injection molding how to design gas vent

injection molding how to design gas vent. Gas vent is space that air can go out of mold.
Gas vent standard at parting line, core pin, ejector pin, ...
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Gas vent is space that air can go out of mold. When molten plastics fills up the mold. The air or molten plastics left in the mold will generate gas. If they can not go out of mold, appearance of samples will not good: have gas, fire, …
There are several ways to place a gas vent to the mold, but it can be classified broadly into the following three ways.
・ Parting line:from the divided face of the mold.
・ From the cavity and core part, ejector system.
・ Gas venting by other special way.
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