Shanghai Daoqin Plastics Co., Ltd.

1, ABS recycled plastics 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℃, high low temperature 实验箱, 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, experiment/testing 箱, 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 引起应先 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. 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.
8, time
in high temperature lower time long, material material drop 质, 放也CO2, formed color. use LDPE, POM, ABS or PA清理 machine 筒. application PS清理