EP3224409B1 - Method and device for producing packaging paper - Google Patents

Method and device for producing packaging paper Download PDF

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Publication number
EP3224409B1
EP3224409B1 EP15797057.5A EP15797057A EP3224409B1 EP 3224409 B1 EP3224409 B1 EP 3224409B1 EP 15797057 A EP15797057 A EP 15797057A EP 3224409 B1 EP3224409 B1 EP 3224409B1
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EP
European Patent Office
Prior art keywords
section
press
dryer
fibrous web
dryer section
Prior art date
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Application number
EP15797057.5A
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German (de)
French (fr)
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EP3224409A1 (en
Inventor
Jacob Zittlow
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Voith Patent GmbH
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Voith Patent GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/12—Crêping
    • B31F1/16—Crêping by elastic belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/18—Shaking apparatus for wire-cloths and associated parts
    • D21F1/20—Shaking apparatus for wire-cloths and associated parts in Fourdrinier machines
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/044—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using air hoods over the cylinders
    • 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
    • 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
    • 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
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • 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
    • 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
    • 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
    • D21H27/10—Packing paper

Definitions

  • the invention relates to a method and a device for producing packaging paper, in particular sack kraft paper.
  • Sack paper also known as sack kraft paper
  • Sacks are made from cellulose fibers and predominantly from long fiber cellulose, as this brings high strength and high porosity to the paper.
  • Sacks are made from sack paper .B. for the packaging of cement and powdered products.
  • the essential properties of sack paper include high strength with sufficient elongation, high porosity and sufficient rigidity. Such properties are only decisive with regard to the load on the bags during transport, but also with regard to the load on the bags when they are filled.
  • a corresponding porosity ensures that when the bags are filled quickly enough air can escape through the sack paper to prevent the bags from bursting and too much dust or the like escaping due to the air flowing out through the filling opening.
  • one side of the paper web which will later form the outside of the sack, be printable, which requires a higher degree of smoothness on the relevant side.
  • DE102010029580 A1 describes a machine for producing a compressed or uncompressed sack paper web.
  • the machine has a headbox, a wire section, a press section, a dryer section, a calender and a reeling unit.
  • the press section consists of only one single press nip, which is designed as a shoe press nip.
  • the document WO1999 / 02772 A1 describes a process for making Kraft paper.
  • the substance becomes a. Subjected to high consistency and low consistency grinding.
  • EP1798331 A1 describes a method for dispersing paper pulps.
  • the method is used to disperse a paper pulp, in which a coarse fraction and a fine fraction are formed with the aid of a fractionation device before the dispersion.
  • the fractionation is carried out in such a way that the coarse fraction contains as much fibers as possible and the fine fraction only contains the fines.
  • the z. B. in a disperser carried out dispersion more effective and economical.
  • the overall process can also be designed to be less laborious overall.
  • the document DE29518848 U1 relates to a press section of a paper machine with a closed web guide, with at least one press nip and a transfer nip, in which the paper web is transferred from a first roller to a second roller, the paper web being guided over the first roller on a belt with little water-absorbing surface, and the paper web being in contact with the second roller.
  • the document GB934757 A relates to a method and apparatus for drying a paper web.
  • the construction of an impingement drying hood and its application in a drying section of a paper machine is described as the drying device.
  • Sack kraft paper is a niche product in the packaging paper sector. Unbleached grades are produced with existing machines based on several different machine concepts. Here, stretchable sack kraft paper grades are already being used using a so-called "Extensible Unit", for example known as a Clupak unit, manufactured as a compression device with an elastic band through which the still moist fibrous web is creped in order to improve its elongation properties in the direction of web travel.
  • Extensible Unit for example known as a Clupak unit, manufactured as a compression device with an elastic band through which the still moist fibrous web is creped in order to improve its elongation properties in the direction of web travel.
  • the invention is based on the object of specifying a method and a device for producing packaging paper, in particular sack kraft paper, with which the investment and operating costs are minimized overall while maintaining a high quality of the packaging paper produced.
  • this object is achieved by a method for the production of packaging paper, in particular sack kraft paper, in which a pulp suspension is thickened in a stock preparation system to a solids concentration in the range of about 30% to about 35% before high-consistency grinding and the high-consistency grinding at a solids concentration in the range of about 30% to about 35% is carried out, the fibrous web is subjected to a low consistency milling after high-consistency grinding at a solids concentration in the range of about 1% to about 3%, the fibrous suspension by means of a headbox with a consistency of ⁇ 0.5%, in particular with a Stock consistency in the range from about 0.15% to about 0.25%, for dewatering and formation of a fibrous web is applied to the Fourdrinier wire of a Fourdrinier wire former or a hybrid former, the Fourdrinier wire is excited to shaking movements, especially in the initial sheet forming area, and the formed fibrous web is further dewatered in a press section and dried in a dryer section.
  • the dryer section comprises a pre-dryer section and an after-dryer section
  • the pre-dryer section preferably contains several dryer groups and the pre-dryer section comprises a maximum of two single-tier dryer groups and the pre-dryer section comprises a maximum of three double-tier dryer groups with in particular a maximum of eight drying cylinders each.
  • An impingement drying unit is assigned to the drying cylinder of the after-dryer section and a compression device designed with an elastic belt is arranged between the pre-dryer section and the after-dryer section in order to compress the fibrous web in the direction of travel of the web.
  • the fibrous web is preferably thickened by means of a screw press or a twin-wire press.
  • a hybrid former has a fourdrinier wire on which the fibrous web is only dewatered to one side in the initial area. After the initial area, the fibrous web is dewatered on both sides between a second dewatering wire and the fourdrinier wire.
  • Hybrid formers are at higher speeds the paper machine advantageous. This increases the dewatering performance without impairing the quality of the fibrous web produced.
  • the high-consistency grinding at a solids concentration in the specified range increases the strength of the later-formed packaging paper web. Since the fourdrinier wire of the Fourdrinier former or hybrid former is excited to shake, the sheet formation is positively influenced, which results in greater strength in the packaging paper web.
  • the Fourdrinier wire of the Fourdrinier former or hybrid former is an endless circulating Fourdrinier belt. In this case, drainage elements can be provided in particular within the loop of this Fourdrinier wire.
  • the wire section can be designed with a suction roll or without such a suction roll.
  • the fourdrinier wire of the fourdrinier wire former or hybrid former can be guided around a roller, in particular at the end of the sheet forming area, which is provided as a suction screen roller or as a closed roller, as the case may be.
  • the fourdrinier wire is preferably guided around a breast roller in the initial sheet forming area and the breast roller is acted upon by means of a shaking device in order to shake the fourdrinier wire.
  • the breast roll can be moved back and forth in particular in the axial direction, whereby the fourdrinier wire is displaced transversely to the direction of web travel.
  • the fibrous web emerging from the press section preferably has a dry content in the range from 35% to 45% and preferably a dry content in the range from 40%.
  • the fibrous web in the press section is passed through only a single press nip, which is formed by a double-felted press nip which is lengthened in the direction of travel, in particular as a shoe press nip.
  • the press unit in question can therefore be a so-called SingleNipcoFlex press.
  • a relevant shoe press nip can in particular be formed between a shoe press roll and a counter roll, the shoe press roll having a flexible roll shell which is guided over a press shoe.
  • the fibrous web is passed through the extended press nip lying between the two felts.
  • the felts are endless, circulating felt belts.
  • the fibrous web in the press section is passed through only two press nips arranged one behind the other, each formed by a press nip which is extended in the direction of travel, in particular as a shoe press nip, the second press nip in the direction of travel in particular is simply felted and provided with a transfer ribbon.
  • the first press nip can in particular be double felted.
  • the felts and the transfer belt are endless circulating felt belts or an endless circulating transfer belt.
  • the transfer belt can be designed to be at least essentially impermeable and smooth. By guiding the fibrous web with such a transfer belt through the second press nip, the fibrous web is given a smoother side, with which the finished packaging paper or sackcloth paper can be better printed.
  • the fibrous web in the press section is only passed through a so-called DuoCentriNipcoFlex press with three successive press nips.
  • the DuoCentriNipcoFlex press is a compact three-nip press in which the underside of the fibrous web only comes into contact with a felt in the first press nip viewed in the direction of web travel, while in the two subsequent press nips only the upper side of the fibrous web comes into contact with one Felt comes into contact and the underside of the fibrous web comes into contact with a smooth roller.
  • a press section designed in this way like a press section with only two press nips arranged one behind the other and a transfer belt guided through the second press nip, is particularly suitable for the production of especially bleached sack kraft paper types to be printed.
  • the device according to the invention for the production of packaging paper, in particular sack kraft paper accordingly comprises a stock preparation system which has a thickening device in order to thicken a pulp suspension to a solids concentration in the range of about 30% to about 35%, and contains refiners in order to thicken the pulp suspension after a High consistency grinding at a solids concentration in the range of about 30% to about 35% and, after high-consistency grinding, to subjecting a low-consistency grinding at a solids concentration in the range of about 1% to about 3%, a wire section for dewatering the fiber suspension and for the formation of a fiber web, which has a Fourdrinier wire former or hybrid former, on whose fourdrinier the pulp suspension can be applied through a headbox with a consistency of ⁇ 0.5%, in particular with a consistency in the range from about 0.15% to about 0.25%, a shaking device through which the fourdrinier can be excited to shaking movements in particular in the initial sheet forming area, a press section for further dewatering of the fibr
  • the dryer section comprises a pre-dryer section and an after-dryer section
  • the pre-dryer section preferably contains several dryer groups and the pre-dryer section comprises a maximum of two single-tier dryer groups and the pre-dryer section comprises a maximum of three double-tier dryer groups with in particular a maximum of eight drying cylinders each.
  • An impingement drying unit is assigned to at least one drying cylinder of the after-dryer section and a compression device designed with an elastic band is arranged between the pre-dryer section and the after-dryer section in order to compress the fibrous web in the direction of travel of the web.
  • the thickening device preferably comprises a screw press or a twin-wire press.
  • the wire section can be designed with a suction roll or without such a suction roll.
  • the fourdrinier wire of the fourdrinier wire former or hybrid former can be guided around a roller, in particular at the end of the sheet forming area, which is provided as a suction screen roller or as a closed roller, as the case may be.
  • a shaking device is preferably provided for shaking the fourdrinier wire, through which a breast roller can be acted upon, around which the fourdrinier wire is guided in the initial sheet forming area.
  • the device is preferably designed in such a way that the fibrous web emerging from the press section has a dry content in the range from 35% to 45% and preferably a dry content in the range of 40%.
  • the press section has only a single press nip, which is formed by a double-felted press nip which is lengthened in the direction of travel of the web, in particular provided as a shoe press nip.
  • the extended press nip is preferably designed to generate press pulses> 55 kPa ⁇ s.
  • the press section has only two press nips arranged one behind the other, which are each formed by a press nip which is lengthened in the direction of web travel, in particular provided as a shoe press nip, the second press nip, viewed in the direction of travel, in particular being single felted and provided with a transfer band.
  • the first press nip viewed in the direction of travel of the web is preferably double felted.
  • the press section has only one DuoCentriNipcoFlex press with three successive press nips.
  • the headbox is preferably equipped with a dilution water control.
  • the basis weight cross profile of the fibrous web can be regulated by adding more water to the corresponding zone at places that are too heavy in or in front of the headbox and thus reducing the consistency of the fibrous suspension in this zone. If the spots are too light, the Regulation in reverse. With a correspondingly improved basis weight transverse profile of the fibrous web, a more uniform porosity, strength and elasticity of the sackcloth paper are achieved across the width of the paper web.
  • a respective press nip extended in the direction of web travel has a length> 220 mm, in particular> 270 mm.
  • a correspondingly long press nip results in a higher dry content of the fibrous web.
  • the dryer section comprises a pre-dryer section and an after-dryer section.
  • the pre-dryer section preferably contains several, in particular short, dryer groups.
  • the pre-dryer section comprises a maximum of two single-tier dryer groups.
  • the pre-dryer section comprises a maximum of three two-tier dryer groups with in particular a maximum of eight drying cylinders each.
  • the pre-dryer section comprises at least one nozzle moistener for moisture transverse profiling.
  • a nozzle humidifier is particularly preferred when the press section is provided with only one press nip or shoe press nip which is elongated in the direction of travel of the web.
  • the dryer section comprises an upsetting device, designed in particular as a so-called "extensible unit" with an elastic belt, in order to compress the fibrous web in the direction of travel of the web.
  • the fibrous web in front of the upsetting device preferably has a dry content in the range from approximately 62% to approximately 68%.
  • the fibrous web is compressed in the direction of travel of the web by pulling together the relieved elastic band of the compression device ("Extensible Unit"), which results in a crepe effect. This usually results in a negative pull over the upsetting device.
  • the fibrous web can preferably be subjected to a negative tension by means of the upsetting device, which is defined by a speed difference in a range from approximately -1% to approximately -5%.
  • a negative tension of around -3% is advantageous for "SemiExtensible” grades, i.e. grades with medium elasticity.
  • "Extensible” types i.e. with types with higher elasticity, a negative tension of up to -5% is conceivable.
  • the flexible band of the compression device (“Extensible Unit”) is expediently positioned on the non-smooth upper side of the fibrous web in order not to destroy its smooth side.
  • the underside of the fibrous web is smooth.
  • both sides of the fibrous web are essentially equally smooth.
  • the flexible band of a compression device (“Extensible Unit”) can optionally be positioned on the upper side of the fibrous web in order to ensure good runability or machinability and to keep the execution as simple as possible.
  • Impingement drying unit is assigned to at least one drying cylinder of the after-dryer section. Impingement drying is based on heat transfer by convection as a result of the impact ("impingement") of air jets on the fibrous web.
  • a respective impingement drying unit is positioned directly above the non-felted fibrous web so that the fibrous web can shrink freely through a felt.
  • a corresponding impingement or impingement flow drying can take place, in particular via the drying cylinders located at the top.
  • impingement drying units can be positioned both on top and bottom drying cylinders.
  • a winder is expediently arranged downstream of the dryer section or after-dryer section, the fibrous web being able to be rolled up by this winder preferably at a dry content in the range from about 92% to about 94%.
  • FIG. 1 and 2 show a schematic representation of an exemplary embodiment of a device 10 according to the invention for the production of packaging paper, in particular sack kraft paper.
  • the device comprises a stock preparation unit 12, a wire section 14 for dewatering a fiber suspension and for forming a fiber web, a press section 16 for further dewatering the fiber web and a drying section 18 for drying the fiber web.
  • the stock preparation 12 comprises a thickening device 20 to thicken the pulp suspension to a solids concentration in the range of about 30% to about 35%, as well as refiners 22, 24 to thicken the pulp suspension after thickening a high consistency grinding and after the high consistency grinding a low consistency grinding at a solids concentration in Subject to range from about 1% to about 3%.
  • the refiner 22 is therefore used for high-consistency grinding, while the refiner 24 arranged downstream of it is used for low-consistency grinding.
  • the wire section 14 comprises a fourdrinier wire former, on the fourdrinier wire 26 of which the fiber suspension can be applied through a headbox 28 with a stock consistency ⁇ 0.5%, in particular with a stock consistency in the range from about 0.15% to about 0.25%.
  • the fourdrinier wire could also be the fourdrinier wire of a hybrid former.
  • the wire section 14 is assigned a shaking device (not shown) by means of which the fourdrinier wire can be excited to shake movements, particularly in the initial sheet forming area.
  • the thickening device 20 can in particular comprise a screw press.
  • the thickening can, however, also take place using a twin-wire press.
  • the endless revolving Fourdrinier wire 26 is guided around a breast roller 30 in the initial sheet forming area.
  • This breast roller 30 can be acted upon by the shaking device.
  • the device 20 can in particular be designed or operated in such a way that the fibrous web emerging from the press section 18 has a dry content in the range of 35% to 45% and preferably a dry content in the range of 40%.
  • the press section 16 has only a single press nip 32 (see Fig. 2 ), which is formed by a double-felted press nip which is lengthened in the direction of web travel L, in particular as a shoe press nip.
  • This press nip 32 is formed between two press rolls 34, 36, one of which is designed as a shoe press roll with a flexible roll shell guided over a press shoe.
  • the fibrous web is guided through the elongated press nip 32 lying between an upper felt 38 and a lower felt 40.
  • the press unit in question is therefore a so-called SingleNipcoFlex press.
  • the press unit can be designed in particular to generate press pulses> 55 kPa ⁇ s in the press nip 32.
  • the fibrous web and the lower felt 40 are separated from the upper felt 38 after the double-felted extended press nip 32 in the present case, for example by means of a separating suction device 42, so that the fibrous web is continued through the lower felt 40.
  • a press section with only two press nips arranged one behind the other is also conceivable, each of which is formed by a press nip which is lengthened in the direction of web travel, in particular as a shoe press nip, wherein the second press nip viewed in the direction of travel of the web can in particular be simply felted and provided with a transfer band.
  • the press section 16 can also have only one DuoCentriNipcoFlex press with three successive press nips.
  • the headbox 28 can be provided with a dilution water control.
  • the wire section 14 can be designed with a suction roll or without such a suction roll.
  • the fourdrinier wire 26 is guided around a roller 44 at the end of the sheet forming area, which, depending on the case, can be designed as a suction screen roller or as a closed roller.
  • a high vacuum suction roll can optionally be provided as the suction roll.
  • the extended press nip 32 of the shoe press unit comprising the two press rollers 34, 36 can in particular have a length> 220 mm, preferably greater than 270 mm.
  • the dryer section 18 comprises a pre-dryer section 18 1 and an after-dryer section 18 2 .
  • the pre-dryer section 18 1 preferably contains several, in particular short, drying peaks.
  • the pre-dryer section 18 1 preferably comprises one or two single-tier dryer groups and / or one to three two-tier dryer groups, in particular each with a maximum of eight drying cylinders 46.
  • the pre-dryer section 18 1 can in particular also comprise at least one nozzle humidifier 48 for moisture transverse profiling.
  • a nozzle humidifier is particularly advantageous when the press section 16 is provided with a SingleNipcoFlex press.
  • the dryer section 18 also comprises an upsetting device 50, which is arranged, for example, between the pre-dryer section 18 1 and the after-dryer section 18 2 , in particular designed as a so-called "extensible unit" with an elastic band 52, in order to compress the fibrous web in the direction L of travel.
  • the flexible band 52 of this upsetting device 50 is positioned on the upper side of the fibrous web. This is particularly advantageous when the press section 16 is provided with a TandemNipcoFlex press with two extended press nips or a DuoCentriNipcoFlex press in order to ensure that the smooth underside of the fibrous web is not destroyed.
  • the fibrous web in front of the upsetting device 50 preferably has a dry content in the range from approximately 62% to approximately 68%.
  • a negative tension is expediently applied to the fibrous web, which is defined by a speed difference in a range from approximately -1% to approximately -5%.
  • At least one drying cylinder 46 of the after-dryer section 18 2 is assigned an impingement drying unit 54, wherein in the present case one such impingement drying unit 54 is assigned to a plurality of drying cylinders.
  • the dryer section 18 or the after-dryer section 18 2 is followed by a reel 56.
  • the fibrous web can be rolled up by this winder 56, in particular with a dry content in the range from approximately 92% to approximately 94%.

