公开(公告)号：NO20014122D0

公开(公告)日：2001-08-24

申请号：NO20014122

申请日：2001-08-24

Applicant: AHLSTROM GLASSFIBRE OY

Inventor： ROEKMAN KAY ,  JANSSON JUHANI

IPC: D21F1/00 ,  D21F11/00 ,  D21F

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.

公开(公告)号：NO20004666D0

公开(公告)日：2000-09-19

申请号：NO20004666

申请日：2000-09-19

Applicant: AHLSTROM GLASSFIBRE OY

Inventor： ROEKMAN KAY ,  SABEL HOKAN

IPC: B32B5/26 ,  B29C70/12 ,  B32B17/02 ,  D04H1/42 ,  D21H13/26 ,  D21H17/36 ,  D21H17/52 ,  H05K1/03 ,  H05K3/02 ,  D04H

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.

公开(公告)号：FI973740A0

公开(公告)日：1997-09-22

申请号：FI973740

申请日：1997-09-22

Applicant: AHLSTROM GLASSFIBRE OY

Inventor： ROEKMAN KAY ,  JANSSON JUHANI

IPC: D04H1/40 ,  C03B20060101 ,  D04H1/00 ,  D04H1/70 ,  D04H3/08 ,  D04H11/04 ,  C03B