US3678846A - Roll press comprising two dissimilar rolls with equal deflection characteristics - Google Patents

Roll press comprising two dissimilar rolls with equal deflection characteristics Download PDF

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Publication number
US3678846A
US3678846A US16891A US3678846DA US3678846A US 3678846 A US3678846 A US 3678846A US 16891 A US16891 A US 16891A US 3678846D A US3678846D A US 3678846DA US 3678846 A US3678846 A US 3678846A
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Prior art keywords
roll
shell
center
rolls
wall thickness
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Expired - Lifetime
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US16891A
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English (en)
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Lars Gstaf Bjorkegren
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/02—Bearings
    • F16C13/022—Bearings supporting a hollow roll mantle rotating with respect to a yoke or axle
    • F16C13/024—Bearings supporting a hollow roll mantle rotating with respect to a yoke or axle adjustable for positioning, e.g. radial movable bearings for controlling the deflection along the length of the roll mantle
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/0026—Arrangements for maintaining uniform nip conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/05—Sleeved rolls with deflectable sleeves

Definitions

  • the invention relates to a roll press comprising two parallel rolls adapted for being pressed from opposite sides against a running web of eg paper and to provide a pressure evenly distributed over the length of the line of contact with the web.
  • the object of the present invention is to provide a roll press of a simple mechanical design, in which the uniform distribution of the pressure over the press nip is maintained in spite of variations of the total pressure. While previously suggested solutions usually have aimed at keeping the nip line as straight as possible and independent of the load, the present invention is based upon the principle of letting the rolls bend and making them equal in respect of resistance to deformation in all points along the nip, so that the rolls have an inherent tendency of assuming the same curvature when bent. With such a design of the rolls the pressure distribution over the nip will be independent of the total pressure.
  • a roll press of the above-mentioned kind in which a first roll has its ends united with bearing journals and the second roll consists of a tubular shell surrounding a through shaft having bearing journals at its ends, to which shaft said shell is connected merely at its center part, whereas the rest of shell is free of the shaft and distant therefrom, and in which press an important feature consists in that the wall thickness of one roll or both rolls varies along the length in such a manner that, starting from the center and progressing towards the ends, the quotient of the wall thickness of the second roll shell and the wall thickness of the first roll shell, both measured in the same transverse plane, first decreases and then becomes constant or increases.
  • the thickness of the end-supported roll shell is made uniform over the entire length used for pressing the web. Then the thickness of the center-supported roll shell will first decrease from the center towards the ends and then increase again at the shell ends.
  • the mathematical calculations of the truly correct shell thicknesses are simplified. Involved in these calculations is the knowledge that the total deformation is composed of the deformation caused by the bending of the roll shells as a beam, and of the deformation consisting of the depression of the shell at the nip, i.e. the deviation of the cross-section of the shell from the circular shape.
  • the calculations may be regarded as taking place in two steps, the first one being determination of the wall thickness of the centersupported roll shell in each cross-section with regard taken merely to bending moments and shearing stresses. This step results in a stuff distribution having a maximum thickness value at the center of the roll and gradually diminishing thicknesses towards the shell ends.
  • a second step of the calculations regard is taken also to the localized shell impression at the nip, which increases in the direction towards the shell ends and which must be compensated by a thickness increment.
  • said increment is added to the thickness obtained by the first calculation step, the result is a wall thickness which at a certain distance from the shell center stops decreasing and instead takes an approximately constant value or increases again; the latter usually being the case.
  • the shape of the curve representing the thickness of the shell will vary in dependence upon the length and diameters of the rolls, the elastic properties of the materials used, the permissible maximum pressure etc. Calculations carried out for a number of different roll presses of the sizes common in great modern paper making machines have given a collection of values form which certain rough rules or limits for the dimensioning can be found.
  • the minimum value of the above-mentioned shell thickness quotient, or of the shell thickness of the center-supported roll when the other roll shell is of uniform thickness appears at a point situated at a distance from the center of the rolls equal to 50 to 90 percent of the distance from the center to either shell end, in most cases equal to 60 to percent thereof. Under the same presumption, i.e.
  • the shell of the center-supported roll will at the above-mentioned point generally be of a minimum thickness amounting to 30 to 40 percent of the maximum thickness at the center of the roll shell, and the thickness of said shell at its end will usually lie between 50 and 65 percent of said maximum thickness.
  • FIG. 1 is an axial sectional view of the press
  • FIG. 2 is a diagram accurately showing the variation of the shell thickness.
  • the abscissae represent the distances from the transverse center plane, and the ordinates represent the corresponding thicknesses.
  • the press is shown as consisting of two parallel rotary rolls A and B.
  • the first roll A comprises a cast iron shell ll having outer and inner cylindrical faces, thus being of a uniform thickness over its entire length.
  • Disk-shaped end closures l3, 15 are attached to, preferably screwed into the shell ends, and bearing journals l7, 19 are integral with said end closures.
  • the second roll B likewise comprises a tubular shell 21 with a cylindrical outer face. Said shell is symmetrical about a transverse plane 23 extending through the center of the length of the shell.
