(19)

(11)

EP 0 088 073 A1

(12)

(43) Date of publication: 14.09.1983 Bulletin 1983/37 (21) Application number: 81902539.0 (22) Date of filing: 04.09.1981

(51) International Patent Classification (IPC):  D21C 9/ 10( . ) (86) International application number: PCT/US1981/001186 (87) International publication number: WO 1983/000887 (17.03.1983 Gazette 1983/07)

(84) Designated Contracting States: AT DE FR SE (71) Applicant: WEYERHAEUSER COMPANY Tacoma, WA 98477 (US)	(72) Inventors: BENTVELZEN, Joseph M. Sumner, WA 98390 (US) CROSBY, Gerald D. Seattle, WA 98155 (US) TORREGROSSA, Louis O. Columbus, MS 39701 (US) (74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät  Maximilianstrasse 58 D-80538 München D-80538 München (DE)