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WO1999036617A1 - Papier a structure tridimensionnelle - Google Patents

Papier a structure tridimensionnelle Download PDF

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Publication number
WO1999036617A1
WO1999036617A1 PCT/SE1998/002455 SE9802455W WO9936617A1 WO 1999036617 A1 WO1999036617 A1 WO 1999036617A1 SE 9802455 W SE9802455 W SE 9802455W WO 9936617 A1 WO9936617 A1 WO 9936617A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
pulp
weight
impulse
drying
Prior art date
Application number
PCT/SE1998/002455
Other languages
English (en)
Inventor
Holger Hollmark
Lennart Reiner
Hans-Jürgen Lamb
Hans Wallenius
Original Assignee
Sca Hygiene Products Ab
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 Sca Hygiene Products Ab filed Critical Sca Hygiene Products Ab
Priority to AU21945/99A priority Critical patent/AU2194599A/en
Priority to DE29824270U priority patent/DE29824270U1/de
Publication of WO1999036617A1 publication Critical patent/WO1999036617A1/fr
Priority to AT0808700U priority patent/AT5097U1/de

Links

Classifications

    • 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
    • D21H11/10—Mixtures of chemical and mechanical pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • 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
    • D21H11/08—Mechanical or thermomechanical pulp
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/02—Patterned paper
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating

