In the process of using the original film, two problems often occur: one is "deviation"; the other is "poor overprint". Regarding the solutions to these two problems, industry veterans elaborated on the techniques.
Reasons for deviation
1. Problems with membranes
There are mainly the following problems:
â‘ Film winding is uneven;
â‘¡The film thickness is uneven, with ruffles;
â‘¢ The film is too slippery and slippery;
The solutions to the above problems are mainly left to the membrane manufacturers to deal with.
2. Problems with equipment
The tension setting of the printing press does not match or the tension system fails. The gravure printing machine generally has four stages of tension control to form a tension control system, which are unwinding tension, feeding tension, discharging tension and winding tension respectively.
In the case that the membrane itself is normal, only the proper setting of the four-stage tension can ensure the smooth running of the membrane, otherwise the problem of deviation will occur.
Reasons for poor overprint
1. The overprinting system of the equipment is aging, and the inaccurate correction can lead to large overprinting errors; poor tension control leads to instability of the film running machine and causes poor overprinting;
2. Uneven thickness or wrinkling of raw materials will cause overprint deviation and cause poor overprint;
3. If the temperature of the drying oven is set too high, the amount of heat deformation of the material will increase, resulting in poor overprinting;
4. Plate-making: When overlay printing, it is necessary to reasonably design the expansion and contraction of the plate according to the characteristics of the printing materials; small text or lines are very prone to poor overprinting during overlay printing, so it is best to design small text or lines Use spot color or single color output, do not use multi-color printing.
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