Thermoforming
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PP '2079851475616104458 Cold Mark
Problem Phenomenon
Cold marks from poor mold contact appear on the part surface.
Cause Analysis
Insufficient sheet temperature or too low mold temperature causes local premature cooling, preventing conformity to the mold surface.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Raise sheet heating temperature; ②control mold temperature; ③optimize forming sequence; ④check vacuum hole distribution.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Cold marks are surface evidence of improper temperature management; both sheet and mold temperatures must be within the window.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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