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Poor printability of metallocene linear low-density polyethylene film (variant: material or color changeover scenario)
Fenómeno do problema
Printing ink adhesion on the film surface is poor, and printed patterns fall off or are blurred.
Poor printability affects product appearance and affects product quality in printed packaging film.
Especially when changing materials or colors, this problem is more prominent and requires focused attention.
Análise das causas
(1) Metallocene linear low-density polyethylene has low surface energy (<32dyn/cm), and ink wettability is poor
(2) Film surface treatment is insufficient (corona treatment is not enough)
(3) There are exudates on the film surface (migration of slip agents and antiblocking agents)
(4) The ink does not match the film
(5) Printing environment humidity is improper
(6) When changing materials or colors, process parameter fluctuations or equipment condition changes aggravate this problem
Solução
(1) Perform corona treatment to increase film surface tension to 38-42dyn/cm
(2) Control corona treatment power and treatment time to ensure uniform treatment
(3) Control additive dosage to avoid excessive migration
(4) Select ink types that match the film
(5) Control printing environment humidity at 50-60%
(6) And do a good job of transition material cleaning; pay special attention to parameter stability when changing materials or colors
Conclusão principal
Poor printability is caused by low surface energy and needs to be improved by increasing surface tension through corona treatment to improve ink adhesion.
In different production scenarios, targeted preventive measures need to be taken.
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