  • the inner face is cylindrical and when following the shell from said cylindrical part 25 toward either shell end, thickness values will be encoun tered which first decrease and then increase again, a minimum value occuring at a point 29 distant from the end, and the thickness of the shell at the extreme end 27 taking a medium value.
  • the generatrix of the inner shell face forms a curve which on either side of the cylindrical shell part 25 is concave over its entire length and is continuously and smoothly bent without abrupt changes.
  • the point 29 of minimum wall thickness is situated at a distance from the center plane 23 equal to 75 percent of the total distance to the shell end 27.
  • the shell 21 is supported by a through steel shaft 3! having bearing journals 33, 35 at its ends.
  • the center part 37 of the shaft is cylindrical and connected to the cylindrical part 25 of the shell, preferably by a shrinkage fit.
  • the rest of the shell encloses the shaft at a distance thereto and without being supported thereby.
  • the shafi is tapered towards the ends so that the shell cannot contact the shaft at maximum deflection.
  • the journals l7, I9, 33, 35 are supported by bearings (not shown) by means of which, as indicated by the arrows, the rolls can be pressed against each other, or in operation against opposite sides of a paper web running between them. Moreover, at least one journal is connected to a driving means.
  • the press rolls are shown in the bent shape corresponding to the application of the maximum permissible pressure, which in this case has been assumed to amount to 100 kg per cm length of the nip.
  • the axis 41 of shaft 31 is bent in the opposite direction to the axis 43 of shell 21 and to the axis 39 of shell 11. Due to the shell impression at the nip, the line 45 of contact of the rolls shows a curvature slightly different from that of the axes 43, 39.
  • the pressure between the rolls, measured per unit of length is the same over the whole effective nip length as a result of the application of the invention, and this holds true also when the pressure is partly relieved and the roll shells are more and less straightened out.
  • a recess 47 is turned out of the shell, whereby the shrinkage fit upon the shaft is divided up into two zones lying on opposite sides of and distant from the center plane 23. According to the drawing, said zones extend to a distance from the center amounting to about It) to l percent of the total distance to the shell ends, but in other cases said figure can be raised up to about 25 percent at the most.
  • the shells of rolls A and B measure 5,200 mm in length and 875 and 785 mm, respectively, in diameter.
  • the shell I] of roll A has a uniform wall thickness of 67.5 mm, whereas the wall thickness of the shell 2! of roll B varies in the manner shown in the diagram FIG. 2, from a maximum value of 75 mm at the center to a minimum value of 24.5 mm at a distance of L950 mm from the center and then rises to a value of 45 mm at the end.
  • a roll press comprising two parallel rotary rolls adapted for being pressed against opposite sides of a running web, e. g. of paper, and for providing a pressure evenly distributed over the length of the line of contact with the web, the first one (A) of said rolls having its ends united with bearing journals, whereas the second roll (B) which consists of a tubular shell (2i) surrounds a through shaft (2i) having bearing journals at its ends and is connected to said shaft merely at a center part and for the rest is free and distant therefrom, the wall thickness of one roll or both rolls varying along the length in such a manner that, starting from the center and progressing towards the ends, the quotient of the wall thickness of the second roll shell (21) and the wall thickness of the first roll shell (11), measured in the same transyerse plane, first decreases and then becomes constant or increases; characterized in that said quotient stops decreasing at a distance from the center (23) of the rolls equal to 50 to 90 percent, preferably 60 to percent, of the distance from the center to either end.
  • a roll press comprising two parallel rotary rolls adapted for being pressed against opposite sides of a running web, e.g. of paper, and for providing a pressure evenly distributed over the length of the line of contact with the web, the first one (A) of said rolls having its ends united with bearing journals, whereas the second roll (B) which consists of a tubular shell (21) surrounds a through shaft (21) having bearing journals at its ends and is connected to said shaft merely at a center part and for the rest is free and distant therefrom, the wall thickness of one roll or both rolls varying along the length in such a manner that, starting from the center and progressing toward the ends, the quotient of the wall thickness of the second roll shell (21) and the wall thickness of the first roll shell (ll), measured in the same transverse plane, first decreases and then becomes constant or increases; characterized in that the shell (2]) of the second roll is connected with a shrinkage fit to the shaft (31) along two center zones situated symmetrically on opposite sides of the transverse center plane (23) and extending endward
  • a first roll comprising a hollow cylindrical shell of uniform wall thickness, means connected to either end of said shell for rotatably supporting the same, a second roll comprising a shaft rotatably supported at its ends and a hollow shell having a cylindrical outer face cooperating with the first-mew tioned shell to form a pressure nip extending along the lengths of the shells, a shrinkage connection between the center portions of said shaft and of said last-mentioned shell, the inner contour of said last-mentioned shell forming an inwardly concave curve extending from said center connection to either end and defining a shell wall thickness of a maximum value at the center and a minimum value at a point lying between the center and the end; characterized in that said minimum value is 30 to 40 percent of said maximum value and relates to a point of the roll situated at a distance from the center equal to 50 to percent of the distance from the center to the roll end.
  • a roll press comprising two parallel rotary rolls adapted for being pressed against opposite sides of a running web, e. g. of paper, and for providing a pressure evenly distributed over the length of the line of contact with the web, the first one (A) of said rolls having its ends united with bearing journals, whereas the second roll (B) which consists of a tubular shell (2

