Material Drying
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PE '2079851475616104457 Parison Die Lines and Streaks
Problem Phenomenon
Longitudinal line marks or light-colored streaks appear on the parison surface, still clearly visible after '2079851475616104457, affecting the container appearance.
Cause Analysis
Foreign matter or degraded material caught between the die and mandrel causes die lines; excessive extrusion pressure/back pressure, high regrind ratio, raw material moisture or temperature control drift cause streaks; die damage and carbonized buildup also produce streaks.
Solution
①Clean foreign matter and buildup from the die, and check and polish die damage; ②adjust the extrusion pressure and back pressure; ③reduce the regrind ratio; ④test the raw material moisture and the drying system; ⑤calibrate the temperature controller and heater bands.
Key Takeaway
For line marks and streaks on the parison, first clean the die, then check the pressure and regrind, and finally verify the moisture; parison quality directly determines container quality, and any defect at the parison stage will be amplified after blowing.
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