EP0937956A1 - Apparatus for heat treatment of continuously moving webs - Google Patents

Apparatus for heat treatment of continuously moving webs Download PDF

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Publication number
EP0937956A1
EP0937956A1 EP19990420045 EP99420045A EP0937956A1 EP 0937956 A1 EP0937956 A1 EP 0937956A1 EP 19990420045 EP19990420045 EP 19990420045 EP 99420045 A EP99420045 A EP 99420045A EP 0937956 A1 EP0937956 A1 EP 0937956A1
Authority
EP
European Patent Office
Prior art keywords
air
assembly
infrared
module
blowing
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.)
Withdrawn
Application number
EP19990420045
Other languages
German (de)
French (fr)
Inventor
Michel Guenault
Grégoire Lizé
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.)
Ets Madeleine Sa
Infra Rouge System
Original Assignee
Ets Madeleine Sa
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
Priority to FR9802225A priority Critical patent/FR2775065B1/en
Priority to FR9802225 priority
Application filed by Ets Madeleine Sa, Infra Rouge System filed Critical Ets Madeleine Sa
Publication of EP0937956A1 publication Critical patent/EP0937956A1/en
Withdrawn legal-status Critical Current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

The apparatus to apply a heat treatment to continuous materials (1) has an infrared radiator module (7) which is located in the section over the assembly (2) for air blowing and suction within the assembly (2). Coolant air (11,12) is taken from the infrared units (8) in the module (7), to be collected and injected into the air blowers (4) to give heated air without using external heating. Fresh air is preheated by passing it through the infrared radiator module (7), and coolant air is chilled by a heat exchanger (13), where extracted air from the blowing/suction assembly (2) is also passed through. The extracted air contains water and other evaporated products for evacuation.

Description

The present invention relates to the field of manufacture and processing of sheet materials, such as than papers or films or textile products, or sheet metal products, and it relates, more particularly to a device intended for the treatment thermal of this kind of material, for example in order to their drying, this treatment being carried out on the material in continuously moving sheet, in the form of a strip uninterrupted more or less wide. he can here, in particular, paper manufacturing layer.

At present, in the field of stationery and more particularly in layer drying, after the deposition of a layer by an appropriate machine, water should be removed as quickly as possible contained in the paper, by a drying operation. AT this effect it is usual to install, just after the diaper deposition machine, a transmitter device infrared radiation, electric or gas type, for reach a certain level of humidity which allows the contact of the paper with a detour cylinder, before put the paper in a drying hood, this less in the facilities currently the more fast.

This known configuration requires significant infrared radiation powers because, taking into account machine speeds, densities of high radiation is needed to penetrate in a very short time a significant amount of energy in the sheet, in order to obtain a rise in temperature important. Then, it is advisable to continue the contribution caloric to evaporate the leaf, and finally drain off the evaporated water. For these latter operations, the the most common technique is to use a cooker hood air cushion that the paper passes through without any contact mechanical, the sheet being suspended between the two streams air, one lower and the other upper. To perform a heat transfer, the air blown to forming said streams is heated, and the action of these same air flow allows evacuating water to evaporate. The hood air cushion thus combines a thermal effect and a mass transfer effect to evacuate water extracted from the sheet by the thermal effect.

The main drawback of such hoods, used in stationery, is their low heat transfer capacity. However, the more paper operate at high speed, the higher the quantity of water to evaporate increases, and the more the size of the hoods used becomes important, these thus tending to be longer and longer.

However, from a certain limit, the size of hoods used affects stability and maneuverability of the sheet that runs through them. In particular, the sheet becomes difficult to control, because the distance between two points that can guide it widens until it becomes critical. This results in a increased risk of leaf breakage, risk that is returned all the more important as the speeds of sheet and air flow.

In addition, attempts to increase the heat transfer by increasing temperatures and air flow velocities lead to heating excessive leaf, which may result in destruction of the sheet or, at least, of part of it.

We also know, by documents such as patent applications WO 8809845 A, DE 4029488 A, WO 8904890 A and FR 2630532 A, drying installations strip products, including paper, which include an infrared radiation module in particular with electric infrared emitters, module to which follows, further down in the direction of travel of the sheet material, a blowing assembly and air intake. In all these achievements, the infrared module is completely dissociated from the assembly blowing and suction air, and located outside from this set, from which it can be separated by a interval (case of document WO 8809845 A) or even by a thermally insulating wall (case of the document WO 8904890 A). The only real link between the module infrared, on the one hand, and the blowing assembly and suction, on the other hand, is therefore that ensured by the air circulation between these two parts. The result significant energy losses, so that the overall performance of such facilities can only currently exceed 30 to 40%.

