US2869437A

US2869437A - Paper machine press section

Info

Publication number: US2869437A
Application number: US534442A
Authority: US
Inventors: Hornbostel Lloyd; Edward D Beachler; Donald A Ely
Original assignee: Beloit Iron Works Inc
Current assignee: Beloit Iron Works Inc
Priority date: 1955-09-15
Filing date: 1955-09-15
Publication date: 1959-01-20
Anticipated expiration: 1976-01-20

Description

Jan. 20, 1959 PAPER MACHINE PRESS SECTION Filed Sept. 15, 1955 3 Sheets-Sheet l EWVEZYZQFE LLOYD HORNBOSTEL EDWARD D. BEACHLER DONALD A. ELY b c- L. HORNBOSTEL ET AL 2,869,437

1959 L. HORIQBOSTEL ET AL 2,369,437

PAPER MACHINE PRESS SECTION 5 Sheets-Sheet 2 Filed Sept. 15, 1955 .ZWETZfEFE LLOYD HORNBOS'TEL EDWARD ,D. BEACHLER DONALD A. ELY

. y z afi. 175 5.

1959 L. HORNBOSTEL ET AL 6 PAPER MACHINE PRESS SECTION Filed Sept. 15, 1955 3 Sheets-Sheet :5

ivyenibrs LLOYD HoraN BOSTEL EDWARD D. BEACHLER DONALD A. ELY

(V y M 225 5.

Ely B'eioit, Wis, assigtiors to Beloit iron Works, Beloit, Win, a corporation of Wisconsin Application September 15, 1955, Serial No. 534,442

21 Claims. (Cl. 9249) This invention relates to a paper machine press section which conveys a freshly formed moist Web of paper from its forming surface or forming wire to one or more presses, and more particularly, to a method and apparatus for conveying the web from the forming surface to a suction press without any open draws. v

In the earlier paper machine arrangements, the web was ordinarily taken from the forming surface over an open draw (i. e. an unsupported reach of the web) and then placed on top of a felt which fed the web through a first press defined by anupper bare roll and a lower suction roll. More recently, the suction pickup arrangement has been developed and this involves a looped pickup felt with a suction pickup roll within the loop which urges the felt a ainst the forming wire to pick up the web therefrom and guide the web along the underside of the felt to a first press. This first press involves an upper plain roll within the loop of the suction pickup felt and a lower suction roll within the loop of a second felt which ultimately receives the paper web to lead the same on through the machine. The suction pickup arrangement permits the use of much greater operating speeds in the machine with better efficiency, since the breaks in the web at open draws are minimized.

The instant invention is an improvement over the suction pickup arrangement hereinbefore described in that it permits still greater operating speeds and machine efficiency, plus the production of a uniquely uniform smooth web. For one thing, the instant arrangement involves the suction pickup roll and looped felt and it permits the use of the looped felt both as a pickup felt and a press felt by positioning a suction press roll within the loop of this felt. The suction press roll defines a first press nip with a bare or plain-surfaced roll which in turn defines a second press nip with another felt covered suction roll. In this way the wire side or bottom side of the web is subjected first to two successive presses against a plainsurfaced roll. Heretofore the wire side of the web was not subjected to a bare roll in a press at all, or not until later on in the press section when the web was substantially dryer and it could not be as effectively pressed to eliminatewire marks. In the instant arrangement, however, the wire side of the wet web is pressed by a bare roll at both the first and the second press nips through which the web passes and the wet web is guided from the forming wire to the first press without an open draw.

As an additional important feature of the instant invention it will be noted that the felt run from the suction pickup roll is downwardly inclined. This is an important feature affording a distinct advantage because the downwardly inciined felt traveling away from the suction area of the suction pickup roll (particularly if the saveall pan is positioned at the otfrunning side) does not receive water thrown from the perforations of the suction pickup roll by centrifugal force. The suction pickup felt is thus not subjected to the addition of water and in the next treatmentthereof a suction box onthe felt side draws water from the web through the felt. The instant 2,869,437 Patented Jan. 20, 1959 arrangement avoids the necessity of drawing water from a felt and through the web at any point in the operation of the presses.

