US2942662A - Cylinder type paper making machine - Google Patents

Description

June 28, 1960 J. E. GOODWlLLIE CYLINDER TYPE PAPER'MAKING MACHINE 2 Sheets-Sheet 1 Filed March 6, 1956 Eye 1711:?

John E. Goodwill? June 28, 1960 J. E. GOODWILLIE CYLINDER TYPE PAPER MAKING MACHINE Filed March 6, 1956 2 Sheets-Sheet 2 United States Patent CYLINDER TYPE PAPER MAKING MACHINE John E. Goodwillie, Beloit, Wis., assignor to Beloit Iron Works, Beloit, Wis., a corporation of Wisconsin Filed Mar. 6, 1956, Ser. No. 569,713

9 Claims. (Cl. 162-317) This invention relates generally to paper making machinery, and more particularly to cylinder paper machines capable of being efi'iciently operated at high speeds.

Heretofore, it has been diflicult to operate cylinder paper machines having a cylinder mold roll at high speeds where a coucher roll and pick-up felt are employed to remove the paper web from the cylinder mold surface, since the nip defined between the coucher roll and the cylinder mold roll ran extremely wet to the point where the paper sheet crushed under the coucher and the pick up was very uncertain. Hence, when desiring to run the cylinder mold roll at higher speeds, the problem encountered was to dry up the nip between the coucher and cylinder mold roll, and provide positive pick-up or the sheet.

in the present invention, a foraminous cylinder mold roll is suspended in an enclosure having an opening in the top thereof, wherein part of the mold forming surface projects through the opening. An adjustable duct means is provided for selectively delivering a variable stock flow to the cylinder moldforming surface. A pickup or coucher roll having a felt trained thereover defines a nip with the cylinder mold forming surface.

In solving the above mentioned problem, the enclosure is subjected to a negative pressure thereby creating a pressure differential across the forming surface of a cylinder mold roll. This causes a stream of air to enter above a sealing blade of the enclosure coacting with the cylinder mold roll forming surface and below the pick-up which effectively blows the water entrained in the meshes. of the wire back into the interior of a cylinder mold roll and doctors off from the undersurface of the wire that sheet of water which is carried on the undersurface by the combination of adhesion to the wire and centrifugal force.

Secondly, the construction of the cylinder mold roll is such that the covering wire is spaced at least onequarter of an inch from the longitudinal supporting bars thereby allowing enough room for the air stream to come in on its almost tangential approach to doctor the water away from the underside of the wire.

Finally, in order to obtain a positive pick-up of the paper sheet from the cylinder mold roll forming surface and to further dry up the pick-up nip, a suction pick-up roll is trained thereover and defining the nip with the cylinder mold roll forming surface.

Accordingly, it is an'object of this invention to provide a cylinder paper machine having a variable delivery duct for controlling the stock flow to the cylinder mold roll.

Another object of this invention is in the provision of a stock supply duct for a cylinder paper machine comprising an inner stationary wall and an outer pivotally mounted wall, wherein the walls coact to selectively control the stock flow to the cylinder.

A further object of the invention is to provide a cylinder paper making machine having a cylinder mold roll with a forming surface subjected to a pressure differential, wherein the machine is capable of'operating at high speeds.

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A still further object of this invention resides in the provision of a cylinder paper machine having a cylinder mold roll, wherein the forming surface of the mold roll is subjected to a suction pressure to enhance removal of water from the sheet formed on the roll.

Another object of this invention is to provide a cylinder paper making machine having a cylinder mold roll with an outer wire covering which is rotatably suspended in an enclosure that is under a negative pressure, wherein the paper sheet formed on the roll is taken off by a coucher and felt arrangement and the air stream entering the mold roll below the pick-up blows the water entrained in the wire meshes back into the interior of the mold and doctors off the sheet of water carried on the undersurface of the wire. 7

Another object of this invention resides in the provision of a pick-up arrangement for a cylinder paper machine operating at high speeds which provides a.positive pick-up while maintaining the nip with the cylinder roll relatively dry. 7

A further object of this invent-ion resides in the provision of a cylinder mold roll operating under a suction pressure and at high speeds, and a suction pick-up roll with a felt trained thereover defining a nip with the mold roll.

