EP1058805B2 - Verfahren und vorrichtung zum trocknen eines schnell geförderten trocknungsgutes, insbesondere zum druckfarbentrocknen - Google Patents

Verfahren und vorrichtung zum trocknen eines schnell geförderten trocknungsgutes, insbesondere zum druckfarbentrocknen Download PDF

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Publication number
EP1058805B2
EP1058805B2 EP99910235A EP99910235A EP1058805B2 EP 1058805 B2 EP1058805 B2 EP 1058805B2 EP 99910235 A EP99910235 A EP 99910235A EP 99910235 A EP99910235 A EP 99910235A EP 1058805 B2 EP1058805 B2 EP 1058805B2
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EP
European Patent Office
Prior art keywords
dried
substance
temperature
drying
radiation
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Expired - Lifetime
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EP99910235A
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German (de)
English (en)
French (fr)
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EP1058805B1 (de
EP1058805A1 (de
Inventor
Rainer Gaus
Kai K. O. BÄR
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Advanced Photonics Technologies AG
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Advanced Photonics Technologies AG
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    • 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 for drying a drying material conveyed rapidly in a conveying direction and to such a device according to the preamble of patent claims 1 and 17, respectively.
  • the material to be dried is deflected along its conveying path over a plurality of deflection rollers. It can rest on a particular pulley either one or the other side of the material to be dried. If e.g. in an apparatus for printing paper, an ink layer applied to the paper and the printed paper is deflected with its printed side adjacent to a deflection roller, the ink layer must already be sufficiently dry before the paper reaches the pulley. But for other on the printing following steps is a sufficiently dry ink ⁇ condition. For this purpose, for example, the stacking of printed Einzelblättem one above the other or rolling up a printed paper called web. The same applies to through and through wet paper webs, which are promoted quickly for further processing in papermaking.
  • a Textit heat treatment device is known in which infrared rays having a wavelength of 1.5 to 3 microns are used.
  • the invention has the object of demonstrating method and device of the type mentioned in that a fast and safe drying is possible.
  • a moisture component in particular a solvent
  • the separated moisture component is separated by a Transport gas stream removed from the drying zone.
  • Electromagnetic radiation especially infrared radiation, has proven to be particularly convenient and efficient for drying. Even at high conveying speeds of the substrate, only one drying zone having a short length in the conveying direction is required.
  • the transport gas stream is formed from expanded compressed air.
  • the separated moisture component When separating the moisture component from the material to be dried, the separated moisture component can form a boundary layer covering the material to be dried, which hinders further drying. In particular, a dynamic equilibrium is established on the surface of the material to be dried, in which approximately the same amount of moisture particles emerge from the material to be dried as they again enter the material to be dried from the boundary layer. According to the invention, therefore, the separated moisture component is removed by a transport gas stream from the drying zone. In particular, with continuous supply of the transport gas in the drying zone, the formation of a drying-inhibiting boundary layer is prevented by the particles of the separated moisture component are transported away for a short time after emerging from the Trocknungsgut.
  • the electromagnetic radiation is tuned to the absorption properties of the moisture component, that the radiation energy is absorbed substantially only by the moisture component and not by the other components of the material to be dried and / or by a non-wet carrier material.
  • the moisture component is not vaporized in the true sense, but the particles of the moisture component are specifically stimulated or knocked out of the drying material.
  • the transport gas stream (D) flows in a direction transverse to the conveying direction range from a direction in the drying zone, which includes a surface normal of the material to be dried an angle of 60 to 90 °, preferably of about 80 °, and hits like a knife on the Trocknungsgut on.
  • the transport gas entrained from the drying material leaked moisture particles, without transmitting a significant portion of its kinetic energy to the drying material.
  • the transport gas stream unfolds in the region of its inflow into the drying zone, a proximity effect by impinging directly on the surface of the material to be dried, so that a Surface layer formed by the separated wet component is lifted like a knife from the material to be dried.
  • the flat angle of incidence enhances the knife-like effect.
  • the combination of the proximity effect with the extent of the region in which the transport gas stream flows into the drying zone, transversely to the conveying direction results in an advantageous rapid drying effect over the entire width of the region.
  • the speed of the transport gas flow over the entire width of the material to be dried is the same.
  • the transport gas flow formed from expanded compressed air flows either in the conveying direction of the carrier material or opposite to the conveying direction in a path on the surface of the material to be dried.
  • This distance may in particular be longer than the length of the drying zone in which electromagnetic radiation is incident.
  • the gas temperature of the transport gas stream at least before hitting the moisture component, lower than the temperature of the material to be dried. This is particularly advantageous in the case of heat-sensitive carrier material, since a heat transfer of the material to be dried from the carrier material can be reduced or prevented by the cooling of the material to be dried.
  • the incident electromagnetic radiation has a spectral intensity maximum, which is in the near infrared, in particular in the wavelength range of 0.8 to 2.0 microns.
