US3281313A - Stock removing slice for paper making machine and method of making paper - Google Patents

Stock removing slice for paper making machine and method of making paper Download PDF

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Publication number
US3281313A
US3281313A US300215A US30021563A US3281313A US 3281313 A US3281313 A US 3281313A US 300215 A US300215 A US 300215A US 30021563 A US30021563 A US 30021563A US 3281313 A US3281313 A US 3281313A
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United States
Prior art keywords
stock
gap
active
web
wire
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US300215A
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English (en)
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Attwood Brian William
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St Annes Board Mill Co Ltd
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St Annes Board Mill Co Ltd
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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
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/07—Water collectors, e.g. save-alls

Definitions

  • This invention relates to an endless web forming machine such as a paper or paperboard making machine and to a method of making an endless web of felted fibers. More particularly, the invention relates to a machine and method for making an integral felted-fiber web of the desired thickness and of improved formation characteristics such that the web has a more uniform, high-strength upper and lower surface yet is free from any tendency to delaminate.
  • My present invention greatly reduces and even eliminates in many instances the troublesome result just noted. This is accomplished by removing excess stock from the pond, or ponds, so as to limit the height of the pond to the optimum height of stock on the main forming wire that can be accommodated by the gap that marks the entrance of the stock to the zone where it is squeezed between cooperating active runs of the forming wires and the del nited States Patent 3,28 l ,3 l 3 Patented Get. 25, 1966 "ice watering occurs.
  • the excess of stock in the pond, over and above the optimum height, may be removed or such excess may be prevented in various ways, as by means of devices having stock-diverting openings, mouths, or barriers positioned in the ponds at the proper level, so that stock above such proper level is diverted and removed and the level is maintained at the optimum point for efficient operation of the machine.
  • a given board making machine employing such means can be operated to give paperboard of higher basis weight and/ or of greater thickness than had heretofore been possible.
  • FIGURE 1 is a fragmentary, diagrammatic view, illustrating the wet end, or web-forming section, of a machine embodying the principles of my invention and useful for manufacturing a two-ply board;
  • FIGURE 2 is an enlarged, fragmentary view, partly in side elevation and partly in section, of the preferred embodiment of my invention illustrated diagrammatically in FIGURE 1;
  • FIGURE 3 is a fragmentary, side elevational view of a second embodiment of my invention.
  • FIGURE 4 is a fragmentary, side elevational view of a third embodiment of my invention.
  • FIGURE 5 is a broken, front elevational view taken substantially along the lines VV of FIGURE 2;
  • FIGURE 6 is a fragmentary, side elevational view of a fourth embodiment of my invention.
  • FIGURE 7 is a broken, top plan view of the stockdiver-ting device of FIGURE 6.
  • the reference numeral 10 indicates generally a stock flow box, or head box, from which stock is fed onto a main forming wire 11 in a flowing, open top stream, or layer, indicated by the reference character 12.
  • Said main forming wire 11 extends as an endless loop between a breast roll 13 at the feed end and a couch roll 14 at the delivery end of the web-forming section of the machine.
  • Said wire 11 as is usual in Fourdrinier type machines, is in the form of an endless band or loop, with its upper run 11a supported by a plurality of rollers between the breast roll 13 and the couch roll 14.
  • rollers 80 permit pressure to be applied to the partly formed web as it is carried along above them, for instance, by upper rollers 17.
  • Guide and tension rollers 16 cooperate with the lower run 116 of said wire in a conventional manner.
  • a second head box a is positioned downstream from the head box 10 for supplying additonal stock, indicated by the reference numeral 12a, onto the active upper run 11a of the forming wire.
  • An upper forming wire is positioned downstream from the head box 10 in cooperative relationship with the first set of rollers 15, 80.
  • Said upper, or top forming wire, 21, is also in the form of an endless loop, with its lower active run 21a extending from a roll 22, which may be either a permeable or impermeable roll, positioned in fairly closely spaced relationship to the feed box 10, and a second roll 23 located downstream from said roll 22.
  • the upper return run 2112 of the top wire 21 is trained over and under a plurality of supporting and guiding rolls 24.
  • a second top wire in all respects similar to the top wire 21, serves a similar function with respect to a second section of the main forming Wire 11 and rolls a, 17a and 80a.
  • the lower run 25a of said second top wire 25 extends between a roll 26, spaced in fairly close relationship to the second head box 1011, and a second roll 27 mounted downstream above and in substantial alignment with the couch roll 14.
  • the roll 22 is mounted in slightly spaced relation to and above the active upper run 11a of the main forming wire 11, and above an unsupported portion of said run 11a lying between a pair of spaced table rolls 15.
  • the lower or active run 2111 of the top forming wire 21 provides a gap, indicated at G, between said active runs 11a and 21a of the respective main and top forming wires.
  • the gap G is preferably of very low height (e.g. 1"), but it varies from gap to gap, that is to say, according as to whether it controls the first layer of stock or a subsequent layer and according to the consistency of the stock being fed.
  • the height of the gap G has been exaggerated in the drawings for purposes of clarity.
  • the pond of stock 12 previously referred to, forms ahead of the mouth of said gap G and flows into the gap to fill the same and to fill the space of gradually decreasing height between the converging portions of the active runs 21a and 11a of the top and main forming wires. Said converging portions are brought itno a state of convergency, except for the layer of stock therebetween, by a de-watering device, indicated generally by the reference numeral 30, which will be more fully described in connection with FIGURE 2.
