EP1766131A2 - Procede pour appliquer un produit d'enduction ainsi que procede et machine pour la fabrication d'une bande de matiere fibreuse - Google Patents

Procede pour appliquer un produit d'enduction ainsi que procede et machine pour la fabrication d'une bande de matiere fibreuse

Info

Publication number
EP1766131A2
EP1766131A2 EP05766801A EP05766801A EP1766131A2 EP 1766131 A2 EP1766131 A2 EP 1766131A2 EP 05766801 A EP05766801 A EP 05766801A EP 05766801 A EP05766801 A EP 05766801A EP 1766131 A2 EP1766131 A2 EP 1766131A2
Authority
EP
European Patent Office
Prior art keywords
fibrous web
press
medium
machine according
application
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Withdrawn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
EP05766801A
Other languages
German (de)
English (en)
Inventor
Wilhelm Gansberger
Martin Vogt
Georg Bacovsky
Joachim Henssler
Daniel Kotzmaier
Robert Kling
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
Priority claimed from DE200410033802 external-priority patent/DE102004033802A1/de
Priority claimed from DE200410048429 external-priority patent/DE102004048429A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1766131A2 publication Critical patent/EP1766131A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • D21H23/28—Addition before the dryer section, e.g. at the wet end or press section

Definitions

  • the invention relates to a method for producing a paper, board, tissue or other fibrous web having a basis weight of less than 125 g / m 2 , in particular less than 100 g / m 2 and very particularly less than 80 g / m 2 , using a device for applying a fluid application medium, in particular starch.
  • DE 100 33 213 A1 describes a method and a device for applying a liquid to pasty medium, preferably starch, onto a material web, preferably of paper or cardboard, in particular corrugated board, on one or both sides. or on both sides with an order and then passes through a press nip.
  • the method is carried out with a device in which an endless belt is guided over two support rollers, which substantially fully supports the material web, among other things even after the press nip.
  • WO 99/22067 discloses a method and a device for applying a pasty application medium to a moving material web, in which the material web is first formed in a twin-wire zone of a paper machine such that a liquid or pasty application medium is applied to the material web at least on one side by means of an application device is applied.
  • a further application device for the application of a liquid or pasty application medium to the material web is present.
  • a first application device sprays a coating medium onto the web while passing it over a suction roll by means of a felt.
  • a second application device sprays a coating medium onto the surface of a transfer belt, from which the application medium is subsequently transferred to the web. Both application devices are arranged in front of the first press nip.
  • the enrichment of a coating medium in the water cycle of the machine for producing the fibrous web leads to significant impairments in the production process, for example, slime, deposits, COD load (the COD value is a sum parameter for the organic load of a wastewater) and an odor burden.
  • this object is achieved in a method of the type mentioned above in that a liquid having a solids concentration, in particular a starch solids concentration of more than 15%, in particular more than 25% and very particularly more than 30% is used as the application medium.
  • this object is also achieved in that at least one of the felts or one of the transfer belts is conditioned by a liquid which is over a separate cycle is added and removed.
  • the water enriched with (dyed) starch is not fed to the white water, but is fed back into the starch preparation process at a suitable point. With this measure, the loss of strength is minimized.
  • the drying is carried out without contact; Preferably, only the surface of the paper or board web is dried in order to avoid deposits of the subsequent contact drying units. For this purpose, for example, a hot air drying is used.
  • the press waters are separated into unloaded and polluted waters.
  • the unloaded waters can be used according to the prior art, so for example, the white water circuit to be supplied.
  • the starch-loaded waters are preferably used so that the starch contained in these waters leads to a strength-increasing effect of the paper, or at a point in the water cycle where the problems described above can be avoided as much as possible.
  • the white water can be monitored with an online zeta potential measurement to achieve retention and process stability.
  • the amount of starch-stressed press water can be reduced by applying the starch only at the end of the press section, preferably before the last nip.
  • Potentially starch-laden water may be used to prepare the starch.
  • An overflow of starchy water can be fed to the white water circuit.
  • the starch content of the starchy water can be reduced before it is returned to the circulation.
  • the starch can be degraded enzymatically, such as by amylase in conjunction with an elevated temperature. Subsequently, the amylase can be destroyed again at temperatures of more than 110.degree. C., preferably of more than 120.degree.
