US3852860A - Bending compensated roll for a calender - Google Patents

Bending compensated roll for a calender Download PDF

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Publication number
US3852860A
US3852860A US00408302A US40830273A US3852860A US 3852860 A US3852860 A US 3852860A US 00408302 A US00408302 A US 00408302A US 40830273 A US40830273 A US 40830273A US 3852860 A US3852860 A US 3852860A
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US
United States
Prior art keywords
roll
core
bending
shell
calender
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
US00408302A
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English (en)
Inventor
J Tewes
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.)
KraussMaffei Extrusion GmbH
Original Assignee
Hermann Berstorff Maschinenbau GmbH
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 Hermann Berstorff Maschinenbau GmbH filed Critical Hermann Berstorff Maschinenbau GmbH
Application granted granted Critical
Publication of US3852860A publication Critical patent/US3852860A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length

Definitions

  • the invention relates to a roll for rolling out plastics material to form a web of sheeting in a calender or roll mill.
  • the rolls bend when material passes between them, so that the gap between the rolls is wider in the middle than at the two ends. If the material has a high resistance to deformation and if the diameter of the rolls is small relative to their length, then there is a large amountof bending or vice versa. Some bending, however, always takes place and is a great disadvantage in all working processes.
  • the invention has among its objects to provide a calendering roll, the surface of which, in the region of a bending load applied by material in the gap between the rolls of a calender, is a straight line from one end of the roll to the other at any bending load.
  • a roll for rolling out plastics material to form a web of sheeting in a calender or roll mill wherein the roll comprises a core, a shell and resilient means interposed between the core and the sheet at regular intervals around the core, the resilient means compensating for bending of the roll caused by material being rolled, permitting linear supporting of the shell on the roll core, and having a spring force which increases from the ends towards the middle of the roll commensurately with the bending characteristic of the core.
  • the resilient means are pieces of resilient metal tubes arranged at regular intervals between the core and the shell and the spring forces thereof are adapted to compensate for the bending of the core produced by the bending force in the gap between theroll and a cooperating further roll, by means of a progressive reduction in the internal diameters of said pieces of resilient metal tubes from both ends of the roll towards the middle of the roll, and a constant external diameter.
  • This measure provides an advantageous solution to the problem underlying the invention, since it ensures that, when the core of the roll is bent by the pressure of material in the gap between the rolls, the resilient means between the shell and the core will yield more at the ends of the roll than in the middle of the roll, thereby compensating for the bending of the core, which is less at the ends of the roll than in the middle.
  • the sheeting will show no variation in thickness, or only extremely slight variation, if the opposed roll also undergoes no appreciable bending. This may be taken to be the case, since the opposed roll of a calender has a stretching load applied to it from two sides.
  • the spring force of the resilient means between the core and the shell would be in a specific ratio to the bending of the core: The greater the bending of the core towards the middle of the roll, the greater must be the spring force of the resilient means between the core and the shell, towards the middle of the roll.
  • the compression characteristic (a measure of the stiffness of the spring) is understood as being a value equal to the force acting on the spring, divided by the extent of compression of the spring, i.e., C F/S, where C represents the spring force, F the force acting on the spring and S the distance by which the spring is compressed.
  • the shell virtually ensures that, on any bending of the core, the shell will form a straight line in the region of a bending load, in the gap between the rolls, since withsuch relatively slight bending there will be a proportional relationship between the bending of the core and the spring force. It should be emphasised particularly that the invention permits linear supporting of the shell on the core; this contributes much towards forming the straight line described by the shell from one end of the roll to the other in the region of the bending load, i.e. in the gap between the rolls of the calender.
  • FIG. 1 is a cross-section through a roll according to the invention
  • FIG. 2 is a plan view of part of the roll of FIG. 1 but without its shell;
  • FIG. 3 is a section taken on line IIIIII of FIG. 1;
  • FIG. 4 is a diagrammatic representation of the bending of the core and of the shell of the roll of FIG. 1;
  • FIG. 5 is again a diagrammatic representation of the bending of the roll of FIG. 1, but under a greater stretching load.
  • a roll has an outer shell 1 and a core 2.
  • the shell 1 is spaced from the core 2-and supported over its whole length on the core 2 by pieces of tubing 3, 3a and 3b and pieces of steel rod 4.
  • the pieces of tubing 3, 3a and 3b have different wall thicknesses, the pieces 3b with thinnest walls being provided at the ends of the roll, the pieces 3a with thicker walls nearer the middle and the pieces 3 with thickest walls nearest the middle.
  • Right in the middle are the pieces of steel rod 4.
  • the pieces of tubing 3, 3a and 3b and the pieces of rod 4 all have the same external diameter.
  • the pieces of rod 4 and tubing 3, 3a and 3b are put together or soldered in such a way that the walls of the tubing 3b become successively thinner and thinner towards the ends.
  • the resultant tubes 3 are sealed at the ends by hemispherical caps 5a.
  • FIG. 3 shows how the pieces of tubing 3 lie on the core 2 in shallow grooves 30, equally spaced over the whole periphery.
  • References 9 to 15 indicate the circuit of a heating medium, which circulates in the direction indicated by arrows.
  • the heating medium enters at 9 through ence 21 the extent 22 of compression of the spring must be equal to the deflection 21 of the core 2.
  • the sealing of the roll to prevent the heating medium from leaking out is provided by seals 5, metal bellows 6 and stops 7, which allow relative axial movement of the core 2 and the shell 1 and only slightly inhibit radial movement between them.
  • the shell 1 is secured against relative rotation with respect to the core 2 by means of adjusting springs 8, which also allow axial movement between the core 2 and the shell 1.
  • FIG. 4 shows how the resilient pieces of tubing 3, 3a and 3b represented as coil springs are compressed when loaded, causing them to act as springs.
  • relatively weak springs 31) are provided at the ends, progressively stronger springs 3a are provided towards the middle and strongest springs 3 are provided immediately adjacent the middle.
  • the pieces of rod 4 are presented by a non-resilient block 4.
  • a datum line 19 is plotted at the points of maximum bending at the middle of the roll, and from this line the differences in bending are measured.
  • the core 2 When a bending load 17a is applied to the roll, the core 2 is flexed along a bending line 16.
  • the spring forces selected for the individual pieces of tubing must enable them to be compressed just enough to causethe shell 1 in the region of the bending load to lie at every point no higher and no lower than in the centre. This means that at the place where there is a bending differ- At the location of a deflection 23 of the core 2 the extent 24 of compression of the springs must be equal to that deflection.
  • FIG. 5 shows that both the deflections 26 and 28 under a bending load 17b and the extent 25 and 27 of spring compression are proprotionally greater than with the bending load 17a in FIG. 4. This means that the extent 25 of spring compression is again equal to the deflection 26 of the core 2, and the extent 27 of spring compression is equal to the deflection 28 of the core 2.
  • FIGS. 4 and 5 thus indicate diagrammatically that the shell-'1 undergoes no bending in the region of the bending load, independently of the size of the load 17a and 17b and of the bending of the core 2. It will particularly be noted from these Figures that the compression characteristics of the springs of the resilient means between the core and the shell must be kept in a specific ratio to the bending of the core.
  • a roll for rolling out plastics material to form a web of sheeting in a calender said roll comprising a core, an outer shell surrounding said core and spaced relative thereto, and resilient means interposed between said core and said shell at regular intervals around said core, said resilient means comprising pieces of resilient metal tubes longitudinally arranged and abutting in rows at regular intervals around said core, the internal diameter of the tubesin each row. decreasing from the ends of said rolls toward the center of said roll, said metal tubes having a constant external diameter so as to provide linear support of said shell on said core, said rows of tubes thereby providing a spring force which increases from the ends toward the middle of said row commensurately with the bending characteristics of said core.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US00408302A 1972-10-21 1973-10-23 Bending compensated roll for a calender Expired - Lifetime US3852860A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2251763A DE2251763C3 (de) 1972-10-21 1972-10-21 Walze mit Durchbiegungsausgleich zum Auswalzen von plastischen Werkstoffen zu Folienbahnen auf einem Kalander oder Walzwerk

