EP0916915A1 - Combined convective-radiative system for heat treatment of a web - Google Patents

Combined convective-radiative system for heat treatment of a web Download PDF

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Publication number
EP0916915A1
EP0916915A1 EP19980402768 EP98402768A EP0916915A1 EP 0916915 A1 EP0916915 A1 EP 0916915A1 EP 19980402768 EP19980402768 EP 19980402768 EP 98402768 A EP98402768 A EP 98402768A EP 0916915 A1 EP0916915 A1 EP 0916915A1
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EP
European Patent Office
Prior art keywords
elements
strip
blowing
characterized
installation
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
EP19980402768
Other languages
German (de)
French (fr)
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EP0916915B1 (en
Inventor
Yannick Lescanne
Jean-Pierre Robin
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.)
SOLARONICS PROCESS
Original Assignee
Solaronics
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Filing date
Publication date
Priority to FR9714321A priority Critical patent/FR2771161B1/en
Priority to FR9714321 priority
Application filed by Solaronics filed Critical Solaronics
Publication of EP0916915A1 publication Critical patent/EP0916915A1/en
Application granted granted Critical
Publication of EP0916915B1 publication Critical patent/EP0916915B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/28Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101Supporting materials without tension, e.g. on or between foraminous belts
    • F26B13/104Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles

Abstract

Installation for the heat treatment of a strip (1), moving continuously opposite infrared radiant elements (3) and air blowing elements (2) on this strip (1). This installation comprises a succession of blowing elements (2) separated from each other by at least one infrared radiant element (3), each blowing element (2) comprising on each side a suction element (4) s' extending near an infrared radiant element (3). <IMAGE>

Description

The present invention relates to a system convecto-radiative for heat treatment of a strip keep on going.

We know that continuous bands or deposits performed on these continuous belts must undergo heat treatments. Often these treatments must be done without contact in order to preserve the quality of the surface condition of the strip or of the deposit made on it. This is for example so for the treated paper strips wet such as treatment to achieve coated paper.

To heat-treat these continuous strips without contact, two different techniques are currently used:

  • either continuous strip heating by means of infrared radiant elements,
  • or heating by means of blowing hot air.

The infrared radiant elements present a power density (power per unit of surface) very high, which makes it possible to obtain a heat treatment, by means of an installation relatively small footprint.

However, the use of these elements radiant heat requires the use of means to support the continuous strip, these support means in no way case come into contact with the paper strip.

Hot air heating systems have the disadvantage of having a power density much weaker than those using elements infrared radiant, their size is therefore very important compared to that of a radiant system infrared performing the same heat treatment.

However, this type of installation does not require no auxiliary means to support the strip; this function being ensured by the air which can also create ripples on the tape to increase its rigidity in the direction perpendicular to its travel.

An example of such an installation was described in international application WO 95/14199.

In order to combine the advantages of both techniques described above, attempts have been performed to combine them.

One of these attempts has been described in European patent 0 291 832 or US 5, 261,166. However, the solution described in the above patent is not perfect at least for the reasons mentioned below:

  • the blowing devices are not perfectly protected from the radiation coming from the infrared emitters,
  • the supply air can disturb the proper functioning of the infrared emitter.

The object of the present invention is to remedy to the disadvantages of the above techniques, by creating a continuous strip drying installation which presents a reduced bulk, which delivers a strong heating power density and which provides solution to support the continuous web.

The invention thus relates to an installation of heat treatment of a continuously moving belt next to infrared radiant elements and elements air blowers on this tape.

According to the invention, this installation is characterized in that it comprises a succession blowers separated from each other by at minus one infrared radiant element, each element blowing comprising on each side an element suction extending near a radiant element infrared.

The installation according to the invention thus combines infrared radiant elements with elements blowers and aspirants.

The size of the installation is thus greatly reduced due to:

  • infrared radiant elements which deliver a high power density,
  • supply air volumes which are at least 30% lower than those circulating in an installation using only hot air.

