EP0957202B1 - Procédé et dispositif pour la fabrication de papier SC-A online - Google Patents

Procédé et dispositif pour la fabrication de papier SC-A online Download PDF

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Publication number
EP0957202B1
EP0957202B1 EP99100989A EP99100989A EP0957202B1 EP 0957202 B1 EP0957202 B1 EP 0957202B1 EP 99100989 A EP99100989 A EP 99100989A EP 99100989 A EP99100989 A EP 99100989A EP 0957202 B1 EP0957202 B1 EP 0957202B1
Authority
EP
European Patent Office
Prior art keywords
paper web
steam
supercalender
paper
nip
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.)
Expired - Lifetime
Application number
EP99100989A
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German (de)
English (en)
Other versions
EP0957202A2 (fr
EP0957202A3 (fr
Inventor
Stefan Winheim
Rudolf Dr. Mann
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.)
VIB Apparatebau GmbH
Original Assignee
VIB Apparatebau 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 DE19826899A external-priority patent/DE19826899B4/de
Application filed by VIB Apparatebau GmbH filed Critical VIB Apparatebau GmbH
Publication of EP0957202A2 publication Critical patent/EP0957202A2/fr
Publication of EP0957202A3 publication Critical patent/EP0957202A3/fr
Application granted granted Critical
Publication of EP0957202B1 publication Critical patent/EP0957202B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/008—Steam showers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices

