US3176411A - Paper drying hood - Google Patents

Paper drying hood Download PDF

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Publication number
US3176411A
US3176411A US58265A US5826560A US3176411A US 3176411 A US3176411 A US 3176411A US 58265 A US58265 A US 58265A US 5826560 A US5826560 A US 5826560A US 3176411 A US3176411 A US 3176411A
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Prior art keywords
drying
cylinder
manifold
web
pressure chambers
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US58265A
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English (en)
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Jepson Michael Denis
Underhay George Flaxman
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Bowaters Development and Research Ltd
Bowater Research and Development Co Ltd
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Bowater Research and Development Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
    • B65G39/02—Adaptations of individual rollers and supports therefor
    • B65G39/04—Adaptations of individual rollers and supports therefor the rollers comprising a number of roller forming elements mounted on a single axle
    • 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
    • D21F5/02—Drying on cylinders

Definitions

  • the web in a papermaking process wherein the web is dried by entrainment around one or more heated drying cylinders and by directing gaseous drying medium directly on to the outer surface of the web about the drying cylinder in such manner that evaporation of moisture from the web surface and transference of heat from the drying cylinder are enhanced at drying zones arranged transversely of the web, individual control of the drying rate in each zone is achieved by adjustment of the velocity of the drying medium directed onto the web at that zone or the temperature of the drying medium so directed or the humidity of the drying medium so directed or any combination of two or all of such adjustments, the gaseous medium, after flowing over and away from the outer surface of the web being caused to flow transversely of the web and then to flow in a direction away from the surface of the cylinder.
  • the velocity of the gaseous medium flowing away from the outer surface of the web is preferably substantially lower than the velocity of the gaseous drying medium directed onto the outer surface 3,176,411 Patented Apr.
  • a drying hood for a drying cylinder of a paper-making machine comprises a plurality of pressure chambers disposed in side by side relationship transversely of the direction of paper travel, each pressure chamber having an arcuate face adapted to the periphery of the drying cylinder and containing nozzle orifices for the direction of gaseous drying medium onto a web of paper on the periphery of said drying cylinder, and means for supplying gaseous drying medium to said pressure chambers and for enabling the drying rate achieved by the drying medium directed from the nozzle orifices of each pressure chamber to be individually controlled, by adjustment of the humidity of the drying medium supplied to each pressure chamber, or the temperature of the drying medium supplied to each pressure chamber, or the rate of supply of drying medium to each pressure chamber, or any combination of two or all of such adjustments, and exhaust passageways spaced apart transversely of the direction of paper travel by which the gaseous medium after flowing over and away from the surface of the web can flow in a direction away from the periphery of the drying cylinder.
  • a drying hood for a drying cylinder of a drying section of a papermaking machine comprises a manifold, fan means for supplying gaseous medium to said manifold, heating means for heating the said gaseous medium, a plurality of pressure chambers disposed in side-by-side relationship transversely of the direction of paper travel, each pressure chamber communicating with said manifold for receiving heated gaseous medium therefrom and having an arcuate face adapted to the periphery of the drying cylinder and containing nozzle orifices for the direction of heated gaseous medium onto a web of paper on the periphery of said drying cylinder so as to hold the web in close non-adhesive contact with the cylinder, valve means for individually controlling the flow of gaseous medium from said manifold to each pressure chamber, and exhaust passageways spaced apart transversely of the direction of paper travel by which the gaseous medium after flowing over and away from the surface of the web can flow in a direction away from the peripher
  • the pressure chambers are spaced-apart and the spaces between them provide at least some of the exhaust passageways.
