Extrusion & Post
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PC and ABS Material Change Cross-Contamination
Problem Phenomenon
After changing from PC to ABS or the reverse, delamination, black specks, and silver streaks appear and cannot be cleaned for a long time.
Cause Analysis
The two materials differ in processing temperature and compatibility, and uncleaned residual material causes cross-contamination; PC high-temperature residue carbonizes under ABS processing conditions, and ABS residue affects PC transparency.
Solution
①Use intermediate-temperature purging material for gradient replacement during material change; ②Disassemble and clean the nozzle and hot runner; ③Record and execute the material change cleaning SOP; ④Avoid frequent cross material changes; ⑤Fully inspect the first article after material change to confirm thorough replacement.
Key Takeaway
PC/ABS material change 'cross-contamination' is prevented by SOP: gradient temperature cleaning + disassembling and cleaning dead corners are standard actions; frequent cross material changes are the enemy of quality, use a dedicated line if possible.
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