EP2202356B1 - Système d'ajustement et de contrôle du contenu en eau en papier durant le cycle de production - Google Patents

Système d'ajustement et de contrôle du contenu en eau en papier durant le cycle de production Download PDF

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Publication number
EP2202356B1
EP2202356B1 EP08172811A EP08172811A EP2202356B1 EP 2202356 B1 EP2202356 B1 EP 2202356B1 EP 08172811 A EP08172811 A EP 08172811A EP 08172811 A EP08172811 A EP 08172811A EP 2202356 B1 EP2202356 B1 EP 2202356B1
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EP
European Patent Office
Prior art keywords
paper
devices
production line
section
humidity
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.)
Not-in-force
Application number
EP08172811A
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German (de)
English (en)
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EP2202356A1 (fr
Inventor
Vincenzo Cuomo
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.)
CUONO, VINCENZO
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TECNERGA Srl
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Publication date
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Priority to EP08172811A priority Critical patent/EP2202356B1/fr
Priority to AT08172811T priority patent/ATE529568T1/de
Publication of EP2202356A1 publication Critical patent/EP2202356A1/fr
Application granted granted Critical
Publication of EP2202356B1 publication Critical patent/EP2202356B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/16—Drying webs by electrical heating
    • D21F5/167—Microwave heating

