US3565759A - Paper machine press - Google Patents

Paper machine press Download PDF

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Publication number
US3565759A
US3565759A US735821A US3565759DA US3565759A US 3565759 A US3565759 A US 3565759A US 735821 A US735821 A US 735821A US 3565759D A US3565759D A US 3565759DA US 3565759 A US3565759 A US 3565759A
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US
United States
Prior art keywords
press roll
felt
press
nip
roll
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
US735821A
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English (en)
Inventor
Willard C Notbohm
Walter E Rojecki
Paul M Schaffrath
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.)
Black Clawson Co
Original Assignee
Black Clawson Co
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 Black Clawson Co filed Critical Black Clawson Co
Application granted granted Critical
Publication of US3565759A publication Critical patent/US3565759A/en
Assigned to WALTER E. HELLER & COMPANY, INC. reassignment WALTER E. HELLER & COMPANY, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLACK CLAWSON COMPANY, THE
Assigned to BLACK CLAWSON COMPANY, THE reassignment BLACK CLAWSON COMPANY, THE RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: HELLER FINANCIAL, INC. F/K/A/ WALTER E. HELLER & COMPANY INC.
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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/06—Means for regulating the pressure
    • 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
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof

Definitions

  • a press section has a driven suction press roll and a small diameter press roll located within an endless felt, and each press roll forms a nip with the same third press roll located outside the felt.
  • the small diameter press roll is rotatably supported within a cradle formed by a plurality of backup rollers which are movable to retract the press roll to a position where it is driven solely by the felt and permits threading of a paper web without damaging the felt.
  • One method of reducing the above problem of cutting or marking the felt is to incorporate a high speed kicker roll ahead of the high intensity nip and adjacent the web so that any wads and lumps are kicked off the felt and the leading end of the web before it enters the press nip.
  • a high speed kicker roll ahead of the high intensity nip and adjacent the web so that any wads and lumps are kicked off the felt and the leading end of the web before it enters the press nip.
  • Such a roll doesnot solve the problem of blowing caused by the entrapment of air between the web and felt.
  • a suction press roll is positioned within an endless felt and forms a nip with a second press roll located outside the felt.
  • a third press roll having a diameter substantially smaller than the diameters of the first and second press rolls is also located within the felt and forms a second nip with the second press roll.
  • the small diameter press roll is supported for movement into and out of nip-forming relation with the suction roll.
  • the small diameter or third press roll can be pressure loaded to form a high intensity nip with the second press roll, but while in its retracted position, the third press roll is driven at web speed by the felt so that when the high intensity nip is formed, there is no inertia shock produced by the third press roll on the felt to cause marking or cutting of the felt.
  • FIG. 1 is a fragmentary elevational view of a paper machine press constructed in accordance with the invention
  • FIG. 2 is a view taken generally along the line 2-2 of FIG. 1 with the center portion broken away;
  • FIG. 3 is an enlarged fragmentary section taken generally on the line 33 of FIG. 2;
  • FIG. 4 is a section taken generally on the line 4-4 of FIG. 1 with the center portion of the press broken away;
  • FIG. 5 is an enlarged fragmentary and somewhat schematic section taken generally on the line 5-5 of FIG. 4.
  • the frame includes a pair of parallel spaced base members 12 each supporting a bearing 13.
  • a suction press roll 15 has journals supported by the bearings 13 and includes the usual cylindrical shell 16 (FIG. 5) having multiple perforations 18, and which also may have a rubber cover (not shown).
  • a suction box 20 is located within the upper portion of the press roll 15 and is connected to a suction line (not shown) which enters the press roll through one of its journals.
  • the machine drive 22 (FIG. 1) is connected to the other journal for driving the roll 15, and a semi-cylindrical saveall pan 23 extends between the bearings 13 around the lower portion of the suction press roll 15.
  • the frame 10 also includes parallel spaced side members 24 which are rigidly secured to the base member 12.
  • a pair of parallel spaced arms 25 are positioned between the frame members 24 and are rigidly connected by a laterally extending plate 26 and a shaft 27 which is rotatably supported by aligned bearings 28 mounted on the frame members 24.
  • An upper or second press roll 30 has journals which are supported by bearings 32 located within U-shaped end portions 33 of the arms 25 and secured by screws 34.
  • the press roll 30 has a hard smooth outer surface 35 which is continuously cleaned by a blade 38 of a doctor assembly 40 including a blade support frame 41 mounted on a shaft 42 pivotally supported by bearing blocks 43 mounted on the plate 26 connecting the arms 25.
  • the doctor blade 38 is retracted from the surface 35 by actuation of a lift cylinder 45 which is mounted on one of the bearings 32 and has a plunger 46 adapted to engage a pivot arm 47 connected to the shaft 42.
  • a pair of cylinders 50 are pivotally mounted on the base members 12 of the frame 10 by pins 51 and have piston rods 52 pivotally connected to the arms 25 by pins 53.
  • the press roll 30 is moved into pressure engagement with the suction press roll 15 to form a nip N; at approximately a five oclock position on the roll 30.
  • a helper drive 55 may be connected to one of the journals of the press roll 30 through a shaft 56 (FIG. 4) although in most installations, the press roll 30 can be driven solely through the nip N by the suction press roll and its drive 22.