Definitions

  • the invention relates to a process for producing SC-A paper with high gloss and high smoothness, the paper coming from the paper machine being fed online to a multinip soft calender called a supercalender, in which it is used to achieve the desired gloss and smoothness properties Passes through a large number of nips, and an apparatus for performing this method.
  • Gloss and smoothness are parameters of a paper web that influence not only its appearance but also its further processability. For certain applications, gloss and / or smoothness values are desirable which should be reproducible as evenly as possible.
  • the gloss and smoothness of the paper web are usually increased by the fact that the paper web, after the drying section of the paper machine, passes through a smoothing unit consisting of one or more nips, the gloss and / or smoothness of the paper web due to the pressure in the nip and the temperature the roller forming the nip is increased.
  • the gloss and smoothness of the paper web can only be influenced to a limited extent, since if the pressure in the nip is increased excessively, the paper web is compressed greatly as a whole and suffers a loss of volume. There is a risk that the paper web will lose stability. Also an increase there are limits to the roller temperature, since this procedure is very energy-intensive.
  • Supercalenders have a large number of rollers arranged one above the other and nips provided between them, through which the paper web passes. The large number of roller gaps results in a high degree of coverage and a good distribution of the satin work between pressure and temperature.
  • Supercalenders are usually provided offline, ie the paper web coming out of the paper machine is first wound up on a reel and transferred to the supercalender, which it then travels at a significantly lower speed than the paper machine speed.
  • the offline installation has the advantage that the paper web can even out before entering the supercalender, so that the supercalender does not have to work with the conditions from the paper machine which are influenced by many factors. However, the installation requirement is considerably higher.
  • a supercalender has heated steel rolls on the one hand and paper rolls or rolls covered with cotton on the other. More recently, so-called multinip soft calenders have also been used, in which rollers with polymer covers are used instead of paper rolls. These point to another elastic behavior than the paper rollers, so that you can work with smaller nip pressure.
  • machine or soft calenders that can be connected online to a paper machine and are therefore run through at paper machine speed.
  • Machine calenders have only a few nips, so that higher pressure and temperature are used and the paper web is subjected to correspondingly greater stress.
  • a major disadvantage of the soft calender is that not all types of paper can be refined in high quality.
  • SC-A paper that is highly compressed online using a soft calender.
  • the printability properties of a natural gravure paper supercalendered with 11 nips have been achieved with only four nips of a soft calender, but relatively high roller temperatures and compressive stresses in the nips are required for this.
  • EP 0 380 427 A2 discloses a smoothness controller for material that can be processed by a calender, in which a large number of adjustable nozzles direct a steam jet at a set speed onto certain areas of the material.
  • the nozzles are arranged immediately in front of the last roll of the calender and are directed against the direction of movement of the material to be steamed.
  • the excess steam is extracted.
  • DE 37 41 680 A1 describes a supercalender in which the paper web is moistened before it enters an evaporation device and is moistened by a further evaporation device even after passing through a number of nips.
  • the calender is connected online to a paper machine.
  • EP 0 341 457 A1 also discloses a method for producing smoothness and gloss on a paper web in a calender arrangement with two pairs of rollers, in which the paper web is cooled in each case before a pair of rollers of the calender arrangement passes through.
  • the object of the invention is to simplify the online production of SC-A paper and to improve the paper quality.
  • Paper is a voluminous fiber structure with different behavior in the thickness direction. To simplify matters, one could imagine three areas (layers) arranged one above the other for SC-A paper with a material weight of approx. 50 g / m 2 .
  • the paper surface here means the uppermost area of the paper, that is to say the upper third of the material web in the case of the SC-A paper mentioned. After the application of steam, the moisture tends to even out over the cross section of the material web, it being provided according to the invention that the paper web enters the first nip before the moisture of the surface (upper third of the material web) reaches a predetermined value of 12% to 25 % has dropped.
  • the moisture gradient between the paper web surface and the central area of the paper web allows the surface to be worked more strongly in order to achieve better gloss and smoothness properties in the nip, while the central area of the paper web ensures sufficient stability.
  • the nip primarily affects the surface area of the paper web, while the middle (and lower) area has a significant effect is less influenced than with conventional methods. In the middle (and lower) range there is therefore no significant change in the thickness direction.
  • the volume of the paper web remains in preserved to a greater extent, although the surface quality is significantly improved.
  • the rollers have to be heated far less and the pressure in the nip can be selected lower than before. This saves considerable energy.
