EP2476806A1 - Gluing agent supply system for feeding gluing agent to a sheet of paper or cardboard - Google Patents

Gluing agent supply system for feeding gluing agent to a sheet of paper or cardboard Download PDF

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Publication number
EP2476806A1
EP2476806A1 EP11195307A EP11195307A EP2476806A1 EP 2476806 A1 EP2476806 A1 EP 2476806A1 EP 11195307 A EP11195307 A EP 11195307A EP 11195307 A EP11195307 A EP 11195307A EP 2476806 A1 EP2476806 A1 EP 2476806A1
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EP
European Patent Office
Prior art keywords
sizing agent
glue
paper
sizing
supply
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.)
Granted
Application number
EP11195307A
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German (de)
French (fr)
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EP2476806B1 (en
Inventor
Jukka Sarvela
Jyrki Arola
Kai Kuoppa
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Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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Publication date
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Publication of EP2476806A1 publication Critical patent/EP2476806A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/20—Apparatus therefor
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper

Definitions

  • the present invention relates to a glue delivery system, preferably for a machine for processing a paper or board web, for supplying sizing agent to a paper or board web.
  • independent (e.g., two) glue delivery systems are used to deliver glue to respective glue application bars.
  • a glue delivery system for a glue agent application bar is provided in each case.
  • one glue delivery system is provided for the one glue application bar
  • the other glue delivery system is for the other glue application bar.
  • the two glue application bars are usually arranged such that the one glue application bar applies the glue to one side of the paper or board in a size press in a dryer section in a paper or board making machine, whereas the other glue side applies to the other side (FIG. eg upper web page) of the paper or board web is arranged to apply on this web page the sizing agent accordingly.
  • each glue supply system has a respective supply tank, a pump, a sieve and corresponding conduits for supplying the sizing agent during a pumping operation of the pump from the supply tank via the sifter and the lines to the corresponding sizing agent application bar.
  • the glue delivery system of the prior art requires a large space because the respective leads and elements are provided separately for each glue delivery system.
  • the equipment costs and the maintenance costs increase.
  • each to provide appropriate control and automation control which further increase the cost of equipment.
  • positive displacement pumps e.g., screw pumps
  • the object of the present invention is achieved by a glue delivery system having the features of claim 1.
  • a glue delivery system preferably for a machine for processing a paper or board web, for delivering sizing agent to a paper or board web having at least two sizing agent applicators for applying the sizing agent to the paper or board web which are connected to a common glue supply device, by which the sizing agent can be supplied to the glue application devices.
  • the common glue means serves to supply glue to the at least two glue applying means.
  • the wiring and the structure for supplying the sizing agent simplify considerably.
  • the common glue supply means is necessary to supply the sizing agent to the sizing agent applicators, the installation space of the glue sizing system can be reduced. Therefore, both the equipment and the maintenance costs of the sizing agent system according to the invention are reduced.
  • the control and control required to deliver the sizing agent to the sizing applicators is reduced because centralized control and control of the co-sizing means allows the sizing agent to be delivered to the sizing agent applicators.
  • the glue supply means comprises a centrifugal pump (centrifugal pump) for pumping the sizing agent to the sizing agent applicators.
  • centrifugal pump centrifugal pump
  • Such a centrifugal pump is a turbomachine, which uses the centrifugal force to convey the sizing agent by means of a rotating impeller.
  • the glue which enters the pump via a suction pipe, is sucked by the rotating pump impeller and forced on a circular path radially outwards.
  • the thus absorbed kinetic energy of the sizing agent increases the pressure within the pump and conveys the sizing agent into a pressure tube of the pump and thus on to the sizing agent applicators.
  • the centrifugal pump thus has a simple and robust design. By their operation, the sizing agent can be reliably fed (pumped) to the sizing agent applicators.
  • centrifugal pumps can be operated at higher speeds than positive displacement pumps (eg at 1500 to 3000 rpm instead of 200 rpm).
  • a part of the pump loss can be converted into heat energy, whereby a temperature increase is achieved in the sizing agent to be conveyed.
  • This has a positive effect on glue glue application behavior. Namely, as the temperature of the sizing agent increases, the viscosity of the sizing agent is reduced, thereby improving the penetrability of the sizing agent into the paper or board web.
  • This heating of the sizing agent by pump operation allows excellent sizing qualities to be achieved.
  • no further additional means heat exchangers, heating elements, etc. are required in the glue supply system to achieve heating of the sizing agent for sizing the paper or board web.
  • the pump is disposed in the common glue supply means, the same heated glue means is used in the glueing operation by the glue application means connected to the glue supply means.
  • the glue supply means comprises a supply tank in which the sizing agent is receivable and at least one sifting means by which the sizing agent supplied from the supply tank to the sizing agent applying means by the centrifugal pump is sifted and cleaned.
  • the screening device may comprise at least two screens, which may be arranged in parallel in a glue supply line connected to the glue application devices.
  • the sieve or sieves may be the same in construction and thus have the same dimensions as those sieves used in the glue supply system according to the prior art described above. Due to the parallel connection of these screens, it is therefore not necessary to use other sieve sizes.
  • the same throughput of sizing agent can be achieved by the respective sieves, as in the systems of the prior art, in which one sieve per system is provided. Therefore, a desired filtering and cleaning efficiency can be reliably achieved.
  • the sizing agent applicators and the common sizing agent delivery means are interconnected via a common sizing agent delivery conduit via which the sizing agent is deliverable to the sizing agent applicators and a common return conduit through which excess sizing agent is traceable to the sizing agent delivery conduit.
  • the common return line with a relatively long service life (i.e., shutdown time) of the glue supply system, it can be prevented from remaining in the lines and system as it is returned to the glue supply tank through the corresponding line loop.
  • the return line may be connected to the sizing agent applicator and the feed tank and is capable of returning excess sizing agent to the feed tank.
  • At least one screening device is preferably provided in the return line in order to screen and clean the excess sizing agent.
  • This sieve device in the return line can be the same sieve device as that in the glue supply device, so that the excess sizing agent is already returned to the sizing agent supply tank in a cleaned state, whereby the filtering and cleaning efficiency is again increased.
  • the sieve device in the glue supply device, can be provided in the return line in order to clean the sizing agent which is to be introduced into the feed tank accordingly.
  • the screening device preferably has two screens, which are arranged in the return line in parallel. This arrangement has the same advantages as the arrangement of the screens in parallel in the common glue supply line.
  • a throttling device may be provided between the centrifugal pump and the glue applying means in the glue supply means.
  • This throttle device eg, adjustable throttle valve
  • the sizing application devices may be, for example, film transfer glue application units, glue application bars and / or sizing agent presses.
  • the sizing agent applicators are preferably arranged such that the sizing agent can be applied to both web sides of the paper or board web. By appropriately regulating the amount of sizing agent to be applied by the sizing agent applicators, equal or different amounts of sizing agent can be applied to the two web sides.
  • the same sizing agent can be applied to both web sides of the paper or board web to be sizing by means of the sizing agent applicators. That is, the sizing agent having the same dry content, viscosity and temperature can be used to provide a sizing degree to web sides (e.g., front and back) of the paper or board web.
  • the glue supply system comprises a glue storage tank in which sizing agent is storable to feed the sizing agent from the sizing agent storage tank into the common glue supply means.
  • This glue store may be switchable to the glue supply system or may be stationarily connected to the feed tank.
  • the sizing agent storage tank may be a mobile unit that may be used with various glue supply systems in a paper mill to deliver sizing agents to the respective supply tanks of the various glue delivery systems if the glue consumption in the respective glue delivery systems has exceeded a predetermined value.
  • the sizing agent storage tank is preferably arranged such that the sizing agent can be fed from the sizing agent storage tank to the supply tank. This can be done with a separate conduit to the supply tank or the sizing agent can be drained directly (without conduit) from the sizing agent storage tank into the sizing agent supply tank.
  • sizing agent As the sizing agent to be supplied, sizing agent, pigment-free sizing agent, pigment-containing sizing agent, pigment-free or pigment-containing coloring agent may be used become.
  • the sizing agent delivery system may be used to deliver pigment-containing agents to the sizing agent applicators to pigment the web side (s) of the paper or board web (eg, to make precursors, improve the quality of surface sized paper, etc.).
  • the term "sizing agent” as used in the claims comprises: sizing agents (sizing agents), agents for pigmentation (eg a sizing agent with binder and pigments) and colorants for coloring. For the refinement of the surface fillers or filler pigments may be used, wherein pigmented sizing agent may also be colored.
  • a sizing agent preferably having a dry content of 5-16% and a viscosity of 20-60 mPas Brookfield 100 rpm can be used.
  • the dry content of the sizing agent is preferably 10-45% and the viscosity is preferably 20-600 mPas Brookfield 100 U / min.
  • the sizing agent supply system according to the invention is preferably used in a size press in a dryer section in a paper or board making machine to determine the properties and quality of the paper or board web (eg wetting and / or penetration behavior) during paper or board production according to the desired specifications of the paper or board Paper / cardboard boxes (dry content, degree of sizing, etc.).
  • Fig. 1 schematically shows a corresponding structure of the sizing agent supply system according to the invention.
  • the glue supply system of the present invention has a supply tank 1, a centrifugal pump 2, two screens 3, a bottom glue application bar 4, an upper one Glue application bar (glue applicator) 5 and a Leimstoff Eattank 6 on.
  • the feed tank 1, the pump 2 and the screening device 3 form a common glue supply device.
  • the two glue coating application bars 4, 5 are assigned to corresponding web sides of a paper or board web (not shown) to be provided with the glue means. That is, the lower glue application bar 4 is assigned to a lower sheet side (eg, back side) of the paper or board web, while the upper glue coating bar 5 is assigned to the upper sheet side (eg, front side) of the paper or board web, so that the lower glue coating bar 4 is adapted to apply the sizing agent on the back of the paper or board web, while the upper sizing bar 5 can apply the sizing agent to the front of the paper or board web.
  • the sizing agent delivery system of the present invention includes a sizing glue delivery conduit 11, a glue glue delivery conduit (sizing agent delivery conduit) 12 and a glue sizer return conduit 13.
  • the feed tank 1 is connected to the pump 2 by the glue supply line 11, and downstream of the pump 2, the two filters 3 are arranged in parallel in the glue supply line 11.
  • the glue supply line 11 is recombined downstream of the filters 3 and passes into the glue supply connection line 12 which is connected to both glue application bars 4 and 5.
  • Excess sizing agent which is not used for sizing the two web sides of the paper or board web is via the common return line 13 traceable downstream of the two glue applicator bars 4 and 5 to the feed tank 1.
  • the sizing agent storage tank 6 in the present embodiment is connected to the feed tank 1 in a stationary manner via a sizing agent storage tank line which opens into the return line 13 upstream of the feed tank 1.
  • the sizing agent storage tank 6 can also be connected to the supply tank 1 with a separate sizing agent storage tank line. Further, the sizing agent storage tank 6 may be brought over an opening of the supply tank 1 to discharge the sizing agent stored in the sizing agent storage tank 6 into the supply tank 1. Furthermore, the sizing agent storage tank 6 can also be connectable to the supply tank 1 directly by means of a line coupling or via the return line 13 in order to supply sizing agent from the sizing agent storage tank 6 to the supply tank 1.
  • throttling means may be provided between the pump 2 and the glue-applying bars 4, 5 in the glue supply means.
  • a throttle device is arranged downstream of the pump 2 and upstream of the filter 3 in the glue supply line 11.
  • a flow and / or supply pressure of the sizing agent can be adjusted to the glue application bar 4.5.
  • the pump 2 is a centrifugal pump, by a corresponding speed control or by a corresponding regulation of the flow rate of the sizing agent through the centrifugal pump, the pump losses for heating (temperature) of the sizing agent can be used, e.g.
  • the sizing agent may be heated to a temperature (e.g., 85 ° C) which is particularly advantageous for sizing the web sides of the paper or board web.
  • the sizing agent is sucked by the pumping operation of the pump 2 from the supply tank 1, thereby supplying the sizing agent to the sieves 3, filtered in this accordingly and cleaned, then merged again into the common supply line 11 and fed to the two glue application bar 4, 5 via the glue supply connection line 12.
  • Excess sizing agent which is not used in the sizing of the two web sides of the paper or board web, is traceable via the common return line 13 to the feed tank 1.
  • a corresponding screening device eg, the two screens, which are arranged in the glue supply line 11
  • the sieves 3 used are the same sieves used in the glue delivery systems of the prior art.
  • the corresponding stocks of sieves can be used without new sieve sizes are used.
  • glue coating bars are provided. It is also possible to provide more than two glue application bars as glue application devices, provided that these are connected to the common glue supply device, through which the glue can be supplied to them.
  • sizing agent application bars are provided as sizing agent applicators.
  • Film transfer glue application units and / or glue presses may also be used.
  • any combination of size coat bars, film size coaters, and / or size presses may be used as size applicators to which the size agent is delivered via the common size feeder.
  • the bottom glue application bar is associated with the back (bottom web side) of the paper or board web
  • the top glue bar is associated with the front (upper web side) of the paper or board web.
  • the screens may be arranged in series in the glue supply system. A combination of series and parallel connection of the sieves is possible.
  • the supply line may have two or more screens in parallel. It can also be connected in series, which may be designed as Siebkaskade with decreasing in the flow direction mesh size (finer sieves) and sieves.
  • sizing agent includes all sizing agents suitable for sizing paper; these may be pigment-containing or pigment-free, containing or free of fillers, dyed or undyed and optionally provided with further additives.
  • the web side (s) of the paper or board web may be appropriately pigmented by means of the sizing application means (corresponding to colorant applicators or filler applicators) (e.g., for the preparation of precursors, to improve the quality of surface sized paper, etc.).
  • the sizing application means corresponding to colorant applicators or filler applicators

