Shanghai Daoqin Plastics Co., Ltd.

        一, equipment 方面:

        （1） injection molding machine 塑化容 amount small

        若 products quality ultra- injection molding machine most large injection quality 时, material amount 入不敷出;若 products quality injection molding machine injection quality 时, 则塑化不充 separation, material in machine inner hot time 不足, can and toward mold provide 适当 熔 material. more amount large injection molding machine.

        （2） temperature degree 计显示 temperature degree true 实, high low, formed material temperature low

         due to temperature plant/unit (如 hot electrical and its or temperature milli 伏计)失灵, or 远离测 temperature electrical hot aging or 烧毁, add temperature 失效. and 时修复 more 换.

        （3） nozzle inner 孔直径太 large or small

        太 small, due to 流通直径 small, material strip/profile ratio increase large, easy cold, 堵塞进 material or consumption injection pressure;太 large, 则流通截面积 large, plastics mono 位面积 pressure low, formed force small 状况.

        如ABS因没 has obtain large hot, can make degree decline, from 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;注 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, machine material temperature degree high, plastics and other grade selection 不当, 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, 导致粒 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, from 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.

        消 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

        熔 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

         main/primary is is plastics flow property 差. very more plastics 厂常常 use recycled material, recycled material 往往会反映出黏 degree increase large toward. 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.