Material Drying
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HDPE '2079851475616104457 parison streaks
Problem Phenomenon
Longitudinal light-colored streaks appear on the parison, and the product surface gloss is uneven.
Cause Analysis
Excessive extrusion pressure/back pressure, high regrind ratio, raw material moisture or drying system abnormality, temperature control drift.
Solution
①Reduce extrusion pressure/back pressure; ②reduce the regrind ratio; ③test raw material moisture and the drying system; ④check the temperature controller.
Key Takeaway
Streaks are investigated along three lines: pressure, regrind, and moisture.
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