Material Analysis
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ASA dark part weld line management
Problem Phenomenon
Weld lines and flow marks on ASA black and dark exterior parts have high visibility, customer appearance standards are stringent, and process adjustment space is compressed.
Cause Analysis
Dark formulas have a strong amplification effect on surface microscopic differences; weld lines have high contrast on dark backgrounds; PlastHub explicitly states that dark part weld lines need to be treated by increasing melt temperature and speed.
Solution
①Increase melt temperature and injection speed to strengthen confluence; ②gate layout avoids the main viewing surface; ③mold temperature increase improves surface consistency; ④confirm appearance limit sample standards with the customer.
Key Takeaway
Appearance management of ASA dark parts must be laid out at the mold design stage; when process optimization space is limited, the gate scheme is the radical means; limit sample standards avoid acceptance disputes.
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