US2443352A

US2443352A - Suction press section for paper machines

Info

Publication number: US2443352A
Application number: US525978A
Authority: US
Inventors: Hornbostel Lloyd
Original assignee: BOLOIT IRON WORKS
Current assignee: BOLOIT IRON WORKS
Priority date: 1944-03-11
Filing date: 1944-03-11
Publication date: 1948-06-15
Anticipated expiration: 1965-06-15

Description

June 15, 1948. 1., HORNBOSTEL A I SUCTION PRESS SECTION FOR PAPER MACHINES I41 YE 2-1 a L 1. 0 r0 floewao srsl.

Filed larch 11, 1944 Patented June 1948 UNITED s'rAras "PAT T. I SUCTION engagi g: roa mean I 'Lloyd'liornbostel, Beloit, Wis to'iuloii Iron Works, cousin Beloit, Wis, a corporationof Wh-.

8, Claims.

This invention relates chine that is particularly adapted for the production of the soft tissue types or paper. and it relates more specifically to the press section of a paper making machine of the Fourdrinier type.

It is one of the principal objects of this invention to simplify the construction of the press section of a paper making machine such as conabove about 30 to 50 lbs. per lineal inch would effect undesired transfer of the web from its top or carrying felt.

In the present arrangement of the paper making machine the paper is first subject to high couch roll suction on the forming wire in advance of the transfer point to the press section so that a drier sheet is fed to the transfer point. The transfer from the wire to the top felt is efiected by means of an upper transfer suction roll having separate high and low suction passageways, said transfer roll being disposed in coto a paper making ma- 2 roll assembly. The relationship of the twofelts will become reversed as the plies approach the nip of this second press assembly. The paper then is sucked onto the inverted top first felt operative relation to a plain couch roll that is in the looped end of the wire beyond the primary suction couch roll. The high suction area of the transfer roll is effective upon the superposed plies of felt and paper preferably immediately after they have passed the nip of the transfer assembly, and this is followed by the action of the low suction area of said roll holding the paper on the felt, with the result that the drier sheet from the couch roll is further dried and the major portion of the liquid is thus initially removed from the paper before the press section. Thus when the covered paper subsequently is subjected to the squeezing actions of the press roll assemblies in the press section there is less liquid to remove therefrom, and the pressure exerted by these assemblies may be increased so that even the first press can be operated under efficient extracting loads several times that above mentioned, or to approximately 150 lbs. perlineal inch of nip,

The bottom or second felt (or covering ply) is received by the paper at the first press assembly and the two felts together with the interposed paper are trained upward and around a heated upper roll forming a component of a second press while the covering or bottom second felt, which is now uppermost at the lower segment of the heated roll, is withdrawn so that the paper will thereafter travel with the original top felt to a Yankee drier drum.

It will be seen that by reason of this novel arrangement, pressures that are much higher than it has been heretofore possible to use maybe employed thereby effecting a considerable sav-. ing of drying-time and expense. The machine is less expensive to build due to the fact that it is possible to reduce the number of thepress roll assemblies as well as the drying capacity of the drier section thereby effecting a compact disposition of its components. Such a machine 0c? cupies less floor area in a mill.

Additional aims and advantages of this invention will be apparent to persons skilled in the art after an understanding of itsconstruction and operation from the following description.

. It is preferred to practice this invention in substantially the manner hereinafter described in I detail and as more particularly pointed oiit in the claims. Reference is now made to the ac companying drawings, that form a part of this specification, in which,

Figure 1 is a diagrammatic side elevational view of the press section of a paper making machine embodying the instrumentalities of the present invention;

Figure 1A is a fragmental somewhat diagrammatic vertical cross sectional view of the transfer roll assembly of Fig. 1;

Figure 2 is a diagrammatic sectional view-of", an electric heat applicator such as employed here in; and Figure 3 is a diagrammatic sectional view showing a modified heat applicator employing hot air,

steam or other medium.

The press section shown in Figure 1 comprises .an overhead support 5 and ashelf 8 disposed in a lower horizontal plane than the overhead support. The overhead support is carried upon the upper ends of columns 1 and one end thereof,

which adjacent the shelf 6, is spaced therefrom and is trained around a plain couch roll that is a part of a suction transfer assembly at the adjacent end of the press section of the machine. The plain couch roll i3 is journaledin suitable hearings on the columns I and it extends across the width of the press section. The suction transfer roll ll of the assembly is journaled in suitable bearings depending from pivoted arms ii. that have their fulcrums l6 mounted in the columns above the plain couch roll II. For the purpose of exerting pressure at the nip of this assembly the free or movable ends of the arms l are connected to suitable plungers l8 that are pivotally mounted in dependinglugs I! on the overhead support 5. The top or carrying felt I8 is trained upon the suction transfer roll II and is adapted to pick up the paper from the wire H at the nip of the rollers i3 and H.