The present invention aims to eliminate all disadvantages previously outlined, providing a device which, for a space requirement in length strongly reduced, significantly improves overall thermal efficiency and avoids the risk of breakage or destruction of the treated leaf.

To this end, the present invention relates to a device for the heat treatment of materials in continuously scrolling sheet, comprising at least one module of infrared radiation, comprising emitters of electric type, and a blowing assembly and air intake, traversed longitudinally by the sheet material, the device being characterized in that the infrared emitter module is incorporated in the upstream part of the blowing assembly and air intake, inside this set.

So, contrary to the teaching of all aforementioned documents, the invention proposes to integrate indoor infrared emitters a device such as an air cushion hood for the evacuation of the water contained in a sheet, in particular of paper. In this way we remove causes of energy loss, because all the energy dissipated by the infrared module remains inside the hood, and therefore finds usable.

In operation, after a temperature rise of the sheet provided by conventional equipment at gas or electricity (located upstream of the the invention), the heat transfer will be made by the infrared radiation directed onto the sheet. The air blown and aspirated, especially downstream of the transmitter module infrared radiation, will no longer have functions essential than performing mass transfer, i.e. the evacuation of the water evaporated by the energy contribution of infrared radiation, and also to support the leaf while scrolling.

Such a device can therefore operate with low air temperatures, of the order of 110 to 130 ° C. Advantageously, the device comprises means which return the cooling air from the transmitters infrared of the aforementioned module and which then inject this air in the air heating boxes, without intake of external energy to heat the air. We will also note that a pre-heating of the fresh air, directed towards the module infrared radiation emitter to ensure its cooling, is achievable by means of an exchanger also crossed by the air extracted from the assembly blowing and suction, this extract air containing water or other evaporated product to drain.

Thanks to these provisions, the thermal efficiency of the device (yield 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 overall efficiency of the device which is about 75% to 80%, while the current infrared systems do not exceed 30 or 40% while the efficiency of an air flow transfer is about 70%.

As a direct result of this excellent yield, the invention makes it possible to reduce from two to four times the length of the device, compared to a conventional hood, allowing for example a passage with a length of 9 meters to a length of 3 meters, which gives reduced free leaf lengths, very favorable for fast machines. Thanks to this important 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 attached drawing, which very clearly represents schematic, in longitudinal section, a device according to the present invention.

The device shown in the drawing ensures the heat treatment, including drying, of a material in sheet designated by the reference 1, which scrolls continuously in the direction indicated by the arrow F, i.e. from right to left with reference to the figure. Sheet material 1 thus passes longitudinally through a blowing assembly and air intake, generally designated by the reference 2. Before reaching this set 2, the material sheet 1 goes through a temperature rise equipment not shown, located upstream of said assembly 2 and does not not the subject of the present invention.

Blowing and air suction assembly 2 includes an upper part 3, surmounting the material in sheet 1 to be treated, and a lower part 4, located below the path of this sheet material 1. These two parts 3 and 4 in the form of boxes include, distributed over their length, of the organs respectively designated by 5 and 6, which provide blowing and air intake, as suggested by the small arrows f, so as in particular to ensure the levitation of the sheet material 1, in its crossing of the assembly 2.

According to the invention, a radiation module infrared 7 is incorporated in the upstream part of the blowing and air suction assembly 2, at inside this set 2. Module 7 here includes, on the side of the upper part 3 of the assembly 2, infrared emitters 8 of electrical type. This module 7 is completed, on the side of the lower part 4 of the assembly 2, by a reflector 9 located opposite the infrared emitters 8. Regarding the position of the infrared radiation module 7, it will be noted that some blowing and air intake units 5 and 6 can be located upstream of this module 7, as shown on the face.

The infrared radiation module 7 comprises, for cooling its infrared emitters 8, a fresh air supply 10 from outside. On leaving module 7, the air from warmed cooling is injected through appropriate guide 11, in the air supply box that constitutes the upper part 3 of the assembly 2, and this air is also brought through a duct 12 into the box consisting of the lower part 4.

Fresh air, coming from outside, flows through a heat exchanger 13 before reaching supply in air 10 of the module 7. The exchanger 13 is also traversed by the extracted air, coming directly from the part upper 3 of the suction blowing assembly 2, and indirectly (via a conduit 14) from the bottom 4 of this assembly 2, this air then being directed towards a evacuation.

