US1232141A

US1232141A - Method of and means for drying paper.

Info

Publication number: US1232141A
Application number: US3114315A
Authority: US
Inventors: Ambrose H White
Original assignee: International Paper Co
Current assignee: International Paper Co
Priority date: 1915-05-29
Filing date: 1915-05-29
Publication date: 1917-07-03
Anticipated expiration: 1934-07-03

Description

i A. H. WHITE.

METHOD OF AND MEANS FOR DRYING PAPER.

APPLICATION FILED MAY 29,1915.

1,23%, M1 Patented July 3, 1917.

3 SHEETS-SHEET I.

QQ 7 M A H. WHITE.

METHOD OF AND MEANS FOR DRYING PAPER.

APPLICATION FILED MAY 2911915.

1,262, 141 Patente d July 3, 1917.

3 SHEETS'SHEET 2.

5 n we w toz A. H. WHITE.

METHOD OF AND MEANS FOR DRYING PAPER.

APPLICATION FILED MAY 29,1915. 1,Q3Q,141 Patented July 3,1917.

3 SHEETS-SHEET 3.

$513 (lite Mama UNITED STATES. PATENT orrron.) A I AMBROSE H.WHITE,

COMPANY, A CORPORATION OF NEW YORK.

METHOD OF AND MEANS FORDRYING PAPER.

Application filedllay 29, 1915. Serial No. 31,143.

ing of the paper web in itspassage through the drying part of paper making machine,

which part of the machine consists usually of a number of hollow internally heated drying cylinders disposed in two series, one above the other, and arranged to receive the damp web from the wet end of the aper making machine, and over and around which cylinders the web travels and is subjected to a drying action, the web being supported in its travel by means of bands or aprons known as drier felts. The disposition and arrangement of these parts is such that pockets will be formed between the adjacent cylinders of one series and the opposed cylinder of the other series, the sides of which pockets are formed by the traveling web as it passes cylinders to the next around the opposed cylinder. In the drying action of the cylinders on the web, the heat of the cylinders expels the moisture, and various expedients have been resorted to to pelled moisture, as its presence in the room is very objectionable for many reasons, mainly because of its reabsorption by thepaperweb, its deposit on the machine, the intense heat created in the room, and the deposit of the moisture on the roof plankin and other parts of the room. These con itions, more particularly the absorption of the moisture by the web, greatly retard the drying of the paper. As far as I am aware, however, such expedients have not, in practice, proved en tirely satisfactory.

My invention aims to overcome the objections mentioned and it consists of an im-.

roved method of expediting and facilitat-v mg the drying of the paper, by subjecting the same to the action of a blast of air, applied in thepocket between adjacent drying cylinders, whereby the air will absorb moisture from the web, and then abstracting the Specification of Letters Patent.

Methods of and of which the fol-' from one of the adjacent get rid of this ex Patented Jul 3, 19m.

moisture-laden air from the pocket by a suctlon action operated in said pocket.

My invention consists also of means for carrying said method into efiect, said means consisting of the combination with adjacent cylinders, over and around which the paper web is adapted to travel, thereby forming a CF BROOKLYN, NEW YORK, ASSIGNOR T0 INTERNATIONAL PAPER pocket between the cylinders, of blast means 1 located in said pocket and acting to deliver a blast of air therein so that the air will absorb moisture from the web, and a suction means also located in said pocketand acting to exhaust the moisture laden air therefrom. I I prefer, as illustrated in the accompanymg drawings, to employ a blast means in the form of a pipe extending longitudinally of the, cylinders and having openings, through which the blast willbe delivered in a direction contrary to the travel of the paper from one cylinder, and to employ a suction means of like form extending longitudinally of thecylinders with the openings in the pipe disposed to draw the moistureladen air from the pocket in a direction contrary to the travel of the paper web to the next cylinder. r

' It will be manifest, however, to the skilled mechanic, that the details of the apparatus may be variously changed and modified without departing from the limits of my invention, rovided the operation is substantially as indicated above, and further it will be understood that my invention is not limited to any particular form of construction of the parts nor as to the method of procedure except in so far as such limitations are specified in the claims.

In the accompanying drawings:

Figure 1 is a side elevation of the drying partof a paper making machine provided with means for carrying my improved method into effect. I

Fig. 2 is a dia rammatic view of the, same on a reduced sca e, the frame-structure and certain other parts being omitted to better illustrate the operation of my invention.

Fi 3 is 'a top plan view of the system of distributing and return pipes employed for introducing the dry air and abstracting the moisture laden air. a

Fig. 4 is a view on an enlarged scale to better illustrate the method involved.