Definitions

  • the present invention concerns devices for checking paper quality control parameters during the production cycle, and in particular it concerns a new system for adjusting and controlling the water content in paper in the transverse direction with respect to the forming direction during the production cycle.
  • a system for adjusting and controlling the humidity content of paper during the production cycle is known from DE 4 221 904 A1 .
  • the paper production cycle includes the preparation of the liquid compound for the production of the paper sheet, said compound consisting of approximately 99 % of water and of cellulose fibre and technological aids for the remaining 0,4-1 %, said fibre and additive percentage varying according to the weight and type of paper to be produced.
  • Said liquid compound is introduced in the system and spread homogeneously on a surface, commonly defined forming wire, having first of all the function to guarantee the distribution of the fibre and the natural drainage of at least part of the water.
  • Said formation wire slides so that the liquid compound spread on it passes through various processing stations, where it is progressively dehydrated due to the effect of gravity only and/or due to the action of vacuum sucking devices.
  • the paper web has a content of dry material that ranges from 15 to 20%.
  • the material is pressed and further dehydrated until reaching a fibre content included between 40 and 50%, according to the technology adopted and the type of product.
  • said dehydration is obtained by pressing, through the use of pressing cylinders and a simultaneous sucking action.
  • drying the sheet further means using considerable energy.
  • heat energy is employed, in the form of vapour or infrared radiation.
  • the paper web obtained in this way before being wound in a coil, passes through a continuous computerized monitoring station that carries out nondestructive measurements mainly focused on two parameters, that is, grammage and humidity.
  • the grammage parameter that is, the weight expressed in grams per square meter of paper, is determined using a scanner installed downstream of the production line, before the final winder.
  • Said scanner employs radiation emitters and, by means of an apposite correlation algorithm, determines said grammage starting from the evaluation of the intensity extinction of said radiations.
  • the grammage control system thus works retroactively and communicates with the devices installed upstream of the system and responsible for adjusting the quantity of liquid compound introduced in the production line.
  • Said devices therefore, modify said quantity of liquid compound according to the grammage measured downstream of the system.
  • Sensors are also known that are positioned downstream of the production line, too, and that are suited to determine the variations in the grammage value along different sections positioned crosswise with respect to the direction of the production line.
  • Said sensors thus make it possible to retroactively correct the grammage values, thus guaranteeing rather limited variability, in the order of 0.1 - 0.2%.
  • the humidity contained in the paper web in the systems known at present said value is determined by means of a measuring head installed on said scanner for measuring the grammage, that is, downstream of the production line.
  • the presence of some more or less humid areas can be due for example to the non-homogeneous distribution of the compound during the formation step, or to particular conditions in the setting up of the system.
  • the humidity control system works retroactively, causing a variation in the heat energy introduced upstream of the system in order to obtain the evaporation of water.
  • This system is rather effective in the control of the water content in the longitudinal direction with respect to the production line.
  • the devices currently known are able to operate on areas or bands whose width exceeds a dozen centimetres, while the humid areas, that is, the areas containing more water than desired, are often narrower, so that the dehumidifying process involves also portions of the paper web that are already in optimal humidity conditions and that therefore do not need a higher energy supply.
  • a further drawback posed by the known technique lies in that the heat is always supplied to the paper web from the outside towards the inside, so that a positive humidity gradient is inevitably obtained from the surface layers of the paper web towards the inner layers of the same, and consequently the surface layers contain less water than the inner ones.
  • This gradient is a function of the total thickness of the paper web and of the possible use of technological-functional aids employed in the production cycle.
  • the main object of the present invention is to guarantee minimum variability of the humidity content in paper both in the longitudinal direction with respect to the production line and crosswise.
  • Another object of the present invention is to be able to treat in a focused manner and with maximum precision only the areas or paper portions that require such a treatment, according to the humidity profile measured along one or more cross sections of the paper web.
  • Another object of the present invention is to minimize the humidity gradient between the surface layers and the inner layers of the paper web, by means of microwave dehumidifying devices that effectively act on the innermost part of the web thickness, differently from the systems currently used.
  • Another object of the present invention is to ensure reduced treatment times, particularly in relation to the feeding speed of the paper web in the production line.
  • the new system for adjusting and controlling at least the water content in paper during the production cycle comprising one or more dehumidifying devices that emit microwaves at controlled frequency, connected to at least one device suited to measure and determine the paper humidity profile along at least one given cross section, said cross section being preferably located downstream of the production line and of said microwave emitting devices.
  • Said measuring device thus acts retroactively, determining the humidity content profile of a cross section downstream of the production line.
  • the data referring to said humidity profile are processed by an electronic unit that communicates with said microwave emitting devices positioned upstream, activating or deactivating them and/or adjusting their power so that they have effect only on the areas with humidity peaks above the reference value or outside a reference interval.
