Method for making hollow solid generated by rotation
AssigneeSaint-Gobain Vetrotex France S.A.
InventorsJean-Paul Debalme, Jacques Voiron, Alexandre Cividino
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Abstract
The present invention relates to a hollow body of revolution (1), the wall of which comprises an internal first region (a) made, at least on its external periphery, of a single thermoplastic organic material A, and a second region having a first part (b), arranged so as to be continuous with the first region (a) and made of a thermoplastic material identical to the material A and of continuous glass yarns embedded in the said thermoplastic material, and a second part (c) forming the external periphery of the hollow body and made only of thermoplastic material. According to the invention, the wall has a volume void content Vv of less than 0.5%, preferably less than 0.2%.
Claims14
Process for manufacturing a hollow body of revolution, the wall of which is made of a material comprising a thermoplastic organic material in which continuous glass yarns are embedded, said material being wound helically around the axis of said body, comprising carrying out the following steps in line:
- a) helically winding a tape in the heated state around a tube rotating about its axis without applying heat where the tape comes in contact with the tube, at least the external face of the wall of which tube comprises the thermoplastic organic material, the tape comprising the thermoplastic material and the continuous glass yarns;
- b) heating part of the outer peripheral surface of the tube coated with the tape in a zone located immediately downstream of the zone where the tape comes into contact with the tube, to a temperature above the melting point of the thermoplastic organic material;
- c) applying local pressure to that part of the outer peripheral surface of the tube coated with the tape in a zone located immediately downstream of the heating zone of the step b).
Dependencies are inferred from the claim text.