Thermoforming
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ABS '2079851475616104458 chill marks
Problem Phenomenon
Shiny cold print lines or foggy spots appear on the surface of the vacuum formed part, corresponding in position to the mold/plug contact area.
Cause Analysis
The hot sheet contacts the too-cold plug or mold surface before the stretching is completed and is quenched in advance, the surface replication is poor and stress marks are left; too low mold/plug temperature is the direct cause.
Solution
①Preheat the mold to 60~80℃; ②heat the plug or change to a low thermal conductivity material; ③slow down the plug descending speed; ④balance the heating zone temperature; ⑤check whether the cooling water circuit is locally too cold.
Key Takeaway
ABS chill marks=the mark of 'touching the cold surface in advance': raising the mold/plug temperature and delaying the contact timing can eliminate them; a typical temperature management problem, unrelated to the material.
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