Another object of this invention is in the provision of a suction pick-up roll for a cylinder mold, wherein the suction area in the suction pick-up roll extends from the leaving side of the centerline between the pick-up roll and the mold roll to the point where the felt over the pick-up roll leaves the face thereof.

A further object of this invention is to provide a foruminous cylinder mold including a hub having a pair of axially spaced end head members, a plurality of circum' ferentially spaced and annularly arranged bars extending between the end head members, a tape set on end and spirally wound around the bars, and a wire covering supported by said tape and defining a stock forming surface, wherein the spacing between the bars and the wire cover ing is at least .250 inch.

Other objects, features, and advantages of the inven tion will be apparent from the following detailed disclosure, taken in conjunction with the accompanying sheets of drawings, wherein like reference numerals refer to like parts, in which, on the drawings:

Figure 1 is generally a diagrammatic elevational view, showing some parts broken away and other parts in section, of a cylinder paper machine according to the invention;

Figure 2 is a partially broken and fragmentary elevational view of a cylinder mold roll according to the invention, with some parts broken away and other parts in section for purposes of disclosing underlying parts; and

Figure 3 is an enlarged fragmentary view, taken along a radial plane through the cylinder mold of Figure 2 illustrating the manner in which the outer covering wire is supported on the longitudinal bars or rods.

As shown on the drawings:

In Figure 1, a foraminous cylinder mold roll, generally designated by numeral 10 is rotatably supported in an enclosure or tank 11 having a front wall 12, a rear wall 13, side walls 14, 14, and a bottom 15. The front wall 12 terminates at about the center of the mold roll 10 at an upper edge 16 in close proximity tothe outer forming surface of the mold roll, this upper edge being common to an inner stationary wall 17 of a stock supply duct 18.

The inner wall 17 of the stock supply duct 18 is angularly displaced relative to the enclosure front wall 12 and coacts with an outer wall 19 to control the stock flow to the cylinder forming surface. The outer wall 19 is arcuately formed and provided with a slice point 19a at its upper end in circumferentially spaced'rela- 'tion to the upper'edge 16 of the inner wall 17 and in close proximity to the outer forming surface of the mold-roll 10. A 'trailingedge 19b terminates the outer wa l 1 .-a d s e. w h h u p r. e g i t i al odefihe aihm .A supporting arm Zl is thereby allowing pivotal movement of the outer wall 19 toward and away from the mold roll to-vary the size of jthroat 20 and control-the stoeloflow 'to the'mold roll.

7 Means for eifecting the selective adjustment of the outer wall l9, in-the instant case, constitutes a turn buckle 24 pivotallyattached atone-end to the outer wall '19 and at the other end to the upstanding supporting member23.

V Hence, regulation of the; stock flow to.;the mold roll is a continuationfrom theinneriduct wall 17 .butangularly related thereto, a rearjstationary wall .30, and a forward 'wall 31that' is rigidly connectedto the outer duct wall 19 by an-angularly related wall 33 and another angularly related wall 34. Connecting the front wall 31' and the rear wall vfifl'of the inlet chamber is a flexiblesealing member 35; of inverted U-shape which permitsimovement of the front wall Slandits associated parts during the movement of the outer duct wall '19. The sealing member,35 may be constructed of rubber or other equivalentgmaterials Axsecond'rectifier roll 36-is positioned at'the outlet of theinlet chamber 27 andthe inlet 'of the stock delivery duct 18. On opposite sides vofthe inlet chamber 27,- the supply duct 18 and r by the parallel spaced supporting members 23, 23.. The sheet formed on the mold roll 10 the'passageway 26 are sealingly enclosed is removed by a pick-up or coucher roll 37 havingfa pick-up felt38 trained, thereover which defines a nip with the mold roll 10 at the downgoing side thereof. Since, this nip has a tendency to run extremely wet during high speedoper-' ation: of a mold roll 10,'a pressure difierentialis cre ated on the forming surface of the roll by any suitable ine'ansgsuch as connecting the enclosure 11 to a pres- V V attached to the outer 19 and pivoted at 22 to; an: upstanding wall member 23.

