US1114215A - Drying-machine. - Google Patents

Description

J. 0. WOODSOME.

DRYING MACHINE.

APPLICATION FILED AUG.19, 1911.

, Patented Oct. 20, 1914.

4 SHEETS-SHEET l.

vw, I iiw J. O. WOODSOMB.

DRYING MACHINE.

APPLICATION FILED AUG.19, 1911.

.4 SHEETSSHEET 2.

o .a @ll 513551212335 WITNESSES INVENTOR m wdwarmw J. 0. WOODSOME.

DRYING MACHINE.

APPLICATION FILED AUG.19,1911.

Patented Oct. 20, 1914.

4 SHEETS-SHEET 3.

WITNESE'LQ INVENTOR v 1 I: WWW/W y ofw fir W? J. O; WOODSOME.

DRYING MACHINE.

APPLICATION FILED AUG.19, 1911.

1,1 14,21 5. Patented Oct. 20, 1914.

4 SHEETS-SHEET 4.

WITNESSES INVENTOR UNITED STATES PATENT orFroE. I

JOHN o. WOODSOME, or cHIcAeo, ILLi'Nois assrenon T CRANE counter, or

' CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS;

DRYING-MACHINE.

a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have made certain new and useful Improvements in Drying-Machines, of

which the following is a specification.

This invention has reference to drying machines, such for example as paper making machines, cloth drying machines and the like, wherein steam is used as a heating or drying agent; It has for its rimary objects an improved arrangement 0 -drying machines whereby the greatest possible number of heat units are utilizedthereby eifecting a great saving in operation; and an increase in efliciency; the provision of improved means'for securing proper temperature in the heating or drying cylinders of the apparatus; the provision of improved means for preventing the accumulation of water of condensation in the drying cylinders, and in general the provision of an improved arrangement of drying machine which is silnple and very economical, eflicient in operation and easily regulated.

These together with such other objects as may hereinafterpappear, or are incidental to my invent on I obtam by means of a construction lllustrated in preferred form 1 in the accompanying drawings, wherein 5 and it is one of the chief objects of my in- "vention to provide means for keeping the Edrying rolls comparatively free from con-- densation, thereby facilitating proper regulation of temperature.

Figure 1 is a diagrammatic side elevation of a paper machine,

Figure 2 is a section on the line IIII' of Figure 1 drawn to an enlarged scale,

Figures 3 and 4 are respectively a plan and side elevation of a detail of my'inven- Figure 1, it will be seen that I have dia-v grammatically illustrated apaper machine tion,

Figure 5 is a section on an enlarged scale through an improvedvacuum breaking apparatus I employ in carrying out my invention, and

Figure 6 is a plan view of another detail of my invention. In the drawings I have shown my invention applied to a paper making machine, but it will be understood that the invention is equally well applicable to cloth drying machines or other similar dryingmachines especially where steam is the heating or drying agent employed. In making paper by machines the'p'aper pulp is passedv chine contains substantially 50% of water Specification of Letters Patent.

- of hollow heatin and leaves-the machines in the form of paperwith substantially no moisture,'thewater being gradually dried out or evaporated as the pulp passes .over the drying cylinders. Incloth drying machines the moisture is taken out in a similar manner. It is well known to those familiar with this art that Patented oat. 20,1914. Application filed August 19, 1911. SeriaI No. 645,008. I

depends upon the maintenance of proper temperatures in the drying cylinders, any material variation from the correct; temperature resulting either-ina total lossv or an inferior grade ofarticle. In paper making machines if the temperature be too high in the first cylinders the pulp will be blown away from the cylinders or will crack or cockle which necessitates a closing down of the machine and entails a loss of time and labor. Heretofore paper making machines have been usually dlvided into two sections,

in the first of which steam at low pressure is used as the heating agent, and'in the sec- 0nd steam at a higher pressure, which gives the second. section a higher temperature than .the first section. The,difiiculty in maintaining proper temperatures in these sections arises chiefly from the accumulation of condensation in the drying rolls and from the. failure to secure a'proper r te offlow of steam from the steam inletside of the machine to the return or discharge'side,

