Gas assisted injection molding technology process: first of all or part of the molten resin is injected into the mold cavity, and then immediately injected with inert gas pressure, the gas pushes the melt in die process or fill the void left by the resin shrinkage after solidification, in the discharge of gas, and then out of the plastic parts. Gas assisted injection molding technology are generally pre injection, gas injection, holding pressure, mold in the air emissions, excess nitrogen recycling, product release and several other process.
  Gas assisted injection molding are usually short shot and surjective two forms. First, a certain amount of melt injection, then immediately to the melt by injecting gas, gas pressure to promote melt to fill the whole cavity, and gas pressure, until the resin curing, and then discharged gas and release. The Surjectivity is completely filled the cavity in the resin begins after gas injection, melt due to cooling shrinkage will clear a flow channel along the channel for the two time, gas penetration, not only can make up for the plastic shrinkage, but also by the gas pressure of pressure keeping better.