Processing Machinery
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LDPE Film Heat Sealing
Problem Phenomenon
Insufficient heat seal strength or wrinkled seal edges, with a high bag-making scrap rate
Cause Analysis
The three elements of heat seal temperature, pressure, and time are mismatched; uneven film thickness makes sealing inconsistent; excessive slip agent migrating to the sealing surface reduces heat seal strength; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
① Orthogonal optimization of heat seal temperature, pressure, and time; ② control of film thickness uniformity; ③ control of slip agent content on the sealing surface; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LDPE heat sealing is a window process of three elements; film thickness and slip agent are two hidden variables; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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