EP0536649A1 - Dispositif pour déposer une sauce d'enduction sur une bande fibreuse - Google Patents

Dispositif pour déposer une sauce d'enduction sur une bande fibreuse Download PDF

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Publication number
EP0536649A1
EP0536649A1 EP92116870A EP92116870A EP0536649A1 EP 0536649 A1 EP0536649 A1 EP 0536649A1 EP 92116870 A EP92116870 A EP 92116870A EP 92116870 A EP92116870 A EP 92116870A EP 0536649 A1 EP0536649 A1 EP 0536649A1
Authority
EP
European Patent Office
Prior art keywords
coating
distribution pipe
coating slip
nozzle chamber
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.)
Granted
Application number
EP92116870A
Other languages
German (de)
English (en)
Other versions
EP0536649B1 (fr
Inventor
Rudolf Beisswanger
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 claimed from DE19914133501 external-priority patent/DE4133501C2/de
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0536649A1 publication Critical patent/EP0536649A1/fr
Application granted granted Critical
Publication of EP0536649B1 publication Critical patent/EP0536649B1/fr
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
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • D21H23/36—Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade or short-dwell coaters

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • the liquid to be applied can be, for example, a glue suspension with which the paper web is impregnated; i.e. the glue suspension penetrates more or less completely into the interior of the paper web.
  • the liquid can also be a coating slip; This means a wide variety of pigment suspensions from which a cover layer is formed on the paper web. In both cases, the liquid can be applied to only one side of the paper web or to both sides of the paper web.
  • a decisive disruptive factor is always air that is in the coating slip. In any case, this air must be removed before the coating slip reaches the paper web. All possible ventilation measures are taken for this purpose. For example, a ventilation dome is placed on the distribution pipe, which extends over the entire length of the distribution pipe and is connected to the interior of the distribution pipe by further bores. Through these holes, a small partial stream, which is loaded to a greater extent with air bubbles, enters the aforementioned channel from the distribution pipe in order to be returned to the circuit.
  • the described principle of the known distribution pipe is problematic. It is difficult to ensure that the two partial flows of the coating slip actually reach a speed of zero in the central area.
  • the supply from both sides requires a certain amount of equipment. Since the recirculation flow that flows through the vent dome is only small in size, the speed is also slow. This leads to deposits, even in the bores between the distribution pipe and the vent dome.
  • the distribution itself is also not optimal, specifically because of the speed reduction of the partial flows on the way between the entry into the distribution pipe and the central region of the length of the distribution pipe.
  • the invention relates to a coating device according to document (1).
  • the invention has for its object to design such a device such that the coating slip is distributed as evenly as possible over the length of the distribution tube and thus over the width of the paper web, that the venting problem is solved properly, that deposits are avoided, and that the apparatus Effort is reduced.
  • the invention achieves the following in detail:
  • the coating slip is now passed through the entire length of the distribution pipe, from one end to the other, without a state of rest.
  • the coating slip is therefore always in motion along the entire length of the pipe.
  • the more airy part is on this flow path - seen in cross section through the distribution pipe - in its upper part, and thus on the side opposite the holes. Therefore, there is no danger that airborne coating slip will get through the holes. Therefore, a vent dome is generally no longer necessary. Nevertheless, it can be provided.
  • the hole diameter can be changed at any time, and thus also the partial quantity that emerges from the hole in question. You only have to change the stakes.
  • the tube can also be designed conically.
  • the nozzle-like coating device shown in FIG. 1 has a nozzle space 3. This is limited in the web running direction by an overflow bar 4 on the inlet side and a metering bar 5.
  • Spreading material is fed to a distribution pipe 6.
  • the distribution pipe 6 has a plurality of outlet openings, not shown here, which are in conductive connection with a feed channel 7, so that coating slip passes through the channel 7 to the nozzle chamber 3 and thus to the paper web 1.
  • Halfway up the feed channel there are trip hazards 7.1 which produce microturbulence in the coating slip.
  • a discharge channel 8 establishes a conductive connection with an overflow channel 9.
