Shanghai Daoqin Plastics Co., Ltd.

实践证明, products defect main/primary in mold design, manufacturing degree and abrasion loss degree and other 方面. 但事实 upper, plastics processing 厂 人员往往苦于面 for use process 手段 弥补 mold defect belt/tape issues formed large difficult 局面.

production process in process adjustment is improve/increase products quality and output/production volume necessary 途径. due to cycle very short, if process conditions 掌握不 good, waste product 就会源源不绝. in adjustment process most good one-time 改变一 conditions, more 观察几回, if pressure, temperature degree, time 统统一起调 话, very easy formed mixed and understanding, issues 也不知道 is 何道理. adjustment process measures, is more 方面. 例如: solution products 注不满 issues has more can can solution 途径, need selection solution issues 症结 一, main/primary solution/scheme, can true positive solution issues. in addition, also attention/notes solutions in 辨证关系. ratio 如: products 出现 凹陷, has need improve/increase material temperature, has need reduce material temperature; has need increase material amount, has need decrease/reduce material amount. need 承认逆 toward measures solution issues can property.

plastics molding 不完整, this is 一 经常遇 to issues, comparison easy solution. use process 手段确实 solution 不 时, can from mold design manufacturing upper 考虑进行改进, generally is can solution.

一, equipment 方面:

（1） injection molding machine 塑化容 amount small. products quality ultra- injection molding machine most large injection quality 时, 显然 供 material amount is 入不敷出. products quality injection molding machine injection quality 时, has 一 塑化不够充 separation issues, material in machine inner hot time 不足, 结果不 can and toward mold provide 适当 熔 material. this type of has more amount large injection molding machine can solution issues. has plastics nylon （ especially is nylon 66 ）熔 melt scope/range narrow, ratio hot relatively large, use 塑化容 amount large injection molding machine can ensure material supply.

（2） temperature degree 计显示 temperature degree true 实, high low, formed material temperature low. this is due to temperature plant/unit hot electrical and its or temperature milli 伏计失灵, or is due to 远离测 temperature electrical hot aging or 烧毁, add temperature 失效而 also 未曾发现 or has and 时修复 more 换.

(3) nozzle inner 孔直径太 large or small. small, due to 流通直径 small, material strip/profile ratio increase large, easy cold, 堵塞进 material or consumption injection pressure; large, 则流通截面积 large, plastics mono 位面积 pressure low, formed force small 状况. meanwhile non type plastics 如ABS因没 has obtain large hot can make degree decline formed 充模困 difficult. nozzle and runner 入口配 combined defect, 常常发生模 outer material, inner 充不满 phenomenon. nozzle flow retardant force very large or has material, plastics 炭化沉积 material and other 堵塞; nozzle or runner 入口球面 loss 伤, deformation, effect/influence and for 方 良 good combined; base/seat machine fault/failure or 偏差, make nozzle and runner generate 倾侧位移 or toward pressure 紧面脱离; nozzle ratio runner 入口球径 large, 因边缘出现间隙, in material lower increase large nozzle toward force 都会造 formed products 注不满.

（4） plastics block add material 通道. due to plastics in material drying device inner local 熔化结 block, or machine material temperature degree high, or plastics and other grade selection 不当, or plastics inner lubricant more make plastics in 进入进 material shrink 径位置 or screw 起螺端 deep inner 早 熔化, material and material versus 黏结形 formed “ 桥”, 堵塞通道 or screw, screw as sliding, can front 移, formed material in or random 则波动. this type of has in 凿通通道, troubleshooting material block rear can to solution.

（5） nozzle cold material 入模. injection molding machine usually 都因顾 and pressure loss 失而 装直通式 nozzle. is if machine front and nozzle temperature degree high, or in high pressure lower machine front material more, generate “流涎”, make plastics in 未开始 injection mold 敞开 情况 lower, outer 抢先进入主 runner 入口并 in sheet/plate cooling function lower hard, 而妨碍熔 material 顺畅 进入 type 腔. this 时, reduce machine front and nozzle temperature degree and decrease/reduce machine 筒 储 material amount, decrease low back pressure pressure machine front material density large.

（6） injection molding cycle short. due to cycle short, material temperature and upper 也会造 formed material, in electrical pressure large especially obvious. need according to electrical electrical pressure for cycle as versus adjustment. adjustment generally 不考虑 injection and holding pressure time, main/primary adjustment from holding pressure to screw that time, effect/influence molding conditions, also can long or shrink short material in machine inner preheating time.

