CA2027460C - Calender for surface treatment of material webs - Google Patents

Calender for surface treatment of material webs Download PDF

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Publication number
CA2027460C
CA2027460C CA 2027460 CA2027460A CA2027460C CA 2027460 C CA2027460 C CA 2027460C CA 2027460 CA2027460 CA 2027460 CA 2027460 A CA2027460 A CA 2027460A CA 2027460 C CA2027460 C CA 2027460C
Authority
CA
Canada
Prior art keywords
roller
calender
fixed
pressing
fixed roller
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 - Fee Related
Application number
CA 2027460
Other languages
French (fr)
Other versions
CA2027460A1 (en
Inventor
Peter Heitmann
Karl Volz
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss 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
Priority to DEP3936128.4 priority Critical
Priority to DE19893936128 priority patent/DE3936128C2/de
Application filed by Sulzer Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Publication of CA2027460A1 publication Critical patent/CA2027460A1/en
Application granted granted Critical
Publication of CA2027460C publication Critical patent/CA2027460C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00Calenders; Smoothing apparatus
    • D21G1/002Opening or closing mechanisms; Regulating the pressure

Abstract

A calender for surface treatment of material webs, wherein in the event of one sided seizure of an intermediate roller the fixed roller not subject to pressure is adjusted in position at one end such that the asymmetrical linear force profile resulting from the seizure is symmetrically adjusted according to the desired condition in order to optimise processing of the material web.

Description

20?760 Calender for Surface Treatment of Material Webs The invention relates to a calender for treating material webs, comprising at least one fixed roller which in operation is fixedly supported in the pressing direction and at least one movable roller which is mounted for free movement in the pressing direction.
Such calenders are fairly well known. In particular, the roller journals are mounted in elongate guides for free movement in the pressing direction, so that they function as movable rollers and are subject to limited movement in these guides.
In this connection, problems arise from the fact that considerable frictional forces can act in these guides even to the extent of a more or less seizing effect. As a result, for example with a vertically extending calender, the expected pressing force in the roller gap of the fixed roller can possibly be too high or too low on one side, according to whether an increase or decrease of the pressing force was executed. This leads to pressing forces deviating from the desired value and/or to inclined press force profiles in the roller gap, the latter occurring since the friction forces are not always equally large in the roller guides.
It has already been attempted many times to moderate the effect of these frictional or seizing phenomena by artificial shaking or moving of the entire roller assembly in order to loosen the frictional forces. Also it has been attempted to provide a remedy in that according to circumstances a greater or smaller additional load is applied by the movable roller until the desired pressing forces are present at the fixed roller.

20~7~~~
In this way, it is partially achieved that with approximately constant friction, the actual value of the central line force or the central line force profile in the roller gap on the fixed roller, taken as a measure of the smoothing process, is brought to the desired value. In many cases however it occurred that the friction was increased until the guide seized as a direct result of the mentioned techniques. In every case the line forces in the roller gaps, which are located between the rubbing or seizing roller and the moving roller experiencing the additional loading, are incorrect which leads to a considerable disturbance of the rolling process.
Therefore, the object of the invention consists in providing a calender in which the mentioned friction and seizing are avoided in a simple and reliable manner, or at least in which their disadvantageous effect can be mitigated without for example having to alter considerably an existing calender.
This object is achieved according to the invention by an arrangement for measuring the pressing forces on the fixed roller 12, an arrangement for adjusting the fixed roller 12 in the pressing direction, an arrangement for comparing the desired value of the pressing force with the actual measured pressing force on the fixed roller, and a control device for controlling the adjusting arrangement according to the comparison between the actual and desired values for achieving the desired pressing forces on the fixed roller in the roller gap. The desired value of the pressing force on the fixed roller is thus derived from the components of the weight forces acting in the pressing direction of the supporting parts movable across the fixed roller in the pressing direction as well as the forces impressed on the displaceable rollers.
This solution makes use of the idea of making the roller 20~7G~~
provided as such for operating as a fixed roller at least selectively movable at the ends in the pressing direction, in dependence upon the supporting forces measured at the fixed roller, which are largely determined by the pressing forces. The claimed principle operates generally both upwardly and also downwardly (vertically extending calender) and also in any other relative position of the rollers, as for example horizontally where the calender is horizontal. In this connection, a supplementary load can be applied both from above and also from below or from right or left.
With use of the invention, the disadvantage effect of the frictional forces can be avoided not only on the adjusted fixed roller but also in the roller gaps between the adjusted fixed roller and the roller on which the harmful frictional force appears.
According to the invention it is not necessary to know which of the rollers is rubbing or seizing in its guides.
As the smallest unit, one fixed roller can be combined with one movable roller.
Also movable rollers, which exert supplementary forces are conceivable.
In conjunction with an upright calender, the fixed roller can be provided either as the uppermost or as the lowermost roller.
In conjunction with a horizontal calender, the fixed roller can be provided either as the outermost right hand or the outermost left hand roller.
It is also possible to provide the fixed roller in the intermediate region of the calender.