  • a substantial proportion of the radiation energy is deliberately introduced as excitation energy for particles of the moisture component, in particular water, into the material to be dried.
  • said wavelength range are several absorption bands of water. But other moist components, in particular solvents, have absorption bands in this wavelength range.
  • the transport gas stream after leaving the drying zone flows to the radiation source of the electromagnetic radiation in order to cool it.
  • the radiation source of the electromagnetic radiation in order to cool it.
  • cooling is required.
  • the transport gas flow can be dispensed with either further, additional cooling, or such, additional cooling can be dimensioned correspondingly smaller.
  • the temperature of the dried material to be dried and / or the temperature of the separated moisture component and / or the temperature of the carrier material is controlled by adjusting the Strahlungsfluß réelle the incident in the drying zone electromagnetic radiation according to a development of the method.
  • the temperature to be controlled is measured by means of a pyrometer.
  • an electric incandescent lamp in particular a halogen lamp, is used as the radiation source for the electromagnetic radiation, and the incandescent current of the incandescent lamp is adjusted for setting the radiation flux density. Additionally or alternatively, the distance of the radiation source from the drying zone is adjusted to set the Strahlungsflußêt.
  • Drying is particularly efficient in a further development of the method in which the non-absorbed radiation components of the electromagnetic radiation passing 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. It increases the absorbed radiation fraction.
  • the radiation sources used to generate the electromagnetic radiation or the radiation source used can be made smaller in terms of their radiation power, or it can be irradiated a larger drying zone. It is also possible to irradiate by reflected radiation components zones on the conveying path of the carrier material to which no radiation is incident directly from the radiation sources or the radiation source.
  • a reflector used for the reflection of the unabsorbed radiation components is 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.
  • the paper is newsprint paper, which is conveyed at a conveying speed between 10 and 20 m / s, in particular at a little 15 m / s, or is the paper thermal printing paper having a conveying speed between 2 and 10 m / s , in particular at about 5 m / s is promoted.
  • the temperature of the carrier material is adjusted to a value below 70 ° C, in particular below 50 ° C and / or regulated. In this way, an undesired thermally induced change of the carrier material or its properties can be avoided.
  • the transport gas flows at a speed between 20 and 120 m / s on theShuntransport Schlden particles of the separated moisture component and ruptures these particles with.
  • the speed of impact is between 30 and 40 m / s.
  • the device according to the invention for drying a drying material conveyed quickly in a conveying direction in particular for drying ink layers on rapidly conveyed paper, has the features of claim 17.
  • the transport gas connection is a compressed air connection and the transport gas guide has a compressed air distributor extending transversely to the delivery path, in particular a distributor tube, for distributing compressed air flowing into the compressed air connection substantially over the entire width of the delivery path.
  • a single compressed air connection is sufficient to introduce compressed air, which serves over the entire width of the conveying path for removing the moisture component from the Trocknungsgut.
  • the transport gas guide preferably has a guide surface extending approximately along the conveying path of the material to be dried, whose distance from the conveying path decreases in the gas flow direction.
  • the guide surface ends at a gas passage gap defined by it and the material to be dried. Through the gap, the drying gas is fed into the drying zone.
  • the drying gas After passing through the gap, the drying gas, depending on the design of the end of the guide surface, form flow vortices or be guided approximately laminar in the drying zone.
  • Flow vortices in particular favored by a sharp-edged bent end of the guide surface, accelerate the removal of moisture particles immediately in the area behind the gap, but reduce the efficiency of the removal at a greater distance behind the gap.
  • the transport gas flow in the drying zone.
  • the gap width of the gas passage gap is between 2 and 15 mm, in particular between 5 and 10 mm.
  • the transport gas forms over the entire length of the drying zone in the conveying direction or opposite to the conveying direction a flowing separating layer between the material to be dried and already separated moist particles.
  • the particle density of the moisture particles first decreases and increases again at a greater distance from the Trocknungsgut, still in the transport gas flow or beyond the Transportgasstromes.
  • the knife-like action results in a higher net discharge rate of moisture particles from the drying stock, i. it prevents significant back-diffusion of the moisture particles into the material to be dried.
  • the radiation source is an incandescent lamp, in particular a halogen incandescent lamp.
  • Halogen bulbs can be purchased inexpensively in the trade. Their emission temperature is adjustable by adjusting the glow current to various applications.
  • lamp reflectors or reflectors are provided in the region of the lamp, so that the radiation emitted by the lamp fills as completely as possible in the drying zone. By shaping and arrangement of the lamp reflectors and the spatial distribution of the radiation flux can be adjusted via the drying zone.
  • a reflector is provided for reflecting unabsorbed radiation passing through the carrier material, which is arranged on the side of the conveying path opposite the radiation source.
  • a water cooling is provided on the reflector.
  • the apparatus preferably has a control circuit for regulating the temperature of the material to be dried and / or the temperature of the separated moisture component and / or the temperature of the carrier material.