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Sizing agent supply system, preferably for a machine for processing a paper- or board web, for supplying sizing agent to a paper- or board web, comprises at least two sizing agent application devices (4, 5) for applying the sizing agent on the paper- or board web, which are connected to a common sizing agent supply device through which the sizing agent is fed to the sizing agent application devices.

Description

Die vorliegende Erfindung betrifft ein Leimmittelzufuhrsystem, vorzugsweise für eine Maschine zum Bearbeiten von einer Papier- oder Kartonbahn, zum Zuführen von Leimmittel zu einer Papier- oder Kartonbahn.The present invention relates to a glue delivery system, preferably for a machine for processing a paper or board web, for supplying sizing agent to a paper or board web.

Gemäß einer Struktur der aus dem Stand der Technik bekannten Leimmittelzufuhrsysteme werden voneinander unabhängige (z.B. zwei) Leimmittelzufuhrsysteme zum Zuführen von Leimmittel zu jeweiligen Leimmittelauftragsbalken verwendet. Insbesondere ist jeweils ein Leimmittelzufuhrsystem für einen Leimmittelauftragsbalken vorgesehen. Zum Beispiel ist das eine Leimmittelzufuhrsystem für den einen Leimmittelauftragsbalken vorgesehen, wohingegen das andere Leimmittelzufuhrsystem für den anderen Leimmittelauftragsbalken vorgesehen ist. Die beiden Leimmittelauftragsbalken sind üblicherweise derart angeordnet, dass der eine Leimmittelauftragsbalken das Leimmittel auf eine Bahnseite (z.B. untere Bahnseite) der Papier- oder Kartonbahn in einer Leimpresse in einer Trockenpartie in einer Papier- oder Kartonherstellungsmaschine aufbringt, wohingegen der andere Leimmittelauftragsbalken für die andere Seite (z.B. obere Bahnseite) der Papier- oder Kartonbahn angeordnet ist, um auf diese Bahnseite das Leimmittel entsprechend aufzutragen. Gemäß dem Stand der Technik hat jedes Leimmittelzufuhrsystem einen entsprechenden Zufuhrtank, eine Pumpe, eine Siebeinrichtung (Sieb) und entsprechende Leitungsführungen, um das Leimmittel während eines Pumpbetriebs der Pumpe von dem Zufuhrtank über die Siebeinrichtung und den Leitungen zu dem entsprechenden Leimmittelauftragsbalken zuzuführen.In accordance with one structure of the glue delivery systems known in the prior art, independent (e.g., two) glue delivery systems are used to deliver glue to respective glue application bars. In particular, a glue delivery system for a glue agent application bar is provided in each case. For example, one glue delivery system is provided for the one glue application bar, whereas the other glue delivery system is for the other glue application bar. The two glue application bars are usually arranged such that the one glue application bar applies the glue to one side of the paper or board in a size press in a dryer section in a paper or board making machine, whereas the other glue side applies to the other side (FIG. eg upper web page) of the paper or board web is arranged to apply on this web page the sizing agent accordingly. According to the prior art, each glue supply system has a respective supply tank, a pump, a sieve and corresponding conduits for supplying the sizing agent during a pumping operation of the pump from the supply tank via the sifter and the lines to the corresponding sizing agent application bar.

