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EP1141479B1 - Procede aerodynamique permettant de fabriquer du papier de soie - Google Patents

Procede aerodynamique permettant de fabriquer du papier de soie Download PDF

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Publication number
EP1141479B1
EP1141479B1 EP99973417A EP99973417A EP1141479B1 EP 1141479 B1 EP1141479 B1 EP 1141479B1 EP 99973417 A EP99973417 A EP 99973417A EP 99973417 A EP99973417 A EP 99973417A EP 1141479 B1 EP1141479 B1 EP 1141479B1
Authority
EP
European Patent Office
Prior art keywords
fibers
layer
belt
moistening
pressing
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
EP99973417A
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German (de)
English (en)
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EP1141479A2 (fr
Inventor
Viktor Mikhailovich Drobosyuk
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.)
Pragmatic Vision Inc
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Pragmatic Vision Inc
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Filing date
Publication date
Application filed by Pragmatic Vision Inc filed Critical Pragmatic Vision Inc
Publication of EP1141479A2 publication Critical patent/EP1141479A2/fr
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Publication of EP1141479B1 publication Critical patent/EP1141479B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper

Definitions

  • the present invention relates to the field of papermaking, and more particularly, to an aerodynamic method of and an apparatus for making tissue paper featuring enhanced absorbency.
  • One conventional aerodynamic method of paper making comprises forming of a layer of cellulose fibers out of aerosuspension, impregnating this layer by a liquid reagent, and subsequently pressing and drying of this layer. See, for example, USSR Author's Certificate 1594237, IPC 5 D21H 23/00, 21/18, published August 23, 1990. This method is characterized by the use of 2 - 8 % water solution of resorcin that provides much better swelling of fibers than water. Penetration of water into intercrystalline space of pulp fibers facilitates enhancement of their plasticity, which results in more complete contact of fibers during pressing and drying, and, hence, enhances the strength of fiber bonding.
  • resorcin Since molecules of resorcin form bonds of a "cellulose-resorcin-cellulose" type, resorcin also performs the function of a binder, which also facilitates the enhancement of the produced tissue strength. Thus, when using a water/resorcin solution for moistening the fibrous layer, one can decrease the pressure applied at the stage of pressing, thereby improving tissue absorbency while preserving tissue strength. However, introduction of chemical additives makes tissue paper production more expensive.
  • Another conventional method for making high-absorbency products out of fibrous materials comprising forming of a multi-layer structure of thin paper layers and a layer of fibers produced out of aerosuspension and placed between paper layers. All the layers arranged in the above manner are pressed between rolls, one of which has a patterned surface. See, for example, USA patent 3908659, IPC 2 A61F 13/16, A61L 15/00, published September 30, 1975.
  • Final formation of the product proceeds in the following manner: two structures obtained in the above-described way are folded together facing each other with patterned surfaces and then the edges are jet-molded or glued together. Since the filler in the product comprises substantially non-pressed fibers, the final product offers high hygroscopicity, but the manufacturing cost of such products is very high.
  • One conventional aerodynamic method of papermaking comprises preparation of aerosuspension of cellulose fibers, forming a fibrous layer on a moving forming wire, moistening the moving fibrous layer with water, the amount of which constitutes 20 - 60 % of fiber weight, and subsequently pressing and drying of said fibrous layer.
  • Pressing is performed between two rotating rolls, one of which has a patterned surface made in the form of ridges with flat faces of round (or circular) shape, and the distance between ridges doesn't exceed the average length of the cellulose fibers.
  • the final product obtained after drying has two types of areas: areas of a pressed fibrous layer that determine the strength of the tissue paper, and areas of non-pressed fibrous layer that determine tissue absorbency.
  • the formed fibrous layer should be moistened with a substantial amount of water.
  • this moistening is accompanied by rarefaction of air produced underneath the wire carrying the fibrous layer.
