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公开(公告)号：DE69825462T2
公开(公告)日：2005-08-04
申请号：DE69825462
申请日：1998-09-03
Applicant: AHLSTROM GLASSFIBRE OY KARHULA
Inventor： JANSSON JUHANI , ROEKMAN KAY
Abstract: In a foam laid process for producing a non-woven web of fibrous material (such as of synthetic or cellulose fibers) substantially fiber free foam is introduced at various locations in or adjacent to a headbox to get improved results. By introducing pure foam into the foam-fiber mixture near (e.g. just before) where the foam-fiber mixture is introduced into the headbox a more uniform basis weight profile of the non-woven web produced may be provided (e.g. a basis weight variation of about 0.5% or less). By introducing another stream of substantially fiber free foam into the headbox at a surface remote from the foraminous element, to flow along the surface (typically parallel to the flow of the foam fiber mixture), it is possible to minimize shear of fibers in the headbox so that the fibers do not become unidirectional, in the direction of movement of the foraminous element, and keep the surface clean. The surface is typically a roof surface of an inclined headbox.
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公开(公告)号：DE69825462D1
公开(公告)日：2004-09-09
申请号：DE69825462
申请日：1998-09-03
Applicant: AHLSTROM GLASSFIBRE OY KARHULA
Inventor： JANSSON JUHANI , ROEKMAN KAY
Abstract: In a foam laid process for producing a non-woven web of fibrous material (such as of synthetic or cellulose fibers) substantially fiber free foam is introduced at various locations in or adjacent to a headbox to get improved results. By introducing pure foam into the foam-fiber mixture near (e.g. just before) where the foam-fiber mixture is introduced into the headbox a more uniform basis weight profile of the non-woven web produced may be provided (e.g. a basis weight variation of about 0.5% or less). By introducing another stream of substantially fiber free foam into the headbox at a surface remote from the foraminous element, to flow along the surface (typically parallel to the flow of the foam fiber mixture), it is possible to minimize shear of fibers in the headbox so that the fibers do not become unidirectional, in the direction of movement of the foraminous element, and keep the surface clean. The surface is typically a roof surface of an inclined headbox.
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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
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).
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公开(公告)号：CA2439350A1
公开(公告)日：2002-09-06
申请号：CA2439350
申请日：2002-02-15
Applicant: AHLSTROM GLASSFIBRE OY
Inventor： LAINE EINO , ROEKMAN KAY , GROSSO ANDREA , GEORGE JONATHAN , RAHIALA HANNA
IPC: B29C39/16 , B29K105/04 , B29K105/08 , B29L31/14 , D21F11/00 , D04H1/00 , D21J3/00
Abstract: Disclosed is a method of producing a non-woven web of fibrous or particulate material comprising: formation of a foam slurry; deposition of that slurry onto a foraminous element having a three-dimensional mold; and formation of a web having a three-dimensional shape that is not substantially planar by removal of foam from the slurry through the foraminous element and drying th e web. An apparatus therefor is also disclosed. The method may be used in production a variety of products, including automotive pleated fluid and air filters, pleated heating and/or air conditioning (HVAC) filters, shaped breathing mask filters and bacterial filters, laminated cleaning products wi th super-absorbent middle layers, such as a mop wipe shape to fit a cleaning mo p head, and other products.
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公开(公告)号：FI20021358A0
公开(公告)日：2002-07-10
申请号：FI20021358
申请日：2002-07-10
Applicant: AHLSTROM OYJ , AHLSTROM GLASSFIBRE OY
Inventor： ROEKMAN KAY
IPC: B01J20060101 , B01J35/00 , B01J
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Patent Agency Ranking
公开(公告)号：BR9908950A
公开(公告)日：2000-11-21
申请号：BR9908950
申请日：1999-03-19
Applicant: AHLSTROM GLASSFIBRE OY
Inventor： ROEKMAN KAY , SABEL HAKAN
IPC: B32B5/26 , B29C70/12 , B32B17/02 , D04H1/42 , D21H13/26 , D21H17/36 , D21H17/52 , H05K1/03 , H05K3/02
Abstract: A printed circuit board is made from at least one non-woven sheet or web layer comprising at least 10 % weight aramid fibers, with any balance substantially electrically non-conductive fibers, filler, and binder. The sheet or web is preferably made by the foam process, and at least about 10 % (e.g. at least about 60 %) of the aramid fibers utilized are aramid pulp fibers which have a number of advantages compared to the conventional straight aramid fibers. The web or sheet is preferably compressed so that it has a density of about 0.1-0.2 grams per cubic. centimeter; and the web or sheet has a basis weight of between about 20-120 grams per square meter. The web may also have a substantially electrically non-conductive binder such as PVA or an epoxy resin. A printed circuit board made using the aramid layers of non-woven webs or sheets is otherwise conventional, including a pre-preg material, electrically conductive circuit elements, and electronics.
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公开(公告)号：FI973740A
公开(公告)日：1999-03-05
申请号：FI973740
申请日：1997-09-22
Applicant: AHLSTROM GLASSFIBRE OY
Inventor： ROEKMAN KAY , JANSSON JUHANI
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公开(公告)号：DE60219958T2
公开(公告)日：2008-01-17
申请号：DE60219958
申请日：2002-11-07
Applicant: AHLSTROM GLASSFIBRE OY
Inventor： BLOMQVIST RAINER , KOSTAMO HARRI , LAINE EINO , ROEKMAN KAY
Abstract: The present invention relates to a method and apparatus for foam forming, wherein fibrous foam suspension is introduced from the head box ( 78, 178 ) of a production machine to the web forming section thereof. At least one solid material is mixed into the foam in the head box ( 78, 178 ). The method and the apparatus of the invention are particularly suitable for manufacturing various web-like products of cellulose, glass fiber, aramide, sisal, or other corresponding fibre material.
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公开(公告)号：DE60219958D1
公开(公告)日：2007-06-14
申请号：DE60219958
申请日：2002-11-07
Applicant: AHLSTROM GLASSFIBRE OY
Inventor： BLOMQVIST RAINER , KOSTAMO HARRI , LAINE EINO , ROEKMAN KAY
Abstract: The present invention relates to a method and apparatus for foam forming, wherein fibrous foam suspension is introduced from the head box ( 78, 178 ) of a production machine to the web forming section thereof. At least one solid material is mixed into the foam in the head box ( 78, 178 ). The method and the apparatus of the invention are particularly suitable for manufacturing various web-like products of cellulose, glass fiber, aramide, sisal, or other corresponding fibre material.
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公开(公告)号：AT361392T
公开(公告)日：2007-05-15
申请号：AT02774805
申请日：2002-11-07
Applicant: AHLSTROM GLASSFIBRE OY
Inventor： BLOMQVIST RAINER , KOSTAMO HARRI , LAINE EINO , ROEKMAN KAY
Abstract: The present invention relates to a method and apparatus for foam forming, wherein fibrous foam suspension is introduced from the head box ( 78, 178 ) of a production machine to the web forming section thereof. At least one solid material is mixed into the foam in the head box ( 78, 178 ). The method and the apparatus of the invention are particularly suitable for manufacturing various web-like products of cellulose, glass fiber, aramide, sisal, or other corresponding fibre material.
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