US2209757A - Felt arrangement for horizontal press roll assemblies - Google Patents

Description

y 30, 1940- I r E. E. BERRY 2,209,757

FELT ARRANGEMENT FOR HORIZONTAL PRESS ROLL ASSEMBLIES Filed May 20, 1936 4 Sheets-Sheet '1 .ZZ/dF-fierzy 30, 1940. BERRY 2,209,757

FELT ARRANGEMENT FOR HORIZONTAL PRESS ROLL ASSEMBLIES Filed MayZD, 1936 4 Sheets-Sheet '2 W Z ZIf/ZZBQW,

y 30, 1940- E. E. BERRY 2,209,757

FELT ARRANGEMENT FOR HORIZONTAL PRESS ROLL ASSEMBLIES Filed May 20, 1936 4 Sheets-Sheet 3 ME ,7 U Ear/Z1562 July 30, 1940. BERRY 2,209,757

FELT ARRANGEMENT FOR HORIZONTAL PRESS ROLL ASSEMBLIES Filed May 20, 1936 4 Shets-Sheet 4 EMEUZUE ar AZf-Eer/y Patented July 30, i940 UNITED STATES PATENT OFFICE Earl E. Berry, Beloit, Wis., assignor to Beloit Iron Works, Beloit, Wis., a corporation of Wisconsin Application May 20, 1936, Serial No. 80,763

2 Claims.

This invention relates to horizontal press roll assemblies for paper machines including felt or carrier band arrangements therefor.

More specifically this invention relates to horizontal press roll assemblies having a center roll which may or may not be heated and rolls of the plain or suction type pressed against the center roll and includes several arrangements for a looped carrier felt to direct the wet webs of paper through the assemblies.

In my copending application entitled: Horizontal press roll assembly, filed'May 18, 1936, Serial No. 80,253, there is described and claimed structure for horizontal press roll sections of paper machines. The structures described there in can be used in the press roll arrangements of this invention which arrangements will be herein illustrated in a diagrammatic form.

The present invention provides horizontal press roll sections equipped with only a single felt for conveying a wet web of paper through the sections. Another feature of this invention includes the use of a heated roll in the assembly to reduce the viscosity of water in the paper web and felt thereby making possible a freer extraction of water from the web. 7

It is then an object of this invention to provide a horizontal press roll assembly with a single felt for directing a web of paper through the assembly.

Another object of this invention is to provide a heated press roll assembly for paper machines.

A further object of this invention is to provide a press roll assembly containing three rolls in horizontal relation with the center roll adapted to be heated and at least one of the side rolls provided with a suction head. i

A further object of this invention is to provide a horizontal press roll assembly with various felt arrangements for handling all calipers and weights of paper. v

Still another object of this invention is to extract larger amounts of water from wet soggy webs than was heretofore possible without stretching or crushing the web.

Another object is to eliminate the long draw for paper webs heretofore necessary between the couch roll and press roll section of a paper machine. I

Another object of this invention is to reduce the viscosity of water in a wet paper web during a water extracting operation.

Other and further objects of this invention will become apparent-from the following detailed description of the annexed sheets of drawings which disclose preferred embodiments of the invention.

On the drawings:

Figure 1 is a diagrammatic side elevational view of a press roll assembly according to this invention mounted between the couch roll and drier section of a paper machine and having a suction roll adjacent the couch roll and a plain press roll adjacent the drier section.

Figure 2 is a diagrammatic side elevational view of another form of press roll assembly according to this invention mounted between the couch roll and drier section of a paper machine and equipped with two suction press rolls and a single looped felt for directing the paper webs from the couch roll through the assembly.

Figure 3 is another diagrammatic side elevational view of a modified form of press roll assembly according to this invention mounted between the web forming and drier sections of a paper machine and having a heated center roll.

Figure 4 is a diagrammatic side elevational view of a press roll assembly according to this invention having a single looped felt disposed around the rolls of the assembly over the assembly and also having a, heated drum as the center roll for the assembly.

Figure 5 is another diagrammatic side elevational view of a modified form of press roll assembly according to this invention mounted between the couch roll and a large drier drum of a Yankee type Fourdrinier machine with a single felt for conveying the web from the couch roll through the press roll section to the drier drum.

Figure 6 is a diagrammatic side elevational view'of a modified form of press roll assembly for use in a Yankee type Fourdrinier machine as illustrated in Figure 5.

Figure 7 is another diagrammatic side elevational view of a press roll assembly according to this invention for use on a Yankee type Fourdrinier machine showing a modified form of felt arrangement for directing the paper web through the assembly.

