Extrusion & Post
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PBAT wrinkles and slackness
Problem Phenomenon
PBAT film is wrinkled and slack after winding, uneven after unwinding, and registration is difficult in printing and bag making.
Cause Analysis
Uneven film bubble cooling causes shrinkage differences; thickness unevenness accumulates; winding tension is uneven; improper clamping by the A-frame; the soft characteristic of PBAT amplifies flatness problems.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Optimize film bubble cooling uniformity; ②control thickness uniformity; ③taper control of winding tension; ④adjust A-frame angle and pressure; ⑤correct parallelism of haul-off rollers.
Key Takeaway
Cooling and tension are the main causes of PBAT wrinkles; soft materials require higher mechanical precision; taper tension is the standard winding technology.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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