US2429338A - Drum drier for web with radiant heater - Google Patents

Description

Oct. 21, 1947. F. w. ADAMS DRUM DRIBHi FOR WEB WITH RADIANT HEATER Filed April 2, 1945 IIIIII/IIIIIIII/I/III III/11111111!!! I III/III mvmrox 4 Floyd W/ldam; BY

ATTORNEY Patented Oct. 21, 1947 2,429,538 DRUM DRIER FOR WEB wrrn nmrna RADIANT Floyd W. Adams, Los Angeles, Calif., assignor to Los Angeles Paper Box Factory, Los Angeles, Calif., a corporation of California Application April 2, 1945, Serial No. 586,214

1 My invention relates to an apparatus for drying a web of material, whether paper, fabric or other material. An important. object of the invention is to provide a method and means whereby moisture, in the form of steam generated by radiant heat, may be removed from such material under less than atmospheric pressure.

Another intent is to carry out the foregoing object without bringing the material being dried into contact with a hot metal surface, which may dry the material too quickly and char the sur- My invention also has for its objects to provide such means that are positive in operation, convenient in use, easily installed in a working position and easily disconnected therefrom, economical of manufacture, relatively simple, and of general superiority and serviceability.

The invention also includes novel details of construction and novel combinations and arrangements of parts, which will more fully appear in the course of the following description. However, the drawings merely show and the following description merely describes one embodiment of the present invention, which is given by way of illustration or example only.

In the drawings, like reference characters designate similar parts in the several views.

Fig. 1 is a longitudinal, sectional view of an embodiment of the foregoing objects, taken on the line l-l of Fig. 2.

Fig. 2 is a transverse section taken on 2 2 of Fig. 1.

Referring more in detail to the drawings, the reference number 5 generally indicates a drum that is rotatably mounted upon bearings 6. The body of the drum 5 is perforated, as suggested at l, for a purpose hereinafter more fully described. A ring gear 8 is arranged on the periphery of the drum 5 to be driven by suitable gear means (not shown). Support means are indicated at 9 for the bearings 6. A bar II) also on the support means 9, in turn supports a partition 12 within the drum 5. The partition l2 extends from side to side within the drum and may be slightly dished, as shown in Fig. 2. End walls l3, disposed within the drum 5 and mounted on the partition 12, aidin closing the space H between the partition and the circumferential wall of the drum. A pipe 25 connects the space I 4 with any suitable means (not shown) for producing a vacuum. A resilient gasket l5 provides a substantially air-tight fit between the partition l2 and the drum 5, and a resilient gasket l6 provides a similar fit between the end walls l3 and the drum 5.

In order to insure a close fit between the gaskets l5 and I6 and the inner face of the drum 5, I provide spring means II to urge the gaskets the line into a yielding fit. The coil spring l1 slides- 3 Claims. (Cl. 34-122) lengthwise of a core member 18 that holds the spring in alignment. The core member I8 is threaded to receive a nut l9 thatrests in a recess on the bar [0. The nut is useful in adlusting the tension on the spring I! and thereby on the packing, to take up for wear. Pins 20, slidable in openings 2| in the bar In, guide the movements of the partition IZunder the infiuence of the spring I! and to resist turning movements of the partition 12 with the drum.

- A hood 22 is likewise mounted on the support 9 andarranged in spaced-relation around the rotating drum 5. The hood is suitably insulated exteriorly, as shown at 23. Interiorly the hood has a series of radiant gas burners 24. These may be of the type shown in my co-pending application, Serial No. 558,869, filed October 16, 1944, on Process and apparatus for drying paper," or, if preferred, infra-red lamps may be used. Either of these heating means will 'provide penetrating heat, which is desired. It is believed clear to those skilled in the art that suitable connections are made to the heating means.

The present method may be described in connection with the operation and use of my present apparatus. It is, of course, a well known fact that water boils at less than 212 F., when subjected to less than atmospheric pressure.

My present method and apparatus take advantage of this fact, in order to remove moisture from the material by the expenditure of less heat.