  • the starch can also be separated by ultrafiltration or nanofiltration or by reverse osmosis.
  • press water consist of starch preparation, stock preparation, in the constant part of the machine, in the headbox and in the discharge.
  • the runnability of the fibrous web is improved.
  • the impurity burden is reduced by the invention.
  • the chemical efficiency of the paper machine is increased.
  • the starch-loaded press water is used specifically to increase strength.
  • the process stability by avoiding contamination of process components and water and by a lower drop in the initial wet strength of the fibrous web due to a reduced liquid application by the fleet of the application medium, in particular the starch fleet, avoided and thus optimizes the efficiency of the order of the application medium ,
  • a method proves to be advantageous in which the liquid in the processing process for the production of the application medium, in particular the starch-containing liquid, is recycled. It is advantageous if the application quantity of the application medium is between 2 and 8% of the basis weight of the finished paper or finished cardboard wound on the reel of a winding machine.
  • a low viscosity of the starch liquor is necessary. This is determined by the starch temperature and by the starch pot.
  • another advantageous method is that the temperature of the application medium after leaving the device by heating a transfer belt or felt or a roller to which the application medium is applied directly or indirectly, is increased. This makes it possible to ensure that the temperature of the carrier medium, d. H. the roller or the band corresponding to the starch fleet.
  • the application medium is applied directly or indirectly to the fibrous web immediately before a press nip, in particular before the last press nip, in the press section.
  • the application medium, in particular the starch before the last press nip, the amount of starch-laden press water can be significantly reduced.
  • a good quality of the order can be achieved when using native or uncooked starch or degraded, in particular oxidative or enzymatically degraded starch or cationic starch as a coating medium.
  • the concentration of the coating medium, especially the starch, can be chosen to be 15% or more.
  • the location for the first order is inventively arranged so that the drainage of the web is not against the order direction, but with the application direction, for example at the beginning of the dryer section or generally after the mechanical pressing. This means that, for example, on one side of the web an order takes place, while on the opposite side directly at or behind the application point water from the web, such as in the press nip, pushed out or sucked.
  • This arrangement is particularly advantageous at high speeds, such as greater than 800 m / min or greater than 1000 m / min, and at high basis weights.
  • the invention also relates in this first aspect to a machine, in particular for carrying out one of the methods described above.
  • the machine is characterized in that the press section comprises a plurality of guide rollers, over which the felts or Tra ⁇ sferb selected are guided, and that at least one device for felt conditioning in front of the first auße ⁇ patented guide roller is arranged.
  • scrapers are used to clean the lateral surfaces of the rollers on rollers of the press section, in particular on the first guide roller and / or on further guide rollers.
  • rollers it is also advantageous if at least one of the rollers, a device for spraying the lateral surface of the roller, in particular with conditioned water or with a chemical aid, in particular a surfactant, or a brush for cleaning the lateral surface is arranged.
  • the penetration of the starch is prevented; Lower water absorption results in a lower decrease in the strength of the fibrous web. Because of good penetration, the application medium has a high efficiency. The runnability of the fibrous web is improved.
  • the application medium can also directly, d. H. without a transfer tape, are applied.
  • the invention further relates to a machine for producing a paper, board, or another fibrous web having a press section having a press roller forming two press nips in conjunction with a first and a second press roll and having at least one device arranged in the press section for applying a medium, in particular starch or glue, wherein the fibrous web is feasible together with a band through the press nips.
  • the starch is applied to applicator rollers according to an embodiment.
  • press sections with central rollers are described in two embodiments (FIGS. 1 and 2) which form two press nips with press rollers.
  • a machine for producing a paper, board, or another fibrous web having a press section with at least one press nip through which the fibrous web is feasible and at least one application device through which a liquid "medium in the press section on one side of the fibrous web can be applied, wherein the medium is applied by the applicator immediately before the press nip and / or in the press nip on the fibrous web.
  • a targeted drying of the fibrous web after the application of the medium is made possible.