",Referrin to the drawings, particularly composed of four. sections, A, B, C and D, or drying cylinders or rolls 1 of the usua type. Steam is supplied to the sections B, C and D from pipes l 1'1', which lead into supply headers'2- 2 2, from which the steam is carried into the drying cylinders 1, by means of the pipes 33, a few only of which are indicated. These pipes 3 enter onetrunnion of the cylinders in the usual mariner (see Figure 2). On the discharge or return side of the machine I have provided a receiving header 4 for each section these receiving headers being connected to one trunnion of each drying roll by means of the connecting pipes-7-7 in the usual manner. :It will be already stated hereinafter be set forth- The receiving headers are connected' to controllers 6 by means of the pipes 5, each one of which is connected to the receiving headersat several points. The controllers 6 are provided to receivewater of condensation from the apparatus and are connected to a live steam pipe 8 which in turn has communication with a source ofsteam supply at a point beyond that part of the pipe shownv broken away at .the right hand of Figure 1, and are also connected by means of the outlet connections 9' to a discharge pipe 9 leading to the boilers or elsewhere. The controllers for the sections B, G and D are also pro-.

vided with pipes 101010, (hereinafter termed vent pipes) which provide an outlet for the steam from the controller to 'a' pipe 2 which is connected at a point'marked 11 with the header 2 in the section A, for a purpose which will hereinafter appear.

Referring now to Figures. 3 and 4 it will be seen that the controller 6 comprises a tilting tank 16 mounted for oscillation in the framework 17 on the trunnions 18 and 19 as is usual. As here shown and referring more specifically to any one of the sections B, C or D, the numeral 5 indicates the pipe leading from the receiving header 4 to the controller; 9 indicates the pipe connecting the "controller to the main discharge'line 9; 10 is the ventpipe leading from the controller tothe pipe 2 which as communicates with the header 2 for the section A; and 8 is the live steam supply pipe which connects the steam pipe 8 with the controller. These various pipes are controlled by valves in casings which open into the trunnions 18 and 19, the valve 20 controlling the steam outlet or vent pipe 10; thevalv'e 21 the live steam inlet pipe 8; the check valve 22 controlling the condensation inlet pipe 5; and the valve 23 the discharge or outlet pipe 9.

The valves 20, 21, and 23 are operated by the .tilting of the tank through the rods .24 actuating the stems 26 carried by the levers 25 which are fulcrumed as indicated at 26?, the parts being so arranged thatwhen the.

discharge valve 23 and the live steam inlet valve 21 are closed, the ventor steam outlet valve 20 is open and the check valve 22 similarly open so as to permit the condensation to enter the tank. When the'tank is depressed to its lower position the steam inlet.

valve 21 and the discharge outlet valve 23 are opened and the vent valve 20 and the check valve 22 are closed. The said trunnions and valve casings .of the controllers are of the type usually employed in steam traps and are further providedgwith the discharge pipe 27 and the steam opening 28 located m a divided 28"Which projects into the tank.

From the foregoing it is apparent that when thetank is in raised position and receiving condensation from the pipe 5 through the open check valve 22, reduction of pressure in the tank is efiected through the open valve 20 communicating with the vent .pipe 10. When'filled, the contents of the tank overbalances the weight 16 thereby depressing the tank and closing the last mentioned valves and simultaneously opening the valves 21 and 23. The live steam from the pipe 8 then passes through the valve 21, trunnion 19, one division of the divided T, and opening 28, forcing the contents of the tank through the pipe 27, the other division of the T, trunnion 18, valve 23 and thence through the pipe-9. The tank then reverts to its former position through the action of the counter-balancing weight.

Figure 5 is a section through the check Valve 22 and the valve 29 which latter is de signed to automatically break any vacuum forming in the drying apparatus. This valve comprises a disk 30, stem 31 and seat 32 and is normally held in closed position by means of the spring 33 mounted on the stem 31. A foraminousintake plate 34 is mounted above the stem and permits the en-, trance of air through the valve into the main. valve chamber when any vacuum in the pipe 5 overcomes the pressure of the spring 33 and unseats the disk 30. Y

Figure 6 is a plan view of the valve an d illustrates the intake plate. It will be apparent that the swing check valve 22 not only serves to prevent a back flow into the pipes 5 when pressure is admitted to the controller in order to discharge the collected condensation therefrom, but also prevents any vacuum fromdrawing condensation from the controller back into the apparatus and permits the operation of the vacuum breaking valve 29.

