EP0608206B1 - Leimpresse - Google Patents

Leimpresse Download PDF

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Publication number
EP0608206B1
EP0608206B1 EP94850012A EP94850012A EP0608206B1 EP 0608206 B1 EP0608206 B1 EP 0608206B1 EP 94850012 A EP94850012 A EP 94850012A EP 94850012 A EP94850012 A EP 94850012A EP 0608206 B1 EP0608206 B1 EP 0608206B1
Authority
EP
European Patent Office
Prior art keywords
nip
size
roll
press
web
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
EP94850012A
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English (en)
French (fr)
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EP0608206A1 (de
Inventor
Ville Korhonen
Pekka Laitinen
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 Oy
Original Assignee
Valmet Oy
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8536867&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0608206(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Valmet Oy filed Critical Valmet Oy
Publication of EP0608206A1 publication Critical patent/EP0608206A1/de
Application granted granted Critical
Publication of EP0608206B1 publication Critical patent/EP0608206B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls

Definitions

  • the invention concerns a size press, comprising a first roll, which is mounted rigidly on the frame of the size press, as well as a second roll, which forms a size-press nip with the first roll and which is mounted, at a level higher than the level of said first roll, on a loading arm that is supported pivotally on a transverse shaft on the frame of the size press, said rolls that form the size-press nip being provided with coating devices of the Short Dwell type for spreading of films of coating agent onto the faces of said rolls, the coating agent being arranged to adhere, in the nip, from said roll faces onto the paper web or equivalent that passes through the nip, said loading arm being pivotal by means of loading cylinders so as to produce the desired pressure level in the nip and to open said nip for threading of the web and for replacement of rolls, and the paper web or equivalent being passed into the nip as guided by a guide roll and out of the nip over a spreader roll or an air-turning device
  • the surface-treatment device most commonly used in surface sizing is a size press.
  • the size press comprises size-press rolls, which are mounted in the conventional way on the frame of the press and which form a nip with one another, the paper web being passed through said nip. It is a conventional mode of adding size to the paper face that a size pond is arranged in the gap placed before the nip formed by the roll, the paper web running through said pond.
  • each roll in the size press is provided with a coating device, e.g. as described in DE-C-427 531 or preferably of the Short Dwell type, which devices spread and smooth the size films or equivalent onto the roll faces, said films being then transferred to the paper web to be treated in the roll nip.
  • a coating device e.g. as described in DE-C-427 531 or preferably of the Short Dwell type, which devices spread and smooth the size films or equivalent onto the roll faces, said films being then transferred to the paper web to be treated in the roll nip.
  • such film-size presses may also be used for pigmenting of paper.
  • the lower one of the size-press rolls is mounted on the size-press frame stationarily, whereas the other one, i.e. the upper size-press roll, is mounted on a particular loading arm, which is again linked pivotally on the frame of the size press.
  • loading cylinders are fitted, by whose means the desired nip pressure can be produced in the size-press nip and by means of which cylinders the nip can be opened for tail threading of the web and further for replacement of roll.
  • the size-press rolls were usually arranged so that the plane that passes through the axes of the rolls, i.e. the nip plane, is substantially horizontal or just very slightly inclined from the horizontal plane. This is also understandable, because by means of such an arrangement it was possible to form a suitable size pond in the gap placed before the roll nip.
  • the film size presses that have been developed further from these size presses operating with the size-pond principle and in which the size-press rolls are provided with particular coating devices, have substantially equal basic constructions in the conventional technology.
  • the size-press rolls have been arranged so that the angle between the rolls, i.e. the angle of the nip plane in relation to the horizontal plane, is very little, as a rule of an order of 15...30°.
  • One such solution is described, e.g., in the applicant's FI-A-87,475 of earlier date.
  • the paper guide roll over which the web is passed into the nip is arranged above the lower size-press roll, being attached to a pivot arm, which is linked pivotally on the frame of the size press by means of a transverse pivot shaft so that, for replacement of roll, the paper guide roll can be pivoted into a position that has been shifted aside from the running position.
  • a pivot arm which is linked pivotally on the frame of the size press by means of a transverse pivot shaft so that, for replacement of roll, the paper guide roll can be pivoted into a position that has been shifted aside from the running position.
  • the paper guide roll has, however, been attached to a frame of its own, which has been separate from the frame of the size-press rolls. Owing to the relative location of the size-press rolls, it has been necessary to construct the frame of the paper guide roll quite massive, because it has been necessary to support the paper guide roll above the size press. It has been necessary to do this in order that it should be possible to make the web pass into the nip as precisely parallel to the tangent of each press roll as possible. In such a solution, it has not been possible to attach the paper guide roll to its frame directly, but, as a rule, it has been attached by means of an articulated pivot arm linked to the frame construction in order that it should be possible to lift said guide roll out of the way in connection with replacement of press rolls.
