Molds & Tooling
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Improper draft angle design, product sticking to mold or deforming
Problem Phenomenon
Improper draft angle design, product sticking to mold or deforming
Cause Analysis
Draft angle <0.5°, demolding difficult
Deep-cavity products have insufficient draft angle
Textured surfaces require increased draft angle
Cellulose acetate butyrate shrinkage rate 0.4-0.6% needs to be matched with the draft angle
Core and cavity draft angles inconsistent
Solution
Draft angle ≥1° for conventional products
Deep-cavity products draft angle 1.5-3°
Textured surface increase 0.5° per 0.01mm depth
Design the draft angle according to the 0.4-0.6% shrinkage rate
Ensure core and cavity draft angles are consistent
Key Takeaway
Draft angle needs to be designed according to shrinkage rate and product depth
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