EP1101599A1 - Heating device for a corrugating machine - Google Patents

Heating device for a corrugating machine Download PDF

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Publication number
EP1101599A1
EP1101599A1 EP00123952A EP00123952A EP1101599A1 EP 1101599 A1 EP1101599 A1 EP 1101599A1 EP 00123952 A EP00123952 A EP 00123952A EP 00123952 A EP00123952 A EP 00123952A EP 1101599 A1 EP1101599 A1 EP 1101599A1
Authority
EP
European Patent Office
Prior art keywords
heating device
conveyor belt
steam
upper conveyor
transport direction
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.)
Withdrawn
Application number
EP00123952A
Other languages
German (de)
French (fr)
Inventor
Thomas Hecky
Lothar Jobst
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 EP1101599A1 publication Critical patent/EP1101599A1/en
Withdrawn legal-status Critical Current

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    • 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
    • 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

Definitions

  • the invention relates to a heating device for a corrugated cardboard machine according to the preamble of claim 1.
  • the invention has for its object a heating device for corrugated cardboard machines To provide in the most uniform and flat pressing of the corrugated cardboard web with effective discharge of the water vapor generated is possible.
  • the task is characterized by the features of the characterizing part of the claim 1 solved.
  • the essence of the invention is that the top conveyor belt with steam inlet and steam outlet openings and between them there is a free volume in the form of a vapor buffer is provided.
  • a heater 1 has a table 4 supported against the floor 2 by feet 3 the top of which is adjacent to one another along a transport direction 5 6 heated plates 7 are arranged via heating elements.
  • an endless upper conveyor belt 8 is provided, which via deflection or drive rollers 9 is guided in a circle such that its Lower strand 10 parallel to the plates 7, delimiting a channel 11 is transportable in transport direction 5.
  • the table 4 against Transport direction 5 is upstream of the deflection of the upper conveyor belt 8 serving deflection roller 12 and an arranged below it counter-roller 14 forming an inlet nip 13.
  • corrugated cardboard sheet 18 fed. It is of course possible to use corrugated cardboard other construction such. B. only from a one-sided corrugated cardboard and a cover sheet to use.
  • the corrugated cardboard web 18 is along the transport direction 5 through the channel 11 between the lower strand 10 and the plates 7 transported. Above the plates 7 and the lower strand 10, numerous pressing elements 19 are provided, which are adjacent to each other in the transport direction, each with formation of a gap 20 and offset from one another. The pressure elements 19 press the lower strand 10 flat against the corrugated cardboard web 18th
  • Each pressing element 19, one of which is shown enlarged in FIG. 2 has a bearing 21 connected to a machine frame the underside of which is attached to a laterally projecting intermediate plate 22.
  • a laterally encompassing the intermediate plate 22 in the manner of a shoe Pressure plate 23 is resilient with respect to the bearing 21 by compression springs 24 biased.
  • the pressure plate 23 has one on its underside level pressing surface 25 extending in the transport direction 5.
  • the pressure plate 23 has a length of 200 in the transport direction 5 to 600 mm, with the gap 20 in the transport direction 5 a width of about 20 mm.
  • Edge area 26 of the pressure plate 23 are adjustable stop pins 27 provided the maximum displacement of the intermediate plate 22nd limit relative to the bearing 21.
  • the pressure plate 23 is vertical can be flexibly deflected to the transport direction 5.
  • the pressure element 19 lies on the corrugated cardboard web 18 with its own weight.
  • a more precise one Description of the structure of the heater 1 and in particular the structure of the pressing elements 19 is from DE 198 11 858 A1 (corresponds to US Ser.No. 09/271 230), to which reference is hereby made.
  • the upper conveyor belt 8 which is shown enlarged in FIGS. 3 and 4 has a base surface 28 formed in the form of longitudinal slots Inlet openings 29 and a top surface 30 with corresponding Exit openings 31. Between the inlet openings 29 and Outlet openings 31 are connected to these, transversely to the transport direction 5 extending, essentially a rectangular cross section having steam channels 32 provided.
  • the free volume in volume 8 serves as a steam buffer.
  • the upper conveyor belt 8 points across to the transport direction 5 extending cross members 33 on the shape have a flattened, helical spiral, the Helix formed by a helical wire 34 with a circular cross section becomes.
  • Cross members 33 are connected to one another in the manner of a hinge, the helical paths of adjacent cross members 33 alternately interlocking and by one running transversely to the transport direction Cross bar 35 are interconnected.
  • the cross bar 35 alternately from the spiral wire 34 of the left of this in Fig. 3 and the right of which cross member 33 is wrapped.
  • the Steam channel 32 is through that of the spiral wire 34 of each Cross member 33 formed space.
  • the helical wires 34 and cross bars 35 are made of plastic, in particular polyester, polyamide or polyethylene. However, it is also possible to use metallic alloys and especially steel. According to the present embodiment, the spiral wire 34 has a diameter of 1.2 mm and the cross bars have a diameter of 1.05 mm.
  • the thickness D of the band 8 is 3.7 mm.
  • the width B of the channels 32 is approximately 7 mm.
  • the height H of the channels is approximately 1.3 mm. It is of course possible to change the dimensioning of the band 8 and in particular to use a finer structure.
  • the outer contour of the band 8 is delimited by the base surface 28, the top surface 30 and two side surfaces 36, which enclose an outer contour volume V A.
  • the inlet openings 29, outlet openings 31 and steam channels 32 that is to say the cavities of the strip 8 which form the steam intermediate stores and which are not filled by the helical wires 34 and cross bars 35, have a steam absorption volume V overall D on.
  • the ratio V D to V A is 0.95 ⁇ V D / V A 0,1 0.15, in particular 0.85 V V D / V A 0,3 0.3 and particularly advantageously 0.75 V V D / V A. 0.45.
  • Approximately V D / V A ⁇ 0.6 applies to the band 8 dimensioned as before.
  • the inlet openings 29 or outlet openings 31, which have the shape of longitudinal slots, run obliquely to the transport direction 5 and form an angle a with the transport direction, for which 0.5 ° a a applies ⁇ 20 ° and in particular 2 ° ⁇ a ⁇ 10 °.
  • the following is the operation of the heater 1 and in particular that of the upper conveyor belt 8 described.
  • the incoming glued corrugated cardboard layers 15, 16 and the cover sheet 17 are in the inlet gap 13 merged.
  • the corrugated cardboard web 18 is then over the plates 7 of the table 4 transported, the heated plates 7, the normally have a temperature of 180 ° C, the corrugated web 18 heat to a temperature of approximately 90 ° C - 130 ° C in order to Glue contained water to evaporate at least partially.
  • the pressure elements 19 exercise a uniform pressing force on the conveyor belt 8 on the corrugated web 18 to ensure that it holds well Bonding occurs.
  • the upper conveyor belt 8, the lower strand 10 is in contact with the corrugated cardboard web 18, transports the corrugated cardboard web 18 with in the transport direction 5.
  • FIG. 5 A second embodiment will now be described with reference to FIG. 5 described the invention. Identical parts are given the same reference symbols as in the first embodiment, based on the description thereof is hereby referred. Structurally different, but functional Similar parts are given the same reference symbols with a superscript Dash.
  • the main difference from the first embodiment consists in the construction of the upper conveyor belt 8 '. This points along its two edge regions 37 one connected to the band 8 ' Support band 38 which protrudes from the band 8 'in the direction of the plate 7.
  • the support band 38 is made of a temperature-resistant material, in particular Polytetrafluoroethylene or polyamide made. It is also possible, to generate the support band 38 in that the edge region 37 with a is soaked in temperature-resistant resin, which in the form of Support band 38 protrudes from the band 8 '.
  • the tape 8 'according the second embodiment is used when the width W is Corrugated cardboard web 18 is smaller than the width of the upper conveyor belt 8 ', so that this hang down on the plates 7 and by their comparative high temperature could be damaged.
  • FIG. 6 A third embodiment will now be described with reference to FIG. 6 described the invention. Identical parts are given the same reference symbols as in the first embodiment, based on the description thereof is hereby referred. Structurally different, but functional Similar parts are given the same reference numerals with two superscripts Strokes.
  • the difference compared to the second shown in Figure 5 Embodiment is that at the edge regions 37 of the tape 8 supporting wedges 39 are provided, which are connected via a spindle 40 and a motor 41 can be moved transversely to the transport direction 5, whereby the overhanging upper conveyor belt 8 is supported. Hereby it is prevented that this with the heated plates 7 directly in Contact comes.
  • a fourth embodiment will now be described with reference to FIG. 7 described the invention.
  • Identical parts are given the same reference symbols as in the first embodiment, based on the description thereof is hereby referred. Structurally different, but functional Similar parts are given the same reference numerals with three superscripts Strokes.
  • the main difference from the first embodiment consists in the construction of the pressure element 19 "'.
  • the pressure plate 23 "' is via sleeves 42 which are spring-loaded in the intermediate plate 22"' screwed to the intermediate plate 22 "', so that this pressure plate 23 "'is movable relative to the intermediate plate 22"'.
  • In the pressure plate 23 "'bores 43 are provided towards the pressing surface 25, which via a channel 44 running transversely thereto with suction connections 45 are connected. This makes it possible, in addition to the removal of the steam emerging from the corrugated cardboard web 18 through the upper conveyor belt 8 the steam through the outlet openings 31, the bores 43, vacuum the channel 44 and the suction connections 45. Hereby the removal of the steam is further improved.

