EP0648893B1 - Verfahren und Vorrichtung zum Veredeln einer Papierbahn - Google Patents

Verfahren und Vorrichtung zum Veredeln einer Papierbahn Download PDF

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Publication number
EP0648893B1
EP0648893B1 EP94112691A EP94112691A EP0648893B1 EP 0648893 B1 EP0648893 B1 EP 0648893B1 EP 94112691 A EP94112691 A EP 94112691A EP 94112691 A EP94112691 A EP 94112691A EP 0648893 B1 EP0648893 B1 EP 0648893B1
Authority
EP
European Patent Office
Prior art keywords
drying
nip
paper web
web
nips
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
EP94112691A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0648893A1 (de
Inventor
Reinhard Leigraf
Hans-Rolf Conrad
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 Sulzer Finishing GmbH
Original Assignee
Voith Sulzer Finishing 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 Voith Sulzer Finishing GmbH filed Critical Voith Sulzer Finishing GmbH
Publication of EP0648893A1 publication Critical patent/EP0648893A1/de
Application granted granted Critical
Publication of EP0648893B1 publication Critical patent/EP0648893B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • 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 finishing a paper web according to the preamble of claim 1 and an apparatus for carrying out the method according to the preamble of claim 7.
  • the invention has for its object to further increase the achievable smoothness of the paper web or to reduce the compression.
  • drying does not take place as post-drying, but rather as intermediate drying, eliminates the disadvantages associated with drying, namely re-erection of the paper fibers, i.e. a reduction in the gloss and smoothness of the paper, by at least one more pressing in the nip.
  • the improvement in smoothness in the subsequent nip is less than in the case of higher moisture.
  • the paper has a higher overall smoothness.
  • a desired property profile can also be obtained across the web width. Deviations from such a target profile are compensated for by appropriate control of the individual drying zones.
  • the control or regulation can take place not only depending on the moisture, but also depending on the gloss or smoothness, because these properties depend on the moisture in the downstream nip.
  • the suction device ensures that the steam produced during drying does not subsequently precipitate as condensate on the paper web and thus prevents the desired properties from occurring.
  • the embodiment according to claim 12 has the advantage that the highest line pressure prevails in the lowest nip and therefore the reduction in moisture due to the upstream drying device results in only a slight loss of smoothness.
  • the embodiment according to claim 13 leads to the paper web remaining in the free atmosphere for a predetermined time after drying, so that the heated paper web can be further evaporated before the last nip is reached.
  • a paper web 1 to be finished is removed from an unwinding roll 2, passed through a satin calender 3 and a drying device 4 and taken up by a winding roll 5.
  • the satin calender 3 has a stack of hard rollers 6, for example made of steel, and of soft rollers 7, which are provided with a cover, for example of asbestos substitutes. Gaps 8 are formed between the rollers, through which the paper web 1 is guided with the aid of guide rollers 9.
  • the paper web 1 emerges approximately horizontally from the second lowest nip 8a and passes through the drying device 4 with a horizontal section 1a. After deflection, a second horizontal section 1b of the paper web 1 leads to the lowest roller gap 8b.
  • the finished paper web 1 passes through a measuring station 10, which measures a web property, such as moisture, gloss and / or smoothness, with a sensor 11, which can be moved back and forth across the width of the paper web 1, and sends it to an actual value input 12 Controller 13 conducts.
  • a web property such as moisture, gloss and / or smoothness
  • Controller 13 conducts.
  • the property profile desired across the web width is entered via a setpoint input 14.
  • Corresponding control signals for the drying device 4 are emitted at the output 15.
  • the drying device has a plurality of drying elements 16 arranged next to one another, the drying performance of which can be controlled independently of one another. You can therefore dry some web sections more than others and therefore change the moisture profile or the gloss and smoothness values that depend on it.
  • the drying device 4 has a suction device 17 in order to remove the steam formed during drying. Drying can be carried out by blowing with hot air, by infrared radiation heating, by heat conduction by means of heated cylinders or in another known manner.
  • a further improvement results if at least some of the hard rollers 6 are heated and / or if the cover of the soft rollers 7 heats up due to the constant elastic deformation, that is to say the paper web 1 apart from the high one Humidity also assumes a higher temperature.
  • the drying device 4 lowers the high humidity to approximately the desired final value, for example to 5%, although the fibers on the surface partially straighten up. For this reason, pressure treatment is carried out again in the lowest nip 8b. This happens when the humidity is reduced, which is enough to produce the desired high smoothness.
  • the paper can also be treated in several successive compact calenders, with the drying device again being arranged at the end of the treatment section, but in any case before the last nip.

