EP1551634A1 - Secheur pour bande de matiere - Google Patents

Secheur pour bande de matiere

Info

Publication number
EP1551634A1
EP1551634A1 EP03808666A EP03808666A EP1551634A1 EP 1551634 A1 EP1551634 A1 EP 1551634A1 EP 03808666 A EP03808666 A EP 03808666A EP 03808666 A EP03808666 A EP 03808666A EP 1551634 A1 EP1551634 A1 EP 1551634A1
Authority
EP
European Patent Office
Prior art keywords
material web
section
channel
web
dryer
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Withdrawn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
EP03808666A
Other languages
German (de)
English (en)
Inventor
Georg Schneider
Wolfgang Otto Reder
Karl Erich Albert Schaschek
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.)
Koenig and Bauer AG
Original Assignee
Koenig and Bauer AG
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 Koenig and Bauer AG filed Critical Koenig and Bauer AG
Publication of EP1551634A1 publication Critical patent/EP1551634A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B41F23/0403—Drying webs
    • B41F23/0423—Drying webs by convection
    • B41F23/0426—Drying webs by convection using heated air

Definitions

  • the present invention relates to dryers for a material web according to the preamble of claim 1 or 2.
  • Drying devices for drying a freshly printed material web are e.g. B. from DE 41 33 555 A1 or DE 4429891 A1.
  • DE 41 33 555 A1 describes an intaglio printing machine with several printing rollers for multi-color printing, in which a material web, after passing through each individual printing roller, passes through a transport path deflected on several rollers, on which drying devices are arranged.
  • the course of the transport path is chosen so that the first deflection rollers, which pass the material web after passing through a printing nip, touch the unprinted rear side of the web. Only when the web has passed the drying facilities and there is no longer any risk of ink smearing due to contact with a deflection roller, do deflection rollers follow, which also touch the printed surface of the web.
  • the construction known from DE 41 33 555 A1 cannot be used in printing machines for double-sided printing, since contact of the freshly printed web with a deflecting roller or any other surface should be avoided as long as the printing ink has not dried completely.
  • DE 4429 891 A1 therefore uses an elongated drying oven for drying a web printed on the front and back, through which the web runs in a straight line. It would be desirable per se to be able to guide the web vertically upwards through the drying oven in the same direction in which it emerges from the printing unit, so as to avoid the web, which has not yet completely dried, coming into contact with a deflection roller. However, such an arrangement would reach a height of many meters. Such a machine would therefore be difficult to accommodate in a hall. In order to avoid this and to be able to install the drying oven horizontally, a deflection roller between the outlet of the printing unit and the entrance of the drying oven is accepted.
  • DE 10044676 A1 and DE 4033 642 A1 show devices for deflecting a material web by means of compressed air.
  • the invention has for its object to provide dryers for a material web.
  • the dryer can be built very compactly and does not have or require deflection rollers that come into contact with the material web before it is completely dried.
  • This is achieved by using curved deflection surfaces provided with air outlet openings on the through-channel of the dryer instead of deflection rollers.
  • the deflecting surface In order to produce a uniform air cushion between the deflecting surface and the material web, it is desirable for the deflecting surface to have a radius of curvature which is variable in the web running direction, which is minimal at an apex line of the deflecting surface and increases in each case towards the edges of the deflecting surface.
  • a deflection surface can in particular have a hyperbolic cross section (in particular at a deflection angle of 90 °) or a semi-elliptical cross section.
  • Air outlet openings are preferably arranged along the apex line of the deflection surface.
  • a material web to be dried can be dried with the aid of a plurality of such deflection surfaces can be guided in a compact volume over a long length, so that long dwell times in the dryer can be achieved even at high web speeds.
  • the dryer preferably has heat sources arranged on the through-channel, e.g. B. in the form of heat radiators.
  • the drying effect can also be intensified by air movement, which is why air outlet nozzles which are aligned with the material web are expediently provided on the at least one rectilinear section of the through-channel.
  • air outlet nozzles can advantageously be assigned a heating device in a supply line for the nozzles, for heating the air exiting through them.
  • the heating device can in particular be a burner.
