EP0609544B1 - Procédé et dispositif pour améliorer la brillance et/ou le lissé d'une bande - Google Patents

Procédé et dispositif pour améliorer la brillance et/ou le lissé d'une bande Download PDF

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Publication number
EP0609544B1
EP0609544B1 EP93120500A EP93120500A EP0609544B1 EP 0609544 B1 EP0609544 B1 EP 0609544B1 EP 93120500 A EP93120500 A EP 93120500A EP 93120500 A EP93120500 A EP 93120500A EP 0609544 B1 EP0609544 B1 EP 0609544B1
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EP
European Patent Office
Prior art keywords
steam
web
roll gap
temperature
smoothness
Prior art date
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Expired - Lifetime
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EP93120500A
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German (de)
English (en)
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EP0609544B2 (fr
EP0609544A1 (fr
Inventor
Stefan H. Winheim
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VIB Apparatebau GmbH
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VIB Apparatebau GmbH
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    • 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
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices

Definitions

  • the invention relates to a method for increasing the gloss and / or smoothness of a material web, in particular a paper web, in which a material web moistened with the aid of steam is guided through a nip and pressurized there, the steam being condensed on the material web, and a device for increasing the gloss and / or smoothness of a material web with a pair of rollers forming a nip and a steam delivery device arranged in the direction of travel of the web in front of the nip, the steam blowing chamber which is completely enclosed by a free housing wall with a number of steam outlet openings and further chamber walls , and has a steam valve for admitting steam into the steam-blowing chamber, at least one wall of the steam-blowing chamber, in particular the free housing wall, being heated.
  • Gloss and smoothness are characteristics of a material web that influence not only its appearance but also its further processability. For certain applications, high gloss and or smoothness values are desired, which should also be reproducible as evenly as possible.
  • WO-A-90/12920 shows a steam application device which applies superheated steam to a paper web in front of a nip.
  • a heater is provided to keep the steam overheated.
  • the device touches the paper web or is arranged at a very small distance from the paper web in order to direct the hotest possible steam onto the paper web. The paper web should then be passed through a nip before it has cooled.
  • EP-A-0 296 044 describes an apparatus for controlling gloss in the cross machine direction with two steam blow boxes, which are each arranged adjacent to the side of the paper web which is to be provided with increased gloss in a subsequent nip.
  • a gloss sensor is arranged behind the last nip, which is connected to a control for the steam blow boxes. These can be controlled zone by zone in the transverse direction.
  • the object of the invention is therefore to simplify the increase in gloss and / or smoothness.
  • This object is achieved in a method of the type mentioned at the outset in that the material web is guided through the nip before the increase in moisture on the surface caused by the steam application has dropped below a predetermined value and the temperature increase is compensated for over the cross section of the material web.
  • the web more precisely its surface, has already been treated in the nip.
  • the steam is thus only applied immediately before the material web enters the nip.
  • the surface of the web is still at a relatively high temperature and has a relatively high humidity, so that the increase in gloss and / or smoothness is carried out even at low pressures and low temperatures in the nip.
  • the web does not absorb any appreciable amount of moisture, so that expensive post-treatments are not necessary.
  • the one for forming The energy required for the surface is kept in the area that is to be reshaped, i.e. smoothed. The remaining parts of the track are not affected or only to a small extent.
  • the predetermined value is preferably in the range from 12% to 25%, in particular in the range from 16% to 25%. So a relatively large amount of moisture is added to the surface. However, since this supply is limited to the surface and a thin layer underneath, the deformation does not result in any noteworthy loss of volume and also does not result in a large general increase in moisture in the web.
  • the material web is guided into the nip before the temperature in the middle third of the thickness of the web has reached 1 / e times the surface temperature. This allows a sufficient distance between the steam applied to the web and the nip, which for design reasons cannot be reduced to zero.
  • the difference between the middle and the outer third of the web is still so great in terms of temperature that the deformation is limited to the outer third, insofar as the temperature has an influence here.
  • the influence of moisture is limited to even thinner surface areas because the temperature penetrates faster than the moisture.
