EP1058805A1 - Procede et dispositif pour le sechage d'un produit defilant rapidement, notamment pour le sechage d'encre d'imprimerie - Google Patents

Procede et dispositif pour le sechage d'un produit defilant rapidement, notamment pour le sechage d'encre d'imprimerie

Info

Publication number
EP1058805A1
EP1058805A1 EP99910235A EP99910235A EP1058805A1 EP 1058805 A1 EP1058805 A1 EP 1058805A1 EP 99910235 A EP99910235 A EP 99910235A EP 99910235 A EP99910235 A EP 99910235A EP 1058805 A1 EP1058805 A1 EP 1058805A1
Authority
EP
European Patent Office
Prior art keywords
dried
drying
temperature
radiation
transport gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99910235A
Other languages
German (de)
English (en)
Other versions
EP1058805B2 (fr
EP1058805B1 (fr
Inventor
Rainer Gaus
Kai K. O. BÄR
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.)
Advanced Photonics Technologies AG
Original Assignee
Advanced Photonics Technologies 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
Family has litigation
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Application filed by Advanced Photonics Technologies AG filed Critical Advanced Photonics Technologies AG
Publication of EP1058805A1 publication Critical patent/EP1058805A1/fr
Application granted granted Critical
Publication of EP1058805B1 publication Critical patent/EP1058805B1/fr
Publication of EP1058805B2 publication Critical patent/EP1058805B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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 method and a device for drying a material to be conveyed quickly in a conveying direction, in particular for drying layers of printing ink on rapidly conveyed paper.
  • the invention particularly relates to rapidly conveyed paper with a conveying speed between 2 and 25 m / s.
  • a fast-acting drying is essential.
  • the material to be dried is deflected along its conveying path via several deflection rollers. Either one or the other side of the material to be dried can rest against a certain deflection roller.
  • an ink layer is applied to the paper and the printed paper is deflected with its printed side against a deflection roller, the ink layer must already be sufficiently dry before the paper reaches the deflection roller.
  • a sufficiently dry printing ink is also a prerequisite for other work steps following the printing.
  • the stacking of printed single sheets on top of one another or the rolling up of a printed paper web may be mentioned. The same applies to thoroughly moist paper webs that are quickly conveyed for further processing in paper production.
  • the invention has for its object to provide a method and an apparatus of the type mentioned with which the material to be dried can be dried quickly.
  • a damping component in particular a solvent
  • the separated moist component becomes transported away from the drying zone by a transport gas stream.
  • Electromagnetic radiation especially infrared radiation, has proven to be particularly useful and efficient for drying. Even at high conveying speeds of the carrier material, only one drying zone is required, which has a short length in the conveying direction.
  • the separated moisture component can form a boundary layer covering the material to be dried, which hinders further drying.
  • there is a dynamic equilibrium on the surface of the material to be dried in which approximately the same number of moist particles emerge from the material to be dried as enter the material to be dried again from the boundary layer.
  • the separated moist component is therefore removed from the drying zone by a transport gas stream. transported.
  • the transport gas is fed continuously into the drying zone, the formation of a barrier-preventing barrier layer is prevented by the particles of the separated moist component being removed a short time after exiting the material to be dried.
  • the electromagnetic radiation is preferably matched to the absorption properties of the wet component in such a way that the radiation energy is essentially absorbed only by the wet component and not by the other components of the material to be dried and / or by a non-moist carrier material.
  • the wet component is not actually evaporated, but the particles of the wet component are selectively excited or knocked out of the material to be dried.
  • the transport gas stream (D) flows in a region running transversely to the conveying direction from a direction into the drying zone which includes an angle of 60 to 90 °, preferably of approximately 80 °, with a surface normal of the material to be dried and strikes the material to be dried in a knife-like manner on.
  • the transport gas can carry away moisture particles that have escaped from the material to be dried without transferring a significant proportion of its kinetic energy to the material to be dried. Mechanical deformation of the material to be dried, which could lead to the smearing of sharp edges of printing ink applications, is thus avoided.
  • the transport gas stream preferably has a close effect in the region of its inflow into the drying zone by directly hitting the surface of the material to be dried, so that a separated wet component formed surface layer is lifted like a knife from the material to be dried.
  • the flat impact angle enhances the knife-like effect.
  • the combination of the local effect with the extension of the area in which the transport gas stream flows into the drying zone, transversely to the conveying direction, results in an advantageous fast drying effect over the entire width of the area.