Abstract

The heater comprises a bench with at least one heatable plate above which is a continuous upper conveyor belt (8) movable in one transport direction (5). A duct is defined by the at least one plate and the upper conveyor belt for guiding the web of corrugated paper. Pressure plates press the upper conveyor belt against the web of corrugated paper and form a gap . The side of the upper conveyor belt next to the plate have free inlets (29) for the steam emerging from the corrugated paper web. The side next to the pressure plates has free outlets (31) for discharging steam. An intermediate steam-accumulator is between the inlets and outlets.

Description

Die Erfindung betrifft eine Heizvorrichtung für eine Wellpappemaschine gemäß dem Oberbegriff des Anspruches 1.The invention relates to a heating device for a corrugated cardboard machine according to the preamble of claim 1.

Aus der DE 198 11 858 A1 (entspricht US Ser.No. 9/271 230) ist eine gattungsgemäße Heizvorrichtung für eine Wellpappemaschine bekannt. Vorteilhaft an der dort beschriebenen Vorrichtung ist, daß eine möglichst flächige und gleichmäßige Druckaufbringung auf die Wellpappebahn zu deren Verklebung möglich ist. Nachteilig ist, daß der infolge der Erwärmung aus der Wellpappe austretende Wasserdampf nicht gut entweichen kann, da die von oben auf der Wellpappe aufliegenden Andrück-Platten dies verhindern.DE 198 11 858 A1 (corresponds to US Ser.No. 9/271 230) is a generic one Heating device for a corrugated cardboard machine known. Advantageous of the device described there is that as flat as possible and even application of pressure to the corrugated web Gluing is possible. The disadvantage is that due to the heating the water vapor escaping corrugated cardboard cannot escape because the Prevent the pressure plates from resting on the corrugated cardboard.