During operation, the infrared radiation 7 provides heat transfer to the sheet material 1, as it enters the assembly 2. The cooling air of the infrared emitters 8, escaping from module 7, enters the boxes of the parts 3 and 4. From these boxes, forming zones of mixing, the air is directed to the sheet material 1 and taken up by the blowing and suction organs 5, 6, so as to ensure on the one hand the sustenance of the sheet material 1, and on the other hand the transfer of mass, that is to say the entrainment of the water put evaporation, on said sheet material 1, by the contribution energy from infrared radiation from module 7.

The hot air extracted, containing the evaporated water, passes through the exchanger 13 which preheats the fresh air directed to the infrared radiation module 7. The extraction of extracted air also ensures extraction evaporated water, and the sheet material 1 comes out of the whole 2 being dried.

The device, previously described, applies especially in the fields of paper, synthetic films and textile products, during manufacture or treatment. This device can also be applied to processing of sheet metal products, for example for drying coatings deposited on such products metallic.

Claims (3)

  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 drying them, the device comprising at least one infrared radiation module (7) , comprising infrared emitters (8) of the electrical type, and an assembly (2) for blowing and sucking air, traversed longitudinally by the sheet material (1), characterized in that the infrared emitter module ( 7) is incorporated in the upstream part of the blowing and air suction assembly (2), inside this assembly (2).
  2. Device according to claim 1, characterized in that it comprises means (11,12) which return the cooling air from the transmitters infrared (8) of the aforementioned module (7) and which inject then this air in the air supply boxes (3,4), without external energy supply to heat the air.
  3. Device according to claim 1 or 2, characterized in that a preheating of the fresh air, directed to the infrared emitter module (7) to ensure its cooling, is achieved by means of a heat exchanger (13) also traversed by the extracted air of the blowing and suction assembly (2), this air extract containing water and other product evaporated at clear out.
EP19990420045 1998-02-19 1999-02-18 Apparatus for heat treatment of continuously moving webs Withdrawn EP0937956A1 (en)

Priority Applications (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
FR9802225 1998-02-19

Publications (1)

Publication Number Publication Date
EP0937956A1 true EP0937956A1 (en) 1999-08-25

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EP19990420045 Withdrawn EP0937956A1 (en) 1998-02-19 1999-02-18 Apparatus for heat treatment of continuously moving webs

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2166298A3 (en) * 2008-09-22 2012-10-24 Voith Patent GmbH Web of material drying device
EP2166299A3 (en) * 2008-09-22 2012-10-24 Voith Patent GmbH Web of material drying device

Citations (11)

* 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
GB1480076A (en) * 1973-10-12 1977-07-20 Buettner Schilde Haas Ag Deflected-stream dryers for drying web material
US4336279A (en) * 1978-07-04 1982-06-22 Metzger Wesley A Apparatus and process for drying and curing coated substrates
US4379435A (en) * 1981-10-19 1983-04-12 Northern Telecom Limited Drying oven for indefinite length material
US4756091A (en) * 1987-06-25 1988-07-12 Herbert Van Denend Hybrid high-velocity heated air/infra-red drying oven
WO1988007103A1 (en) * 1987-03-11 1988-09-22 Valmet Paper Machinery Inc. Arrangement for drying a running web
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
WO1998034079A1 (en) * 1997-02-05 1998-08-06 Megtec Systems, Inc. High speed infrared/convection dryer

Patent Citations (11)

* 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
GB1480076A (en) * 1973-10-12 1977-07-20 Buettner Schilde Haas Ag Deflected-stream dryers for drying web material
US4336279A (en) * 1978-07-04 1982-06-22 Metzger Wesley A Apparatus and process for drying and curing coated substrates
US4379435A (en) * 1981-10-19 1983-04-12 Northern Telecom Limited Drying oven for indefinite length material
WO1988007103A1 (en) * 1987-03-11 1988-09-22 Valmet Paper Machinery Inc. Arrangement for drying a running web
WO1988009845A1 (en) * 1987-06-04 1988-12-15 Valmet Paper Machinery Inc. Method in the drying of a paper web or equivalent
US4756091A (en) * 1987-06-25 1988-07-12 Herbert Van Denend Hybrid high-velocity heated air/infra-red drying oven
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
WO1998034079A1 (en) * 1997-02-05 1998-08-06 Megtec Systems, Inc. High speed infrared/convection dryer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2166298A3 (en) * 2008-09-22 2012-10-24 Voith Patent GmbH Web of material drying device
EP2166299A3 (en) * 2008-09-22 2012-10-24 Voith Patent GmbH Web of material drying device

Also Published As

Publication number Publication date
FR2775065A1 (en) 1999-08-20
FR2775065B1 (en) 2000-05-26

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