US3578558A - Twin wire paper making assembly - Google Patents
Twin wire paper making assembly Download PDFInfo
- Publication number
- US3578558A US3578558A US706514A US3578558DA US3578558A US 3578558 A US3578558 A US 3578558A US 706514 A US706514 A US 706514A US 3578558D A US3578558D A US 3578558DA US 3578558 A US3578558 A US 3578558A
- Authority
- US
- United States
- Prior art keywords
- webs
- wires
- forming
- stock
- forming zone
- 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
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Classifications
-
- 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
- This invention has particular relation to twin wire paper making machines wherein the wires move in a gradually converging path guided by spaced breast and couch rolls which define a forming zone therebetween. Machinery of this type is shown in the United States patent of Baxter No. Re 25,333, issued to the assignee of this invention.
- Green et al. No. 3,215,593 also issued to the assignee of this invention, provides more pertinent background for the present invention.
- Green the paper stock is fed from the chest to a headbox which floods the space above the nip between the spaced breast rolls. This allows the forming wires to draw into the forming zone as much paper stock as the space between the wires will permit. It requires the use of baffles immediately below the nip and behind the wires to prevent the reduced pressure in this space from drawing water through the wires at this point. Moreover, at very high speeds it is difiicult to obtain complete uniformity of the thickness of the sheet produced because of the manner in which the stock is transferred to the forming zone.
- This invention is directed to improvements in the method and apparatus for feeding paper stock to the forming zone of a high speed twin wire vertical paper making machine.
- the method and apparatus effect the forming of a controlled stream of stock of preset uniform thickness along its entire length which is equal to the width of the forming wires.
- the distance between the Wires at the top of the forming zone is carefully regulated to be equal to or greater than the width of this preset thickness so that the stream passes between the breast rolls and into the upper portion of the forming zone before there is any substantial contact with the wires.
- a single regulating bar is provided on the rear side of one of the wires for establishing the distance between the wires at the entrance to the forming zone.
- FIG. 1 is a side elevation view illustrating diagrammatically one form of the paper making apparatus constructed in accordance with the invention
- FIG. 2 is an enlarged fragmentary side view of the slice outlet adjacent the breast rolls;
- FIG. 1 shows the general construction of a paper machine 10 including a pair of breast rolls 11 and 12 supported in horizontally spaced relation to define a nip 13 therebetween.
- a pair of couch rolls 14 and 15 are mounted below the breast rolls 11 and 12, and a pair of forming webs or wires 16 and 17 are looped around the respective pairs of breast and couch rolls 11-14 and 12-15, as shown in FIG. 1.
- the couch rolls 14 and 15 may be driven by suitable means (not shown) to cause the wires to travel downwardly through the nip 13 at precisely regulated speeds toward and around the couch rolls 14 and 15.
- the Wires 16 and 17 define a forming zone 20 therebetween into which stock is continuously delivered from a headbox 22 mounted above the forming zone in position to deliver stock continuously from a supply pipe 23.
- a headbox 22 mounted above the forming zone in position to deliver stock continuously from a supply pipe 23.
- the present invention is described in the context of a vertically oriented twin-wire paper making machine, it has application in environments in which the forming zone defined by the opposed reaches of the forming wires is disposed other than vertically.
- Each of the forming wires 16 and 17 is guided through an endless path by guide means in the form of fixed guide rolls 25, and the movable guide rolls 26 are provided for tensioning each wire in accordance with conventional wire tensioning practice.
- Each of these rolls is carried by suitable bearing means (not shown) mounted on the machine frame.
- the spaces 28 within the loops of the traveling wires 16 and 17 are open to the atmosphere, and include the drainage containers 29 for receiving water from the adjustable deflector assemblies 30 which flows through the conduits 32 to a position remote from the machine.
- These deflector assemblies are preferably of the type described in the copending application Ser. No. 711,583, filed Mar. 8, 1968, also assigned to the assignee of this invention, although they can take other forms or be eliminated without departing from the scope of this invention.
- a suction box 34 is provided immediately above the left hand couch roll 14 for loosening the newly formed paper web from the right-hand forming wire 17 and causing it to adhere to the left-hand wire 16 as it proceeds around the couch roll 14 to the roll 35, which transfers it to the felt 36 for subsequent processing.
- the headbox 22 is supported on the machine frame and extends across the width of the frame above and coextensive in length with the nip 13 between the breast rolls 11 and 12. It includes a pressure chamber 40 having side walls 41 and sloping bottom walls 42 converging downwardly to a series of vertical tubes 43 which conduct the stock into a V-shaped chamber 44.
