EP2098638A2 - Procédé de couchage d'un papier humide ou encollé en forme de couche - Google Patents

Procédé de couchage d'un papier humide ou encollé en forme de couche Download PDF

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Publication number
EP2098638A2
EP2098638A2 EP09002420A EP09002420A EP2098638A2 EP 2098638 A2 EP2098638 A2 EP 2098638A2 EP 09002420 A EP09002420 A EP 09002420A EP 09002420 A EP09002420 A EP 09002420A EP 2098638 A2 EP2098638 A2 EP 2098638A2
Authority
EP
European Patent Office
Prior art keywords
paper
coating particles
line
spraying
coating
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.)
Withdrawn
Application number
EP09002420A
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German (de)
English (en)
Other versions
EP2098638A3 (fr
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.)
Kronotec AG
Original Assignee
Kronotec AG
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 Kronotec AG filed Critical Kronotec AG
Publication of EP2098638A2 publication Critical patent/EP2098638A2/fr
Publication of EP2098638A3 publication Critical patent/EP2098638A3/fr
Withdrawn legal-status Critical Current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
    • D21H23/50—Spraying or projecting

Definitions

  • the invention relates to a method for producing a coated paper.
  • Paper or paperboard or cardboard contains as an essential ingredient in addition to the fiber obtained from plant fibers (usually from wood, but also from annual plants) and binders and so-called fillers. These are usually inorganic particles that are added to the paper for various reasons. On the one hand, because the fillers fill gaps between the fibers, one is able to produce much smoother surfaces. It also makes the paper smoother. Furthermore, one can "stretch" the pulp in a way with the corresponding particles in this way. It comes into play that many of the inorganic materials are much cheaper than vegetable fibers and thus can save material costs. For use, e.g.
  • silicates e.g., kaolin
  • sulfates e.g., carbonates
  • oxides e.g., titanium white
  • the starting point of papermaking is in any case an aqueous suspension, which in addition to pulp and binder, if necessary, also excipients such as defoamers, dyes o. ⁇ . may contain.
  • this pulp which has a solids content of about 1%, is first passed through a headbox onto an endless sieve.
  • This endless screen passes under the headbox at high speed (eg 1000 m / min or more) and continues to transport the pulp on its surface.
  • high speed eg 1000 m / min or more
  • This Siebtransports a large part of the water is already deducted, whereby the solids content at the end of Endlossiebs is already about 15-30%.
  • the drainage effect by gravity is enhanced by suction cups placed under the sieve.
  • the first step is followed by the rubber press, then the wet press.
  • the paper is further dewatered by passing it between rollers that successively squeeze out the moisture and condense the paper.
  • the final drying of the paper then takes place in the dryer section, where the paper web runs over a series of steam-heated drying cylinders.
  • the dry paper is smoothed in the calender and rolled up.
  • the paper is then further processed in a calender to the calender.
  • the still wet paper has a moist surface. Upon impact with the surface, the particles wet with the moisture and then adhere to the wet fibers due to cohesive and adhesive forces on the surface of the paper.
  • coating particles refers to all types of particulate solids that are to be applied to the surface of the paper, i. with which the paper is painted. Coating particles are thus the particles that influence the weight, the closedness of the surface and the color of the paper.
  • the great advantage of the method according to the invention is that when brushing no additional moisture is applied to the paper, which would have to be removed again in the further manufacturing process. Compared to prior art methods thus results in savings of energy and water. On the one hand, this represents an economic advantage, on the other hand, the environmental impact also decreases. The expenditure on equipment can also be reduced, since shorter drying paths or simpler drying devices are sufficient, as is the case with conventional methods, due to the lower moisture content after brushing.
  • Suitable coating particles are in particular those types of fillers which are also used in prior art methods of painting. Therefore, the coating particles preferably comprise silicates, in particular kaolin, sulfates, carbonates, in particular chalk, oxides, in particular titanium oxide, or mixtures thereof.
  • the paper used can have different moisture contents. However, it should be noted that if the moisture content is too high, the applied particles can move within the paper, which can be detrimental to uniform, near-surface accumulation or storage. Therefore, advantageously a paper is used which has a moisture content of up to 200% by weight, preferably up to 100% by weight, based on otro pulp (ie the oven-dry, ie at 105 ° C to constant weight dried pulp mass) of the paper , The paper should have a moisture content of at least 60% by weight. Such moisture content is sufficient for effectively adhering the coating particles to the surface.
  • particulate glue is added to the coating particles. If a mixture consisting of coating particles (for example the abovementioned substances from the group of silicates, sulfates, carbonates or oxides) and particulate glue is applied, no water is introduced at all when brushing. Thus, eliminates the need to additionally remove introduced water again.
  • the particulate glue may have thermoplastic properties and melt in the course of the drying process of the paper and thereby bind the particles. Alternatively, the glue particles bind to absorb moisture from the paper and heat upon drying of the paper.
  • the discharge of swirled, coating particles from the line through a spray nozzle is adjustable.
  • the spray nozzle makes it possible to control the coating of the paper very precisely. It can - Depending on the choice of the nozzle - the shape of the spray cone can be adjusted as desired to achieve a predetermined spray result on the paper.
  • the shape of the spray nozzle also depends, for example, on whether the mouth of the line is stationary or movable (we will discuss this below).