  • Such a moistening process requires amounts of water that are excessive compared to the amounts needed for the formation of inter-fibrous bonds. in addition, it takes an extra time to moisten the entire fibrous layer. All the above results in extra expenditures of energy (mainly expended on subsequent drying of the tissue paper web) and slows down the process of tissue production. Besides, removal of great amounts of water through drying leads to the shrinkage of the non-pressed part of the fibrous layer, which results in a decrease in absorbency of the produced tissue paper.
  • the present invention advantageously decreases the costs related to the manufacture of tissue paper and increases of the quality of the tissue paper.
  • a method of making tissue paper comprises the following steps: preparing an aerosuspension of fibrous material; forming a layer of fibers on a forming wire; transferring the layer of fibers to a profiling belt having a pressing surface containing protruding elements for impressing first areas of the fibrous layer in contact therewith; contacting the layer of fibers disposed on the pressing surface of the profiling belt with a moistening belt; and pressing the layer of fibers between the profiling belt and the moistening belt.
  • the moistening belt has a lower sorption capacity than a sorption capacity of the first areas of the fibrous layer being impressed by the protruding elements and higher than a sorption capacity than second areas of the fibrous layer that are not impressed by the protruding elements.
  • a distance between protruding relief elements on the pressing surface does not exceed an average length of the fibers.
  • the formed layer of fibers can be placed on a profiling belt that has a pressing surface that faces the layer of fibers. Moistening of the formed layer of fibers is performed concurrently with the pressing step, an utilizes an additional belt such as, for example, a moistening belt.
  • the moistening belt is disposed such that a pressing force is exerted concurrently on the profiling belt, the moistening belt, and the layer of fibers located therebetween.
  • the moistening belt is preferably made of a material having a sorption capacity that is lower than a sorption capacity of those areas of the layer of fibers that are pressed due to the protruding relief elements, but higher than the sorption capacity of the areas of the layer of fibers that are not pressed by the relief elements.
  • the moistening belt can be saturated with an appropriate fluid such as, for example, water, in an area that is outside the pressing zone.
  • the fibrous layer placed between the profiling and moistening belts during the step of pressing In the course of pressing, the sections of fibrous layer that are in the areas of protruding relief elements get compacted, which results in an increase of absorbency of the fibrous layer, due to the increase in the pressure of capillary absorption.
  • the fibrous layer absorbency reaches a value equal to the value of the same parameter of the moistening belt
  • the sections of the fibrous layer being compacted begin to absorb water from the moistening belt surface.
  • the excess water is squeezed out from the compacted sections into the non-compacted sections, and due to the difference in capillary absorption pressures, this water returns to the moistening belt. Part of the water returned will subsequently be absorbed by new sections of the layer of fibers being compacted.
  • the moistening belt receives water required for moistening outside the pressing zone, for example, absorbing it when being passed through a tub with water.
  • the present invention provides concurrent moistening and pressing of the fibrous layer in order to minimize the amount of water required at the pressing stage.
  • Selective moistening of fibers only in the sections being compacted eliminates the requirement for moistening the entire fibrous layer, and excessive moistening.
  • drying of the tissue paper web after the pressing step requires significantly lower expenditures of time and energy.
  • shrinkage of the tissue paper web is eliminated because the non-pressed sections of the fibrous layer are not moistened.
  • a wire made by means of interweaving threads can be used as the profiling belt.
  • interweaving nodes represent the protruding relief elements of wire surface, and the shape of flat areas can be endowed through the use of smoothing. This approach can significantly reduces the cost of the process of the present invention.
  • a moistening belt comprises a fine-mesh wire.
  • sorption properties of the moistening belt are determined by surface properties of the material of the wire, as well as by relative sizes and geometrical configurations of threads and openings of the wire.
