Method and apparatus for adding minute fibers etc. at press section of a paper machine

(19)

(11)

EP 0 881 329 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	21.07.1999 Bulletin 1999/29

(43)	Date of publication A2:
	02.12.1998 Bulletin 1998/49

(21)	Application number: 98303888.6

(22)	Date of filing: 18.05.1998

(51)	International Patent Classification (IPC)⁶: D21F 7/00, D21F 3/00, D21H 23/56, D21H 23/78

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

30.05.1997 JP 141224/97

(71)	Applicant: Mitsubishi Heavy Industries, Ltd.
	Tokyo (JP)

(72)	Inventors:
	Izawa, Akimine, c/o Mitsubishi Heavy Ind., Ltd. Nishi-ku, Hiroshima-shi, Hiroshima-ken (JP) Hasuike, Makio, c/o Mitsubishi Heavy Ind., Ltd. Nishi-ku, Hiroshima-shi, Hiroshima-ken (JP)

(74)	Representative: Goddard, David John et al
	HARRISON GODDARD FOOTE 1 Stockport Road Marple Stockport SK6 6BD Stockport SK6 6BD (GB)

(54)	Method and apparatus for adding minute fibers etc. at press section of a paper machine

(57) After a film of a minute fiber suspension is formed on the surface of an applicator roll 22 disposed at a press section of a paper machine, the suspension is applied to at least one surface of a wet paper web 4. The weight concentration of minute fibers in the suspension used is set at 3.0 to 5.0%, the amount of minute fibers applied to the surface of wet paper is set at 0.2 to 2.0 g/m² per one surface of the wet surface 4, and the amount of paper strength increasing agent is set at 0.5 to 2.0 g/m² per one surface of the wet surface 4. A paper strength increasing agent may be mixed with the suspension of minute fibers prior to forming the film on the roll 22.

Search report