Extrusion & Post
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LDPE Film Gel Particle
Problem Phenomenon
The film shows gel particles and agglomerates, appearance is downgraded, and ink breaks during printing
Cause Analysis
Gel particles originate from gel in the resin itself, degraded material, and impurities; insufficient filtration precision lets them pass through the screen; cross-linked particles brought in by recycled material are a common source; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① High-efficiency melt filtration to intercept gel particles; ② clean sorting of recycled material; ③ regularly clean degraded material from the barrel and die; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Gel particles are the deadly enemy of film appearance; filtration plus sorting plus cleaning, three defense lines to protect transparency; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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