Shanghai Daoqin Plastics Co., Ltd.

injection electrical powder application process, can its property can features control, for improve/increase made formed product rate; decrease light injection machine as negative 荷; decrease/reduce for screw material abrasion loss; shrink short molding cycle; improvement made parts appearance has very large 帮助. combined use injection electrical powder can make generally nitrogen screw use lifespan long 至8—12 month, improvement for injection molding parts mold loss 伤. 一, concept: material must in temperature degree conditions lower screw in material inner separation melt 塑化, make it 呈现良 good melt and flow property, make tool most injection molding parts molding process. injection type electrical powder tool has good material heat stabilized property, 120℃ conditions lower material inner can maintain 10 separation above, in 85—100℃时呈现 most melt flow 状态, material maintain time can 达20 separation 钟. 二, material temperature degree conditions: 1． 两段控 temperature material 筒: front 90—95℃, rear 75—85℃; 2． 三段控 temperature material 筒: front 90—100℃, in 80—90℃, rear 70—80℃; 3． according to combined process need material flow property can use improve/increase or reduce front material temperature degree method adjustment. 三, back pressure 关系: injection electrical powder is basic pellets 状, remove temperature degree combined make melt outer must adjustment back pressure formed and 完善材 material 预塑化, make injection process in flow property good, add amount uniform stability. back pressure adjustment generally can control in add material 松退时 nozzle has material 流出, and injection process in adjustment add material stability, different machine large in 3—5㎏/㎝2四, pressure and injection （射 material ） speed degree: due to material separation melt flow property good, very high injection pressure can type 腔, can large degree reduce decrease light machine negative 荷, generally in 60㎏ left right can meet/satisfy injection molding parts molding requirements. material and nozzle, runner, gate, injection molding parts mold fast speed scratch generate high temperature degree and add for screw material abrasion loss. especially is mono ratio/proportion control injection machine, high pressure high speed for screw injection molding parts mold and other loss more is heavy, therefore material speed degree 不宜太 fast. slow effect/influence efficiency, can 取. generally made parts large small and gate 形式, control in 每秒10—25克. generate made parts hard and gas 体顶住而注不 to is good. 五, injection molding parts mold temperature degree and type time: injection electrical powder has relatively fast molding speed degree, in 170℃ conditions lower can meet/satisfy it molding requirements. type time mm 14秒并随 thick degree increase, time increase amount decrease. generally made parts cycle in 60—80秒. upper conditions according to machine 床, injection molding parts mold, runner gate and made parts 形状, thick degree and other conditions adjustment. injection electrical powder batch and large amount stability property more can use use. Shanghai plastics has company