  • a pressing unit of a paper-making machine that uses the method of the present invention comprises a roller press having two pressure rollers 1 and 2, a profiling belt 3, a moistening belt 4, and a tub 5 with water into which a drum 6 is submerged.
  • the drum 6 is intended for transporting the moistening belt 4 through the tub 5.
  • Fig. 1 also shows a forming wire 7 on which fibrous layer 8 is formed, a drying drum 9, and wire-driving rollers and take-up suction rolls 10 and 11.
  • the profiling belt 3 a fragment of which is shown in Fig. 2, can be made out of wire comprising interweaving threads 12 and wefts 13 of round (circular) cross-section.
  • the nodes of this wire on the side contacting the fibrous layer are smoothed to such an extent that flat pressing surfaces 14 of elliptic shape are produced, and said flat pressing surfaces 14 determine the fibrous layer sections to be pressed.
  • Geometric size of the wire and the surfaces 14 are selected so that a distance between the surfaces 14 of juxtaposed nodes of the wire doesn't exceed an average length of the fibers. The strongest paper retaining good absorbing properties can be produced when this distance is approximately equal to half of the average length of the fibers. In this instance the individual fibers interconnect with each other and transmit mechanical stresses arising in the conditions of paper break from one pressed area to another.
  • Fibrous layer 8 formed out of aerosuspension (forming process is not shown in Fig.1) through the use of the forming wire 7 and the profiling belt 3 is supplied to a zone of the suction roll 10 where the forming wire 7 breaks away, and the side of the fibrous layer 8 that has just lost contact with the forming wire is covered by the moistening belt 4.
  • a forming belt can be made, for instance, in the form of a fine-mesh wire.
  • the fibrous layer 8, now positioned between the profiling belt 3 and the moistening belt 4 is then fed to a pressing operation between rolls 1 and 2. Pressing of the fibrous layer 8 proceeds as described in the Summary of the Invention above. Subsequent to pressing, the belt 4 breaks away in the area of a take-up suction roll 11, and the pressed fibrous layer is fed to the drying drum 9, from which the finished paper web is subsequently obtained.
  • tissue paper with specific weight of 40 - 45 g/m 3 were produced.
  • Softwood and hardwood sulfate bleached pulp (with the average length of fibers 2.7mm and 1.4 mm, respectively) were used as fibrous semi-finished material.
  • An aerosuspension of fibers was prepared out of fibrous semi-finished material that has been moistened in advance to a moisture content of 50%. This aerosuspension was fed to the forming wire where a fibrous layer having a specific weight of 15 - 20 kg/m 3 was formed. A wire of interwoven synthetic threads 0.25mm in diameter and with the distance of 0.25 mm between core threads and 0.3 mm between weft threads was used as forming wire.
  • the formed fibrous layer (the moisture content of which was 30 - 35% at this technological stage) was transported to the profiling belt represented by standard metal wires #1 or #2 of simple interweaving generally used in papermaking industry.
  • Wire #1 is woven out of flat threads, and the shape of its meshes is square.
  • Wire #2 is woven out of threads of round section and of diameter 0.5 mm, and the shape of its meshes square. There are eight threads per 1 cm of running length, and the distance between threads is 0.75 mm. One surface of wire #2 was smoothed up to a depth of 0.25mm. Fiat areas of elliptical shape, the total area of which constitutes 40% of the total wire area, were produced as a result of the smoothing. The fibrous layer was placed on the smoothed wire surface at the pressing stage.
  • Each fine-mesh wire is made by simple interweaving of threads 0.25 mm in diameter, and there are 24 threads per 1 cm of running length.
  • Moisture capacity defined as the amount of water retained by capillary forces in the wire of area 1 m 2 constitutes 0.08 kg/m 2 .
  • the formed fibrous layer placed between the profiling wire (#1 or #2) and moistening wires was fed into the gap between the rolls of a roller press developing a force of 10 or 18 kg on 1cm of layer width. Subsequent to pressing, the moistening wires were taken off the fibrous layer, while the layer being held by profiling wire was fed to drying unit, the surface of which was heated to the temperature of 115 C.
  • Results of the experiments also indicate how parameters of technological process and equipment units exert influence on the final result. For example, when using wire #1 which is made out of flat threads and which has "shallow" relief formed by the interwoven nodes of threads, greater pressure should be applied to obtain required strength properties of the final product.