20'~7~6a The fixed roller itself can expediently be constructed as a deflecting equalization roller with fixed lateral bearings of the roller sleeve (so-called NIPCO-K roller).
Also the fixed roller can be constructed as a deflecting equalization roller with a roller sleeve movable in the pressing direction over its entire length, which sleeve can be fixed by a distance measuring arrangement at a selectable position for operation in the pressing direction (so-called NIPCO-F roller with position control).
The movable roller, which can apply supplementary forces, is advantageously conceivable as a deflecting equalization roller with a roller sleeve movable in the pressing direction.
For measuring the load on the rollers, load cells can be employed or also hydraulic or pneumatic pressures can be derived from the loading systems of the rollers.
For changing the position of the front ends of the respective fixed roller, jacking devices, piston systems or other mechanical arrangements can be used.
In conjunction with a fixed roller as deflecting equalization roller with a roller sleeve movable in the pressing direction over the entire length, which sleeve can be fixed by means of a distance measuring arrangement at a selectable position for operating in the pressing direction, the said adjustment can be performed by modifying the selectable position, e.g. by appropriate inputs into a controller fixing the position of the roller sleeve, or by modifying the position of the entire deflecting equalization roller. Another possible technique is to reduce artificially the clearance at the distance measuring arrangement and thus to initiate readjustment.

