(19)

(11)

EP 0 230 427 A1

(12)

(43) Date of publication: 05.08.1987 Bulletin 1987/32 (21) Application number: 86902213.0 (22) Date of filing: 21.03.1986

(51) International Patent Classification (IPC):  B01F 7/ 00( . ) B01F 5/ 00( . ) D21C 9/ 10( . ) (86) International application number: PCT/US1986/000575 (87) International publication number: WO 1987/000450 (29.01.1987 Gazette 1987/03)

(84) Designated Contracting States: AT DE FR SE (30) Priority: 22.07.1985 US 19850757583 (71) Applicant: WEYERHAEUSER COMPANY Tacoma, WA 98477 (US)	(72) Inventors: MEREDITH, Michael, Dean Tacoma, WA 98422 (US) BENTVELZEN, Joseph, Maria Sumner, WA 98390 (US) JORDAN, Marvin, Franklin Longview, WA 98632 (US)