  • the manifold lies directly adjacent said pressure chambers and on the opposite side thereof to their arcuate faces and said valve means conveniently comprises shutters controlling ports in a wall between the manifold and the pressure chambers.
  • the invention is applicable to any type of drying section and can be used with machines employing a number of small cylinders, a single large cylinder such as is generally used for the production of glazed or creped paper, or a combination of both large and small cylinders.
  • a multi-cylinder drying section when the web is maintained in non-adhesive contact with the cylinders, the necessary pressure to maintain contact, and which, in conventional machines is produced by the dryer felts, is generated by the pressure of the gaseous medium directed onto the web or any longitudinal tension which may be applied to the web or both.
  • the drying hood has an outer casing for collecting spent gaseous medium flowing away from the periphery of the drying cylinder, the fan means communicating by its inlet side with the interior of said casing whereby to re-supply spent gaseous medium to said manifold.
  • the preferred drying medium is predominantly air, but it will be appreciated that in general a proportion of water vapour from the web is present and is beneath the exhaust openings.
  • the fan means comprises at least one axial flow fan driven by a motor which maybe situated outside the cas- V from'a common manifold 42.
  • the arcuate faces of the pressure chambers are contiguous and exhaust channels extendinglongitudinally of the drying cylinder but at the opposite side of the arcuate faces to the cylinder communicate with'the-exhaust passageways, said arcuate I faces having exhaust openings to permit thespent 3.11 to flow into the exhaust channels.
  • the total area of the exhaust openings is preferably-subst-antially greater than that of'the nozzle orifices so that the velocity of the air flowing away from the cylinder is substantially less than the velocity of the drying air d1- 7 be necessary thata positive :pressure be maintained' beneath the exhaust openings and even aslrght negative pressure may not, in certain circumstances, bGdlSfiKlVQIltageous.”
  • v V I Itis generally preferred however that'the lowestpressure of the gaseous medium under the'hood is sufficient" to avoidthe uncontrolled inflow of ,air at ambient condi-. tions from outside the hood under its bottom'edges.
  • FIG. 1 is a diagrammatic side elevation oflpart of-a.
  • FIG. 2 is a front elevation of the drying hood of FIG. 1;
  • FIGS is a cross section on the line III-III'of FIG. 2
  • section line III- 1H also being in dicated in FIG. 4;.
  • FIG. 4 is a section on, 7 section line IV-IV also being indicated in FIG. .5;
  • FIG. 5 is'a detailed section on the line V-V of FIG. 4;.
  • FIG. 6 is a detailed cross section on the line VI VI of FIG. 3 to a still larger scale, the section line VI VI also being indicated in FIG. 5; I I FIG. 7 is an enlarged detail of the section shown 1n FIG. 4 forcomparison with. FIG. 6; v
  • FIG. 8 is a section on the line ;VIII--VIII of FIG. 3,
  • T he drying hood 2% contains six pressure chambers 30,. 32, 34, 36,38 and deployed axially of the cylinder in the positions indicated by dotted lines in FIG. 2.
  • '- pressure chambers are individually supplied with gaseous drying medium, which'in the embodiment shown is air,
  • FIGS. 3 to 8 show the construction of the drying hood in more detail.
  • the pressure chambers 38 and 40 are spaced apart so that their longitudinal partition'walls 39 and 41 define an exhaust passageway 44 by which spent air can flow in adirection away from the surface of the cylinder 22.
  • Allthe other pressure chambers are likewise spaced apart: I
  • FIGS. 3 to 7 a series of flow passage means formed as channels 46 extend along the cylin-. der 22 ,behind'aperforated arcuate bottom wall' or face 48 of each pressurechamber, the arcuate faces substantially'conforming to the periphery of the cylinder in ra-' dially outwardly spaced'relation tothe latter; Drying air in thepressure chamber 38 :has access to nozzle orifices '54 in the form of holes arranged in the arcuate face 48 for the projection or air towards the webof paper on the sur-'- face of the cylinder 22.. This is indicated in FIGS. 3 and 6 by arrows 52. I I I Although the following description refers for the most part to the pressure chambers 38 and 40, it will be. appre,
  • . and 40 are of similar construction.
  • the arcuate faces of the pressure chambers are contiguous although the press surechamber walls 39 and 41 are spaced apart.
  • the chan- 1 nels 46 extend the full length ofthe contiguous arcuate "faces 48 but are open to the exhaust passageway44 at their facesopposite the arcuate faces 48, as can be seen in FIG. 7; 'The gaps betweenthefchannels provide access to. the'ndz-zle orifices for the airin the pressure chambers and are isolated from the exhaustpassageway 44by plates 7 3 4'7 1 as can be seen in FIGS. 5 and 6 Intercommunication between the'pressure chambers along the gaps between ,thechannels 46 is prevented by plates 54 (see FIG. 6).