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  • Paper (AREA)

Claims (12)

  1. La methode aerodynamique pour le production du papier hygiénique en comportant les operations:
    (a) Preparation d'aerosuspension du material fibreux;
    (b) Formation de banc fibreux (8) sur la toile de mouleur (7);
    (c) Transportation de banc fibreux (8) a bande du profillage (3), qui a le surface du pression comportant les elements protuberant (14) pour compresser les premiers sections de banc fibreux 8), qui est en contact avec ces elements;
    (d) Le contact du banc fibreux (8), qui se trouve sur le surface du pression de bande du profillage (3) avec la bande du mouillage (4); et
    (e) Pression du banc fibreux (8) entre la bande du profillage (3) et la bande du mouillage (4);
    caractérisé par le fait que la bande du mouillage (4) a l'absorptivité moins, que l'absorptivite des premiers sections du banc fibreux (8), compressé par les éléments protubérant (14) et plus haut, que l'absorptivité des seconde sections du banc fibreux (8), qui ne sont pas compressé par les élements protuberant (14).
  2. La méthode selon la revendication 1, caractérisé par le fait que la distance entre les elements protuberant voisins (14) de surface du pression de bande du profillage (3) n'est pas plus grand que la longeur moyene du fibre individual de banc fibreux (8),
  3. La methode selon la revendication 1 ou 2, caractérisé par le fait que l'operation de transportation s'est effectué avec l'emploie de bande du profillage (3) qui comporte le toile de mouleur compose des filaments (12,13) attaché de cette manière, que les noeds cree par le susdits filaments attaché (12,13) forment les elements protuberant (14) de surface du pression et les éléments protuberant (14) ont les surfaces relativement plat qui contactent avec les banc(8) fibreux.
  4. La methode selon l'une de revendications 1-3 caractérisé par le fait que l'opération du pression comporte l'action du pression s'effectue simultanément sur les susdits bande du profillage et bande du mouillage.(3,4) et sur le banc (8) fibreux qui se trouve entre les bandes susdits de cette maniere que l'humidification du banc forme est effectuee simultanément avec le pression.
  5. La methode selon l'une de revendications 1 - 4 caractérisé par le fait que la bande du mouillage (4) est humidifie par l'eau en marge de l'espace du pression.
  6. La methode selon l'une de revendications 1 - 5 caractérisé par le fait que l'operation de contacte contient le contacte de banc fibreux (8) depose sur la surface de pression du bande du profillage (30 avec le avec la bande du mouillage (4).
  7. La methode selon l'une de revendications precedents caractérisé par le fait que l'operation de preparation d'aerosuspension contient l'operation de preparation d'aerosuspension de material fibreux, don't le dosage d'humidité procure la saturation des murs fibreux.
  8. L'appareil pour le production pour le production du papier à cigarettes selon la méthode aérodynamique, contenant:
    le toile de mouleur (7) pour la reception l'aerosuspension des fibres et pour le formation du banc fibreux (8) sur cette toile de mouleur;
    la bande de profilage (3) ayant la surface du pression avec les elements protuberant (14) configure et arrange pour le contact avec les premiers surfaces du banc fibreux (8), en cette maniére pressant les premiers surfaces du susdit banc fibreux;
    la bande de mouillage (3), contenant le material a l'absorptivité moins, que l'absorptivite des premiers sections du banc fibreux (8) et plus haut, que l'absorptivité des seconde sections du banc fibreux (8), qui ne sont pas contacté par les elements protuberant (14);
    et
    l'assemblage du pression (1,2) pour presser le banc fibreux (8) entre la bande du profillage (3) et la bande de mouillage (4).
  9. L'appareil selon la revendication 1 ou 2 caractérisé par le fait que le susdit assemblage du pression (1,2) contient deux galets presseurs pour presser le banc fibreux (8), la bande du profilage (3) et la bande de mouillage (4).
  10. L'appareil selon la revendication 8 ou 9 caractérisé par le fait que la distance entre les elements protuberant mutuellment adjacents (14) de surface de pression de bande du profillage (3) n'est pas plus grand, que le longeur moyen des fibres individuals des banc fibreux (8).
  11. L'appareil selon l'une des revendications 8 - 10, caractérisé par le fait que les elements protuberant (14) du susdite surface de pression ont les profiles elliptique.
  12. L'appareil selon l'une des revendications 8 -11, contenant les moyens (5) pour la saturation de bande de mouillage (4) avec l'eau en marge de l'espace de pression.
EP99973417A 1998-12-15 1999-10-25 Procede aerodynamique permettant de fabriquer du papier de soie Expired - Lifetime EP1141479B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU98122569/12A RU2159304C2 (ru) 1998-12-15 1998-12-15 Аэродинамический способ изготовления санитарно-гигиенической бумаги
RU98122569 1998-12-15
PCT/US1999/024732 WO2000036212A2 (fr) 1998-12-15 1999-10-25 Procede aerodynamique permettant de fabriquer du papier de soie

