Material Analysis
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PC sprue material cleanliness management
Problem Phenomenon
After using regrind, product black specks increase and impact performance fluctuates, customer inspection fails
Cause Analysis
Sprue material is cross-contaminated with oil, dust and other materials, and heat history causes molecular weight to decline successively; contaminated particles manifest as black specks and flow marks on transparent and light-colored parts
Solution
①Sprue material dedicated area and dedicated use, immediate crushing and sealing; ②Prohibit mixing oily material and floor-dropped material; ③Transparent parts and food-grade parts restrict or prohibit regrind；After adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The value of regrind depends on cleanliness and heat history control; transparent and high-requirement parts should keep regrind out；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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