Shanghai Daoqin Plastics Co., Ltd.

（1） styrene resin styrene resin is polystyrene (PS), AS resin, ABS resin and other. this category of resin molding temperature degree wide, easy molding. 严谨 讲, general purpose polystyrene (PS) （GPPS） flow property most good, high impact resistance polystyrene (PS) （HIPS） in 含橡胶 formed separation more, flow property 就愈差. ABS resin has similar features. generally must attention/notes to general purpose polystyrene (PS) 质 脆, in demolding 时, easy cracking phenomenon. for/regarding AS resin, ABS resin due to its formed in acrylonitrile formed separation add hot rear easy color. （2） polymethyl methacrylate (PMMA) （ acrylic resin ） polymethyl methacrylate (PMMA) （PMMA） ratio polystyrene (PS) melt viscosity high, its molding property generally ratio polystyrene (PS) 差. in acrylic resin in although has flow property comparison good resin, is, in type resin in, comparison good heat resistant property and impact resistant property grade resin ratio general purpose grade resin molding property 差, need ratio general purpose resin more high processing temperature degree and injection pressure. however, degree improve/increase resin temperature degree 会导致 thermal degradation, 应予以 attention/notes. another, add large injection molding parts mold runner and gate, from improvement resin flow 状态. （3） polycarbonate (PC) polycarbonate (PC) （PC） melt viscosity high, processing need ratio polyethylene (PE), polystyrene (PS) and other general purpose resin more high temperature degree and injection pressure. degree improve/increase material temperature degree and material material in material inner time long, generate thermal degradation, make products color 泽改变 and material 理－ mechanical properties decline, 故需予以 attention/notes. injection molding parts mold temperature degree generally is 85～120℃. although in mold temperature relatively low can molding. mold temperature low 时, due to products and thick different, different degree molding difficult and increase large products residual stress, day rear easy formed is force cracking causes. meanwhile, in use demolding agent 时, is due to residual stress generate cracking, using/adopting powder silicon resin demolding agent, amount using/adopting liquid demolding agent. （4） modified PPO（mPPO）mPPO very more physical properties features similar polycarbonate (PC), its molding property versus 似. mPPO molding resin temperature degree its different grade 而定, generally is 245～300℃. however, in molding cycle especially short 时, temperature degree 则应稍 high 一. injection molding parts mold temperature degree certain temperature degree above 时, already again effect/influence resin flow property. 但因考虑 to products and thick and other, is make residual stress reduce to most low degree, improvement products appearance and improve/increase weld lines strong/high degree, generally mold temperature is 80～100℃ relatively is 理想. （5） hard polyvinyl chloride (PVC) hard polyvinyl chloride (PVC) （HPVC） melt viscosity high, tube/pipe improve/increase its injection pressure and resin temperature degree, flow property 变化不敏感. meanwhile, due to its flow temperature degree and separation understanding temperature degree 接近, molding temperature degree scope/range narrow, molding difficult （图10）. hard polyvinyl chloride (PVC) （未 increase 塑） material temperature degree 约170～190℃ is 宜, force ultra- 200℃, meanwhile, resin in material in time can can short. mold temperature is 50～60℃. can most large degree improve/increase injection pressure. is improvement products appearance, decrease/reduce flow marks （jetting）, using/adopting amount slow injection speed degree, can to good 效果.