  • the dewatering device 30 By means of the dewatering device 30, the water and such fine fibers as can pass through the meshes of the active run 21a of the top forming wire 21 are removed upwardly from above the upper surface of said active portion 21a.
  • the pressure of the de-watering device 30, which presses on an unsupported section of the wires 21 and 11, is such that a major portion of water is removed from the stock.
  • the web passes downstream from beneath the edge 52 the web is formed to the extent that the fibers assume a structural relationship to one another that thereafter remains substantially unaltered.
  • the resulting Web thereafter is squeezed between the upper and lower sets of rolls 17 and 80.
  • said rolls 17 are permeable, as is also the roll 22.
  • a second de-watering device indicated generally by the reference numeral 30a, for effecting a dewatering of the stock flowing from the pond 12a into the converging gap between the main forming wire active run 11a and the active run 25a of the top forming wire 25.
  • the active run 1111 of the main forming wire moves beyond the roll 23, it carries on its upper surface a web W.
  • Such web as a result of the first de-watering operation at the device 30 and the pressure of the rolls 17, 80, has a fiber content of the order of 15% by weight on a bone dry basis and is composed of fibers that have become interfelted or interlocked in substantially the same way and to substantially the same extent that the fibers are interfelted and interlocked in the final sheet when dried. Consequently, as the fresh supply of stock, indicated at 12a, flows from the second head box 10a, such fresh supply of stock flows on top of the already partially formed web W, with the result that drainage of the water downwardly through the active run 11a of the main forming wire 11 is greatly slowed down.
  • the preferred embodiment of the stock removal device of my present invention represented generally by the reference numeral 40, includes a suction conduit 41 that extends transversely and above the active run 11a of the main forming wire 11.
  • Said conduit 41 may be suitably supported at its ends, as by means of brackets 42 attached to a wall of the head box 1011 from hangers 43 dependently carried by said brackets 42 and vertically adjustable with respect thereto.
  • each of the hangers 43 may have a threaded shank 44 in threaded engagement with an internally threaded bore 45 in each bracket 42.
  • Horizontal adjustment of the conduit 41 may also be provided by forming each of said brackets 4-2 of a plurality of relatively extensible slotted portions that can be clamped by means of a wing nut and bolt 45a in the desired extended position.
  • a source of suction (not shown) is connected at one or both ends of the conduit 41 by means of a pipe, or pipes 46.
  • the conduit 41 has a transversely extending and slightly downwardly inclined extension 47 terminating in a lower opening, or mouth, as at 48, defined by edges which lie substantially in a horizontal plane when the conduit is in its adjusted position.
  • the extension 47 may suitably comprise a pair of relatively closely spaced plane walls with the lower of the Walls coming off tangentially from the generally cylindrical conduit 41 and defining a stock-removal passageway into the interior of said conduit 41.
  • the open layer of stock indicated at 12a tends to build up in advance of the gap G-l, to a level such as that indicated by the dotted line 49, or even higher, that would normally continue to closely adjacent the lower surface of the roll 26.
  • the level 49 will depend in part upon the speed of travel of the main forming wire 11, the composition of the stock furnish and other factors that have an effect upon the permeability of the Web W at this point to the water tending to drain by gravity through the web W and the active forming wire run 11a. Whatever the cause, the tendency is for the level 49 to rise above the top of the gap G-1 and to form a pond P upstream therefrom. The pond P sometimes runs back almost as far as the feed box 10a.
  • the stock removal device 40 which is preferably adjusted while the machine is operating.
  • the lower mouth 48 of the extension 47 limits the height of the pond P. It is usually found preferable to permit a small pond to remain at the entrance to the gap G1 because this insures that suflicient stock passes into said gap to provide a webof the consistency and thickness desired.
  • the device 40 is set so that its mouth 48 is at the highest depth desired for the pond.
  • a typical upper level for the stream of stock is indicated by the dotted line 50 in FIGURE 2.
  • the excess of stock over that required to provide the web is drawn off by the device 40 and is returned to the stock box for reuse, or to some prior part of the machine for redelivery to the stock box.
  • the lower active run 25a of the top forming wire 25 is inclined gradually downwardly toward the active run 11a of the main forming wire 11, until said active run 25a reaches a scraper board, or doctor 51, forming a part of the de-watering device 30a.
  • Said doctor 51 is preferably a thin board that inclines upwardly and downstream from its lower wire-engaging straight edge 52.
  • the water so picked up is discharged into a collecting trough 53.
  • the trough is connected by one or more pipes 54, usually through a pump (not shown) back to the head box a, or to a stock chest in advance of the machine for the return of the white water for reuse in the web making process.
  • a pump not shown
  • the upper layer is substantially dewatered to form a well defined web in which the fibers are felted and interlocked much to the same extent as in the final board, but without any distinct planes of separation between the strata such that delamination can be easily effected.
  • the web is relatively uniform and of an integral character.
  • the straight edge 52 lies over an unsupported port-ion of the cooperating active runs 11a and 25a of the wire. After passing from under the straight edge 52, the cooperating runs of wire pass over a roll 80a, which is similar to the corresponding one of the lower rolls 80, and thence into the second group of rolls 17a, 80a.