20274~aA
Readjustment of the position of the fixed roller towards or away from the rubbing or seizing roller can be separately automated at both roller ends in dependence upon the actual-desired pressure force difference between the fixed and movable rollers.
Further advantageous configurations appear from the subsidiary claims.
The invention will now be described in the following in more detail on the basis of exemplary embodiments illustrated purely schematically in the drawings, in which:
Fig. la shows a schematic view of a calendar;
Fig. lb shows a schematic side view of the calendar according to Fig. la;
Figs. 2a to 2e show various upright calendars and a horizontal calendar; and Figs. 3a and 3b show a two roller construction in longitudinal and transverse section.
A calendar consists of a plurality of rollers arranged behind one another which form a roller gap therebetween, through which passes the paper web to be smoothed. With an upright calendar according to Figs. la and lb, a lower roller 12 and an upper roller 14 are provided with intermediate rollers 16, 17 and 18 arranged therebetween.
A portion of the intermediate rollers is not illustrated in Fig. la. Although either the upper or the lower roller or even an intermediate roller can be provided as a so-called fixed roller, in the example illustrated in Fig.
la, the lower roller 12 is constructed as a so-called NIPCO roller having a roller sleeve 13 and a yoke 15. This roller here represents a so-called fixed roller. These NIPCO rollers can be constructed in various ways. To form a so-called NIPCO-R roller, the roller sleeve 12 is itself mounted laterally and bending equalization of the sleeve takes place by means of intermediate supports which can be 20~7~~~
loaded using hydraulic oil. With the so-called NIPCO-F
roller, the roller sleeve is no longer laterally supported, but rather the support takes place only over the length of the roller sleeve on the yoke. Such a NIPCO
roller is a known deflection equalization roller.
On the roller sleeve 13 or on the yoke 15 is located a position sensor 20 which is coupled to a position controller 22. The deflection equalization supports represented by the arrows 24 are supplied with hydraulic oil in order to apply differential pressure on a linear force profile in the roller gap 26 between the intermediate roller 18 and the lower fixed roller 12 across the length of the roller. The control of the hydraulic oil pressure is performed by means of an oil pressure controller 28 coupled to the position controller.
The oil pressure at various positions of the roller gap can be displayed graphically on a monitor via lines 30.
The position sensor 20 reports the actual position of the NIPCO roller sleeve 13 to the position controller 22 which continuously corrects the oil pressure of all zones in such a manner that the NIPCO roller sleeve 13, and thus the entire roller assembly assumes a definite horizontal height position and maintains it. The entire roller assembly floats as it were within quite narrow limits.
The rollers are guided by lateral journals 32 engaging in vertical guides. The rollers normally lie on one another in the vertical calender as a result of the weight of the rollers themselves. However, also according to the arrows 34 a supplementary pressure can be applied laterally to the upper roller 14. In this connection, the upper roller 14 can likewise be a NIPCO roller.
If for example seizure occurs on the right hand side in the vertical guide of intermediate roller 17, this results _ 7 _ 2Q~~~6a in upward deflection of the roller sleeve 13 (NIPCO
sleeve) so that the position sensor 20 on the right hand side in Fig. 1 experiences distancing in the vertical direction between the associated sensor components. Thus, on the seizing side the position sensor registers the reduced loading as a small upward movement of the sleeve and thus controls a correspondingly reduced oil pressure on this side. The linear forces now applied by the self-loading NIPCO roller uniformly increase from the side where seizing occurs up to full loading on the opposite side which is displayed as an inclined linear force profile on the monitor via the lines 30. A differing linear profile is illustrated by the arrows of differing length in the region of the NIPCO roller in Fig. la.
According to the invention, the lower roller 12 arranged as a fixed roller on the right hand side, i.e. on the side of the seizure, is now moved upwardly in such manner that again a uniform linear force profile across the length of the roller is set according to the desired values. This means that the actual fixed roller is adjustable in the direction of the remaining rollers for re-regulation at least at the ends.
It should also be mentioned that in the event of seizure on the right hand side of the intermediate roller 17 the conditions above this roller remain satisfactory, as indicated by the arrows at that point in Fig. la. The conditions beneath the seizure are brought back to the desired condition by the regulation across the entire length of the rollers.
Fig. 2 shows in schematic representation vertical calenders in Figs. 2a to 2d and a horizontal calender in Fig. 2e. In Fig. 2a, the rollers 14 and 16 are movable rollers which are guided by means of guide components 17 in vertical guides 19. The lower roller 12 is here a fixed roller.

_ g _ ~G
In Fig. 2b, the upper roller 14 is fixed in just the same way as the lower roller 12, which however can here be moved by a jacking unit 21 for active pressure force application. Also this movement can be subject to seizure.
In Fig. 2c, the lower roller 12 is fixed, the upper roller 14 being movable vertically by a jacking unit 21 for pressure force application.
Fig. 2d shows how the calender in Fig. 2b may have a lower roller 12 movable by a jacking unit 21 as well as a fixed intermediate roller 14 " .
In the horizontal calender of Fig. 2e, the right hand outer roller 14' is fixed and the outer left hand roller 12' is movable by a jacking unit 21'. The intermediate rollers 16' are likewise movable with guide components 12' in a guide 19'.
In order to simplify this system, a measurement can be performed separately at both ends of the fixed roller. In this connection, it is irrelevant whether the loading is applied by the self weight and an additional load above in the vertical calender or is applied by force application below. In each case it has to be ensured that, taking account of the desired loading, the actual loading appearing in the event of seizure possibly also on one side is eliminated and brought back to the desired value by slight movement of the fixed roller at the corresponding end. The hydraulic or pneumatic pressures of the pressure application system may for example serve as measures of the loadings.
The possibility also exists of determining the respective actual value in the region of the support of the fixed roller using load cells and then performing regulation to the desired value. For position change of the respective 20~.~v6a fixed roller, jacking devices, piston systems or other mechanical arrangements are suitable.
Also measuring and positioning systems can occur in combination, as for example the so-called "floating stack principle" with position sensors in combination with self-loading NIPCO rollers.
Readjustment of the position of the fixed roller towards or away from the rubbing roller can be automated in dependence upon the difference between the desired Pressure deviation of the two extreme superimposed roller gaps, separately at both roller ends. For the system, it is not necessary to know which of the rollers is rubbing or seizing in its guides.
Figs. 3a and 3b show a two roller system. This includes two so-called NIPCO-F rollers. The roller sleeve 13 is supported via pressure rams 42 on the yoke 15, where these pressure rams can be selectively activated via a chamber 43 and an oil conduit 44, as shown by the arrows in Fig.
3a in the region of the pressure rams. The outer edge of the roller sleeve 13 is supported via a bearing 40 on a connecting member 38. This connecting member is movable vertically on a guide of the yoke 15, as indicated by the arrow in Fig. 3b. Thus it can be moved vertically relative to the yoke 15 in dependence upon the pressure force exerted by the pressure rams on the applied pressing force, along the corresponding vertical guide surfaces 50.
The mentionded seizing can occur there as a result of the increased friction. The movement of the roller sleeve 13 relative to the yoke 15 can be determined by a displacement transducer 46. Here, the possibility exists of compensating disharmony of the pressing forces in the event of seizure occurring solely by use of simple software control.