- Stock is supplied to the pressure chamber 40 from the inlet manifold 45 which extends along the right-hand side of the headbox 22 and has a series of connector pipes 46 closely spaced along the entire length thereof to connect the interior thereof to the pressure chamber 40.
- a perforated rectifier roll 48 is mounted for rotation in the pressure chamber.40 immediately above the entrance to the vertical tubes 43 for evenly distributing the flow into these tubes and creating eddy currents of relatively small magnitude immediately adjacent the upper ends of the tubes.
- the V-shaped receiving chamber 44 is defined by tapering side walls 51 and 52 which have the parallel slice lips 53 and 54 mounted on their lower ends to provide a slice outlet passage 55 in which a controlled stream of stock is formed and directed into the nip 13 between the forming webs 16 and 17. Both walls 51 and 52 and the lips 53 and 54 extend across the entire width of the paper machine, and end walls (not shown) are provided on the opposite ends thereof to prevent leakage of the stock from the chamber 40.
- the right-hand side wall 52 and slice lip 54 are movable with respect to the stationary left-hand wall 51 and lip 53 to permit changes in the width of the slice passage 55.
- the movable slice wall 52 has horizontal pivot connections on its upper and lower edges to permit movement of the movable lip, and the links 56 complete a parallelogram which restricts movement of the lip 54 so that it always remains in a vertical plane.
- This structure is described in the copending application Ser. No. 703,299 filed Feb. 6, 1968, which is also assigned to the assignee of this invention. While other forms of headboxes may be used, it is important that the headbox form a continuous stream of stock having a uniform thickness, as will be further described.
- the regulating bar 60 (FIG. 4) is mounted immediately below the nip 13 for regulating the distance between the forming wires 16 and 17 at the entrance to or top of the forming zone 20.
- This bar is mounted on the machine frame on a bracket 61 which supports the bearing for one end of the breast roll 12.
- a downwardly extending end member 62 is secured by the bolts 63 to this bracket 61, and it includes the annular bearing support 64 on the lower end thereof which receives the stub shaft 65 on the end of the cylindrical cross member 66.
- This cross member has the coextensive support bar 67 rigidly secured thereto which in turn receives and supports the regulator bar 60 in the cut out portion 68 thereof.
- the screws 70 secure the regulator bar 60 in place so that it can be removed and replaced with ease.
- the support bracket 67 is positioned on the upper portion of the cross member 66 to enable the bar 60 to extend upwardly and have contact with the Wire 17 at a point close to the point at which this wire separates from the breast roll 12.
- the regulator bar 60 has a round nose 7-2 against which the wire 17 rides, and which does not remove any substantial amount of water from the rear side of the adjacent wire because there is little or no stock in contact with the wire at this point, and the round nose of the bar tends to force liquids back through the wire.
- the bar 60 performs primarily the purpose of regulating the distance between the wires 16 and 17 at the entrance to the forming zone 20.
- the regulating bar 60 is pivoted about the axis of the cross member '66 to change the position of the web 17 and thus to alter the width of the forming zone.
- This adjustment is accomplished by rotating the screw 74 which extends through the arm 75 on the right-hand end of the cross member 66 and into contact with a flanged member 76 mounted on the machine frame 50.
- the cross bar can be rotated to effect a change in the position of the regulator bar and the wire 17.
- the controlled stream 80 is ejected at high speeds from the slice outlet and moves downwardly between the gradually converging forming webs 16 and 17 toward the forming zone 20.
- the entrance to the forming zone 20 is created at the regulator bar 60 which is precisely positioned to determine the distance between the forming wires 16 and 17. This width is carefully controlled so that it is at least equal or slightly greater than the width of the controlled stream 80, and as a result, the controlled stream does not have any substantial contact with the forming webs 16 and 17 until it enters the forming zone.
- the wires 16 and 17 be moving at a speed substantially equal to the controlled stream 80 so that there is little or no relative movement therebetween.
- the regulator bar 60 is shown as being manually adjustable to move the position of only one of the wires, but it is within the scope of this invention to provide regulating bars for positioning both of the forming wires at the entrance to the forming zone and it is also possible to eliminate completely the regulating bars and to permit the breast rolls and deflectors to determine the width of the forming zone at the entrance thereto. It is, however, an important consideration that the width of the forming zone at the entrance thereto be wider than the thickness of the controlled stream and that the entrance to the forming zone be spaced below the point at which the wires leave the surface of the breast rolls to eliminate the need for a seal in this area.
