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    41.
    发明专利
    未知

    公开(公告)号：BR0008551A

    公开(公告)日：2002-01-15

    申请号：BR0008551

    申请日：2000-02-24

    Applicant: AHLSTROM GLASSFIBRE OY

    Inventor： ROEKMAN KAY ,  JANSSON JUHANI

    IPC: D21F1/00 ,  D21F11/00

    Abstract: A nonwoven web of fibrous material is made by the foam process using a manifold of a particular construction. The manifold has a casing with first and second opposite ends including an inlet for a foam-fiber-surfactant slurry at the first end, and optionally a valved outlet at the second end. A center section of the manifold casing has a (e.g. rectangular) cross-section that becomes smaller moving from an inlet toward the outlet. First and second substantially closed side walls, a porous front wall having an effective length, and a back wall opposite the front wall, are provided for the center section, the walls planar or curved. Any suitable structures are provided for introducing a second (e.g. substantially fiber-free, or a fiber-foam slurry) foam into the center section through the back wall. Pressure sensors penetrating one or both of the side walls may sense the pressure within the center section, and automatically control the introduction of slurry into the inlet, withdrawal through the outlet, and/or introduction of the second foam into/through the back wall, so as to maintain the basis weight of the foam-fiber slurry passing through the front wall substantially constant along the effective length of the front wall.

    METHOD AND APPARATUS FOR FOAM FORMING
    43.
    发明专利
    METHOD AND APPARATUS FOR FOAM FORMING 未知

    公开(公告)号：CA2466576C

    公开(公告)日：2009-07-07

    申请号：CA2466576

    申请日：2002-11-07

    Applicant: AHLSTROM GLASSFIBRE OY

    Inventor： ROEKMAN KAY ,  BLOMQVIST RAINER ,  KOSTAMO HARRI ,  LAINE EINO

    IPC: D21F1/02 ,  D21F11/00 ,  D21F11/02 ,  D21H27/30

    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 th e apparatus of the invention are particularly suitable for manufacturing vario us web-like products of cellulose, glass fibre, aramide, sisal, or other corresponding fibre material.

    45.
    发明专利
    未知

    公开(公告)号：FI115512B

    公开(公告)日：2005-05-31

    申请号：FI20012168

    申请日：2001-11-09

    Applicant: AHLSTROM GLASSFIBRE OY

    Inventor： BLOMQVIST RAINER ,  LAINE EINO ,  KOSTAMO HARRI ,  ROEKMAN KAY

    IPC: D21F1/02 ,  D21F11/00 ,  D21F11/02 ,  D21H27/30 ,  B29C70/00 ,  B29D7/00 ,  B29D9/00

    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.

    47.
    发明专利
    未知

    公开(公告)号：AT272743T

    公开(公告)日：2004-08-15

    申请号：AT98942705

    申请日：1998-09-03

    Applicant: AHLSTROM GLASSFIBRE OY

    Inventor： JANSSON JUHANI ,  ROEKMAN KAY

    IPC: D21F1/02 ,  D21F1/08 ,  D21F11/00

    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.

    48.
    发明专利
    未知

    公开(公告)号：AT263276T

    公开(公告)日：2004-04-15

    申请号：AT00907685

    申请日：2000-02-24

    Applicant: AHLSTROM GLASSFIBRE OY

    Inventor： ROEKMAN KAY ,  JANSSON JUHANI

    IPC: D21F1/00 ,  D21F11/00

    Abstract: A nonwoven web of fibrous material is made by the foam process using a manifold of a particular construction. The manifold has a casing with first and second opposite ends including an inlet for a foam-fiber-surfactant slurry at the first end, and optionally a valved outlet at the second end. A center section of the manifold casing has a (e.g. rectangular) cross-section that becomes smaller moving from an inlet toward the outlet. First and second substantially closed side walls, a porous front wall having an effective length, and a back wall opposite the front wall, are provided for the center section, the walls planar or curved. Any suitable structures are provided for introducing a second (e.g. substantially fiber-free, or a fiber-foam slurry) foam into the center section through the back wall. Pressure sensors penetrating one or both of the side walls may sense the pressure within the center section, and automatically control the introduction of slurry into the inlet, withdrawal through the outlet, and/or introduction of the second foam into/through the back wall, so as to maintain the basis weight of the foam-fiber slurry passing through the front wall substantially constant along the effective length of the front wall.

    49.
    发明专利
    未知

    公开(公告)号：NO20021375L

    公开(公告)日：2002-05-21

    申请号：NO20021375

    申请日：2002-03-20

    Applicant: AHLSTROM GLASSFIBRE OY

    Inventor： KOMLENIC ROD ,  RENNELS KELLY ,  ROEKMAN KAY ,  SABEL HAAKAN

    IPC: D04H1/42 ,  B32B5/28 ,  C08J5/04 ,  C08J5/24 ,  D21F11/00 ,  D21H13/18 ,  D21H13/22 ,  D21H13/24 ,  D21H13/26 ,  D21H13/40 ,  D21H25/00 ,  D21H25/04 ,  D21H25/06 ,  H05K1/03

    Abstract: A printed circuit board is made from at least one non-woven sheet or web layer comprising at least 50% by weight acrylic fibers, with any balance substantially electrically non-conductive fibers, filler, and binder. The sheet or web is preferably made by the foam process, and may contain 60-80% straight polyacrylonitrile fibers and 40-20% fibrillated (pulp) ones. The web or sheet is preferably compressed by thermal calendering so that it has a density of about 0.1-1 grams per cubic centimeter; and the web or sheet may have a basis weight of between about 20-120 grams per square meter. The web or sheet may also have a 1-40% of substantially electrically non-conductive organic or inorganic binder, or may be substantially binder free. A printed circuit board made using the layers of these non-woven webs or sheets is otherwise conventional, including a pre-preg material, electrically conductive circuit elements, and electronics, and has improved properties compared to woven glass and non-woven aramid products, including improved fiber consolidation, easy board construction, and improved MD/CD ratio and stability.

    50.
    发明专利
    未知

    公开(公告)号：FI20012168A0

    公开(公告)日：2001-11-09

    申请号：FI20012168

    申请日：2001-11-09

    Applicant: AHLSTROM GLASSFIBRE OY

    Inventor： BLOMQVIST RAINER ,  LAINE EINO ,  KOSTAMO HARRI ,  ROEKMAN KAY

    IPC: D21F1/02 ,  D21F11/00 ,  D21F11/02 ,  D21H27/30 ,  B29C

    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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