Material Analysis
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PBAT low heat seal strength
Problem Phenomenon
Heat seal strength of PBAT bag making is insufficient, the seal easily cracks, and the packaging sealability is unqualified.
Cause Analysis
PBAT heat seal window is narrow; heat seal temperature, time and pressure do not match; excessive filler addition affects heat sealing; uneven film thickness causes local poor heat sealing; heat seal surface contamination.
Solution
①Orthogonal optimization of heat seal temperature, time and pressure; ②control filler addition ≤15%; ③ensure thickness uniformity; ④clean the heat seal surface; ⑤heat seal strength test verification.
Key Takeaway
PBAT heat seal performance is affected by filler and thickness; the process window requires fine management; strength testing is the acceptance basis.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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