It has the properties of heat softening, cooling hardening, and no chemical reaction, no matter how many times the heating and cooling are repeated, can maintain this performance. The molecular structure of a thermoplastic resin is linear. It includes all polymeric resins and partially condensed resins. Thermoplastic resins are: polyethylene, polyvinyl chloride, polystyrene, polyamide, POM, polycarbonate, polyphenylene ether, polysulfone, rubber and so on. The advantage of thermoplastic resin is that it is easy to process and has higher mechanical energy.