EP0305366A1 - Arrangement for drying a running web - Google Patents
Arrangement for drying a running webInfo
- Publication number
- EP0305366A1 EP0305366A1 EP19870902088 EP87902088A EP0305366A1 EP 0305366 A1 EP0305366 A1 EP 0305366A1 EP 19870902088 EP19870902088 EP 19870902088 EP 87902088 A EP87902088 A EP 87902088A EP 0305366 A1 EP0305366 A1 EP 0305366A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- web
- arrangement according
- heat
- unit
- 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- Withdrawn
Links
- 238000001035 drying Methods 0.000 title claims description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 7
- 238000001228 spectrum Methods 0.000 claims abstract description 4
- 230000004888 barrier function Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000011111 cardboard Substances 0.000 claims 1
- 230000020169 heat generation Effects 0.000 claims 1
- 239000000123 paper Substances 0.000 claims 1
- 239000011087 paperboard Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009834 vaporization Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/001—Drying webs by radiant heating
- D21F5/002—Drying webs by radiant heating from infrared-emitting elements
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
- F26B13/104—Supporting 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
Definitions
- the drying of the running web is rather important if the web is coated with a coating substance, which includes water as the fluency element.
- a coating substance which includes water as the fluency element.
- water maintains the fluency property of the substance and, hence, faciliates an incomplicated and easy working phase.
- a commonly used substance concentration includes about 40% of water, which must be removed from the levelled coating layer and the running web, in which a portion of the water amount has penetrated.
- a typical method to dry the web is to blow air streams either against or parallel to the web so, that the web is maintained contactless from air stream supply boxes, and preferably at a predetermined fixed distance from them.
- Unit 8 can also be in co-operation with a reflector 14 so that web 3 is running between unit 8 and reflector 14.
- web 3 is pre- and posttreated with a measure, which accelerates the vapour motion away from the vicinity of the web, which in turn decreases the saturation level near the web.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Textile Engineering (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
- Drying Of Solid Materials (AREA)
Abstract
L'agencement décrit sert à sécher une bande de papier en mouvement (3) par traitement thermique. Le traitement est effectué au moyen de sources émettrices de chaleur qui comprennent des unités thermiques séparées (8) pour l'émission de longueurs d'onde comprises dans des spectres de lumière infrarouge. L'unité thermique (8) est munie d'éléments réflecteurs de lumière. Cette unité thermique (8) comprend un élément de corps fermé en forme de boîte (18), qui s'étend sur la longueur transversale de la bande. L'unité de lampe (1) émettant des rayons infrarouges est placée dans cet élément de corps (18), tout comme les éléments d'admission (7) et d'émission d'air ainsi que les éléments de guidage (24; 6) qui servent à faire circuler les flux d'air à travers l'unité thermique (8) et à guider les flux d'air chauffés dans un espace situé entre l'unité thermique (8) et la bande en mouvement (3). L'élément d'admission (7) est relié à une source d'alimentation en air. L'élément de corps (18) comprend un élément en forme de plaque (6) faisant obstacle et placé entre la bande et l'unité de lampe émettrice (1). L'élément faisant obstacle (6) sert à empêcher l'air de s'écouler depuis l'intérieur (23) du corps en direction de la bande et laisse passer les longueurs d'onde de lumière infrarouge. La source d'alimentation en air, les éléments de guidage (24; 6) et l'élément faisant obstacle (6) sont disposés de façon à coopérer les uns avec les autres, permettant ainsi à l'air qui s'écoule entre la bande en mouvement (3) et l'élément obstacle (6) de produire un effet de coussin d'air, un effet Coanda ou similaire.The arrangement described serves to dry a moving strip of paper (3) by heat treatment. The treatment is carried out by means of heat emitting sources which comprise separate thermal units (8) for the emission of wavelengths included in infrared light spectra. The thermal unit (8) is provided with light reflecting elements. The thermal unit (8) includes a closed box-shaped body member (18) which extends over the transverse length of the strip. The lamp unit (1) emitting infrared rays is placed in this body element (18), as are the intake (7) and air emission elements as well as the guide elements (24; 6 ) which serve to circulate the air flows through the thermal unit (8) and to guide the heated air flows in a space between the thermal unit (8) and the moving strip (3). The intake element (7) is connected to an air supply source. The body member (18) includes an obstructing plate member (6) positioned between the strip and the emitting lamp unit (1). The obstructing element (6) serves to prevent air from flowing from the interior (23) of the body towards the strip and allows the wavelengths of infrared light to pass. The air supply source, the guide members (24; 6) and the obstructing member (6) are arranged to cooperate with each other, thereby allowing the air flowing between the moving band (3) and the obstacle element (6) to produce an air cushion effect, a Coanda effect or the like.
