Extrusion & Post
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HDPE film blocking and poor opening property
Problem Phenomenon
The film layers stick together after winding, making opening difficult during bag making, and it is more serious at the heat seal.
Cause Analysis
The raw material lacks anti-blocking agent or slip agent; too high melt temperature makes the film surface sticky; excessive blow-up ratio, insufficient cooling and too fast haul-off all aggravate blocking.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Select a film-blowing special material containing anti-blocking agent or add anti-blocking masterbatch; ②appropriately lower the extrusion temperature; ③reduce the blow-up ratio; ④strengthen cooling and slow down the haul-off.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Opening property is a key performance for film post-processing; the three factors of additives, temperature and cooling are managed synergistically.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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