Patent ID: 6616802
Filing Date: 2003-09-09
Classification: D21B,D21F,D21H,H01M,Y02E,Y02P

Abstract:
A method for forming a non-woven fibrous web comprised of refractory fibers, which comprises:(i) forming a foam furnish by agitating refractory fibers in a foamed medium with an apparatus comprising agitating means mounted for displacement within the foamed medium, said agitating means comprising a leading surface facing in a direction of displacement and a trailing surface, with the leading surface including upper and lower portions converging in the direction of displacement to form a generally convex leading surface, and the trailing surface being concave; 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 thereby form the web.