  • the dry content of the fibrous web after passing through the press section is higher than in the prior art. Due to the higher dry content of the fibrous web, the thermal drying energy can be reduced. This has the
  • the drying section has a shorter length and the production capacity of an existing paper machine is increased. Also a following
  • Starch aggregate can be omitted in this way; or it is sufficient to apply less starch, whereby the dry content drop after the Application unit is lower and the runnability of the fibrous web is improved.
  • the press section is designed such that the fibrous web in the press nip is only dewaterable on the side of the fibrous web, which is arranged opposite the side of the order of the medium on the fibrous web.
  • the coating direction or penetration direction of the medium into the fibrous web corresponds to the direction of drainage from the ? Fibrous web.
  • the penetration of the introduced into the fibrous web liquid medium in the fibrous web is significantly improved because the dewatering of the fibrous web on the order side opposite side flooding of the registered medium from the fibrous web is prevented, as would be the case if the fibrous web on the side of the job would be drained. Rather, the penetration of the medium is enhanced by a "suction effect", so that the medium is absorbed in the dewatering in the fibrous web.
  • a concrete embodiment for implementing the above embodiment of the invention provides that the fibrous web on the side on this is drainable, is guided in contact with a press felt through the press nip.
  • the press felt assumes the function of discharging water from the fibrous web during drainage.
  • the application side of the medium of the fibrous web in the press nip in contact with a surface which is not suitable to receive water from the fibrous web.
  • the press section has a press nip which is arranged below the press nip in the transport direction of the fibrous web and that a further application device is provided, through which a further liquid medium in the press section on the side of the fibrous web can be applied which is located opposite to the side of the first job.
  • the press section has further press nips after the press nip in the transport direction of the fibrous web and is designed such that the fibrous web can be dewatered in at least some, preferably all, of the further press nips only on the side of the fibrous web which is the side of the fibrous web Order of the medium is disposed opposite to the fibrous web.
  • Analogous to the specific embodiment provides a specific embodiment of the above-mentioned embodiment that the fibrous web on the side on which it is dewaterable, in contact with a press felt by one of the other Pressnip feasible.
  • press nip is formed by a roller and a counter roll, the counter roll is besaugbar and with the dewaterable side of the fibrous web in Contact is bringable.
  • the application device comprises a spraying device, through which the medium can be sprayed directly onto the fibrous web.
  • the medium is usually applied to the fibrous web before the press nip. It would also be possible to spray the medium in the press nip on the fibrous web.
  • the applicator device comprises a roller which together with the counter-roller forms the press nip, in which the medium is transferred from the roller to the fibrous web.
  • the medium is applied by the waltz in the press nip on the fibrous web as it passes through the press nip.
  • the application device comprises a spraying device, by means of which the medium can be transferred or sprayed onto the roller.
  • the application device comprises a functional band, by means of which the medium can be transferred to the roller.
  • the application device comprises a functional band, which by the Pressnip runs and thereby transfers the medium to the fibrous web.
  • the fibrous web comes here with the functional band on which the medium is in the press nip in contact, whereby the medium is transferred from the functional band to the fibrous web.
  • the fibrous web can be guided in contact with the functional belt in the transport direction by means of the press nip following the press nip.
  • the medium in the press nip is transferred from the functional band to the fibrous web and the fibrous web subsequently runs in contact with the functional band through the subsequent nip.
  • the press section preferably has a roller which is in contact with two counter rollers, the roller forming the press nip with one counter roller and the subsequent press nip with the other counter roller.
  • a roller which is in contact with two counter rollers, the roller forming the press nip with one counter roller and the subsequent press nip with the other counter roller.
  • the functional band is circling the roller. This is particularly advantageous if the press nip following the press nip of the medium is the last press nip of the press section. In this case, it is possible, for example, that the functional belt acts as a transfer belt between the press section and the dryer section.
  • the functional band acts as a transfer belt between the press section and the dryer section, it makes sense if the functional band is permeable to air and / or transparent to radiation but not permeable to liquids.
  • a drying device is provided that the Faserstoffbah ⁇ on both sides, ie on the resting on the Funktio ⁇ sba ⁇ d and on the free side, for example. By air and / or radiation.
  • a particularly preferred embodiment of the invention provides that in the transport direction of the fibrous web between the last press nip of the press section and the first drying cylinder of the dryer section Drying device, preferably for contactless drying, is provided.
