Material Analysis
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Insufficient heat seal strength of homopolymer polypropylene film
Problem Phenomenon
After film heat sealing, seal strength is low, and the seal cracks under stress.
Insufficient heat seal strength affects packaging tightness, causing leakage in food packaging film.
Cause Analysis
(1) Heat seal temperature too low, insufficient melting
(2) Insufficient heat seal pressure or time
(3) Uneven film thickness, heat seal area too thin
(4) Film surface contamination or additive exudation
(5) Improper heat seal material selection
Solution
(1) Adjust heat seal temperature according to the melting point of homopolymer polypropylene, generally 10-20°C above the melting point
(2) Increase heat seal pressure to 0.2-0.4MPa, heat seal time 0.5-2s
(3) Ensure uniform film thickness, especially at heat seal areas
(4) Control additive dosage, avoid surface exudation affecting heat seal
(5) Use heat seal layer materials when necessary (such as LDPE, EVA, etc.)
Key Takeaway
Insufficient heat seal strength is caused by improper temperature, pressure, or time settings; heat seal process parameters need to be optimized.
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