  • the speed of the transport gas stream is expediently the same across the entire width of the material to be dried.
  • the transport gas stream flows along the surface of the material to be dried either in the conveying direction of the carrier material or in the opposite direction to the conveying direction.
  • This distance can in particular be longer than the length of the drying zone in which electromagnetic radiation is incident. This ensures that moisture particles are removed across the entire drying zone and even beyond it.
  • the gas temperature of the transport gas stream is lower than the temperature of the items to be dried, at least before it hits the wet component. This is particularly advantageous in the case of heat-sensitive carrier material, since cooling of the material to be dried can reduce or prevent heat transfer from the material to be dried from the carrier material.
  • the transport gas stream is expediently formed from expanded compressed air.
  • Radiation is a spectral intensity maximum that is in the near infrared, in particular in the wavelength range from 0.8 to 2.0 ⁇ m. As a result, a substantial proportion of the radiation energy is targeted as excitation energy for particles of the moist component, in particular water, into the
  • the transport gas stream flows after leaving the drying zone to the radiation source of the electromagnetic radiation in order to cool it. Cooling is particularly necessary when using temperature radiators that are operated at a temperature above 2500 K.
  • the transport gas stream can either dispense with additional cooling or such additional cooling can be made correspondingly smaller.
  • the temperature of the dried material to be dried and / or the temperature of the separated moist component and / or the temperature of the carrier material is adjusted by adjusting the radiation flux density of the electromagnetic radiation incident in the drying zone in accordance with a ner further training of the procedure regulated.
  • the temperature to be controlled is preferably measured using a pyrometer.
  • An electric incandescent lamp in particular a halogen lamp, is expediently used as the radiation source for the electromagnetic radiation, and the incandescent current of the incandescent lamp is set to adjust the radiation flux density. Additionally or alternatively, the distance of the radiation source from the drying zone is set to adjust the radiation flux density.
  • Drying is particularly efficient in a further development of the method, in which non-absorbed radiation components of the electromagnetic radiation that pass through the material to be dried are reflected back onto the material to be dried. There, the back-reflected radiation components are at least partially absorbed. The amount of radiation absorbed increases.
  • the radiation sources used to generate the electromagnetic radiation or the radiation source used can thus be dimensioned smaller in terms of their radiation power, or a larger drying zone can be irradiated. It is also possible, by means of reflected radiation components, to irradiate zones on the conveying path of the carrier material, on which no radiation is incident directly from the radiation sources or the radiation source.
  • a reflector used for the reflection of the non-absorbed radiation components is preferably cooled, in particular in order to minimize the emission of longer-wave infrared radiation.
  • the carrier material is paper which is conveyed at a conveying speed between 2 and 25 m / s. is promoted.
  • the paper is newsprint, which is conveyed at a conveying speed between 10 and 20 m / s, in particular at about 15 m / s, or is the paper thermal printing paper, which is conveyed at a conveying speed between 2 and 10 m / s , in particular is promoted at about 5 m / s.
  • the temperature of the carrier material is set and / or regulated to a value below 70 ° C., in particular below 50 ° C. In this way, an undesired thermally induced change in the carrier material or its properties can be avoided.
  • the transport gas stream preferably strikes the particles of the separated wet component to be transported at a speed between 20 and 120 m / s and entrains these particles.
  • the speed of impact is between 30 and 40 m / s. Due to a sufficiently high transport gas velocity, which lies, for example, in the above-mentioned areas, a drying-inhibiting layer of moisture particles separated from the material to be dried is reliably dissolved and / or lifted off the surface of the material to be dried, or is formed, at least directly on the surface
  • the device according to the invention for drying a material to be conveyed quickly in a conveying direction in particular for drying layers of printing ink on rapidly conveyed paper, has the following: 8th
  • a radiation source for generating electromagnetic radiation the radiation source being arranged such that at least some of the electromagnetic radiation hits the material to be dried in a drying zone on the conveying path of the carrier material in order to separate a moisture component, in particular a solvent, from the material to be dried, a transport gas connection for introduction of transport gas and - a transport gas guide (14) extending at least in parts transversely to the conveying direction, which is designed and arranged in such a way that transport gas introduced through the transport gas connection (12) is guided into the drying zone (T) and impinges on the material to be dried in the manner of a knife in order to remove the separated moist component (3) from the material to be dried (2).
