Material Drying
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Product cracks during subsequent use or storage
Problem Phenomenon
The product cracks during subsequent use or storage, cracks mostly appear at stress concentration sites (gate, weld line, corners)
Cause Analysis
Injection residual stress too large, not eliminated
Demolding force too large, causing microcracks
Cellulose acetate butyrate absorbs moisture, internal expansion stress superimposed
Stress concentration at the gate area
Unreasonable product design, corners without rounded transitions
Solution
Annealing treatment to eliminate residual stress
Optimize demolding to reduce damage
Control moisture absorption environment and storage temperature
Optimize the gate to reduce stress concentration
Design rounded corners R≥0.5mm, avoid sharp corners
Key Takeaway
Internal stress cracking requires eliminating residual stress and optimizing design
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