EP0628659B1 - Stabrakelstreichmaschine und ein Verfahren zum Säubern einer darin enthaltener Stabeshalterung - Google Patents

Stabrakelstreichmaschine und ein Verfahren zum Säubern einer darin enthaltener Stabeshalterung Download PDF

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Publication number
EP0628659B1
EP0628659B1 EP94850096A EP94850096A EP0628659B1 EP 0628659 B1 EP0628659 B1 EP 0628659B1 EP 94850096 A EP94850096 A EP 94850096A EP 94850096 A EP94850096 A EP 94850096A EP 0628659 B1 EP0628659 B1 EP 0628659B1
Authority
EP
European Patent Office
Prior art keywords
water
bar
cradle
coating
water groove
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
EP94850096A
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English (en)
French (fr)
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EP0628659A1 (de
Inventor
Rauno Rantanen
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 Oy
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Filing date
Publication date
Application filed by Valmet Oy filed Critical Valmet Oy
Publication of EP0628659A1 publication Critical patent/EP0628659A1/de
Application granted granted Critical
Publication of EP0628659B1 publication Critical patent/EP0628659B1/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
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod

Definitions

  • the invention concerns a method for keeping the coating-bar cradle in a bar coater clean in a bar coater in which the coating bar is substantially over its entire length supported revolvingly in a bar cradle fixed to the frame of the coater, which cradle is provided with one or several water grooves substantially parallel to the coating bar and open towards said coating bar.
  • the invention also concerns a bar coater in which the coating bar is substantially over its entire length supported revolvingly in a cradle fixed to the frame of the coater, which cradle is provided with at least one water groove substantially parallel to the coating bar and open towards said coating bar.
  • Bar coaters are used in the coating of paper in particular in cases in which it is feared that the coating blade in a blade coater produces streaks in the paper face. At present, especially in size presses, bar coaters have proved very good and usable, because by their means the size film can be metered well onto the roll faces in the size press.
  • the coating bars in bar coaters may be either grooved or smooth-faced.
  • a coating bar is, as a rule, rotated in the sense opposite to the running direction of the web, the object of said rotation being complete elimination of said streaks occasionally associated with the use of blade coaters.
  • the speed of rotation of the bar is, as a rule, 10...600 revolutions per minute.
  • the coating bars are provided with a suitable drive gear to rotate the bar, and in wide machines the bars are usually provided with drives at both ends of the bar so as to avoid torsional oscillations.
  • the coating process itself can be arranged, for example, so that the coating agent is applied to the web face by means of an applicator roll, and any excessive coating agent is doctored off the web face by means of the coating bar.
  • a bar coater may also be constructed as a so-called short-dwell unit, in which the coating agent is introduced into a coating-agent chamber, which is defined by the front wall of the chamber and, on the other hand, by the coating bar and by the base to be coated itself, which base may be the face of a size-press roll, the face of a back-up roll, the paper web, or equivalent.
  • the coating bar is mounted as revolving in a cradle made of a suitable material, for example polyurethane.
  • the bar is normally supported in said cradle over its entire length.
  • a water groove or water grooves is/are provided, the water circulating in said groove(s) being supposed to lubricate, to cleanse, and to cool or to heat the coating bar.
  • the number of the water grooves is usually one or two.
  • a substantial problem in bar coaters is blocking of the water groove by size or pigment-coating paste. On occurrence of blocking, the cooling, washing and lubricating effect of water is discontinued, and at the same time the water penetrates onto the coating base.
  • the object of the present invention is to provide a method and a bar coater by whose means the drawbacks involved in the prior-art solutions are avoided.
  • the method of the present invention is mainly characterized in that at least one of the water grooves in the bar cradle is kept open constantly and forcibly by promoting the flow in the water groove by means of negative pressure connected to the outlet side of the water groove.
  • the bar coater in accordance with the invention is mainly characterized in that a vacuum pump is connected to the water groove to the side of the outlet flow of water, which pump is fitted to produce negative pressure in the water groove so as to promote the water flow and to prevent leakage of water out of the water groove.
  • Figure 1 is a schematic sectional side view of a bar coater.
  • Figures 2 and 3 are fully schematic illustrations of alternative solutions for keeping the water groove in the coating-bar cradle in a bar coater as shown in Fig. 1 clean.
  • the coating device is denoted generally with the reference numeral 10.
  • the coating device 10 is a bar coater, whose coating bar 13 is, in the embodiment of Fig. 1, arranged against the paper or board web W running on the face of the back-up roll 14.
  • the coating device 10 of the embodiment as shown in Fig. 1 is a coating device of the so-called short-dwell type, in which the coating agent is introduced into a coating-agent chamber 11 placed before the coating bar 13, in the running direction of the web W, which chamber 11 is, besides by said coating bar 13, also defined by the web W, by the front wall 12 of the coating-agent chamber, and by lateral seals (not shown).