  • the transport gas connection is a compressed air connection and the transport gas guide has a compressed air distributor which extends transversely to the conveying path, in particular a distributor pipe, for distributing compressed air flowing into the compressed air connection essentially over the entire width of the conveying path.
  • a single compressed air connection is therefore preferably sufficient to introduce compressed air which is used over the entire width of the conveying path for the removal of the moist component from the material to be dried.
  • the transport gas guide preferably has a guide surface which runs approximately along the conveying path of the material to be dried and whose distance from the conveying path is in Gas flow direction reduced.
  • the guide surface ends at a gas passage gap defined by it and the material to be dried. The drying gas is led through the gap into the drying zone.
  • the drying gas can, depending on the design of the end of the guide surface, form flow vortices or be guided into the drying zone in an almost laminar manner.
  • Flow vortices particularly favored by a sharp-edged end of the guide surface, accelerate the removal of moisture particles directly in the area behind the gap, but reduce the efficiency of removal at a greater distance behind the gap.
  • the transport gas flow in the drying zone can be optimally adjusted in this way by shaping the end of the guide surface.
  • the gap width of the gas passage gap is between 2 and 15 mm, in particular between 5 and 10 mm.
  • the knife-like effect arises in particular with such a narrow gas passage gap.
  • the separated moisture particles are thus removed from the surface of the material to be dried.
  • the transport gas forms a flowing separating layer between the material to be dried and already separated moisture particles over the entire length of the drying zone in the conveying direction or opposite to the conveying direction.
  • the particle density of the moist particles initially decreases from the surface of the material to be dried, at least in the vicinity of the gas passage gap, and decreases at a greater distance.
  • the knife-like effect leads to a higher net leakage rate of moist particles from the material to be dried, i.e. it prevents any appreciable back diffusion of the wet particles into the material to be dried.
  • the radiation source is an incandescent lamp, in particular a halogen incandescent lamp.
  • Halogen light bulbs can be purchased inexpensively in the trade. Your emission temperature can be adapted to different applications by adjusting the glow current.
  • Lamp reflectors or reflectors are advantageously provided in the area of the lamp, so that the radiation emitted by the lamp is incident as completely as possible in the drying zone.
  • the shape and arrangement of the lamp reflectors can also be used to set the spatial distribution of the radiation flow over the drying zone.
  • a reflector for reflecting non-absorbed radiation passing through the carrier material is preferably provided, which is arranged on the side of the conveying path opposite the radiation source.
  • water cooling is provided on the reflector.
  • the device In order to be able to control the temperature conditions in the drying zone and in the conveying direction behind the drying zone, the device preferably has a control circuit for regulating the temperature of the material to be dried 11
  • the control circuit comprises a pyrometer for measuring the temperature to be controlled, a current control element for setting the glow current of the incandescent lamp and a current regulator, which
  • Actuator depending on the temperature reading of the pyrometer actuated to set the glow current.
  • the device has a distance actuator for adjusting the distance of the radiation source from the conveying path of the carrier material and a distance controller which actuates the actuator depending on the temperature measurement value of the pyrometer by the distance of the radiation source adjust.
  • FIG. 1 shows a cross section through a carrier material which carries a material to be dried on its surface
  • Fig. 2 shows an embodiment of the invention
  • FIG. 1 shows a carrier material which consists of paper 1 and carries a layer of moist printing ink 2 on its surface.
  • the paper 1 is transported to the right in the selected representation, as illustrated by an arrow in the transport direction R.
  • Infrared radiation 4 strikes the printing ink 2, which is partially absorbed by the solvent water, which at high levels 12
  • Percentage for example 90%, is contained in printing ink 2.
  • the steam 3 hinders the further drying of the printing ink, as indicated schematically by the right, downward-pointing arrow.
  • FIG. 2 shows a device 8 according to the invention for drying moist, water-containing printing ink 2 on the surface of a rapidly conveyed paper web 1, in particular a printed newspaper web.
  • the paper web 1 is conveyed at a speed of approximately 15 m / s.
  • the paper can be conveyed either from right to left or from left to right, but during a certain drying process the paper web is conveyed only in one direction.
