Extrusion & Post
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HDPE film poor opening
Problem Phenomenon
Two layers of the film stick together after winding, making bag opening difficult.
Cause Analysis
Insufficient slip/anti-blocking agent in HDPE film or slow migration; high winding tension and high film temperature aggravate blocking.
Solution
①Add/adjust anti-blocking agent and slip agent; ②reduce winding tension; ③fully cool the bubble before winding; ④control storage temperature.
Key Takeaway
Opening is controlled by three controls: additives + tension + temperature.
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