Injection Molding
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PARA Surface Glass Fiber Visible
Problem Phenomenon
Glass fiber texture is obvious on PARA product surfaces with uneven gloss; under 50~60% high fiber content, appearance and high strength are hard to achieve simultaneously.
Cause Analysis
Too-low injection temperature and too-low mold temperature make glass-fiber-containing material condense too fast on the mold surface so glass fibers are no longer embedded in the melt; where two melt fronts meet, glass fiber orientation crosses to form a joint line; incomplete mixing of the melt aggravates it.
Solution
①Increase injection speed using multi-stage injection slow-fast; ②Increase mold temperature and barrel temperature; ③Increase screw back pressure to improve mixing; ④Enlarge the gate size.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Surface management of PARA high fiber content is a combination of temperature, speed and gate; joint lines are high-incidence areas of glass fiber defects; mixing uniformity affects surface consistency.
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