US2669912A - Apparatus for removing liquids from perforated rotating shells - Google Patents

Description

, .Z-JZVEIZLUPS Jolzzz E Goodzgg'L ie Ljo yd Horzzboa'gl a: 5 Ui%% 66 w, M H

GOODWILLIE ET Al. APPARATUS FOR REMOVING LIQUIDS FROM Feb. 23, 1954 J. E,

PERFORATED ROTATING SHELLS Filed May 13 Patented Feb. 23, 1954 UNITED STATES PATENT OFFICE APPARATUS FOR REMOVING LIQUIDS FROM PERFORATED ROTATING SHELLS .Application' May 13, 1949, SeriallNo.' 93,144

The-present invention relates to apparatus for removing liquids from perforated rotating. shells, and more particularlyv to apparatus for removing liquids from the surface'perforations of-a rotatable suction shell or drum employediin-a papermaking machine.

The employment of. suction rollssor drums in paper making machinesuto removewater from the wet paper'web'has longbeen known in the art. Such suction drums are typically provided with means for. receivingwater removed :from the web and for'conveyingtthi water from the interior of .the shell. However, fully satisfactory means has .not heretofore'been provided for-removing Water from the relatively small diameter perforations or holes'inthe shells of 'such drums. It has been found that, in certain applications, particularly in those .machineswhich operate at low web speeds, the centrifugal force generated upon rotation-of the shell is insufficient to throw water outwardly from the holes or perforations of the shell. .A'ccordingly moistureor water in these perforations wilLnot: be effectively :removed, and this moisture may later contact the web. to interfere with the drying efficiency of thedrum.

1 The present invention'now providesnoveland inexpensive means for .effectivelyrremoving liquids from the surface perforations .ofrotatable, perforated shells or-suction drums. Intgeneral, the present invention includes means for introducing gaseous fluid-under. pressure into the interior of the rotating drum or shell with the escape of this .fluid throughthe. surface; perforations "of thedrum carrying withitany-liquid contained therein. -Means '...are also. provided for. catching the liquid thus escaping fromthedrmn'and for conveying the liquid from th machine Without the possibilityof Wetting the paperweb.

The means of the present invention. may be used in connection with: a 1 suction .drum-orsroll at any :place where such: andrummay. 'be employed in a PBper-makingmachine. For example,. the present --.invention may he employed in connection with a suction :drum': press assembly; or with, a. suction roll positioned inthedrier press -assembly f the-.- machine. Alternatively, the devic of thepresent-invention may be mployed in connection with suction rolls positioned in other portions' of ithemachine; as with a sucti'on couch roll.

A "feature. of thisinvention is: its adaptability to; standard suction -.roll.; constructions so. that, it canilaes. added to the .::conventional assemblies-lay mereaddition-ofipart's.

51131518, therefore,.-.anaimportantoobjectuof the invention to provide an improved-.roll-assemblv fora papermaking-machine including asuction drum and means forremoving.:liquid-.if1:om"the surfac perforations of the drum.

I Still another important object-ofthepresent invention is to provide an.improvedaapparatus for the removal of liquid fromwthesurfaceiperforationsof asuction roll-.including-meansf for introducing a fluidunder DreSsureHintQltheQinterior of the roll for=.escape through the surface perforations thereof in combination witnmeans for receivingliquid thus removedfr'omitheroll.

Other. andfurther important objects of Ztli'is invention will be apparent..from..th ..d=isclosures in the specification and the accompan'yingidrawings.

On the drawings:

Figure 1 vis-aufragmenta ryt vertical. crossisection,. partially. diagrammatic .in.'.form,..andwith parts in. elevation, of .a .su'ctionepressdassembly for i a paper making machine .embodying'the. present invention; and

. Figure 2 is..a similar vertical cross. section a: adifierent type of .pressiassern'bly.alsoequippd with the shell. de-watering construction. er; the present invention.

. .As shown onthe drawings:

'LInfFigure 1, reference mimerat llllrefersJgenerally to asuction press.assemblyincluding-5a pair of cooperating suction press drums or riills II and l2-fdefining'therebetween a suction...iiip l3 receiving a wet. paper web -I 4. .interposed.between cooperating press" felts"l5. and Hi.