Der Erfindung liegt die Aufgabe zugrunde, eine Heizvorrichtung für Wellpappemaschinen bereitzustellen, bei der eine möglichst gleichmäßige und flächige Andrückung der Wellpappebahn bei gleichzeitig wirksamer Abführung des erzeugten Wasserdampfes möglich ist.The invention has for its object a heating device for corrugated cardboard machines To provide in the most uniform and flat pressing of the corrugated cardboard web with effective discharge of the water vapor generated is possible.

Die Aufgabe wird durch die Merkmale des kennzeichnenden Teils des Anspruches 1 gelöst. Der Kern der Erfindung besteht darin, daß das Ober-Transportband mit Dampf-Eintritts- und Dampf-Austritts-Öffnungen versehen ist und zwischen diesen ein freies Volumen in Form eines Dampf-Zwischen-Speichers vorgesehen ist. The task is characterized by the features of the characterizing part of the claim 1 solved. The essence of the invention is that the top conveyor belt with steam inlet and steam outlet openings and between them there is a free volume in the form of a vapor buffer is provided.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous embodiments of the invention result from the Dependent claims.

Zusätzliche Merkmale und Einzelheiten der Erfindung ergeben sich aus der Beschreibung von vier Ausführungsbeispielen anhand der Zeichnungen. Es zeigen

Fig. 1
eine Seitenansicht einer Heizvorrichtung gemäß einer ersten Ausführungsform,
Fig. 2
einen Längsschnitt durch ein Andrück-Element der Heizvorrichtung gemäß Fig. 1,
Fig. 3
eine Draufsicht auf ein Ober-Transportband der Heizvorrichtung gemäß Fig. 1,
Fig. 4
einen Querschnitt gemäß der Schnittlinie IV-IV in Fig. 3,
Fig. 5
einen Querschnitt durch ein Ober-Transportband gemäß einer zweiten Ausführungsform,
Fig. 6
einen Querschnitt durch ein Ober-Transportband gemäß einer dritten Ausführungsform und
Fig. 7
einen Längsschnitt durch ein Andrück-Element gemäß einer vierten Ausführungsform.
Additional features and details of the invention result from the description of four exemplary embodiments with reference to the drawings. Show it
Fig. 1
2 shows a side view of a heating device according to a first embodiment,
Fig. 2
2 shows a longitudinal section through a pressure element of the heating device according to FIG. 1,
Fig. 3
2 shows a top view of an upper conveyor belt of the heating device according to FIG. 1,
Fig. 4
3 shows a cross section along the section line IV-IV in FIG. 3,
Fig. 5
3 shows a cross section through an upper conveyor belt according to a second embodiment,
Fig. 6
a cross section through an upper conveyor belt according to a third embodiment and
Fig. 7
a longitudinal section through a pressure element according to a fourth embodiment.

Im folgenden wird unter Bezugnahme auf die Fig. 1 bis 4 eine erste Ausführungsform der Erfindung beschrieben. Eine Heizvorrichtung 1 weist einen gegenüber dem Boden 2 über Füße 3 abgestützten Tisch 4 auf, an dessen Oberseite entlang einer Transport-Richtung 5 benachbart zueinander über Heiz-Elemente 6 beheizbare Platten 7 angeordnet sind. Oberhalb der Platten 7 ist ein endloses Ober-Transportband 8 vorgesehen, das über Umlenk- bzw. Antriebs-Walzen 9 derart im Kreis geführt wird, daß dessen Untertrum 10 parallel zu den Platten 7 unter Begrenzung eines Kanales 11 in Transport-Richtung 5 transportierbar ist. Dem Tisch 4 entgegen der Transport-Richtung 5 vorgeordnet ist eine der Umlenkung des Ober-Transportbandes 8 dienende Umlenk-Walze 12 und eine darunter angeordnete, einen Einlauf-Spalt 13 bildende Gegen-Walze 14. Dem Einlauf-Spalt 13 werden wie in Fig. 1 gezeigt eine einseitige Wellpappelage 15, eine einseitige Wellpappelage 16 und eine Deckbahn 17 unter Bildung einer Wellpappebahn 18 zugeführt. Es ist selbstverständlich möglich, Wellpappebahnen anderen Aufbaus, wie z. B. lediglich aus einer einseitigen Wellpappelage und einer Deckbahn bestehend, zu verwenden. Die Wellpappebahn 18 wird entlang der Transport-Richtung 5 durch den Kanal 11 zwischen dem Untertrum 10 und den Platten 7 transportiert. Oberhalb der Platten 7 und des Untertrums 10 sind zahlreiche Andrück-Elemente 19 vorgesehen, die in Transport-Richtung benachbart zueinander, jeweils unter Bildung eines Spaltes 20 und gegeneinander versetzt angeordnet sind. Die Andrück-Elemente 19 drücken das Untertrum 10 flächig gegen die Wellpappebahn 18.A first embodiment will now be described with reference to Figs described the invention. A heater 1 has a table 4 supported against the floor 2 by feet 3 the top of which is adjacent to one another along a transport direction 5 6 heated plates 7 are arranged via heating elements. Above the Plates 7, an endless upper conveyor belt 8 is provided, which via deflection or drive rollers 9 is guided in a circle such that its Lower strand 10 parallel to the plates 7, delimiting a channel 11 is transportable in transport direction 5. The table 4 against Transport direction 5 is upstream of the deflection of the upper conveyor belt 8 serving deflection roller 12 and an arranged below it counter-roller 14 forming an inlet nip 13. The inlet nip 13, as shown in Fig. 1, a one-sided corrugated cardboard layer 15, a one-sided Corrugated cardboard layer 16 and a cover sheet 17 to form a corrugated cardboard sheet 18 fed. It is of course possible to use corrugated cardboard other construction such. B. only from a one-sided corrugated cardboard and a cover sheet to use. The corrugated cardboard web 18 is along the transport direction 5 through the channel 11 between the lower strand 10 and the plates 7 transported. Above the plates 7 and the lower strand 10, numerous pressing elements 19 are provided, which are adjacent to each other in the transport direction, each with formation of a gap 20 and offset from one another. The pressure elements 19 press the lower strand 10 flat against the corrugated cardboard web 18th

