US3574055A - Adjustable guide for the forming zone of a paper machine - Google Patents

Adjustable guide for the forming zone of a paper machine Download PDF

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Publication number
US3574055A
US3574055A US683225A US3574055DA US3574055A US 3574055 A US3574055 A US 3574055A US 683225 A US683225 A US 683225A US 3574055D A US3574055D A US 3574055DA US 3574055 A US3574055 A US 3574055A
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United States
Prior art keywords
sheet
wire
contour
forming zone
bars
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Expired - Lifetime
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US683225A
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English (en)
Inventor
David R Gustafson
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Beloit Corp
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Beloit Corp
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Publication date
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • a plurality of bars each of which extends transversely across the wire runs, forms a contoured longitudinally extending guide surface.
  • a thin guiding sheet which conforms to the contoured guide surface, guides one of the wire runs along the contoured guide surface and into gradual convergence with the other wire run.
  • Each of the plurality of bars is mounted for independent and separate adjustment to selectively alter the contour of the guide surface.
  • the instant invention provides for the control of convergence between forming wire runs in a web forming zone in a papermaking machine.
  • forming zone which is a longitudinal region or zone extending from a point, approximately at the location of the stock stream slice or jet, where the forming wires are fairly closely spaced to a point shortly downstream therefrom where the wires may be said to have converged, in that they have been brought through the process of convergence in order to reach substantial parallelism with a moist web sandwiched therebetween.
  • the stock stream In the course of the travel of the wire runs through this converging forming zone the stock stream has some of its downstream velocity component converted to pressure (generally normal to the downstream direction) and drainage of the stock occurs through one or both of the forming wires in the forming zone by the driving of water in the pressurized stock through an initial or incipient web being formed on one or both of the forming wires.
  • the prior art workers have suggested a number of means for effecting convergence, ranging from rolls of substantial diameter (for presenting a convex curvature to one of the forming wires at the forming zone) to devices in the nature of blades which tend to effect a comparatively abrupt direction change of the wire being guided thereby in the immediate vicinity of contact with the blade, although a comparatively straight line taper from the blade to a converged end of a forming zone may be effected by this means.
  • the prior art has used such various guide means in one way or another; but it has often been found that these devices leave something to be desired in the papermaking art.
  • a guiding surface of controlled contour is used to guide one of the opposed forming wires against the other in the forming zone in order to achieve a desired gradual convergence between the wires.
  • the contoured surface will ordinarily impart substantially precisely its contour to the wire run which engages the same and it will also impart at least some deflection to the opposed wire in most paper forming operations by virtue of the fact that the pressure generated within the stock body in the forming zone is ordinarily suflicient to cause some deflection of the opposed wire (or the wire which is free from restraining means in contact therewith opposite the forming zone).
  • FIG. 1 is a side elevational view with parts broken away and parts shown in section of the converging wire guiding device of the instant invention.
  • FIG. 2 is a sectional view taken substantially along the line 11-11 of FIG. 1.
  • FIG. 1 there is shown generally a guide housing 10 which carries on the active face thereof a guiding sheet indicated generally by the reference numeral 11, which sheet 11 defines an elongated convex curve in the longitudinal or machine direction (as shown in section in FIG. 1) for the purpose of guiding a top run 12 of a paper machine forming wire traveling directly on the face of the sheet 11 for the full length of the sheet 11 (such wire 12 being shown essentially only as a line marked 12).
  • the wire run 12 is brought into gradual convergence with a lower wire run also shown as a line 13 in the view of FIG. 1.
  • the forming wires 12 and 13 are conventional forming wires which are mounted under tension (by means which are conventional but which are not shown) for travel at substantially the same speed and also at substantially the speed of a stock jet stream indicated partially at J at the upstream end of the forming zone which is indicated generally by the reference letters FZ at the bottom of FIG. 1.
  • FZ at the bottom of FIG. 1.
  • the wires 12 and 13 are spaced apart by a distance here designated H, which is ordinarily a very small dimension in the neighborhood of perhaps 0.2 inch up to /2 inch or in some instances as much as 1 inch or even 1 /2 inches.
  • the dimension H represents essentially the spacing from the wire 12 on the contoured surface of the sheet 11 to a D-line abscissa here indicated D,,, which is substantially longitudinally aligned with the other wire 13, as here shown, although it is primarily a straight line which functions as an abscissa for the ordinate line H here indicated.
  • H CD wherein H is the distance in inches from the wire 12 (or the surface of the sheet 11) to the abscissa line or D-line which is substantially longitudinally aligned (i.e. substantially in the direction of the wire 13); D is the distance in inches downstream from the large end of the converging forming zone (e.g.
  • this curve is the drainage curve for papermaking stock.
  • the particular drainage curve for any given type of stock will involve a certain amount of selectivity relative to the constants C and k.
