Injection Molding
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HDPE injection molded product melt temperature unevenness
Problem Phenomenon
Some areas of the same-mold products have inconsistent gloss and shrinkage.
Cause Analysis
Uneven plasticization and large melt temperature difference; insufficient back pressure or poor screw mixing ability.
Solution
①Increase back pressure; ②check the screw mixing section; ③stabilize the melt temperature curve; ④replace with a mixing-type screw if necessary.
Key Takeaway
Melt uniformity relies on back pressure and screw mixing.
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