Jedes Andrück-Element 19, von denen eines in Fig. 2 vergrößert dargestellt ist, weist ein mit einem Maschinengestell verbundenes Lager 21 auf, an dessen Unterseite eine seitlich vorstehende Zwischenplatte 22 befestigt ist. Eine die Zwischenplatte 22 seitlich nach Art eines Schuhes umgreifende Andrück-Platte 23 ist gegenüber dem Lager 21 durch Druckfedern 24 federnd vorgespannt. Die Andrück-Platte 23 weist auf ihrer Unterseite eine ebene sich in Transport-Richtung 5 erstreckende Andrück-Fläche 25 auf. Die Andrück-Platte 23 weist in Transport-Richtung 5 eine Länge von 200 bis 600 mm auf, wobei der Spalt 20 in Transport-Richtung 5 eine Breite von ungefähr 20 mm besitzt. Im oberhalb der Zwischenplatte 22 angeordneten Randbereich 26 der Andrück-Platte 23 sind verstellbare Anschlagstifte 27 vorgesehen, die die maximale Verschiebung der Zwischenplatte 22 relativ zum Lager 21 begrenzen. Ansonsten ist die Andrück-Platte 23 senkrecht zur Transport-Richtung 5 flexibel auslenkbar. Das Andrück-Element 19 liegt mit seinem Eigengewicht auf der Wellpappebahn 18 auf. Eine genauere Beschreibung des Aufbaues der Heizvorrichtung 1 und insbesondere des Aufbaues der Andrück-Elemente 19 ist aus der DE 198 11 858 A1 (entspr. US Ser.No. 09/271 230) bekannt, auf die hiermit verwiesen wird.Each pressing element 19, one of which is shown enlarged in FIG. 2 has a bearing 21 connected to a machine frame the underside of which is attached to a laterally projecting intermediate plate 22. A laterally encompassing the intermediate plate 22 in the manner of a shoe Pressure plate 23 is resilient with respect to the bearing 21 by compression springs 24 biased. The pressure plate 23 has one on its underside level pressing surface 25 extending in the transport direction 5. The pressure plate 23 has a length of 200 in the transport direction 5 to 600 mm, with the gap 20 in the transport direction 5 a width of about 20 mm. Arranged above the intermediate plate 22 Edge area 26 of the pressure plate 23 are adjustable stop pins 27 provided the maximum displacement of the intermediate plate 22nd limit relative to the bearing 21. Otherwise, the pressure plate 23 is vertical can be flexibly deflected to the transport direction 5. The pressure element 19 lies on the corrugated cardboard web 18 with its own weight. A more precise one Description of the structure of the heater 1 and in particular the structure of the pressing elements 19 is from DE 198 11 858 A1 (corresponds to US Ser.No. 09/271 230), to which reference is hereby made.

Das Ober-Transportband 8, das in den Fig. 3 und 4 vergrößert dargestellt ist, weist eine Grundfläche 28 mit in Form von Längsschlitzen ausgebildeten Eintritts-Öffnungen 29 und eine Deckfläche 30 mit entsprechenden Austritts-Öffnungen 31 auf. Zwischen den Eintritts-Öffnungen 29 und den Austritts-Öffnungen 31 sind mit diesen verbundene, quer zur Transport-Richtung 5 verlaufende, im wesentlichen einen rechteckigen Querschnitt aufweisende Dampf-Kanäle 32 vorgesehen. Das freie Volumen im Band 8 dient als Dampf-Zwischen-Speicher. Das Ober-Transportband 8 weist quer zur Transport-Richtung 5 verlaufende Querglieder 33 auf, die die Form einer flachgedrückten, schraubenlinienförmigen Wendel haben, wobei die Wendel durch einen Wendeldraht 34 mit kreisförmigem Querschnitt gebildet wird. Die Zwischenräume zwischen benachbarten Gängen der Wendel bilden die Eintritts-Öffnungen 29 bzw. Austritts-Öffnungen 31. Benachbarte Querglieder 33 sind nach Art eines Scharnieres miteinander verbunden, wobei die Wendelgänge benachbarter Querglieder 33 alternierend ineinandergreifen und durch einen quer zur Transport-Richtung verlaufenden Querstab 35 miteinander verbunden sind. Hierbei wird der Querstab 35 abwechselnd von dem Wendeldraht 34 des in Fig. 3 links davon und rechts davon liegenden Quergliedes 33 umschlungen. Durch die Art der Verbindung der Querglieder 33 können diese gegeneinander verschwenkt werden, so daß das Ober-Transportband 8 die erforderliche Flexibilität erhält. Der Dampf-Kanal 32 wird durch den von dem Wendeldraht 34 des jeweiligen Quergliedes 33 umschlossenen Raum gebildet.The upper conveyor belt 8, which is shown enlarged in FIGS. 3 and 4 has a base surface 28 formed in the form of longitudinal slots Inlet openings 29 and a top surface 30 with corresponding Exit openings 31. Between the inlet openings 29 and Outlet openings 31 are connected to these, transversely to the transport direction 5 extending, essentially a rectangular cross section having steam channels 32 provided. The free volume in volume 8 serves as a steam buffer. The upper conveyor belt 8 points across to the transport direction 5 extending cross members 33 on the shape have a flattened, helical spiral, the Helix formed by a helical wire 34 with a circular cross section becomes. The gaps between adjacent turns of the helix form the inlet openings 29 and outlet openings 31 Cross members 33 are connected to one another in the manner of a hinge, the helical paths of adjacent cross members 33 alternately interlocking and by one running transversely to the transport direction Cross bar 35 are interconnected. Here, the cross bar 35 alternately from the spiral wire 34 of the left of this in Fig. 3 and the right of which cross member 33 is wrapped. By the type of connection the cross members 33 can be pivoted against each other, so that the upper conveyor belt 8 receives the required flexibility. The Steam channel 32 is through that of the spiral wire 34 of each Cross member 33 formed space.

