Injection Molding
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Poor glass fiber dispersion flow marks of PPO
Problem Phenomenon
PPO+PS+40%GF products show flow marks and uneven glass fiber distribution, with obvious strength anisotropy and locally visible fiber agglomeration.
Cause Analysis
Medium-high speed injection helps uniform glass fiber distribution; too low speed causes disordered fiber orientation and produces flow marks; low melt temperature and high melt viscosity make fiber dispersion difficult; the screw mixing capacity is insufficient.
Solution
①Keep the injection speed at a medium to high level to promote uniform fiber distribution; ②control the melt temperature at 270~290℃ to ensure flowability; ③use appropriate back pressure to improve mixing; ④check the screw wear condition.
Key Takeaway
PPO glass fiber dispersion depends on a reasonable combination of speed and temperature; the mixing requirements of 40% high fiber content cannot be treated as ordinary material; regularly evaluate the screw condition.
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