US3751823A - Drying apparatus - Google Patents

Drying apparatus Download PDF

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Publication number
US3751823A
US3751823A US00205505A US3751823DA US3751823A US 3751823 A US3751823 A US 3751823A US 00205505 A US00205505 A US 00205505A US 3751823D A US3751823D A US 3751823DA US 3751823 A US3751823 A US 3751823A
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US
United States
Prior art keywords
drying
air
strip material
cage
rolls
Prior art date
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Expired - Lifetime
Application number
US00205505A
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English (en)
Inventor
F Hansen
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Multitec AG
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Multitec AG
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Publication date
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Publication of US3751823A publication Critical patent/US3751823A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B96/00—Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E04B2/74—Removable non-load-bearing partitions; Partitions with a free upper edge
    • E04B2/7407—Removable non-load-bearing partitions; Partitions with a free upper edge assembled using frames with infill panels or coverings only; made-up of panels and a support structure incorporating posts

Definitions

  • the invention concerns drying apparatus suitable for drying strip material, which comprises a drying chamher through which strip material may be passed, a strip [30] Applisafion pfiority Data entrance and exit aperture in the chamber to allow pas- Dec. 9, 1970 Switzerland 18226 sage of strip material into and out of the drying cham her, a plurality of rotatable support rolls being disposed [52] US. Cl. 34/155, 34/160 in parallel and Spaced apart relationship to define a [51] Int. Cl.
  • a coating means has been arranged together with a system of rolls for directing the strip from one drying chamber to the other.
  • the strip material passes under a first coating means wherein a coating is applied to one side thereof and thence through a first drying chamber having rolls arranged as hereinbefore described.
  • the strip material then passes to a system of rolls wherein it is directed to a second coating means wherein a coating is applied to the other side of the strip and thence to a second such drying chamber.
  • Another known form of coating and drying apparatus has many drying chambers arranged lying in a plane, coating means being provided ahead of each drying chamber.
  • the drying chambers in such an apparatus comprise a series of rolls, the axes thereof being arranged in a plane.
  • both of the aforementioned known drying apparatus exhibit a further disadvantage when employing hot air-jet heaters. It is a requirement in drying strip material by means of hot air-jet heaters that the air jet flow and also that the resulting part-saturated air flow be evenly distributed over the surface of the strip.
  • One general method of satisfying this requirement is by employing a partially sealed air circulation system whereby some of the part-saturated exhaust air is discharged to the atmosphere and the system is replenished with fresh air, the mixture being heated up in a heater and led to the nozzles of the hot air jet drier. It is established technically that to obtain an absolutely even flow pattern in flat or circular chambers of rectangular cross-section such that no air congestion, resulting in zeroflow, occurs, is extremely difficult.
  • the present invention provides a drying apparatus suitable for drying coated strip material, which comprises a. a drying chamber through which strip material may be passed,
  • drying means for drying strip material passing over the rolls of the cage.
  • the drying means is a hot air-jet drier comprising a plurality of nozzles arranged in a cylindrical surface within the drying chamber radially outwardly of the cage and directed radially inwardly, an air outlet pipe extending from the drying chamber, an air inlet pipe for conducting hot air to the nozzles, an air heater for heating the air before passage thereof through the air inlet pipe, an air pump for pumping air to the air heater, and an air connecting pipe through which air may pass from the pump to the heater.
  • the air outlet pipe may be connected to the pump such that some at least of the air passing from the drying chamber through the outlet pipe is recycled through the inlet pipe.
  • the nozzle comprise slits extending axially in the radially inner surface of a hollow cylindrical jacket, the air inlet pipe communicating with the jacket.
  • the drying apparatus of the invention may be employed in conjunction with any known coating means, e.g. a coating roll and an air brush with the associated counter roll.