Description

Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zur Herstellung von Verpackungspapier, insbesondere Sackkraftpapier.The invention relates to a method and a device for producing packaging paper, in particular sack kraft paper.

Sackpapier, auch Sackkraftpapier genannt, wird aus Zellstofffasern und überwiegend aus Langfaserzellstoff hergestellt, da dieser eine hohe Festigkeit und eine hohe Porosität des Papiers mit sich bringt. Aus Sackpapier werden Säcke .B. für die Verpackung von Zement und von pulverförmigen Produkten gefertigt. Zu den wesentlichen Eigenschaften des Sackpapiers gehören eine hohe Festigkeit bei ausreichender Dehnung, eine hohe Porosität sowie eine ausreichende Steifigkeit. Solche Eigenschaften sind nur hinsichtlich der Belastung der Säcke beim Transport entscheidend, sondern auch im Hinblick auf die Belastung der Säcke beim Befüllen erforderlich. Durch eine entsprechende Porosität wird sichergestellt, dass bei einem raschen Befüllen der Säcke genügend Luft durch das Sackpapier hindurch entweichen kann, um zu verhindern, dass die Säcke platzen und durch das Abströmen von Luft durch die Befüllöffnung zu viel Staub oder dergleichen entweicht. Zunehmend wird auch gefordert, dass eine Seite der Papierbahn, die die spätere Außenseite des Sackes bildet, bedruckbar ist, was eine höhere Glätte der betreffenden Seite voraussetzt.Sack paper, also known as sack kraft paper, is made from cellulose fibers and predominantly from long fiber cellulose, as this brings high strength and high porosity to the paper. Sacks are made from sack paper .B. for the packaging of cement and powdered products. The essential properties of sack paper include high strength with sufficient elongation, high porosity and sufficient rigidity. Such properties are only decisive with regard to the load on the bags during transport, but also with regard to the load on the bags when they are filled. A corresponding porosity ensures that when the bags are filled quickly enough air can escape through the sack paper to prevent the bags from bursting and too much dust or the like escaping due to the air flowing out through the filling opening. There is also increasing demand that one side of the paper web, which will later form the outside of the sack, be printable, which requires a higher degree of smoothness on the relevant side.

