7.What is the function of the back flow valve?
逆止阀的功能是什么?
How is shrinkage affected by mould temperature?
模具温度如何影响收缩率?
2. Why are vents used on injection moulds?
为什么在注塑成型模具中使用排气槽?
3. Which type of plastic material has the higher shrinkage rate? A)Amorphous B)Semi Crystalline
哪种塑料的收缩率比较高? A)非结晶体 B)半结晶体
4. How would you improve weld or flow lines ?
如何改善结合线或流痕?
5.Apart from raising the barrel temperature what other techniques can be used to raise the melt temperature?除了提高料管温度外,还可以使用其他什么方法来提高融料温度? 6)Why is a balanced runner system on a mould so important?
为什么在模具中平衡的流道系统非常重要?
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