EP0977662A1 - Heating device for a corrugated cardboard production unit - Google Patents

Heating device for a corrugated cardboard production unit

Info

Publication number
EP0977662A1
EP0977662A1 EP98928085A EP98928085A EP0977662A1 EP 0977662 A1 EP0977662 A1 EP 0977662A1 EP 98928085 A EP98928085 A EP 98928085A EP 98928085 A EP98928085 A EP 98928085A EP 0977662 A1 EP0977662 A1 EP 0977662A1
Authority
EP
European Patent Office
Prior art keywords
corrugated cardboard
heating device
metal strip
cardboard web
web
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
EP98928085A
Other languages
German (de)
French (fr)
Other versions
EP0977662B1 (en
Inventor
Edmund Bradatsch
Andreas Knorr
Hans Mosburger
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.)
BHS Corrugated Maschinen und Anlagenbau GmbH
Original Assignee
BHS Corrugated Maschinen und Anlagenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BHS Corrugated Maschinen und Anlagenbau GmbH filed Critical BHS Corrugated Maschinen und Anlagenbau GmbH
Publication of EP0977662A1 publication Critical patent/EP0977662A1/en
Application granted granted Critical
Publication of EP0977662B1 publication Critical patent/EP0977662B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/2877—Pressing means for bringing facer sheet and corrugated webs into contact or keeping them in contact, e.g. rolls, belts
    • B31F1/2881—Pressing means for bringing facer sheet and corrugated webs into contact or keeping them in contact, e.g. rolls, belts for bringing a second facer sheet into contact with an already single faced corrugated web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/285—Heating or drying equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/105—Drying webs by contact with heated surfaces other than rollers or drums
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/18—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact
    • F26B3/20—Drying solid materials or objects by processes involving the application of heat by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact the heat source being a heated surface, e.g. a moving belt or conveyor