  • a wide range of nozzles or nozzle openings can be used for the device according to the invention, for example nozzles with an annular opening or nozzles with a slot-shaped opening. To broader papers, such.
  • the free mouth of the line possibly with the attached spray nozzle, be arranged to be movable parallel to the plane of the paper to be coated, for example, be moved on a rail over the paper to be coated.
  • the distance to the surface can also be changed.
  • the movement of the free orifice relative to the paper is matched to the feed rate of the conveying means, which transport the paper through the device according to the invention.
  • the device according to the invention can also be adapted to the respective paper by the number of the spray nozzle.
  • groups of nozzles may be connected via manifolds to the mouth of the conduit to achieve a predetermined spread pattern. Due to these diverse adjustment options, the application of the coating particles can be individually adapted to the spray to be sprayed Be adapted to paper.
  • Application methods known from the prior art do not allow such an individual adjustment of application quantity and distribution of the coating particles.
  • the coating particles are applied to the paper in an amount of up to 50 g / m 2 .
  • the coating particles may be adapted by surface treatments or by the addition of additives to the spray process of the invention, for example, to prevent clumping or sticking of the coating particles to each other.
  • additives for example, a static charge of the particles can be prevented.
  • the inventive method is extremely efficient and makes it possible to save energy and water. This is a major asset in times of growing awareness of the environmental compatibility of industrial processes. Of course, the process also results in financial savings. Finally, the equipment for drying the coated base paper can be simplified, since due to the lower moisture content of the drying process is less expensive.
  • Fig. 1 shows a device 2 for spraying coating particles.
  • the device 2 has a line 4, the first end 6 is connected to a here schematically indicated by "D" compressed air line.
  • the line 4 (here with a line cross section of 6 mm) and thus also the Venturi nozzle is acted upon via the compressed air line D with an air flow volume of 1.5 m 3 / h.
  • the second end, the free mouth 8 of the conduit 4 is provided with a spray nozzle 10.
  • the line 4 passes through a reservoir 12 containing coating particles.
  • the storage container 12 is operated as a fluidized storage container, that is, the coating particles contained in the reservoir are held in suspension by a separately supplied air or gas stream.
  • the coating particles here a mixture of kaolin and chalk, have a specific gravity of 2.75 g / cm 3 .
  • a Venturi nozzle 14 is inserted into the conduit 4. By means of the negative pressure generated in the venturi nozzle 14 in the operating state, 16 coating particles are sucked from the storage container 12 under swirling into the line via a suction line 16. The delivery air flow is 6 bar.
  • the coating particles S have an average diameter of 60 ⁇ m.
  • the coating particles S are from the Nozzle 10 is sprayed onto the surface of the paper 18.
  • the sheet-shaped paper 18 here consists of uncoated cardboard with a moisture content of 80% by weight based on otro pulp.
  • the spray cone 11 of the spray nozzle 10 is in Fig. 1 indicated; it extends over the entire width of the paper 18.
  • the paper 18 is passed over conveying means, which are indicated as a roll 22, under the spray nozzle 10 at a speed of 500 m / min.
  • the spraying device comprises eighty spray heads which are arranged in the direction of the paper in four rows along a straight line transverse to the transport direction of the base paper, the distance between two spray heads being 20.5 cm in each case.
  • the distance of the openings of the spray nozzles, which are directed vertically downwards from the paper formed by the paper pulp is 25.0 cm.
  • the web speed of the pulp among the eighty fixed spray heads is about 1500 m / min.
  • the spray cone of the individual heads has an opening angle of about 60 °, resulting in the interaction of the heads optimum coverage of the entire width of the paper.
  • the coating particles consist of a mixture of calcium carbonate and titanium oxide with a density of about 2.75 g / cm 3 , as glue, particulate carboxymethylcellulose (CMC) is used. In total, an amount of 45.0 ⁇ 0.5 g / m 2 is applied.
  • FIGS Fig. 2 and 3 With reference to the Fig. 2 and 3 below, a preferred embodiment of an apparatus for carrying out the method according to the invention is explained. Like reference numerals refer to FIGS Fig. 2 . 3 the same components as in Fig. 1 ,
  • the line or lines 4 open into a nozzle 28, which receives a plurality of nozzles 10 which are distributed over the width of the paper 18.
  • the nozzle assembly 28 distributes the turbulent coating particles S and optionally the particulate glue via distributor pipes 4b arranged in the nozzle assembly 28 to the nozzles 10.
  • the nozzle assembly 28 is freely adjustable in height above the paper. Within the nozzle block 28, the nozzles 10 are freely adjustable about their axes.
  • the nozzle 28 is surrounded by a housing 30 which in Fig. 2 is indicated.
  • a suction 32 is connected to the housing 30.
  • the suction unit 32 sucks the conveying air emerging from the nozzles 10 via the suction line 34.
  • the air flow of the suction air is A in Fig. 2 indicated. This avoids unwanted turbulence over the paper.
  • the housing 30 is open to the environment, preferably approximately equal to the paper 18. It can therefore be sucked in to compensate for the pressure of external air F.
  • Fig. 3 shows a preferred embodiment of the spray and suction device.
  • an inner hood 36 is inserted into the housing 30.
  • a cover plate 38 closes off the side wall of the nozzle block 28 to the inner hood 36.
  • a suction channel 40 which is flowed through by the suction air A and possibly sucked external air F.
  • the fan 32 generates through the suction line 34 this air flow.
EP09002420A 2008-03-03 2009-02-20 Procédé de couchage d'un papier humide ou encollé en forme de couche Withdrawn EP2098638A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810012221 DE102008012221B4 (de) 2008-03-03 2008-03-03 Verfahren zum Streichen eines noch feuchten lagenförmigen Substrats