  • a heater is preferably provided in the supply line of the nozzles of at least one section located upstream in the direction of travel of the material web, while in the supply line of the nozzles at least one section is located downstream in the direction of travel of the material web located section such a heater is missing. While the material web is thus heated in the upstream section and thus drying is intensified, the downstream section enables the material web to cool rapidly.
  • a pressure pump can be arranged on a supply line of the nozzles; instead of or in addition, it is also conceivable to provide a suction pump for generating a negative pressure in the through-channel.
  • a vacuum facilitates drying by lowering the boiling temperature of the color components to be evaporated; it can also serve to drive airflow through the nozzles.
  • the through-channel preferably has at least two sections through which the material web runs in opposite directions.
  • a first section preferably runs from an inlet of the dryer over a first distance in a first direction and a section adjoining it via a deflection surface runs over a second distance that is greater than the first in the opposite direction.
  • the dryer thus extends from the entrance in two opposite directions, which simplifies the assembly of the dryer on a printing unit, even if the dryer protrudes beyond the printing unit in said direction or in the opposite direction.
  • 1 and 2 are schematic sections through a deflection surface for contactless deflection of a material web
  • FIG. 3 shows a basic diagram of a dryer
  • Fig. 1 shows a schematic section through a deflection surface 01, hereinafter also referred to as air saddle 01, for deflecting a material web 07, z. B. paper web 07 at an angle of 180 °.
  • the air saddle 01 has a housing 02 that extends in the transverse direction of the material web 07 (the direction perpendicular to the plane of the drawing) an ellipse halved along its short diameter.
  • the housing 02 can, for. B. consist of a steel sheet, a rigid plastic plate or the like.
  • the cross section of the housing 02 is symmetrical with respect to a plane A, which intersects the housing 02 along an apex line 03.
  • the housing 02 is provided with a plurality of air outlet openings 04, which communicate with a compressed air channel 06, which extends inside the housing 02 in the longitudinal direction thereof.
  • Compressed air emerging from the air outlet openings 04 is distributed between the housing 02 and a material web 07 wrapped around the housing 02 and thus forms an air cushion which keeps the material web 07 spaced from the surface of the housing 02.
  • the overpressure between the housing 02 and the material web 07 required to maintain an air cushion with a thickness of typically 0.3 to 0.5 mm is a function of the tension of the material web 07.
  • Pressure sensors on the surface of the material web 07 wrapped around it can therefore be used Housing 02 or also in the compressed air duct 06 can be provided, on the basis of whose measured values the web tension can be controlled and, if the detected pressure indicates a web break or other error, an emergency stop of a machine which contains the deflection surface can be initiated.
  • FIG. 2 shows a section analogous to that of FIG. 1 through an air saddle 01 with a 90 ° deflection angle.
  • the principle of operation is the same as for the air saddle 01 from FIG. 1; Air emerging through the compressed air channel 06 and along an apex line 03 of the housing 02 air outlet openings 04 is distributed between the surface of the housing 02 and a material web 07 wrapping around it and thus produces an air cushion that enables an essentially frictionless conveyance of the material web 07.
  • a half-air saddle could also have an asymmetrical cross section.
  • the apex line 03 of the housing 02 is defined as that line on the surface of the housing 02 which touches an imaginary plane which, based on the sum F ⁇ of the tensile force vectors F v acting on the material web 07 in front of and behind the deflection surface 01; F R is vertical. This arrangement minimizes the air throughput of the deflection surface required to build up an air cushion.
  • FIG. 3 shows a schematic of an air saddle 11; 12; 13 equipped according to FIGS. 1 and 2 dryer.
  • a material web 07 to be dried is on a peripheral surface 11, for. B. an air saddle 11, for. B. an input air saddle 11 deflected by 90 °, extends straight through a through channel 08, z. B. a gap 08, between two plates 14 provided with air outlet nozzles, wraps around a peripheral surface 12, z. B. an air saddle 12, for. B. a 180 ° air saddle 12, runs through a second gap 08 to a peripheral surface 13, z. B. air saddle 13, z. B. an output air saddle 13, and from there leaves the dryer in the horizontal direction.
  • the air saddles 11; 12; 13 must namely be supplied with a higher pressure than the chambers 16.
  • FIG. 4 shows a first exemplary embodiment of a dryer 22 mounted on a printing unit 21.