Another feature of the instant invention involves the positioning of a guide roll between the suction pickup roll and the first suction press roll about which the guiding suction pickup felt is lapped. As will be appreciated, the OIl-COITGlfig and off-running reaches of a felt lapped 'over a guide roll cannot define an angle greater than or the felt will not be'lapped over or supported by the guide roll. The web is, of course, carried on the side' of the felt opposite that engaging the guide roll so that the web is actually urged away from the felt at the guide roll by centrifugal forces if a change in direction of the web around the guide roll is desired. For this reason earlier paper machine structures have been laid out so as to avoid abrupt changes in direction; but the instant arrangement takes advantage of an abrupt change in direction and overcomes any difficulties which might otherwise be involved by providing means for preventing the web from being separated from the felt when passing over'the guide roll. 7

It is, therefore, an important object of the instant invention to provide an improved method and apparatu's for de-watering a paper-web in the press section of a paper machine. I p 7 It is a further object of the instant invention to provide an improved method and apparatus for conducting a wet web through a-portion of a paper machine press section without an open draw, and pressing the wire side of the web against a bare roll at successive press nips in order to substantially eliminate wire marks. It is also an object of the instant invention to provide an improved method of guiding a paper web carried on a felt lappedover guide roll.

Other and further objects, featuresand advantages of the present invention will become apparent to those skilled in the art from the following detailed disclosure thereof and the drawings attached hereto and made a part hereof.

On the drawings:

Figure 1 is a diagrammatical view of a paper machine press section embodying the instant invention;

Figure 2 is a diagrammatical view of another paper machine press section embodying the instant invention;

Figure 3 is a fragmentary detail view of thesuction pickup assembly of Figure 2; v v

Figure 4 is a similar view of the first suction press roll in Figure 2; and

Figure 5 is a fragmentary detail view of the uppermost press roll shown in Figure 1.

As shown on the drawings:

The paper machine, indicated generally by the refer ence numeral 1t), shown in Figure 1, comprises a looped forming wire 11 Whereon the web W is formed and the forming wire 11 travels over a suction couchroll 12 with suction area 12a for de-watering the ,web W then around a turning roll 13 to reverse the"direction of the forming wire 11.

in the instant paper machine 10 there is provided a looped pickup and press felt 14, a suction pickup roll 15 (with suction area 15a and an appropriate save-all 15b) within the loop of the pickup felt 14 urging the pickup felt 14 against the web W on the forming wire 11 (between the couch roll 12 and the turning roll 13, where it is inclined downwardly about 35 from hori zontal) to pick up the web and transfer the Web W to the underside of the pickup felt 14. A guide roll 16 is mounted (beneath and ahead of the suction roll 15 in the direction of webtravel) within the loop of the pickup felt and cooperates with the suctionpickuproll 15 to define a firstgenerally horizontal or forwardly extending reach 14a of the pickup felt 14 therebetween. The

3 first reach 14a is sloped downwardly slightly (i. e. about 15 from horizontal) in the direction of felt travel and this reach 14a engages the top side of the web W and supports the web from above down as far as the guide roll 16.

Above the guide roll 16 a press, indicated generally by P, is suitably mounted. The press P 'comprises a pair of

press rolls

17 and 18 defining a prcss nip N-1 therebetween. Suction press roll 17 is above and behind the guide roll 16; and bare press roll 18 is above and ahead of suction press roll 17 (in the direction of web travel). The press nip N-l is generally vertically aligned (actually upwardly inclined about 60 from horizontal) and it is aligned angularly with-respect to the first reach 14a of the felt 14. A second reach 14b of the felt 14 is aligned generally with the press nip N-l and extends therefrom to the guide roll 16. Actually, the first reach 14a and the second reach 14b define an angle of approximately 45 although an advantageous feature of the instant invention permits the reaches 14a and 14b to define an angle of approximately 30 to 80, whereby the felt 14 is autually reversed in direction as it guides the web W from the forming wire 11 to the first press nip N-l.