  • the size-press rolls have been of different hardness, i.e. the lower size-press roll and the upper size-press roll have been provided with coatings of different hardness.
  • the upper size-press roll has been harder than the lower roll.
  • the object of the present invention is to provide a size press by whose means the drawbacks involved in the prior-art constructions are avoided and by whose means, further, the coating result can be improved over the prior-art solutions.
  • the invention as described in claim 1 is mainly characterized in that the rolls that form the size-press nip have been arranged in such a way in relation to one another that the nip plane passing through the rolls forms an angle of 35...120°, preferably 50...60°, in relation to the horizontal plane, and that the web has been arranged to be passed into the nip at an angle of substantially 90° in relation to the nip plane and to be passed out of the nip at an angle of substantially 90° in relation to the nip plane.
  • the running line of the web can be made very smooth, which results in easy tail threading and good runnability of the web.
  • the web can be separated from the nip at an angle of 90° without any extra support members, such as air-blow boxes or equivalent. In connection with the invention, it is, however, possible to use such support members if they are considered necessary.
  • the quality of the coating can be made very good.
  • a size press in accordance with the invention it is possible to use rolls of equal hardness, unlike the prior-art solutions, in which one-sided separation of the web requires rolls of different hardness.
  • a lower number of spare rolls are needed than in the prior art.
  • the invention permits the paper guide roll that precedes the nip to be mounted on a separate, stationary frame so that it does, however, not hamper the replacement of the nip rolls in any way.
  • Figure 1 is a fully schematic side view of a size press in accordance with the invention.
  • Figure 2 is a schematic sectional view of a coating device of the Short Dwell type used in a size press in accordance with the invention.
  • Figure 3 is a schematic illustration of the running of the web line in a size press in accordance with the invention.
  • Figure 4 is an illustration corresponding to Fig. 1 of a size press in which contact-free dryers have been fitted in the path of the web coming out of the dryer before the drying cylinder.
  • Figure 5 is a schematic illustration of a solution in which the turning, spreading, and guiding of the web after the nip are arranged by means of air-turning devices.
  • the size press is denoted generally with the reference numeral 10.
  • the size press 10 comprises a size-press frame 11, which is mounted on a base B and on which the size-press rolls 12,16 are mounted in the conventional way.
  • the bearing housing 13 of the first size-press roll 12, i.e. of the lower roll, is mounted directly on the frame 11 of the size press and attached to it rigidly.
  • the bearing housing 17 of the second size-press roll, i.e. of the upper roll is mounted on a loading arm 19, which is linked pivotally to the size-press frame 11 by means of a pivot shaft 20 transverse to the machine direction.
  • loading cylinders 22 are fitted, by whose means the loading arm 19 is loaded so as to produce a nip pressure of the desired magnitude in the nip N formed by the lower roll 12 and the upper roll 16.
  • Either one of the size-press rolls 12,16, preferably the upper roll 16, or alternatively both of the size press rolls 12,16, may be variable-crown rolls in order that the nip N pressure could be brought to the desired level in the transverse direction of the machine.
  • Each size-press roll 12,16 is provided with a coating device 15,21 of the Short Dwell type, by whose means the size films or equivalent coating-agent films are applied and smoothed onto the faces 14,18 of said rolls.
  • the films of coating agent are transferred from the roll 12,16 faces 14,18 to the web W'.
  • the web W is passed into the size-press nip N over the guide roll 23, which is mounted on a stationary frame 24 which has been installed on the base B.
  • the web W' is passed over the spreader roll 25 further to the dryer section, whose first drying cylinder is denoted with the reference numeral 26.
  • the construction and the operation of the coating devices 15,21 of the Short Dwell type are described in more detail in the description related to Fig. 2.
  • the means of support of the spreader roll 25 are not described in more detail in this connection.
  • Fig. 2 is a more detailed schematic sectional view of the construction of a coating device of the Short Dwell type used in a size press in accordance with the invention.
  • Fig. 2 specifically shows the coating device 15 of the Short Dwell type placed in connection with the first size-press roll 12 in the size press 10, but it is fully obvious that the coating device 21 placed in connection with the second size-press roll 16 may have a construction of a corresponding type.
  • the application of the coating-agent film onto the face 14 of the roll 12 is carried out so that, in the coating device 15, the coating agent is supplied under pressure into the coating-agent chamber 153, which is defined by the coating member 151, by the front edge 152 of the coating-agent chamber 153, by the face 14 of the size-press roll, and by lateral seals (not shown).
  • the front edge 152 of the pressurized coating-agent chamber 153 may be similar to that shown in Fig.
