(19)

(11)

EP 0 020 556 A1

(12)

(43) Date of publication: 07.01.1981 Bulletin 1981/01 (21) Application number: 79901462.0 (22) Date of filing: 09.11.1979

(51) International Patent Classification (IPC):  D21F 7/ 08( . ) (86) International application number: PCT/GB1979/000185 (87) International publication number: WO 1980/001086 (29.05.1980 Gazette 1980/12)

(84) Designated Contracting States: FR (30) Priority: 15.11.1978 GB 19440065278 23.11.1978 GB 19450088178 (71) Applicant: SCAPA-PORRITT LIMITED Blackburn Lancashire BB2 2SZ (GB)	(72) Inventor: LORD, Richard, Thomas, Geoffrey Bamber Bridge Preston, Lancashire (GB)