As will be noted, the first press nip N-1 is defined by a suction roll 17 having a suction area 17a at the oncoming side of the nip N1 and a plain roll 18 outside of the felt loop. The suction roll 17 is within the felt loop and is generally below the nip N-1, so as to permit free flow of water from the press nip N1 downwardly and generally in the direction of the suction area 17a. As

.will be appreciated, the suction area 17a cannot be operated easily if the suction roll is above the press nip rather than below the press nip, or in other words, if the suction roll 17 is above the press nip and the plain roll 18 is below the press nip, because pickup of water through the suction area 17a is additionally complicated by the tendency of the water to flow downwardly away from the suction area in such an arrangement. The instant invention affords a particular advantage in this respect,

in that the invention permits the complete reversal of the travel of the web W on the felt 14 so that the felt 14 which initially engages the top of the web on the forming wire 11 and supports the web from above during the initial reach 14acan function to support the web W from below at the first press nip N1.

At the first press nip N-1 the web W is still quite wet and a substantial amount of water is removed therefrom, thus resulting in adherence of the wet web to the plain-surfaced roll 18 at the offrunning side of the nip N-l. The suction area 17a preferably does not extend beyond the nip N-l so that it will not serve to cause the web W to tend to remain on the felt 14 at the offrunning side of the nip N-l. This lack of suction plus the tendency of a partially dried web to adhere to the plain surface of the roll 18 will permit the web W to remain on the surface of the roll 18 and travel therewith.

The reversal of direction of the web W in passing around the guide roll 16 is, however, a different matter. For this reason, means associated'with the guide roll 16 and felt 14 for holding the web W 'on the felt 14 as it travels around the guide roll 16 are provided in the form of a traveling second felt 19 which covers the web W on the first felt 14 around the first guide roll 16. The traveling second felt 19 is mounted on guide rolls 20a. 20b, 20c, 20d, 20a, 20 and 20g. Guide roll 20d is also a tensioning roll as the two-headed arrow indicates and this roll 29d is employed to obtain the desired tension on the felt 19. One of the guide rolls, namely the roll 20a is lapped by the felt 19 and urges the felt 19 against 4 cent the first (14a) and second (14b) reaches of the pickup felt 14 to urge the felt 19 against the web guided by the pickup felt 14. The web W is thus supported by both felts 14 and 19 when its direction of travel is substantially reversed at the guide roll 16.

The accomplishment of the reversal in direction of the web W while protecting and guiding the same with felts is very important. By reversal of the web W is meant abruptly changing the travel of the web from its original direction to a second direction which forms an angle of or less with the initial direction of travel. Actually, the reversal in direction preferably creates an angle of about 45 between the initial direction of travel and the reversed direction of travel so that the suction roll 17 may be conveniently positioned above and behind the guide roll 16 but in a generally compact relationship with respect to the guide roll 16, the suction pickup roll 15 and the other elements of the paper machine generally included within the loop of the suction pickup felt 14.

This arrangement also permits the use of a single felt 14 at the suction pickup as well as the first suction press nip N-1.

As previously mentioned, the web W transfers to the plain surface of the roll 18 at the first press nip N1 and continues on the surface of the roll 18 through a second press nip N-2 defined with another roll 20 (above and ahead of the plain roll 18) and the web W is ultimately removed fro-m the plain-surfaced roll 18 by a doctor 21a as indicated in the drawing. The nip N-2 is downwardly inclined (about 80 from the horizontal) as shown in the drawing,- and the suction area 20a of the roll 20 is arranged so as to straddle the nip area of the second nip N-2. In this arrangement the suction area 20a extends an appreciable distance on the oncoming and on the offrunning side of the nip N-2 and the suction area 20a of the roll 20 is completely covered by a press felt 21 so that contact between the press felt 21 and the web W is made only at the nip area. The amount of felt covered suction area 20a at both the oncoming and the otfrunning sides of the nip N-2 is at least equal to the nip area and preferably is two or three times greater than the nip area. In other words, the nip area or actual pressure area in the nip N-2 whereat the web is actually pressed against the felt 21 may be a given length of perhaps one inch (peripherally), whereas the suction area covered by the felt 21 will extend on the oncoming side two, three or more inches from the actual nip area, and the suction area on the oncoming side is completely covered by the felt 21 at all times. In like manner, the suction area will ex-' tend two or three inches beyond the actual nip area at the offrunning side and will be entirely covered with the felt 21. This permits drying of the felt 21 and opening of the pores thereof at both sides of the nip so as to greatly improve the ability of the suction are-a 20a to dewater the web and remove water accumulating at the nip N-2. Also, the separation of the web W (adhering to the plain surface roll 18) and the felt 21 immediately at the offrunning side of the nip N2 serves to break a vacuum which tends to develop between the web W and the felt 21 and thus prevent a tendency to draw water through the nip N2. The suction rolls 17 and 20 are also equipped with save-alls 17b and 20b, respectively.

