claiined a cylinder type of:paper making machine In which a pickup felt emoves the flbrous mats from the cylinder mol@ds, carries the'mats through a water extracting device according to this invention and irnmediately thereafter transfers the so formed fibrous web to another felt or carrier befo-re the web can reabsorb moisture from the pick-up felt. 10 In my copending application entitled "Cylinder paper machine and process of making paper", Serial No. 26,181, Med June 12, 1935, I have described and claimed a cylinder type of paper making machine having the pick-up felt travel15 ling over the cylinder molds to remove the flbrous mats therefrom and carry the mats through a water extracting device according to this invention to form a flbrous web therefrom. The direction of travel of the web Is reversed after pas20 sage through the water extracting device and the web is carried by another felt or carrier with the pick-up felt side of the web exposed. It is therefore an object of this invention to provide a water removing device for cylinder 25 formed webs which dispenses with the heretofore necessary primary presses, extractor rolls and the like, normally used on this type of paper macliines. Another object of this invention is to provide 30 a water extracting device including a suction drum and co-operating press roll for removing water from the pickup felt and fibrous web formed on cylinder type paper machines. A further object of this invention is to pr(>vide 35 a suction-roll with holes of a sufficiently small size and so closely spaced that a cylinder formed fibrous web may be subjected thereon, without damage, to suction of a high degree.' A further object of this invention is to pro40 vide a process for removing water from cylinder formed fibrous webs without the aid of prirnary presses and extractor rolls. A further object of this invention is to provide a process for removing water fiom neWlY 45 formed wet flbrous webs by suction and subsequent pressure on the suction device. Other and further objects of this invention wiR be apparent from the following detailed description of the annexed sheets of drawings 50 which disclose a preferred embodiment of the invention. On the drawings: Figure 1 is a fragmentary elevational view with parts in vertical cross section of a cylinder type 55 paper macliine showing the last cylinder mold and the water removing device of this invention. Figure 2 is an enlarged plan view of the Outside periphery of the suction roll drum used in this invention fllustrating the manner in which 60 the roll is perforated. F@gure 3 is a vertical cross sectional view of the suction roll drum showing the holes drilled therethrough. Figure 4 Is a broken elevational view with 65 parts in vertical cross section of an alternative form of cylinder type paper machine embodying the water removing device of this invention and illu@trating the manner in which a top felt maY be used on the machine if desired. 70 Figure 5 is an enlarged fragmentary cross seetional vlew of a suction 8hee. As shown on the drawings: In Flgures 1 And 4, the reference numeral IC designates cylinder molds of the conventional 75 type rotating in vats II containing the paper stock. A pickup felt 12 is directed over the top of the cylinder molds I 0 and is pressed against the periphery of the cylinder molds by coucher rolls 13 of the conventional type. The fibrous web formed on the eyhnder molds I 0 is thiis 5 transferred to the pickup felt' 12 Which travels toward the rear of the machine as Indicated and around a roll 14. The water extracting device of this Invention is mounted above the roll 14 between the verti- 10 cal legs 15 and 16 of a frame structure. The water removing device comprises a suction roll 17 and a co-operating press roll IS. The suction roll 17 is mounted at its ends in bearings I 9 and is connected through a hollow trunnion 20 lo- 15 cated in one or both ends of the roll to a drain pipe 21 which is connected with a suction pump (not shown). A suction box 22 is mounted within the roll 17 and carried by the trunnion 20. The suction box 22 is provided with a floating 20 head 22a which rubs or bears against the inner periphery of this roll to define a suction area indicated generally at A. The suction roll may be of any suitable construction known to the art such as the roll described in my United States 25 Patent No. 1,679,598. However, in the present installation, the floating head 22a deflnes a larger suction area than is customary in suction rolls. Furthermore, the holes 23 (Figs. 2 and 3) drilled through the roll 17 are of smaller diam- 30 eter and are spaced closer together than in the customary suction roll. The holes 23 are countersunk for about an eighth of an inch as shown at 24. VIhereas the holes of the customary suction roll average about 1% of an inch in 35 diameter'and are countersunk on the surface to provide openings of 1/2 inch to % inch in diameter, the holes of the suction roll used in this Invention are reduced to a diameter of about ??z to 1/4 inch with the largest digmeter of' the 40 countersunk portion