  • the invention makes use of thoughts that are known from DE 43 01 023 C2 for machine calenders. There, too, it is already planned to vaporize the paper web immediately before the nip and to guide the paper web through the nip before the temperature and moisture in the paper web have equalized.
  • the online production of SC-A papers is however not possible with such machine calenders. It has now been recognized that this method, which is known for machine calenders, allows the paper web to be treated so gently that the paper web can be fed online to a supercalender without the hitherto usual strong drying, which enables online production of SC-A paper.
  • the paper web is guided through the first nip of the supercalender before the temperature increase in the middle third of the paper web caused by the steam has reached 1 / e times the temperature increase on the surface.
  • the temperature curve over the paper web can also be determined mathematically or empirically.
  • the double temperature and humidity gradients can further improve the gloss and smoothness of the paper web surface.
  • the paper web is expediently cooled to about 32 ° C. on the supercalender before steam is applied in order to increase the temperature gradient.
  • the temperature of the calender or steel roll in the first nip of the supercalender is greater than 125 ° C. and preferably approximately 150 ° C. in order to remove the high moisture on the web surface. At the same time, the temperature gradient and thus the improvement in smoothness and gloss are increased.
  • intermediate cooling is provided according to the invention, with which the web temperature is preferably reduced to approximately 30 ° C.
  • the paper web is intercooled after leaving the drying section of the paper machine before rewetting.
  • the invention also provides that the paper web in the supercalender is moistened with steam.
  • the steam moistening which essentially influences the surface of the paper web, enables a gentle treatment of the paper web and additional enhancement of the smoothness and gloss improvement in the nip.
  • the moisture of the paper web is determined behind the intermediate cooling section (s), and that the steam application during the rewetting and / or before the first nip of the supercalender is regulated as a function of the actual moisture values determined and predetermined target values becomes.
  • the gloss and / or the smoothness of the paper web is determined according to the supercalender and that the steam output is regulated as a function of the determined actual values and predetermined target values.
  • the object is achieved in a device for the online production of SC-A paper by the features of claim 12. Since a steam delivery device is provided directly in front of the first nip of the supercalender, the increase in temperature and moisture in the paper web caused by the steam is not yet compensated for when the paper web passes through the nip.
  • a second cooling section connects to the evaporation device in order to reduce the web temperature upstream of the supercalender again.
  • a measuring frame is provided behind the first intermediate cooling section and / or behind the second cooling section, with which the Moisture of the paper web is detected, the measured values determined being used to control the steaming device and / or the steam delivery device. This means that the vaporization can always be adapted to the current conditions.
  • a measuring frame is also provided behind the supercalender, with which the gloss and / or the smoothness of the paper web is detected, the measured values determined being used to control the steam delivery device in order to be able to correct undesired changes in gloss or smoothness immediately.
  • the temperature of the rollers is adjusted on the basis of the measured values determined.
  • a steam delivery device is arranged on both sides of the paper web in front of the first nip of the supercalender, so that the improvements in gloss and smoothness properties take place simultaneously on both the top and the bottom of the paper web.
  • a suction device for removing the supersaturated air is provided in particular in the previously described sandwich construction with steam delivery devices on the top and bottom of the paper web. Otherwise there is a risk of droplet formation, which would damage the paper web.
  • the steaming device which is provided after the drying section for rewetting the paper web, has, according to the invention, a steam delivery device on the inlet side, to which a heating duct connects, through which the paper web runs. This ensures that the moisture applied by the steam delivery device can be uniform over the cross section of the paper web.
  • This process is supported according to the invention in that warm, saturated air is provided in the heating duct and is sucked off again at the end of the heating duct.
  • the single figure shows schematically the structure of a device according to the invention for the online production of SC-A paper.
  • a device 1 for the online production of SC-A paper has a paper machine, of which only the last section of the dryer section is indicated in the drawing. The detailed design of the paper machine is irrelevant to the invention.
  • An intermediate cooling section 2 connects to the drying section of the paper machine and is separated from a paper web 3 is run through, which rotates in the section shown, two suction rolls 4, 4 'and two cooling rolls 5, 5', the temperature of the paper web 3 falling from 125 ° C to 32 ° C.
  • the paper web has a humidity of 3 to 7%, which is detected by a moisture measuring frame 6.
  • the paper web 3 passes through a steaming device 7, which on the inlet side has a steam delivery device 8 and an adjoining heating duct 9, which is filled with warm, saturated air.
