Ahlstrom Glassfibre Oy

A. Ahlstrom Corporation

Sulzer Pumpen Ag

Ahlstrom Machinery Oy

Metsa-botnia Ab Joutseno Pulp

Arto Koso

Kay Rokman

Juhani Jansson

Jorma Elonen

Reijo Vesala

Olavi E Pikka

Heikki Manninen

Voitto Reponen

Esko Turunen

Seppo Pursiainen

Mauno Iivonen

A non-woven web of fibrous material is produced using a moving foraminous element in the practice of the foam process. A first foam slurry of air, water, fibers and a surfactant is generated and centrifugally pumped into contact with the moving foraminous element. Substantially fiber-free foam is withdrawn from the foraminous element while forming a non-woven web of fibrous material on the foraminous element, and at least a part of the substantially fiber-free foam is used in the generation of the first foam slurry. Recycling is also typically practiced using a centrifugal pump, and the centrifugal pumps are preferably degassing pumps which remove some of the gas from the foam. By practicing the invention it is possible to produce fibrous webs using the foam process that are more than two meters wide, and at a forming speed of more than about 100 m/min (e.g. about 200-500 m/min).

Using centrifugal pumps in the foam process of producing non-woven webs

Method and apparatus for mixing gas with liquid

A method and apparatus for improving a batch cooking process, e.g. providing about 7% increase in discharge time, are provided. The invention is especially suitable for improving modern displacement batch cooking processes. A dedicated pump is mounted directly to each digester and discharges to a common superatmospheric pressure discharge tank.

Method and apparatus for improving a batch cooking process

An apparatus for the discharge of a mass tower containing medium to high consistency pulp and operable without the need for further dilution includes a vessel for storing the pulp; a suction duct extending from a zone of moving pulp to a region outside of the tower; and a pump attached to the end of the suction duct for discharging the pulp.

Apparatus for the discharge of a mass tower

Growing community of inventors

Karhula, Finland

Arto Koso