Patent ID: 6303070
Filing Date: 2001-10-16
Classification: B29B,B29C,B29K,Y10T

Abstract:
Process for producing a thermoplastic moulded part, which comprises the following steps:a) dispersing reinforcing fibres in a melt of a polyolefin or a polycondensation polymer,b) injecting the polymer composition thus obtained into a closed mould by means of an extruder or an injection-moulding machine, wherein the polymer composition, having an amount of moisture less than 5000 ppm, is injected into the mould through a converging nozzle, without the use of a chemical foaming agent, the mould is partly opened when at least a part of the surface of the moulded part has cooled to below the softening temperature of the polyolefin or the polycondensation polymer while the centre of the moulded part has a temperature above said softening temperature, and 1 to 60 wt. % of the polymer composition consists of reinforcing fibres having an average length of between 0.8 and 15 mm.