EP0825298B1 - Method of simultaneously coating the upper and lower sides of a paper substrate - Google Patents

Method of simultaneously coating the upper and lower sides of a paper substrate Download PDF

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Publication number
EP0825298B1
EP0825298B1 EP97113481A EP97113481A EP0825298B1 EP 0825298 B1 EP0825298 B1 EP 0825298B1 EP 97113481 A EP97113481 A EP 97113481A EP 97113481 A EP97113481 A EP 97113481A EP 0825298 B1 EP0825298 B1 EP 0825298B1
Authority
EP
European Patent Office
Prior art keywords
coating material
roller
rubber
web
rubber roller
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
EP97113481A
Other languages
German (de)
French (fr)
Other versions
EP0825298A2 (en
EP0825298A3 (en
Inventor
Frank Dr. Henke
Karsten Dr. Seitz
Ralf Hirsch
Christian Detzer
Herbert Dr. Knolle
Peter Jauchen
Klaus Dr. Külper
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.)
Tesa SE
Original Assignee
Tesa SE
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 Tesa SE filed Critical Tesa SE
Publication of EP0825298A2 publication Critical patent/EP0825298A2/en
Publication of EP0825298A3 publication Critical patent/EP0825298A3/en
Application granted granted Critical
Publication of EP0825298B1 publication Critical patent/EP0825298B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • 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
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D21H23/60—Details thereof, e.g. surface characteristics, peripheral speed the material on the applicator roll being subjected to a particular treatment before applying to the paper
    • 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
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D21H23/62—Reverse roll coating, i.e. applicator roll surface moving in direction opposite to that of the paper
    • 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
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/22—Polyalkenes, e.g. polystyrene
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/32—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming a linkage containing silicon in the main chain of the macromolecule
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/06—Vegetable or imitation parchment; Glassine paper

