US20060124262A1 - Board product and method for making the same - Google Patents

Board product and method for making the same Download PDF

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Publication number
US20060124262A1
US20060124262A1 US10/533,038 US53303805A US2006124262A1 US 20060124262 A1 US20060124262 A1 US 20060124262A1 US 53303805 A US53303805 A US 53303805A US 2006124262 A1 US2006124262 A1 US 2006124262A1
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US
United States
Prior art keywords
boxboard
coating
boxboard product
product
coated
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.)
Abandoned
Application number
US10/533,038
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English (en)
Inventor
Matti Lares
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Assigned to METSO PAPER, INC. reassignment METSO PAPER, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LARES, MATTI
Publication of US20060124262A1 publication Critical patent/US20060124262A1/en
Assigned to VALMET TECHNOLOGIES, INC. reassignment VALMET TECHNOLOGIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METSO PAPER, INC.
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • 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
    • D21H23/30—Pretreatment of the 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical 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
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate

Definitions

  • Embodiments of the present invention relate to a coated board product and a method of producing the same.
  • Board is required to have a certain surface quality for ensuring a desired gloss and print quality, and a stiffness and tear resistance for securing the functionality of a package. Since board is produced in large quantities in a board mill, the efficient use of raw material is also important. However, these demands are somewhat contradictory to each other. Board can be provided with a sufficient gloss by calendering the board by compressing it in a nip, often moistened and heated in a certain manner. The surface fibers and coating of board are preferably pressed smooth by this compression, yet without compacting the middle ply of board. The compaction of a middle ply undermines board stiffness and reduces tear resistance. The compaction of a middle ply is often referred to as a loss of bulk. In this case, bulk is understood as being an inverse value to density and a loss thereof is thus equal to a densifying compaction of paper or board.
  • Packing boards are often coated or multi-ply structured.
  • Basic board consists typically of three plies of fiber, wherein the top and back plies are made of bleached pulp.
  • the filler ply consists often of mechanical pulp, typically groundwood (GW), but in many cases also pressure groundwood (PGW) and chemithermo-mechanical pulp (CTMP), or the filler ply can also be made by using broke.
  • the face of board is generally coated twice and the back once. Coating and sizing are used for providing desired properties.
  • a typical basis weight range for boxboards is 180-350 g/m 2 . The necessary basis weight depends on a required stiffness of the container, a lighter board being sufficient for small boxes.
  • Boxboards are often smoothed with a Yankee cylinder prior to coating, which provides a good bulk and stiffness, the surface properties being also good, the drying shrinkage along the edges being likewise small, yet the use of a Yankee cylinder is limited by speed restraint, space demand for equipment and the enormous size of a Yankee cylinder in a high-speed machine.
  • Another typical treatment method involves a wet-stack calender, the drawbacks of which include problems regarding runnability and a controlled application of water and, in addition, extra costs are incurred by the necessity of drying the board before and after a calendering process.
  • a machine calender is often used together with other calenders, the machine calender referring to a hard calender with no elasticity in its rolls. The use of a machine calender as the sole surface treatment method is not advisable.
  • a soft calender refers to a soft-nip calender, wherein the calender roll has a surface which is elastic, the surface having possibly a hardness in the same order as the surface hardness of wood, yet being elastic.
  • the present invention provides a method of making a boxboard product having a smooth printing surface, a high gloss and stiffness in the boxboard with a lesser-than-before consumption of material, and avoiding bottlenecks and improving runnability in the production process.
  • the coated container board of the invention comprises two or more plies of fiber, wherein the outside plies consist of bleached chemical pulp and the inner plies of mechanical pulp or chemithermo-mechanical pulp or broke.
  • boxboard is treated with a long-nip calender prior to coating or during its coating process in order to upgrade the board qualities over what is known before and, in addition, the production runnability is improved and the production method is not subject to a speed restraint the same way as a Yankee cylinder.
