EP0670926B1 - Verfahren zur herstellung von papier - Google Patents

Verfahren zur herstellung von papier Download PDF

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Publication number
EP0670926B1
EP0670926B1 EP94921526A EP94921526A EP0670926B1 EP 0670926 B1 EP0670926 B1 EP 0670926B1 EP 94921526 A EP94921526 A EP 94921526A EP 94921526 A EP94921526 A EP 94921526A EP 0670926 B1 EP0670926 B1 EP 0670926B1
Authority
EP
European Patent Office
Prior art keywords
paper
grinding
tertiary amine
pulp
amine oxide
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.)
Expired - Lifetime
Application number
EP94921526A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0670926A1 (de
Inventor
Stephan Zikeli
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.)
Lenzing AG
Original Assignee
Lenzing AG
Chemiefaser Lenzing AG
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 Lenzing AG, Chemiefaser Lenzing AG filed Critical Lenzing AG
Publication of EP0670926A1 publication Critical patent/EP0670926A1/de
Application granted granted Critical
Publication of EP0670926B1 publication Critical patent/EP0670926B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds

Definitions

  • the present invention relates to a process for the production of paper, in which an aqueous suspension of comminuted cellulosic material is mechanically treated and subjected to a sheet formation process, and the use of a tertiary amine oxide as a grinding aid.
  • pulp to be made into paper must be ground before sheet formation.
  • grinding is to be understood as a mechanical treatment of the pulp in the suspended state, in which its physical properties are changed in such a way that it is suitable for the production of paper.
  • the pulp consisting of cellulose fibers and water is ground, the fibers are cut, fibrillated and swollen. Fibrillation is the splitting of the fibers parallel to the fiber axis. A large part of the fibrils remain fringed on the fibers after grinding. Swelling and fibrillation are of great importance for the production of strong paper.
  • the grinding process is an energy-intensive process. For products that require highly ground fiber, pulp grinding is even one of the most energy-intensive processes in paper production. Polymeric saccharides, monomeric and polymeric amines, amides and dyes are recommended as grinding aids (M. Milichovsky, Chemical aspects of pulp grinding, from: Zellstoff und Textil, 38, p. 17 (1989)). The degree of grinding is given in degrees Schopper-Riegler (SR). The strength of the paper obtained is generally higher, the higher the degree of grinding.
  • SR Schopper-Riegler
  • Machines such as Dutch, cone mills, refiner disc mills, pulper and pulper are used for grinding.
  • the pulp is processed between a moving and a stationary machine part (manual of paper and Pappenfabrikation, (Papierlexikon), 2nd edition, Vol. II, LZ, 1971).
  • the object of the invention is to further develop the conventional paper-making process in order to enable the production of high-strength papers without that conventional auxiliaries are used, the grinding time should be shortened as possible.
  • the process according to the invention for the production of paper is based on a process in which an aqueous suspension of crushed cellulosic material, e.g. Pulp, mechanically treated and then subjected to a sheet formation process and is characterized in that the grinding is carried out in the presence of a tertiary amine oxide.
  • This mechanical treatment is preferably carried out in a refiner.
  • Tertiary amine oxides are known as alternative solvents for cellulose. From US-A 2,179,181 it is known, for example, that tertiary amine oxides can dissolve cellulose without derivatization and that cellulosic shaped bodies such as fibers can be obtained from these solutions by precipitation. US Pat. Nos. 3,447,939, 3,447,956 and 3,508,941 describe further processes for the preparation of cellulosic solutions, cyclic amine oxides preferably being used as solvents. In all of these processes, however, cellulose is physically dissolved at an elevated temperature.
  • waste paper can also be added to the cellulosic material, for example cellulose, by the process according to the invention, and that even then the strength of the resulting paper is high. In this way, waste paper can thus be recycled using the method according to the invention. It is known that waste paper or repeatedly recycled cellulose fibers are not well suited for renewed sheet formation.
  • the above-mentioned embodiment of the method according to the invention is based on the knowledge that shredded waste paper, which is subjected to a grinding treatment again in the presence of a tertiary amine oxide together with other cellulosic material, can be used very well to produce a higher-quality paper.
  • a preferred embodiment of the process according to the invention is that N-methylmorpholine-N-oxide is used as the tertiary amine oxide.
  • the aqueous phase of the suspension best contains the tertiary amine oxide between 55 and 72% by mass.
  • the invention further relates to the use of a tertiary amine oxide as an auxiliary in the mechanical treatment of shredded cellulose-containing material for the production of paper.
  • a tertiary amine oxide as an auxiliary in the mechanical treatment of shredded cellulose-containing material for the production of paper.
  • the use of N-methylmorpholine-N-oxide has proven to be particularly advantageous.
  • pulp from wood pulping using the sulphate and sulphite process was subjected to a standardized grinding treatment according to DIN 54 360 (November 1977) of the standards committee for paper and cardboard in the German Institute for Standardization e.V.) at room temperature.
  • the purpose of such grinding treatment is to create conditions for assessing the strength properties of cellulose. This is only possible if test sheets are formed under specified, reproducible conditions and then tested for their strength properties.
  • suspensions of pre-hydrolysis sulfate pulp (“Buckeye V5 high grade pulp”), a sulfite pulp (“beech wood cooking pulp) and another beech wood cooking pulp, the mechanically pre-ground (sieve size 350 ⁇ m), was ground in a Jokromühle to different SR grades, the consistency of the Suspensions consistently amounted to 12%.
  • These pulps are not classic pulps for papermaking; they were chosen to better show the beneficial influence of the amine oxide. Even better results are consistently achieved with classic paper pulps.
  • Both water and an aqueous solution of NMMO (60% by mass of NNMO, 40% by mass of water) were used as suspension medium for each experiment.
  • the method according to the invention is suitable for all types of pulp and is independent of the selected digestion.
  • waste paper which consisted of fibers which had already been subjected to conventional grinding and sheet formation several times, together with cellulose to give paper of higher quality without the need for additional auxiliaries.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Making Paper Articles (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electronic Switches (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP94921526A 1993-09-06 1994-07-27 Verfahren zur herstellung von papier Expired - Lifetime EP0670926B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT1791/93 1993-09-06
AT0179193A AT401072B (de) 1993-09-06 1993-09-06 Verfahren zur herstellung von papier
PCT/AT1994/000098 WO1995007386A1 (de) 1993-09-06 1994-07-27 Verfahren zur herstellung von papier

