EP0438410B1 - Trocknerelement - Google Patents

Trocknerelement Download PDF

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Publication number
EP0438410B1
EP0438410B1 EP89906100A EP89906100A EP0438410B1 EP 0438410 B1 EP0438410 B1 EP 0438410B1 EP 89906100 A EP89906100 A EP 89906100A EP 89906100 A EP89906100 A EP 89906100A EP 0438410 B1 EP0438410 B1 EP 0438410B1
Authority
EP
European Patent Office
Prior art keywords
heating tube
reflector
element according
heating
drying element
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.)
Expired - Lifetime
Application number
EP89906100A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0438410A1 (de
Inventor
Hans G. Platsch
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT89906100T priority Critical patent/ATE85002T1/de
Publication of EP0438410A1 publication Critical patent/EP0438410A1/de
Application granted granted Critical
Publication of EP0438410B1 publication Critical patent/EP0438410B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41F23/0403—Drying webs
    • B41F23/0423—Drying webs by convection
    • B41F23/0426—Drying webs by convection using heated air
    • 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
    • B41F23/0406—Drying webs by radiation
    • B41F23/0413—Infrared dryers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection

Definitions

  • the invention relates to a dryer element for use in a printing press according to the preamble of claim 1, and to a dryer unit constructed from such dryer elements.
  • a dryer element according to the preamble of claim 1 is known from US-A-2 683 939.
  • the rod-shaped heating element is a conventional heating rod, which is located inside the heating tube and is in direct contact with the blown air to be heated.
  • Such an arrangement is suitable for heating the blown air when no great heat output has to be transferred to the blown air.
  • large amounts of very hot blown air are required so that the printed products are reliably dried on a short way before reaching the next printing station.
  • warm air dryer elements are preferred for drying water-based paints, such as those used in particular as a clear lacquer over the printing inks, in order to give the surface of the finished product a shine
  • infrared radiation radiation is preferred for drying conventional offset inks and for drying oil-based paints. Dryer elements use.
  • Such a combined dryer element is suitable for use with printing inks which respond to both radiation drying and warm air drying. However, if you only want to carry out warm air drying or radiation drying with such a dryer element, as would be advantageous for some applications, this is not possible.
  • UV radiation dryer elements are also used for special coatings and printing inks that contain prepolymerized plastic materials. UV drying does not require special measures on a larger scale because of the installation of very powerful UV lamps, but also from radiation protection and from the extraction of the ozone generated by the UV rays, so that appropriately equipped printing machines are always combined with UV drying will be busy.
  • the present invention is therefore intended to provide a dryer element which, with a very compact structure, enables the local production of warm blown air in large quantities, so that a blown air dryer unit constructed with it is so compact that a conventional IR dryer can be easily replaced with it .
  • a rod-shaped infrared radiator is used to provide a large heat output in a very compact volume. This heat output is first transferred to the blown air by absorption on a heating pipe running parallel to the infrared heater. The blown air to be heated is sent through this. The heating tube is in turn upstream of the blow molding, which emits the heated air.
  • a dryer element as stated in claim 2, is particularly short overall, since the heating tube and blow bar are kept within the same transverse limits with respect to the direction of conveyance of the printed products.
  • the development of the invention according to claim 3 is advantageous on the one hand in terms of avoiding eddies in the heating tube.
  • the convexly curved outer surface of the heating tube ensures that the heat rays striking the heating tube are not reflected back into the infrared radiator, which improves the effective heat flow from the infrared radiator to the heating tube.
  • a light funnel leading these rays to the heating tube surface can be accomplished with elements having a circular cross-section that are particularly easy to manufacture.
