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US3573162A - Multi-ply paper formation - Google Patents

Multi-ply paper formation Download PDF

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Publication number
US3573162A
US3573162A US688586A US3573162DA US3573162A US 3573162 A US3573162 A US 3573162A US 688586 A US688586 A US 688586A US 3573162D A US3573162D A US 3573162DA US 3573162 A US3573162 A US 3573162A
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US
United States
Prior art keywords
ply
web
felt
wire
sequence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US688586A
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English (en)
Inventor
Jerome P Brezinski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beloit Corp
Original Assignee
Beloit Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Application granted granted Critical
Publication of US3573162A publication Critical patent/US3573162A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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

  • top main felt (as contrasted to a wire) in combination with a plurality of bottom short wires which are mounted in conjunction with certain specific guiding and dewatering devices in order to effect most efficiently the formation of the individual incipient web plies and their merger with and into a main multi-ply web carried on the top main felt.
  • the top main felt may be subjected to a number of treatments which would not be practical for a conventional forming wire, e.g., subjecting such felt with the multiply web thereon to the pressures of a conventional press nip or simply causing such felt to pass through Patented Mar.
  • the present invention provides for very simple travel paths for each of the comparatively short forming wires used in each ply-forming sequence of the device, so that the advantages of web formation on a forming wire may be obtained without many of the disadvantages or increased expenses that might be incurred relative to the use of forming wires (or plastic wires for that matter) which are expensive per se and are also expensive in terms of lost production when it is necessary to replace the same.
  • Still another extremely important advantage of the present invention resides in the felt and wire arrangements and each of the sequences which make possible the most advantageous control and handling of the water that is necessarily involved in the movement and the dewatering of stock.
  • FIGS. 1A and 1B show, in sequence, an essentially schematic elevational View of a paper machine embodying the instant invention.
  • FIG. 2 shows a schematic elevational view of essential parts of another embodiment of the instant invention.
  • FIG. 1B is a continuation from the right hand side of FIG. 1A; and in the views of FIGS. 1A and B it will be seen that there is shown certain of the main framing 10 in terms of a succession of longitudinally spaced upright frames 11a, 11b, 11c, and 11d which are secured in conventional manner to the operating floor F and which carry a main top cross beam 12 and sections of a central cross beam structure 13a, 13b, 13c, and 13d being shown connected to a secondary upright frame Me which in turn is connected by a cross frame 13s to the main upright 11d.
  • the framing 10, 11, 12, and 13 is only a skeleton for the overall structure (not shown) for mounting bearings for the various rolls shown and similar other drive and tensioning equipment conventional to paper making machines and not shown herein.
  • main top felt 14 is not shown in its entirety; but the main portion of its top run 1412 is indicated as moving from right to left in the views of FIGS. 1A and B (as indicated by arrowheads) and it will be appreciated that in a region (not shown) to the left of FIG. 1A the main top felt 14 will pass through conventional felt conditioning, pressing and tensioning devices (not shown) and it will then return again in the direction indicated by the arrows as the bottom run 14a through each of the longitudinally successive ply-forming sequences indicated at S1, S2, S3, and S4, respectively. In each such sequence S1, etc.
  • the bottom felt 14a will pick up an additional ply of web, here indicated in the case of the very first ply as P1 at the first sequence S1; after the second sequence S2, here indicated as a composite of the first two plies P12; at the end of the third sequence S3 here indicated as the composite of the three plies P123; and at the exit of the fourth sequence S4 here indicated as the ultimate composite of the four plies P1234, which is actually the integral or merged web ultimately formed in the four sequence machine here indicated and then passed upwardly into a pasting and dewatreing nip N4 between a rubber covered roll 49 and a suction drum 48.
  • the composite web is covered with a press felt 15 which is essentially conventionally mounted on guide rolls 15a through 15d, a tensioning roll 15s, and passes through wringer rolls 15 15g.
  • This felt 15 remains over the top of the composite web as itpasses on through a second dewatering nip N411 between the suction drum 48 and another rubber covered roll 49a, then on through a plain primary press nip N between a pair of rubber covered rolls 16a and 16b and on through a suction primary press N11 between a rubber covered roll 17a and a suction roll 1712, at which location the press felt separates from the top run 14b of the previously described main upper felt 14 of the machine.
  • the resultant pressed and dewatered composite web W1234 is then ordinarily carried away on the top of the top felt run 14b and taken from there by conventional pickup means (not shown).
  • a short looped forming wire 24 which may be made of the conventional woven forming wire structure but is preferably formed of a plastic Wire structure that is well known in the trade.
  • the wire 24 is functionally a paper forming wire and it is mounted more or less conventionally on guide rolls 21a through 21 which indicate 21d is a driven roll by the drive M (indicated schematically), the roll 210 as a guide roll and the roll 21b as a tensioning roll.
  • a suction box 23 having a forward curved lip portion 22 for aligning the traveling wire 24 smoothly as it approaches the active or waterpermeable surface or top 23a of the suction box 23.
  • the suction box top 23a is preferably formed of a plurality of longitudinally closely spaced transversely extending blades presenting top thin edges to the wire for defining the water-permeable surface 2301.
  • blades are shown essentially schematically at the location 23a, but it will be understood that they are longitudinally spaced from perhaps /2 to 1 /2 inches and the longitudinal dimension of the blade tops is substantially /2 to 1 inch, with the overall top arrangement having an open area of substantially greater than 50%, and preferably at least about 75% at the cover 23a. Additionally, the use of such blades at the cover 23a permits the selective positioning thereof so as to define in the longitudinal contour of the wire contacting blade edges the elongated non-circularly contoured convex curve which corresponds substantially to the drainage characteristics of the stock being fed onto the wire 24 approximately at the lip 22 or at the oncoming edge of the suction box 23 through the stock feed device 25 indicating a slice in this position.