  • the dry content after application of the medium in the press section can be further increased if the temperature in the region of the press section, in particular in the region of the press nip, is higher than 40 ° C, preferably higher than 50 ° C, and up to 80 ° C.
  • a concrete embodiment of the above-mentioned possibility of pressing at elevated temperature is that the press felt on which the fibrous web can be guided through the press nip is preheated accordingly.
  • the dry contents can be further increased if:
  • the press section comprises only roll press nips and the sum of the line forces acting on the fibrous web during the passage through the press section is 300 kN / m or more, preferably 350 kN / m or more.
  • the press section comprises a shoe press nip and that the sum of the line forces acting on the fibrous web during passage through the press section is 700kN / m or more, preferably 1000kN / m or more.
  • the press section comprises two shoe press nips and that the sum of the line forces acting on the fibrous web during the passage through the press section is 1700 kN / m or more, preferably 2000 kN / m or more.
  • the press section comprises three shoe press nips and that the sum of the line forces acting on the fibrous web during the passage through the press section is 2600 kN / m or more, preferably 3000 kN / m or more, particularly preferably 4000 kN / m.
  • Fiber web in the press section it makes sense if the fibrous web is preheated at the time of application of the medium.
  • Possibilities of preheating the fibrous web and / or one of the press felts and / or the functional band exist by means of steam, radiation, hot air preheatable.
  • the medium to be applied is a starchy liquid medium
  • the liquid medium has a starch concentration of at least 12%, preferably at least 20%, particularly preferably at least 30%.
  • the invention relates to a method for producing a fibrous web in which the fibrous web is passed through a press nip a liquid medium on one side of the fibrous web is applied immediately before the press nip and / or in the press nip on the fibrous web.
  • a preferred embodiment of the method provides that the fibrous web is dewatered in the press nip only on the side of which is arranged opposite to the side of the order of the medium on the fibrous web.
  • FIG. 1 shows a press section with two press nips formed by different press cylinder pairs and with at least one device for applying a fluid application medium
  • Fig. 3 shows a press section with a central roller and two devices for applying a fluid application medium
  • Fig. 4 shows a press section according to FIG. 3 with a single device for
  • FIG. Fig. 6 is a schematic representation of a press section with
  • FIG. 8 shows a press section with a central roller forming two press nips, in which an application to the fibrous web takes place before the press nip, while this is guided over a first press roller
  • FIG. 9 the press section according to FIG. 8, in which an application to a belt takes place, which discharges the order to the fibrous web, while this is guided over the first press roll
  • Fig. 10 the press section of FIG. 8, in which an order on the
  • FIG. 11 shows the press section according to FIG. 8, in which the order takes place on a belt which delivers the application to the central roller,
  • FIG. 12 shows a press section with a central press roll forming two press nips in connection with a part of a dryer section, wherein an application takes place on a belt looping around the central roller
  • FIG. 13 shows a press section in connection with a part of a dryer section, likewise applying an order the central roller looping around
  • Fig. 14 is a press section with two successively arranged
  • Fig. 15 shows a press section with three successively arranged shoe presses.
  • a press section 1 ( Figure 1) is formed by a tandem Nipcoflex press. From a screen belt of a twin-wire former 2, a fibrous web 3 is sucked by a pick-up roller 4 to a felt 5 and felt therefrom together with a second felt 6 through a first press nip 7, by means of further rollers 8 each equipped with a suction zone. 9 will be the Fiber web 3 first on a felt 10 and then transferred between this and another felt 11.
  • the fibrous web 3 Before the fibrous web 3 comes into the area between the two felts 10, 11, it is sprayed through a device 12 for applying the application medium, in particular a liquid containing starch.
  • the application medium is applied to the fibrous web 3.
  • the application medium is applied in a device 13 to the already preheated by a drying and / or heating device 14 felt 11. Subsequently, the felt 11 is passed through a heater 15 mounted on both sides.
  • Transfer belt 23 are Foilkksten or suction devices 27 employed.
  • the Transfer from the press section 1 to the dryer section 24 takes place in a region 28.
  • the fibrous web 2 is guided either in the sandwich (FIG. 2 b), or the felt 10 (FIG. 2 a) is removed upward immediately after the press nip 17, so that the fibrous web 3 rests on the felt 11 only on one side ,
  • a drying device 29 is preferably arranged between the press nip 17 and the roller 22 ( Figure 2a).