Definitions

  • the invention relates to a heating device for a corrugated cardboard system with the features of the preamble of claim 1.
  • Heating devices for a corrugated cardboard plant are known. These so-called heating sections have several heating plates arranged in the direction of travel of the corrugated cardboard web, which are usually heated by means of superheated steam. The top of these heating plates form a flat, smooth heating surface. The corrugated cardboard web runs at a constant speed over this heating surface. It is pressed onto the heating surface by means of a driven endless belt and pressing devices in the form of mechanical pressing rollers or pneumatic pressure hoods. The pressure device and / or the temperature of the heating surface depends on factors such as Running speed of the corrugated cardboard web, moisture values and the like, controllable. It can be provided in the corrugated cardboard plant or separately from this train section. The disadvantage is that the temperature of the heating plates cannot be changed quickly.
  • the temperature of the heating plates cannot be adapted to rapid changes in the speed and nature of the continuous corrugated cardboard web.
  • the quality of the corrugated board web can also be impaired.
  • a heating device for a corrugated cardboard system in which a conveyor belt is made of a textile or plastic fabric or felt above the heating plates, the conveyor belt being directly heated to increase the heat supply. Due to the material selection of the conveyor belt, this device can only a relatively constant temperature of the belt can be achieved. However, since the aim of the measure of heating the conveyor belt was to eliminate negative influences due to the penetration of moisture that escape from the corrugated cardboard into the belt, or to prevent heat being removed from the corrugated cardboard by the conveyor belt, this fact did not matter.
  • the object of the invention is to provide a heating device for a corrugated cardboard system in which the quality of the outgoing corrugated cardboard is as constant as possible even in the event of rapid or sudden changes in the process parameters or the parameters of the incoming corrugated cardboard web, in particular its moisture Corrugated cardboard is guaranteed.
  • the heating device has a heated metal strip running at the speed of the corrugated cardboard web largely prevents friction between the band and the corrugated cardboard web.
  • the necessary conveying capacity for the corrugated cardboard web is reduced.
  • the heated metal strip has a low mass, the temperature of which can be changed quickly. A faster adaptation to the conditions and conditions of the corrugated cardboard web, such as, for example, the moisture, speed or the like, is thus possible.
  • the heated metal strip is preferably a steel strip. This is particularly low-wear and can withstand the corresponding tensile and stretching forces.
  • the metal strip is vapor-permeable.
  • the metal strip can be designed as a perforated strip, a woven strip or the like. The metal strip covering the corrugated cardboard web in this way allows the moisture to escape from the corrugated cardboard web or the glue application to the outside.
  • the metal strip can be heated in different ways, e.g. by steam, hot gas, hot liquid, an infrared source, an induction source or a high frequency source.
  • the heating source can also form a pressing device of the metal strip against the corrugated cardboard web.
  • two heatable metal strips are used which act on the top and bottom of the corrugated cardboard web. This has the advantage that no sliding friction occurs between the corrugated cardboard web and the heating devices, and curvature of the web is largely avoided by uneven heating of the top and bottom web. Furthermore, the static friction between the belts and the web enables the belts to function simultaneously as a means of transport.
  • Figure 1 is a schematic side view of a first embodiment of a heating device according to the invention for a corrugated cardboard system.
  • FIG. 2 shows a plan view of part of the metal strip in the form of a perforated strip
  • Fig. 3 is a plan view of part of a metal strip in the form of a web and
  • Fig. 4 shows a further embodiment of a heating device according to the invention with two metal strips.
  • the heating device 1 has a stand 2, which can support heating plates 3 arranged one behind the other in a lying position.
  • the upper side of the heating plates 3 forms a flat, smooth heating surface 4.
  • the heating plates 3 can be divided transversely to the running direction of the corrugated cardboard web 5.
  • the heating plates 3 can be heated by any heating means, for example steam, gas, electrical heating means or the like.
  • the temperature of the heating surface can be set to a predetermined temperature value.
  • the temperature value can be predetermined in the longitudinal or transverse direction of the running direction of the corrugated cardboard web 5. It is also possible to control these temperature values depending on the speed of the movement of the corrugated cardboard web 5.
  • the heating plate temperature can also be controlled via measuring sensors, depending on the humidity of the corrugated cardboard web 5 or the amount of glue applied to the Corrugated cardboard web 5 take place, possibly in the form of a closed control loop.
  • the corrugated cardboard web 5 which moves over the heating surface 4 and lies against it, runs towards the heating surface at the inlet end 6 and ends at the outlet end 7. It moves in the direction indicated by arrow I.
  • Adjacent to the top of the corrugated cardboard web 5 is an endless metal strip 10 which rotates in the direction of the arrow II indicated.
  • the corrugated cardboard web 5 can move in the indicated conveying direction or at least be moved at the speed of the web in order to avoid the effects of friction.
  • the metal strip 10 can be driven on the outlet side by a drive motor 11 via a drive roller 12.
  • the metal strip 10 runs over a deflection roller 13. Both rollers 12, 13 must have a relatively large diameter in order not to adversely affect the service life of the metal strip.
  • the metal strip 10 is preferably a steel strip. As can be seen in FIG. 2, this can also be provided with holes 30. Moisture vapor can be drawn off from the corrugated cardboard web 5 through the metal strip 10 via these holes 30. The moisture vapor comes from the corrugated cardboard web 5 itself or from the applied glue.
  • the metal strip 10 can also consist of spun fibers 31 which run in the longitudinal direction and are mutually twisted. This creates gussets for the moisture vapor between the fibers of metal, preferably steel.
  • the metal strip 10 is preferably driven at the speed of movement of the corrugated cardboard web 5. Hereby there is no friction between the belt 10 and the corrugated cardboard web 5.
  • the belt 10 can simultaneously act as a conveyor belt or at least support the conveying of the corrugated cardboard web 5.
  • heat is introduced into the corrugated cardboard web 5 from below via the heating plates 3 and from above via the metal strip 10. Due to the low thermal capacity of the metal strip 10, the temperature of the metal strip can be quickly adjusted and thus the amount of heat transferred to the corrugated cardboard web 5 can be quickly adapted to the circumstances, in particular the moisture of the corrugated cardboard web. By rapidly changing the amount of heat that can be transferred from the metal strip to the web, it is possible to control or regulate the moisture balance between the upper and lower layers of the web.
  • the heating device can also be designed such that the metal strip 10 acts on the underside of the corrugated cardboard web 5. This has the advantage that if the web 5 tears, the metal strip does not drag over the heating plates 3 as soon as the pressure means are released.
  • the heating plates 3 of conventional design could also be replaced by other heating plates and by other known electrical induction plates or the like.
  • These pressing devices 17 can be of a mechanical type, for example, as known, formed by lifting and lowering pressing rollers or pneumatically by pressure hoods. The pressing devices 17 determine the thermal energy transferred to the corrugated cardboard web 5.
  • the pressing devices 17 can also be formed by housings which are heated by superheated steam or hot gas.
  • heating sources not shown, e.g. Provide infrared sources, induction sources or high-frequency sources for the metal strip 10.
  • Such heat sources can be provided at any point on the metal strip, in particular also on the strand that does not act on the corrugated cardboard web 5.
  • the incoming single-sided corrugated cardboard 20 and / or cover sheet 21 and / or the outgoing corrugated cardboard sheet 22 are associated with sensors 23, 24 or 25.
  • the pressing devices 17 can be controlled via a control device (not shown) depending on the temperature or humidity values measured by the measuring sensors with regard to the pressing value. If the measured values exceed a predetermined value, the pressure values of the pressure devices 17 are reduced and vice versa.
  • such a complex mechanical solution can also be dispensed with if the temperature of the metal strip is controlled or regulated depending on the signals from the sensors 23, 24, 25.
  • the temperature or humidity of the incoming webs can also be influenced by using a known preheater with a heating drum, the temperature or the web wrap angle of which is controlled.
  • a vacuum source in order to remove the moisture vapor from the interior of the corrugated cardboard, can be attached to at least one side edge of the corrugated cardboard web 5.
  • FIG. 4 shows a second embodiment of the heating device according to the invention, in which 5 metal strips 10 are provided above and below the corrugated cardboard web to be heated.
  • This has the advantage that between the surfaces to be heated, i.e. the outer surfaces of the heated metal strips 5, and the web of corrugated cardboard to be heated does not generate any friction. This prevents the individual sheets of corrugated cardboard from shifting during the drying process. This in turn creates a warp-free corrugated cardboard that can be stacked to save space and easily processed.
  • the two circumferential metal strips 10 and the components interacting therewith are basically the same as the metal strip of the embodiment according to FIG. 1. In this respect, reference can be made to the above explanations.
  • the dreams of the metal strips 10 adjacent to the corrugated cardboard web 5 are each acted upon in the direction of the corrugated cardboard web by pressure chambers 30, the medium of the pressure chambers, preferably steam or hot gas, at the same time the amount of heat required for heating the web 5 and the pressure of the metal bands 10 against the Lane 5 delivers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)

Abstract

The invention relates to a heating device for a corrugated cardboard production unit, having at least one heating element on one side of a continuous corrugated paper web and a conveyor unit for the corrugated cardboard web. The heating element consists of a heated metal strip (10) turning at the same speed as the corrugated cardboard web (5).