  • the cylindrical arrangement of the supporting rolls allows the advantage of a circular strip material path through the drying apparatus and over the support rolls,allowing on the one hand extremely satisfactory support of the strip material on the support rolls, whereby the dangers of distortion and longitudinal curling and folding are much reduced, and on the other hand much reduced ground space, e.g. in an apparatus enabling one or two coats to be applied and dried, the length of the apparatus as compared to the length of known apparatus of similar capacity is reduced to as much as one third of that length.
  • the strip material is led into and passes out of the same aperature in the drying chamber.
  • the arrangement of the nozzles to be directed radially inwardly overcomes or substantially reduces the hereinbefore disadvantages of air congestion and zones of zero air flow, the hot air being supplied and distributed over the whole periphery of the strip and flowing evenly against the strip.
  • Drying and coating apparatus may incorporate any number of units of drying apparatus constructed in ac cordance with the present invention. Generally, three such units are found to be convenient wherein eight variations with respect to the number and sequence of coatings is possible. Naturally, the number of drying apparatus units employed will depend on the particular requirements and may be either increased or decreased as circumstance demands.
  • drying apparatus of the present invention is provided with its own air circulation and heating system, this has the advantage that in a coating and drying apparatus embodying more than one heating unit, individual heating temperatures can be set by thermostatic regulation allowing the inlet and outlet air temperatures to be controlled automatically.
  • FIG. 1 is a schematic, part-sectional view of a drying apparatus of the preferred embodiment
  • FIG. 2 is a schematic sectional view along the line A-A of FIG. 1, and
  • FIGS. 3 to 10 are diagrammatic views of various coating and drying apparatus incorporating at least one of the drying apparatus of the preferred embodiment.
  • the drying apparatus of the preferred embodiment shown in detail in FIGS. 1 and 2 comprises a drying chamber 4.
  • a series of support rolls 3 disposed in parallel and spaced apart relationship to define a cylindrical cage, shown more clearly in FIG. 2.
  • Radially outwardly of the cage, and embodying part of the wall of the drying chamber is a hollow cylindrical jacket 7 provided on the radially inner wall thereof with a plurality of slits 5 extending axially across virtually the length of the wall, these slits constituting hot air-jet nozzles and being directed radially inwardly.
  • An aperture, in the form of a slot, in the drying chamber 4 and jacket 7 allows communication of the roll cage with the exterior to permit passage of strip material 2 into and out of the chamber.
  • FIG. 2 A nip roll 20 cooperating with the terminal roll of the roll cage adjacent the slot serves to enable the strip material to be supported over substantially the whole length thereof by the roll cage.
  • an air outlet pipe 8 which projects a part way into the chamber 4, and runs from the chamber 4 to a pump 10.
  • the end 9 of the outlet pipe 8 may be disconnected from the pump 10.
  • the pump 10 is connected to an air heater 12 by means of a connecting pipe 11.
  • Running off the connecting pipe 11 is a discharge duct 14 provided with a butterfly valve 15.
  • the air heater is connected to the jacket 7 by means of an air inlet pipe 13 which is connected to the chamber 4 at junction 6.
  • an air inlet aperture 16 In one end face of the chamber 4, opposite the mouth of the outlet pipe 8 and lying along the axis of the roll cage is an air inlet aperture 16 provided with valve means in the form of a grid of parallel shutters of adjustable inclination.
  • Freshly coated strip material 2 is led into the drying chamber through the slot therein, around the roll cage between nip roll 20 and the terminal roll of the roll cage and out again through the slot in the drying chamber.
  • I-Iot air is fed to the jacket 7 through inlet pipe 13 from heater 12.
  • the hot air is distributed generally evenly around the jacket 7 and is then forced through the slits 5 to impinge on the continuously moving length of strip material 2.
  • Partially saturated air travels generally radially inwardly of the chamber 4 and the vortex so formed around the projecting mouth of the outlet pipe 8 is sucked out through the outlet pipe 8 to the pump.
  • Some of this same air passes from the pump through the connecting pipe 11 to the heater 12 to be once more cycled through the system. However, a certain proportion of this air is discharged through the discharged duct M into the atmosphere.
  • the amount of air discharged in this manner may be controlled by adjustment of the butterfly 15.
  • Pressure in the drying chamber may be restored by admittance of air through the air inlet aperture 16, and a balance may be achieved by adjustment of the shutter inclination thereof. It will be appreciated that a condition of balance may be achieved with relative ease whereby all air discharged through discharge duct 14 is replenished by air entering through the shutter grid of the air inlet aperture 16. In this condition, substantially no air is lost through the strip inlet and outlet slot in the drying chamber such that all air flow is generally evenly distributed radially inwardly of the chamber.