  • a suction 23 is provided at the end of the heating duct 9.
  • the paper web 3 has a temperature of approx. 92 ° C, i.e. the temperature in the steaming device 7 was increased by approximately 60 ° C.
  • the steam of the paper web 3 was increased by the application of steam.
  • the paper web 3 passes through a second cooling section 10, which here has two cooling rollers 11, 11 'and a suction roller 12 arranged between them.
  • the temperature of the paper web 3 is cooled down again to approx. 32 ° C., the paper web 3 having a moisture of 7 to 11.5% at the end of the cooling section 10.
  • the moisture content of the paper web 3 is recorded via a measuring frame 13.
  • the paper web 3 is then fed online to a supercalender 14, which consists of a multiplicity of nips 15, through which the paper web passes one after the other.
  • a super calender is a multi-nip soft calender.
  • Each roll nip 15 is formed by a paper roll 16 designed as a polymer roll and a steel roll 17 which is heated to at least 125 ° C., preferably up to 150 ° C.
  • deflection rollers 18 are provided.
  • a steam delivery device 19 is provided, which can in particular consist of a steam blow box, as described in DE 43 01 023 C2.
  • steam delivery devices 19, 19 ′ are arranged on the top and bottom of the paper web 3.
  • a suction 20 is assigned to the steam delivery device 19, 19 ', via which supersaturated air is extracted.
  • further steam delivery devices 21 are provided in front of further nips 15 2 , 15 3 , 15 4 , 15 6 , 15 7 , 15 9 , via which the paper web 3 is rewetted in order to partially compensate for the loss of moisture in the nips 15.
  • a measuring frame 22 is provided which determines the gloss and / or the smoothness of the paper web 3.
  • a so-called double-stack supercalender can also be used, in which two groups of nips are arranged one behind the other, through which the paper web passes in succession. This reduces the height of the calender. Otherwise the device 1 remains unchanged.
  • the method according to the invention can be carried out in the same way for a double-stack calender as for the calender shown in FIG. 1.
  • the paper web 3 emerging in the usual way from the dryer section of the paper machine first passes through the intermediate cooling section 2, in which its temperature is reduced to 32 ° C.
  • the paper web 3 is moistened and heated in the subsequent vapor deposition device 7.
  • the heating channel 9 through which the paper web 3 passes ensures that the moisture is evened out over the cross section of the paper web 3.
  • the paper web 3 leaves the vapor deposition device 7 at a temperature of approximately 92 ° C., which would, however, impair the increase in gloss and smoothness in the supercalender 14, since not enough steam would condense in front of the first roll nip 15 1 .
  • the temperature of the paper web 3 in the second cooling section 10 is therefore reduced again to approximately 32 ° C., the paper web having a moisture content of approximately 7 to 11.5%.
  • the steam delivery device 19, 19 ' hot, droplet-free steam is now applied to the paper web surface immediately before the first nip 15 1 of the supercalender 14, wherein the steam temperature in the steam blowing chamber of the steam delivery device 19, 19 'is approximately in the range from 102 ° C. to 110 ° C. in order to prevent condensation of the steam.
  • the steam delivery device 19, 19 ' is brought as close as possible to the nip 15 1 , the distance being adjustable depending on the speed at which the paper web 3 passes through the nip 15.
  • the steam condenses, drastically increasing the temperature on the surface of the paper web 3.
  • the surface will be about 90 ° C hot after the condensation of the steam.
  • the condensed steam forms a moisture film, the strength of which is, for example, in the range of a thousandth of a millimeter.
  • the condensation results in an almost sudden increase in temperature of the surface of the paper web 3, but this compensates for itself within a very short time via the thickness of the paper web 3, so that the paper web 3 has a uniform temperature distribution within fractions of a second.
  • the homogenization of the moisture takes a little longer, since the moisture penetrates into the paper web 3 more slowly than the temperature.
  • the top layer in the case of SC-A paper with a fabric weight of approx. 50 g / m 2, about a third of the paper web
  • the top layer has a significantly higher relative humidity than the central region of the paper web 3.
  • the paper web 3 passes through the first nip 15 1 of the supercalender 14.
  • the temperature of the paper web 3 is not yet balanced at this time, rather the temperature increase in the middle third of the paper web caused by the steam application should not yet have reached 1 / e times the temperature increase of the surface of the paper web 3 ,
  • the paper web 3 is treated by smoothing the surface of the web 3, which still has the increased temperature and humidity, or providing it with an increased gloss.
  • the areas of the paper web 3 lying further inside are not significantly changed by the roller gap 15 1 .
  • the paper web 3 passes through the further nips 15 2 to 15 11 of the Supercalender 14, the paper web 3 being moistened before the individual nips by the steam delivery devices 21 in order to improve the increase in gloss and smoothness.
  • the steam delivery is controlled by the steam delivery devices 19, 19 'and / or 21 and, if necessary, the heating of the calender rolls 17.
  • the moisture values determined by the measuring frame 6 and 13, together with corresponding predetermined target values, are used to control the steam application in the steaming device 7 and the steam delivery device 19, 19 '.