  • the selection of C and k in the definition of a particular curve for the contour of the guiding surface of the sheet 11 would result in a forming zone wherein the internal pressure remains substantially constant during the drainage of the stock throughout the forming zone.
  • drainage curves are not necessarily available for each and every type of stock and may require a considerable amount of experimentation in certain instances.
  • the instant invention affords the advantage of controlling the precise contour of the sheet 11 so that an operator may arrive at a contour for the sheet 11 which does conform substantially with the ideal drainage curve and/or does achieve ideal conditions in the forming zone during operation of the machine.
  • the sheet 11 is formed of preferably comparatively thin non-corrosive material such as 0.030 inch thick stainless steel, having a transverse dimension T that is substantially that of the forming wire runs, as indicated in FIG. 2.
  • the longitudinal dimension of the sheet 11 is a total of about 25 inches, but the initially folded portion 11a and the initially curved portion 11b constitute approximately inches so that the overall dimension remaining is only about 20 or 21 inches for the controlled contour sheet portion He that is actually employed in the forming zone FZ.
  • the same comprises a top 21, a front wall 22 and a side wall 23 which has an opposite or mating back side wall 24 indicated in FIG. 2.
  • the front wall 22 carries a curved solid shoe portion 22a about which the sheet portion 11b is wrapped and the shoe 22a is carried on a plate 22b secured to the front bottom of the front wall 22 in conventional manner.
  • the side walls 23 and 24 have outwardly extending support flanges 23a and 24a welded thereto, and windows at 23b, 23c and at 24c as indicated in FIG. 2. It will be appreciated that there is another window 24b (not shown) on the back side 24 and the window in the position 23c is removed with certain parts broken away in the view of FIG. 1.
  • Such elements 23b, 23c, 240, etc. can be windows or merely bolted plates that are readily removable for purposes of selective adjustment of the elements therein which will be described in detail hereinafter.
  • a rear transverse housing element indicated generally at 25 in FIG. 1 which is indicated as mounting for limited longitudinal adjustment a rear plate 25a (via an adjustable lock nut arrangement 25b) and carried on a flange 25c.
  • the entire housing 10 carrying the sheet 11 in predetermined contour is swingably 4 mounted about a rear pivot 26 (having an opposite rear counterpart not shown) which pivot 26 is held in position by the remainder of the framing shown partially only at 27, but in an essentially conventional pivot arrangement mounted for limited vertical adjustment.
  • pivots 26 and 29 are conventional, but in the instant device it will be appreciated that in each case the pivots 36 and 39 are remote from the sheet 11 but afford swinging movement thereof relative to the wire runs 12 and 13. This type of adjustment is afforded readily by using piston-cylinder means, jack-screws, or any number of other conventional means (not shown).
  • the contour of the active portion 110 of the thin sheet 11 is controlled by a longitudinal succession of transverse bars designated 40, 50, 60, through 130, which bars 40, etc. are substantially rigid and unyielding relative to the thin sheet 11 and may be constructed of hollow or solid cross section but extend transversely substantially the transverse dimension T of the thin sheet 11 and the wires 12 and 13.
  • the transverse bars 40, 50, etc. are shown in full view in FIG. 1 as having generally rounded bottoms (e.g. designated at 70a, a, a, etc.) so that they will engage the back side of the sheet 11 along relatively uniform but comparatively thin (longitudinally) surfaces or edges, although for the full width of the back side of the sheet 11, as indicated in FIG.
  • the bars 40, 50, 60, etc. are also shown herein as being freely slidable relative to each other along the contiguous faces thereof.
  • the bars 40, 50, 60, etc are mounted in longitudinal succession (actually with contiguous faces slidably engaging each other) between a spacer 220 on the forward plate 22b and the rear plate 25a. Movement of each of the bars 40, 50, 60 is thus limited essentially to movement of each generally in a transversely aligned plane which is only approximately normal or perpendicular to the back side of the sheet 11 but is generally perpendicular to the longitudinal or machine direction and such planes are longitudinally spaced for the relative movement of the longitudinal succession of bars 40, 50, 60, etc.
  • the front and back side walls 23, 24 mount bearing sleeves 23 24 respectively, which receive stub shafts 51a, 51b, respectively, extending from the ends of a main enlarged support shaft 51.
  • the main cross support shaft 51 functions as a pivot for the rod assemblies 52 and 152 swingably mounted and carried thereby.
  • the rod assembly 52 is composed of a top apertured element 53 which has the round bearing aperture 53a that permits the same to be slidably received for swinging movement on the cross shaft 51.
  • the bottom of the rod assembly 5 2 is provided with a conventional pivot connection 54 defined by an upstanding apertured ear 54a secured to the top of the bar 50 adjacent the front side wall 23, and an apertured bifurcated member 5412 (with the pivot pin 54c interconnecting the same) extending up from the pivot connection 54 to a turn-buckle-like arrangement for con necting the top portion 53 with the bottom portion 54b of the rod assembly.
  • the turn-buckle-like element 55 is formed of a central enlarged section 55a with threaded rod connections 55b and 55a extending into threaded recesses in the top 53 and bottom 54b elements previously described and locked temporarily in position therein by the lock nuts 55d and 55a, respectively.
  • any conventional turn-buckle-type or other axially expansible or contractible element may be used in the rod assembly 52 in order to effect (by the threaded connections or otherwise) limited expansion or contraction of the rod assembly 52 so as to effect limited movement of the end of the bar 50 connected to such rod assembly 52 (toward or away from the thin sheet 11).
  • This type of adjustable rod connection 52 is substantially duplicated at the opposite end of the bar 50, adjacent the rear wall 24 by the assembly 152., wherein other elements corresponding to those already described are given the same reference numeral in the 100 series.