- the regulating bar can be adjusted automatically or by other manual means, and it is possible to control automatically the speed of the wires to correlate the same with the speed of the stream of stock so that the relative movement therebetween remains constant.
- other types of headboxes can be utilized so long as the controlled stream of uniform thickness is forced downwardly into the forming zone midway between the forming webs or wires.
- the invention has accordingly provided an improved method and apparatus for making paper in a twin wire vertical paper making machine by creating and forcing a controlled stream of stock having a uniform thickness downwardly into the forming zone.
- the entrance to the forming zone is controlled precisely so that it is greater than the thickness of the slice to eliminate any substantial contact between the stock and the forming webs above the forming zone.
- the relative rate of movement of the controlled stream and the forming wires can be precisely regulated to vary the relative movement therebetween at the point of contact therebetween.
- a multi-Wire papermaking machine comprising a pair of endless forming webs each constituting a closed loop, support means including a pair of spaced parallel breast rolls forming a nip of predetermined Width and positioned within each of said loops to support said webs in opposed Inns defining a forming zone having an upstream end and a downstream end, said breast rolls positioned at said upstream end means for depositing papermaking stock in said forming zone at a point adjacent said upstream end thereof, means positioned within each of said loops and in contact with said runs of said webs guiding said runs into gradually converging relation toward said downstream end of said forming zone, and a regulator bar positioned within one of said loops in engagement with one of said webs at a point intermediate said breast roll and said guide means associated therewith in forcing relation with said one of said webs toward the other of said webs estab- References Cited UNITED STATES PATENTS 3,215,594 11/1965 Baxter Jr.
Abstract
D R A W I N G
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70651468A | 1968-02-19 | 1968-02-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3578558A true US3578558A (en) | 1971-05-11 |
Family
ID=24837947
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US706514A Expired - Lifetime US3578558A (en) | 1968-02-19 | 1968-02-19 | Twin wire paper making assembly |
Country Status (1)
Country | Link |
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US (1) | US3578558A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3847731A (en) * | 1970-11-16 | 1974-11-12 | H Arledter | Twin wire paper making method in which controlled dewatering in tapering gap causes suspension to move at speed of wires |
US3972771A (en) * | 1974-02-28 | 1976-08-03 | The Black Clawson Company | Headbox with variable eddy decay length |
US4235667A (en) * | 1979-04-09 | 1980-11-25 | Beloit Corporation | Method of and means for attaining uniformity in paper webs produced on a roll former |
US4515542A (en) * | 1983-07-05 | 1985-05-07 | Austria Tabkwerke Aktiengesellschaft vorm. Osterreischische Tabakregie | Apparatus for the production of a reconstituted tobacco foil |
US5409575A (en) * | 1991-07-19 | 1995-04-25 | Valmet-Tampella Inc. | Two-wire web-forming section of a paper machine |
-
1968
- 1968-02-19 US US706514A patent/US3578558A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3847731A (en) * | 1970-11-16 | 1974-11-12 | H Arledter | Twin wire paper making method in which controlled dewatering in tapering gap causes suspension to move at speed of wires |
US3972771A (en) * | 1974-02-28 | 1976-08-03 | The Black Clawson Company | Headbox with variable eddy decay length |
US4235667A (en) * | 1979-04-09 | 1980-11-25 | Beloit Corporation | Method of and means for attaining uniformity in paper webs produced on a roll former |
US4515542A (en) * | 1983-07-05 | 1985-05-07 | Austria Tabkwerke Aktiengesellschaft vorm. Osterreischische Tabakregie | Apparatus for the production of a reconstituted tobacco foil |
US5409575A (en) * | 1991-07-19 | 1995-04-25 | Valmet-Tampella Inc. | Two-wire web-forming section of a paper machine |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WALTER E. HELLER & COMPANY, INC., 101 PARK AVE., N Free format text: SECURITY INTEREST;ASSIGNOR:BLACK CLAWSON COMPANY, THE;REEL/FRAME:004250/0792 Effective date: 19840130 |
|
AS | Assignment |
Owner name: BLACK CLAWSON COMPANY THE Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:HELLER FINANCIAL, INC. F/K/A/ WALTER E. HELLER & COMPANY INC.;REEL/FRAME:004628/0875 Effective date: 19861015 |
|
AS | Assignment |
Owner name: CHEMICAL BANK, AS AGENT Free format text: SECURITY INTEREST;ASSIGNORS:BLACK CLAWSON COMPANY, THE, AN OH CORP.;HYDROTILE MACHINERY COMPANY, ANIOWA CORPORATION;REEL/FRAME:004930/0102 Effective date: 19880601 |