1. Poor surface coating
Film materials have low surface tension and
need to be coated before being made into film adhesive labels. Poor coating
will lead to ink loss while printing. At this time, printing another layer of
primer oil to increase the surface tension is a good choice to avoid ink
dropping, but it will increase the cost.
2. Poor compatibility between ink and
If film adhesive labels appear patchy or
sporadic Ink dropouts, printing ink may be not matched with material for
printing. Considering high material cost and unchangeable customer demand, the
ink that matches the material can be changed through contacting with the ink
supplier. At the same time, it’s not a bad way to take some auxiliary measures,
such as corona treatment to the material in advance.
3. Poor corona effect
The corona effect will decay over time,
which may cause ink dropout during printing. Cheap BOPP and PE adhesive materials
usually face this issue. Considering the high coating cost, it is suggested to re-corona
the material before printing.
4、Bad UV drying
Most self-adhesive materials are printed
with UV ink. If the drying is not complete, it will lead to ink loss in
material. You’d better increase the UV lamp power or replace the UV lamp to
solve the problem.
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