Patent ID: 8747720
Filing Date: 2014-06-10
Classification: B29B,B29K

Abstract:
1. A liquid composite moulding process comprising the steps of: providing an uncured resin mixture comprising a liquid thermosetting resin selected from the group consisting of liquid epoxy resin and liquid bismaleimide resin and a particulate hardener for said liquid thermosetting resin, said particulate hardener being dispersed within said liquid thermosetting resin, said particulate hardener having a dissolution temperature above which said particulate hardener dissolves in said thermosetting resin, said uncured resin mixture being at a pot temperature and having a pot viscosity; heating said uncured resin mixture to a dissolution temperature for a sufficient time to dissolve said particulate hardener and form a liquid heat-treated resin mixture that has a viscosity which is below said pot viscosity; cooling, said liquid heat-treated resin mixture to a temperature below said dissolution temperature to form a liquid resin mixture in which said particulate hardener is dissolved; introducing said liquid resin mixture into a mould that contains a fibrous structure; maintaining said liquid resin mixture within said mould at a dwell-temperature, which is below said dissolution temperature, for a sufficient dwell-time to infuse said fibrous structure with said liquid resin mixture; and curing said liquid resin mixture at a cure temperature.