It will also be noted that the felt 21 passes under a guide roll 22 in a downwardly inclined plane (i. e. about 15 below horizontal).

Referring to Figure 2, it will be seen that the reference numeral 109 indicates generally a paper machine comprising a looped forming wire 111 whereon the web W is formed and the forming Wire 1111 travels over a subtion couch roll 112 with suction area 112a for dewatering the web W and then around a turning roll 113 to reverse the direction of the forming wire 111.

In the machine 1%, there is provided a looped pickup and press felt 114, a suction pickup roll 115 (with suction area 115a and a save-all pan 1151:) within the loop of thepickup felt 114 urging the pickup felt 114 against the web W on the formingwire-lll to transfer theWebW' to the underside of the pickup felt 114, and a guide roll 116 within the loop of the pickup felt 114 and cooperating with the suctionpickup roll 115 to define-a-downwardly inclined reach 114a of the pickup felt 114. The reach of the forming wire 111 contacted by the pickup felt 114 is downwardly inclined about 35 from horizontal and the first felt reach 114a of the pickupfeltllt is downwardly inclined about 22 in the direction of felt travel or the direction .of web travel.

Above the-guide roll; 116 there is positioned a reverse press, indicated generally by-P and the press P comprises a first suction press roll-117 presenting-a-suction area 117a within; the loop of thepickup and press 'felt 114, a plain-surfaced or bare roll 118 defining a first press nip N-11 with the first press roll 117, a press felt 121, and a second suction press roll 120 with a suction area 129a within the loop of the press felt 121 defining a second press nip N42 with the plain-surfaced roll 118. The press nip N-11 extends upwardly (being upwardly inclined from the horizontal about 35) and it is aligned angularly with respect to the first reach114a of the felt 114. A second reach 11% .of the felt 114 extends'upwardly to the press nip N-ll (being inclined about 83 from the horizontal) to guide the web W from the guide roll 116 upwardly to the nip N11. Here the first reach 114a and the second reach 114!) define an angle of approximately 60.

The first press nip -N11 is defined bya suction roll 117 having its suction area 1170 at the oncoming side of the nip N1 (and positioned above and behind the guide roll 116) and a plain roll 118 outside of the felt loop (and positioned above and ahead of the suction roll 117). The pickup felt 114 is also mounted on suitable guide rolls 122, 122 and the felt 114 is continuously passed through a dewatering press defined by an upper bare roll 123 and a lower suction roll 124 with appropriate suction area 1240 and save-all pan 124b.

At the first nip N-11 the wet web W is pressed against and caused to adhere to the plain-surfaced roll 11%. The wet web W continues to adhere to the plain-surfaced roll 118 at the otfrunning side of the nip N11 and passes on through the second nip N-12.

-As mentioned previously, the wet web adheres well when pressed against a plain-surfaced roll, but it does not ordinarily adhere well to a felt at least during a reversal of direction of the felt. In this instance, the suction pickup felt 114 is substantially reversed in direction around the guide roll 116 and means are provided for causing the wet Web W to adhere to the felt 114 as it is reversed in direction around the guide roll 116. Such means in this case include a suction gland 116a in the guide roll 116 which extends from approximately the point of contact p1 between the felt 114a and the roll 116 at the oncoming side to the point of contact p2 between the felt reach 11 1b and the roll 116 at the offrunning side. In this way the suction forces applied to the suction area 116a serve not only to assist in further dewatering of the felt and the web but also to retain-the web W on the felt 114. It will benoted'in this arrangement that Water is not drawn from a felt through the web, but rather from the web W through the felt 114. Because of the simplicity of operation and the added dewatering effect obtained (Without the necessity foremploying a press) the suction gland 116a affords a preferred means for retaining the web W on the felt 114 lapped about the guide roll 116, but it will be noted that the guide felt 19 of the embodiment also assistsin dewatering the web.