"The suction roll I I includes-a rctatablymounted,. radially perforated cylindenorfshell l'lI- journaled. at. its. ends, as conventional-inthe art, for rotation. about its longitudinal. axis. ..-.A suction gland or box 18 is disposed-.within"thecylinder I! and extends alongthe interior of. thepiilirider I! in a'direction substantially parallel-to itsaids of rotation. 'The suction gland .i fitcar-riesmadially outwardly extending. packing strips i 9. conta'cting-v the inner peripheral surface-.ofithecylinder l1 fat. peripherally; spaced points. I The. packing strips I 9. cooperate-to define .therebetweenz'aaela tively' broadvlocalizedsuctioniareaam on thaw-1 indenpr shell I].

The suction drum or roll |2 includes an outer rotatable, radially perforated, cylinder substantially identical in construction with the cylinder hereinbefore described. The suction gland or box 2| is mounted in the interior of the cylinder 29 and extends generally parallel to the axis of rotation of the cylinder 20. The suction gland 2| is provided with a plurality of packing strips extending radially outwardly therefrom into contact with the inner periphery of the drum 29. A pair of packing strips 22 and 23 is disposed in the lower portion of the drum I2 immediately above the restricted nip |3. The strips 22 (on the on-coming side of the nip) and 23 (on the off-running side of the nip) cooperate with the inner periphery of cylinder 20 to define a relatively narrow suction area B.

A third packing strip 24 cooperates with the strip 23 to define a suction area C which is of substantially greater width than the suction area'B.

The suction gland 2| is provided with a relatively narrow, reduced opening 25 for connecting the suction area C with the interior of the gland, while the mouth 26 affording communication with the suction area B is unobstructed. A butterfly-type valve 21 is provided in the restricted opening 25 to adjust the size of the opening 'for varying the suction in the suction area C as compared with the suction in the suction area B. The butterfly valve 21 may be controlled byany suitable means (not shown), as by a control lever extending beyond one circular end face of the cylinder 20 to vary the relative suction values in the areas B and C.

An additional packing strip 28 is provided in spaced relation to the packing strip 24 to define an arcuate, relatively broad area 29 in the interior of the cy1inder'29. The area 29 is peripherally spaced on the off-running side from the suction areas B and C so that, when thecylinder is rotated, the periphery of the cylinder first passes the suction area B, then the suction area 0, then the area 29.

A fluid manifold or conduit'30 is connected to a'suitable source of fluid (i. e. gas) ,under pressure, as for example, air, and communicates with the periphery of the drum l2 at thatportion of the outer surface of the cylinder 20 overlyingthe chamber 29 (and adjacent the packing strip 28).

Communication between the manifold 39 and the chamber 29 is provided by means of the manifold outlet mouth 3| provided with terminal packing strips 32 which extend into contact with or into closely spaced relation to the outer peripheryof the cylinder 20 (thereby effecting a substantial seal therebetween). It will be seen in Figure 1 that fluid under pressure .above the manifold will be introduced into the chamber 29 through the radial perforations 29a of the cylinder 20 and that the fluid under pressure so introduced into chamber 29 will be free to escape fromthe cham her through additional perforations. 29a not aligned with the inlet mouth 3|. (and atan exposed portion of the shell l2 not covered by the manifold 39 or the felt l6), 7 Fluid under pressure escaping through the perforations 20a will carry with it any water, which might be lodged in these perforations. A catchall trough or shield 33 is disposed adjacent the cylinder 20 to overlie that portion of the cylinder adjacent the chamber 29 to receive water and air'forced from the cylinder by the fluid under pressure. The shield 33 is prov'ided'with a lower horizontal leg 34 which extends into; closely spaced relation to the periphery of the cylinder 20 with an upturned terminal lip 35 preventing the escape of liquid from the trough while permitting the escape of excessive fluid pressure therefrom. A drain from the trough 33 is provided by a drain line 36 in the lower portion thereof.