二, mold 方面

（1） mold system has defect. runner small, thin or long, increase retardant force. runner increase 直径, runner, separation runner formed relatively good. runner or relatively large, force 不足; runner, gate has 杂质, material or material 堵塞; runner, gate coarse has 伤痕, or has 锐角, surface coarse degree defect, effect/influence material 流不畅; runner has cold material or cold material small, direction for; for/regarding more type mold need fine runner and gate large small separation 配 均衡, 否则会出现 has runner or gate coarse short type can 够注满而 its it type can 注满 情况. 应适当 add coarse runner 直径, make to runner 末端 熔 material pressure drop decrease/reduce, also need add large runner relatively type gate, make type 腔 注入 pressure and material speed degree basic 一致.

（2） mold design combined 理. mold separation complex, more, material selection 不当, runner narrow, gate amount or 形式不当; products local very thin, increase products or local thick degree, or in filling 不足处 附近设置辅助 runner or gate; mold cavity inner gas measures force formed made parts phenomenon is 屡见不鲜, this type of defect large more in products 转弯处, deep 凹陷处, by thick separation thin separation and use gate molding thin housing/shell and other 处. remove this type of defect design 包括开设 has 效 排 gas 孔道, selection combined gate make gas easy 预先排出, necessary 时特意 will type 腔 困 gas certain local made formed parts, make gas from parts 缝隙溢出; for/regarding more type mold easy gate separation balanced 情况, necessary decrease/reduce injection type 腔 数 amount, ensure its it type made parts combined 格.

三, process 方面

（1）进 material adjustment 不当, material or more material. add material amount or add material control system as positive 常, injection molding machine or mold or as conditions 限导致 injection cycle 反常, back pressure small or machine inner material density small can can formed material, for/regarding pellets large, more material and crystallization property ratio 容变化 large plastics polyethylene (PE), polypropylene (PP), nylon and other and degree relatively large plastics 如ABS应调 relatively high material amount, material temperature high 时应调 large material amount.

当 machine 筒端部存 material more 时, injection screw need consumption outer more injection pressure pressure 紧, machine inner ultra- 额囤 material, this large large reduce mold cavity plastics has pressure make products difficult 以充满.

（2） injection pressure low, injection time short, or screw 退回太早. melt plastics in low as temperature degree lower degree relatively high, flow property 差, relatively large pressure and speed degree injection. ratio in made ABS color color made parts 时, color agent high temperature resistance property made machine add hot temperature degree, this need ratio usually high injection pressure and long injection time 弥补.

（3） injection speed degree slow. injection speed degree for/regarding 一 形状 complex, thick thin large, process/workflow long products, and degree relatively large plastics toughened property ABS and other tool has separation 突出 意义. using/adopting high pressure can products 时, can using/adopting high speed injection can 克服注不满 毛病.

（4） material temperature low. machine front temperature degree low, type 腔 熔 material due to mold cooling function make degree upper rise to difficult flow 步, for 远端 充模; machine rear temperature degree low, degree large plastics flow difficult, retardant screw front 移, 结果造 formed pressure table/sheet pressure 足够而实际 upper material in low pressure low speed lower type 腔; nozzle temperature degree low can can is solid add material nozzle long time and cold mold dispersion hot amount, or nozzle add hot hot or defect formed material temperature low, can can mold material 通道; if mold belt/tape cold material 井, use nozzle, using/adopting rear add material 程序, nozzle relatively can maintain temperature degree; rigid machine nozzle cold has can use 火焰枪做 outer add hot accelerated nozzle rise temperature.

四 raw materials 方面

plastics flow property 差. plastics 厂常常 use recycled material, recycled material 往往会反映出黏 degree increase large toward. 实验指出: due to oxidation understanding formed separation 子断链 mono 位体积 density increase, this increase in machine and type inner flow viscous property, recycled material long relatively more gas material generate, make injection pressure loss increase large, formed 充模困 difficult. is improvement plastics flow property, 应考虑 add outer lubricant hard acid or its salt type, most good use silicon 油（黏 degree 300~600cm2/s）. lubricant add improve/increase plastics flow property, also improve/increase stability property, decrease/reduce gas material gas retardant.