seen most clearly in Figure 2, the mold roll includes an i elongated hollow hub 41 having stub shafts 42, 42 projecting from each end thereof. Axially spaced'end heads 43, 43 (only one shown) are carried on the opposite ends of the hub, and include a central cylindrical spacing portion '43 surrounding the hub anda radially extending annular disk portion 43b. Blind holes are provided on the'inner faces of each end head near the outer periphery thereof to receive between the end head a plurality of circumferentially spaced and a nnularly arranged rods or bars 44. To additionally support the bars 44 in spaced relationship frornithe hub 41',-'a plu-ra1ity of axially spaced disk-shaped members 45 are provided adjacent each end head on the hub. The outer peripheries ofthese members are notched at 46 as'seen in Figure 3 to receive the bars 44. Additionally, spacer members'47 are provided between the supporting members 45 and connected by an elongated nut and bolt assembly 48. V

To furthersupport the intermediate portions ofthe bars or rods 44,49- plurality of axially spaeed spider members 49, each of which includeradiallyarranged spiders, 49a connected at theirouter endsj;by;an annulus 49b, are carriedcn the -hub. 41. These members are alsoinotched to seat the bars 144. While .each of the spider members .49 are provided with'an equal num- 1 her offspiders 49a, the adjacent spiders are angularly displaced so thatfa spider. 49a of one member .49 is circumferentially displaced. frornl-ra corresponding spider 49a of an adjacent spider member 49. Spacing'fianges are-provided for the disk-shaped member 145 and the spider members 49 which surround the hub'andprevent the members from moving axially relative to each other.

'The bars or rods .44 are slotted atthe outer periphery in'a spiral or helical fashion to seat a formed tape 51 set on edge and spirallywound around the 'annularly arranged bars-44. 'A covering #wire 52 0f any suitable type is then wrapped'around'the .outer periphery of-the tape 51 and secured at its lateral edges to the end heads sure source 39. -Prefera'bly,-anegative-pressure will be developedrwithin the enclosure 11 therebysubjecting the mold to a. suction pressure. A top'cover member 40 extends fromjthe upper edge of the rear enclosure 7 .to a conventional cylinder mold to improve its load carrying capacity and to remove the present speed limitation which definitely exists on a conventional arrangement. Y

The stream of air which enters into the enclosure 11 1 around the cylinder .mold 10 through the opening below the pick-up nip and above the free end of the sealing blade or cover member40 strikes the wire facing of the mold at such a velocity that it has the effect of removing the water entrained in the meshes of the wire back-into the interior of the cylinder mold, and of doctoring '03 from the undersurface of the wire that sheet of water which'iscarried on the undersurface by the combination of-adhesion to the wire and centrifugal force.

43 by clamping rings 53." 7

In order to allow the air; stream enterin'g'the mold roll below the pick-up 'nip to'attain an almost tangential approach anddoc tor the water away from the un-' ders'ide of the wire, it was found; necessary to space the covering -wire'52 at "least .250 inch from the bars 44. 'Laterally projecting flanges 54 are attached to the outsideof each end head 43 for coaction with declrle or sealingstraps in sealing the mold' roll the end n e -11 The paper sheet is removedfrorn' the surface or'wire of the mold roll '10 by the pick-up roll 37 and its associated pick upt felt .38. flhis pick-uproll is of a suc- 7 tion varietyand defines ship with the mold roll '1 0 at a point spacedslightly above thetfree end of the enclosure cover member 40. In, order to obtain amore positive pick-up of the sheetfrom the cylindermold .and to further dry up the pick-up nip, itwas found that asuction pick-up roll -was'. necessary for. operations at the higher rates of speeds. The vacuum in this pick-up roll need notbe too large, but it is necessary to overcome the resistance of the sheet to be removedaway from the cylinder mold roll surface .which is also.running under vacuum high enough to cause the. required air stream velocity .to enter at the pick-up. point.w 1

The pick-uprollv 37 .includesa perforated shell 37a rotatable around astationarysuction box .3711. In the suction pick-up roll the suction area extends from the leaving side of the centerline between the pick-up roll and the mold roll- 10 to the point where the felt 38 leaves the faced the piclg-up roll. The positioning of this suction. area is rather critic-a1 in that when the vacuwater is lifted with the sheet from thefface of -the mold than can be properly handled by the suction roll action,

resulting in a sheet and felt leaving the suction pick-up roll in a very wet and somewhat unevenly wet condition. Also, if the vacuum action of the roll does not continue to the point where the felt leaves the face of the pick-up roll, part of the water drawn into the perforations of the roll shell passes back into the felt and re-wets the sheet. A save-all 55 is provided behind the pick-up roll, and it will be understood that the action of the vacuum area is to hold the water in the perforations so that when it releases, the water is thrown into this save-all. While the running of the felt 38 away from the suction pick-up roll is shown as rising, it is generally preferred to have a down-running felt in order to facilitate directing the water into the save-all, particularly at lower speed operation.