Description
ARRANGEMENT FOR DRYING A RUNNING WEB BACKGROUND OF THE INVENTION
The invention relates to an arrangement for drying a running web or the like by heat treatment, which is carried out by means of heat emitting sources, preferably by electrical heat means comprising at least one separate heat unit for the emittance of wavelengths in infrared light spectra. The heat unit is provided by light reflecting elements.
PRIOR ART
The drying of the running web is rather important if the web is coated with a coating substance, which includes water as the fluency element. During the application of coating substance onto the web and the levelling of the coating layer in a levelling member, say a nip member, water maintains the fluency property of the substance and, hence, faciliates an incomplicated and easy working phase. A commonly used substance concentration includes about 40% of water, which must be removed from the levelled coating layer and the running web, in which a portion of the water amount has penetrated. A typical method to dry the web is to blow air streams either against or parallel to the web so, that the web is maintained contactless from air stream supply boxes, and preferably at a predetermined fixed distance from them. This method is based on the application of unsaturated gas substance, which carriers away the vaporized water from the web and the coating layer. And as widely known, the vaporization is speeded up if the temperature of the wet coating or of the air stream is increased, the contact area between liquid and gas phases is enlarged, the saturation degree of the gas phase is decreased, the flow rate in the gas phase is increased or the penetration of the water vapour phase from the web/coating layer is speeded up.
A typical drying process is based on heated air which raises the temperature of the web and the wet coating substance. The heated air has an increased ability to receive watervapour, that is, the relative saturation of the air stream
is initially lowered by heating. It is important to realize an economical system and at the same time an effective vapour carrier media. A portion of the heated air stream is guided out of the heating process and replaced by an amount of insaturated and heated air. Hereby the total humidity amount carried by the air stream will not result in to a value too near the saturation point. The indirect heating of the wet web by means of the heated air is slow and rather ineffective, since the major part of the heated air hardly comes into contact with the web.
Another method is based on a direct heating of the wet web by means of infrared heating. If a suitable light spectra range is used, a quick and an even vapourization is possible. The direction of the infrared rays is effected by reflecting elements placed in co-operation with light emitting lamps. In this method, however, the air in the vicinity of the heat treated web does not move fast enough, and hence, the air is very near to the saturation point and the vapourization is hampered.
OBJECT AND SHORT DESCRIPTION OF THE INVENTION
The object of the invention is to create a drying arrangement, which includes the favourable properties of the devices of the prior art, and at the same time avoids the drawbacks of the prior art.
The object of the invention is realized by means of the arrangement presented in the main claim. The invented arrangement includes members for a direct heating of the wet web by infrared light and members for keeping the vapor saturation value at low level in the vicinity of the running web. The low level is maintained by a partial recirculation of the heated air streams which receive the heat from light emitter lamps. The air streams are governed to create an air cushion, Coanda or the like effect, so that the web is out of contact with the box-like body member extending over the
web transverse length. The infrared light penetrates through a barrier element located between the web and the lamp.
A portion of the air flow in the air cushion can be directed through recirculation elements back into the body member to be reheated. The heat economy is hereby positively effected. The air outtake members being properly arranged, the running web can be held at a predetermined distance from the barrier element.