Im Dokument DE102010029580 A1 ist eine Maschine zur Herstellung einer gestauchten oder ungestauchten Sackpapierbahn beschrieben. Die Maschine weist einen Stoffauflauf, eine Siebpartie, eine Pressenpartie, eine Trockenpartie, ein Glättwerk und eine Aufrolleinheit auf. Die Pressenpartie besteht aus nur einem einzigen Pressnip, der als Schuhpressnip ausgeführt ist.In the document DE102010029580 A1 describes a machine for producing a compressed or uncompressed sack paper web. The machine has a headbox, a wire section, a press section, a dryer section, a calender and a reeling unit. The press section consists of only one single press nip, which is designed as a shoe press nip.

Das Dokument WO1999/02772 A1 beschreibt ein Verfahren zur Herstellung von Kraftpapier. Dabei wird in der Stoffaufbereitung der Stoff einer. Hochkonsistenz- und einer Niederkonsistenzmahlung unterzogen.The document WO1999 / 02772 A1 describes a process for making Kraft paper. In the stock preparation, the substance becomes a. Subjected to high consistency and low consistency grinding.

Im Magazin Pulp &Paper International, 1. Oktober 2004 , wurde der Artikel "Stretching the Limits" veröffentlicht. Es werden verschiedene Parameter zur Herstellung eines Sackkraftpapieres beschrieben. Unter anderem wird der Einsatz einer "Clupac-Einheit" zur mikro-Kreppung von Sackkraftpapier dargelegt.in the Pulp & Paper International magazine, October 1, 2004 , the article "Stretching the Limits" was published. Various parameters for the production of sack kraft paper are described. Among other things, the use of a "Clupac unit" for micro-creping sack kraft paper is presented.

In der Offenlegungsschrift EP1798331 A1 ist ein Verfahren zur Dispergierung von Papierfaserstoffen beschrieben. Das Verfahren dient zur Dispergierung eines Papierfaserstoffes, bei dem vor der Dispergierung mit Hilfe einer Fraktioniervorrichtung eine Grobfraktion und eine Feinfraktion gebildet wird. Dabei wird die Fraktionierung so durchgefuehrt, dass in der Grobfraktion moeglichst alle Fasern und in der Feinfraktion möglichst nur die Feinstoffe enthalten sind. Durch das Verfahren wird die z. B. in einem Disperger durchgefuehrte Dispergierung effektiver und oekonomischer. Auch das Gesamtverfahren kann insgesamt weniger aufwaendig gestaltet werden.In the Offenlegungsschrift EP1798331 A1 describes a method for dispersing paper pulps. The method is used to disperse a paper pulp, in which a coarse fraction and a fine fraction are formed with the aid of a fractionation device before the dispersion. The fractionation is carried out in such a way that the coarse fraction contains as much fibers as possible and the fine fraction only contains the fines. By the method the z. B. in a disperser carried out dispersion more effective and economical. The overall process can also be designed to be less laborious overall.

Das Dokument DE29518848 U1 betrifft eine Pressenpartie einer Papiermaschine mit geschlossener Bahnfuehrung, mit wenigstens einem Pressspalt und einem Transferspalt, in dem die Papierbahn von einer ersten Walze auf eine zweite Walze uebergeben wird, wobei die Papierbahn auf einem Band mit wenig wasseraufnehmender Oberflaeche ueber die erste Walze gefuehrt ist, und wobei die Papierbahn mit derzweiten Walze in Kontakt steht.The document DE29518848 U1 relates to a press section of a paper machine with a closed web guide, with at least one press nip and a transfer nip, in which the paper web is transferred from a first roller to a second roller, the paper web being guided over the first roller on a belt with little water-absorbing surface, and the paper web being in contact with the second roller.

Im Dokument DE10056138 A1 ist ein Verfahren zur Erhöhung der Stabilität der Bahnränder von Papier-, Karton-, Tissue- oder anderen Faserstoffbahnen in einer Pressenpartie zur Entwässerung derselben beschrieben. Davon ausgehend soll die Stabilität der Bahnränder ohne eine wesentliche negative Beeinflussung der Qualität der fertigen Faserstoffbahn dadurch erhöht werden, dass der Trockengehalt der Bahnränder in und/oder vor der Pressenpartie über den Trockengehalt des mittleren Bereiches der Faserstoffbahn angehoben wird.In the document DE10056138 A1 describes a method for increasing the stability of the web edges of paper, cardboard, tissue or other fibrous webs in a press section for dewatering the same. On this basis, the stability of the web edges should be increased without significantly affecting the quality of the finished fibrous web by increasing the dry content of the web edges in and / or in front of the press section above the dry content of the central area of the fibrous web.

Das Dokument GB934757 A bezieht sich auf ein Verfahren und eine Vorrichtung zur Trocknung einer Papierbahn. Als Trocknungsvorrichtung ist der Aufbau einer Prallströmungstrocknungshaube und deren Anwendung in einer Trockenpartie einer Papiermaschine beschrieben.The document GB934757 A relates to a method and apparatus for drying a paper web. The construction of an impingement drying hood and its application in a drying section of a paper machine is described as the drying device.

Bei den Sackkraftpapiersorten handelt es sich um ein Nischenprodukt im Bereich der Verpackungspapiere. Ungebleichte Sorten werden mit bestehenden Maschinen auf der Basis mehrerer unterschiedlicher Maschinenkonzepte produziert. Dabei werden dehnbare Sackkraftpapier-Sorten auch bereits unter Verwendung einer sogenannten "Extensible Unit", beispielsweise bekannt als Clupak-Einheit, als Staucheinrichtung mit einem elastischen Band hergestellt, durch die noch feuchte Faserstoffbahn gekreppt wird, um deren Dehnungseigenschaften in Bahnlaufrichtung zu verbessern.Sack kraft paper is a niche product in the packaging paper sector. Unbleached grades are produced with existing machines based on several different machine concepts. Here, stretchable sack kraft paper grades are already being used using a so-called "Extensible Unit", for example known as a Clupak unit, manufactured as a compression device with an elastic band through which the still moist fibrous web is creped in order to improve its elongation properties in the direction of web travel.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren sowie eine Vorrichtung zur Herstellung von Verpackungspapier, insbesondere Sackkraftpapier, anzugeben, mit denen unter Aufrechterhaltung einer hohen Qualität des erzeugten Verpackungspapiers die Investitions- und Betriebskosten insgesamt minimiert werden.The invention is based on the object of specifying a method and a device for producing packaging paper, in particular sack kraft paper, with which the investment and operating costs are minimized overall while maintaining a high quality of the packaging paper produced.

Erfindungsgemäß wird diese Aufgabe gelöst durch ein Verfahren zur Herstellung von Verpackungspapier, insbesondere Sackkraftpapier, bei dem in einer Stoffaufbereitung eine Faserstoffsuspension vor einer Hochkonsistenzmahlung auf eine Feststoffkonzentration im Bereich von etwa 30 % bis etwa 35 % eingedickt wird und die Hochkonsistenzmahlung bei einer Feststoffkonzentration im Bereich von etwa 30 % bis etwa 35 % durchgeführt wird, die Faserstoffbahn nach der Hochkonsistenzmahlung einer Niedrigkonsistenzmahlung bei einer Feststoffkonzentration im Bereich von etwa 1 % bis etwa 3 % unterzogen wird, die Faserstoffsuspension mittels eines Stoffauflaufs mit einer Stoffdichte < 0,5 %, insbesondere mit einer Stoffdichte im Bereich von etwa 0,15 % bis etwa 0,25 %, zur Entwässerung und Bildung einer Faserstoffbahn auf das Langsieb eines Langsiebformers oder eines Hybridformers aufgebracht wird, das Langsieb insbesondere im initialen Blattbildungsbereich zu Schüttelbewegungen angeregt wird, und die gebildete Faserstoffbahn in einer Presspartie weiter entwässert und in einer Trockenpartie getrocknet wird. Die Trockenpartie eine Vortrockenpartie und eine Nachtrockenpartie umfasst, und die Vortrockenpartie bevorzugt mehrere Trockengruppen enthält und die Vortrockenpartie maximal zwei einreihige Trockengruppen umfasst und die Vortrockenpartie maximal drei zweireihige Trockengruppen mit insbesondere jeweils maximal acht Trockenzylindern umfasst, getrocknet wird. Dabei wird zumindest einem Trockenzylinder der Nachtrockenpartie eine Impingement-Trocknungseinheit zugeordnet und zwischen der Vortrockenpartie und der Nachtrockenpartie eine mit einem elastischen Band ausgeführte Staucheinrichtung angeordnet wird, um die Faserstoffbahn in Bahnlaufrichtung zu stauchen.According to the invention, this object is achieved by a method for the production of packaging paper, in particular sack kraft paper, in which a pulp suspension is thickened in a stock preparation system to a solids concentration in the range of about 30% to about 35% before high-consistency grinding and the high-consistency grinding at a solids concentration in the range of about 30% to about 35% is carried out, the fibrous web is subjected to a low consistency milling after high-consistency grinding at a solids concentration in the range of about 1% to about 3%, the fibrous suspension by means of a headbox with a consistency of <0.5%, in particular with a Stock consistency in the range from about 0.15% to about 0.25%, for dewatering and formation of a fibrous web is applied to the Fourdrinier wire of a Fourdrinier wire former or a hybrid former, the Fourdrinier wire is excited to shaking movements, especially in the initial sheet forming area, and the formed fibrous web is further dewatered in a press section and dried in a dryer section. The dryer section comprises a pre-dryer section and an after-dryer section, and the pre-dryer section preferably contains several dryer groups and the pre-dryer section comprises a maximum of two single-tier dryer groups and the pre-dryer section comprises a maximum of three double-tier dryer groups with in particular a maximum of eight drying cylinders each. At least one will An impingement drying unit is assigned to the drying cylinder of the after-dryer section and a compression device designed with an elastic belt is arranged between the pre-dryer section and the after-dryer section in order to compress the fibrous web in the direction of travel of the web.

