Gas injection molding

Gas injection molding, 19 789 Gaskohle coal grade (Germany), 6 713t Gaskool coal grade (Netherlands),... 

Gas-injection molding n. A specialized technique for molding low-density structures in which a mixture containing cork particles, or glass or phenolic microspheres, glass fibers, and a thermosetting resin is injected into a mold by fluidizing it in a gas stream. 

S. Shah and D. Hlavaty, Gas injection molding of an automotive structural part. Plastics Engineering, October, 21-25 (1991). 

There are different gas-assist injection molding (GAIM) processes. Other names exist that include injection molding gas-assist (IMGA), gas injection molding (GIM), or injection gas pressure (IGP). Most of the gas-assisted molding systems are patented. This review concerns the use of gas, however there are others such as water-assist injection molding. 

Gas Assist/Gas Injection molding for extra weight reduction and sink elimination. 

In the gas injection molding process, compressed nitrogen gas is blown into the molding instead of the secondary injection. The gas breaks the gate and runs into the inner side of the molding, especially at thicker-walled sites, where the temperature is higher and the melt viscosity is lower, and a hollow-shaped article is formed as a result. 

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