Definitions

  • the invention relates to a method for the simultaneous application of the top and the Underside of a paper carrier web, each with a liquid coating material.
  • Paper is often used as a backing material for adhesive tapes. Find such tapes Use u. a. as masking tapes for painting and varnishing, tapes for the Processing of electronic components or as packaging adhesive tapes.
  • the paper carriers are subjected to a special pretreatment.
  • the Paper is first given an impregnation.
  • the impregnation gives this Paper added strength and insensitivity to moisture.
  • it is impregnating agents are aqueous dispersions, but also solvent-based ones Systems are possible.
  • polymers for impregnation are: Styrene-butadiene copolymers, acrylonitrile-butadiene copolymers, acrylates, polychloroprene and polymers of the groups mentioned which have been modified with carboxyl groups or other comonomers. Mixtures of the polymers are also possible, as are mixtures with other substances, for example resins, plasticizers and other auxiliaries.
  • the paper backing is coated with a layer of lacquer on the back, a so-called release varnish, as well as a primer on the adhesive side equipped.
  • the release varnish initially has the function of adhering the adhesive to the Limit the back of the paper to a size that is easy to cut to length Band guaranteed from the role.
  • the Releaselack also meet application-specific requirements, for example sufficient paint and paint adhesion on the back of the tape for painter masking tapes or a quiet rolling noise in packaging tapes.
  • Aqueous dispersions or mixtures of aqueous dispersions are very often used as Release paints are used, but they are also solvent-based or so-called 100% systems possible.
  • release systems are often used as mixtures of different polymers or also low-molecular, separating agents, such as waxes, fats or the like. formulated. Therefore, only a few options are shown here.
  • Systems based on PVC, acrylates, acrylate copolymers or vinyl acetate copolymers are frequently used.
  • the systems often consist of mixtures in which one part acts as a binder, while the release effect comes from another component.
  • An example here is the mixture of an SBR latex (binder) with a copolymer of styrene and maleic acid amide, as described in German Offenlegungsschrift DE-A-28 45 541. If necessary, a third component based on acrylate can also be used.
  • the job of the primer is to anchor the adhesive on the paper backing support. Detachment often occurs without the use of a suitable primer the adhesive when peeling off the surface, which is also the case with masking tapes for painting and varnishing is not acceptable.
  • Aqueous dispersions or mixtures of aqueous dispersions are very often used as Primer used, but solvent-based systems are also possible.
  • the release varnishes and primers are applied over rollers, doctor blades etc.
  • the application is carried out by means of a doctor blade, in that the paper carrier web is carried out at a presettable distance under the doctor blade, the component to be coated being placed on the paper carrier web in front of the doctor blade.
  • the doctor blade ensures an even application of the component.
  • the component to be coated can be applied via a roller, if appropriate in combination with a doctor blade.
  • the component can also be drawn into the paper carrier web by means of negative pressure by using a suction roller over which the paper carrier web is guided.
  • the order quantities are to be chosen accordingly high, so that strong knocking off is compensated in the paper. But this also increases the risk of Mass breakdown.
  • EP 0 480 897 A1 discloses a method for metering a coating agent onto a moving substrate, in which several pairs of rollers are used, including a pair of rubber rollers, between the gap of which the web is conveyed, and a pair of transfer rollers, the transfer rollers in each case are arranged in opposite directions to the rubber rollers and not in opposite directions. Furthermore, it is not disclosed to design the transfer rollers as anilox rollers.
  • a method which shows the device in which one Paper web on one side with a breakable, liquid-containing cell or Capsule layer is coated.
  • the device consists of several Coating stations, which in turn are composed of several rollers. Sofem in meet the rollers, they always run in opposite directions.
  • US 5,516,365 A shows a method for impregnating and / or coating a Paper web in which the roller used to transfer the liquid to be coated in a bath containing the liquid.
  • the paper web is used to transfer the Liquid passed into a nip formed by a drum and the roller becomes. Roller and drum rotate in the same direction.
  • EP 0 365 640 A2 discloses a process to the public in which a liquid containing microcapsules is also transferred on one side to a paper, in the gap between a hard application roll and a deformable one Metering rollers that rotate in opposite directions.
  • the object of the invention was to provide a method which has the disadvantages of State of the art not or at least not to the extent and that in particular preventing the coating material from striking through.
  • Claim 2 describes a second embodiment of the method, which differs from that distinguishes the former only in that a rubber roller is omitted, i.e. the Application takes place directly with an anilox roller running in the same direction.
  • Claim 2 describes a second embodiment of the method, which differs from that distinguishes the former only in that a rubber roller is omitted, i.e. the Application takes place directly with an anilox roller running in the same direction.
  • the method for simultaneously applying the top and bottom of a paper carrier web each with a low-viscosity coating material consists of the features listed below.
  • the paper carrier web is guided through the gap between two counter-rotating rubber rollers, which is -200 ⁇ m to -10 ⁇ m, in particular -50 ⁇ m to -10 ⁇ m.
  • the first coating material is applied to the top of the paper carrier web by means of the first rubber roller.
  • the first coating material is transferred beforehand to the first rubber roller from a first anilox roller which runs in the same direction as the first rubber roller and which in turn is supplied with the first coating material by means of a sprue device.
  • the second coating material is applied in parallel to the underside of the paper carrier web by means of a second rubber roller, the second coating material being transferred to the second rubber roller by a second anilox roller which runs in the same direction as the second rubber roller.
  • the second anilox roller is also supplied with the second coating material by means of a further pouring device.
  • the first anilox roller and the second anilox roller are operated in particular at a relative speed of 50% to 150%, preferably 90% to 135%, in the same direction as the first and second rubber rollers.
  • the paper carrier web is guided through the gap between a rubber roller and a second anilox roller that is parallel to the rubber roller, the gap between rubber roller and anilox roller being -200 ⁇ m to - 10 ⁇ m, in particular -50 ⁇ m to -10 ⁇ m, is.
  • the top of the paper carrier web is loaded with the first coating material via the rubber roller.
  • the first coating material is transferred to the rubber roller from a first anilox roller which runs in the same direction as the first rubber roller and which in turn receives the first coating material from a sprue device.
  • the underside of the paper carrier web is acted upon by the second coating material via the second anilox roller, to which the second coating material is also applied via a further sprue device.
  • the first anilox roller and the second anilox roller are operated in particular at a relative speed of 50% to 150%, preferably 90% to 135%, in the same direction as the rubber roller and in the opposite direction to the carrier web.
  • the rubber rollers used in the process advantageously have a Shore hardness from 40 to 90, in particular 40 to 60.
  • the anilox rollers preferably have an 18-80, in particular a 36-60 division.
  • the anilox rollers are provided with a closed sprue box into which the Coating media with a pressure of 0.05 bar to 0.5 bar, preferably 0.1 bar to 0.3 bar can be fed.
  • the pressure specifications correspond to that present chamber pressure.
  • the method is particularly advantageous if the first coating material is a is aqueous primer dispersion and the second coating material from an aqueous Release dispersion is formed.
  • An aqueous release dispersion can also advantageously be used as the first coating material can be applied on one side if at the same time the second coating material from one aqueous post-coating is formed.
  • the inventive method is excellent suitable for the coating of paper carrier webs for the production of adhesive tape, in particular creped paper carrier webs. Surprisingly, it turns out that the known disadvantages of ago conventional coating processes do not occur.
  • the method according to the invention are the coating goods due to the nip with light Pressure applied to the paper surface. Because simultaneously on both sides If a coating material with excess pressure is applied to the paper surface, a mass breakdown occurs reliably prevented.
  • the respective penetration depth of the coating material can be regulated. This ensures constant order quantities and opens up the possibility of to work with minimal order quantities.
  • Another advantage of the disclosed method is that, in the case of coating materials which are aqueous on both sides, an excellent flatness of the paper is obtained which can be regulated by the amount of coating.
  • the reason for this is that the paper is subjected to the coating goods from both sides at the same time and an identical drying speed is preset in a downstream floating nozzle dryer on the top and bottom of the paper carrier web. Swelling processes in the fibers, the release of tensions in the surfaces or the creation of new tensions (e.g. shrinkage due to the entanglement of residual hemicellulose and other amorphous constituents) take place in the same direction on the top and bottom of the paper.
  • the improved flatness in turn has a positive effect on the coating quality of the adhesive.
  • top of the paper backing with an aqueous primer dispersion and an aqueous release dispersion is applied to the underside excellent results. Due to the simultaneous coating on one
  • the application point on the top and on the bottom is wetted simultaneously (Water) of the paper carrier web from both sides and an installation of solid matter in the Paper.
  • a boundary layer forms between the lacquer and the inside of the paper thickness Primer dispersion without mixing. So that is undesirable described Penetration of the coating goods excluded.
  • the paper carrier web 1 in the nip 23 After the coating process of the paper carrier web 1 in the nip 23, it is fed via a non-contact web guiding element 5 to a floating nozzle dryer which is not further described.
  • the paper carrier web is then further processed in the form of a coating with known solvent-based adhesive systems in conventional application processes.
  • the paper carrier web 1 is guided into the nip 23, which from one to the Paper carrier web 1 rubber roller 22 operated in the same direction and by a first, counter to the paper carrier web 1 and operated in the same direction to the rubber roller 22 Anilox roller 31 is formed.
  • the anilox roller 31 directly coats the underside of the paper carrier web 1 an aqueous primer dispersion, the anilox roller 31 via a first sprue 41 is supplied with the coating material.
  • the aqueous solution is applied in accordance with the process described above Lacquer dispersion also via a rubber roller 22, which via a screen roller 32 with the Paint dispersion is supplied, which in turn the coating material from a second Gating device 42 receives.
  • Example 1 Thin paper carrier web, namely a flat crepe carrier, Thickness of the paper carrier web: 150 ⁇ m
  • the paper carrier web was treated with an impregnation, based on an SBR latex, impregnated.
  • the impregnation was carried out on a conventional impregnation system, which is supplied by various suppliers. Here an impregnation system from VITS (Erkrath) was used. The impregnation took place in the Immersion process, followed by squeezing off the excess in one Squeezer. The impregnation was made until the paper was completely saturated.
  • the position of this boundary layer in the paper can be influenced in a targeted manner by the method chosen in the invention.
  • the selection of the anilox rollers, the selected chamber pressure, the transfer rollers, the relative speed of the rollers, but also other parameters determine this boundary layer.
  • the coating thickness that is to say the thickness of the layer into which the respective coating material is to penetrate, is thus precisely defined by the respective coating material.
  • Another advantage of the method according to the invention is that the curling of the Edges of the coated paper carrier web are avoided, which is a one-sided Wetting cannot be suppressed.
  • FIG. 1 shows the particularly advantageous method according to claim 1 and in Figure 2 shown according to claim 2.
  • the paper carrier web 1 is rectilinear in the gap 23 between two opposed rubber rollers 21, 22 out.
  • the rubber rollers 21, 22 are not on one Mounted frame shown, with a corresponding adjustment mechanism the gap width between the rubber rollers 21, 22 can be preset can.
  • first rubber roller 21 the underside of the paper carrier web 1 with a applied aqueous primer dispersion.
  • the rubber roller 21 itself takes over first anilox roller 31, which is driven in parallel with the rubber roller 21, the aqueous Primer dispersion.
  • a first sprue 41 advantageously with a light If the excess pressure is operated from 0.05 bar to 0.5 bar, the anilox roller 31 is coated.
  • the top of the paper carrier web 1 with a applied aqueous paint dispersion is about the second rubber roller 22, the top of the paper carrier web 1 with a applied aqueous paint dispersion.
  • the rubber roller 22 and the same to this operated anilox roller 32 also obtain the coating material from a second, advantageously operated with a slight excess pressure of 0.05 bar to 0.5 bar Gating device 42.
  • First coating material aqueous primer dispersion
  • Second coating material aqueous lacquer dispersion (release lacquer)
  • the system according to the invention was a pilot plant system for determining the in the Description cited parameters.
  • the rollers were assembled in the roller mill of a 5-roll applicator, the subsequent drying in one The float nozzle dryer.
  • the gap between the rubber rollers was preset to 80 ⁇ m.
  • the carrier thus finished was coated with 50 g / m 2 (dry substance) of a solvent-based natural rubber adhesive.
  • a solvent-based natural rubber adhesive It is an ESH post-crosslinkable adhesive that is used as standard for the masking tapes, consisting of natural rubber, adhesive resins and fillers.
  • Adhesive strength steel 3.9 N / cm Take-off speed 300 mm / min Based on AFERA 4001 Adhesion back 1.8 N / cm dito AFERA 4001 unwind 1.0 N / cm Unwind speed 30 m / min AFERA 4013 ultimate tensile strength 42 N / cm Test speed 300 mm / min AFERA 4004 elongation at break 10% AFERA 4005
  • the product produced by the process according to the invention was suitable according to the Results of the application-technical examination very well as a masking tape.
  • it proved to be extremely resistant to emulsion paints Strip peel test of glued on sheet steel and with commercially available emulsion paint The streaked sample strips never split the product, neither after 5, 10, 15 after 20 minutes of exposure to the emulsion paint.
  • the product could be ripped off various substrates, even after a longer period Bonding time and under extreme peeling conditions (extremely fast, extreme Voltage), remove again. Glass and PVC with bonding times were explicitly tested up to 24 hours.
  • Example 2 Production of an adhesive tape based on transparent paper, parchment paper or high-density glassine paper
  • the primer dispersion and the release lacquer dispersion were removed from the aqueous Phase coated.
  • aqueous solution of a commercially available polyvinyl alcohol was used as the primer (Trade name Mowiol from Hoechst).
  • the viscosity was set to Ford cup with 4 mm nozzle at 18 ⁇ 4 sec.
  • the release component consisted of the mixture of a polyvinyl alcohol solution (see above) a silicone release emulsion.
  • the polyvinyl alcohol takes on the function of Film formers, the silicone emulsion in the amount of the desired separation effect be coordinated.
  • the viscosity of the release dispersion was measured on Ford beakers 4 mm outlet nozzle set at 18 ⁇ 4 sec.
  • the supports coated in this way were coated immediately afterwards with a solvent-based acrylate adhesive. It is a 38% solvent-based acrylic adhesive, which can be obtained from National Starch, for example. An adhesive composition of 20 ⁇ 2 g / m 2 was carried out.
  • a channel coating system with a knife-over-roll applicator was used as the coating system used.
  • the system according to the invention was a pilot plant system for determining the in the Description cited parameters.
  • the rollers were assembled in the roller mill of a 5-roll applicator, the subsequent drying in one The float nozzle dryer.
  • the gap between the rubber rollers was preset to 20 ⁇ m.
  • Example 3 Production of an adhesive tape on the basis of the carrier mentioned in Example 2 with acrylic dispersion adhesive
  • the acrylic dispersion adhesive was used with a viscosity of 200 - 600 mPa * s at 30 1 / s and 20 ° C.
  • the mass application was set at 20 ⁇ 1 g / m 2 .
  • the release varnish was adjusted with a viscosity of Ford flow cup with 4 mm nozzle of 18 ⁇ 4 sec.
  • the system according to the invention was a pilot plant system for determining the in the Description cited parameters.
  • the rollers were assembled in the roller mill of a 5-roll applicator, the subsequent drying in one The float nozzle dryer.
  • the gap between the anilox roller for the adhesive dispersion and the release rubber roller was preset to 50 ⁇ m.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft ein Verfahren zur gleichzeitigen Beaufschlagung der Oberseite und der Unterseite einer Papierträgerbahn mit jeweils einem flüssigen Beschichtungsgut.The invention relates to a method for the simultaneous application of the top and the Underside of a paper carrier web, each with a liquid coating material.