Figure 8 is another diagrammatic side elevational view of a press roll assembly according to this invention and having an inner felt for protecting the paper web as it passes around the center roll of the assembly.

I 'As shown on the drawings:

In Figure 1, the reference numeral l0 indicates a forming wire having a web W formed thereon. The forming wire Ill is trained around a suction couch roll II a suction head Ila for removing water from the web W as it passes thereover. The web W after passing over the suction head IIa of the couch roll II leaves the forming wire I0 and is directed under a guide roll I2 onto a carrier felt I3.

The carrier felt I3 with the web W thereon is trained over a suction roll I4 having a suction head I4a mounted in advance of the roll I4 and a center roll I5. As the web and felt pass over the suction head I4a of the suction roll I4 water is removed therefrom by suction. As the web and felt then advance through the nip of the rolls I4 and I5 additional water is removed from the web by pressure. This water is simultaneously removed from the nip into the suction head.

The web W and felt I3 pass around the bottom portion of the center roll I5. with the web contacting the periphery of the center roll. The web and felt then pass up through the nip of the center roll I5 and a plain press roll I6 in peripheral pressure relation with the center roll I5. The felt I3 is then separated from the web and passes around the plain press roll I6. The web alone then passes through the nip of the center roll I5 and a smoothing roll I1 mounted above the center roll where the web is ironed out and felt marks removed from the surface thereof. The web follows around the smoothing roll I! into the drier drum section I8 of the machine.

Wiping devices I51; and I'Ia. respectively contact the peripheries of the center roll I5 and the smoothing roll I! to remove water and foreign material therefrom.

The center roll I5 is stationarily but rotatably mounted on a base I9 which base I9 pivotally carries standards and 2| for pivotally supporting the suction roll I4 and the plain press roll I6 respectively. It is thus obvious that the suction roll and the plain press roll can be swung about their-pivot points in and out of pressure relation with the center roll I5.

Feet 200. and 2 I a are provided on the standards 20 and 2I to limit the backward movement of the suction roll I4 and press roll I6 away from the center roll I5.

The single carrier felt I3, which is trained over the suction roll I4, under the center roll I5 and over the plain press roll I6 is also trained around a tensioning roll 22 for maintaining the felt in a proper taut condition, and over guide rolls 23 and 24 located adjacent to the couch roll II for directing the felt into close relationship with the couch roll so that the web W will not have a long draw between the couch roll and the press roll assembly.

One of the standards 20 for the suction roll I4 has a manifold suction head communicating with a vacuum pump for evacuating the suction head I 40 in the roll.

In Figure 2 parts identical with those described in Figure 1 have been marked with the same reference numerals and need not be further described.

However, in Figure 2 a second suction press roll 25 having a suction head 25a is used in place of the plain press roll I6 described in Figure 1. Furthermore, the felt I3 after passing under the center roll I5 is directed away from the web W around a guide roll 26 which directs the felt alone over the suction head 25a of the suction roll 25 where water is removed from the felt before it re-contacts the web W as the web and felt pass through the nip of the rolls I5 and 25. In this manner the suction head 25a serves to dry the felt so that it can readily absorb water from the web as the water is squeezed out of the web by its passage through the nip of the rolls I5 and 25.

The suction roll 25 is supported on standards such as 21 one of which has a manifold chamber therein in communication with a vacuum pump (not shown) for evacuating the suction head 25a of the roll.

After passing through the nip of the rolls I5 and 25 the web W is directed over a guide roll 28 and then through a pair of wringer or smoothing rolls 29 into the drier section I8.

The second suction press of the assembly shown in Figure 2 acts as a felt conditioner, opening up the pores of the felt and making it readily receptive for the absorption of water squeezed from the web. If desired, a smoothing roll can be mounted either against thetop of the center roll I5, or against the bottom of the center roll, or against both the top and bottom of the center roll. 1

In Figure 3 the reference numeral 30 indicates a Fourdrinier forming wire having a web W formed thereon. The wire 30 is trained around a suction couch roll 3I over a suction head 3Ia therein. A top carrier felt 32 is disposed over the forming wire 30 and directed under a top couch roll 33 cooperating with the couch roll 3I to transfer the web W from the wire 30 to the felt 32.

If the web W is a light-weight paper such as a tissue, the felt 32 conveys the web as shown in solid lines over a suction roll 34 of the press section having two suction heads 35 and 36. The web under the felt 32 contacts a second felt 3'I trained around the suction roll 34 before the same reaches the suction area defined by the suction head 35 of the roll. The web then passes between the felts 32 and 3'! over the suction head 35 where water is removed by the combined action of suction and squeezing provided by a top roll 38 acting against the suction roll 34. The felt 32 is then removed from the web W around the roll 38.

