Shanghai Daoqin Plastics Co., Ltd.

1, silver streaks issues silver streaks is PC/ABS材 material Common issues, silver streaks also 称银纹, water 花, material and other, is in products surface flow direction 出现 银 color filament strip/profile phenomenon.

 

main/primary causes is gas dry 扰, its in generate gas also main/primary separation is types formed separation: gas: and injection shot stage/phase 卷入 空 gas; water separation: material 本身含 has water separation;裂 understanding gas: high temperature hydrolysis / hot separation understanding generate gas 体.

solution methods: 首先检查材 material is drying separation, in 确认材 material drying separation rear, again through adjustment injection molding process improvement silver streaks defect. meanwhile, injection molding silver streaks defect also and mold gas has 关.

2, flow issues flow is material material in injection generate, causes is material material flow property defect, flow and different, appearance 不一样.

solution methods: can through improve/increase material material temperature degree from improvement flow property 避免, improve/increase material material in mold inner flow property and reduce injection speed degree.

3, shrink and issues shrink is due to material material in mold cavity inner 充模不足而引起.

solution methods: improve/increase mold temperature degree and material material temperature degree improvement material material flow property, long injection holding pressure time, increase injection molding pressure, add large injection speed degree improve/increase property, can add large gate dimensions, add hot gate runner decrease/reduce and remove products shrink 孔;

凹痕 is due to material material temperature degree 不当, and products design 不妥引起, material material temperature degree low 时, not only generate shrink 孔, also 会出现凹痕 issues, material material temperature degree high, mold temperature degree high, make material in cooling separation shrinkage, from generate 凹痕.

solution methods: improve/increase injection speed degree.

 

4, warpage deformation issues injection molding parts warpage deformation is due to made parts design combined 理, gate 位置不当 and injection molding processing conditions combined 理, 以致于 internal generate internal stress, shrinkage or degree 致, mold temperature degree high or mold temperature degree non-uniform, injection molding parts viscous film formed demolding difficult, or cooling non-uniform, 同样会 generate warpage deformation;

solution methods:

processing process 方面: add long injection molding cycle, reduce injection molding temperature degree, adjustment injection molding pressure and injection speed degree, meanwhile reduce ejection speed degree, increase ejection 面积, maintain ejection force 均衡;

products design 方面: increase thick, increase add strong/high and 圆角处 补 strong/high;

5, issues usually is due to high speed injection 时, material expand 张进入 mold cavity formed “ melt 破裂” 致.

solution methods:

molding process 方面: improve/increase material material temperature degree, nozzle temperature degree, decrease slow injection speed degree and other decrease/reduce 斑纹 出现;

mold 方面: improve/increase mold temperature degree, increase increase 溢槽, increase gate dimensions, gate 形状.

6, issues solution methods: dispersion property 差, add dispersant or 油, rise high temperature degree, add back pressure. also has is is mold issues. use its it material.

烤 material temperature degree time is 否足够. adjustment mold temperature degree.

7, products “ peeling ” issues plastics product peeling issues and high force lower 导致 流体 破裂 has very large 关系, in low 剪切应 force or speed rate lower, various factors small by melt made;而 in high 剪切应 force or speed rate lower, in difficult made, development formed unstable flow;当达 to 一 临界剪切 force 时, will 引起流体 破裂.

solution methods:

材 material 方面: is mixed material formed peeling defect is need 第1步 troubleshooting, PC and ABS两组份 between is separation versus 容, therefore in modified process in need add 入适当 increase agent improve/increase its versus property;

mold 方面: mold design 原则需遵 from amount decrease/reduce direction 进行. generally 说, 密集皮纹面 product more add easy generate peeling phenomenon (high speed filling melt in type inner and type inner 壁 摩 scratch 剪切 致); meanwhile gate design upper, gate dimensions small, will generate melt through gate generate degree 剪切, 继而导致 product surface peeling;

injection molding process: main/primary direction is degree 剪切. in product filling difficult 时, can using/adopting high speed high pressure methods improvement, therefore in injection molding process in, also can improve/increase injection molding temperature degree / mold temperature degree, and improve/increase material flow property methods reduce filling process in flow retardant force, from 而避免 high speed high pressure degree 剪切.