EP0319897A1 - Frame of a supercalender - Google Patents

Frame of a supercalender Download PDF

Info

Publication number
EP0319897A1
EP0319897A1 EP19880120303 EP88120303A EP0319897A1 EP 0319897 A1 EP0319897 A1 EP 0319897A1 EP 19880120303 EP19880120303 EP 19880120303 EP 88120303 A EP88120303 A EP 88120303A EP 0319897 A1 EP0319897 A1 EP 0319897A1
Authority
EP
European Patent Office
Prior art keywords
frame
supercalender
diagonal
vertical
horizontal
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.)
Withdrawn
Application number
EP19880120303
Other languages
German (de)
English (en)
French (fr)
Inventor
Pentti Heijola
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.)
Valmet Technologies Oy
Original Assignee
Valmet Paper Machinery Inc
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 Valmet Paper Machinery Inc filed Critical Valmet Paper Machinery Inc
Publication of EP0319897A1 publication Critical patent/EP0319897A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention concerns a frame of a supercalender.
  • the supercalender frames known in prior art are high and narrow constructions. Under these circumstances, they are highly susceptible to vibration.
  • the excitation forces occurring in supercalenders are within, or very near, the ranges of natural frequencies. Thus, at those ranges, problems of vibration are constantly encountered.
  • a super­calender is a machine of a large mass with groups of revolving masses which cause considerable dynamic loads. Such revolving masses are, e.g., the jumbo roll, from which the paper enters into the machine and which is variably eccentric, the upper and lower rolls, whose diameters are larger than those of the other rolls, the fibre rolls, whose diameter becomes smaller in operation and in which eccentricity may arise.
  • a supercalender has a great number of iron rolls as well as alignment and spreader rolls.
  • Said revolving masses may be eccentric relative their journalling points, whereby the eccentricity causes harmonic excitation forces in the calender frame. Even little eccentricities of the masses in the rolls cause high forces, because the speeds of rotation are high and the rolls weigh several tons.
  • the weight of a whole stack of rolls, depending on the web width, may be up to 200 tons.
  • a paper roll to be unwound when placed on the unwind stand, may cause a considerable load on the supercalender frame.
  • the maximum diameter of a jumbo roll to be unwound varies from 2000 up to 3000 mm.
  • the mass of a full jumbo roll varies from 30 to 70 tons.
  • impact loads are produced on the machine.
  • considerable excitation forces are applied to the machine frame.
  • instantaneous openings of the nips in a calender stack produce a series of impact forces.
  • a supercalender frame may be subjected to numerous excitation forces causing vibration in the frame.
  • the object of the invention is a supercalender frame that is as rigid as possible and in which it has been possible to raise its lowest number of natural vibrations so that it does not occur in the range of the excitation frequencies applied to the supercalender frame.
  • a further object of the invention is to provide a supercalender frame whose construction is of lower weight as compared with the frame constructions of prior art. By means of a frame of lower weight, it is possible to raise the number of natural vibrations of the supercalender frame further.
  • a frame of lower weight is also more advantageous in respect of its cost of manufacture.
  • a non-indispensable additional object of the invention is to provide a supercalender frame that offers ample room for working.
  • the supercalender frame comprises a first diagonal beam, which is fitted so that one of its ends joins the vertical beam placed at the side of the calender stack, the bottom part of said vertical beam, and so that the other end joins the horizontal beam that supports the support plane for the unwind stand, favourably the middle area of said horizontal beam
  • the side frame comprises a second diagonal beam, one of whose ends joins the other vertical beam, favourably the lower part of said beam, whereas the other end joins the horizontal beam, favourably its middle area
  • the side frame comprises a third diagonal beam, which is fitted so that one of its ends joins the upper part of the vertical beam of the side frame placed at the side of the calender stack, whereas the other end joins the horizontal beam in its middle area.