A typical barrier element is a glass plate with low infrared light absoprion index. The best heat transfer effect, and the cooling of the hot infrared lamp, is possible by guiding the air circulation around the lamp, which can be placed parallel to web running direction or web transverse length. Another possibility Is to guide streams around a conversion member of the lamp, said conversion member being a typical eletricity-light emittance conversion element producing heat energy with high rate.
The outtake members can be elongated and parellely placed slots. A favourable set includes at least two separate heat units, placed for instance, so that each web side is treated at least by one unit.
The air streams from two neighbouring units can be either parallely or oppositely directed. The oppositely directed streams can either approach or move away from each other. If a number of heat units are placed in a row one after another in the web running direction, at least one unit directs air streams in a direction opposite to other streams.
BRIEF DESCRIPTION OF DRAWING
The invention is described more in detail with reference to the attached drawing in which fig 1 discloses an embodiment of the invention in a
general view and partly sectioned, - fig 2 shows a sectional side view of the device of fig 1, - fig 3-6 show some arrangements of a number of devices set in co-operation with a running web.
The heat unit is marked with reference numeral 8. An infrared emitter lamp 1 is provided by a reflector mirror 2 for directing and concentrating infrared light on a running web 3. Air stream 4 is guided through a slot 5 of a box-like body 18 into a space between web 3 and a glass plate 6, which forms the top (or bottom) cover of body 18. Body 18 is provided by an air tube 7 for the air intake into body 18. A favourable arrangement is such that air intake is carried out around the electric-light convension member 9 of lamp 1. If several units 8 are placed in a row, air flows from two neighbouring units 8 can be directed in several alternative ways 10-13 relative to each other or the web running direction 26. Unit 8 can also be in co-operation with a reflector 14 so that web 3 is running between unit 8 and reflector 14. In certain cases it is favourable to place ordinary air stream boxes 15,16 in co-operation with unit 8, whereby air streams from boxes 15,16 maintain web 3 at a fixed distance from unit 8. At the same time, web 3 is pre- and posttreated with a measure, which accelerates the vapour motion away from the vicinity of the web, which in turn decreases the saturation level near the web.
Body 18 can be further provided by air tube 17 for the recirculation of air stream indicated by numerals 4,10-13. The lamp cooling stream is marked with numeral 19, air circulation around lamp 1 by 20,21 and the space between glass 6 and web 3 by 22. The interior 23 of body 18 is not shown in detail. The front plate 24 of body 18 is shaped to guide air stream 4,10-13 in a suitable manner. A portion of air stream 4,10-13 is recirculated in body 18, this portion 25 is mixed in interior 23 with fresh stream 19. Reference numeral 27 refer to the recovery or collector elements of
the air recirculation system or to the outflow of air streams from heat unit 8 to the surrounding.
The invention is not limited to embodiment shown, but several modifications thereof are feasible within the scope of the attached claims.
Claims
1. An arrangement for drying a running paper web or the like by heat treatment, said treatment being carried out by means of heat emitting sources, preferably by electrical heat means comprising at least one separate heat unit for the emittance of wavelengths in infrared light spectra, said heat unit being provided by light reflecting elements, the improvement being in that said heat unit comprises a mainly closed box-like body member, which extends at least mainly over the web transverse length, or comprise a number of separate box-like body members arranged side-by-side to extend over said transverse length, at least one infrared emitter lamp unit in said body member, air intake and outtake members and guide elements for circulating air streams through said heat unit and guiding the heated air streams in a space between said heat unit and said running web, said intake member being connected to an air supply source, said body member comprising a plate-like barrier element located between said web and said emitter lamp unit, said barrier element preventing air to stream from said body interior towards the web and permitting the infrared light wavelengths to pass through said barrier element, said outtake members being extended or distributed mainly over said transverse web length and in co-operation with a first element of said guide elements, said barrier element forming a second element of said guide elements, said air supply source, guide elements and barrier element being arranged in co-operation so that the air flow between said web and said barrier element generates an air cushion effect, a Coanda-effect or the like.
