EP1321570A2 - Bande de papier à couches multiples et procédé pour sa formation - Google Patents

Bande de papier à couches multiples et procédé pour sa formation Download PDF

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Publication number
EP1321570A2
EP1321570A2 EP02445182A EP02445182A EP1321570A2 EP 1321570 A2 EP1321570 A2 EP 1321570A2 EP 02445182 A EP02445182 A EP 02445182A EP 02445182 A EP02445182 A EP 02445182A EP 1321570 A2 EP1321570 A2 EP 1321570A2
Authority
EP
European Patent Office
Prior art keywords
paper
drying
multilayer
web
sheets
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Withdrawn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
EP02445182A
Other languages
German (de)
English (en)
Other versions
EP1321570A3 (fr
Inventor
Holger Hollmark
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.)
Essity Hygiene and Health AB
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
Priority claimed from SE0104397A external-priority patent/SE0104397D0/xx
Application filed by SCA Hygiene Products AB filed Critical SCA Hygiene Products AB
Publication of EP1321570A2 publication Critical patent/EP1321570A2/fr
Publication of EP1321570A3 publication Critical patent/EP1321570A3/fr
Withdrawn legal-status Critical Current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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers

Definitions

  • the present invention refers to a method of making a multi-layer paper web. It further refers to a multi-layer paper web having a three-dimensional structure. Especially it refers to the production of tissue products such as toilet and kitchen paper, paper towels, handkerchiefs, wiping material and the like.
  • the lamination of two or more tissue plies is often made by means of gluing.
  • a mechanical embossing of the plies is also often performed before they are glued together. It is further known to laminate two plies only by means of a mechanical embossing, at which a mechanical joining of the plies occurs in the embossing sites.
  • EP-A-796 727 it is known to first emboss two paper plies in a three dimensional structure with alternating raised and recessed portions, after which glue is applied to one of the plies and the two plies are joined in a press nip between two embossing rolls, so that the raised portions of the respective plies are glued to each other.
  • a similar embossing procedure is shown in EP-A-738 588, according to which the glue also has a colouring effect.
  • US 3,414,459 discloses laminating of tissue plies by a combined embossing and gluing procedure.
  • the embossing is of so called foot-to-foot type according to which the raised protuberances of the embossed tissue plies are joined together.
  • US 3,555,907 and US 3,867,225 there are also disclosed a combined embossing and gluing process, but where the embossing is of so called nested type according to which the raised projections of one tissue ply will rest in and be joined to the depressions of the opposite Ply.
  • One way of achieving a single ply tissue product with possibly acceptable properties would be to join two or more individual layers in the wet state in the paper machine before the paper is pressed and dried, while striving to optimize the fibre structure and fibre properties in the individual layers.
  • Two layers can be joined together in the wet state through several operations.
  • multi-ply in this respect means that two or more paper sheets have been combined outside the paper machine in the converting line, such as by embossing and/or gluing, while the term “multi-layer” refers to that two or more sheets of paper have been combined in the paper machine in a wet or moist state, so that papermaking bonds are formed between the layers.
  • TAD through-air-drying
  • WO 99/34055 it is known to impart a three-dimensional pattern in a moist paper web while drying the web by so called impulse drying and impulse embossing.
  • the wet paper web is passed through a press nip comprising a rotatable roll which is heated and the paper web is given said three-dimensional pattern when passing through the press nip, either by means of a patterned wire and/or by the fact that the heated roll is provided with a pattern intended to be pressed into the paper web against a non-rigid holder-on, such as a felt.
  • the three-dimensional pattern is in this case essentially maintained in wet condition of the paper, since it has been imparted to the wet paper web in connection with drying thereof.
  • An object of the present invention is to provide a process of joining two or more sheets of paper in wet or moist condition and obtain a final product which possess properties such as flexibility and absorption capacity which are comparative to those of a multi-ply product.
  • the product could be defined as a single-ply multi-layer product.
  • drying of the multilayer web is made without any considerable compression of the multilayer web.
  • non-compressible drying techniques are through-air-drying (TAD) and infrared (IR) drying.
  • TAD through-air-drying
  • IR infrared
  • drying and imparting said three-dimensional pattern in the separately formed paper sheets is made by impulse drying and impulse embossing, wherein the wet paper sheet is passed through a press nip comprising a rotatable roll which is heated so that the paper sheet when passing through the press nip is given said three-dimensional pattern either by means of a patterned wire and/or by the fact that the heated roll is provided with a pattern intended to be pressed into the paper sheet against a holder-on.
  • the holder-on preferably has a non-rigid surface.
  • drying and imparting said three-dimensional pattern in the separately formed paper sheets is made by through-air-drying (TAD) wherein the wet paper sheet is carried by a patterned wire or belt.
  • TAD through-air-drying
  • an additional component such as an absorbent material and/or spacing means is applied between the paper sheets before combining them.
  • the invention further refers to a multilayer paper web having a three-dimensional structure, said multilayer paper web comprising at least two paper sheets each of which has a three-dimensional pattern of alternating raised and recessed portions, said paper sheets being joined together point- or spotwise by papermaking bonds forming bonding sites, while leaving void volumes between the sheets and between the bonding sites.