Publications (1)

Publication Number Publication Date
US3852860A true US3852860A (en) 1974-12-10

Family

ID=5859723

Family Applications (1)

Application Number Title Priority Date Filing Date
US00408302A Expired - Lifetime US3852860A (en) 1972-10-21 1973-10-23 Bending compensated roll for a calender

Country Status (7)

Country Link
US (1) US3852860A (sv)
JP (1) JPS4974748A (sv)
BE (1) BE805675A (sv)
DE (1) DE2251763C3 (sv)
FR (1) FR2203701B3 (sv)
GB (1) GB1422814A (sv)
IT (1) IT994464B (sv)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071081A (en) * 1975-06-17 1978-01-31 Fives-Cail Babcock Internally cooled roller
US4158128A (en) * 1977-06-20 1979-06-12 Ivanovsky Nauchno-Issledo-Valetelsky Experimentalnokonstruktorsky Mashinostroitelny Institut Roller for applying uniform load across the width of processed sheet material
US4471515A (en) * 1980-06-27 1984-09-18 Mitsubishi Jukogyo Kabushiki Kaisha Rolls for single facer
US4658486A (en) * 1984-04-06 1987-04-21 Walzen Irle Gmbh Fluid-medium-heated calender roll
US5368680A (en) * 1992-08-06 1994-11-29 Leonard Kurz Gmbh & Co. Apparatus for applying a stamping foil imprint to a web of flexible material
US5567448A (en) * 1994-03-08 1996-10-22 New Castle Industries, Inc. Roll for processing uniformly flat products
US5984846A (en) * 1994-06-06 1999-11-16 Buhler Ag Roller
US6453713B1 (en) 2001-04-06 2002-09-24 New Castle Industries, Inc. Deflection dampening apparatus for a roll used to process uniformly flat products
US20050003939A1 (en) * 2003-07-02 2005-01-06 New Castle Industries, Inc. Roll having multiple fluid flow channels for use in producing and processing sheet material
US20060101974A1 (en) * 2004-11-03 2006-05-18 Sandvik Intellectual Property Ab Anvil for a rotary cutting unit and a rotary cutting unit having an anvil
US20140205826A1 (en) * 2011-07-07 2014-07-24 Dsm Ip Assets B.V. Process for making a polymeric film

