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EP1769120A2 - Procede pour la formation de feuille de bourres de coton brut - Google Patents

Procede pour la formation de feuille de bourres de coton brut

Info

Publication number
EP1769120A2
EP1769120A2 EP05774719A EP05774719A EP1769120A2 EP 1769120 A2 EP1769120 A2 EP 1769120A2 EP 05774719 A EP05774719 A EP 05774719A EP 05774719 A EP05774719 A EP 05774719A EP 1769120 A2 EP1769120 A2 EP 1769120A2
Authority
EP
European Patent Office
Prior art keywords
cotton linters
raw cotton
sheet
water
mass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05774719A
Other languages
German (de)
English (en)
Inventor
Paul C. Gillette
Kenneth W. Peek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hercules LLC
Original Assignee
Hercules LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hercules LLC filed Critical Hercules LLC
Publication of EP1769120A2 publication Critical patent/EP1769120A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse

Definitions

  • This invention relates to a process for making raw cotton linters into sheet form and more particularly to a process for making raw cotton linters into sheet form that is substantially free of any extraneous chemicals. This invention also relates to the sheeted raw cotton linters composition prepared from the above process.
  • cellulose derivatives Prior to the present invention, manufacturers of cellulose derivatives have traditionally used highly purified cellulose furnishes derived from cotton linters or wood to make cellulose ethers. These materials are fabricated into rolls of paper sheets for ease of handling. The extensive purification of raw cotton linters to make purified cotton linters added cost and, in certain instances, created environmental problems.
  • the "steep press" cellulose ether production process involves initially subjecting purified cellulose to a highly concentrated aqueous caustic solution. After an appropriate period of time, the swollen mass is compressed in a manner that removes excess caustic solution where upon it is shredded. The resulting alkali cellulose is then mixed and reacted with desired cellulose derivative of interest. Use of stacked sheets of cellulose facilitates distribution of the caustic solution.
  • a common practice involves shredding the sheet prior to adding derivatizing reagents. Due to the inherent difficulty in attaining uniform alkalization as well as uniformly mixing the derivatizing reagents within the shredded alkali cellulose, the production of high quality derivatives is difficult by this process. Nevertheless this processing method provides a simple, relatively inexpensive means for producing cellulose ether derivatives.
  • the present invention is directed to a process for making a raw cotton linters matted sheet comprising a) dispersing a loose mass of raw cotton linters in water, b) removing a portion of the water from the dispersed loose mass, and c) pressing the wet loose mass of raw cotton linters into a resulting matted sheet.
  • the present invention is also related to the raw cotton linters composition that is prepared by the above-mentioned process.
  • raw cotton linters fabricated into a sheet serves as a raw material suitable for the production of high performance cellulose derivatives.
  • the resulting derivatives are especially well suited for demanding nonregulated applications such as paint, construction, and oil field.
  • Raw linters can be processed using conventional papermaking processes.
  • raw cotton linters are converted to sheet form using a conventional paper machine to provide a raw material especially well suited for the production of high performance cellulose derivatives.
  • sheet refers to matted, non woven web that is held together by pressure (that is commonly referred to a paper) that has been cut into rectangular pieces as well as that which has been wound into rolls.
  • the use of raw cotton linters in this physical form permits cellulose derivative manufacturers to utilize existing manufacturing assets to produce high performance products at cost reduction stems both from the elimination of many purification steps heretofore practiced, as well as other unexpected benefits found for a raw linters-based sheet. It has been found that the resulting derivatives are especially well suited for demanding applications in nonregulated industries such as paint, construction, and oil field.
  • an example of a process for producing the matted sheets of raw cotton linters includes a step wherein bales of raw linters are broken apart and dispersed in a low solids water slurry to form a pulp.
  • the resulting pulp can be formed into a sheet using a variety of papermaking processes. It is preferred that the sheet be made without any chemicals, fillers, or other additives traditionally employed by the papermaking industry.
  • the raw cotton linters fibers not or minimally be subjected to processes such as disk refiners that are designed to fibrillate the fiber's surface. Fibrillated materials occupy a greater volume which decreases the amount of material that can be loaded into a cellulose reactor. Both dry and wet cleaning processes may be employed to remove impurities prior to the formation of the paper sheet. Examples of such impurities include, but are not limited to, inorganic materials as well as cottonseed hull fragments.
  • Basis weight refers to the weight per unit area of a representative sample of the raw cotton linters matted sheet. It is preferred that the sheet be dried to a moisture content of 2 to 20% water. It is most preferred that sheet be dried to a moisture content in the range of 4-12%. The drying should not be done in a manner that causes hornification of the cellulose. Hornification refers to excessive drying of cellulose which renders the material less reactive in subsequent derivatization reactions. It is generally attributed to the formation of strong hydrogen bonds between cellulose anhydroglucose units that are difficult to disrupt.
  • the raw cotton linters sheet undergo shredding and/or cutting prior to chemical derivitization.