Description

Heizvorrichtung für eine Wellpappenanlage Heating device for a corrugated cardboard system
Die Erfindung betrifft eine Heizvorrichtung für eine Wellpappenanlage mit den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a heating device for a corrugated cardboard system with the features of the preamble of claim 1.
Es sind Heizvorrichtungen für eine Wellpappenanlage bekannt. Diese sogenannten Heizpartien besitzen mehrere in Laufrichtung der Wellpappenbahn angeordnete Heizplatten, die meist mittels Heißdampf beheizt werden. Diese Heizplatten bilden mit ihrer Oberseite eine ebene, glatte Heizfläche. Über diese Heizfläche läuft die Wellpappenbahn mit kontinuierlicher Geschwindigkeit. Sie wird über einen angetriebenen Endlosgurt und Andrückvorrichtungen in Form von mechanischen Andrückwalzen oder pneuma- tischen Druckhauben an die Heizfläche angedrückt. Die Andrückvorrichtung und/oder die Temperatur der Heizfläche ist abhängig von Faktoren, wie z.B. Laufgeschwindigkeit der Wellpappenbahn, Feuchtigkeitswerte und dergleichen, steuerbar. Es können in der Wellpappenanlage oder getrennt von dieser Zug- partien vorgesehen sein. Nachteilig ist, dass die Temperatur der Heizplatten nicht rasch veränderbar ist. Eine Anpassung der Temperatur der Heizplatten an rasche Änderungen der Geschwindigkeit und Beschaffenheit der durchlaufenden Wellpappenbahn kann sonst nicht erfolgen. Außerdem besteht zwischen durchlaufender Wellpappenbahn und stationären Heizplatten eine hohe Reibung. Hierdurch wird die Förderleistung für die Wellpappenbahn unnötig erhöht. Auch können sich Beeinträchtigungen der Qualität der Wellpappenbahn ergeben.Heating devices for a corrugated cardboard plant are known. These so-called heating sections have several heating plates arranged in the direction of travel of the corrugated cardboard web, which are usually heated by means of superheated steam. The top of these heating plates form a flat, smooth heating surface. The corrugated cardboard web runs at a constant speed over this heating surface. It is pressed onto the heating surface by means of a driven endless belt and pressing devices in the form of mechanical pressing rollers or pneumatic pressure hoods. The pressure device and / or the temperature of the heating surface depends on factors such as Running speed of the corrugated cardboard web, moisture values and the like, controllable. It can be provided in the corrugated cardboard plant or separately from this train section. The disadvantage is that the temperature of the heating plates cannot be changed quickly. Otherwise, the temperature of the heating plates cannot be adapted to rapid changes in the speed and nature of the continuous corrugated cardboard web. There is also high friction between the continuous corrugated cardboard web and stationary heating plates. This unnecessarily increases the conveying capacity for the corrugated board web. The quality of the corrugated board web can also be impaired.
Aus der DE 44 37 557 AI der Anmelderin ist eine Heizvorrichtung für eine Wellpappenanlage bekannt, bei der oberhalb der Heizplatten ein Transportband aus einem Textil- oder Kunststoffgewebe oder aus Filz besteht, wobei das Transportband zur Erhöhung der Wärmezufuhr direkt beheizbar ist. Durch die Mate- rialwahl des Transportbands kann bei dieser Vorrichtung jedoch nur eine relativ konstante Temperatur des Bandes erreicht werden. Da Ziel der Maßnahme des Beheizens des Transportbandes das Beseitigen negativer Einflüsse durch Eindringen von Feuchtigkeit, die aus der Wellpappe in das Band entweicht, war bzw. zu verhindern, dass der Wellpappe durch das Transportband Wärme entzogen wird, spielte diese Tatsache jedoch keine Rolle. Treten jedoch schnelle Änderungen in der Feuchtigkeit der Wellpappenbahn auf bzw. erfolgen rasche Änderungen der Prozessparameter oder der Parameter der zu beheizenden Bahn, so ist es erforderlich, entsprechend schnelle Änderungen in der zugeführten Wärmemenge zu erzeugen, um eine konstante Feuchtigkeit bzw. Qualität der auslaufenden Wellpappenbahn zu gewährleisten.From DE 44 37 557 AI of the applicant, a heating device for a corrugated cardboard system is known, in which a conveyor belt is made of a textile or plastic fabric or felt above the heating plates, the conveyor belt being directly heated to increase the heat supply. Due to the material selection of the conveyor belt, this device can only a relatively constant temperature of the belt can be achieved. However, since the aim of the measure of heating the conveyor belt was to eliminate negative influences due to the penetration of moisture that escape from the corrugated cardboard into the belt, or to prevent heat being removed from the corrugated cardboard by the conveyor belt, this fact did not matter. However, if there are rapid changes in the moisture of the corrugated cardboard web or rapid changes in the process parameters or the parameters of the web to be heated, it is necessary to generate correspondingly rapid changes in the amount of heat supplied in order to maintain a constant moisture level or quality of the outflowing corrugated cardboard web to ensure.
