US1493536A - Method of and apparatus for removing moisture from paper stock - Google Patents

Description

May 13 1924. 1,493,536

A. J. HAUG METHOD OF AND APPARATUS FOR REMOVING MOISTURE FROM PAPER STOCK Filed Oct. 19. v1921 2 Sheets-Sheet 1 17122971270? B72507? JHa/u May 13 1924. 1,493,536

A. J. HAUG METHOD OF AND APPARATUS FOR REMOVING MOISTURE FROM PAPER STOCK Filed Qct. 19 1921 2 Sheets-Sheet 2 lave-W770i.-

Patented May 13, 1924.

UNITED. STATES PATENT OFFICE.

ANTON J. HAUG, 0F NASHUA, HAMPSHIRE, ASSIGNOR TO IMPROVED PAPER MACHINERY COMPANY, OF NASHUA, NEW HAMPSHIRE, A CORPORATION OF MAINE.

METHOD OF AND APPARATUS FOR REMOVING MOISTURE FROM PAPER STOCK.

Application filed October 19, 1921. Serial No. 508,653.

a specification, like characters on the drawiugs representing like parts.

This invention relates to methods of and apparatus for removing moisture from paper stock and consists in improvements which simplify the extraction of moisture from the pulp, whether the consistency of the latter is relatively thick or relatively.

thin, and which permit the extraction of any required amount of moisture from the stock. It also consists in improvements whereby, without the use of felt, a web or fibre layer canbe formed from stock where the fibres are held in liquid. suspension.

The invention will be best understood by reference to the following description when taken in connection with the accompanying illustration of one specific embodiment of the apparatus, while its scope will be more particularly pointed out in the appended claims.

In the drawin Fig. 1 is a Si elevation of an apparatus embodying one form of the invention;

Fig. 2 is a transverse cross-sectional elevation, diagrammatical in character, showing the relation of the expressing rolls in the apparatus of Fig. 1; and

Fig. 3 is a similar cross-sectional elevation showing a modified form of apparatus.

Referring to the drawings and more particularly to Figs. 1 and 2, the stock from which the moisture is to be removed is delivered to the upper surface of a hollow, perforated cylinder 5, which is driven from any suitable source of power in the direction of the arrow shown in F ig. 2. If the object is merely to extract moisture the stock may be applied from above to the upper surface of the cylinder in any desired way, as by providing a compartment or chamber to which the stock is delivered and of which the cylinderfi and the cooperating couch or ex ressing roll 7 form the bottom. If it is esired to form a web or sheet, however, the stock is preferably applied from above by deliver-mg to the upper surface of the cylinder a measured, uniform stream capable of forming an even, uniform sheet on the foraminous surface of the cylinder as the latter revolves. In the apparatus illustrated in Figs. 1 and 2, there is provided for this purpose a stock supply chamber 9 fed from the feed pipe 11 having a baffle plate 13, the stock passing out under the baffle plate and over the weir plate 15, the height of latter and the rate of feed through the pipe bein adjusted to give sheet of the require thic ness. The cylinder 5 has a foraminous surface and may be of the general construction commonly utilized in cylinder molds, permitting ready drainage to its interior of the surplus or free moisture contained in the stock. The water passing to the interior of the cylinder passes to the bottom of the interior thereof and thence through the perforations therein into the drip pan 17 or other receptacle, whence it escapes through any suitable waste pipe 19.

Cooperating with the foraminous cylinder 5 is the expressing roll 7 adapted to be pressed relatively toward the cylinder and express water from the stock as the latter passes between the perforated roll and the expressing roll, such expressed water also passing to the interior of the hollowcylinder and to the drip pan 17.

Any suitable means may be employed for exerting the necessary ressure between the rolls, but herein the roll 7 is mounted in stationary journals 21, while the roll 5 is mounted at each end in journals 23, the latter being adapted to slide horizontally on guideways 25 supported on the main frame 27 and the necessary pressure between the two rolls being maintained by the coiled spring 29, the compression of which may be adjusted through the hand-wheel 31.

The perforated cylinder which receives the stock in the first instance should preferably be constructed with an open mesh so as to permit the free passage of the surplus water through its walls, and such a form of cylinder is usually incapable of withstanding excessive pressure. A relatively moderate pressure therefore onl is maintained between the expressin r01 7 and the perforated cylinder 5, ea sequent expressing action or actions being relied upon to further extract moisture as ma be required. The expressing roll 7 whic is unperforated is preferably covered with felt or other soft, yielding material like the usual couch roll in order to best cooperate with the perforated roll 5.

