EP0556675B1 - Walzenauftragswerk zum Auftragen von Streichfarbe auf eine Papierbahn - Google Patents

Walzenauftragswerk zum Auftragen von Streichfarbe auf eine Papierbahn Download PDF

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Publication number
EP0556675B1
EP0556675B1 EP93101844A EP93101844A EP0556675B1 EP 0556675 B1 EP0556675 B1 EP 0556675B1 EP 93101844 A EP93101844 A EP 93101844A EP 93101844 A EP93101844 A EP 93101844A EP 0556675 B1 EP0556675 B1 EP 0556675B1
Authority
EP
European Patent Office
Prior art keywords
overflow
guide body
roller
paper web
channel
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
EP93101844A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0556675A1 (de
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
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0556675A1 publication Critical patent/EP0556675A1/de
Application granted granted Critical
Publication of EP0556675B1 publication Critical patent/EP0556675B1/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
    • 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
    • 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
    • D21H23/40—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 only one side of the paper being in contact with the material

Definitions

  • the invention relates to a roller applicator for applying coating color to a paper web, according to the preamble of claim 1.
  • Roll-on applicators of this type have become known from DE-A-36 05 409 Al. This device is intended to produce a uniform stroke (see also GB-A-2 178 677).
  • the paper web and the coating color would be desirable for the paper web and the coating color to form a straight line of contact with one another when they are brought together. Due to the described influences of the introduced air, however, the line of contact is not straight, but often tongue-shaped. This applies to roller applicators with a guide body (according to the preamble of claim 1) and therefore also to roller applicators with a free mirror. If there are permanent air pockets that remain over the entire coating zone, the paper web is not wetted by coating color at the relevant points and thus remains uncoated at these points. Of course, this is highly undesirable.
  • the coating color is fed to the inlet gusset and thus to the paper web in sufficient quantity, starting from a necessary minimum quantity up to a maximum quantity.
  • the invention has for its object to design a roller applicator according to the preamble of claim 1 such that the disruptive air influences in the inlet gusset are avoided; furthermore, the coating color should be uniform in the flow across the machine width, i.e. run in the machine direction. Cross currents are undesirable. It should be avoided especially in the contact zone (in the inlet gusset). In particular, the line of contact should meet a straight line when paper web and coating color stream meet. Air pockets should be avoided in any case.
  • a hermetically sealed system is created in this area, in which two barriers, namely the second and the third overflow edge, reliably prevent air from entering the actual application zone.
  • the entire roller applicator can thus have a total of three overflow edges on which ink streams can overflow.
  • the size of the first overflow stream entering the overflow channel from the trough via the first overflow edge can be selected as required and, in extreme cases, can go to zero.
  • the second overflow stream, ie that which flows over the second overflow edge through the discharge channel, will generally be relatively large. Its size can be adjusted using the valve mentioned.
  • the third overflow current - at the throttle point - can go to zero. All of the above-mentioned overflow flows expediently into a single overflow channel, namely into the above-mentioned channel which is connected to the first overflow edge.
  • another air scraper can be connected upstream of the guide body, specifically further away from the inlet gusset in relation to the second and the third overflow edge.
  • a particularly advantageous solution consists in providing the guide body — seen in a side view — on the side on which the paper web runs into the inlet gusset with a special air guide surface.
  • This air guide surface extends from the beginning of the throttle point, which can also form an overflow edge, to the end of the discharge duct. It is preferably concave.
  • the air stream arriving with the paper web hits the edge of the air guide surface where it is scraped off. It then follows the concave air guide surface of the guide body. The air flow is deflected by this guide surface and guided to the outlet end of the discharge duct. An ejector effect occurs here.
  • the air flow in the manner of a water jet nozzle, tears out the coating color flow that flows in the discharge duct, as well as any air that may still be trapped in the discharge duct.
  • the guide body is provided with an air suction channel which begins in the area of the throttle point and which ends in the area of the end of the air guide surface.
  • This air suction channel is therefore subject to the ejector effect of the air flow deflected by the air guide surface.
  • This airflow vents the air intake duct, and thus also the throttle point, which is thus evacuated. This ensures that residual air quantities that initially penetrate the throttle point are discharged from it before they reach the discharge channel or even further.
  • This evacuation is therefore upstream of the discharge channel in order to achieve special security with regard to the freedom from air.
  • the advantage is that this evacuation takes place automatically. Their effect is pending with increasing speed, which of course is particularly cheap.
  • Figure 1 shows a roller applicator according to the invention seen in side view.
  • Figure 2 shows a roller applicator according to the prior art.