2. Arrangement according to claim 1 in which said air intake members are provided with a connection member including a closure element, said connection member being located in the vicinity of said space between the web and the barrier unit, said connection faciliating a recirculation of said heated air flow, whereby said heated air flow forms a partial source of said air supply source.
3. Arrangement according to claim 1 or 2 in which said air outtake members include at least one, preferably unique, slot-like opening extending over said transverse length, whereby the geometry of said slot-like opening, barrier element and first guide element are so arranged that the distance between said running web and said barrier element is controlled by the air flow speed relative to the web speed.
4. Arrangement according to claim 1 or 2, in which said barrier element is a glass plate or the like.
5. Arrangement according to claim 1 or 2 , in which the circulation of air streams inside said body member is guided around said emitter, lamp unit, thereby providing a heat transmission effect from said lamp to the air streams.
6. Arrangement according to claim 5, in which the heated air streams are guided to and through said outtake members.
7. Arrangement according to claim 1 or 2, in which said elongated emitter lamps are mounted along said web transverse length.
8. Arrangement according to claim 1 or 2, in which said elongated emitter lamps are mounted in a parallel position relative to the web running direction.
9. Arrangement according to claim 1 or 2, in which said air outtake members comprise a number of parallel slot-like openings, which extend mainly over the body member in a direction parallel to the web running direction.
10. Arrangement according to claim 1 or 2, in which said intake member is connected to a separate air supply source containing air at ambient temperature, air streams from said source being mainly guided around a conversion member of said lamp unit, said conversion member converting electrical energy to light emission and heat generation.
11. Arrangement according to claim 1 or 2, in which said web is treated by at least two separate heat units.
12. Arrangement according to claim 11, in which both opposite sides of said web are faced by at least one heat unit.
13. Arrangement according to claim 11, in which air streams from two neighbouring heat units are parallelly directed.
14. Arrangement according to claim 11, in which air streams from two neighbouring heat units are oppositely directed, either approaching each other or moving away.
15. Arrangement according to claim 14, in which a number of consecutive heat units generate air streams, of which at least one is oppositely directed relative to other air streams.
16. Arrangement according to claim 1 or 2, in which said heat unit is arranged in co-operation with a separate air stream supplying unit, which generates an air cushion effect, a Goanda-effect or the like.
17. Arrangement according, to claim 1 or 2, in which said heat unit is applied for treating a running paper or cardboard web in a papermaking machine, a calander, a coater or the like.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FI1987/000031 WO1988007103A1 (en) | 1987-03-11 | 1987-03-11 | Arrangement for drying a running web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0305366A1 true EP0305366A1 (en) | 1989-03-08 |
Family
ID=8556418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19870902088 Withdrawn EP0305366A1 (en) | 1987-03-11 | 1987-03-11 | Arrangement for drying a running web |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0305366A1 (en) |
| WO (1) | WO1988007103A1 (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2236584A (en) * | 1989-10-05 | 1991-04-10 | Spooner Ind Ltd | Air-float web treatment apparatus |