  • a press roll 60 (FIG. 1) forms a second nip N with the press roll at approximately a seven oclock position and has an outer diameter substantially smaller than the diameters of the press rolls 15 and 30 for obtaining a high intensity pressure within the nip N
  • the press roll includes journals 61 and may be a solid or tubular roll, preferably formed of stainless steel.
  • the small press roll 60 is also preferably provided with a suitably grooved surface as described and for the same reasons pointed out in the above patent. For some installations, however, particularly at such locations on the paper machine where the water content of the web has been substantially reduced, it may be found satisfactory to utilize a smooth surfaced small roll 60.
  • the roll 60 is also possible to form the roll 60 as a metal core with a cover of resilient or elastomeric material.
  • a cooling medium such as water
  • the press roll 60 is supported by a cradle assembly which includes a cross beam 72 (FIGS. 1 and 4) having a top flange 73 (FIG. 3) and reinforcing side plates 74.
  • Brackets 76 (FIG. 4) are rigidly secured to the ends of the beam 72 and are releasably attached to bosses 77 on the U-shaped portions 33 of the arms 25 by a series of eye-bolts 78.
  • the bolts 78 are pivotally connected to the bosses 77 and extend through corresponding slots '79 formed with the brackets 76.
  • the cradle assembly 70 further includes a series of rollers (FIGS. 2 and 5) which are arranged in an alternately staggered manner in two rows to define a nest or cradle for the press roll 60.
  • rollers 85 For a detailed description of the specific construction of the rollers 85, reference is made to copending application Ser. No. 623,732, filed Mar. 16, 1967, now abandoned, and assigned to the assignee of the present invention.
  • Each roller 85 is mounted on a shaft 87 (FIG. 5) which is supported within aligned V-shaped notches 88 formed within upwardly projecting ears 89 of a bracket 90, and screws 91 secure each shaft 87 to its supporting ears 89.
  • Each bracket is pivotally mounted on a shaft 92 which is supported by ears (not shown) projecting upwardly from a flat plate 93 secured to the top flange 13 of the cross beam 72.
  • An elongated resilient air spring or air bag is positioned between each row of support brackets 90 and the plate 92 so that by controlling the air pressure within the air bags 100, the brackets 90 are pivoted with uniform pressure to move the press roll 60 between a retracted position as shown in FIG. 5 and a position forming a high intensity nip N as shown in FIG. 1. While the high intensity press roll 60 is primarily supported by the rollers 85, each journal 61 of the press roll 60 is received within an anti-friction bearing 102 (FIGS. 1 and 3) which is guided for floating movement in a radial direction by parallel spaced retaining bolts 103 projecting upwardly from a housing 105 mounted on the plate 92. A bar 106 and nuts 107 rigidly connect the upper ends of the bolts 103.
  • An endless felt F is directed through the nips N and N and extends downwardly around a series of felt guide rolls 110 (FIG. 1) so that the suction press roll 15 and the small diameter press roll 60 are located within the felt F and the press roll 30 is located outside or above the felt.
  • the press roll 60 is wrapped a few degrees by the felt F which is provided with a Controlled tension by biasing one of the felt guide rolls 110 with suitable air cylinders (not shown).
  • a pair of adjustable legs 112 are provided on each end of the beam 72 so that when it is desired to replace the felt F, the cradle assembly 70 is elevated by pivoting the arms 25, and spacer blocks 113 are positioned on the frame 10 under the legs 112. The cradle assembly 70 is lowered so that the legs rest upon the blocks 113, after which the eye-bolts 78 are released and swung upwardly to disconnect the cradle assembly 70 from the support arms 25.
  • the top press roll 30 is then elevated to allow the felt F to be conveniently inserted into both of the nips N and N
  • the pressure within the air bags 100 is reduced so that press roll 60 is moved to a retracted position, thereby opening nip N
  • the leading end of the paper web W is carried by the felt F through the first closed suction nip N and then through open nip N
  • the pressure within the air bags 100 is increased to move press roll 60 into pressure engagement with the top press roll 30 and thereby to form the second nip N of high intensity pressure.
  • a paper machine press constructed in accordance with the invention provides several desirable features and advantages. For example, by arranging both the suction roll 15 and small diameter press roll 60 within the endless felt F, and by supporting the press roll 60 so that it can be retracted to open the high intensity nip N the web W can be easily threaded through the press without any danger of marking the felt or blowing the web. That is, when the tail or leading end of a newly formed paper web W is picked up by the felt F, it is first carried through the wide suction nip N where any lumps or wads are crushed and the air carried into the nip by roll 30 is removed by the suction press roll 15 to prevent blowing of the web.
  • the press roll 60 is elevated to form the high intensity nip N Moreover, there is no danger of marking or cutting the felt by inertia shock from the press roll 60 since this roll has low mass and is continuously driven while in its retracted position by the felt F so that the roll has a surface speed substantially the same as the felt F.
  • the support of the top press roll 30 and the cradle assembly 70 for the high intensity press roll 60 also provide an important feature of the invention. That is, with both the top press roll 30 and the cradle assembly 70 mounted on the pivotable arms 25, the endless felt F may be conveniently replaced simply by lowering the cradle assembly 70 onto the blocks 113 and disconnecting the cradle assembly by releasing the swing bolt 78. This permits the top press roll 30 to be raised above both the suction press roll 15 and the press roll 60 resting on the cradle assembly 70.