  • a drying device 30 is preferably mounted between the two rollers 21, 22 (FIG. 2b).
  • Another press section 31 ( Figure 3) is formed by a DuoCentri Nipcoflex press. Also in the press section 31 of a screen belt of a twin-wire former 2, a fibrous web 32 is sucked by a pick-up roller 4 to a felt 5 and passed from this together with another felt 33 to a suction press roll 34 through a first press nip 35, which forms the suction press roll 34 together with a central roll 36.
  • a second press nip 37 employed with this forming shoe press roll 38.
  • a felt 39 is guided around.
  • the fibrous web 32 is passed in sandwich through the two press nips 35, 37, wherein it rests on the central roller 36 via a transfer belt 40.
  • An application device 41 for applying an application medium is set to the transfer belt 40.
  • heating and drying devices 42, 43, 44 are present, which are on both sides of the transfer belt 40.
  • Transfer belt can be arranged.
  • a further application device 45 relative to the press suction roller 34 is present, the application medium directly to the fibrous web
  • the fibrous web 32 After the fibrous web 32 has passed through the two press nips 35, 37 and has been heated again by the drying device 44, it is transferred by means of a suction roll 46 to a felt or a transfer belt 47, with which it is passed together through a single-row dryer section 48.
  • All felts 5, 33, 39 and transfer belts 40 can be equipped on both sides with cleaning, tensioning and conditioning devices, as exemplified by means of conditioning devices 49, 50 on the felt 39. It is understood that each felt 5, 33, 39 and each transfer belt 40, a plurality of such devices may be arranged, if necessary. It is understood that devices for removing, in particular for doctoring, and for discharging the conditioning agent are provided.
  • the fibrous web 32 is felted only on one side around the central roll 36 and transferred from there by means of the suction roll 46 onto the transfer belt 47 to the dryer section 48.
  • the application device 45 is present as the sole ä 'applicator.
  • foil boxes or suction devices 51 can be set against the fibrous web 32.
  • an application medium is indirectly applied to the fibrous web 32 at a first application point by an application device 58 by spraying it onto the press roll 56.
  • the application material passes within the press nip 52 on the fibrous web 32, while on the opposite side water from fibrous web 32nd is pressed out and is absorbed by a felt 59 which is passed together with the fibrous web 32 through the press nip 52.
  • a clamping device 60 To the felt 59 are also a clamping device 60, a controller 61, in particular for adjusting the angular position of the felt 59, and at least one conditioning device 62, in particular with respect to a guide roller arranged. From the felt 59, the moisture is removed again by a vacuum cleaner 63 and / or other suction devices.
  • the fibrous web 32 is passed after passing through the press nip 52 to a drying or heating device 64 to dry the application of the application medium on the upper side of the fibrous web 32.
  • an application device 70 is arranged as a second application device for the application medium within the paper machine.
  • the application device 70 comprises an application unit 71 which applies the application material to the smooth lateral surface of a transfer roller 72. From this, the application medium reaches the side of the fibrous web 32, which is opposite to the side, was first applied to the press nip 52 application medium.
  • a cleaning device 73 is employed on the opposite side of the application unit, which cleans the surface of the transfer roller 72 of application material, which was not picked up by the fibrous web 32 in the nip between the transfer roller 72 and the guide roller 68.
  • the sprayed off by the cleaning device 73, rinsed and / or wiped or Torakelte application material is removed via a drainage channel 74.
  • This form of application to the fibrous web 32 with two successively arranged application sites is particularly suitable for speeds of more than 800 m / min.
  • a separation of the waters produced in the press section is also provided, whether they are loaded with starch or not loaded.
  • a fibrous web 75 (FIG. 6) is passed through a press nip 76 between two press rolls in a press section, press water formed there is removed via suction devices 77, 78 and a line 79.
  • the press water in the lines 79, 82 can either be merged or treated separately.
  • wastewaters to be discharged are formed in the wire section 84 and in the press section 85.
  • the press water which is subjected to a cleaning 86 in a unit 86, for example, as a dilution water the head box of the wire section 84 fed again.