Papier wird häufig als Trägermaterial für Klebebänder eingesetzt. Derartige Bänder finden Verwendung u. a. als Abdeckbänder beim Malen und Lackieren, Gurtungsbänder für die Verarbeitung elektronischer Bauteile oder als Verpackungsklebebänder.Paper is often used as a backing material for adhesive tapes. Find such tapes Use u. a. as masking tapes for painting and varnishing, tapes for the Processing of electronic components or as packaging adhesive tapes.

Sehr häufig werden die Papierträger dazu einer speziellen Vorbehandlung unterzogen. Das Papier wird zunächst mit einer Imprägnierung versehen. Die Imprägnierung verleiht dem Papier zusätzliche Festigkeit sowie Unempfindlichkeit gegen Feuchtigkeit. Oft handelt es sich bei den Imprägniermitteln um wäßrige Dispersionen, aber auch lösungsmittelbasierte Systeme sind möglich.Very often, the paper carriers are subjected to a special pretreatment. The Paper is first given an impregnation. The impregnation gives this Paper added strength and insensitivity to moisture. Often it is impregnating agents are aqueous dispersions, but also solvent-based ones Systems are possible.

Als Polymere für eine Imprägnierung kommen beispielsweise in Frage:
Styrol-Butadien-Copolymere, Acrylnitril-Butadien-Copolymere, Acrylate, Polychloroprene sowie mit carboxylgruppenhaltigen oder anderen Comonomeren modifizierte Polymere der genannten Gruppen. Es sind auch Mischungen der Polymere möglich, sowie Mischungen mit weiteren Stoffen, z.B. Harzen, Weichmachem und anderen Hilfsstoffen.Examples of polymers for impregnation are:
Styrene-butadiene copolymers, acrylonitrile-butadiene copolymers, acrylates, polychloroprene and polymers of the groups mentioned which have been modified with carboxyl groups or other comonomers. Mixtures of the polymers are also possible, as are mixtures with other substances, for example resins, plasticizers and other auxiliaries.

