Extrusion & Post
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PBAT blocking and poor opening property
Problem Phenomenon
PBAT film layers block together, bag opening is difficult during bag making, the automatic packaging machine jams bags, and the yield rate decreases.
Cause Analysis
PBAT molecular chains are soft and contain polar ester groups, so the film surface friction coefficient is high; the inner surfaces of the film bubble stick together after blown film; the anti-blocking agent is insufficient or unevenly dispersed; the winding tension is too high and compacts the film.
Solution
①Add anti-blocking agent (zinc stearate, silica types); ②control winding tension to avoid compaction; ③wind up only after the film bubble is fully cooled; ④optimize dispersion of the lubricant in the formulation.
Key Takeaway
Poor opening property of PBAT is a common problem of biodegradable films; anti-blocking agent and tension control work together; zinc stearate has both slip and anti-blocking functions.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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