EP1225274B1 - Procédé pour le traitement d' une bande de matière et calandre - Google Patents

Procédé pour le traitement d' une bande de matière et calandre Download PDF

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Publication number
EP1225274B1
EP1225274B1 EP01129894A EP01129894A EP1225274B1 EP 1225274 B1 EP1225274 B1 EP 1225274B1 EP 01129894 A EP01129894 A EP 01129894A EP 01129894 A EP01129894 A EP 01129894A EP 1225274 B1 EP1225274 B1 EP 1225274B1
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EP
European Patent Office
Prior art keywords
web
rolls
nip
calender
soft
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.)
Revoked
Application number
EP01129894A
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German (de)
English (en)
Other versions
EP1225274A3 (fr
EP1225274A2 (fr
Inventor
Rolf Van Haag
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.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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Filing date
Publication date
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1225274A2 publication Critical patent/EP1225274A2/fr
Publication of EP1225274A3 publication Critical patent/EP1225274A3/fr
Application granted granted Critical
Publication of EP1225274B1 publication Critical patent/EP1225274B1/fr
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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 relates to a method for treating a material web, in which the material web is guided through a plurality of soft nips in a roll stack and pressurized there. Furthermore, the invention relates to a calender with a roll stack of a plurality of rollers forming a plurality of soft nips in which a material web is pressurized.
  • Paper webs are guided in the course of their manufacture by calenders and there pressurized and optionally also elevated temperature. On the one hand, this calendering achieves a compaction of the paper web, on the other hand one can achieve certain surface properties, in particular smoothness and gloss.
  • calenders as they are known, for example, from DE-A-195 08 349, center rolls are used, which are covered with a plastic covering. With prolonged use of these calenders, there is an undesirable vibration problem, a so-called barring phenomenon.
  • This barring phenomenon is characterized by strip-shaped markings of the elastic rollers, more precisely, their plastic coverings. These markings are formed when the paper web is being treated in the paper web. As soon as these markings become visible there, the paper web is considered as scrap.
  • the invention has for its object to reduce the barring phenomenon.
  • This object is achieved in a method of the type mentioned above in that the material web is pre-smoothed before passing through the nips by being passed without slip through an additional nip formed between two soft rolls.
  • a roll stack which is formed from several rolls, has a large number of natural frequencies. This does not mean the natural frequencies of the rolls per se, such as bending natural frequencies, but the natural vibration modes that result from the oscillating roll masses on the spring and damper systems of the interposed plastic linings.
  • a running calender generates exciter forces whose frequencies are composed of multiples of the rolling speeds. These excitation forces can result from inhomogeneities, anisotropies or geometrical errors (roundness) be justified. Also, paper thickness variations of the calender passing through the paper web can excite the roll stack. If one of these excitation frequencies hits a natural frequency, then the vibration system responds with increased oscillations. Due to the large number of possible pathogens and the large number of possible modes of natural vibration, these resonance points can not practically be avoided in terms of design. In general, the vibration system is so strongly damped and the excitation forces are so small that the resulting oscillatory movements are not directly disturbing.
  • the invention is based on the assumption that a paper web entering the calender is never completely free of variations in basis weight or thickness before treatment. In addition, a paper web is still very rough. If one analyzes the fluctuations on their frequencies, then one usually detects a broadband noise, in which all frequencies are contained. Thus, an excitation of one or more natural frequencies of the roller system through the paper web is inevitable. The calender reacts at these natural frequencies with an increased amplitude, which initially, as already described above, is not disturbing. Over time, however, the increased amplitudes are reflected in the plastic pads, and thus there is feedback in the vibration system. Although such feedback can not be completely avoided, the additional step of pre-smoothing the web of material allows for the amount of time needed to make the markings visible.
  • an additional nip formed between two soft rolls is a particularly simple means for pre-smoothing the web. Although such a nip is generally considered to be practically ineffective for the treatment of a material web. But it is enough to give the paper web a "provisional" or provisional smoothing, which leads to the formation of a barring phenomenon takes much longer than before. If you pass the web without slippage through the additional nip, then there is no sliding area in the contact zone between the web and the two soft rolls that form the nip. The entire contact zone between the rollers and the material web, which is relatively wide due to the elastic surface covering of the soft rolls and the associated flattening of the rolls in the nip, forms an adhesive area.