  • the press water or a part of the press water can be returned to a device 87 for the preparation of starch, so that the starch already contained in the press water can be fed again to the production process.
  • a part of the treated press water is discharged from the unit 86 to stock processors 88 or to the constant portion 89 upstream of the paper machine 83 to serve as a dilution water.
  • a part of the press water which is either not needed because of the accumulating amounts of the press water or because it contains too much unwanted waste, is about a Removal unit 90 taken out of the production process and must be disposed of as wastewater.
  • a fibrous web 101 (FIG. 8), coming from a wire section 102, is guided through a press section 103. In this she will after passing through one
  • Press nip 169 which is formed by a roller 170 and a counter-roller, passed through two press nips 104, 105, of a roller 106 and the
  • the counter roll 107 is additionally equipped with a suction zone to suck the fibrous web 101 of a belt or felt 109 and to support especially the dewatering of the fibrous web 101.
  • a medium is applied to a side 151 of the fibrous web 101 in the region of the shell of the press roll 107 by a device 110.
  • the medium is either starch or glue.
  • steam is also sprayed to heat the fibrous web 101.
  • the application of the medium takes place immediately before the press nip 104.
  • the fibrous web 101 is guided through the first press nip 104 in order to firmly bond the application to it, while moisture is removed from the fibrous web 101 via a press felt 111.
  • the fibrous web 101 is dewatered in the press nip 104 only on the side 152 of the fibrous web 101, which is the side 151 of the order of the medium disposed on the fibrous web 101 opposite. Dewatering therefore takes place in such a way that the direction of dewatering of the moisture from the fibrous web 101 is equal to the direction of penetration of the medium into the fibrous web.
  • the moisture is removed via a press felt 112.
  • the dewatering of the fibrous web is also such that the fibrous web 101 is dewatered only on the side 152 of the fibrous web 101, which is the side 151 of the order of the medium disposed on the fibrous web 101 opposite. This means that also in the press nip 105, the direction of drainage of moisture from the fibrous web 101 is equal to the direction of penetration of the medium in the fibrous web.
  • the fibrous web 101 is provided with an application in front of the first press nip 104.
  • an applicator 113 comprises a spraying device 146 and a functional belt 114.
  • the spraying device 146 transfers the medium, in particular starch or glue, to the functional belt 114.
  • the functional belt 114 transfers the medium, in particular starch or glue, to the functional belt 114.
  • 114 dispenses the application in a nip 115 formed by the functional belt 114 with the counter-roller 107 to the fibrous web 101 while it wraps around the jacket of the counter-roller 107.
  • a heating device 116 in particular for non-contact heating, can be arranged on the functional belt 114.
  • a conditioning device can also be provided on the functional band 114. In both arrangements shown in FIGS. 8 and 9, the application of the medium takes place against the counter-roller 107 designed as a suction roller.
  • an applicator 147 has a spraying device 117 and the roller 106.
  • the spraying device 117 applies the medium to the outer surface of the roller 106, which forms the press nip 104 with the counter roller 107.
  • the roller 106 discharges the medium in the press nip 104 onto the side 151 of the fibrous web 101.
  • an application is indirectly applied to the roller 106 by a spray device 118 of an application device 148 applying a job to a functional belt 119 which is transferred in a nip 120 to the roller 106, so that it is passed in the press nip 104 on the side 151 of the fibrous web 101.
  • the dewatering takes place in the first press nip 104 and in the second press nip 105 such that the dewatering direction of the moisture from the fibrous web 101 is equal to the direction of penetration of the medium into the fibrous web.
  • the counter roll 108 is designed as a shoe press roll.
  • a fibrous web 122 coming from a wire section 121 is transferred via a lower felt 123 into a press section 124 with a roller 125.
  • the press section 124 has an application device 149 with which a medium is transferred to the side 151 of the fibrous web 122 in the press nip 126.
  • an application for example thickness, is applied to a functional strip 131 before the first press nip 126 via a spray device 130, which is permeable to air but not permeable to liquid.
  • the • Function strip 131 passes, together with the fibrous web and a press felt 153 of the press nip 126.
  • the medium is transferred and on the side 151 of the fibrous web 122 simultaneously drained by means of the press felt 153 opposite to the side 151 page 152, so that the dewatering direction from the fibrous web 122 is equal to the direction of penetration of the medium in the fibrous web.
