EP1842961A1 - Procédé et dispositif de traitement d'une bande de matière fibreuse - Google Patents

Procédé et dispositif de traitement d'une bande de matière fibreuse Download PDF

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Publication number
EP1842961A1
EP1842961A1 EP07103019A EP07103019A EP1842961A1 EP 1842961 A1 EP1842961 A1 EP 1842961A1 EP 07103019 A EP07103019 A EP 07103019A EP 07103019 A EP07103019 A EP 07103019A EP 1842961 A1 EP1842961 A1 EP 1842961A1
Authority
EP
European Patent Office
Prior art keywords
web
range
glue
press
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07103019A
Other languages
German (de)
English (en)
Inventor
Daniel Gronych
Georg Dr. Kleiser
Robert Koplin
John Bergman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1842961A1 publication Critical patent/EP1842961A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/009—Apparatus for glaze-coating paper webs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/30—Pretreatment of the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents

Definitions

  • the invention relates to a method for treating a web of fibrous material, wherein the web is passed from a wire section in a press section and dewatered there and then dried and provided with a glue application.
  • the invention relates to an apparatus for treating a web of pulp with a wire section, a press section, a dryer section and a glue applicator.
  • the invention will be described below with reference to the treatment of a fibrous web from which ultimately a paper, in particular a wood-free writing or copying paper, is obtained. But it is also applicable to similar webs of fibrous material, such as cardboard or the like.
  • a fiber suspension in the wire section is usually applied to a rotating screen.
  • the fibrous web forming on the wire is then transferred from the wire section to the press section.
  • the press section In the press section, a significant part of the moisture from the fibrous web to be removed, by pressing.
  • a particularly economical procedure is that one uses only a single press or a tandem or combination press in the press section, which accordingly also has only a single press nip or a few press nips.
  • it is necessary to use coverings with high dewatering performance which in turn has a relatively high porosity (for copy paper woodfree example, about 1100 ml / min Bendtsen) and a very high raw paper roughness (copy paper woodfree, top about 1000 to 1300 ml / min Bendtsen).
  • This roughness is far too high to meet market requirements.
  • the finished paper must later have a certain strength.
  • One measure to accomplish this is to reduce the specific volume, i. set the bulk as high as possible.
  • the paper is often subjected to surface sizing in the dryer section, usually after a pre-drying section or pre-drying section.
  • This surface sizing serves to improve the mechanical properties, among other things to increase the rigidity.
  • the rigidity is increased in particular by the application of starch, whereby the best effect occurs, when the starch remains in the near-surface layers of the paper. There, the highest tensile and compressive stresses occur during bending. The middle of the paper web is stress-free and thus largely stress-free.
  • the starch coating results in a very low penetration of the starch into the paper.
  • the penetrated deep into the paper strength can then not develop the maximum increase in strength.
  • the invention has for its object to adapt the mechanical properties of a web with little effort to predetermined requirements.
  • This object is achieved in a method of the type mentioned above in that the web is precalendered before the application of the glue.
  • the porosity of the base paper is reduced, so that the glue applied thereafter can no longer penetrate so deeply into the paper web.
  • the glue or the solids contained therein thus remain in near-surface areas of the paper web, which is desirable.
  • the use of glue can be reduced or the strength of the web can be increased with the same amount of glue used.
  • the web is dewatered in a single press nip. If you dewater the web in just one nip, the equipment cost is small. The drainage leads to a high porosity. However, this can be eliminated by the Vorkalandrieren again so far that the glue application penetrates only in the desired areas of the web.
  • the web is calendered to a roughness in the range of 400 to 800 ml / min Bendtsen in pre-calendering.
  • the decrease in roughness in the precalender must therefore not even be excessively high.
  • the goal of precalendering is to reduce porosity.
  • the ultimately desired porosity of the surface of the web is usually produced anyway only after the dryer section, for example by calendering in a calender. Due to the relatively low reduction in roughness on the said area, it is possible to keep the effort that one must operate for Vorkalandrieren relatively small.
  • the web is calendered at a line load in the range of 10 to 40 kN / m.
  • This line load is comparatively low. It has the advantage that the web is not over-compacted during pre-calendering. The bulk thus remains at least largely preserved, which is an additional measure to adapt the mechanical properties of the web to given requirements.
  • Pre-calendering is preferably carried out using a roller whose surface temperature is in the range from 75 ° to 100 ° C.
  • a heated roll leads to an improvement in the closing or shrinking of the pores without unduly increasing the line load. So you can vorkalandr Schl volume-saving.
  • Pre-calendering rolls are preferably used without zone control.
  • precalendering it is thus possible to use, for example, a single nip or two nips connected in series, which are of comparatively simple design. Basically, it's enough to let two rollers run against each other in the nip or the nips.
  • a cross profile control as would be possible with a zone-controlled roller, is then not possible here. But this is not absolutely necessary.
  • the actual transverse profile adjustment is then carried out, for example, after passing through the dryer section.
  • a line load in the range of 600 to 1000 kN / m.
  • this line load is lower than the previously used line loads, which are usually in the range of 900 to 1250 kN / m.
  • this raw paper roughness can be accepted because the web is precalendered before the glue application.
  • the web is run at least 1200 m / min. This rate leads to intensive dewatering in the single nip of the press section, but at the same time is high enough to achieve the desired porosity reduction in pre-calendering.
  • a glue having a solids content in the range of 12 to 18%, in particular between 12 to 15% is used.
  • Increasing the solids content of the surface sizing of the web reduces the penetration rate and thus the penetration depth of the surface sizing into the web. This ensures that the reinforcement of the web and thus the increase in strength remains limited to areas near the surface of the web, that is to say where it is present where the greatest mechanical stress occurs.