| FR2710971B1 (en) * | 1993-10-06 | 1995-12-29 | Infra Rouge System | Non-contact deflection device for sheet material. |
| FR2744387B1 (en) * | 1996-02-01 | 1998-04-17 | Rufo Donato | PROCESS AND DEVICE FOR THE CONTINUOUS MANUFACTURE OF SHEETS OF COMPACT MULTILAYER CARTON |
| SE509439C2 (en) * | 1997-05-13 | 1999-01-25 | Flaekt Ab | Device for drying or heat treating a material web |
| FR2775065B1 (en) * | 1998-02-19 | 2000-05-26 | Infra Rouge System | DEVICE FOR THE HEAT TREATMENT OF CONTINUOUSLY MOVING SHEET MATERIALS |
| US6049995A (en) * | 1999-04-20 | 2000-04-18 | Megtec Systems, Inc. | Infrared dryer with air purge shutter |
| DE20112396U1 (en) * | 2001-07-27 | 2001-11-15 | Ackermann Gunther | Irradiation device with drain nozzle |
| US8765167B2 (en) | 2001-10-12 | 2014-07-01 | Monosol Rx, Llc | Uniform films for rapid-dissolve dosage form incorporating anti-tacking compositions |
| US10285910B2 (en) | 2001-10-12 | 2019-05-14 | Aquestive Therapeutics, Inc. | Sublingual and buccal film compositions |
| US8603514B2 (en) | 2002-04-11 | 2013-12-10 | Monosol Rx, Llc | Uniform films for rapid dissolve dosage form incorporating taste-masking compositions |
| US20190328679A1 (en) | 2001-10-12 | 2019-10-31 | Aquestive Therapeutics, Inc. | Uniform films for rapid-dissolve dosage form incorporating anti-tacking compositions |
| US7357891B2 (en) | 2001-10-12 | 2008-04-15 | Monosol Rx, Llc | Process for making an ingestible film |
| US11207805B2 (en) | 2001-10-12 | 2021-12-28 | Aquestive Therapeutics, Inc. | Process for manufacturing a resulting pharmaceutical film |
| US20110033542A1 (en) | 2009-08-07 | 2011-02-10 | Monosol Rx, Llc | Sublingual and buccal film compositions |
| US7966743B2 (en) | 2007-07-31 | 2011-06-28 | Eastman Kodak Company | Micro-structured drying for inkjet printers |
| US9149959B2 (en) | 2010-10-22 | 2015-10-06 | Monosol Rx, Llc | Manufacturing of small film strips |
| US8398223B2 (en) | 2011-03-31 | 2013-03-19 | Eastman Kodak Company | Inkjet printing process |
| US8465578B2 (en) | 2011-03-31 | 2013-06-18 | Eastman Kodak Company | Inkjet printing ink set |
| JP5932356B2 (en) * | 2012-01-23 | 2016-06-08 | 日本碍子株式会社 | How to use the drying oven |
| US9427975B2 (en) | 2014-06-12 | 2016-08-30 | Eastman Kodak Company | Aqueous ink durability deposited on substrate |
| US11273131B2 (en) | 2016-05-05 | 2022-03-15 | Aquestive Therapeutics, Inc. | Pharmaceutical compositions with enhanced permeation |
| WO2017192921A1 (en) | 2016-05-05 | 2017-11-09 | Monosol Rx, Llc | Enhanced delivery epinephrine compositions |
| CN108049232A (en) * | 2018-01-09 | 2018-05-18 | 张斐斐 | A kind of drying equipment for paper making equipment |
| WO2022049470A1 (en) * | 2020-09-02 | 2022-03-10 | 3M Innovative Properties Company | Heated air nozzle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3499232A (en) * | 1967-11-13 | 1970-03-10 | Eduard J Zimmermann | Dryer having removable heating units |
| DE2841371B1 (en) * | 1978-09-22 | 1980-02-14 | Siemens Ag | Device for guiding a web, in particular a paper web |
| SE429770B (en) * | 1978-12-06 | 1983-09-26 | Flaekt Ab | DEVICE FOR DRYING OF COATED MATERIAL |
| US4494316A (en) * | 1983-03-14 | 1985-01-22 | Impact Systems, Inc. | Apparatus for drying a moving web |
| US4594795A (en) * | 1984-10-23 | 1986-06-17 | Erik Stephansen | Air bearing support apparatus for drying a moving web |
-
1987
- 1987-03-11 WO PCT/FI1987/000031 patent/WO1988007103A1/en not_active Application Discontinuation
- 1987-03-11 EP EP19870902088 patent/EP0305366A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8807103A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1988007103A1 (en) | 1988-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19881029 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE FR GB IT SE |
|
| 17Q | First examination report despatched |
Effective date: 19901024 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19910304 |