FR2775065A1 - Device for the heat treatment of continuously moving sheet materials - Google Patents

Device for the heat treatment of continuously moving sheet materials Download PDF

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Publication number
FR2775065A1
FR2775065A1 FR9802225A FR9802225A FR2775065A1 FR 2775065 A1 FR2775065 A1 FR 2775065A1 FR 9802225 A FR9802225 A FR 9802225A FR 9802225 A FR9802225 A FR 9802225A FR 2775065 A1 FR2775065 A1 FR 2775065A1
Authority
FR
France
Prior art keywords
air
sheet
infrared radiation
module
heat treatment
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
FR9802225A
Other languages
French (fr)
Other versions
FR2775065B1 (en
Inventor
Gregoire Lize
Michel Guenault
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.)
Infra Rouge System
Original Assignee
Infra Rouge System
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 Infra Rouge System filed Critical Infra Rouge System
Priority to FR9802225A priority Critical patent/FR2775065B1/en
Publication of FR2775065A1 publication Critical patent/FR2775065A1/en
Application granted granted Critical
Publication of FR2775065B1 publication Critical patent/FR2775065B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • 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

Abstract

<P> The device relates to the heat treatment, in particular the drying, of sheet materials such as paper or films or textile products, or even metal sheet products, continuously scrolling. At least one infrared radiation module (7) is incorporated in the upstream part of a blowing and air suction assembly (2), traversed longitudinally by the sheet material (1). This improves the thermal efficiency of this assembly (2), while greatly reducing its length. Special application: layer drying in stationery. </P>

Description

The present invention relates to the field of manufacturing and

  treatment of sheet materials, such as paper or film or textile products, or even metal sheet products, and it relates, more particularly, to a device intended for the heat treatment of this type of material, for example with a view to drying them , this treatment being carried out on the sheet material traveling continuously, in the form of an uninterrupted strip of greater or lesser width. In particular, this may involve the manufacture of coated paper. At present, in the stationery sector and more particularly in layer drying, after the deposition of a layer by an appropriate machine, the water contained in the paper should be removed as quickly as possible. a drying operation. For this purpose it is usual to install, just after the layer deposition machine, an apparatus emitting infrared radiation, of the electric or gas type, to reach a certain level of humidity which allows the contact of the paper with a detour cylinder, before putting the paper in a drying hood, at least in the currently fastest installations. This known configuration requires significant infrared radiation powers because, taking into account the speeds of the machines, high radiation densities are required to cause a significant amount of energy to penetrate the sheet in a very short time, in order to obtain a rise. at high temperature. Then, it is advisable to continue the caloric intake to put the leaf in evaporation, and finally to evacuate the evaporated water. For these latter operations, the most common technique consists in using an air cushion hood which the paper passes through without any mechanical contact, the sheet being suspended between the two air flows, one lower and the other upper. . In order to carry out a thermal transfer, the air blown to form said flows is heated, and the action of these same air flows makes it possible to evacuate the water which evaporates. The air cushion hood thus combines a thermal effect and a mass transfer effect allowing water to be evacuated

  extracted from the sheet by the thermal effect.

  The main drawback of such hoods, used in the stationery field, is their low heat transfer capacity. However, the more the paper machines operate at high speed, the more the amount of water to be evaporated, and the larger the size of the hoods used becomes larger, these tending to

be longer and longer.

  However, above a certain limit, the size of the hoods used influences the stability and maneuverability of the sheet that runs through them. In particular, the sheet becomes difficult to control, because the distance between two points which can guide it widens until it becomes critical. This results in an increased risk of breakage of the sheet, a risk which is made all the more important by increasing the speeds of

sheet and air flow.

  In addition, attempts to increase heat transfer by increasing temperatures and air flow rates lead to excessive heating of the sheet, which can result in destruction of the sheet or, at least, a part

of it.

  The present invention aims to eliminate these drawbacks by providing a device which, for a greatly reduced overall length, significantly improves the thermal efficiency and avoids the risks of

  breakage or destruction of the treated leaf.

  To this end, the subject of the present invention is a device for the thermal treatment of continuously moving sheet materials, which comprises at least one module emitting infrared radiation, incorporated in the upstream part of a blowing and suction assembly. of air, traversed longitudinally by the sheet material. Thus, the invention proposes to integrate infrared radiation emitters in a device such as an air cushion hood used for the evacuation of

  the water contained in a sheet, especially of paper.

  Consequently, after a temperature rise of the sheet provided by conventional gas or electric equipment (located upstream of the device of the invention), the heat transfer will be made by the infrared radiation directed on the sheet, and no longer by heated air flows. The blown and sucked air, in particular downstream of the infrared radiation emitting module, will no longer have as essential functions than to carry out the mass transfer, that is to say the evacuation of the evaporated water. by the energetic contribution of infrared radiation, and also to ensure

  the lift of the scrolling leaf.

