Shanghai Daoqin Plastics Co., Ltd.

剪切 in made orientation injection molding parts molding is through gate will pressure add to melt, make mold cavity inner polymer melt generate 振动剪切 flow, in its function lower different melt in separation or fiber generate orientation 并冻结 in made parts in, from control products internal structure and micro 形态, to control products force property can and appearance quality 目. will 振动引入 mold cavity methods has screw and plant/unit add types. 1） screw add screw add 振 工 as principle is to injection provide 脉动油 pressure, make injection screw generate 往复移动而 achieve 振动, injection screw generate as used for melt, through polymer 馆体 振动传入 mold cavity, from make mold cavity in melt generate 振动, this type of function sustainable to injection molding parts mold 绕口封闭. types plant/unit comparison simple, can utilizing injection molding parts machine control system, or for injection molding parts machine liquid pressure and electrical control system add renovation achieve. 2）辅助 plant/unit add 振, plant/unit add is will add plant/unit in injection molding parts mold and injection molding parts machine nozzle between, injection stage/phase and injection molding parts 一样, usually melt through gate, gate active rear maintain runner 通畅, active 塞则切断另一 runner; mold cavity rear, holding pressure active in liquid pressure system lower 开始以同样 frequency rate 振动, its versus 位差180O. through active 塞 往复运动, 振动传入 mold cavity, make mold cavity in melt cooling, generate 振动剪切 flow. 实验证明 this type of process has 助于消 remove products Common defect （如 shrink 孔, cracks, surface and other ）, improve/increase weld lines strong/high degree; utilizing control orientation molding technology, through combined 理设置 gate and amount, can control separation or fiber orientation, obtain ratio injection molding parts molding products strong/high degree more high products. control orientation injection molding parts molding process in polymer melt by mold cavity rear, mold cavity inner 开始出现 solid 化层. due to solid 化层附近 speed degree degree most large, melt to strong/high 烈 剪切 function, orientation degree most large. in 心层附近 speed degree degree small, function small, orientation degree small. in holding pressure process in 引入振动, make mold cavity in polymer melt cooling, 一边受振动 剪切 function, 振动剪切 generate orientation injection molding parts mold cooling function formed thick degree orientation 层. has function versus ratio, 振动剪切 flow generate orientation thick degree large 于普通 injection tool has orientation thick degree, this is mold cavity inner 引入振动剪切 flow can make products force property can to improve/increase causes. in addition, due to generate cycle property pressure shrink increase pressure and pressure function, can in thin separation generate relatively large inner hot, this separation cooling, from make thick separation shrinkage can from gate to 足够 补充, has anti shrink 孔, and other defect.