IP Library › Patent Application 11188119
Patent Application
App. No. 11/188,119

Process and apparatus for making a sheet of aramid fibers using a foamed medium

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Quick Facts
Patent No.
US None
App. No.
11/188,119
Abstract

The present invention relates to a method for forming a non-woven fibrous web comprised of aramid fibers and aramid fibrid which comprises forming a foam furnish by agitating the fibers and fibrid in a foamed medium, and passing the foam furnish onto a screen and defoaming the furnish. In effectively agitating the aramid fibers in the foamed medium, the agitating means is mounted for displacement within the foamed medium and includes a convex leading surface facing in the direction of displacement. The leading surface includes upper and lower portions converging in the direction of displacement to form a generally convex leading surface and driving means for displacing the agitating means in the direction of displacement for dispersing and mutually separating the aramid fibers within the foamed medium.

Claims (13)

1 - 21 . (canceled)

22 . A non-woven, fibrous web prepared by a method comprising:

(i) forming a foam furnish by agitating aramid fibers in a foamed medium, the furnish also containing aramid fibrid, with an apparatus comprising agitating means mounted for displacement within the foamed medium and including a leading surface facing in a direction of displacement, the leading surface including upper and lower portions converging in the direction of displacement to form a generally convex leading surface: and driving means for displacing the agitating means in the direction of displacement for dispersing and mutually separating the fibers within the foamed medium: and

(ii) passing the foam furnish onto a screen and defoaming the furnish to form the web with the web exhibiting substantially no fiber directionality.

23 . The non-woven web of claim 22 , wherein the amount of fibrid comprises 30% or less by weight of the web.

24 . The non-woven web of claim 22 , wherein the amount of fibrid comprises 25% or less by weight of the web.

25 . (canceled)

26 . (canceled)

27 . The non-woven web of claim 22 , wherein the aramid fibers are comprised of fibers at least one inch in length.

28 . The non-woven web of claim 22 , wherein the aramid fibers are comprised of fibers at least one and one-half inch in length.

29 . The non-woven web of claim 22 , wherein the web is further comprised of synthetic and/or metal fibers.

30 . The non-woven web of claim 22 , wherein the web is further comprised of cellulosic fibers.

31 . The non-woven web of claim 22 , wherein the web is further comprised of inorganic fibers.

Assignments (5)
RELEASE OF SECURITY INTEREST Recorded Aug 5, 2015
From: GENERAL ELECTRIC CAPITAL CORPORATION
To: FIBERMARK NORTH AMERICA, INC.
Reel/Frame 036256/0160 →
TERMINATION AND RELEASE OF THIRD AMENDED AND RESTATED PATENT SECURITY AGREEMENT Recorded Jan 2, 2008
From: GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT
To: FIBERMARK HOLDINGS, LLC; FIBERMARK NORTH AMERICA, INC.
Reel/Frame 020309/0150 →
SECURITY AGREEMENT Recorded Dec 28, 2007
From: FIBERMARK NORTH AMERICA, INC.
To: GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT
Reel/Frame 020299/0363 →
THIRD AMENDED AND RESTATED PATENT SECURITY AGREEMENT Recorded Dec 13, 2006
From: FIBERMARK HOLDINGS, LLC; FIBERMARK NORTH AMERICA, INC.
To: GENERAL ELECTRIC CAPITAL CORPORATION, AS AGENT
Reel/Frame 018616/0690 →
INTELLECTUAL PROPERTY ASSIGNMENT Recorded Dec 7, 2006
From: FIBERMARK, INC.
To: FIBERMARK NORTH AMERICA, INC.
Reel/Frame 018597/0030 →