  • the separately and independently adjustable rod assemblies 52 and 152 afford what would appear in FIG. 2 to be a tilting type of adjustment of the bar 50 (which tilting type of adjustment is necessarily limited to that allowable by the pivotal type connections actually employed here), although such tilting type of adjustment (to the extent that it would be needed) is available.
  • the stub shafts 51a and 51b have eccentric or off-center mountings, as indicated from the side view of FIG. 1 so that by application of a rotating force to the nut head extremity 51c indicated in FIG. 1, a slight eccentric rotation of the main support cross-rod 51 is possible and this in turn will cause a very slight change in the elevation of the bar 50 relative to the thin sheet 11, and thus an adjustment of the active face of the thin sheet 11 in the immediate vicinity of the active face 50a for the bar 50.
  • This is a very fine adjustment via the eccentric stub shaft 51a and it affords a controlled and simultaneous movement of the entire bar 50 so that it will act against the entire transverse dimension of the thin sheet 1 1 which engages the active face or edge 50a for the cross bar 50.
  • the ramaining bars 60, 70, 80, etc. are all shiftable in their respective generally vertical planes in substantially the manner hereinbefore described relative to the cross bar 50.
  • By such selective, separate and independent adjusting means for each of these bars 40, 50, etc. it is possible to effect predetermined and selective changes in the contour of the active portion of the sheet 110 which will in turn guide the wire runs 12 and 13 through a different but predetermined and selected contour of convergence.
  • the sheet active portion 110 can only be anchored at the upstream end 11a or 11b, if it is to carry out the function herein required, because the relative shifting of the bars 40, 50, 60, etc. may effect a sufficient change in the contour of the sheet portion 110 as to require some very slight longitudinal shifting at the downstream extremity thereof.
  • the spacing between the active faces for the bars, e.g., 70a to 80a to 90a, etc. is so small that the structural strength of the thin sheet 110 is sufficient to bridge between these supporting surfaces and to resist pressure exerted against the sheet by stock within the forming zone FZ acting against the wire 12.
  • the general contour of the travel of the wire 12 will be in substantial conformance with the relatively smooth curve that will be defined by the active sheet portion 11c as it bridges from one active face to the next of the longitudinal succession of bars 40, 50, etc.
  • the sheet portion 11c will change its contour in response to the relative shifting of the bars 40, 50, 60, but it yields to contour changes in response to these superior forces, whereas the sheet has sufficient strength to resist the comparatively smaller forces generated within the body of the stock in the forming zone FZ so that the thin sheet portion 110 will, in fact, control the contour of the wire 12,.
  • the support and adjustable control mountings for each of the bars 60, 70, 80, etc. are indicated with the same reference numerals but in the 60, 70, 80, etc. series respectively.
  • This means e.g. the bars 40, 50, etc.
  • the adjustments available herein thus include physical displacement of the contoured sheet .11 (as a whole, via the pivot adjustments which act separately and independently of the contour adjusting bars 40, 50, etc.) and the separate and independent contour adjusting means 40, 50, etc.
  • a device for guiding a traveling porous wire comprising, a thin guiding sheet of substatnially the wire transverse dimension positioned to present to the wire a contoured longitudinally extending guide surface for engaging and guiding the travel of such wire in accordance with such contour, a plurality of transversely extending bars in longitudinal succession engaging the surface of said sheet opposite its guide surface, and separate and independent adjustable means connected to each of said bars for selectively urging each of said bars against said sheet to selectively alter the contour of such sheet guide surface.
  • adjustable means for each bar comprises transversely spaced means acting together to move opposite ends of such bar equally toward and away from said sheet.
  • said adjustable means for each bar comprises a transversely spaced pair of rods each connected to one end of the bar and a transverse backing support, each of said rods being axially expansible for acting against said backing support to independently move the end of the bar connected thereto, and each such backing support being movable to act simultaenously on both ends of a bar via the rods connecting the same therewith.
  • a pair of opposed tensioned forming wire runs traveling longitudinally from closely spaced relationship in such forming zone gradually through and to convergence, a thin guiding sheet of substantially transverse dimension of such wire runs positioned to present to one such run a longitudinally convexly contoured guide surface causing such convergence between the wire runs at such forming zones, and adjustable means positioned to present to the sheet side opposite such contoured surface a plurality of rigid members, each of said plurality of rigid members being mounted for separate and independent adjustment in longitudinally spaced generally transversely aligned planes for deforming the sheet to control such contour.
  • such adjustable means comprised a plurality of transversely extending bars positioned to present to such sheet opposite its guide surface a plurality of longitudinally spaced edges in control of the guiding contour of such sheet, primary adjusting means acting directly on each such bar for selectively actuating such bar to control such sheet contour, and secondary adjusting means acting on each such bar through connection with said primary means.
  • each adjustable means comprises a plurality of transversely extending bars positioned to present to such sheet opposite its guide surface a plurality of longitudinally spaced edges in control of the guiding contour of such sheet, primary adjusting means acting directly on each such bar for selectively actuating such bar to control such sheet contour, and secondary adjusting means

