US1844658A - Drier for paper-making machines - Google Patents

Description

Feb. 9, 1932.

H. E. HOLCOMB DRIER FOR PAPER MAKING MACHINES Filed June 29, 1928 INVENTOR Early Ef/Yoco/fz BY A TORNEYS @M A N i l im. @www C C wwf @C xX C\ wm. .$1 u ---5--- ---I NW1-- NJW., 1 NN WN wm. QM. N

Patented Feb. 9, 193.2l

UNITED sTaTlezs' PATENT OFFICE' HARRY E. HOLCOMIB, `OJ? STRATFORD, CONNECTICUT, ASSIGNOR TO FIBEBFRAKS, INC.,

OF NEW YORK, N. Y., A CORPORATION OF NEW YORK Damn ron PAPE-amante MACHINES Application led June 29, 1928. Serial 110.289,248.

This invention is concerned with the rovision of a drier for paper making mac ines, adapted to receive the wet liber web from the pulp tank and deliverit in a dry condition.

An object of the invention is to provide a drier 1n which a break occurring in thetiber web inthe course of its passage through thedrier does not necessitate stoppageof the machine and the resultant overdrying of a por-A tion of the'web.

Another object is to provide a drier which may be substantially enclosed, and in consequence a drier which maybe heat insulated as opposed to the present open type driers roxn1 which much heat is continually dissipate Another object is toprovide a drier which is highly ciicient in operation due not only to its heat insulating qualities, but due to the manner in .which the paper web is subjected to the action of drying air currents.

Another object is to provide a drier in which the use of steam heated rolls is avoided, and the difliculties and disadvantages incidental to the use of such rolls consequently eliminated. Notable among such disadvantages are the matting and ironing of the paper, the sticking of the paper on the rolls ewhen the travel of the web is temporarily stopped, and the consequent breaks in the web caused by such sticking.

Another object is to provlde a drier utillzing dryin air currents of considerable force and velocity, while at the same time so supporting the pa er web that it is sustained against sagging y its own weight and agamst deflection under the force of vsuch air currents. l

vStill another object of the invention 1s t o provide a drier which Will turn out a unlform, porous, unbroken web of paper and which 1s thereore peculiarly adapted for use as an elemento'f a continuous rocess machlne.

Otherfandmore general o jects of the- 1nvention are to `rovide a drier of simple ractical constructlon which will be rugge durable and eiicient in use and whichis well suited to the requirements of economical manufacture and inexpensive operation.

In a preferred embodiment of the inventionfth'e wet ber web is stripped from its collector screen by a suction apparatus and passed into the drier where it is received between a pair of endless reticulated supporting webs which car it in a tortuous path around a suitable serles of guiding rollers.

In the course of its travel the web is substantially continually subjected to a strong draftnpf hot drying air, the foraminous nature'of the supporting webs permitting free passage of the air currents over both surfaces of the paper.

Preferably the various runs of pa er coopcrate with suitable baille means to irect the course of the drying air currents, and the path of travel of the air current in intimate relationship with thepaper is a relatively short one. By virtue of this arrangement I materially improve the action of air drying machines in which the air currents are caused to travel in a long tortuous pathv over the web and become so thorou hly humidied by the wet pa er web that t eg' have lost most of their e ectiveness long efore they pass to exhaust from the drier.

With the above noted and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements'of parts as willbe more full hereinafter described and pointed out in t e claims.

The invention may be understood V more fully from the following description in connection' with the accompanying drawing which is a somewhat schematic, vertical sectional view through a drier embodying the invention, illustrating diagrammatically the pulp tank from which the wet paper web is assed to the drier and the roller for passmg the dry paper from the drier to the sat-I urating tank or other apparatus.

A drier chamberor dr house 10 is substantially wholly enclose save for the two small openings 11 in one end to accommodate the two horizontal runs of the endless delivery web 12 and the slot 13in the opposite end through which the dried pa er web 14 emerges and is passed over a ro er 15.

The delivery web 12, of felt or other suit- 17 mounted exteriorly and interiorly respectively of the drier. The lower run of the endless web 12 passes closely adjacent a suction head 18 which serves to `strip the wet fibrous sheet fromthe endless collector web 19 upon which the fiber has been deposited in the pulp tank. The suction head also serves to remove some water from the web.

The fiber sheet is held against the under face of the lower run of the web 12 by sucper guiding` rollers 23. Each substantially vertical run of the webs from the upperrollers to the lower rollers or vice versa swings n back toward the end of the drier which the web has entered. The only longitudinal movement of the web through the drier is accomplished as the web passes from one lower roller to another or from one upper roller to another. By this expedient the web is caused to travel a long distance and is subjected to the action of a considerable quantity of drying air, while it is passing through a comparatively short drying chamber.