The web W- is then carried by the felt 31 over the suction area defined by the suction head 36 of the suction roll 34 and through the nip of the suction roll 34 and a heated center roll'39 where additional water is removed by combined action of pressure and suction.

The web and felt 31 then travel around the roll 39 where the same are heated by the roll to reduce the viscosity of water entrained therein. The felt 3'! is then separated from the web W and passes around a guide roll 40 and upward therefrom into contact with a second suction roll 4I having a suction head 4Ia for sucking water from the heated felt. The felt then re-contacts the web W on the center roll 39 as the web and felt pass through the nip of the roll 39 and the suction roll H where water is readily squeezed from the web since its viscosity is reduced by heating and the thus extracted water immediately absorbed by the dried felt.

The felt 31 travels around the suction roll M and the web W follows the center roll where it is removed therefrom by a scraper 42 to crepe the web.

The contacting of the web W with the heated periphery of the center roll 39 after the web is separated from the felt 31 further dries the web. The creped web is directed around a guide roll 43 and into the drier drum section 44.

The heated center roll 33 is rotatably mounted 76 .such as 46 and 41 for the suction rolls 34 and 4| respectively. The standards 46 and 41 have suc-' tion manifolds therein for connecting the suction head to the rolls with a vacuum pump (not shown).

In the manufacture of heavier papers the top felt 32 may be dispensed with and the heavier web W directed under a guide roll shown in dotted lines at 48. The suction head 35 of the suction roll 34 can be shut off and the heavier web directed onto the carrier felt 31 without the aid of the top felt 32. The heavier web passes through the press roll assembly in the identical manner described above in connection with the lighter tissue web until the same has passed through the nip of the rolls 39 and 4|. The heavier web, instead of following the center roll 39 to the creping scraper 42, is pulled from the center roll 39 and directed over a guide roll 4!! fair direct passage into the drier drum section The felt 31, after passing around the suction r011 4|, is directed downward around a tensioning roll 56 which maintains the felt in a desired taut condition. After passing around the tensioning roll 56 the felt travels upward overan automatic guide roll 5| which properly centers the felt on another guide roller 52 for guiding the felt into the press roll assembly.

From the above description of Figure 3 it should be understood that the modifications of operation for the structure therein provides a very flexible apparatus which can be used on light or heavy paper webs by merely throwing a top felt in and out of operation.

In the modification illustrated in Figure 4, parts identical with those described in Figure 3 have been marked with the same reference numerals. In Figure 4, the heated center drum 39 of the press roll assembly has suction press rolls 34 and 4| pivotally mounted on each side thereof and provided with suction heads 34a and Ma respectively mounted in different positions than shown in Figure 3 for the accommodation of a different felt arrangement. The modification shown in Figure 4 is intended for treating light-weight on theFourdrinier forming wire 36 passes over the suction area defined by the suction head 3 la of the suction couch roll 3| and is transferred onto an absorbent carrier felt 55 by means of a transfer roll 33.

The web W then travels with the felt 55 under a guide roll 56, over the suction area provided by the suction head 34a. of the suction press roll 34 where .water is removed from the web through the felt by suction. The Web and felt then pass through the nip of the rolls 34 and 39 where additional water is extracted therefrom by pressure.

The web and felt then travel with the heated center roll 39 around the top thereof where the same are heated by contact therewith to reduce the viscosity of the water therein. The felt 55 is separated from the web W and passes over a guide roll 51 while the web follows the heated drum. The felt is then directed over the suction area provided by the suction head 4 la of the suction press roll 4| where water is removed therefrom by suction and the felt is opened up and conditioned for absorbing water from the web as 'it recontacts the web in the nip of the rolls 39 and 4|. The felt and web pass through the couch roll of the web forming section.

around a guide roll 15 flip of these. rolls together where water squeezed from the web is readily absorbed into the felt and the felt is then immediately again separated from the web and passes around the suction roll 4| up over guide rolls such as 56 back to the is scraped from the drier roll 39 by means of a scraper 59 which may also crepe the web. The creped web then passes into the drier drum section 44.

The modification shown in Figure 4 therefore provides for the use of a single felt to carry lightweight paper through the press roll assembly.

In Figure 5 another modification of the invention is illustrated in which a single looped carrier felt conveys the paper web through the press roll section and deposits the same to the top side of a large diameter Yankee drier.