  • a long-nip calender suitable for making a board of the invention has been described, for example, in U.S. Pat. No. 6,164,198 also assigned to the assignee of the present invention.
  • a calender suitable for the surface treatment of a board of the invention includes a fixed support element, around which is a tubular jacket.
  • a heated counter-element is disposed on the other side of the tubular jacket from the support element, such that a web passes through between said counter-element and the tubular jacket.
  • the fixed support element is provided with load elements, applying the jacket against the heated counter-element and thereby enabling a calendering process between the jacket and the counter-element.
  • the jacket has its opposite ends secured to end walls mounted rotatably relative to the support element, the rotary motion of the end walls being delivered by a separate drive motor, which is independent of a motion of the fibrous web in order to avoid overheating of the jacket.
  • a method of the invention for conditioning the surface of coated or uncoated board with a surface conditioning device is in turn characterized in that the method comprises feeding a fibrous web through a long nip established by a roll and a counter-roll, the former being in the form of a tubular-shaped flexible jacket. Across the extent of the nip the jacket deflects and thereby presses into contact with the counter-roll over a long stretch.
  • the board treated with the method is lighter than currently available boards, while stiffness and surface properties are equal to those of currently available boards.
  • the solution enables a running speed substantially higher than what is accomplished with a Yankee-cylinder equipped board-machine.
  • the runnability is better, this also contributing to improved quality and reducing waste.
  • Web speed in the calender may be higher than 600 m/min, preferably higher than 800 m/min, and still more preferably 1000 m/min, yet lower than 4000 m/min. Thus, the calender does not restrict the speed of a board machine.
  • the above-mentioned heated roll has a temperature of 150-350° C., preferably higher than 170° C., most preferably about 200-250° C.
  • Linear pressure in the nip is within the range of 100-500 kN/m, preferably less than 400 kN/m, most preferably about 50-300 kN/m. Maximum pressure in the nip is 3-15 MPa, preferably less than 13 MPa, most preferably about 0.5-8 MPa.
  • FIG. 1 is a sectional view of a long-nip calender, provided with a long nip between an enclosed shoe calender and a counter-roll;
  • FIG. 1A is a partial enlargement of FIG. 1 ;
  • FIG. 2A is a partial sectional view of the device shown in FIG. 1 , along the roll axis and depicting a drive mechanism;
  • FIG. 2B shows the operation of press shoes in a longitudinal section.
  • a board web 80 travels through an extended and heated nip 1 .
  • the nip 1 is established by an enclosed shoe roll 10 present under the web 80 .
  • Above the web 80 is a heatable counter-roll 22 .
  • the enclosed shoe roll 10 comprises a flexible jacket 12 impervious to liquid.
  • the jacket consists for example of fiber-reinforced polyurethane.
  • the stationary fixed support element 14 carries at least one load shoe 18 .
  • an actuator 20 such as a hydraulic cylinder, for urging the concave load shoe 18 and thereby also the flexible jacket 12 against the counter-roll 22 .
  • the jacket 12 is forced out of its normal unloaded position 11 in a direction away from the center of the enclosed shoe roll.
  • the jacket 12 is fastened at both ends thereof to end walls 24 , 26 , thus creating a sealed compartment 13 (see FIG. 2 ).
  • at least one detector device 99 is mounted in communication with the web 80 for detecting web breaks.
  • the detector device 99 is connected to a control device 98 for controlling the operation of a calendering process in dependence of the web being broken or not.
  • the heatable counter-roll 22 is accompanied by a disengagement mechanism, comprising a lever 95 pivotable by a hydraulic cylinder assembly 94 and provided with a pivot point 96 for pivoting the lever thereon.
  • the disengagement mechanism presses the counter-roll 22 to an engagement with the nip 1 and disengages it from the nip 1 .
  • a pressurized oil which develops a hydrostatic pressure throughout the nip and presses the jacket to an engagement with the counter-roll 22 over the entire extent of the nip 1 .
  • the oil protects the jacket from being damaged by lumps and a temperature rise.
  • FIG. 2A it is shown that the end walls 24 , 26 are rotatably mounted on stub shafts 16 , 17 of the support element 14 (The end walls are preferably not integral but divided into a static part and a rotating part as shown in FIG. 2B ).
  • a cylindrical shaft 32 On one end of the stub shaft, a cylindrical shaft 32 is arranged rotatably via bearings 34 .
  • a support column 36 is arranged to the cylindrical shaft via self-aligning bearings 38 , which allow spherical movement to allow the deformation/bending of the support element 14 when heavily loaded.
  • One of the end walls 24 is fixedly attached to the cylindrical shaft.