The suction transfer roll H is provided with suction areas I9 and that are preferably alongside each other and arranged substantially in the manner shown in Figures 1 and 1A, wherein it will .be observed the area I! extends from the nip and constitutes the high suction transfer area. The other area 20 is provided with a pivoted or butterfly valve 2| that controls-the suction therethrough so that said area 20 constitutes a controlled low suction paper holding area. This arrangement establishes a differential of suction between the respective areas it and 20 wherein a relatively narrow high vacuum area extending from the nip between rolls i3 and i4 effects transfer of the paper from the forming wire ii to the top or carrying felt l8 and a wide lower vacuum area holds the paper on the felt to insure a clean and complete transfer.

At the opposite end of the press section there is a large Yankee drier drum 22 that has its trunnions journaled in bearings 23 secured to the top of the shelf 6. A suction press roll 24 yieldably opposes a portion of the lower segment of the dryer drum 22 and has its suction box 25 located at the nip of this drier assembly. Suction press roll 24 is journaled in suitable bearings 26 that arise from pivoted arms 21 having their fulcrums on the columns 9, the ends of said arms opposite the fulcrums being supported and urged in an upward direction by suitable plungers 23.

A plurality of suction press roll assemblies are imposed between the above described assemblies that are at opposite ends of the press section of the machine as shown in Figure 1. The first of these press roll assemblies comprises a suction press roll 29, the ends of which are journaled in suitable bearings 30 arising from the floor and has its suction box 3i positioned in its uppermost segment in opposition to a press roll 32 so that the suction is exerted in a downward direction instead of having to lift the liquid that is withdrawn from the paper and felt plies. Suitably pivoted L-shaped arms 33 have pendent bearings 34 for journaling the ends of the press roll 32 of this assembly, the said arms being fulcrumed at their pivoted ends in bearings 35 and also have their opposite free ends urged in a downward direction by plungers 36. Suitable hangers 31 depending from the overhead support 5 carry the journals for the arms 33 and have the plunger 36 pivotally connected thereto.

The second suction press roll assembly com prises a suction press roll 38 that is opposed by a heated drier roll 39 that is Journaled in 'bearings 40 depending from the overhead support 5. Bearings 4| journal the ends of the suction press roll 38, said bearings arising from swinging arms I 4 42 that have their fixed ends Journaled in bearings in the upper ends of short posts arising from the floor. The movable or free ends of the arms 42 are supported by the upper ends of plungers 44 that urge said arms upward and press the suction roll 33 against the lowermost segment of the heated drier roll 39.

[The top felt I! after picking up the paper at the nip of the transfer assembly rolls l3 and ll,

. is also trained through the nip between the first press roll assembly. The paper is thus covered upon both of its surfacesby the respective top felt l8 and bottom felt 35. .These three plies are trained upward, over and around the major portion of the heated drier'roll I9 and after passing the nip between the drier roll 39 and suction press roll 38, the bottom felt, which is now uppermost, is withdrawn by passing it over an idle roller 48, the upper segment of which is tangent to and in substantially the same horizontal plane as the nip of the second press roll assembly which the plies have just'left. This bottom felt 66 is now trained downward over an idle roll 49 from which it is returned to a pair of wringer rolls db and 4? to repeat its, travel as above described.

The top felt which, as before stated, has been in reversed relation to the bottom felt at thenip of the dryerpress roll assembly wand 39, is now moved in a diverging path away from the withdrawn bottom felt by being trained to an idle roll 5il that permits the top felt and paper to move in an outward direction away from the bottom felt 45 and the idle roll 38. The top felt upon leaving the idle roll 50- will again be disposed in its initial position above the paper sheet and these plies are adapted to travel in a horizontal plane beneath the second or dryer roll assembly and move toward the right end of the machine where the plies are trained on an idle roller iii to direct them to the nip of the Yankee drier assembly.