As shown in Figure 5 the Fourdrinier forming wire 60 having the web W formed thereon passes around the suction couch roll 6| over the suction head 6|a thereof. A top couch roll 62 cooperates with the suction head 6|a of the couch roll 6| to transfer light-weight webs directly onto a top carrier felt 63. The felt 63 picks up the light-weight web W and conveys the same onto a carrier felt 64 trained around the suction press roll 65 having a suction head 65a therein.

When a heavier web W is formed on the wire 66 the top couch roll 62 can be raised to the position shown in dotted lines so that the felt 63 will not contact the web until the same is already deposited on the carrier felt 64. In this arrangement for heavier webs the heavier web W is removed from the couch roll 6| and under a small guide roll66 and deposited directly onto the carrier felt 64 without the aid'of the top felt 63.

The web W or- W then passes while covered with the felts 63 and 64 through the nip of the j suction press roll 65 and a center heated roll 61 where water is removed from the web by suction The web and felts then hug the under part of the heated roll 61 to the bottom thereof where the outside felt 64 is removed from the web and directed around a guide roll 68 while the inside felt 63 continues to hug the heated roll 61 and carries the web thereon.

The'felt 64 is directed against a second suction press roll 69 and over the suction area defined by the suction head 69a thereof where water is removed therefrom by suction. The felt 64 then re-contacts the web as the same passes through the nip of rapidly absorbs water from the web.

The felt 63 follows around the upper portion of the heated roll 61 back over the Fourdrinier wire while the web is transferred onto the felt 64 and follows the felt around a roll 10 which deposits the web onto the large Yankee drier l The web 64 then returns to the suction press roll 65 over a guide roll 12, under a tensioning roll 13 and over'an automatic guide roll 14.

The web W travels around the drier drum II where it is heated and dried by contact therewith and is then either pulled off of the drier or is scraped off of the drum by a creping doctor 16. A second doctor or wiper I1 is also provided on top of the drum II to clean the same. 4

and pressure.

The modification shown in Figure 5 is there-'- The web the rolls 61 and 69 where it III roll is used, the guide roll 68 can be dispensed with thereby allowing the felt 64 to hug the center roll 6'! until it passes through the center roll 61 and the plain press roll.

The side rolls 85'and 69 are pivotally mounted and adapted to be swung into any desired pressure relation with the center roll 61 as described in Figures 3 and 4. i

In the modification shown in Figure 5 the top felt 63 follows entirely around the periphery of the center roll 61. The web is therefore protected between two felts when it passes through the nip of the press rolls in the assembly.

In the modification shown in Figure 6 parts identical with the elements described in Figure 5 have been marked with the same reference numeral.

In the structure shown in Figure 6, however, the top felt 63a does not pass around the center roll 61 but instead merely picks up light-weight nip of the webs W from the forming wire 60 and conveys the same onto the carrier felt 64. v

The first suction press 65 is provided with two suction heads 85a and 65b for defining separate suction areas. The top felt 63a and the carrier felt 64 direct the web over the suction area defined by the suction head 6513 where water is removed from the felts and web by suction. A top press roll 18 cooperates with the suction area defined by the suction head 65b of the roll 65 to squeeze additional amounts of water from the felts and web. The top pick-up felt 63a follows around this roll 18 back over the forming wire 88 while the web travels with the felt 64 through the press roll assembly and is deposited onto the drier drum H identically in the manner described in connection with Figure 5.

If heavier webs W are formed on the wire 69 the upper couch roll 62 is raised as shown in dotted lines so that the pick up felt 63a will not contact the heavy Web until the same is deposited on the carrier felt 64. The pick-up felt 63a then merely serves to protect the heavy web as it passes through the nip of the rolls 65 and 18.

In the modification illustrated in Figure 7 a single felt is used and transfers the web from the forming wire to the bottom side of a large Yankee drier as well as directs the web through the press roll section.

In Figure '7 the reference numeral indicates a forming wire having a web W formed thereon. The wire 88 is trained around a suction couch roll 8| having a suction head 8|a therein and a top roll 82 cooperating therewith for transferring the web W from the wire 88 to a carrier felt 83.

The web W and felt 83 are then passed under a guide roll 84 and up over a suction roll 85 having a suction head 85a therein for removing water from the web through the felt 83. The web and felt then pass through the nip of the suction press roll 85 and a heated center roll 86 where additional water is removed therefrom by pressure. The web and felt then follow around the periphery of the heated roll 86 with the web in contact with the periphery of the roll. The web and felt are thus heated to reduce the viscosity of the water entrained therein and make possible a freer extraction of the water therefrom. The felt 83 is momentarily removed fromthe web W and passes over a guide roll 81 while the web hugs the heated roll 86.