  • the arrangement of the compressed air guide 14 would, however, be the same in the event that the paper were conveyed from right to left.
  • only a pyrometer 11 would be in the conveying direction behind the compressed air duct 14, i. H. to the left of this.
  • the printing ink 2 the high-energy components of which are essentially infrared radiation 4, in particular a spectral filter (not shown) can be arranged between the halogen line emitters 10 and the material to be dried.
  • Part of the infrared radiation 4 is not absorbed in accordance with the degree of absorption of the wet component in the printing ink 2 and in accordance with the degree of absorption of the paper web 1, but passes through the paper web 1 and strikes an infrared reflector 20 which is arranged below the paper web 1. As indicated by an arrow, the infrared reflector 20 reflects infrared radiation impinging on it, so that this reflected radiation 5 is reflected back onto the paper web 1. Part of the reflected radiation 5 reaches the drying material 2 and is absorbed there, mainly by the water components of the printing ink 2.
  • a compressed air connection 12 of the compressed air guide 14 compressed air is fed into a distributor pipe 15 which extends over the entire width of the conveying path of the paper web 1.
  • the distributor pipe 15 is shown cut open on the front face in order to make its profile recognizable. In fact, the distributor pipe 15 is closed laterally.
  • the compressed air emerges from the distributor pipe 15 through an outlet opening 16 which extends over the entire width of the conveying path.
  • the compressed air is first directed in the opposite direction to the conveying direction and then bent at a right angle through a transverse guide section in the direction of the paper web 1.
  • a guide surface 17 which also extends over the entire width of the conveying path. The air flows through one along the guide surface 17 14
  • Passage gap 18 into the drying zone T Passage gap 18 into the drying zone T.
  • the guide surface 17 and the paper web 1 define an intermediate space tapering in the compressed air flow direction, in which the compressed air flows.
  • the guide surface 17 and the paper web 1 coming from the deflection roller 7 and conveyed in a straight direction form an angle ⁇ of approximately 10 ° with one another.
  • the gap width of the passage gap 18, which extends over the entire width of the conveying path, is approximately 7 mm.
  • the air supplied through the compressed air duct 14 flows at a speed of approximately 35 m / s through the passage gap 18 into the drying zone T. Water vapor particles are distributed over the entire drying zone T and are carried away by the air stream D and are knocked out of the printing ink 2 by the infrared radiation 4 have been. Flow paths of the air flow D are shown by numerous, slightly upward, curved arrows in FIG. 2.
  • a pyrometer 11 is directed to a point on the conveying path of the paper web 1, which lies behind the drying zone T in the conveying direction.
  • the pyrometer 11 thus measures the temperature of the surface layer carried by the paper web 11 by radiation measurement, which essentially consists of already dried printing ink 2.
  • the measured temperature value is fed to a controller (not shown).
  • the controller for example a PI or a PID controller, then outputs a control signal that can be received by two actuators.
  • a current actuator which is used for the short-term, responsive adjustment of the glow current of the halogen line emitters 10, is controlled by the controller when a mostly slight, responsive adjustment of the radiation flux density is required. If the temperature measurement value of the pyrometer 11 is on the edge of a predetermined 15
  • a distance actuator is driven in order to change the distance of the radiation source 10 from the conveying path of the paper web 1.
  • This distance control which is slow compared to current control, extends the overall control range by making the relatively narrow current control range usable for a large temperature or radiation flux density range.
  • the short-term change in the radiation flux density of the radiation power incident in the drying zone and thus a control of the temperature with low inertia is possible in the entire control range of the distance control.
  • Compressed air with low residual moisture is preferably introduced into the compressed air connection 12 and is cooled by the subsequent expansion in the distributor pipe and / or after it has flowed out of the distributor pipe 15. Dry, cold air is thus conducted into the drying zone T.
  • This has the advantage that on the one hand the removal of the moist component from the drying zone T is improved and on the other hand the temperature of the printing ink 2 and thus also the temperature of the paper web 1 can be kept low. In particular, it is possible to keep the temperature of the paper web 1 below 50 ° C., the paper web 1 being conveyed at a conveying speed of approximately 5 m / s and the air speed at the passage gap 18 being approximately 35 m / s.
  • the drying device according to the invention can in particular also be used in devices for producing sheet-like printed products, for example prospectus, magazine or drawing sheets, which convey the starting material to be printed on by means of a vacuum transport device. Furthermore, the method according to the invention and the device according to the invention can advantageously be used in printing devices, 16