  • the development of the invention according to claim 9 is advantageous with regard to the supply of large amounts of heat to the heating tube with a compact construction of the dryer element.
  • the electrical installation and maintenance of the dryer element is also simplified by using a twin infrared heater.
  • the secondary air flow is also generated in the dryer element according to claim 11 according to the principle of a water jet pump without an additional fan.
  • the development of the invention according to claim 11 also has the further advantage that the outer housing is already at a low temperature, which is advantageous in terms of accident protection.
  • the development of the invention according to claim 12 is advantageous in terms of a strong and effective secondary air entrainment effect, since the "water jet pump effect" is better for sharp, fast, small cross-section air jets than for large cross-section, slow air curtains.
  • a dryer unit as specified in claim 13 can simply be exchanged for an infrared dryer unit provided in the same standard slide-in frame. With short changeover times, this makes it possible to work with one and the same printing press with either infrared drying or blown air drying.
  • FIG. 1 shows a dryer element, generally designated 10, which has an outer housing, generally designated 12.
  • the outer housing 12 is delimited by side walls 14, 16, a bottom wall 18 and a grid 20 which is placed on folded support sections 22 of the side walls 14, 16.
  • the walls 14-18 have a large dimension when viewed perpendicular to the plane of the drawing.
  • the side walls 14, 16 carry, via arms 30, 32, reflector walls 34, 36, which together define an inner housing, designated overall by 38. This runs at a distance from Outer housing 12 so that secondary air channels are obtained between the two housings.
  • a horizontal bottom section is formed on the reflector wall 36, and the lower ends of the reflector walls 34, 36 essentially end in an extension of the delivery channel 24.
  • Upper wall sections 40, 42 of the reflector walls 34, 36 are arc-shaped. Their free edges delimit a cooling air inlet opening 44 of the inner housing 38, which is at a distance behind the grille 20.
  • a heating / nozzle unit designated overall by 46. This includes a heating pipe 48 running perpendicular to the drawing plane of FIG. 1, a nozzle pipe 50 running parallel and at a distance below the heating pipe 48, and a 180 ° elbow 52 with the same cross section, which smoothes the ends of the heating pipe 48 and nozzle pipe 50 lying behind the drawing plane connects.
  • the front end of the heating tube 48 in FIG. 1 carries a connecting piece 54 which can be connected to the front of a blower, not shown, e.g. through a flexible hose.
  • the front end of the nozzle tube 50 in FIG. 1 is closed by an end wall 56.
  • openings 58 are provided in the peripheral wall of the nozzle tube 50 at intervals, in which nozzle bodies 60 are inserted. These each have a nozzle bore 62 which is aligned with the central plane of the discharge channel 24.
  • the nozzle body extends 60 at a distance through the slot 64 delimited by the free edges of the lower ends of the reflector walls 34, 36 up to the start of the discharge channel 24.
  • the nozzle body 60 is thus also at a distance from the left end of the bottom wall 18 and from the lower end of the side wall 14.
  • a twin infrared radiator 66 In the space lying between the legs of the U-shaped heating / nozzle unit, a twin infrared radiator 66, designated overall by 66, is arranged. This has a transparent housing 68 made of quartz glass, in which two heating coils 70, 72 are accommodated. The infrared radiator 76 extends over the entire length of the heating tube 48 and at a relatively short distance from the lowest point of the heating tube 48.
  • the half of the outer surface of the housing 68 which is remote from the heating tube 48 is provided with a reflective coating 74, which in practice can be an evaporated gold layer.
  • the ends of the infrared radiator 66 are held by angle brackets 76, which in turn are screwed to brackets 78 welded to the top of the nozzle tube 50, as shown at 80.
  • the dryer element described above works as follows: The air supplied to the nozzle 54 is pressed through the heating tube 48. The heat rays emitted by the infrared radiator 66 are absorbed by the outer surface of the heating tube 48, so that the heating tube 48 as a whole heats up to a high temperature. Heat is emitted from the heating tube 48 to the air pushed through, and the warm air reaches the nozzle tube 50 via the 180 ° elbow 52.
