Shanghai Daoqin Plastics Co., Ltd.

        PVC is hot property material, its injection molding process property relatively 差, causes is high temperature degree or long hot time very easy make PVC separation understanding, therefore control melt temperature degree is injection molding PVC product key/critical. 熔化PVC raw materials hot 源 自两方面即 screw generate for plastics hot and machine outer electrical retardant filament add hot, main/primary is screw 运动 剪切 hot, machine outer add hot main/primary is machine 起动时 provide hot 源.

         product design and mold design upper attention/notes below/following 几点:

        1. product amount need has or 突变, thick degree force 求变化不 large, anti 止出现PVC understanding drop 变质.

        2. mold has 10 degree above 拔模斜 degree, 预留约0.5% shrinkage amount.

        3. mold runner design attention/notes 几点

         mold injection ratio 射咀孔略 large, ratio runner 交错处直径 large, make PVC material mold cavity 不滞留 and pressure balanced.

        尽 amount using/adopting gate, make 熔渣不会流入 product and runner in temperature degree reduce, easy molding.

         gate design in product most thick 壁处, degree 足够, long degree most good in 6—8mm between, make PVC material 流入畅顺.

         is active pressure decline and easy demolding, runner most good is 圆形, product large small and weight in 6—10mm间 selection.

        4. mold temperature degree has cooling water control plant/unit, make mold temperature can in 30℃~60℃ between can 控.

        5. mold surface light 洁, anti 腐蚀.

         due to PVC property can 特殊, therefore selection specialized PVC injection molding machine production, its in need attention/notes below/following 几点:

        1. screw long ratio is 20: 1 relatively good, pressure shrink ratio in 1: 1.6-1: 1.2 between.

        2. screw and 射咀应 is is PVC manufacturing, surface 镀铬.

        3. injection pressure, speed degree, back pressure, temperature degree can more grade, precision control.

         in raw materials upper attention/notes below/following requirements:

        1. must has other plastics PVC raw materials in, 引起PVC raw materials 变质. especially is injection molding other raw materials 时, need 先清洗 dry machine and screw inner plastics, can injection molding PVC product. (use PE\PP\PS material screw, machine 筒)

        2. machine front need will PVC material full 打净, long time machine, is anti 止PVC腐蚀 machine, application material dry screw, machine 筒.

        3. 当PVC material time ultra- 6 month, ring high temperature, wet, use front application 60-80℃ temperature degree dry 2-5 small can use.