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WO1999036618A1 - Papier pare-humidite et son procede de fabrication - Google Patents

Papier pare-humidite et son procede de fabrication Download PDF

Info

Publication number
WO1999036618A1
WO1999036618A1 PCT/US1998/025097 US9825097W WO9936618A1 WO 1999036618 A1 WO1999036618 A1 WO 1999036618A1 US 9825097 W US9825097 W US 9825097W WO 9936618 A1 WO9936618 A1 WO 9936618A1
Authority
WO
WIPO (PCT)
Prior art keywords
moisture barrier
fiber mat
liquid
fibers
pulp product
Prior art date
Application number
PCT/US1998/025097
Other languages
English (en)
Inventor
Rodney D. Hamar
Original Assignee
Liberty Paper, Inc.
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 Liberty Paper, Inc. filed Critical Liberty Paper, Inc.
Priority to AU17022/99A priority Critical patent/AU1702299A/en
Publication of WO1999036618A1 publication Critical patent/WO1999036618A1/fr

Links

Classifications

    • 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
    • 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
    • D21H21/16—Sizing or water-repelling 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28—Addition before the dryer section, e.g. at the wet end or press section

Definitions

  • the present invention relates to a moisture barrier paper and more particularly to a moisture barrier paper that is repulpable, recyclable, and that is created by a wet-end on-machine process.
  • corrugated packaging materials hereafter, "corrugated”
  • Corrugated has numerous applications including packaging or containing various materials that may have a moisture content. In a moisture content situation, it is essential that the corrugated incorporate a moisture barrier to prevent, or at least slow, the leakage of any moisture.
  • the above-listed processes produce a resultant moisture barrier product that is not completely repulpable and, in fact, is often rejected by recycling plants only to end up in a land fill.
  • the resultant moisture barrier product has a surface coating that can affect down-line production.
  • the surface coating is often difficult to print on thereby requiring a special ink.
  • the surface coating may also create problems in gluing portions of the corrugated to form a container; the glue not adhering well to the surface coating.
  • the surface coating is easily scratched reducing the effectiveness of the moisture barrier protection.
  • the surface coating is just that, a surface coating instead of an individual fiber coating, it can become delaminated or separated from its underlying linerboard. This is a special concern in two-ply paper where two dry plies are laminated together by an intermediate moisture barrier coating; with three separate and distinct layers, little force is necessary to delaminate, or pull the plies apart from the moisture barrier coating.
  • U.S. Patent 3,560,334 describes a process in which a flocculant is added to a fiber suspension that is laid out on a moving web. A dispersant containing an additive, such as a water repellant additive, is then applied to the wet web such that the dispersant interacts with the flocculant and clumps together to form particles greater than the pore size of the web resulting in retention of the additive on the surface of the web.
  • an additive such as a water repellant additive
  • a moisture barrier paper of the present invention comprises a fiber mat and a unique moisture barrier coating.
  • the moisture barrier coating coats substantially every fiber throughout the fiber mat.
  • the moisture barrier paper is created in a wet-end, on-machine process where a liquid, moisture barrier coating is sprayed onto a forming fiber mat and is drawn through the fibers with vacuum.
  • the moisture barrier paper has top and bottom surfaces that are substantially free of wax and polymeric water repellants. The moisture barrier paper is completely repulpable.
  • FIG. 1 is a schematic of a typical forming section of a paper machine.
  • the forming section generally incorporates a fourdrinier, which is used in making a single-ply paper or board, and an optional top wire former, which is generally used to enhance the properties of a single-ply or in creating two-ply paper or board.
  • the forming section generally comprises a fourdrinier 10.
  • a headbox 12 positioned at one end of fourdrinier 10 delivers a prepared slurry of paper-making fibers onto the fourdrinier's moving wire or fabric 14.
  • a breast roll 16, generally considered the first element in a fourdrinier, is located under the headbox apron lip 13 and serves to feed wire 14 into the forming area of fourdrinier 10 in a flat and uniform manner.
  • the forming area of fourdrinier 10 comprises of a plurality of foil drainage boxes 18 and vacuum boxes 20. Drainage boxes 18 allow free water to drain away from the paper fibers while vacuum boxes 20 add additional suction to force removal of free water.
  • the number of drainage boxes 18 and vacuum boxes 20 vary with the type of paper or board being made and are selected accordingly by the paper maker.
  • Other drainage devices such as table rolls and vacuum flatboxes, may also be incorporated into the forming section of fourdrinier 10 as appropriate.
