Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
  • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
  • D01F2/08—Composition of the spinning solution or the bath
  • D01F2/10—Addition to the spinning solution or spinning bath of substances which exert their effect equally well in either
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/26—Formation of staple fibres
• • 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
  • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
  • D21H13/02—Synthetic cellulose fibres
  • D21H13/08—Synthetic cellulose fibres from regenerated cellulose
• • 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
  • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
  • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
• • 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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
  • D21H17/24—Polysaccharides
  • D21H17/25—Cellulose
  • D21H17/26—Ethers thereof

Definitions

• the present invention relates to a regenerated cellulose staple fiber obtained by the viscose method.
• the invention relates to a regenerated cellulosic staple fiber in short cut form, which is used in fibrous structures formed by wet processes, e.g. Papers or nonwovens contributes to increase the dry strength.
• CMC carboxymethylcellulose
• the disadvantage of this is the significant leaching of the soluble CMC during the production of the paper or nonwoven.
• the US 20050092451 A1 describes an aqueous solution of CMC as a binder for dispersible sheets.
• JP 2004313486 A describes an aqueous solution of CMC as a binder for wet-laid nonwovens.
• the US 3,318,990 describes a process for the production of viscose flat fibers in which, on the one hand, sodium carbonate and, on the other hand, a water-swelling high molecular substance, eg CMC, are mixed into the viscose.
• a water-swelling high molecular substance eg CMC
• the resulting fibers are described as being completely flat.
• the collapsed cross-sectional structure holds together even when wet.
• the fibers are suitable according to US 3,318,990 for the production of paper.
• the object of the present invention is to provide an adjuvant for producing papers, in particular specialty papers for achieving high dry strengths or a binder fiber for nonwovens, which are produced in a wet process.
• a regenerated cellulose staple fiber selected from the group consisting of standard viscose fibers and solid flat fibers in short cut form (ie, having a cut length of 20 mm or less) incorporating CMC is an excellent excipient for producing papers having improved strength is also excellent in the production of wet nonwovens.
• short cut is commonly used for fibers having a fiber length of 10 mm or less.
• short cut also includes fibers having a length of up to 20 mm.
• the short-cut fiber according to the invention is selected from the group consisting of standard viscose fibers and solid flat fibers whose cross-section has a ratio of width B to thickness D of B: D ⁇ 5, preferably ⁇ 4.5, particularly preferably 3-4.
• Standard viscose fibers have an irregular ribbed cross-section.
• solid flat fibers are meant, for the purposes of the present invention, fibers whose cross-section is a continuous cellulose matrix. This distinguishes these fibers from fibers, which are created by the collapse of a hollow cross-sectional structure (as in the US 3,318,990 described), which is detectable on the cross section and on the typical for massive flat fibers ribbed or rugged surface structure.
• massive flat fibers can be obtained by spinning a viscose through a nozzle having openings in the form of a narrow rectangular slit.
• the cross section of the solid flat fiber according to the invention has a ratio of width B to thickness D of B: D ⁇ 5, preferably ⁇ 4.5, particularly preferably 3-4.
• the cross section can be influenced in particular by the geometry of the spinneret opening.
• the binding of the CMC in the fiber according to the invention is stronger than in the case of fibers in which CMC is only subsequently coated onto the cellulosic fiber.
• the use of the insoluble fiber according to the invention also results in less washout losses.
• Viscose fibers with a proportion of CMC are known. It is a mixed fiber obtained by spinning carboxymethylcellulose into viscose spinning pulp. Such fibers have also been produced commercially ( US 4,199,367 A . US 4,289,824 A ).
• a Viskosepinnmasse is prepared by the usual methods.
• the spinning mass is added immediately before spinning a 8-12 wt.% Solution of carboxymethyl cellulose (CMC), so that the desired storage amount based on underivatized cellulose results.
• Post-processing and drying are carried out by the usual methods.
• the proportion of incorporated carboxymethyl cellulose in the regenerated cellulose fiber is preferably 5% by weight to 50% by weight, more preferably 15% by weight to 40% by weight, most preferably 20% by weight to 30% by weight, based on underivatized cellulose ,
• the carboxymethylcellulose may be a commercial product having a degree of substitution DS of 0.6-1.2, preferably 0.65-0.85 and a viscosity (2% solution, 25 ° C) of 30-800 mPas; preferably 50-100 mPas.
• the fiber titer of the fiber according to the invention is preferably from 0.5 dtex to 8 dtex, more preferably from 1.3 to 6 dtex.
• the cutting length of the fiber according to the invention is preferably 2 to 20 mm, more preferably 4 to 8 mm.
• the cellulose staple fiber according to the invention is outstandingly suitable as a binder fiber for products containing short cut fibers and for nonwovens produced in a wet process, in particular as an auxiliary for the production of paper or paper-like products, eg tea bags, gas and fluid filters, security papers and decorative papers.
• the present invention also relates to a paper or paper-like product, e.g. Teabags, gas and fluid filters, security paper, decorative paper, which contains the cellulosic staple fiber according to the invention.
• a paper or paper-like product e.g. Teabags, gas and fluid filters, security paper, decorative paper, which contains the cellulosic staple fiber according to the invention.
• the paper or paper-like product according to the invention preferably contains from 10 to 99%, particularly preferably from 15 to 45%, of the cellulosic staple fiber according to the invention.
• a standard viscose fiber is made by the usual methods.
• the Viskosepinnmasse is added immediately before spinning the amount of a 10% solution of carboxymethyl cellulose (CMC), so that there is an incorporation of, for example, 20-30% CMC on cellulose.
• Post-processing and drying are carried out by the usual methods; The fiber is cut inline to a length of 20 mm or less, especially 4-8 mm.
• the short-cut fibers can be used as special fibers directly in papermaking.
• a massive flat fiber can be made by incorporating CMC and spinning through a rectangular spinning aperture.
• Atro fibers or fiber mixture
• the nonwoven is then placed on a screen belt at a defined take-off speed.
• nonwovens were produced with a basis weight of about 50 g / m 2 . All webs when wet showed a strength suitable for handling. The nonwovens were then dried without moving in air.
• Fleece A The fleece shows no appreciable strength in the dried state. It is not possible to handle the fleece without it decaying.
• Fleece C The nonwoven shows a significantly higher strength than nonwoven A; it is possible to handle the web in sheet form.
• Fleece B The nonwoven exhibits a substantially higher strength than the nonwovens A and C. The use in suitable applications is possible without the addition of further binders.
• the use of the invention fiber in wet nonwovens thus allows the production of nonwovens with significantly improved dry strength.
• the fiber of the invention acts here as a binder fiber and thus allows a saving of other binders.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Nonwoven Fabrics (AREA)
• Paper (AREA)
• Artificial Filaments (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (2)

Cited By (1)

Families Citing this family (4)

Citations (17)

• 2009
  • 2009-07-31 EP EP09450140A patent/EP2280099A1/fr not_active Withdrawn
• 2010
  • 2010-07-09 WO PCT/EP2010/059868 patent/WO2011012423A1/fr not_active Ceased

Patent Citations (17)

Non-Patent Citations (3)

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