Definitions

  • the present invention refers to an impulse dried paper having a three-dimensional pattern of alternating raised and recessed portions which is conveyed to the paper in connection with the impulse drying.
  • Moist paper webs are usually dried against one or more heated rolls.
  • a method which is commonly used for tissue paper is so called Yankee drying.
  • Yankee drying the moist paper web is pressed against a steam-heated Yankee cylinder, which can have a very large diameter. Further heat for drying is supplied by blowing of heated air. If the paper to be produced is soft paper the paper web is usually creped against the Yankee cylinder.
  • the drying against the Yankee cylinder is preceded by a vacuum dewatering and a wet pressing, in which the water is mechanically pressed out of the paper web.
  • TAD through-air-drying
  • the patterned structure of the drying fabric is transferred to the paper web.
  • This structure is essentially maintained also in wet condition of the paper, since it has been imparted to the wet paper web.
  • a description of the TAD technique can be found in e g US-A-3,301,746.
  • Impulse drying of a paper web is disclosed in e g SE-B-423 118 and shortly involves that the moist paper web is passed through the press nip between a press roll and a heated roll, which is heated to such a high temperature that a quick and strong steam generation occurs in the interface between the moist paper web and the heated roll.
  • the heating of the roll is e g accomplished by gas burners or other heating devices, e g by means of electromagnetic induction.
  • EP-A- 0 490 655 there is disclosed the production of a paper web, especially soft paper, where the paper simultaneously with impulse drying is given an embossed surface.
  • This embossment is made by pressing a pattern into the paper from one or both sides against a hard holder-on. This gives a compression of the paper and by this a higher density in certain portions just opposite the impressions and a lower density in the intermediate portions.
  • the object and most important features of the invention is to provide a method of producing an impulse dried paper having a three-dimensional pattern, e g a soft paper intended as toilet paper, kitchen rolls, paper handkerchiefs, table napkins and the like, and where the paper is produced from a pulp especially suitable for impulse drying and the high stresses in the form of high pressures and temperatures that the paper is exerted to.
  • the paper should have a high bulk and a high absorption capacity and the three-dimenisional structure should be maintained in dry as well as in wet condition.
  • the paper contains at least 10% by weight, calculated on the dry fiber weight, of a lignin containing high yield pulp, such as mechanical, thermomechanical (TMP) and chemothermomechanical (CTMP) pulp.
  • TMP mechanical, thermomechanical
  • CMP chemothermomechanical
  • the paper preferably contains at least 30% by weight .and more preferably at least 50% by weight high yield pulp.
  • Fig. 1-3 are a schematic side views of impulse drying devices according to some different embodiments.
  • Fig. 4 a-c show in the form of bar charts dry and wet bulk of impulse dried paper produced from different types of pulp.
  • Fig. 5 shows in the form of bar charts the effect of temperature on bulk and absorption of impulse dried paper made from different types of pulp.
  • Fig. 6 shows in the form of bar charts the effect of temperature on the strength properties of impulse dried paper made from different types of pulp.
  • FIG. 1 shows schematically a device for performing impulse drying of a paper web.
  • the wet paper web 10 which is dewatered over suction boxes (not shown) is supported by a compressible press felt 11 and is brought into a press nip 12 between two rotatable rolls 13 and 14, at which the roll 13 which is in contact with the paper web is heated to a temperature which is sufficiently high for providing drying of the paper web.
  • the surface temperature of the heated roll can vary depending on such factors as the moisture content of the paper web, thickness of the paper web, the contact time between the paper web and the roll and the desired moisture content of the completed paper web.
  • the surface temperature should of course not be so high the paper web is damaged.
  • An appropriate temperature should be in the interval 100-400°C, preferably 150-350°C and most preferably 200-350°C.
  • the paper web is pressed against the heated roll 13 by means of the roll 14.
  • the press device may of course be designed in many other ways. Two and more press devices may also be arranged after each other.
  • the holder-on 14 may also be a press shoe. It is also possible that the paper web 11 is passed into the press nip unsupported, i e not supported by any wire or felt.
  • the paper is after drying wound on a wind-up roll 16. If desired the paper can be creped before winding. It is however noted that the need for creping the paper in order to impart softness and bulk which is aimed at for soft paper, is reduced when using the impulse drying method according to the invention, since the paper by the strong steam expansion in the paper web is imparted bulk and softness and besides a three- dimensional structure.
  • the paper web can before it is brought into the impulse dryer either can be only dewatered over suction boxes or besides slightly pressed according to a conventional process.
  • the paper is given a three-dimensional structure.
  • This can be made as shown in Fig. 1 and 2 by the fact that the heated roll 13 is provided with an embossing pattern consisting of alternating raised and recessed areas.
  • Fig. 1 there is shown an example of such an embossing pattern where the raised portions 17 consist of a protruding relief and the recessed portions of milled grooves.
  • This structure is substantially maintained also in a later wetted condition of the paper, since it has been imparted the wet paper web in connection with drying thereof.
  • embossing is normally used for a shaping performed on dried paper we have in the following used press moulding for the three-dimensional shaping of the paper that occurs simultaneously with the impulse drying. By this press moulding the bulk and absorption capacity of the paper is increased, which are important characteristics for soft paper.
  • the paper can be pressed against a non-rigid surface, i e a compressible press felt 11.
  • the roll 14 can also have an elastically yielding surface, e g am envelope surface of rubber.
  • the paper is herewith given a three-dimensional structure the total thickness of which is greater than the thickness of the unpressed paper. By this the paper is imparted a high bulk and by that a high absorption capacity and a high softness. Besides the paper will be elastic. At the same time a locally varying density is obtained in the paper.
  • the paper can also be pressed against a hard surface, e g a wire 11 and/or a roll 14 having a hard surface, at which the pattern of the heated roll 13 is pressed into the paper web under a heavy compression of the paper opposite the impressions, while the portions therebetween are kept uncompressed.
  • a hard surface e g a wire 11 and/or a roll 14 having a hard surface
  • Fig. 2 differs from what is shown in Fig. 1 by the fact that under the wire 11 there is arranged a felt 17, which extends around the roll 14.
  • the function of the felt 17 is to improve the dewatering effect and extend the press nip.
  • the paper web 10 is during the drying supported by a wire 11 having a pattern, which is press moulded into the paper web when this passes through the press nip 12 between the rolls 13 and 14.
  • the roll 13 can either be smooth, as is shown in Fig. 3, or have an embossing pattern.
  • the press moulded paper will have one smooth surface and one surface with impressions.