  Such a device can therefore operate with low air temperatures, of the order of 110 to 130 C. Advantageously, the device comprises means which take up the cooling air from the infrared emitters of the aforementioned module and which then inject this air in air heating boxes, without external energy input to heat the air. It will also be noted that a preheating of the fresh air, directed towards the infrared radiation emitting module to ensure its cooling, is achievable by means of a heat exchanger also traversed by the extracted air, containing

  water or other evaporated product to drain.

  Thanks to these provisions, the thermal efficiency of the device (efficiency of the transfer operation of

  heat from the source to the leaf) is excellent.

  The invention thus makes it possible to use transmitters

  electric type infrared, with an efficiency which is about 80%, whereas current infrared systems do not exceed 30 or 40% while the efficiency of an air flow transfer is about 70%.

  As a direct consequence of this excellent yield, the invention makes it possible to reduce the length of the device from two to four times, compared with a conventional hood, by allowing for example a passage from a length of 9 meters to a length of 3 meters. , which gives reduced free sheet lengths, very favorable for fast machines. Thanks to this significant shortening, the device which is the subject of the invention can also be inserted

  without difficulty in existing installations.

  The invention will in any case be better understood at

  using the following description, with reference to the unique

  figure of the appended drawing, which very schematically represents, in longitudinal section, a device

according to the present invention.

  The device shown in the drawing provides heat treatment, in particular drying, of a sheet material designated by the reference 1, which runs continuously in the direction indicated by the arrow F, that is from right to left with reference to the figure. The sheet material 1 thus passes longitudinally through a blowing and air suction assembly, generally designated by the reference 2. Before reaching this assembly 2, the sheet material 1 passes through a temperature rise equipment not shown. , located upstream of said set 2 and does not

  not the subject of the present invention.

  The assembly 2 comprises an upper part 3, surmounting the sheet material 1 to be treated, and a lower part 4, located below the path 2 of this sheet material 1. These two parts 3 and 4 in the form of boxes comprise, distributed over their length, members respectively designated by 5 and 6, which provide blowing and aspiration of air, as suggested by the small arrows f, so as in particular to ensure the levitation of the sheet material 1, in her

crossing of the set 2.

  According to the invention, an infrared radiation module 7 is incorporated in the upstream part of the blowing and air suction assembly 2. The module 7 here comprises, on the side of the upper part 3 of the assembly 2, infrared emitters 8 of the electrical type. This module 7 is completed, on the side of the lower part 4 of the assembly 2, by a reflector 9 located at

  view of infrared emitters 8.

  The infrared radiation module 7 comprises, for the cooling of its infrared emitters 8, a supply of fresh air 10 coming from the outside. On leaving the module 7, the heated cooling air is injected, by suitable guide ducts 11, into the air blowing box which constitutes the upper part 3 of the assembly 2, and this air is also supplied. by a conduit 12 in the box

  consisting of the lower part 4.

  The fresh air, coming from outside, flows through a heat exchanger 13 before reaching the air supply 10 of the module 7. The exchanger 13 is also traversed by the extracted air, coming directly from the upper part 3 of the assembly 2, and indirectly (via a conduit 14) from the lower part 4, this air being

  then directed to an evacuation.

  During operation, the infrared radiation module 7 provides thermal transfer to

  the sheet material 1, as it enters the assembly 2.

  The cooling air of the infrared emitters 8, escaping from the module 7, enters the boxes of parts 3 and 4. From these boxes, forming mixing zones, the air is directed towards the sheet material 1 and taken up by the blowing and suction members 5, 6, so as to ensure on the one hand the lifting of the sheet material 1, and on the other hand the mass transfer, that is to say the drive water evaporated on said sheet material 1 by the energetic contribution of infrared radiation from module 7. The extracted hot air, containing the evaporated water, passes through the exchanger 13 which performs a preheating of the fresh air directed towards the infrared radiation module 7. The evacuation of the extracted air also ensures the extraction of the evaporated water, and the sheet material 1 leaves

the whole 2 being dried.

  The device, previously described, applies in particular to the fields of paper, synthetic films and textile products, during manufacture or treatment. This device can also be applied to the treatment of metal sheet products, for example for the drying of coatings deposited on such metal products. Of course, the invention is not limited to the sole embodiment of this device for the heat treatment of continuously moving sheet materials, which has been described above by way of example; on the contrary, it embraces all variants of

  realization and application respecting the same principle.

