Shanghai Daoqin Plastics Co., Ltd.

         medical grade PP plastics tool has relatively high transparent degree, relatively good retardant property and resistant property, make its in medical equipment and packaging upper tool has application. 以PP plastics is Non-PVC材 material is currently use PVC材 material substitute/replace product.

         medical grade PP plastics features

        PP plastics color, 无味, 无毒. appearance polyethylene (PE), ratio polyethylene (PE) more transparent, more light. PP is types property can excellent thermoplastic property plastics, tool has specific gravity small (0.9g/cm3), 无毒, easy processing, impact resistant, resistant property and other advantages.

         medical grade PP plastics main/primary property can

         high temperature 消毒:

        PP plastics is types semi crystallization property material, melting point high, heat resistant property good, can in 100℃ above temperature degree lower 进行消毒灭菌. strong/high degree, resistant strong/high degree, resistant pressure strong/high degree, hardness and elastic property ratio polyethylene (PE) (PE) need high.

         low temperature resistance, impact resistant:

         homopolymer PP property relatively large, and ethylene combined formed random copolymer PP tool has relatively good tough property and more strong/high impact resistant strong/high degree. usually in low temperature conditions lower use product, need amount selection copolymer PP, or add thermoplastic property methods for PP进行 modified, increase its flexibility property and low temperature resistant impact property can.

        Non-PVC large liquid bag is copolymer PP and elastomer blending modified material made formed.

        不足:

         in oxygen, hot, light function lower easy understanding poly, aging, therefore must add anti aging agent. PP products easy bonding, in bonding front need 处理, need use especially bonding agent, device use ring ketone can meet/satisfy requirements. color property relatively 差, shrinkage rate large (generally is 1.6-2.5%), resistant property 差, easy 火. PP is non property material, for material amount relatively low.

         processing process conditions

         processing process:

         can injection molding, extrusion, blow molding or made formed film. PP film usually using/adopting hot combined methods welding formed bag, its processing process need ratio high frequency welding PVC bag process complex. Non-PVC large liquid bag is use full equipment production, ensure process stability and quality can 靠.

         drying 处理:

        吸 water property low, need drying 处理.

        熔化 temperature degree:

        220-270℃, attention/notes need ultra- 275℃. mold temperature degree: 40-80℃, use 50℃.

         injection pressure:

         can large to 1800bar.

         injection speed degree:

         use high speed injection molding can make internal pressure decrease small to most small. if products surface defect, that use relatively high temperature degree lower low speed injection molding.

         runner and gate:

         for/regarding cold runner, type runner scope/range is 4-7mm. use is 圆形 注入口 and runner. has type type gate can use. type gate scope/range is 1~1.5mm, can use small to 0.7mm gate. for/regarding gate, most small gate deep degree is thick semi; most small gate wide degree less is thick 两倍. PP材 material full can use hot runner system.