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US16891A 1969-03-07 1970-03-05 Roll press comprising two dissimilar rolls with equal deflection characteristics Expired - Lifetime US3678846A (en)

Applications Claiming Priority (1)

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SE3141/69A SE341660B (enrdf_load_html_response) 1969-03-07 1969-03-07

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US3678846A true US3678846A (en) 1972-07-25

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CA (1) CA924947A (enrdf_load_html_response)
DE (1) DE2010498A1 (enrdf_load_html_response)
FI (1) FI45777C (enrdf_load_html_response)
SE (1) SE341660B (enrdf_load_html_response)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884623A (en) * 1973-02-16 1975-05-20 Dyk Research Corp Van Xerographic fuser roller
US4116746A (en) * 1977-03-07 1978-09-26 Monarch Marking Systems, Inc. Hand-held labeler
US4727392A (en) * 1985-05-13 1988-02-23 The Mead Corporation Pressure development apparatus for imaging sheets employing photosensitive microcapsules
US4768050A (en) * 1987-04-16 1988-08-30 The Mead Corporation Pressure development apparatus for imaging sheets employing photosensitive microcapsules
US4768434A (en) * 1987-04-23 1988-09-06 The Mead Corporation Pressure development apparatus for imaging sheets
USRE34503E (en) * 1986-03-11 1994-01-11 Brother Kogyo Kabushiki Kaisha Imaging device
EP0671248A3 (en) * 1994-03-08 1996-03-20 New Castle Ind Inc Roller for processing even flat products.
US5711854A (en) * 1995-06-03 1998-01-27 Voith Sulzer Papiermaschinen Gmbh Dimensioning of rolls in wide nip roll press
US5728252A (en) * 1995-09-19 1998-03-17 Polaroid Corporation Method and apparatus for laminating image-bearing media
US6309512B1 (en) * 1998-09-22 2001-10-30 Valmet Karlstad Ab Device for impulse-pressing a web
US6935993B2 (en) * 2001-03-09 2005-08-30 Voith Paper Patent Gmbh Roll
US20080205867A1 (en) * 2004-05-29 2008-08-28 Thomas Gruber-Nadlinger Rotary part
US20080237386A1 (en) * 2007-03-30 2008-10-02 Wilhelm Aichele Rotary cutting device
US20090273133A1 (en) * 2008-04-30 2009-11-05 Sutton Donald C Roller
US20110098166A1 (en) * 2005-09-20 2011-04-28 Voith Patent Gmbh Expander roller
DE102010029431A1 (de) 2010-05-28 2011-12-01 Voith Patent Gmbh Mittengestützte Walze
DE102011086986A1 (de) 2011-11-23 2013-05-23 Voith Patent Gmbh Breitstreckwalze
US8967619B2 (en) * 2012-11-16 2015-03-03 Brother Kogyo Kabushiki Kaisha Image reading apparatus
EP2974857A1 (en) * 2014-07-15 2016-01-20 Paper Converting Machine Company Italia S.p.A. Embossing/laminating roller
US20170239832A1 (en) * 2016-02-24 2017-08-24 Nippon Tungsten Co., Ltd. Roll for rotary cutter and rotary cutter