  • FIG. 9 is a cross section similar to that shown inFIG.
  • FIG. 10 is a detail section on the line X-eXiof FIG. 9.
  • adrying hood 20 constructed accord ng to the present invention is disposed about anv upper cylinder 22 of faImulti-cylinder drying section of a paper makk 24 to be dried passes al-,
  • the drying hood'20 is provided with an outer casing. 60v having sidewalls 62 transverse to the direction of movement of the'web, end walls 64 longitudinal tothe direction of movement, ofythe' web and'a top 'wall66 j formed of heat insulating panelling (see FIGS. '3 and 4).
  • Two spaced inner walls 45a transverse to the direction of f ,t-raveliof the web, extend from'the'bottom wall 48 to the manifold 42, one at each side of the arcuate part of the bottom wall 48
  • Thetransverse walls 45a are spaced from ternately round cylinders in :an upper row a cylinders in alower row, those 1n thei'upperrow, other than the by 26 and those in.the lower cylinder 22, being indicated row by 28 in FIG. I.
  • a supply chamber 68 1 (FIG. 3) is formed between the manifold 42 and the top wall 66 of the casinggand main fans 70 are arranged between the supply chamber 68 and the manifold 42. Spentto the manifold 42 by the main fans 70, which are driven by motor 72. The spent air flowing into the supply chamber 68, passes through heaters 74 in the form of a plurality of finned steam pipes 76, supplied with steam th oughvinlets-78, and having steam outlets 80.
  • the mainfans 70 are axial flow fans having their inlets 82 disposed directly in the supply chamber 68 and their outlets 84, having a diffuser 86, directly within the manifold 42. This construction avoids the use of any ducting between the supply chamber and the manifold 42 and leads to a compact space-saving arrangement.
  • each of the pressure chambers is individually supplied with air from the manifold 42.
  • the top Wall 88 of each pressure chamber is intermediate each pressure chamber and a top inner wall 42a.
  • the top wall' 88 which forms the bottom wall of the manifold 42, is provided with ports 90 to permit the air to flow into the pressure chambers.
  • the ports 90 are controlled by shutters 92, each of which is individually slidable by means of a Bowden cable 94 to enable individual adjustment of the flow through the ports 90 to be made.
  • each of the ports 90 is cusp shaped and in particular comes to a point at one end to enable a fine control of the quantity of air flowing from the manifold 42 to each pressure chamber to be obtained.
  • the shutters are provided with runners 96 which run in channels 98, as can be seen in FIGS. 4 and 8.
  • drying air is circulated along a substantially enclosed endless path, which comprises the manifold 42, one of the pressure chambers, the nozzle orifices 50, the exhaust openings 56, the flow passage channels 46, one of the exhaust passageways and the supply chamber 68 whence it is re fed to the manifold 42 by the main fans 70.
  • exhaust ducts 100 In order to prevent the drying air so circulated becoming saturated with, water vapour, some of the air and evaporated water, so circulated is withdrawn through exhaust ducts 100 and fresh air is supplied through ducts 102 (see FIGS. 1 to 5).
  • exhaust ducts 100 there are two exhaust ducts 100 which, are joined into a single duct 101, within which, is disposed an exhaust fan 104, of the axial flow type, driven by amotor 106 (indicated diagrammatically in broken lines in FIG. 2).
  • the exhaust fan 104 withdraws spent air from within the casing. 60 and the spent air is discharged,for example, into a flue (not shown).
  • the quantity of spent air withdrawn is controlled by a damper 112.
  • the make-up air ducts 102 which are also two in number, are supplied, from a common duct 103, within which there, is disposed a fresh-air fan 108, also of the axial flow type, driven by a, motor 110 (indicated diagrammatically in broken lines in FIG. 1).
  • the fresh-air fan 1'08- draws fresh air in from the atmosphere through a filter 114. and supplies such fresh air to the supply chamber.
  • the quantity of fresh or make-up, air is controlled by adamper 116 (FIG. 2).
  • Cooling air for the motors 72 driving the main fans 70 is also supplied by the fresh-air fan 108.
  • ducts 118 leading-to the motors 72 are also connected to the common duct 103, as shown in FIG. 2. It can conveniently be arranged that cooling air after cooling the motors 72, flows through the fan centres and is discharged just before the fan rotor'blades of the main fans so as to mix with the drying air being circulated.