  • Fig. 1 shows schematically a machine configuration for making a two-layer paper web, and having a first twin-wire forming unit comprising a first headbox 10 delivering a fibre suspension jet into a nip created by a pair of tensioned forming wires or felts 11 and 12 both of which wrap around a rotating forming roll 13, and a second twin-wire forming unit comprising a second headbox 14 delivering a fibre suspension jet into a nip created by a pair of tensioned forming wires or felts 15 and 16 both of which wrap around a rotating forming roll 17.
  • the forming rolls 13 and 17 may have a solid or open surface. In the case the forming rolls 13 and 17 have open surfaces, they may be supported with a vacuum.
  • the inner part of the twin wire nip is a felt 12; 16 and the outer part is a wire 11; 15.
  • the wet sheets supported by the wires or felts 12 and 16 may be further dewatered over suction boxes (not shown) and are each brought into an impulse drying nip between two rotatable rolls 18, 19 and 20, 21 respectively, at which the rolls 18 and 20 which are in contact with the paper sheets are heated to a temperature which is sufficiently high for providing drying of the paper sheet.
  • the surface temperature of the heated rolls 18 and 20 can vary depending on such factors as the moisture content of the paper sheet, thickness of the paper sheet, the contact time between the paper sheet and the roll and the desired moisture content of the completed paper product.
  • the surface temperature should of course not be so high that the paper sheet 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 sheet is pressed against the heated roll 18; 20 by means of the respective wire or felt 12; 16 and the backing roll 19; 21, which may or may not be provided with a soft non-rigid surface layer, e g rubber or another resilient material.
  • a very rapid steam generation takes place in the interface between the heated roll 18; 20 and the moist paper sheet, at which the generated steam on its way through the paper sheet carries away water.
  • a press shoe or the like may be used as a holder-on in the impulse drying press nip.
  • the backing roll 19; 21 is in the embodiment shown a suction pressure roll with a vacuum 22; 23 such that the paper web is retained on the felt or wire 12; 16.
  • the paper sheet 24 is given a three-dimensional structure by the fact that the heated roll 18; 20 is provided with an embossing pattern in the form of alternating raised and recessed portions 25, 26.
  • This structure is substantially maintained also in a later wetted condition of the paper, since it has been imparted the wet paper sheet in connection with drying thereof.
  • the paper sheet 24 may be pressed against a non-rigid surface, e g a compressible press felt 12; 16.
  • the backing roll 19; 21 may also have a flexible surface, e g an envelope surface of rubber. This is however not necessary in order to accomplish the materials and processes of the present invention.
  • the paper sheet 24 is herewith given a three-dimensional structure having a total thickness greater than that of the impressed paper. By this high bulk, high absorption and high softness of the paper are achieved. The paper further becomes elastic. At the same time there is obtained a locally varying density in the paper.
  • the paper sheet 24 may also be pressed against a hard surface, e g a wire 12; 16 and/or a roll 14 having a rigid surface, at which the pattern of the heated roll 18; 22 is pressed into the paper sheet under heavy compression of the paper just opposite the impressions, while the portions there between are kept uncompressed.
  • a hard surface e g a wire 12; 16 and/or a roll 14 having a rigid surface, at which the pattern of the heated roll 18; 22 is pressed into the paper sheet under heavy compression of the paper just opposite the impressions, while the portions there between are kept uncompressed.
  • the three-dimensional pattern imparted in the paper sheet may also be provided by a pattern wire or belt wrapping the heated cylinder 18; 20, which in this case does not need to be patterned.
  • the three-dimensional patterns imparted to the paper sheets in the two impulse drying and embossing stations may be the same or different.
  • the paper sheets are not dried to the final dryness in the impulse drying and embossing stations, but have a moisture content of at least 20% by weight, preferably at least 30% by weight, when leaving the impulse drying and embossing stations.
  • the two paper sheets 24a and b are joined by letting one sheet be picked up by the other sheet while this is still on its felt 16 wrapping the backing roll 21 with an extended suction zone 23. After that the two joined sheets are picked up from the felt 16 by a wire over a roll 26 having a suction zone 27. Further dewatering may, if necessary, occur by suction box 28.
  • the combined web is then dried by being passed over a drying drum 29 having an air hood 30 mounted there over to direct heated air against and through the web on the drum surface 29.
  • This drying technique is often called through-air-drying (TAD) and is a non-compressive drying producing high bulk and absorbent tissue.
  • non-compressive drying techniques that may be used instead of TAD is for example IR dryers.
  • the dryness of the paper web after the non-compressive drying should be at least 90% or preferably a dryness, which is in equilibrium with the ambient air.
  • the combined paper sheets 24a, b are when dried on the heated cylinders 18;20 joined together point- or spotwise by papermaking bonds forming bonding sites 31, while leaving void volumes 32 between the sheets 24a, b and between the bonding sites 31. This is illustrated in Fig. 4.
  • the void volumes 32 between the sheets contribute in providing the required absorbency and flexibility of the final product.
  • void volumes 32 may according to one embodiment of the invention, illustrated in Fig. 5, contain an additional component 33, such as an absorbent material and/or spacing means.
  • the absorbent material may for example be a so called superabsorbent material, and the multilayer web containing the superabsorbent material may be used as an absorbent layer in an absorbent article such as sanitary napkins, panty liners, diapers and incontinence guards or as highly absorbent wiping material.
  • Spacing means may be a porous moisture insensitive material such as a polymeric foam or synthetic fibrous material, which helps maintaining the bulk of the multilayer web when wet.