Ausgehend von dem vorstehend skizzierten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine HeizVorrichtung für eine Wellpappenanlage zu schaffen, bei der auch bei raschen oder plötzlichen Änderungen der Prozessparameter oder der Parameter der einlaufenden Wellpappenbahn, insbesondere deren Feuchtigkeit, eine möglichst konstante Qualität der auslaufenden Wellpappenbahn gewährleistet ist.On the basis of the prior art outlined above, the object of the invention is to provide a heating device for a corrugated cardboard system in which the quality of the outgoing corrugated cardboard is as constant as possible even in the event of rapid or sudden changes in the process parameters or the parameters of the incoming corrugated cardboard web, in particular its moisture Corrugated cardboard is guaranteed.
Die Erfindung löst diese Aufgabe mit den Merkmalen des Patentanspruchs 1.The invention solves this problem with the features of claim 1.
Dadurch, dass die HeizVorrichtung ein mit der Geschwindigkeit der Wellpappenbahn umlaufendes, beheiztes Metallband aufweist, wird weitgehendst eine Reibung zwischen dem Band und der Wellpappenbahn vermieden. Die notwendige Förderleistung für die Wellpappenbahn wird vermindert. Außerdem besitzt das beheizte Metallband eine geringe Masse, deren Temperatur rasch veränderbar ist. Es ist somit eine schnellere Anpassung an die Verhältnisse und Bedingungen der Wellpappenbahn, wie z.B. die Feuchtigkeit, Geschwindigkeit oder dergleichen möglich. Vorzugsweise ist nach einer Ausgestaltung der Erfindung das beheizte Metallband ein Stahlband. Ein solches ist besonders verschleißarm und kann den entsprechenden Zug- und Streckkräften widerstehen.The fact that the heating device has a heated metal strip running at the speed of the corrugated cardboard web largely prevents friction between the band and the corrugated cardboard web. The necessary conveying capacity for the corrugated cardboard web is reduced. In addition, the heated metal strip has a low mass, the temperature of which can be changed quickly. A faster adaptation to the conditions and conditions of the corrugated cardboard web, such as, for example, the moisture, speed or the like, is thus possible. According to one embodiment of the invention, the heated metal strip is preferably a steel strip. This is particularly low-wear and can withstand the corresponding tensile and stretching forces.
Nach einer weiteren Ausgestaltung ist das Metallband dampfdurchlässig. Hierzu kann das Metallband als Lochband, Gespinstband oder dergleichen ausgebildet sein. Das die Wellpappenbahn abdeckende Metallband erlaubt es auf diese Weise, dass die Feuchtigkeit aus der Wellpappenbahn oder dem Leimauftrag nach außen entweichen kann.According to a further embodiment, the metal strip is vapor-permeable. For this purpose, the metal strip can be designed as a perforated strip, a woven strip or the like. The metal strip covering the corrugated cardboard web in this way allows the moisture to escape from the corrugated cardboard web or the glue application to the outside.
Das Metallband kann nach einer Ausgestaltung der Erfindung auf unterschiedliche Weise erhitzt werden, z.B. durch Dampf, Heiß- gas, Heißflüssigkeit, eine Infrarotquelle, eine Induktionsquelle oder eine Hochfrequenzquelle.According to an embodiment of the invention, the metal strip can be heated in different ways, e.g. by steam, hot gas, hot liquid, an infrared source, an induction source or a high frequency source.
Nach einer Ausgestaltung der Erfindung kann die Erhitzungsquelle zugleich eine Andrückvorrichtung des Metallbandes an die Wellpappenbahn bilden.According to one embodiment of the invention, the heating source can also form a pressing device of the metal strip against the corrugated cardboard web.
Bei der bevorzugten Ausführungsform der Erfindung finden zwei beheizbare Metallbänder Verwendung, die die Wellpappenbahn an ihrer Ober- bzw. Unterseite beaufschlagen. Hierdurch ergibt sich der Vorteil, dass zwischen der Wellpappenbahn und den Heizeinrichtungen keinerlei Gleitreibung auftritt und eine Krümmung der Bahn durch eine ungleichmäßige Beheizung von Ober- und Unterbahn weitgehend vermieden wird. Des Weiteren ermöglicht die Haftreibung zwischen den Bändern und der Bahn die gleichzeitige Funktion der Bänder als Transportmittel.In the preferred embodiment of the invention, two heatable metal strips are used which act on the top and bottom of the corrugated cardboard web. This has the advantage that no sliding friction occurs between the corrugated cardboard web and the heating devices, and curvature of the web is largely avoided by uneven heating of the top and bottom web. Furthermore, the static friction between the belts and the web enables the belts to function simultaneously as a means of transport.
Weitere Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen. Die Erfindung wird nachfolgend anhand von in der Zeichnung dargestellten Ausführungsbeispielen näher erläutert. In der Zeichnung zeigen:Further embodiments of the invention result from the subclaims. The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing. The drawing shows:
Fig. 1 eine schematische Seitenansicht einer ersten Ausführungsform einer erfindungsgemäßen Heizvorrichtung für eine Wellpappenanlage;Figure 1 is a schematic side view of a first embodiment of a heating device according to the invention for a corrugated cardboard system.
