Shanghai Daoqin Plastics Co., Ltd.

1. foaming 孔不足

causes: （1） foaming agent quality issues;

      （2）胶 material can degree low;

      （3） mixing/compounding temperature degree high, foaming agent separation understanding;

      （4）胶 material time long or temperature degree high, separation foaming agent or separation understanding;

      （5）胶 material speed degree fast;

      （6） pressure high, ultra- foaming agent gas 体 形 formed inner pressure, formed foaming 孔不足;

countermeasures: （1）检查 foaming agent is in has 限期限 inner, is combined 格;

      （2）检查胶 material can degree is combined standards, can degree low 应补充 mixing/compounding, increase large can degree 以利于发孔;

      （3）检查密炼 machine material temperature degree is high, temperature is high, material is scorching/burn marks. 一 因 mixing/compounding temperature degree high material can a small amount of and or add foaming agent heavy 工;

      （4）停放 time long material 应返炼进行补充 processing;

      （5） formulation adjustment, 检查硫化 agent temperature degree and foaming agent separation understanding temperature degree is 否接近, versus 互协调, make speed degree and foaming speed degree versus combined;

      （6） adjustment machine pressure.

2. filling 模不足

causes: （1） use amount 不足;

      （2） mold light degree or mold use 久未清洁, material flow to retardant force;

      （3） mold cavity complex and material flow property versus combined, rear 往往不 can filling mold 顶端, formed defect;

      （4） mold cavity inner 死角处 空 gas 排不出, make material filling mold cavity, 导致边缘 short shot;

countermeasures: （1）逐 strip/profile amount, ensure material weight;

       （2） improve/increase material flow property;

       （3）修改 mold, combined design gas 孔, separation 模构造 and other.

3. foaming non-uniform （ large or small ）

foaming large, product hardness, density combined standards, 闭孔会变 formed 联孔, micro formed small 孔, certain separation 发生塌陷 or certain separation 发不起.

causes: （1） foaming agent or pellets coarse;

      （2） mixing/compounding non-uniform;

      （3）配 combined agent water amount high, material in mixed has gas or 杂质;

      （4）硫化不足, rear 继续发孔;

countermeasures: （1）检查 foaming agent, has phenomenon 应 筛, pellets coarse powder 碎, separation mixing/compounding （ or thin 通） make dispersion uniform;

      （2）配 combined agent water separation high drying rear use, remove material in gas or 杂质, make separation 硫化.

4. or 欠硫化

（1） 硫化

generally surface color, relatively small, hardness relatively high, product 边缘裂开, generate causes is as 不当, or temperature degree high, time or table/sheet 失灵, 应检查各阀门 and table/sheet is has issues, again need 严格执行操 as 规则.

（2）欠硫化

硫化不足时, rear gas inner pressure large outer pressure, material 若继续发孔, light formed hardness low, strong/high property 差, deformation large; heavy 则孔眼爆破. 应检查仪 table/sheet, is has issues, 严格执行操 as 规则.

注: foaming products control quality indicators

（1） table/sheet density, small good;

（2） machine strong/high degree generally is 0.5-1.6Mpa;

（3）静 pressure shrink deformation;

（4） hardness;

（5） impact elastic property;

（6）连续动 fatigue;

（7） aging test （70 degree *70 small 时; 100 degree *24 small 时）;

（8） low temperature experiment/testing.