Publications (2)

Publication Number Publication Date
EP2098638A2 true EP2098638A2 (fr) 2009-09-09
EP2098638A3 EP2098638A3 (fr) 2011-01-26

Family

ID=40785448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09002420A Withdrawn EP2098638A3 (fr) 2008-03-03 2009-02-20 Procédé de couchage d'un papier humide ou encollé en forme de couche

Country Status (2)

Country Link
EP (1) EP2098638A3 (fr)
DE (1) DE102008012221B4 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1333091A (en) * 1970-11-12 1973-10-10 Volstatic Coatings Ltd Apparatus for spraying powder
DE4037650A1 (de) * 1990-11-27 1992-06-04 Hoerter Gmbh Verfahren und vorrichtung zur beschichtung von keramikmaterial sowie beschichteter keramikgegenstand
WO1993017182A1 (fr) * 1992-02-27 1993-09-02 Formica Espanola, S.A. Procede et appareil ameliores de production de feuilles superficielles a resistance elevee a l'abrasion, et feuilles ainsi obtenues
WO1993018228A1 (fr) * 1992-03-02 1993-09-16 Imperial Chemical Industries Plc Procede pour traiter et appreter des substrats de papier
US5279854A (en) * 1992-01-27 1994-01-18 Paragon Trade Brands, Inc. Method and apparatus for zoned application of particles in fibrous material
EP0609808A1 (fr) * 1993-02-02 1994-08-10 TOKAI PULP Co., Ltd. Papier thermoadhésif, soluble ou décomposable dans l'eau, et san procédé de fabrication
WO2006060814A2 (fr) * 2004-12-02 2006-06-08 The Procter & Gamble Company Procede pour fabriquer une structure fibreuse comprenant un additif
EP1801290A2 (fr) * 2005-12-16 2007-06-27 Kronotec Ag Procédé et installation destinés à l'application de matières solides sous forme de particules sur un substrat

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE497037C (de) * 1926-08-18 1930-05-01 I G Farbenindustrie Akt Ges Verfahren zur Herstellung eines mit Kennzeichen versehenen Papieres
DE4344552A1 (de) * 1993-12-24 1995-06-29 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zur Ausstattung von Wertpapieren mit Echtheitsmerkmalen
FI108061B (fi) * 1995-10-05 2001-11-15 Metso Paper Inc Menetelmä liikkuvan paperi- tai kartonkirainan päällystämiseksi
FI110274B (fi) * 1996-11-04 2002-12-31 Metso Paper Inc Menetelmä ja sovitelma liikkuvan kartonkiradan päällystämiseksi
DE10120818A1 (de) * 2001-04-27 2002-10-31 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zum Einbringen von Merkmalsstoffen in eine Papierbahn

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1333091A (en) * 1970-11-12 1973-10-10 Volstatic Coatings Ltd Apparatus for spraying powder
DE4037650A1 (de) * 1990-11-27 1992-06-04 Hoerter Gmbh Verfahren und vorrichtung zur beschichtung von keramikmaterial sowie beschichteter keramikgegenstand
US5279854A (en) * 1992-01-27 1994-01-18 Paragon Trade Brands, Inc. Method and apparatus for zoned application of particles in fibrous material
WO1993017182A1 (fr) * 1992-02-27 1993-09-02 Formica Espanola, S.A. Procede et appareil ameliores de production de feuilles superficielles a resistance elevee a l'abrasion, et feuilles ainsi obtenues
WO1993018228A1 (fr) * 1992-03-02 1993-09-16 Imperial Chemical Industries Plc Procede pour traiter et appreter des substrats de papier
EP0609808A1 (fr) * 1993-02-02 1994-08-10 TOKAI PULP Co., Ltd. Papier thermoadhésif, soluble ou décomposable dans l'eau, et san procédé de fabrication
WO2006060814A2 (fr) * 2004-12-02 2006-06-08 The Procter & Gamble Company Procede pour fabriquer une structure fibreuse comprenant un additif
EP1801290A2 (fr) * 2005-12-16 2007-06-27 Kronotec Ag Procédé et installation destinés à l'application de matières solides sous forme de particules sur un substrat

Also Published As

Publication number Publication date
EP2098638A3 (fr) 2011-01-26
DE102008012221A1 (de) 2009-09-10
DE102008012221B4 (de) 2011-06-01

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