溢 material （ flash ）

溢 material also flash, 溢边, and other, large more in mold separation combined upper, 如: mold separation type 面, slip block slip 配部位, parts 缝隙, 顶杆 孔隙 and other 处. material and solution will 会进一步 expand large 化, from pressure mold formed local 陷塌, formed property loss 害. parts and 顶杆孔隙 溢 material also make products in upper, effect/influence demolding.

一 equipment 方面

（1） machine true positive clamping force 不足. selection injection molding machine 时, machine clamping force must high injection molding products toward 投影面积 in injection formed force, will formed 胀模, flash.

（2） clamping plant/unit adjustment 不佳, machine has 伸直, generate or left right or upper lower clamping 不均衡, mold degree can to phenomenon formed mold mono 侧一边 by combined 紧而另一边不密贴 情况, injection will flash.

（3） mold 本身平行 degree 不佳, or 装 不平行, or sheet/plate 不平行, or 拉杆受 force distribution 不均, deformation 不均, this will formed clamping 不紧密而 generate flash.

（4）止回 ring abrasion loss heavy; elastic nozzle elastic 簧失效; material or screw abrasion loss large; material cooling system 失效造 formed “架桥” phenomenon; machine 筒调定 注 material amount 不足, 缓冲垫 small and other can can formed flash 反复出现, must and repair or more parts.

二 mold 方面

（1） mold separation type degree 差. active sheet/plate （如 in sheet/plate ） deformation warpage; separation type upper has material or frame has 凸出 橇印毛刺; mold 因早先 flash pressure make type 腔周边 fatigue 塌陷.

（2） mold design combined 理. mold type 腔 开设位置 偏, injection mold mono 边发生张 force, flash; plastics flow property good, polyethylene (PE), polypropylene (PP), nylon and other, in melt lower degree very low, easy active or solid 定 缝隙, requirements mold manufacturing degree relatively high; in effect/influence products property front lower amount in quality for in upper, in products thick 实 部位入 material, can anti 止一边缺 material belt/tape flash 情况; products in or its has molding 孔时, upper in upper 开设侧 gate, in relatively large injection pressure lower, if clamping force 不足模 this separation function force 不够发生 light micro warpage formed flash, mold belt/tape has active parts 时, its 侧面 投影面积也受 molding pressure function, if force 不够也会造 formed flash; sliding type combined degree defect or solid type and type 腔安装位置偏移而 generate flash; type gas defect, in separation type upper has gas or gas shallow or deep large or material retardant will formed flash; for more type mold attention/notes separation runner combined gate combined design, will formed 充模受 force 不均而 generate flash.

三 process 方面

（1） injection pressure high or injection speed degree fast. due to high pressure high speed, for mold force increase large 导致溢 material. need according to products thick thin adjustment injection speed degree and injection time, thin products need use high speed speed 充模, rear again 进注; thick products need use low speed 充模, let table/sheet in to pressure front large solid lower.

（2） add material amount large formed flash. value attention/notes is need is anti 止凹陷而注入 more material, this 样凹陷未必 can “填平”, flash 却会出现. this type of application long injection time or holding pressure time solution.

（3） machine 筒, nozzle temperature degree high or mold temperature degree high make plastics degree decline, flow property increase large, in 流畅进模 情况 lower formed flash.

四 raw materials 方面

（1） plastics degree high or low can can flash. degree low plastics nylon, polyethylene (PE), polypropylene (PP) and other, improve/increase clamping force; water property strong/high plastics or for water plastics in high temperature lower large degree reduce flow degree, increase flash can can property, for this plastics must drying; recycled material more plastics degree decline, necessary need 补充滞留 formed separation. plastics degree high, flow retardant force increase large, generate large back pressure make mold cavity pressure improve/increase, formed clamping force 不足而 generate flash.

（2） plastics raw materials degree large small 不均时会 make add material amount 变化不定, made parts or 不满, or flash.

凹痕(塌坑, 瘪形）

因 plastics cooling hard 化而造 formed shrinkage 凹陷, main/primary in thick 壁位置, strip/profile, machine housing/shell, 螺母嵌 parts and other 处.

一 equipment 方面

（1）供 material 不足. screw or abrasion loss heavy, injection and holding pressure material 发生漏流, reduce pressure and material amount, formed material 不足.