Dabei erfolgt das Eindicken der Faserstoffbahn bevorzugt mittels einer Schneckenpresse oder mittels einer Doppelsiebpresse.The fibrous web is preferably thickened by means of a screw press or a twin-wire press.

Ein Hybridfomer weist ein Langsieb auf, auf dem die Faserstoffbahn im Anfangsbereich lediglich nach einer Seite entwässert wird. Nach dem Anfangsbereich wird die Faserstoffbahn zwischen einem zweiten Entwässerungssieb und dem Langsieb liegend nach beiden Seiten entwässert. Hybridformer sind bei höheren Geschwindigkeiten der Papiermaschine vorteilhaft. Die Entwässerungsleistung wird dadurch erhöht, ohne die Qualität der produzierten Faserstoffbahn zu beeinträchtigen.A hybrid former has a fourdrinier wire on which the fibrous web is only dewatered to one side in the initial area. After the initial area, the fibrous web is dewatered on both sides between a second dewatering wire and the fourdrinier wire. Hybrid formers are at higher speeds the paper machine advantageous. This increases the dewatering performance without impairing the quality of the fibrous web produced.

Mit dem Eindicken wird die in der Faserstoffbahn enthaltene Wassermenge reduziert, wodurch sich entsprechend eine höhere Stoffdichte der Faserstoffsuspension ergibt, die die prozentual in der Faserstoffsuspension noch enthaltene trockene Stoffmenge angibt. Durch die Hochkonsistenzmahlung bei einer Feststoffkonzentration im angegebenen Bereich wird die Festigkeit der später gebildeten verpackungspapierbahn erhöht. Indem das Langsieb des Langsiebformers bzw. Hybridformers zu Schüttelbewegungen angeregt wird, wird die Blattbildung positiv beeinflusst, was eine höhere Festigkeit in der Verpackungspapierbahn mit sich bringt. Bei dem Langsieb des Langsiebformers bzw. Hybridformers handelt es sich um ein endloses umlaufendes Langsiebband. Dabei können insbesondere innerhalb der Schlaufe dieses Langsiebes Entwässerungselemente vorgesehen sein.With the thickening, the amount of water contained in the fibrous web is reduced, which results in a correspondingly higher consistency of the fibrous suspension, which indicates the percentage of dry substance still contained in the fibrous suspension. The high-consistency grinding at a solids concentration in the specified range increases the strength of the later-formed packaging paper web. Since the fourdrinier wire of the Fourdrinier former or hybrid former is excited to shake, the sheet formation is positively influenced, which results in greater strength in the packaging paper web. The Fourdrinier wire of the Fourdrinier former or hybrid former is an endless circulating Fourdrinier belt. In this case, drainage elements can be provided in particular within the loop of this Fourdrinier wire.

Die Siebpartie kann mit einer Siebsaugwalze oder auch ohne eine solche Siebsaugwalze ausgeführt sein. Dabei kann das Langsieb des Langsiebformers bzw. Hybridformers insbesondere am Ende des Blattbildungsbereichs um eine Walze geführt sein, die je nachdem als Siebsaugwalze oder als geschlossene Walze vorgesehen ist.The wire section can be designed with a suction roll or without such a suction roll. The fourdrinier wire of the fourdrinier wire former or hybrid former can be guided around a roller, in particular at the end of the sheet forming area, which is provided as a suction screen roller or as a closed roller, as the case may be.

Bevorzugt wird das Langsieb im initialen Blattbildungsbereich um eine Brustwalze geführt und zur Schüttelung des Langsiebs die Brustwalze mittels einer Schütteleinrichtung beaufschlagt. Dabei kann die Brustwalze insbesondere in Achsrichtung hin- und herbewegt werden, womit das Langsieb quer zur Bahnlaufrichtung verlagert wird.The fourdrinier wire is preferably guided around a breast roller in the initial sheet forming area and the breast roller is acted upon by means of a shaking device in order to shake the fourdrinier wire. The breast roll can be moved back and forth in particular in the axial direction, whereby the fourdrinier wire is displaced transversely to the direction of web travel.

Die Schüttelung des Langsiebs erfolgt bevorzugt mit einer Intensität ≥ 3000, insbesondere ≥ 4000, wobei die Intensität definiert ist durch f2 · H(mm) / v(m/min), mit f = Anregungsfrequenz, H = Hub, v = Bahnlaufgeschwindigkeit.The fourdrinier is preferably shaken with an intensity ≥ 3000, in particular ≥ 4000, the intensity being defined by f 2 · H (mm) / v (m / min), with f = excitation frequency, H = stroke, v = web speed.

Die aus der Pressenpartie austretende Faserstoffbahn weist bevorzugt einen Trockengehalt im Bereich von 35 % bis 45 % und vorzugsweise einen Trockengehalt im Bereich von 40 % auf.The fibrous web emerging from the press section preferably has a dry content in the range from 35% to 45% and preferably a dry content in the range from 40%.

Gemäß einer vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens wird die Faserstoffbahn in der Pressenpartie nur durch einen einzigen Pressnip hindurchgeführt, der durch einen in Bahnlaufrichtung verlängerten, insbesondere als Schuhpressnip vorgesehenen doppelt befilzten Pressnip gebildet ist. Bei der betreffenden Presseinheit kann es sich somit um eine sogenannte SingleNipcoFlex-Presse handeln.According to an advantageous embodiment of the method according to the invention, the fibrous web in the press section is passed through only a single press nip, which is formed by a double-felted press nip which is lengthened in the direction of travel, in particular as a shoe press nip. The press unit in question can therefore be a so-called SingleNipcoFlex press.

Indem die Faserstoffbahn in der Pressenpartie nur durch einen einzigen Pressnip geführt wird, wird sie bei der Entwässerung nicht mehr so stark verdichtet. Damit kann die Porosität des Verpackungspapiers bzw. Sackkraftpapiers auf einem hohen Niveau gehalten werden. Ein betreffender Schuhpressnip kann insbesondere zwischen einer Schuhpresswalze und einer Gegenwalze gebildet sein, wobei die Schuhpresswalze einen flexiblen Walzenmantel besitzt, der über einen Pressschuh geführt ist. Die Faserstoffbahn wird zwischen den beiden Filzen liegend durch den verlängerten Pressnip geführt. Bei den Filzen handelt es sich um endlose umlaufende Filzbänder.As the fibrous web is only passed through a single press nip in the press section, it is no longer compressed as much during dewatering. This means that the porosity of the packaging paper or sack kraft paper can be kept at a high level. A relevant shoe press nip can in particular be formed between a shoe press roll and a counter roll, the shoe press roll having a flexible roll shell which is guided over a press shoe. The fibrous web is passed through the extended press nip lying between the two felts. The felts are endless, circulating felt belts.

Gemäß einer alternativen vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens wird die Faserstoffbahn in der Pressenpartie nur durch zwei hintereinander angeordnete Pressnips hindurchgeführt, die jeweils durch einen in Bahnlaufrichtung verlängerten, insbesondere als Schuhpressnip vorgesehenen Pressnip gebildet sind, wobei der in Bahnlaufrichtung zweite Pressnip insbesondere einfach befilzt und mit einem Transferband versehen ist. Der erste Pressnip kann insbesondere doppelt befilzt sein.According to an alternative advantageous embodiment of the method according to the invention, the fibrous web in the press section is passed through only two press nips arranged one behind the other, each formed by a press nip which is extended in the direction of travel, in particular as a shoe press nip, the second press nip in the direction of travel in particular is simply felted and provided with a transfer ribbon. The first press nip can in particular be double felted.

Dabei handelt es sich bei den Filzen und dem Transferband um endlose umlaufende Filzbänder bzw. ein endloses umlaufendes Transferband. Das Transferband kann zumindest im Wesentlichen impermeabel und glatt ausgeführt sein. Indem die Faserstoffbahn mit einem solchen Transferband durch den zweiten Pressnip geführt wird, erhält die Faserstoffbahn eine glattere Seite, womit das fertige Verpackungspapier bzw. Sackkraftpapier besser bedruckbar ist.The felts and the transfer belt are endless circulating felt belts or an endless circulating transfer belt. The transfer belt can be designed to be at least essentially impermeable and smooth. By guiding the fibrous web with such a transfer belt through the second press nip, the fibrous web is given a smoother side, with which the finished packaging paper or sackcloth paper can be better printed.

Es ist jedoch insbesondere auch eine solche Ausgestaltung des Verfahrens denkbar, bei der die Faserstoffbahn in der Pressenpartie nur durch eine sogenannte DuoCentriNipcoFlex-Presse mit drei aufeinanderfolgenden Pressnips hindurchgeführt wird. Bei der DuoCentriNipcoFlex-Presse handelt es sich um eine kompakte Drei-Nip-Presse, bei der die Unterseite der Faserstoffbahn nur im in Bahnlaufrichtung betrachtet ersten Pressnip mit einem Filz in Kontakt kommt, während in den beiden darauffolgenden Pressnips nur die Oberseite der Faserstoffbahn mit einem Filz in Kontakt gerät und die Unterseite der Faserstoffbahn jeweils mit einer glatten Walze in Berührung kommt. Auch mit einem solchen Pressenkonzept erhält man wieder eine einseitig glatte Papierbahn. Eine auf diese Weise ausgeführte Pressenpartie ist somit ebenso wie eine Pressenpartie mit nur zwei hintereinander angeordneten Pressnips und einem durch den zweiten Pressnip geführten Transferband in besonderer Weise zur Herstellung von insbesondere gebleichten, zu bedruckenden Sackkraftpapier-Sorten geeignet.In particular, however, such an embodiment of the method is also conceivable in which the fibrous web in the press section is only passed through a so-called DuoCentriNipcoFlex press with three successive press nips. The DuoCentriNipcoFlex press is a compact three-nip press in which the underside of the fibrous web only comes into contact with a felt in the first press nip viewed in the direction of web travel, while in the two subsequent press nips only the upper side of the fibrous web comes into contact with one Felt comes into contact and the underside of the fibrous web comes into contact with a smooth roller. With such a press concept, one again obtains a paper web that is smooth on one side. A press section designed in this way, like a press section with only two press nips arranged one behind the other and a transfer belt guided through the second press nip, is particularly suitable for the production of especially bleached sack kraft paper types to be printed.

