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Publication numberUS3554862 A
Publication typeGrant
Publication date12 Jan 1971
Filing date25 Jun 1968
Priority date25 Jun 1968
Also published asDE6925092U, US3554863
Publication numberUS 3554862 A, US 3554862A, US-A-3554862, US3554862 A, US3554862A
InventorsDonald K George, Laurence R B Hervey
Original AssigneeRiegel Textile Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method for producing a fiber pulp sheet by impregnation with a long chain cationic debonding agent
US 3554862 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

United States Patent-O 3,554,862 METHOD FOR PRODUCING A FIBER PULP SHEET BY HVIPREGNATION WITH A LONG CHAIN CATIONIC DEBONDING AGENT Laurence R. B. Hervey, West Concord, Mass., and Donald K. George, Greenwood, S.C., assignors, by direct and mesne assignments, to Riegel Textile Corporation, Ware Shoals, S.C., a corporation of Delaware No Drawing. Filed June 25, 1968, Ser. No. 739,641 The portion of the term of the patent subsequent to Aug. 6, 1985, has been disclaimed Int. Cl. D21d 3/00 US. Cl. 162158 2 Claims ABSTRACT OF THE DISCLOSURE In a method of producing from cellulose fiber pulp, a pulp sheet, the improvement of impregnating the pulp with about 0.1% to 5.0% based on the weight of the dry pulp, of a cationic long chain fatty alkyl compound debonding agent having at least 12 carbon atoms in at least one alkyl chain such as dihydrogenated dimethyl ammonium chloride derived from a tallow oil, and forming a sheet from the impregnated pulp that can be easily mechanically fiberized.

In accordance with this invention, it has been discovered that an otherwise conventional pulp sheet or board formed on a conventional paper machine of the cylinder or Fourdrinier type andwhich is normally diflicult to fiberize, may be rendered exceedingly easy to fiberize (by mechanical action) if the pulp sheet or furnish for same is impregnated with certain types of chemical compounds, discussed below. We have found that these particular types of chemicals are unusually and markedly effective in debonding the pulp or pulp sheets treated therewith such that when the pulp sheet is dried and subjected to mechanical abrasive action, the fibers composing the sheet will substantially completely separate and produce a very fluffy, fibrous material. The loftiness of this material is 33 /a% or higher than the same type of material which has not been chemically treated before being subjected to the fiberizing operation.

It appears that the selected highly effective chemicals function to eliminate or break down the usual bond that exists between the fibers and thereby act as a debonding agent. The evidence of this debonding elfect is shown by the tensile strength of the treated pulp sheet which is only about one-third to one-fourth of the tensile strength of the same sheet untreated. For example, the treated sheet may typically have a tensile strength of about 2 pounds per inch for a sheet having a basis weight of 80 pounds per 3000 square feet in contrast with the untreated sheet which will typically have a tensile strength of 6 to 8 pounds per square inch.

The chemicals which we have found effective for obtaining this markedly lower tensile strength of the pulp sheet, comparable ease of debonding by mechanical action and comparable increase in loftiness of the fiberized material, may be generically classified as cationic long chain fatty alkyl compounds having at least 12 car 'bon atoms at least one alkyl chain. One of the important characteristics of these compounds is their cationic nature which attracts them chemically to the anionic fibers. It also appears that the highly eflicient debonding action of these chemicals is allied with long chain fatty type chemical compounds. Also, from the standpoint of eifective debonding, it is important that these chemical compounds have at least 12 carbon atoms in the alkyl 3,554,862 Patented Jan. 12, 1971 chain or in at least one of the alkyl chains if a dialkyl type compound is used.

The effective chemicals may also be classified subgenerically into the following groups, quaternary compounds tertiary, secondary and primary amine salts, Some of the quaternary compounds have been found more advantageous than some of the amines from the standpoint of lowering the tensile strength of the sheet from the usual 6, 7' or 8 pounds per inch down to 2 or 3 pounds per inch. However, a number of the primary amines of the long chain type having about 16, 18 or more carbon atoms have proven very effective for debonding purposes.

Illustrative but nonlimiting examples of the chemicals in the above mentioned four categories are as follows:

Quaternarymono cottonseed oil trimethyl ammonium chloride mono coco trimethyl ammonoium chloride mono stearyl trimethyl ammonium chloride mono oleyl trimethyl ammonium chloride mono soya trimethyl ammonium chloride dilauryl dimethyl ammonium chloride di hydrogenated dimethyl ammonium chloride derived from a tallow oil dimethyl ammonium chloride derived from soya oil N-alkyl (C dimethyl benzyl ammonium chloride coco dimethyl benzyl ammonium chloride Tertiary-mono stearyl dimethyl amine chloride Secondarydi coco amine chloride di hydrogenated tallow amine chloride di oleyl amine chloride Primarydodecylamine chloride palmitylamine chloride coco amine chloride coco amine acetate stearyl amine chloride stearyl amine acetate oleyl amine chloride oleyl amine acetate soya amine chloride tallow amine chloride Any one or more of the selected chemicals above identified may be introduced into the pulp or pulp sheet at a number of different places or steps in commercial pulp sheet forming operations. For example, the chemicals may be added to the pulp slurry contained in a stock chest prior to the paper or paperboard machine and this is of advantage where it is desired to permit the chemical to remain in contact with the cellulose fibers for some period of time, e.g., 5-10 minutes, before the slurry is fed to the paper machine. Where prolonged contact with the slurry prior to sheet formation is not necessary or desired, the chemical may be added at the head box of the paper machine.

