Shanghai Daoqin Plastics Co., Ltd.

injection molding screw in add material generate pressure material difficult 时, anti 止 plastics injection molding screw slip methods or machine long degree can formed viscous force 以输送 material material, that screw 就发生 打 slip phenomenon. in screw stage/phase, screw in machine inner 旋转沿 screw direction material material rear 退积累 material material lower one-time injection molding 时, screw 也会发生打 slip. if screw in stage/phase 开始打 slip, that in screw 继续旋转时, screw toward 运动会停止. usually screw slip 会导致 material material in injection molding front degradation, also 会出现 short 射, processing ring cycle long and other products quality issues.

screw 出现打 slip causes back pressure high, machine rear semi hot or cold, machine or screw abrasion loss, screw add material 段螺槽太 shallow, material design 不当, material material or 堵塞, resin wet, resin in lubricant content high, material material degree fine, use resin 切割形状不佳 or is recycled material.

process parameters effect/influence

machine rear temperature degree low usually is formed injection molding screw slip main/primary causes. injection molding machine machine separation is 三段, in add material rear 部, material material in add hot pressure shrink process in formed 一层熔 melt polymer thin 层. melt film in machine upper. if has this thin 层, material very difficult toward front 输送.

处于 add material inner material material must add hot to temperature degree, can generate key/critical melt film 层. however is material material in machine in time short can make polymer to temperature degree. this type of 情况 发生 can can is due to equipment 规模太 small, versus 应配置 relatively small machine and screw formed. time short easy formed polymer melt or mixed combined separation, from 而会导致 screw slip or 停转.

现 in introduction 出现该 issues simple methods. from machine 筒末端开始 add a small amount of material material 进行清洗, and 检?熔 melt temperature degree. if time short, that melt temperature degree low machine temperature degree setting value. types methods is molding products, if has large 理石斑纹, black spots or strip/profile 纹, that table/sheet material material in machine inner has to very good mixing/compounding.

出现 screw slip solution methods is, improves add material temperature degree, to screw and rear to 协调一致. has 时不 不 will machine temperature degree improve/increase to recommendation setting value above can to this scope/range.

设置 high back pressure 也会导致 screw or slip. improve/increase back pressure setting value improve/increase to material material in can amount. if back pressure setting high, that screw 也许不 can generate toward front melt pressure, 以克服 back pressure pressure, screw in certain 位置旋转不会 rear 退, this for melt more more significantly improve/increase melt temperature degree, from for products quality and ring cycle generate effect/influence. add in melt upper back pressure can through injection machine upper control 阀进行 adjustment.

equipment effect/influence

if screw slip causes is due to processing equipment is process parameters 引起, that screw and machine abrasion loss very has can can is issues key/critical. and add material 段一样, resin in screw pressure shrink 段熔化时 viscous in machine upper. screw 进行旋转时, material material to force rear machine 筒壁并 toward front 方输送. if screw and machine upper has abrasion loss 区, that screw can has toward front material material. if equipment in has abrasion loss, 就应该检查 screw and machine 筒, 并检验两者 between combined 间隙. if screw and machine 筒 配 combined ultra- standards value, 应该 手 more or repair as.

screw design parameters especially is pressure shrink ratio （ add material deep degree ratio 均化段 deep degree ） for uniform property to important function. add material shallow (to relatively small pressure shrink ratio)会 reduce output/production volume 并会因喂 material 不足而造 formed screw slip. various resin supply generally has recommendation injection molding material material most pressure shrink ratio.

止逆 ring （ mono toward 阀）发生 fault/failure 也会导致 screw slip. screw in 旋转并进行塑化

material material 时,止逆 ring 应该处于 front 面(打开)位置, solid ring base/seat. if ring is toward rear (闭 combined)状态, or toward front and toward rear between 状态, melt polymer in through ring and ring base/seat between 缺口时会 has retardant force. if 怀疑止逆 ring has issues 应立即 replace.

resin material 斗也会 is formed multiple injection molding screw slip causes in. positive material design is ensure can stability material material key/critical, this 点经常 by 忽略. usually 说, large small uniform new material in has pressure shrink 区 方 type material 斗(底部突然变 narrow ） in 运行良 good. however, add recycled material material 时就不 is this type of 情况. again powder material and large small very 不一致, this effect/influence to material uniform property. material 不连贯意味 screw can maintain melt upper uniform pressure, generate slip. need solution this issues, solution recycled material and new material dimensions large small issues, can use and has pressure shrink 区（底部呈平缓梯 degree 状） 圆形 material 斗.

材 material uniform property

positive upper 述 说, material material pellets and dimensions large small effect/influence material property. material 形状不佳会引起 screw processing properties decline, output/production volume 波动以 and screw slip. uniform material in screw add material can more 紧密 堆积 in 一起. in screw in material is by 紧密 堆积 in 一起, material material has more more time in screw in melt toward front 输送. 形状不佳 粒 material has more large 自由体积（粒 material between relatively low density or more more true 空区）, and material difficult, formed screw 出现打 slip. improve/increase machine rear temperature degree, can make material material more fast 开始熔 melt, melt obtain pressure shrink property more large.

in processing nylon and other wet property material 时, wet 也会导致 screw slip. positive material material drying obvious reduce machine in material viscosity generate water 蒸汽, make screw can force decline. for 此, can in processing front use wet degree analysis 仪 确定 drying rear material material water amount, make material material drying degree to supply recommendation value.