Fig. 2 eine Draufsicht eines Teils des Metallbandes in Form eines Lochbandes;2 shows a plan view of part of the metal strip in the form of a perforated strip;
Fig. 3 eine Draufsicht eines Teils eines Metallbandes in Form eines Gespinstbandes undFig. 3 is a plan view of part of a metal strip in the form of a web and
Fig. 4 eine weitere Ausführungsform einer Heizvorrichtung nach der Erfindung mit zwei Metallbändern.Fig. 4 shows a further embodiment of a heating device according to the invention with two metal strips.
Die HeizVorrichtung 1 weist wie üblich einen Ständer 2 auf, der liegend hintereinander angeordnete Heizplatten 3 tragen kann. Die Heizplatten 3 bilden mit ihrer Oberseite eine ebene, glatte Heizfläche 4.As usual, the heating device 1 has a stand 2, which can support heating plates 3 arranged one behind the other in a lying position. The upper side of the heating plates 3 forms a flat, smooth heating surface 4.
Quer zur Laufrichtung der Wellpappenbahn 5 können die Heizplatten 3 unterteilt sein.The heating plates 3 can be divided transversely to the running direction of the corrugated cardboard web 5.
Die Heizplatten 3 können durch beliebige Heizmittel, z.B. Dampf, Gas, elektrische Heizmittel oder dergleichen erhitzt werden. Die Temperatur der Heizfläche kann auf einen vorbestimmten Temperaturwert eingestellt werden. Der Temperaturwert kann in Längs- oder Querrichtung der Laufrichtung der Wellpappenbahn 5 vorgegeben sein. Es ist auch möglich, diese Temperaturwerte abhängig von der Geschwindigkeit der Bewegung der Wellpappenbahn 5 zu steuern. Die Steuerung der Heizplattentemperatur kann auch über Messfühler, abhängig von der Feuchtig- keit der Wellpappenbahn 5 bzw. der Leimauftragsmenge auf die Wellpappenbahn 5 erfolgen, ggf. in Form einer geschlossenen Regelschleife.The heating plates 3 can be heated by any heating means, for example steam, gas, electrical heating means or the like. The temperature of the heating surface can be set to a predetermined temperature value. The temperature value can be predetermined in the longitudinal or transverse direction of the running direction of the corrugated cardboard web 5. It is also possible to control these temperature values depending on the speed of the movement of the corrugated cardboard web 5. The heating plate temperature can also be controlled via measuring sensors, depending on the humidity of the corrugated cardboard web 5 or the amount of glue applied to the Corrugated cardboard web 5 take place, possibly in the form of a closed control loop.
Die über die Heizfläche 4 sich bewegende und an dieser anlie- gende Wellpappenbahn 5 läuft am Einlaufende 6 der Heizfläche zu und am Auslaufende 7 aus. Sie bewegt sich in der angegebenen Pfeilrichtung I.The corrugated cardboard web 5, which moves over the heating surface 4 and lies against it, runs towards the heating surface at the inlet end 6 and ends at the outlet end 7. It moves in the direction indicated by arrow I.
An der Oberseite der Wellpappenbahn 5 anliegend läuft ein endloses Metallband 10, das in der angegebenen Pfeilrichtung II umläuft. Es kann die Wellpappenbahn 5 in der angegebenen Förderrichtung bewegen oder zumindest mit der Geschwindigkeit der Bahn mitbewegt werden, um Reibungseinflüsse zu vermeiden. Das Metallband 10 kann, wie in Fig. 1 dargestellt, auslaufsei- tig durch einen Antriebsmotor 11 über eine Antriebswalze 12 angetrieben werden. Einlaufseitig läuft das Metallband 10 über eine Umlenkwalze 13. Beide Walzen 12 , 13 müssen einen relativ großen Durchmesser aufweisen, um die Lebensdauer des Metallbandes nicht nachteilig zu beeinflussen.Adjacent to the top of the corrugated cardboard web 5 is an endless metal strip 10 which rotates in the direction of the arrow II indicated. The corrugated cardboard web 5 can move in the indicated conveying direction or at least be moved at the speed of the web in order to avoid the effects of friction. As shown in FIG. 1, the metal strip 10 can be driven on the outlet side by a drive motor 11 via a drive roller 12. On the inlet side, the metal strip 10 runs over a deflection roller 13. Both rollers 12, 13 must have a relatively large diameter in order not to adversely affect the service life of the metal strip.
Das Metallband 10 ist vorzugsweise ein Stahlband. Dies kann auch wie in Fig. 2 ersichtlich mit Löchern 30 versehen sein. Über diese Löcher 30 kann Feuchtigkeitsdampf aus der Wellpappenbahn 5 durch das Metallband 10 abziehen. Der Feuchtigkeits- dampf rührt von der Wellpappenbahn 5 selbst her oder aber von dem aufgebrachten Leim.The metal strip 10 is preferably a steel strip. As can be seen in FIG. 2, this can also be provided with holes 30. Moisture vapor can be drawn off from the corrugated cardboard web 5 through the metal strip 10 via these holes 30. The moisture vapor comes from the corrugated cardboard web 5 itself or from the applied glue.
