Study the shrinkage of plastic polyethylene terephthalate (PET) used with make blow mold

Abstract

This research aims to study the shrinkage of plastic polyethylene Terephthalate used with the make blow mold in 2 stages. The shrinkage of work piece was determined in order to design the mold ; Z axis = 1% , X,Y axis = 2.5% . The testing results were as follow. 1. Horizontal shrinkage(Z axis) was 0.85% which differed from the determined shrinkage(1%) at 0.15% 2. Vertical shrinkage(X,Y axis) was 1.83% that is 0.67% which differed from the determined shrinkage(2.5%) at 0.67%