moulding-additive-manufacture > Vacuum Assisted Resin Transfer

Vacuum assisted Resin Transfer Moulding (VARTM) is best suited for medium volume production. It is identical to Resin Transfer Moulding apart from the fact a Vacuum is used to draw the resin through the laminate. The process requires a males and female mould with a set cavity gap between their faces which the composite will fill. This cavity determines the composite thickness.

The dry fibres are laid up into the female half of the mould, the male plug is then placed on top and a vacuum is drawn, clamping the moulds together. A valve is opened, and Resin is drawn into the mould using one or more entry ports. Some VARTM techniques are performed at room temperature however to reduce cycle times, heated moulds can be used.