  • the raw cotton linters sheet is fed to at least one cutter whereupon it is cut in a manner that the fibers become individually separated from each other prior to being used to make cellulose ethers.
  • the sheet undergo shredding and/or cutting prior to chemical derivatization.
  • the sheet is feed to at least one cutter whereupon it is cut in a manner that the fibers become individually separated from each other and reduced in length.
  • a preferred method makes use of rotary cutters fitted with appropriately-sized mesh screens.
  • cutters examples include CS cutting granulators from Netzsch-Condux
  • raw linters can be processed using conventional papermaking processes.
  • An example of such a process includes a step wherein bales of raw linters are broken apart and dispersed in a low solids water slurry to form a pulp.
  • Typical concentrations of fibers are from 0.01 to 4 %. The optimum concentration depends upon the specific papermaking process and fiber characteristics. For example (J. E. Williamson, Wet-laid Systems in Nonwovens - Theory, Process, Performance, and Testing, p. 142”), conventional papermaking machines generally are produced at 0.3 to 0.7%, whereas wet-laid nonwovens are in the range of 0.01 to 0.05% solids.
  • the resulting pulp can be formed into a sheet using a variety of papermaking processes. It is preferred that the sheet be made without any chemicals, fillers, or additives traditionally employed by the papermaking industry to enhance paper properties for other applications or reduce costs.
  • Both dry and wet cleaning processes may be employed to remove impurities prior to the formation of the paper sheet.
  • impurities include, but are not limited to, inorganic materials as well as cottonseed hull fragments.
  • Mechanical dry cleaning methods may be employed prior to the » ⁇ forl ⁇ tatSbH " ⁇ %fe ⁇ ufp r ⁇ sf ⁇ rry.
  • An example of appropriate dry cleaning equipment is a Continental Eagle IMPCO LC-410D Linters Cleaner.
  • Wet cleaning methods include screen-based processes, both pressurized and nonpressurized, which are particularly useful for removing larger contaminants. Examples of such a process are the Voith Minisorter screen and vibrating flat screens. In addition, centrifugal cleaners (G. A.
  • the concentration of other chemical species present on or in the cotton linters fibers may be significantly reduced by appropriate processing.
  • wax and oil residues are typically found on the surface of raw cotton linters fibers.
  • Washing or extraction with appropriate organic solvents e.g., alcohols, ether
  • appropriate organic solvents e.g., alcohols, ether
  • elevated temperatures preferably 70 C to 95 0 C, and more preferably above 85 C can be employed. This operation may be conveniently performed during the pulping of the cotton linters.
  • Other synergistic additives such as soaps may also be employed to promote the extraction and removal impurities.
  • a variety of processes may be used to form the sheet including, but not limited to, Fourdrinier, cylinder, wet (J. B. Calkin (ed), Modern Pulp and Paper Making, (Reinhold Publishers, New York: 1957), p. 16) machines, belt washers, and disk savealls.
  • Examples of inclined wire Fourdrinier machines include Tampella Sandy Hill Deltaformer ® , Domes Hydraformer ® , and the Neue Bruderhas No-Wo Former ® .
  • a variety of pressing methods may be employed. Examples of appropriate processes include two roll presses, shoe (extended-nip) presses, and platen presses. A series of nips, typically three, in which the pressure progressively increases at each successive nip represents a most preferred embodiment.
  • the sheet be dried to a moisture content of 2 to 20% and most preferably in the range of 4-12%.
  • the drying should be done in a manner that does not cause hornification of the cellulose since this can result in a cellulose that will not be uniformly swollen by alkali.
  • a variety of processes may be used to dry to sheet including heated cylinder "dryer cans", through-air dryer processes, and pulp dryers (e.g., Flakt pulp dryer).
  • Calendering of the dry or partially-dry sheet may be used to improve sheet density, thickness uniformity, and mechanical properties.
  • the optimum dimensional, base weight, density, and mechanical property characteristics of the sheet are determined by the specific cellulose derivative process characteristics.
  • typical cellulose cutters used for industrial manufacturing processes range in width from 0.25 to 2.5 m, most preferably in the range of 0.50 to 1.25 m wide.
  • the sheet fed to such cutters should be approximately the same width, but no wider than, the cutter.
  • the basis weight of the sheet is preferably in the range of 250 to 900 g/m 2 and most preferably in the range of 400 to 700 g/m 2 .
  • Sheet thickness is preferably in the range of 0.04 to 0.30 cm, most preferably in the range of 0.08 to 0.20 cm, and should vary by less than most preferably +5 % within the sheet.
  • This combination of base weight and thickness implies a range of bulk density of the matted sheet.
  • High bulk density is generally desirable, since it results in lower shipping costs and less frequent roll changes.
  • mechanical properties of the sheet the primary concern for materials in roll form is that they be able to be unwound without breaking or tearing. Since materials are unwound at relatively slow, uniform rates into cutters, this does not generally present a problem since the material must have a minimum tensile strength to be consistently wound during paper manufacturing.
  • Second cut raw linters were initially pulped in a Tornado pulper for 30 minutes. The pulp was subsequently transferred to a blend chest whereupon it was diluted to 1.0 % consistency after which it was transferred to a machine chest. Paper was then produced using a 1.1 m Deltaformer paper machine at a headbox consistency of 0.08 % without the use of any additional papermaking chemicals or fillers. The sheet was dried on the machine to a final moisture content of 3.5 %. The resulting raw linters sheet had a basis weight of 700 g/m 2 with a caliper of 2.0 mm.

