Shanghai Daoqin Plastics Co., Ltd.

   ABS通称 acrylonitrile butadiene styrene, is acrylonitrile-butadiene-styrene (ABS) types mono copolymer formed. due to types mono ratio/proportion different, can has different property can and melt temperature degree, flow property can ABS如 and its it plastics or additives blending, more can expand large different applications and property can ABS, impact resistant grade, heat resistant grade, flame retardant grade, transparent grade, reinforced grade, electroplating grade and other.     

    ABS flow property 介于PS and PC between, its flow property and injection temperature degree and pressure has 关系, its in injection pressure effect/influence large, therefore molding using/adopting relatively high injection pressure reduce melt viscosity, improve/increase property can.   
  
    1, plastics 处理  

    ABS water absorption large is 0.2%-0.8%, for/regarding generally grade ABS, processing front use 烘箱以80-85℃烘2-4 small or use drying material 斗以80℃烘1-2 small 时. for/regarding 含PC组份 heat resistant grade ABS, dry temperature degree 适当调 high 至100℃, specific dry time can use for extrusion 确定.   

    recycled material use ratio/proportion can ultra- 30%, electroplating grade ABS不 can use recycled material.     

    2, injection molding machine selection   

    can selection 华美达 standards injection molding machine （ screw long ratio 20: 1, pressure shrink ratio large 于2, injection pressure large 于1500bar）. if using/adopting color masterbatch or products appearance requirements material high, can selection small grade screw. clamping force according to 4700-6200t/m2 确定, specific according to plastics and other grade and products requirements 而定.
  
    3, mold and gate design   

    mold temperature degree can is 60-65℃. runner 直径6-8mm. gate wide 约3mm, thick degree and products 一样, gate long degree need small 于1mm. gas wide 4-6mm, thick 0.025-0.05mm.     

    4, temperature degree   

    can use for injection method 准确判定. and other grade different, temperature degree different, setting lower:     

    impact resistant grade: 220℃-260℃, 以250℃ is 佳  

    electroplating grade: 250℃-275℃, 以270℃ is 佳  

    heat resistant grade: 240℃-280℃, 以265℃-270℃ is 佳  

    flame retardant grade: 200℃-240℃, 以220℃-230℃ is 佳  

    transparent grade: 230℃-260℃, 以245℃ is 佳  

    glass fiber reinforced grade: 230℃-270℃    

    for/regarding surface requirements high products, using/adopting relatively high temperature degree and mold temperature.    
 
    5, injection speed degree   

    anti grade need use slow speed, heat resistant grade use fast speed. products surface requirements relatively high, need use high speed and more grade injection molding speed control.
    
    6, back pressure   

    generally lower back pressure low good, commonly used back pressure is 5bar, color material use relatively high back pressure make mixed color uniform.
    
    7, time   

    in 265℃ temperature degree lower, ABS in 熔胶筒 inner time most more can ultra- 5-6 separation 钟. flame retardant time more short, 如需停 machine, setting temperature degree low 至100℃, again use general purpose grade ABS清理熔胶筒. rear mixed combined material need cold water in anti 止进一步 separation understanding. from its it plastics 改打ABS material, need use PS, PMMA or PE清理熔胶筒. has ABS products in rigid demolding 时并无 issues, time rear has color, this can can is hot or plastics in 熔胶筒停留 time long 引起.   

    8, products rear 处理  

    generally ABS products rear 处理, has electroplating grade products 需经烘烤（70-80℃, 2-4 small 时）以钝化 surface 痕迹, and electroplating products can use demolding agent, products rear need packaging.   

    9, molding need especially attention/notes 事项  

    has types and other grade ABS（ especially is flame retardant grade ）, in rear its melt for screw surface force very large, time long rear separation understanding. 当出现 upper 述情况时, need screw 均化段 and pressure shrink scratch 试, 并定期 use PS and other screw.   

    material temperature degree   

    material 区     40～60℃（50℃）  

    区1        160～180℃（180℃）  

    区2        180～230℃（210℃）  

    区3        210～260℃（240℃）  

    区4        210～260℃（240℃）  

    区5        210～260℃（240℃）  

    nozzle         210～260℃（240℃）  

    inner temperature degree as is basic setting value, utilizing rate is 35％ and 65％, parts long and thick ratio is 50: 1 to 100: 1  

    material temperature      220℃  

    mold temperature degree      40～80℃  

    injection pressure      100～150MPa（1000～1500bar）  

    holding pressure pressure   

    holding pressure time versus for relatively short, injection pressure 30％～60％  

    material temperature degree      220～250℃  

    back pressure            5～15MPa（50～150bar）; if back pressure low, material in 裹入 空 gas formed 焦化（ in products inner has 灰黑纹路）
  
    injection speed degree   

    most good using/adopting separation grade injection: from slow to fast; need injection speed degree to good surface gloss, most small combined and combined high strength; need in front runner combined 处开设通 gas 隧道  

    screw speed   

    most large screw speed combined speed degree is 0.6m/s, most good will screw speed low 一点, need can in cooling time front formed process can   

    amount 行程 
 
    （0.5～4）D  

    material amount        2～8mm, 取决于计 amount and screw 直径  

    dry        ABS in has lower can from raw materials bag inner 直接喂 material 无需预烘 dry, in 80℃ temperature degree lower dry 3h; wet pellets formed products has cracks, scratch or bubbles   

    recycling rate   

    can add 30％ 回 material, front is front material has thermal degradation   

    shrinkage rate        0.4％～0.7％  

    gate system   

    can use gate and hot runner; most small thick small 于0.7mm, is ABS flow property relatively 差  

    machine 停工时段  

    use its it material 清洗  

    material equipment   

    standards screw, ring, nozzle