Claims (14)

1. Calender for treating material webs, comprising:
at least one fixed. roller which in operation is rigidly supported in a pressing direction;
at least one movable roller which is mounted for free movement in the pressing direction;
means for measuring pressing forces on the fixed roller;
means for adjusting the fixed roller in the pressing direction;
means for comparing a desired pressing force with actual measured pressing force on the fixed roller; and control means for controlling the adjusting means according to a comparison between the actual and desired values of forces for achieving the desired pressing force on the fixed roller.
2. Calender according to claim 1 wherein one fixed roller and one movable roller are provided.
3. Calender according to claim 1 wherein the fixed roller is provided as an uppermost roller in a vertical calender.
4. Calender according to claim 1 wherein the fixed roller is provided as a lowermost roller in a vertical calender.
5. Calender according to claim 1 wherein the fixed roller is provided as an outermost right hand roller in a horizontal calender.
6. Calender according to claim 1 wherein the fixed roller is provided as an outermost left hand roller in a horizontal calender.
7. Calender according to claim 1 wherein the fixed roller is provided in an intermediate region on the calender.
8. Calender according to claim 1 wherein the fixed roller is constructed as a deflection equalization roller with fixed lateral rotational mounting of a roller sleeve.
9. Calender according to claim 1 wherein the fixed roller is constructed as a deflection equalization roller with a roller sleeve movable in the pressing direction over its entire length which for operation can be fixed at a selectable position in the pressing direction with aid of a distance measuring arrangement.
10. Calender according to claim 1 wherein at least one movable roller is arranged for application of a supplementary load which can be measured.
11. Calender according to claim 9 wherein the measuring arrangement is operable to determine hydraulic or pneumatic pressures from a loading system of at least one roller.
12. Calender according claim 1 wherein said measuring means comprises at least one load cell.
13. Calender according to claim 1 wherein said adjusting means comprises a jacking device.
14. Calender according to claim 1 wherein said adjusting means comprises a hydraulic or pneumatic piston system.
CA 2027460 1989-10-30 1990-10-12 Calender for surface treatment of material webs Expired - Fee Related CA2027460C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEP3936128.4 1989-10-30
DE19893936128 DE3936128C2 (en) 1989-10-30 1989-10-30

Publications (2)

Publication Number Publication Date
CA2027460A1 CA2027460A1 (en) 1991-05-01
CA2027460C true CA2027460C (en) 2000-03-28

Family

ID=6392534

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2027460 Expired - Fee Related CA2027460C (en) 1989-10-30 1990-10-12 Calender for surface treatment of material webs

Country Status (5)