  • the above described air circulation system has the advantage that by suitable adjustment of the shuttersof aperture 16 and butterfly 15, such that no net flow of air takes place through the strip material inlet and outlet slot in the drying chamber, the aerodynamic flow pattern within the drying chamber is substantially symmetrical and even.
  • the above described air circulation and drying system is applicable to the drying of water-based coatings.
  • the end 9 of the air outlet pipe is sealed to prevent air outlet, and the inlet to the pump is opened to the atmosphere.
  • the butterfly 15 is closed and the shutters of aperature l6 opened.
  • the aperture 16 is connected to a condenser (not shown). In use,air from the atmosphere is passed into the drying chamber via inlet pipe 13 and part saturated air passes out of the chamber through aperture 16 wherein, when a condenser is fitted, solvent may be removed from the outgoing air.
  • nip roll a is required, operating in an analogous manner to nip roll 20 hereinbefore described.
  • Strip take off reels 18 are arranged to allow strip material 2 to be fed to a coating means 17 and via a drying apparatus to a take up reel 19. More than one coating means 17 and drying apparatus units may be employed.
  • FIGS. 9 and 10 illustrated the manner in which a system comprising three drying apparatus units may be arranged to coat and dry coatings and the coating possibilities of such an apparatus.
  • FIGS. 3 and 4 show a path of strip material suitable for applying and drying a coating on one side only of the strip material
  • FIG. 5 shows a path of strip material suitable for applying and drying two coatings on one side only of the strip material
  • FIG. 7 shows a path of strip material suitable for applying and drying three coatings on one side only of the strip material
  • FIG. 6 shows a path of strip material suitable for applying and drying one coating on each side of the strip material
  • FIGS. d, 9 and 10 show a path of strip material suitable for applying and drying two coatings on one side and one coating on the other side of the strip material.
  • Drying apparatus suitable for drying coated strip material which comprises a. a drying chamber through which strip material may be passed,
  • a series of support rolls being disposed in parallel and spaced apart relationship to define a cylindrical cage within the chamber and over the rolls of which strip material may be passed,
  • hot air jet drying means for drying strip material passing over the rolls of the cage comprising a plurality of nozzles arranged in a cylindrical surface within the drying chamber radially outwardly of the cage and directed radially inwardly, an air outlet pipe having one end extending from the drying chamber and its other end extending into'the drying chamber part way along the cylindrical axis of the cage, an air inlet pipe for conducting hot air to the nozzles, an air heater for heating the air before passage thereof through the air inlet pipe, an air pump for pumping air to the air heater and an air connecting pipe through which air may pass from the pump to the heater.
  • the means cooperating with the rolls of the cage comprises a nip roll cooperating with the terminal roll adjacent the means defining an aperture in the drying chamber and around which nip roll strip material may be directed to pass out of the chamber.
  • drying means includes an air discharge pipe extending from said connecting pipe through which some of the air received from the pump may be discharged to the atmosphere and means defining an air inlet aperture in the drying chamber disposed substantially opposite the mouth of the air outlet pipe within the chamber and along the axis thereof.
  • valve means in the discharge duct is an adjustable butterfly valve.
  • valve means in the means defining an air inlet aperture comprises a grid of parallel shutters of adjustable inclination.
  • Coating and drying apparatus comprising the drying apparatus of claim 1 in combination with at least one coating means.
  • Drying apparatus suitable for drying coated strip material comprising:
  • an aperture in the drying chamber defining a common entrance and exit for said strip material to allow passage of said strip material into and out of said drying chamber;
  • a series of support rolls being disposed in parallel and spaced apart relation to define a cylindrical cage within said drying chamber and over the rolls of which said strip material may be passed;
  • drying means for drying said strip material passing over the rolls of said cylindrical cage comprising a plurality of hot air nozzles arranged in a cylindrical pattern within said drying chamber radially outwardly of said cylindrical cage and being directed radially inwardly; an air outlet pipe from said drying chamber; and means for conducting hot air to said nozzles.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Rod-Shaped Construction Members (AREA)
US00205505A 1970-12-09 1971-12-07 Drying apparatus Expired - Lifetime US3751823A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1822670 1970-12-09