  • the steam is advantageously kept free of water drops until it hits the material web.
  • care is taken to ensure that the steam itself does not contain any water drops.
  • water droplets are not allowed to form in the steam. This can be achieved, for example, by heating the steam to the end immediately before it hits the material web. To this This ensures that the entire heat contained in the steam can be transferred to the surface of the material web in the condensation in order to lead to the desired temperature increase which is associated with the increase in moisture on the surface. Before the steam hits the web, there is no fog, so that the ambient atmosphere is not so strongly enriched with moisture.
  • the steam is first distributed in a distribution space to an outlet surface having a predetermined extent in the running direction of the material web and then moved at a high speed in a predetermined range in the direction of the material web.
  • the amount of steam that is condensed on the material web can be controlled via the speed. Among other things, this speed also depends on the speed of the material web. It is generally 15 m / s or more. Because the steam is first distributed in a distribution space, there is the advantage that the loading of the material web can take place relatively evenly across the width. The speed of the steam can be controlled via the pressure in the distribution room.
  • gloss and / or smoothness and / or a corresponding parameter of the material web behind the roller gap is determined and the steam output is set as a function of a difference between the determined actual value and a predetermined target value.
  • the gloss and / or smoothness is thus generated in a closed control loop, in which the steam emission is used as an actuator. If necessary, additional heating of one or both of the rolls forming the nip can also take place.
  • Steam is preferably applied in the cross-web direction in several zones, with the steam delivery being adjustable separately in each zone. This means that differences in gloss and smoothness are not only possible in the longitudinal direction, i.e. in the running direction of the material web, but also in the transverse direction of the web, if this should be necessary.
  • An equalization in the longitudinal direction is then z. B. caused by controlling the total amount of vapor dispensed.
  • the control in the transverse direction is effected by the zone-wise setting of the steam delivery quantity.
  • the supply of steam is essentially limited to an amount per time that can condense on the material web.
  • the steam supplied is therefore essentially completely consumed, so that practically no steam can escape and can lead to an increase in the moisture in the ambient atmosphere.
  • the temperature of at least one of the rollers forming the nip is additionally set for fine adjustment of gloss and / or smoothness.
  • the desired gloss and / or smoothness values can be set with high accuracy by combining the steam application, which is also associated with a temperature increase of the web, with a temperature control of the roller.
  • the surface of the roller is heated. If the heating is limited to the surface of the roller, relatively fast reaction times can be achieved. In addition, the energy consumption is kept low.
  • the temperature setting is advantageously carried out in a control loop which is subordinate to a control loop which controls the steam delivery.
  • the temperature control loop is therefore underlaid with the steam delivery control loop.
  • the steam delivery control loop has the higher priority, so that the coarse adjustment can be carried out much faster than the fine adjustment.
  • the object is achieved in a device of the type mentioned in that the steam delivery device is arranged so close to the nip that the increase in temperature and moisture due to steam is not compensated for when the material web passes through the nip.
  • Such a steam blow box itself is known from the unpublished German patent application P 41 25 062.
  • the use of such a steam delivery device in connection with the increase in gloss and smoothness of the material web has the advantage that it is possible to apply a practically water-drop-free steam to the material web. Any condensation of the steam in the steam blowing chamber is avoided because the steam blowing chamber is heated. A state is thus maintained in the interior of the steam blowing chamber in which the steam can only be present in the gaseous state.
  • the heating of the steam-blowing chamber also has the advantage that restarting the device after interruptions in operation, as can occur, for example, when changing the rollers, is made easier.
  • the free housing wall and the material web advantageously enclose an evaporation chamber, which is largely closed off laterally by housing parts of the steam delivery device. This ensures on the one hand that the steam emitted from the steam delivery device cannot escape freely into the environment. Rather, it remains in the vaporization room, where it can be removed from the material web.
  • the vaporization chamber is also also heated, particularly when the free housing wall is heated, so that the steam is kept at the necessary temperature until the very end. The steam can thus cause the necessary temperature increase of the surface of the material web during the condensation on the material web.
