Plastics include:1. Thermoplastic crystalline (1) PE (Polyetylene) Material from PE has good liquid flow, about wide, high-temperature mold temperature. However, this material has a high shrinkage, prone to warping and distortion. (2) PP (Polypropylene) Characteristics of PP plastic near the same as PE. Capable of flowing fluid good and large shrinkage. When molding in low pressure conditions, PP resin material very easy warping and distortion. Need to be careful. (3) PA (Polyamide) (Nylon) Other than these other thermoplastic type, viscosity of PA very sensitive to heat. The melting point of clear and accurate than PA, forming temperature is higher than the other materials. PA is the plastic material having nature. Need drying time long enough. Note that the PA will turn color when dried at temperatures over 90° C.
đang được dịch, vui lòng đợi..