Shanghai Daoqin Plastics Co., Ltd.

         technology field/area

        本发明涉 and types screw injection molding plant/unit. 本发明 due to in screw upper add 装 子 screw, 而位于母 screw front 端 子 screw used for most rear stage/phase increase injection pressure and holding pressure pressure, can in large amount lower meanwhile to high pressure or ultra-high injection pressure, large large improve/increase product quality, improve/increase injection amount, shrink short add material and processing time, improve/increase production efficiency, use electrical, decrease/reduce screw material abrasion loss degree.

        背景 technology

        传统 injection molding machine in injection process in, mold cavity is 空, injection pressure value need very low, injection to 60%-80%时 injection pressure need slow slow rise high, to most rear 3%-10%时 need very high injection pressure, this most rear 一点点也 is most difficult injection, this is in production process in most easy 发生缺 material, shrink and other product defect stage/phase, injection molding machine in injection molding thick plastics product and local thick plastics product 时,当 plastics mold cavity rear is in mold 两边先 cooling solid 化,然 rear in again slow slow cooling solid 化, due to plastics shrinkage rate comparison large, in cooling generate strong/high large force, therefore generate types 结果:一 types surface lower (简称 shrink 印) effect/influence appearance,另一 types is in 间出现空洞 reduce density strong/high degree, injection molding machine injection most high injection pressure is 恒定, for different plastics raw materials and color color plastics product method to for meet/satisfy types product demand, therefore injection molding machine production in injection molding machine 接受订货时 provide 三至四 types large small different screw to use selection, versus 当一部 separation quality and appearance still 然不够理想, injection pressure and amount is injection molding machine non important indicators, injection pressure to product quality, can can combined product, amount to can processing more large product to use belt/tape 经济效益, if selection large screw amount is large, injection pressure small, selection small screw injection pressure large 但射胶 amount small, comparison difficult selection, use generally selection in large small screw 兼顾两头, injection amount very large, injection pressure very high. use in need more debugging can to relatively use 效果, separation 麻烦. for/regarding modified engineering plastics nylon add glass fiber, polystyrene (PS) add carbon acid this material for screw material abrasion loss non large, has several month need sleeve/set screw material 筒, non 常麻烦 cost high.

        本发明目 is provide types screw injection molding plant/unit, can in ensure injection molding amount meanwhile also can ensure relatively high injection pressure, make product formed product rate large large improve/increase, but also large large reduce for screw material abrasion loss, shrink short processing time, has can make need in large Model/Grade injection molding machine upper processing product can in small Model/Grade injection molding machine upper processing, cost use 方便.

        发明 inner 容:

         injection molding machine according to product large small add versus raw materials, add material rear, injection, screw toward front 运动, screw upper 母止逆 ring and screw upper 子止逆 ring slip toward rear 端并闭 combined screw upper material 通道, plastics in screw lower from front material nozzle mold, mold cavity injection pressure use high, plastics fast mold cavity injection pressure slow slow rise high, injection to most rear stage/phase 时, screw 头进入 front material meanwhile 母止逆 ring rear 端移动 to 回流槽 通道口(A点 is screw and screw as 转换点), plastics from 回流槽绕 母 screw ring to its rear 端, screw front pressure, 此时子 screw in front material in function, screw 头 端部面积 can ratio screw 头 端部面积 small very more (according to need 端部面积 can to small 达几倍, versus generate pressure can is screw generate pressure 几倍, generally mold cavity pressure is 250～300cm²/kg), therefore mold cavity pressure is high pressure, can is ultra-high pressure 每平方 cm in 一千公斤 above, can meet/satisfy plastics product requirements (use gas 体辅助 injection equipment most high can to 每平方 cm 700公斤), active adjustment injection molding machine electrical control most rear injection and grade grade holding pressure pressure, processing plastics product can to shrink 印, high quality, high density, high strength.

         application 场景

        1. combined LED灯 sheet/slice, 透镜, 球阀阀芯, PVC,PE pipe fittings this thick product non has 效

        2. automotive, home appliances and complex engineering plastics machine parts has and 柱子, this easy generate shrink 印.

        3. type and runner comparison deep long product, injection to most rear plastics difficult to product,

        4. 像PP,PE this flow property comparison good product need clamping force 够, can add large screw production ratio heavy more product.

        5. 像PC and other high viscosity plastics need add long 一点子 screw long degree processing 起 也 very light 松.

        6. 一 回 material has very more or add carbon acid 钙, screw material comparison easy abrasion loss, need screw add large design formed add material screw, screw design formed injection screw 如图7, large large decrease/reduce screw abrasion loss

        7. injection machine in injection to most rear stage/phase and holding pressure stage/phase is injection molding machine in production process in use electrical amount most large stage/phase, if use 本发明此 stage/phase can large large reduce use electrical amount, meanwhile can decrease/reduce machine negative 载, therefore 本发明几乎 can used for 任何形式 injection molding machine.