  • a steam-operated heating device is advantageously provided for heating, the steam valve and the heating device being connected to the same supply connection.
  • the heating device therefore works at a temperature which essentially corresponds to the steam temperature.
  • the steam blowing chamber and also the steaming chamber are thus kept at a temperature which corresponds to the temperature of the steam to be fed onto the material web.
  • adapted heating is achieved with relatively simple means.
  • the steam to be dispensed always finds an environment that essentially corresponds to its temperature. This avoids possible negative phenomena that could occur due to temperature changes to which the steam is exposed.
  • the heating device and the steam valve are preferably arranged in series.
  • the steam therefore first heats the steam blowing chamber with the aid of the heating device before it enters the steam blowing chamber which it has itself heated.
  • the heating device is therefore always at a somewhat higher temperature than the steam entering the steam-blowing chamber. It is thus able to transfer energy back to the steam in order to reliably prevent the formation of water droplets in the steam blowing chamber.
  • this measure also allows the temperature of the steam to be lowered to such an extent that the steam can condense on the material web to the desired extent. If the steam is too hot, there is also heat transfer from the steam to the surface of the material web. However, the heat transfer is considerably better if the steam can condense on the surface of the material web. In this case, the desired moisture level is also simultaneously set on the surface.
  • the heating device has a steam drying section.
  • the drying section water droplets that can possibly form during the transport of the steam from a steam generating device to the steam delivery device are reliably eliminated. So only dry steam is supplied to the steam valve, so that the risk of damage to the material web passing by is not only reduced, but practically eliminated by water droplets hitting it.
  • a front wall of the steam delivery device adjacent to a roller is inclined with respect to the free housing wall.
  • the entire steam delivery device is thus designed in a wedge shape at least in this area.
  • the steam delivery device can thus be brought very close to the nip, so that steam is applied immediately before the nip.
  • neither temperature nor moisture have had any practical opportunity to spread into the interior of the material web. Since only the surface or a thin layer below the surface has an elevated temperature and an increased moisture level, only this area is treated in the nip, ie smoothed or provided with a higher gloss.
  • the angle of inclination is advantageously between 35 ° and 55 °. On the one hand, this angular range allows the steam delivery device to bring the steam up to a very short distance in front of the nip. On the other hand, however, it allows a sufficient height that a steam blow chamber can be formed with a sufficient height for the steam to spread.
  • the steam-blowing chamber is advantageously divided transversely to the running direction of the material web into zones which have steam valves which can be controlled separately from one another.
  • the amount of steam that is applied to the material web can thus be controlled at least in sections transversely to the running direction of the material web. It is thus possible to influence gloss and / or smoothness at least in zones, even across the material web. A higher uniformity across the material web can be achieved here.
  • a gloss or smoothness measuring device is provided in the running direction of the material web behind the nip, which is connected to a control device which in turn controls the steam valves depending on the desired gloss or smoothness values.
  • the steam is applied in one closed loop. If the actual gloss or smoothness values drop below a specified target value, the steam valve of the corresponding zone is actuated in order to bring the values back to their specifications. If the actual value rises above the setpoint, the steam valve is influenced in the other direction.
  • the steam valves advantageously have outlet openings which are arranged at an angle to the free housing wall in such a way that no steam jet is directed directly onto the free housing wall. This achieves a relatively uniform spread of the steam that passes through the free housing wall. Partial increases in steam speed, as would result if a steam jet emerged from the valve directly through an outlet opening, are reliably avoided.
  • each steam jet emerging from the steam valves is directed at a chamber wall at an angle other than 90 °. It can also not happen that a steam jet is reflected in itself, which could lead to turbulence that no longer guarantee a uniform steam spreading from the outlet openings.
  • U-shaped profiles are attached to the free housing wall in the vaporization space between the steam outlet openings, the openings of which are covered by the free housing wall and form the channels as part of the heating device. These channels therefore run in the vapor deposition room. You are not only heating the free housing wall and the steam blowing chamber via this. They also heat the steaming room so that an environment is maintained until the end in which the steam retains its gaseous form. The condensation the steam actually only takes place directly on the material web.
