|Publication number||US2415350 A|
|Publication date||Feb 4, 1947|
|Filing date||Mar 13, 1944|
|Priority date||Mar 13, 1944|
|Publication number||US 2415350 A, US 2415350A, US-A-2415350, US2415350 A, US2415350A|
|Inventors||Hornbostel Lloyd, Edward D Beachler|
|Original Assignee||Beloit Iron Works|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (11), Referenced by (16), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1947. L HORNBOSTEL ETAL 2,415,350
PRESS ROLL ARRANGEMENT FOR PAPER MAKING MACHINES Filed March 15, 1944 3 Sheets-Sheet l fiver-1. :FE (40x0 flaemeosrzz. ow/:20 0. 6679019452.
1947- L. HORNBOSTEL ET AL 2,415,350
PRESS ROLL ARRANGEMENT FOR PAPER MAKING MACHINES Filed March 13, 1944 3 Sheets-Sheet 2 Lam 0 HOEIVBOJ n51 Eon/4.90 D. BEAU/LE8- 1947- L. HORNBOSTEL ETAL 2,415,350
IRESS ROLL ARRANGEMENT FOR PAPER MAKING MACHINES Filed March 13, 1944 3 Sheets-Sheet 3 HYEHZCIP E 11.0) floemsosrez. E0 wmeo 0. 547405158.
w ite-d 4 1947 v PRESS ROLL ARRANGEMENT FOR PAPER- MAKING MACHINES Lloyd Hornbostel and Edward D. Beachler, Beloit, Wis., assignors to Beloit Iron Works, Beloit, Wis., a corporation of Wisconsin Application March 13, 1944, Serial No. 526,199
. 9 Claims. v 1
This invention relates to suction pick-oil roll assemblies and press sections for paper making machines.
Specifically the invention deals with paper makin machine presssections wherein the paper web advancing through the press section from the forming section to the drier section never has the direction of travel changed unless it is disposed between a pair of felts, or subjected to suction. The press sections of this invention include cooperating suction transfer rolls and press rolls wherein one roll of a cooperating pair receives the sheet and subjects it to low vacuum to hold it thereon for conveying ,it to a transfer point, thereby eliminating any chance for the sheet to fly oil the roll when traveling at high speed.
It has heretofore been necessary to use singed pick-up felts in drier sections in order to keep the sheet on the felt especially as it passes through a top pick-off roll assembly in being transferred from the formingsection to the press section of the machine. Such singed pick-up felts have also been necessary in suction presses since the felts are usually separated or divided after the first suction press. Now, the singed type of pick-up felt is very heavy and resists water removal as it is quite dense, and air and water will not readily pass through it.
The present invention makes possible the use of very open, porous felts for conveying wet fibrous webs from their forming surfaces through the press section to the drier section of a paper machine. In accordance with this invention the paper web is never permitted to turn around a roll, and never has its direction of movement changed, unless it is held on its carrier felt by means of vacuum or is between a pair of carrier felts. The present invention simplifies felt runs in press roll sections for paper making machines and especially Yankee-type paper making machines,
A feature of the invention involves the elimination of the heretofore encountered problem of havin the sheet stick to the wrong felt after leaving a suction press. In accordance with this invention, a felt conveying the web to a suction press has the web covered with a cooperating felt in advance of the press, and suction in advance of the nip of the press transfers the web from the carrying felt to the covering felt. Then, as the pair of felts with the web therebetween pass through the nip of the press, the web is retransferred back to the first felt and held thereon by suction applied through. the first felt after the nip area. This eliminates the heretofore encountered dimculties in having the web stick to the covering 2 felt. As a result of this feature of the invention, press sections can be operated more efficiently and at higher pressures.
A further feature of the invention is the provision of transfer roll assemblies with high vacuum and-low vacuum areas wherein the low vacuum areas will hold the sheet on a roll feeding it to a transfer point and will remove some water from the sheet while so holding it, and wherein the high vacuum areas will dry the sheet, and hold water in the holes of the roll until the sheet is removed out of the path of water discharged from said holes.
An object of the invention is therefore to provide press sections for paper making machines capable of handling paper at high speedswithout the use of singed pick-up felts to convey the paper.
