Effects of Moisture and Transfer Pressure on Surface Finish and Shrinkage of 52-20-30 Diallyl Phthalate.

摘要

Perform pills of 52-20-30glass-filled diallyl phthalate (DAP) were conditioned to achieve desired moisture levels. The pills were then transfer-molded at various pressures to determine the effects of moisture content and transfer pressures on material shrinkage and surface roughness. Analyses disclosed that moisture acted as a propellant,causing the material to pack to a greater density. The shrinkage decreased and warp was improved with increased transfer pressure or moisture content. The best surface finish was achieved adjacent to the gate. The interaction term of moisture and transfer pressure was not as significant as expected,appearing only in shrinkage,lack of compaction,and end curl. (ERA citation 02:007642)