Hinsichtlich der Dimensionierung und Materialwahl des Ober-Transportbandes 8 gilt folgendes: Die Wendeldrähte 34 und Querstäbe 35 sind aus Kunststoff, insbesondere Polyester, Polyamid oder Polyethylen hergestellt. Es ist jedoch auch möglich, metallische Legierungen und insbesondere Stahl zu verwenden. Gemäß der vorliegenden Ausführungsform weist der Wendeldraht 34 einen Durchmesser von 1,2 mm und die Querstäbe einen Durchmesser von 1,05 mm auf. Die Dicke D des Bandes 8 beträgt 3,7 mm. Die Breite B der Kanäle 32 beträgt ungefähr 7 mm. Die Höhe H der Kanäle beträgt ungefähr 1,3 mm. Es ist selbstverständlich möglich, die Dimensionierung des Bandes 8 zu verändern und insbesondere eine feinere Struktur zu verwenden. Die Außenkontur des Bandes 8 wird durch die Grundfläche 28, die Deckfläche 30 sowie zwei Seitenflächen 36 begrenzt, die ein Außenkontur-Volumen VA einschließen. Die Eintritts-Öffnungen 29, Austritts-Öffnungen 31 und Dampf-Kanäle 32, das heißt die die Dampf-Zwischen-Speicher bildenden Hohlräume des Bandes 8, die nicht durch die Wendeldrähte 34 und Querstäbe 35 ausgefüllt sind, weisen insgesamt ein Dampf-Aufnahmevolumen VD auf. Für das Verhältnis VD zu VA gilt 0,95 ≥ VD/VA ≥ 0,15, insbesondere 0,85 ≥ VD/VA ≥ 0,3 und besonders vorteilhaft 0,75 ≥ VD/VA ≥ 0,45. Für das wie vor dimensionierte Band 8 gilt ungefähr VD/VA ≈ 0,6. Die die Form von Längsschlitzen aufweisenden Eintritts-Öffnungen 29 bzw. Austritts-Öffnungen 31 verlaufen bedingt durch die Geometrie der Wendel schräg zur Transport-Richtung 5 und schließen mit der Transport-Richtung einen Winkel a ein, für den gilt 0,5° ≤ a ≤ 20° und insbesondere 2° ≤ a ≤ 10°.The following applies with regard to the dimensioning and choice of material of the upper conveyor belt 8: The helical wires 34 and cross bars 35 are made of plastic, in particular polyester, polyamide or polyethylene. However, it is also possible to use metallic alloys and especially steel. According to the present embodiment, the spiral wire 34 has a diameter of 1.2 mm and the cross bars have a diameter of 1.05 mm. The thickness D of the band 8 is 3.7 mm. The width B of the channels 32 is approximately 7 mm. The height H of the channels is approximately 1.3 mm. It is of course possible to change the dimensioning of the band 8 and in particular to use a finer structure. The outer contour of the band 8 is delimited by the base surface 28, the top surface 30 and two side surfaces 36, which enclose an outer contour volume V A. The inlet openings 29, outlet openings 31 and steam channels 32, that is to say the cavities of the strip 8 which form the steam intermediate stores and which are not filled by the helical wires 34 and cross bars 35, have a steam absorption volume V overall D on. The ratio V D to V A is 0.95 ≥ V D / V A 0,1 0.15, in particular 0.85 V V D / V A 0,3 0.3 and particularly advantageously 0.75 V V D / V A. 0.45. Approximately V D / V A ≈ 0.6 applies to the band 8 dimensioned as before. Due to the geometry of the helix, the inlet openings 29 or outlet openings 31, which have the shape of longitudinal slots, run obliquely to the transport direction 5 and form an angle a with the transport direction, for which 0.5 ° a a applies ≤ 20 ° and in particular 2 ° ≤ a ≤ 10 °.