  • Suction couch roll 24 draws additional water from the now formed fiber mat prior to the fiber mats transfer to the press section (not shown).
  • a wire turning roll 25 preferably drives the wire 14 while wire return rolls 26 preferably aid in the driving, guiding and tensioning of wire 14.
  • a forming section having only a fourdrinier is often used in the making of a single-ply paper or board.
  • a top wire former 30 is used to enhance the single- ply's quality or to create a two-ply paper or board.
  • headbox 32 delivers a prepared slurry of paper making fibers to a wire or fabric 31.
  • a breast roll 33 serves to feed wire 31, and the slurry atop of it, into the forming section of top wire former 30.
  • the forming section comprises a plurality of drainage boxes 34 and vacuum boxes 36 which are selected appropriately for the type of paper being made.
  • Top wire former 30 also incorporates a suction couch roll 38 that draws additional water from the now formed fiber mat.
  • Top wire former 30 is preferably designed so that suction couch roll 38 may be pivoted or placed in contact with wire 14 of fourdrinier 10 to enable transfer of the top wire former's top ply fiber mat to the fourdrinier's bottom ply fiber mat.
  • FIG.l depicts one configuration of a top wire former, numerous other configurations of top wire formers are available and can be used in conjunction with fourdrinier 10 without departing from the spirit or scope of the invention.
  • liquid sprayer 50 is used in the process of creating a moisture barrier linerboard and is designated as item 50.
  • liquid sprayer 50 is supplied with a liquid, moisture barrier coating material.
  • the liquid, moisture barrier coating material is preferably a material incorporating the characteristics identified in Table 1. TABLE 1
  • the moisture barrier coating contains little, or no, wax or polymeric water- repellants. Further, the moisture barrier coating has no negative effect on, but rather is compatible with, the existing chemistry of the paper making process, e.g. the chemical composition of the slurry. A consequence of this compatibility is that the press felts remain free of any accumulating waxes, polymeric water repellants, or other like materials that eventually plug the press felt drainage holes. Any liquid coating having the above-described, or similar characteristics, may be used without departing from the spirit or scope of the invention.
  • the process of making the moisture barrier paper begins with headbox 12 delivering a prepared slurry of paper-making fibers onto the fourdrinier's moving wire 14. Simultaneously, headbox 32 delivers a prepared slurry of paper-making fibers onto the top wire former's moving wire 31. At the time the slurry hits the wires 14, 31, it consists of approximately 99.5% water and 0.5% fiber. As the slurry progresses across the forming table of fourdrinier 10, drainage boxes 18 and vacuum suction boxes 20 remove free water. Similarly, the paper slurry on the top wire former 30 passes over drainage boxes 34 and vacuum boxes 38 where free water is also removed. Prior to the point at which the base sheet or bottom ply of fourdrinier 10 is joined with the top sheet or ply of top wire former 30, liquid sprayer 50 sprays the liquid, moisture barrier coating across the width of wire 14 onto the base sheet.
  • the base sheet is a fiber mat preferably having a consistency of 8- 24% fiber, and more preferably 15-18% fiber, with the remainder of the consistency comprising liquid or water. Spraying the liquid, moisture barrier coating prior to reaching the above-identified fiber percentages will result in dilution of the coating and weakening of the moisture barrier properties. The addition of the liquid, moisture barrier coating displaces a portion of the existing water and thus, substantially maintains the fiber percentage. After the liquid, moisture barrier coating has been sprayed onto the base sheet and while substantially maintaining the above- identified base sheet fiber percentages, the top sheet from top-wire former 30 is joined to the base sheet.
  • the top sheet is a fiber mat preferably having the consistency of 8-20% fiber, and more preferably 17-20% fiber, with the remainder of the consistency comprising liquid or water.
  • the now existing two-ply sheet, or unitary fiber mat continues to travel over the remaining length of the forming table of fourdrinier 10 for additional water removal.
  • the two-ply sheet preferably consists of 24-30% fiber with the remainder of the consistency comprising liquid or water.
  • Liquid sprayer 50 is preferably placed four to twelve inches above the base sheet and preferably delivers the liquid, moisture barrier coating in an undiluted state and containing 20-75% solids, more preferably 20- 45% solids. Liquid sprayer 50 preferably applies the liquid, moisture barrier coating material at an angle of 90° to the base sheet however, other angles may be equally appropriate.
  • vacuum boxes 20 act to draw the liquid, moisture barrier coating down through the forming fiber mat such that substantially every fiber in the base sheet becomes coated.