  • the supercalender frame in accordance with the present invention By means of the supercalender frame in accordance with the present invention, considerably more favourable vibration properties have been obtained as compared with the prior-art frames.
  • the vibration levels in the super­calender frame of the invention are throughout lower than in the prior-art frames.
  • Vibration calculations have been carried out at a certain calculation point on the frame, whereby it has been possible to draw the vibration curves as a function of running speed.
  • the vibration amplitude has been determined as a function of running speed at a certain calculatory dimensioning point on the frame. Further, the speed of vibration of the dimensioning point has been determined as a function of the running speed of the paper web.
  • Fig. 1 shows a supercalender frame in accordance with the invention.
  • the supercalender frame comprises sub­stantially equivalent side frames 10 at both sides of the machine-direction longitudinal axis X of the supercalender.
  • Each side frame 10 is formed as a trussed construction in accordance with the invention.
  • Each side frame 10 of the supercalender comprises a first vertical beam 11 placed at the side of the vertical calender stack 20 and support­ing said stack of rolls, as well as a horizontal beam 12, which joins said vertical beam 11 in the middle area of its length.
  • the vertical beams 11 and 13 are placed so that their central axes are substantially parallel to each other, and, correspondingly, the horizontal beam 12 is placed so that its central axis is substantially perpen­dicular to said two vertical beams 11 and 13.
  • diagonal beams are fitted in the area between the vertical beams 11 and 13, the horizontal beam 12, and the base level T.
  • diagonal beams 14,15 and 16 whose central axes run diagonally relative the vertical plane, join the horizontal beam 12 substantially in its middle area.
  • the first diagonal beam 14 and the second diagonal beam 15 are fitted in the area between the first vertical beam 11, the second vertical beam 13, the horizontal beam 12, and the level T.
  • the first diagonal beam 14 is fitted to pass from the lower part, preferably from the proximity of the base plate T, of the vertical beam 11 of the side frame 10, placed at the side of the calender stack 20, to the middle area of the horizontal beam 12, in respect of the length of said horizontal beam 12.
  • reference numeral 17 denotes the unwind stand of the supercalender
  • reference numeral 18 denotes the reel-up of the supercalender.
  • the support plane 19 of the unwind stand 17 is placed between the side frames 10.
  • the side frames 10 are interconnected by means of transverse beams 21.
  • the paper web is denoted with broken lines and with the letter W in Figs. 2A and 3.
  • the vertical beams, the horizontal beam, and the three diagonal beams define tri­angular frame areas D1, D2,D3 and D4 in the side frame 10.
  • the construction in accordance with the invention has also become of low weight.
  • the frame of the invention it has been possible to raise the lowest natural vibration number of the whole super­calender frame as compared with the prior-art frame con­structions.
  • the weight of the construction has become low. In this way, ample room for working has also been provided in connection with the supercalender.
  • the rigidity that has been obtained by means of the construction has also permitted a reduction in the constructional dimensions, and thereby the cost of manufacture of the supercalender frame of the invention is lower than that of the prior-art frame solutions. Further, the reduced weight of the frame construction has raised the lowest natural vibration number of the frame. Under these circumstances, by means of the frame construction of the invention, it is possible to run at very high speeds while the vibration level of the frame of the machine, nevertheless, remains low. The running speed may be up to 1000 m/min, or even higher.
  • Fig. 2A shows the side frame 10 shown in Fig. 1 as seen in the direction of the arrow K in Fig. 1.
  • Fig. 2A is a plane view of the formation of the trussed construc­tion of the side frame.
  • the central axis of the first diagonal beam 14 is denoted with X1.
  • the central axis of the vertical beam 11 placed at the side of the calender stack 20 is denoted with X2.
  • the angle between the central axes of the vertical beam 11 and the diagonal beam 14 is ⁇ 1, being advantageously 30 to 60°, preferably about 45°.
  • the central axis X1 of the diagonal beam 14 inter­sects the central axis X3 of the horizontal beam 12 sub­stantially in, or at the proximity of, the middle area of the horizontal beam 12. Said intersection point is de­noted with P1′.