The blowing elements allow to support contactless tape, without the use of means auxiliary, while creating undulations on the strip ensuring its mechanical rigidity in the direction perpendicular to the scroll.

The suction elements arranged between the rows of infrared radiant elements, on each side of a blowing element, allow:

  • to suck in the air loaded with water vapor coming from the strip when it is desired to dry it, the air blown by the blowing elements as well as the combustion gases coming from the infrared radiant elements when these run on gas,
  • to effectively protect the blowing elements from the radiation coming from the infrared radiant elements, indeed the dimensional stability of the blowing systems is necessary for their proper functioning.

The configuration of the blower-suction modules is such that they do not disturb the operation of infrared radiant elements.

According to a preferred version of the invention, the blowers are separated from each other by two parallel rows of infrared radiant elements.

Preferably, each blowing element comprises near the strip at least one air blowing slot, transverse to the direction of travel Of the band.

Other features and advantages of the invention will appear further in the description below.

In the appended drawings given by way of nonlimiting examples:

  • FIG. 1 is a schematic view in partial longitudinal section of a thermal treatment installation according to the invention,
  • FIG. 2 is a view on an enlarged scale of the lower part of a blowing element and of the two adjacent suction elements,
  • FIG. 3 is a view similar to FIG. 1 concerning an alternative embodiment of the thermal treatment installation,
  • Figures 4 and 5 are views similar to Figures 1 and 3 concerning two other variants.

The preferred version of the invention as that illustrated in figure 1 concerns an installation for the heat treatment of a strip 1 which can be move at a speed that can reach or exceed 2000 m / min.

According to the invention, the installation of heat treatment includes a succession of elements blowers 2 separated from each other by at least one infrared radiant element 3. Each blowing element 2 includes a suction element on each side 4 extending near an infrared radiant element 3.

The radiant surface of the radiant elements 3 extends parallel to strip 1.

The blowing elements 2 and the elements aspirants 4 are made up of boxes substantially parallelepipedal extending vertically and across the width of the strip.

The blowing elements 2 are connected to means (not shown) for creating an overpressure of air.

The suction elements 4 are connected to means (not shown) for creating a depression.

In the example shown, the elements blowers 2 are separated from each other by two parallel rows of infrared radiant elements 3.

Each blower element 2 includes near the strip at least one and preferably two slots air supply 8, (see Figure 2), transverse by relative to the direction of movement D of the strip 1.

As seen in more detail in Figure 2, each suction element includes near the band 1 a suction mouth 9, forming an acute dihedral with the adjacent end wall 10 of the blowing element 2. The distance between the bottom of the dihedral and the band 1 is between 5 and 50 mm, in the preferred version this distance is between 10 and 25 mm.

In addition, the edge 11 of the suction mouth 9 closest to strip 1 is connected to the wall side 12 of the suction element 4 by a wall broken 13.

The arrangement of the suction mouth 9 allows both:

  • to obtain efficient suction: air charged with water vapor in the case of a drying operation, air blown by the modules 2, combustion gases in the case where the infrared elements operate on gas or air cooling electrical connections in the case where the radiant elements are electric infrared emitters,
  • avoid any disturbance of the operation of the infrared radiant elements 3,
  • to protect the blowing modules 2 from the radiation emitted by the radiant elements 3,
  • maintain the efficiency of the blowing modules by not disturbing the air pressure cushion created by them on the strip 1.

In the example of Figures 1 and 3, elements infrared radiant 3 and blowing elements 2 and applicants 4 are located on each side of the strip 1.

In the case of the installation shown on the Figure 3, elements 3, 2 and 4 are arranged symmetrically on either side of strip 1.

In the preferred version of Figure 1, the elements 3, 2 and 4 located on one side of the strip 1 are offset, in the direction of movement D of the strip 1, relative to elements 3, 2, 4 located on the other side of band 1. This offset is such that the elements 3 infrared radiant heaters located on one side are arranged opposite the blowing elements 2 and aspirants 4 located on the other side.