  • a starchy glue is used.
  • Starch is relatively inexpensive, but allows the desired increase in mechanical stability.
  • the glue is applied oven dry with a basis weight of 1 to 2 g / m 2 .
  • This is an amount that is not overly high. Due to the limited penetration depth and the associated concentration of the glue in the near-surface regions, this amount is sufficient to produce the desired mechanical stability.
  • the specified basis weight applies per side of the web. So if a two-sided gluing is done, then a total of 2 to 4 g / m 2 are applied oven dry.
  • the web is calendered after drying with a Hartnipkalander after.
  • a hard nip calender is used to smooth the web about equally well on both sides, on the one hand, and also to adjust the thickness of the web substantially uniformly across the width of the web, on the other hand.
  • an indirect glue application is used.
  • a doctor blade is then used after the glue application.
  • This gluing concept is particularly favorable at the above-mentioned higher speeds, where deficiencies of the web strength in the transverse direction occur due to high longitudinal orientation of the fibers.
  • the object is achieved in a device of the type mentioned above in that a pre-calender is arranged in front of the glue application device.
  • a press section with a single nip or nips used for dewatering has the negative effect of having a relatively high porosity after passing through this dewatering nip.
  • This porosity can now be reduced by the Vorkalander at least so far that the glue application can not easily penetrate into deeper areas of the web, but remains in near-surface areas. This can be with otherwise constant glue application increase the strength and mechanical strength of the web.
  • the precalender is adjusted to a smoothening effect in the range of 400 to 800 ml / min Bendtsen. This relatively low smoothing effect is sufficient to achieve the desired effect in the subsequent heatnbeleimung.
  • the pre-calender preferably has a heatable roller with a surface temperature in the range of 75 ° to 100 ° C. This hot roller improves the smoothness and thus reduces the porosity.
  • none of the rollers of the precalender has a zone control.
  • the mechanical complexity of the Vorkalander can be kept very low. Basically, only two rollers are required, which together form a nip. Both rollers are preferably designed as hard rollers, so that there is also a hard nip.
  • the press has a loading device that generates a line load in the range of 600 to 1000 kN / m.
  • a line load in the range of 600 to 1000 kN / m.
  • the web passing through the press section is dewatered very intensively. Due to the low line load but the bulk is reduced only to a tolerable level.
  • the porosity of the web is increased. This increase can be accepted because the pre-calender before the glue applicator ensures that the increase in porosity is reversed and even further reduced.
  • a Hartnipkalander is arranged behind the dryer section.
  • This hard nip calender may be arranged online, i. The web is transferred from the dryer section directly into the Hartnipkalander.
  • the hard-nip calender may also be set up offline, i. The web is first wound after passing through the dryer section and then unwound before passing through the Hartnipkalanders.
  • the figure shows schematically a device 1 for treating a web 2 of pulp.
  • the device 1 is also referred to as "paper machine” for short.
  • the paper machine has a wire section 3, in which by means of a former 4, a fiber-containing suspension from a headbox 5 is applied to a rotating sieve.
  • the former 4 is preferably applied as a gap former, which can work well even at higher speeds of more than 1200 m / min.
  • This former 4 covers an RLV range (tenacity ratio) between 2.5 and 5.
  • a large part of the strength potential of the web 2 must be placed in the longitudinal direction, in particular with regard to runnability, tensile strength at high speeds, so that the transverse strengths are usually critical.
  • the former 4 may also be designed as a hybrid former, which generally leads to an improvement in the volume of wood-free papers.
  • a press section 7 which in the present case has a single press 8 with a single press nip 9.
  • This press 8 can also be designed as a Breitnipresse, in which the web 2 is pressed by means of a shoe roll against a counter-roller.
  • the in the press 8 usually additionally available tools for guiding the web and for drainage, in particular felts, are not shown here for reasons of clarity.
  • the press nip 9 can also be formed by two "normal" rollers.
  • the press 8 is characterized by a loading device 27, which is shown only schematically is, so acted upon that in the press nip 9 a line load in the range of 600 to 1000 kN / m acts.
  • the web 2 After passing through the press section 7, the web 2 is guided in a pre-drying section 10, where it is dried, for example, by contact with several drying cylinders 11.
  • the web After leaving the pre-drying section 10, the web is passed through a pre-calender 12, in which two hard rolls 13, 14 form a hard nip 15.
  • the two rollers 13, 14 have no zone control. In other words, the two rollers 13, 14 are not formed as deflection adjustment rollers.
  • the web 2 In the Vorkalander the web 2 is subjected to a line load in the order of 10 to 40 kN / m.
  • precalendering in the precalender 12 in particular, the porosity of the web 2 is to be reduced, which has formed in the individual press nip 9 by the very intensive dewatering.
  • the web 2 After passing through the precalender 12, the web 2 is passed through a glue applicator 16, in which a starch-containing glue is applied to both surfaces of the web 2.
  • the glue applicator 16 is shown here schematically with two rollers 17, 18, which are wetted on its peripheral surface with the glue and then transfer this glue on the web 2.
  • An unspecified doctor blade is present to keep the applied layer thickness constant. It However, other glue applicators are usable.
  • a "SpeedSizer” offered by Voith Paper GmbH, Heidenheim, Germany is used. This SpeedSizer is used in particular when the web 2 is passed through the device 1 at higher speeds of 1200 m / min or more.
  • glue with a relatively high solids content ie a starch content in the range of 12 to 18%, is applied to the two surfaces of the web 2.
  • the order is carried out in an amount that corresponds oven-dry per surface weight of 1 to 2 g / m 2 , ie in a state in which the web 2 has been dried by supplying heat.
  • the web 2 is dried without contact by a drying device 19, 20 and then passes through a after-dryer section 21.
  • the web After leaving the after-dryer section 21, the web passes through a hard nip calender 22 having two hard rollers 23, 24 forming a hard nip 25 therebetween. After calendering in the calender 22, the web 2 is wound up in a reel 26.
  • the hard nip calender 22 operates at a line load in the range of 10 to 50 kN / m. With the Hartnipkalander 22, the surface of the web 2 is smoothed to the desired extent.