As previously mentioned, the web W transfers to the plain surface of the roll 118 at the first press nip N41 and continues on the surface of the roll 118 through a second press nip N-12 defined with another roll 120 (above and ahead of the plain roll 118) and the web the webW' is made only at the nip area.

W is ultimately removed from the plain-surfaced roll 118 by a doctor 121a as indicated in the drawing. :Actuallyythe doctor is used primarily to dispose of brok" during machine startup-and once the machine has been started up'the web W is sufficiently self-sustaining to strip itself from the plain-surfaced roll 118 and pass over the guide rolls 125 and126 and through a third n'ip N-13 defined by an upper plain-surfaced roll 127 and a lower suction roll 128 wrapped by a felt 129 mounted on guide rolls130 and 131. The suction roll (equipped with a suction area 128a) defines with the bare roll 127 a press nip N-13 whereat the top side of the felt is eX- posed to ,a bare surfaced roll. From the nipi-N-13"the web W passes downwardly to the dryer system indicated by the dryer roll132, felt133 and guide roll 134 in the usual manner. The press defined by the

rolls

127 and 128 can, of course, -be employed in the embodiment 1-0 after the second press nip N-2 in the m'anner herein described.

It is important, however, to note that the second nip N-12 is downwardly inclined (about 35 from the horizontal) as shown in the drawing, and the suction area 120a of the roll 120 is arranged so as to straddle the nip area of: the second nip N-12. As in the previous arrangement for the suction area 20a, the suction area 120a extends an apreciable distance on the oncoming and on the olfrunning side of the nip N12 and the suction area 120a is completely coveredby the press felt 121 so that contact between the press felt 121 and The amount vof felt covered. suction area 120a at both the oncoming and the cfirunning sides of the nip N412 is atlea st equal to .and-preferablygreater than the actual nip or pressure area. In actual practice it is two to aboutten times greater than the nip area (on each side). The felt 121 attheoffrunning sideof the nip N12 is looped abouta guide .roll 135 so as to define an oifrunning reach of the -feltr121 that is downwardly inclined (i. e. about 25 below horizontal).

:Referring to Figure 5, which shows the press nip arrangement between the

rolls

118 and 120, it will be seen that the oncoming sealing strip 1200 in suction roll 120 is spaced an angle a1 from the center of the nip N-12 of about 20 (and preferably within the range of 10 to 30); and the ofirunning sealing strip 120a is spaceda similar distance a-2 from the center of the nip N-12. The leading edge x of the save-all pan 1211b is spaced an angle a-3 of approximately 20 (and preferably 10 to 40) from the offrunning sealing strip 120d. In this way the leading edge x is in close running relation to the shell of the roll 120 and also in close running relation to the felt 121at the point where the felt 121 is separated from the roll shell (approximately opposite the-offrunning sealing strip 120d), so that the save-all pan 12% may receive as much water as possible which will be thrown from the roll shell by centrifugal force. Also, the incline of the felt 121 permits a corresponding incline to the bottom of the save-all pan 120b so thatcollec- .tion. of liquid 1 in the bottom of the pan may take place and the liquid 1 may be drawnoff from the bottom of the pan without spilling over onto the felt 121. The felt 121 is inclined downwardly from the horizontal an angle a-4 which is sufficient to permit adequate collection of the liquid .1 in the save-all pan 1211b and the angle a-4 may range from a practical minimum of about 15 to a practical maximum of about 70. Above 70 the felt'121 is running downwardly in a substantially vertical direction and forward progress through-the paper m chine cannot be accomplished. It will-be appreciated thatthepaper web must be continuously moved in the general forward direction of the paper machine and a substantilly vertical run of felt-will interfere with the forward movement of the web. For this reason the felt 121-is downwardly inclined an angle a-4 of 20 to 35 preferably. The downward incline of the felt 12], effects rapid separation of the felt from the shell of the roll 120 so that water thrown therefrom by centrifugal force will have to pass through the atmosphere (and can be caught in the save-all 12Gb). Preferably also the nip N-12 is downwardly inclined from the horizontal an angle a-S ranging from a minimum of about 20. to a maximum of about 75 (and the best results are obtained when n-S is 25 45), so that the felt 121, may be conveniently aligned in a plane generally tangential to the point on the roll shell opposite the offrunning sealing strip 120d. As an additional feature, it will be noted that a secondary save-all pan 120b maybe positioned beneath the felt 121 so as to catch any moisture which may be thrown from the felt 121. This is an additional feature which is possible in the instant press N-12, because the web W is separated from the felt 121 at the press nip N-12. In this respect the assembly of Figure differs from that of Figure 3.