Die Aufzählung erhebt keinesfalls den Anspruch auf Vollständigkeit, sondern bietet lediglich einen kleinen Ausschnitt aus den möglichen Polymeren. Eine zusammenfassende Darstellung der Imprägniertechnik findet sich zum Beispiel im Lehrbuch von D. Satas (D. Satas: Handbook of Pressure Sensitive Adhesive Technology, Van Nostrand Reinhold Company Inc., New York, 1982, Seite 682 ff).The list does not claim to be complete, it merely offers a small extract from the possible polymers. A summary Representation of impregnation technology can be found, for example, in the textbook by D. Satas (D. Satas: Handbook of Pressure Sensitive Adhesive Technology, Van Nostrand Reinhold Company Inc., New York, 1982, page 682 ff).

In weiteren Verarbeitungsschritten werden die Papierträger mit einer rückseitigen Lackschicht, einem sogenannten Releaselack, sowie auf der späteren Klebseite mit einem Primer ausgerüstet.In further processing steps, the paper backing is coated with a layer of lacquer on the back, a so-called release varnish, as well as a primer on the adhesive side equipped.

Der Releaselack hat dabei zunächst die Funktion die Haftung der Klebmasse auf der Rückseite des Papiers auf ein Maß zu begrenzen, das einerseits ein leichtes Ablängen des Bandes von der Rolle gewährleistet. Andererseits muß auch eine Mindesthaftung aufrechterhalten werden, da ein zu leichtes Abrollen, zum Beispiel allein unter der Wirkung der Schwerkraft (der sogenannte Jo-Jo-Effekt), ebenso unerwünscht ist. Daneben muß der Releaselack auch anwendungsspezifische Anforderungen erfüllen, beispielsweise ausreichende Haftung von Lacken und Farben auf der Bandrückseite bei Malerabdeckbändern oder ein leises Abrollgeräusch bei Verpackungsklebebändern.The release varnish initially has the function of adhering the adhesive to the Limit the back of the paper to a size that is easy to cut to length Band guaranteed from the role. On the other hand, there must also be a minimum liability be maintained, as unrolling is too easy, for example under the effect alone gravity (the so-called yo-yo effect) is also undesirable. In addition, the Releaselack also meet application-specific requirements, for example sufficient paint and paint adhesion on the back of the tape for painter masking tapes or a quiet rolling noise in packaging tapes.

Sehr häufig werden wäßrige Dispersionen oder Mischungen von wäßrigen Dispersionen als Releaselacke eingesetzt, es sind aber auch lösungsmittelbasierte oder sogenannte 100 %-Systeme möglich.Aqueous dispersions or mixtures of aqueous dispersions are very often used as Release paints are used, but they are also solvent-based or so-called 100% systems possible.

Die Auswahl an geeigneten Polymeren als Basis für Release-Coatings ist sehr groß, zusätzlich werden Release-Systeme häufig als Mischungen verschiedener Polymere oder auch niedermolekularer, trennwirksamer Agenzien, z.B. Wachsen, Fetten o.ä. formuliert. Es werden hier deshalb nur einige Möglichkeiten dargestellt.
Häufig werden auf PVC basierende Systeme, Acrylate, Acrylatcopolymere oder Vinylacetatcopolymere eingesetzt. Oft bestehen die Systeme auch aus Mischungen, in denen ein Teil die Funktion eines Bindemittels übernimmt, während die Releasewirkung von einem weiteren Bestandteil herrührt. Als Beispiel sei hier die Mischung von einem SBR-Latex (Binder) mit einem Copolymer aus Styrol und Maleinsäureamid genannt, wie sie in der deutschen Offenlegungsschrift DE-A-28 45 541 beschrieben ist. Gegebenenfalls kann auch noch eine dritte Komponente auf Basis Acrylat eingesetzt werden.The selection of suitable polymers as the basis for release coatings is very large; in addition, release systems are often used as mixtures of different polymers or also low-molecular, separating agents, such as waxes, fats or the like. formulated. Therefore, only a few options are shown here.
Systems based on PVC, acrylates, acrylate copolymers or vinyl acetate copolymers are frequently used. The systems often consist of mixtures in which one part acts as a binder, while the release effect comes from another component. An example here is the mixture of an SBR latex (binder) with a copolymer of styrene and maleic acid amide, as described in German Offenlegungsschrift DE-A-28 45 541. If necessary, a third component based on acrylate can also be used.

Eine Übersicht über den Stand der Technik bezüglich der Release-Beschichtung ist im oben zitierten Lehrbuch von Satas gegeben (Seiten 585 ff). An overview of the prior art regarding the release coating is in the above cited textbook given by Satas (pages 585 ff).

Der Primer hat die Aufgabe, die Verankerung der Klebmasse auf dem Papierträger zu unterstützen. Häufig kommt es ohne die Anwendung eines geeigneten Primers zum Ablösen der Klebmasse beim Abziehen vom Untergrund, was unter anderem bei Abdeckbändern für das Malen und Lackieren nicht akzeptabel ist.The job of the primer is to anchor the adhesive on the paper backing support. Detachment often occurs without the use of a suitable primer the adhesive when peeling off the surface, which is also the case with masking tapes for painting and varnishing is not acceptable.

Sehr häufig werden wäßrige Dispersionen oder Mischungen von wäßrigen Dispersionen als Primer eingesetzt, es sind aber auch lösungsmittelbasierte Systeme möglich.Aqueous dispersions or mixtures of aqueous dispersions are very often used as Primer used, but solvent-based systems are also possible.

Als Polymergrundlage kommen hierbei alle Systeme in Betracht, die in der Lage sind, die Affinität der Klebmasse gegenüber dem imprägnierten Papierträger zu erhöhen. Dazu werden häufig Systeme eingesetzt, die chemisch sowohl der Klebmasse als auch dem Imprägniermittel ähnlich sind, also zum Beispiel für Klebstoffe ein System auf Basis von Naturkautschuk. Als alternative Systeme seien genannt Systeme auf Basis von modifiziertem Naturkautschuk, von Synthesekautschuken sowie von Abmischungen mit anderen, in den Klebmassen enthaltenen Substanzen, zum Beispiel Harzen.
Primer auf Lösemittelbasis können gegebenenfalls auch mit reaktiven Komponenten versehen sein, um eine starke Anbindung an die Klebmasse zu gewährleisten. Bei lösemittelbasierten Primern ist die Verwendung von Isocyanaten zu diesem Zweck nicht unüblich.All systems which are capable of increasing the affinity of the adhesive composition for the impregnated paper carrier are considered as the polymer basis. To this end, systems are often used that are chemically similar to both the adhesive and the impregnating agent, for example a system based on natural rubber for adhesives. Systems based on modified natural rubber, synthetic rubbers and blends with other substances contained in the adhesive compositions, for example resins, may be mentioned as alternative systems.
Solvent-based primers can optionally also be provided with reactive components to ensure a strong bond to the adhesive. In the case of solvent-based primers, the use of isocyanates for this purpose is not uncommon.