Das Leimmittelzufuhrsystem gemäß dem Stand der Technik erfordert daher einen großen Bauraum, da die jeweiligen Leitungsführungen und Elemente für jedes Leimmittelzufuhrsystem separat vorgesehen sind. Somit erhöhen sich die Anlagenkosten und die Wartungskosten. Ferner ist in den Leimmittelzufuhrsystemen jeweils eine entsprechende Regelungs- und Steuerungsautomatisierung vorzusehen, wodurch sich die Anlagenkosten weiter erhöhen.Therefore, the glue delivery system of the prior art requires a large space because the respective leads and elements are provided separately for each glue delivery system. Thus, the equipment costs and the maintenance costs increase. Further, in the glue delivery systems each to provide appropriate control and automation control, which further increase the cost of equipment.

Des Weiteren werden bei den bekannten Leimmittelzufuhrsystemen zum Zuführen von Leimmittel von dem jeweiligen Zufuhrtank zu dem jeweiligen Leimmittelauftragsbalken Verdrängerpumpen (z.B. Schraubenpumpen) verwendet, um ein genaues Dosieren und Regeln der zuzuführenden Menge an Leimmittel gewährleisten zu können.Further, in the known glue delivery systems for delivering sizing agents from the respective supply tank to the respective glue application bar, positive displacement pumps (e.g., screw pumps) are used to ensure accurate metering and control of the amount of sizing agent to be delivered.

Es ist eine Aufgabe der vorliegenden Erfindung, ein bekanntes Leimmittelzufuhrsystem derart zu verbessern, dass die Abmessungen (Baugröße) des Leimmittelzufuhrsystems verringert sind und dass die Anlagenkosten und Wartungskosten für das Leimmittelzufuhrsystem niedriger ausfallen.It is an object of the present invention to improve a known glue delivery system such that the size of the glue supply system is reduced and that the cost of equipment and maintenance of the glue supply system are lower.

Die Aufgabe der vorliegenden Erfindung wird durch ein Leimmittelzufuhrsystem mit den Merkmalen nach Anspruch 1 gelöst.The object of the present invention is achieved by a glue delivery system having the features of claim 1.

Vorteilhafte Weiterbildungen sind in den Unteransprüchen definiert.Advantageous developments are defined in the subclaims.

Gemäß einem Gesichtspunkt der vorliegenden Erfindung ist ein Leimmittelzufuhrsystem, vorzugsweise für eine Maschine zum Bearbeiten von einer Papier- oder Kartonbahn, zum Zuführen von Leimmittel zu einer Papier- oder Kartonbahn bereitgestellt, das zumindest zwei Leimmittelauftrageeinrichtungen zum Auftragen des Leimmittels auf die Papier- oder Kartonbahn hat, die mit einer gemeinsamen Leimmittelzufuhreinrichtung verbunden sind, durch die das Leimmittel den Leimmittelauftrageeinrichtungen zuführbar ist.According to one aspect of the present invention, there is provided a glue delivery system, preferably for a machine for processing a paper or board web, for delivering sizing agent to a paper or board web having at least two sizing agent applicators for applying the sizing agent to the paper or board web which are connected to a common glue supply device, by which the sizing agent can be supplied to the glue application devices.

Gemäß dem vorstehenden Gesichtspunkt dient bei dem erfindungsgemäßen Leimmittelzufuhrsystem die gemeinsame Leimmitteleinrichtung dazu, dass Leimmittel zu den zumindest zwei Leimmittelauftrageeinrichtungen zuzuführen. Somit vereinfachen sich die Leitungsführung und der Aufbau zum Zuführen des Leimmittels erheblich. Zudem ist sichergestellt, dass dasselbe Leimmittel zu den Leimmittelauftrageeinrichtungen gefördert wird, wodurch Qualitätsunterschiede wegen unterschiedlicher Leimmittel beim Leimen von Papier- oder Kartonbahnen ausgeschlossen werden können. Da nur noch die gemeinsame Leimmittelzufuhreinrichtung notwendig ist, um das Leimmittel zu den Leimmittelauftrageeinrichtungen zuzuführen, kann der Bauraum des Leimmittelsystems verkleinert werden. Daher verringern sich sowohl die Anlagen- als auch die Wartungskosten des erfindungsgemäßen Leimmittelsystems. Ferner verringert sich der Regelungs-und Steuerungsaufwand, der erforderlich ist, um das Leimmittel zu den Leimmittelauftrageeinrichtungen zuzuführen, da durch eine zentrale Regelung und Steuerung der gemeinsamen Leimmitteleinrichtung das Leimmittel den Leimmittelauftrageeinrichtungen zugeführt werden kann.According to the above aspect, in the glue supply system of the present invention, the common glue means serves to supply glue to the at least two glue applying means. Thus, the wiring and the structure for supplying the sizing agent simplify considerably. In addition, it is ensured that the same sizing agent is conveyed to the sizing application devices, whereby quality differences due to different sizing agents in the sizing of paper or board webs can be excluded. Since only the common glue supply means is necessary to supply the sizing agent to the sizing agent applicators, the installation space of the glue sizing system can be reduced. Therefore, both the equipment and the maintenance costs of the sizing agent system according to the invention are reduced. Further, the control and control required to deliver the sizing agent to the sizing applicators is reduced because centralized control and control of the co-sizing means allows the sizing agent to be delivered to the sizing agent applicators.

Bevorzugt weist die Leimmittelzufuhreinrichtung eine Zentrifugalpumpe (Kreiselpumpe) zum Pumpen des Leimmittels zu den Leimmittelauftrageeinrichtungen auf.Preferably, the glue supply means comprises a centrifugal pump (centrifugal pump) for pumping the sizing agent to the sizing agent applicators.

Eine solche Zentrifugalpumpe ist eine Strömungsmaschine, die mittels eines rotierenden Laufrads die Zentrifugalkraft zur Förderung des Leimmittels nutzt. Das Leimmittel, das über ein Saugrohr in die Pumpe eintritt, wird vom sich drehenden Pumpenlaufrad angesaugt und auf einer Kreisbahn radial nach außen gezwungen. Die somit aufgenommene Bewegungsenergie des Leimmittels erhöht den Druck innerhalb der Pumpe und fördert das Leimmittel in ein Druckrohr der Pumpe und somit weiter zu den Leimmittelauftrageeinrichtungen. Die Zentrifugalpumpe weist somit eine einfache und robuste Bauart auf. Durch ihren Betrieb kann das Leimmittel zuverlässig zu den Leimmittelauftrageeinrichtungen zugeführt (gepumpt) werden.Such a centrifugal pump is a turbomachine, which uses the centrifugal force to convey the sizing agent by means of a rotating impeller. The glue, which enters the pump via a suction pipe, is sucked by the rotating pump impeller and forced on a circular path radially outwards. The thus absorbed kinetic energy of the sizing agent increases the pressure within the pump and conveys the sizing agent into a pressure tube of the pump and thus on to the sizing agent applicators. The centrifugal pump thus has a simple and robust design. By their operation, the sizing agent can be reliably fed (pumped) to the sizing agent applicators.