being about A to A inch. The holes are arranged so as to provide a rninimum of solid surface on the roll. Because the holes are small and are close together, the countersinks 24 can be very gradual to eliminate 411 the vortex draining effect produced by larger holes, spared further apart and provided with flat countersinks to reduce the "land" area between the holes which reduces the resistance to drainage. As shown in Mg. 2, the holes are arranged In horizontal rows extending axially across the roll and the rows are staggered so that the center of a hole in one row Is positioned at a point mid-way between the holes in an adjacent row.65 When holes having a diamter of A inch are drilled In the suction drum, the centers of the holes in each row are spaced about .28 Inch apart while the centers of the adjacent rows are spaced about .254 Inch apart. The tops of the hoies are 60 then countersunk to have a surface diameter of about ?g inch. This arrangein@ent leaves a minimum of solid metal between each hole and at the same time provides a rigid structure. In this manner, all portions of the pickup felt and 65 fibrous *eb passing over the suction area of the suction roll are subjected to suction. At the same time, the holes are of comparatively small diameter and the felt a-nd web are not pressed away from the top press roll or damaged by being 70 sucked Into these holes. If desired the suction roll 17 may be covered with a resilient cov8ring or cushion which Is perforated in the manner described and claimed in my United States Patent No. 1,947,636. 75
2,088,817 3 The presg roll 16 is mounted above the s@ction roll 17 in horizontal bearing btackets 25 eceentricdlly. pivoted at 26 on a supporting angle 27 carried by the vertical legs_ 16 of the frame struc.5 ture. The roll 10 is thus adjustable horizontally relative to the suction roll 17 by a rotatiori of the eccentric pivot 26. The brackets 25 have an extending arm portion 28 tb-ereon for receiving a link rod 29 which extends vertically toward the 10 bottom of the machine and Is secured at 30 to a horizontal arm 31 pivoted at 32 to the vertic@l .leg 15 of the frame structure. The lever arm 31 may have weights 33 mounted thereon for holding the press roll I 8 against the suction roll 17 15 with any desired pressure which may @e regulated by a movement and/or replacement of the weight 33. It is obvious that other pressure adjusting devices may be used In place of the link arm arrangement shown. 20 For raising the roll 18, a device 34 is prdvided co,mprising bolts screwed through the bracket arms 25 and adapted to engage the supporting angle 27 as shown. A save@all,tray 35 is mounted around the lower 25 portion of the suction roll 17 and is adapted to receive water removed from the web and.felt by the, press@ng operation. This, save-all tray Is pr6ferably V-shaped as shown having a vertical.. leg 36 extending behind the suction roll U7 and a 30 horizontal. leg 37 below the, suction roll. Adjacent the en(I of the leg,37 is mounted a wiping device 38 adapted to scrape against the periphery of the. suction roll. The wiping device -38 is pivoted.at 39 and hiay be urged against the roll 35 17 by any suitable couhterbalance or spring means. A thin metal strip 40 Is. cartied by the wiping member 38 to direct any of the water removed from the periphery of the suction roll Into the sav6-all tray 35. 40 Ananglemember4lismountedon-jo'urnals42 adjacent the top of the presg roll 18. ' The horlzontal leg of the angle 41 carries a flexible rubber or coniposition strip 43 which rests on top of the press roil to rub off any - water carried bY th,e 45 roll. @ The ahgle 41 and the rubber @trip 43 extend across fhe- width of the ioll 18 s(i that any water scraped therefrom may drop into,the gayeall tray 35" *hich also extends,beyond the length of the su6 I tion roll 17. 50' In the arrangement shown In Flgure 11 the water removing device isoperated without the use of a top press felt. In Mgure 4, howe@er, a top liress felt 45 is directed over the suctiori ro 17; and travels with the pickup feit f 2 and flbrous 55 web thereon between the nip, of the suction and pre@s rolls. It is then directed away from the fibrous:w6b catried by-the pickup felt 12 and over guide rolls 46. The top felt 45 may be guided by means of ari bdjustable guide roll 47 to. meet the 6o Pick up felt and fibrous web th(@reon at varying points on the suction roll and vary the amount of wrap of this felt around the roll. Thus if the pickup felt follows the path Indicated In solid line it coritacts the flibrous web on the pickup felt 12 r)5 at a point about midway between the ends of the suction zo-ne A. However, if the felt guide roll 47 is raised to the position indicated in dotted line the top felt 45 merely contacts the fibrous web on the pickup felt 12 at the top portion of the roll 7o and travels with the web through the nip between the rolls. It is desirable to.vary the amount 6f wrap of the top felt around the suction roll depending upon the weight and porosity of the paper being 75 produced. When light weight papers are run over the