Die erfindungsgemäße Vorrichtung zur Herstellung von Verpackungspapier, insbesondere Sackkraftpapier, umfasst entsprechend eine Stoffaufbereitung, die eine Eindickeinrichtung aufweist, um eine Faserstoffsuspension auf eine Feststoffkonzentration im Bereich von etwa 30 % bis etwa 35 % einzudicken, sowie Refiner enthält, um die Faserstoffsuspension nach dem Eindicken einer Hochkonsistenzmahlung bei einer Feststoffkonzentration im Bereich von etwa 30% bis etwa 35% sowie nach der Hochkonsistenzmahlung einer Niedrigkonsistenzmahlung bei einer Feststoffkonzentration im Bereich von etwa 1 % bis etwa 3 % zu unterziehen, eine Siebpartie zur Entwässerung der Faserstoffsuspension und zur Bildung einer Faserstoffbahn, die einen Langsiebformer oder Hybridformer umfasst, auf dessen Langsieb die Faserstoffsuspension durch einen Stoffauflauf mit einer Stoffdichte < 0,5 %, insbesondere mit einer Stoffdichte im Bereich von etwa 0,15 % bis etwa 0,25 %, aufbringbar ist, eine Schütteleinrichtung, durch die das Langsieb insbesondere im initialen Blattbildungsbereich zu Schüttelbewegungen anregbar ist, eine Pressenpartie zur weiteren Entwässerung der Faserstoffbahn sowie eine Trockenpartie zur Trocknung der Faserstoffbahn. Die Trockenpartie umfasst eine Vortrockenpartie und eine Nachtrockenpartie, und wobei die Vortrockenpartie bevorzugt mehrere Trockengruppen enthält und die Vortrockenpartie maximal zwei einreihige Trockengruppen umfasst und die Vortrockenpartie maximal drei zweireihige Trockengruppen mit insbesondere jeweils maximal acht Trockenzylindern umfasst. Zumindest einem Trockenzylinder der Nachtrockenpartie eine Impingement-Trocknungseinheit zugeordnet ist und zwischen der Vortrockenpartie und der Nachtrockenpartie eine mit einem elastischen Band ausgeführte Staucheinrichtung angeordnet ist, um die Faserstoffbahn in Bahnlaufrichtung zu stauchen.The device according to the invention for the production of packaging paper, in particular sack kraft paper, accordingly comprises a stock preparation system which has a thickening device in order to thicken a pulp suspension to a solids concentration in the range of about 30% to about 35%, and contains refiners in order to thicken the pulp suspension after a High consistency grinding at a solids concentration in the range of about 30% to about 35% and, after high-consistency grinding, to subjecting a low-consistency grinding at a solids concentration in the range of about 1% to about 3%, a wire section for dewatering the fiber suspension and for the formation of a fiber web, which has a Fourdrinier wire former or hybrid former, on whose fourdrinier the pulp suspension can be applied through a headbox with a consistency of <0.5%, in particular with a consistency in the range from about 0.15% to about 0.25%, a shaking device through which the fourdrinier can be excited to shaking movements in particular in the initial sheet forming area, a press section for further dewatering of the fibrous web and a drying section for drying the fibrous web. The dryer section comprises a pre-dryer section and an after-dryer section, and the pre-dryer section preferably contains several dryer groups and the pre-dryer section comprises a maximum of two single-tier dryer groups and the pre-dryer section comprises a maximum of three double-tier dryer groups with in particular a maximum of eight drying cylinders each. An impingement drying unit is assigned to at least one drying cylinder of the after-dryer section and a compression device designed with an elastic band is arranged between the pre-dryer section and the after-dryer section in order to compress the fibrous web in the direction of travel of the web.

Dabei umfasst die Eindickeinrichtung bevorzugt eine Schneckenpresse oder eine Doppelsiebpresse.The thickening device preferably comprises a screw press or a twin-wire press.

Die Siebpartie kann mit einer Siebsaugwalze oder auch ohne eine solche Siebsaugwalze ausgeführt sein. Dabei kann das Langsieb des Langsiebformers bzw. Hybridformers insbesondere am Ende des Blattbildungsbereichs um eine Walze geführt sein, die je nachdem als Siebsaugwalze oder als geschlossene Walze vorgesehen ist.The wire section can be designed with a suction roll or without such a suction roll. The fourdrinier wire of the fourdrinier wire former or hybrid former can be guided around a roller, in particular at the end of the sheet forming area, which is provided as a suction screen roller or as a closed roller, as the case may be.

Bevorzugt ist zur Schüttelung des Langsiebs eine Schütteleinrichtung vorgesehen, durch die eine Brustwalze beaufschlagbar ist, um die das Langsieb im initialen Blattbildungsbereich geführt ist.A shaking device is preferably provided for shaking the fourdrinier wire, through which a breast roller can be acted upon, around which the fourdrinier wire is guided in the initial sheet forming area.

Bevorzugt ist die Schütteleinrichtung zur Schüttelung des Langsiebs mit einer Intensität ≥ 3000, insbesondere ≥ 4000, ausgeführt, wobei die Intensität definiert ist durch f2 · H(mm) / v(m/min), mit f = Anregungsfrequenz, H = Hub, v = Bahnlaufgeschwindigkeit.The shaking device is preferably designed to shake the wire with an intensity ≥ 3000, in particular ≥ 4000, the intensity being defined by f 2 H (mm) / v (m / min), with f = excitation frequency, H = stroke, v = web speed.

Bevorzugt ist die Vorrichtung so ausgeführt, dass die aus der Pressenpartie austretende Faserstoffbahn einen Trockengehalt im Bereich von 35 % bis 45 % und vorzugsweise einen Trockengehalt im Bereich von 40 % aufweist.The device is preferably designed in such a way that the fibrous web emerging from the press section has a dry content in the range from 35% to 45% and preferably a dry content in the range of 40%.

Gemäß einer vorteilhaften Ausführungsform der erfindungsgemäßen Vorrichtung weist die Pressenpartie nur einen einzigen Pressnip auf, der durch einen in Bahnlaufrichtung verlängerten, insbesondere als Schuhpressnip vorgesehenen, doppelt befilzten Pressnip gebildet ist. Dabei ist der verlängerte Pressnip bevorzugt zur Erzeugung von Pressimpulsen > 55 kPa · s ausgeführt. Die Faserstoffbahn und der untere Filz können nach dem doppelt befilzten verlängerten Pressnip insbesondere mittels eines Trennsaugers von dem oberen Filz getrennt werden, wobei die Faserstoffbahn durch den unteren Filz weitergeführt wird.According to an advantageous embodiment of the device according to the invention, the press section has only a single press nip, which is formed by a double-felted press nip which is lengthened in the direction of travel of the web, in particular provided as a shoe press nip. The extended press nip is preferably designed to generate press pulses> 55 kPa · s. After the double-felted extended press nip, the fibrous web and the lower felt can be separated from the upper felt, in particular by means of a separating suction device, the fibrous web being continued through the lower felt.

Gemäß einer alternativen vorteilhaften Ausführungsform weist die Pressenpartie nur zwei hintereinander angeordnete Pressnips auf, die jeweils durch einen in Bahnlaufrichtung verlängerten, insbesondere als Schuhpressnip vorgesehenen Pressnip gebildet sind, wobei der in Bahnlaufrichtung betrachtet zweite Pressnip insbesondere einfach befilzt und mit einem Transferband versehen ist. Der in Bahnlaufrichtung betrachtet erste Pressnip ist bevorzugt doppelt befilzt.According to an alternative advantageous embodiment, the press section has only two press nips arranged one behind the other, which are each formed by a press nip which is lengthened in the direction of web travel, in particular provided as a shoe press nip, the second press nip, viewed in the direction of travel, in particular being single felted and provided with a transfer band. The first press nip viewed in the direction of travel of the web is preferably double felted.

Gemäß einer weiteren alternativen Ausführungsform der erfindungsgemäßen Vorrichtung weist die Pressenpartie nur eine DuoCentriNipcoFlex-Presse mit drei aufeinanderfolgenden Pressnips auf.According to a further alternative embodiment of the device according to the invention, the press section has only one DuoCentriNipcoFlex press with three successive press nips.

Der Stoffauflauf ist bevorzugt mit einer Verdünnungswasserregelung ausgerüstet.The headbox is preferably equipped with a dilution water control.

Mit einer solchen Verdünnungswasserregelung wird insbesondere die Möglichkeit geschaffen, den Durchsatz, die Feststoffdichte und somit das Flächengewicht und die Faserorientierung sektional über die Breite der Faserstoffbahn in Zonen zu regeln. Das Flächengewichtsquerprofil der Faserstoffbahn kann dadurch geregelt werden, dass an zu schweren Stellen im oder vor dem Stoffauflauf mehr Wasser in die entsprechende Zone zugeführt wird und somit die Stoffdichte in der Faserstoffsuspension in dieser Zone reduziert wird. Bei zu leichten Stellen erfolgt die Regelung in umgekehrter Weise. Mit einem entsprechend verbesserten Flächengewichtsquerprofil der Faserstoffbahn werden eine gleichmäßigere Porosität, Festigkeit und Dehnfähigkeit des Sackkraftpapiers über die Breite der Papierbahn erreicht.With such a dilution water regulation, in particular, the possibility is created to regulate the throughput, the solids density and thus the weight per unit area and the fiber orientation sectionally over the width of the fiber web in zones. The basis weight cross profile of the fibrous web can be regulated by adding more water to the corresponding zone at places that are too heavy in or in front of the headbox and thus reducing the consistency of the fibrous suspension in this zone. If the spots are too light, the Regulation in reverse. With a correspondingly improved basis weight transverse profile of the fibrous web, a more uniform porosity, strength and elasticity of the sackcloth paper are achieved across the width of the paper web.

Von Vorteil ist insbesondere auch, wenn ein jeweiliger in Bahnlaufrichtung verlängerter Pressnip eine Länge > 220 mm, insbesondere > 270 mm, aufweist.It is also particularly advantageous if a respective press nip extended in the direction of web travel has a length> 220 mm, in particular> 270 mm.

Mit einem entsprechend langen Pressnip ergibt sich ein höherer Trockengehalt der Faserstoffbahn.A correspondingly long press nip results in a higher dry content of the fibrous web.