  • the web is treated the same on both sides. So you use on both sides of the web like rolls, ie rolls with the same diameter and the same surface properties.
  • the object is also achieved by a calender of the type mentioned above, namely, that an additional nip is provided outside of the roll stack, which is formed by two soft driven rollers with the same surface properties, which have a peripheral speed, the speed of the continuous web equivalent.
  • the additional nip serves to pre-smooth the web of material.
  • Vorglätten is achieved that less exciter frequencies and reduced exciter amplitudes are entered into the actual roll stack. The material web is thus guided without slippage through the nip, so that the rollers that form this additional nip, can not wear out.
  • a trajectory of the additional nip is provided in a nip which is bounded by an end roll.
  • This nip forms the first nip of the roll stack, which passes through the material web. It is therefore necessary to smooth the material web before it is treated in one of the nips of the roll stack.
  • the two rolls forming the additional nip are arranged laterally offset in the web running direction relative to the roll stack. This has the advantage that vibrations in the calender in the roll level can not propagate to the rolls, which form those additional nip. Although complete decoupling between the roller stack and the two additional rollers will not be achieved. However, if already the vibration direction can no longer hit the location of the additional nip, sufficient damping is ensured.
  • the two rollers forming the additional nip have the same diameter and the same surface properties. This ensures that the web is treated evenly or symmetrically from its two sides. Due to the pre-smoothing in the additional nip so no additional disturbances one-sided type are entered into the web.
  • both rollers are driven with the same drive power. This again gives symmetrical conditions in the nip.
  • FIG. Shows a calender.
  • a calender 1 has a roll stack of several, in the present case eight, rolls 3-10, which are arranged in a stiffening 11.
  • the rollers 3, 5, 6, 8, 10 are formed as "soft rolls", i. they have an elastic surface covering, preferably made of a plastic.
  • the remaining rollers 4, 7, 9 are formed as so-called “hard” rollers, i. the surface of these rollers 4, 7, 9 consists of a largely unyielding metal.
  • the intermediate or middle rollers 4-9 are mounted on levers 12. When the lower end roll 10, which is supported by a piston-cylinder drive 13, is lowered, then the rolls can move away from each other.
  • the rollers 3-10 form therebetween nips 14-20, of which the nips 14, 15 and 17-20 are formed as soft nips, while the nip 16 is formed as a change nip.
  • the soft nips are limited by a soft roller and a hard roller, while the alternating nip is limited by two soft rollers.
  • a web of material 21 in this case a paper web, guided, which is unwound from a roll 22.
  • the material web 21 it is also possible for the material web 21 to come directly from a production machine, for example a paper machine.
  • the roll stack 2 is arranged at an angle of about 45 ° to the vertical.
  • the roll stack 2 may also have less or more than the illustrated eight rolls. However, it should have at least four rollers, so that at least three nips can be formed.
  • an additional nip 23 is provided, which is formed by two soft rolls 24, 25.
  • the two soft rolls 24, 25 have the same structure, i. They have the same diameter and the same surface and are otherwise structurally identical.
  • the two rollers 24, 25 each have a drive 26, 27, so are driven.
  • the drive power is distributed symmetrically.
  • the drive is effected so that the rollers 24, 25 have a circumferential speed which corresponds to the speed of the material web 21.
  • the contact between the web 21 and the two rollers 24, 25 in the nip 23 is completely slip-free, i. the contact zone has no sliding area.
  • the entire contact zone forms a detention area. Since wear can only arise in connection with friction or relative movement, such as in a calender, where a hard runs against a soft roll, the periodic wear is excluded by a superimposed oscillatory motion.
  • the web 21 is flattened by the two soft rolls 24, 25, i. a rough material web is pre-smoothed without the two rollers 24, 25 itself wear. As a result, fewer exciter frequencies and lower exciter amplitudes are introduced into the calender by means of a pre-smoothed material web 21.
  • the two rollers 24, 25 are arranged outside a press plane of the roll stack 2, that is, the axes of the soft rolls 24, 25, which form the additional nip 23 lie not in the same plane as the axes of the rolls of the roll stack. This is based on the consideration that the vibrations are particularly critical, which propagate in the direction of the press plane, ie the plane in which the axes of the rollers 3-10 of the roll stack 2 are arranged. If one then takes out the two rollers 24, 25 of the additional nip 23 from this direction of propagation, one has already achieved a principal decoupling of the vibrations in the roll stack 2.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (9)