As the web of moist stock passes down between the two rolls, the expressing roll 7 presses it firmly against the perforated surface causing further surplus water therein to. pass through the perforations of the cylinder, whence it gravitates through the bottom of the perforated cylinder and into the drip pan 17. The sheet thus formed, as it passes the point of contact between the two rolls, leaves the erforated roll and clings to the couch roll 7, because of the 7 superior adhesive attraction offered by the felt or other surface of the couch roll.

It will be observed that the water which is thus expressed through the perforations in the roll 5 not only gravitates in such a direction as to have no contact with the thickened stock, but in draining throu h the perforations in the lower half of t e perforated cylinder tends to wash these fperforations free from the accumulated bre and maintain the roll clean and effective for the draining action.

Then stock having been preliminarily drained, is next subjected to a more vigorous expressing action by being subjected to a second pair of rolls, comprising also a perforated cylin ler and an expressing roll, these, however, being so constructed as to be capable of exerting a relatively greater pressing action and therefore extracting a substantial amount of the remnant moisture. For this purpose there is provided a second cylinder 33 having a perforated surface adapted to cooperate with an expressing roll 35, the latter however preferably havin a smooth, hard,.,nnperforated surface, by means of whici if', a relatively great pressure can be exerted against the perforated roll. In the a paratus shown in Figs. 1 and 2, the web is transferred from the couch or expressing roll 7 to the perforated cylinder 33 by direct contact, the cylinder 33 being constructed to provide a greater adhesive attraction for the web than the couch roll. For this urpose the cylinder 33 is mounted at eac end in bearings 37 sup rted by the'arm 39 pivoted at 41 to the rame 27. The opposite end of each arm 39 is attached to the link 43 which in turn is jointed to a long wei hted arm 45 pivoted at! 47 on the base 49 o the machine. The weights 51, which may be adjusted to any required amount, maintain a constant upward pressure on the perforated roll or cylinder 33 against the couch roll 7, so that the stock delivered by the roll 7 is not only subjected to pressure between the cylinder 33 and the roll 35 but is also subjected to pressure between the cylinder 33 and the roll 7. The stock or web after its delivery to the cylinder 33 passes between the cylinder and the expressing roll 35 and is thereby deprived of further moisture which, like the moisture expressed by the roll 7, drains down into the lower part of the cylinder 33, thence through the perforations in the bottom thereof and 1nto the drip pan or drainage receptacle 53, whence it is withdrawn through the waste pipe 55.

To exert the necessary pressure between the cylinder 33 and the expressing roll 35, the latter is mounted at each end in adjustable bearings 57 slidable horizontally in ways 59 and forced toward the cylinder 33 by relatively heavy springs 61, the pressure of which may be adjusted by the handwheel 63 ada ted to turn a suitable adjusting screw. e hard, smooth surface of the presser roll 35 acts not only to expel the water from the stock through the perforations in the roll 9, but also to expel air from between the stock and the smooth surface of the roll, so that the fibres tend to cling to the latter rather than to adhere to the perforated surface. The dried fibres, therefore, as they pass the point of contact between the two rolls, leave the perforated cylinder and cling to the smooth roll.

In order to withstand the relatively great pressure exerted by the presser roll the perforated cylinder is preferably constructed not only with a foraminous covering, but also of suflicient strength to withstand considerable surface pressure, a construction pf this kind, by way of example, being shown in my co-pending a plication, Serial No. 255,445, filed Septem r 24, 1918, wherein the cylinder is covered with perforated sheet metal, provided with openings which are of lesser diameter than the average length of fibres or slivers to be handled, but reinforced at intervals by radial supports .which are carried by a series of spiders, thereby materially stiffening the surface against external pressure. This construction also provides the necessary adhesive construction to cause the web to pass from the couch roll 7 to the cylinder 33, the pressure between the two rolls ex elling the excess water which escapes free y through the perforations of the cylinder and causes the fibres to cling to the perforated surface of the latter.

The web having passed from the perforated eylinder 33 to the roll 35 is then withdrawn from the smooth roll by any suitable means, as by a doctor blade 65, and may be carried to any other desired apparatus in theform of a continuous traveling sheet or may be withdrawn and stored for future use.