（2） nozzle large or small. small easy 堵塞进 material 通道, large will make force small, 充模发生困 difficult.

二 mold 方面

（1） gate small or runner or shallow, runner efficiency low, retardant force large, material cooling. gate can large, 否则失 剪切 speed rate, material degree high, 同样不 can make products saturated 满. gate 应开设 in products thick 壁部位. runner in necessary has 足够容 amount cold material can troubleshooting cold material type make 充模持续进行. gate, gate gate long degree need control in 1mm below/following, plastics in gate solid fast, effect/influence pressure 传递; necessary can increase gate or gate 位置以 meet/satisfy need; runner long thick 时, in runner 边缘设置排 gas 沟槽, decrease/reduce gas for material retardant function.

（2） more gate mold need adjustment gate speed degree, most good for 称开设 gate.

（3） mold key/critical 部位应 has 效 设置 cooling water 道, ensure mold cooling for remove or decrease/reduce shrinkage very good 效果.

（4）整 mold belt/tape 毛刺且 tool has can clamping property, can high pressure, high speed, low degree material 充模.

三 process 方面

（1） increase injection pressure, holding pressure pressure, long injection time. for/regarding flow property large plastics, high pressure generate flash 引起塌坑应适当 reduce material temperature, reduce machine front and nozzle temperature degree, make type 腔 熔 material 容积变化 decrease/reduce, easy cold solid; for/regarding high degree plastics, improve/increase machine temperature degree, make 充模容 easy. shrinkage in gate 区域时应延 long holding pressure time.

（2） improve/increase injection speed degree can relatively make made parts 充满并消 remove large separation shrinkage.

（3） thin made parts improve/increase mold temperature degree, ensure material 流顺畅; thick made parts decrease low mold temperature accelerated table/sheet solid type.

（4）延 long made parts in inner cooling time, maintain uniform production cycle, increase back pressure, screw front 段保留一定 缓冲垫 and other has decrease/reduce shrinkage phenomenon.

（5） low degree products and 早出模 let its in gas in or hot water in slow cooling, can make shrinkage 凹陷平缓 also effect/influence use.

四 raw materials 方面: raw materials soft easy 发生凹陷, has methods is in plastics in add nucleating agent add fast crystallization.

五 products design 方面: products design make thick uniform, amount 避免壁 thick 变化, polypropylene (PP) this category of shrinkage very large plastics, thick degree ultra- 出50%时, most good use strip/profile add thick 部位.

银纹, bubbles and gas 孔

plastics in process in to gas dry 扰常常 in products surface silver streaks or micro small bubbles or products thick inner formed bubbles. this gas 体 源 main/primary is raw materials in has water separation or easy material or lubricant amount, can can is material temperature high plastics hot time long degradation generate degradation gas.

一 equipment 方面: nozzle small, material material in nozzle 处流涎 or wire drawing, machine or nozzle has material or 毛刺, high speed material 流经 时 generate scratch hot make material separation understanding.

二 mold 方面:

（1） due to design upper defect, 如: gate 位置不佳, gate small, more gate made parts gate 排布不 for 称, runner fine small, mold cooling system combined make mold temperature 差异太 large and other formed material in mold cavity inner flow 不连续, 堵塞 空 gas 通道.

（2） mold separation type less necessary gas or gas 孔道不足, 堵塞, 位置不佳, also has parts, 顶针之 type processing 缝隙排 gas, molding in gas can in plastics 进入时 meanwhile 离.

（3） mold surface coarse degree 差, scratch retardant force large, formed local hot 点, make through plastics separation understanding.

三 process 方面

（1） material temperature high, formed separation understanding. machine temperature degree high or add hot 失调, 应逐段 decrease low machine temperature degree. add material temperature degree high, make separation plastics melt 充满螺槽, gas method from add material 口排出.

（2） injection pressure small, holding pressure time short, make material and type surface 不密贴.

（3） injection speed degree fast, make melt plastics large function separation understanding, generate separation understanding gas; injection speed degree slow, can and 时充满 type formed products surface density generate 银纹.

（4） material amount 不足, add material 缓冲垫 large, material temperature low or mold temperature low effect/influence material flow and molding pressure, generate bubbles.

（5） use more injection decrease/reduce 银纹: in speed injection runner → slow speed gate → fast speed injection → low pressure slow speed will 模注满, make inner gas can in and troubleshooting dry 净.