Referring to Figure 3 which shows the assembly relating to the pickup roll 115, it will be noted that the wire 111 is inclined downwardly from the horizontal an angle a-6 of approximately 35, but this angle may be varied from approximately 20 to as much as 75, although it is preferably within the range of 2540. The oncoming 115a and offrunning 115d sealing strips in the roll 115 are spaced approximately an angle a-7 of 20, but may be spaced from to 30. In general the width of the suction area is not as great in the suction pickup roll at least for the high suction area which effects the actual pickup of the web W. The leading edge x of the save-all 115b is spaced an angle a-8 from the offrunning sealing strip 115d of about 20 and preferably within the range of 10 to 40 so as to be in close running relationship to the roll shell as well as the felt 114 and to receive water thrown by centrifugal force from the shell of the roll 115. The downwardly'inclined felt 114 with the web W therebeneath is inclined downwardly from the horizontal an angle a-9 of about 22, but this angle may range from a practical minimum of about (which permits suitable mounting of the save-all pan 115b and collection of liquid 1' therein) to a practical maximum of about 70 (above which no appreciable forward movement of the web W is accomplished). Preferably the angle a-9 is to 35.

Referring to Figure 4, it will -be noted that the transarea 117a which is mounted with the oifrunning sealing strip 117c substantially aligned with the center of the nip N-11 and the oncoming sealing strip 117d spaced about 20 therefrom (and preferably within the range of 10 to 30 It will be understood that modifications and variations may be effected without departing from the spirit and scope of the novel concepts of the present invention.

We claim as our invention:

1. In a paper machine, a looped felt, a suction roll within the loop of said felt with a suction area covered by the felt, a supporting member having a foraminous surface carrying a wet web thereon and urging the web against the felt covered suction area, means guiding said felt away from the suction area in a downwardly inclined plane, and a save-all pan interposed between the suction roll and the felt in close running relation to the suction area on the oifrunning side thereof.

2. In a paper machine, a looped felt, a "suction troll within the loop of said felt with a suction area covered by the felt, a supporting member having a foraminous surface carrying a wet web thereon and urging the web again-st the felt covered suction area, means guiding said felt away from the suction area in a downwardly inclined plane about 15 to 70 from horizontal, and a save-all pan interposed between the suction roll and the felt in close running relation to the suction area on the offrunning side thereof presenting a leading edge about 10 to 40 behind the suction area.

3. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said felt with a suction area covered by the felt, a forming wire carrying a wet web thereon and urging the web against the felt covered suction area, and means guiding said felt away from [the suction area in a downwardly inclined plane.

"4. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said felt with a suction area covered by the felt, a forming wire carrying a wet web thereon and urging the web against the felt covered suction area, means guiding said felt away from the suction area in a downwardly inclined plane, and a save-all pan interposed between the suction roll and the felt in close running relation to the suction area on the offrunning side thereof.

5. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said felt with a suction area covered by the felt, a couch roll, a forming wire having a downwardly inclined reach traveling over and supported by said couch roll and said turning roll, said formingwire carrying a wet web thereon and urging the web against the felt covered suction area, means guiding said felt away from the suction area in a downwardly inclined plane, and a save-all pan interposed between the suction roll and the felt in close running relation to the suction area on the oifrunning side thereof.

6. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said pickup felt urging said pickup felt against a wet web on a forming wire to transfer the web to said pickup felt, a guide roll lapped by and within the loop of said pickup felt and cooperating with said suction roll to define a downwardly inclined reach of pickup felt therebetween, and means associated with said guide roll and the pickup felt lapped thereby for holding the web on said pickup felt as it travels around said guide roll.

7. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said pickup felt urging said pickup felt against a wet web on a forming wire to transfer the web to said pickup felt, a guide roll lapped by land within the loop of said pickup felt and cooperating with said suction roll to define a downwardly inclined reach of pickup felt therebetween, and a suction box in said guide roll lapped by said suction pickup felt for holding the web on said pickup felt as it travels around said guide roll.

8. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said pickup felt urging said pickup felt against a wet web on a forming wire to transfer the web to said pickup felt, a guide roll lapped by and within the loop of said pickup felt and cooperating with said suction roll to define a downwardly inclined reach of pickup felt therebetween, and a guide felt also lapping said guide roll urging the web against said pickup felt for holding the web on said pickup felt as it travels around said guide roll.

9. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said pickup felt urging said pickup felt against a web on a forming wire to transfer the web to said pickup felt, a guide roll within the loop of said pickup felt and cooperating with the suction pickup roll to define a first reach of said pickup felt thereb-etween, a pair of press rolls defining a press nip therebetween that is aligned angularly with respect to said first reach, a second reach of said felt feeding to said nip and extending therefrom to said guide roll, a second felt, and guide rolls for saidsecond felt posi- 'tioned closely adjacent said first and second reaches of 9 said pickup felt and urging said second felt against the web guided by said pickup felt.

10. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said pickup fellt urging said pickup felt against a web on a forming Wire to transfer the web to said pickup felt, a guide roll within the loop of said pickup felt and cooperating with the suction pickup roll to define a first downwardly inclined reach of said pickup felt therebetween, a suction roll Within the felt loop and a plain roll outside the felt loop defining an upwardly extending press nip therebetween, said suction roll being positioned above said guide roll with an upwardly extending second reach of said pickup felt extending therebetween, a second felt, and guide rolls for said second felt positioned closely adjacent said first and second reaches of said pickup felt and urging said second felt against the web guided by said pickup felt.

11. In a paper machine, a first guide roll, a traveling first felt lapped thereover and presenting a downwardly inclined reach at the oncoming side of said first roll and a generally upward reach at the oifrunning side of said first roll for guiding and supporting from above a paper web on said inclined reach, around said first roll and on said upward reach, a traveling second felt covering the Web on said first felt around said first roll, a second guide roll lapped by the second felt and urging the second felt against said inclined reach to retain the web thereon and a third guide roll lapped by the second felt and urging the second felt against said upward reach to retain the web thereon.

12. In a paper machine, a first guide roll, a traveling looped first felt lapped thereover and presenting a downwardly inclined reach at the oncoming side of the first guide roll and an upwardly running reach at the offrunning side of the first guide roll, said reaches defining an angle of 30 to 80, a suction press roll within the felt loop and above said first guide roll defining a press nip with another press roll receiving said upwardly running reach, and a second felt urged by other guide rolls against a web carried on said inclined reach, on the first felt around said first guide roll and on said upwardly running reach up to said nip.

13. In a paper machine, a looped pickup felt, a suction pickup roll within the loop of said pickup felt urging said pickup felt against a web on a forming wire to transfer the web to said pickup felt, a guide roll within the loop of said pickup felt and cooperating with the suction pickup roll to define a first reach of said pickup felt therebetween, a pair of press rolls defining a press nip therebetween that is aligned angularly with respect to said first reach, a second reach of said felt feeding to said nip and extending therefrom to said guide roll, and means associated with said guide roll and the pickup felt lapped thereby for holding the web on said pickup felt as it travels around said guide roll.

14. In a paper machine, a looped pickup felt, a suc tion pickup roll within the loop of said pickup felt urging said pickup felt against a Web on a forming wire to transfer the web to said pickup felt, a guide roll within the loop of said pickup felt and cooperating with the suction pickup roll to define a first reach of said pickup felt therebetween, a pair of press rolls defining a press nip therebetween that is aligned angularly with respect to said first reach, a second reach of said felt feeding to said nip and extending therefrom to said guide roll, and a suction box in said guide roll lapped by said suction pickup felt for holding the web on said pickup felt as it travels around said guide roll.