Depending upon the type of paper or board making machinery used, the desired speed of operation, and the desired degree of impregnation of the fibers with the chemicals, the chemicals may be introduced into the sheet at the wet press section of the paper machine by suitable conventional equipment, such as a size press or the like. At this point, the chemical will be introduced into the previously-formed pulp sheet or board while it is still relatively wet, and before the sheet or board is finally dried on the machine.

A suitable type of Fourdrinier paper machine and the process of forming paper thereon is disclosed in G. L. Bedwell Pat. No. 2,488,700, issued Nov. 22, 1949; and a suitable type of cylinder machine is disclosed in Jacob Edge Pat. No. 2,005,839, issued June 25, 1935. And reference may be had to those patents for disclosures of paper machines and processes of operation suitable for use in the present invention.

The amount of chemical or chemicals to be added to the pulp furnish, slurry, or pulp sheet may vary substantially with the type of pulp used and the desired extent of debonding property. Usually, the amount will range between 0.1% to 5.0% by weight based on the dry pulp and in most cases, the chemicals are highly effective at the lower end of this range in amounts less than 1.0%.

The present invention is applicable to practically all conventional types of pulps made in conventional manner by the well-known kraft, soda, sulfite, or neutral sulfite processes.

The raw material, that is, the fibers to be pulped, impregnated and sheeted in accordance with the present invention, may be any one or more of the various types of pulp materials commercially used in paper and paperboard manufacture. Illustrative examples are wood, cotton linters, flax, hemp, ramie, bagasse, and esparto fiber pulps. Generally speaking, it is desirable to use relatively long fiber material for ultimate individual fiber strength and for high resistance to breaking, powdering or dusting when subjected to the fiberizing treatment.

After incorporation of the chemicals in the pulp sheet or board at any of the desired points mentioned above, the formed and impregnated wet sheet is then passed over conventional drying cylinders normally used in a paper machine to provide a fairly dense substantially dried, e.g., moisture of about 5%l0% by weight, sheet which may typically have a thickness of about /m-A? of an inch, and the dried sheet wound in a conventional manner on rolls for storage or shipment and ultimately for fiberizing by mechanical action to produce the abovedescribed lofty fluffy fiberized material. The final fiulfy material may be used for any desired purposes such as, for example, in diapers, napkins or other sanitary products, or for bulking or padding purposes, particularly where a lofty material is needed. The lofty fiberized properties of this material are also of advantage from the standpoint of efiiciency of absorption of body fluids.

Various modifications may be made in the abovedescribed materials, chemicals, process conditions, etc., without departing from the scope of this invention as set forth in the appended claims.

We claim:

1. In a method of producing from cellulose fiber pulp. a pulp sheet for fiberizing by mechanical action to form a fiuffy material; the improvement of impregnating the pulp with less than 1.0% based on the weight of the dry pulp, of a cationic long chain fatty alkyl compound debonding agent having at least 12 carbon atoms in at least one alkyl chain, and forming a sheet from the impregnated pulp that can be easily mechanically fiberized.

2. In a method of producing from cellulose fiber pulp, a pulp sheet for fiberizing by mechanical action to form a fiuffy material; the improvement of impregnating the pulp with less than 1.0% based on the weight of the dry pulp, of a cationic long chain fatty alkyl compound debonding agent having at least 12 carbon atoms in at least one alkyl chain, and selected from the class of chemicals consisting of quaternary compounds, tertiary, secondary and primary amine salts, and forming a sheet from the impregnated pulp that can be easily mechanically fiberized.

References Cited UNITED STATES PATENTS 7/1954 Reynolds 162-158 8/1968 Hervey 162179 S. LEON BASHORE, Primary Examiner R. H. ANDERSON, Assistant Examiner

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Classifications
U.S. Classification162/158, 604/375, 162/179, 162/204
International ClassificationD21C9/00, D21C9/02, D04H1/42, A61F13/15, D21H17/07
Cooperative ClassificationD21C9/005, D21H17/07, A61F13/534, A61F13/47, A61F13/53409, D04H1/42, A61F2013/530131
European ClassificationA61F13/47, D21H17/07, D21C9/00B2D, D04H1/42
Legal Events
DateCodeEventDescription
11 Oct 1985ASAssignment
Owner name: GEORGIA PACIFIC CORPORATION, 133 PEACHTREE STREET,
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RIEGELTEXTILE CORPORATION, A CORP. OF DE.;REEL/FRAME:004474/0616
Effective date: 19850930