  • the coating member that is used is a coating bar 151, which is mounted rotatably in a bar cradle 154, which is made of, e.g., polyurethane or of an equivalent material.
  • the bar cradle 154 is mounted in its holder 155, in which it is secured in its position by means of a fastening device 156.
  • a profile rib 158 is fitted, which rests against the rear face of the bar cradle 154 by the intermediate of a loading hose 157.
  • adjusting spindles 159 have been fixed by means of suitable fixing means (not shown), a number of such spindles being fitted as uniformly spaced in the transverse direction of the machine.
  • spindle motors (not shown) are mounted, by whose means, by displacing the adjusting spindles 159, the profile bar 158 is pulled and/or pushed so that the profile bar 158 can be deflected in the desired way.
  • the coating device 15 as shown in Fig. 2 is provided with a coating-agent supply pipe 161 transverse to the machine direction, into which pipe the coating agent is supplied from one end or, preferably, from both ends of said supply pipe 161.
  • the supply pipe 161 is provided with a great number of holes or equivalent nozzles 162 in the transverse direction of the machine, said holes or nozzles forming a throttle for the flow of the coating agent.
  • the coating agent is passed out of the supply pipe 161 through the nozzles 162 into the coating-agent chamber 153.
  • the front edge 152 of the coating-agent chamber 153 is installed in its holder 160 in the normal way.
  • a coating device 15 of the Short Dwell type used in a size press 10 in accordance with the invention.
  • Other constructions of the coating device may show even considerable variation within the scope of the invention, but it is an essential feature of the coating devices 15 of the Short Dwell type that the device comprises a pressurized coating-agent chamber 153, which is defined by the coating member 151, by the front edge 152 of the coating-agent chamber, by the roll face 14, and by lateral seals (not shown).
  • the size-press rolls 12,16 are mounted in the size press in a way different from the conventional arrangement, so that the angle ⁇ of the nip plane T-T, which runs through the central axes of the size-press rolls 12,16, in relation to the horizontal plane S is substantially larger than in the prior-art solutions.
  • said angle ⁇ is 35...120°, advantageously 50...60°, preferably 55°.
  • the web W is passed into the nip N as guided by the guide roll 23, so that the web W is guided into the nip N as precisely parallel to the tangent of each press roll 12,16 as possible.
  • the inlet angle of the web running line in relation to the nip plane is, in Fig. 3, denoted with the reference denotation ⁇ 1 .
  • the coated web W' is passed, in the embodiment of Fig. 3, from the nip N over the spreader roll 25 to further processing, as was already stated above.
  • this objective has been achieved so that the coated web W' can be passed out of the nip N at an angle ⁇ 2 , which is 90 ⁇ 7°.
  • the variation in the outlet angle ⁇ 2 of the web line has been produced thereby that the position of the spreader roll 25 is adjustable in the vertical direction.
  • This adjustability can be arranged in a simple way by conventional means.
  • Such a need of adjustment may arise, for example, when the properties of the upper face and the lower face of the web W to be coated differ from one another, e.g., in respect of porosity or smoothness.
  • Such properties of the web W affect the adhesion between the web W and the roll 12,16 faces 14,18.
  • the size press 10 shown in Fig. 4 is similar to that already described in connection with Fig. 1.
  • the embodiment shown in Fig. 4 differs from that shown in Fig. 1 so that the web W' is passed from the size-press nip N onto the first drying cylinder 26 in the dryer section so that the web W' is dried, after the spreader roll 35 by means of contact-free dryers 36,37 before the web W' is passed onto the drying cylinder 26.
  • Such contact-free dryers suitable for the purpose are, for example, convection dryers, infrared dryers and/or air dryers, such as hot-air blow dryers.
  • Such contact-free web W' dryers 36,37 are advantageous and necessary especially when large coating quantities are run into the web W' by means of the size press 10.
  • FIG. 5 differs from that shown in Fig. 4 in the respect that, in the embodiment of Fig. 5, the spreader roll 35 as shown in Fig. 4 has been completely substituted for by air-turning devices 38a,38b, by whose means the web W' is turned and guided onto the first drying cylinder 26 in the dryer section.
  • air blows coming out of blow boxes 38c,38d or out of equivalent air-turning devices have been arranged to support the web W'.
  • rolls of equal hardness can be used as the upper and lower rolls 12,16.
  • the rolls 12,16 can be provided with identical coatings, in which case an equally high number of spare rolls are not needed as were needed in the prior art.
  • Replacement of the rolls 12,16 can also be carried out in a simple way in a size press 10 in accordance with the invention. As can be seen in particular from Figs. 1, 4 and 5, by pivoting the loading arm 19, the rolls 12,16 can be brought into such a roll replacement position in which the lower roll 12 can also be replaced readily even if the upper roll 16 were in its position.
  • the nip N is preferably constructed so that it is opened in two stages, so that, by means of the loading arm 19 and the loading cylinders 22, the upper roll 16 can be pivoted first into a normal tail threading position, in which the tail threading of the web W can be carried out very easily and simply because of the substantially straight web line. After the catches of the tail threading position (not shown) have been opened, the nip N can be opened to the roll replacement position.