  • the stock feed device 25 opens at a slice 25a just upstream of the suction box 23 and just beneath the top guide roll 26 so as to feed the dilute aqueous suspension of entangled co-moving fibers at a comparatively high speed in a substantially unidirectional ribbon-thin jet stream between the converging top run 24a of the wire 24 and the bottom run 14a of the main felt 14.
  • the bottom felt reach 14a between the rolls 26 and 27 is mounted, of course, under tension but is free from restraining means in contact therewith opposite the actual ply-forming area F2 (indicated as an approximate dimension). Because the felt 14a is carrying at least one ply of web (in this case the initial ply P1) as it passes opposite the forming zone F2, it will be appreciated that the bulk of the dewatering of the stock fed from the inlet 25 will occur through the water-permeable top 23a of the suction box 23, i.e., so as to form an incipient ply on the wire top run 24a in the forming zone F2, which incipient ply merges with the ply P1 carried on the underside of the felt 14a to form an ultimate composite web P12 in which dewatering continues through the comparatively brief generally parallel travel between the felt 14a and the wire top 24a at least to the third guide or roll 27.
  • the roll 27 is a rubber covered solid roll which will tend to lift the composite web P12 on the underside
  • the guide rolls 26 and 27 will actually hold the felt 14a in tension down against the wire top run 24a in a generally yieldable manner, because the felt with the initial ply P1 thereon will tend to yield some to the internal forces in the stock jet initially fed into the large end of the converging forming area F2. But at the offrunning side of such forming area F2 the felt 14a and wire run 24a are squeezed together sufficiently to effect a certain amount of dewatering and the merging of the plies in the manner hereinbefore described.
  • the composite multi-ply web P12 traveling from the second sequence S2 on the underside of the felt 14a is then fed through a dewatering nip N2 between a rubber covered roll 29 and an open roll 28 provided with a saveall 28a.
  • the open roll 28 is provided with a fairly close weave and the plain rubber covered roll 29 will cooperate with the backside of the felt 14a to assure continued travel of the web away from the off-running surface of the open roll 28 and with the down-running felt reach 14a feeding into the next sequence S3.
  • the fourth sequence S4 functions similarly to the third sequence and it will be recognized that corresponding elements are designated by the same reference numerals in the 40 series.
  • FIG. 2 it will be seen that there are shown two sequences which might correspond to those designated in FIGS. 1A and B, except for certain differences which will be explained, and for the sake of consistency such sequences will be designated S7 (shown partially), S8 and S9. Parts in these sequences S7, 8 and 9 which correspond substantially to parts already shown in FIGS. 1A and 1B are designated by the same reference numerals in the 7 0, and series, respectively. It will be noted that the main felt top run here designated 200 has a somewhat simplified travel in the embodiment of FIG. 2 by virtue of the elimination of some of the elements shown in the embodiment of FIGS. 1A and B.
  • the felt 200 travels around an initial guide roll 85 with a ply P7 on the underside thereof and into gradual convergence with the top run 84a of the wire 84 over the forming Zone F8 between the wire run 84a and the felt 200.
  • the wire and felt 84a, 200 traveling in parallelism with the composite web P78 therebetween pass on up to a nip N8 between a wire guide roll 81 and a conventional rubber covered roll '89.
  • This arrangement for the nip N8 does serve to avoid rolls corresponding to reference numerals 87 and 88 in the sequence S8 here shown, since the rubber covered roll 89 carries out the essential function already described in connection with the sequence S2 for the rolls 27 and 28.
  • the wire 84 must pass through the nip N8 and this requires a certain amount of additional care in the operation of the nip N8 to avoid the possibility of damage to the wire 84.
  • top felt 14 and 200 could be a plastic forming wire also, at least in the sense of using the same in press nips for dewatering of the web, but the practicality of this type of arrangement would ordinarily be questioned since the forming wire function is actually not required for the top felt 14- or 200 in the embodiments here shown. Instead, the top felt 14 and 200 will in each case carry plies of web thereon such that formation of new webs or plies by drainage through such felts with pre-formed paper webs thereon will not occur to any significant extent, and there would be no practical advantage to attempting to use a fabric wire in this position in most instances. In fact the much less expensive felt in the positions 14 and 200 affords distinct advantages in the practice of the instant invention.
  • FIG. 2 the alignment of the various elements is shown so that the main felt 200 may travel with a minimum of abrupt changes in direction and also the advantages generally afforded in the practice of the instant invention of employing devices which are capable of being shifted to some extent in their relative positions becomes apparent.
  • the suction boxes 83 and 93 may be tilted upwardly as shown or downwarly, if desired, in a particular arrangement to suit the convenience of the particular operation.
  • the main felt 14 or 200 offers a primary advantage with respect to its ability to conform to various configurations in ordinary use and travel, but, because of the short wires used in each of the sequences in order to achieve certain advantages, as will become apparent to those skilled in the art.
  • S8 shown in FIG.
  • the convergence of the felt 200 and the wire 84 will occur primarily as the guide roll 86 brings the felt 200 into closely spaced relation with the wire traveling over the guiding top surface of the suction box 83, and the cooperation between the two rolls 89 and 81 at the off-running side will effect convergence and substantially parallelism between the top wire run 84 and the felt 200 with the Wet web sandwiched therebetween.
  • a device for forming a multi-ply web comprising in combination, spaced first guides at a first forming zone, a felt run for carrying a web ply wrapping one of said first guides, a forming wire run opposing said felt run wrapping the other of said first guides, first slice means for delivering a dilute aqueous suspension of entangled comoving fibers exiting from the slice as a high-speed substantially unidirectional ribbon-thin jet stream with said runs traveling substantially at the jet stream speed (a) over said guides and through.
  • the guides for the wires comprise suction boxes for maintaining subatmospheric pressure across the wire runs in said forming zones to accelerate dewatering therethrough.
  • the guides for the wire runs are constructed with a plurality of longitudinally closely spaced transversely extending blades presenting top thin edges to the wires for defining the waterpermeable surfaces of the guides.