Die Releaselacke und Primer werden über Walzen, Rakel etc. aufgetragen.
So erfolgt der Auftrag mittels einer Rakel, indem die Papierträgerbahn mit einem voreinstellbaren Abstand unter der Rakel durchgeführt wird, wobei die zu beschichtende Komponente vor der Rakel auf die Papierträgerbahn gegeben wird. Die Rakel sorgt für einen gleichmäßigen Auftrag der Komponente.
Weiterhin kann der Auftrag der zu beschichtenden Komponente über eine Walze erfolgen, gegebenenfalls in Kombination mit einer Rakel. Schließlich kann, wie es in der deutschen Offenlegungsschrift DE-A-43 29 218 dargelegt ist, die Komponente auch durch Verwendung einer Saugwalze, über die die Papierträgerbahn geführt wird, mittels Unterdruck in die Papierträgerbahn gezogen werden.The release varnishes and primers are applied over rollers, doctor blades etc.
The application is carried out by means of a doctor blade, in that the paper carrier web is carried out at a presettable distance under the doctor blade, the component to be coated being placed on the paper carrier web in front of the doctor blade. The doctor blade ensures an even application of the component.
Furthermore, the component to be coated can be applied via a roller, if appropriate in combination with a doctor blade. Finally, as set out in German Offenlegungsschrift DE-A-43 29 218, the component can also be drawn into the paper carrier web by means of negative pressure by using a suction roller over which the paper carrier web is guided.

Allen diesen Auftragstechniken ist gemein, daß Releaselack und Primer in getrennten Verfahrensschritten aufgetragen werden. All these application techniques have in common that release varnish and primer in separate Process steps are applied.

Diese Art des Auftrags ist aber mit einigen Mängeln behaftet. Zunächst ist hier die große räumliche Ausdehnung einer solchen sequentiellen Auftragsanlage zu nennen, insbesondere, wenn der Releaselack vor dem Auftrag des Primers zunächst getrocknet wird.However, this type of order has some shortcomings. First of all, here is the big one to mention the spatial extent of such a sequential order system, in particular if the release varnish is first dried before the primer is applied.

In diesen Fällen ist es äußerst schwierig, wenn nicht überhaupt unmöglich, eine einwandfreie Flachlage beziehungsweise Planlage des Papiers zu erhalten.In these cases, it is extremely difficult, if not impossible, to have a flawless one To get flat or flat of the paper.

Ein weiterer Mangel des Verfahrens ist, daß es bei dem einseitigen Auftragsverfahren immer wieder zum Durchschlagen des Lackes oder des Primers kommt. Dieser Mangel äußert sich immer dann besonders gravierend, wenn relativ dünne Papierträger mit niedrigviskosen Medien beschichtet werden.
Die negativen Effekte des Durchschlagens sind offenkundig:

  • Durchschlag des Releaselacks auf die Primerseite setzt dort die Haftung der Klebmasse herab und kann dann zu den oben beschriebenen Ablöseerscheinungen der Klebmasse führen.
  • Durchschlag des Primers auf die Releaseseite setzt dort die Haftung der Klebmasse herauf; es resultieren inakzeptabel hohe Abrollkräfte oder gar punktförmiges oder flächiges Herausreißen von Klebmasse beim Abrollen.
Another shortcoming of the process is that the one-sided application process repeatedly causes the paint or primer to bleed through. This deficiency is particularly serious when relatively thin paper substrates are coated with low-viscosity media.
The negative effects of strikethrough are obvious:
  • Penetration of the release lacquer onto the primer side reduces the adhesion of the adhesive there and can then lead to the detachment phenomena described above.
  • Penetration of the primer on the release side increases the adhesion of the adhesive there; this results in unacceptably high rolling forces or even punctiform or flat tearing out of adhesive when unrolling.

Ein weiterer Mangel des Verfahrens liegt darin, daß die Mengen an Releaselack bzw. Primer, die an der Oberfläche des Papiers zur Verfügung stehen, stark schwanken, da ein Teil der Medien in den Träger einsackt. Dieser Anteil variiert in Abhängigkeit von der Aufnahmefähigkeit des Papiers für das jeweilige Medium. Die Saugfähigkeit des Papiers ist aber keineswegs konstant, weder von Fertigung zu Fertigung noch innerhalb einer Fertigung. Darüber hinaus sind bei Krepp-Papieren Poren bzw. Pinholes nicht auszuschließen, die ein Durchschlagen noch verstärken.Another shortcoming of the method is that the amounts of release varnish or Primers that are available on the surface of the paper fluctuate greatly as a Part of the media sacks into the carrier. This proportion varies depending on the Absorbance of the paper for the respective medium. The absorbency of the paper is but by no means constant, neither from manufacture to manufacture nor within one Production. In addition, pores or pinholes cannot be ruled out with crepe papers, which increase penetration.

Die Auftragsmengen sind dementsprechend hoch zu wählen, damit auch starkes Wegschlagen in das Papier kompensiert wird. Dies erhöht aber gleichzeitig die Gefahr des Massedurchschlags.The order quantities are to be chosen accordingly high, so that strong knocking off is compensated in the paper. But this also increases the risk of Mass breakdown.

Aus der EP 0 480 897 A1 ist ein Verfahren zum Dosieren eines Streichmittels auf eine sich fortbewegende Unterlage bekannt, in dem mehrere Walzenpaare Verwendung finden, u.a. ein Paar Gummiwalzen, zwischen deren Spalt die Bahn gefördert wird, und ein Paar Übertragungswalzen, wobei die Übertragungswalzen jeweils gegenläufig zu den Gummiwalzen angeordnet sind und nicht gegenläufig.
Des weiteren ist nicht offenbart, die Übertragungswalzen als Rasterwalzen auszuführen.EP 0 480 897 A1 discloses a method for metering a coating agent onto a moving substrate, in which several pairs of rollers are used, including a pair of rubber rollers, between the gap of which the web is conveyed, and a pair of transfer rollers, the transfer rollers in each case are arranged in opposite directions to the rubber rollers and not in opposite directions.
Furthermore, it is not disclosed to design the transfer rollers as anilox rollers.