Publications (2)

Publication Number Publication Date
EP0670926A1 EP0670926A1 (de) 1995-09-13
EP0670926B1 true EP0670926B1 (de) 1996-03-27

Family

ID=3521055

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94921526A Expired - Lifetime EP0670926B1 (de) 1993-09-06 1994-07-27 Verfahren zur herstellung von papier

Country Status (14)

Country Link
EP (1) EP0670926B1 (da)
AT (2) AT401072B (da)
AU (1) AU683074B2 (da)
BR (1) BR9405577A (da)
CA (1) CA2147276A1 (da)
DE (2) DE4496602D2 (da)
DK (1) DK0670926T3 (da)
ES (1) ES2087000T3 (da)
FI (1) FI952161A (da)
GB (1) GB2286606B (da)
GR (1) GR3019611T3 (da)
NO (1) NO951708L (da)
SI (1) SI0670926T1 (da)
WO (1) WO1995007386A1 (da)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5582681A (en) 1994-06-29 1996-12-10 Kimberly-Clark Corporation Production of soft paper products from old newspaper
US6074527A (en) 1994-06-29 2000-06-13 Kimberly-Clark Worldwide, Inc. Production of soft paper products from coarse cellulosic fibers
US6001218A (en) 1994-06-29 1999-12-14 Kimberly-Clark Worldwide, Inc. Production of soft paper products from old newspaper
US6296736B1 (en) 1997-10-30 2001-10-02 Kimberly-Clark Worldwide, Inc. Process for modifying pulp from recycled newspapers
AT404368B (de) * 1997-02-25 1998-11-25 Chemiefaser Lenzing Ag Verfahren zur herstellung eines verfestigten faserverbundes
US6042890A (en) * 1997-02-25 2000-03-28 Lenzing Aktiengesellschaft Process for producing a strengthened fiber assembly
US6387210B1 (en) 1998-09-30 2002-05-14 Kimberly-Clark Worldwide, Inc. Method of making sanitary paper product from coarse fibers
WO2008119770A1 (de) * 2007-03-30 2008-10-09 Basf Se Verfahren zur modifizierung der struktur eines cellulosematerials durch behandeln mit einer ionischen flüssigkeit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3237574A1 (de) * 1982-10-09 1984-04-12 Hoechst Ag, 6230 Frankfurt Verwendung von aminoxiden bei der zellstoff- und papierherstellung

Also Published As

Publication number Publication date
AU683074B2 (en) 1997-10-30
SI0670926T1 (da) 1997-10-31
DK0670926T3 (da) 1996-07-29
DE4496602D2 (de) 1995-09-21
ATA179193A (de) 1995-10-15
GB9508002D0 (en) 1995-06-07
AU7222094A (en) 1995-03-27
EP0670926A1 (de) 1995-09-13
AT401072B (de) 1996-06-25
GB2286606A (en) 1995-08-23
DE59400174D1 (de) 1996-05-02
ES2087000T3 (es) 1996-07-01
GB2286606B (en) 1997-01-22
NO951708D0 (no) 1995-05-03
WO1995007386A1 (de) 1995-03-16
FI952161A0 (fi) 1995-05-05
BR9405577A (pt) 1999-09-08
GR3019611T3 (en) 1996-07-31
FI952161A (fi) 1995-05-05
ATE136077T1 (de) 1996-04-15
CA2147276A1 (en) 1995-03-16
NO951708L (no) 1995-05-03

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