Landscapes

  • Finger-Pressure Massage (AREA)
  • Paper (AREA)
  • Liquid Crystal (AREA)
  • Optical Head (AREA)
  • Glass Compositions (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Coating Apparatus (AREA)
  • Replacement Of Web Rolls (AREA)

Claims (7)

  1. Leimpresse mit einer ersten Walze (12), welche fest an den Rahmen (11) der Leimpresse montiert ist, sowie einer zweiten Walze (16), die mit der ersten Walze einen Leimpressenspalt (N) bildet und die auf einem Niveau, das höher als das Niveau der ersten Walze (12) ist, an einen Ladearm (19) montiert ist, der an einer Querwelle (20) an dem Rahmen (11) der Leimpresse schwenkbar abgestützt ist, wobei die, den Leimpressenspalt (N) bildenden Walzen (12, 16) mit Streichvorrichtungen (15, 21) der Bauart kurzer Verweilzeit versehen sind, um Streichmittelfilme auf die Flächen der Walzen (14, 18) zu verteilen, und für den Transfer des Streichmittels von den Walzenflächen auf die durch den Spalt gehende Papierbahn (W) oder dergleichen vorgesehen sind, wobei der Ladearm (19) mit Hilfe von Ladezylindern (22) schwenkbar ist, um in dem Spalt (N) die angestrebte Druckhöhe zu erzeugen und um den Spalt für das Aufführen der Bahn (W) und für den Walzenaustausch zu öffnen, wobei die Papierbahn (W) oder dergleichen, geleitet mittels einer Leitwalze (23), in den Spalt (N) eingeleitet und aus dem Spalt (N) über eine Verteilerwalze (25, 35) oder eine Luftablentvorrichtung (38, 38a, 38b, 38c, 38d) herausgeleitet wird, dadurch gekennzeichnet, daß die den Leimpressenspalt (N) bildenden Walzen (12, 16) in Bezug zueinander auf derartige Weise eingerichtet worden sind, daß die durch die Walzen gehende Spaltebene (T-T) in Bezug auf die horizontale Ebene (S) einen Winkel (α) von 35° bis 120°, vorzugsweise 50° bis 60°, bildet und daß die Leitwalze (23) und die Verteilerwalze (25, 35) oder die Luftablenkvorrichtung (38, 38a, 38b, 38c, 38d) 0 derart eingerichtet worden ist, daß die Bahn (W) in einem Winkel (β1) von im wesentlichen 90° in Bezug auf die Spaltebene (T-T) in den Spalt (N) einzuleiten ist und in einem, in Bezug auf die Spaltebene (T-T) uber und unter 90° einstellbaren Auslaßwinkel (β2) aus dem Spalt (N) herauszuleiten ist.
  2. Leimpresse gemäß Patentanspruch 1, dadurch gekennzeichnet, daß die Einstelltoleranz des Auslaßwinkels (β2) der Bahnlinie ± 7° beträgt.
  3. Leimpresse gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß in Hinblick auf das Einstellen des Auslaßwinkels (β2) der Bahnlinie die Verteilerwalze (25, 35) oder die Luftablenkvarrichtung (38a) derart eingerichtet worden ist, daß sie in der Vertikalrichtung einstellbar ist.
  4. Leimpresse gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß in dem Weg der von dem Leimpressenspalt (N) heraus kommenden Bahn (W') nach der verteilerwalze (25, 35) oder der Luftablenkvorrichtung (38a, 38b), vor dem ersten Trockenzylinder (26) in der Trocknerpartie, kontaktfreie Trockner (36, 37) für die Bahn (W') angebracht sind, wie etwa Konvektionstrockner, Infrarottrockner oder Heißluftgebläsetrockner.
  5. Leimpresse gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß der Winkel (α) der Spaltebene (T-T) in Bezug auf die horizontale Ebene (S) 55° beträgt.
  6. Leimpresse gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß die Leitwalze (23), über welche die Bahn (W) in den Spalt (N) geleitet wird, separat von dem Leimpressenrahmen (11) ortsfest an einen Rahmen (24) montiert worden ist.
  7. Leimpresse gemäß einem der vorhergehenden Patentansprüche, dadurch gekennzeichnet, daß die, den Leimpressenspalt (N) bildenden Walzen (12, 16) mit einer Beschichtung versehen sind, die an beiden Walzen von im wesentlichen gleicher Härte ist.
EP94850012A 1993-01-22 1994-01-21 Leimpresse Revoked EP0608206B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI930255 1993-01-22
FI930255A FI93044C (fi) 1993-01-22 1993-01-22 Liimapuristin

