EP1621498B1 - Guiding device for printed materials - Google Patents

Guiding device for printed materials Download PDF

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Publication number
EP1621498B1
EP1621498B1 EP05012938A EP05012938A EP1621498B1 EP 1621498 B1 EP1621498 B1 EP 1621498B1 EP 05012938 A EP05012938 A EP 05012938A EP 05012938 A EP05012938 A EP 05012938A EP 1621498 B1 EP1621498 B1 EP 1621498B1
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EP
European Patent Office
Prior art keywords
coolant
guide surface
guide
cooling capillaries
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05012938A
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German (de)
French (fr)
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EP1621498A3 (en
EP1621498A2 (en
Inventor
Volker Kessler
Volker Taschenberger
Tilo Steinborn
Ralf Reichenberger
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Koenig and Bauer AG
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Koenig and Bauer AG
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Publication date
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Publication of EP1621498A2 publication Critical patent/EP1621498A2/en
Publication of EP1621498A3 publication Critical patent/EP1621498A3/en
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Publication of EP1621498B1 publication Critical patent/EP1621498B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
    • B65H5/228—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by air-blast devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/514—Modifying physical properties
    • B65H2301/5144—Cooling

Definitions

  • the invention relates to a guide for substrates in the field of action of dryers according to the preamble of the first claim.
  • Cooled sheet guiding surfaces are used in printing presses with dryer units.
  • coolant flow channels are placed on the back of the baffles, with trough channels connected to the back of the baffle (eg DE 29816734 U ).
  • a disadvantage is the high cost of the seal against leakage of the coolant.
  • the guide surfaces are double-walled over the entire surface, wherein coolant flows in the formed sandwich-like cavity (eg DE 195 21 442 A1 ).
  • a disadvantage is the high production cost of the blast air ducting of sheets and the lack of torsional rigidity.
  • the invention is therefore based on the object to provide, starting from the disadvantages of the prior art, a sheet guide with optimum heat dissipation, which has a high flexibility in the adaptation to pneumatic Betigstoff Unitsstoff.
  • the solution according to the invention has the advantage that the guide surface cross section is designed so that the dissipated heat is brought as evenly as possible to the coolant channels from all sides and the heat flux densities over the entire cross section are approximately equal. As a result, a uniform heat dissipation to the coolant channels is achieved with economic material use. At the same time, the printing material can be prevented from damaging temperature peaks within the guide surface.
  • the guide according to the invention also has the advantage of getting along with larger distances of the coolant channels in comparison to the known prior art, so that the adaptation of the guide surface to the sheet web or to required pneumatic sheet guiding tasks is significantly simplified.
  • the large material cross-sections of the guide according to the invention cause a high bending stiffness and thus low distortions at low height.
  • driers are arranged along the sheet path to support the drying process, in particular after coating units and in the delivery area of sheet-fed printing machines.
  • these opposite Bescherstoffleit stylesen are arranged in the area of action of the dryer, which lead the substrate on flat or curved guide surfaces. As a result of the heat radiation of the dryer, there is an undesirable heating of the guide surfaces.
  • the guide surface 1 has parallel channels through which coolant flows.
  • the guide surface 1 with the integrated coolant channels 3 can be produced in one piece, preferably after the extrusion of aluminum alloys, wherein a plurality of Leit vommodule can be combined to form a larger guide surface.
  • the coolant channels 3 are arranged transversely to the transport direction of the printing material.
  • the printing material-carrying surface 2 of the guide surface 1 is smooth and can be equipped to support Abschmierillon with ink-repellent coatings.
  • the extruded profiles can be produced with appropriate pressing dies with the desired curvature or subsequently formed with heating.
  • the cross-sectional profile of the guide surface 1 is characterized by in the direction of the coolant channels 3 continuously expanding material cross-sections which are approximately equal in the region of the coolant channels 3 on the printing material-carrying surface 2 of the guide surface 1 and facing away from her side of the coolant channels 3 ,
  • the cross-section of the guide surface 1 perpendicular to the printing material-carrying surface 2 decreases with increasing distance from the coolant channels 3.
  • the coolant channels 3 Symmetrically between the coolant channels 3 is the zone with the smallest material cross-section.
  • the coolant channels 3 pass through the guide surface 1 approximately centrally in the areas with the respective largest cross sections.
  • the coolant channels 3 have substantially smaller diameters of about 4-10 mm than known channels and are therefore referred to below as cooling capillaries 3 in an idealized manner.
  • the length of the heat dissipation path can be increased without increasing the thermal resistance. This makes it possible to increase the distance between the cooling capillaries 3, without accepting harmful temperature differences within the profile.
  • sufficient cooling capacities can be achieved even at diameters of about 6 mm, with optimum capillary distances being about 90 mm. Small channel diameters and large distances mean a great deal of freedom in the introduction of openings and nozzles 5 to support the printing substrate, so that almost any arrangement can be realized.
  • the baffle cross section widens approximately linearly in the direction of the cooling capillaries 3 on the baffle underside, so that reinforcements of the baffle surface 1 comparable to three-sided prisms are formed in whose longitudinal axes the cooling capillaries 3 run.
  • the cross-sectional enlargements 4 may be sinusoidal, so that a wave-shaped Leit vomunterseite is formed.