As shown in Figure 1, the wet paper web M, carried by press felt I5, is lapped about that portion or roll ahead of the nip It, the web and felt overlying the suction area A of the roll I. The other press felt I6 is guided into contact WlththQ web M while the web is supported by roll II and immediately ahead of the nipv l3 so that the web |4 itself is not contacted by the roll l2. Water from the web will be drawn into suction box I8 of roll due to the contact of the web ,l4 and the press felt l5 with the suction area A. Upon passing through the nip l3, therelatively high suction of the suction area B will serve to further de-water the moist web M. However, a portion of the water removed from the web l4 and the felts 5 and I6 will remain in the radial perforations 20a of the cylinder 29. The relatively low suction of suction area C, as determined by the setting of the butterfly valve 21, will retain this water within the perforations 29a to prevent are-wetting of the web as it leaves the nip.

The present invention efliciently removes all water'from the shell holes or perforations by forcing air under pressure'into the chamber 29 and then allowing this fluid to escape through the perforations into the interior of th'catch-all shield or bafiie 33. In this manner, effective removal of water from the perforations'zlla is insured despite the speed of travel of the web l4. It will 'be noted that the air chamber 29 is created by merely adding the single packing 29 to the suction roll l2 and by merely closing the ends of the chamber with end' deckle plates or extensions of plates for the chambers 13 and C.

' In Figure 2, a modification of the apparatus of Figure l is shown as employed in a press section equipped with a bottom suction roll l2 and a plain top roll 31. However, the shell de-watering construction is essentially the same as shown in Figure 1 and identical reference numerals designate similar parts of the apparatus. The operation ofthe shell de-watering device of Figure 2, is identical with the operation of the device of Figure las will be readily appreciated by those skilled in the art.

Itfwill, of course, be understood that various details of construction may be varied through a wide' range without departing from the principles' ofthis 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 machine, a first press roll, a second press roll defining a press nip therewith, a felt trained through said press nip, means conveyingthe felt away from the first press roll surface at'the off-running sideof the press nip providin'g'an exposed portion of thefirst press roll surface atthe off-running side, said first press roll having a perforate rotating roll shell, a stationary suction gland mounted within said roll shell, first sealing means on said gland cooperating with said shell to definea suction area in the first press roll at said press nip, second sealing means on said gland defining a fluid pressure chamber between the gland andit'he shell extendf-rom adjacent the suction area to a point answers 5. angularly displaced from the suction area-011 1711 off-running side oftheexposedportiorr of-said first press roll, said second sealing means includ inga packing-strip atsaid point, a conduitmouuted 'outside the roll shell; adjacent :said pointland connected to asource of gas under -pressme,:thir'd sealin meansdnounted cn-said-conduit and cooperating with said shell to conduct a gas blast fromwsaid conduit through said shell adjacent said; pointinto said-fiuid pressure chamber and then outthrough theex-posed-portion of sa'id first press roll; and stationary fiuid pressure receiving means positioned exteriorly of said shell opposite the exposed portion of said first .press roll to receive fluid forced back through the shell.

2. In a paper machine having a first press roll, a second press roll defining a press nip therewith, a felt trained through said press nip, and means conveying the felt away from the first press r011 surface at the off-running side of the press nip providing an exposed portion of the first press roll surface at the off-running side, the improvement in which said first press roll is provided with a perforate rotating roll shell, a stationary suction gland mounted within said roll shell, first sealing means on said gland cooperating with said shell to define a suction area in the first press roll at said press nip, a pair of packing strips on said gland defining a fluid pressure chamber between the gland and the shell extending from adjacent the suction area where one of the strips is positioned to a point where the other of the strips is positioned angularly displaced from the suction area on the off-running side of the exposed portion of said first press roll, a conduit mounted outside the roll shell adjacent said point and connected to a source of gas under pressure, second sealing means mounted on said conduit and operating with said shell to conduct a fluid blast from said conduit through said shell adjacent said point into said fluid pressure chamber and then out through the exposed portion of said first press roll, and stationary fluid pressure receiving means positioned exteriorly of said shell opposite the exposed portion of said first press roll to receive fluid forced back through the shell.

