1 Poor surface coating
Film-like materials have low surface
tension and need to be coated before being made into adhesive raw materials.
Poor coating can lead to ink loss in printing. It usually shows that the ink
falls off in a large area, especially in the tape test, the surface ink will be
stuck by the tape in a large area. At this time, the raw material supplier
needs to replace a batch of qualified materials, or the printing company can
print another layer of primer oil to increase the surface tension, but it will
increase the cost.
2 Poor match between ink and material
The ink loss caused by this reason is
usually manifested as flakes or sporadic. The material cannot be replaced due
to factors such as material cost and customer demand. At this time, you can
find the ink that matches the material through the ink supplier. At the same
time, the printing factory can also take some auxiliary measures, such as
corona treatment of the material in advance.
3 Poor corona effect
The ink loss of the film material is
related to the surface energy of the material. The stronger the surface energy,
the stronger the ink adhesion, and vice versa. However, the corona effect will
decay over time, and it may cause ink loss during printing. This kind of
phenomenon is more common in cheap BOPP and PE materials. Considering the high
coating cost, most manufacturers will carry out corona treatment on them. In
this case, the manufacturer or supplier should re-corona before printing.
4 Poor UV drying
Most of the self-adhesive materials are
printed with UV ink, so if the drying is not complete, the ink will fall off.
This situation manifests as one or two colors of ink falling off. You only need
to increase the power of the UV lamp or replace the UV lamp to solve the
problem.
