Shanghai Daoqin Plastics Co., Ltd.

几乎 has thermoplastic property plastics in can filling 20％～30％（ quality separation 数） or more more glass fiber made glass fiber reinforced plastics （FRTP or GFTP）, application scope very 广. FRTP injection molding parts molding and its 基材（未 reinforcement ） versus ratio, tool has lower features: （1）FRTP flow property ratio reinforcement resin 差, therefore processing material temperature degree, injection molding parts mold temperature degree, injection pressure and other generally ratio reinforcement resin need high. （2）同样理由, its injection molding parts mold runner, separation runner, inner gate and other dimensions ratio reinforcement resin is large. （3）FRTP products surface easy glass fiber 浮露, surface relatively coarse 糙, use improve/increase injection molding parts mold temperature degree and injection speed degree method, can improvement surface gloss. （4） molding shrinkage obvious reduce reinforcement resin. however, due to glass fiber flow orientation, make molding shrinkage and mechanical properties performance has direction property, therefore its injection molding parts mold design, especially attention/notes can amount decrease/reduce orientation generate defect effect/influence gate type 式. （5） due to products weld lines separation ratio other separation strong/high degree low, in products design and injection molding parts mold design 时, need attention/notes to this 点. also has in weld lines 部位设置空 gas gas 口, make separation resin gas 一道排出. （6） injection molding parts mold 各 部位（ especially is gate 部位）以 and injection molding parts molding machine screw abrasion loss relatively speed, especially injection molding parts mold, screw and surface treatment. most rear, 应指出 is types plastics different grade processing property very large, remove glass fiber reinforced effect/influence processing property outer, lubricant, flame retardant, processing additives, filler and other obvious effect/influence plastics melt flow property. another, polymerization technology 进步, high MFR grade has good material property, 如MFR达40 g/10min PP grade still tool has application requirements rigid property and impact resistant property.