Im folgenden wird die Funktionsweise der Heizvorrichtung 1 und insbesondere die des Ober-Transportbandes 8 beschrieben. Die einlaufenden beleimten Wellpappelagen 15, 16 und die Deckbahn 17 werden im Einlauf-Spalt 13 zusammengeführt. Anschließend wird die Wellpappebahn 18 über die Platten 7 des Tisches 4 transportiert, wobei die beheizten Platten 7, die normalerweise eine Temperatur von 180° C haben, die Wellpappebahn 18 auf eine Temperatur von ungefähr 90°C - 130°C erwärmen, um das im Leim enthaltene Wasser zumindest teilweise zu verdampfen. Die Andrück-Elemente 19 üben über das Transportband 8 eine gleichmäßige Andrück-Kraft auf die Wellpappebahn 18 aus, um sicherzustellen, daß gut haltende Verklebungen entstehen. Das Ober-Transportband 8, dessen Untertrum 10 mit der Wellpappebahn 18 in Kontakt ist, transportiert die Wellpappebahn 18 mit in Transport-Richtung 5. Der infolge der Erwärmung durch die Platten 7 aus der Wellpappebahn 18 austretende Wasserdampf tritt durch die Eintritts-Öffnungen 29 in die Dampf-Kanäle 32 des Ober-Transportbandes 8 ein und wird dort primär zwischengespeichert. Ein Teil des Dampfes kann durch die seitlichen Öffnungen der Dampf-Kanäle 32 entweichen. Der andere Teil des Dampfes tritt durch die Austritts-Öffnungen 31 aus, wenn diese den Spalt 20 zwischen zwei Andrück-Elementen 19 passieren und die Austritts-Öffnungen 31 zu diesem Zeitpunkt nicht durch die Andrück-Platte 23 verschlossen sind. Besonders vorteilhaft ist, daß eine flächige Andrückung durch die Andrück-Elemente 19 beibehalten werden kann und gleichzeitig der austretende Dampf durch das Ober-Transportband 8 zunächst zwischengespeichert und dann abgeführt werden kann. Die hierdurch entstehenden Verklebungen weisen eine besonders hohe Qualität auf. Die schräg zur Transport-Richtung unter einem Winkel a verlaufenden Eintritts-Öffnungen 29 und Austritts-Öffnungen 31 hinterlassen auf der Wellpappebahn kein Muster, da infolge des immer existierenden, wenn auch geringen Schlupfes zwischen dem Ober-Transportband 8 und der Wellpappebahn 18 ein Einprägen des Musters des Ober-Transportbandes 8 nicht erfolgen kann. Dies wird verhindert durch die Zick-Zack-Form der Öffnungen 29 bzw. 31.The following is the operation of the heater 1 and in particular that of the upper conveyor belt 8 described. The incoming glued corrugated cardboard layers 15, 16 and the cover sheet 17 are in the inlet gap 13 merged. The corrugated cardboard web 18 is then over the plates 7 of the table 4 transported, the heated plates 7, the normally have a temperature of 180 ° C, the corrugated web 18 heat to a temperature of approximately 90 ° C - 130 ° C in order to Glue contained water to evaporate at least partially. The pressure elements 19 exercise a uniform pressing force on the conveyor belt 8 on the corrugated web 18 to ensure that it holds well Bonding occurs. The upper conveyor belt 8, the lower strand 10 is in contact with the corrugated cardboard web 18, transports the corrugated cardboard web 18 with in the transport direction 5. As a result of the heating by the Plates 7 water vapor emerging from the corrugated cardboard web 18 passes through the inlet openings 29 into the steam channels 32 of the upper conveyor belt 8 and is primarily cached there. A part of the steam can pass through the side openings of the steam channels 32 escape. The other part of the steam passes through the outlet openings 31 out if this gap 20 between two pressure elements 19 pass and the outlet openings 31 at this time are not closed by the pressure plate 23. Particularly advantageous is that a flat pressure by the pressure elements 19th can be maintained and at the same time the escaping steam through the Upper conveyor belt 8 is temporarily stored and then discharged can be. The resulting bonds show a special high quality. The diagonal to the transport direction under one Entry openings 29 and exit openings 31 running at an angle a do not leave a pattern on the corrugated cardboard web, as the albeit slight slip between the upper conveyor belt 8 and the corrugated cardboard web 18 embossing the pattern of the Upper conveyor belt 8 can not be done. This is prevented by the zigzag shape of the openings 29 and 31, respectively.

Im folgenden wird unter Bezugnahme auf Fig. 5 eine zweite Ausführungsform der Erfindung beschrieben. Identische Teile erhalten dieselben Bezugszeichen wie bei der ersten Ausführungsform, auf deren Beschreibung hiermit verwiesen wird. Konstruktiv unterschiedliche, jedoch funktionell gleichartige Teile erhalten dieselben Bezugszeichen mit einem hochgesetzten Strich. Der wesentliche Unterschied gegenüber der ersten Ausführungsform besteht im Aufbau des Ober-Transportbandes 8'. Dieses weist entlang seiner beiden Randbereiche 37 ein mit dem Band 8' verbundenes Stützband 38 auf, das von dem Band 8' in Richtung der Platte 7 vorsteht. A second embodiment will now be described with reference to FIG. 5 described the invention. Identical parts are given the same reference symbols as in the first embodiment, based on the description thereof is hereby referred. Structurally different, but functional Similar parts are given the same reference symbols with a superscript Dash. The main difference from the first embodiment consists in the construction of the upper conveyor belt 8 '. This points along its two edge regions 37 one connected to the band 8 ' Support band 38 which protrudes from the band 8 'in the direction of the plate 7.

Das Stützband 38 ist aus einem temperaturbeständigen Material, insbesondere Polytetrafluorethylen oder Polyamid hergestellt. Es ist auch möglich, das Stützband 38 dadurch zu erzeugen, daß der Randbereich 37 mit einem entsprechend temperaturbeständigen Harz getränkt wird, das in Form des Stützbandes 38 gegenüber dem Band 8' hervorsteht. Das Band 8' gemäß der zweiten Ausführungsform wird verwendet, wenn die Breite W der Wellpappebahn 18 kleiner ist als die Breite des Ober-Transportbandes 8', so daß dieses auf die Platten 7 herunterhängen und durch deren vergleichsweise hohe Temperatur beschädigt werden könnte.The support band 38 is made of a temperature-resistant material, in particular Polytetrafluoroethylene or polyamide made. It is also possible, to generate the support band 38 in that the edge region 37 with a is soaked in temperature-resistant resin, which in the form of Support band 38 protrudes from the band 8 '. The tape 8 'according the second embodiment is used when the width W is Corrugated cardboard web 18 is smaller than the width of the upper conveyor belt 8 ', so that this hang down on the plates 7 and by their comparative high temperature could be damaged.