  • the second variant ( Fig. 2 ) of the guide surface 1 according to the invention is characterized by strip-shaped zones of constant cross-section between the cooling capillaries 3. In these zones, the guide surface has the lowest material thickness. These zones are provided for air openings 5 for pneumatic sheet guiding means. If the diffusers combined with air boxes on their underside, the guide surfaces 1 for suction or Blas Kunststoff entry the substrates, such as paper or cardboard sheets, can be used. As a result of the air streams passing through the guide surface 1, the guide surface 1 is additionally cooled in the region of the air openings 5, so that the heat dissipation to the cooling capillaries 3 does not have to be forced through high material cross sections.
  • a variant which is advantageous for reducing the temperature gradients along the cooling capillaries 3 in the guide surface 1 forms the arrangement of cooling capillaries 3 flowed through in series with an opposite flow direction, ie of the coolant supply and return, in each cross-sectional widening 4 (FIG. Figure 3 ).
  • coolant distributor 7 For coolant supply into the cooling capillaries 3 are coolant distributor 7 with a large flow cross-section, each supplying a group of cooling capillaries 3 in parallel with coolant.
  • the coolant distributors 7 are arranged on the end faces of the guide surface (s) 1 on both sides of the transport path of the printing substrate and connected directly to the cooling capillaries 3 via pipe connecting elements ( Figure 4 ) or are located at locations remote from the guide surfaces 1 and are coupled to the cooling capillaries 3 by means of rigid or flexible pipe connections 8 ( Fig. 5 ).
  • the latter variant is advantageous for increased flexibility in the guide surface arrangement, for example in the case of a curved guide surface 1, for deflecting the substrate or for reasons of accessibility.
  • the coolant distributors 7 have medium or end feeds and outlets for the coolant.
  • the individual fins 1 may be mounted on the front side rails with recesses for the cross-sectional extensions 4 of the fins 1 and be provided with U-shaped side panels for protection against burns.
  • Guide surfaces 1 for larger substrate widths are supported centrally with additional support elements.
  • the guide surfaces 1 are provided on both sides with interlocking or overlapping sealing profiles 6 (FIG. Fig.1 . 2 ).
  • the thermal resistance between the dryer facing top of the guide surface and the top of the coolant channels due the higher material cross-section is substantially less than between the guide surface and the back of the coolant channels.
  • Heat, which should be directed to the back of the channel, must overcome a much longer distance, the small material cross-section of the channel wall also acts as a "bottleneck".
  • the underside of the coolant channel is thus practically ineffective as a heat exchange surface.
  • the heat flow 10 is made possible by means of large material cross sections as low as possible path to the underside of the coolant capillary 3, and due to the small channel dimensions also no significant path differences between the channel top and channel bottom are present.
  • the approximately same material thickness between the upper side of the channel and the guide surface 1 and the underside of the guide surface ensures that the thermal resistances, which are determined by the conductive cross section and the length of the conductive cross section, between the guide surface 1 and the upper side of the coolant capillary 3 and between the guide surface 1 and the underside of the coolant capillary 3 are approximately equal, so that the entire coolant channel surface is involved in the heat exchange.
  • the additional thermal coupling of the channel bottoms has the significant advantage that the cross section of the coolant capillary 3 can be selected much smaller than previously known coolant channels with the same cooling effect. As the surface area increases, the absorbed heat flow 10 also increases in the direction of the coolant capillary 3.
  • the ratio between the heat flow 10 and the heat-transmitting cross-sectional area and therefore the heat flow density remains constant.
  • the temperature distribution due to the approximately constant heat flux density is much more uniform than in known guide surfaces with coolant channels arranged on one side, which leads to the reduction of temperature peaks and lower distortions of the guide surface 1.
  • the arrangement of the cooling capillaries 3 transversely to the transport direction of the printing material allows a better controllability of the temperature by zone-wise adjustment of the cooling capacity in the transport direction according to the heat radiation emitted by the dryers. 9 With the adjacent arrangement of cooling capillaries 3 gem. Fig.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The equipment has a control surface (1) that is connected with a coolant system. A set of coolant capillaries (3) are integrated parallel to the control surface, where coolant flows through the capillaries. The coolant capillaries are provided in a direction transverse to a print substrate and cross section of the control surface is formed such that dissipated heat is provided to coolant channels. An independent claim is also included for a sheet fed printing machine with control equipment.

Description

Die Erfindung betrifft eine Leiteinrichtung für Bedruckstoffe im Wirkungsbereich von Trocknern gemäß dem Oberbegriff des ersten Anspruches.
Gekühlte Bogenleitflächen werden in Druckmaschinen mit Trocknereinheiten eingesetzt. Um zu verhindern, dass Leitflächen durch Wärmestrahlung der Trockner erhitzt werden und die Bogen (insbesondere beim Bedrucken von Kunststoffen) schädigen oder sich verwerfen, werden Kühlmittel durchströmte Kanäle auf der Rückseite der Leitflächen angeordnet, wobei wannenförmige Kanäle mit der Rückseite der Leitfläche verbunden sind (z.B. DE 29816734 U ). Nachteilig ist der hohe Aufwand für die Abdichtung gegen Austritt des Kühlmittels. In einer anderen bekannten Variante sind die Leitflächen ganzflächig doppelwandig ausgeführt, wobei in dem gebildeten sandwichartigen Hohlraum Kühlmittel strömt (z.B. DE 195 21 442 A1 ). Nachteilig ist der hohe Fertigungsaufwand für die Blasluftführung von Bogen und die mangelnde Verwindungssteifigkeit.The invention relates to a guide for substrates in the field of action of dryers according to the preamble of the first claim.
Cooled sheet guiding surfaces are used in printing presses with dryer units. To prevent baffles from being heated by heat radiation from the dryers and damaging or bowing the sheets (especially when printing plastics), coolant flow channels are placed on the back of the baffles, with trough channels connected to the back of the baffle (eg DE 29816734 U ). A disadvantage is the high cost of the seal against leakage of the coolant. In another known variant, the guide surfaces are double-walled over the entire surface, wherein coolant flows in the formed sandwich-like cavity (eg DE 195 21 442 A1 ). A disadvantage is the high production cost of the blast air ducting of sheets and the lack of torsional rigidity.

