(19)

(11)

EP 1 718 800 A1

(12)

(43) Date of publication: 08.11.2006 Bulletin 2006/45 (21) Application number: 05722644.1 (22) Date of filing: 31.01.2005

(51) International Patent Classification (IPC):  D21C 9/00(2006.01) (86) International application number: PCT/US2005/003079 (87) International publication number: WO 2005/080671 (01.09.2005 Gazette 2005/35)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR (30) Priority: 13.02.2004 US 778673 (71) Applicant: WEYERHAEUSER COMPANY Federal Way, WA 98009 (US)	(72) Inventors: WEST, Hugh Seattle, WA 98115 (US) HAJNAL, Andre, S. Anderson Island, WA 98303 (US) (74) Representative: Bayliss, Geoffrey Cyril et al BOULT WADE TENNANT, Verulam Gardens 70 Gray's Inn Road London WC1X 8BT London WC1X 8BT (GB)