Extrusion & Post
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Poor printability of linear low density polyethylene film (Variant: strengthened measures)
Problem Phenomenon
Poor ink adhesion on the film surface, printed patterns fall off or become blurred.
Poor printability affects product appearance and product quality in printed packaging film.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires key attention.
Cause Analysis
(1) Low surface energy of linear low density polyethylene (<32dyn/cm), poor ink wettability
(2) Insufficient film surface treatment (inadequate corona treatment)
(3) Exudates on film surface (slip agent, anti-blocking agent migration)
(4) Ink and film mismatch
(5) Improper printing environment humidity
(6) On the original basis, additional attention is needed as process parameter fluctuations or equipment status changes have aggravated this problem
Solution
(1) Perform corona treatment, increase film surface tension to 38-42dyn/cm
(2) Control corona treatment power and time, ensure uniform treatment
(3) Control additive dosage, avoid excessive exudation
(4) Select ink types matching the film
(5) Control printing environment humidity at 50-60%
(6) And strengthen process monitoring; on the original basis, additional attention is needed, with special attention to parameter stability
Key Takeaway
Poor printability is caused by low surface energy; ink adhesion needs to be improved by increasing surface tension through corona treatment.
Targeted preventive measures need to be taken in different production scenarios.
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