Publications (2)

Publication Number Publication Date
EP0608206A1 EP0608206A1 (de) 1994-07-27
EP0608206B1 true EP0608206B1 (de) 1996-08-14

Family

ID=8536867

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94850012A Revoked EP0608206B1 (de) 1993-01-22 1994-01-21 Leimpresse

Country Status (5)

Country Link
EP (1) EP0608206B1 (de)
AT (1) ATE141359T1 (de)
CA (1) CA2113940A1 (de)
DE (1) DE69400357T2 (de)
FI (1) FI93044C (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4431202A1 (de) * 1994-09-02 1996-03-07 Jagenberg Papiertech Gmbh Vorrichtung zum beidseitigen Beschichten einer Materialbahn
FI115543B (fi) 2000-06-20 2005-05-31 Metso Paper Inc Esikalanterointimenetelmä, jälkikäsittelymenetelmä ja laitteisto menetelmien toteuttamiseksi
US6634120B2 (en) 2001-03-26 2003-10-21 Voith Paper Patent Gmbh Apparatus for coating moving fiber webs
EP1245732B1 (de) * 2001-03-26 2007-07-18 Voith Patent GmbH Vorrichtung zur Beschichtung einer laufenden Bahn, insbesondere einer Papier- oder Kartonbahn
FI20045464A (fi) 2004-11-30 2006-05-31 Metso Paper Inc Menetelmä pintaliimatun paperin/kartongin valmistamiseksi
DE102008054948A1 (de) 2008-12-19 2010-07-01 Voith Patent Gmbh Auftragsvorrichtung
DE102011002671A1 (de) 2011-01-13 2012-07-19 Metso Paper, Inc. Leimmittelzuführsystem zum Zuführen von Leimmittel zu einer Papier- oder Kartonbahn
WO2013050821A1 (en) * 2011-04-04 2013-04-11 PMT Italia A size press apparatus
DE102012213026A1 (de) 2012-07-25 2014-01-30 Voith Patent Gmbh Auftragsvorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE427531C (de) * 1926-04-09 Bernhard Kremler Vorrichtung zum Leimen, Faerben und Traenken von Papierbahnen in und ausserhalb der Papiermaschine
US3379170A (en) * 1965-02-16 1968-04-23 Appleton Mach Liquid applicator
FI88063C (fi) * 1990-10-12 1993-03-25 Valmet Paper Machinery Inc Anordning foer dosering av bestrykningsmedel pao ett roerligt underlag

Also Published As

Publication number Publication date
FI930255A (fi) 1994-07-23
FI930255A0 (fi) 1993-01-22
EP0608206A1 (de) 1994-07-27
DE69400357D1 (de) 1996-09-19
ATE141359T1 (de) 1996-08-15
CA2113940A1 (en) 1994-07-23
DE69400357T2 (de) 1997-01-16
FI93044B (fi) 1994-10-31
FI93044C (fi) 1995-02-10

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