Abstract
In this paper, it is analyzed the characteristics of plastic lens dimensional deviation according to injection mold clamping force. The influences of fill time, mold clamping force, injection pressure, shear rate, etc., are examined. It was found that mold clamping forces which increased 100, 200, 300, 400, 500 kN can affect the thickness deviation of the lens. Dimensional deviation of the lens derived by injection molding was found to be 2.9% at 100 kN and 0.7% at 500 kN, the smallest observed deviation throughout the study. This indicates that mold clamping force and dimensional deviation of lens thickness were inversely proportional to each other. A prediction of filling time was 1.87 sec performed by injection molding analysis, however, filling time was observed at 1.72 sec in the actual experiment, which is 8.0% shorter than expected. This can be attributed to packing pressure.
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