Aus der DE 198 42 740 C2 ist eine pneumatische Bogenleiteinrichtung mit gekühlter Führungsfläche und mit Blasluftöffnungen in der Führungsfläche zur Unterstützung der Bogenförderung bekannt, bei dem die Führungsfläche und die Kühlmittelkanäle aus einem Strangpressprofil erzeugbar sind. Dabei sind die Kühlmittelkanäle integrierter Bestandteil der Rückseite der Führungsfläche. Aufgrund fehlender Wärmeübergangswiderstände zwischen Leitfläche und Kühlmittelkanälen ist der Kühleffekt hoch. Das Strangpressprofil weist eine hohe Biegesteifigkeit auf.
Nachteilig an dieser Lösung ist es, dass die Wärmeableitung dabei vorrangig nur über die der Führungsfläche zugewandten Seiten der Kühlmittelkanäle stattfindet. Die Wärme wird darüber hinaus in den Zonen zwischen den Kühlmittelkanälen weniger intensiv abgeführt, so dass innerhalb der Leitfläche große Temperaturgradienten vorhanden sind. Weiterhin ist zwischen den Kanälen nur geringer Freiraum für die Anordnung von Öffnungen für Saug- bzw. Blasluft vorhanden.From the DE 198 42 740 C2 is a pneumatic sheet guiding device with a cooled guide surface and with Blasluftöffnungen in the guide surface for supporting the sheet promotion known, in which the guide surface and the coolant channels can be produced from an extruded profile. The coolant channels are an integral part of the back of the guide surface. Due to the lack of heat transfer resistances between the guide surface and the coolant channels, the cooling effect is high. The extruded profile has a high bending stiffness.
A disadvantage of this solution is that the heat dissipation takes place primarily only on the sides of the coolant channels facing the guide surface. The heat is also less intensively dissipated in the zones between the coolant channels, so that within the guide surface large temperature gradients are present. Furthermore, there is only little free space between the channels for the arrangement of openings for suction or blowing air.

Der Erfindung liegt daher die Aufgabe zugrunde, ausgehend von den genannten Nachteilen des Standes der Technik eine Bogenleiteinrichtung mit optimaler Wärmeableitung zu schaffen, die eine hohe Flexibilität bei der Anpassung an pneumatische Bedruckstoffführungsmittel aufweist.The invention is therefore based on the object to provide, starting from the disadvantages of the prior art, a sheet guide with optimum heat dissipation, which has a high flexibility in the adaptation to pneumatic Bedruckstoffführungsmittel.

Erfindungsgemäß wird die Aufgabe durch eine Leiteinrichtung mit den Merkmalen des ersten Anspruchs gelöst. Weiterbildungen sind Gegenstand der Unteransprüche.According to the invention the object is achieved by a guide with the features of the first claim. Further developments are the subject of the dependent claims.

Die erfindungsgemäße Lösung hat den Vorteil, dass der Leitflächenquerschnitt so gestaltet ist, dass die abzuführende Wärme von allen Seiten möglichst gleichmäßig an die Kühlmittelkanäle herangeführt wird und die Wärmestromdichten über den gesamten Querschnitt annähernd gleich sind. Dadurch wird bei wirtschaftlichem Materialeinsatz eine gleichmäßige Wärmeableitung zu den Kühlmittelkanälen erreicht. Gleichzeitig können den Bedruckstoff schädigende Temperaturspitzen innerhalb der Leitfläche vermieden werden. Die erfindungsgemäße Leiteinrichtung hat weiterhin den Vorteil, im Vergleich zum bekannten Stand der Technik mit größeren Abständen der Kühlmittelkanäle auszukommen, so dass die Anpassung der Leitfläche an die Bogenbahn bzw. an erforderliche pneumatische Bogenführungsaufgaben bedeutend vereinfacht wird.The solution according to the invention has the advantage that the guide surface cross section is designed so that the dissipated heat is brought as evenly as possible to the coolant channels from all sides and the heat flux densities over the entire cross section are approximately equal. As a result, a uniform heat dissipation to the coolant channels is achieved with economic material use. At the same time, the printing material can be prevented from damaging temperature peaks within the guide surface. The guide according to the invention also has the advantage of getting along with larger distances of the coolant channels in comparison to the known prior art, so that the adaptation of the guide surface to the sheet web or to required pneumatic sheet guiding tasks is significantly simplified.

