Material Drying
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Decreased Transparency and Haze of PCTG Injection Molded Products
Problem Phenomenon
The transparency of PCTG products decreases, showing a hazy or translucent appearance.
Cause Analysis
Insufficient drying, the moisture does not meet the standard (>0.03%), hydrolysis and bubbles are generated during processing, the processing temperature is too high causing degradation, and the mold roughness is poor.
Solution
Dry at 65-70°C for 4-6h until the moisture is <0.03% with a dew point ≤-40°C; control the processing temperature at 220-250°C; mirror-polish the mold.
Key Takeaway
The basis of PCTG transparency lies in sufficient drying and temperature control.
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