Extrusion & Post
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PE Film Blocking and Poor Opening
Problem Phenomenon
Two layers of the film roll stick together, bag opening is difficult, white marks appear when torn apart, and the machine runs poorly on high-speed bag making machines.
Cause Analysis
PE film slip/anti-blocking agents are insufficient or insufficiently bloomed out; excessive winding tension, high film temperature and high storage temperature all aggravate blocking; LDPE/LLDPE film surfaces are more tacky and more prone to blocking.
Solution
①Add/adjust the anti-blocking agent (silica type) and slip agent (erucamide type) as needed; ②reduce the winding tension; ③wind only after the bubble is fully cooled; ④control the warehouse temperature and first-in-first-out; ⑤balance the slip against subsequent printing and lamination conflicts according to the application.
Key Takeaway
Film blocking = three controls of 'additive + tension + temperature': additives manage the surface, tension manages the contact pressure, temperature manages blooming and creep; too much slip agent affects lamination, and the dosage must be carefully balanced according to the final application.
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