Options
Patent
Title
Verfahren zur Verarbeitung von Prepreg-Verschnittresten
Other Title
Moulding of composite plate in recycled carbon fibre-reinforced prepreg offcuts - has prepreg separated from protective film, cut into smaller pieces and fed to cutting mill which drops milled material onto carrier film and recycled material is moulded with(out) carrier film.
Abstract
The recycling and processing uncured prepreg offcuts of carbon fibre-reinforced thermosetting resin involves: a) removing the protective film from the pre-preg and cutting the offcuts into smaller pieces; b) passing the offcuts through a cutting mill at 20 deg. C below the glass transition temperature of the uncured resin; c) placing the milled recycled material on a carrier and processing in a pressing or autoclaving process to cure the resin. A claimed plate moulded in the recycled material after removal of the carrier film has a density of 0.7-0.8g/ cm3, tensile strength of 80 MPa and a bending stiffness of 140MPa in a three point bending test. A similar plate moulded in the same material together with the carrier film has a density of 1.2g/cm3, tensile strength of 100MPa and bending stiffness of 190MPa. USE - The process is for recycling carbon fibre-reinforced prepreg offcuts occuring especially in the aerospace industry. ADVANTAGE - The prepreg structure is largely retained so th at products moulded in the recycled materials still have high physical properties.
Inventor(s)
Pannkoke, K.
Patent Number
1996-19640786
Publication Date
1998
Language
German