  • the steam preferably has a temperature in the range from 102 ° C. to 110 ° C. Such a steam temperature ensures that the steam can fully condense on the material web and can bring about the desired increase in temperature and moisture on the surface.
  • the distance of the steam delivery device from the nip can advantageously be changed. With this measure it is possible, among other things, to control how deep the temperature and the moisture can penetrate into the material web before the material web enters the nip. In this way, too, a change in gloss and smoothness can be brought about, which can optionally also be included in the control loop.
  • a steam delivery device is preferably arranged on both sides of the material web in front of the nip. Steam is applied to the material web from both sides at the same time. This is particularly advantageous in the case of single calenders, in which only a single roll nip is provided.
  • a device 1 for increasing the smoothness and / or gloss of a material web has two rollers 2, 3, which form a nip 4 through which the material web 5 is guided.
  • this device 1 one side of the material web 5, here the top, is smoothed and / or provided with gloss.
  • a corresponding device 1 ' is provided for the underside of the material web 5.
  • the corresponding parts have the same reference numerals, which are deleted to distinguish them.
  • the device 1 'for the underside of the material web 5 is only discussed if there are deviations from the device 1.
  • One of the two rollers can be designed as a soft roller.
  • the rollers 2, 3 can form a so-called machine calender.
  • One or both rollers 2, 3 can be heated by a heating device 40. The heating can also be done from the inside.
  • a paper web is considered below as a material web.
  • other cellulose or cellulose-containing materials can also be used.
  • the paper web is unwound from a supply roll 6 and, after passing through the device 1, wound up on a take-up roll (not shown in more detail).
  • the paper web 5 can also be removed directly from a paper machine.
  • a steam delivery device 7 In front of the nip 4, a steam delivery device 7 is arranged, which is displaceable on a stand 8. It can be closer in or against the paper running direction 9 brought up to the nip 4 or further away from it.
  • the steam delivery device which will be described in connection with FIGS. 2 to 4, releases steam in the direction of the material web, which condenses there.
  • a measuring device 10 for determining actual gloss or smoothness values is provided in the paper running direction 9 behind the nip 4.
  • This measuring device 10 can extend over the entire width of the paper web 5. However, it is equally possible that it moves across the paper web 5 during the paper run and continuously determines gloss and / or smoothness over the entire paper web, if not simultaneously.
  • the measuring device 10 is expediently arranged behind the nip 4 'for the second material web side.
  • the measuring device 10 is connected to a controller 11, which in turn controls the steam dispensing device 7, specifically as a function of a difference between the measured values determined by the measuring device 10 and further setpoints supplied via a setpoint input 12.
  • the controller 11 can also control the device 40. Separate controllers 11, 11 'are shown for the top and bottom. It is obvious that these controllers can also be combined.
  • the steam delivery device 7 for the top of the paper web 5 is above, the steam delivery device 7 'for the bottom of the paper web is arranged below the paper web 5, so that the paper web 5 is loaded with steam from both surfaces at different times and locations.
  • each delivery device 7, 7 ' is a roll nip 4, 4'. If only one side of the paper web 5 to be treated, only one steam delivery device 7 or 7 'is provided. Therefore, only one steam delivery device 7 is described in more detail below. The other steam delivery device 7 'speaks it in mirror image.
  • the steam delivery device 7 has a steam blowing chamber 13 which is delimited by a free housing wall 14 and further housing walls 15, 16, 17, 18, 19.
  • the free housing wall 14 has steam outlet openings 20 that have a diameter that is smaller than the thickness of the free housing wall. These openings 20 are therefore only shown as a line.
  • Each steam blowing chamber also has a steam valve 21.
  • the steam valve allows steam, which it receives via a supply channel 22, to enter the steam blowing chamber 13.
  • valve openings 23 are directed so that all steam jets 24 emerging from the steam valve are directed neither directly onto the free housing wall 14 nor at an angle of 90 ° to another housing wall. This avoids that steam jets 24 emerging from the steam valve 21 can pass directly through openings 20 in the free housing wall 14.