  • the top sheet is pressed by couch roll 38 into the bottom sheet and the liquid, moisture barrier coating enabling the top sheet to wick up the liquid, moisture barrier coating into its fibers.
  • the actual amount of coating that is necessary for application varies with the paper grade and weight. A simple measure of whether enough liquid, moisture barrier coating is being applied is when the liquid, moisture barrier coating is noticeable in the liquid draining into the first drainage or vacuum box after the application point.
  • the resulting two-ply linerboard product has a unique moisture barrier that is unitary to the linerboard and its fibers. To achieve the best unitary moisture barrier, it has been determined that 60% of the overall basis weight of the sheet should be maintained in the bottom sheet while the remaining 40% should be maintained in the top sheet. However, a ratio of bottom sheet to top sheet may vary anywhere between 80/20 and 50/50 and still produce a resulting two-ply sheet with desirable moisture barrier properties. Because the moisture barrier coating is not a surface coating and because the unitary moisture barrier contains little, or no, waxes and /or polymeric water repellants, the resultant linerboard is easily printed on with standard inks and is easily glued.
  • WVTR water vapor transmission rate
  • TAPPI Pulp and Paper Industry
  • the WVTR of an uncreased sheet of the moisture barrier linerboard is comparable to that of a two-ply linerboard created by laminating two dry sheets to a surface coating while the WVTR of a creased sheet of the moisture barrier linerboard far surpasses the WVTR of a two-ply linerboard created by laminating two dry sheets to a surface coating.
  • moisture is able to seep under the crack in the surface coating made by the crease and destroy the moisture barrier. No such cracks can occur in the linerboard with the unitary moisture barrier.
  • the linerboard with unitary moisture barrier measures substantially the same WVTR whether tested on its top or bottom surface. Linerboard that is simply surface coated cannot provide the same results.
  • the resultant two-ply, linerboard product with unitary moisture barrier is considerably stronger than that of a two-ply linerboard created by laminating two dry sheets to a surface coating and can be of a considerably less basis weight.
  • a 56 pound basis weight, two- ply linerboard with laminated, intermediate surface coating is appropriately replaced with a 26 pound, basis weight, two-ply linerboard with unitary moisture barrier coating.
  • Such a 26 pound, basis weight linerboard requires approximately 320 pounds of force to pull it apart.
  • the two-ply linerboard with unitary moisture barrier includes the fact that the linerboard can be created completely on- machine, eliminating the need for an on- or off-machine coating station. Further, the liquid, moisture barrier coating requires no alteration in existing machine chemistries. For instance, if the slurry includes a starch or colored dye, the chemical formulation of the starch or colored dye need not be altered to accommodate the liquid, moisture barrier coating. Use of the liquid, moisture barrier coating also produces a linerboard that is completely repulpable as determined by American Forest Products Association/Fiber Box Association's "Voluntary Standard for Repulping and Recycling Corrugated Fiberboard Treated to Improve its Performance in the Presence of Water and Water Vapor". This voluntary standard is hereby incorporated by reference.
  • the repulpability portion of this standard determines the repulpability of treated corrugated by determining fiber-on-fiber yield (the amount of fiber, which remains after a processing action, expressed as a percentage of the fiber present in the material to be tested).
  • the repulpability test method for the voluntary standard may be described in general terms as follows:
  • a 100% charge of treated corrugated is repulped in a British Disintegrator in artificially hardened water at a pH of 7 ( ⁇ 0.5 pH) that is maintained at 135° ( ⁇ 5°) for 45,000 cycles.
  • the pulped material is separated in a screen with 0.010 inch slots to determine fiber recovery as a percentage of the amount of fiber charged.
  • the amount of coating material deposited on a coupon in the disintegrator is used to measure treatment deposition during repulping.
  • the linerboard when the liquid, moisture barrier coating is allowed to cure, e.g. the linerboard is allowed to rest for approximately forty-eight hours prior to additional processing such as fabricating into corrugated, printing, or gluing, moisture barrier properties are increased.
  • the linerboard may be processed immediately, without additional curing, and provide significant moisture barrier protection.
  • a single-ply paper may be created using the process described above but with elimination of the top wire former and its related considerations.
  • the present invention may be embodied in other specific forms without departing from the spirit of the essential attributes thereof; therefore, the illustrated embodiment should be considered in all respects as illustrative and not restrictive, reference being made to the appended claims rather than to the foregoing description to indicate the scope of the invention.