  • Said microwave emitting devices are preferably installed on a head and are suited to act on all the points of a cross section located upstream of said cross section where the measurement has been carried out.
  • said head is a mobile head, travelling crosswise with respect to the direction of the production line, in such a way as to position said microwave emitting devices exactly at the height of the paper portion to be dehumidified, according to the humidity profile given by said measuring device.
  • the main advantage offered by the new control system lies in that it makes use of said dehumidifying devices that emit microwaves and are suited to make the water contained in the paper evaporate starting from the innermost layers, thus obtaining also the normalization of the humidity gradient through the thickness of the paper web.
  • the surface layers of paper will not be drier than the inner layers, as is the case when the known drying systems, for example the drying cylinders, are used.
  • microwave emitters guarantees higher precision of the paper dehumidifying treatment, since even very narrow or very wide areas can be treated.
  • the action of the microwave emitting devices is very rapid, in fact said devices can be activated and deactivated instantaneously and operate rather quickly, differently from the known dehumidifying devices that on the contrary do not have the same effects in the required time as dictated by the paper feeding speed, considering also the heat insulation effect exerted by the paper surface layers.
  • the new system for adjusting and controlling the water content can be installed in paper (F) production plants.
  • the paper (F) produced in webs by pouring on a surface a given quantity of liquid compound consisting of water and cellulose fibre, slides in a direction (X), or direction of the production line, and passes through various stations, where it is progressively dehydrated so that the dry material passes from the initial value of 0.4-1 % to an optimal value of 40-50%.
  • the new system for adjusting and controlling the water content comprises one or more dehumidifying devices (M) that emit microwaves at controlled frequency, suited to treat at least one area of the paper web (F).
  • M dehumidifying devices
  • Said dehumidifying devices (M) are arranged at the level of at least one part or section (F1) of the paper web (F), crosswise (Y) with respect to the direction (X) of the production line and therefore, while the paper slides in said direction (X), said dehumidifying devices (M) treat a longitudinal area (Fm), that is, an area that is parallel to said direction (X) of the production line.
  • said dehumidifying devices (M) are installed on a head (T) in such a way as to allow the paper (F) to be treated alternately or simultaneously on all the points of said section (F1).
  • said head (T) can move and travel crosswise (Y) with respect to the direction (X) of the production line, in such a way as to position one or more of said microwave emitting devices (M) along said section (F1) only at the level of the portion of paper (F) to be treated.
  • the new adjusting and controlling system also comprises at least one measuring device (C) suited to determine the humidity profile (P) of the paper web (F) along a measurement section (F2) preferably located downstream of the section (F1) to be treated by said microwave emitting devices (M).
  • Said measuring device (C) determines the humidity content at every point of said measurement section (F2), thus tracing a profile (P) as schematically shown in Figure 1 .
  • peak values (P1) are taken that, for example, are higher than a reference value (Pr), for example an average or optimal value, or than the maximum value of a reference interval.
  • Said profile (P) also shows peak values (P2) that are lower than the reference value (Pr) or than the minimum value of a reference interval.
  • Said measuring device (C) thus operates retroactively, determining the humidity profile (P) of a measurement section (F2) located downstream of the section (F1) where the dehumidifying treatment is carried out with respect to the direction (X) of the production line.
  • the new adjusting and controlling system also comprises at least one electronic unit (S) that receives from said measuring device (C) the data concerning said humidity profile (P), processes them and, through a PLC control unit (R) of said microwave emitting devices (M), activates or deactivates one or more of said microwave emitting devices (M) so that they operate in a focused manner only on some portions (Fx) of the paper web (F).
  • microwave emitting devices (Mx) are activated, said microwave emitting devices (Mx) being positioned and operating only on the corresponding section (F1x) of paper (F) that is aligned, along said direction (X) of the production line, with said section (F2x) presenting said peak humidity values (P1).
  • said activated microwave emitting devices (Mx) thus generate a continuous band (Fx) of dehumidified paper.
  • Said measuring device (C) being positioned downstream of said microwave emitting devices (Mx) and therefore of said dehumidified band (Fx), continues measuring said humidity profile (P) and, according to the measured values, deactivates said microwave emitting devices (Mx) or modifies their power so that the paper (F) is correctly dehumidified.
  • Said electronic unit (S) processes said data concerning said humidity profile (P), identifying also peak values (P2) that are lower than a reference value or value interval and, through said PLC control unit (R) of said microwave emitting devices (M), deactivates and/or modulates the power of one or more of said microwave emitting devices (Mx) that act on said portions of paper (F) aligned, along said direction (X) of the production line, with the portions of said measurement section (F2) corresponding to said peak values (P2).
  • the humidity ratio of the paper (F) is thus controlled continuously in the different areas, both in the longitudinal direction, that is, parallel to the direction (X) of the production line, and crosswise (Y).
  • Said microwave dehumidifying devices (M) cause the evaporation of the water contained in the paper (F) starting from the innermost layers, thus obtaining also the normalization of the humidity gradient through the thickness of the paper (F), that is, also in the direction (Z) orthogonal to the sliding plane (XY) of the paper (F).