This staggered arrangement has the effect of create undulations on strip 1 which stiffen it mechanically in the direction perpendicular to the scroll.

In the example in Figure 4, on one of sides of strip 1, are arranged a succession radiant elements 3 and blowing elements 2 and aspirants 4, while on the other side are arranged only blower 2 and suction elements 4. In in the case of this configuration, the suction elements 4 may not exist.

The distribution of infrared radiant elements 3 and / or blowing 2 and suction elements 4 may vary along the direction D of movement of band 1.

This distribution takes into account the fact that the tape may require non power densities constant along its course.

The thermal treatment installation that just described works in the following way:

The strip 1 to be treated scrolls continuously in the direction D between the two superimposed series of elements 3, 4, 2.

Air blown by the blowers 2 (see arrows F in figure 2) hold the strip 1 away from successive elements 3, 4, 2 and supports thus the strip during its journey through the installation, without auxiliary support devices.

The infrared radiant elements 3 presenting high power density, transfer energy to band 1.

The suction elements 4 arranged on either side of each blowing element 2 suck through their suction mouth 9, the combustion gases emitted by the radiant elements 3, if they operate on gas, the water vapor emitted by the strip 1 if it is dried (see arrows F 1 in FIG. 2) and the air coming from the blowing elements 2 (see arrows F 2 ).

In another embodiment, when the radiant elements only exist on one side, side opposite to the radiant elements 3 of the reflectors can be arranged to improve efficiency thermal system.

In this case these reflectors are arranged alternately with blowing elements, so to support the paper.

In addition, these reflectors can also serve as suction elements.

Finally in another provision, these reflectors can be-placed between elements blowers and aspirants.

In all cases, the arrangement of the elements radiant, blowers and aspirants can be such that it provides a non-straight path from the bandaged.

The main advantages of the installation just described are as follows:

  • the installation has a high power per unit area, thanks to the radiant elements 3, and to the blower 2 and suction elements 4 which, because of their compact shape and their reduced size, do not greatly affect the total size of the 'installation.
  • the blowing elements 2 make it possible to support the strip 1, without rollers or other auxiliary means, over all or part of the path of the strip in the installation.
  • the provision of suction elements 4 on each side of a blowing element 2 makes it possible to efficiently suck up the water vapor emitted by the strip in the event that it is in the evaporative phase and the combustion gases emitted by the radiant elements 3 s 'They operate on gas, as well as the air blown by the elements 2 which therefore do not disturb the operation of the infrared elements.

Of course, the invention is not limited to examples of realization that we have just described and we can make many changes to them without depart from the scope of the invention.

Claims (16)

