Shanghai Daoqin Plastics Co., Ltd.

gas 体辅助 injection molding technology is new plastics injection molding technology, its principle is utilizing high pressure gas in parts internal generate in 空截面, utilizing gas holding pressure plastics injection holding pressure, remove products shrink 痕, formed injection molding process. gas 体辅助 injection molding process process main/primary plastics melt injection, gas injection, gas holding pressure stage/phase.

according to melt injection amount different, also separation is short and 满射两 types methods, in short methods in, gas 体首先推动 melt type 腔, rear holding pressure; in methods in, gas 体 起 holding pressure function.

gas 体辅助 injection molding technology advantages main/primary has:

1. solution made parts surface shrink issues, can large large improve/increase made parts surface quality.

2. local add gas increase thick can increase made parts strong/high degree and dimensional stability, reduce products internal stress, decrease/reduce warpage deformation.

3. 节约 Raw Materials, most large can 达40%～50%.

4. 简化 products and mold design, reduce mold processing difficult degree.

5. reduce mold cavity pressure, decrease small clamping force, long mold lifespan.

6. cooling add fast, production cycle shrink short.

gas 体辅助 injection molding technology and injection molding process versus ratio, has can ratio advantages, by is injection molding process one-time revolutionary, in home appliances, automotive, furniture, day commonly used product and other has plastics made parts field/area to application. in home appliances field/area, electrical machine housing/shell especially is large color electrical front housing/shell is most is most using/adopting gas injection molding technology products 之一.

  gas products and mold design basic 原则

1. design 时先考虑 which thick need 掏空, which surface shrink need remove, again how to this formed is gas 道.

   
   

2. large structural parts: comprehensive thin, local add thick is gas 道.

   
   

3. gas 道应依循 main/primary material direction 均衡 配置 to mold cavity upper, meanwhile 应避免闭路式 gas 道.

   
   

4. gas 道 截面形状应接近圆形以 make gas flow 顺畅; gas 道 截面 large small need combined 适, gas small can can gas 体渗透, gas large 则会引起熔接痕 or gas 穴.

   
   

5. gas 道应延伸 to most rear 充填区域（ generally in non appearance upper ）, 但不需延伸 to type 腔边缘.

   
   

6. 主 gas 道应尽 amount simple, separation gas long degree amount versus and other, gas 道末端 can shrink small, retardant gas accelerated.

   
   

7. gas can 直则不弯（弯越 less good ）, gas 道转角处应 using/adopting relatively large semi 径.

   
   

8. for/regarding more mold, type 腔都需由独立 gas gas.

   
   

9. 若 has can can, let gas 体 推进 has types selection.

   
   

10. gas 体应局限于 gas inner, 并穿透 to gas 道 末端.

    
    

11. 精确 type dimensions non important.

    
    

12. products separation cooling non important.

    
    

13. using/adopting gate gas 时, flow balanced property for uniform gas 体穿透 non important.

    
    

14. 准确 熔胶 injection amount non important, injection amount 误差不应 ultra- 0.5%.

    
    

15. in most rear 充填处设置溢 material 井, can promote gas 体穿透, increase gas 道掏空 rate, remove 迟滞痕, stability products quality. in type and material between add gate, can ensure most rear 充填发生 in material inner.

    
    

16. gas gas 时, small gate can anti gas 体倒流入浇道.

    
    

17. 进 gate can thin 壁处, and and gas maintain 30mm above 距离, 以避免 gas 体渗透 and 倒流.

    
    

18. gas 嘴应置于 thick 壁处, 并位于离 most rear 充填处 most 远 方.

    
    

19. gas gas direction amount and material direction 一致.

    
    

20. maintain flow front 沿以均衡 speed degree 推进, meanwhile 避免形 formed V字 type flow front 沿. using/adopting material injection 时, gas front 未充填 type 腔体积以不 ultra- gas 道总体积 一 semi is 准.

    
    

21. using/adopting material injection 时, 应参照 plastics pressure, ratio and temperature degree 关系图, make gas 道总体积 一 semi and other type inner plastics shrinkage amount.