The IWK materials and plastics processing institute at HSR university in Rapperswil, Switzerland, has developed a carbon reinforced plastic (CFRP) trumpet for DaCarbo by using lost core technology in resin transfer moulding (RTM).
To make the trumpet, IWK used a two part-mould. Each part has an aluminium end-piece and a diecast bismuth-tin alloy core, Plastic Mould and receives a preform consisting of several braided hoses for resin impregnation and curing. The finished cured trumpet body is removed then the lost cores are melted in a hot water bath for re-use, along with the aluminium end-pieces.
The trumpet, exhibited at Fakuma 2011, has no condensed water pitting corrosion, which often happens with brass trumpets. It is also more robust, weighs less and needs fewer adjustments before playing, says IWK.
The institute's head, Frank Ehrig, told European Plastics News the trumpet is also easier to play because it requires less air pressure. Trumpet players at the Zurich Tonhalle orchestra have not detected differences in tone quality over a brass trumpet, he adds.
IWK developed the trumpet with CarboHorns Swiss, now DaCarbo, founded in 2009 by Werner Spiri, who has 30 years experience in making trumpets at his Musik Spiri company, and Andreas Keller, a material scientist at the ETH university in Zurich.
Keller says the DaCarbo trumpet produces a warm, full-bodied sound, as it suppresses energy-consuming wall vibrations better than brass.
The molding industry is growing by leaps and bounds. Amongst the many mold manufacturers, SINOPK is the best. It is the world’s leading mold manufacturer and has been engaged in this industry for the past many years.
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