  • reflection of the steam jets on the other housing walls, which could lead to undesired turbulence of the steam in the steam blowing chamber 13, is also avoided.
  • the free housing wall 14 encloses an evaporation chamber 29 with the paper web 5 and further housing parts 25, 26, 27, 28. Of course there is a small gap between the paper web 5 and the further housing parts 25-28. The paper web 5 should not rub against the housing parts.
  • essentially U-shaped sheets 30 are applied to the free housing wall 14, whose opening is covered by the free housing wall 14.
  • the sheets 30 together with the free housing wall 14 form heating channels 31. If steam is passed through the heating channels 31, the free housing wall 14 and thus the steam blowing chamber 13 are heated. In addition, the steaming chamber 29 is also heated.
  • the outlet openings 20 in the free housing wall are arranged between the sheets 30.
  • the housing wall 15 is heated by the feed channel 22, in which there is also hot steam.
  • the housing wall 17 is heated by a steam channel 32.
  • This steam channel 32 is designed as a steam drying section. It is connected to a steam connection 33, via which steam is supplied from a steam generating device, not shown.
  • Side channels 34, 35 are provided on the two end faces of the steam delivery device, so that the steam delivery device 7 is also heated on its two end faces.
  • One side channel 35 has at its end, i.e. shortly before the mouth into the feed channel 22, a throttle 36. This throttle causes a pressure difference between the left side channel 35 and the right side channel 35.
  • Steam which is supplied via the steam connection 33, flows, as indicated by arrows, first through the steam channel 32, where it is dried, ie water droplets which may still be present in the steam are excreted here and can be removed via a condensate drain 37.
  • the steam then continues to flow through the right side channel 35 and due to the pressure difference generated by the throttle 36 between the left side channel 34 and the right side channel 35 through the channels 31 to the left side channel 34.
  • Another portion of the steam flows into the feed channel 32, from where it reaches the steam valves 21.
  • the steam blowing chamber 13 is not heated from all sides, but from many sides. A temperature in which the steam cannot condense can therefore be maintained in the steam blowing chamber 13 without difficulty even after business interruptions.
  • each steam blowing chamber 13 has its own steam valve 21.
  • Each steam valve 21 can be controlled separately by the controller 11. Gloss and / or smoothness can thus be set separately from one another in four areas transversely to the paper running direction 9.
  • the steam delivery device 7 has the shape of a wedge in cross section, ie the wall 15 or its corresponding outer wall 39 is beveled with respect to the free housing wall 14. It has an angle in the range between 35 ° and 55 °, in the present case it is approximately 45 °.
  • the steam can be applied to the paper web 5 only relatively late before the nip, so that although it condenses there, the temperature and humidity increase in the paper web 5 due to the condensation has not yet penetrated into the interior of the paper web and has become one Compensation has resulted when the paper web 5 is exposed to the pressure in the nip 4.
  • the device works as follows: The steam delivery device 7 is brought as close as possible to the nip 4, the distance being adjustable depending on the speed at which the paper web 5 passes through the nip 4.
  • the dispenser 7 is now heated with the help of steam. If it is so hot that there is a temperature in the steam blowing chamber 13 which prevents the steam from condensing, that is to say a temperature in the range from 102 ° C. to 110 ° C., the operation can begin.
  • the paper web 5 is moved through the nip.
  • steam is supplied to the steam delivery device 7 via the steam connection 33.
  • the steam valves 21 open and allow steam to enter the steam blowing chamber 13, where it spreads and then flows through the openings 20 into the steaming chamber 29 at a relatively uniform pressure and above all at a uniform high speed of 15 m / s or more the paper web 5 to come into contact.
  • the steam valves 21 open and allow steam to enter the steam blowing chamber 13, where it spreads and then flows through the openings 20 into the steaming chamber 29 at a relatively uniform pressure and above all at a uniform high speed of 15 m / s or more the paper web 5 to come into contact.
