Institut Francais Du Pe'trole

Ifp Energies Nouvelles

Technip France

Emmanuel Vinciguerra

Francois Dawans

Alain Coutarel

Jacques Jarrin

Serge Gonzalez

Bernard Dewimille

Frédéric Demanze

Gilles Ausias

Michel Vincent

Xavier Lefebvre

Bruno Flaconneche

Marie-Hélène Klopffer

Fibre-reinforced tubes made of a thermoplastics material are manufactured using a method of extruding thermoplastics material in a drawplate with a diverging end zone, the end zone of which has a diverging annular flow space which has a ratio A.sub.s /A.sub.e between the exit area and entry area of at least 1.2, and a ratio between the length 1 of the lower edge of the annular exit space of the diverging zone and the width e of the straight section of said annular space which is less than 5; the extrusion operation being carried out in the presence of a liquid lubricant which is incompatible with said thermoplastics material at extrusion temperatures, said lubricant being present at the level of the external wall and at the level of the internal wall of said flow space. Tubes which are manufactured by way of this method are particularly resistant to a high degree of bursting and have an improved surface quality.

Extrusion of tubes of fiber-reinforced thermoplastics

Growing community of inventors

Nanterre, France

Emmanuel Vinciguerra