Another object of the invention is the provision of paper machine press sections with felt runs and suction rolls so arranged that the direction of the paper is not changed through its entire passage between the forming section and the drier section of the machine unless the paper is disposed between a pair of felts, or is held on a felt by suction applied through the felt.
A still further object of the invention is to eliminate the possibility of separation of a web of paper from the carrier felt as the felt and paper turn around a roll by subjectin the paper to vacuum during the entire time it is changing direction of travel.
A still further object of the invention is to provide a transfer roll assembly having a, suction couch roll cooperating with a suction transfer roll and a final couch roll or turning roll for directing the forming wire off of the couch roll at the nip between the couch roll and transfer roll.
A still further object of the invention is to provide a press section for a Yankee-type Fourdrinier paper making machine wherein suction transfer rolls and suction press rolls cooperate with open readily drained felts to convey the paper through the section without encountering undesired separation of the paper from the felt, irrespective of the speed of operation.
A still further object of the invention is to provide a Yankee-type Fourdrinier paper making machine with a drier section including a, predrier drum in advance of the main drier drum and suction rolls cooperating with felts to continuously support the paper web from the forming section to the main drier drum.
Other and further objects of the invention will be apparent'to those skilled in the art from the following detailed description of the annexed 3 sheets of drawings which, by way of preferred examples only, illustrate two embodiments of the invention.
n the drawings:
Figure 1 is a fragmentary somewhat diagrammatic side elevational view of the press and drier sections of a Yankee type Fourdrinier paper making machine embodying transfer and press roll assemblies and felt runs in accordance with this invention.
Figure 2 is an enlarged side elevational view, with parts broken away and shown in vertical cross section, of the transfer roll assembly of Figure a Figure 3 is an enlarged fragmentary side elevational view, with parts broken away and shown in vertical cross section, of another transfer roll assembly of Figure 1. I
Figure 4 is a somewhat diagrammatic side elevational view of a press and drier section of a Yankee-type Fourdrinier paper making machine equipped with transfer rolls, suction presses, and felt runs in accordance with a modified embodiment of the invention.
As shown on the drawings:
In Figure l the reference characters F designate a floor section of a paper mill supported on columns 0 above a basement floor, for example, and carrying posts P supporting overhead beams such as B.
Supports for a transfer roll assembly ID, a first horizontal press roll assembly Hi, a second vertical press roll assembly l2, a predrier drum assembly, l3, a stripper roll assembly l4, a second transfer roll assembly l5, and the first drier drum l5 of a drier section are carried on the floor F. A support for the Yankee drier drum i1 is mounted on the beams such as B.
As shown in Figures 1 and 2, the transfer roll assembly Ill includes a suction couch roll l8 and a plain couch or turning roll I9 within the loop of the paper machine forming wire together with a suction transfer roll 2| and a plain guide roll 22 within the loop of a pick-up felt 23.
The suction transfer roll 2| mounted on the floor F as at 24 and a pressureapplying jack 25 coacting with the adjacent post P maintains the transfer roll in cooperating relation with the couch roll to define a transfer nip N therebetween.
The forming wire 20 is wrapped around the top of the suction couch roll l3 and travels downwardly under the plain couch roll or turning roll l9 to convey the web of paper W thereon through the nip N of the assembly onto the pick-up felt 23 which is guided into the nip N by a guide roll 26 positioned outside the loop thereof and which is guided out of the nip by the roll 22 inside of the loop thereof.
The suction couch roll l8 has a suction gland or box 21 therein with packing strips 28. 29, and proiecting therefrom into sealing relation with the perforated shell 32 of the roll. The shell 32, of course, is rotatable around the stationary suction box 21, and the packing strips 28 and 29 are positioned to extend around the downturning side of the roll to define a suction area a serving to hold t e wire 20 and web W tightly against the shell 32 even though the wire and web are traveling at high speed. A butterfly-type valve 33 controls the extent of communication between the suction area a and the interior of the suction box 21 so as to regulate the degree of suction in t e area a. This suction area a is generally maintained under a relatively low vacuum and is pivotally 4 its function is to hold the sheet W on the roll and to remove some water from the sheet. The spaced packing strips 29 and 30 define a suction area b in full communication with the interior of the suction box 21, and this suction area extends from the area a into the nip N. The function of the suction area b is to remove water from the with W and to prevent the water in the holes of the shell 32 from being discharged back through the wire into the web.
