Molds & Tooling
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COC Thick-walled Optical Part Long Molding Cycle
Problem Phenomenon
The cooling time of COC thick-walled optical parts is as long as several minutes, the productivity is low, and shortening the cooling causes shrinkage deformation and internal stress cracks.
Cause Analysis
Thick-walled amorphous materials conduct heat slowly, and the core heat takes time to dissipate; early ejection causes the core to continue shrinking and deforming; the high mold temperature process further prolongs the time to reach demolding stiffness.
Solution
①Optimize the cooling water channels close to the thick-walled area; ②adopt variable mold temperature technology, high mold temperature during filling and rapid cooling during cooling; ③hollow out and thin the structure; ④evaluate annealing to replace part of in-mold cooling.
Key Takeaway
The cycle contradiction of COC thick-walled parts is resolved by variable mold temperature and structural design; the cost of blindly shortening cooling is deformation and cracking; cycle optimization should first calculate the heat balance.
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