  • the roll 13 has an embossing pattern this will also be pressed into the paper, which thus on one side will have a pattern corresponding to the structure of the wire 11 and on the opposite side having a pattern corresponding to the embossing pattern of the roll.
  • the pattern may but need not coincide and/or be the same or different.
  • Paper can be produced by a number of different pulp types. If one disregards recovery pulp, which today is used to a great extent mainly for toilet paper and kitchen rolls, the most commonly used pulp type for soft paper is chemical pulp. This is produced by impregnating wood chips with chemicals and then boil it so that the lignin and the hemicellulose is transferred to the liquid. After finished boiling the pulp is screened and washed before it is bleached. The lignin content in such pulp is practically zero and the fibers, which mainly consist of pure cellulose, are relatively thin and flexible. Chemical pulp can be both of long- and short fiber type depending on the wooden raw material used, and can be of sulphate- or sulphite type depending on the composition of the boiling liquid. Chemical long fiber pulp (softwood), especially of sulphate type, has a favourable effect on the strength properties of the soft paper, both dry- and wet strength.
  • Chemical pulp is a low yield pulp since it gives a yield of only about 50% calculated on the wooden raw material used. It is therefore a relatively expensive pulp. It is therefore common to use cheaper so called high yield pulps, e g mechanical or thermomechanical pulp, in soft paper as well as in other types of paper, e g newsprint paper, cardboard etc.
  • Mechanical pulp is produced by grinding or refining and the principle for mechanical pulp production is that the wood is mechanically disintegrated. The entire wood material is utilized and the lignin is thus left in the fibers, which are relatively short and stiff.
  • the production of thermomechanical pulp (TMP) is accomplished by refining in a disc refiner at an increased steam pressure. Also in this case the lignin is left in the fibers.
  • CMP Chemomechanical pulp
  • CTMP chemothermomechanical pulp
  • a chemomechanical or chemothermomechanical pulp contain more complete fibers and less shives (fiber aggregates and fiber fragments) than a mechanical or thermomechanical pulp.
  • the properties of CMP and CTMP approaches those for the chemical pulps, but there are essential differences depending among other things on that in CMP and CTMP the fibers are coarser and can contain a high amount of lignin, resins and hemicellulose.
  • the lignin and the resins gives the fibers more hydrophobic properties and a reduced ability ro form hydrogen bonds.
  • the addition of a certain amount of chemothermomechanical pulp in soft paper has due to the reduced fiber-fiber bonding a positive effect on properties like bulk .and absorption capacity.
  • HT-CTMP high temperature chemothermomechanical pulp
  • Characterizing for HT-CTMP is that it is a long fibrous-, easily dewatered- and bulky high yield pulp with a low shives content and low fines content.
  • high yield pulp is especially suitable for impulse drying since it is pressure insensitive, easily dewatered and has an open structure which admits the generated steam to pass through. This minimizes the risk for the paper to be overheated and destroyed during the impulse drying, which is performed at considerably higher temperatures than in other drying methods.
  • the pressure insensitivity and the open structure depends on that the fibers in high yield pulp are relatively coarse and stiff as compared to the fibers in chemical pulp.
  • a further advantage is that the three-dimensional structure that has been given the paper is substantially maintained also in wet condition of the paper, since it has been conveyed to the wet paper web simultaneously with the drying thereof.
  • Impulse drying is further performed at a considerably higher temperature than e g Yankee-drying or through-air-drying, and according to a theory, to which however the invention is not bound, the softening temperature of the lignin in the high yield pulp is reached during the simultaneous impulse drying and press moulding.
  • the paper then cools down the lignin becomes stiff again and contributes to permanent the three-dimensional structure that has been conveyed to the paper. This structure is therefore substantially maintained also in the wet condition of the paper, which strongly improves the bulk and absorption characteristics of the paper.
  • the amount of high yield pulp should be at least 10 % by weight calculated on the dry fiber weight, preferably at least 30 % by weight and most preferably at least 50 % by weight.
  • Trials have been made in an experimental equipment in which a paper web having a dry content of about 35 % by weight without previous pressing was exerted to impulse drying at temperatures varying between about 200-300°C and a pressure of about 4 MPA.
  • the impulse drying time was between 3 and 20 msek.
  • the pulp types that were tested were 100% unbeaten chemical sulphate pulp, 100% HT-CTMP and 50/50 unbeaten chemical sulphate pulp/HT-CTMP.
  • Fig. 4 a-c the results of measurements performed with respect to dry and wet bulk of impulse dried paper containing the above pulps are shown. Measurements have been made on unembossed (plane pressed) as well as on embossed (press moulded) paper. Besides measurements have been made on paper with and without addition of KYMENE®, a polyamide-amine-epichlorhydrine resin (PAE).
  • the wet strength agent should be added to the furnish or to the paper web before press moulding, since it has proved that the wet strength agent contributes in permanenting the three-dimensional structure which has been given the paper in connection with the press moulding. The added amount should be at least 0,05 % by weight calculated on the dry fiber weight.
  • impulse dried paper which has been press moulded according to the invention has a high dry and wet bulk. Especially good results were obtained for those papers that contained a high yield pulp in the form of HT-CTMP.
  • Press moulded paper containing HT-CTMP shows also in wet condition a high bulk of 7 c Vg and above. A clear improvement of the wet bulk was achieved when the paper contained a wet strength agent.
  • the lignin containing high yield pulp can as previously mentioned be of many different kinds such as mechanical pulp, thermomechanical, chemomechanical and chemothermomechanical pulp and comprise virgin fibers as well as recovery fibers.
  • the admixture of a certain amount of other pulp with good strength properties, such as chemical pulp, preferably long-fibrous sulphate pulp is an advantage if high strength of the finished paper is aimed at. Also other pulps including recovery pulp can be contained in the paper.
  • the paper web can after the impulse drying be exerted to different types of treatments which per se are known such as addition of different chemicals, further embossing, lamination etc.
  • a treatment may be that the paper web after it has been given the three-dimensional pattern is compressed in a subsequent roll nip which has a temperature which is lower than that of the heated roll, by means of which the paper has been given the three-dimensional pattern. Possibly a further pattern may be pressed into the paper web during this compression.
  • the compression involves a decreased bulk of the paper, which saves space during transport and storing.
  • the deformation of the paper web that takes place during this compression is maintained by means of fiber-to-fiber bonds that are not constant in wet condition.
  • the paper will in contact with water or aqueous liquids recover its three-dimensional structure that was given to it at the impulse drying, at which by the expansion of the paper an increased water absorption capacity is obtained.