  • a through-channel for printed material web 07 coming vertically from below from the printing unit 21 comprises an air saddle 11, e.g. B. a 90 ° air saddle 11 and a horizontally oriented gap 08 between plates provided with air outlet nozzles 14.
  • the plates 14 form a housing which is essentially sealed except for the nozzles and an inlet and outlet slot for the material web 07, to which a suction pump 26 is connected in order to generate a negative pressure in the gap 08.
  • the negative pressure causes fresh air to flow into the gap 08 via supply lines 27, which here are formed by spaces between the plates 14 and an outer housing 28 of the dryer 22.
  • fresh air essentially flows in via an outlet 24 of the dryer 22, from which the material web 07 is led out.
  • the fresh air can be preheated by a heating device (not shown in FIG. 4).
  • the material web 07 emerging from the outlet 24 loops around a cooling roller 29 and finally reaches a folder 31.
  • the printing unit 21 is the same as in the embodiment of FIG. 4. It comprises two assemblies 32, 33, each of which contains plate cylinders printing on the same side of the material web 07, and which can be moved apart in a frame 34 in order to gain access to the To enable plate cylinders.
  • the housing 28 of the dryer 22 extends over the entire width of the frame 34.
  • the entrance 23 for the material web 07 is located approximately in the center on the underside of the housing 28.
  • a 90 ° air saddle 11 arranged on it directs the material web coming from the printing unit 21 07 into a first horizontal rectilinear section 36 of the through-channel of the dryer 22, which extends from the entrance 23 in a direction leading away from the folder 31.
  • the section 36 merges at a 180 ° air saddle 12 into a second horizontal rectilinear section 37, which leads the material web 07 in the opposite direction to an exit 24 adjacent to the folder 31. From there, the material web 07 runs over a cooling roller 29 to the folder 31.
  • the first section 36 is arranged only on one side of the plane 43, the second Section 37 is located on both sides of level 43.
  • the second section 37 is at least twice as long as the first section 36.
  • Sections 36; 37 of the through-channel 08 are each delimited here by baffles 38 which lead a fresh air stream penetrating at the outlet 24 into the housing 28 of the dryer 22 and driven by a pump (not shown) close to the material web 07.
  • the fresh air stream which in turn can be preheated, sweeps along the material web 07 at high speed and thus ensures effective drying.
  • the air is supplied to the straight sections 36; 37 as in the embodiment of FIG. 4 via chambers 39 separated from the through-channel by the guide plates 38 and nozzles formed in the guide plates 38.
  • FIG. 6 differs from that of FIG. 5 in that in the first section 36 of the through-channel 08 and in the half of the second section 37 which is remote from the folder 31, the guide plates 38 by arrangements of heat radiators 41, for. B. are replaced by electrically operated heating elements.
  • a pump (not shown) drives a fresh air stream which flows through the housing 28 of the dryer 22 from the outlet 24 to an air outlet 42 formed on an opposite end face of the housing 28.
  • the incoming fresh air does not need to be preheated in this embodiment, on the contrary, it is used in the right half of section 37 to cool the material web 07 in countercurrent, so that a cooling roller 29 between the dryer 22 and the folder 31 can be dispensed with.
  • FIG. 7 A configuration for high drying performance is shown in FIG. 7.
  • the sections of the passage channel 08 here designated 36.1 to 36.5, are surrounded by chambers 16.1 to 16.5, the wall plates of which facing the passage channel 08 are provided with air outlet nozzles.
  • a total of five sections are provided, the chambers 16.1; 16.2; 16.3 of the three sections 36.1 located upstream in the dryer 22 in relation to the transport direction of the material web 07; 36.2; 36.3 are supplied with hot gases from a burner and the chambers 16.4; 16.5 of the downstream sections 36.4; 36.5 are supplied with unheated fresh air in order to pre-cool the material web 07 before reaching a group of cooling rollers 29.
  • the performance of such a dryer 22 is sufficient for heatset drying.
  • the dryer 22 can be mounted on a printing unit 21 without increasing its space requirement or the required distance from other machines predestines the dryer 22 especially for retrofitting already installed newspaper printing presses. This creates the possibility of printing on such machines even higher-quality papers with a lower absorbency than conventional newsprint, in particular papers with a coated surface.
  • the field of application of such printing machines is expanded so that they can also be used at times of the day when no newspapers are to be printed. The cost-effectiveness of such a printing press can be increased considerably.