Im folgenden wird unter Bezugnahme auf Fig. 6 eine dritte Ausführungsform der Erfindung beschrieben. Identische Teile erhalten dieselben Bezugszeichen wie bei der ersten Ausführungsform, auf deren Beschreibung hiermit verwiesen wird. Konstruktiv unterschiedliche, jedoch funktionell gleichartige Teile erhalten dieselben Bezugszeichen mit zwei hochgesetzten Strichen. Der Unterschied gegenüber der in Figur 5 dargestellten zweiten Ausführungsform besteht darin, daß an den Randbereichen 37 des Bandes 8 jeweils Stützkeile 39 vorgesehen sind, die über eine Spindel 40 und einen Motor 41 quer zur Transport-Richtung 5 verschiebbar sind, wodurch eine Abstützung des überhängenden Ober-Transportbandes 8 erfolgt. Hierdurch wird verhindert, daß dieses mit den beheizten Platten 7 direkt in Kontakt kommt.A third embodiment will now be described with reference to FIG. 6 described the invention. Identical parts are given the same reference symbols as in the first embodiment, based on the description thereof is hereby referred. Structurally different, but functional Similar parts are given the same reference numerals with two superscripts Strokes. The difference compared to the second shown in Figure 5 Embodiment is that at the edge regions 37 of the tape 8 supporting wedges 39 are provided, which are connected via a spindle 40 and a motor 41 can be moved transversely to the transport direction 5, whereby the overhanging upper conveyor belt 8 is supported. Hereby it is prevented that this with the heated plates 7 directly in Contact comes.

Im folgenden wird unter Bezugnahme auf Fig. 7 eine vierte Ausführungsform der Erfindung beschrieben. Identische Teile erhalten dieselben Bezugszeichen wie bei der ersten Ausführungsform, auf deren Beschreibung hiermit verwiesen wird. Konstruktiv unterschiedliche, jedoch funktionell gleichartige Teile erhalten dieselben Bezugszeichen mit drei hochgesetzten Strichen. Der wesentliche Unterschied gegenüber der ersten Ausführungsform besteht im Aufbau des Andrück-Elementes 19"'. Die Andrück-Platte 23"' ist über in der Zwischenplatte 22"' gefedert verschiebbare Hülsen 42 mit der Zwischen-Platte 22"' verschraubt, so daß diese Andrück-Platte 23"' relativ zur Zwischenplatte 22"' beweglich ist. In der Andrück-Platte 23"' sind zur Andrück-Fläche 25 hin offene Bohrungen 43 vorgesehen, die über einen quer dazu verlaufenden Kanal 44 mit Absaug-Anschlüssen 45 verbunden sind. Hierdurch ist es möglich, zusätzlich zu der Abführung des aus der Wellpappebahn 18 austretenden Dampfes durch das Ober-Transportband 8 den Dampf durch die Austritts-Öffnungen 31, die Bohrungen 43, den Kanal 44 und die Absaug-Anschlüsse 45 abzusaugen. Hierdurch wird die Abführung des Dampfes nochmals verbessert.A fourth embodiment will now be described with reference to FIG. 7 described the invention. Identical parts are given the same reference symbols as in the first embodiment, based on the description thereof is hereby referred. Structurally different, but functional Similar parts are given the same reference numerals with three superscripts Strokes. The main difference from the first embodiment consists in the construction of the pressure element 19 "'. The pressure plate 23 "'is via sleeves 42 which are spring-loaded in the intermediate plate 22"' screwed to the intermediate plate 22 "', so that this pressure plate 23 "'is movable relative to the intermediate plate 22"'. In the pressure plate 23 "'bores 43 are provided towards the pressing surface 25, which via a channel 44 running transversely thereto with suction connections 45 are connected. This makes it possible, in addition to the removal of the steam emerging from the corrugated cardboard web 18 through the upper conveyor belt 8 the steam through the outlet openings 31, the bores 43, vacuum the channel 44 and the suction connections 45. Hereby the removal of the steam is further improved.

Claims (12)

