Semi-crystalline polymers compression molding for closure cap of PET bottles, involves feeding melted and cooled polymer into compression molding machine while setting temperature close to crystallization temperature

摘要

The polymer is heated above its melting point (Tf) and cooled to a temperature higher than its crystallization temperature (Tc). The article is formed by feeding the cooled material into compression molding machine (4) while maintaining a temperature close to crystallization temperature (Tc). The article is then cooled and extracted from the mold.