D - Textiles – Paper – 04 – H
Patent
D - Textiles, Paper
04
H
19/3
D04H 1/72 (2006.01) A61F 13/00 (2006.01) A61F 13/15 (2006.01)
Patent
CA 1317736
APPARATUS FOR AND METHODS OF AIRLAYING FIBROUS WEBS HAVING DISCRETE PARTICLES THEREIN ABSTRACT Apparatus for and methods of forming airlaid fibrous webs having a multiplicity of layers and/or discrete particles of absorbent gelling material dispersed through at least a portion of the web. The apparatus is of the type which includes an airlaying means such as a laydown drum having a foraminous forming element; a first or primary deposition means for directing a first or primary stream of air-entrained fibers to the laydown drum; a first or primary hood; a dusting layer deposition means for directing a dusting layer stream of air-entrained fibers to the laydown drum wherein the dusting layer stream is deposited onto the laydown drum prior to depositing the first or primary stream on the laydown and a dusting layer hood. The dusting layers acts to block the passage of particles or fibers entrained in the first fiber stream so as to minimize equipment plugging problems and the loss of particles or fibers through the foraminous forming element. In addition, the first vacuum chamber in the laydown drum spans the first hood and a portion of the dusting layer hood so that the dusting layer is not sheared off, damaged, or destroyed as the laydown drum rotates to the position where the first fiber stream is deposited over the dusting layer. The method preferably comprises the steps of: a. providing multiplicity of streams of air-entrained fibers; b. directing a dusting layer stream of air-entrained fibers to an airlaying means: c. forming a dusting layer on the airlaying means from the dusting layer stream of air-entrained fibers, d. directing a first stream of air-entrained fibers to the airlaying means; e. forming a first layer over the dusting layer on the airlaying means from the first stream of air-entrained fibers.
537856
Sim & Mcburney
The Procter & Gamble Company
LandOfFree
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