Die Trockenpartie umfasst eine Vortrockenpartie und eine Nachtrockenpartie. Dabei enthält die Vortrockenpartie bevorzugt mehrere insbesondere kurze Trockengruppen.The dryer section comprises a pre-dryer section and an after-dryer section. The pre-dryer section preferably contains several, in particular short, dryer groups.

Die Vortrockenpartie umfasst maximal zwei einreihige Trockengruppen.The pre-dryer section comprises a maximum of two single-tier dryer groups.

Die Vortrockenpartie umfasst maximal drei zweireihige Trockengruppen mit insbesondere jeweils maximal acht Trockenzylindern.
Gemäß einer bevorzugten praktischen Ausführungsform der erfindungsgemäßen Vorrichtung umfasst die Vortrockenpartie wenigstens einen Düsenfeuchter zur Feuchtequerprofilierung. Ein solcher Düsenfeuchter ist insbesondere dann bevorzugt, wenn die Pressenpartie mit nur einem in Bahnlaufrichtung verlängerten Pressnip bzw. Schuhpressnip versehen ist. Grundsätzlich ist der Einsatz eines solchen Düsenfeuchters jedoch auch in Zusammenhang mit den anderen Pressenkonzepten denkbar. Die Trockenpartie umfasst eine insbesondere als sogenannte "Extensible Unit" mit einem elastischen Band ausgeführte Staucheinrichtung, um die Faserstoffbahn in Bahnlaufrichtung zu stauchen. Dabei weist die Faserstoffbahn vor der Staucheinrichtung bevorzugt einen Trockengehalt im Bereich von etwa 62 % bis etwa 68 % auf.The pre-dryer section comprises a maximum of three two-tier dryer groups with in particular a maximum of eight drying cylinders each.
According to a preferred practical embodiment of the device according to the invention, the pre-dryer section comprises at least one nozzle moistener for moisture transverse profiling. Such a nozzle humidifier is particularly preferred when the press section is provided with only one press nip or shoe press nip which is elongated in the direction of travel of the web. In principle, however, the use of such a nozzle humidifier is also conceivable in connection with the other press concepts. The dryer section comprises an upsetting device, designed in particular as a so-called "extensible unit" with an elastic belt, in order to compress the fibrous web in the direction of travel of the web. The fibrous web in front of the upsetting device preferably has a dry content in the range from approximately 62% to approximately 68%.

Die Faserstoffbahn wird durch das Zusammenziehen des entlasteten elastischen Bandes der Staucheinrichtung ("Extensible Unit") in Bahnlaufrichtung gestaucht, womit sich ein Krepp-Effekt einstellt. Hierbei ergibt sich in der Regel über der Staucheinrichtung ein negativer Zug. Bevorzugt ist die Faserstoffbahn mittels der Staucheinrichtung mit einem negativen Zug beaufschlagbar, der durch eine Geschwindigkeitsdifferenz in einem Bereich von etwa -1 % bis etwa -5 % definiert ist. Ein negativer Zug von etwa -3 % ist beispielsweise bei "SemiExtensible"-Sorten, d.h. bei Sorten mittlerer Dehnbarkeit von Vorteil. Demgegenüber ist bei "Extensible"-Sorten, d.h. bei Sorten höherer Dehnbarkeit, ein negativer Zug bis zu -5 % denkbar.The fibrous web is compressed in the direction of travel of the web by pulling together the relieved elastic band of the compression device ("Extensible Unit"), which results in a crepe effect. This usually results in a negative pull over the upsetting device. The fibrous web can preferably be subjected to a negative tension by means of the upsetting device, which is defined by a speed difference in a range from approximately -1% to approximately -5%. A negative tension of around -3% is advantageous for "SemiExtensible" grades, i.e. grades with medium elasticity. In contrast, with "Extensible" types, i.e. with types with higher elasticity, a negative tension of up to -5% is conceivable.

Das flexible Band der Staucheinrichtung ("Extensible Unit") ist zweckmäßigerweise auf der nicht glatten Oberseite der Faserstoffbahn positioniert, um deren glatte Seite nicht zu zerstören. Im Fall einer Pressenpartie mit einer DuoCentriNipcoFlex-Presse ist die Unterseite der Faserstoffbahn glatt. Bei einer Presseinheit mit nur einem verlängerten Pressnip sind beide Seiten der Faserstoffbahn im Wesentlichen gleich glatt. Dennoch kann auch in diesem Fall das flexible Band einer Staucheinrichtung ("Extensible Unit") gegebenenfalls auf der Oberseite der Faserstoffbahn positioniert werden, um eine gute Runability oder Maschinengängigkeit zu gewährleisten und die Ausführung möglichst einfach zu halten.The flexible band of the compression device ("Extensible Unit") is expediently positioned on the non-smooth upper side of the fibrous web in order not to destroy its smooth side. In the case of a press section with a DuoCentriNipcoFlex press, the underside of the fibrous web is smooth. In the case of a press unit with only one extended press nip, both sides of the fibrous web are essentially equally smooth. Nevertheless, in this case too, the flexible band of a compression device ("Extensible Unit") can optionally be positioned on the upper side of the fibrous web in order to ensure good runability or machinability and to keep the execution as simple as possible.

Zumindest einem Trockenzylinder der Nachtrockenpartie ist eine Impingement-Trocknungseinheit zugeordnet. Eine Impingement-Trocknung basiert auf einer Wärmeübertragung durch Konvektion infolge des Aufpralls ("impingement") von Luftstrahlen auf die Faserstoffbahn.An impingement drying unit is assigned to at least one drying cylinder of the after-dryer section. Impingement drying is based on heat transfer by convection as a result of the impact ("impingement") of air jets on the fibrous web.

Dabei ist eine jeweilige Impingement-Trocknungseinheit direkt über der unbefilzten Faserstoffbahn positioniert, damit die Faserstoffbahn unbehindert durch einen Filz frei schrumpfen kann. In einer zweireihigen Trockengruppe kann eine entsprechende Impingement- oder Prallströmungstrocknung insbesondere über die oben liegenden Trockenzylinder erfolgen. Grundsätzlich können solche Impingement-Trocknungseinheiten jedoch sowohl an oben liegenden als auch an unten liegenden Trockenzylindern positioniert sein.A respective impingement drying unit is positioned directly above the non-felted fibrous web so that the fibrous web can shrink freely through a felt. In a two-tier drying group, a corresponding impingement or impingement flow drying can take place, in particular via the drying cylinders located at the top. In principle, however, such impingement drying units can be positioned both on top and bottom drying cylinders.

Der Trockenpartie bzw. Nachtrockenpartie ist zweckmäßigerweise ein Aufroller nachgeordnet, wobei die Faserstoffbahn durch diesen Aufroller bevorzugt bei einem Trockengehalt im Bereich von etwa 92 % bis etwa 94 % aufrollbar ist.A winder is expediently arranged downstream of the dryer section or after-dryer section, the fibrous web being able to be rolled up by this winder preferably at a dry content in the range from about 92% to about 94%.

Die Erfindung wird im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:

Fig. 1
eine schematische Darstellung einer beispielhaften Ausführungsform einer erfindungsgemäßen Vorrichtung zur Herstellung von Verpackungspapier, insbesondere Sackkraftpapier, und
Fig. 2
eine detailliertere schematische Darstellung der Pressenpartie der Vorrichtung gemäß Fig. 1.
The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawing; in this show:
Fig. 1
a schematic representation of an exemplary embodiment of a device according to the invention for the production of packaging paper, in particular sack kraft paper, and
Fig. 2
a more detailed schematic representation of the press section of the device according to FIG Fig. 1 .

Die Fig. 1 und 2 zeigen in schematischer Darstellung eine beispielhafte Ausführungsform einer erfindungsgemäßen Vorrichtung 10 zur Herstellung von Verpackungspapier, insbesondere Sackkraftpapier.the Fig. 1 and 2 show a schematic representation of an exemplary embodiment of a device 10 according to the invention for the production of packaging paper, in particular sack kraft paper.

Die Vorrichtung umfasst eine Stoffaufbereitung 12, eine Siebpartie 14 zur Entwässerung einer Faserstoffsuspension und zur Bildung einer Faserstoffbahn, eine Pressenpartie 16 zur weiteren Entwässerung der Faserstoffbahn sowie eine Trockenpartie 18 zur Trocknung der Faserstoffbahn.The device comprises a stock preparation unit 12, a wire section 14 for dewatering a fiber suspension and for forming a fiber web, a press section 16 for further dewatering the fiber web and a drying section 18 for drying the fiber web.

Die Stoffaufbereitung 12 umfasst eine Eindickeinrichtung 20, um die Faserstoffsuspension auf eine Feststoffkonzentration im Bereich von etwa 30 % bis etwa 35 % einzudicken, sowie Refiner 22, 24, um die Faserstoffsuspension nach dem Eindicken einer Hochkonsistenzmahlung sowie nach der Hochkonsistenzmahlung einer Niedrigkonsistenzmahlung bei einer Feststoffkonzentration im Bereich von etwa 1 % bis etwa 3 % zu unterziehen. Der Refiner 22 dient also einer Hochkonsistenzmahlung, während der diesem nachgeordnete Refiner 24 einer Niedrigkonsistenzmahlung dient.The stock preparation 12 comprises a thickening device 20 to thicken the pulp suspension to a solids concentration in the range of about 30% to about 35%, as well as refiners 22, 24 to thicken the pulp suspension after thickening a high consistency grinding and after the high consistency grinding a low consistency grinding at a solids concentration in Subject to range from about 1% to about 3%. The refiner 22 is therefore used for high-consistency grinding, while the refiner 24 arranged downstream of it is used for low-consistency grinding.

Die Siebpartie 14 umfasst einen Langsiebformer, auf dessen Langsieb 26 die Faserstoffsuspension durch einen Stoffauflauf 28 mit einer Stoffdichte < 0,5 %, insbesondere mit einer Stoffdichte im Bereich von etwa 0,15 % bis etwa 0,25 %, aufbringbar ist. Grundsätzlich könnte es sich bei dem Langsieb auch um das Langsieb eines Hybridformers handeln.The wire section 14 comprises a fourdrinier wire former, on the fourdrinier wire 26 of which the fiber suspension can be applied through a headbox 28 with a stock consistency <0.5%, in particular with a stock consistency in the range from about 0.15% to about 0.25%. In principle, the fourdrinier wire could also be the fourdrinier wire of a hybrid former.