Referring to the arrangement of the controller and piping for the section A, it will be seen that the vent pipe 10' instead of leading to the pipe or header 2' leads into one of th'e trunnions of the first drying cylinder 12.

steam will now be set forth; From each of A discharge pipe 34 leads from the trunnion 115 and emptiesinto the main discharge or return pipe 9 to the boiler. The plpe. 34 may be opened to the atmosphere at the 'POlIlt mark d 34, in cases where the dlscharge pipe leads to a boiler or the like. In cases where the discharge pipe has a free end that is open to the atmosphere it will not be necessary to have the pipe 34 open to the atmosphere. The previous arrangement 15 the more advantageous in that there is but little wasteof steam.-

The source of steam supplled to the sections 13, O and D has been described and the manner of supplying the section A with the receiving headers ,4 a pipe marked 36 1'5. tion A throughthe pipe leads to the pipe. 2". These: pipes 36 are provided with controlling valves F and with.

the pipes 7 into the receiving headers 4: and

thence into the pipes 3.6. It passes through the pipes 36 into the pipe 2 and from the pipe 2' it enters the header 2 for the section A at the. point marked 11. From the header 2 it enters the drying cylinders of the secs 3. A portion of the steam which enters the sections G and D condenses and,'de'pendent upon the rate of flow of steam through these cylinders, the condensation may remain-in suspension .in the steam or it may flow into the receivers or headers 4, which have a large area so that this condensation which is at a comparatively high temperature will at least partially turn back into steam at a lower pressure and temperature and be carried throughthe pipes 36 into the pipe 2. I have found by tests that there is a comparatively small amount of condensation from the section D which-remains in the form of.

water and passes into the controller 6 for this section. In the section'C a larger portion of the condensation remains in the form of water and enters the controller 6. In the section B the same'conditions as those de- 1 scribed in the sections C and D take place,

Q but not in the same degree. Inthe sections over these sections.

B, and D where the steam is supplied at a temperature above 212, the sensible heat .is utilized in drying the paper as it passes It enters the section A at substantially 212 and the'latent heat contained in the steam is here utilized for heating the drying cylinders. The section A is the section which first receives the pulp and consequently this section must do the bulk of the work in evaporating the mois- ,ture from the pulp. I have found that the uselof the latent heat units in steam for heating the first section is most effective inasmuch as the latent heat'can be absorbed or taken from the steam as fast as it can be supplied. This arrangement is veryadvantageous inthat the bulk of the drying or evaporating of the excessive moisture from the pulpshould be donein the first section at a temperature which will not be so high as to cause the formation of steam between the pulp and its conveyer over the cylinders, which-formation of steam causes the'blow-ing away of the pulp. The use of the latent heat units glves a large proportion ofiheat at a comparatively low't emperature. When the machine s once in oper- .ation the section A ,acts asacondenser. for

the entire apparatus, the steam substan tiallyat 212 1n this section condensmg so rapidly that it induces a constant flow of large volumes of steam from the heating cylinders of the sections B,C and D through 7 the pipes 36, pipe 2 and header 2*. This flow. of steam fromthe sections B, O and D to the section A has two important results, first in that it prevents any accumulation of condensation in the drying cylinders of these, sections, and second in that it affords a means for regulating the temperature ofv the sections. The. collection of condensation in the drying cylinders B, C, and D has been found to be detrimental because it would cause a variation in the temperature and as previously pointed out, .material variations in the temperature of the various drying cylinders result in reducing the eificiency of the machine both in capacity and product. The velocity ;of the flow of steam from the drying cylinders through the pipes 36 can be regulated by means of the controlling valves F, and-the temperature of the sections B, C and D is greatly dependent upon the rate of flow of the steam from the steam supply side to the discharge. side. It will be thus seen that by this arrangement a very simple, effective and, accurate means for controlllng 95.; the'temperature of the sections is provided.

:In conjunction with the control afiorded by the valvesF, the valves G provided in the lvent pipes 1O serve to aid in controlling the temperature. The rapid consumption of steam in the section A also induces 'a flow' of steam through the controllers and through the vent pipes 10 which has-a -tendencyto draw the condensation collecting in the cylinders al'IdLI'GCGlVGIS 4 into the controllers 6' from whence it can be discharged. The rate of flow of condensation from the re-' ceivers into the controllers is determined by the flow of steam in the vent pipes 10 just described. This rate of flow is regulated by the valves-G. The valves 14 and 15-respectively the pipes 3 and 7. afford a, means for cutting out individual drying cylinders in case of breakage or leakage and -thepheck valves 36 and 35 prevent. any back" flow-into the pipes 36 and vent pipes 10.