Aus der DE 21 43 635 A1 ist ein Verfahren bekannt, das Vorrichtung zeigt, in der eine Papierbahn einseitig mit einer aufbrechbaren, Flüssigkeit enthaltenden Zell- oder Kapselschicht beschichtet wird. Die Vorrichtung besteht aus mehreren Beschichtungsstationen, die sich ihrerseits aus mehreren Walzen zusammensetzt. Sofem in den Stationen Walzen zusammentreffen, laufen diese stets gegenläufig.From DE 21 43 635 A1 a method is known which shows the device in which one Paper web on one side with a breakable, liquid-containing cell or Capsule layer is coated. The device consists of several Coating stations, which in turn are composed of several rollers. Sofem in meet the rollers, they always run in opposite directions.

Die US 5,516,365 A zeigt ein Verfahren zur Tränkung und/oder Beschichtung einer Papierbahn, in dem die zur Übertragung der zu beschichtenden Flüssigkeit dienende Walze in einem die Flüssigkeit enthaltenden Bad läuft. Die Papierbahn wird zur Übertragung der Flüssigkeit in einen Walzenspalt geführt, der von einer Trommel und der Walze gebildet wird. Walze und Trommel rotieren gleichsinnig.US 5,516,365 A shows a method for impregnating and / or coating a Paper web in which the roller used to transfer the liquid to be coated in a bath containing the liquid. The paper web is used to transfer the Liquid passed into a nip formed by a drum and the roller becomes. Roller and drum rotate in the same direction.

Mit der EP 0 365 640 A2 ist ein Verfahren der Öffentlichkeit bekannt geworden, in dem ebenfalls eine Mikrokapseln enthaltende Flüssigkeit einseitig auf ein Papier übertragen wird, und zwar in dem Spalt zwischen einer harten Auftragerolle und einer verformbaren Dosierrolle, die gegenläufig rotieren.EP 0 365 640 A2 discloses a process to the public in which a liquid containing microcapsules is also transferred on one side to a paper, in the gap between a hard application roll and a deformable one Metering rollers that rotate in opposite directions.

Aufgabe der Erfindung war es, ein Verfahren zur Verfügung zu stellen, das die Nachteile des Stands der Technik nicht oder zumindest nicht in dem Umfange aufweist und das insbesondere das Durchschlagen des jeweiligen Beschichtungsgutes verhindert. The object of the invention was to provide a method which has the disadvantages of State of the art not or at least not to the extent and that in particular preventing the coating material from striking through.

Gelöst wird diese Aufgabe durch ein Verfahren, wie es in dem Anspruch 1 dargestellt ist. Anspruch 2 beschreibt eine zweite Ausführungsform des Verfahrens, das sich von dem ersteren nur dadurch unterscheidet, daß eine Gummiwalze weggelassen ist, d.h., der Auftrag erfolgt direkt mit einer gleichläufigen Rasterwalze. Die folgenden Unteransprüche stellen vorteilhafte Weiterbildungen dar.This object is achieved by a method as set out in claim 1. Claim 2 describes a second embodiment of the method, which differs from that distinguishes the former only in that a rubber roller is omitted, i.e. the Application takes place directly with an anilox roller running in the same direction. The following subclaims represent advantageous developments.

Demgemäß besteht das Verfahren zur gleichzeitigen Beaufschlagung der Oberseite und der Unterseite einer Papierträgerbahn mit jeweils einem niedrigviskosen Beschichtungsgut aus im folgenden aufgeführten Merkmalen.
Die Papierträgerbahn wird durch den Spalt zwischen zwei gegenläufigen Gummiwalzen geführt, der -200 µm bis -10 µm, insbesondere -50 µm bis -10 µm, beträgt.
Dabei wird die Oberseite der Papierträgerbahn mit dem ersten Beschichtungsgut mittels der ersten Gummiwalze beaufschlagt. Auf die erste Gummiwalze wird zuvor das erste Beschichtungsgut von einer ersten zu der ersten Gummiwalze gleichläufigen Rasterwalze übertragen, die ihrerseits mittels einer Angießvorrichtung mit dem ersten Beschichtungsgut versorgt wird.
Die Unterseite der Papierträgerbahn wird parallel mit dem zweiten Beschichtungsgut mittels einer zweiten Gummiwalze beaufschlagt wird, wobei auf die zweite Gummiwalze das zweite Beschichtungsgut von einer zweiten zu der zweiten Gummiwalze gleichläufigen Rasterwalze übertragen wird. Ebenfalls wird die zweite Rasterwalze mit dem zweiten Beschichtungsgut mittels einer weiteren Angießvorrichtung versorgt.
Die erste Rasterwalze und die zweite Rasterwalze werden insbesondere mit einer Relativgeschwindigkeit von 50 % bis 150 %, vorzugsweise 90 % bis 135 %, gleichläufig zur ersten und zur zweiten Gummiwalze betrieben.Accordingly, the method for simultaneously applying the top and bottom of a paper carrier web each with a low-viscosity coating material consists of the features listed below.
The paper carrier web is guided through the gap between two counter-rotating rubber rollers, which is -200 µm to -10 µm, in particular -50 µm to -10 µm.
The first coating material is applied to the top of the paper carrier web by means of the first rubber roller. The first coating material is transferred beforehand to the first rubber roller from a first anilox roller which runs in the same direction as the first rubber roller and which in turn is supplied with the first coating material by means of a sprue device.
The second coating material is applied in parallel to the underside of the paper carrier web by means of a second rubber roller, the second coating material being transferred to the second rubber roller by a second anilox roller which runs in the same direction as the second rubber roller. The second anilox roller is also supplied with the second coating material by means of a further pouring device.
The first anilox roller and the second anilox roller are operated in particular at a relative speed of 50% to 150%, preferably 90% to 135%, in the same direction as the first and second rubber rollers.