  • Figure 3 shows a roller applicator according to the invention, again seen in side view, in a second embodiment.
  • Figure 4 shows a section of a roller applicator according to the invention.
  • Figure 5 shows a schematic representation and a side view of another application work according to the invention.
  • Figure 6 shows detail A in an enlarged view.
  • FIG. 7 shows a top view of the object from FIG. 6.
  • Figure 8 shows the object of Figure 7, again in side view, analogous to the object of Figure 6.
  • FIG. 10 shows three variants 10a, 10b and 10c of views B-B in FIG. 7.
  • FIG. 11 shows four variants of views corresponding to FIG. 7.
  • the variant according to FIG. 11a has, as can be seen, slit-shaped flow paths.
  • widening and narrowing flow channels are possible. It is also conceivable to use venturi-like flow channels in which a narrowing is initially provided, followed by an expansion.
  • FIG. 12 again shows views in the viewing direction A-A or B-B or C-C.
  • Figure 13 shows a further roller applicator according to the invention.
  • Figure 14 shows a further roller applicator according to the invention.
  • the roller applicator shown in Figure 1 comprises an applicator roller 1, which rotates in a coating sump 2.
  • the coating sump 2 is located in a trough 3.
  • the trough 3 has a brush-colored inlet 7.
  • the trough wall is designed as a guide wall 8. It ends with an overflow edge 9 ("first overflow edge"). At this point, an overflow channel 10 is connected for a first overflow stream.
  • a guide body 20 adjoins the guide wall 8 after the overflow edge 9. This extends to the inlet gusset. It forms a flow channel 21 with the lateral surface of the application roller 1. At its downstream end it forms a second overflow edge 22 for a second overflow stream.
  • the guide body 20 has a discharge channel 23. This is used to derive a second overflow current. This current arises from the fact that excess coating color passes over the overflow edge 22 and - through the discharge channel 23 - flows in the flow channel 21 against the direction of flow.
  • An important idea according to the invention is to make the entire guide body 20 variable in its position.
  • a particularly advantageous embodiment consists in making the guide body 20 pivotable, specifically about a pivot point that lies in the region of the overflow edge 22.
  • the guide body 20 also has a throttle point 24, which can serve as an overflow edge and then forms the third overflow edge. It also carries an air scraper 25.
  • the flow channel 23 is provided with a valve 26 at its downstream end.
  • the three overflow streams which overflow at the overflow edges 9, 22 and 24, all open into a single collecting channel, namely the overflow channel 10.
  • the coated paper web 5 After passing through the application zone, the coated paper web 5 reaches the outlet gusset. There it passes an equalized rod 30 and finally a doctor blade 31. However, this area is not of primary importance for the present invention.
  • the roller applicator according to the invention thus works as follows: when it rotates in the direction of the arrow 6, the applicator roller 1 picks up the coating ink from the coating sump 2. There is a flow of the coating color along the guide wall 8 of the trough 3, which continues in flow channel 21. In the application area - in the illustration on the left - there are completely clear and regulated conditions. The entire space between the outer surface of the application roller 1 in its ascending, upper quadrant and the guide body 20 is hermetically sealed. The paper web 5, coming down from the top left when the counter-roller 4 rotates, drags air. However, this air strikes a first air barrier in the form of the air scraper 25. If air overcomes this barrier, it arrives at the overflow edge 24, which represents a further barrier. A last lock is the overflow edge 22 of the guide body 20.
  • FIG. 2 shows a roller applicator according to the prior art.
  • the basic elements are also present here, namely the application roller 1, the counter roller 4, the trough 3, etc.
  • the mirror 40 of the coating swamp In its place is the mirror 40 of the coating swamp. This mirror is exposed to the influence of the masses of air brought in at high speed. The air penetrates the coating slip and passes through the application zone with the paper web and the coating slip. The deletion result is unsatisfactory.
  • FIG. 3 The embodiment of a roller applicator according to the invention shown in FIG. 3 has essentially the same elements as the roller applicator according to FIG. 1.
  • the special feature, however, is that the guide body 20 has a pointed edge in the space between the outer surface of the applicator roller 1 and the guide wall 8 of the trough 3 'and thus has a current dividing effect.
  • the guide body 20 has an air guide surface 36.
  • the throttle point 24 is flat, i.e. it extends over a certain part of the circumference of the counter roller 6.
  • the surface of the guide body 20 facing the paper web 5 could also have the contour 27 shown in broken lines.
  • a ventilation channel 28 is also very crucial. It begins at the throttle point 24 or 27 and ends at the lower end of the air guiding surface 36, and thus also at the lower end of the flow channel 23.
  • FIGS. 5 to 14 describe interesting variants that deal with the design of the guide body.
  • This guide body forms a flow channel together with the outer surface of the application roller 1.
  • the guide body 20 has projections on its side facing the lateral surface of application roller 1, for example ribs, which extend in the longitudinal direction of the flow and which are arranged in a plurality across the width of the machine.
  • ribs which extend in the longitudinal direction of the flow and which are arranged in a plurality across the width of the machine.
  • These can have the shape of a flash, for example, they can expand, they can narrow, or they can be designed in the manner of Venturi nozzles.