  • the coating-agent chamber 11 is pressurized, and overflow of the coating agent is arranged out of the chamber 11 through the gap 15 between the front wall of the coating-agent chamber and the web W.
  • the coating bar 13 is fitted revolvingly in a cradle 18 made of a suitable material, for example polyurethane, which cradle supports the coating bar 13 over its entire length.
  • the coating bar 13 is provided with a purposeful drive gear (not shown), by whose means the coating bar 13 is rotated in the sense opposite to the running direction of the web W.
  • the cradle 18 of the coating bar 13 is fitted in a support 16, and both the cradle 18 and the support 16 are together attached to a holder 19 mounted on the frame of the coating device 10.
  • a loading hose 17 is fitted, by whose means the coating bar 13 can be loaded in the desired way against the web W.
  • water grooves 5,6 have been formed, which are in connection with the coating bar 13 and which are open towards the coating bar 13, the water circulating in said grooves being supposed to lubricate, to cleanse, and to cool the coating bar 13.
  • Fig. 2 is a fully schematic illustration in the machine direction of a part of the cradle 18 of the coating bar and of a bar coater in accordance with the invention connected with the cradle.
  • Fig. 2 is a fully schematic illustration in the machine direction of a part of the cradle 18 of the coating bar and of a bar coater in accordance with the invention connected with the cradle.
  • the keeping of the water groove 5 in the bar cradle 18 open has been accomplished so that, in one end of the water groove 5, means have been provided for feeding water into the water groove 5, and to the opposite end of the water groove 5, at the outlet side of the water, means have been connected by which the water is sucked out of the water groove 5 by means of negative pressure.
  • the means for feeding the water into the water groove 5 comprise a tank 21, which communicates with the water groove 5 through the duct 20.
  • the tank 21 is placed at a level higher than the water groove 5, so that the water w contained in the tank 21 is carried into the water groove 5 by the effect of hydrostatic pressure.
  • the duct 20 may be provided with a valve 22, by whose means the flow of water w into the water groove 5 can be regulated.
  • the feed of water into the water groove 5 can also be arranged from a pressure water network (not shown), from which the desired flow quantity can be taken by means of a valve.
  • a vacuum pump 24 has been connected to the water groove 5 to the outlet side of water by means of the duct 23, water being sucked out of the water groove 5 by means of the negative pressure produced by said vacuum pump.
  • the vacuum pump 24 produces a negative pressure in the water groove 5, which negative pressure prevents leakage of water w out of the water groove 5 between the coating bar 13 and the sealing lip of the bar cradle 18.
  • the vacuum pump 24 it is also possible to regulate the water w flow in the water groove 5 by adjusting the negative pressure produced by the vacuum pump 24. It is also possible to suck water out of the water groove 5 by means of hydrostatic negative pressure.
  • Fig. 3 shows an alternative embodiment of the solution in accordance with the invention.
  • the means shown in Fig. 2 for the feed and removal of water, which were fitted at opposite ends of the water groove 5 in the illustration in Fig. 2 have been substituted for by a number of feed ducts 26,27 and outlet ducts 29,30 placed in the longitudinal direction of the bar cradle 18a, i.e. in the transverse direction of the machine.
  • the feed ducts 26,27 passing into the water groove 5a communicate with a common water supply duct 25, and correspondingly the outlet ducts 29,30 passing out of the water groove 5a communicate with a common outlet duct 28.
  • a common outlet duct 28 Even though it is not illustrated in Fig.
  • the outlet duct 28 is additionally connected, for example, with a vacuum pump 24 similar to that shown in Fig. 2, water being sucked out of the water groove 5a by means of the negative pressure produced by said pump.
  • a vacuum pump 24 similar to that shown in Fig. 2, water being sucked out of the water groove 5a by means of the negative pressure produced by said pump.
  • the water groove 5a may be divided into separate compartments by means of partition walls 31, the water being fed into each of said compartments through separate feed ducts, and the water being sucked out of said compartments through separate outlet ducts.
  • Fig. 3 shows just a small portion of a bar cradle 18a, but it is understood that, in the water groove 5a, over the length of the bar cradle 18a, there may be several compartments separated by partition walls 31.
  • compartments can be accomplished, for example, so that the water groove 5a is divided into two parts by means of a partition wall 31 fitted in the middle in the transverse direction of the machine, in which case, the supply of water into, and its removal out of, these compartments can take place in the transverse direction of the machine from opposite ends of the bar cradle 18a.
  • the cleansing of the water groove 5,5a can be intensified further so that, at the same time, for example, an agent is fed into the water groove that lowers the friction or promotes the keeping of the groove clean.
  • the cleaning of the water groove 5,5a can also be carried out by just feeding water, size or paste alone into the water groove 5,5a.
  • the water groove 5,5a is kept open and clean constantly and forcibly by means of negative pressure produced into the groove.
  • the water may also have a function of cooling the coating bar 13 and the cradle 18,18a.
  • a high temperature of water is advantageous because of lower resistance to flow.
  • certain coating agent qualities require a certain level of temperature, in which case a high temperature of water may contribute to prevention of solidification and clogging of the coating agent.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Claims (7)

