Poor venting of the injection mold will bring a series of harms to the quality of plastic parts and many other aspects. The main manifestations are as follows:

1) During the injection molding process, the melt will replace the gas in the cavity. If the gas is not discharged in time, it will be difficult to fill the melt, resulting in insufficient injection volume to fill the cavity. _

2) The gas that is not smoothly removed will form high pressure in the cavity and penetrate into the plastic under a certain degree of compression, causing quality defects such as pores, voids, and loose tissue.

3) As the gas is highly compressed, the temperature in the cavity rises sharply, which in turn causes the surrounding melt to decompose and burn, causing local carbonization and scorching of the plastic parts. It mainly appears at the confluence of the two melts, the corners and the flange of the gate. _

4) Unsmooth removal of gas makes the speed of melt entering each cavity different, so it is easy to form flow marks and fusion marks, and reduce the mechanical properties of plastic parts. _

5) Due to the obstruction of the gas in the cavity, the filling speed will be reduced, the molding cycle will be affected, and the production efficiency will be reduced.