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  • Paper (AREA)

Abstract

L'invention porte sur un papier pare-humidité comportant une natte de fibres et un unique revêtement (50) pare-humidité enrobant sensiblement chacune des fibres de la natte, ledit papier est produit par un processus de couchage sur machine en partie humide (10) par épandage du liquide formant la barrière (50) sur la natte de fibres en formation, puis aspiration du liquide à travers les fibres par des enceintes à vide (20). Les surfaces supérieures et inférieures du papier pare-humidité sont pratiquement exemptes de cire ou de polymères hydrophobes. Ledit papier est entièrement recyclable.
PCT/US1998/025097 1998-01-16 1998-11-24 Papier pare-humidite et son procede de fabrication WO1999036618A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU17022/99A AU1702299A (en) 1998-01-16 1998-11-24 Moisture barrier paper and process for making the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7164798P 1998-01-16 1998-01-16
US60/071,647 1998-01-16

Publications (1)

Publication Number Publication Date
WO1999036618A1 true WO1999036618A1 (fr) 1999-07-22

Family

ID=22102679

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/025097 WO1999036618A1 (fr) 1998-01-16 1998-11-24 Papier pare-humidite et son procede de fabrication

Country Status (2)

Country Link
AU (1) AU1702299A (fr)
WO (1) WO1999036618A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099191A1 (fr) * 2001-06-06 2002-12-12 Kemira Chemicals Oy Procede de fabrication d'un produit de pulpe multicouche comprenant une charge entre les couches
RU2280116C2 (ru) * 2001-06-06 2006-07-20 Кемира Кемикэлз Ой Способ изготовления многослойного целлюлозного продукта, включающего между слоями наполнитель
US20110297342A1 (en) * 2009-02-16 2011-12-08 Jan-Erik Nordstrom Process for the production of paper or paperboard
EP2736713A4 (fr) * 2011-07-27 2014-12-17 Hollingsworth & Vose Co Systèmes et procédés pour réaliser des bandes fibreuses
WO2021067355A1 (fr) * 2019-10-01 2021-04-08 Outlier Solutions Llc Appareil, systèmes et procédés de fabrication de produits en papier isolés retriturables
US11247446B2 (en) 2018-10-01 2022-02-15 Triple Point Innovations Llc Re-pulpable insulated paper products and methods of making and using the same
US11377798B2 (en) 2018-10-01 2022-07-05 Triple Point Innovations Llc Re-pulpable thermally insulated paper products and methods of making and using the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510019A (en) * 1981-05-12 1985-04-09 Papeteries De Jeand'heurs Latex containing papers
US5429294A (en) * 1992-10-27 1995-07-04 Timbarco Corp. Recyclable plastic coated containers
US5603997A (en) * 1991-10-28 1997-02-18 Nobel Ab Packaging material process for producing same and use thereof
US5626945A (en) * 1993-09-28 1997-05-06 International Paper Company Repulpable, water repellant paperboard
US5858173A (en) * 1995-01-06 1999-01-12 Tim-Bar Corporation Paper making process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4510019A (en) * 1981-05-12 1985-04-09 Papeteries De Jeand'heurs Latex containing papers
US5603997A (en) * 1991-10-28 1997-02-18 Nobel Ab Packaging material process for producing same and use thereof
US5429294A (en) * 1992-10-27 1995-07-04 Timbarco Corp. Recyclable plastic coated containers
US5531863A (en) * 1992-10-27 1996-07-02 Timbarco, Corp. C/O Belfint, Lyons & Schuman Method of recycling plastic coated containers
US5626945A (en) * 1993-09-28 1997-05-06 International Paper Company Repulpable, water repellant paperboard
US5635279A (en) * 1993-09-28 1997-06-03 International Paper Company Repulpable, water repellant paperboard
US5858173A (en) * 1995-01-06 1999-01-12 Tim-Bar Corporation Paper making process

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002099191A1 (fr) * 2001-06-06 2002-12-12 Kemira Chemicals Oy Procede de fabrication d'un produit de pulpe multicouche comprenant une charge entre les couches
RU2280116C2 (ru) * 2001-06-06 2006-07-20 Кемира Кемикэлз Ой Способ изготовления многослойного целлюлозного продукта, включающего между слоями наполнитель
US20110297342A1 (en) * 2009-02-16 2011-12-08 Jan-Erik Nordstrom Process for the production of paper or paperboard
US8512517B2 (en) * 2009-02-16 2013-08-20 Stora Enso Ab Process for the production of paper or paperboard
EP2736713A4 (fr) * 2011-07-27 2014-12-17 Hollingsworth & Vose Co Systèmes et procédés pour réaliser des bandes fibreuses
US8956504B2 (en) 2011-07-27 2015-02-17 Hollingsworth & Vose Company Systems and methods for making fiber webs
US11247446B2 (en) 2018-10-01 2022-02-15 Triple Point Innovations Llc Re-pulpable insulated paper products and methods of making and using the same
US11377798B2 (en) 2018-10-01 2022-07-05 Triple Point Innovations Llc Re-pulpable thermally insulated paper products and methods of making and using the same
US11806973B2 (en) 2018-10-01 2023-11-07 Triple Point Innovations Llc Re-pulp able insulated paper products and methods of making and using the same
WO2021067355A1 (fr) * 2019-10-01 2021-04-08 Outlier Solutions Llc Appareil, systèmes et procédés de fabrication de produits en papier isolés retriturables

Also Published As

Publication number Publication date
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