Die großen Materialquerschnitte der erfindungsgemäßen Leiteinrichtung bewirken eine hohe Biegesteifigkeit und damit geringe Verwerfungen bei geringer Bauhöhe.The large material cross-sections of the guide according to the invention cause a high bending stiffness and thus low distortions at low height.

Die Erfindung soll an Ausführungsbeispielen näher erläutert werden. Die dazugehörigen Zeichnungen zeigen:

Figur 1
Darstellung eines Querschnittes durch eine Leitfläche mit den integrierten Kühlkapillaren
Figur 2
Darstellung einer zweiten Variante des Leitflächenquerschnittes für die Kombination mit pneumatischen Bedruckstoffführungsmitteln
Figur 3
Darstellung einer dritten Variante mit benachbartem Vor- und Rücklauf der Kühlkapillaren in jeder Querschnittserweiterung und mit gekrümmter Leitfläche
Figur 4
schematische Darstellung der Kühlmittelverteiler mit Anordnung an den Leitflächen
Figur 5
Darstellung der Kühlmittelverteiler mit Rohrverbindungen zur Leitfläche
The invention will be explained in more detail in exemplary embodiments. The accompanying drawings show:
FIG. 1
Representation of a cross section through a guide surface with the integrated cooling capillaries
FIG. 2
Representation of a second variant of the Leitflächenquerschnittes for combination with pneumatic Bedruckstoffführungsmitteln
FIG. 3
Representation of a third variant with adjacent flow and return of the cooling capillaries in each cross-sectional widening and with curved guide surface
FIG. 4
schematic representation of the coolant distributor with arrangement at the guide surfaces
FIG. 5
Representation of the coolant distributor with pipe connections to the guide surface

In Druckmaschinen sind zur Unterstützung des Trocknungsprozesses, insbesondere nach Lackwerken und im Auslagebereich von Bogendruckmaschinen, Trockner entlang des Bogenweges angeordnet. Zur Sicherung definierter Abstände der Bedruckstoffoberfläche vom Trockner sind im Wirkungsbereich der Trockner diesen gegenüberliegende Bedruckstoffleiteinrichtungen angeordnet, die den Bedruckstoff auf ebenen oder gekrümmten Leitflächen führen. Infolge der Wärmestrahlung der Trockner kommt es zur unerwünschten Erwärmung der Leitflächen.In printing presses, driers are arranged along the sheet path to support the drying process, in particular after coating units and in the delivery area of sheet-fed printing machines. To ensure defined distances of the substrate surface from the dryer these opposite Bedruckstoffleiteinrichtungen are arranged in the area of action of the dryer, which lead the substrate on flat or curved guide surfaces. As a result of the heat radiation of the dryer, there is an undesirable heating of the guide surfaces.

Zur Wärmeableitung weist die Leitfläche 1 parallele, Kühlmittel durchströmte Kanäle auf. Die Leitfläche 1 mit den integrierten Kühlmittelkanälen 3 ist in einem Stück herstellbar, vorzugsweise nach dem Strangpressverfahren aus Aluminiumlegierungen, wobei mehrere Leitflächenmodule zu einer größeren Leitfläche kombinierbar sind. Die Kühlmittelkanäle 3 sind quer zur Transportrichtung des Bedruckstoffes angeordnet. Die bedruckstoffführende Oberfläche 2 der Leitfläche 1 ist glatt ausgeführt und kann zur Unterstützung der Abschmierfreiheit mit farbabstoßenden Beschichtungen ausgestattet sein.For heat dissipation, the guide surface 1 has parallel channels through which coolant flows. The guide surface 1 with the integrated coolant channels 3 can be produced in one piece, preferably after the extrusion of aluminum alloys, wherein a plurality of Leitflächenmodule can be combined to form a larger guide surface. The coolant channels 3 are arranged transversely to the transport direction of the printing material. The printing material-carrying surface 2 of the guide surface 1 is smooth and can be equipped to support Abschmierfreiheit with ink-repellent coatings.

Zur Erzeugung einer beliebigen Leitflächenkrümmung können die Strangpressprofile mit entsprechenden Pressmatrizen mit der gewünschten Krümmung hergestellt oder nachträglich unter Erwärmung umgeformt werden.In order to produce any desired surface curvature, the extruded profiles can be produced with appropriate pressing dies with the desired curvature or subsequently formed with heating.

Wie aus der Figur 1 ersichtlich, ist das Querschnittsprofil der Leitfläche 1 durch sich in Richtung auf die Kühlmittelkanäle 3 kontinuierlich erweiternde Materialquerschnitte gekennzeichnet, die im Bereich der Kühlmittelkanäle 3 auf der der bedruckstoffführenden Oberfläche 2 der Leitfläche 1 zugewandten und auf der von ihr abgewandten Seite der Kühlmittelkanäle 3 annähernd gleich sind. Der Querschnitt der Leitfläche 1 senkrecht zur bedruckstoffführenden Oberfläche 2 nimmt mit zunehmendem Abstand von den Kühlmittelkanälen 3 ab.Like from the FIG. 1 can be seen, the cross-sectional profile of the guide surface 1 is characterized by in the direction of the coolant channels 3 continuously expanding material cross-sections which are approximately equal in the region of the coolant channels 3 on the printing material-carrying surface 2 of the guide surface 1 and facing away from her side of the coolant channels 3 , The cross-section of the guide surface 1 perpendicular to the printing material-carrying surface 2 decreases with increasing distance from the coolant channels 3.