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  • Paper (AREA)
US688586A 1967-12-06 1967-12-06 Multi-ply paper formation Expired - Lifetime US3573162A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68858667A 1967-12-06 1967-12-06

Publications (1)

Publication Number Publication Date
US3573162A true US3573162A (en) 1971-03-30

Family

ID=24764997

Family Applications (1)

Application Number Title Priority Date Filing Date
US688586A Expired - Lifetime US3573162A (en) 1967-12-06 1967-12-06 Multi-ply paper formation

Country Status (6)

Country Link
US (1) US3573162A (fr)
DE (1) DE1808403A1 (fr)
ES (1) ES361482A1 (fr)
FI (1) FI52479C (fr)
FR (1) FR1599877A (fr)
GB (1) GB1245453A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4324820A (en) * 1980-07-18 1982-04-13 St. Regis Paper Company Method and apparatus for coating a paper web
US4614566A (en) * 1982-03-02 1986-09-30 Valmet Oy Web-forming section in a paper machine
US5445713A (en) * 1993-01-14 1995-08-29 Mitsubishi Jukogyo Kabushiki Kaisha Apparatus for use in making multilayered paper
US5456803A (en) * 1993-03-24 1995-10-10 Sk Engineering Ltd. Papermaking apparatus and multi-layer paper forming apparatus
US5556513A (en) * 1993-07-15 1996-09-17 Mitsubishi Jukogyo Kabushiki Kaisha Multi-layer paper sheet forming system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH559282A5 (fr) * 1972-12-11 1975-02-28 Escher Wyss Gmbh

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4324820A (en) * 1980-07-18 1982-04-13 St. Regis Paper Company Method and apparatus for coating a paper web
US4614566A (en) * 1982-03-02 1986-09-30 Valmet Oy Web-forming section in a paper machine
US5445713A (en) * 1993-01-14 1995-08-29 Mitsubishi Jukogyo Kabushiki Kaisha Apparatus for use in making multilayered paper
US5456803A (en) * 1993-03-24 1995-10-10 Sk Engineering Ltd. Papermaking apparatus and multi-layer paper forming apparatus
US5556513A (en) * 1993-07-15 1996-09-17 Mitsubishi Jukogyo Kabushiki Kaisha Multi-layer paper sheet forming system

Also Published As

Publication number Publication date
FI52479C (fi) 1977-09-12
FI52479B (fr) 1977-05-31
FR1599877A (fr) 1970-07-20
GB1245453A (en) 1971-09-08
ES361482A1 (es) 1970-11-01
DE1808403A1 (de) 1969-07-03

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