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760616A (en) * 1971-10-21 1973-09-25 Speed O Print Business Mach Co Rollers
CA1270786A (en) * 1986-03-07 1990-06-26 Akechi Yano Roll with an arched shaft
FI96334C (fi) * 1993-11-24 1996-06-10 Valmet Paper Machinery Inc Menetelmä paperin tai vastaavan rainamateriaalin kalanteroinnissa ja menetelmää soveltava kalanteri
DE19640966B4 (de) * 1996-10-04 2004-09-23 Skf Gmbh Zylinder zum Drucken, insbesondere in der Papier- und Textilindustrie
DE19729907A1 (de) * 1997-07-12 1999-01-14 Voith Sulzer Papiermasch Gmbh Walze
DE20103034U1 (de) * 2001-02-20 2002-07-04 Eduard Küsters Maschinenfabrik GmbH & Co. KG, 47805 Krefeld Kalander

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US41851A (en) * 1864-03-08 Improvement in rolls
US242058A (en) * 1881-05-24 sohtjrmann
US3161125A (en) * 1961-02-15 1964-12-15 Beloit Iron Works Adjustable crown roll

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US41851A (en) * 1864-03-08 Improvement in rolls
US242058A (en) * 1881-05-24 sohtjrmann
US3161125A (en) * 1961-02-15 1964-12-15 Beloit Iron Works Adjustable crown roll

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884623A (en) * 1973-02-16 1975-05-20 Dyk Research Corp Van Xerographic fuser roller
US4116746A (en) * 1977-03-07 1978-09-26 Monarch Marking Systems, Inc. Hand-held labeler
US4727392A (en) * 1985-05-13 1988-02-23 The Mead Corporation Pressure development apparatus for imaging sheets employing photosensitive microcapsules
USRE34503E (en) * 1986-03-11 1994-01-11 Brother Kogyo Kabushiki Kaisha Imaging device
US4768050A (en) * 1987-04-16 1988-08-30 The Mead Corporation Pressure development apparatus for imaging sheets employing photosensitive microcapsules
EP0287404A3 (en) * 1987-04-16 1990-04-25 The Mead Corporation Pressure developer
US4768434A (en) * 1987-04-23 1988-09-06 The Mead Corporation Pressure development apparatus for imaging sheets
EP0671248A3 (en) * 1994-03-08 1996-03-20 New Castle Ind Inc Roller for processing even flat products.
US5567448A (en) * 1994-03-08 1996-10-22 New Castle Industries, Inc. Roll for processing uniformly flat products
US5711854A (en) * 1995-06-03 1998-01-27 Voith Sulzer Papiermaschinen Gmbh Dimensioning of rolls in wide nip roll press
US5728252A (en) * 1995-09-19 1998-03-17 Polaroid Corporation Method and apparatus for laminating image-bearing media
US6309512B1 (en) * 1998-09-22 2001-10-30 Valmet Karlstad Ab Device for impulse-pressing a web
US6935993B2 (en) * 2001-03-09 2005-08-30 Voith Paper Patent Gmbh Roll
US20080205867A1 (en) * 2004-05-29 2008-08-28 Thomas Gruber-Nadlinger Rotary part
US7789818B2 (en) * 2004-05-29 2010-09-07 Voith Patent Gmbh Rotary part
US20110098166A1 (en) * 2005-09-20 2011-04-28 Voith Patent Gmbh Expander roller
US20080237386A1 (en) * 2007-03-30 2008-10-02 Wilhelm Aichele Rotary cutting device
US20090273133A1 (en) * 2008-04-30 2009-11-05 Sutton Donald C Roller
US8206277B2 (en) * 2008-04-30 2012-06-26 Hewlett-Packard Development Company, L.P. Idler roller assembly having a roller and a shaft the roller being formed such that it remains parallel to contacted media despite deflection of the shaft
WO2011147870A1 (de) 2010-05-28 2011-12-01 Voith Patent Gmbh Mittengestützte walze
DE102010029431A1 (de) 2010-05-28 2011-12-01 Voith Patent Gmbh Mittengestützte Walze
DE102011086986A1 (de) 2011-11-23 2013-05-23 Voith Patent Gmbh Breitstreckwalze
US8967619B2 (en) * 2012-11-16 2015-03-03 Brother Kogyo Kabushiki Kaisha Image reading apparatus
EP2974857A1 (en) * 2014-07-15 2016-01-20 Paper Converting Machine Company Italia S.p.A. Embossing/laminating roller
US20170239832A1 (en) * 2016-02-24 2017-08-24 Nippon Tungsten Co., Ltd. Roll for rotary cutter and rotary cutter
US10391663B2 (en) * 2016-02-24 2019-08-27 Nippon Tungsten Co., Ltd. Roll for rotary cutter and rotary cutter

Also Published As

Publication number Publication date
DE2010498A1 (de) 1970-09-24
CA924947A (en) 1973-04-24
FI45777C (fi) 1972-09-11
FI45777B (enrdf_load_html_response) 1972-05-31
SE341660B (enrdf_load_html_response) 1972-01-10

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