Extrusion & Post
4 조회수
Uneven Thickness of High-Density Polyethylene Cast Film
문제 현상
The transverse thickness deviation of the cast film is large, exceeding the tolerance range.
Uneven thickness affects the film winding quality and subsequent processing, and affects service performance in precision films.
원인 분석
（1）The lip gap of the T-die is uneven
（2）The die temperature distribution is uneven
（3）The air knife airflow is uneven
（4）The cooling roller temperature is uneven
（5）The extrusion output fluctuates
해결 방법
（1）Adjust the T-die lip gap and check the uniformity with a feeler gauge
（2）Check the die heater distribution to ensure the transverse temperature difference does not exceed ±3°C (180-260°C range)
（3）Check the air knife to ensure uniform air outlet, and clean the air knife opening
（4）Check the cooling roller temperature uniformity, with the temperature difference not exceeding ±2°C
（5）Stabilize the extruder screw rotation speed and temperature
핵심 요약
Uneven cast film thickness is caused by uneven die gap or temperature, and needs to be solved from mold precision and temperature uniformity.
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