Low pressure resin injection moulding is one of the main processing technologies for high performance composite polymer materials. This systems significantly cuts the number of procedures and production times, at the same time greatly improving the quality of the final product, especially in terms of its surface finish. This process is thus more cost-effective, competitive and flexible than conventional technologies. It involves: opening the two half-moulds (male and female) and arranging the dry fibres in these; resin is then injected into holes along the resin volume in the closed half-moulds to form the reinforcement. The resin follows a flow path that must be precisely foreseen in order to impregnate all the fibres (as per specifications) and to prevent the fibres from shifting due to excessive pressure applied by the resin.
RTM (Resin Transfer Moulding) technology is used to produce items of constant thickness or otherwise. It also allows for the sinking of inserts and so means that Lamiflex can mould items in a vast range of sizes using a multitude of different composite materials to suit the client’s specific needs.
RTM Light technology (Resin Transfer Moulding) involves injecting catalysed resin into a closed mould containing glass fibre, carbon fibre, sandwich and various inserts. Once the resin has set, the mould can be opened and the item removed.
The vacuum pump provides two vacuum levels: -0.9 bar for closing the mould and counter-mould and -0.5 bar to help the resin flow during injection. The moulds are quick and easy to prepare thanks to the low injection pressures. The counter-mould is semi-rigid and made from a composite material with thin walls. Items may take anything from a few minutes to several hours to produce when using the RTM Light method, though the use of heated moulds helps cut production times considerably.