  • a paper machine press for use in combination with an endless felt for dewatering a paper web carried by the felt, comprising a first press roll positioned within the felt, a second press roll positioned outside the felt and forming a first nip with said first press roll, a third press roll positioned within the felt and having a diameter substantially smaller than the diameters of said first and second press rolls, means supporting said third press roll for movement between a position forming a second nip with said second press roll and a retracted position spaced from said second press roll, means for directing the felt through said first and second nips and partially around said third press roll, and means for driving at least one of said first and second press rolls causing the felt to carry the web successively through said first and second nips as well as to drive said third roll in said retracted position thereof.
  • a press as defined in claim 1 wherein said third press roll comprises a cylindrical metal core, and a resilient layer surrounding said core.
  • said means supporting said third press roll include a plurality of rollers arranged in two rows to define a cradle for receiving said third press roll, a movable bracket for supporting each said roller, and fluid pressure means for moving each said bracket to provide a controlled uniform pressure within said second nip.
  • a press as defined in claim 1 including a pair of arms supporting said second press roll, pivot means supporting said arms, pressure cylinder means connected to said arms for moving said second press roll relative to said first press roll, and means for connecting said supporting means for said third press roll to said arms to provide for movement of said third press roll with said second press roll.
  • said means supporting said third press roll include a plurality of rollers arranged to define a cradle for receiving said third press roll, fluid actuated means for supporting said rollers, said third press roll having journals at the ends thereof, a bearing mounted on each said journal, and means retaining each said bearing for floating movement.
  • a paper machine press for use in combination with an endless felt supporting a paper web on the outer surface thereof, comprising a first press roll positioned within the felt, a second press roll positioned outside the felt, means for urging said rolls into pressure engagement defining a first nip having an entry side and an exit side for the felt, a third press roll positioned within the felt in spaced relation with the exit side of said nip, said third press roll being of relatively small diameter in comparison with the diameters of said first and second press rolls, means supporting said third press roll for movement in a predetermined range between a position forming a second nip with said second press roll and a retracted position spaced out of engagement with said second press roll, means maintaining the felt in sufiicient tension to drive said third press roll in all positions of said third press roll within said range of movement thereof, and means for driving said first press roll to drive said second press roll and the felt through pressure engagement therewith.
  • a paper machine press for use in combination with an endless felt for dewatering a paper web carried by said felt, comprising a first press roll positioned outside the felt, a second press roll positioned within the felt and having a diameter substantially smaller than the diameter of said first press roll, means supporting said first press roll for displacement to a position spaced from said second press roll, means including a plurality of rollers arranged to define a cradle for rotatably supporting said second press roll, means connecting said supporting means for said second press roll to said supporting means for said first press roll to cause displacement of said second press roll with said first press roll, means for moving said rollers relative to said first press roll to move said second press roll between a position forming a nip with said first press roll and a retracted position spaced from said first press roll, means for directing said endless felt through said nip and partially around said second press roll and means for driving said first press roll and said felt to effect driving of said second press roll in said retracted posi tion by said felt.
  • said means supporting said second press roll further include a bracket for each said roller, pivot means disposed substantially within a plane defined by the axes of said first and second press rolls for supporting each said bracket, and fluid actuated means for pivoting said brackets to move said second press roll between said nip and retracted positions.
  • a press as defined in claim 10 wherein said fluid actuated means comprise at least one elongated air bag positioned adjacent a plurality of said brackets.
  • a paper machine press for use in combination with an endless felt for dewatering a paper web carried by the felt, comprising a first press roll positioned within the felt, a second press roll positioned outside the felt and forming a first nip with said first press roll, a third press roll posi tioned within the felt and having a diameter substantially smaller than the diameters of said first and second press rolls, means including a plurality of rollers arranged to define a cradle for rotatably supporting said third press roll, fluid pressure means for supporting said rollers in position to form a second nip between said third press roll and said second press roll, means for directing the felt through said first and second nips, and means for driving at least one of said first and second press rolls causing the felt to carry the web successively through said first and second nips.
  • a paper machine press for use in combination with a looped endless felt for dewatering a paper web carried by the felt, comprising a suction rol'l positioned within the loped felt, a press roll positioned outside the felt and forming a first nip with said suction roll, means positioned within the felt and having a curved surface forming a second nip with said press roll, said surface having a radius of curvature substantially smaller than the radius of curvature of the outer surface of each of said rolls, means for directing the felt through said first and second nips, and means for driving at least one of said rolls to cause the felt to carry the web successively through said first and second nips.
  • a press as defined in claim 13 including fluid pressure means for moving said curved surface between a retracted position and a position forming said second nip.

