Extrusion & Post
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PA6 Sausage Casing Film
Problem Phenomenon
The PA6 sausage casing film has an unstable bubble and large thickness deviation during film blowing
Cause Analysis
PA6 melt strength is low, the film blowing bubble stability is poor, and uneven air ring cooling directly causes thickness deviation; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Adopt the downward-blowing water-cooling process to stabilize the bubble; equalize the air ring airflow; select film blowing grade high-viscosity grades; online thickness measurement feedback adjustment for thickness deviation; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PA6 film blowing should use downward blowing with water cooling, and high-viscosity grades improve bubble stability; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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