Wegen ihres einfachen Aufbaus können Zentrifugalpumpen mit höheren Drehzahlen betrieben werden als Verdrängerpumpen (z.B. bei 1500 bis 3000 U/min statt 200 U/min). Bei der Zentrifugalpumpe kann ein Teil des Pumpenverlusts in Wärmeenergie umgewandelt werden, wodurch ein Temperaturanstieg bei dem zu fördernden Leimmittel erreicht wird. Dies wirkt sich positiv auf das Leimmittelauftragsverhalten aus. Nämlich, wenn sich die Temperatur des Leimmittels erhöht, verringert sich die Viskosität des Leimmittels und dadurch ist die Eindringfähigkeit des Leimmittels in die Papier- oder Kartonbahn verbessert. Somit kann beim Leimen von Papier- oder Kartonbahnen durch die Anwendung des erfindungsgemäßen Leimmittelzufuhrsystems eine Leimmitteltemperatur von 85°C oder sogar darüber erreicht werden. Durch diese Erwärmung des Leimmittels durch den Pumpenbetrieb können ausgezeichnete Leimungsqualitäten erreicht werden. Somit sind keine weiteren zusätzlichen Mittel (Wärmetauscher, Heizelemente, etc.) in dem Leimmittelzufuhrsystem erforderlich, um eine Erwärmung des Leimmittels zum Leimen der Papier- oder Kartonbahn zu erreichen.Because of their simple construction, centrifugal pumps can be operated at higher speeds than positive displacement pumps (eg at 1500 to 3000 rpm instead of 200 rpm). With the centrifugal pump, a part of the pump loss can be converted into heat energy, whereby a temperature increase is achieved in the sizing agent to be conveyed. This has a positive effect on glue glue application behavior. Namely, as the temperature of the sizing agent increases, the viscosity of the sizing agent is reduced, thereby improving the penetrability of the sizing agent into the paper or board web. Thus, when sizing paper or board webs by the application of the invention Leihmittelzufuhrsystems a Leimmittel temperature of 85 ° C or even be achieved. This heating of the sizing agent by pump operation allows excellent sizing qualities to be achieved. Thus, no further additional means (heat exchangers, heating elements, etc.) are required in the glue supply system to achieve heating of the sizing agent for sizing the paper or board web.

Ferner wird, da die Pumpe in der gemeinsamen Leimmittelzufuhreinrichtung angeordnet ist, dasselbe erwärmte Leimmittel beim Leimvorgang durch die mit der Leimmittelzufuhreinrichtung verbundenen Leimmittelauftrageeinrichtungen verwendet.Further, since the pump is disposed in the common glue supply means, the same heated glue means is used in the glueing operation by the glue application means connected to the glue supply means.

Bevorzugt weist die Leimmittelzufuhreinrichtung einen Zufuhrtank, in dem das Leimmittel aufnehmbar ist, und zumindest eine Siebeinrichtung auf, durch die das von dem Zufuhrtank durch die Zentrifugalpumpe zu den Leimmittelauftrageeinrichtungen zugeführte Leimmittel gesiebt und gereinigt wird. Die Siebeinrichtung kann zumindest zwei Siebe aufweisen, die in einer mit den Leimmittelauftrageeinrichtungen verbundenen Leimmittelzufuhrleitung in Parallelschaltung angeordnet sein können. Die Siebeinrichtung bzw. die Siebe können die gleiche Bauform und somit dieselben Abmessungen aufweisen, wie jene Siebe, die in dem Leimmittelzufuhrsystem gemäß dem vorstehend beschriebenen Stand der Technik verwendet werden. Durch die Parallelschaltung dieser Siebe ist es somit nicht erforderlich, andere Siebbaugrößen zu verwenden. Zudem kann derselbe Durchfluss an Leimmittel durch die jeweiligen Siebe erreicht werden, wie in den Systemen des Stands der Technik, in denen jeweils ein Sieb pro System vorgesehen ist. Daher kann ein gewünschter Filter- und Reinigungswirkungsgrad zuverlässig erreicht werden.Preferably, the glue supply means comprises a supply tank in which the sizing agent is receivable and at least one sifting means by which the sizing agent supplied from the supply tank to the sizing agent applying means by the centrifugal pump is sifted and cleaned. The screening device may comprise at least two screens, which may be arranged in parallel in a glue supply line connected to the glue application devices. The sieve or sieves may be the same in construction and thus have the same dimensions as those sieves used in the glue supply system according to the prior art described above. Due to the parallel connection of these screens, it is therefore not necessary to use other sieve sizes. In addition, the same throughput of sizing agent can be achieved by the respective sieves, as in the systems of the prior art, in which one sieve per system is provided. Therefore, a desired filtering and cleaning efficiency can be reliably achieved.

Bevorzugt sind die Leimmittelauftrageeinrichtungen und die gemeinsame Leimmittelzufuhreinrichtung über eine gemeinsame Leimmittelzufuhrleitung, über die das Leimmittel den Leimmittelauftrageeinrichtungen zuführbar ist, und eine gemeinsame Rückfuhrleitung, über die überschüssiges Leimmittel zu der Leimmittelzufuhrleitung rückführbar ist, miteinander verbunden.Preferably, the sizing agent applicators and the common sizing agent delivery means are interconnected via a common sizing agent delivery conduit via which the sizing agent is deliverable to the sizing agent applicators and a common return conduit through which excess sizing agent is traceable to the sizing agent delivery conduit.

Somit kann durch das Vorsehen der gemeinsamen Rückfuhrleitung bei einer relativ langen Wartungsdauer (d.h. Abschaltzeit) des Leimmittelzufuhrsystems verhindert werden, dass das Leimmittel in den Leitungen und dem System verbleibt, da es durch den entsprechenden Leitungskreislauf zu dem Leimmittelzufuhrtank rückgeführt wird.Thus, by providing the common return line with a relatively long service life (i.e., shutdown time) of the glue supply system, it can be prevented from remaining in the lines and system as it is returned to the glue supply tank through the corresponding line loop.

Die Rückfuhrleitung kann mit den Leimmittelauftrageeinrichtungen und dem Zufuhrtank verbunden sein und ist in der Lage, dass überschüssige Leimmittel zu dem Zufuhrtank rückzuführen.The return line may be connected to the sizing agent applicator and the feed tank and is capable of returning excess sizing agent to the feed tank.

Bevorzugt ist in der Rückfuhrleitung zumindest eine Siebeinrichtung vorgesehen, um das überschüssige Leimmittel durchzusieben und zu reinigen.At least one screening device is preferably provided in the return line in order to screen and clean the excess sizing agent.

Diese Siebeinrichtung in der Rückfuhrleitung kann dieselbe Siebeinrichtung wie die in der Leimmittelzufuhreinrichtung sein, so dass auch das überschüssige Leimmittel bereits gereinigt zu dem Leimmittelzufuhrtank rückgeführt wird, wodurch der Filter- und Reinigungswirkungsgrad nochmals gesteigert wird.This sieve device in the return line can be the same sieve device as that in the glue supply device, so that the excess sizing agent is already returned to the sizing agent supply tank in a cleaned state, whereby the filtering and cleaning efficiency is again increased.

Alternativ kann auch statt der Siebeinrichtung in der Leimmittelzufuhreinrichtung die Siebeinrichtung in der Rückfuhrleitung vorgesehen sein, um das Leimmittel, das in den Zufuhrtank einzubringen ist, entsprechend zu reinigen.Alternatively, instead of the sieve device in the glue supply device, the sieve device can be provided in the return line in order to clean the sizing agent which is to be introduced into the feed tank accordingly.

Die Siebeinrichtung weist bevorzugt zwei Siebe auf, die in der Rückfuhrleitung in Parallelschaltung angeordnet sind. Diese Anordnung weist dieselben Vorteile wie die Anordnung der Siebe in Parallelschaltung in der gemeinsamen Leimmittelzufuhrleitung auf.The screening device preferably has two screens, which are arranged in the return line in parallel. This arrangement has the same advantages as the arrangement of the screens in parallel in the common glue supply line.