  • the make-up air can be heated, for example by steam or electrical heaters (not shown). If the make-up air is also used to cool the motors 72 as shown, then the temperature to which such air is heated is limited by the temperature rating of the motors 72. This temperature may, for example, be 160 F.
  • make-up air If it is desired to heat the make-up air to a higher temperature, then a separate supply of cooling air for the motors 72 is preferred. It is not essential that the make-up air be heated before supplying to the supply chamber; the make-up air can obtain heat by admixture with the air being circulatedthrough the heaters 74.
  • the rate of supply of drying air to each of the pressure chambers can be individually controlled, thereby enabling the drying rate at six zones contiguously arranged transversely of the web to be separately controlled.
  • The- Bowden cables 94 attached to the shutters 92 lead to a control panel 128 (FIG. 1) fitted with cranks or handles 130 for adjusting the shutters.
  • the control panel 128 also has further handles 132 operating Bowden cables 134, which control the dampers 112 and 116 in the exhaust air and makeup air ducts (FIG. 2).
  • the shutters are adjusted in order to obtain as even a moisture distribution, transversely of the finished web, as possible. Should the moisture profile transversely of the web vary during operation of the paper making machine, for example due to uneven wear of the calender or press rolls, then appropriate corrective action may betaken at the control panel 128.
  • the drying hood 20 is pivoted to a fnamework 120 situated at one end of the cylinder 22 and to a piston rod 122 of a pneumatic piston and cylinder mechanism 124 situated at the other end of the cylinder 22, as can be seen in FIGS. 1 and 2.
  • the upper end of the mechanism 124 is mounted on the framework 126.
  • the make-up air duct 103 is provided with a flexible portion 128 to avoid having to disconnect this duct when lifting the drying hood away from the surface of the cylinder.
  • drying cylinders 22, 26 and 28 are internally steamheated in the conventional manner, the means for this purpose being omitted from the drawings for the sake of clarity.
  • More than one of the cylinders of the upper row may be provided with drying hoods according to the present invention, if so desired. Where adjacent cylinders in the same row have such drying hoods then the supply chambers, possibly the manifold and possibly also the pressure chambers, as well as the outer casing, may be arranged to be common to said adjacent cylinders. Moreover, drying hoods according to the present invention may also be adapted to the drying cylinders of the lower row. In order to increase the drying capacityof the drying section, a large number of drying hoods may be used.
  • all the hoods be provided with shutters for individually controlling the drying rate transversely of the Web, but it is desirable that they be so provided so that a substantially uniform moisture profile may be obtained through as large a part of the drying section as possible.
  • a uniform moisture profile transversely of the web may be obtained substantially throughout the drying section. This reduces the risk of wrinkles developing in the web.
  • a drying hood according to the present invention can be fitted to an existing machine in order to improve the uniformity of the moisture content of the finished web and in order to increase the capacity of the drying section.
  • the "web can be dried to a substantially uniform wetness in keeping with thehurnidity
  • the total of the surrounding'atmosphere thus avoidingthe nec'es--f Y sure chambers, by means not shown.
  • the pressure chamhere may also be provided with thermometers, if desired.
  • the humidity of the drying air being circulated is controlled by the dampers 112 and 11s (FIG. 2), and samples of the spent air flowing through the exhaust duct 101 then-there-would be arisk of-the web being lifted from may bejtaken'for the purpose of assessing thelmoisture" content of the "drying air being circulated.
  • I 3 I
  • heat istransferred to theweb' on the drying cylinder 22 not only from the drying cylinder but also from the heated air directed onto the web. Morecrossasectional area of the exhaust openings is approximately twenty-eight times thetotal cross-sectional area of the nozzle orifices. ;Thus the velocity of the spent air flowing awayfrom the web 'through' the exhaust openings is very muchlower than the velocityofthe air flowing towards the web through the nozzle orifices. Moreover,
  • orifices of a drying hood creates a force acting on the outer surface of the web, thusQat least assisting in maintaining theweb in close'but non-adhesive contact with the cylinder. Where passageways, so that a slight positive pressure may be still maintained beneath the exhaust openings.