  • the heated air is discharged through the nozzle body 60 to the discharge channel 24.
  • the heated air is released in the form of sharp jets. Because of the sudden increase in the cross section of the jet at the discharge end of the nozzle body 60, a vacuum is obtained there.
  • air is drawn through the interior of the inner housing 38, as indicated by arrows 82.
  • air is drawn in via the secondary air channels, as indicated by the arrows 84.
  • the reflector walls 34, 36, on which a portion of the radiation emitted by the infrared emitter 66 also falls, are thus surrounded by secondary air on both sides and are thereby cooled.
  • the secondary air preheated in this way which is drawn in via the grille 20, is mixed in the discharge duct 24 with the very hot air which has flowed through the heating tube 48.
  • a large volume of warm blown air 86 is thus obtained, which emerges from the discharge channel 24 in the form of a curtain and meets, at an angle, a printed printed sheet 88 which moves in the direction of arrow 90.
  • the hot blown air curtain dries layers of paint and varnish on printed sheet 88.
  • the infrared radiator 66 can have an output of 3.5 kW and heat an air volume of 60 to 100 m3 of air to about 140 ° C. per hour. Mixing with about half the amount of secondary air then gives blowing air of about 100 ° C., as is desired for drying water-based paints.
  • the ratio between the radiation power absorbed by the heating tube 48 and the radiation power absorbed by the reflector walls 34, 36 can be specified via the surface properties of these elements: If the inner surface of the reflector walls 35, 36 is well reflective, the surface of the heating tube 48, on the other hand, absorbs radiation well, so the heat emitted by the infrared radiator 66 largely goes to the air flowing through the heating tube 48. If the reflectivity of the reflector walls 34, 36 deteriorates, an increasing proportion of the radiation power is emitted to the secondary air flow 82, 84 via the reflector walls 34, 36.
  • FIG. 2 shows, on an enlarged scale, the path of a few selected rays which originate from the heating coil 70.
  • a single cylindrical reflector 92 is provided which coaxially surrounds the heating tube 48.
  • rays which emanate from the heating coil 70 at an angle of approximately 45 ° to the vertical are reflected by the surface of the heating tube 48 (assuming incomplete absorption of the rays).
  • part of the power of the infrared radiator 66 is thus already due to the geometry onto the reflector walls 34, 36 transmitted.
  • this effect is weakened in that the reflector is cylindrical only above the center line of the heating tube 48 and, on the other hand, is flat below the center line. In this way it is achieved that the rays emitted by the heating coils, which are inclined at more than 45 ° to the vertical, reach the outer surface of the heating tube 48, as is also shown by the ray 100 shown there.
  • the reflector axis can be placed parallel to and at a distance from the heating tube axis, as shown in FIG. 3.
  • M1 denote the heating tube axis
  • M2 the reflector axis.
  • two crescent-shaped light funnels are obtained, which guide the jet 100 and also a jet 102, which passes straight across the outer surface of the heating tube 48, to the outer surface of the heating tube 48. It can be seen that the rays in between, which represent approximately the same heat output as the rays lying between the vertical and the ray 102, reach approximately the upper half of the heating tube 48 in total. In the arrangement shown in FIG. 3, heating tube 48 is thus heated quite uniformly in the circumferential direction.
  • FIG. 4 shows a blown air dryer unit, designated overall by 104, with a frame 106 composed of angle profiles, which carries several dryer elements 10.
  • An infrared dryer unit designated as a whole by 108, carries a plurality of infrared radiators 66 on an identical frame 106.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP89906100A 1988-10-14 1989-05-24 Trocknerelement Expired - Lifetime EP0438410B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89906100T ATE85002T1 (de) 1988-10-14 1989-05-24 Trocknerelement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3835000 1988-10-14
DE3835000A DE3835000A1 (de) 1988-10-14 1988-10-14 Trocknerelement