Des Weiteren kann eine Drosseleinrichtung zwischen der Zentrifugalpumpe und den Leimmittelauftrageeinrichtungen in der Leimmittelzufuhreinrichtung vorgesehen sein. Diese Drosseleinrichtung (z.B. einstellbares Drosselventil) kann einen Durchfluss und/oder Zufuhrdruck des Leimmittels innerhalb der Leimmittelzufuhreinrichtung zu den Leimmittelauftrageeinrichtungen einstellen (steuern).Furthermore, a throttling device may be provided between the centrifugal pump and the glue applying means in the glue supply means. This throttle device (eg, adjustable throttle valve) may adjust (control) a flow and / or supply pressure of the sizing agent within the sizing agent supply to the sizing agent applicators.

Die Leimmittelauftrageeinrichtungen können beispielsweise Filmtransferleimmittelauftragseinheiten, Leimmittelauftragsbalken und/oder Leimmittelpressen sein.The sizing application devices may be, for example, film transfer glue application units, glue application bars and / or sizing agent presses.

Die Leimmittelauftrageeinrichtungen sind bevorzugt derart angeordnet, dass das Leimmittel auf beide Bahnseiten der Papier- oder Kartonbahn aufgebracht werden kann. Durch entsprechendes Regulieren der von den Leimmittelauftrageeinrichtungen aufzubringenden Menge an Leimmittel können gleiche oder unterschiedliche Mengen an Leimmittel auf die beiden Bahnseiten aufgebracht werden.The sizing agent applicators are preferably arranged such that the sizing agent can be applied to both web sides of the paper or board web. By appropriately regulating the amount of sizing agent to be applied by the sizing agent applicators, equal or different amounts of sizing agent can be applied to the two web sides.

Somit kann dasselbe Leimmittel auf beide Bahnseiten der zu leimenden Papier-oder Kartonbahn mittels der Leimmittelauftrageeinrichtungen aufgebracht werden. Das heißt, das Leimmittel mit demselben Trockengehalt, derselben Viskosität und derselben Temperatur kann verwendet werden, um Bahnseiten (z.B. Vorder- und Rückseite) der Papier- oder Kartonbahn mit einem entsprechenden Leimungsgrad zu versehen.Thus, the same sizing agent can be applied to both web sides of the paper or board web to be sizing by means of the sizing agent applicators. That is, the sizing agent having the same dry content, viscosity and temperature can be used to provide a sizing degree to web sides (e.g., front and back) of the paper or board web.

Bevorzugt weist das Leimmittelzufuhrsystem einen Leimmittelspeichertank auf, in dem Leimmittel speicherbar ist, um das Leimmittel von dem Leimmittelspeichertank in die gemeinsame Leimmittelzufuhreinrichtung einzuspeisen. Dieser Leimmittelspeicher kann zu dem Leimmittelzufuhrsystem zuschaltbar sein oder kann stationär mit dem Zufuhrtank verbunden sein. Der Leimmittelspeichertank kann eine mobile Einheit sein, die bei verschiedenen Leimmittelzufuhrsystemen in einer Papierfabrik verwendet werden kann, um Leimmittel zu den entsprechenden Zufuhrtanks der verschiedenen Leimmittelzufuhrsysteme zuzuführen, falls der Leimmittelverbrauch in den jeweiligen Leimmittelzufuhrsystemen einen vorbestimmten Wert überschritten hat. Der Leimmittelspeichertank ist bevorzugt derart angeordnet, dass das Leimmittel von dem Leimmittelspeichertank zu dem Zufuhrtank einspeisbar ist. Dies kann mit einer separaten Leitungsführung zu dem Zufuhrtank erfolgen, oder es kann das Leimmittel direkt (ohne Leitungsführung) von dem Leimmittelspeichertank in den Leimmittelzufuhrtank abgelassen werden.Preferably, the glue supply system comprises a glue storage tank in which sizing agent is storable to feed the sizing agent from the sizing agent storage tank into the common glue supply means. This glue store may be switchable to the glue supply system or may be stationarily connected to the feed tank. The sizing agent storage tank may be a mobile unit that may be used with various glue supply systems in a paper mill to deliver sizing agents to the respective supply tanks of the various glue delivery systems if the glue consumption in the respective glue delivery systems has exceeded a predetermined value. The sizing agent storage tank is preferably arranged such that the sizing agent can be fed from the sizing agent storage tank to the supply tank. This can be done with a separate conduit to the supply tank or the sizing agent can be drained directly (without conduit) from the sizing agent storage tank into the sizing agent supply tank.

Als zuzuführendes Leimmittel kann Leimmittel, pigmentfreies Leimmittel, pigmenthaltiges Leimmittel, pigmentfreies oder pigmenthaltiges Farbmittel verwendet werden. Somit kann das Leimmittelzuführsystem zum Zuführen von pigmenthaltigen Mitteln zu den Leimmittelauftrageeinrichtungen verwendet werden, um die Bahnseite(n) der Papier- oder Kartonbahn zu pigmentieren (z.B. zur Herstellung von Vorstrichen, zur Verbesserung der Qualität von oberflächengeleimten Papier, etc.). Der in den Ansprüchen verwendete Begriff "Leimmittel" umfasst: Mittel für die Leimung (Leimmittel), Mittel für die Pigmentierung (z.B. ein Leimmittel mit Bindemittel und Pigmenten) sowie Farbmittel für die Farbgebung. Für die Veredlung der Oberfläche können Füllstoffe oder Füllpigmente verwendet werden, wobei pigmentiertes Leimmittel auch gefärbt sein kann.As the sizing agent to be supplied, sizing agent, pigment-free sizing agent, pigment-containing sizing agent, pigment-free or pigment-containing coloring agent may be used become. Thus, the sizing agent delivery system may be used to deliver pigment-containing agents to the sizing agent applicators to pigment the web side (s) of the paper or board web (eg, to make precursors, improve the quality of surface sized paper, etc.). The term "sizing agent" as used in the claims comprises: sizing agents (sizing agents), agents for pigmentation (eg a sizing agent with binder and pigments) and colorants for coloring. For the refinement of the surface fillers or filler pigments may be used, wherein pigmented sizing agent may also be colored.

In Hinblick auf den Trockengehalt und die Viskosität des Leimmittels kann beim Aufbringen von Leimmittel durch Filmtransferleimmittelauftragseinheiten ein Leimmittel bevorzugt mit einem Trockengehalt von 5 - 16% und einer Viskosität von 20 - 60mPas Brookfield 100U/min verwendet werden. Beim Verwenden von pigmenthaltigem Leimmittel ist der Trockengehalt des Leimmittels bevorzugt 10 - 45% und beträgt die Viskosität bevorzugt 20 - 600mPas Brookfield 100U/min.In view of the dry content and the sizing agent viscosity, when sizing agents are applied by film transfer coating application units, a sizing agent preferably having a dry content of 5-16% and a viscosity of 20-60 mPas Brookfield 100 rpm can be used. When using pigment-containing sizing agent, the dry content of the sizing agent is preferably 10-45% and the viscosity is preferably 20-600 mPas Brookfield 100 U / min.

Das erfindungsgemäße Leimmittelzufuhrsystem wird bevorzugt bei einer Leimpresse in einer Trockenpartie in einer Papier- oder Kartonherstellungsmaschine verwendet, um die Eigenschaften und die Qualität der Papiers- oder Kartonbahn (z.B. Benetzungs- und/oder Eindringverhalten) bei der Papier- oder Kartonherstellung nach den gewünschten Vorgaben des Papiers/Kartons (Trockengehalt, Leimungsgrad, etc.) einzustellen.The sizing agent supply system according to the invention is preferably used in a size press in a dryer section in a paper or board making machine to determine the properties and quality of the paper or board web (eg wetting and / or penetration behavior) during paper or board production according to the desired specifications of the paper or board Paper / cardboard boxes (dry content, degree of sizing, etc.).

Das erfindungsgemäße Leimmittelzufuhrsystem ist nachstehend anhand des in der einzigen Figur gezeigten Ausführungsbeispiels näher erläutert.The sizing agent supply system according to the invention is explained below with reference to the embodiment shown in the single figure.