  • the steam condenses, drastically increasing the temperature at the surface of the paper web 5. This state is shown on the right side of FIG. 5.
  • the surface will be approximately 90 ° C. hot after the condensation of the steam.
  • the condensed steam forms a moisture film 41, the strength of which is preferably in the region of a thousandth of a millimeter.
  • the condensation results in an almost sudden increase in temperature of the surface of the paper web 5, but this compensates for itself within a very short time via the thickness of the paper web 5, ie the paper web has a uniform temperature distribution in a few hundredths of a second. It takes a little longer to equalize the moisture.
  • the moisture 42 penetrates the paper web 5 more slowly than the temperature. Therefore has a surface area 43 of the paper web 5 a significantly higher relative humidity. The further the moisture penetrates into the interior 44 of the paper web 5, the more the relative humidity decreases.
  • the treatment takes place in the nip 4.
  • the web is at a relatively low pressure and low temperature in relation to the known solutions treated, namely the surface of the web, which still has the increased temperature and fencing, is smoothed or provided with increased gloss.
  • the areas 44 of the paper web 5 lying further inside are not significantly changed by the roller gap.
  • the controller 11 If the controller 11 now determines that the actual gloss or smoothness values determined by the measuring device 10 do not correspond to the target values 12, it actuates the steam valves 21 until the difference between the actual values and the target values has dropped below a predetermined value. This can be carried out in zones, so that different gloss or smoothness values can be compensated for across the width of the paper web 5. At the same time, the controller 11 can control the temperature of the roll surface with the aid of the heating device 40 in an underlying or subordinate control loop in order to achieve a fine adjustment of the gloss and / or smoothness values.
  • the distance of the steam delivery device 7 from the nip 4 can also be changed, as is shown by dash-dotted lines in FIG. 1. This adjustment will usually be done manually. If necessary, however, the regulator 11 can also make this rough setting.
  • FIG. 6 shows a second embodiment of a device 1 ', in which there is only one roll nip 4.
  • the rollers 2, 3 form a single smoothing unit.
  • the formation of the rollers 2, 3 as hard or soft rollers is determined by the circumstances.
  • a steam delivery device 7 or 7 ' is provided on both sides of the paper web in front of the nip. The steam is thus applied simultaneously on both sides of the paper web 5.
  • the gloss and / or smoothness values are determined by the two measuring devices 10, 10 'on both sides of the paper web 5 and passed on to the controller 11, which now has both steam delivery devices 7, 7'. controls.
  • rollers 2, 3 were not heated here. However, as shown in FIG. 1, it can still be provided.
  • a paper web 5 was used.
  • the method and the device are also suitable for other material webs which have cellulose fibers, for example cardboard or cardboard.
  • both a gloss and / or smoothness control of the material web in the machine direction i.e. in the running direction of the material web 5, as well as a control of these values in the transverse direction.
  • the control in the longitudinal direction can take place by controlling the amount of steam supplied to the steam delivery devices 7, 7 '.
  • the control in the transverse direction is carried out by zone-by-zone control of the amount of steam released, that is to say by setting the ratio of the amount of steam released in the individual zones.

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Claims (26)

  1. Procédé pour accroître la brillance et/ou le lissé d'une bande de matériau, notamment d'une bande de papier, dans lequel une bande de matériau humidifiée à l'aide de vapeur est guidée à travers un interstice entre cylindres, dans lequel elle est sollicitée par une pression, la vapeur étant condensée sur la bande de matériau, caractérisé par le fait que la bande de matériau est guidée à travers l'interstice entre cylindres avant que l'augmentation d'humidité de la surface, résultant de la sollicitation par vapeur, ait chuté en deçà d'une valeur prédéterminée, et que l'accroissement de température soit compensé sur la section transversale de la bande de matériau.
  2. Procédé selon la revendication 1, caractérisé par le fait que la valeur prédéterminée se situe dans la plage de 12 % à 25 %, notamment dans la plage de 16 % à 25 %.