The transferroll 2| has a stationary suction box or gland 34 therein with a perforatedmetal shell 35 rotatable therearound and covered with a similarly perforated rubber cover 36. The suc tion box has spaced packing strips 31 and 38 defining therebetween a suction area 0 in full communication with the interior of the suction box 34 and extending from the nip N into spaced relation beneath the nip.
The turning roll or plain couch roll i9 wraps the forming wire 2|! partially around the transfer roll 2| to guide the wire oil of the roll l8 at the point where the holes in the roll shell 32 are passing over the packing strip 30 so that the wire and web W thereon is out of the path of streams of water S discharged from holes in the shell when the vacuum in the holes is released. It will be noted from Figure 2 that nip N terminates at the packing strip 30 so that the wire is not removed from the shell 32 when the holes in the shell are in communication with the suction area b. As a result of this arrangement high vacuum can be maintained in the suction area b. The streams of water S are collected in a pan or trough 39 surrounding the roll l8.
The pick-up felt 23 is wrapped around the rubber cover 36 of the transfer roll 2| and covers the suction area 0 to receive the web W from the wire 20 as the web passes through the nip. It will be noted that the suction area c extends for a distance beneath the nip to subject the pick-up felt and web to suction for insuring complete transfer of the web off of the wire onto the pickup felt as well as to prevent the web from flying outwardly back toward the wire. The pick-up felt with the web thereon passes tangentially off of the roll and travels in a straight path to the guide roll 22. A guide roll '40 adjacent the roll 22 directs a bottom felt 4| against the web W on the pick-up felt 23 before the web and felt turn under the roll 22. Therefore as soon as the direction of travel of the web W is changed, the web is covered by the felt 4| and cannot fly off of the felt 23.
As shown in Figure l, the web W between the pick-up felt 23 and covering felt 4| passes from the roll 22 to the first horizontal suction press assembly around the top of the suction roll 42 thereof. thence downwardly throu h the nin between this roll 42 and the cooperating roll 43.
The roll 42 has a first low vacuum suction area 42;; extending from the top thereof to a high vacuum area 42b extending through the nip of 5 the rolls. A valve 420 is provided to regula e the vacuum in the area 42a as com ared with the high vacuum in the area 42b. The roll 43 .has a suction areav 43a, in the nip and a low vacuum suction area 43b extending around the bottom part of the roll from the area 43a and having the vacuum therein controlled by a valve 43c.
As the web between the felts 23 and 4| passes through the nip of the horizontal press, it is subjected to vacuum from both high suction areas 42b and 43a so that water will be sucked through 5 a both felts out of both faces of the web. The felt 4| is separated from the web after passage v wringer rolls 4! back to the roll 48.
The transfer roll 2|, like the couch roll I8, is equipped with a trough '48 collecting streams of water S spewing from the holes in the rubber cover 38 and shell 85 after vacuum in the holes is released. but it will be noted that the roll 22 guides the web and felt out of the path of these streams S.
I The roll 42 of the press ll likewise has a trough 4'I collecting water from the holes in the roll shell. A collecting pan or trough 48 is provided for the rou43 of this press.