Referrin to the drawings:

'Fig. l ilustrates the drying part of a paper making machine which part consists,

as usual, of an upper series of drying cylinders 1, P, 1*, etc., and a lower series of dry ing cylinders 2, 2, 2*, etc, which cylinders are internally heated and are mounted for cylinders by means of a drier felt in the form of an endless band or apron 4 passing around the upper cylinders and around guide rollers 5 between the cylinders, and the said web being supported against the lower cylinders by means of drier felt in the form of an endless band or apron 6, passing around the lower cylinders and guided around rollers 7 between said cylinders. As thus disposed, pockets will be formed between the two series of cylinders, the alternating pockets 8 being closed at their lower ends by the lower cylinders and at their upper ends by the upper drier felt, and the intermediate pockets 8 being closed at their upper ends by the upper cylinders and at their lower ends by the lower drier felt, the sides of the pockets being formed by the paper web where the latter extends from the cylinders of one series to those of the other series. The above described mechanism is one commonly employed to subject the damp paper web to a drying action, and the cylinders being rotated in the direction of the arrows, the web will travel back and forth around and between the cylinders of the two series, said web passing downwardly from the inner side of one of two adjacent cylinders of the upper series, then around opposing cylinder of the lower series, and up around the inner side of the other adjacent cylinder of the upper series, the heat of the cylinders acting to expel the moisture from the damp web, which escapes in form of vapor or steam.

In carrying my improved method into effect in connection with an apparatus of this form, I introduce into the pockets, as shown more particularly in Fig. 4, by a suitable blast means 9, a blast of air which issues in a direction opposite the travel of the paper from the cylinder 1, the blast being preferably directed toward the contracting space between the web and the adjacent side of the drier felt. The air thus delivered under pressure will absorb mois-' ture from-the damp web, and by impinging against the web and felt, will be deflected and will flow in a stream or eddy laterally toward the opposite stretch of the Web, where the latter passes onto the next cylinder 1. At this point, and in accordance with my method, the moisture-laden air is instantly abstracted by a suction action operating through a suction means 10 which draws in the air, as indicated by the arrow in a direction opposite the travel of the web onto the cylinder 1, and generally away from the contracted space between the drier felt and the web at that side. The effect of this method of procedure is to supply to the pocket a quantity of air, which, after acting .on the damp web and absorbing the moisture therefrom, is instantly exhausted from the pocket. As a result, the moisture of the air is revented from being reabsorbed by the we or being deposited in the machine or room, the temperature of the room will be ing action of the cylinders on the web will be made more efficient, and the drying of the paper greatly expedited. By reason of the fact that the blast of air and the suction of the moisture-laden air act in directions contrary to the travel of the paper, there will be little or no liability of the moisture being deposited or entrapped in the gradually contracting spaces between the two stretches of the web and the intermediate drier felt.

In the form of apparatus shown, the blast and suction means are in the form of perforated pipes, as illustrated more particularly in Fig. 3, which pipes are extended into the pockets, respectively at opposite sides of the same, and longitudinally of the cylinders, the perforations in the two pipes facing, respectively, the spaces between the web and opposite sides of the drier felt, so that the blast will be directed into the space at one side opposite the travel of the paper at this side, and the suction will be drawn from the space at the opposite side in a direction opposite the travel of the paper at that side. The several blast pipes 9 are connected at their ends to branch pipes 9 extending upwardly and connected at their upper ends to horizontal supply pipes 9",

.which, in turn, connect with a mam supply pipe 9 leading to the force side of a blower or fan 12. The suction pipes 10 are connected at their ends to branch pipes 10 1eading upwardly and connected to a horizontal supply pipe 10 connected, in turn, to a main supply pipe 10 leading to a trunk 13, which latter is connected to the suction side of the fan, an air washer 14 and an air heater 15 being arranged in. said trunk. By these means, the moisture laden air drawn from the pockets, is subjected to a washing and drying action, and is returned in" d condition to the pockets through the blast pipes,'the air being thus continuously circulated through the pockets.

Instead of the blast and suction means operating in alternate pockets 8 closed at their upper ends by the upper drier felt, it will be manifest that these means may op- 80 prevented from rising unduly, and the dry? crate in the intermediate pockets closed at their lower ends by the lower felt as shown by dotted lines to the left in Fig. 2, or they may be applied to operate in both sets of pockets, or in certain pockets of one set and in certain pockets of the other set, provided that the operation and method of procedure will be substantially as above set forth. Further it will be manifest that instead of directing the blast toward and operating the suction in a direction from, the spaces between the opposite sides of the Web andthe intermediate drier felt at one end of the pocket, they may be applied to operate at the opposite end of the pocket, between the respective stretches of the web and the ad j acent surfaces of the drying cylinders.

Having thus described my invention, what I claim is:

1. The method of expediting the drying of paper in paper drying machines employing drying cylinders, around which the paper web passes and forms pockets between the cylinders which consists in subjecting the side of the paper, at a point in the pocket where it passes from the drying cylinder, to

a blast of air acting in a direction contrary to the travel of the paper, whereby the moisture of the paper will be absorbed by the air, and abstracting said moisture-laden air by subjecting the same side of the paper but at a different point in its length, to a suction action operating in the pocket in a direction contrary to the travel of the paper.