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  • Paper (AREA)
  • Advancing Webs (AREA)
US735821A 1968-06-10 1968-06-10 Paper machine press Expired - Lifetime US3565759A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73582168A 1968-06-10 1968-06-10

Publications (1)

Publication Number Publication Date
US3565759A true US3565759A (en) 1971-02-23

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ID=24957321

Family Applications (1)

Application Number Title Priority Date Filing Date
US735821A Expired - Lifetime US3565759A (en) 1968-06-10 1968-06-10 Paper machine press

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US (1) US3565759A (enrdf_load_stackoverflow)
BR (1) BR6909608D0 (enrdf_load_stackoverflow)
DE (1) DE1928304A1 (enrdf_load_stackoverflow)
FR (1) FR2010617A1 (enrdf_load_stackoverflow)
GB (1) GB1234113A (enrdf_load_stackoverflow)

Cited By (3)

* 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
US4935098A (en) * 1987-09-15 1990-06-19 Oy Tampella Ab Press section in a paper machine with guide track support for central roll
US5984847A (en) * 1994-08-16 1999-11-16 Beloit Technologies, Inc. Self loading controlled deflection roll

Cited By (3)

* 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
US4935098A (en) * 1987-09-15 1990-06-19 Oy Tampella Ab Press section in a paper machine with guide track support for central roll
US5984847A (en) * 1994-08-16 1999-11-16 Beloit Technologies, Inc. Self loading controlled deflection roll

Also Published As

Publication number Publication date
BR6909608D0 (pt) 1973-01-09
GB1234113A (enrdf_load_stackoverflow) 1971-06-03
DE1928304A1 (de) 1969-12-11
FR2010617A1 (enrdf_load_stackoverflow) 1970-02-20

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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