US3510960A - Vertical drying machine - Google Patents

Vertical drying machine Download PDF

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Publication number
US3510960A
US3510960A US735087A US3510960DA US3510960A US 3510960 A US3510960 A US 3510960A US 735087 A US735087 A US 735087A US 3510960D A US3510960D A US 3510960DA US 3510960 A US3510960 A US 3510960A
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United States
Prior art keywords
air
strip
chamber
drying
drying chamber
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Expired - Lifetime
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US735087A
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English (en)
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Hisayoshi Kubodera
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Individual
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Individual
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    • 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
    • F26B13/005—Seals, locks, e.g. gas barriers for web drying enclosures

Definitions

  • a vertical drying chamber containing a heating device is vertically passed through by a strip material to be dried.
  • the strip runs along an inverted U-shaped path in the chamber over a strip guide roller located at. the top of the drying chamber.
  • transverse air curtain creating nozzles which direct air onto the surface of the runs or spans of the strip and prevent heat transfer and leak of fluid from the chamber to the rollers.
  • This invention relates to drying machines and, more particularly, to a drying machine of the vertical type having a drying chamber or tower through which a material to be dried is passed.
  • the vertical drying chamber has at the upper portion thereof a horizontal guide roller, and a strip material to be dried is continuously passed through the drying chamber in an inverted U-shaped path with the uppermost part of the U-shaped material passing over the guide roller.
  • the material to be dried may, for example, be one wvhich has been passed through a bath of a treating medium dissolved in a solvent.
  • the upper part of the drying chamber tends to be excessively heated by the heat generated in the chamber, and a heated mixture of air and solvent in the chamber tend to leak through the upper part of the drying chamber.
  • These tendencies usually result in adhesion or sticking onto the guide roller of the treating medium applied on the strip material, and this often leads to damage to the material being treated.
  • the feed speed of the material to be subjected to drying operation is usually limited in the conventional machines by the sticking of the material to the guide roller at high speeds due to temperature rise in the guide roller.
  • Another problem in the maintenance of the machine is that, when the cap covering the guide roller is removed, leakage of the air and solvent occurs in great quantity from the drying chamber.
  • a main object of this invention is to provide a novel drying machine of the vertical type which is free of the above mentioned disadvantages.
  • Another object of this invention is to provide a novel drying machine wherein heat transfer from inside the drying chamber to the guide roller above the chamber and leakage of air and solvent from the drying chamber top are prevented.
  • each of the air curtain creating means includes air ejector nozzles so arranged that the upwardly and downwardly extending spans of the strip-like material running along the inverted U- shaped path are passed between opposing nozzles which direct air toward both surfaces of each span to. create air curtains or air stream layers for preventing ascent or leakage of the hot air and solvent in the drying chamber along the spans of the material to the guide roller.
  • the space between the upper and lower sets of air curtain creating means receives the air ejected from the nozzles and serves to discharge the air to any desired place.
  • FIG. 1 is a diagrammatic vertical section of an embodiment of this invention.
  • FIG. 2 is an enlarged vertical section of a top assembly.
  • the drying machine comprises a vertical housing 10 defining a drying chamber, which is divided by a vertical partition wall 11 into a pair of sub-chambers 12 and 13 communicating with each other at their upper ends.
  • These subchambers 12 and 13 have therein heating means 14 which are arranged along the length of the sub-chambers and allow the strip S to be treated to pass therealong.
  • the heating means 14 may be in the form of a series of pipes through which steam flows.
  • the sub-chamber 12 is provided with an inlet opening 15 for the strip S at the lower end thereof, and the subchamber 13 is provided with an outlet opening 16 for the strip S at the lower end thereof.
  • top assembly 20 On the top of the housing 10, there is rigidly mounted a top assembly 20 having a removable cap 21.
  • the top assembly 20 carries a rotatable roller 22 over which the strip S passes.
  • the strip 6 to be treated is supplied from a supply source (not shown) into a bath B of an appropriate treating medium which may, for example, be a coating material dissolved in a solvent.
  • the strip which has been coated with the material of the bath B is fed through the inlet opening 15 into the sub-chamber 12 to be heated or dried by the heating means 14 and then passes over the roller 22 to be fed into the other sub-chamber 13.
  • the strip is additionally subjected to heating or drying treatment when it passes through the sub-chamber 13, and is taken out from the chamber through the outlet opening 16.
  • the lowermost part of the subchamber 12 is communicatively connected to a cooling unit 30 through a conduit 31.
  • the cooling unit 30 includes therein a cooling means 32 which may be a series of pipes through which cooling medium flows.
  • the unit 30 is provided with a condensate collecting means 33.
  • the cooling unit 30 is communicatively connected through a conduit 35 to an air preheater unit 40 having therein heating means 41 which may, for example, be a series of pipes through which steam flows.
  • the air preheater unit 40 is connected through a conduit 42 with the lowermost part of the sub-chamber 13.
  • One of the conduits 31, 35 and 42 may be provided therein with a fan 34 for forced circulation.
  • the vertical type drying machine as described above is known per se and operates as follows.
  • the strip S As the strip S, with the treating medium applied thereon in the bath B, is fed into the drying chamber 12 and 13, it is subjected to heat generated from the heating means 14 with the resultant evaporation of the solvent from the surfaces of the strip. This evaporation causes the strip to be dried.
  • the evaporated solvent in the drying chamber is drawn by the fan 34 through the conduit 31 into the cooling unit 30 and is condensed on the cooling means 32, thus flowing down to the condensate collecting means 33 to be taken out therefrom.
  • the fan 34 also draws heated air in the drying chamber.
