Molding Process
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Sink marks of PAR optical lenses
Problem Phenomenon
The center of thick-walled optical lenses shrinks severely.
Cause Analysis
The center of the thick wall cools slowly, and the holding pressure shrinkage compensation is insufficient, producing a central sink.
Solution
Extend the holding pressure; strengthen cooling in the central area; use staged holding pressure.
Key Takeaway
PAR lens shrinkage is a source of optical distortion.
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