Extrusion & Post
3 Aufrufe
Metallocene linear low density polyethylene blown film uneven thickness
Problembeschreibung
The film thickness fluctuates greatly in the circumferential or longitudinal direction, with thickness deviation exceeding ±10%.
Uneven thickness affects film mechanical properties and service performance, and may cause tracking deviation or film breakage on automatic packaging machines.
Ursachenanalyse
（1） Die gap is uneven\
（2） Die circumferential temperature is uneven\
（3） Air ring cooling is uneven\
（4） Extrusion output fluctuates\
（5） Haul-off speed is unstable
Lösung
（1） Adjust the die gap, circumferential error not exceeding ±0.01mm\
（2） Check the die heater bands, ensure circumferential temperature difference does not exceed ±3°C （190-260°C range）\
（3） Check the air ring, ensure uniform air outlet, clean the air ring regularly\
（4） Stabilize the extruder screw speed and temperature\
（5） Stabilize the haul-off speed, use a high-precision haul-off control system
Wichtigste Erkenntnis
Film thickness unevenness is caused by die gap, temperature or cooling unevenness, and needs to be solved from mold precision and process stability.
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