  • At the end of the working channel 8 there is an adjustable valve 10 for controlling the overflow quantity.
  • a device 11 serves to regulate the deflection compensation. It is particularly important to compensate for the deflection of the metering strip 5. However, it is also possible to influence the deflection of the entire coating device.
  • the compensation device 11 is designed in the present case according to DE 39 25 517 A1. It has a fixed yoke 12, a sleeve 13 which surrounds the yoke 12 and pressure transmission elements 14, in the present case air bellows. When the air bellows 14 are charged with compressed air, the position of the sleeve 13 and thus also that of the metering bar 5 is changed, so that a deflection compensation is produced.
  • the compensation device 11 can be designed and arranged in such a way that a sufficiently large “inner stroke” is created in order to also set the width of the gap between the edge of the metering bar 5 and the paper web 1. This requires there is therefore no further facility.
  • a laser measuring device 15 is provided with which the exact position of the edge of the metering bar 5 can be detected. A signal obtained from this is used to control the compensation device 11.
  • the distribution pipe 6 is of cylindrical shape, in the present case as a circular cylinder.
  • the distribution pipe 6 has an inflow end 20 and an outflow end 21.
  • a throttle element 22 is located in the outflow end 21.
  • Inserts 24 are arranged over the length of the distribution pipe 6 - only indicated schematically in FIG. The flow runs in the direction of arrow 25.
  • the sectional view according to FIG. 3 shows the inserts 24 more precisely.
  • the inserts 24 have bores 26 which have a specific diameter d.
  • the interior of the distribution tube 6 is largely filled with coating slip.
  • air bubbles 28 can be seen in FIGS. 2 and 3 in the upper region of the interior. Since the flow according to the invention runs from the inflow end to the outflow end, there is a considerable speed along the entire length of the distribution pipe. There is no flow standstill anywhere. For this reason, the air bubbles 28 also migrate reliably through the entire distribution pipe. They are - as FIG. 3 shows - always opposite the bores 26, so that in any case they cannot emerge through the bores with the coating slip, so that they do not get to the paper web.
  • the bores 26 in the inserts 24 vary in size from insert to insert.
  • the dimension d generally increases slowly with increasing flow, starting from the inflow end 20 to the outflow end 21.
  • the dimension d of the individual hole can be determined very precisely in advance. The aim is to design the dimension d of the inserts in such a way that the same subset of the coating slip emerges from each bore 26, so that the coating slip is distributed as uniformly as possible over the length of the distribution tube 6 and thus over the width of the paper web.
  • the inserts 24 are easily interchangeable.
  • the fastening in the wall of the distribution tube 6 can be carried out by screwing in or clamping in with a snap effect. This has the following meaning:
  • the rheological behavior of coating slips is very different. It is usually completely different from that of water. Often the flow behavior cannot be calculated exactly. For this reason, it is advisable to make the inserts easily interchangeable. Then you can easily switch to holes with different diameters to achieve constant subsets of all holes.
  • the distribution tube 6 - as can be seen from FIG. 3 - has a circular cylindrical shape. However, it can also have an elliptical cross section. The longitudinal axis of the ellipse lies in a vertical plane. This has the advantage that, for a given cross-sectional area of the interior, the distance between the bores 26 on the one hand and the opposite point at which the air bubbles flow is on the other hand as large as possible, so that there is no danger that air bubbles will get to the bores.

Landscapes

  • Coating Apparatus (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Saccharide Compounds (AREA)
  • Paper (AREA)
  • Steroid Compounds (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP92116870A 1991-10-10 1992-10-02 Dispositif pour déposer une sauce d'enduction sur une bande fibreuse. Expired - Lifetime EP0536649B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19914133501 DE4133501C2 (de) 1991-10-10 1991-10-10 Vorrichtung zum Auftragen von Streichfarbe auf eine Faserstoffbahn
DE4133501 1991-10-10
DE4229602 1992-09-04
DE4229602 1992-09-04

Publications (2)

Publication Number Publication Date
EP0536649A1 true EP0536649A1 (fr) 1993-04-14
EP0536649B1 EP0536649B1 (fr) 1995-08-02

Family

ID=25908089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92116870A Expired - Lifetime EP0536649B1 (fr) 1991-10-10 1992-10-02 Dispositif pour déposer une sauce d'enduction sur une bande fibreuse.