The felt 28 with the web W is covered with a second bottom felt 48 as soon as it leaves the suction area 431; of the roll 44 and passes between the felts 28 and 48 through the nip of the vertical press between the rolls 88 and El ofthis press. The roll 88 isasuction roll and has a high vacuum suction area 884: at the nip together with a lower vacuum-suction area 50b controlled by a valve Etc-extending fromthe vacuum area 58a around the top turning portion of the roll. The roll jack 52 suspended desired amount of pressure against the roll- 50. The web w is transferred oil' of the'pick-up felt 23 as it, passes through thenip of the vertical press and suction in the suction areas 80a and- 58b holds the web on felt-48. The felt-28 passes upwardly around the top roll II over a guide roll 53 and thence under a guide roll 54 and upwardly between wringer rolls I58. A- shield 881s provided to define a trough under the roll 54 so that water squeezed out of the felt by the wringers 58 will not rewet the felt or web. The felt next travels over a guide roll 58, thence arounda guide roll 51 to a tension roll 58 and next from the tension r03 5: around a guide roll 88 back to the directing r 2 The felt 49 conveys the web around the roll 50 to the predrier l8 and contacts the web with the drum 6|) of this predrier. The felt'causes the web to be held in tight engagement around the periphery ofthe drum where it will be dried by the heat of the drum. The felt 48 is then trained around the roll 8| of the stripper M. This r011 6| has a high vacuum suction area 6|a extracting water from the web and pulling the web off of the drum 80 to cause it to hug the felt 49. A low vacuum suction area 6|b controlled by a valve tlc is provided to cause the web to remain on the felt as it passes around the roll 6|. These high and low vacuum areas may be constructed in a manner similar to that shown in Figs. 2 and 3. A covering felt 82 is directed over the roll 8| to cover the web thereon by means of a directing roll 88. The web passes between the felts 49 and 62 to the under side of the roll 84 of the transfer l8. This roll 84 as best shown in Figure 3, includes a perforated rotatable'metal can be a plain or rubbercovered roll, and-is carried on a pivotal support Sla from the adjacent post 1? and isurged by from the beam -B with a felt 48 is separated from the web W and the web is transferred onto the covering felt 62 by the suction area d. A guide roll 69 directs the felt 48 away from the roll 64 and the felt then passes over guide rolls 18 to a tension roll H and around rolls I2 back to the roll 18 which directs it into recontact with another portion of the web at the suction'roll 48.
The suction area e of the roll 84 holds the web JV on the felt 62 as it travels around the roll,
, and the suction area of this roll extracts an additional amount of water from the web in advance of the nip provided by theroll and the drum 14 0f the cooperating Yankee H. The nip is at the terminal end of the suction area I so the web is transferred to the drum I4. Any water released from holes in the shell 65 and its rubber cover 66 is caught in a trough l5. The felt 62 passes over the top of the .roll 84' and under a guide roll 16 having a shield 'II 'therearound.
The felt then passes upwardly between wringer rolls 18, and any water squeezed out of the felt will be collected in the shield 11. This shield can cooperate with the trough It to discharge its water into the trough; Guide rolls I8 and ten sion roll 80 guide the felt back to the directin roll 68 over the top of the stripper roll 6|.
shell 65 covered with a similarly perforated rubarea e is controlled by means of a valve .88. T110" on the drum 88.
The paper is conveyed around the drum l4 and is removed from the drum by means of a doctor 8| Rolls 82 then guide the paper, which may be creped, to the first drier 88 of the drier section IS. A felt 84 can be provided to hold the paper It will be noted that the entire passage of the paper from the forming .wire 20 to the Yankee drier 14 is accomplished without changingthe direction of travel of the paper unless it is held on a felt by means of suction, or disposed between two felts. This prevents an possible separation of the paper from a carrier felt and the section can be run at very high speed without injury to even a very light weight delicate web such as tissue.
A jack 85 is provided on the floor F cooperating with a pivoted trunnion lever 86 which is pivoted on a post P as shown to support the roll 84 of the transfer device It. The jack 85 can be operated so that the transfer roll 64 will have the desired nip pressure with the Yankee drum I4.
In the embodiment shown in Figure 4, parts identical with parts described in Figures 1 to 3 have been marked with the same reference numeral. It will be noted from Figure 4 that the couch roll l8 does not have nip pressure with the cooperating transfer roll 2| since it is spaced from the transfer roll but the turning roll l9 guides the forming wire 20 so as to wrap the transfer roll 2| over the suction area 0 thereof. The suction area 0 can then transfer the web from the wire 20 to the pick-up felt 23. This pick-up felt cooperates with the bottom felt 4| as described hereinabove to convey the web between felts to a first press |2 which has vertical press rolls 50 and BI with a suction area 58a in the roll 50. The felt 4| and the top felt 23 then convey the web from this first press l2 directly to the transfer assembly |8 where the web is transferred to In this arrangement the ure 4, like the arrangement of Figure 1, does not permit the direction of travel of the web to 7 change from the time it leaves the forming wire 20 until it reaches the drum of the Yankee drier Il unless the web is either held on a felt by suction, or disposed between two felts.