Fig. 1 zeigt schematisch einen entsprechenden Aufbau des erfindungsgemäßen Leimmittelzufuhrsystems. Fig. 1 schematically shows a corresponding structure of the sizing agent supply system according to the invention.

In Fig. 1 weist das erfindungsgemäße Leimmittelzufuhrsystem einen Zufuhrtank 1, eine Zentrifugalpumpe (Pumpe) 2, zwei Siebe (Siebeinrichtung) 3, einen unteren Leimmittelauftragsbalken (Leimmittelauftrageeinrichtung) 4, einen oberen Leimmittelauftragsbalken (Leimmittelauftrageeinrichtung) 5 und einen Leimmittelspeichertank 6 auf.In Fig. 1 For example, the glue supply system of the present invention has a supply tank 1, a centrifugal pump 2, two screens 3, a bottom glue application bar 4, an upper one Glue application bar (glue applicator) 5 and a Leimmittelspeichertank 6 on.

Der Zufuhrtank 1, die Pumpe 2 und die Siebeinrichtung 3 bilden eine gemeinsame Leimmittelzufuhreinrichtung. Somit bilden gemäß dem vorliegenden Ausführungsbeispiel der Zufuhrtank 1, die Pumpe 2 und die beiden Siebe 3 die gemeinsame Leimmittelzufuhreinrichtung, durch die das Leimmittel den beiden Leimmittelauftragsbalken 4, 5 zuführbar ist.The feed tank 1, the pump 2 and the screening device 3 form a common glue supply device. Thus, according to the present embodiment, the supply tank 1, the pump 2 and the two wires 3, the common glue supply means by which the glue means the two glue application bar 4, 5 can be fed.

Die beiden Leimmittelauftragsbalken 4, 5 sind zu entsprechenden Bahnseiten einer mit dem Leimmittel zu versehenen Papier- oder Kartonbahn (nicht gezeigt) zugeordnet. Das heißt, der untere Leimmittelauftragsbalken 4 ist zu einer unteren Bahnseite (z.B. Rückseite) der Papier- oder Kartonbahn zugeordnet, während der obere Leimmittelauftragsbalken 5 zu der oberen Bahnseite (z.B. Vorderseite) der Papier- oder Kartonbahn zugeordnet ist, so dass der untere Leimmittelauftragsbalken 4 geeignet ist, das Leimmittel auf die Rückseite der Papier- oder Kartonbahn aufzubringen, während der obere Leimmittelauftragsbalken 5 das Leimmittel auf die Vorderseite der Papier- oder Kartonbahn aufbringen kann.The two glue coating application bars 4, 5 are assigned to corresponding web sides of a paper or board web (not shown) to be provided with the glue means. That is, the lower glue application bar 4 is assigned to a lower sheet side (eg, back side) of the paper or board web, while the upper glue coating bar 5 is assigned to the upper sheet side (eg, front side) of the paper or board web, so that the lower glue coating bar 4 is adapted to apply the sizing agent on the back of the paper or board web, while the upper sizing bar 5 can apply the sizing agent to the front of the paper or board web.

Ferner weist das erfindungsgemäße Leimmittelzufuhrsystem eine gemeinsame Leimmittelzufuhrleitung 11, eine gemeinsame Leimmittelzufuhrverbindungsleitung (Leimmittelzufuhrleitung) 12 und eine gemeinsame Leimmittelrückfuhrleitung 13 auf.Further, the sizing agent delivery system of the present invention includes a sizing glue delivery conduit 11, a glue glue delivery conduit (sizing agent delivery conduit) 12 and a glue sizer return conduit 13.

Der Zufuhrtank 1 ist mittels der Leimmittelzufuhrleitung 11 mit der Pumpe 2 verbunden, wobei stromabwärtig der Pumpe 2, die zwei Filter 3 in Parallelschaltung in der Leimmittelzufuhrleitung 11 angeordnet sind. Die Leimmittelzufuhrleitung 11 wird stromabwärtig der Filter 3 wieder zusammengeführt und geht in die Leimmittelzufuhrverbindungsleitung 12 über, die mit beiden Leimmittelauftragsbalken 4 und 5 verbunden ist.The feed tank 1 is connected to the pump 2 by the glue supply line 11, and downstream of the pump 2, the two filters 3 are arranged in parallel in the glue supply line 11. The glue supply line 11 is recombined downstream of the filters 3 and passes into the glue supply connection line 12 which is connected to both glue application bars 4 and 5.

Überschüssiges Leimmittel, das nicht zur Leimung der beiden Bahnseiten der Papier- oder Kartonbahn verwendet wird, ist über die gemeinsame Rückfuhrleitung 13 stromabwärtig von den beiden Leimmittelauftragsbalken 4 und 5 zu dem Zufuhrtank 1 rückführbar.Excess sizing agent which is not used for sizing the two web sides of the paper or board web is via the common return line 13 traceable downstream of the two glue applicator bars 4 and 5 to the feed tank 1.

Der Leimmittelspeichertank 6 ist in dem vorliegenden Ausführungsbeispiel stationär über eine Leimmittelspeichertankleitung, die stromaufwärtig des Zufuhrtanks 1 in die Rückfuhrleitung 13 mündet, mit dem Zufuhrtank 1 verbunden.The sizing agent storage tank 6 in the present embodiment is connected to the feed tank 1 in a stationary manner via a sizing agent storage tank line which opens into the return line 13 upstream of the feed tank 1.

Der Leimmittelspeichertank 6 kann auch mit einer separaten Leimmittelspeichertankleitung mit dem Zufuhrtank 1 verbunden sein. Ferner kann der Leimmittelspeichertank 6 über eine Öffnung des Zufuhrtanks 1 gebracht werden, um das Leimmittel, das in dem Leimmittelspeichertank 6 gespeichert ist, in den Zufuhrtank 1 abzulassen. Ferner kann der Leimmittelspeichertank 6 auch anhand einer Leitungskopplung direkt oder über die Rückfuhrleitung 13 zu dem Zufuhrtank 1 zuschaltbar sein, um Leimmittel von dem Leimmittelspeichertank 6 zu dem Zufuhrtank 1 zuzuführen.The sizing agent storage tank 6 can also be connected to the supply tank 1 with a separate sizing agent storage tank line. Further, the sizing agent storage tank 6 may be brought over an opening of the supply tank 1 to discharge the sizing agent stored in the sizing agent storage tank 6 into the supply tank 1. Furthermore, the sizing agent storage tank 6 can also be connectable to the supply tank 1 directly by means of a line coupling or via the return line 13 in order to supply sizing agent from the sizing agent storage tank 6 to the supply tank 1.

Obwohl es in der Figur nicht dargestellt ist, kann eine Drosseleinrichtung (Drosselventil, einstellbare Drossel, oder dergleichen) zwischen der Pumpe 2 und den Leimmittelauftragsbalken 4, 5 in der Leimmittelzufuhreinrichtung vorgesehen sein. Bevorzugt ist eine derartige Drosseleinrichtung stromabwärtig der Pumpe 2 und stromaufwärtig der Filter 3 in der Leimmittelzufuhrleitung 11 angeordnet. Somit kann durch die Drosseleinrichtung ein Durchfluss und/oder Zufuhrdruck des Leimmittels zu den Leimmittelauftragsbalken 4,5 eingestellt werden.Although not shown in the figure, throttling means (throttle valve, adjustable throttle, or the like) may be provided between the pump 2 and the glue-applying bars 4, 5 in the glue supply means. Preferably, such a throttle device is arranged downstream of the pump 2 and upstream of the filter 3 in the glue supply line 11. Thus, through the throttle device, a flow and / or supply pressure of the sizing agent can be adjusted to the glue application bar 4.5.

