It is well known that the exhaust of injection mold is a problem that cannot be ignored in the mold design.Mold inner product set in the normal production of gas mainly has the following sources: 1. The feed system and the entities of the air in the cavity. 2. The plastic contains moisture evaporation and water vapor generated at high temperature. 3. The gas produced by plastic decomposition. 4. Some volatile or chemical additives in plastic reflect the generated gas 5. Inclusion in the feed air and moisture.

Common exhaust forms are: 1. Exhaust slot or hole exhaust.2. Exhaust of parting surface.3. Vent the gap of Mosaic.4. Push rod or ejector clearance exhaust.5. Powder burning combined with gold block exhaust.6. Set the exhaust rod for forced exhaust.