  • the perforated arcuate faces of the pressure chambers present a substantially smooth surface to the web abou'tthe drying cylinder so that should a break-occur in the web there is little risk of the broken web being caught up o'nthe drying hood and damaging the hood.
  • drying hoods in'gs. Princip'alparts which are like those of the ema paper-making machine-liasa drying section with an M.G. cylinder and one or more pro-drying cylindersa drying hood according to the present invention may be applied to some or all of the pro-drying cylinders. It'is envisaged further-more that drying hoods according to the present invention can be applied to, drying sections hav-' ing few, large diameter drying cylinders compared with. conventional multi-cylinder drying sections having a large numberof .small,.e.g. 5 ft.,diameter, drying cylinders.
  • the web is main;
  • FIGS. 9 and 10 differ from that of the previous embodimentfprin'cipally in i that the pressure chambers, of which 238 and 240 are seenin the drawings, instead of being spaced apart, adjoin one another.
  • Exhaust passageways 244, which extend circumferentially of the drying cylinder 22, are arranged within the pressure chambers themselves.
  • the arrows 258- indicatethepassage-of spent air-from thesurface of the web through the exhaustopenings 56, and
  • the spent air immediately after direction towards the surface of the web,'first flows only to a limited eX- tent circumferentially of the drying cylinder, then through the exhaust openings Sdinto the channels 46 and subsequently transversely'of. the web into the exhaust passageways 244 and 45, wherein'it'can how in a, direction away, from the surface of the-drying cylinder.
  • the manner in'which the 'spentair is led away from the surface of-the' rcylinder is therefore substantially thesarne as that in'the embodiment of FIGS. 1 to 8.
  • drying hood illustrated in FIGS. 1 and 2 of the drawings, access to the surface of the drying cylinder is obtained by pivoting the hood about one end. It may, however, be preferable, according to the design of the frame of the drying section to which the hood is applied, to arrange for the hood to be liftable vertically, for example by four hydraulic or pneumatic piston and cylinder mechanisms or screw jacks arranged at its corners.
  • the pneumatic piston and cylinder mechanism illustrated in FIGS. 1 and 2 may be replaced by a hydraulic piston and cylinder mechanism so desired.
  • the shutters controlling the ports between the common manifold and the individual pressure chambers are manually operable using Bowden cables.
  • the shutters could be operated by air or hydraulic cylinders or by screwed rods on each of which a nut is rotatable by "means of an air or electric motor.
  • the moisture profile transversely of the finished web may be controlled automatically.
  • moisture content sensing shoes corresponding in number and transverse positions to the numher and transverse positions of the pressure chambers
  • each of themoisture content sensing shoes may be connected electrically or otherwise so as to control the shutter associated with the corresponding pressure chamber.
  • a single I moisture content sensing shoe may be arranged to traweb in six groups of three, the groups being spaced from one another to provide five exhaust passageways between adjacent pressure chambers.
  • Such a structure is achieved by dividing each pressure chamber of the drying hood illustrated in FIGS. 1 to 8 into three, each one of which has its own shutter controlling the supply of heated air thereto from the common manifold.
  • the spent air should flow through the exhaust channels with a significant velocity, the consequent pressure drop in the exhaust channels being used to maintain a slight positive pressure beneath the exhaust openings in the arcuate faces of the pressure chambers. If too many exhaust passageways were provided they would be a comparatively short distance apart so that the air velocity in the exhaust channels, which would be correspondingly shorter, would be negligible, leading to a negligible pressure drop in the exhaust channels which could not be used to maintain a positive pressure beneath the exhaust openings. Moreover, the provision of a comparatively few exhaust passageways transverse of the Web when a large number of pressure chambers is employed leads to a simplification in construction.
  • pressures ranging from 4 ins. to 16 ins. water gauge (measured at 60 F.) in the manifolds of the illustrated embodiments of the invention.
  • the pressure in each of the pressure chambers may be varied from zero to 16 ins. water gauge.