Da die Pumpe 2 eine Zentrifugalpumpe ist, können durch eine entsprechende Drehzahlregelung oder durch eine entsprechende Regelung der Durchflussmenge des Leimmittels durch die Zentrifugalpumpe hindurch die Pumpenverluste zur Erwärmung (Temperatur) des Leimmittels dienen, z.B. kann das Leimmittel auf eine derartige Temperatur erwärmt werden (z.B. 85°C), die zur Leimung der Bahnseiten der Papier- oder Kartonbahn besonders vorteilhaft ist.Since the pump 2 is a centrifugal pump, by a corresponding speed control or by a corresponding regulation of the flow rate of the sizing agent through the centrifugal pump, the pump losses for heating (temperature) of the sizing agent can be used, e.g. For example, the sizing agent may be heated to a temperature (e.g., 85 ° C) which is particularly advantageous for sizing the web sides of the paper or board web.

Gemäß dem erfindungsgemäßen Leimmittelzufuhrsystem wird das Leimmittel durch den Pumpenbetrieb der Pumpe 2 von dem Zufuhrtank 1 angesaugt, dadurch das Leimmittel zu den Sieben 3 zugeführt, in diesen entsprechend gefiltert und gereinigt, danach wieder in die gemeinsame Zufuhrleitung 11 zusammengeführt und zu den beiden Leimmittelauftragsbalken 4, 5 über die Leimmittelzufuhrverbindungsleitung 12 zugeführt. Überschüssiges Leimmittel, das bei der Leimung der beiden Bahnseiten der Papier- oder Kartonbahn nicht verwendet wird, ist über die gemeinsame Rückfuhrleitung 13 zu dem Zufuhrtank 1 rückführbar. Optional bzw. alternativ kann in der gemeinsamen Rückfuhrleitung 13 auch eine entsprechende Siebeinrichtung (z.B. die zwei Siebe, die in der Leimmittelzufuhrleitung 11 angeordnet sind) angeordnet sein, um das überschüssige Leimmittel vor der Rückführung in den Zufuhrtank 1 entsprechend reinigen zu können.According to the sizing agent supply system according to the invention, the sizing agent is sucked by the pumping operation of the pump 2 from the supply tank 1, thereby supplying the sizing agent to the sieves 3, filtered in this accordingly and cleaned, then merged again into the common supply line 11 and fed to the two glue application bar 4, 5 via the glue supply connection line 12. Excess sizing agent, which is not used in the sizing of the two web sides of the paper or board web, is traceable via the common return line 13 to the feed tank 1. Optionally or alternatively, in the common return line 13 and a corresponding screening device (eg, the two screens, which are arranged in the glue supply line 11) may be arranged to clean the excess sizing agent before returning to the feed tank 1 accordingly.

Bevorzugt werden als die Siebe 3 dieselben Siebe verwendet, die in den Leimmittelzufuhrsystemen gemäß dem Stand der Technik verwendet werden. Somit können die entsprechenden Lagerbestände an Sieben herangezogen werden, ohne dass neue Siebbaugrößen verwendet werden.Preferably, the sieves 3 used are the same sieves used in the glue delivery systems of the prior art. Thus, the corresponding stocks of sieves can be used without new sieve sizes are used.

In dem vorstehenden Ausführungsbeispiel sind zwei Leimmittelauftragsbalken vorgesehen. Es können auch mehr als zwei Leimmittelauftragsbalken als Leimmittelauftrageeinrichtungen vorgesehen sein, sofern diese mit der gemeinsamen Leimmittelzufuhreinrichtung verbunden sind, durch die das Leimmittel zu ihnen zuführbar ist.In the above embodiment, two glue coating bars are provided. It is also possible to provide more than two glue application bars as glue application devices, provided that these are connected to the common glue supply device, through which the glue can be supplied to them.

In dem vorstehenden Ausführungsbeispiel sind Leimmittelauftragsbalken als Leimmittelauftrageeinrichtungen vorgesehen. Es können auch Filmtransferleimmittelauftragseinheiten und/oder Leimmittelpressen verwendet werden. Ferner können beliebige Kombinationen von Leimmittelauftragsbalken, Filmtransferleimmittelauftragseinheiten und/oder Leimmittelpressen als Leimmittelauftrageeinrichtungen angewandt werden, zu denen das Leimmittel über die gemeinsamen Leimmittelzufuhreinrichtung zugeführt wird.In the above embodiment, sizing agent application bars are provided as sizing agent applicators. Film transfer glue application units and / or glue presses may also be used. Further, any combination of size coat bars, film size coaters, and / or size presses may be used as size applicators to which the size agent is delivered via the common size feeder.

In dem vorstehenden Ausführungsbeispiel ist der untere Leimmittelauftragsbalken zu der Rückseite (untere Bahnseite) der Papier- oder Kartonbahn zugeordnet, während der obere Leimmittelauftragsbalken zu der Vorderseite (obere Bahnseite) der Papier- oder Kartonbahn zugeordnet ist. Diese können auch zu ein und derselben Bahnseite zugeordnet sein. Ferner sind die Bezeichnungen "oben" und "unten" nicht einschränkend auszulegen, sie dienen lediglich zur Unterscheidung der beiden Bahnseiten der Papier- oder Kartonbahn. Z.B. kann auch eine vertikale oder geneigte Bahnführung der Papier- oder Kartonbahn in einer Leimpresse verwendet werden, so dass eine "linke" Bahnseite und eine "rechte" Bahnseite mit dem Leimmittel versehen werden können.In the above embodiment, the bottom glue application bar is associated with the back (bottom web side) of the paper or board web, while the top glue bar is associated with the front (upper web side) of the paper or board web. These can also be too be assigned to one and the same web page. Furthermore, the terms "top" and "bottom" are not restrictive interpret, they are only used to distinguish the two web pages of paper or board web. For example, a vertical or inclined web guide of the paper or board web can be used in a size press, so that a "left" web page and a "right" web page can be provided with the sizing agent.

Es kann auch ein Sieb oder mehr als zwei Siebe in der Zuführleitung und/oder in der Rückführleitung zur Reinigung des Leimmittels verwendet werden. Zudem können die Siebe in Serie geschaltet in dem Leimmittelzufuhrsystem angeordnet sein. Auch eine Kombination von Serie- und Parallelschaltung der Siebe ist möglich. Ferner kann die Zuführleitung zwei oder mehr parallel durchflossene Siebe haben. Es können auch Siebe hintereinander geschaltet sein, die ggf. als Siebkaskade mit in Durchflussrichtung abnehmender Maschenweite (feinere Siebe) gestaltet sein können.It is also possible to use one sieve or more than two sieves in the feed line and / or in the return line for cleaning the sizing agent. In addition, the screens may be arranged in series in the glue supply system. A combination of series and parallel connection of the sieves is possible. Furthermore, the supply line may have two or more screens in parallel. It can also be connected in series, which may be designed as Siebkaskade with decreasing in the flow direction mesh size (finer sieves) and sieves.

Der Begriff "Leimmittel" umfasst alle für die Leimung von Papier geeigneten Leimmittel; diese können pigmenthaltig oder pigmentfrei, füllstoffhaltig oder füllstofffrei, gefärbt oder ungefärbt sowie ggf. mit weiteren Zusatzstoffen versehen sein.The term "sizing agent" includes all sizing agents suitable for sizing paper; these may be pigment-containing or pigment-free, containing or free of fillers, dyed or undyed and optionally provided with further additives.

Bei der Verwendung von pigmenthaltigen Mitteln können die Bahnseite(n) der Papier- oder Kartonbahn mittels den Leimmittelauftrageeinrichtungen (korrespondieren zu Farbmittelauftrageeinrichtungen oder Füllstoffmittelauftrageeinrichtungen) entsprechend pigmentiert werden (z.B. zur Herstellung von Vorstrichen, zur Verbesserung der Qualität von oberflächengeleimten Papier, etc.).With the use of pigment-containing agents, the web side (s) of the paper or board web may be appropriately pigmented by means of the sizing application means (corresponding to colorant applicators or filler applicators) (e.g., for the preparation of precursors, to improve the quality of surface sized paper, etc.).