（6） screw 预塑时 back pressure low, speed high, make screw 退回太 fast, gas easy material 一起推 toward machine front 端.

四 raw materials 方面

（1） raw materials in mixed types plastics or material in a large amount of powder material, melt easy belt/tape gas, has 时会出现银纹. raw materials 受污染 or has has property material raw materials easy hot separation understanding.

（2） recycled material material structure hydrophobic 松, micro in 储留 空 gas amount large; recycled material recycled more or and new material ratio/proportion high （ generally small 于20%）

（3） raw materials in has property solvent agent or raw materials in liquid additives 如助染 agent 白油, lubricant silicon 油, increase agent ester and stabilizer, anti-static agent and other use amount more or mixed combined 不均, 以积集状态进入 type 腔, formed 银纹.

（4） plastics has drying or from large gas in 吸潮. for raw materials separation drying use drying material 斗.

（5） has grade plastics, 本身不 can relatively high temperature degree or relatively long hot time. especially is has micro amount water separation 时, can can catalytic reaction. for this type plastics need add outer lubricant hard acid and its salt type （每10kg material can add 至50g）, amount reduce its processing temperature degree.

五 products design 方面: thick thick, table/sheet cooling speed degree different. in mold manufacturing 时应适当 add large runner, separation runner and gate dimensions.

    熔接痕

熔 melt plastics in type in due to to parts, 孔洞, speed 不连贯 区域, material in 断 区域而以 more 股形式汇 combined and gate 喷射充模时, can full melt combined generate 线状 熔接痕. 熔接痕 存 in large low products machine strong/high degree. 克服熔接痕 办 method and decrease/reduce products methods basic same.

一 equipment 方面: defect, melt temperature degree 不均, can long cycle, make more full, necessary more 换塑化容 amount large machine.

二 mold 方面

（1） mold temperature degree low, 应适当 improve/increase mold temperature degree or has improve/increase 熔接缝处 local temperature degree.

（2） runner fine small, or shallow, cold material small. increase runner dimensions, improve/increase runner efficiency, meanwhile increase cold material 井 容积.

（3） expand large or shrink small gate 截面, gate 位置. gate need amount melt in parts, 孔洞 周围 flow. 发生喷射充模 gate need method positive, or add block 缓冲. amount use or less use more gate.

（4）排 gas defect or has gas 孔. 应开设, expand or hydrophobic gas 通道, its in utilizing parts, 顶针缝隙排 gas.

三 process 方面

（1） improve/increase injection pressure, long injection time.

（2）调 good injection speed degree: high speed can make material and drop temperature to combined 处, low speed can let type inner gas has time 排出.

（3）调 good machine and nozzle temperature degree: temperature degree high plastics degree small, 流态通畅, 熔接痕变 fine; temperature degree low, decrease/reduce gas material separation understanding.

（4） demolding agent amount less use, especially is silicon demolding agent, 否则会 make material can melt combined.

（5） reduce clamping force, 以利排 gas.

（6） improve/increase screw speed, make plastics degree decline; increase back pressure pressure, make plastics density improve/increase.

四 raw materials 方面

（1） raw materials drying amount decrease/reduce formulation in liquid additives.

（2） for flow property or hot property high plastics 适当添 add lubricant and stabilizer, necessary use flow property good or heat resistant property high plastics.

五 products design 方面

（1）壁 thick small, add thick made parts 以免 早 solid 化.

（2）嵌 parts 位置不当, adjustment.

发脆

products very large separation is due to internal stress formed. formed products causes very more, main/primary has:

一 equipment 方面

（1） machine inner has or material, easy promote material degradation.

（2） machine 塑化容 amount small, plastics in machine inner 塑化不充 separation; machine 塑化容 amount large, plastics in machine inner hot and 受剪切 function time long, plastics easy aging, make products 变脆.

（3） ejection plant/unit or balanced, dry 截面积 small or distribution 不当.

二 mold 方面

（1） gate small, 应考虑 adjustment gate dimensions or increase 设辅助 gate.

（2） separation runner small or 配置不当, amount balanced combined or increase separation runner dimensions.

（3） mold structure defect formed injection molding cycle 反常.

三 process 方面

（1） machine 筒, nozzle temperature degree low, high it. if material material easy degradation, improve/increase machine 筒, nozzle temperature degree.