Das Metallband 10 kann auch, wie aus Fig. 3 ersichtlich, aus Gespinstfasern 31 bestehen, die in Längsrichtung verlaufen und gegenseitig verwunden sind. Es entstehen dabei zwischen den Fasern aus Metall, vorzugsweise Stahl, Durchtrittszwickel für den Feuchtigkeitsdampf .As can be seen from FIG. 3, the metal strip 10 can also consist of spun fibers 31 which run in the longitudinal direction and are mutually twisted. This creates gussets for the moisture vapor between the fibers of metal, preferably steel.
Das Metallband 10 wird vorzugsweise mit der Bewegungsge- schwindigkeit der Wellpappenbahn 5 angetrieben. Hierdurch ergibt sich keine Reibung zwischen Band 10 und der Wellpappenbahn 5. Das Band 10 kann gleichzeitig als Förderband wirken bzw. das Fördern der Wellpappenbahn 5 zumindest unterstützen.The metal strip 10 is preferably driven at the speed of movement of the corrugated cardboard web 5. Hereby there is no friction between the belt 10 and the corrugated cardboard web 5. The belt 10 can simultaneously act as a conveyor belt or at least support the conveying of the corrugated cardboard web 5.
In dem in Fig. 1 dargestellten Ausführungsbeispiel wird Wärme über die Heizplatten 3 von unten und über das Metallband 10 von oben in die Wellpappenbahn 5 eingebracht. Durch die geringe Wärmekapazität des Metallbands 10 kann eine schnelle Anpassung der Temperatur des Metallbands und damit eine schnelle Anpassung der auf die Wellpappenbahn 5 übertragenen Wärmemenge an die Gegebenheiten, insbesondere an die Feuchtigkeit der Wellpappenbahn erfolgen. Durch rasche Veränderbarkeit der von dem Metallband auf die Bahn übertragbare Wärmemenge wird eine Steuerung bzw. Regelung des Feuchtigkeitsausgleichs zwischen oberen und unteren Schichten der Bahn ermöglicht.In the exemplary embodiment shown in FIG. 1, heat is introduced into the corrugated cardboard web 5 from below via the heating plates 3 and from above via the metal strip 10. Due to the low thermal capacity of the metal strip 10, the temperature of the metal strip can be quickly adjusted and thus the amount of heat transferred to the corrugated cardboard web 5 can be quickly adapted to the circumstances, in particular the moisture of the corrugated cardboard web. By rapidly changing the amount of heat that can be transferred from the metal strip to the web, it is possible to control or regulate the moisture balance between the upper and lower layers of the web.
Es wäre auch möglich, als Wärmequelle lediglich ein einziges Metallband 10 auf einer Seite der Wellpappenbahn 5 zu verwenden. Die Heizplatten 3 sind durch eine ebene Abstützflache zu ersetzen.It would also be possible to use only a single metal strip 10 on one side of the corrugated cardboard web 5 as the heat source. The heating plates 3 are to be replaced by a flat support surface.
Die HeizVorrichtung kann auch so ausgebildet sein, dass das Metallband 10 die Unterseite der Wellpappenbahn 5 beaufschlagt. Hierdurch ergibt sich der Vorteil, dass bei einem Reißen der Bahn 5 das Metallband nicht über die Heizplatten 3 schleift, sobald die Andruckmittel gelöst werden.The heating device can also be designed such that the metal strip 10 acts on the underside of the corrugated cardboard web 5. This has the advantage that if the web 5 tears, the metal strip does not drag over the heating plates 3 as soon as the pressure means are released.
Schließlich ist es auch möglich, oberhalb und unterhalb der Wellpappenbahn beheizte Metallbänder 10 einzusetzen. Eine derartige Ausführungsform der Erfindung ist in der unten beschriebenen Fig. 4 dargestellt.Finally, it is also possible to use heated metal strips 10 above and below the corrugated cardboard web. Such an embodiment of the invention is shown in FIG. 4 described below.
Selbstverständlich könnten die Heizplatten 3 üblicher Bauart auch durch andere Heizplatten und durch andere bekannte elek- trische Induktionsplatten oder dergleichen ersetzt werden. Überhalb des unteren Trumes 16 des Endlosbandes 10 befinden sich ein oder mehrere Andrückvorrichtungen 17, die das untere Trum des Endlosbandes 10 gegen die Oberseite der Wellpappenbahn 5 drücken. Diese Andrückvorrichtungen 17 können mechani- scher Art, z.B. wie bekannt, durch heb- und senkbare Andrückwalzen oder aber pneumatisch durch Druckhauben gebildet sein. Die AndrückVorrichtungen 17 bestimmen die übertragene Wärmeenergie auf die Wellpappenbahn 5.Of course, the heating plates 3 of conventional design could also be replaced by other heating plates and by other known electrical induction plates or the like. Above the lower strand 16 of the endless belt 10 there are one or more pressing devices 17 which press the lower strand of the endless belt 10 against the top of the corrugated cardboard web 5. These pressing devices 17 can be of a mechanical type, for example, as known, formed by lifting and lowering pressing rollers or pneumatically by pressure hoods. The pressing devices 17 determine the thermal energy transferred to the corrugated cardboard web 5.
Die Andrückvorrichtungen 17 können auch von Gehäusen gebildet sein, die durch Heißdampf oder heißes Gas beheizt werden.The pressing devices 17 can also be formed by housings which are heated by superheated steam or hot gas.