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  • Paper (AREA)

Abstract

Papier séché par pressage forcé à température élevée, possédant une structure tridimensionnelle constituée de parties alternantes surélevées et enfoncées qui est conférée au papier lors du pressage forcé à température élevée. Ledit papier contient au moins 10 % en poids, sur la base du poids de la fibre sèche, d'une pâte à haut rendement contenant de la lignine, telle que de la pâte mécanique, thermomécanique et chimicothermomécanique. On part du principe que la température de ramollissement de la lignine dans la pâte à haut rendement est atteinte pendant le séchage par pressage forcé et le gaufrage simultanés. Lorsque le papier est refroidi, la lignine reprend sa rigidité et contribue à fixer la structure tridimensionnelle qui a été conférée au papier.
PCT/SE1998/002455 1997-12-30 1998-12-29 Papier a structure tridimensionnelle WO1999036617A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU21945/99A AU2194599A (en) 1997-12-30 1998-12-29 Paper having a three-dimensional pattern
DE29824270U DE29824270U1 (de) 1997-12-30 1998-12-29 Papier mit einem dreidimensionalen Muster
AT0808700U AT5097U1 (de) 1997-12-30 2000-11-13 Papier mit einem dreidimensionalen muster

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9704909A SE9704909L (sv) 1997-12-30 1997-12-30 Präglat papper innehållande högutbytesmassa
SE9704909-2 1997-12-30

Publications (1)

Publication Number Publication Date
WO1999036617A1 true WO1999036617A1 (fr) 1999-07-22

Family

ID=20409607

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/002455 WO1999036617A1 (fr) 1997-12-30 1998-12-29 Papier a structure tridimensionnelle

Country Status (4)

Country Link
AU (1) AU2194599A (fr)
DE (1) DE29824270U1 (fr)
SE (1) SE9704909L (fr)
WO (1) WO1999036617A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL424518A1 (pl) * 2018-02-06 2019-08-12 Politechnika Łódzka Sposób zmniejszania gęstości papieru w trakcie jego wytwarzania w maszynie papierniczej

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0490655A1 (fr) * 1990-12-12 1992-06-17 James River Corporation Of Virginia Procédé pour séchage d'un tissu fibreux et humide
WO1996009435A1 (fr) * 1994-09-21 1996-03-28 Kimberly-Clark Worldwide, Inc. Bandes presentant une elasticite a l'etat humide
WO1997019198A1 (fr) * 1995-11-24 1997-05-29 Sca Hygiene Paper Ab Papier absorbant doux, ayant du corps et contenant de la pulpe chimiothermomecanique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0490655A1 (fr) * 1990-12-12 1992-06-17 James River Corporation Of Virginia Procédé pour séchage d'un tissu fibreux et humide
WO1996009435A1 (fr) * 1994-09-21 1996-03-28 Kimberly-Clark Worldwide, Inc. Bandes presentant une elasticite a l'etat humide
WO1997019198A1 (fr) * 1995-11-24 1997-05-29 Sca Hygiene Paper Ab Papier absorbant doux, ayant du corps et contenant de la pulpe chimiothermomecanique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL424518A1 (pl) * 2018-02-06 2019-08-12 Politechnika Łódzka Sposób zmniejszania gęstości papieru w trakcie jego wytwarzania w maszynie papierniczej

Also Published As

Publication number Publication date
SE9704909D0 (sv) 1997-12-30
AU2194599A (en) 1999-08-02
DE29824270U1 (de) 2001-02-22
SE9704909L (sv) 1999-07-01

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