In order to secure a fiow through-the drying cylinders of the sections A, I have provided the following arrangement; the first roll 12 of this section is not connected to the header 2*, andthe vent pipe 10 in this case connects the controller to a trunnion .of the cylinde'r'12.- The discharge pipe 34 leading from the cylinder 12 is normally open to the atmosphere at the point marked 34, which permitsla flow from the steam inlet side to the discharge side of the cylinders of this section. In this way all the air in the. apparatus finds a means of escape. As;-

the condensatlon in this section which redensation from the controllers is at a higher pressure than that supplying the cylinders and consequently passes from the controllers through the vent pipes 10 into the pipe 2' in the case of the sections B, C and D, and in section A it passes through the vent pipe 10 into the cylinder 12. It is in both cases utilized for heating the cylinders and affords a saving.

I have found that by dividing the appa ratus into four sections of drying cylinders, a better quality of article is secured and the eificiency of the machine greatly increased, particularly with respect to the amount of production. By supplying each section independently with steam and by providing a receiver for each section, and by using the section A as a condenser for the apparatus, 1 am enabled to regulate and maintain the temperature of each section at any degree, which is best suited to the particular work in" hand. By utilizing the sensible heat units and also the latent heat units in the steam it will be obvious that a great saving is efiected in operation in addition to the beneficial resultspreviously pointed out which are obtained by usingthe latent heat units in heatin the rolls of the first section, The receiving eaders 4 are of large diameter in order that the condensation will collect in the bottom and not interfere with the flow of steam to the pipes 36, besides affording a large area to permit-condensation at a high temperature-to flash to steam at a lower temperature, which steam passes to the section A of the machine as previously described. f

In cloth drying machines the drying cyl 'inders are very thin and the formation of a vacuum will cause a breakage in the cylinders. Vacuums form in the cylinders almost coincident with the shutting ofl of pressure when the machine is closed down for any purpose. It has also been found that the formation of vacuums following the shutting off ofthe steam causes the packings of the trunnionsof the cylinders to loosen and cut out, entailing quite a loss 'of time and labor. By my improved arrangement there is no binding in the entire apparatus and the air can reach all parts of the machine so rapidly that but one vacuum breaking valve 'is required in each section: This *is'thevalve in the controller marked 29. Heretofore in cloth drying machines each indibeing the only point .normally open to the atmosphere. There is however but a trifling waste of energy, inasmuch as the section A condenses the steam so fast that there is hardly any flow to the cylinder '12 through the controller andvent pipe 10'. That the arrangement is not only economical-in this heat units contained in the steam will readily be apparent. I have found-that by my improved arrangements, 2 the apparatus will operate with great efliciency even when run on steam supplied at lowpressure, which vidu'al roll has been provided with a vacurespect, but also in the saving it effects in utilizing the greatest number possible of the also effects a great saving. In addition to the advantages already set forth the'securing'of a flow of steam through the apparatus is advantageous in that the air which forms in the cylinders during use is carried along with the steam and eventually 'finds an escape through the pipe 34 of the first cglinder 12. This is a convenient metho of taking care of the air in the apparatus and does away with the use of manually operated by-passes which have ordinarily been found necessary in devices of this character.

These and other advantages will be readil seen by those familiar with the art;

The receiving pipes H may be appro priately termed return or discharge pipes,

and the section A may likewise be termed a condensing system,-.as besides serving to dry the material as it passes over thecylinders, it serves as a condenser for the balance of the apparatus in order to induce a proper flow of steam through the other sectlons as has been previously pointed out.

Having thus described my mventlon and illustrated its use what I claim as new and desire to secure by Letters Patent is the following 1. In an apparatus scribed, the combination of a set of hollow drying rolls overwhich the paper stock first passes, a, second set of. hollow'drying rolls over which the paper stock subsequently" passes, means for, supplying steam to the of the character'desecond set of rolls, and a tubular connection f leading from the second set to the first set of rolls and directl communicating adjacent one end with t e outlets of the second set and adjacent the other end with the in lets of the first set of rolls to supply the latter with steam, the first set of rolls constituting a condensing system adapted to cause a. rapidcflow of steam through the rolls of the second set by condensing the steam and reducing the pressure in the tubular connection, said flow being-variable to accommodate'the load of the apparatus.