From the foregoing, it is seen that the present invention provides a cylinder mold roll arrangement which gives better control at higher operational speeds, while providing a simple and rugged arrangement. In operation, control of the stock flow may be adjusted by selective movement of the outer movable wall 19 of the supply duct 18. In subjecting the mold roll 16 to a vacuum or suction pressure, the opening between the upper free edge of the cover member 40 and the pickup nip serves as an inlet-for the inrushing stream of air which has the apparent effect of removing the water that is held under the wire covering from the wire to further dry up the pickup nip. Actually, the air stream elfectively blows the water entrained in the meshes of the wire covering back into the interior of the cylinder mold roll and doctors off that sheet of water carried on the undersurface of the wire by a combination of adhesion and centrifugal force. And in order to provide a more positive pick-up of the sheet from the cylinder mold and to further dry up the pick-up nip, a suction pick-up roll is provided at the nip which allows higher speed operation of the cylinder mold roll.

It will be understood that modifications and variations may be effected without departing from the scope of the novel concepts of the present invention, but it is understood that this application is to be limited only by the scope of the appended claims.

I claim as my invention:

1. In a paper machine, an enclosure having front and back walls, side walls, and a bottom, a hub rotatably mounted in said enclosure, axially spaced end heads carried at opposite ends of said hub, cireumferentially spaced and annularly arranged bars extending between said end heads, axially spaced supporting members between the end heads and the hub and bars, slots formed in said bars in a spiral pattern, formed tape spirally wound around said bars and seated in said bar slots, a covering wire overlying said tape and defining a paper forming surface for a cylinder mold, said cylinder mold being positioned within said enclosure so the upgoing side of the wire forming surface is spaced in close proximity to the upper edge of the front wall, means above said upper edge of said front wall for delivering stock to the forming surface, a cover member extending from the top edge of the back wall and having a free end terminating in overlying close proximity to the down-going side of the wire forming surface, a suction pickup roll having a felt trained thereover and defining a nip with said wire forming surface a short distance above the free end of said cover member, and means for creating a negative pressure in said enclosure whereby a tangential flow of air will be created through the wire above the free end of the cover member for acting on the forming surface and removing the water entrained in the wire meshes and carried on the undersurface of said wire.

2. In a paper machine, an enclosure having an opening in the top thereof, a foraminous cylinder rotatably suspended in said enclosure, said cylinder having a cylindrical forming surface, said surface partially projecting through said opening, a pick-up roll having a felt trained thereover defining a nip with said forming surface with the roll located to form the nip at a location leaving a portion of said projecting surface exposed below the nip, means for delivering stock to said surface, and means for creating a pressure difierential on the forming surface whereby a tangential flow of air will be cerated through said exposed surface to dry the surface at said nip for improved pickup of stock from the surface to the felt.

3. In a paper machine, an enclosure having an opening in the top thereof, a foraminous cylinder rotatably suspended in said enclosure and having a cylindrical forming surface projecting partially through said opening, a suction pickup roll having a felt trained thereover and defining a nip with said forming surface located to leavean exposed projecting cylinder area after said nip, duct means capable of delivering a stock flow to the forming surface, and means for creating a negative pressure within said enclosure to cause a tangential flow of air into said exposed area to dry the cylinder at the nip.

4. In a paper machine, an enclosure having front and back walls, side walls, and a bottom, a foraminous cylinder rotatably mounted in said enclosure and having a cylindrical wire forming surface, said surface being spaced in close proximity on its up-going side with the upper edge of the front wall, duct means above the upper edge of the front wall capable of selectively delivering a stock flow to the forming surface, a cover member extending from the top edge of the back wall and havin a free end terminating in overlying close proximity to the down-going side of the forming surface, a suction pickup roll having a felt trained thereover and defining a nip with the forming surface a short distance above the free end of said cover member, and means creating a pressure differential on said forming surface whereby a tangential inward flow of air through said surface will be created between nip and said free end of said cover member to aid the pickup of stock from the surface by the felt.