  • the now-unsupported web W is ready for delivery to the first press section of the board making machine or to another main forming wire constituting a portion of a further web-building section similar to the section 1%, 2 5, 40 already described.
  • FIGURE 3 wherein similar elements of the machine are designated by the same reference numerals as in FIG- URES 1 and 2, a suction conduit 60, instead of being supported froma wall of a head box as was the suction conduit 41, is supported from a non-rotating stub shaft 61 coaxial with the axis of the roll 26.
  • Bracket arms 62 having at their inner ends split clamping portions 63 and bolt tightening means 64 and having at their free ends conduit engaging portions 65, serve to support said conduit 60 for adjustment about the stubshaft as a pivot point.
  • conduit 60 is connected to a source of suction (not shown) to draw off stock from the pond P immediately ahead of the mouth of the gap G-2 to maintain the predetermined optimum level 50.
  • a pair of stationary deckle boards '70 having apertures 71 in horizontal alignment at the optimum pond level serve to maintain the desired level 50 at the gap G-3.
  • the apertures 71 are in open flow communication with a suction manifold 72 for aiding in withdrawing stock laterally from the pond P and maintaining the height thereof at the optimum level 50.
  • FIGURES 6 and 7 illustrate another embodiment of my invention in which a slice or scraper is directed towards the head box 10a so that it acts to skim off stock in a pond above a predetermined height.
  • the slice comprises a plate-like member 81 extending across the wire 11a having an upstanding wall 82 that is curved transversely so as to deflect surplus stock to each side of the wire 11a, where it is collected for reuse.
  • the improved results previously referred to can be realized.
  • the paper making machine is operated at between 150 and 400 per min., it is possible when a mechanical, or ground wood pulp is used, by forcing more stock on to the wire, to obtain up to a maximum of 50% increase in basis weight over that obtainable without the use of my stock-removal attachment.
  • the operating range of a normal machine of this type may be extended by allowing boards of higher basis weights to be produced, by improving formation, by permitting the machine to operate at lower speeds and permitting lower consistencies of stock to be used. These improvements may be obtained either individually or in combination.
  • an endless web making machine including a main forming wire having an active upper run, a plurality of stock inlets at longitudinally spaced intervals along said upper run to supply stock thereto, a top wire for each of said inlets having an active bottom run starting adjacent the corresponding inlet and converging toward said main forming wire downstream from said inlet, means at said downstream position for pressing said converging active runs of said Wires towards each other thereby forming a gap of progressively decreasing height and squeezing stock therein, and means for driving said wires so that their respective converging active runs travel in the same direction, the improvement which comprises means positioned upstream of said gap and extending thereinto for limiting the height of stock immediately ahead of the starting point of at least one of said active bottom runs by the removal of stock in advance of the corresponding gap.
  • an endless web making machine including a main forming wire having an active upper run for receiving stock thereon for drainage therethrough, a plurality of stock inlets at longitudinally spaced intervals along said upper run, a roll downstream from one stock inlet other than the first mounted for rotation in vertically spaced relation to said active upper run, a top wire trained around each said roll to provide an active lower run of wire converging toward said main forming wire active run downstream of said rolls, means at said downstream position for pressing the respective portions of said active runs towards each other thereby forming a convergent gap between said portions for receiving stock and squeezing the stock therebetween to de-water same, and means for driving said active wire runs in the same direction and at the same speed, the improvement which comprises a pair of deckle boards having longitudinally spaced apertures at about the level of said maximum height for removing stock from above said main forming wire ahead of at least one of said convergent gaps but downstream of its stock inlet to maintain the level of the remaining stock at a predetermined maximum height at the entrance to said gap
  • an endless web making machine including a main forming wire having an active upper run, a stock inlet to supply stock to said upper run, a top wire having an active bottom run converging toward said main forming wire downstream from said inlet to form a stock-filled gap of progressively decreasing height downstream, means for driving said Wires so that their respective converging active runs travel in the same direction and means pressing the respective converging active runs of said wires toward each other to squeeze the stock therebetween, the improvement which comprises means upstream of said gap and extending into said gap for limiting the height of stock immediately ahead of the starting point of said active bottom run by the removal of stock in advance of the stock-filled gap.
  • said height-limiting means is a suction device having a stock-removing opening positioned immediately ahead of said gap and at approximately the predetermined maximum height level of the stock that is to be maintained above said main forming wire.
  • said height-limiting means comprises a suction conduit extending the full width of the main forming wire and spaced thereabove and in advance of said corresponding gap and having a stock-removing portion extending toward said corresponding gap and having an opening at a point approximately that of the predetermined height level of stock that is to be maintained in advance of said gap.
  • a method of making a fibrous web which includes advancing an open top layer of stock into the mouth of a converging gap between a top forming wire and a bottom forming wire, advancing the forming wires with the stock therebetween and squeezing said wires toward each other to de-water said stock and form said stock into a web, the improvement which comprises the steps of delivering stock in excess of that required to make the web and controlling the height of said open top layer of stock immediately in advance of said converging gap by the removal of stock from within the gap itself.