Landscapes

  • Paper (AREA)
  • Replacement Of Web Rolls (AREA)
  • Drying Of Solid Materials (AREA)
EP94112691A 1993-10-14 1994-08-13 Verfahren und Vorrichtung zum Veredeln einer Papierbahn Expired - Lifetime EP0648893B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4335053 1993-10-14
DE4335053A DE4335053A1 (de) 1993-10-14 1993-10-14 Verfahren und Vorrichtung zum Veredeln einer Papierbahn

Publications (2)

Publication Number Publication Date
EP0648893A1 EP0648893A1 (de) 1995-04-19
EP0648893B1 true EP0648893B1 (de) 1996-07-03

Family

ID=6500152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94112691A Expired - Lifetime EP0648893B1 (de) 1993-10-14 1994-08-13 Verfahren und Vorrichtung zum Veredeln einer Papierbahn

Country Status (6)

Country Link
EP (1) EP0648893B1 (fi)
JP (1) JPH07150498A (fi)
AT (1) ATE140047T1 (fi)
CA (1) CA2132648A1 (fi)
DE (2) DE4335053A1 (fi)
FI (1) FI944799A (fi)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5943787A (en) * 1997-03-03 1999-08-31 Valmet Corporation Web finishing section in a paper machine
US6076281A (en) * 1997-03-03 2000-06-20 Valmet Corporation Web finishing section in a paper machine
FI102093B (fi) * 1997-03-03 1998-10-15 Valmet Corp Rainan viimeistelyosa paperikoneessa
US7086525B2 (en) 1999-09-23 2006-08-08 Stewart Systems, Inc. Conveyor for continuous proofing and baking apparatus

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE94232C (fi) *
GB960933A (en) * 1962-01-22 1964-06-17 Clupak Inc Glazed uncreped extensible paper
US3647618A (en) * 1969-08-18 1972-03-07 Crown Zellerbach Corp Method and apparatus for improving formation uniformity of paper
DE3427967C2 (de) * 1984-07-28 1986-07-24 Kämmerer GmbH, 4500 Osnabrück Verfahren zum Veredeln von Papier und Vorrichtung zur Durchführung des Verfahrens
JP2646428B2 (ja) * 1986-03-10 1997-08-27 コンソリデイテイド―バサースト インコーポレイテッド 製紙方法
JPH01183595A (ja) * 1988-01-11 1989-07-21 Mitsubishi Paper Mills Ltd コーテッド紙のスーパーカレンダー処理方法
JPH01183592A (ja) * 1988-01-18 1989-07-21 Mitsubishi Heavy Ind Ltd ドライヤの水分プロファイルコントロール装置
US5045342A (en) * 1989-01-27 1991-09-03 Measurex Corporation Independent heat moisture control system for gloss optimization
JPH02264095A (ja) * 1989-04-04 1990-10-26 Ebara Corp 抄紙機ドライヤ用フード設備
JPH03120539A (ja) * 1989-10-03 1991-05-22 Fuji Photo Film Co Ltd 写真印画紙用支持体
DE4023871A1 (de) * 1990-07-27 1992-02-06 Voith Gmbh J M Vorrichtung zum abfuehren von kondensat aus einem mit dampf beheizten trockenzylinder
DE4126233C1 (fi) * 1991-08-08 1992-09-17 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De

Also Published As

Publication number Publication date
DE59400398D1 (de) 1996-08-08
ATE140047T1 (de) 1996-07-15
EP0648893A1 (de) 1995-04-19
CA2132648A1 (en) 1995-04-15
JPH07150498A (ja) 1995-06-13
FI944799A (fi) 1995-04-15
FI944799A0 (fi) 1994-10-12
DE4335053A1 (de) 1995-04-20

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