Publications (2)

Publication Number Publication Date
EP0438410A1 EP0438410A1 (de) 1991-07-31
EP0438410B1 true EP0438410B1 (de) 1993-01-27

Family

ID=6365106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89906100A Expired - Lifetime EP0438410B1 (de) 1988-10-14 1989-05-24 Trocknerelement

Country Status (5)

Country Link
US (1) US5159763A (ja)
EP (1) EP0438410B1 (ja)
JP (1) JPH04502887A (ja)
DE (2) DE3835000A1 (ja)
WO (1) WO1990003888A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011072895A1 (de) * 2009-12-17 2011-06-23 Koenig & Bauer Aktiengesellschaft Trockner

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228454C2 (de) * 1992-08-26 1999-01-14 Monforts Gmbh & Co A Vorrichtung zum Beblasen einer textilen Warenbahn
KR100272749B1 (ko) * 1992-08-26 2001-03-02 몬포르츠 폰 호베 클레멘스아우구스트 직물 피륙용 송풍장치
US5317127A (en) * 1992-08-28 1994-05-31 Pitney Bowes Inc. Apparatus including air blowing and infrared light means for drying ink on a sheet
DE4244003A1 (de) * 1992-12-24 1994-06-30 Platsch Hans G Strahlungstrocknerleiste und Strahlungstrockner mit solcher
US5517214A (en) * 1993-07-20 1996-05-14 A.B. Dick Company Ink jet image drier
US6293196B1 (en) * 1993-10-06 2001-09-25 Howard W. DeMoore High velocity, hot air dryer and extractor
DE10083341D2 (de) * 1999-11-11 2002-12-05 Smart Reflow Gmbh Konvektionsmodul mit pneumatischem Antrieb
DE10244288A1 (de) * 2002-09-23 2004-04-01 Eltosch Torsten Schmidt Gmbh Vorrichtung zur Führung von Luft
US20100071225A1 (en) * 2008-09-19 2010-03-25 Shannon Ross Portable cooler drying frame
EP2463100B1 (de) * 2010-12-03 2013-07-17 Heidelberger Druckmaschinen AG Bogen verarbeitende Maschine, insbesondere Bogendruckmaschine
JP5631908B2 (ja) * 2012-01-31 2014-11-26 富士フイルム株式会社 乾燥装置及び画像形成装置
US20130306271A1 (en) * 2012-05-18 2013-11-21 Shenzhen China Star Optoelectronics Technology Co., Ltd. Blowing Device and Method for Using the Blowing Device
US9387698B2 (en) 2014-07-24 2016-07-12 Xerox Corporation Printer convection dryer
US10308010B2 (en) * 2017-02-08 2019-06-04 Ricoh Company, Ltd. Infrared-heated air knives for dryers
CN108759406A (zh) * 2018-06-30 2018-11-06 浙江唐艺织物整理有限公司 一种植绒布高效烘干装置
DE102022124575A1 (de) 2022-09-23 2024-03-28 Duo Technik Gmbh Vorrichtung zum Trocknen von Flächengebilden
DE102022124767A1 (de) 2022-09-27 2023-09-07 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Trocknen von Bedruckstoff
EP4417425A1 (de) * 2023-02-16 2024-08-21 Heidelberger Druckmaschinen AG Trockner zum trocknen eines mit fluid beaufschlagten bedruckstoffs

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
DE1070647B (de) * 1959-12-10 Kalle S. Co. Aktiengesellschaft, Wiesbaden-Biebrich Infrarotfrockner für Druckmaschinen
DE631625C (de) * 1936-07-11 Albert Schnellpressen Vorrichtung zum Schraegaufblasen von Luft o. dgl. auf Papier- oder sonstige Bahnen und Bogen mittels Blasduesen
DE1074056B (de) * 1960-01-28 James Hallcy S. Sons Limited West Bromwich Stafford (Großbritan men) Rohrformige zum Einbau in eine Druck maschine bestimmte Warmluft Heizvor richtung
US2683939A (en) * 1952-05-12 1954-07-20 Master Appliance Mfg Co Electric drying and exhaust unit
GB895655A (en) * 1958-11-04 1962-05-02 Halley & Sons Ltd James Improved apparatus for drying printed webs of material
GB922296A (en) * 1961-02-16 1963-03-27 Strattwell Developments Ltd Improvements in apparatus for drying continuous webs of textile and other materials
ZA711340B (en) * 1970-03-19 1972-10-25 Wiggins Teape Res Dev Improvements in methods and apparatus for drying sheet material
US3894343A (en) * 1972-06-15 1975-07-15 Thermogenics Of New York Ink curing and drying apparatus
DE2731075A1 (de) * 1977-07-09 1979-01-25 Eugen Knobel Durchlaufofen fuer warenbahnen
SE8106875L (sv) * 1981-11-19 1983-05-20 Svecia Silkscreen Maskiner Ab Torkanleggning
FI75008C (fi) * 1986-03-14 1992-02-17 Valmet Oy Svaevtork och foerfarande foer effektivering av dess funktion.
US4727655A (en) * 1987-02-02 1988-03-01 Amjo Infra Red Dryers, Inc. Heat lamp assembly with air duct
US4981433A (en) * 1988-10-15 1991-01-01 Brother Kogyo Kabushiki Kaisha Sheet heating device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011072895A1 (de) * 2009-12-17 2011-06-23 Koenig & Bauer Aktiengesellschaft Trockner

Also Published As

Publication number Publication date
JPH04502887A (ja) 1992-05-28
US5159763A (en) 1992-11-03
WO1990003888A1 (de) 1990-04-19
DE3835000A1 (de) 1990-04-19
EP0438410A1 (de) 1991-07-31
DE58903419D1 (de) 1993-03-11

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