After the top felt passes the nip of the Yankee drier assembly it is withdrawn from the paper that is now in contact withthe drier drum 22 and said top felt is trained around an idle roller 52 carried by the overhead support 5. The paper on the Yankee drier drum 22 continues thereon throughout a major portion of the circumference of said drum and it is removed therefrom by the doctor 53.

, Above the overhead support there are guide rollers 54 and 55 that direct the top felt it to a pair of

wringer rolls

56 and 51! mounted upon the top of the overhead support 5 and the top felt then is trained around

guide rollers

58 and 59 and an intermediate tension roller 50, and thence back to the transfer assembly.

When the paper on the wire it is transferred from the wire ii to the top felt it, it has already been subjected to high vacuum water extraction by the primary couch roll i2 and it is further subjected to the high suction at the area i9. This high suction is followed by the lower suction through the controlled area 20 in the suction transfer roll 14. A large percentage of the moisture will thus be withdrawn or sucked from the paper before it enters the press section of the machine. first press roll assembly-to receive the bottom felt at the nip of this press assembly, the major portion of the moisture has been withdrawn. As

Hence when thepaper arrives at the' a result of this arrangement, the pressure that may be dependably exerted against the paper and the two felts on this first of a plurality of press assemblies may be materially increased several times the pressure heretofore generally employed 7 in the press section of a paper making machine.

- suction press roll 38 upon its original top felt l8.

By reason of this arrangement of the suction areas, the rolls may be disposed at the most effective locations and high pressures may be used and always insure the original top felt receiving the paper when the bottom felt 45 is withdrawn by the roller 48. It also will be seen that the primary suction couch roll i2 is followed by the transfer roll assembly which comprises a lower a plain roll l3 and an upper cooperating suction roll that renders it possible to feed a much drier sheet to the transfer roll and it eliminates the necessity of high suction capacity in the suction press rolls to such or lift the water.

During transit of the paper and top felt through the lower straight run to the heated drum assembly and prior to reaching the nip of the Yankee drier assembly the paper and felt are heated. The paper and felt may be heated in any suitable manner, such for example, as electrostatically by passing the paper and felt between a pair of closely spaced plates ti and 62 which are connected to the output of a source 63 of high frequency alternating current. The electrostatic stress in the paper and felt will be periodically reversed, resulting in both a dielectric loss and a resistance loss which raises the temperature thereof. This type of heater is illustrated in Figure 2.

Another type of heater, illustrated in Figure 3, comprises a metal radiator 65 having a hollow interior be into which steam heat or air or other heating medium is fed through inlet pipe 8'! and withdrawn through outlet pipe 68. In this type of heater as in the one shown in Figure 2 paper and felt are close to but out of contact with the walls of the radiator-8t.

Vfhlle this invention has been described in detail in its preferred form or embodiment, it will be apparent to persons skilled in the art, after understanding the improvements, that various changes and modifications may be made therein without departing from the spirit or scope thereof. It is aimed in the appended claims to cover all such changes and modifications.

I claim as my invention:

1. In a paper making machine having a looped V forming wire trained around a plain end roll, a

suction couch roll within the loop of said wire acting through the wire in advance of said plain end roll for dewatering a web on the wire en route to the plain end roll, a suction transfer roll in pressure nip relation with said plain end roll, a press roll assembly beyond the transfer roll, a drier" drum beyond said press roll assembly, a single looped top felt trained around said transfer roll through said nip. through said press roll assemblyand against said drier drum, said transfer roll having a high suction area extending from the nip to a point beyond the nip to transfer the web from the wire to said top felt, and said transfer roll also having a low suction area extending from the high suction area to a point where said top felt leaves the transfer roll en route to the press roll assembly for holding the web on the underface of said top felt.

2. In a Fourdrinier type paper making machine having a looped forming wire trained around an end roll to define an upper forming run for a fibrous web. a primary suction couch roll within the loop of said wire and having a high vacuum area acting through the upper runof the wire for materially dewatering a web on said upper run before the web reaches said end roll, a first looped felt adjacent the end roll, a suction transfer roll in the loop of said first felt in pressure nip relation with said end roll, a heavily loaded suction press spaced from said transfer roll and having a roll within the loop of said first felt to receive the felt through the nip thereof, a second looped felt trained around another roll of said suction press to cover the web on thefirst felt as it passes through the nip of the press, said transfer roll having a high suction area extending from the nip between the transfer roll and roll receiving the forming wire therearound to a point beyond the nip effective for transferring a web on the upper run of the wire to the first felt, said transfer roll also having-a low suction area separated from said high suction area and extending therefrom to a point where the first felt leaves the transfer roll en route to the suction press and effective to hold said web on the underface of the first felt to maintain a clean and complete transfer of the web onto the first felt for travel therewith in uncovered condition until it is covered by the second felt and subjected to heavy pressure in said suction press, a drier drum beyond said suction press, and a suction roll within the loop of said first felt for transferring the web to the drum wherebya single looped felt conveys the web from. the forming wire through the suction press to the drier drum.