suction -_@rea, the amount of wrap of the top felt around tiae suction roll should be Increased to cover all or most of the suction area to seal the same, ttiereby permitting the puuing of a higher vacuum on the sheet to more thoroughly dry the 'sheet. When heavier and Iess porous papers are run over the suction area, however, the amount of wrap of the top felt may be reduced. The top felt therefore protects the exposed surface of the flbrous web on the pickup felt during the pressing operation and acts as a seai to prevent loss.o@ suction. On the return run, the top felt 45 Is guided over the machine by means of guide rolls 48. Since water is pressed up through the top feit It as It passes through the nip between the rolls, a resilient plain slice 49 may be positioned abbve the suction roll 17 to wipe against the felt 45. The plain slice 49 extends across the width of the felt and,prevents the water from runiiing back 2( on the felt and being reabsorbed by the sheet. It directs this water over the edges of the felt and roll 17 so.that the water drops Into the save-all tray 35. The plain slice 49 may be carried by suitable journals 50 mounted at its ends In the 25 franie structure. A suction.slice 51 (Mgure 5) may be used in piace of the pl4in slice 49. T@is siice 51 Is verticary adjustable, at each end on supports 52 by means of ntits 53 and. 54 thr'eaded on the su orts 30 pp 52 and 6ngagirig lugs 55 and 56 rdspectively ext6nding from the suction manifold 57 of the slice. The. sqpports'52 extend through the lugs 55 and 56 and are cgrried by the frame strueture of the machine. A lit) 58, having a passage- 35 way 59, or a pl'urality of such passageways . extending thlerethrough Is mounted at one end in the manifold -57, as . shown, and proje6ts into the space between the. press roll 18 and the suction drum 17. 'Ms li p 58, like the plain slice 49, 40 extends. across the width of -the top felt 45 but instead of merely directin@ th@@ water on the top felt over the edges of,the felt it draws the water through the P-assageways therein into the sue'tio n manifold 57. The manifold 57 is connected 45 at one or ',b6th ends with a suction drain line (not,'showh). From the above description, it will be understood that I have now provided a combnation suction and press device for removing watelr - from. 50 cylinder formed fibrous webs without crushing or distorting the web s,o that a sheet of maximum strength per unit weight is obtained. The small holes in the suctioii roll permit pressure to be 6xerted on the web as It passes over the roll f6r 55 the removal.of furthcr quantities of water without damaging the web or felt. These small holes also prevent. the web and felt from being drawn away from the top roll. The combination suction -and press I rolls therefore sufficiehtly remove the 60 water from the wet web without damage and without the use o . f the large number of extrdetor rolls, primary press rolls and'the like water removing means used heretofore. The wet w eb em6rging from the la'st cylinder 65 mold of a cylinder type paper machine generally contains about 88% by weight of water, while the pickup felt may contain even higher amounts depending upon the pressure exerted by the 70 coucher rolls. The suction roll part of this invention before the nip of the press part reduces the water content of the web about 10% to about 78@7o water. The pressure roll then squeezes out further quantities of water drying the web to 75 1(
4 2,083,817 about 70% water or less depending upon the pressure exerted. 7be web is thus suffleiently dried and formed to be passed directly to the heavy duty pre@sses or to the driers. The suction roll as shown on the dmwlngs has a very wide suction area defined by a floating head on the suction box. 'rbiq construction makes it possible to pull a vacuum of 12 inches of mercury or more without deflecting the roU 1( or locking the suction box against the roll. The high vacuum combined with the large suction area makes possible a very, large extraction of water before the pressing operation. I am aware that many changes moy be tnade 15 and numerous details of constriietion may be varied through a wide range without departing from the principles of this invention and I, therefore, do not purpose limiting the patent granted hereon otherwise than necessitated by the prior 20 art. I clgim as my Invention: 1. In a cylinder type paper machine, in combination, a plurality of cylinder molds, a plurality of couch rolls cooperating with said cylin25 der molds, a pickup felt cooperating with said cylinder molds and couch rous to receive t-he fibrous webs formed on the cylinder molds, a suction roll positioned after the last cylinder mold, a relatively wide floating head in said suction roll to deflne a wide suction area on t]@ie periphery of said roll, means for guiding said pickup felt with the Ilbrous web thereon over the suction area of the suction roll, said suction roll being perforated with closely spaced holes 35 of small diameter so that the web and pickup felt will not be deforined as they pass over the suction area, a