Publications (2)

Publication Number Publication Date
EP1141479A2 EP1141479A2 (fr) 2001-10-10
EP1141479B1 true EP1141479B1 (fr) 2004-02-25

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EP99973417A Expired - Lifetime EP1141479B1 (fr) 1998-12-15 1999-10-25 Procede aerodynamique permettant de fabriquer du papier de soie

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EP (1) EP1141479B1 (fr)
AT (1) ATE260359T1 (fr)
AU (1) AU1220700A (fr)
CA (1) CA2350479A1 (fr)
DE (1) DE69915116T2 (fr)
RU (1) RU2159304C2 (fr)
WO (1) WO2000036212A2 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6726809B2 (en) * 2001-09-26 2004-04-27 Albany International Corp. Industrial process fabric
US7442278B2 (en) 2002-10-07 2008-10-28 Georgia-Pacific Consumer Products Lp Fabric crepe and in fabric drying process for producing absorbent sheet
US7387706B2 (en) * 2004-01-30 2008-06-17 Voith Paper Patent Gmbh Process of material web formation on a structured fabric in a paper machine
US8293072B2 (en) 2009-01-28 2012-10-23 Georgia-Pacific Consumer Products Lp Belt-creped, variable local basis weight absorbent sheet prepared with perforated polymeric belt
US7416637B2 (en) * 2004-07-01 2008-08-26 Georgia-Pacific Consumer Products Lp Low compaction, pneumatic dewatering process for producing absorbent sheet
US8540846B2 (en) 2009-01-28 2013-09-24 Georgia-Pacific Consumer Products Lp Belt-creped, variable local basis weight multi-ply sheet with cellulose microfiber prepared with perforated polymeric belt
US8361278B2 (en) 2008-09-16 2013-01-29 Dixie Consumer Products Llc Food wrap base sheet with regenerated cellulose microfiber
US8298376B2 (en) * 2010-08-19 2012-10-30 The Procter & Gamble Company Patterned framework for a papermaking belt
RU2755301C1 (ru) * 2020-07-14 2021-09-15 Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет промышленных технологий и дизайна" Способ получения бумаги аэродинамического формования

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908659A (en) * 1974-03-14 1975-09-30 Procter & Gamble Absorbent pad structure, diaper construction utilizing same and methods of manufacture thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3949035A (en) * 1968-12-16 1976-04-06 Kimberly-Clark Corporation Method of forming a lightweight airlaid web of wood fibers
CA985084A (en) * 1971-05-20 1976-03-09 Kimberly-Clark Corporation Air formed adhesive bonded webs and method for forming such webs
DK158236C (da) * 1984-02-28 1990-09-10 Scan Web Fremgangsmaade og anlaeg til praegningsbehandling af en toerfremstillet fiberflorbane, f.eks. til koekkenrullepapir
SU1594237A1 (ru) * 1988-02-01 1990-09-23 Ленинградский технологический институт целлюлозно-бумажной промышленности Способ получени бумаги сухого формовани

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3908659A (en) * 1974-03-14 1975-09-30 Procter & Gamble Absorbent pad structure, diaper construction utilizing same and methods of manufacture thereof

Also Published As

Publication number Publication date
WO2000036212A3 (fr) 2000-11-23
EP1141479A2 (fr) 2001-10-10
DE69915116T2 (de) 2004-10-28
WO2000036212A2 (fr) 2000-06-22
RU2159304C2 (ru) 2000-11-20
DE69915116D1 (de) 2004-04-01
ATE260359T1 (de) 2004-03-15
AU1220700A (en) 2000-07-03
CA2350479A1 (fr) 2000-06-22

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