Description

When poly(ethylene terephthalate) (PET) is used for molding preforms for bottles and containers, its molecular weight, as indicated by intrinsic viscosity, is of primary importance. Maintaining a relatively high viscosity. is required for producing high-quality bottles. Typically, the preform should have an viscosity. of approximately 0.*9 dL/g or greater to prevent problems such as haze, thin bottle sidewalls, or brittleness. PET is very hygroscopic, and since moisture adversely affects the viscosity. during melt processing of the polymer, it must be dried prior to molding. In the drying process, we include the auto-loading system, the drying tower, heat ex-changers, air flow meters etc. With complete automatic and reliable for continusly feeding the dryed and high vescocity PET pellets & flakes into the extruder, the injection or blow molding machine for further process.