The expressing action which is carried out by the pair of expressing rolls 33 and 35 may be repeated in subsequent stages and, by subjecting the sheet to the action of successive pairs of expressing rolls, the extraction of water may be carried on gradually and with the greatest thoroughness. In Fig. 3 I have shown an ap aratus similar to that illustrated in Fig. 2, ut with the addition of other pairs of expressing rolls which act to further extract moisture from the stock. In Fig. 3 the web, instead of being removed from the expressin roll 35 by a doctor blade, is transferre as before, directly to the perforated cylinder 67 similar in construction to thecylinder 33, and is subjected to the ressure of the coo rating ex pressing r01 69 generally similar in construction to the expressing roll 35. This transference of the web from one set of expressing rolls to a succeeding set may be carried out through as many stages as deshed, the rforated roll of one set receiving the we directly from the expressing roll of the preceding set either by direct contact therewith or otherwise. n Fig. 3 an additional set of expressing rolls are provided, bein embodied in the perforated cylinder 71, a so similar to the cylinder 33, and the cooperating expressing roll 73 generally similar to the roll 35, the web being received by the cylinder 71 directly from the expressin roll 69 but with the assistance of the doctor blade 75 which diverts the web from the expressing roll and allows it to pass downward to the perforated cylinder 71 and between the latter and the ex ressing roll 73. From the roll 73 the web is cleared :y the doctor blade 75 and may be deliver as before, to any desired apparatus or recegtacle.

he surface of the expressing - r'olls 35, 69, etc., which is necessa to cause the fibres to cling to the surface 0 the roll and leave the perforated roll, will depend somewhat on the degree to which moisture has already been extracted from the web. The further the process continues the smoother and harder should be the surface of the roll so as to be more effective in expelling the water between the surface of the roll and the web. Thus, the surface of the first roll 35 should be preferably smooth but not necessarily polished, while the surface of the roll 69 should preferably have a higher finish, and as the successive stages are passed through successive rolls should have a higher polish and should preferably be used under increasin ressure.

Whi e have herein shown for the purpose of illustration one s cific embodiment of the invention, it is to understood that the same is not limited to specific details herein shown nor to the form or relative arrangement of parts, but that extensive deviations may be made therefrom without departing from the spirit thereof.

Claims:

1. The process of extracting moisture from Paper stock which consists in applying the stock from above to a foraminous cylindrical surface, withdrawing surplus moisture by gravity through the walls of the cylinder, transferring the stock from the cylinder to a couch'roll and therefrom to a second foraminous cylinder, the latter capable of withstanding relatively greater pressure, and subjecting it thereafter to the relatively greater pressure of a cooperating expressing roll.

2. The process of extracting moisture from paper stock which consists in applying the stock from above to a foraminous cylindrical surface, withdrawing surplus moisture by gravity through the walls ofthe cylinder, subjecting the drained stock to the pressure of a cooperating roll, and thereafter causing it to travel upon the surface of a second foraminous cylinder and subjecting it to further and greater pressure to extract further moisture.

3. The process offorming a web from paper stock which consists in dropping a uniform stream of stock on a foraminous cylindrical surface, Withdrawing surplus moisture by gravity through the walls of the cylinder, subjecting it to the pressure of a couch roll, transferring the sheet to a second perforated cylinder capable of withstanding considerable pressure, and subjecting the sheet thereon to relatively greater pressure by the action of a second expressing roll.

4. The process of formin a web from paper stock which consists in dropping a uniform measured stream of stock on a foraminous cylindrical surface, withdrawing surplus moisture by gravity through the walls of the cylinder, and sub'ecting the sheettoa plurality of expressing actions while in direct contact with a foraminous surface to extract further moisture.

5. The process of extracting moisture from paper stock which: consists in apply- ,ing it from above to a foraminous cylindrical surface, withdrawing surplus moisture by gravity through the walls of the cylinder, subjecting it to the action of an expressing roll, and thereafter subjecting it to further squeezing action while in direct contact with the squeezing agencies.

6. The process of forming a web from paper stock which consists in dropping a uniform measured stream of stock on a foraminous cylindrical surface, subjecting the sheet to the pressure of a cooperating roll, conveying the sheet to a second perfoto the dpressure of a cooperating pressure roll an thereafter causing it to travel between and in direct contact'with the surfaces of one or more pair of lesser rolls.

T recess f forming a web f m P r t k which on t n s arri a m 'm me u ed t m f 81 991 on a foraminmis yl nd i al irfa efivi hdrew u pl m i ture y ravity threes the P ur f a oo erating mu, fran em." it by (1i ect contact t 5! $9. 9!}: an l l i tins t there n retire we of a secont cxpressi g roll.