  • the control circuit comprises a pyrometer for measuring the temperature to be controlled, a current actuator for adjusting the incandescent lamp current and a current regulator which actuates the actuator in dependence on the temperature reading of the pyrometer to adjust the glow current.
  • the device comprises a distance actuator for adjusting the distance of the radiation source from the conveying path of the carrier material and a distance controller which controls the actuator operated in response to the Temperaturmeßwert the pyrometer to adjust the distance of the radiation source.
  • Fig. 1 shows a carrier material consisting of paper 1 and on its surface a layer of wet ink 2 carries.
  • the paper 1 is transported to the right in the selected representation, as illustrated by an arrow in the direction of transport R.
  • the ink 2 is hit by infrared radiation 4, which is partially absorbed by the solvent water, which is contained in the printing ink 2 at a high percentage, for example 90%. It thus forms in the conveying direction in or behind the zone in which the infrared radiation 4 impinges, a thin boundary layer of water vapor 3, which consists of the ejected from the ink 2 particles.
  • the water vapor 3 impedes the further drying of the printing ink, as indicated schematically by the right-hand arrow pointing downwards.
  • At least two processes play a role: the dynamic equilibrium between water particles entering and leaving the printing ink 2 and the absorption of radiation in the water vapor layer.
  • FIG. 2 shows an apparatus 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 newsprint web.
  • the paper web 1 is conveyed at a speed of about 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 in one direction only.
  • the paper is conveyed in the selected in Fig. 2 representation from left to right.
  • the arrangement of the compressed air guide 14 would be the same in the event that the paper would be conveyed from right to left.
  • only a pyrometer 11 (function will be described below) in the conveying direction behind the compressed air guide 14, d. H. to the left of this.
  • a drying zone T In which radiation emitted by halogen line radiators 10 impinges on the printing ink 2, whose most energy-rich components are essentially infrared radiation 4.
  • a spectral filter can be arranged between the halo-line radiators 10 and the material to be dried.
  • a compressed air connection 12 of the compressed air guide 14 compressed air is supplied in a over the entire width of the conveying path of the paper web 1 Vietnameserekkendes manifold 15.
  • the manifold 15 is shown cut open at the front of the front to make his profile recognizable. In fact, however, the manifold 15 is laterally closed. From the manifold 15, the compressed air exits through an over the entire width of the conveying path extending outlet opening 16. On the way there, the compressed air is initially directed opposite to the conveying direction and then approximately at right angles kinking through a transverse guide portion in the direction of the paper web 1. In the transverse guide portion sets a guide surface 17, which also extends over the entire width of the conveying path.
  • the guide surface 17 and the paper web 1 define a narrowing in the compressed air flow direction gap in which the compressed air flows.
  • the guide surface 17 and coming from the guide roller 7, in a straight direction funded paper web 1 form an angle ⁇ of about 10 ° with each other.
  • the gap width of the over the entire width of the conveying path occidentalrekkenden passage gap 18 is about 7 mm.
  • the supplied through the compressed air guide 14 air flows at a rate of about 35 m / s through the passage gap 18 in the drying zone T.
  • Water vapor particles are transported away from the air flow D, which knocked out of the ink 2 by the infrared radiation 4 have been.
  • Flow paths of the airflow D are represented by numerous, slightly upwardly directed, curved arrows in FIG.
  • a pyrometer 11 At a position of the conveying path of the paper web 1, which lies in the conveying direction behind the drying zone T, a pyrometer 11 is directed.
  • the pyrometer 11 thus takes by radiation measurement, the temperature of the surface 11 carried by the paper web surface layer on, which consists essentially of already dried ink 2.
  • the temperature reading is fed to a controller (not shown).
  • the controller for example a Pl or PID controller, then outputs a control signal that can be received by two actuators.
  • a current actuator which serves the short-term, responsive adjustment of the glow current of the halogen halide emitters 10, is controlled by the controller, if a mostly minor, responsive adjustment of the Strahlungsflußêt is required.
  • a distance control element is actuated in order to change the distance of the radiation source 10 from the conveying path of the paper web 1.
  • This slow pitch control compared to current control, extends the overall control range by harnessing the relatively narrow current control range for a wide range of temperature or radiant flux density.
  • compressed air of low residual moisture is introduced into the compressed air port 12, which is cooled by the subsequent expansion in the manifold and / or after flowing out of the manifold 15 5. Dry, cold air is thus conducted into the drying zone T.
  • This has the advantage that on the one hand the removal of the moisture component from the drying zone T is improved and on the other hand, the temperature of the ink 2 and thus 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, wherein the paper web 1 is conveyed at a conveying speed of about 5 m / s and the air velocity at the passage gap 18 is about 35 m / s.
  • the drying device according to the invention can also be used, in particular, in devices for producing sheet-like printed products, for example brochures, magazine or drawing sheets, which convey the starting material to be printed by means of a vacuum conveying device.
  • the method according to the invention and the device according to the invention can be advantageously used in printing devices which produce individualized printed products, for example, tickets with consecutive numbers or successive sheets or paper web sections with individual bar codes.
  • Such systems often have inkjet printers, especially with a print resolution of 240 dpi or better.
  • the device i or the method according to the invention for example, printing outputs of 54,000 A4 sheets per hour are possible.