Claims (15)

Leimmittelzufuhrsystem, vorzugsweise für eine Maschine zum Bearbeiten von einer Papier- oder Kartonbahn, zum Zuführen von Leimmittel zu einer Papier-oder Kartonbahn, mit zumindest zwei Leimmittelauftrageeinrichtungen (4, 5) zum Auftragen des Leimmittels auf die Papier- oder Kartonbahn, die mit einer gemeinsamen Leimmittelzufuhreinrichtung (1, 2, 3) verbunden sind, durch die das Leimmittel den Leimmittelauftrageeinrichtungen (4, 5) zuführbar ist.Glue feed system, preferably for a machine for processing a paper or board web, for supplying sizing agent to a paper or board web, comprising at least two sizing means (4, 5) for applying sizing agent to the paper or board web associated with a common web Leimmittelzufuhreinrichtung (1, 2, 3) are connected, by which the sizing agent is the Leimmittelauftrageeinrichtungen (4, 5) can be fed. Leimmittelzufuhrsystem nach Anspruch 1, wobei die Leimmittelzufuhreinrichtung (1, 2, 3) eine Zentrifugalpumpe (2) zum Pumpen des Leimmittels zu den Leimmittelauftrageeinrichtungen (4, 5) aufweist.A glue supply system according to claim 1, wherein the glue supply means (1, 2, 3) comprises a centrifugal pump (2) for pumping the glue means to the glue applying means (4, 5). Leimmittelzufuhrsystem nach Anspruch 1 oder 2, wobei die Leimmittelzufuhreinrichtung (1, 2, 3) einen Zufuhrtank (1), in dem das Leimmittel aufnehmbar ist, und zumindest eine Siebeinrichtung (3) aufweist, durch die das von dem Zufuhrtank (1) durch die Zentrifugalpumpe (2) zu den Leimmittelauftrageeinrichtungen (4, 5) zugeführte Leimmittel gesiebt und gereinigt wird.A glue supply system according to claim 1 or 2, wherein the glue supply means (1, 2, 3) comprises a supply tank (1) in which the sizing agent is receivable, and at least one sifting means (3) through which the supply tank (1) passes through Centrifugal pump (2) to the glue applying means (4, 5) supplied sizing agent is screened and cleaned. Leimmittelzufuhrsystem nach Anspruch 3, wobei die Siebeinrichtung (3) zumindest zwei Siebe (3) aufweist, die in einer mit den Leimmittelauftrageeinrichtungen (4, 5) verbundenen Leimmittelzufuhrleitung (11) in Parallelschaltung angeordnet sind.A glue delivery system according to claim 3, wherein the screening device (3) comprises at least two screens (3) arranged in parallel in a glue supply line (11) connected to the glue application devices (4, 5). Leimmittelzufuhrsystem nach einem der vorangegangenen Ansprüche, wobei die Leimmittelauftrageeinrichtungen (4, 5) und die gemeinsame Leimmittelzufuhreinrichtung (1, 2, 3) über eine gemeinsame Leimmittelzufuhrleitung (12), über die das Leimmittel den Leimmittelauftrageeinrichtungen (4, 5) zuführbar ist, und eine gemeinsame Rückfuhrleitung (13), über die überschüssiges Leimmittel zu der Leimmittelzufuhreinrichtung (1, 2, 3) rückführbar ist, miteinander verbunden sind.A sizing agent delivery system according to any one of the preceding claims, wherein the sizing agent applicators (4, 5) and co-glue delivery means (1, 2, 3) are communicated via a sizing glue delivery conduit (12) through which the sizing agent is deliverable to sizing agent applicators (4, 5) common return line (13) over which excess glue to the glue supply means (1, 2, 3) is traceable, connected to each other. Leimmittelzufuhrsystem nach Anspruch 5, wobei die Rückfuhrleitung (13) die Leimmittelauftrageeinrichtungen (4, 5) und den Zufuhrtank (1) miteinander verbindet und in der das überschüssige Leimmittel zu dem Zufuhrtank (1) rückführbar ist.The sizing agent delivery system of claim 5, wherein the return line (13) interconnects the sizing agent applicators (4, 5) and the feed tank (1) and in which the excess sizing agent is traceable to the feed tank (1). Leimmittelzufuhrsystem nach Anspruch 5 oder 6, wobei in der Rückfuhrleitung (13) zumindest eine Siebeinrichtung vorgesehen ist, um das überschüssige Leimmittel durchzusieben und zu reinigen.Glucose delivery system according to claim 5 or 6, wherein in the return line (13) at least one screening device is provided to durchzusieben and clean the excess sizing agent. Leimmittelzufuhrsystem nach Anspruch 7, wobei die Siebeinrichtung zumindest zwei Siebe aufweist, die in der Rückfuhrleitung (13) in Parallelschaltung angeordnet sind.Glue agent delivery system according to claim 7, wherein the screening device has at least two screens, which are arranged in the return line (13) in parallel. Leimmittelzufuhrsystem nach einem der Ansprüche 2 bis 8, wobei eine Drosseleinrichtung zwischen der Zentrifugalpumpe (2) und den Leimmittelauftrageeinrichtungen (4, 5) in der Leimmittelzufuhreinrichtung (1, 2, 3) vorgesehen ist.A glue supply system according to any one of claims 2 to 8, wherein a throttle means is provided between the centrifugal pump (2) and the glue applying means (4, 5) in the glue supply means (1, 2, 3). Leimmittelzufuhrsystem nach einem der vorangegangenen Ansprüche, wobei die Leimmittelauftrageeinrichtungen (4, 5) Filmtransferleimmittelauftragseinheiten, Leimmittelauftragsbalken und/oder Leimmittelpressen sind.A sizing agent delivery system according to any one of the preceding claims, wherein the sizing agent applicators (4,5) are film transfer agent application units, sizing agent application bars and / or sizing agent compressors. Leimmittelzufuhrsystem nach einem der vorangegangenen Ansprüche, wobei die Leimmittelauftrageeinrichtungen (4, 5) derart angeordnet sind, dass das Leimmittel auf beide Bahnseiten der Papier- oder Kartonbahn aufbringbar ist.Glimmittelzufuhrsystem according to any one of the preceding claims, wherein the glue applying means (4, 5) are arranged such that the sizing agent can be applied to both web sides of the paper or board web. Leimmittelzufuhrsystem nach einem der vorangegangenen Ansprüche, das des Weiteren einen Leimmittelspeichertank (6) aufweist, in dem Leimmittel speicherbar ist, um das Leimmittel von dem Leimmittelspeichertank (6) in die gemeinsame Leimmittelzufuhreinrichtung (1, 2, 3) einzuspeisen.A glue supply system according to any one of the preceding claims, further comprising a glue storage tank (6) in which sizing agent is storable to feed the sizing agent from the glue glue storage tank (6) into the glue glue supply means (1, 2, 3). Leimmittelzufuhrsystem nach Anspruch 12, wobei der Leimmittelspeichertank (6) derart angeordnet ist, dass Leimmittel von dem Leimmittelspeichertank (6) zu dem Zufuhrtank (1) einspeisbar ist.Glimmittelzufuhrsystem according to claim 12, wherein the glue storage tank (6) is arranged such that sizing agent from the sizing agent storage tank (6) to the feed tank (1) can be fed. Leimmittelzufuhrsystem nach einem der vorangegangenen Ansprüche, wobei das zuzuführende Leimmittel ein pigmenthaltiges oder pigmentfreies, füllstoffhaltiges oder füllstofffreies, gefärbtes oder ungefärbtes Leimmittel mit oder ohne Zusatzstoffe ist.The sizing agent delivery system of any one of the preceding claims, wherein the sizing agent to be delivered comprises a pigmented or pigment-free, filler-containing sizing agent or filler-free, colored or uncolored sizing agent with or without additives. Verwendung des Leimmittelzufuhrsystems nach einem der vorangegangenen Ansprüche mit einer Leimpresse in einer Trockenpartie in einer Papier- oder Kartonherstellungsmaschine.Use of the glue supply system according to any one of the preceding claims with a size press in a dryer section in a paper or board making machine.
EP20110195307 2011-01-13 2011-12-22 Gluing agent supply system for feeding gluing agent to a sheet of paper or cardboard Active EP2476806B1 (en)

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