The suction transfer assemblies and press rolls of this invention having the low vacuum suction areas cooperating with high vacuum suction areas make possible the holding of an uncovered web on a felt as it passes around a roll even at .the highest speeds without permitting the web to leave the felt and without necessity for slowin up the assembly- The arrangement also makes possible the useof lighter, more open, and less dense felts in place of the heretofore necessary singed pick-up felts. The open felts are readily drained and suction capacity for pulling water and air through them is much less than when the denser singed felts-are used. As a result, the low vacuum areas which hold the web on the felt and effect a better transfer than the heretofore used singed pick-up felts, do not increase the suction requirements above those requirements heretofore necessary with the singed felts.
under the influence of vacuum whenever it would have a tendency to leave the felt.
2. In a paper making machine, a looped forming wire having an upper run, a couch roll in the loop of the wire at the end of said run, a turning roll in the loop of the wire below the couch roll receiving the wire from the couch roll, a looped pick-up felt, a transfer roll in the loop of said It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.
We claim as our invention:
1. In a paper making machine, a looped forming wire having an upper run, a, couch roll in the loop of the wire at the end of said run, a turning roll in the loop of the wire below said couch roll receiving the wire from the couch roll, a looped pick-up felt, a transfer roll in the loop of said pick-up felt projecting into the run of the forming wire between the couch roll and turning roll for wrapping the pick-up felt, the forming wire, and any web on the forming wire around a portion of the transfer roll, said couch roll having a low vacuum area extending around that portion of the roll covered by the wire as it turns from its horizontal run to travel toward the turning roll together with a high vacuum area following the low vacuum area, said turning roll separating the forming wire from the couch roll as the wire leaves the high vacuum area of the couch roll, said transfer roll having a vacuum area in the portion thereof covered by the pickup felt and wire effective to transfer the web to the pick-up felt afterthe web has passed the high vacuum area of the couch roll, a. directing roll in the loop of the pick-up felt receiving the felt from the transfer roll around the under side thereof and providing a straight; run of felts between the transfer roll and thedirecting roll, a bottom felt covering the web on the pick-up felt before its straight run direction is changed and cooperating with the pick-up felt to convey the web therebetween, a suction press receiving the felts and web therethrougli, a second directing roll separating the felts and uncovering the web, a drier drum, a suction roll adjacent the drier drum receiving the uncovered web therearound, and said suction roll having a pair of spaced high vacuum areas positioned to act on the web as it comes onto the roll and as it leaves the roll to felt, a directing roll in the loop of said felt below the transfer roll, said transfer roll receiving a portion of the forming wire and an web thereon therearound in the run of the wire between the couch roll and the turning roll, said directing roll separating the pick-up felt from the wire, said couch roll having a vacuum area therein holding the web on the forming wire as it travels around the roll and also having a second vacuum area following said first mentioned area to extract water through the wire from the web, said transfer roll having a suction area receiving the web from the last mentioned suction area of the couch roll to transfer the web to the pick-up felt, a covering felt trained around the directing roll inthe loop of the pick-up felt for covering the web thereon at the end of said straight run of said felt, a horizontal suction press having roll receiving the felts with the 'web therebetween therearound, said roll having a low vacuum suction area causing the felts and web to closely hug the roll, said suction press having a suction nip with opposed vacuum areas for drawing water through both felts from the web, a roll separating said bottom felt from said web, the second roll of the horizontal press having a low vacuum area therein holding the uncovered web-on the pickup felt as it travels under the roll, a second covering felt, a vertical suction press receiving the second covering felt and pick-up felt with the web between the felts from the second roll of the horizontal press, the top roll of said vertical press receiving the pick-up felt therearound, said bottom roll of the vertical press having a suction area in the nip of the press and a second suction area beyond said nip holding the web on the second covering felt as it passes around the roll, a drier drum receiving the web on the second covering felt from said bottom roll of the vertical press, a stripper roll adjacent the drier drum having a suction area for holding the web on the covering felt as it passes around the stripper roll, a top felt cooperating with the stripper roll to cover the web on, the second bottom felt, a transfer roll in the loop of said top felt having a first suction area for transferring the web from the second bottom felt to the top felt together with a second vacuum area holding the web on the top felt as it travels around the roll, and a drier drum receiving the web from said roll, said web in its entire travel from said forming wire to said last mentioned drier drum being held under the influence of vacuum or disposed between felts whenever it would have a tendency to leave the elt.