In einem alternativen Verfahren zur gleichzeitigen Beaufschlagung der Oberseite und der Unterseite einer Papierträgerbahn mit jeweils einem flüssigen Beschichtungsgut wird die Papierträgerbahn durch den Spalt zwischen einer Gummiwalze und einer zu der Gummiwalze gleichläufigen zweiten Rasterwalze geführt, wobei der Spalt zwischen Gummiwalze und Rasterwalze -200 µm bis -10 µm, insbesondere -50 µm bis -10 µm, beträgt.
Die Oberseite der Papierträgerbahn wird über die Gummiwalze mit dem ersten Beschichtungsgut beaufschlagt. Auf die Gummiwalze wird das erste Beschichtungsgut von einer ersten zu der ersten Gummiwalze gleichläufigen Rasterwalze übertragen, die ihrerseits von einer Angießvorrichtung das erste Beschichtungsgut empfängt.
Die Unterseite der Papierträgerbahn wird über-die zweite Rasterwalze, auf die das zweite Beschichtungsgut ebenfalls über eine weitere Angießvorrichtung aufgetragen wird, mit dem zweiten Beschichtungsgut beaufschlagt.
Die erste Rasterwalze und die zweite Rasterwalze werden insbesondere mit einer Relativgeschwindigkeit von 50 % bis 150 %, vorzugsweise 90 % bis 135 %, gleichläufig zur Gummiwalze und gegenläufig zu der Trägerbahn betrieben.In an alternative method for simultaneously applying a liquid coating material to the top and bottom of a paper carrier web, the paper carrier web is guided through the gap between a rubber roller and a second anilox roller that is parallel to the rubber roller, the gap between rubber roller and anilox roller being -200 μm to - 10 µm, in particular -50 µm to -10 µm, is.
The top of the paper carrier web is loaded with the first coating material via the rubber roller. The first coating material is transferred to the rubber roller from a first anilox roller which runs in the same direction as the first rubber roller and which in turn receives the first coating material from a sprue device.
The underside of the paper carrier web is acted upon by the second coating material via the second anilox roller, to which the second coating material is also applied via a further sprue device.
The first anilox roller and the second anilox roller are operated in particular at a relative speed of 50% to 150%, preferably 90% to 135%, in the same direction as the rubber roller and in the opposite direction to the carrier web.

Die in dem Verfahren eingesetzten Gummiwalzen weisen vorteilhafterweise eine Shore-Härte von 40 bis 90, insbesondere 40 bis 60 auf.The rubber rollers used in the process advantageously have a Shore hardness from 40 to 90, in particular 40 to 60.

Die Rasterwalzen haben bevorzugt eine 18 - 80er, insbesondere eine 36er - 60er Teilung.The anilox rollers preferably have an 18-80, in particular a 36-60 division.

Alle Walzen, sowohl die Gummiwalzen als auch die Rasterwalzen, werden in einer vorteilhaften Weiterbildung des Verfahrens separat angetrieben.All rollers, both the rubber rollers and the anilox rollers, are in one advantageous development of the method driven separately.

Die Rasterwalzen werden mit einem geschlossenen Angießkasten versehen, in den die Beschichtungsmedien mit einem Druck von 0,05 bar bis 0,5 bar, vorzugsweise 0,1 bar bis 0,3 bar, eingespeist werden. Die Druckangaben entsprechen dabei jeweils dem vorliegenden Kammerdruck.The anilox rollers are provided with a closed sprue box into which the Coating media with a pressure of 0.05 bar to 0.5 bar, preferably 0.1 bar to 0.3 bar can be fed. The pressure specifications correspond to that present chamber pressure.

Besonders vorteilhaft stellt sich das Verfahren dar, wenn das erste Beschichtungsgut eine wäßrige Primer-Dispersion ist und das zweite Beschichtungsgut von einer wäßrigen Release-Dispersion gebildet ist.The method is particularly advantageous if the first coating material is a is aqueous primer dispersion and the second coating material from an aqueous Release dispersion is formed.

Ebenfalls kann vorteilhaft als erstes Beschichtungsgut eine wäßrige Release-Dispersion einseitig aufgetragen werden, wenn gleichzeitig das zweite Beschichtungsgut von einer wäßrigen Nachstrichbeschichtung gebildet ist.An aqueous release dispersion can also advantageously be used as the first coating material can be applied on one side if at the same time the second coating material from one aqueous post-coating is formed.

Für die Beschichtung von Papierträgerbahnen für die Klebebandherstellung, insbesondere gekreppten Papierträgerbahnen, ist das erfindungsgemäße Verfahren hervorragend geeignet. Überraschenderweise zeigt sich, daß die bekannten Nachteile der her kömmlichen Beschichtungsverfahren nicht auftreten. Bei dem erfindungsgemäßen Verfahren werden die Beschichtungsgüter bedingt durch den Walzenspalt mit leichtem Überdruck an die Papieroberfläche angetragen. Dadurch, daß gleichzeitig auf beiden Seiten der Papieroberfläche ein Beschichtungsgut mit Überdruck angetragen wird, wird ein Massedurchschlag zuverlässig verhindert.For the coating of paper carrier webs for the production of adhesive tape, in particular creped paper carrier webs, the inventive method is excellent suitable. Surprisingly, it turns out that the known disadvantages of ago conventional coating processes do not occur. In the method according to the invention are the coating goods due to the nip with light Pressure applied to the paper surface. Because simultaneously on both sides If a coating material with excess pressure is applied to the paper surface, a mass breakdown occurs reliably prevented.

Durch das Verhältnis der Drücke -sprich die Voreinstellung des Walzenspaltes und dem Füllgrad der Rasterwalzen (in Abhängigkeit vom Druck der Befüllung des Beschichtungsmediums) läßt sich die jeweilige Eindringtiefe der Beschichtungsgüter regeln. Damit sind konstante Auftragsmengen gewährleistet, und es eröffnet sich die Möglichkeit, mit minimalen Auftragsmengen zu arbeiten.Due to the ratio of the pressures - i.e. the presetting of the nip and the Degree of filling of the anilox rollers (depending on the pressure of the filling of the Coating medium), the respective penetration depth of the coating material can be regulated. This ensures constant order quantities and opens up the possibility of to work with minimal order quantities.

