Resin Injection Molding

Resin Infusion is a composite manufacturing method that works very well for small to large flat plates as well as very large composite parts. Resin Transfer Molding (RTM) and Vacuum-Assisted Resin Transfer Molding (VARTM) combine the concept of resin infusion with either an open or closed mold. These methods are cost effective compared to operating an autoclave. The resin infusion process is a technique that injects the thermosetting resin systems (EP, PUR, UP) into one-piece molds (tools) using a vacuum. The dry fabrics (CFRP / GFRP) are fixed on the mold using a vacuum bag and then, usually at room temperature, impregnated with the resin system via vacuum. Resin infusion is the process whereby resin is drawn into a dry laminate whilst it is held under vacuum against a rigid mould by a sealed flexible membrane. The most commonly used membrane consists of a disposable film (vacuum bag) and this film is sealed against the mould edges using a sealant tape.

Resin infusion is particularly relevant when making very large structures as tooling costs are relatively low. Unlike RTM, the ‘B’ surface finish of the resulting laminate is not controlled cosmetically but excellent laminate properties can be achieved. Volatile emissions can also be dramatically reduced making resin infusion an excellent alternative to large-scale open moulding.
Resin infusion is the process whereby resin is drawn into a dry laminate whilst it is held under vacuum against a rigid mould by a sealed flexible membrane. The most commonly used membrane consists of a disposable film (vacuum bag) and this film is sealed against the mould edges using a sealant tape. Resin infusion is particularly relevant when making very large structures as tooling costs are relatively low. Volatile emissions can also be dramatically reduced making resin infusion an excellent alternative to large-scale open moulding.