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  • Paper (AREA)
EP02445182A 2001-12-20 2002-12-18 Bande de papier à couches multiples et procédé pour sa formation Withdrawn EP1321570A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US34126901P 2001-12-20 2001-12-20
SE0104397 2001-12-20
US341269P 2001-12-20
SE0104397A SE0104397D0 (sv) 2001-12-20 2001-12-20 A multi-layer paper web and a method of forming it

Publications (2)

Publication Number Publication Date
EP1321570A2 true EP1321570A2 (fr) 2003-06-25
EP1321570A3 EP1321570A3 (fr) 2004-01-21

Family

ID=26655636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02445182A Withdrawn EP1321570A3 (fr) 2001-12-20 2002-12-18 Bande de papier à couches multiples et procédé pour sa formation

Country Status (1)

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EP (1) EP1321570A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114753180A (zh) * 2022-05-26 2022-07-15 广东宝拓科技股份有限公司 一种干湿复合造纸机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0796727A2 (fr) * 1996-03-20 1997-09-24 James River Corporation Of Virginia Procédé de fabrication de bandes gaufrées ayant la même définition de gaufrage sur les deux faces
EP0863254A2 (fr) * 1997-02-06 1998-09-09 Voith Sulzer Papiermaschinen GmbH Procédé et machine à papier pour la fabrication d'une bande fibreuse multi-couches
US5919556A (en) * 1996-05-23 1999-07-06 The Procter & Gamble Company Multiple ply tissue paper
WO1999034055A1 (fr) * 1997-12-30 1999-07-08 Sca Hygiene Products Ab Procede de production d'un papier presentant une configuration tridimensionnelle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0796727A2 (fr) * 1996-03-20 1997-09-24 James River Corporation Of Virginia Procédé de fabrication de bandes gaufrées ayant la même définition de gaufrage sur les deux faces
US5919556A (en) * 1996-05-23 1999-07-06 The Procter & Gamble Company Multiple ply tissue paper
EP0863254A2 (fr) * 1997-02-06 1998-09-09 Voith Sulzer Papiermaschinen GmbH Procédé et machine à papier pour la fabrication d'une bande fibreuse multi-couches
WO1999034055A1 (fr) * 1997-12-30 1999-07-08 Sca Hygiene Products Ab Procede de production d'un papier presentant une configuration tridimensionnelle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114753180A (zh) * 2022-05-26 2022-07-15 广东宝拓科技股份有限公司 一种干湿复合造纸机

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Publication number Publication date
EP1321570A3 (fr) 2004-01-21

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