2. The method of expediting the drying of paper in paper drying machines employing drying cylinders, and "in which the paper web passes in the loop from one cylinder to another adjacent cylinder around an intermediate opposed cylinder, which method consists in directing a blast of air against the side of the web where the web passes from one cylinder at the beginning of the loop,

whereby the air will become moisture-laden and will be caused to flow laterally toward the cylinder, onto which the web passes after completing the loop and abstracting said moisture-laden air by a suction action operating adjacent the said last named cylinder.

3. The method of expediting the drying of paper in paper making machines employing drying cylinders, and in which the paper web passes in a loop from one cylinder to another adjacent cylinder around an intermediate opposed cylinder and is pressed against said cylinders by an apron or band, which method consists in directing a blast of air in the space between the web and apron at the point where the web leaves one cylinder, at the beginning of the loop and in a,

direction contrary to the travel of the web, whereby the air will become moisture-laden and Wlll flow toward the cylinder, onto which the web passes after completing the loop and abstracting said moisture-laden air by a suction action operating between the web and apron at a point where the Web passes to the said last named cyllnder and in a direction contrary to the travel of the web.

4. In an apparatus for drying paper, the combination with upper and lower seriesof drying cylinders between and around which the paper web is adapted to travel, thereby forming a pocket between adjacent cylinders of one series and an opposed cylinder of an other series, of a blast means located in said pocket at one side to supply air thereto, whereby the air will absorb moisture from the web, and a suction means located in said pocket at its other side, to abstract the moisture-laden air.

.6. In an apparatus for drying paper, the combination with upper and lower series of drying cylinders between and around which the paper web is adapted to travel, thereby forming a pocket between adjacent cylinders of one series and an opposed cylinder of the other series, of a blast means located in said pocket acting to deliver a blast of air, whereby the air willabsorb the moisture from the web, and suction means also located in said pocket and acting to abstractzthe moistureladen air therefrom. 7. In an apparatus for drying paper, the combination with upper and lower series of drying cylindersbetween and around which the paper web is adapted to travel, thereby forming a pocket between adj acent cylinders of one series and an opposed cylinder of the other series, a blast means located in said pocket and acting to deliver a blast of air adjacent one cylinder in a direction opposite the travel of the paper web from said cylinder, whereby the air will absorb moisture from the web, and a suction means also located in said pocket and acting to abstract the moisture-laden air adjacent the other cylinder and in a direction opposite the travel of the web thereto.

8. In an apparatus for drying paper, the combination of adjacent drying cylinders over and around which the paper web is adapted to travel, thereby forming a pocket between the cylinders, blast means located in said pocket and acting to deliver a blast ture from the Web, and a suctionriineans also located in said pocket and acting to exhaust the moisture-laden air in a direction opposite the travel of the paper. a

9. In a machine for drying paper, the

5 combination of adjacent drying cylinders over and around which the paper Web is adapted to travel, thereby forming a pocket between the cylinders, and an apron or band to press the web against the cylinder, said apron or band being spaced from the web inders and in a direction opposite the travel of the web from said cylinder, whereby the air will absorb moisture from the web, and suction means located in said pocket and acting to exhaust the moisture-laden air from the space between the web and apron adjacent the other cylinder and in direction opposite the travel of the web to said latter cylinder.

10. In a paper drying machine, the com- 25 bination of adjacent drying cylinders over and around which the paper web is adapted to travel, thereby forming a pocket between the cylinders, a blast pipe extending within said pocket longitudinally, of the cylinders and acting to deliver a blast of air therein,

whereby the said air will absorb moisture from the Web, and a suction pipe also extending within said pocket longitudinally of the cylinders and acting to exhaust the moisture-laden air therefrom;

11. In a paper drying mechanism the combination with upper and lower series of drying cylinders over and around which the paper web is adapted to travel, thereby forming a pocket between the cylinders, and an apron or band acting to press the web against the cylinders and closing the upper end of said pocket, a blast means located in said pocket and acting to deliver a blast of air into the same, whereby the air will ab-- sorb moisture from the Web, and a suction means also located in said pocket and acting to abstract the moisture-laden air therefrom.

12. In a paper drying mechanism the combination of adjacent drying cylinders over and around which the paper web is adapted to travel, and a band or apron to press the web against the cylinders, said parts being disposed to form a pocket be tween the cylinder closed at its upper end, a blast means located in said pocket and acting to deliver a blast of air therein, whereby the air will absorb moisture from the web, and a suction device also located in said pocket and acting to abstract the moisture-laden air therefrom.

signature.

In testimony whereof, I have afiixed my.