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US683225A 1967-11-15 1967-11-15 Adjustable guide for the forming zone of a paper machine Expired - Lifetime US3574055A (en)

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Application Number Priority Date Filing Date Title
US68322567A 1967-11-15 1967-11-15

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US3574055A true US3574055A (en) 1971-04-06

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US683225A Expired - Lifetime US3574055A (en) 1967-11-15 1967-11-15 Adjustable guide for the forming zone of a paper machine

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US (1) US3574055A (enrdf_load_stackoverflow)
DE (1) DE1802004A1 (enrdf_load_stackoverflow)
ES (1) ES360687A1 (enrdf_load_stackoverflow)
FR (1) FR1593051A (enrdf_load_stackoverflow)
GB (1) GB1228899A (enrdf_load_stackoverflow)
SE (1) SE347305B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720046A1 (de) * 1976-05-04 1977-11-24 Australian Paper Manufacturers Entwaesserungsvorrichtung fuer fasersuspensionen
US4324820A (en) * 1980-07-18 1982-04-13 St. Regis Paper Company Method and apparatus for coating a paper web

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3503242A1 (de) * 1985-01-31 1986-08-07 O. Dörries GmbH, 5160 Düren Vorrichtung zum fuehren der siebe einer doppelsiebpartie einer papier- oder kartonmaschine
GB2174120B (en) * 1985-04-26 1988-08-10 Doerries Gmbh Apparatus for guiding the wires of a twin wire forming section of a paper or cardboard machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720046A1 (de) * 1976-05-04 1977-11-24 Australian Paper Manufacturers Entwaesserungsvorrichtung fuer fasersuspensionen
US4324820A (en) * 1980-07-18 1982-04-13 St. Regis Paper Company Method and apparatus for coating a paper web

Also Published As

Publication number Publication date
DE1802004A1 (de) 1969-10-02
ES360687A1 (es) 1970-07-16
SE347305B (enrdf_load_stackoverflow) 1972-07-31
GB1228899A (enrdf_load_stackoverflow) 1971-04-21
FR1593051A (enrdf_load_stackoverflow) 1970-05-25

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