Abstract

L'invention concerne un sécheur servant à sécher une bande de matière (07). Ce sécheur comprend un canal de passage (08) à travers lequel passe la bande de matière et dans lequel le séchage est effectué, ce canal comprenant au moins une section rectiligne. Ledit sécheur est disposé sur un groupe d'impression (21) dans lequel la bande de matière est guidée verticalement, le canal de passage du sécheur comprenant au moins une section rectiligne dans laquelle la bande de matière en provenance du groupe d'impression est guidée horizontalement. Selon l'invention, le canal de passage comprend au moins deux sections (36, 37) parcourues par la bande de matière dans des directions opposées.
EP03808666A 2002-10-16 2003-07-09 Secheur pour bande de matiere Withdrawn EP1551634A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10248249 2002-10-16
DE10248249A DE10248249B4 (de) 2002-10-16 2002-10-16 Trockner für eine Materialbahn
PCT/DE2003/002296 WO2004035313A1 (fr) 2002-10-16 2003-07-09 Secheur pour bande de matiere

Publications (1)

Publication Number Publication Date
EP1551634A1 true EP1551634A1 (fr) 2005-07-13

Family

ID=32086945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03808666A Withdrawn EP1551634A1 (fr) 2002-10-16 2003-07-09 Secheur pour bande de matiere

Country Status (5)

Country Link
US (1) US7316184B2 (fr)
EP (1) EP1551634A1 (fr)
AU (1) AU2003250304A1 (fr)
DE (1) DE10248249B4 (fr)
WO (1) WO2004035313A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4730109B2 (ja) * 2005-03-28 2011-07-20 Ｔｄｋ株式会社 印刷乾燥方法、電子部品の製造方法および印刷乾燥装置
DE102005017152B4 (de) * 2005-04-13 2007-02-08 Lindauer Dornier Gmbh Verfahren zum Trocknen von vorzugsweise plattenförmigen Produkten und Durchlauftrockner in Mehretagenbauweise
DE102006025264A1 (de) * 2006-05-31 2007-12-06 Man Roland Druckmaschinen Ag Rollenrotationsdruckmaschine und ein Verfahren zum Betreiben einer solchen
US8348531B2 (en) * 2008-05-27 2013-01-08 Hewlett-Packard Development Company, L.P. Media treatment web flow path
US9530072B2 (en) * 2013-03-15 2016-12-27 Dropbox, Inc. Duplicate/near duplicate detection and image registration

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3093069A (en) * 1960-09-16 1963-06-11 Cottrell Company Automatic web tension control system
DE2322482A1 (de) 1972-05-10 1973-11-29 Waertsilae Oy Ab Druckmaschine
GB8611722D0 (en) * 1986-05-14 1986-06-25 Drg Uk Ltd Processing paper & other webs
DE4033642A1 (de) 1990-10-23 1992-04-30 Hoechst Ag Leitvorrichtung zum fuehren, aus- und/oder umlenken einer materialbahn
DE4133555C2 (de) 1991-10-10 1997-05-22 Schepers Hans Georg Vertikale Tiefdruckmaschine
DE4429891C2 (de) * 1994-08-24 2003-05-08 Koenig & Bauer Ag Mehrfarbenrollenrotationsdruckmaschine
JP2997924B2 (ja) * 1997-11-26 2000-01-11 株式会社東京機械製作所 タワー型多色印刷装置
DE29819202U1 (de) * 1998-10-28 1999-02-11 Vits Maschinenbau Gmbh Vorrichtung zum Trocknen und Kühlen frisch bedruckter Papierbahnen
US6176184B1 (en) * 1999-04-16 2001-01-23 Paper Converting Machine Company Dryer for flexographic and gravure printing
DE10044676C2 (de) * 2000-09-09 2002-08-01 Vits Maschinenbau Gmbh Wendestange
DE10236864B4 (de) * 2002-08-12 2007-02-01 Koenig & Bauer Ag Heatset-Druckmaschine
DE602004028553D1 (de) * 2003-07-24 2010-09-23 Miyakoshi Printing Mach Rotationsdruckmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004035313A1 *

Also Published As

Publication number Publication date
US7316184B2 (en) 2008-01-08
DE10248249B4 (de) 2006-06-01
AU2003250304A1 (en) 2004-05-04
DE10248249A1 (de) 2004-05-06
US20060021245A1 (en) 2006-02-02
WO2004035313A1 (fr) 2004-04-29

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