  3. Procédé selon la revendication 2, caractérisé par le fait que la bande de matériau est guidée dans l'interstice entre cylindres avant que la température ait atteint, dans le tiers moyen de l'épaisseur de la bande, 1/e fois la température de la surface.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que la vapeur est maintenue exempte de gouttes d'eau jusqu'à la rencontre avec la bande de matériau.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé par le fait que la vapeur est tout d'abord répartie, dans une chambre de répartition, sur une surface de sortie présentant une étendue prédéterminée dans le sens du défilement de la bande de matériau, puis est mise en mouvement avec une vitesse élevée, dans une plage prédéterminée, en direction de la bande de matériau.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé par le fait que la brillance et/ou le lissé et/ou des paramètres correspondants de la bande de matériau sont déterminés derrière l'interstice entre cylindres, et la délivrance de vapeur est réglée en fonction d'une différence entre la valeur réelle déterminée et une valeur de consigne préétablie.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé par le fait que la sollicitation par vapeur s'opère en plusieurs zones dans la direction transversale de la bande, la délivrance de vapeur étant réglable séparément dans chaque zone.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé par le fait que l'amenée de la vapeur est pour l'essentiel limitée à une quantité, par unité de temps, pouvant se condenser sur la bande de matériau.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé par le fait que, en vue du réglage fin de la brillance et/ou du lissé, l'on règle additionnellement la température d'au moins l'un des cylindres formant l'interstice entre cylindres.
  10. Procédé selon la revendication 9, caractérisé par le fait que le cylindre est chauffé à sa surface.
  11. Procédé selon l'une des revendications 6 à 9, caractérisé par le fait que le réglage de température a lieu dans un circuit de régulation subordonné à un circuit de régulation commandant la délivrance de vapeur.
  12. Dispositif pour accroître la brillance et/ou le lissé d'une bande de matériau, comprenant une paire de cylindres (2, 3) formant un interstice (4) entre cylindres, et un appareil (1) de délivrance de vapeur qui est placé avant l'interstice entre cylindres dans le sens du défilement de la bande, et présente une chambre (13) de projection de vapeur, intégralement ceinturée par une paroi libre de carter (14) munie d'un certain nombre d'orifices (20) de sortie de vapeur, et par d'autres parois (15-19), ainsi qu'une soupape à vapeur (21) pour admettre de la vapeur dans ladite chambre (13) de projection de vapeur, au moins une paroi (14, 15, 17) de la chambre (13) de projection de vapeur, notamment la paroi libre de carter (14), étant chauffée, caractérisé par le fait que l'appareil (7) de délivrance de vapeur occupe, devant l'interstice (4) entre cylindres, une position suffisamment rapprochée pour que l'accroissement de température et d'humidité de la bande de matériau (5), conditionné par une sollicitation par vapeur, ne soit pas encore compensé lorsque ladite bande de matériau (5) franchit l'interstice entre cylindres.
  13. Dispositif selon la revendication 12, caractérisé par le fait que la paroi libre de carter (14) et la bande de matériau (5) ceinturent une chambre de vaporisation (29) amplement obturée, dans le sens latéral, par des parties (25-28) du carter de l'appareil (7) de délivrance de vapeur.
  14. Dispositif selon la revendication 12 ou 13, caractérisé par le fait qu'un appareil de chauffage (22, 31, 32) actionné par vapeur est prévu pour le chauffage, la soupape à vapeur (21) et l'appareil de chauffage étant reliés au même raccord (33) d'amenée de vapeur.
  15. Dispositif selon la revendication 14, caractérisé par le fait que l'appareil de chauffage (22, 31, 32) et la soupape à vapeur (21) sont agencés en ligne.
  16. Dispositif selon la revendication 15, caractérisé par le fait que l'appareil de chauffage (22, 31, 32) présente un tronçon (32) de séchage de vapeur.
  17. Dispositif selon l'une des revendications 12 à 16, caractérisé par le fait qu'une paroi antérieure (39) de l'appareil (7) de délivrance de vapeur, voisine d'un cylindre (2), est inclinée par rapport à la paroi libre de carter (14).