  1. Convecto-radiative heat treatment system a band (1) moving opposite infrared radiant elements (3) and elements air blowers (2) on this strip (1), comprising a succession of blowing elements (2) separated from each other others by at least one infrared radiant element (3), characterized in that each blowing element (2) includes a suction element on each side (4) extending near an infrared radiant element (3).
  2. Installation according to claim 1 characterized in that each blowing element (2) comprises near the strip (1) at least one slot (8) of air supply, transverse to the direction movement (D) of the strip (1).
  3. Installation in accordance with one of the claims 1 to 2, characterized in that each suction element (4) includes near the strip (1) a suction mouth (9) forming an acute dihedral with the adjacent end wall (10) of the element blowing (2).
  4. Installation according to claim 3, characterized in that the edge (11) of the mouth closest to the strip (1) is connected with the side wall (12) of the element suction (4) by a broken wall (13).
  5. Installation in accordance with one of the Claims 1 to 4, characterized in that infrared radiant elements (3) and elements blowers (2) and extractors (4) are located on each side of the strip (1).
  6. Installation according to claim 5, characterized in that said elements (3, 2, 4) are symmetrically arranged on either side of the strip (1).
  7. Installation according to claim 5, characterized in that the elements (3, 2, 4) located on one side of the strip (1) are offset, in the direction of displacement (D) of the strip (1) relative to the elements (3, 2, 4) located on the other side of the strip (1), of so that the infrared radiant elements (3) located on one side are arranged opposite the blowing (2) and suction (4) elements located on the other side.
  8. Installation in accordance with one of the Claims 1 to 4, characterized in that on one sides of the strip (1) are arranged in succession radiant elements (3) and blowing elements (2) and aspirants (4), while on the other side are arranged only blowing elements (2).
  9. Installation according to claim 8, characterized in that on the side opposite to the elements radiators (3) are arranged reflectors between the blowing elements (2).
  10. Installation according to claim 9, characterized in that the reflectors serve suction elements.
  11. Installation in accordance with one of the Claims 1 to 4, characterized in that on one sides of the strip (1) are arranged in succession radiant elements (3) and blowing elements (2) and aspirants (4), while on the other side are arranged only blowing (2) and suction (4) elements.
  12. Installation according to claim 11, characterized in that on the side opposite to the elements radiators are arranged reflectors between the blowing and suction elements.
  13. Installation in accordance with one of the claims 1 to 12, characterized in that the distribution of infrared radiant elements (3) and / or blowing (2) and suction (4) elements vary the along the direction of movement of the strip (1).
  14. Installation in accordance with one of the claims 1 to 13, characterized in that the infrared radiant elements are burners gas-fired radiant heaters.
  15. Installation in accordance with one of the claims 1 to 14, characterized in that the infrared radiant elements are emitters radiant heaters powered by electricity.
  16. Installation in accordance with one of the claims 1 to 15, characterized in that the arrangement of radiant, blower and aspirants provides a non-straight path of the band.
EP19980402768 1997-11-14 1998-11-06 Combined convective-radiative system for heat treatment of a web Expired - Lifetime EP0916915B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9714321A FR2771161B1 (en) 1997-11-14 1997-11-14 Convecto-radiative system for heat treatment of a continuous band
FR9714321 1997-11-14

Publications (2)

Publication Number Publication Date
EP0916915A1 true EP0916915A1 (en) 1999-05-19
EP0916915B1 EP0916915B1 (en) 2001-07-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980402768 Expired - Lifetime EP0916915B1 (en) 1997-11-14 1998-11-06 Combined convective-radiative system for heat treatment of a web

Country Status (12)

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US (1) US6088930A (en)
EP (1) EP0916915B1 (en)
JP (1) JP4190630B2 (en)
CN (1) CN1110678C (en)
AR (1) AR017621A1 (en)
AT (1) AT203103T (en)
AU (1) AU734667B2 (en)
BR (1) BR9805018A (en)
CA (1) CA2252702A1 (en)
DE (1) DE69801088T2 (en)
ES (1) ES2161027T3 (en)
FR (1) FR2771161B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1030149A1 (en) * 1999-02-18 2000-08-23 Solaronics Process SA Combined blowing and suction device with integral energy exchange for a drying apparatus
EP2772362A1 (en) * 2013-03-01 2014-09-03 S. Dana Seccombe Apparatus and method for non-contact manipulation, conditioning, shaping and drying of surfaces