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

Abstract

L'invention concerne un procédé et un dispositif pour le séchage d'un produit (1, 2) défilant rapidement dans un sens de transport, notamment pour le séchage de couches d'encre d'imprimerie sur du papier défilant rapidement. Dans une zone de séchage (T), un constituant humide, notamment un solvant du produit à sécher (1, 2), est séparé sous l'action d'un rayonnement électromagnétique incident et le constituant humide séparé est évacué de la zone de séchage (T) par un flux gazeux de transport (D). L'invention permet le séchage efficace et rapide, en particulier de papier journal imprimé ou bien de papier de thermo-impression, à des vitesses de défilement élevées.
EP99910235A 1998-02-23 1999-02-18 Procede et dispositif pour le sechage d'un produit defilant rapidement, notamment pour le sechage d'encre d'imprimerie Expired - Lifetime EP1058805B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19807643A DE19807643C2 (de) 1998-02-23 1998-02-23 Verfahren und Vorrichtung zum Trocknen eines Trocknungsgutes an der Oberfläche eines schnell geförderten Trägermaterials, insbesondere zum Druckfarbentrocknen
DE19807643 1998-02-23
PCT/EP1999/001057 WO1999042774A1 (fr) 1998-02-23 1999-02-18 Procede et dispositif pour le sechage d'un produit defilant rapidement, notamment pour le sechage d'encre d'imprimerie

Publications (3)

Publication Number Publication Date
EP1058805A1 true EP1058805A1 (fr) 2000-12-13
EP1058805B1 EP1058805B1 (fr) 2003-05-07
EP1058805B2 EP1058805B2 (fr) 2006-08-16

Family

ID=7858696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99910235A Expired - Lifetime EP1058805B2 (fr) 1998-02-23 1999-02-18 Procede et dispositif pour le sechage d'un produit defilant rapidement, notamment pour le sechage d'encre d'imprimerie

Country Status (14)

Country Link
US (1) US6401358B1 (fr)
EP (1) EP1058805B2 (fr)
JP (1) JP4509378B2 (fr)
KR (1) KR100407504B1 (fr)
CN (1) CN1292080A (fr)
AT (1) ATE239891T1 (fr)
AU (1) AU2926899A (fr)
BR (1) BR9908062A (fr)
CA (1) CA2330636A1 (fr)
CZ (1) CZ20003007A3 (fr)
DE (2) DE19807643C2 (fr)
ES (1) ES2199562T5 (fr)
HU (1) HUP0101524A3 (fr)
WO (1) WO1999042774A1 (fr)

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JP6784077B2 (ja) * 2016-06-29 2020-11-11 富士ゼロックス株式会社 液滴吐出装置
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JP7056209B2 (ja) * 2017-09-26 2022-04-19 富士フイルムビジネスイノベーション株式会社 吐出装置
CN112393569B (zh) * 2020-11-09 2022-09-27 桐乡市法赛欧服饰有限公司 一种纺织布料洗涤用初步脱水装置
KR102299715B1 (ko) * 2020-11-25 2021-09-09 주식회사 토바 롤투롤 인쇄 전극을 건조하는 방법

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DE19807643C2 (de) 2000-01-05
HUP0101524A2 (hu) 2001-10-28
EP1058805B2 (fr) 2006-08-16
KR20010041240A (ko) 2001-05-15
CA2330636A1 (fr) 1999-08-26
WO1999042774A1 (fr) 1999-08-26
JP2002504442A (ja) 2002-02-12
KR100407504B1 (ko) 2003-12-01
HUP0101524A3 (en) 2002-02-28
BR9908062A (pt) 2000-10-31
CN1292080A (zh) 2001-04-18
AU2926899A (en) 1999-09-06
ES2199562T5 (es) 2007-04-16
US6401358B1 (en) 2002-06-11
ATE239891T1 (de) 2003-05-15
CZ20003007A3 (cs) 2001-12-12
EP1058805B1 (fr) 2003-05-07
JP4509378B2 (ja) 2010-07-21
DE19807643A1 (de) 1999-09-02
ES2199562T3 (es) 2004-02-16
DE59905454D1 (de) 2003-06-12

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