Der Siebpartie 14 ist eine (nicht gezeigte) Schütteleinrichtung zugeordnet, durch die das Langsieb insbesondere im initialen Blattbildungsbereich zu Schüttelbewegungen anregbar ist.The wire section 14 is assigned a shaking device (not shown) by means of which the fourdrinier wire can be excited to shake movements, particularly in the initial sheet forming area.

Die Eindickeinrichtung 20 kann, wie dargestellt, insbesondere eine Schneckenpresse umfassen. Die Eindickung kann jedoch auch mittels einer Doppelsiebpresse erfolgen.As shown, the thickening device 20 can in particular comprise a screw press. The thickening can, however, also take place using a twin-wire press.

Das endlose umlaufende Langsieb 26 ist im initialen Blattbildungsbereich um eine Brustwalze 30 geführt. Dabei kann zur Schüttelung des Langsiebs 26 insbesondere diese Brustwalze 30 durch die Schütteleinrichtung beaufschlagbar sein. Die Schütteleinrichtung kann insbesondere so ausgeführt sein, dass das Langsieb 26 mit einer Intensität ≥ 3000, insbesondere ≥ 4000 geschüttelt wird, wobei die Intensität definiert ist durch f2 · H(mm) / v(m/min), mit f = Anregungsfrequenz, H = Hub, v = Bahnlaufgeschwindigkeit.The endless revolving Fourdrinier wire 26 is guided around a breast roller 30 in the initial sheet forming area. To shake the Fourdrinier wire 26, in particular this breast roller 30 can be acted upon by the shaking device. The shaking device can in particular be designed so that the fourdrinier wire 26 is shaken with an intensity ≥ 3000, in particular ≥ 4000, the intensity being defined by f 2 H (mm) / v (m / min), with f = excitation frequency, H = stroke, v = web speed.

Die Vorrichtung 20 kann insbesondere so ausgeführt bzw. betrieben sein, dass die aus der Pressenpartie 18 austretende Faserstoffbahn einen Trockengehalt im Bereich von 35 % bis 45 % und vorzugsweise einen Trockengehalt im Bereich von 40 % aufweist.The device 20 can in particular be designed or operated in such a way that the fibrous web emerging from the press section 18 has a dry content in the range of 35% to 45% and preferably a dry content in the range of 40%.

Die Pressenpartie 16 weist im vorliegenden Fall nur einen einzigen Pressnip 32 (siehe Fig. 2) auf, der durch einen in Bahnlaufrichtung L verlängerten, insbesondere als Schuhpressnip vorgesehenen, doppelt befilzten Pressnip gebildet ist. Dabei ist dieser Pressnip 32 zwischen zwei Presswalzen 34, 36 gebildet, von denen eine als Schuhpresswalze mit einem über einen Pressschuh geführten flexiblen Walzenmantel ausgeführt ist. Die Faserstoffbahn ist zwischen einem oberen Filz 38 und einem unteren Filz 40 liegend durch den verlängerten Pressnip 32 geführt. Bei der betreffenden Presseinheit handelt es sich somit um eine sogenannte SingleNipcoFlex-Presse. Die Presseinheit kann insbesondere zur Erzeugung von Pressimpulsen > 55 kPa · s in dem Pressnip 32 ausgeführt sein.In the present case, the press section 16 has only a single press nip 32 (see Fig. 2 ), which is formed by a double-felted press nip which is lengthened in the direction of web travel L, in particular as a shoe press nip. This press nip 32 is formed between two press rolls 34, 36, one of which is designed as a shoe press roll with a flexible roll shell guided over a press shoe. The fibrous web is guided through the elongated press nip 32 lying between an upper felt 38 and a lower felt 40. The press unit in question is therefore a so-called SingleNipcoFlex press. The press unit can be designed in particular to generate press pulses> 55 kPa · s in the press nip 32.

Die Faserstoffbahn und der untere Filz 40 werden nach dem doppelt befilzten verlängerten Pressnip 32 im vorliegenden Fall beispielsweise mittels eines Trennsaugers 42 von dem oberen Filz 38 getrennt, so dass die Faserstoffbahn durch den unteren Filz 40 weitergeführt wird.The fibrous web and the lower felt 40 are separated from the upper felt 38 after the double-felted extended press nip 32 in the present case, for example by means of a separating suction device 42, so that the fibrous web is continued through the lower felt 40.

Es ist jedoch alternativ auch eine Pressenpartie mit nur zwei hintereinander angeordneten Pressnips denkbar, die jeweils durch einen in Bahnlaufrichtung verlängerten, insbesondere als Schuhpressnip vorgesehenen Pressnip gebildet sind, wobei der in Bahnlaufrichtung betrachtet zweite Pressnip insbesondere einfach befilzt und mit einem Transferband versehen sein kann. Gemäß einer weiteren alternativen Ausführungsform kann die Pressenpartie 16 auch nur eine DuoCentriNipcoFlex-Presse mit drei aufeinanderfolgenden Pressnips aufweisen.Alternatively, however, a press section with only two press nips arranged one behind the other is also conceivable, each of which is formed by a press nip which is lengthened in the direction of web travel, in particular as a shoe press nip, wherein the second press nip viewed in the direction of travel of the web can in particular be simply felted and provided with a transfer band. According to a further alternative embodiment, the press section 16 can also have only one DuoCentriNipcoFlex press with three successive press nips.

Der Stoffauflauf 28 kann mit einer Verdünnungswasserregelung versehen sein.The headbox 28 can be provided with a dilution water control.

Die Siebpartie 14 kann mit einer Siebsaugwalze oder auch ohne eine solche Siebsaugwalze ausgeführt sein. Dabei ist das Langsieb 26 am Ende des Blattbildungsbereichs um eine Walze 44 geführt, die je nachdem als Siebsaugwalze oder als geschlossene Walze ausgeführt sein kann. Als Siebsaugwalze kann gegebenenfalls eine Hochvakuum-Siebsaugwalze vorgesehen sein.The wire section 14 can be designed with a suction roll or without such a suction roll. In this case, the fourdrinier wire 26 is guided around a roller 44 at the end of the sheet forming area, which, depending on the case, can be designed as a suction screen roller or as a closed roller. A high vacuum suction roll can optionally be provided as the suction roll.

Der verlängerte Pressnip 32 der die beiden Presswalzen 34, 36 umfassenden Schuhpresseinheit kann insbesondere eine Länge > 220 mm, vorzugsweise größer 270 mm, aufweisen.The extended press nip 32 of the shoe press unit comprising the two press rollers 34, 36 can in particular have a length> 220 mm, preferably greater than 270 mm.

Die Trockenpartie 18 umfasst eine Vortrockenpartie 181 und eine Nachtrockenpartie 182.The dryer section 18 comprises a pre-dryer section 18 1 and an after-dryer section 18 2 .

Dabei enthält die Vortrockenpartie 181 bevorzugt mehrere, insbesondere kurze Trockenkuppen. Bevorzugt umfasst die Vortrockenpartie 181 ein oder zwei einreihige Trockengruppen und/oder eins bis drei zweireihige Trockengruppen mit insbesondere jeweils maximal acht Trockenzylindern 46.The pre-dryer section 18 1 preferably contains several, in particular short, drying peaks. The pre-dryer section 18 1 preferably comprises one or two single-tier dryer groups and / or one to three two-tier dryer groups, in particular each with a maximum of eight drying cylinders 46.

Zudem kann die Vortrockenpartie 181 insbesondere auch wenigstens einen Düsenfeuchter 48 zur Feuchtequerprofilierung umfassen. Ein solcher Düsenfeuchter ist insbesondere dann von Vorteil, wenn die Pressenpartie 16 mit einer SingleNipcoFlex-Presse versehen ist.In addition, the pre-dryer section 18 1 can in particular also comprise at least one nozzle humidifier 48 for moisture transverse profiling. Such a nozzle humidifier is particularly advantageous when the press section 16 is provided with a SingleNipcoFlex press.

Die Trockenpartie 18 umfasst auch eine beispielsweise zwischen der Vortrockenpartie 181 und der Nachtrockenpartie 182 angeordnete, insbesondere als sogenannte "Extensible Unit" mit einem elastischen Band 52 ausgeführte Staucheinrichtung 50, um die Faserstoffbahn in Bahnlaufrichtung L zu stauchen. Dabei ist das flexible Band 52 dieser Staucheinrichtung 50 auf der Oberseite der Faserstoffbahn positioniert. Dies ist insbesondere auch in den Fällen von Vorteil, wenn die Pressenpartie 16 mit einer zwei verlängerte Pressnips besitzenden TandemNipcoFlex-Presse oder einer DuoCentriNipcoFlex-Presse versehen ist, um sicherzustellen, dass die glatte Unterseite der Faserstoffbahn nicht zerstört wird. Dabei besitzt die Faserstoffbahn vor der Staucheinrichtung 50 bevorzugt einen Trockengehalt im Bereich von etwa 62 % bis etwa 68 %.The dryer section 18 also comprises an upsetting device 50, which is arranged, for example, between the pre-dryer section 18 1 and the after-dryer section 18 2 , in particular designed as a so-called "extensible unit" with an elastic band 52, in order to compress the fibrous web in the direction L of travel. The flexible band 52 of this upsetting device 50 is positioned on the upper side of the fibrous web. This is particularly advantageous when the press section 16 is provided with a TandemNipcoFlex press with two extended press nips or a DuoCentriNipcoFlex press in order to ensure that the smooth underside of the fibrous web is not destroyed. The fibrous web in front of the upsetting device 50 preferably has a dry content in the range from approximately 62% to approximately 68%.

Mittels der Staucheinrichtung 50 wird die Faserstoffbahn zweckmäßigerweise mit einem negativen Zug beaufschlagt, der durch eine Geschwindigkeitsdifferenz in einem Bereich von etwa -1 % bis etwa -5 % definiert ist.By means of the upsetting device 50, a negative tension is expediently applied to the fibrous web, which is defined by a speed difference in a range from approximately -1% to approximately -5%.

Zumindest einen Trockenzylinder 46 der Nachtrockenpartie 182 ist eine Impingement-Trocknungseinheit 54 zugeordnet, wobei im vorliegenden Fall mehreren Trockenzylindern jeweils eine solche Impingement-Trocknungseinheit 54 zugeordnet ist.At least one drying cylinder 46 of the after-dryer section 18 2 is assigned an impingement drying unit 54, wherein in the present case one such impingement drying unit 54 is assigned to a plurality of drying cylinders.

