Gas assisted injection moulding

Gas-assisted injection moulding is a variant of injection moulding suitable for producing parts with internal cavities or hollow parts. It is used for the manufacture of products such as household appliances and automobile parts. 

Figure 5.5 schematizes the principle of gas-assisted injection moulding. Adding to the advantages of injection are ... 

Gas-assist injection moulding is becoming a frequently-used process for forming hollow, stiff parts. Foamed material, sandwich structures with compatible core and face sheets, and sandwich constructions with recycled material are other examples of how intelligent material utilisation can lead to source reduction. 

Cinpres. Gas assisted injection moulding, a plastics manufacturing technique. Ciment Fondu. Trade-name aluminous hydraulic cement. (Lafarge Aluminous Cement Co. Ltd, 73 Brook St., London, Wl) For general properties of this type of cement see high-alumina cement. See also gorkal cement. 

Other current developments designed to create a more rigid carrier without weight increase are the use of blow mouldings or gas-assisted injection mouldings, or box sections made from injection mouldings. PP, ABS and PC/ABS blends are the likely materials. 

Fig. 2.27 Diagram of a GIM installation Combined with a high-pressure evaporator, Desy is a practical nitrogen supply system for gas-assisted injection moulding (GIM).

W. Michaeli, A. Brunswick and M. Gruber, Step on the Gas with Water Injection Water Assisted Injection Moulding (WAIM) An Alternative to Gas Injection Kunststoff Plast Europe, 1999, 89, 4, 20. 

Whilst injection moulding can be considered a relatively young manufacturing technology, many variants of the basic process have been developed. Examples include processes such as injection-compression, gas assisted, water injection, co-injection and over-moulding. Each of these processes are suitable for specific market applications. An overview of the technologies covered in this chapter is shown in Figure 10.1. 

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