Method of manufacturing unbonded, absorbent fibrous structures

Patent metadata

Field	Value
Publication number	US-9943446-B2
Application number	US-201615160112-A
Country	US
Kind code	B2
Filing date	May 20, 2016
Priority date	May 28, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

The present invention relates to a method of manufacturing an unbonded, absorbent, fibrous structure, the method comprising the steps of: a) providing of a first fibrous material in the form of a fibrous sheet ( 10 ); b) defiberizing the sheet ( 10 ) of first fibrous material to form a roughly graded material ( 16 ); c) mixing the roughly graded material ( 16 ) with a second material ( 26 ) to form a mixture; and d) air-laying the mixture on a foraminous carrier ( 50 ) to form the unbonded, absorbent, fibrous structure.

First claim

What is claimed is:

1. A method of manufacturing an unbonded, absorbent, fibrous structure, the method comprising the steps of:
providing a rotary toothed cutter comprising a first cutting zone and a second cutting zone;
advancing a first fibrous sheet into the first cutting zone by a first feeding device at a first feed rate to defiberize the first fibrous sheet and form first roughly graded material;
advancing a second fibrous sheet into the second cutting zone by a second feeding device at a second feed rate to defiberize the second fibrous sheet and form second roughly graded material, wherein the second feed rate varies sinusoidally with respect to time;
mixing the first roughly graded material with the second roughly graded material to form a mixture; and
air-laying the mixture on a foraminous carrier to form the unbonded, absorbent, fibrous structure.

2. The method of claim 1 , wherein the first feed rate is not equal to the second feed rate.

3. The method of claim 1 , wherein the first feed rate is a variable feed rate.

4. The method of claim 1 , wherein the first fibrous sheet has a bulk density in the range from about 0.1 to about 0.85 g/cm 3 .

5. The method of claim 1 , wherein the second fibrous sheet has a bulk density in the range from about 0.1 to about 0.85 g/cm 3 .

Assignees

• Procter & Gamble

Inventors

• Jackels Hans Adolf

Classifications

• A61F13/15617

  Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres · CPC title

• A61F13/15658 Primary

  Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof · CPC title

• D04H1/732

  by fluid current, e.g. air-lay · CPC title

• A61F13/15626

  Making fibrous pads without outer layers · CPC title