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FI105936B (en) * 1999-03-18 2000-10-31 Valmet Corp Method and apparatus for stabilizing the course of a web in a paper machine or the like
DE10303228B3 (en) * 2003-01-28 2004-04-15 Kramer, Carl, Prof. Dr.-Ing. Device for heat treating metallic strips has a heat treatment section containing a heating region and a first cooling region, and nozzle fields for producing impact beams onto the strips
US7116900B2 (en) * 2003-04-01 2006-10-03 Radiant Optics, Inc. Radiant energy source systems, devices, and methods capturing, controlling, or recycling gas flows
WO2004090424A2 (en) * 2003-04-01 2004-10-21 Radiant Optics, Inc. Radiant energy source systems, devices and methods
FR2867263B1 (en) 2004-03-02 2006-05-26 Solaronics Irt Drying installation for a tilting strip, in particular for a paper strip
US7926200B2 (en) 2004-03-02 2011-04-19 Nv Bekaert Sa Infrared drier installation for passing web
JP2005305794A (en) * 2004-04-21 2005-11-04 Komori Corp Dryer for sheet-like object
DE102005054995B4 (en) * 2005-07-28 2014-03-13 Otto Junker Gmbh Nozzle system for the treatment of sheet material
CN101375123B (en) * 2006-01-25 2011-06-08 贝卡尔特股份有限公司 Flame dryer
JP2010516984A (en) * 2006-01-25 2010-05-20 ナムローゼ・フェンノートシャップ・ベーカート・ソシエテ・アノニムN V Bekaert Societe Anonyme Flame drying equipment
US7966743B2 (en) 2007-07-31 2011-06-28 Eastman Kodak Company Micro-structured drying for inkjet printers
DE102007051963A1 (en) 2007-10-31 2009-05-07 Voith Patent Gmbh Web dryer arrangement
JP4736000B2 (en) * 2009-06-04 2011-07-27 アイケー・エス株式会社 Heat treatment furnace
US8465578B2 (en) 2011-03-31 2013-06-18 Eastman Kodak Company Inkjet printing ink set
US8398223B2 (en) 2011-03-31 2013-03-19 Eastman Kodak Company Inkjet printing process
JP5682460B2 (en) * 2011-06-07 2015-03-11 王子ホールディングス株式会社 Method for producing coated paper for printing
US9427975B2 (en) 2014-06-12 2016-08-30 Eastman Kodak Company Aqueous ink durability deposited on substrate
EP3510331B1 (en) 2016-09-08 2020-06-03 Solaronics S.A. Combined convection and radiation system for heat treatment of a continuous strip
WO2018046509A1 (en) 2016-09-08 2018-03-15 Solaronics S.A. Convective hood for heat treatment of a continuous strip

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FR1340311A (en) * 1962-09-06 1963-10-18 Chantiers De Nantes Atel A drying displaced longitudinally flexible strips
DE1951345A1 (en) * 1969-10-11 1971-04-15 Vits Maschinenbau Method and apparatus for guiding a web beruehrungslosen
FR2247687A1 (en) * 1973-10-12 1975-05-09 Buettner Schilde Haas Ag
FR2306733A1 (en) * 1975-04-08 1976-11-05 Ppg Industries Inc An air cooling to a treatment in ultraviolet light device
US4594795A (en) * 1984-10-23 1986-06-17 Erik Stephansen Air bearing support apparatus for drying a moving web
EP0235723A2 (en) * 1986-03-06 1987-09-09 Contiweb B.V. Stork Device for the floating guiding of material webs by means of a gas or a liquid
WO1988008950A1 (en) * 1987-05-09 1988-11-17 Kurt Krieger Device for float conveying of material webs
EP0291832A1 (en) * 1987-05-16 1988-11-23 Hilmar Vits Device for drying of freely guided material webs by air cushion nozzles
EP0346081A1 (en) * 1988-06-07 1989-12-13 W.R. Grace &amp; Co.-Conn. Air float bar
EP0508254A1 (en) * 1991-04-12 1992-10-14 Van Brandwijk Systems Programming B.V. Process and apparatus for heat treatment of a web having a fluid or paste-like composition applied to it
EP0539013A1 (en) * 1991-10-24 1993-04-28 W.R. Grace &amp; Co.-Conn. Combination infrared and air flotation dryer
DE29602178U1 (en) * 1996-02-08 1996-04-04 Vits Maschinenbau Gmbh Hover dryer, in particular offset dryer
US5606805A (en) * 1996-04-01 1997-03-04 Meyer; Jens-Uwe Process for drying a coated moving web
WO1998034079A1 (en) * 1997-02-05 1998-08-06 Megtec Systems, Inc. High speed infrared/convection dryer