  • a static positive pressure (with respect to atmosphere) of from 0.1 in to 1 in. water gauge (measured at 60 F.) is obtainable immediately beneath the exhaust openings in the perforated arcuate faces of the pressure chambers.
  • drying apparatus including a drying cylinder about which sheet material in continuous lengths to be dried is entrained, the combination comprising a plurality of pressure chambers deployed axially of the cylinder, said pressure chambers having axially aligned arcuate faces substantially conforming to the periphery of the cylinder in radially outwardly spaced relation thereto and having nozzle orifices for directing gaseous drying medium from the pressure chambers onto sheet material entrained about said cylinder; exhaust passageways circumferentially coextensive about said cylinder with said pressure chambers and spaced apart axially of said cylinder, each exhaust passageway being separated from the next thereto by at least one of said pressure chambers; means communicating through said arcuate faces for directing said gaseous medium axially of said cylinder to said exhaust passageways after said gaseous medium has flowed over and away from the surface of said sheet material; means for supply ing gaseous drying medium to said pressure chambers; and means for enabling the drying rate of the sheet material achieved by said gase
  • drying apparatus including a drying cylinder about which sheet material in continuous lengths to be dried is entrained, the combination comprising a plurality of pressure chambers deployed axially of the cylinder, said pressure chambers having axially aligned arcuate faces substantially conforming to the periphery of the cylinder in radially outwardly spaced relation thereto and having nozzle orifices for directing gaseous drying medium from the pressure chambers onto sheet material entrained about said cylinder; exhaust passageways circumferentially coextensive about said cylinder with said pressure chambers and spaced apart axially of said cylinder; flow passage means radially outwardly beyond said arcuate faces extending axially of said cylinder and comalt e 11 municating with said exhaust passagewayasaid flow' paS?
  • Drying apparatus comprising an enclosing casing having a bottom wall which-provides saidpressure chamber arcuate faces; an intermediate wall spaced from said bottom Wall; two spaced apart transk verse walls parallel to the cylinder'axis on opposite sides thereof and extending between said intermediate and bottom Walls, said intermediate 'wall dividing the casing in;
  • transverse walls, and said' inte'rmediate' wall, and a collecting space a plurality of sp'aced apart partitions inner transverse walls parallel'to the cylinder axis and onopposite sides thereof; an intermediate wall spaced irom said bottom wall and extending from oneof said transverse walls. tolthe other; a plurality of spaced apart partitions between said transverse walls extending parallel to thedirection of motion of sheet material entrained about said cylinder, said inner transverse walls, said bottom wall; said intermediatewall and said partitions defining-said pressure chambers andsaid exhaust passageways,
  • saidmeans for enabling the drying rate of the sheet ma- :te'rial to be independently controlled comprising separate independently operableinlet means between said manitold and the respective pressure chambers;
  • Drying apparatus in which f independently operable inlet tmeans comprises cusp respectively extending from one of said transverse walls to the other in the direction'ofrnotion ofsheet material entrained about said cylinder, said transverse walls, said bottom wall, said intermediate wall and said partitions defining said' pressure chambers and said exhaust passageways, one of saidtintermediate and transverse walls-having a pluralityof ports separately providing communica tion between said collecting space and the respective pressure chambers and at least one other of, said intermediate and transverse walls having gaps' providingv communication between said exhaust passageways and said collect ing space, said meansfor supplying gaseous drying me dium to said pressure chambers including a heater within said casing, and said means for enabling the drying rate of the sheet material to be controlled comprising means within said casing but operable from the exteriorthere'of for controlling the flow of drying medium from said collecting space through said ports individually to difierent x ones of said pressure chambers.
  • Drying apparatus comprising shaped ports in said intermediate wall between said manifoldand respective pressure chambers; movable shutters respeotivelyta'ssociated.with said ports; and means con- 2,012,115, 8/35 Woodrutf "34-23 2,837,830 6/58 'Fry 34* '114 X 1 2,919,495 1/60 Underhay 34l60 X 2,929,153 3/60 Fr 34' 114 X f ronnro'n PATENTS 727,058 3/55 Great Britain. 7 1 773,908 5/57 Great'Britain;

