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Saccharide treated cellulose pulp sheets

a cellulose and cellulose technology, applied in the field of cellulose fibers, can solve the problems of difficult fiberization of fibers, difficult processing of binder coated fibers, and limited search for desirable treatment chemicals, and achieve the effects of low cost, superior densification and softness properties, and reduced production costs

Inactive Publication Date: 2005-01-06
WEYERHAEUSER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Surprisingly, the present inventors have observed that cellulose pulp sheets treated with a saccharide in accordance with the present invention are readily fiberizable within the requirements of absorbent product manufacturers. Fibers resulting from the fiberization of cellulose pulp sheets treated with saccharides in accordance with the present invention exhibit densification and softness properties that are superior to densification and softness properties of fibers resulting from cellulose pulp sheets that have not been treated in accordance with the present invention. Absorbent product manufacturers will find saccharide treated cellulose pulp sheets desirable because of their fiberization properties and the densification and softness properties of the fibers produced from the treated pulp sheets. In addition, absorbent product manufacturers will consider saccharides desirable because of their low cost and perceived safety by the consuming public and the absence of any negative perception.
The present invention provides absorbent product manufacturers with a source of cellulose pulp sheets that exhibit desirable fiberization properties resulting in fibers that exhibit desirable densification and softness properties.

Problems solved by technology

Several challenges are faced by absorbent product manufacturers when producing products from the treated cellulose fibers discussed above.
The search for desirable treatment chemicals is limited by the need of the industry to use chemicals which are safe and which are not susceptible to a negative perception by the consuming public.
U.S. Pat. No. 5,789,326 also describes that such tacky binders make processing of binder coated fibers difficult, e.g., the application of neat corn syrup to cellulose fibers makes the fibers more difficult to fiberize.
Poorly fiberized cellulose fibers airlaid into webs are less desirable compared to airlaid webs of fibers that are fiberized to a greater extent.
Heretofore, corn syrup has not found use in the manufacture of customized cellulose fibers which have been treated to modify their properties, despite the favorable economics of using corn syrup.

Method used

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  • Saccharide treated cellulose pulp sheets
  • Saccharide treated cellulose pulp sheets
  • Saccharide treated cellulose pulp sheets

Examples

Experimental program
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Effect test

example 1

Preparation of High Fructose Corn Syrup Treated Cellulose Pulp

Southern Pine fluff in sheet form available from Weyerhaeuser Company under the designation NB 416 from New Bern, N.C. with a starting moisture content of 6% by weight (based on total sheet weight) was coated in a Black Brothers gravure-type roll coater with a solution of corn syrup. The gravure coater results in the application of a uniform coating of the corn syrup solution over one entire surface of the pulp sheet from where it is rapidly soaked up by the sheet. The corn syrup was a high fructose corn syrup available from Archer-Daniels Midland Company of Decatur, Ill. under the trademark CORN SWEET® 42. The corn syrup had a solids content of 71% with the balance being water. This corn syrup was diluted with water to a solid content of 54.5 wt. % based on total solution weight before its application to the wood pulp sheet. This 54.5 wt. % solution was applied to the wood pulp sheet at a rate of 15.5 parts solution to...

example 2

Preparation of High Fructose Corn Syrup Treated Cellulose Pulp Sheet Using Diluted Corn Syrup

The procedure in Example 1 was reproduced except that the CORN SWEET® 42 corn syrup was diluted to a solids content of 52.2 wt. % based on total solution weight using water. 10.58 parts of the corn syrup solution were added to 100 parts of the NB 416 wood pulp cellulose sheet. This resulted in a loading of active (on a dry basis) corn syrup solids of 5.88 wt. % based on the dry fiber content (or an equivalent 5.0 wt. % corn syrup solid based on the total final product weight). The final total moisture content of the wood pulp sheet treated with corn syrup was 10 wt. % based on the total final product weight. Knot yield after fiberization was 16% for the above sample.

example 3

Preparation of High Fructose Corn Syrup Treated Cellulose Pulp Sheet Treated With Heat

An additional sample of the corn syrup treated wood pulp of Example 1 was further evaluated on a Fitz Hammermill feeding an M&J continuous airlaid pad forming device. A portion of the corn syrup treated pulp sheet of Example 1 was first run as-is on the Fitz Hammermill. The resultant fiberized pulp was collected. The remaining portions of the treated pulp sheet were sealed inside plastic bags double layered to prevent moisture loss and heated for 24 hours at 150° F. in a laboratory oven. After heat treatment, the pulp sheet was allowed to cool back to room temperature while still in the plastic bags and was then fiberized on the Fitz Hammermill under the same conditions used for the non-heat-treated pulp. Both heated and non-heated pulps were tested for knot content by the sonic method described above. The knot content of the two samples was similar; however, the physical appearance of the pulp w...

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Abstract

Cellulose pulp sheets treated with a saccharide yield less than 20 wt. % knots when fiberized under standard Kamas conditions. The fiberized sheets when airlaid produce fiber webs that exhibit desirable densification properties and softness properties.

Description

FIELD OF THE INVENTION The present invention relates to cellulose fibers that have been treated with a saccharide in order to modify the properties of the cellulose fibers and to methods for applying saccharides to cellulose fibers. BACKGROUND OF THE INVENTION Cellulose fibers have found widespread application in absorbent articles, such as diapers and feminine hygiene products. The cellulose fibers are generally used as an absorbent medium to acquire, transport, and hold fluids. While cellulose fibers are effective at acquiring, transporting, and holding fluids, many improvements to cellulose fibers have been made over the past decades to improve the performance properties of cellulose fibers in absorbent products. For example, U.S. Pat. Nos. 6,340,411 and 5,547,541 describe that webs of cellulose fibers treated with certain polymeric and nonpolymeric materials require less pressure to densify the web to a given density as compared to the pressure needed to densify a similar web ...

Claims

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Application Information

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IPC IPC(8): A61F13/15A61L15/20A61L15/28D21C9/00
CPCA61F13/53A61F2013/530007A61L15/20A61L15/28D21C9/005C08L1/02
Inventor WEST, HUGH
Owner WEYERHAEUSER CO
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