The felt 83 is directed by the roll 81 against a second suction press roll 88 and over the suction head 88a therein where water is sucked from the felt to dry the same and to open up the pores thereof. The felt then recontacts the web as the same passes through the nip of the rolls 86 and 88 and readily absorbs water squeezed from the web. The water absorbed intothe felt is removed by suction through the suction head 88a.

The web and felt then pass under a guide roll 89 and travel toward a large Yankee drier 90. A transfer roll 9| is provided for receiving the web and felt to transfer the web from the felt onto the periphery of the drier 98. The felt then travels back to the forming wire and the web travels around the drier drum 98 where it is dried by contact with the heated drum. The web is pulled from the periphery of the drum around a roll 92 or can be scraped from the drum by a creping doctor 93. A second doctor 94 is provided for wiping the periphery of the drum clean.

If desired a wiper 95 can be urged against the periphery of the heated roll 86 to clean the same.

In the modification illustrated in Figure 8 the arrangement is substantially identical with that described in Figure 7 and identical parts have been marked with the same reference numeral.

However in Figure 8 the heated drum 86 is provided with a bottom felt 96 which is trained around the periphery thereof so that the web will be carried between two felts as it passes around the heated roll between the suction presses.

The felt 96 is directed into contact with the web W on the felt 83 by a guide roll 91 mounted under the suction press 85. The felt 96 thereupon covers the web W on the felt 83 as the same passes through the nip of the rolls 85 and 86 and acts as the bottom felt for the entire travel of the web around the periphery of the center roll 86. The felt 96 is removed from the center roll 86 over a guide roll 98 and under a tensioning roll 99. If desired a wiper or scraper I80 can act against the periphery of the center roll 86 after the felt 96 has been removed therefrom over the roll 98. The scraper or wiper will serve to clean the periphery of the roll 86.

The use of the felt 96 serves as an added pro tection for the web inits passage through the nips of the press rolls and around the periphery of the center roll. v

From the above description it should be understood that this invention provides practical felt arrangements for horizontal press roll assemblies and also provides for the use of a heated drum in the assembly to lower the viscosity of water entrained in the web and carrier felts therefor.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I, therefore, do not purpose limiting the patent granted hereon otherwise than necessitated by the prior art.

I claim as my invention:

1. In a web dcwatering press roll assembly having a free-draining nip allowing gravity drainage of water therefrom and not requiring crowning of the rolls to offset against vertical defiection thereof for maintaining uniform nip pressures throughout the lengths of the nips therebetween including a center roll and rolls on each side of said center roll in horizontal alignment therewith to define a pair of substantially vertical pressure nips, at least one of said rolls being a suction roll having a suction area at the nip partially defined thereby, and at least one guide roller spaced from the assembly, the improvements which comprise an endless looped .felt trained around the guide roller and around said rolls to lap portions of the peripheries of each of said rolls for conveying a wet web of paper through the entire assembly and between the nips thereof in opposite substantially vertical directions while covering the web as it passes around the center roll, and a directing roll outside of the loop of said felt adjacent said suction roll for receiving the felt from the center roll to direct the felt alone over said suction area before recontacting the web whereby the felt will be dewatered.

2. In a web dewatering press roll assembly having a free-draining nip allowing gravity drainage of water therefrom and not requiring crowning of the rolls to offset against vertical deflection thereof for maintaining uniform nip pressures throughout the lengths of the nips therebetween including three rolls in horizontal alignment providing a substantially vertical upward passage nip and a substantially vertical,

downward passage nip, the improvements which comprise a single guide and tensioning roller spaced beneath the assembly, and a looped felt trained around said guide and tensioning roller and around said rolls to lap portions of the peripheries of each of said rolls, said guide roller and the end rolls of said three-roll press assembly being within the loop of said felt and the center roll of said assembly being outside the loop of the felt to effectonly a single reverse bend in the loop for conveying a wet web of paper through the entire assembly and through the nips in substantially vertical directions while covering the web as it passes between the nips to cause the same to hug the center roll without undue flexing of the felt.

EARL E. BERRY.

CERTIFICATE OF CORRECTION.

Patent No. 2,209,757. July 50, 191p.

EARL E. BERRY.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, line 9, before "r011" insert -nip of the; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in-the Patent Office.

Signed and sealed this 10th day of September, A. D. l9L .O.

Leslie Frazer, Acting Commissioner of Patents.

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