Each claim states how it is known and cites its evidence.
EstablishedNon-structural automotive parts from SMC and BMC; natural fibre composites.
Compression moulding is simple, fast, repeatable and holds tight tolerances, and the U.S. Department of Energy reported it in 2015 as widely used for non-structural automotive parts made from short-glass-fibre sheet and bulk moulding compounds; it is also one of the most common processes for natural fibre composites.
Evidence support: Supported by the cited evidence · 2 sources, multiple sources, independence unknown
Evidence: U.S. Department of Energy 2015 · Primary authority; L. 2016 · Peer-reviewed
EstablishedCostly moulds and presses; residual stress, delamination, warpage, flow orientation.
Compression moulding needs large capital investment in moulds and presses, and parts can suffer from residual stresses, delamination, warpage and fibre orientation caused by flow.
Evidence support: Supported by the cited evidence · one source
Evidence: U.S. Department of Energy 2015 · Primary authority
Established14 MPa
In compression moulding the mould is closed under pressures of up to 14 MPa, forcing the charge to take the shape of the cavity.
- precision note: An upper bound: the source gives pressures up to 14 MPa, and low-pressure compression moulding (cold press moulding) runs well below it.
Evidence support: Supported by the cited evidence · one source
Evidence: U.S. Department of Energy 2015 · Primary authority
EstablishedA fibre–resin charge pressed into the shape of a closed mould.
In compression moulding a charge, often a mixture of fibres and resin — typically sheet or bulk moulding compound, in which fibres are pre-compounded with a thermoset resin — is placed in the mould cavity and the mould is closed under pressure so the charge flows into its shape; for natural fibre composites with thermoplastic matrices, fibres are usually stacked with matrix sheets before heat and pressure are applied.
Evidence support: Supported by the cited evidence · 2 sources, multiple sources, independence unknown
Evidence: U.S. Department of Energy 2015 · Primary authority; L. 2016 · Peer-reviewed