（2） reduce screw back pressure pressure and speed, make material is hydrophobic 松, decrease/reduce plastics 因剪切 hot formed degradation.

（3） mold temperature high, demolding difficult; mold temperature low, plastics cooling, 熔接缝 melt combined defect, easy cracking, especially is high melting point plastics polycarbonate (PC) and other more is 如此.

（4） type type need has demolding degree. type difficult demolding 时, need improve/increase type temperature degree, shrink short cooling time; type difficult 脱时, need reduce type temperature degree, long cooling time.

（5）尽 amount less use metal parts, polystyrene (PS) this category of property cold hot ratio large plastics, more can add parts injection molding.

四 raw materials 方面

（1） raw materials mixed has its it or 掺杂 不适当 or amount solvent agent or its it additives 时.

（2） has plastics 如ABS and other, in 受潮状况 lower add hot and water 汽发生 catalytic reaction, make made parts large 应变.

（3） plastics recycled 次数太 more or recycled material content high, or in machine inner add hot time long, 都会促 make made parts 脆裂.

（4） plastics quality 不佳, molecular weight distribution large, has rigid property separation and other non-uniform structure formed separation has amount large; or its it plastics 掺杂污染, defect additives 污染, 灰尘杂质污染 and other is formed causes.

五 products design 方面

（1） products belt/tape has easy 出现应 force cracking 尖角, or thick degree versus very large 部位.

（2） products design thin or 镂空太 more.

变 color

造 formed color causes is more 方面, main/primary has:

一 equipment 方面

（1） equipment dry 净. or its it powder 尘沉积 in material upper make material material 受污染变 color.

（2） hot electrical 偶, temperature or add hot system 失调造 formed temperature 控失灵.

（3） machine in has material, easy promote plastics degradation; machine or inner has metal material, abrasion make plastics color.

二 mold 方面

（1） mold gas defect, plastics by hot pressure shrink, in high temperature high pressure lower and oxygen gas reaction, plastics.

（2） mold gate small.

（3） material in or inner lubricant, demolding agent more. necessary 时应定期清洁 material 筒, remove ratio plastics heat resistant property also anti-static property and other additives.

（4） nozzle 孔, runner and separation runner dimensions small.

三 process 方面

（1） screw speed high, back pressure large.

（2） machine 筒, nozzle temperature degree high.

（3） injection pressure high, time long, injection speed degree fast make products color.

四 raw materials 方面

（1） material material by 污染.

（2） water separation and material content high.

（3） color agent, additives separation understanding.

    or liquid

造 formed this type of defect causes main/primary is in equipment and raw materials 方面:

一 equipment 方面

（1） machine in has 焦黑 材 material.

（2） machine has 裂痕.

（3） screw or abrasion loss.

（4） material 斗附近不清洁.

二 mold 方面

（1） type inner has 油.

（2） from ejection plant/unit in 渗入油.

三 raw materials 方面:

（1） raw materials 不清洁.

（2） lubricant 不足.

    dark 纹

一 equipment 方面:

injection hot property plastics rear, machine 筒未清洗 dry or nozzle has material 垫导致 injection 开始时排 gas 不畅.

二 mold 方面:

（1）排 gas defect.

（2） gate small or gate 位置不当.

（3） type local retardant force large, make material combined relatively slow formed gas difficult.

三 process 方面:

（1） machine 筒, nozzle temperature degree high.

（2） injection pressure or back pressure high.

（3） injection speed degree fast or injection cycle long.

四 raw materials 方面:

（1） pellets 不均, has powder 末.

（2） raw materials in material content high.

（3） lubricant, demolding agent use amount more.

    gloss good

一 equipment 方面:

（1）供 material 不足.

（2）换 material machine 筒未清洗 dry 净.

二 mold 方面:

（1） gate small or runner fine.

（2） type surface coarse degree 差.

（3）排 gas defect or mold temperature low.

（4）没 has cold material 井.

三 process 方面:

（1） machine add hot non-uniform, machine temperature degree high or low.

（2） nozzle small or back pressure low.

（3） injection speed degree large or small.

（4）塑化 non-uniform.

四 raw materials 方面:

（1） raw materials drying 处理.

（2）含 has property material 质.

（3） additives or demolding agent use amount more.

    demolding difficult (gate or parts shrink in mold inner)

一 equipment 方面: ejection force 不够.