  • a drive transmission 40 is fixedly attached to the cylindrical shaft outside the end wall, in the shown embodiment a cog wheel.
  • the cog wheel is connected to a transmission 42 and in turn a drive 44 .
  • a cog wheel 46 is fixedly attached to the cylindrical shaft inside the end wall.
  • a drive shaft 48 is arranged inside the jacket and parallel to the support element 14 .
  • the drive shaft 48 is supported by bearings 50 arranged in bearing houses 52 attached to the support element.
  • cog wheels 54 are arranged at each end of the drive shaft.
  • Preferably these cog wheels have a prolonged toothed portion to allow axial movement of the intermeshing cog wheel which is attached to the end wall.
  • a further cog wheel 56 is fixedly attached to the second end wall 26 inside the jacket. Both cog wheels inside the jacket mesh with the corresponding cog wheel on the drive shaft.
  • the second end wall 26 is rotatably arranged on the second stub shaft 17 .
  • the second stub shaft is in turn fixedly attached to a second support column 58 .
  • the operation is as follows.
  • the driven heated roll 22 is in interaction with the fibrous web and the flexible jacket 12 by a desired pressure being exerted by the load shoe 18 , thereby causing a friction based drive of both the fibrous web and the flexible jacket. Accordingly, during normal operation the forces exerted in the nip provide for rotation of the enclosed shoe roll.
  • the independent drive arrangement of the enclosed shoe roll is to be used for instance at the start-up of the calendering surface. At the start, the nip gap is not closed, but the roll 22 has been moved out of contact with the nip 1 .
  • the drive arrangement 44 of the enclosed shoe roll 10 is activated to accelerate the first end wall 24 via transmissions.
  • the rotation of the end wall causes the inner first cog wheel 46 to rotate, and subsequently the drive shaft 48 .
  • the drive shaft transmits the rotation to the second end wall 26 via the second inner cog wheel 56 .
  • the both end walls are thus accelerated and rotate at the same speed until a desired peripheral speed is obtained, which is normally equal to the speed of the fibrous web.
  • the nip is closed by activating the hydraulic piston 94 to pivot the lever 95 and thereby moving the counter-roll 22 into the nip and subsequently the load shoe 18 is urged against the heated roll 22 by its actuators 20 .
  • the drive arrangement of the enclosed shoe roll can be deactivated and the press roll driven in a conventional manner by friction within the nip 1 .
  • FIG. 2B there is shown an alternative embodiment of the drive arrangement for an enclosed shoe roll. This embodiment uses friction for the transmission of rotational forces.
  • FIG. 2B also shows a design of arranging the support element and the end walls.
  • the end walls are divided into inner parts 24 A, 26 A connected non-rotatably to the support element 14 , a rotational part 24 B, 26 B, and a bearing assembly 24 C, 26 C therebetween.
  • the support element 14 is at its ends arranged with self-aligning bearings 23 , 25 to allow a deflection of the support element 14 .
  • a drive 44 having a shaft 19 B.
  • a disc 19 having a rubber layer at its peripheral end 19 A.
  • the outer ends of the flexible jacket 12 are fixedly attached between an annular ring 15 , acting as a replaceable force transmitting device, and the periphery of each end wall.
  • the ring 15 is fixedly attached to the end wall.
  • the drive arrangement 44 , 19 is movable in and out of contact with the force transmitting device 15 .
  • FIG. 2B further illustrates in a schematic view one functional embodiment of the load shoe 18 .
  • the load shoe 18 is not disposed diametrically relative to the drive shaft, but perpendicularly as in FIG. 2A .
  • test batches manufactured by a long-nip calender as described above the board could be provided with a ratio of bulk and smoothness better than in currently available types of board.
  • the goals of the invention are achieved.
  • Shoe calenders can be driven at high speeds and, furthermore, by the application of an elevated temperature, e.g. about 250° C., and by taking into account a long dwell time in the calendering zone, the resulting gloss finish will be equal to what is achieved in a slower solution using a Yankee cylinder.
  • the board is provided with improved bulk.
  • the results include savings of production space in a mill, the elimination of a production limiting Yankee cylinder, and the provision of a more manageable, more easily controlled system.
  • surface moistening can be provided prior to calendering.
  • inventive board can also be produced without surface moistening.
  • test results represent a progressive step, regarding for example the quality and production economy of boxboard.
  • pilot tests provide results are somewhat less indicative than those achieved in the ultimate environment, so even on the basis of these preliminary tests, it is possible to draw a conclusion that the method is capable of producing board that is better than before and at the same time more easily and economically producible.
  • the method is applicable to considerably higher speeds than a Yankee cylinder.