The Pr 9 f rming t ask tram paper s k hi l eas st's'iafl time unifo m stream a stock one tapas yfiedriral ame, withdrawing s; m ses ma Flemish the a h elea e" s ens" is was the b es!! e the ali e a ea m th m e was a? see a ms Pe pers; 19- Te mess of sme rs. masters s nausea from stark v cl yea' is pressing the same toward the cylinder with a relatively gentle ressure,ia second foramiy ierr to rea ive t a smo th exp sing tell a, head t ard aid n ymdem agra ian i remove h tock 1 1 51 amnesi ran, a th rd pa n prim e eive tie Sta k remov d h lest-9, l? g and a BP mg roll 0- rr e as was r a $39 839 #2 far in a We 9? are" leek earns a he deals alias s users d sagree mages, a ste l tree a a ea tr sharia t an a W?! is area! we? $2!!! lee master;

#1 r ya Martians a Mela a (as ai l a ash rea h mil a emails? w as ashes taxed as Mad a was a was erfe ra regenerates-is, c

ea s erra a5 tell engaging th she t as Makes.-

as enes was? is s ster e in s f a {area-areas she t r an 9 an is! i 11 it c t sing a was? fa a a! a d asse sin wa er thereat, wes erns st the ars 2% 9?? 1??? a fa'eaz e as h th lssre terk is 9 se s L PtFWgFs, a as; e new ta {Papas a measured c been an? ex re ses far a teasers streams as Fran a salts are a t enema ta {an a as; swear-ea are are r 11- ,In an appar tus t r a e an is at ta e- F a t ea Assn rats? wa n from me ne the 99m 42% 39' an a k, may 1 is. yes a se the she t the ylmd r the t ck S p y a est era'isds is a l see a Sti es ewm us rop t e sto k n the cvjiaifl, elev n lliiisy is resin th heet from o l I se med p ioreted Glands? Beard a a ing r ll '5 2- In a a er nwk ng apparatus fa li moving the um fr m napr'rst i are 99min t er with s pe f r ted ylipderof nsane f r as lyin i m s a k f th ti ings? m a a e a o perating mu, said cyliii a: l i g $9 ements rat the ntatioube-twese this of ew -E! tram w u h W ter i lis s lirsseii; the rplf ml yl hd r being Pr s d ter wd Q 9 e her to apes at r from th s o k an; caus it to pass thl h he pe reti h'sin he Su a e; a secon perforated cylinder adapted to re ceive the stock, and a cooperating pressure roll related to said second cylinder.

13. In a machine for forming a web of paper stock the combination with a fol-aminous cylinder of means for dropping a measured stream of stock from above on the cylinder to form a web, a couch roll, means for K, ecliine er 4? Ifssins moi ture are {iii risk; a for name eager, mean-S ar anew-es at t. t h was a i em were as a a ime re um I i t feast? spa e Walls, era; re ea-"agein e r f" e ini sr an a era: is h thwk a fa k their a e a eam, smmiamis fcl liner in ece pt will! he s on o. e pressing rd to take the stock therefrom, and a second expressing rollengagingthe stock on saidsecqnd cylinder.

18. In a machine for extracting moisture from paper stock, the combination with a foramlnous cylinder of means for appl ing the stock thereto from above, means to rain away surplus moisture through the cylinder walls, a roll subjecting the stock on the cylinder to an expressin action, and means to withdraw the stock romthe roll to the surface of a second foraminous cylinder and subject it to a relatively greater pressure for extracting further moisture therefrom.

19. In a web forming machine for paper stock, the ,combination with a foraminous cylinder of a couch roll, means for dropping a measured stream of stock from above on the cylinder to form a web, and means to receive the web from the couch roll and express further moisture therefrom, the same comprising a second perforated cylinder capable of withstanding greater pressure than the first cylinder, and a smooth expressing roll pressed into cooperative relation to the second cylinder.

20. In a machine for extracting moisture from paper stock, the combination of a foraminous cylinder and co-operating exressing roll, a doctor blade to remove stock groin said roll, a second foraminous cylinder to receivethe stock removed by said doctor blade, and anexpressing roll cooperating with said second cylinder.

21. In a web forming machine for paper stock, the combination with a foraminous cylinder of means for dropping a measured stream of stock from above on the cylinder to form a web, means to drain away the sur plus moisture through the cylinder walls,

and means for pressing the sheet against the cylinder to express further moisture therefrom.

22. In a web forming machine for paper stock, the combination with a foraminous cylinder of a couch roll, means for dropping a measured stream of stock from above on the cylinder to form a web, and means to receive the web-from the couch roll and express further moisture therefrom, comprising a second perforated cylinder and an expressroll co-operating therewith.

in v

In testimony whereof, I have signed my name to this specification,

ANTON J HAUG.

Images