Landscapes

  • Coating Apparatus (AREA)
EP93101844A 1992-02-21 1993-02-05 Walzenauftragswerk zum Auftragen von Streichfarbe auf eine Papierbahn Expired - Lifetime EP0556675B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4205312A DE4205312A1 (de) 1992-02-21 1992-02-21 Walzenauftragswerk zum auftragen von streichfarbe auf eine papierbahn
DE4205312 1992-02-21

Publications (2)

Publication Number Publication Date
EP0556675A1 EP0556675A1 (de) 1993-08-25
EP0556675B1 true EP0556675B1 (de) 1996-05-22

Family

ID=6452268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101844A Expired - Lifetime EP0556675B1 (de) 1992-02-21 1993-02-05 Walzenauftragswerk zum Auftragen von Streichfarbe auf eine Papierbahn

Country Status (7)

Country Link
US (1) US5370735A (fi)
EP (1) EP0556675B1 (fi)
JP (1) JPH067723A (fi)
AT (1) ATE138437T1 (fi)
CA (1) CA2090064A1 (fi)
DE (2) DE4205312A1 (fi)
FI (1) FI97904C (fi)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5683510A (en) * 1995-11-29 1997-11-04 Beloit Technologies, Inc. Coater with air collector
DE19702605A1 (de) * 1997-01-24 1998-07-30 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn
US7037575B2 (en) * 1999-11-19 2006-05-02 The Procter & Gamble Company Process for high fidelity printing of tissue substrates, and product made thereby
JP2005296723A (ja) * 2004-04-07 2005-10-27 Mitsubishi Heavy Ind Ltd 塗工装置
ATE430217T1 (de) * 2006-09-01 2009-05-15 Mitsubishi Hitec Paper Bielfel Vorhangbeschichtungsverfahren sowie eine dafür verwendete vorrichtung
US9539605B2 (en) * 2012-02-28 2017-01-10 Toray Plastics (America), Inc. Gravure roll edge masking system for in-line film coating
CN112007815A (zh) * 2020-09-27 2020-12-01 江苏华宇印涂设备集团有限公司 一种网纹辊辊涂装置及双色板辊涂方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR82248E (fr) * 1959-09-25 1964-01-10 Beloit Iron Works Mécanisme destiné à appliquer un enduit à une bande de papier en mouvement
US3461837A (en) * 1965-10-24 1969-08-19 Donald F Dreher Coating apparatus
AT374379B (de) * 1982-03-29 1984-04-10 Zimmer Johannes Vorrichtung zum gleichmaessigen auftragen bestimmbarer fluessigkeitsmengen
DE3446757C2 (de) * 1984-11-17 1995-05-24 Voith Gmbh J M Streicheinrichtung
DE3623402A1 (de) * 1985-07-31 1987-05-21 Jagenberg Ag Verfahren und vorrichtung zum kontinuierlichen aufbringen einer gleichmaessigen beschichtung auf eine ueber eine gegenwalze laufende materialbahn, insbesondere papier- oder kartonbahn
DE3605409C3 (de) * 1986-02-20 1996-07-04 Voith Gmbh J M Einrichtung zur Beschichtung laufender Warenbahnen
DE3704433A1 (de) * 1987-02-12 1988-08-25 Frankenthal Ag Albert Kurzfarbwerk

Also Published As

Publication number Publication date
ATE138437T1 (de) 1996-06-15
CA2090064A1 (en) 1993-08-22
FI97904C (fi) 1997-03-10
FI930609A (fi) 1993-08-22
EP0556675A1 (de) 1993-08-25
DE59302633D1 (de) 1996-06-27
DE4205312A1 (de) 1993-08-26
FI97904B (fi) 1996-11-29
JPH067723A (ja) 1994-01-18
US5370735A (en) 1994-12-06
FI930609A0 (fi) 1993-02-11

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