Heizvorrichtung (1) für eine Wellpappemaschine mit a) einem Tisch (4) mit mindestens einer beheizbaren Platte (7), b) einem oberhalb der Platte (7) angeordneten, in eine Transport-Richtung (5) verschiebbaren, endlosen Ober-Transportband (8; 8'), c) einem von der mindestens einen Platte (7) und dem Ober-Transportband (8; 8') begrenzten Kanal (11) zur Aufnahme und Führung einer in die Transport-Richtung (5) transportierbaren Wellpappebahn (18) und d) Andrück-Platten (23; 23"') zum flächigen Andrücken des Ober-Transportbandes (8; 8') gegen die Wellpappebahn (18), wobei die Andrück-Platten (23; 23"') in Transport-Richtung (5) benachbart zueinander, jeweils unter Bildung eines Spalts (20) angeordnet sind, dadurch gekennzeichnet, daß e) das Ober-Transportband (8; 8') aufweist i) auf der der mindestens einen Platte (7) benachbarten Seite freie Eintritts-Öffnungen (29) zur Aufnahme von aus der Wellpappebahn (18) austretendem Dampf, ii) auf der den Andrück-Platten (23; 23') benachbarten Seite freie Austritts-Öffnungen (31) zur Abgabe des Dampfes an die Umgebung und iii) zwischen den Eintritts-Öffnungen (29) und den Austritts-Öffnungen (31) angeordnete, mit diesen verbundene, ein freies Volumen aufweisende Dampf-Zwischen-Speicher. Heating device (1) for a corrugated cardboard machine with a) a table (4) with at least one heatable plate (7), b) an endless upper conveyor belt (8; 8 ') arranged above the plate (7) and displaceable in a transport direction (5), c) a channel (11) delimited by the at least one plate (7) and the upper conveyor belt (8; 8 ') for receiving and guiding a corrugated cardboard web (18) which can be transported in the transport direction (5) and d) pressure plates (23; 23 "') for pressing the upper conveyor belt (8; 8') flat against the corrugated cardboard web (18), the pressure plates (23; 23"') in the transport direction (5th ) are arranged adjacent to one another, in each case forming a gap (20), characterized in that e) the upper conveyor belt (8; 8 ') i) free inlet openings (29) on the side adjacent to the at least one plate (7) for receiving steam emerging from the corrugated cardboard web (18), ii) on the side adjacent to the pressure plates (23; 23 '), free outlet openings (31) for releasing the steam to the environment and iii) steam intermediate stores arranged between the inlet openings (29) and the outlet openings (31) and connected to them and having a free volume. Heizvorrichtung (1) gemäß Anspruch 1, dadurch gekennzeichnet, daß die Eintritts-Öffnungen (29) und/oder die Austritts-Öffnungen (31) im Querschnitt die Form eines Längsschlitzes aufweisen.Heating device (1) according to claim 1, characterized in that the inlet openings (29) and / or the outlet openings (31) have the shape of a longitudinal slot in cross section. Heizvorrichtung (1) gemäß Anspruch 2, dadurch gekennzeichnet, daß die Längsschlitze schräg zur Transport-Richtung (5) verlaufen.Heating device (1) according to claim 2, characterized in that the longitudinal slots run obliquely to the transport direction (5). Heizvorrichtung (1) gemäß Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Längsschlitze mit der Transport-Richtung (5) einen Winkel a einschließen, für den gilt: 0,5° ≤ a ≤ 20° und insbesondere 2° ≤ a ≤10°.Heating device (1) according to claim 2 or 3, characterized in that the longitudinal slots form an angle a with the transport direction (5), for which the following applies: 0.5 ° ≤ a ≤ 20 ° and in particular 2 ° ≤ a ≤10 °. Heizvorrichtung (1) gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Dampf-Zwischen-Speicher quer zur Transport-Richtung (5) verlaufende Dampf-Kanäle (32) aufweisen.Heating device (1) according to one of the preceding claims, characterized in that the intermediate steam stores have steam channels (32) running transversely to the transport direction (5). Heizvorrichtung (1) gemäß Anspruch 5, dadurch gekennzeichnet, daß die Dampf-Kanäle (32) jeweils im wesentlichen einen rechteckigen Querschnitt aufweisen.Heating device (1) according to claim 5, characterized in that the steam channels (32) each have a substantially rectangular cross section. Heizvorrichtung (1) gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Ober-Transportband (8) eine Außenkontur aufweist, die durch eine ebene Grundfläche (28), eine parallel zu dieser verlaufende Deckfläche (30) und senkrecht zu diesen verlaufende, zueinander parallele Seitenflächen (36) gebildet wird.Heating device (1) according to one of the preceding claims, characterized in that the upper conveyor belt (8) has an outer contour, which by a flat base surface (28), a cover surface (30) running parallel to this and perpendicular to these, to each other parallel side surfaces (36) is formed. Heizvorrichtung (1) gemäß Anspruch 7, dadurch gekennzeichnet, daß die Außenkontur ein Volumen VA umschließt und die Dampf-Zwischen-Speicher insgesamt ein freies Volumen VD aufweisen, wobei für das Verhältnis VD/VA gilt: 0,95 ≥ VD/VA ≥ 0,15, insbesondere 0,85 ≥ VD/VA ≥ 0,3 und besonders vorteilhaft 0,75 ≥ VD/VA ≥ 0,45.Heating device (1) according to claim 7, characterized in that the outer contour encloses a volume V A and the steam intermediate store has a total free volume V D , the following being valid for the ratio V D / V A : 0.95 ≥ V D / V A ≥ 0.15, in particular 0.85 ≥ V D / V A ≥ 0.3 and particularly advantageously 0.75 ≥ V D / V A ≥ 0.45. Heizvorrichtung (1) gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Ober-Transportband (8) Querglieder (33) aufweist, die miteinander längsseitig nach Art eines Scharnieres verbunden sind.Heating device (1) according to one of the preceding claims, characterized in that the upper conveyor belt (8) has cross members (33) which are connected to one another on the longitudinal side in the manner of a hinge. Heizvorrichtung (1) gemäß Anspruch 9, dadurch gekennzeichnet, daß die Querglieder (33) als flachgedrückte Wendel mit Wendelgängen ausgebildet sind.Heating device (1) according to claim 9, characterized in that the cross members (33) are designed as flattened helix with helical paths. Heizvorrichtung (1) gemäß Anspruch 10, dadurch gekennzeichnet, daß die Wendelgänge benachbarter Querglieder (33) alternierend ineinandergreifen und durch einen Querstab (35) miteinander verbunden sind.Heating device (1) according to claim 10, characterized in that the helical paths of adjacent cross members (33) engage alternately and are connected to one another by a cross bar (35). Heizvorrichtung (1) gemäß Anspruch 1, dadurch gekennzeichnet, daß die Andrück-Platten (23"') zum Kanal (11) hin offene Bohrungen (43) aufweisen, die mit einer Absaug-Einrichtung zum Absaugen des Dampfes verbindbar sind.Heating device (1) according to Claim 1, characterized in that the pressure plates (23 "') have bores (43) which are open towards the channel (11) and which can be connected to a suction device for sucking off the steam.
EP00123952A 1999-11-15 2000-11-03 Heating device for a corrugating machine Withdrawn EP1101599A1 (en)

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