2. In apparatus of the character described thecomblnation ofa plurality of drying cylinders arranged in two sections, a steam supply pipe connected to the cylinders of the first section, a controller, a receiving pipe connected to the cylinders of the first section and leadingto the controller, a connection from the receiving pipe to the cy inders 'of the second section, and means for discharging the controller of condensation, the receiving pipe and vits connection providing an unobstructed passage for conveying the steam from the cylinders of the inlet side of the first section to the cylinders of the second section, I

- 3. In apparatus of the character described, the combination of a plurality of hollow heating rolls arranged in two sec- "tions, a steam supply pipe for the cylinders of the first section, a controller, a, receiving pipe connected to the cylinders of the first section and leading to the controller, a connection between the receiving pipe and the cylinders of the second section, for conveying the steam from the c linders of the first section to the cylinders o "the second section, a steam supply pipe for the controller, a discharge pipe for the controller, a vent pipe leading from the controller to the connection between the receiving pipe and the I cylinders of the second section, and valve scribed, the combination of a mechanism for governingdischarge of the hollow heating rolls arranged .111 two sections, a-steam supply pipe for the cylinders of the first section, a controller, a receiving pipe connected to the cylinders of the first section and leading to the controller, a connection between the receiving pipe and the cylinders of the second section for convey: ing the steam from the cylinders of the first section to the cylinders of the second sec tion, a steam supply pipe for the controller,

a; discharge pipe for the controller, a vent pipe leading from the controller to the connection between the receiving pipe and the cylinders of the second section, a check valve-in the vent pipe, and valve mechanism for controlling the discharge of the controller.

5. In an apparatus of the character described, the combination with a plurality of grouped drying cylinders over which a portion of the paper web in its travel is adapted to pass, means for supplying steam thereto,"a condensing system having a tubelar feed connection leading thereto from the cylinders and constructed to communicate freely with the outlets of the cylinders and the inlet of the system, said condensing sys- ,telll being adapted to direct heat to another portion of the paper web and for condensing the steam whereby to reduce the pressure in the tubular connection adjacent the outlets and cause a rapid flow of used steam from the cylinders to the system, substantially as described;

6. In apparatus of the character described, the combination of two hollow drying cylinders, a steam supply pipe leading to one of the cylinders, a connection from the said cylinder to the other cylinder for.

conveying the steam from the first mentioned cylinder to the second cylinder, a

controller adapted to receive the condensation of the second cylinder, and means for discharging the controller of its contents, the second cylinder condensing the steam :it receives thereby causing a flow of steam from the first cylinder to the second.

7. In apparatus of the character described, the combination of two hollow drying cylinders, a steam supply pipe leading to one of the cylinders, a controller, a receiving pipe leading from the said cylinder to the controller adapted to carry the condensation of the said cylinder to the controller, a connection between the receiving pipe and the second cylinder for conveying the steam from the first cylinder to the second cylinder, the second cylinder condensing the steam it receivesthereby causing a flow of steam from the first to the second cylinder,

'a steam supply pipe for the controller, a discharge pipe leading from the controller, :a vent pipe leading from the controller to the connection between the receiving pipe and the second cylinder, and means for discharging the second cylinder of condensation.

8. In an apparatus of the character described, the combination with a plurality of drying cylinders; over which a portion of the paper web in its travel is adapted to pass, a steam header having branch connections leading. to the inlets of the cylinders, a condensing system, and a feed connection leading from the cylinders to the condensing system comprising a return header formed with inlets in its wall communicating di-- rectly with the outlets of the cylinders, to equalize the pressure therein, the condensing system being adapted to direct heat to another portion ofthe paper web and for condensing the steam whereby to cause a rapid flow of used steam iii-om the outlets of the cylinders and through the said'connection to the system.

9. In apparatus of the character described,

the combination of two hollow drying cylin ders, a steam supply pipe leading to one of the cylinders, a connection from the said cylinder to the other cylinder for conveying the steam from the first mentioned cylinder to the second cylinder, a controller adapted to receive the condensation of the second cyl-' inder, means for discharging the controller of its contents, the second cylinder condensing the steam it receives thereby causing a flow of steam from the first cylinder to the second, and means for controlling the said flow of the steam thereby regulating the temperature of the first cylinder.

10. In apparatus of the character described, the combination of a series of hollow drying cylinders arranged in two sections, a steam supply pipe leading to the cylinders in one section, a return pipe for each section connected to the cylinders of each section, a pipe leading from the return pipe in one of the sections to the cylinders in the other section, a controller connected to each return pipe for receiving the condensation of both sections and means for dischargingboth controllers. I

11. In a sectional drying machine of the character described, the combination of a plurality of sections of drying cylinders, steam supply pipes leading to some of the sections, a return or discharge pipe for each of the sections, connections leading from the return pipes of the steam supplied sections to the cylinders of the remaining sections to convey the steam from the first mentioned sections to the said remaining sections, and means for discharging the return pipes of condensation.

