Material Drying
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PC Transparent Part Haze Exceeding Standard
Problem Phenomenon
Transparent PC parts become hazy, light transmittance decreases, as if covered by a layer of gauze, optical and appearance parts are unqualified.
Cause Analysis
Raw material moisture degradation, shear overheating, mold surface contamination or poor polishing all reduce transparency; slight crystallization caused by abnormal local thermal history also causes haze areas; multiple factors often superimpose.
Solution
①Strictly dry and verify moisture content; ②Control melt temperature and shear heat; ③Mirror-polish the cavity and clean it regularly; ④Check hot runner temperature uniformity; ⑤Stabilize the process to avoid local overheating.
Key Takeaway
PC haze = a comprehensive examination of 'moisture, thermal history, mold surface': losing control of any one causes haze; transparent parts must manage the three lines of drying, temperature control, and polishing at the same time.
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