  1. Verfahren zum Säubern der Streichstabrakelhalterung in einer Stabrakelstreichmaschine (10), in welcher die Streichstabrakel (13) im wesentlichen über ihre gesamte Länge drehbar in einer Stabrakelhalterung (18, 18a) gestützt ist, die an den Rahmen der Streichmaschine (10) befestigt ist, wobei die Halterung mit einer oder mehreren im wesentlichen zur Streichstabrakel (13) parallelen und in Richtung auf die Streichstabrakel offenen Wassernuten (5, 5a) versehen ist, dadurch gekennzeichnet, daß zumindest eine der Wassernuten (5, 5a) in der Stabrakelhalterung (18, 18a) dadurch konstant und zwangsweise offen gehalten wird, daß die Strömung in der Wassernut (5, 5a) mittels Unterdruck gefördert wird, der an der Abflußseite der Wassernut angeschlossen wird.
  2. Verfahren gemäß Patentanspruch 1, dadurch gekennzeichnet, daß Wasser von einem oder mehreren Punkten in der Längsrichtung der Stabrakelhalterung (18, 18a) in die Wassernut (5, 5a) gespeist und entsprechend Wasser von einem oder mehreren Punkten in der Längsrichtung der Stabrakelhalterung (18, 18a) mittels Unterdruck aus der Wassernut (5, 5a) abgezogen wird.
  3. Verfahren gemäß Patentanspruch 2, dadurch gekennzeichnet, daß die Wassernut (5a) in der Längsrichtung der Stabrakelhalterung (18a) durch Trennwände (31) oder dergleichen in separate Zonen unterteilt wird, wobei Wasser durch separate Zufluß- und Abflußkanäle (26, 27, 29, 30) in die Zonen gespeist und aus den Zonen abgezogen wird, in welchem Fall die Strömung in jeder Zone frei von jeglicher Störung ist, die möglicherweise durch die durch die anderen Zonen stattfindenden Strömungen verursacht werden kann.
  4. Verfahren gemäß einem der vorangegangenen Patentansprüche, dadurch gekennzeichnet, daß der Unterdruck in der Wassernut (5, 5a) mittels einer oder mehrerer Unterdruckpumpen (24) erzeugt wird, die an der Abflußseite mit dem Kanal/den Kanälen (23, 29, 30) verbunden sind.
  5. Stabrakelstreichmaschine (10), in welcher die Streichstabrakel (13) im wesentlichen über ihre gesamte Länge in einer Halterung (18, 18a) drehbar abgestützt ist, die an den Rahmen der Streichmaschine (10) befestigt ist, wobei die Halterung mit zumindest einer Wassernut (5, 5a, 6) versehen ist, die im wesentlichen zur Streichstabrakel (13) parallel und zur Streichstabrakel (13) hin offen ist, dadurch gekennzeichnet, daß eine Unterdruckpumpe (24) an der Seite der Wasserabflußströmung an der Wassernut (5, 5a) angeschlossen ist, wobei die Pumpe in der Wassernut (5, 5a) Unterdruck erzeugen kann, so daß die Wasserströmung gefördert und der Austritt von Wasser aus der Wassernut (5, 5a) verhindert wird.
  6. Stabrakelstreichmaschine gemäß Patentanspruch 5, dadurch gekennzeichnet, daß der Zufluß von Wasser in die Wassernut (5, 5a) von einem oder mehreren Punkten in der Längsrichtung der Stabrakelhalterung (18, 18a) eingerichtet ist, und entsprechend der Abzug von Wasser aus der Wassernut (5, 5a) von einem oder mehreren Punkten in der Längsrichtung der Stabrakelhalterung (18, 18a) eingerichtet ist, wobei jeder Abflußkanal (29, 30) mit einer Unterdruckquelle (24) in Verbindung steht.
  7. Stabrakelstreichmaschine gemäß Patentanspruch 6, dadurch gekennzeichnet, daß die Wassernut (5a) durch Trennwände (31) in zwei oder mehrere Zonen unterteilt ist, wobei jede der Zonen mit einem Wasserzufluß und mit einem Wasserabzug versehen ist, der mittels Unterdruck stattfindet.
EP94850096A 1993-06-07 1994-06-06 Stabrakelstreichmaschine und ein Verfahren zum Säubern einer darin enthaltener Stabeshalterung Expired - Lifetime EP0628659B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI932589A FI93521C (fi) 1993-06-07 1993-06-07 Menetelmä ja laitteisto sauvapäällystimen päällystyssauvan kehdon puhtaana pitämiseksi
FI932589 1993-06-07

