The application of back pressure can ensure that when the screw is rotated and reset, it can generate enough mechanical energy to melt and mix the plastic.

Back pressure also has the following uses:

①Put volatile gases, including air, out of the shot tank;

② Mix the additives (such as toner, color species, antistatic agent, talc, etc.) with the melt evenly;

③ homogenize the melt flowing through the length of the screw;

④ Provide uniform and stable plasticized material to obtain accurate weight control of the finished product.

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