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DE2908348A1 (en) * 1979-03-03 1980-09-04 Vits Maschinenbau Gmbh Floating dryer
FI78756C (en) * 1988-04-25 1989-09-11 Valmet Paper Machinery Inc Method and apparatus for drying a moving web
US5537925A (en) * 1993-09-03 1996-07-23 Howard W. DeMoore Infra-red forced air dryer and extractor
GB9323954D0 (en) 1993-11-19 1994-01-05 Spooner Ind Ltd Improvements relating to web drying
US5588223A (en) * 1994-06-14 1996-12-31 Asea Brown Boveri Inc. Restrained paper dryer
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Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1340311A (en) * 1962-09-06 1963-10-18 Chantiers De Nantes Atel A drying displaced longitudinally flexible strips
DE1951345A1 (en) * 1969-10-11 1971-04-15 Vits Maschinenbau Method and apparatus for guiding a web beruehrungslosen
FR2247687A1 (en) * 1973-10-12 1975-05-09 Buettner Schilde Haas Ag
FR2306733A1 (en) * 1975-04-08 1976-11-05 Ppg Industries Inc An air cooling to a treatment in ultraviolet light device
US4594795A (en) * 1984-10-23 1986-06-17 Erik Stephansen Air bearing support apparatus for drying a moving web
EP0235723A2 (en) * 1986-03-06 1987-09-09 Contiweb B.V. Stork Device for the floating guiding of material webs by means of a gas or a liquid
WO1988008950A1 (en) * 1987-05-09 1988-11-17 Kurt Krieger Device for float conveying of material webs
EP0291832A1 (en) * 1987-05-16 1988-11-23 Hilmar Vits Device for drying of freely guided material webs by air cushion nozzles
EP0346081A1 (en) * 1988-06-07 1989-12-13 W.R. Grace &amp; Co.-Conn. Air float bar
EP0508254A1 (en) * 1991-04-12 1992-10-14 Van Brandwijk Systems Programming B.V. Process and apparatus for heat treatment of a web having a fluid or paste-like composition applied to it
EP0539013A1 (en) * 1991-10-24 1993-04-28 W.R. Grace &amp; Co.-Conn. Combination infrared and air flotation dryer
DE29602178U1 (en) * 1996-02-08 1996-04-04 Vits Maschinenbau Gmbh Hover dryer, in particular offset dryer
US5606805A (en) * 1996-04-01 1997-03-04 Meyer; Jens-Uwe Process for drying a coated moving web
WO1998034079A1 (en) * 1997-02-05 1998-08-06 Megtec Systems, Inc. High speed infrared/convection dryer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1030149A1 (en) * 1999-02-18 2000-08-23 Solaronics Process SA Combined blowing and suction device with integral energy exchange for a drying apparatus
EP2772362A1 (en) * 2013-03-01 2014-09-03 S. Dana Seccombe Apparatus and method for non-contact manipulation, conditioning, shaping and drying of surfaces
US9272301B2 (en) 2013-03-01 2016-03-01 S. Dana Seccombe Apparatus and method for non-contact manipulation, conditioning, shaping and drying of surfaces

Also Published As

Publication number Publication date
CN1226674A (en) 1999-08-25
JP4190630B2 (en) 2008-12-03
CN1110678C (en) 2003-06-04
AT203103T (en) 2001-07-15
FR2771161A1 (en) 1999-05-21
AR017621A1 (en) 2001-09-12
CA2252702A1 (en) 1999-05-14
FR2771161B1 (en) 2000-01-14
US6088930A (en) 2000-07-18
ES2161027T3 (en) 2001-11-16
AU9138598A (en) 1999-06-03
JPH11217628A (en) 1999-08-10
EP0916915B1 (en) 2001-07-11
DE69801088D1 (en) 2001-08-16
DE69801088T2 (en) 2001-10-31
AU734667B2 (en) 2001-06-21
BR9805018A (en) 2001-03-20

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