As in the classic injection molding process, the plasticized thermoplastic is injected into the injection mold. At a certain point, an inert gas (nitrogen N2) is also injected at high pressure into the still viscous plastic mass.
The high pressure of the gas displaces the melt and creates a cavity in the component. The displaced material is pressed out of the mold and into a collecting channel and can be reused later.
The advantage of this process is, among other things, the lower weight (up to 30% less part weight).