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EP07103019A 2006-04-07 2007-02-26 Procédé et dispositif de traitement d'une bande de matière fibreuse Withdrawn EP1842961A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610016869 DE102006016869A1 (de) 2006-04-07 2006-04-07 Verfahren und Vorrichtung zum Behandeln einer Bahn aus Faserstoff

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DE (1) DE102006016869A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018261A1 (fr) * 2009-08-13 2011-02-17 Voith Patent Gmbh Procédé et dispositif pour la fabrication de papier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002103109A1 (fr) * 2001-06-18 2002-12-27 Metso Paper, Inc. Procede, machine a papier et papier de base pour la fabrication de papier impression couche leger (lwc) recouvert une seule fois
EP1382742A2 (fr) * 2002-07-18 2004-01-21 Voith Paper Patent GmbH Dispositif et Procédé pour l' imprégnation d' une bande de papier ou carton

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002103109A1 (fr) * 2001-06-18 2002-12-27 Metso Paper, Inc. Procede, machine a papier et papier de base pour la fabrication de papier impression couche leger (lwc) recouvert une seule fois
EP1382742A2 (fr) * 2002-07-18 2004-01-21 Voith Paper Patent GmbH Dispositif et Procédé pour l' imprégnation d' une bande de papier ou carton

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011018261A1 (fr) * 2009-08-13 2011-02-17 Voith Patent Gmbh Procédé et dispositif pour la fabrication de papier
CN102472012A (zh) * 2009-08-13 2012-05-23 福伊特专利公司 用于造纸的方法和设备

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