Publications (1)

Publication Number Publication Date
US3751823A true US3751823A (en) 1973-08-14

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US00205505A Expired - Lifetime US3751823A (en) 1970-12-09 1971-12-07 Drying apparatus

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US (1) US3751823A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA950189A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH545659A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE2101787A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2117468A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IT (1) IT945360B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL7116882A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19841768A1 (de) * 1998-09-11 2000-03-16 Voith Sulzer Papiertech Patent Trockenpartie
US20070125876A1 (en) * 2005-07-28 2007-06-07 Ralf Bolling Nozzle system for the treatment of web-shaped material

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2802184C3 (de) * 1978-01-19 1981-09-10 Agfa-Gevaert Ag, 5090 Leverkusen Verfahren zur versuchsweisen Beschichtung von Papier- oder Folienbahnschlaufen mit viskosen Flüssigkeiten
ATE39789T1 (de) * 1983-06-27 1989-01-15 Voltaix Inc Ueberzuege fuer elektrochemische elektroden und verfahren zur herstellung derselben.
US4817538A (en) * 1984-05-30 1989-04-04 Bang & Olufsen Of America, Inc. Construction system for shelves
CN114938885A (zh) * 2022-05-11 2022-08-26 南阳农业职业学院 一种艺术设计专业多媒体讲台

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US44402A (en) * 1864-09-27 Improvement in machine for drying flannel and other cloths
US703044A (en) * 1901-10-02 1902-06-24 Charles H Crowell Drier for paper, cloth, &c.
US772694A (en) * 1904-02-15 1904-10-18 Brown & Bailey Company Paper box.
US2624573A (en) * 1949-06-29 1953-01-06 Rice Ernest Granville Web handling mechanism
US3638330A (en) * 1970-05-08 1972-02-01 Web Press Eng Inc Web support nozzles for drier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US44402A (en) * 1864-09-27 Improvement in machine for drying flannel and other cloths
US703044A (en) * 1901-10-02 1902-06-24 Charles H Crowell Drier for paper, cloth, &c.
US772694A (en) * 1904-02-15 1904-10-18 Brown & Bailey Company Paper box.
US2624573A (en) * 1949-06-29 1953-01-06 Rice Ernest Granville Web handling mechanism
US3638330A (en) * 1970-05-08 1972-02-01 Web Press Eng Inc Web support nozzles for drier

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19841768A1 (de) * 1998-09-11 2000-03-16 Voith Sulzer Papiertech Patent Trockenpartie
US6294050B1 (en) 1998-09-11 2001-09-25 Voith Sulzer Papiertechnik Patent Gmbh Drying end of a machine for the production of a material web and method of drying a material web
US20070125876A1 (en) * 2005-07-28 2007-06-07 Ralf Bolling Nozzle system for the treatment of web-shaped material

Also Published As

Publication number Publication date
NL7116882A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-06-13
FR2117468A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1972-07-21
CA950189A (en) 1974-07-02
IT945360B (it) 1973-05-10
DE2155386A1 (de) 1972-06-29
DE2101787A1 (de) 1972-06-22
CH545659A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-02-15

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