Der Trockenpartie 18 bzw. der Nachtrockenpartie 182 ist ein Aufroller 56 nachgeordnet. Dabei kann die Faserstoffbahn durch diesen Aufroller 56 insbesondere bei einem Trockengehalt im Bereich von etwa 92 % bis etwa 94 % aufgerollt werden.The dryer section 18 or the after-dryer section 18 2 is followed by a reel 56. The fibrous web can be rolled up by this winder 56, in particular with a dry content in the range from approximately 92% to approximately 94%.

BezugszeichenlisteList of reference symbols

1010
Vorrichtungcontraption
1212th
StoffaufbereitungStock preparation
1414th
SiebpartieWire section
1616
PressenpartiePress section
1818th
TrockenpartieDryer section
181181
VortrockenpartiePre-dryer section
182182
NachtrockenpartieAfter-dryer section
2020th
EindickeinrichtungThickening device
2222nd
RefinerRefiner
2424
RefinerRefiner
2626th
LangsiebFourdrinier
2828
StoffauflaufHeadbox
3030th
BrustwalzeBreast roll
3232
PressnipPress nip
3434
PresswalzePress roll
3636
PresswalzePress roll
3838
oberer Filzupper felt
4040
unterer Filzlower felt
4242
TrennsaugerSeparating sucker
4444
Walzeroller
4646
TrockenzylinderDrying cylinder
4848
DüsenfeuchterNozzle humidifier
5050
StaucheinrichtungUpsetting device
5252
elastisches Bandelastic band
5454
Impingement-TrocknungseinheitImpingement drying unit
5656
AufrollerReel
LL.
BahnlaufrichtungDirection of web travel

Claims (11)

  1. Method for producing packaging paper, in particular sack kraft paper, in which, in a stock preparation system (12), a pulp suspension is thickened to a solids concentration in the range from about 30% to about 35% before high-consistency refining, and the high-consistency refining is carried out at a solids concentration in the range from about 30% to about 35%, after the high-consistency refining, the pulp suspension is subjected to low-consistency refining at a solids concentration in the range from about 1% to about 3%, by means of a headbox (28), the pulp suspension having a consistency < 0.5%, in particular having a consistency in the range from about 0.15% to about 0.25%, is applied to the Fourdrinier wire (26) of a Fourdrinier former or a hybrid former for dewatering and forming a fibrous web, the Fourdrinier wire (26) is excited into shaking movements, in particular in the initial sheet forming area, and the fibrous web formed is further dewatered in a press section (16) and dried in a drying section (18), wherein the drying section (18) comprises a pre-dryer section (181) and an after-dryer section (182), and wherein the pre-dryer section (181) preferably contains multiple dryer groups and the pre-dryer section (181) comprises a maximum of two single-row dryer groups, and the pre-dryer section (181) comprises a maximum of three two-row dryer groups each in particular having a maximum of eight drying cylinders (46), and wherein at least one drying cylinder (46) of the after-dryer section (182) is assigned an impingement dryer unit (54), and a Clupak device (50) equipped with an elastic belt is arranged between the pre-dryer section (181) and the after-dryer section (182) in order to compress the fibrous web in the web running direction (L).
  2. Method according to Claim 1,
    characterized in that the fibrous web is thickened by means of a screw press or by means of a twin-wire press.
  3. Method according to Claim 1 or 2,
    characterized in that the fibrous web emerging from the press section (16) has a dryness in the range from 35% to 45% and preferably a dryness in the region of 40%.
  4. Device (10) for producing packaging paper, in particular sack kraft paper, in particular for carrying out the method according to one of the preceding claims, having a stock preparation system (12) which comprises a thickening device (20) in order to thicken a pulp suspension to a solids concentration in the range from about 30% to about 35%, and refiners (22, 24) in order to subject the pulp suspension following the thickening to high-consistency refining at a solids concentration in the range from about 30% to about 35% and, after the high-consistency refining, to low-consistency refining at a solids concentration in the range from about 1% to about 3%, having a wire section (14) for dewatering the pulp suspension and for forming a fibrous web, which comprises a Fourdrinier former or hybrid former, to the Fourdrinier wire (26) of which the pulp suspension can be applied by a headbox (28) with a consistency < 0.5%, in particular with a consistency in the range from about 0.15% to about 0.25%, having a shaking device, by means of which the Fourdrinier wire (26) can be excited into shaking movements, in particular in the initial sheet forming area, having a press section (16) for the further dewatering of the fibrous web and having a drying section (18) for drying the fibrous web, wherein the drying section (18) comprises a pre-dryer section (181) and an after-dryer section (182), and wherein the pre-dryer section (181) preferably contains multiple dryer groups and the pre-dryer section (181) comprises a maximum of two single-row dryer groups, and the pre-dryer section (181) comprises a maximum of three two-row dryer groups each in particular having a maximum of eight drying cylinders (46), and at least one drying cylinder (46) of the after-dryer section (182) is assigned an impingement dryer unit (54), and a Clupak device (50) equipped with an elastic belt is arranged between the pre-dryer section (181) and the after-dryer section (182) in order to compress the fibrous web in the web running direction (L) .
  5. Device according to Claim 4,
    characterized in that the thickening device (20) comprises a screw press or a twin-wire press.
  6. Device according to Claim 4 or 5,
    characterized in that it is designed in such a way that the fibrous web emerging from the press section (16) has a dryness in the range from 35% to 45% and preferably a dryness in the region of 40%.
  7. Device according to one of Claims 4 to 6,
    characterized in that the press section (16) has only a single press nip (32), which is formed by a double-felted press nip that is extended in the web running direction (L), in particular provided as a shoe press nip.
  8. Device according to one of Claims 4 to 6,
    characterized in that the press section (16) has only two press nips arranged one after the other, which are each formed by a press nip that is extended in the web running direction (L), in particular provided as a shoe press nip, wherein the second press nip, viewed in the web running direction (L), is in particular single-felted and provided with a transfer belt.
  9. Device according to Claim 7 or 8,
    characterized in that a respective press nip that is extended in the web running direction (32) has a length > 220 mm, in particular > 270 mm.
  10. Device according to Claim 4,
    characterized in that the pre-dryer section (181) comprises at least one nozzle moistener (48) for moisture transverse profiling.
  11. Device according to one of Claims 4 to 10,
    characterized in that before the Clupak device (50), the fibrous web has a dryness in the range from about 62% to about 68%.
EP15797057.5A 2014-11-28 2015-11-16 Method and device for producing packaging paper Active EP3224409B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014224358 2014-11-28
PCT/EP2015/076650 WO2016083170A1 (en) 2014-11-28 2015-11-16 Method and device for producing packaging paper

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EP3224409A1 EP3224409A1 (en) 2017-10-04
EP3224409B1 true EP3224409B1 (en) 2021-08-18

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WO (1) WO2016083170A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3385442B1 (en) * 2017-04-06 2019-04-24 BillerudKorsnäs AB Method of rpoducing a highly stretchable paper
CN116575253A (en) * 2018-01-05 2023-08-11 国际纸业公司 Paper product with increased bending stiffness and transverse strength and method of making same
DE102018121155A1 (en) * 2018-08-30 2020-03-05 Voith Patent Gmbh METHOD AND MACHINE FOR PRODUCING A MULTI-LAYER FIBROUS MATERIAL
HU231176B1 (en) 2019-03-20 2021-06-28 Celltech-Paper Kft. Process for the recycling of waste paper containing cotton fibers at least partially coated with a wet curing material in the manufacture of absorbent pads, and packaging material made from waste paper recyclable by the process
DE102019134177A1 (en) * 2019-12-12 2021-06-17 Voith Patent Gmbh Machine and method for producing a fibrous web
CN112431060B (en) * 2020-11-13 2022-10-21 福建省青山纸业股份有限公司 Production method of environment-friendly craft paper
DE102021103519A1 (en) * 2021-02-15 2022-08-18 Koehler Innovation & Technology Gmbh Process for the production of a fibrous web
CN112878089B (en) * 2021-03-18 2023-02-14 山鹰纸业(广东)有限公司 Preparation method of high-breaking-resistance kraft paper
DE102021114127A1 (en) 2021-06-01 2022-12-01 Voith Patent Gmbh Process for drying and increasing the transverse elongation of a liner paper web in high-speed paper machines
DE102021131068A1 (en) 2021-11-26 2023-06-01 Voith Patent Gmbh Process and machine for producing a fibrous web, in particular a sack kraft paper web, with increased stretch properties
DE102022104414A1 (en) 2022-02-24 2023-08-24 Voith Patent Gmbh Process and paper machine for the production of a sack kraft paper web with improved compression during further transport
DE102022112687A1 (en) 2022-05-20 2023-11-23 Voith Patent Gmbh Method and machine for increasing the transverse elongation of a testliner paper web in high-speed paper machines

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL268857A (en) * 1960-09-02
DE19543111C2 (en) * 1995-11-18 2001-01-25 Voith Sulzer Papiermasch Gmbh Press section of a paper machine with closed web guidance and method for dewatering a paper web
SE510506C2 (en) * 1997-07-09 1999-05-31 Assidomaen Ab Kraft paper and process for making this and valve bag
DE10056138A1 (en) * 2000-11-13 2002-05-23 Voith Paper Patent Gmbh Press section for the extraction of water from a wet web, or paper or tissue or cardboard, sets the dry content at a raised level at the edges in and/or before the press section to increase the web stability
CN2469034Y (en) * 2001-03-05 2002-01-02 华中科技大学 Double web, high efficiency and concentrating type press
SE525144C2 (en) * 2003-05-06 2004-12-07 Metso Paper Inc Method and apparatus for a double-wire press
EP1798331B1 (en) * 2005-12-17 2010-05-26 Voith Patent GmbH Process for dispersing pulp
CN101148851B (en) * 2007-11-01 2010-06-02 无烟国际文化发展（北京）有限公司 Green regeneration bank note
JP2011099180A (en) * 2009-11-06 2011-05-19 Seed:Kk Pulp concentration adjusting method for used paper recycling apparatus, pulp concentration adjusting device of used paper recycling apparatus, and used paper recycling apparatus
DE102010029580A1 (en) * 2010-06-01 2011-12-01 Voith Patent Gmbh Machine for producing a paper web, in particular a sack paper web

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WO2016083170A1 (en) 2016-06-02
RU2676489C1 (en) 2018-12-29
EP3224409A1 (en) 2017-10-04
BR112017010990A2 (en) 2017-12-26
CN107073865A (en) 2017-08-18
CN107073865B (en) 2020-10-20

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