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  • Paper (AREA)

Claims (2)

  1. Système pour le réglage et le contrôle du contenu d'humidité dans le papier (F) durant le cycle productif dans des installations pour la production de papier, comprenant un ou plusieurs dispositifs aptes à déshumidifier ledit papier (F), lesdits dispositifs de déshumidification comprenant un ou plusieurs dispositifs (M, Mx) qui émettent des microondes à fréquence contrôlée et qui sont aptes à traiter au moins une zone du papier (F) durant le coulissement dudit papier (F), à hauteur d'au moins une section (F1) à traiter disposée transversalement (Y) par rapport à la direction de coulissement (X) dudit papier (F), ledit système comprenant en outre :
    • un ou plusieurs dispositifs de détection (C) aptes à déterminer le profil d'humidité (P) dudit papier (F) le long d'au moins une section transversale de détection (F2), et où ladite section de détection (F2) est positionnée en aval de la zone à déshumidifier et desdits dispositifs émettant des microondes (M) par rapport à ladite direction (X) de la ligne de production ;
    • au moins une unité électronique (S) apte à recevoir des données d'un ou plusieurs desdits dispositifs de détection (C) de façon à déterminer ledit profil d'humidité (P), à élaborer lesdites données identifiant les valeurs de crête (P1) supérieures à une valeur ou un intervalle de valeurs de référence et, au moyen d'au moins une centrale de contrôle PLC (R) desdits dispositifs émettant des microondes (M), à activer/désactiver et/ou à modifier la puissance d'un ou plusieurs desdits dispositifs émettant des microondes (Mx) qui n'agissent que sur des portions (F1x) de ladite section (F1) à traiter alignée, le long de ladite direction (X) de la ligne de production, avec des portions (F2x) de ladite section de détection (F2) correspondant auxdites valeurs de crête (P1),
    et où, en combinaison avec le mouvement d'alimentation du papier dans ladite direction (X) de la ligne de production, lesdits dispositifs émettant des microondes (Mx) génèrent une bande déshumidifiée (Fx), ladite bande (Fx) étant parallèle à ladite direction (X) de la ligne de production et ayant une largeur essentiellement égale à ladite portion de section (F1x) à traiter, caractérisé en ce que lesdits dispositifs déshumidifiants (M) sont installés sur une tête (T) qui se déplace en direction transversale (Y) par rapport à ladite direction (X) de la ligne de production, de façon à ce que lesdits dispositifs déshumidifiants (M) sont positionnés seulement à hauteur d'un ou plusieurs points ou portions (F1x) de ladite section (F1) à traiter.
  2. Système pour le réglage et le contrôle d'au moins le contenu d'humidité du papier (F) durant le cycle productif selon la revendication 1, caractérisé en ce que ladite unité électronique (S) élabore lesdites données relatives au profil d'humidité (P), identifiant les valeurs de crête (P2) qui sont inférieures à une valeur ou un intervalle de valeurs de référence et, au moyen de ladite unité de contrôle PLC (R) desdits dispositifs émettant des microondes (M), active/désactive et/ou modifie la puissance d'un ou plusieurs desdits dispositifs émettant des microondes (M) qui agissent sur des portions de papier (F) alignées, le long de ladite direction (X) de la ligne de production, avec les portions de ladite section de détection (F2) correspondant auxdites valeurs de crête (P2).
EP08172811A 2008-12-23 2008-12-23 Système d'ajustement et de contrôle du contenu en eau en papier durant le cycle de production Not-in-force EP2202356B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08172811A EP2202356B1 (fr) 2008-12-23 2008-12-23 Système d'ajustement et de contrôle du contenu en eau en papier durant le cycle de production
AT08172811T ATE529568T1 (de) 2008-12-23 2008-12-23 System zum einstellen und kontrollieren des wassergehalts von papier während des produktionszyklus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08172811A EP2202356B1 (fr) 2008-12-23 2008-12-23 Système d'ajustement et de contrôle du contenu en eau en papier durant le cycle de production

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EP2202356A1 EP2202356A1 (fr) 2010-06-30
EP2202356B1 true EP2202356B1 (fr) 2011-10-19

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AT (1) ATE529568T1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI74062C (fi) * 1985-12-12 1987-12-10 Imatran Voima Oy Foerfarande och anordning foer minskning hoegfrekvent elenergi av fuktighetsdifferenserna hos en roerlig bana medelst.
SE9100064L (sv) * 1991-01-07 1992-07-08 Sven Gunnar Nygren Torkningsanordning
DE4221904C2 (de) * 1992-07-03 1999-09-23 Bhs Corr Masch & Anlagenbau Heizvorrichtung für eine bewegte Wellpappenbahn
DE19841638A1 (de) * 1998-09-11 2000-03-16 Voith Sulzer Papiertech Patent Feuchteprofilierung

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EP2202356A1 (fr) 2010-06-30
ATE529568T1 (de) 2011-11-15

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