Symmetrisch zwischen den Kühlmittelkanälen 3 befindet sich die Zone mit dem geringsten Materialquerschnitt. Die Kühlmittelkanäle 3 durchziehen die Leitfläche 1 annähernd mittig in den Bereichen mit den jeweils größten Querschnitten. Die Kühlmittelkanäle 3 haben mit ca. 4-10 mm wesentlich geringere Durchmesser als bekannte Kanäle und werden deshalb im Folgenden idealisierend als Kühlkapillaren 3 bezeichnet.Symmetrically between the coolant channels 3 is the zone with the smallest material cross-section. The coolant channels 3 pass through the guide surface 1 approximately centrally in the areas with the respective largest cross sections. The coolant channels 3 have substantially smaller diameters of about 4-10 mm than known channels and are therefore referred to below as cooling capillaries 3 in an idealized manner.

In dem Maße, in dem der wärmeleitende Querschnitt vergrößert wird, kann die Länge des Wärmeableitweges vergrößert werden, ohne dass der Wärmeleitwiderstand ansteigt. Dies ermöglicht, den Abstand zwischen den Kühlkapillaren 3 vergrößern zu können, ohne schädliche Temperaturdifferenzen innerhalb des Profils in Kauf zu nehmen. Durch Parallelschalten der Kühlkapillaren 3 können ausreichende Kühlleistungen schon bei Durchmessern von ca. 6 mm erreicht werden, wobei optimale Kapillarabstände ca. 90 mm betragen. Kleine Kanaldurchmesser und große Abstände bedeuten einen großen Gestaltungsspielraum beim Einbringen von Öffnungen und Düsen 5 zur Unterstützung der Bedruckstoffführung, so dass fast beliebige Anordnungen realisierbar sind.As the thermally conductive cross section is increased, the length of the heat dissipation path can be increased without increasing the thermal resistance. This makes it possible to increase the distance between the cooling capillaries 3, without accepting harmful temperature differences within the profile. By paralleling the cooling capillaries 3, sufficient cooling capacities can be achieved even at diameters of about 6 mm, with optimum capillary distances being about 90 mm. Small channel diameters and large distances mean a great deal of freedom in the introduction of openings and nozzles 5 to support the printing substrate, so that almost any arrangement can be realized.

Der Leitflächenquerschnitt erweitert sich in einer ersten Variante auf der Leitflächenunterseite annähernd linear in Richtung auf die Kühlkapillaren 3, so dass mit dreiseitigen Prismen vergleichbare Verstärkungen der Leitfläche 1 gebildet werden, in deren Längsachsen die Kühlkapillaren 3 verlaufen. In einer anderen Variante können die Querschnittserweiterungen 4 sinusförmig sein, so dass eine wellenförmige Leitflächenunterseite ausgebildet wird.In a first variant, the baffle cross section widens approximately linearly in the direction of the cooling capillaries 3 on the baffle underside, so that reinforcements of the baffle surface 1 comparable to three-sided prisms are formed in whose longitudinal axes the cooling capillaries 3 run. In another variant, the cross-sectional enlargements 4 may be sinusoidal, so that a wave-shaped Leitflächenunterseite is formed.