  • a second diagonal beam 15 which is fitted to pass from the lower area, pre­ferably from the proximity of the base T, of the second vertical beam 13 substantially to the middle area of the horizontal beam 12 or to the proximity of said middle area.
  • the vertical beam 13 is fitted to run so that its central axis runs in a vertical plane, and it is fitted to join the end of the horizontal beam 12 in the area between the centre point of the horizontal beam 12 and the end of the horizontal beam 12, and preferably at the proximity of said outer end.
  • the angle between the central axes X4 and X5 of the second diagonal beam 15 and the second vertical beam 13 is denoted with ⁇ 2.
  • the angle ⁇ 2 is advantageously also within the range of 30 to 60°, preferably about 45°.
  • the diagonal beam 15 joins the lower part of the second vertical beam 13 substantially at the proximity of the base level T, and at its other end it joins the horizontal beam 12 while, besides said horizontal beam 12, also joining the first diagonal beam 14 passed to said junction point.
  • the intersection point P1 ⁇ between the central axis X4 of the second diagonal beam 15 and the central axis X3 of the horizontal beam 12 is advantageously placed in the middle area of the horizontal beam 12, in respect of the length of said horizontal beam 12.
  • a further, third diagonal beam 16 is passed to the junction or node point between the hori­zontal beam 12 and the diagonal beams 14 and 15.
  • the diagonal beam 16 is fitted to join the horizontal beam 12, its upper face, substantially at the same point in re­spect of the length of the horizontal beam 12 as the diagonal beams 14 and 15 join said horizontal beam 12.
  • the third diagonal beam 16 is connected with the upper part of the first vertical beam 11, and at its other end it is fitted to join the horizontal beam 12 in the middle area of the horizontal beam 12.
  • the central axis X6 of the third diagonal beam 16 intersects the central axis X3 of the horizontal beam 12 at the point P1′ ⁇ .
  • the angle ⁇ 3 between the central axis X6 of the third diagonal beam 16 and the central axis X2 of the first vertical beam 11 is advantageously also within the range of 30 to 60°, preferably about 45°.
  • the longitudinal central axes X1,X4,X6 of the diagonal beams 14,15 and 16 intersect each other at the same point, which is denoted with the letter P1. Said intersection point is further placed on the longitudinal central axis X3 of the hori­zontal beam 12.
  • a set of coordinates is fixed by means of which a supercalender frame construction in accord­ance with the invention that has good rigidity properties is defined.
  • a plane illustration of the side frame 10 is shown.
  • X T intersection points of the central planes (X T ) of the longitudinal central axes of said beams (Fig. 2B).
  • longitudinal central main planes of the beams can also be meant equally well.
  • the starting point of the dimensioning consists of said central axes or central planes of the beams.
  • the starting point for the dimensioning of the horizontal dimensions has been the line parallel to the central axis X2 of the first vertical beam 11, placed at the side of the calender stack 20.
  • the starting level for vertical dimen­sioning has been the level of the base T.
  • L1 - horizontal distance between the centre line of the vertical beam 11 placed at the side of the calender stack 20 and the longitudinal central axis of the second vertical beam 13.
  • L1 is advantageously within the range of 4 m to 7 m.
  • L2 - is the illustrated horizontal distance of the point P1 from the centre line X2.
  • L2 is advantageously within the range of 2 m to 4 m, and L2 is advantage­ously within the range of 0.3 x L1 to 0.7 x L1 .
  • the most advantageous range for L2 is about 0.5 x L1.
  • L3 - is the distance of the end of the horizontal beam 12 from the coordinate line X2.
  • L3 is advantageously within the range of 5 m to 9 m.
  • H1 - is the distance of the centre line X3 of the horizon­tal beam 12 from the base level T. H1 is advantage­ously within the range of 3 m to 7 m.
  • H2 - is the distance of the upper end of the vertical beam 11 from the horizontal level T. H2 is advan­tageously within the range of 9 m to 11 m.
  • H3 is the distance of the intersection point P2 of the centre line X6 of the diagonal beam 16 and the centre line X2 of the vertical beam 11 from the horizontal level T. H3 is advantageously within the range of 6 m to 10 m.
