MANUFACTURE OF ELONGATED HOLLOW BODIES FROM FIBRE-REINFORCED SYNTHETIC RESINS

摘要

1497834 Producing wound pipes continuously J S M GUIX 27 May 1975 [5 June 1974 21 Jan 1975] 23089/75 Heading B5A [Also in Divisions F2 and B8] A pipe or other hollow body is produced in a continuous length by winding resinimpregnated fibrous material 40a (Fig. 1A) over a resin impregnated fibrous substructure 7a on a continuously rotating mandrel 5, the hollow body being continuously moved over the mandrel 5 by units 21 to a cutting device. Mandrel and fibre application.-(Figs. 1A) The tubular mandrel 5 is rotated by a motor 9, and rigidly supports disc 2 and a pair of toothed rings 3, 31. One or both sides of the disc 2 supports brackets 7 for spools 7a of continuous fibres, which are passed through a resin bath D1 guided by teeth on the rings 3, 31, and are laid on the mandrel 5 by curved wires 12. A stand S supports fibre spools 40a and a guide G which can weave these fibres after passage through a resin bath D2, and apply them spirally and overlapped. Heating.-The resin is hardened on the mandrel by an infra-red external heater 61 and heaters inside the mandrel, and after removal from the mandrel by internal and external heaters Q. Removing the hollow body from the mandrel.- The fibrous body is gripped by a pair of traction heads 21 mounted on a pair of threaded, rotating spindles 17, 18 (Fig. 9) for movement therealong. Each head 21 comprises a drawing plate attached to two non-rotary members 20 moving one along each spindle 17, 18, and a plate 22 rotating at the same speed as the mandrel 5 and rings 3, 31 while supporting spring-urged jaws 27. The plate 22 is rotated by a pulley 29 suspended from a trolley 3 7. Operation.-The mandrel 5 is lubricated and/or covered with a pipe lining of rovings, paper strip, fabric, polyethylene, or pulverulant material, either manually or using the ring unit 3, 31. The fibres 7a are fed onto the mandrel 5 and guide 12, and the mandrel and rings 3, 31 then rotated to apply the fibres 7a and 40a to the lining, with the same or different resins D1, D2. The fibres 40a are in band, tape or filament form. A pivoted roller (160) (see Figs. 1B, 4, not reproduced) expels air from the fibre/resin layers. A plurality of rollers C detect the thickness of the pipe and control the fibre feed rate or roller pressure to adjust the thickness. The heaters 61 harden the resin, and the pipe, after passing from the end of the mandrel 5, is internally coated with resin by a head P and thickness gauge R, either continuously or intermittently, and the coating hardened by the heaters Q. The reciprocating traction heads 21 remove the formed pipe and pass it to a cutter.