Die zweite Variante (Fig. 2) der erfindungsgemäßen Leitfläche 1 ist durch streifenförmige Zonen mit konstantem Querschnitt zwischen den Kühlkapillaren 3 gekennzeichnet. In diesen Zonen weist die Leitfläche die geringste Materialstärke auf. Diese Zonen sind für Luftöffnungen 5 für pneumatische Bogenführungsmittel vorgesehen. Werden die Leiteinrichtungen mit Luftkästen an ihrer Unterseite kombiniert, können die Leitflächen 1 zur Saug- oder Blasluftführung der Bedruckstoffe, beispielsweise von Papier- oder Kartonbogen, eingesetzt werden. Durch die durch die Leitfläche 1 hindurch tretenden Luftströme wird die Leitfläche 1 im Bereich der Luftöffnungen 5 zusätzlich gekühlt, so dass die Wärmeableitung zu den Kühlkapillaren 3 nicht durch hohe Materialquerschnitte forciert werden muss.
Eine zur Verringerung der Temperaturgradienten entlang der Kühlkapillaren 3 in der Leitfläche 1 vorteilhafte Variante bildet die Anordnung von seriell durchströmten Kühlkapillaren 3 mit entgegengesetzter Strömungsrichtung, d.h. von Kühlmittelvor- und -rücklauf, in jeder Querschnittserweiterung 4 (Fig.3).
Zur Kühlmitteleinspeisung in die Kühlkapillaren 3 dienen Kühlmittelverteiler 7 mit großem Strömungsquerschnitt, die jeweils eine Gruppe von Kühlkapillaren 3 parallel mit Kühlmittel versorgen. Die Kühlmittelverteiler 7 sind an den Stirnseiten der Leitfläche(n) 1 beiderseits des Transportweges des Bedruckstoffes angeordnet und mit den Kühlkapillaren 3 direkt über Rohrverbindungselemente verbunden (Fig.4) oder sie befinden sich an von den Leitflächen 1 entfernten Orten und sind mit starren oder flexiblen Rohrverbindungen 8 mit den Kühlkapillaren 3 gekoppelt (Fig. 5). Die letztere Variante ist für eine erhöhte Flexibilität bei der Leitflächenanordnung, z.B. bei gekrümmter Leitfläche 1, zur Bedruckstoffumlenkung oder aus Zugänglichkeitsgründen vorteilhaft. Die Kühlmittelverteiler 7 besitzen mittlere oder endseitige Zu- und Abläufe für das Kühlmittel.
Insbesondere bei der Kombination mehrerer Leitflächen 1 zu einer größeren Leiteinrichtung können die einzelnen Leitflächen 1 stirnseitig auf Schienen mit Ausnehmungen für die Querschnittserweiterungen 4 der Leitflächen 1 gelagert sein und mit U-förmigen seitlichen Verkleidungen zum Schutz vor Verbrennungen versehen sein. Leitflächen 1 für größere Bedruckstoffbreiten werden mit zusätzlichen Tragelementen mittig abgestützt. Um zu verhindern, dass bei der Kombination von mehreren Leitflächenmodulen zu einer pneumatischen Bedruckstoffleiteinrichtung zwischen den angrenzenden Seitenflächenmodulen Luft unerwünscht ein- oder ausströmt, sind die Leitflächen 1 an beiden Seiten mit ineinander greifenden bzw. überlappenden Abdichtprofilen 6 ausgestattet (Fig.1, 2).The second variant ( Fig. 2 ) of the guide surface 1 according to the invention is characterized by strip-shaped zones of constant cross-section between the cooling capillaries 3. In these zones, the guide surface has the lowest material thickness. These zones are provided for air openings 5 for pneumatic sheet guiding means. If the diffusers combined with air boxes on their underside, the guide surfaces 1 for suction or Blasluftführung the substrates, such as paper or cardboard sheets, can be used. As a result of the air streams passing through the guide surface 1, the guide surface 1 is additionally cooled in the region of the air openings 5, so that the heat dissipation to the cooling capillaries 3 does not have to be forced through high material cross sections.
A variant which is advantageous for reducing the temperature gradients along the cooling capillaries 3 in the guide surface 1 forms the arrangement of cooling capillaries 3 flowed through in series with an opposite flow direction, ie of the coolant supply and return, in each cross-sectional widening 4 (FIG. Figure 3 ).
For coolant supply into the cooling capillaries 3 are coolant distributor 7 with a large flow cross-section, each supplying a group of cooling capillaries 3 in parallel with coolant. The coolant distributors 7 are arranged on the end faces of the guide surface (s) 1 on both sides of the transport path of the printing substrate and connected directly to the cooling capillaries 3 via pipe connecting elements ( Figure 4 ) or are located at locations remote from the guide surfaces 1 and are coupled to the cooling capillaries 3 by means of rigid or flexible pipe connections 8 ( Fig. 5 ). The latter variant is advantageous for increased flexibility in the guide surface arrangement, for example in the case of a curved guide surface 1, for deflecting the substrate or for reasons of accessibility. The coolant distributors 7 have medium or end feeds and outlets for the coolant.
In particular, in the combination of multiple fins 1 to a larger guide, the individual fins 1 may be mounted on the front side rails with recesses for the cross-sectional extensions 4 of the fins 1 and be provided with U-shaped side panels for protection against burns. Guide surfaces 1 for larger substrate widths are supported centrally with additional support elements. In order to prevent air from undesirably flowing in or out between the adjacent side-surface modules when a plurality of guide surface modules are combined to form a pneumatic printing material guide, the guide surfaces 1 are provided on both sides with interlocking or overlapping sealing profiles 6 (FIG. Fig.1 . 2 ).