12. In apparatus of the character described, the combination of a hollow drying cylinder, a steam supply pipe leading thereto, a receiving or discharge pipe connected to the cylinder, a condensin system connected tothe receiving pipe a apted to cause a flow of steam through the cylinder by condensing the steam and reducing the pressure in the said receiving pipe and means for automatically breaking any vacuum forming in the drying cylinder. I

13. In apparatus of the character .de

scribed, the combination of two-hollow drying cylinders, a steam supply pipe leading to one of the cylinders, a connection from the said cylinder to the other cylinder for conveying the steam from the first mentioned cylinder to the second cylinder, a controller adapted to receive the condensation of the second cylinder, means for discharging the controller of its contents, and means in t e controller for automatically breaking any vacuum forming in, the apparatus, the second cylinder condensing the steam it receives thereby causing a flow of steam from the first-cylinder to the second.

14. In apparatus of the character described, the combination of a series of hollow drying cylinders arranged in two sections,

trollers for automatically breaking any vacuum forming in the apparatus. 4 v

15. In apparatus of the character described, the, combination of two hollow drying cylinders, a steam supply pipe leading to one of the cylinders, a connection leading from the said cylinder to the other cylinder, a discharge pipe for the second cylinder, the

second cylinder condensing the steam it reond section for conveying the steam from the first section to the second section, a return pipe for the second section, a'con tr'oller connected to the return pipe adapted.

to receive the condensation of the section, a

cylinder forming a part of the second sec-v tlon of cylinders, but not connected thereto, a vent pipe leading from the controller to the said cylinder, and a discharge pipe leading from the cylinder. a

17 In combination in a fabric making machine, a set of hollow drying rolls over which the fabric first passes, asecond set of hollow drying rolls. over which the fab- .ric subsequentlypasses, means for supplying steam to the second, set of rolls, means for conducting the steam to. the first set of rolls after its passage through the second set, and a controller for disposing of the condensation from the first set of rolls, the

said-controller constituting the only outlet -means from the first set of rolls, so that all.

of the steam supplied to the first set of, rolls is condensed therein. I

18. In combination in a fabric making machine, 'a set'of hollow drying rolls over which the fabric passes, means for supplying steam to the rolls, and a controller for disposing of the condensation from the set of rolls,'the said controller constituting the only outlet means from the rolls so that all lfi5 of the steam supplied to the rolls is condensed therein.

' thereto, a receiving 19. In an apparatus of the character described, a plurality of hollow drying rolls over which the fabric passes, means for supplying steam to the rolls, a receiving header for the rolls, and a device connected with said header for breaking any vacuum forming in the rolls.

20.- In' an apparatus of the character described, a group of steam supplied hollow drying rolls over. which the web passes, a receiving header for the rolls, and a means connected with said header for receiving the condensation from the header and for breaking any vacuum forming in said rolls.

21. In anapparatus. of the character described, the combination with a plurality oi grouped hollow drying cylinders over which a portion of the paper web-in its travel is adapted to pass, means for supplyingsteam header formed With inlets connected directly with the outlets of outlets of said cylinders by condensing the the cylinder and positioned out of the line' of "paper travel to receive the used steam from the cylinders, and a condensing system connected with the said headeixand adapted to cause a rapid flow of steam through the to induce a rapid flow of signed my name in steam and reducing the pressure in the said receiving header below that of the cylinders, said system being arranged with reference to the group of cylinders so that the 'used steam is'induced to flow in a direction opposed to that of the travel of the web to heat another portion of the web, substantially as described.

22. In an apparatus of the character described, the combination with a plurality of hollow drying cylinders provided with outlets, means for supplying steam thereto at a given pressure, a condensing system, and'a connection between the condensing system and the cylinders adapted to communicate with the outlets of the cylinders said condensing system forming a part of the apparatus and adapted to condense the used steam received from the cylinders whereby steam through the outlets without substantially differentiating the pressures in the cylinders. In testimony whereof I havethe presence of the two subscribed witnesses.

- JOHN O; WOODSOME. -Witnesses:

C. J. ScmPrLooK, L. GLEIsER.

hereunto

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