Gas injector GAIM

Gas injection technology With gas injection technology, gas is injected into the plastic melt at the end of the injecting process. The injected gas displaces the melt on the inside thus resulting in a cavity being formed. • Short shot, cavity is partially filled with plastic melt. The plastic melt is pressed against the mold wall with the injected fluid. • Full shot, entire cavity is filled with plastic melt. The injected fluid forces the melt into an adjoining cavity. • Full shot back pressure procedure, entire cavity is filled with plastic melt. The injected fluid forces the melt through the sprue bushing back into cylinder vestibule. The GIT mold injector Gas injectors are installed directly into the mold. One or more injectors are assembled into the mold, depending of the size and geometry of the molded part as well as the fluidity of the melt. With an installation either parallel or diagonal to the form direction, the mold injector must be used with an extraction mechanism. Arguments for Herzog injectors • Small dimensions • Back-gassing (gas pressure release) • Ensures high process stability • Self cleaning function • Low maintenance • Assembly / disassembly at the mold interface level Design and function of the injector The regulated gas, usually nitrogen, is fed through drillings in the mold to the injector and through this into the molded part. The back-gassing or gas pressure release goes through the same injector back into the supply. The gassing of the cavity is only possible when the gas injection pressure is higher than the opposing pressure in the cavity.