Shanghai Daoqin Plastics Co., Ltd.

1. machine 械原则
　　 extrusion basic mechanism very simple ——一 螺杆 in in 转动并 plastics toward front 推动. screw upper is 一 斜面 or 者斜坡, in in upper. its is increase pressure 以便克服 relatively large retardant force. 就一台 extrusion machine 而言, has 3 types retardant force need 克服: solid pellets （进 material ） for 筒壁 摩 scratch force and screw front 几圈时（进 material 区） it between versus scratch force; melt in upper force; melt by toward front 推动时 its internal material retardant force.
　　 more mono screw is right 旋螺纹, 像木工 and machine in use screw and 螺栓. if from rear 面看, it is toward 转动, is it need force toward rear 旋出筒体. in di screw extrusion machine in, screw in 两 筒体 in toward 转动并 versus 互交叉, therefore 一 必 must is right toward, 另一 必 must is left toward. in its it combined di screw in, screw same direction 转动因而必 must has same orientation. however, tube/pipe is types 情况都 has absorption toward rear force bearings, 牛顿 principle suitable.
　　2. hot 原则
　　 can extrusion plastics is hot plastics —— it in add hot 时熔化并 in cooling again solid. plastics hot amount from 何而? material preheating and 筒体/ mold add hot device can can function but also in 启动时 non important, is, electrical machine can amount —— electrical machine viscous melt retardant force screw formed 于筒体 inner scratch hot amount —— is has plastics most important hot 源, small system, low speed screw, high melt temperature degree plastics and extrusion coating application remove outer.
　　 for/regarding has other as, to add hot device is as in main/primary hot is very important, for extrusion function ratio expected can can need small （见第11 strip/profile 原则）. rear temperature degree can can important, is it effect/influence combined or material in solid material speed degree. and mold temperature degree usually is need melt temperature degree or 者接近于 this temperature degree, remove non it used for certain specific 目 像 upper light, separation or pressure control.
　　3. decrease speed 原则
　　 in more extrusion machine in, screw speed degree through adjustment electrical machine speed degree achieve. electrical machine usually large 约1750rpm full speed 转动, is this for extrusion machine screw fast. if 以如此 fast speed degree 转动, generate more scratch hot amount but also plastics time short can made uniform, very good melt. type decrease speed ratio rate in 10: 1 to 20: 1 between. stage/phase can use gears can slip 轮组, is stage/phase use gears but also screw in most rear large gears in 心. 　　 has decrease speed rate and 任务匹配 has 误——会 has more can amount can use —— but also has can can in electrical machine and most large speed degree decrease speed stage/phase between increase slip 轮组. this need make screw speed degree increase to ultra- 先 front or reduce most large speed degree 允许该 system most large speed degree more large percentage 运行. this will increase can obtain can amount, decrease/reduce 安培数并避免 electrical machine issues. in types in, according to material and its cooling need, can can increase.
　　4.进 material cooling agent
　　 extrusion is electrical machine can amount —— has is add hot device ——传送 to cold plastics upper, from it from solid 体转换 formed melt. 输入进 material ratio to material in and screw table/sheet 面 temperature degree low. 　　 screw surface by material cooling by plastics material pellets （ and pellets between gas ） from upper hot. if screw 突然停止, material 也停止, and is hot amount from more hot front toward rear 移动, screw surface in material more hot. this can can pellets in viscous or 搭桥.
　　5. in material inner, viscous to upper slip to screw upper
　　 is make mono screw extrusion machine light slip 筒体进 material solid pellets amount to most large, pellets viscous in upper slip to screw upper. if pellets viscous in screw 根部, has what can it lower; 通道体积 and solid 体 入口 amount decrease/reduce. in viscous good causes is plastics can can in hot generate and similar pellets, or 者随输出 speed degree 变化间歇 viscous in 断.
　　 more plastics very in sliding, is it 们进入时 is cold, but also scratch force also has add hot to and 筒壁一样 hot. 一 材 material ratio 另一 材 material more can can viscous 附: high degree 塑化PVC, non 晶体PET, and certain most use in need has viscous features poly 烯烃 type polymer.
　　 belt/tape 槽筒体 is types 特殊情况. in material 区, material and its separation is hot insulation is deep degree water cold. pellets 推入槽 inner in versus short inner formed very high pressure. this increase same relatively low screw speed combined amount, from front generate scratch hot amount decrease/reduce, melt temperature degree more low. this can can cooling made made film production in more fast production. especially combined 于HDPE, it is remove fluorine plastics outer most slip plastics.
　　6.材 material most large
　　 in certain lower, material cost can to cost 80%—— more other has factors and —— remove less quality and 包装 especially important product ratio medical grade tube/pipe. this 原则自然引出两 结论: processing 商应该尽 can can more heavy use material and waste product Raw Materials, can can 严格 遵守容差以免背离 target/goal thick degree and product issues.
　　7. can cost versus for 说并不 important
　　尽 tube/pipe factory force and true positive issues and upper rise can cost in water upper, 运行一台 extrusion machine can still is production cost in very less separation. 情况总 is this 样 因 is material cost non high, extrusion machine is has system, if more can amount that plastics very fast non hot 以致于无 method positive 常 processing .
　　8. screw pressure very important
　　 this pressure screw lower has material retardant force: and 污染扎碎 machine sheet/plate, device tube/pipe, solid 定搅拌 device （ if has ）以 and mold 自身. it 不但依赖于 this parts 几何图形 also 依赖于 system in temperature degree, this also effect/influence resin viscosity and through speed degree. it 不依赖于 screw design, it effect/influence temperature degree, viscosity and through amount remove outer. safety causes 说, amount temperature degree is very important —— if it high, and mold can can 爆炸并伤害附近人员 or machine.
　　 in manufacturing 空心部 parts 时, ratio use for core 定位 蜘蛛 mold manufacturing tube/pipe 子, must in mold inner generate very high pressure separation material heavy new combined. 否则, welding product can can relatively low and in use can can issues.
　　9.输出= most rear 一 螺纹 位移+/- pressure material and 泄漏
　　 most rear 一 螺纹 位移叫做 positive 流, 依赖于 screw 几何形状, screw speed degree and melt density. it pressure material adjustment, upper decrease/reduce amount retardant force 效果（由 most high pressure table/sheet 示） and increase amount material in 任何 咬 combined 效果. upper can can is direction in 任意一 direction.
　　10.剪切 rate in viscosity in main/primary function
　　 has 普通 plastics 都 has force decline features, is in plastics 运动 越 越 fast viscosity low. plastics this table/sheet especially obvious. 例如一 PVCs in force increase 一倍时流 speed increase 10倍 or more more. melt is viscosity commonly used amount methods is 颠倒 （ ratio is amount /推 force is force /流 amount ）. can 惜, its amount is in rate in 10s-1 or more small but also in melt speed very fast extrusion machine in can can is true 实 测 amount value. electrical machine and for 立, and electrical machine for 立: is what control 效果并 non is and 期望 一样, especially is in amount inner? if for add hot, 筒壁处 材 material viscosity small, electrical machine in this more add light slip inner need can amount more less. electrical machine electrical 流（安培数） decline. versus 反, if cooling, 筒壁处 melt viscosity increase large, electrical machine must more add use force 转动, 安培数 increase.