Effect of Air on Injection Molding Process and Principle of Choosing Parameters of Mold Venting Solt

Injection molding defects, such as underfeeding, burning, gas mark and silver streak etc., can be found mainly because of bad mold venting. This paper studied the air state changing in a mold cavity during mold filling, analysed results of calculation, explainded the reasons for producing injection defects,and finally proposed the principles of choosing parameters of mold venting slot.