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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)
EP99910235A 1998-02-23 1999-02-18 Verfahren und vorrichtung zum trocknen eines schnell geförderten trocknungsgutes, insbesondere zum druckfarbentrocknen Expired - Lifetime EP1058805B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19807643 1998-02-23
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
PCT/EP1999/001057 WO1999042774A1 (de) 1998-02-23 1999-02-18 Verfahren und vorrichtung zum trocknen eines schnell geförderten trocknungsgutes, insbesondere zum druckfarbentrocknen

Publications (3)

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

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EP99910235A Expired - Lifetime EP1058805B2 (de) 1998-02-23 1999-02-18 Verfahren und vorrichtung zum trocknen eines schnell geförderten trocknungsgutes, insbesondere zum druckfarbentrocknen

Country Status (14)

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

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DE59905454D1 (de) 2003-06-12
WO1999042774A1 (de) 1999-08-26
KR20010041240A (ko) 2001-05-15
DE19807643A1 (de) 1999-09-02
CN1292080A (zh) 2001-04-18
ES2199562T5 (es) 2007-04-16
DE19807643C2 (de) 2000-01-05
ES2199562T3 (es) 2004-02-16
HUP0101524A3 (en) 2002-02-28
KR100407504B1 (ko) 2003-12-01
CZ20003007A3 (cs) 2001-12-12
HUP0101524A2 (hu) 2001-10-28
BR9908062A (pt) 2000-10-31
JP2002504442A (ja) 2002-02-12
AU2926899A (en) 1999-09-06
JP4509378B2 (ja) 2010-07-21
ATE239891T1 (de) 2003-05-15
EP1058805B1 (de) 2003-05-07
CA2330636A1 (en) 1999-08-26
US6401358B1 (en) 2002-06-11
EP1058805A1 (de) 2000-12-13

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