  18. Dispositif selon la revendication 17, caractérisé par le fait que l'angle d'inclinaison mesure entre 35° et 55°.
  19. Dispositif selon l'une des revendications 12 à 18, caractérisé par le fait que la chambre (13) de projection de vapeur est scindée, transversalement par rapport au sens de défilement (9) de la bande de matériau (5), en des zones (figures 3 et 4) comportant des soupapes à vapeur (21) pouvant être commandées séparément les unes des autres.
  20. Dispositif selon la revendication 19, caractérisé par le fait qu'un appareil (10) mesureur de brillance ou de lissé, prévu derrière l'interstice (4) entre cylindres dans le sens de défilement (9) de la bande de matériau (5), est relié à un appareil de régulation (11) commandant, à son tour, les soupapes à vapeur (21) en fonction de valeurs de consigne respectivement affectées à la brillance ou au lissé.
  21. Dispositif selon l'une des revendications 12 à 20, caractérisé par le fait que les soupapes à vapeur (21) présentent des orifices de sortie (23) décrivant, avec la paroi libre de carter (14), un angle tel qu'aucun jet de vapeur (24) ne soit directement orienté vers ladite paroi libre de carter (14).
  22. Dispositif selon la revendication 21, caractérisé par le fait que chaque jet de vapeur (24), sortant des soupapes à vapeur (21), est dirigé vers une paroi (15-19) de la chambre selon un angle différant de 90°.
  23. Dispositif selon l'une des revendications 13 à 22, caractérisé par le fait que des profilés (30) en U sont installés sur la paroi libre de carter (14) dans la chambre de vaporisation (29), entre les orifices (20) de sortie de vapeur, les ouvertures desdits profilés étant recouvertes par la paroi libre de carter (14), et formant les canaux (31) représentant une partie de l'appareil de chauffage.
  24. Dispositif selon l'une des revendications 12 à 23, caractérisé par le fait que la vapeur présente une température située dans la plage de 102°C à 110°C.
  25. Dispositif selon l'une des revendications 12 à 24, caractérisé par le fait que l'éloignement peut être modifié entre l'appareil (7) de délivrance de vapeur et l'interstice (4) entre cylindres.
  26. Dispositif selon l'une des revendications 12 à 25, caractérisé par le fait qu'un appareil respectif (7, 7') de délivrance de vapeur est disposé devant l'interstice (4) entre cylindres, des deux côtés de la bande de matériau (5).
EP93120500A 1993-01-16 1993-12-20 Procédé pour améliorer la brillance et/ou le lissé d'une bande Expired - Lifetime EP0609544B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301023 1993-01-16
DE4301023A DE4301023C3 (de) 1993-01-16 1993-01-16 Vorrichtung zum Erhöhen von Glanz und/oder Glätte einer Papierbahn

Publications (3)

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EP0609544A1 EP0609544A1 (fr) 1994-08-10
EP0609544B1 true EP0609544B1 (fr) 1997-04-16
EP0609544B2 EP0609544B2 (fr) 2007-04-18

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US (2) US5914008A (fr)
EP (1) EP0609544B2 (fr)
JP (1) JP2672256B2 (fr)
CA (1) CA2110786C (fr)
DE (2) DE9320455U1 (fr)
FI (1) FI100671B (fr)

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Also Published As

Publication number Publication date
US5914008A (en) 1999-06-22
JPH06235187A (ja) 1994-08-23
DE4301023C2 (de) 1996-08-22
US6260481B1 (en) 2001-07-17
FI940102A0 (fi) 1994-01-10
CA2110786C (fr) 1997-09-16
EP0609544B2 (fr) 2007-04-18
FI940102A (fi) 1994-07-17
DE9320455U1 (de) 1994-08-25
DE4301023A1 (de) 1994-07-21
DE4301023C3 (de) 2001-07-26
FI100671B (fi) 1998-01-30
CA2110786A1 (fr) 1994-07-17
EP0609544A1 (fr) 1994-08-10
JP2672256B2 (ja) 1997-11-05

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