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
US58265A 1960-09-02 1960-09-26 Paper drying hood Expired - Lifetime US3176411A (en)

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GB30426/60A GB934757A (en) 1960-09-02 1960-09-02 Removing liquids from sheet material

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3242587A (en) * 1964-12-07 1966-03-29 Joseph H Dupasquier Apparatus for concentrating a blanket of dry steam for an extended area on a pulp mat
US20050160621A1 (en) * 2002-06-29 2005-07-28 Wilhelm Hartmann Circulating air dryer for material webs
US20070193060A1 (en) * 2004-03-02 2007-08-23 Nv Bekaert Sa Infrared drier installation for passing web
US20080256818A1 (en) * 2004-03-02 2008-10-23 Nv Bekaert Sa Drier Installation for Drying Web
US20080276488A1 (en) * 2007-05-07 2008-11-13 Paul Seidl Step air foil web stabilizer
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process

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Publication number Priority date Publication date Assignee Title
EP3224409B1 (de) * 2014-11-28 2021-08-18 Voith Patent GmbH Verfahren und vorrichtung zur herstellung von verpackungspapier

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Publication number Priority date Publication date Assignee Title
US2012115A (en) * 1932-02-17 1935-08-20 Oxford Paper Co Method of and apparatus for dyring a continuous web
GB727058A (en) * 1952-07-21 1955-03-30 William Charles Whittaker Improvements relating to drying cylinders of paper-making machines
GB773908A (en) * 1954-01-12 1957-05-01 Borje Valentin Leckner Paper-drying apparatus
US2837830A (en) * 1956-06-19 1958-06-10 American Viscose Corp Method and apparatus for drying flexible sheet material
US2919495A (en) * 1954-04-15 1960-01-05 Bowater Res & Dev Co Ltd Process of papermaking
US2929153A (en) * 1955-11-29 1960-03-22 American Viscose Corp Drying apparatus for sheet material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2012115A (en) * 1932-02-17 1935-08-20 Oxford Paper Co Method of and apparatus for dyring a continuous web
GB727058A (en) * 1952-07-21 1955-03-30 William Charles Whittaker Improvements relating to drying cylinders of paper-making machines
GB773908A (en) * 1954-01-12 1957-05-01 Borje Valentin Leckner Paper-drying apparatus
US2919495A (en) * 1954-04-15 1960-01-05 Bowater Res & Dev Co Ltd Process of papermaking
US2929153A (en) * 1955-11-29 1960-03-22 American Viscose Corp Drying apparatus for sheet material
US2837830A (en) * 1956-06-19 1958-06-10 American Viscose Corp Method and apparatus for drying flexible sheet material

Cited By (10)

* Cited by examiner, † Cited by third party
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US20050160621A1 (en) * 2002-06-29 2005-07-28 Wilhelm Hartmann Circulating air dryer for material webs
US20070193060A1 (en) * 2004-03-02 2007-08-23 Nv Bekaert Sa Infrared drier installation for passing web
US20080256818A1 (en) * 2004-03-02 2008-10-23 Nv Bekaert Sa Drier Installation for Drying Web
US7918040B2 (en) * 2004-03-02 2011-04-05 Nv Bekaert Sa Drier installation for drying web
US7926200B2 (en) * 2004-03-02 2011-04-19 Nv Bekaert Sa Infrared drier installation for passing web
US20080276488A1 (en) * 2007-05-07 2008-11-13 Paul Seidl Step air foil web stabilizer
US8061055B2 (en) * 2007-05-07 2011-11-22 Megtec Systems, Inc. Step air foil web stabilizer
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process
US9809693B2 (en) 2012-03-30 2017-11-07 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process

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GB935757A (en) 1963-09-04
NL268857A (xx)

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