Bailles extending transversely of the drying chamber cooperate with the webs to direct the.

course of the air currents. ,Two sets of such batlies are used, the lower set .being of J-shape and the upper set being of inverted J-shape. The hook shaped 4bottom 24 of each lower deflector rather closely follows the path 'of the webs around a pair of lower rollers 22 and the vertical leg 25 of this baille extends upwardly between adjacent vertical runs of the web .and terminates between and adjacent a palr of upper rollers 23. The upper baffles on the other hand include hook shaped portions 26 substantially embracing the pairs of spaced upper rollers 23, and depending leg portions 27 which extend downwardly between adjacent runs ofthe web and terminate midway between and closely adjacent a pair 'of lower rollers 22.

.rents of air downwardly through the interspaces formed by the hooked portions 26 of the upper baille set. The upwardly flowing air currents from the lower blower pass between the leg of one lower baffle and one upwardly travelling run of the paper web, thence around the top of this leg and downwardly into the space defined by the opposite face of the leg and another downwardly travelling run of the web. Near the bottom\ of this space the air is exhausted through an outlet port 28a.

The air currents from the upper blower travel a similar but reversed path, passing downwardly on one side of the leg 27 upwardly on the opposite side thereof and outwardly through a port 32.

The air'exhausted from the ports 28a, 32 may, if desired, be partially or completely dried, mixed with a supply of fresh air and recirculated by the blowers which latter may be inside or outside of the housing 10.

The means for heating the drying air may be alocated exteriorly of the drier chamber or may comprise conventional heat generating units of any suitable type located withinthe various bailes and the drier wall, while thatv portion of the web 21 not disposed in paper carrying position is trained over rollers 37, 38 between baiiles' 31 and the drier roofd The upper web 21 leaves the paper web just as the latter reaches the Iirst one of the last pair of rollers 23 and the lower web leavesI the paper just as the latter passes from said last one of the last pair of rollers 23 and is drawn outwardly through the slot 13 by the roller 15.

Obviously many other roller arrangements might be provided for training the portions of the reticulated webs which are not in engagement with the paper. Obviously also the exact arrangement ofthe rollers about which the paper web and carrier webs travel as a unit is .subject to considera-ble variation within the spirit of the invention and the scope of the claims. This is also true of the particular disposition of the various balles, blowers and exhaust ports.

From the foregoing description it will be seen that break is unlikely to occur in the paper web except as the result of a fla-w in the stock or some similar cause and that such breaks do not necessitate stoppage of the drier, sincethe paper is always securely held between the two carrier webs.

The paper leaves the drier in av porous thoroughly dry unmatted condition. The air currents blown with considerable force through a relatively short path, dry the paper effectively and are passed to exhaust before they become sufficiently humidiied to lose their eciency.

since this pressure is substantially balanced at opposite sides ofthe paper except at points where the paper web is b-acked by the hook shaped ends of the deflectors or baiiles. A s.

the webs 2() and 21 are of wire gauze they will not absorb any of the water and will let the air contact directly with the paper through the apertures so that the paper is rapidly dried while being firmly supported.

Having thus described my invention, what II claim as new and desire to secure by Letters Patent is:

1. In a drier for paper making machines, a substantially closed chamber having .an inlet and outlet at opposite ends, rollers for guiding the web in a substantially serpentine path through the'chambers, lower and upper vertical sets of baffles projecting respectively into the U and inverted U loops formed by the adjacent runs of the web and cooperating with said runs to define directing channels for the drying air currents, blower outlets discharging air into the chamber above and below the web, said air passing around each baffle in the direction of thetravel of the web, and exhaust ports through which the air escapes after it has passed over the iurface of substantially a complete paper oop.

2. In a drier for paper .making machines, a substantially closed chamber having an inlet and outlet at opposite ends, rollers for guiding the web in a substantially serpentine path through the chamber, lower and upper vertical sets of baffles projecting respectively into the U and inverted U loops formedby the adjacent runs of the web and cooperating with said runs to define directing channels. for the drying air currents, blower outlets discharging air into the chamber above and below the web, said air passing around each baille in the direction of the travel of the web, and exhaust ports through which the airescapes after it has passed over the surface of' substantially a complete paper loop, -said baiiles each including a hooked end substantially embracing the closed end of each loop and its roller means andbacking such portions of the loops against distortion under air pressure.

