Material Analysis
6 조회수
Insufficient heat seal strength of polyolefin plastomer films
문제 현상
The seal strength of the film after heat sealing is low, and the seal cracks when stressed.
Insufficient heat seal strength affects the packaging sealing and causes leakage in food packaging films.
원인 분석
（1）The heat seal temperature is too low and the melting is insufficient
（2）The heat seal pressure is insufficient or the time is not enough
（3）The film thickness is uneven and the heat seal area is thin
（4）The film surface is contaminated or additives have precipitated
（5）The heat seal material is improperly selected
해결 방법
（1）Adjust the heat seal temperature according to the melting point of the polyolefin plastomer, generally 10-20°C higher than the melting point
（2）Increase the heat seal pressure to 0.2-0.4MPa and the heat seal time to 0.5-2s
（3）Ensure uniform film thickness, especially at the heat seal position
（4）Control the amount of additives to avoid surface precipitation affecting heat sealing
（5）Use heat seal layer materials (such as LDPE, EVA, etc.) when necessary
핵심 요약
Insufficient heat seal strength is caused by improper temperature, pressure, or time settings, and the heat seal process parameters need to be optimized.
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