Zur Wirkungsweise der erfindungsgemäßen Leiteinrichtung:
Bei den bekannten Lösungen ist der Wärmeleitwiderstand zwischen der dem Trockner zugewandten Oberseite der Leitfläche und der Oberseite der Kühlmittelkanäle aufgrund des höheren Materialquerschnittes wesentlich geringer ist als zwischen Leitfläche und der Rückseite der Kühlmittelkanäle. Wärme, die auf die Rückseite des Kanals geleitet werden soll, muss eine wesentlich längere Strecke überwinden, wobei der geringe Materialquerschnitt der Kanalwandung zusätzlich als "Nadelöhr" wirkt. Die Unterseite des Kühlmittelkanals ist somit als Wärmeaustauschfläche praktisch wirkungslos. Erfindungsgemäß wird nun dem Wärmestrom 10 durch große Materialquerschnitte ein möglichst widerstandsarmer Weg zur Unterseite der Kühlmittelkapillare 3 ermöglicht, wobei infolge der geringen Kanalabmessungen auch keine nennenswerten Wegunterschiede zwischen Kanaloberseite und Kanalunterseite vorhanden sind.
Die annähernd gleichen Materialdicke zwischen Kanaloberseite und Leitfläche 1 sowie zwischen Kanalunterseite und Leitflächenunterseite gewährleistet, dass die Wärmeleitwiderstände, die vom leitenden Querschnitt und der Länge des leitenden Querschnittes bestimmt werden, zwischen Leitfläche 1 und Oberseite der Kühlmittelkapillare 3 sowie zwischen Leitfläche 1 und Unterseite der Kühlmittelkapillare 3 annähernd gleich sind, so dass die gesamte Kühlmittelkanaloberfläche am Wärmeaustausch beteiligt ist. Die zusätzliche thermische Ankopplung der Kanalunterseiten hat den wesentlichen Vorteil, dass der Querschnitt der Kühlmittelkapillare 3 bei gleicher Kühlwirkung wesentlich kleiner als bisher bekannte Kühlmittelkanäle gewählt werden kann.
Mit zunehmendem Oberflächenanteil wächst auch der aufgenommene Wärmestrom 10 in Richtung auf die Kühlmittelkapillare 3. Durch die damit korrelierende zunehmende Wandstärke des Leitflächenprofils bleibt das Verhältnis zwischen Wärmestrom 10 und wärmeübertragender Querschnittsfläche und damit die Wärmestromdichte konstant. Dadurch ist die Temperaturverteilung aufgrund der annähernd konstanten Wärmestromdichte wesentlich gleichmäßiger als bei bekannten Leitflächen mit einseitig daran angeordneten Kühlmittelkanälen, was zur Reduzierung von Temperaturspitzen und geringeren Verwerfungen der Leitfläche 1 führt.
Die Anordnung der Kühlkapillaren 3 quer zur Transportrichtung des Bedruckstoffes ermöglicht eine bessere Regelbarkeit der Temperatur durch zonenweise Anpassung der Kühlleistung in Transportrichtung entsprechend der von den Trocknern abgestrahlten Wärmestrahlung 9.
Mit der benachbarten Anordnung von Kühlkapillaren 3 gem. Fig. 3 mit entgegengesetzter Strömungsrichtung, d.h. von Kühlmittelvor- und -rücklauf auf derselben Seite der Bogenbahn, wird eine Temperaturdifferenz auf der Leitfläche 1 in Strömungsrichtung des Kühlmittels vermieden, weil die anfänglich hohe Kühlwirkung an der Kühlmitteleintrittsstelle durch die geringe Kühlwirkung an der Kühlmittelaustrittsstelle, kompensiert wird.
Um eine gleichmäßige parallele Durchströmung der Kühlkapillaren 3 zu erzielen, ist es erforderlich, den Druckabfall in den Kühlmittelverteilern 7 im Kühlmittelvor- und -rücklauf klein zu halten gegenüber dem Druckabfall in den Kühlmittelkapillaren 3. Dies wird problemlos durch Wahl entsprechend großer Verteilerquerschnitte sichergestellt. Kombiniert man die Kühlkapillaren 3 mit Vor- und Rücklauf- Kühlmittelverteilern 7 , welche mittige Einspeisungen besitzen, so werden auch weit von der Einspeisung entfernte Kühlkapillaren 3 ausreichend mit Kühlmittel versorgt.
Die Leiteinrichtung ist vorzugsweise in Bogenoffsetrotationsdruckmaschinen einsetzbar.For the operation of the guide according to the invention:
In the known solutions, the thermal resistance between the dryer facing top of the guide surface and the top of the coolant channels due the higher material cross-section is substantially less than between the guide surface and the back of the coolant channels. Heat, which should be directed to the back of the channel, must overcome a much longer distance, the small material cross-section of the channel wall also acts as a "bottleneck". The underside of the coolant channel is thus practically ineffective as a heat exchange surface. According to the invention, the heat flow 10 is made possible by means of large material cross sections as low as possible path to the underside of the coolant capillary 3, and due to the small channel dimensions also no significant path differences between the channel top and channel bottom are present.
The approximately same material thickness between the upper side of the channel and the guide surface 1 and the underside of the guide surface ensures that the thermal resistances, which are determined by the conductive cross section and the length of the conductive cross section, between the guide surface 1 and the upper side of the coolant capillary 3 and between the guide surface 1 and the underside of the coolant capillary 3 are approximately equal, so that the entire coolant channel surface is involved in the heat exchange. The additional thermal coupling of the channel bottoms has the significant advantage that the cross section of the coolant capillary 3 can be selected much smaller than previously known coolant channels with the same cooling effect.
As the surface area increases, the absorbed heat flow 10 also increases in the direction of the coolant capillary 3. As a result of the increasing wall thickness of the guide surface profile correlating therewith, the ratio between the heat flow 10 and the heat-transmitting cross-sectional area and therefore the heat flow density remains constant. As a result, the temperature distribution due to the approximately constant heat flux density is much more uniform than in known guide surfaces with coolant channels arranged on one side, which leads to the reduction of temperature peaks and lower distortions of the guide surface 1.
The arrangement of the cooling capillaries 3 transversely to the transport direction of the printing material allows a better controllability of the temperature by zone-wise adjustment of the cooling capacity in the transport direction according to the heat radiation emitted by the dryers. 9
With the adjacent arrangement of cooling capillaries 3 gem. Fig. 3 with opposite flow direction, ie of Kühlmittelvor- and -rücklauf on the same side of the arc, a temperature difference on the guide surface 1 in the flow direction of the coolant is avoided, because the initially high cooling effect at the coolant entry point is compensated by the low cooling effect at the coolant exit point.
In order to achieve a uniform parallel flow through the cooling capillaries 3, it is necessary to reduce the pressure drop in the coolant distributors 7 in the coolant supply and return To keep small compared to the pressure drop in the coolant capillaries 3. This is easily ensured by choosing correspondingly large distribution cross sections. Combining the cooling capillaries 3 with supply and return coolant distributors 7, which have central feeds, as well as far away from the feed cooling capillaries 3 are sufficiently supplied with coolant.
The guide is preferably used in Bogenoffsetrotationsdruckmaschinen.