Country Status (6)

Country Link
EP (1) EP0536649B1 (fr)
JP (1) JPH05212338A (fr)
AT (1) ATE125895T1 (fr)
CA (1) CA2080397A1 (fr)
DE (1) DE59203096D1 (fr)
FI (1) FI924248A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0781885A1 (fr) * 1995-12-29 1997-07-02 Voith Sulzer Papiermaschinen GmbH Appareil d'enduction pour déposer directement ou indirectement un matériau fluide ou pâteux sur une bande en mouvement
EP0822291A2 (fr) * 1996-08-01 1998-02-04 Voith Sulzer Papiermaschinen GmbH Dispositif d'alimentation avec tuyau de distribution pour appareil d'enduction
WO1999031321A1 (fr) * 1997-12-15 1999-06-24 Jagenberg Papiertechnik Gmbh Buse fendue pour enduire des bandes de materiau, notamment des bandes de papier ou de carton avec une sauce de couchage au pigment
EP3180475B1 (fr) 2014-08-15 2018-10-10 Voith Patent GmbH Dispositif de couchage

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2732678A1 (de) * 1977-07-20 1979-02-01 Barmag Barmer Maschf Spinnverfahren
DE2803904C2 (de) * 1978-01-30 1986-07-03 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Offenend-Spinnverfahren und Spinnvorrichtung
GB2042599B (en) * 1978-10-26 1983-09-21 Platt Saco Lowell Ltd Open-end spinning apparatus
DE19751098C2 (de) * 1997-11-18 2003-02-20 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Verstellen eines langgestreckten, sich in Breitenrichtung einer laufenden Materialbahn erstreckenden Bauteils

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9106311U1 (de) * 1991-05-23 1991-07-25 J.M. Voith Gmbh, 7920 Heidenheim Düsenartige Streicheinrichtung zum Auftragen von Streichmasse auf eine Papierbahn
EP0514735A1 (fr) * 1991-05-23 1992-11-25 J.M. Voith GmbH Dispositif de couchage du type à buse pour appliquer une masse de couchage sur une bande de papier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9106311U1 (de) * 1991-05-23 1991-07-25 J.M. Voith Gmbh, 7920 Heidenheim Düsenartige Streicheinrichtung zum Auftragen von Streichmasse auf eine Papierbahn
EP0514735A1 (fr) * 1991-05-23 1992-11-25 J.M. Voith GmbH Dispositif de couchage du type à buse pour appliquer une masse de couchage sur une bande de papier

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0781885A1 (fr) * 1995-12-29 1997-07-02 Voith Sulzer Papiermaschinen GmbH Appareil d'enduction pour déposer directement ou indirectement un matériau fluide ou pâteux sur une bande en mouvement
US5820675A (en) * 1995-12-29 1998-10-13 Voith Sulzer Papiermaschinen Gmbh Application unit for directly or indirectly applying a fluid or pasty medium to a continuous material web
EP0822291A2 (fr) * 1996-08-01 1998-02-04 Voith Sulzer Papiermaschinen GmbH Dispositif d'alimentation avec tuyau de distribution pour appareil d'enduction
EP0822291A3 (fr) * 1996-08-01 1999-03-31 Voith Sulzer Papiermaschinen GmbH Dispositif d'alimentation avec tuyau de distribution pour appareil d'enduction
US6010078A (en) * 1996-08-01 2000-01-04 Voith Sulzer Papiermaschinen Gmbh Distributing apparatus with tubular manifold for an applicator
WO1999031321A1 (fr) * 1997-12-15 1999-06-24 Jagenberg Papiertechnik Gmbh Buse fendue pour enduire des bandes de materiau, notamment des bandes de papier ou de carton avec une sauce de couchage au pigment
US6471775B1 (en) 1997-12-15 2002-10-29 Jagenberg Papiertechnik Gmbh Slit nozzle for coating trips of material, especially paper or board strips, with a pigment coating
EP3180475B1 (fr) 2014-08-15 2018-10-10 Voith Patent GmbH Dispositif de couchage

Also Published As

Publication number Publication date
EP0536649B1 (fr) 1995-08-02
FI924248A (fi) 1993-04-11
ATE125895T1 (de) 1995-08-15
JPH05212338A (ja) 1993-08-24
CA2080397A1 (fr) 1993-04-11
DE59203096D1 (de) 1995-09-07
FI924248A0 (fi) 1992-09-22

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