Es wäre auch möglich, ein oder mehrere, nicht dargestellte Erhitzungsquellen, z.B. Infrarotquellen, Induktionsquellen oder Hochfrequenzquellen für das Metallband 10 vorzusehen. Derart beschaffene Heizquellen können an jeder beliebigen Stelle des Metallbands vorgesehen sein, insbesondere auch an dem nicht die Wellpappenbahn 5 beaufschlagenden Trum.It would also be possible to use one or more heating sources, not shown, e.g. Provide infrared sources, induction sources or high-frequency sources for the metal strip 10. Such heat sources can be provided at any point on the metal strip, in particular also on the strand that does not act on the corrugated cardboard web 5.
Der zulaufenden einseitigen Wellpappe 20 und/oder Deckbahn 21 und/oder der auslaufenden Wellpappenbahn 22 sind Messfühler 23, 24 oder 25 zugeordnet. Über eine nicht dargestellte Steuereinrichtung können die Andrückvorrichtungen 17 abhängig von den durch die Messfühler gemessenen Temperatur- bzw. Feuchtig- keitswerte hinsichtlich des Anpresswertes gesteuert werden. Überschreiten die gemessenen Werte einen vorbestimmten Wert, werden die Andrückwerte der Andrückvorrichtungen 17 erniedrigt und umgekehrt.The incoming single-sided corrugated cardboard 20 and / or cover sheet 21 and / or the outgoing corrugated cardboard sheet 22 are associated with sensors 23, 24 or 25. The pressing devices 17 can be controlled via a control device (not shown) depending on the temperature or humidity values measured by the measuring sensors with regard to the pressing value. If the measured values exceed a predetermined value, the pressure values of the pressure devices 17 are reduced and vice versa.
Jedoch kann durch die Verwendung des schnell reagierenden Heizsystems in Form des beheizten Metallbands 5 auch auf eine solche aufwendige mechanische Lösung verzichtet werden, wenn die Temperatur des Metallbands abhängig von den Signalen der Messfühler 23, 24, 25 gesteuert bzw. geregelt wird. Zusätzlich kann auch die Temperatur bzw. Feuchtigkeit der zulaufenden Bahnen beeinflusst werden, indem ein bekannter Vorheizer mit Heiztrommel verwendet ist, dessen Temperatur bzw. die Bahnumschlingungswinkel gesteuert wird.However, by using the fast-reacting heating system in the form of the heated metal strip 5, such a complex mechanical solution can also be dispensed with if the temperature of the metal strip is controlled or regulated depending on the signals from the sensors 23, 24, 25. In addition, the temperature or humidity of the incoming webs can also be influenced by using a known preheater with a heating drum, the temperature or the web wrap angle of which is controlled.
Um den Feuchtigkeitsdampf aus dem Wellpappeninnneren zu entfernen, kann an wenigstens einem Seitenrand der Wellpappenbahn 5 in nicht dargestellter Weise eine Vakuumquelle, wie an sich bekannt, angebracht werden.In order to remove the moisture vapor from the interior of the corrugated cardboard, a vacuum source, as is known per se, can be attached to at least one side edge of the corrugated cardboard web 5.
Fig. 4 zeigt eine zweite Ausführungsform der erfindungsgemäßen HeizVorrichtung, bei der oberhalb und unterhalb der zu beheizenden Wellpappenbahn 5 Metallbänder 10 vorgesehen sind. Hierdurch ergibt sich der Vorteil, dass zwischen den wärmezufüh- renden Flächen, d.h. den Außenflächen der beheizten Metallbänder 5, und der zu beheizenden Wellpappenbahn keinerlei Reibung erzeugt wird. Damit wird ein Verschieben der einzelnen Bahnen der Wellpappe während des Trockenvorgangs vermieden. Hierdurch wird wiederum eine verzugsfreie Wellpappe erzeugt, die platzsparend gestapelt und problemlos weiterverarbeitet werden kann.4 shows a second embodiment of the heating device according to the invention, in which 5 metal strips 10 are provided above and below the corrugated cardboard web to be heated. This has the advantage that between the surfaces to be heated, i.e. the outer surfaces of the heated metal strips 5, and the web of corrugated cardboard to be heated does not generate any friction. This prevents the individual sheets of corrugated cardboard from shifting during the drying process. This in turn creates a warp-free corrugated cardboard that can be stacked to save space and easily processed.
Die beiden umlaufenden Metallbänder 10 bzw. die damit zusammenwirkenden Komponenten sind grundsätzlich ebenso beschaffen, wie das Metallband der Ausfuhrungsform gemäß Fig. 1. Insofern kann auf die vorstehenden Ausführungen verwiesen werden.The two circumferential metal strips 10 and the components interacting therewith are basically the same as the metal strip of the embodiment according to FIG. 1. In this respect, reference can be made to the above explanations.
Die der Wellpappenbahn 5 benachbarten Trume der Metallbänder 10 werden jeweils in Richtung auf die Wellpappenbahn von Druckkammern 30 beaufschlagt, wobei das Medium der Druckkammern, vorzugsweise Dampf oder Heißgas, gleichzeitig die für das Beheizen der Bahn 5 erforderliche Wärmemenge und den Andruck der Metallbänder 10 an die Bahn 5 liefert. The dreams of the metal strips 10 adjacent to the corrugated cardboard web 5 are each acted upon in the direction of the corrugated cardboard web by pressure chambers 30, the medium of the pressure chambers, preferably steam or hot gas, at the same time the amount of heat required for heating the web 5 and the pressure of the metal bands 10 against the Lane 5 delivers.