3. In a paper making machine having a looped forming wire trained around a plain end roll, a suction couch roll within the loop of said wire in advance of said plain end roll, said suction couch roll having a high vacuum area acting through the upper run of the wire for dewatering a web of paper en route to the plain end roll, a suction transfer roll in pressure nip relation with said plain end roll, first and second suction presses arranged in succession beyond said transfor roll, a top felt trained through the nips of said suction presses and suction transfer roll for conveying a web from the forming wire through the suction presses, each of said suction presses having a bottom suction roll and a cooperating top roll, said top felt being trained around the top roll of the second suction press en route from the nip of the first suction press to the nip of the second suction press for passing through the nip of the second suction press in a reverse direction underneath the web, a covering felt trained through the nips of the presses with said top felt and overlying the top felt in the nip of the second suction press, said suction transfer roll having a suction nip for transferring the web from the wire to the top felt to be supported on the top felt until it is passed through the nip of the first press and covered by said covering felt.

and the suction nip of the second press being felt, said press section havingfirst and second suction presses each equipped with a bottom suction roll and a top cooperating roll, the top roll of the first press being within the loop of said looped felt, the top roll of said second press being outside of the loop of said looped felt and receiving the felt therearound, a web covering felt trained with said loopedffelt through the nip of the first press around the top roll of the second press and through the nip of said second press, said covering felt being under the looped felt in the nip of the first press and over the looped felt in the nip of the second press, said suction roll of said second press acting through said looped felt to maintain the web thereon for travel therewith, another-roll in the loop of said looped felt coacting with the drier section for transfer of the web on the looped felt'into said drier section, and means for heating the looped felt along the run thereof between said second P ss and drier section. v

5. A suctionpress assembly comprising a firstsuction press having-a bottom suction roll and a cooperating top roll, a second suction press hav ing a bottom suction roll and a cooperating-top roll, a looped top felt arranged to convey a fibrous web on its underface through the hip or said first press, said top felt being trained around said top roll of the second press and through the nip of the second press in a direction reversed from its direction of travel through the nip of the first press whereby a w'eb'tl'iat is on the underface of said top felt in the first press will be on the top face of saidtop felt in said-second press, and a covering felt traveling with said top felt through said presses for protecting the web whereby suction in the first press tends to trans- I back to the top felt.

6. A suction press assembly comprising a first suction press includinga suction roll and a cooperating roll in pressure nip relation therewith, a second suction press including a suction roll and a heated roll cooperating therewith to define a pressure nip, 9. looped top felt, said cooperating roll of the first press being within the loop of said top felt, said cooperating heated roll of the second press being outside of the loop of the top felt and receiving the felt therearoupd to travel through the nip of the second press in a direction reversed from the direction of travel through the nip of the first press, a transfer roll within the loop of the top felt in advanced relation to the first press for pickin up a web of paper on the underface of the top felt to be conveyed thereby through the first press and thence around the heated roll through the nip of the second suction press with suction in said nip acting through the felt to retain the web on the felt.-

. LLOYD HORNBOS'I'EL REFERENCES CITED I The following references are of record in the file of this'patent:

UNITED STATES PATENTS Number Name Date 6 1,568,363 Cathcart Jan, 5, 1926 1,626,766 Tompkins May 3, 1927 1,701,226 Collins Feb. 5, 1929 1,856,546 -Farnsworth May 1'7, 1932 2,042,145 -Darrah May 26, 1936 4 2,144,770 Millspaugh Jan. 24, 1939 2,174,744 Hill Oct. 3, 1939 2,204,426 Millspaugh June 11, 1940 2,209,758 Berry July 30, 1940 2,209,760 Berry July 30, 1940 2,209,761 Berry July 30, 1940 2,338,465 Street Jan. 4, 1944 2,340,103 Berry Jan. 25, 1944 FOREIGN PATENTS Number Country Date 15,127 Great Britain 1903 8,636 Great Britain 1911 499,657 Great Britain Jan. 26, 1939 REFERENCES