Shanghai Daoqin Plastics Co., Ltd.

according to material features and material 情况, generally in molding front for material appearance and process property can testing. supply material 往往含 has different degree water separation, agent and its it easy low separation material, especially is tool has wet toward TPR含 water amount is ultra- processing 允许 限 degree. therefore, in processing front must drying 处理, 并测定含 water amount. in high temperature lower TPR water separation content requirements in 5％ below/following, 甚至2％～3％, therefore commonly used true drying in 75℃～90℃ drying 2 small 时. already drying material must 妥善密封保存, anti material from gas in again wet 而丧失 drying 效果, is using/adopting drying material can is injection molding parts machine provide drying hot material, for as 业, maintain 清洁, improve/increase quality, increase injection speed rate is has 利. drying material 斗 装 material amount generally injection molding parts machine small use material amount 2.5倍. 以SBC is TPE in color upper excellent large more its it TPR材 material. therefore, it need relatively a small amount of masterbatch material can to certain types color 效果, but also generate color ratio its it TPR more is pure 净. generally 说, masterbatch material viscosity ratio TPR viscosity low, this is is TPR melt flow index ratio masterbatch material high, this will has dispersion process, make color distribution more add uniform. for/regarding 以SBS is TPE, recommendation using/adopting polystyrene (PS) type color agent. 　　 for/regarding relatively hard SEBS is TPR, recommendation using/adopting polypropylene (PP) (PP)载 color agent. 　　 for/regarding relatively soft SEBS is TPR, can using/adopting low density polyethylene (PE) or ethylene-vinyl acetate (EVA) copolymer. for/regarding relatively soft product types, recommendation using/adopting PP载 color agent, is composite/compounding material hardness will to effect/influence. 　　 for/regarding certain overmolding injection molding parts application, use polyethylene (PE) (PE)载 color agent can can for and bonding force generate effect/influence. 　 new injection molding parts machine use front, or in production in need product, more raw materials, color or plastics in has separation understanding phenomenon 时, need for injection molding parts machine machine 筒进行清洗 or 拆洗. 　　　清洗 machine generally using/adopting add hot machine 筒清洗 method. material generally use plastics raw materials （ or plastics recycling material ）. for/regarding TPR材 material, can use processing new material 置换出 渡清洗 material. 　　 in processing injection molding parts process in, temperature degree setting is 否准确 is products appearance and property can good bad key/critical. lower is 进行TPR processing injection molding parts temperature degree setting 一 建议. 　　进 material temperature degree setting versus low, 以避免进 material 口堵塞并 let belt/tape gas 逸出. use masterbatch material is improvement mixed combined 状态, will 渡区域 temperature degree setting in masterbatch material melting point above. injection molding parts nozzle most 近区域 temperature degree setting 接近于 需 melt temperature degree. therefore, testing, usually TPR product in 各 区域 temperature degree setting scope/range separation is: material is 160摄氏 degree to 210摄氏 degree, nozzle is 180摄氏 degree to 230摄氏 degree. 　　 injection molding parts mold temperature degree setting high and injection molding parts cold temperature degree, this will can water separation for injection molding parts mold 污染以致 products surface strip/profile 纹. relatively high injection molding parts mold temperature degree usually 会导致 relatively long ring cycle, it can welding and products appearance 效果, therefore, injection molding parts mold temperature degree scope/range design in 30 to 40 between. 　　 in products molding filling injection molding parts mold type process in, if products filling property can good, 就会发生 pressure reduce large, filling time long, filling and other and other 情况, from make products in quality issues. is improve/increase products in molding filling property can, improvement molding products quality, generally can from lower several 方面 考虑: 1）改换另一 series product; 2）改变 gate 位置; 3）改变 injection pressure; 4）改变 parts 几何形状. 　　 usually will injection pressure control separation formed is one-time injection pressure, injection pressure （ holding pressure ） or above injection pressure control. pressure 切换时 machine is 否适当, for/regarding anti inner pressure high, anti material or material and other is non important. products ratio 容取决于 holding pressure stage/phase gate 封闭时 熔 material pressure and temperature degree. if from holding pressure to products cooling stage/phase pressure and temperature degree 一致, that products ratio 容就不会发生改变. in 恒定 模塑 temperature degree lower, products dimensions most important parameters is holding pressure pressure, effect/influence products dimensions most important amount is holding pressure pressure and temperature degree. 例如: in 充模结束 rear, holding pressure pressure reduce, table/sheet formed thick degree 时, holding pressure pressure again upper rise, this can using/adopting low clamping force molding thick large products, remove and flash. 　　 holding pressure pressure and speed degree usually is plastics mold cavity most high pressure and speed degree 50％~65％, holding pressure pressure ratio injection pressure large low 0.6~0.8MPa. due to holding pressure pressure ratio injection pressure low, in can holding pressure time inner, negative low, solid use lifespan long, meanwhile electrical machine consumption electrical amount reduce. using/adopting adjustment good 一定 计 amount, make in injection 行程 终点附近, screw still has a small amount of melt （缓冲 amount ）, according to inner filling 情况进一步施 add injection pressure （二次 or injection pressure ）, less melt. this 样, can anti products or adjustment products shrinkage rate. cooling time main/primary 取决于 melt temperature degree, products thick and cooling efficiency. in addition, material material hardness is factors. and very soft product types comparison, relatively hard product types in injection molding parts mold inner will relatively fast solid. if from 两侧进行 cooling, that 么每0.100' thick cooling time usually will is large 约10 to 15秒. overmolding methods products will need relatively long cooling time, is it can through relatively small surface has cooling. 每0.100'壁 thick cooling time will is large 约15 to 25秒. 1 plastics molding 不完整（1）进 material adjustment 不当, material or more material. （2） injection pressure low, injection time short, or screw 退回太早. （3） injection speed degree slow. （4） material temperature low. 2 溢 material （ flash ）（1） injection pressure high or injection speed degree fast. （2） add material amount large formed flash. （3） machine 筒, nozzle temperature degree high or injection molding parts mold temperature degree high make plastics degree decline, flow property increase large, in 流畅进模 情况 lower formed flash. 3 银纹, bubbles and gas 孔（1） material temperature high, formed separation understanding. （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） 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. 4 烧焦 dark 纹（1） machine 筒, nozzle temperature degree high. （2） injection pressure or back pressure high. （3） injection speed degree fast or injection cycle long.