Claims (4)

  1 - Device for the heat treatment of sheet materials, such as paper or films or textile products, or even metal sheet products, continuously scrolling, in particular with a view to their
  drying, characterized in that it comprises at least one infrared radiation module (7), incorporated in the upstream part of a blowing and air suction assembly (2), traversed longitudinally by the sheet material ( 1).
  2 - Device according to claim 1, characterized in that the infrared radiation module (7) comprises infrared emitters (8) of the type
electric.
  3 - Device according to claim 1 or 2 characterized in that it comprises means (11,12) which take up the cooling air from the infrared emitters (8) of the aforementioned module (7) and which then inject this air into the air supply boxes
  (3,4), without external energy supply to heat the air.
  4 - Device according to any one of claims 1 to 3, characterized in that a preheating
  fresh air, directed towards the infrared radiation emitting module (7) to ensure its cooling, is produced by means of a heat exchanger (13) also traversed by the extracted air, containing
  water or other evaporated product to drain.
FR9802225A 1998-02-19 1998-02-19 Device for the heat treatment of continuously moving sheet materials Expired - Fee Related FR2775065B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9802225A FR2775065B1 (en) 1998-02-19 1998-02-19 Device for the heat treatment of continuously moving sheet materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9802225A FR2775065B1 (en) 1998-02-19 1998-02-19 Device for the heat treatment of continuously moving sheet materials
EP19990420045 EP0937956A1 (en) 1998-02-19 1999-02-18 Apparatus for heat treatment of continuously moving webs

Publications (2)

Publication Number Publication Date
FR2775065A1 true FR2775065A1 (en) 1999-08-20
FR2775065B1 FR2775065B1 (en) 2000-05-26

Family

ID=9523307

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9802225A Expired - Fee Related FR2775065B1 (en) 1998-02-19 1998-02-19 Device for the heat treatment of continuously moving sheet materials

Country Status (2)

Country Link
EP (1) EP0937956A1 (en)
FR (1) FR2775065B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008042248A1 (en) * 2008-09-22 2010-04-01 Voith Patent Gmbh Web dryer arrangement
DE102008042247A1 (en) * 2008-09-22 2010-04-01 Voith Patent Gmbh Web dryer arrangement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4379435A (en) * 1981-10-19 1983-04-12 Northern Telecom Limited Drying oven for indefinite length material
WO1988009845A1 (en) * 1987-06-04 1988-12-15 Valmet Paper Machinery Inc. Method in the drying of a paper web or equivalent
WO1989004890A1 (en) * 1987-11-26 1989-06-01 Valmet Oy Method and device in on-machine coating-drying of a paper web or equivalent
FR2630532A1 (en) * 1988-04-25 1989-10-27 Valmet Paper Machinery Inc Continuous drying method and device consisting of an infrared gas dryer and an air-suspended belt dryer
DE4029488A1 (en) * 1989-09-25 1991-04-04 Valmet Paper Machinery Inc Paper web contactless drying - uses thermal energy from recovered coolant air from infrared dryer for under side of floating dryer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2405813A (en) * 1944-05-06 1946-08-13 B F Sturtevant Co Drier
DE2351280B2 (en) * 1973-10-12 1979-01-25 Babcock-Bsh Ag Vormals Buettner- Schilde-Haas Ag, 4150 Krefeld
US4336279A (en) * 1978-07-04 1982-06-22 Metzger Wesley A Apparatus and process for drying and curing coated substrates
WO1988007103A1 (en) * 1987-03-11 1988-09-22 Valmet Paper Machinery Inc. Arrangement for drying a running web
US4756091A (en) * 1987-06-25 1988-07-12 Herbert Van Denend Hybrid high-velocity heated air/infra-red drying oven
US5867920A (en) * 1997-02-05 1999-02-09 Megtec Systems, Inc. High speed infrared/convection dryer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4379435A (en) * 1981-10-19 1983-04-12 Northern Telecom Limited Drying oven for indefinite length material
WO1988009845A1 (en) * 1987-06-04 1988-12-15 Valmet Paper Machinery Inc. Method in the drying of a paper web or equivalent
WO1989004890A1 (en) * 1987-11-26 1989-06-01 Valmet Oy Method and device in on-machine coating-drying of a paper web or equivalent
FR2630532A1 (en) * 1988-04-25 1989-10-27 Valmet Paper Machinery Inc Continuous drying method and device consisting of an infrared gas dryer and an air-suspended belt dryer
DE4029488A1 (en) * 1989-09-25 1991-04-04 Valmet Paper Machinery Inc Paper web contactless drying - uses thermal energy from recovered coolant air from infrared dryer for under side of floating dryer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Also Published As

Publication number Publication date
FR2775065B1 (en) 2000-05-26
EP0937956A1 (en) 1999-08-25

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Effective date: 20091030