press roll above said sucti6n ron, means for urging said press roll against the web 'on the pickup felt at a point on the suction roU 40 near -the end of the suction area thereof, means for adjusting the horizontal position of said press roll relative to said suction roll, means for adjusting the pressure between the rolls, a water collecting trough around the lower portion of 45 said suction roll, an apron member extending axially across said press roll aiid beyond the ends of the press roll for removing--water from the press roll and directing the same into the trough, a wiper device urged agatnst the bottom of said 50 suction roll for removing water therefrolfi and means associated with said wiper device for dirt,eting the water removed thereby into the trough. 55 2. The process of extracting water from wet flbrous webs Just subsequent to their formation on a cylinder paper machine which comprises conveying a pick up felt carrying the newly formed wet web removed thereon directly frgm 60 the cylinders away from the cylinders, wrapping the felt and web around the suction area of a suction roll, wrapping a top felt around,the suction area of the roll to cover the wet web thereon, sucking water from the web and pick up felt as 65 they pass over the suction area, and squeezing additional amounts of water therefrom. 3. In a cylinder paper machine including cylinder molds and a pick up felt for receiving a wet fibrous web therefrom, a sucti,,n drum located 70 after the last cyhiider mold in spac6d relation therefrom, a press roll urged thereagainst, means for directing the pick up felt and web around said drum and between the, nip of the roll and drum, a top felt and an adjustable top felt guide 75 roU to wrap the to.p felt over the web around the dnm for a predetemmilned amount, of travel thereover. 4. The process of extracting water from the wet, soggy, cylindier-formed flbrous mats rtmoved from the cylinder molds on a pick-up felt which 5 comprises co.nv@ying the mat on the felt away from the cylinder i3iolds,,wmpping the felt with the mat thereon around the suction area of a suction roll to remove water from the mat by suction, contacting the mat with a top felt, and 10 pressing the two felts together with the mat therebetween to remove more water therefrom and thereby forzn 9, self-supporting flbrous web from the mat. 5. In a, cylinder type paper making machine, 15 a pick-up felt for directly receiving the wet, soggy, flbrous mats from the cylinder molds, a diiecting roll positioned after the last cylinder mold for receiving the pick-up felt therearound, a water extracting device above the directing roll 20 for receiving thereover the niats and felt from the directing roll, a top felt for coverlng said mats on the pick-up felt as they paw over the water extracting device, and means for pressing the top f6it and the pick-up felt together with 25 the mats therebetween. 6. The process of removing water from the wet, sc)ggy mats picked up by a felt from the cylinder MOICIS Of a cylinder type paper machine which comprises training the pick-up felt with the mats 30 thereunder around a guide roll Positioned after the last cylinder mold, directing the pick-up felt upwardly from the guide roll around a suction drum, covering the flbrous mats with a top felt as they pass around the suction drum, and ex- 35 tracting water from the fibrous mats through the pick-up felt by suction to form a fibrous web from the mats. 7. The process of extracting water from wet fibrous webs just subsequent to their forniation 40 on a paper machine which comprises picking,up the wet flbrous web on a pick-up felt directly from the'forming surface of the paper machine, conveying.the web on the felt away from the forming surface, wrapping said pick-up felt with 45 the web thereon around the suction area of a suctionrou, wrapping a top felt around part of the suction roll to cover the wet web thereon, sueldng water from the web and pick-up felt as they pass over the suction area of the roll, 50 and squeezing additional amounts of water therefrom. 8. In a paper machine, a flbrous web forming part, a pick-up felt for receiving a wet fibrous web therefrom, a suction drum located after the 55 fibrous web forming part of the machine, a pr6ss roll urged against said suction roll, means for directing the pick-up felt and web aroiind said drum and between @he nip of the roU and dn=, a top felt for covering said web, and an adjust-, 60 able top felt guide roll to wrap the top felt over the web around the drum f-pr a predetermined amount of travel thereover. 9. In a paper machine having a flbrous web forming surface, a pick-up felt for receiving a 65 wet, soggy web from the forming surface, a suction roll spaced from said forming surface, said suction roll having a wide suction head therein for defining a large suction area on the 70 periphery of the roll, means for training the felt with the web, thereon over said suction area, said suction roll being perforated with closely spaced holes of smalj diameter so that the web and pick-up felt will not be deformed as they 75