  • the functional band 131 wraps around the roller 125.
  • the fibrous web 122 After passing through the press nip 126, the fibrous web 122 passes through the
  • the medium in the fibrous web is. Also by the Press nip 127, the fibrous web 122 is guided in contact with the functional band 131.
  • the press nip 127 is the last press nip of the press section 124.
  • the functional belt 131 acts as a transfer belt between the press section 124 and a dryer section 136.
  • the functional belt 131 After passing through the functional belt 131 through the press section 124, the functional belt 131 is heated together with the fibrous web 122 transported by it from both sides or at least from a single side, in particular from the upper side, by drying devices 132, 133 and dried.
  • the upper drying device 132 generates hot air
  • the lower drying device 133 is, for example, a radiation dryer.
  • a further drying device 134 may be arranged on the fibrous web 122 in the subsequent region of a drying wire.
  • both drying devices 132, 134 are radiation dryers.
  • the use of an air-permeable belt 131 has the advantage that it can be dried through it.
  • the functional band 131 is impermeable to air, it is preferable to provide a demolition automatic with an optical or thermal sensor which recognizes the presence of the fibrous web 122 on the drying device 134 so that it is interrupted by a shutdown or
  • Pivoting can be disabled so that the drying device 134 does not heat the dryer fabric and damage it.
  • a conditioning device 135 is employed.
  • a cleaning agent is applied by spraying, which is then wiped off again.
  • the Fu ⁇ Vietnamese Formsba ⁇ d 131 is applied by the device 130 applied application of the medium in the press nip 126 to the Faserstoffbah ⁇ 122 while it wraps around the roller 125 together with the fibrous web 122.
  • the fibrous web 122 is passed into a single-row drying section 136 with drying cylinders 137 and guide rollers 138 and vacuum sections 139 designed as suction rollers.
  • a negative pressure of preferably more than 5 kPa is used to allow a safe separation of the fibrous web 122 of thenzylindem 137, since just the acted upon with the medium side of the fibrous web 122 rests on the shell side of the drying cylinder 137.
  • the fibrous web 122 coming from a top wire from the wire section 121 is passed through two press nips 126, 127 formed by the roller 125 and the counter rollers 128, 129, the arrangement being compared to the embodiment according to FIG Fig. 12 illustrates inverted DuoCentri Nipcoflex press.
  • An air-impermeable belt 140 wraps around the roller 125.
  • the 124 has an application device 150, which comprises a function band 140 and a spray device 141.
  • the spray device sprays the medium
  • the functional belt 140 passes through the press nip 126 and
  • the fibrous web 122 is forwarded via an air-permeable belt 142.
  • On the belt 142 are on both sides contactless, for example, with radiant heat or hot air, working drying devices 143, 144 employed.
  • Also on the tape 140 may be a
  • drying device 145 employed for non-contact drying.
  • the embodiment according to FIG. 13 has the advantage over the embodiment variant shown in FIG. 12 that the band 142 may consist of a material which is not damaged or destroyed if no fibrous web 122 is guided over the band 142 and therefore the drying devices 143 , 144 heat the band 142.
  • FIG. 14 shows a further embodiment of the invention, with a press section 155, which has two in the transport direction of a fibrous web successively arranged shoe press units 157 and 158.
  • the fibrous web 156 is sandwiched between an upper press felt 162 and a lower press felt 163 by the shoe press unit 157.
  • the fibrous web 156 is transferred to an upper press felt 161 and guided in a sandwich therebetween and a functional band 159 through the press nip 168 formed by a shoe press roll 166 and a counter roll 167.
  • the fibrous web is dewatered only on page 152.
  • Application device 164 has a spray device 165 and the function band
  • the medium is applied to the
  • Function band 159 sprayed and transferred from the area of a roller 171 on the fibrous web 156 and then in the press nip 168 in the
  • Fiber web 156 registered.
  • the functional band 159 is impermeable to liquids, so that the fibrous web 156 in the press nip 168 is dewatered such that the direction of dewatering from the fibrous web 156 is equal to the direction of the medium's penetration into the fibrous web 156.
