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There is a gas assisted injection molding technology in plastic manufacturing are applied in squeezing the large thickness and details allow empty hole inside (the kind of plastic handles, plastic support arm pipe types, ...). By pumping the gas on and keep the pressure on, the mixture of molten plastic is likely fill the position angles of the mold, keep the air pressure in the cooling process to make the details to avoid concave defects co and warping, surface beauty products. Often used as nitrogen. In special cases, can use fluid (water) for gas. Today, there are aid injection has also developed and is located in the injection molding method group has guided fluid (fluid assisted injection molding). The fluid action here may be gas, water, or other special solution.
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