Extrusion & Post
5 조회수
Uneven thickness of polyolefin plastomer cast films (Variant: Enhanced Measures)
문제 현상
The transverse thickness deviation of the cast film is large, exceeding the tolerance range.
Uneven thickness affects the winding quality of the film and subsequent processing, and affects service performance in precision films.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
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
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
해결 방법
（1）Adjust the lip gap of the T-die, using a feeler gauge to check uniformity
（2）Check the die heater distribution to ensure the transverse temperature difference does not exceed ±3°C (180-230°C range)
（3）Check the air knife to ensure uniform air output, and clean the air knife opening
（4）Check the temperature uniformity of the cooling roller, with the temperature difference not exceeding ±2°C
（5）Stabilize the extruder screw speed and temperature
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
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.
Targeted preventive measures need to be taken in different production scenarios.
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