3. In a paper machine having a first press roll, a second press roll defining a press nip therewith, a felt trained through said press nip, means conveying the felt away from the first press roll surface at the off-running side of the press nip providing an exposed portion of the first press roll surface at the off-running side, the improve ment in which said first press roll is provided with a perforate rotating roll shell, a stationary suction gland mounted within said roll shell, first sealing means on said gland cooperating with said shell to define a first suction area in the first press roll at said press nip, second sealing means on said gland defining a second suction area immediately adjacent the first area, third sealing means on said gland defining a fluid pressure chamber between the gland and the shell extending from adjacent the second suction area to a point angularly displaced from the "second suction area on the off-running side of the exposed portion of said first press roll, said third sealing means including a packing strip at said point, a conduit mounted outside the roll shell adjacent said point and connected to a source of gas under pressure, third sealing means mounted on said conduit and cooperating with said shell to conduct a gas blast from said conduit-through said shell adjacent said point into said fluid pressure chamber and then out through the exposed portion of said first press roll, and

tioned -exteriorly of saidshell "opposite ithw fexposed port-ion' -of 'saidifirst' press roll to receive fluid fdrced back Ethr ough the shell.

4. In a papermachine having a first press roll, a secondepress rolldefining' a press n-ip therewith, a felt trainedithroilfglrasaidpress1.nip,;.and means conveying the felt away fromtthe first press roll surfacetatcthe off-running. sideioft the pressnip providinglan exposed portionrbfgtthe firsttpress r1111 isurface-at'the (in-running side, theimprovem'ehtiin which saidfi'rst press roll is proivid'ed with a perforate'rotating"shell, a stationary suction gland mounted within said roll shell, a first packing strip on the gland at the on-coming side of the press nip, a second packing strip on the gland at the off-running side of the press nip and cooperating with the first strip and the shell to define a suction area in the first press roll at said press nip, a third packing strip on the gland ata point angularly displaced from the second packing strip on the off-running side of the exposed portion of -said first press roll and cooperating with a baffie portion of said gland and the second packing strip to define a fluid pressure chamber between the gland and the shell, a conduit mounted outside the roll shell adjacent said point and connected to a source of gas under pressure, sealing means mounted on said conduit and cooperating with said shell to conduct a gas blast from said conduit through said shell adjacent said point into said fiuid pressure chamber and then out through the exposed portion of said first press roll, and sta tionary fluid pressure receiving means positioned exteriorly of said shell opposite the exposed portion of said first press roll to receive fluid forced back through the shell.

5. In a paper machine having afirst press roll, a second press roll defining a press nip therewith, a felt trained through said press nip, and means conveying the felt away from the first press roll surface at the off-running side of the press nip providing an exposed portion of the first press roll surface at the off-running side, the improvement in which said first press roll is provided with a perforate rotating shell, a stationary suction gland mounted within said roll shell, a first packing strip on the gland at the on-coming side of the press nip, a secondpacking strip on the gland at the off-running side of the press nip and cooperating with the first strip and the shell to define a first suction area in the first press roll at said press nip, a third packing strip on the gland angularly spaced from the second strip and cooperating therewith to define a second suction area immediately adjacent and at the off-running side of the first suction area, a fourth packing strip on the gland at a point angularly displaced from the third packing strip on the off-running side of the exposed portion of said first press roll and cooperating with a baflle portion of said gland and the third packing strip to define a fluid pressure chamber between the gland and the shell, a conduit mounted outside the roll shell adjacent said point and connected to a source of gas under pressure, sealing means mounted on said conduit and cooperating with said shell to conduct a gas blast from said conduit through said shell adjacent said point into said fluid pressure chamber and then out through the exposed portion of said first press roll, and stationaryfluid pressure receiving means positioned exteriorly of said shell 7 opposite "the exposed portion of said first press Number roll to receive fluid forced back through the shell. 2,054,391

' 1 JOHN E. GOODWILLIE. 2,209,759

LLOYD 'HORNBOSTEL. 2,338,465

' a v 5 2,415,351 *References Cited in the file of this patent 2,429,689

UNITEDSTATES PATENTS Number v Name I Date Number 1,234,543 Hellstrom' July 24, 1917 329 7 1,520,489 Wagner D60. 23, 1924 377 440 1,892,306 Hillier Dec. 2'7, 1932 531,879

1,914,742 Hillier June 20, 1933 Name v Date Schmidt 'Sept. 15, 1936 Berry July 30, 1940 Street"; Jan. 4,1944 Hornbostel et a1 Feb. 4, 1947 Hornbostel Oct. 28, 1947 FOREIGN PATENTS I Country Date Germany Dec. 7, 1920 I Germany June 18, 1923 Great Britain Jan. 13, 1941

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