  • ⁇ 1 - is the angle between the centre line X1 of the first diagonal beam 14 and the centre line X2 of the ver­tical beam 11, and the intersection point between said central axes of the beams is denoted with P3.
  • ⁇ 1 is advantageously within the range of 30° to 60°.
  • ⁇ 2 - is the angle between the central axis X4 of the second diagonal beam 15 and the central axis X5 of the second vertical beam 13, and the intersection point between the central axes of said beams is denoted with the letter P4.
  • ⁇ 2 is advantageously within the range of 30° to 60°.
  • ⁇ 3 - is the angle between the central axis X6 of the third diagonal beam 16, placed above the horizon­tal beam 12, and the central axis X2 of the verti­cal beam 11 placed at the side of the calender stack 20; the intersection point between the central axes X6 and X2 of the diagonal beam 16 and the vertical beam 11 is denoted with the letter P2.
  • ⁇ 3 is advan­tageously within the range of 30° to 60°.
  • H4 is advantageously within the range of 0.5 m to 1 m.
  • H5 is advantageously within the range of 0 to 1 m.
  • L1/H3 is within the range of 0.4 to 1.5, and preferably within the range of 0.6 to 1.
  • Fig. 2B shows a section I-I in Fig. 2A.
  • the central axis of the beam is denoted with X4.
  • the longi­tudinal central main plane of the beam is denoted with X T .
  • the plane passes substantially through the mass centre point of the beam and is parallel to the top and bottom planes of the beam.
  • the width L4 of the beam is advan­tageously within the range of 200 mm to 400 mm, and the height L5 of the beam is advantageously within the range of 500 mm to 1000 mm.
  • Fig. 3 shows an even more stable frame construc­tion, which differs from the basic form of a supercalender frame in accordance with the invention described above.
  • the solution of Fig. 3 is in the other respects fully similar to the solution shown in Figures 1 and 2A except that the frame construction includes a third vertical beam 22, which is fitted in the area between the first vertical beam 11 and the second vertical beam 13 halfway in the distance between them.
  • Said third vertical beam 22 is fitted to join the diagonal beams 14 and 15 so that the central axis X7 of the vertical beam 22 intersects the central axis X3 of the horizontal beam 12 substantially at a corresponding point as the central axes X1 and X4 of the diagonal beams 14 and 15 intersect the central axis X3 of the horizontal beam.
  • said common inter­section point is denoted with P5.
  • Such an embodiment of the invention is also possible that the third vertical beam 22 of the side frame joins the horizontal beam 12 directly without contacting the diagonal beams 14 and/or 15.
  • Fig. 4A illustrates an examination of the vibra­tion of a supercalender in accordance with the invention, corresponding to Figs. 1,2A,2B.
  • the figure shows the vibration amplitude of a measurement point on the super­calender frame as a function of the running speed of the paper.
  • the figure also shows corresponding vibration values of a frame in accordance with conventional technol­ogy.
  • the prior-art frame construction and its vibration are represented by the curve a
  • the curve b represents the vibration/running-speed curve of a frame corresponding to the embodiment of the invention shown in Figs. 1,2A,2B.
  • the running speed was increased by 200 m/min up to the upper limit 1000 m/min of the running speed.
  • the vibration amplitude of a con­ventional frame increases steeply when the upper limit of the running-speed range is approaching.
  • the difference between the vibration amplitudes of the supercalender frame of the invention and that of prior art is more than 50 per cent.
  • the vibration amplitude of a frame in accordance with the invention at the running speed of 1000 m/min is about 0.13 mm, and correspondingly the vibration of a prior-art frame at the running speed of 1000 m/min is about 0.33 mm.
  • the vibration amplitudes and vibration speeds are horizontal (direction of the x-axis), and the calcu­lation point is point E (in Fig. 1).
  • Fig. 4B shows the vibration speed of a supercalender frame in accordance with the invention (curve b) and of a prior-art frame (curve a) at a certain measurement point as a function of running speed.
  • the vibration speed increases steeply when the upper limit of the running-speed range approaches.
  • a vibration speed is attained for the measurement point which is, for example, about 7 mm/s.
  • a vibration speed is attained which is about 18 mm/s.
  • the difference between the vibration speeds is higher than 50 per cent.

