公开(公告)号：DE69719380D1

公开(公告)日：2003-04-03

申请号：DE69719380

申请日：1997-12-18

Applicant: AHLSTROM GLASSFIBRE OY KARHULA

Inventor： ELONEN JORMA ,  JANSSON JUHANI ,  KOSO ARTO ,  ROEKMAN KAY

IPC: D04H1/70 ,  B01D19/00 ,  D21F11/00

Abstract: 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 Substantially fiber-free foam is withdrawn from the foraminous element while forming a non-woven web of fibrous material on the foraminous element, and at least a part of the substantially fiber-free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).

公开(公告)号：DE69719380T2

公开(公告)日：2003-10-23

申请号：DE69719380

申请日：1997-12-18

Applicant: AHLSTROM GLASSFIBRE OY KARHULA

Inventor： ELONEN JORMA ,  JANSSON JUHANI ,  KOSO ARTO ,  ROEKMAN KAY

IPC: D04H1/70 ,  B01D19/00 ,  D21F11/00

Abstract: 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 Substantially fiber-free foam is withdrawn from the foraminous element while forming a non-woven web of fibrous material on the foraminous element, and at least a part of the substantially fiber-free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).