5. In a paper machine, an enclosure having front and back walls, side walls, and a bottom, a foraminous cylinder rotatably mounted in said enclosure and having a cylindrical wire forming surface, said surface being spaced in close proximity on its upgoing side with the upper edge of the front wall, duct means above the upper edge of the front wall capable of selectively delivering a stock flow to the forming surface, a cover member extending from the top edge of the back wall and having a free end terminating in overlying close proximity to the down-going side of the forming surface, a suction pickup roll having a felt trained thereover and defining a nip with the forming surface a short distance above the free end of said cover member, and suction means connected to said enclosure for creating a substantially tangential flow through the cylinder area between the nip and said top edge of the back wall whereby water will be doctored from the cylinder inner surface and the cylinder dried at the nip.

6. In a paper machine, a foraminous cylinder rotatably mounted and having a cylindrical forming surface, a suction pickup roll having a felt trained thereover defining a nip with said forming surface, a fiat surfaced sealing blade extending substantially tangential to the cylinder and overlying the cylinder surface in close proximity a short distance after said nip, means for delivering stock to said surface, and means for creating a flow of air through the forming surface between said nip and said sealing blade to cause a tangential air flow over the fiat sealing blade to transfer the stock and dry the nip.

7. In a paper machine, a cylinder rotatably suspended in an enclosure and having means defining a foraminous movable paper forming surface, means forming a suction pickup surface having a felt trained thereover and meeting the forming surface in substantially line contact transverse of the direction of movement thereby defining a nip with said forming surface, said enclosure spaced fIOIhfSBidj nip on the downmnning side of the forming surface, duct means positionedlto. deliver a stock flow: to. the forming surfacegand means jfor;causing: asubstantial tangential flow-ofair1 ithrough said forming surface'at said nip in' the space between the en-@ closure and nip .against the directional? movemenbof the surface, to dry the forming surface at the'nip and to aid the transferof stock from the forming surfaceto the pickup felt wherein removal of water entrained in said foraminous surface and carried on the underside of said surface iseffected, r I r v 1 8. In a cylinder paper machine, a-rotatablecylinder mold comprising a hub, axially-spaced end heads carried at opposite ends of said hub," circumferentially spaced and annularly arranged bars extending between said. end heads, axially spaced supporting members between the end heads and the hub and bars, slots formed in "said bars'in a, spiral pattern, formed. tape spirally wound around said bars and seated in said barv slot-s to project above the surface. of said bars, .a :covering 'wire. overly; ing said tape and defining a paperfor'min'g surface spaced outwardly from said bars to form an-air flow. space therebetween, means fordepositing .a layer of paper stock. on the screen, a suction pickup" rollcarrying a pickup ,felt and positionedto define a pickup nipwith the covering wire, and means for causing afpressure differential ,bee.

hind the nip to cause a tangential drying flow of ;air inwardly through the screen underneath the paper stock to dry the screen at the nip andaid in transferring the web'to the felt.

faced paper forming foraminous screen, means for moving t e screen; means forap i ap r toekcnzthe screen, means for'supporting'the screen leaving airflow areas therebeneath, a'suction pickup member carrying a pickup felt and engaging the screen'to define a; pickup nip, and means for-directing a tangential flow of drying air beneath the paper stock-web against the direction of screen movement and through the screen at the nip to enhance the web pickup.

References Cited in they file of this patent UNITED STATES PATENTS 1,911,310 Ellis May 30,1933 1,988,402 Thomas Jan. 15, 1935' 2,162,097 Metcalf June 13,1939 2,520,327 Nilson Aug."29,'.1950 2,658,429 Malkin Nov. 10, 1953 2,658,431 Stevens Nov."l0, 1953 "2,669,910 Trotman Feb. 23', 1954 2,669,912 Goodwillie et al. Feb. 23, 1954 2,694,347 Hornbostel Nov. 16; .1954 2,717,539 Metcalf Sept. 13, 1955 2,750,854 McArn' June 19, 1956 2,755,710 Beachle'r July 24, 1956 2,756,651 Lee 2- July 3-1, 1956 r FOREIGN PATENTS Germany H--. Nov. 19, 1920

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