A web 28 of wet material, such as paper, fabric or other wet material rests on the drum 5 and travels around with the surface of the drum.

In the case of paper, this web 28 may have as F., and draws steam generated therein, throughthe openings 1 into the space M, and therefrom through the pipe 26. Of course, the greater the vacuum, the lower the boiling point. Since no hot metal surface contacts the material, the intensity of the heat can be relatively high with out injuring the material 28. Inasmuch as the temperature of the undried material cannot be raised above the boiling point of the moisture in the material, as long as there is any water left in it, high heat'intensities can be employed without injury to thematerial, consequently ef-.

i'ecting a fast and economical drying.

While I have illustrated and described what I now regard as the preferred embodiments of my invention, the construction and the steps and sequences ofsteps are, of course subject to modifications without departing from the spirit and scope of my invention. 1, therefore, do not wish to restrict myself to the particular form of construction, steps, or sequences of steps described beyond the ends thereof, a -longitudinally ar,,

ranged transverse partition within the drum andterminating'short of the ends thereof, resilient gasketmeans sealing between the lateral edges of said partition and the inner surface of the drum, :1 segmental end wall unitary with and extending from each end of the partition, each wallhaving a curved edge conforming generally to the inner curvature of the drum, resilient gasket means sealing between said curved edges and the drum, said partition, end walls, and that portion of the drum that is subtended by the partition between the walls defining a vacuum chamber, longitudinally spaced means interconnecting the fixed member and the partition for exerting pressure on the latter to effect intimate sealing contact of both gasket means .with the inner surface ofthe drum, and radiant heat means applied to the outer surface of the web whereby the resultant evaporation of moisture in the web is drawn into the vacuum chamber through the drum perforations.

2. Apparatus for drying a web of moist material, comprising a perforated drum mounted on end hearings on which said drum is rotatable to move a web trained therearound, a fixed member extending longitudinally through the drum and beyond the ends thereof, a longitudinally arranged transverse partition within the drum and terminating short of the ends thereof, resilient gasket means sealing between the lateral edges of said partition and the inner surface of the drum, a segmental end wall unitary with and extending from each end of the partition, each wall having a curved edge conforming generally to the inner curvature of the drum, resilient gasket means sealing between said curved edges and the drum, said partition, end walls, and that portion of the drum that is subtended by the partition between the walls defining a vacuum chamber,

tact of both, gasket means with the inner surface of the drum, said:latter means comprising tension-adjustable springsapplied to the ends of the partition and to at least one intermediate portion thereof, and radiant heat means applied to the outer surface of the web whereby the resultant evaporation of moisture in the web is drawn into the vacuum chamber through the drum perforations.

3. Apparatus for drying a web of moist material, comprising a perforated drum mounted on end bearings on which said drum is rotatable to move a web trained therearound, a fixed member extending longitudinally through the drum and beyond the ends thereof, a longitudinally arranged transverse partition within the drum and terminating short of the ends thereof, resilient gasket means sealing between the lateral edges of said partition and the inner surface of the drum, a segmental end wall unitary with and extending from each end of the partition, each wall having a curved edge conforming generally to the inner curvature of the drum, resilient gasket means sealing between said curved edges and the drum, said partition, end walis,'and that portion of the drum that is subtended by the partition between the walls defining a vacuum chamber, longitudinally spaced means interconnecting the fixeddrum, and radiant heat means comprising a plurality of heater units disposed in an arcuate arrangement concentric with the drum for uniform spaced relation thereto, said means thereby applying uniform heat to the outer surface of the web on the drum to evaporate moisture in said web, and said vacuum chamber being effective to draw said moisture evaporation through the drum perforations. l

FLOYD W. ADAMS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name I Date 776,197 Nistle Nov, 29, 1904 1,025,822 Millspaugh May 7, 1912 1,438,129 Milkey Dec. 5, 1922 1,742,365 Moone Jan. 7, 1930 1,862,909 Russell June 14, 1932 2,252,181 Hunter 'et al Aug, 12, 1941

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