Claims

Heizvorrichtung für eine WellpappenanlagePatentansprüche Heating device for a corrugated cardboard plant
Heizvorrichtung für eine Wellpappenanlage mit mindestens einer Heizeinrichtung auf einer Seite einer fortlaufenden Wellpappenbahn und einer Fördereinrichtung für die Wellpappenbahn,Heating device for a corrugated cardboard plant with at least one heating device on one side of a continuous corrugated cardboard web and a conveying device for the corrugated cardboard web,
dadurch gekennzeichnet.characterized.
dass die Heizeinrichtung als ein mit der Geschwindigkeit der Wellpappenbahn (5) umlaufendes beheiztes Metallband (10) ausgebildet ist.that the heating device is designed as a heated metal strip (10) rotating at the speed of the corrugated cardboard web (5).
2. Heizvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das beheizte Metallband (10) ein dünnes Stahlband ist.2. Heating device according to claim 1, characterized in that the heated metal strip (10) is a thin steel strip.
3. Heizvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Metallband (10) dampfdurchlässig als Lochband oder Gespinstband ausgebildet ist.3. Heating device according to claim 1 or 2, characterized in that the metal strip (10) is designed to be vapor-permeable as a perforated strip or woven strip.
4. Heizvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Metallband (10) durch ein mit Dampf, Heißgas oder4. Heating device according to claim 1, characterized in that the metal strip (10) by a with steam, hot gas or
Heißflüssigkeit beheiztes Gehäuse beaufschlagt ist.Hot liquid heated housing is acted on.
5. Heizvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das mit Dampf, Heißgas oder Heißflüs- sigkeit beheizte Gehäuse eine Umlenkwalze (13) für das Metallband (10) ist.5. Heating device according to one of claims 1 to 4, characterized in that the heated with steam, hot gas or hot liquid housing is a deflection roller (13) for the metal strip (10).
6. Heizvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das mit Dampf, Heißgas oder Heißflüs- sigkeit beheizte Gehäuse als Andrückvorrichtung (17, 30) des Metallbandes (10) an die Wellpappenbahn (5) ausgebildet ist.6. Heating device according to one of claims 1 to 4, characterized in that with steam, hot gas or hot liquid. liquid heated housing as a pressing device (17, 30) of the metal strip (10) on the corrugated cardboard web (5) is formed.
7. HeizVorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Metallband (10) durch eine Infrarotquelle, eine Induktionsquelle oder eine Hochfrequenzquelle erhitzt ist.7. Heating device according to one of claims 1 to 4, characterized in that the metal strip (10) is heated by an infrared source, an induction source or a high-frequency source.
8. Heizvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Wellpappenbahn (5) quer zu ihrer Förderrichtung an einem Rand an eine Vakuumquelle angeschlossen ist.8. Heating device according to one of the preceding claims, characterized in that the corrugated cardboard web (5) is connected transversely to its conveying direction at one edge to a vacuum source.
9. Heizvorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwei die Ober- und Unterseite der Wellpappenbahn (5) beaufschlagende Metallbänder (10) vorgesehen sind. 9. Heating device according to one of the preceding claims, characterized in that two metal strips (10) acting on the top and bottom of the corrugated cardboard web (5) are provided.
EP98928085A 1997-04-21 1998-03-27 Heating device for a corrugated cardboard production unit Expired - Lifetime EP0977662B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19716716A DE19716716C2 (en) 1997-04-21 1997-04-21 Heating device for a corrugated cardboard system
DE19716716 1997-04-21
PCT/DE1998/000896 WO1998047700A1 (en) 1997-04-21 1998-03-27 Heating device for a corrugated cardboard production unit

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EP0977662A1 true EP0977662A1 (en) 2000-02-09
EP0977662B1 EP0977662B1 (en) 2002-06-19

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JP (1) JP2001523175A (en)
DE (2) DE19716716C2 (en)
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DE19954754A1 (en) * 1999-11-15 2001-05-17 Bhs Corr Masch & Anlagenbau Heater for a corrugated cardboard machine
US7654296B2 (en) * 2003-11-24 2010-02-02 Albany International Corp. Grooved single facer belt
KR101932968B1 (en) * 2018-07-06 2019-03-15 이병길 Apparatus for manufacturing corrugated cardboard fish box

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DE2123200A1 (en) * 1971-03-25 1972-09-28
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WO1998047700A1 (en) 1998-10-29
DE19716716A1 (en) 1998-10-22
EP0977662B1 (en) 2002-06-19
JP2001523175A (en) 2001-11-20
DE59804520D1 (en) 2002-07-25
DE19716716C2 (en) 2002-04-18

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