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
HUT73837A (en) * 1994-06-06 1996-09-30 Buehler Ag Roller
DE19654199A1 (de) * 1996-12-23 1998-07-02 Voith Sulzer Papiermasch Gmbh Walze für eine Maschine zur Herstellung einer Faserstoffbahn

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US242058A (en) * 1881-05-24 sohtjrmann
US2187250A (en) * 1936-10-16 1940-01-16 American Rolling Mill Co Method of compensating for roll deflection
US3522643A (en) * 1967-09-15 1970-08-04 Bethlehem Steel Corp Resilient table roller
US3750246A (en) * 1971-09-13 1973-08-07 Gulf & Western Syst Co Composite roll

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US242058A (en) * 1881-05-24 sohtjrmann
US2187250A (en) * 1936-10-16 1940-01-16 American Rolling Mill Co Method of compensating for roll deflection
US3522643A (en) * 1967-09-15 1970-08-04 Bethlehem Steel Corp Resilient table roller
US3750246A (en) * 1971-09-13 1973-08-07 Gulf & Western Syst Co Composite roll

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071081A (en) * 1975-06-17 1978-01-31 Fives-Cail Babcock Internally cooled roller
US4158128A (en) * 1977-06-20 1979-06-12 Ivanovsky Nauchno-Issledo-Valetelsky Experimentalnokonstruktorsky Mashinostroitelny Institut Roller for applying uniform load across the width of processed sheet material
US4471515A (en) * 1980-06-27 1984-09-18 Mitsubishi Jukogyo Kabushiki Kaisha Rolls for single facer
US4658486A (en) * 1984-04-06 1987-04-21 Walzen Irle Gmbh Fluid-medium-heated calender roll
US5368680A (en) * 1992-08-06 1994-11-29 Leonard Kurz Gmbh & Co. Apparatus for applying a stamping foil imprint to a web of flexible material
US5567448A (en) * 1994-03-08 1996-10-22 New Castle Industries, Inc. Roll for processing uniformly flat products
US5984846A (en) * 1994-06-06 1999-11-16 Buhler Ag Roller
US6453713B1 (en) 2001-04-06 2002-09-24 New Castle Industries, Inc. Deflection dampening apparatus for a roll used to process uniformly flat products
US20050003939A1 (en) * 2003-07-02 2005-01-06 New Castle Industries, Inc. Roll having multiple fluid flow channels for use in producing and processing sheet material
US6942606B2 (en) 2003-07-02 2005-09-13 New Castle Industries, Inc. Roll having multiple fluid flow channels for use in producing and processing sheet material
US20060101974A1 (en) * 2004-11-03 2006-05-18 Sandvik Intellectual Property Ab Anvil for a rotary cutting unit and a rotary cutting unit having an anvil
KR101164469B1 (ko) 2004-11-03 2012-07-18 산드빅 인터렉츄얼 프로퍼티 에이비 회전 절삭 유닛용 앤빌 및 앤빌을 구비한 회전 절삭 유닛
US8336435B2 (en) * 2004-11-03 2012-12-25 Sandvik Intellectual Property Ab Anvil for a rotary cutting unit and a rotary cutting unit having an anvil
US20140205826A1 (en) * 2011-07-07 2014-07-24 Dsm Ip Assets B.V. Process for making a polymeric film
US10384408B2 (en) * 2011-07-07 2019-08-20 Dsm Ip Assets B.V. Process for making a polymeric film

Also Published As

Publication number Publication date
BE805675A (fr) 1974-02-01
JPS4974748A (sv) 1974-07-18
DE2251763B2 (sv) 1974-10-17
IT994464B (it) 1975-10-20
GB1422814A (en) 1976-01-28
FR2203701B3 (sv) 1976-09-17
DE2251763C3 (de) 1975-06-05
FR2203701A1 (sv) 1974-05-17
DE2251763A1 (de) 1974-05-02

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