  • the fibrous web 156 is further transported on the functional belt 159 and transferred to a dryer section 160 at a roller 172.
  • FIG. 15 shows an embodiment of a press section with three shoe press units 175, 176 and 177 arranged behind one another in the transport direction of the fibrous web.
  • a liquid medium is applied to the side 151 of the fibrous web 156 before passing through the press nip 177 formed by the shoe press unit 176 by means of a functional band 179.
  • the fibrous web 156 is guided in a sandwich between an upper press felt 178 and the liquid-impermeable functional band 179 through the press nip 177 and in this case dewatered only on the side 152.
  • the fibrous web 156 After passing through the shoe press unit 176, the fibrous web 156 is guided onto an upper press felt 181 of the shoe press unit 177 and in sandwich between the upper press felt 181 and a liquid-impermeable belt 182 through the press nip 180 formed by the shoe press unit 177 and dewatered only on the side 152.
  • the fibrous web 156 is in this case dewatered in the press nips 180 and 177 such that the direction of dewatering from the fibrous web 156 is equal to the direction of penetration of the medium into the fibrous web 156.

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  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé pour fabriquer une bande de papier, de carton, de tissu ou d'une autre matière fibreuse (3) présentant une masse surfacique inférieure à 125 g/m<sup
EP05766801A 2004-07-12 2005-07-11 Procede pour appliquer un produit d'enduction ainsi que procede et machine pour la fabrication d'une bande de matiere fibreuse Withdrawn EP1766131A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200410033802 DE102004033802A1 (de) 2004-07-12 2004-07-12 Vermeidung des Stärkedurchschlagens
DE200410048429 DE102004048429A1 (de) 2004-10-05 2004-10-05 Maschine und Verfahren zur Herstellung einer Faserstoffbahn
PCT/EP2005/053302 WO2006005738A2 (fr) 2004-07-12 2005-07-11 Procede pour appliquer un produit d'enduction ainsi que procede et machine pour la fabrication d'une bande de matiere fibreuse

Publications (1)

Publication Number Publication Date
EP1766131A2 true EP1766131A2 (fr) 2007-03-28

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EP05766801A Withdrawn EP1766131A2 (fr) 2004-07-12 2005-07-11 Procede pour appliquer un produit d'enduction ainsi que procede et machine pour la fabrication d'une bande de matiere fibreuse

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Country Link
US (1) US20080053634A1 (fr)
EP (1) EP1766131A2 (fr)
JP (1) JP2008506048A (fr)
WO (1) WO2006005738A2 (fr)

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DE102004036276A1 (de) * 2004-07-27 2006-02-16 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Aufbringen eines Auftragmediums in einer Maschine zur Herstellung einer Faserstoffbahn
JP4841515B2 (ja) * 2007-07-26 2011-12-21 丸住製紙株式会社 片艶紙の製造方法及び片艶紙
JP5283409B2 (ja) * 2008-03-25 2013-09-04 大王製紙株式会社 段ボール用ライナーの製造方法
JP2009293138A (ja) * 2008-06-03 2009-12-17 Daio Paper Corp 段ボール用中芯原紙の製造方法
DE102008042072A1 (de) 2008-09-15 2010-03-18 Voith Patent Gmbh Verfahren zur Aufbereitung von flüssigen oder pastösen Auftragsmedien, insbesondere Stärke zum Auftrag auf eine Faserstoffbahn, insbesondere Papier- oder Kartonbahn und Auftragssystem
JP5855810B2 (ja) * 2009-12-28 2016-02-09 大王製紙株式会社 ティシュペーパー製品の製造方法
EP4261346A1 (fr) * 2022-04-14 2023-10-18 Billerud Aktiebolag (publ) Production de papier ou de carton doublure

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JPH0369690A (ja) * 1989-08-03 1991-03-26 Permachem Asia Ltd 製紙工程ピツチ付着防止方法
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US5858076A (en) * 1996-06-07 1999-01-12 Albion Kaolin Company Coating composition for paper and paper boards containing starch and smectite clay
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WO2006005738A2 (fr) 2006-01-19
JP2008506048A (ja) 2008-02-28
US20080053634A1 (en) 2008-03-06
WO2006005738A3 (fr) 2007-01-04

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