3. In a paper making machine, a looped forming wire having an upper run, a couch roll in the loop of the wire at the end of said run, a tuming roll in the loop of the wire below the couch roll receiving the wire from the couch roll, a looped pick-up felt, a. transfer roll in the loop of the felt, a directing roll in the loop of the felt, said transfer roll and directing roll holding the pick-up felt against the forming wire and any web thereon in the run of the wire between the couch roll and the turning roll, said couch roll having a vacuum area holding the web on the operate with the pick-up felt for conveying the web therebetween, a suction press receiving the felts with the web therebetween, a second transfer roll in the loop of the pick-up felt receiving the felts and web from the suction press, a second roll in the loop of the bottom felt separating the bottom felt from the web said second transfer roll having a suction area for/transferring the web to the pick-up felt and holding the web on the pick-up felt as it travels around the roll, and a drier drum cooperating with the second transfer roll to receive the web therefrom, said web: in
its entire travel from the upper run of the forming wire to the drier drum being under the influence of vacuum or between felts whenever it would have a tendency to leave the felt.
4. In a paper making machine including a looped forming wire and a drier drum in spaced relation therefrom, a suction press section between the forming wire and the drier drum including a looped relatively open lightweight pickup felt, a suction transfer roll in the loop of the felt picking up the web from the forming wire, a pair of rolls arranged for extending between them the wire while carrying the web to .wrap it partially around the suction area of said transfer roll, a bottom covering felt cooperating with the pick-up felt to cover the web, the suction press receiving therethrough the felts with the web therebetween, a roll in the loop of the covering felts separating said felts to uncover the web, one of the rolls of said suction press having a vacuum area holding the pick-up felt and uncovered web thereon on the roll asit travels therearound, a second bottom felt covering the web on the pick-up felt as it leaves the suction press, a second suction press receiving therethrough the felts with the web therebetween, said pick-up felt following one of the rolls of said second suction press and said second covering felt following the other of the rolls of said suction press, said other roll having a vacuum area holding the web on the second bottom felt, and a drier drum receiving the web from said other roll of the second suction press, said web in its entire travel from the forming wire to the drier drum being under the influence of vacuum or disposed between felts whenever its direction of travel is changing, or whenever it tends to leave the felt.
5.'A suction transfer roll assembly comprising a suction couch roll, a forming wire trained around the couch roll, a turning roll receiving the forming wire therearound from the couch roll, said couch roll having a low vacuum area for holding a web of paper on the forming wire as it travels around the couch roll, said couch roll also having a high vacuum area adjacent the lowvacuum area to extract water from the web, a cooperating suction transfer roll, said turning roll separating said wire from said couch roll at the end of said high vacuum area, a pick-up felt trained around said cooperating suction roll, a directing roll within the loop of the Pick-up felt, said directing roll cooperating with said turning roll to separate the pick-up felt and the forming wire, and said suction transfer roll having a suction area covered by said pick-up felt for transeferring the web from-the wire to the pickup felt. 1
6. A suction transfer roll assembly comprising a pair of cooperating suction rolls, a forming wire 5: and means trainingv said wire around one of said suction rolls with its web carrying surface facing outwardly and thereafter partially wrapping the wire around the other roll-with its web carrying surface; facing said other roll following the nip of said rolls, a pick-up felt trained around said other of said suction rolls, the first said suction roll receiving the forming wire therearound having a low vacuum suction area to hold the web onthe -wire as it travels around the roll and having a smaller high vacuum suction area immediately following. the low vacuum area to extract water from the web on the wire, said other suction roll receiving the pick-up felt therearound projecting into the path of the forming wire and web as it leaves the high vacuum area of .said first roll, and a vacuum areain said, second roll following the nip of the rollers acting through the pick-up felt to drawthe web-from the wire onto the pick-up felt,
'7. In a paper making machine, a looped forming wire, a suction couch roll within the loop of the wire, a turning roll within the loop of the wire, said couch roll receiving the wire thereover and said turning roll receiving the wire thereunder -from'said couch roll, a stationary suction box in said couch roll having a first suction area of appreciable width holding a web on the forming wire as it turns around the roll together with a second and narrower suction area immediately following said first suctionarea, a valve cooperating with said suction box to maintain the first suction area at lower vacuum than the second suction area, said turning roll directing the wire oil of said shell after the holes in the shell have passed beyond the second suction area but before the said holes have had the vacuum therein released, and a collecting device interposed between the couch roll and the turning roll receiving water spewed from the holes in the shell of 45 the couch roll when the vacuum is released.