Claims (21)

  1. Procédé de fabrication de papier SC-A à haute brillance et haut lissé, la bande de papier (3) sortant de la machine à papier étant humidifiée avec de la vapeur et conduite en continu à une super calandre (14) dans laquelle elle traverse une pluralité d'interstices entre deux rouleaux (151-1511) afin d'obtenir les qualités de brillance et de lissé souhaitées, caractérisé en ce que la bande de papier (3) après avoir quitté la partie sèche de la machine à papier est humidifiée de nouveau, subit un refroidissement intermédiaire avant d'entrer dans la super calandre (14) et est de nouveau humidifiée avec de la vapeur directement avant le premier interstice entre deux rouleaux (151) de la super calandre (14) et dirigée à travers l'interstice entre deux rouleaux (151) avant que l'humidité accrue, apparue lors de l'application de la vapeur, du tiers supérieur de la bande de papier ne soit diminuée en dessous d'une valeur prédéterminée située dans le domaine compris entre 12 % et 25 %.
  2. Procédé selon la revendication 1, caractérisé en ce que la bande de papier (3) est dirigée à travers l'interstice entre deux rouleaux (151) avant que l'augmentation de température due à l'application de la vapeur dans le tiers central de la bande de papier (3) ait atteint 1/e de l'augmentation de température à la surface.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la bande de papier est refroidie à environ 32°C avant l'application de vapeur dans la super calandre (14).
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la température du rouleau d'acier (17) dans le premier interstice entre deux rouleaux (151) de la super calandre (14) est supérieure à 125°C, s'élève de préférence à environ 150°C.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la bande de papier (3) est refroidie à une température inférieure à 50°C, de préférence d'environ 30°C, après avoir quitté la partie sèche de la machine à papier.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la bande de papier (3) subit un refroidissement intermédiaire après avoir quitté la partie sèche de la machine à papier avant l'humidification postérieure.
  7. Procédé selon la revendication 6, caractérisé en ce que l'humidification postérieure est réalisée dans un dispositif de vaporisation (7) dans lequel on applique tout d'abord de la vapeur sur la bande de papier (3) qui est ensuite dirigée à travers un canal chauffant (9) avec de l'air chaud, saturé.
  8. Procédé selon la revendication 6 ou 7, caractérisé en ce que l'air saturé est aspiré après le canal chauffant (9).
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que la bande de papier (3) est humidifiée postérieurement avec de la vapeur dans la super calandre (14).
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'humidité de la bande de papier (3) est mesurée derrière le refroidissement intermédiaire (2) et / ou la section froide (10), et en ce que l'application de la vapeur lors de l'humidification postérieure et / ou devant le premier interstice entre deux rouleaux (151) de la super calandre (14) est réglée en fonction des valeurs réelles d'humidité mesurées et de valeurs de consigne prédéterminées.
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que la brillance et / ou le lissé de la bande de papier (3) est mesuré après la super calandre (14) et l'application de la vapeur est réglée en fonction des valeurs réelles mesurées et de valeurs de consigne prédéterminées.
  12. Dispositif pour la fabrication en continu de papier SC-A avec une machine à papier ayant une partie sèche, une super calandre (14) disposée en continu derrière la partie sèche et ayant une pluralité d'interstices entre deux rouleaux (151-1511) qui sont traversés par la bande de papier (3), et avec un dispositif d'application de vapeur (19, 19') situé devant la super calandre (14), caractérisé en ce qu'une section de refroidissement intermédiaire (2) est prévue à la suite de la partie sèche de la machine à papier pour diminuer la température de la bande de papier (3), un dispositif de vaporisation (7) étant placé à la suite de la section de refroidissement intermédiaire (2) pour augmenter l'humidité de la bande de papier (3), et en ce que le dispositif d'application de vapeur (19, 19') est prévu directement devant le premier interstice entre deux rouleaux (151) de la super calandre (14).
  13. Dispositif selon la revendication 12, caractérisé en ce qu'une section de refroidissement (10) est placée à la suite du dispositif de vaporisation (7) grâce à laquelle la température de la bande de papier (3) peut être de nouveau diminuée.
  14. Dispositif selon la revendication 12 ou 13, caractérisé en ce qu'un cadre de mesure (6, 13) est prévu derrière la section de refroidissement intermédiaire (2) et / ou la section de refroidissement (10) avec lequel l'humidité de la bande de papier (3) est mesurée, les valeurs de mesures obtenues servant à commander le dispositif de vaporisation (7) et / ou le dispositif d'application de vapeur (19, 19').
  15. Dispositif selon l'une des revendications 12 à 14, caractérisé qu'un cadre de mesure (22) est prévu derrière la super calandre (14) avec lequel la brillance et / ou le lissé de la bande de papier (3) est mesuré, les valeurs de mesure obtenues servant à commander le dispositif d'application de vapeur (19, 19') et / ou la température du rouleau d'acier (17) du premier interstice entre deux rouleaux (151).
  16. Dispositif selon l'une des revendications 12 à 15, caractérisé en ce qu'un dispositif d'application de vapeur (19, 19') est disposé de chaque côté de la bande de papier (3) devant le premier interstice entre deux rouleaux (151) de la super calandre (14).
  17. Dispositif selon l'une des revendications 12 à 16, caractérisé en ce que le dispositif d'application de vapeur (19, 19') est muni d'une aspiration (20) pour éliminer l'air saturé.
  18. Dispositif selon l'une des revendications 12 à 17, caractérisé en ce que des dispositifs d'application de vapeur supplémentaires (21) sont prévus dans la super calandre (14) devant d'autres interstices entre deux rouleaux (152, 153, 154, 156, 157, 159) pour humidifier de nouveau la bande de papier (3).
  19. Dispositif selon l'une des revendications 12 à 18, caractérisé en ce que le dispositif de vaporisation (7) est muni du côté de l'entrée d'une installation d'application de vapeur (8) à laquelle fait suite un canal chauffant (9) qui est traversé par la bande de papier (3).
  20. Dispositif selon la revendication 19, caractérisé en ce que de l'air chaud, saturé est prévu dans le canal chauffant (9).
  21. Dispositif selon la revendication 19 ou 20, caractérisé par une aspiration (23) à l'extrémité du canal chauffant (9).
EP99100989A 1998-05-08 1999-01-21 Procédé et dispositif pour la fabrication de papier SC-A online Expired - Lifetime EP0957202B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19820606 1998-05-08
DE19820606 1998-05-08
DE19826899A DE19826899B4 (de) 1998-05-08 1998-06-17 Verfahren und Vorrichtung zur Online-Kalandrierung von SC-A-Papier
DE19826899 1998-06-17