Landscapes

  • Paper (AREA)
EP19880120303 1987-12-08 1988-12-05 Frame of a supercalender Withdrawn EP0319897A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI875404A FI82276C (fi) 1987-12-08 1987-12-08 Stomme foer superkalander.
FI875404 1987-12-08

Publications (1)

Publication Number Publication Date
EP0319897A1 true EP0319897A1 (en) 1989-06-14

Family

ID=8525530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880120303 Withdrawn EP0319897A1 (en) 1987-12-08 1988-12-05 Frame of a supercalender

Country Status (2)

Country Link
EP (1) EP0319897A1 (fi)
FI (1) FI82276C (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008011475U1 (de) 2008-08-28 2008-10-30 Metso Paper, Inc. Ständer eines Kalenderrahmens
CN113605133A (zh) * 2021-07-21 2021-11-05 衢州五洲特种纸业股份有限公司 一种用于描图纸的压光机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT225019B (de) * 1960-07-07 1962-12-27 Zum Bruderhaus Ges Mit Beschra Bahnumführungsvorrichtung für Kalander od. dgl., insbesondere für Papierkalander

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT225019B (de) * 1960-07-07 1962-12-27 Zum Bruderhaus Ges Mit Beschra Bahnumführungsvorrichtung für Kalander od. dgl., insbesondere für Papierkalander

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008011475U1 (de) 2008-08-28 2008-10-30 Metso Paper, Inc. Ständer eines Kalenderrahmens
CN113605133A (zh) * 2021-07-21 2021-11-05 衢州五洲特种纸业股份有限公司 一种用于描图纸的压光机

Also Published As

Publication number Publication date
FI82276B (fi) 1990-10-31
FI875404A (fi) 1989-06-09
FI875404A0 (fi) 1987-12-08
FI82276C (fi) 1991-02-11

Similar Documents

Publication Publication Date Title
US3044392A (en) Papermaking machine
US6156158A (en) Method and apparatus for damping contact oscillations of rotating rolls
CA2365458A1 (en) Method in the calendering of paper or of an equivalent web material and a calender that makes use of the method
US4021296A (en) Method and device for manufacturing a continuous material web of elongated fibrous particles
US20020185567A1 (en) Process and device for active vibration damping for winding machines
CA2176957A1 (en) Winding machine
EP0319897A1 (en) Frame of a supercalender
US4128053A (en) Supercalenders
US4131063A (en) Calender
US20060162804A1 (en) Papermaking screen
FI112878B (fi) Menetelmä ja sovitelma päällystysaseman teräpalkin värähtelyjen vaimentamiseksi
US3340796A (en) Paper supercalender stack
CA2277426C (en) Calender for webs of paper or similar material
US3168435A (en) Method and means for mounting, driving and supporting rolls for endless moving bands
EP0476040B1 (en) Embossed wrapping paper
CN1247501A (zh) 纸板芯的结构层、用这种结构层制造的纸板芯和改进纸板芯刚度的方法
US6361655B1 (en) Beam structure in a pulp machine/paper machine/board machine or in a paper/board finishing device
US20060113422A1 (en) Winder
FI110713B (fi) Vaimenninlaite nipin muodostavan telaparin värähtelyn vaimentamiseksi paperi- tai kartonkikoneessa
US20090314447A1 (en) Arrangement and Methods for Increasing Productivity of a Tissue Papermaking Machine or Minimizing its Dimensions
KR20010034348A (ko) 제지 산업용의 개선된 척 강도를 가지는 판지 코어 및 그제조 방법
US7017479B2 (en) Calender
CA2276555C (en) Paper machine edge fiber alignment control by angled headbox sides
US3105789A (en) Baffle for paper machine
JPS6025784B2 (ja) カ−ル発生量を抑制した記録用紙

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE FR GB IT SE

17P Request for examination filed

Effective date: 19891130

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19910703