Publications (2)

Publication Number Publication Date
EP0628659A1 EP0628659A1 (de) 1994-12-14
EP0628659B1 true EP0628659B1 (de) 1996-12-27

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ID=8538085

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Application Number Title Priority Date Filing Date
EP94850096A Expired - Lifetime EP0628659B1 (de) 1993-06-07 1994-06-06 Stabrakelstreichmaschine und ein Verfahren zum Säubern einer darin enthaltener Stabeshalterung

Country Status (5)

Country Link
EP (1) EP0628659B1 (de)
AT (1) ATE146835T1 (de)
CA (1) CA2125198A1 (de)
DE (1) DE69401242T2 (de)
FI (1) FI93521C (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245582A (en) * 1979-02-02 1981-01-20 Beloit Corporation Adjustable rod holder for metering rod coaters
US4258650A (en) * 1979-09-19 1981-03-31 Mccrocklin Teddy A Rod holder for coating doctor system

Also Published As

Publication number Publication date
EP0628659A1 (de) 1994-12-14
ATE146835T1 (de) 1997-01-15
FI93521C (fi) 1995-04-25
DE69401242D1 (de) 1997-02-06
FI93521B (fi) 1995-01-13
CA2125198A1 (en) 1994-12-08
DE69401242T2 (de) 1997-04-30
FI932589A0 (fi) 1993-06-07

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