  • the air is cooled by the cooling means 32 and fed through the conduit 35 into the air preheater unit 40 to be preheated thereby.
  • the preheated air from the unit 40 flows into the sub-chamber 13 and passes upwardly along the strip being fed in counter-current flow relative to the latter to be again drawn to the fan 34 through the sub-chamber 12.
  • the air promotes the evaporation of the solvent on the surfaces of the strip passing through the drying chamber.
  • the top assembly includes a housing 50' in which are contained two sets of air-curtain devices.
  • the first or upper set of air-curtain devices comprises a pair of nozzle mounting members 51a and 51b rigidly secured on the inner wall of the housing 50 and a central nozzle mounting member 510 rigidly secured to the housing 50.
  • These mounting members 51a, 51b and 51c extend in parallel spaced apart relationship to each other and carry air ejection nozzles.
  • the mounting members 51a and 51b rigidly carry air nozzles 52a and 52b, and the central mounting member 510 rigidly carries on both sides air nozzles 520.
  • the opposing pairs of nozzles 52a, 52c and 52b, 52c respectively form gaps therebetween through which the upward and downward spans of the strip pass.
  • the pair of nozzles 52a and 520 are on the same horizontal level and eject air streams toward each other onto the adjacent surfaces of the running strip, thus forming a kind of air curtain extending transversely to the running direction of the strip.
  • the relation between the other pair of nozzles 52b and 520 are identical with that between nozzles 52a and 52c, the upwardly run traveling span of the strip passing between the nozzles 52b and 520.
  • the second or lower set of air-curtain devices is identical with the first or upper set and therefore will not be explained in detail.
  • the upper set of air-curtain devices is disposed between horizontal plates 55 and 56 having openings for the spans of the strips, and the lower set of air-curtain devices is disposed between horizontal plates 57 and 58.
  • an intermediate space 60 which is in communication with the internal spaces of both the upper and lower sets of air-curtain devices.
  • the space 60 is connected with an air discharge conduit 61 having a control valve 62.
  • a space 66 below the lower set of air-curtain devices is in communication with the drying chamber through openings 63 allowing the passage of the spans of the strip and also in communication with the internal space of the lower set of air-curtain devices.
  • the space 66 is con- 4 nected With a discharge conduit 64 having a control valve 65.
  • the hottest air in the drying chambers 12 and 13 gathers in the uppermost part thereof.
  • Such air may, if desired, be exhausted to the outside remote from the machine through the conduit or chimney 64, and the exhaust may be stopped by closing the valve 65.
  • a small part of the mixture of the air and solvent fiows into the space 60 with the injected air of the nozzles. This part of the mixture is further resisted by the air curtains or air streams created in the upper set of the air curtain devices and cannot ascend furthermore.
  • the hot mixture of air and solvent can in no way fiow along the running strip into the internal space directly below the removable cap 21.
  • the small part of the mixture which flows into the space 60 may be exhausted through the conduit or chimney 61 to a place remote from the machine.
  • an air ejection device 70 which directs cool air onto the surface of the strip passing through the space.
  • the prevention of leakage of the mixture of air and solvent from the drying chamber will be more effective because the air ejected from the device 70 flows into the space 60 so as to further restrain the leakage of the mixture toward the roller 22.
  • the rate of exhaust through the conduit or chimney '61 can be appropriately adjusted by the control valve 62. When the valve 62 is set to a position in which the amount of air exhausted from the top assembly 20 is equal to that introduced into the assembly, the optimum condition is obtained.
  • Such a condition can also be attained by connecting the conduit 61 to the conduit 64 so as to form a closed circuit for the air.
  • This procedure is advantageous because the closed circuit of air flow shuts out outside dust and prevents clogging of the air-curtain nozzles and because the closed circuit makes it possible to cool the air exhausted from the conduit 61 before it is again supplied to the conduit 64, for the purpose of maintaining constant operating condition.
  • this procedure has the drawback of requiring removal of the solvent intermixed with the exhaust air before the air is again returned to the conduit 64.
  • the air-curtain devices associated with the downward traveling span eject heated air to warm the span and that those associated with the upward traveling span eject cooled air to cool the run.
  • the lower set of the air-curtain devices supplies appropriately heated air to prevent condensation of the solvent in the drying chamber onto the air-curtain nozzles exposed to the chamber and to prevent condensed solvent on the nozzles from being splashed onto the strip by the ejection force of the air.
  • the air ejected from the lower set of air curtain devices is supplied into the intermediate space 60.
  • the air may be supplied into the lower space 62 so as to be exhausted through the conduit 64.
  • the nozzles be located as close as possible to the surfaces of the strip. However, it is important that the nozzles do not contact the strip.
  • control valve 65 When it is necessary to remove the cap 21, the control valve 65 is fully opened to direct the ejected air from the lower set of air curtain devices into the chamber 63. This effectively prevents the mixtures in the drying chamber from leaking in the upward direction.
  • a drying machine including a vertical drying chamber, a guide roller for a strip material to be treated provided at the top of said chamber, and means for passing the strip material through the interior of said chamber along an inverted U-shaped path passing over said guide roller, said material within the chamber assuming an inverted U by configuration with upwardly and downwardly traveling spans, the combination therewith of at least two vertically spaced sets of air curtain creating means positioned below said roller and above the top end of said drying chamber, each of said air curtain creating means including air ejector nozzle means so arranged that the lit) upwardly and downwardly traveling spans of the material are passed between the nozzles, which direct air toward both surfaces of each span to create air curtains for preventing ascent of hot fluid in the drying chamber along the spans of the material to said guide roller, the space between said sets of air curtain creating means serving to exhaust the air ejected from the nozzle of both sets.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
US735087A 1967-06-10 1968-06-06 Vertical drying machine Expired - Lifetime US3510960A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3676667 1967-06-10