Country Link
AT (1) AT399175B (en)
CA (1) CA2027460C (en)
DE (1) DE3936128C2 (en)
FI (1) FI95938C (en)
GB (1) GB2237584B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9314568U1 (en) * 1993-09-27 1995-02-02 Kuesters Eduard Maschf Roller
FI96334C (en) * 1993-11-24 1996-06-10 Valmet Paper Machinery Inc Method for calendering paper or similar web material and calender applying the method
DE19520479C2 (en) * 1994-06-23 1996-07-11 Kuesters Eduard Maschf Calibration calender for plastic films
DE19511145C2 (en) * 1995-03-27 2000-07-13 Voith Sulzer Finishing Gmbh Calender for double-sided paper treatment
DE29720192U1 (en) 1997-11-14 1999-03-25 Kuesters Eduard Maschf Calender for treating a web
DE102009050201A1 (en) 2009-10-21 2011-04-28 Fleissner Gmbh Calendar device for treatment of e.g. plastic film, has supporting bodies provided below roller for changing linear pressure of roll gap between rollers, where bodies are impinged on outer circumference of rollers

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119324A (en) * 1960-08-29 1964-01-28 Beloit Iron Works Controlled deflection roll
CH589806A5 (en) * 1975-03-04 1977-07-15 Escher Wyss Ag
DE2738781A1 (en) * 1977-08-27 1979-03-08 Ema Elektronik Maschinen Appar Paper-making roller press section - has a pressure measurement taken at the roller stub axle
CH626273A5 (en) * 1978-04-18 1981-11-13 Escher Wyss Ag
JPS638239B2 (en) * 1978-10-16 1988-02-22 Kleinewefers Gmbh
AT369063B (en) * 1979-05-10 1982-12-10 Escher Wyss Ag Rolling device for rolling sheet-shaped materials
DE3004914C2 (en) * 1980-02-09 1982-07-15 Kleinewefers Gmbh, 4150 Krefeld, De
DE3004913C2 (en) * 1980-02-09 1982-07-15 Kleinewefers Gmbh, 4150 Krefeld, De
DE3101429C2 (en) * 1981-01-14 1987-10-29 Sulzer-Escher Wyss Ag, Zuerich, Ch
DE3117398C2 (en) * 1981-05-02 1987-08-06 Sulzer-Escher Wyss Ag, Zuerich, Ch
DE3117516C2 (en) * 1981-05-02 1984-07-26 Escher Wyss Ag, Zuerich, Ch
CH656812A5 (en) * 1982-04-08 1986-07-31 Escher Wyss Ag Rolling device.
DE3325385C2 (en) * 1983-07-14 1988-11-03 Kleinewefers Gmbh, 4150 Krefeld, De
DE3338625C2 (en) * 1983-10-17 1986-11-20 Sulzer-Escher Wyss Ag, Zuerich, Ch
FI79875C (en) * 1983-10-17 1990-03-12 Escher Wyss Ag Calendar
DE3416210C3 (en) * 1984-05-02 1994-07-14 Kleinewefers Gmbh Roller press for paper and similar webs
DE3533210C2 (en) * 1985-09-18 1990-02-08 Kuesters, Eduard, 4150 Krefeld, De
DE3640161C2 (en) * 1985-12-23 1989-01-26 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
EP0229210A1 (en) * 1986-01-16 1987-07-22 MOOG GmbH Regulator for a roller having hydrostatic supporting elements
DE3622398C1 (en) * 1986-02-18 1987-06-19 Escher Wyss Ag Sepg. calender rolls - involves lowering pressure in hydraulic carrier support installations with time delay w.r.t. pressure to prevent damage to roll surface
DE3767476D1 (en) * 1987-05-09 1991-02-21 Kleinewefers Gmbh Method for operating a rolling machine and control arrangement for carrying out this method.

Also Published As

Publication number Publication date
GB2237584A (en) 1991-05-08
FI904759D0 (en)
DE3936128C2 (en) 1991-11-21
FI95938C (en) 1996-04-10
FI904759A0 (en) 1990-09-27
CA2027460A1 (en) 1991-05-01
FI95938B (en) 1995-12-29
ATA162490A (en) 1994-08-15
GB2237584B (en) 1994-03-09
AT399175B (en) 1995-03-27
DE3936128A1 (en) 1991-05-02
GB9022049D0 (en) 1990-11-21

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