Publications (3)

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EP0957202A2 EP0957202A2 (fr) 1999-11-17
EP0957202A3 EP0957202A3 (fr) 1999-12-22
EP0957202B1 true EP0957202B1 (fr) 2004-03-31

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DE102017106047A1 (de) 2017-03-21 2018-03-01 Voith Patent Gmbh Bahnbehandlung
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CN108914678A (zh) * 2018-07-10 2018-11-30 温州新意特种纸业有限公司 一种超级压光机
DE102021113813A1 (de) 2021-05-28 2022-12-01 Voith Patent Gmbh Verfahren und Vorrichtung

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EP0341457A2 (fr) * 1988-05-06 1989-11-15 Eduard Küsters Maschinenfabrik GmbH & Co. KG Procédé pour produire une bande de papier lisse et brillant, et calandre pour l'application du procédé

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FRANZ KAYSER: "REDEEMING OLD CALENDERS WITH NEW JANUS TECHNOLOGY", PAPER ASIA, vol. OCT.97, pages 18,20,21 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1199404B2 (fr) † 2000-10-20 2011-12-14 Voith Patent GmbH Procédé et dispositif de calandrage d'une bande

Also Published As

Publication number Publication date
EP0957202A2 (fr) 1999-11-17
EP0957202A3 (fr) 1999-12-22

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