Extrusion & Post
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Floating fibers of glass fiber reinforced PPO
Problem Phenomenon
Glass fibers are exposed on the surface of PPO+GF products; floating fibers are obvious at the far end of the gate and near weld lines, and the rough appearance affects coating.
Cause Analysis
When the injection speed is too fast, the glass fibers impact the cavity surface, causing roughness; poor mold venting enriches fibers on the surface; low melt temperature has insufficient covering ability; 40% high fiber content aggravates the flow difference.
Solution
①Adjust the injection speed to the medium-high speed range to avoid being too fast; ②improve the mold venting design; ③increase the melt temperature to enhance covering; ④optimize the gate position to reduce high-shear impact areas.
Key Takeaway
For floating fiber treatment of PPO high-fiber reinforcement, speed is the key variable; both too fast and too slow cause problems; venting and temperature must cooperate to obtain a uniform surface.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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