating and after polishing were left in the ink, and there were ghost spots and pits. Causes the appearance of the product to be affected.

In order to solve the above-mentioned problems, through peer recommendation, we chose the "Zebao" anti-adhesive and dirty product manufactured by China Science and Technology University. According to the requirements of the product specification, the “Inkpo” containing 7% ink is added to the actual color ink. The ink is made from Shanghai peony fast-dry black ink. The ink is printed on two plates at the same time. The plate faces 80% on the ground, and the paper uses 300g. Gray version of cardboard, and appropriate adjustments, reduce the amount of water, boot speed 10000 / hour, completely shut down dusting. 1,500 sheets (stacked paper) were initially printed and tested, and the ink drying rate was accelerated. The back of the product is not sticky, and the ink transfer performance is normal during the printing process. No ink roller crust conjunctiva phenomenon occurs during the operation or shutdown of the machine. Half an hour after the printing, red and yellow overprints were carried out. After the overprinting, the film was applied for half an hour. The pockmarks of the pimples that had originally appeared due to a large amount of dusting were completely disappeared. The tested products basically meet the proof requirements. After the initial test was successful, the following 6000 printings were processed in the same way. No error occurred during the entire operation. In this regard, the author realized that the difficulties encountered in handling operations, can not stick to the rules, we must boldly innovate and find new ways to solve, especially on the market emerging new materials, we must continue to sum up experience in practical work in order to become passive In order to take the initiative, improve the level of operation and solve the new problems that constantly appear in production.