Landscapes

  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

La présente invention a trait à un procédé pour la fabrication d'une feuille tassée de bourres de coton brut par la dispersion d'une masse en vrac de bourres de coton brut dans l'eau, le retrait d'une portion de l'eau de la masse en vrac, et la compression de la masse en vrac de bourres de coton brut en une feuille tassée. La masse en vrac de bourres de coton brut peut être soumise à un nettoyage préalablement à la dispersion dans l'eau. Le produit fini en feuille peut être découpé dans l'eau. Le produit fini en feuille peut être découpé en pièces rectangulaires ou enroulé sur un rouleau ou séché ou calandré. Cette feuille est utilisée comme matière première pour la fabrication d'éthers cellulosiques.
EP05774719A 2004-07-20 2005-07-19 Procede pour la formation de feuille de bourres de coton brut Withdrawn EP1769120A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58943104P 2004-07-20 2004-07-20
PCT/US2005/025714 WO2006014716A2 (fr) 2004-07-20 2005-07-19 Procede pour la formation de feuille de bourres de coton brut

Publications (1)

Publication Number Publication Date
EP1769120A2 true EP1769120A2 (fr) 2007-04-04

Family

ID=35530832

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05774719A Withdrawn EP1769120A2 (fr) 2004-07-20 2005-07-19 Procede pour la formation de feuille de bourres de coton brut

Country Status (6)

Country Link
US (1) US20060016568A1 (fr)
EP (1) EP1769120A2 (fr)
CN (1) CN1985048A (fr)
AR (1) AR053753A1 (fr)
BR (1) BRPI0513531A (fr)
WO (1) WO2006014716A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101142237B (zh) * 2004-07-14 2011-04-13 赫尔克里士公司 纯化棉短绒的方法
US20070249825A1 (en) * 2006-04-21 2007-10-25 Sau Arjun C Decolorized raw cotton linters and preparation of ether derivatives therefrom
EP2402504A1 (fr) * 2010-06-29 2012-01-04 M-real Oyj Papier transparent comprenant des matières fibreuses composées de plantes annuelles et/ou d'autres matières fibreuses non dérivées du bois à croissance rapide
JP6118617B2 (ja) * 2013-03-29 2017-04-19 大王製紙株式会社 多層紙及び多層紙の製造方法
BR112019023093A2 (pt) * 2017-05-05 2020-05-26 Betulium Oy Derivados de celulose
CN108914660A (zh) * 2018-07-03 2018-11-30 保定钞票纸业有限公司 一种钞票纸用干切棉纤维浆粕及其生产工艺

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2517577A (en) * 1946-12-10 1950-08-08 Hercules Powder Co Ltd Preparation of carboxyalkyl ethers of cellulose
US3235443A (en) * 1963-07-15 1966-02-15 Kimberly Clark Co Process for forming transparentized paper containing cotton linter fibers and paper thereof
DE19632865A1 (de) * 1996-08-14 1998-02-19 Giesecke & Devrient Gmbh Verfahren zur Herstellung von Papiermasse
US6174412B1 (en) * 1998-03-02 2001-01-16 Purely Cotton, Inc. Cotton linter tissue products and method for preparing same
EP1299588B1 (fr) * 2000-05-31 2004-03-10 M & J Fibretech A/S Installation et procede de production a sec d'une bande de fibres en non-tisse, a fibres longues et courtes, et bande en fibres de coton renfermant de la pate de charpie de coton

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006014716A2 *

Also Published As

Publication number Publication date
CN1985048A (zh) 2007-06-20
AR053753A1 (es) 2007-05-23
WO2006014716A2 (fr) 2006-02-09
BRPI0513531A (pt) 2008-05-06
US20060016568A1 (en) 2006-01-26
WO2006014716A3 (fr) 2006-06-29

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