Aufstellung der verwendeten BezugszeichenList of used reference numbers

11
Leitflächebaffle
22
bedruckstoffführende Oberflächeprinting material-carrying surface
33
Kühlmittelkanal, KühlkapillareCoolant channel, cooling capillary
44
QuerschnittserweiterungCross-sectional widening
55
Luftöffnungair opening
66
Abdichtprofilsealing profile
77
KühlmittelverteilerCoolant distributor
88th
Rohrverbindungpipe connection
99
Wärmestrahlungthermal radiation
1010
Wärmestromheat flow

Claims (7)

  1. Guide device for printing materials in the operative region of dryers, consisting of at least one guide surface (1) disposed in functional connection with a coolant system, wherein the guide surface (1) is producible from an extruded section,
    - with parallel cooling capillaries (3) integrated in the guide surface (1) and flowed through by coolant,
    - with a cross-section perpendicular to the surface (2), which guides printing material and which is adapted to the heat flow (10) to be dissipated by the thermally loaded guide surface (1),
    - approximately central arrangement of the cooling capillaries (3) in the regions with the respectively largest cross-sections (4) of the guide surface (1) and
    - with an arrangement of the cooling capillaries (3) transversely to the transport direction of the printing material,
    characterised in that
    - the cross-section perpendicular to the surface (2) guiding printing material decreases with increasing spacing from the cooling capillaries (3).
  2. Guide device according to claim 1, with lateral coolant distributors (6) connecting the cooling capillaries (3) of the guide surface (1) in groups parallelly with coolant outward and return runs, wherein the coolant distributors (7) have a substantially larger flow cross-section for the coolant than the cooling capillaries (3) and are arranged directly at the ends of the guide surfaces (1) or connected by way of tube ducts (8) with the cooling capillaries (3).
  3. Guide device according to claim 1, wherein in each instance two cooling capillaries (3) flowed through in series are arranged with opposite flow direction at a small spacing from one another in the regions with the respectively largest cross-sections (4) of the guide surface.
  4. Guide device according to any one of claims 1 to 3, wherein the guide surface (1) has between the cooling capillaries (3) a respective central zone with a constant cross-section for air openings (5).
  5. Guide device according to any one of claims 1 to 4, wherein the guide surface (1) is curved in the transport direction of printed material.
  6. Guide device according to claim 1, wherein the diameter of the cooling capillaries (3) is 4 to 10 millimetres.
  7. Sheet printing machine with at least one guide device according to any one of claims 1 to 6.
EP05012938A 2004-07-02 2005-06-16 Guiding device for printed materials Not-in-force EP1621498B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004032111A DE102004032111A1 (en) 2004-07-02 2004-07-02 Control equipment for sheet fed printing machine, has capillaries parallel to control surface, where coolant flows through capillaries and cross section of surface is formed such that dissipated heat is provided to coolant channels

Publications (3)

Publication Number Publication Date
EP1621498A2 EP1621498A2 (en) 2006-02-01
EP1621498A3 EP1621498A3 (en) 2007-02-21
EP1621498B1 true EP1621498B1 (en) 2011-08-10

Family

ID=35185118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05012938A Not-in-force EP1621498B1 (en) 2004-07-02 2005-06-16 Guiding device for printed materials

Country Status (3)

Country Link
EP (1) EP1621498B1 (en)
AT (1) ATE519703T1 (en)
DE (1) DE102004032111A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2512238B (en) 2012-05-09 2019-11-27 Security Printing Inst Of Peoples Bank Of China A combined printing apparatus
CN114162656B (en) * 2021-01-28 2023-12-08 河南印都数码科技有限公司 Movable cooling paper receiving device with high degree of adhesion with main shaft

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9310028U1 (en) * 1993-07-06 1993-11-04 Kba-Planeta Ag, 01445 Radebeul Media cooling in cantilevers of sheet-fed rotary printing machines
DE9418358U1 (en) * 1994-11-17 1995-02-23 L.T.S.-Trocknungsverfahren GmbH, 65719 Hofheim Sheet guiding device
DE19651406C1 (en) * 1996-12-11 1998-06-10 Roland Man Druckmasch Dryer unit in a printing press
DE19842740C2 (en) * 1998-09-18 2002-11-07 Roland Man Druckmasch Pneumatic sheet guiding device in a printing machine
DE29816734U1 (en) * 1998-09-18 1998-12-03 MAN Roland Druckmaschinen AG, 63075 Offenbach Pneumatic sheet guiding device in a printing machine
US6722608B1 (en) * 1999-10-28 2004-04-20 Segway Systems, Llc Porous air bearings for tape transports and method of fabrication thereof
DE10049809B4 (en) * 1999-10-28 2014-02-13 Heidelberger Druckmaschinen Ag Guide device for a sheet-like substrate
DE10144159A1 (en) * 2001-09-08 2003-03-27 Koenig & Bauer Ag Sheet guide in printer delivery systems has grippers, cooling box with sheet guide-plate with openings in and ventilators

Also Published As

Publication number Publication date
EP1621498A3 (en) 2007-02-21
DE102004032111A1 (en) 2006-01-19
EP1621498A2 (en) 2006-02-01
ATE519703T1 (en) 2011-08-15

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