Extrusion & Post
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Poor printability of homopolymer polypropylene film
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.
Cause Analysis
(1) Low surface energy of homopolymer polypropylene (<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
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%
Key Takeaway
Poor printability is caused by low surface energy; ink adhesion needs to be improved by increasing surface tension through corona treatment.
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