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US3510960A true US3510960A (en) 1970-05-12

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Application Number Title Priority Date Filing Date
US735087A Expired - Lifetime US3510960A (en) 1967-06-10 1968-06-06 Vertical drying machine

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US (1) US3510960A (de)
DE (1) DE1778826A1 (de)
GB (1) GB1234956A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703773A (en) * 1970-04-09 1972-11-28 Burlington Industries Inc Gas phase reactor
US3800433A (en) * 1972-05-04 1974-04-02 H Kubodera Drying and curing apparatus
US4793074A (en) * 1988-01-07 1988-12-27 Eastman Kodak Company Dryer assembly for photographic paper
MD442C2 (ro) * 1984-04-02 1996-06-30 Sinter Limited Procedeu de uscare a pânzei materialului, impregnat cu răşină termoreactivă sintetică ,şi dispozitiv pentru efectuarea acestuia

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2857734B1 (fr) * 2003-07-16 2005-09-02 Stein Heurtey Procede et dispositif de sechage d'un revetement non metallique sur une bande d'acier
FR2958563A3 (fr) 2010-04-13 2011-10-14 Fives Stein Procede et dispositif de revetement de bandes metalliques.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532471A (en) * 1947-04-10 1950-12-05 American Viscose Corp Spray application of dyestuff and other materials
US2621504A (en) * 1946-09-04 1952-12-16 Spooner William Wycliffe Apparatus for steaming webs
US3222895A (en) * 1961-12-01 1965-12-14 Monsanto Co Apparatus for treatment of napped fabric
US3396415A (en) * 1963-10-14 1968-08-13 Christian August Meier Windhorst Process for the continuous heat treatment of lengths of textiles and the like

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621504A (en) * 1946-09-04 1952-12-16 Spooner William Wycliffe Apparatus for steaming webs
US2532471A (en) * 1947-04-10 1950-12-05 American Viscose Corp Spray application of dyestuff and other materials
US3222895A (en) * 1961-12-01 1965-12-14 Monsanto Co Apparatus for treatment of napped fabric
US3396415A (en) * 1963-10-14 1968-08-13 Christian August Meier Windhorst Process for the continuous heat treatment of lengths of textiles and the like

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703773A (en) * 1970-04-09 1972-11-28 Burlington Industries Inc Gas phase reactor
US3800433A (en) * 1972-05-04 1974-04-02 H Kubodera Drying and curing apparatus
MD442C2 (ro) * 1984-04-02 1996-06-30 Sinter Limited Procedeu de uscare a pânzei materialului, impregnat cu răşină termoreactivă sintetică ,şi dispozitiv pentru efectuarea acestuia
US4793074A (en) * 1988-01-07 1988-12-27 Eastman Kodak Company Dryer assembly for photographic paper

Also Published As

Publication number Publication date
GB1234956A (en) 1971-06-09
DE1778826A1 (de) 1971-08-05

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