8. In combination, first and second suction rolls defining a nip therebetween, a forming wire trained around said first-suction roll through said nip, means for wrapping said forming wire par- 50 tially around said second suction roll beyond the nip, a felt for covering the paper web on said wire as it passes through said'nip, means guiding said felt to lap it around said suction roll beyond said nip, a suction box in said first suction roll 65 positioned to impose suction on the first roll preceding the nip and slightly beyond the nip, and
a suction box in said second roll positioned to suck water through the felt beyond the. nip for effecting transfer of the paper sheet from the m wire to the felt.
9. In combination, first and second suction rolls defining a nip therebetween, a forming wire trained around said first suction roll through said nip, means for wrapping said forming wire par- 65 tially around said second suction roll beyond the nip, a felt for covering the paper web on said wire as it passes through said nip, means guiding said felt to lap it aroundsaid suction roll beyond said nip, a suction box in said first suc- 70 tion roll having an offgoing seal so arranged relative to said nip that water sucked into the holes of the first suction roll will be thrown clear of the wire on the leaving side of the hip, and a suction box in said second roll positioned to suck 75 water through the felt beyond the nip for effecting transfer of the paper sheet from the wire Number to the felt. 2,088,817 LLOYD HORNBOS TEL. 2,340,108 EDWARD D. BEACHLER. 2,174,744 4. 5 2,209,760 REFERENCES CITED 2,204,42 The following references are of record in the 2,144,770 file of this patent: 118581546 UNITED STATES PATENTS 10 Number Name Date Number 2,338,465 Street Jan. 4, 1944 499357 1,701,226 Collins Feb. 5, 1929 8,636
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|US2784652 *||Jul 6, 1954||Mar 12, 1957||Beloit Iron Works||Paper machine dryer assembly|
|US2843025 *||Mar 31, 1954||Jul 15, 1958||Beloit Iron Works||Paper-making machines|
|US2847912 *||Aug 4, 1951||Aug 19, 1958||Beloit Iron Works||Paper making machine drive and control means therefor|
|US2850951 *||May 20, 1954||Sep 9, 1958||Beloit Iron Works||Paper-making machines|
|US4139410 *||Nov 1, 1977||Feb 13, 1979||Olli Tapio||Method of dewatering and drying in a Yankee machine|
|DE1038901B *||Feb 4, 1953||Sep 11, 1958||Beloit Iron Works||Saugpressenpartie fuer Papiermaschinen|
|DE1108060B *||Feb 18, 1953||May 31, 1961||Beloit Iron Works||Saugpressenpartie fuer Papiermaschinen|
|DE10333525A1 *||Jul 23, 2003||Feb 17, 2005||Voith Paper Patent Gmbh||Paper/cardboard web transfer assembly, between a continuous fourdrinier and a blanket in a papermaking machine, has a vacuum applied to the fourdrinier to retain extracted water and a stronger vacuum at the blanket to hold the web|
|U.S. Classification||162/290, 162/DIG.700, 162/359.1, 162/370|
|International Classification||D21F3/02, D21F3/04|
|Cooperative Classification||D21F3/0281, Y10S162/07, D21F3/04|
|European Classification||D21F3/02D, D21F3/04|