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US300215A 1963-01-30 1963-08-06 Stock removing slice for paper making machine and method of making paper Expired - Lifetime US3281313A (en)

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GB3744/63A GB975613A (en) 1963-01-30 1963-01-30 Improvements in or relating to machines for making paper,paper-board or similar fibrous products

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US3281313A true US3281313A (en) 1966-10-25

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US (1) US3281313A (da)
AT (1) AT265842B (da)
CH (1) CH420834A (da)
DE (1) DE1461151A1 (da)
DK (1) DK111136B (da)
ES (2) ES295845A1 (da)
GB (1) GB975613A (da)
LU (1) LU45324A1 (da)
NL (1) NL6400747A (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478684A (en) * 1982-07-14 1984-10-23 Escher Wyss Gmbh Papermaking machine stock trim deflecting device
US20050045299A1 (en) * 1998-02-06 2005-03-03 Franz Petschauer Process and a device for the formation of fiberboard

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139261B (en) * 1982-11-25 1986-09-03 Beloit Corp Method and device for controlling the edge of a paper web formed on a travelling foraminous wire

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1662226A (en) * 1926-05-24 1928-03-13 Jr George S Witham Paper-making machine
US1818777A (en) * 1927-05-26 1931-08-11 Beloit Iron Works Paper making machine
US1889819A (en) * 1930-06-02 1932-12-06 Beloit Iron Works Method and means for delivering stock for web forming
US2193032A (en) * 1937-01-16 1940-03-12 Eastman Kodak Co Suction slice for paper making machines
US2821120A (en) * 1952-08-22 1958-01-28 St Annes Board Mill Co Ltd Dewatering pulp or stock on a paper or boardmaking machine
US2881676A (en) * 1955-05-18 1959-04-14 St Annes Board Mill Co Ltd Paper or board machine and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1662226A (en) * 1926-05-24 1928-03-13 Jr George S Witham Paper-making machine
US1818777A (en) * 1927-05-26 1931-08-11 Beloit Iron Works Paper making machine
US1889819A (en) * 1930-06-02 1932-12-06 Beloit Iron Works Method and means for delivering stock for web forming
US2193032A (en) * 1937-01-16 1940-03-12 Eastman Kodak Co Suction slice for paper making machines
US2821120A (en) * 1952-08-22 1958-01-28 St Annes Board Mill Co Ltd Dewatering pulp or stock on a paper or boardmaking machine
US2881676A (en) * 1955-05-18 1959-04-14 St Annes Board Mill Co Ltd Paper or board machine and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478684A (en) * 1982-07-14 1984-10-23 Escher Wyss Gmbh Papermaking machine stock trim deflecting device
US20050045299A1 (en) * 1998-02-06 2005-03-03 Franz Petschauer Process and a device for the formation of fiberboard

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DK111136B (da) 1968-06-10
GB975613A (en) 1964-11-18
LU45324A1 (da) 1964-03-31
ES295845A1 (es) 1964-07-01
NL6400747A (da) 1964-07-31
ES299882A1 (es) 1964-11-16
CH420834A (fr) 1966-09-15
DE1461151A1 (de) 1968-12-12
AT265842B (de) 1968-10-25

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