  1. Procédé de traitement d'une bande de matériau (21) dans lequel la bande de matériau (21) est guidée à travers plusieurs lignes de contact souples (14, 15, 17-20) dans un empilement de rouleaux (2) et y est sollicitée en pression, caractérisé en ce que la bande de matériau est prélissée avant le passage à travers les lignes de contact (14, 15, 17-20) en étant guidée sans glissement à travers une ligne de contact supplémentaire (23) qui est réalisée entre deux rouleaux souples (24, 25).
  2. Procédé selon la revendication 1, caractérisé en ce que l'on entraîne les deux rouleaux (24, 25) formant la ligne de contact supplémentaire (23).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on traite la bande de matériau (21) de la même manière des deux côtés.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on dispose la ligne de contact supplémentaire (23) en dehors d'un plan dans lequel sont disposées les lignes de contact de l'empilement de rouleaux (2).
  5. Calandre comprenant un empilement de rouleaux (2) constitué de plusieurs rouleaux qui forment plusieurs lignes de contact souples (14, 15, 17-20), dans lesquelles une bande de matériau (21) peut être sollicitée en pression, caractérisée en ce qu'en dehors de l'empilement de rouleaux (2) est prévue une ligne de contact supplémentaire (23) qui est formée par deux rouleaux souples entraînés (24, 25) avec les mêmes propriétés de surface, qui présentent une vitesse périphérique qui correspond à la vitesse de la bande de matériau (21) en mouvement.
  6. Calandre selon la revendication 5, caractérisée en ce que l'on prévoit une allure de bande de la ligne de contact supplémentaire (23) dans une ligne de contact (14) qui est limitée par un rouleau d'extrémité (3).
  7. Calandre selon la revendication 5 ou 6, caractérisée en ce que les deux rouleaux (24, 25) formant la ligne de contact supplémentaire (23) sont disposés de manière décalée latéralement par rapport à l'empilement de rouleaux (2) dans la direction d'avance de la bande.
  8. Calandre selon l'une quelconque des revendications 5 à 7, caractérisée en ce que les deux rouleaux (24, 25) formant la ligne de contact supplémentaire (23) présentent le même diamètre.
  9. Calandre selon la revendication 8, caractérisée en ce que les deux rouleaux (24, 25) sont entraînés avec la même puissance d'entraînement.
EP01129894A 2001-01-12 2001-12-15 Procédé pour le traitement d' une bande de matière et calandre Revoked EP1225274B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10101182 2001-01-12
DE2001101182 DE10101182C1 (de) 2001-01-12 2001-01-12 Verfahren zum Behandeln einer Materialbahn und Kalander

Publications (3)

Publication Number Publication Date
EP1225274A2 EP1225274A2 (fr) 2002-07-24
EP1225274A3 EP1225274A3 (fr) 2003-02-12
EP1225274B1 true EP1225274B1 (fr) 2006-04-05

Family

ID=7670354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01129894A Revoked EP1225274B1 (fr) 2001-01-12 2001-12-15 Procédé pour le traitement d' une bande de matière et calandre

Country Status (2)

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EP (1) EP1225274B1 (fr)
DE (2) DE10101182C1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB204328A (en) * 1922-09-19 1924-05-01 C G Haubold Ag New or improved calendering process

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0374292B1 (fr) * 1988-12-22 1993-09-01 Felix Schoeller jr. Papierfabrik GmbH & Co. KG Procédé et dispositif pour le lissage et le calibrage d'un papier, en particulier d'un papier de base photographique
DE4011394C1 (fr) * 1990-04-09 1991-11-28 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
DE19508349C2 (de) * 1995-03-09 2003-04-03 Voith Paper Patent Gmbh Kalander für die Behandlung einer Papierbahn und Verfahren zu dessen Betrieb
FI112965B (fi) * 1999-11-05 2004-02-13 Metso Paper Inc Kalanterointisovitelma paperikonetta varten
FI4460U1 (fi) * 2000-02-21 2000-06-02 Valmet Corp Kalanteri

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB204328A (en) * 1922-09-19 1924-05-01 C G Haubold Ag New or improved calendering process

Also Published As

Publication number Publication date
DE10101182C1 (de) 2002-01-24
DE50109429D1 (de) 2006-05-18
EP1225274A3 (fr) 2003-02-12
EP1225274A2 (fr) 2002-07-24

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