3. In a drier for paper making machines, a substantially closed chamber having an .inlet and outlet at opposite ends, rollers for guiding the web in a substantially serpentine path through the chamber, lower and upper vertical sets of baiiles projecting respectively into the U and inverted U loops formed by the adjacent runs of the web and cooperating with said -runstodefine directing channels for thev drying air currents, blower outlets' discharging air into the chamber above and below the web, said air passing around each baille in the direction of the travel of the web, and exhaust ports through which the air escapes after it has passed over the surface of substantially a complete paper loop, said bailles each including a hooked end substantially embracing the closed end of each loop and its roller means and backing such portions of the loops against distortion under air pressure, the closed end of each loop travelling around a pair of spaced rollers and the adjacent runs of the loops between upper and lower roller sets being inclined relatively to each other and to the baille between them.

4. In a drier for paper making machines, a chamber, sets of upper and lower rollers over which the paper web to be dried is trained in a series of alternating U and inverted U bends, a set of upper vertical baille plates pendent into the U bends, a similar series of plates projecting upwardly into the inverted U bends, means for blowing air from opposite sides of the web around the respective bailes in paths delined by the balllesand which the air passes to exhaust after it has passed substantially completely around each baille.

5. In a drier for paper making machines,

series of plates projecting upwardly into the.

inverted U bends, means for blowing air from opposite sides of the web laround the respective baffles in paths defined by the battles and i adjacent runs of the web, and means through its adjacent runs of the web, and means through.-

which the air passes to exhaust after it has passed substantially completely around each battle, the blower inlets being located adjacent the upper and lower corners of the chamber. and additional baille means for d'1-Y recting the air currents from said blower means-into the spaces between the vertical bailles and the runs of the web.

6. In a drier for paper making machines, i a chamber, sets of upper and lower rollers adjacent runs of the web, and means through which the air passes to exhaust after it has passed substantially completely around each baille, each vertical baille including a lateral extension at its outer end closing the space between the baffle' and pone adjacent run of lso the web. v

7. A drier for paper making machines including a pair of endless reticulated carrier websior lconveying' the paper therebetween,

.rollers for guiding the webs in -a' substantially serpentine path lforming U loops, the carrier webs serving to support the paper from both -sides during its travel along the sides of said loops from one set of rollers to the other, a baille projecting into each loop and'having an air inlet and an air outlet upon opposite sides adjacent to one end, whereby an air passage is formed within. the loop along opposite sides. of the baffle, and means for delivering air through the passages to said loops in parallel. Y

8. A drier for paper making machines including a pair of endless reticulated carrier rollers for guiding the webs in a substantially serpentine path forming U-loops, the carrier webs serving to support the paper from both sides during its travel along the sldes of said loo s from one set of rollers to the other, a bae projecting into each loop and forming therewith a separate air passage 1n each loop along opposite sides of said baille, means for delivering a separate air current to 'each such passage adjacent to one end thereof, and means for exhausting the air at the opposite end of the passage whereby the web is dried from opposite sides by evaporation of the moisture through the wire mesh.

Signed at Bridgeport, in the county of Fairlield and State of Connecticut, this 27 th day of June, A. D. 1928.

HARRY E. HOLCOMB.

websfor conveying the paper therebetween,

rollers for guiding the webs in a substantially serpentine path forming U loops, the

carrier webs serving to support the paper from both sides during its travel along the sidesof said loops from one set of rollers Ato the other, a baiile projecting;l into each loop and having an air inlet and an air outlet upon opposite sides adjacent to one end, whereby an air passage is formed within the loop along opposite sides of the baiiie, and

-anv air supply conduit connected to each of said inlets for delivering air through said passages.

' 9. A drier for paper making machines including a pair of endless reticulated carrier webs for conveying lthe paper therebetween, rollers for guiding the webs in a substantially serpentine path forming U loops, the carrier webs serving to support the paper from both sides during its travel along the sides of said loops from one set of rollers to the other, a baille projecting into each loop and having an air inlet and an air outlet upon opposite sides adjacent to one end, said end having a portion closely adjacent to one of said webs to prevent flow of air therebetween, and the other end of the baille being spaced from said web to permit the passage of air around the end of the baille.

10. A drier for paper making machines, in,

'cluding sets of spaced rollers, a pair of carrier webs for conveying the paper back and forth in a serpentine path between said sets A of rollers and forming U loops, and bales projecting into said loops, the outer end of each baffle being disposed closely adjacent to the web to substantially prevent air passage between the baille and web andthe opposite end terminating within-the loop and spaced from the web, and an air inlet to each loop between the baffle and web adjacent to the first mentioned end of the balile.

11: A drier for paper making machines including a pair of endless wire gauze carrier webs for conveying the paper therebetween,

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