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  • Paper (AREA)
US10/533,038 2002-11-27 2003-11-14 Board product and method for making the same Abandoned US20060124262A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20025053A FI116080B (sv) 2002-11-27 2002-11-27 Kartongprodukt och förfarande för dess framställning
FI20025053 2002-11-27
PCT/FI2003/000871 WO2004048689A1 (en) 2002-11-27 2003-11-14 Board product and method for making the same

Publications (1)

Publication Number Publication Date
US20060124262A1 true US20060124262A1 (en) 2006-06-15

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ID=8565222

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/533,038 Abandoned US20060124262A1 (en) 2002-11-27 2003-11-14 Board product and method for making the same

Country Status (6)

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US (1) US20060124262A1 (sv)
JP (1) JP2006508269A (sv)
AU (1) AU2003282138A1 (sv)
DE (1) DE10393788T5 (sv)
FI (1) FI116080B (sv)
WO (1) WO2004048689A1 (sv)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060102303A1 (en) * 2002-11-27 2006-05-18 Matti Lares Board product and method for making the same
US20060118256A1 (en) * 2002-11-27 2006-06-08 Matti Lares Lwc paper product and method of making the same
US8349443B2 (en) 2006-02-23 2013-01-08 Meadwestvaco Corporation Method for treating a substrate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7749583B2 (en) * 2008-05-28 2010-07-06 Meadwestvaco Corporation Low density paperboard

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6022448A (en) * 1995-03-16 2000-02-08 Korsnab Ab Coated paperboard for formed articles
US6164198A (en) * 1998-12-16 2000-12-26 Valmet Corporation Apparatus for calendering paper
US6287424B1 (en) * 1998-09-22 2001-09-11 International Paper Company Method for finishing paperboard to achieve improved smoothness

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI104745B (sv) * 1998-06-25 2000-03-31 Valmet Corp Förfarande och anordning för kalandrering av papper och kartong

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6022448A (en) * 1995-03-16 2000-02-08 Korsnab Ab Coated paperboard for formed articles
US6287424B1 (en) * 1998-09-22 2001-09-11 International Paper Company Method for finishing paperboard to achieve improved smoothness
US6164198A (en) * 1998-12-16 2000-12-26 Valmet Corporation Apparatus for calendering paper

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060102303A1 (en) * 2002-11-27 2006-05-18 Matti Lares Board product and method for making the same
US20060118256A1 (en) * 2002-11-27 2006-06-08 Matti Lares Lwc paper product and method of making the same
US8349443B2 (en) 2006-02-23 2013-01-08 Meadwestvaco Corporation Method for treating a substrate
US8673398B2 (en) 2006-02-23 2014-03-18 Meadwestvaco Corporation Method for treating a substrate

Also Published As

Publication number Publication date
WO2004048689A1 (en) 2004-06-10
FI20025053A (sv) 2004-05-28
JP2006508269A (ja) 2006-03-09
AU2003282138A1 (en) 2004-06-18
DE10393788T5 (de) 2005-10-06
FI116080B (sv) 2005-09-15
FI20025053A0 (sv) 2002-11-27

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AS Assignment

Owner name: METSO PAPER, INC., FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LARES, MATTI;REEL/FRAME:017163/0288

Effective date: 20051011

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

AS Assignment

Owner name: VALMET TECHNOLOGIES, INC., FINLAND

Free format text: CHANGE OF NAME;ASSIGNOR:METSO PAPER, INC.;REEL/FRAME:032551/0426

Effective date: 20131212