15. In a paper machine, a looped pickup felt, a suction pickup roll having a suction area within the loop of said pickup felt urging said pickup felt against a web on a forming wire to transfer the web to said pickup felt, a guide roll within the loop of said pickup felt and cooperating with said suction roll to define a downwardly inclined reach of said pickup felt at the Qfiillflning side 10 ofv said suction area, a first suction press roll; withinthe loop of said pickup felt, a plain-surfacedroll defining a first press nip with said first press roll, a press felt and a second suction press roll within the loop of said press felt defining a second press nip with said plain-surfaced roll.

16. In a paper machine, a looped pickup felt, a suction pickup roll having a suctionarea withinthe loopcf said pickup felt urging said pickup felt against a web on a forming wire to transfer the web to said pickup felt, a guide roll within the loop of said pickup felt and cooperating with said suction roll to define a downwardly inclined reach of said pickup felt at the oifrunning side of said suction area, a first suction press roll within the loop of said pickup felt, a plain-surfaced roll defining a first upwardly inclined press nip with said first press roll, a press felt and a second suction press roll within the loop of said press felt defining a second downwardly inclined press nip with said plain-surfaced roll.

17. In a paper machine, a looped pickup felt, a suction pickup roll having a suction area within the loop of said pickup felt urging said pickup felt against a web on a downwardly inclined reach of forming wire to transfer the web to said pickup felt, a guide roll beneath and ahead of said suction roll in the general direction of web travel and within the loop of said pickup felt and cooperating with said suction roll to define a downwardly inclined reach of said pickup felt at the offrunning side of said suction area, a first suction press roll above and behind said guide roll and within the loop of said pickup felt, a plain-surfaced roll above and ahead of said first press roll and defining a first press nip with said first press roll, a press felt and a second suction press roll above and ahead of said plain-surfaced roll and within the loop of said press felt defining a second press nip with said plain-surfaced roll.

18. In a paper machine, a looped pickup felt, a suction pickup roll having a suction area within the loop of said pickup felt urging said pickup felt against a web on a forming wire to transfer the web to said pickup felt, a first suction press roll within the loop of said pickup felt, a plain-surfaced roll above and ahead of said first press roll and defining a first press nip with said first press roll, a press felt, a second suction press roll above and ahead of said plain-surfaced roll and within the loop of said press felt defining a second press nip with said plain-surfaced roll, said second press roll having a suction area straddling said press nip completely covered by said press felt, and means guiding said press felt away from said suction area in a downwardly inclined plane.

19. In a paper machine, a looped felt, a suction roll within the loop of said felt with a suction area covered by the felt, a plain-surfaced roll carrying a wet web thereon and urging the web against the felt covered suction area and means guiding said felt away from the suction area in a downwardly inclined plane.

20. In a paper machine, a looped felt, a suction roll within the loop of said felt with a suction area covered by the felt, a plain-surfaced roll carrying a wet web thereon and urging the web against the felt covered suction area, means guiding said felt away from the suction area in a downwardly inclined plane, and a save-all pan interposed between the suction roll and the felt in close running relation to the suction area on the oifrunning side thereof.

21. In a paper machine, a looped felt, a suction roll within the loop of said felt with a suction area covered by the felt, a plain-surfaced roll carrying a wet web thereon and urging the web against the felt covered suction area to define a downwardly inclined press nip lying in a plane tangential to both rolls, said suction area extending through and beyond the nip on both the on-coming and off-going sides of said nip, said felt lapping the entire suction area and engaging the web retained 11 12 on the plain roll sulface only at said nip, and means 2,111,834 Berry Mar. 22, 1938 guiding said felt away from the suction area in a down- 2,204,426 Millspaugh June 11, 1940 wardly inclined plane. 2,694,348 Beachler Nov. 16, 1954 2,732,772 Hornbostel Jan. 31, 1956 References Cited in the file of this patent 8 2,797,623 Stewart July 2, 1957 7 UNITED STATES PATENTS 1,483,961 Wilson et a1 Feb. 19, 1924