Blow Molding
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HDPE '2079851475616104457 parison die lines (Die Lines)
Problem Phenomenon
Longitudinal line marks on the parison surface, still visible after '2079851475616104457.
Cause Analysis
Foreign matter or degraded material caught between the die and mandrel; die damage and carbonized buildup also cause streaks.
Solution
①Clean the die of foreign matter and buildup; ②check the die for damage and polish; ③increase resin temperature and back pressure to improve plasticization; ④check raw material contamination.
Key Takeaway
For parison line marks, clean the die first, then check the material.
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