Extrusion & Post
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Poor printability of metallocene linear low-density polyethylene film (variant: startup commissioning scenario)
Problembeschreibung
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 during new machine commissioning or initial startup, this problem is more prominent and requires focused attention.
Ursachenanalyse
(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) During new machine commissioning or initial startup, process parameter fluctuations or equipment condition changes aggravate this problem
Lösung
(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 parameter recording and archiving; pay special attention to parameter stability during new machine commissioning or initial startup
Wichtigste Erkenntnis
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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