二 mold 方面:

（1） demolding structure combined or 位置不当.

（2） demolding degree 不够.

（3） mold temperature high or gas defect.

（4）浇道壁 or type surface coarse 糙.

（5） nozzle and mold material combined 不服帖 or nozzle large material 口直径.

三 process 方面:

（1） machine temperature degree high or injection amount more.

（2） injection pressure high or holding pressure and cooling time long.

四 raw materials 方面: lubricant 不足.

   warpage deformation

一 mold 方面:

（1） gate 位置不当 or amount 不足.

（2） ejection 位置不当 or products force non-uniform.

二 process 方面:

（1） mold, machine temperature degree high.

（2） injection pressure high or injection speed degree fast.

（3） holding pressure time long or cooling time short.

三 raw materials 方面: 酞氰系颜 material effect/influence polyethylene (PE) crystallization degree 而导致 products

deformation.

四 products design 方面:

（1）壁 thick 不均, 变化突然 or thick small.

（2） products structure type 不当.

       dimensions unstable

一 equipment 方面:

（1） add material system positive 常.

（2） back pressure or temperature 不稳.

（3） liquid pressure system fault/failure.

二 mold 方面:

（1） gate and runner dimensions 不均.

（2） type dimensions 不准.

三 process 方面:

（1） mold temperature or cooling 回路不当而致 mold temperature control combined 理.

（2） injection pressure low.

（3） injection holding pressure time or has 波动.

（4） machine temperature degree high or injection cycle unstable.

四 raw materials 方面:

（1）换批 production 时, resin property can has 变化.

（2） material material pellets large small random 律.

（3）含 wet amount relatively large.

（4） more additives for shrinkage has effect/influence.

    crazing 汽白

一 mold 方面: ejection machine 构不佳.

二 process 方面:

（1） machine temperature degree low or mold temperature degree low.

（2） injection pressure high.

（3） holding pressure time long.

三 raw materials 方面:

（1） lubricant, demolding agent or use amount more.

（2） grade, product grade suitable.

四 products design 方面: products design combined 理, local force in.

   delamination 剥离

一 process 方面:

（1） machine 筒, nozzle temperature degree low.

（2） back pressure low.

（3） for/regarding PVC plastics, injection speed degree fast or mold temperature degree low can can formed delamination 剥离.

二 raw materials 方面:

（1） raw materials or mixed material.

（2） different plastics mixed 杂.

   and 鼓泡

has plastics products in molding demolding rear, very fast in metal parts or in especially thick 部位出现肿胀 and 鼓泡, this is due to full cooling hard plastics in inner pressure function lower gas 体膨胀造 formed. solution measures:

（1） reduce mold temperature, long mold opening time.

（2） reduce material drying temperature degree and processing temperature degree; reduce speed rate; decrease/reduce molding cycle; decrease/reduce flow retardant force.

（3） improve/increase holding pressure pressure and time.

（4） improvement products 壁面太 thick or thick thin large 状况.

    production slow

（1） plastics temperature degree high, products cooling time long. reduce machine temperature degree, decrease/reduce screw speed or back pressure pressure, adjustment good machine 筒各段 temperature degree.

（2） mold temperature degree high, effect/influence type, also formed 卡, made parts machine. need has for property add strong/high water cooling.

（3）模塑 time unstable. using/adopting or semi 自动操 as.

（4） machine hot amount 不足. using/adopting can force large machine or add strong/high for material preheating.

（5） improvement machine production conditions, pressure, amount, clamping force and other.

（6） nozzle 流涎. control good machine and nozzle temperature degree or use 自锁式喷

嘴.

（7） made parts thick thick. 应改进 mold, decrease/reduce thick.

2. injection system

injection system is injection molding machine 心脏部 separation, its function is ensure 定时, amount material material add thermoplastic 化, rear 以一定 pressure and fast speed degree versus one-time injection amount melt plastics mold cavity inner, injection also need has holding pressure time toward mold cavity inner 补充一部 separation cooling shrinkage material, make products and anti mold cavity inner material material 反流. therefore, injection plant/unit must ensure plastics uniform 塑化, has injection pressure and holding pressure pressure. can meet/satisfy this requirements injection plant/unit main/primary has 柱塞式, 柱塞— screw 式, screw and other.