Ein weiterer Vorteil des offenbarten Verfahrens liegt darin, daß im Falle von beidseitig wäßrigen Beschichtungsgütern eine hervorragende Planlage des Papiers erhalten wird, die über die Beschichtungsmenge reguliert werden kann. Der Grund dafür liegt darin, daß das Papier gleichzeitig von beiden Seiten mit den Beschichtungsgütern beaufschlagt und in einem nachgeschalteten Schwebedüsentrockner auf der Oberseite und der Unterseite der Papierträgerbahn eine identische Trocknungsgeschwindigkeit voreingestellt wird. Quellungsvorgänge in den Fasern, das Lösen von Spannungen in den Oberflächen beziehungsweise das Erzeugen von neuen Spannungen (zum Beispiel Schrumpf durch Verhomung von Resthemicellulose und anderen amorphen Bestandteilen) erfolgen gleichsinnig auf Ober- und Unterseite des Papiers.
Die verbesserte Planlage wirkt sich wiederum positiv auf die Beschichtungsqualität der Klebmasse aus.Another advantage of the disclosed method is that, in the case of coating materials which are aqueous on both sides, an excellent flatness of the paper is obtained which can be regulated by the amount of coating. The reason for this is that the paper is subjected to the coating goods from both sides at the same time and an identical drying speed is preset in a downstream floating nozzle dryer on the top and bottom of the paper carrier web. Swelling processes in the fibers, the release of tensions in the surfaces or the creation of new tensions (e.g. shrinkage due to the entanglement of residual hemicellulose and other amorphous constituents) take place in the same direction on the top and bottom of the paper.
The improved flatness in turn has a positive effect on the coating quality of the adhesive.

Insbesondere wenn die Oberseite der Papierträgerbahn mit einer wäßrigen Primerdispersion und die Unterseite mit einer wäßrigen Release-Dispersion beaufschlagt wird, ergeben sich hervorragende Ergebnisse. Bedingt durch das gleichzeitige Beschichten an einem Auftragspunkt auf der Oberseite und auf der Unterseite erfolgt ein gleichzeitiges Benetzen (Wasser) der Papierträgerbahn von beiden Seiten und ein Einbau von Feststoff in das Papier. Es bildet sich innerhalb der Papierdicke eine Grenzschicht zwischen Lack- und Vorstrichdispersion ohne Vermischung. Damit ist das beschriebene unerwünschte Durchschlagen der Beschichtungsgüter ausgeschlossen. Especially when the top of the paper backing with an aqueous primer dispersion and an aqueous release dispersion is applied to the underside excellent results. Due to the simultaneous coating on one The application point on the top and on the bottom is wetted simultaneously (Water) of the paper carrier web from both sides and an installation of solid matter in the Paper. A boundary layer forms between the lacquer and the inside of the paper thickness Primer dispersion without mixing. So that is undesirable described Penetration of the coating goods excluded.

Nach dem Beschichtungsvorgang der Papierträgerbahn 1 in dem Walzenspalt 23 wird diese über ein berührungslos arbeitenden Bahnführungselement 5 einem nicht weiter beschriebenem Schwebedüsentrockner zugeführt.
Anschließend erfolgt die weitere Verarbeitung der Papierträgerbahn in Form der Beschichtung mit bekannten lösungsmittelbasierten Klebersystemen in herkömmlichen Auftragsverfahren.After the coating process of the paper carrier web 1 in the nip 23, it is fed via a non-contact web guiding element 5 to a floating nozzle dryer which is not further described.
The paper carrier web is then further processed in the form of a coating with known solvent-based adhesive systems in conventional application processes.

Nach Figur 2 wird die Papierträgerbahn 1 in den Walzenspalt 23 geführt, der von einer zur Papierträgerbahn 1 gleichläufig betriebenen Gummiwalze 22 und von einer ersten, gegenläufig zur Papierträgerbahn 1 und gleichläufig zu der Gummiwalze 22 betriebenen Rasterwalze 31 gebildet wird.According to Figure 2, the paper carrier web 1 is guided into the nip 23, which from one to the Paper carrier web 1 rubber roller 22 operated in the same direction and by a first, counter to the paper carrier web 1 and operated in the same direction to the rubber roller 22 Anilox roller 31 is formed.

Die Rasterwalze 31 beschichtet hierbei direkt die Unterseite der Papierträgerbahn 1 mit einer wäßrigen Primerdispersion, wobei die Rasterwalze 31 über eine erste Angießvorrichtung 41 mit dem Beschichtungsgut versorgt wird.The anilox roller 31 directly coats the underside of the paper carrier web 1 an aqueous primer dispersion, the anilox roller 31 via a first sprue 41 is supplied with the coating material.

Entsprechend dem oben beschriebenen Verfahren erfolgt der Auftrag der wäßrigen Lackdispersion ebenfalls über eine Gummiwalze 22, die über eine Rasterwalze 32 mit der Lackdispersion versorgt wird, die ihrerseits das Beschichtungsgut aus einer zweiten Angießvorrichtung 42 empfängt.The aqueous solution is applied in accordance with the process described above Lacquer dispersion also via a rubber roller 22, which via a screen roller 32 with the Paint dispersion is supplied, which in turn the coating material from a second Gating device 42 receives.

Im folgenden soll das Verfahren anhand dreier Beispiele näher gekennzeichnet werden, ohne in irgendeiner Weise einschränkend wirken zu sollen.In the following, the process will be characterized using three examples, without being restrictive in any way.

Beispiel 1: Dünne Papierträgerbahn, und zwar ein Flachkreppträger, Dicke der Papierträgerbahn: 150 µmExample 1: Thin paper carrier web, namely a flat crepe carrier, Thickness of the paper carrier web: 150 µm

Die Papierträgerbahn wurde in einem vorgeschalteten Arbeitsgang mit einer Imprägnierung, basierend auf einem SBR-Latex, imprägniert. Die Imprägnierung erfolgte auf einer konventionellen Imprägnieranlage, die von verschiedenen Lieferanten geliefert wird. Hier kam eine Imprägnieranlage von VITS (Erkrath) zum Einsatz. Die Imprägnierung erfolgte im Tauchverfahren, mit anschließendem Abquetschen des Überschusses in einem Quetschwerk. Der Imprägniereintrag erfolgte bis zur vollständigen Absättigung des Papiers. The paper carrier web was treated with an impregnation, based on an SBR latex, impregnated. The impregnation was carried out on a conventional impregnation system, which is supplied by various suppliers. Here an impregnation system from VITS (Erkrath) was used. The impregnation took place in the Immersion process, followed by squeezing off the excess in one Squeezer. The impregnation was made until the paper was completely saturated.

Die Lage dieser Grenzschicht im Papier ist durch das in der Erfindung gewählte Verfahren gezielt beeinflußbar. Insbesondere die Auswahl der Rasterwalzen, des gewählten Kammerdruckes, der Übertragungswalzen, der Relativgeschwindigkeit der Walzen, aber auch andere Parameter bestimmen diese Grenzschicht.
Damit wird die Beschichtungsdicke, also die Dicke der Schicht, in die das jeweilige Beschichtungsgut eindringen soll, eben von dem jeweiligen Beschichtungsgut definiert.The position of this boundary layer in the paper can be influenced in a targeted manner by the method chosen in the invention. In particular the selection of the anilox rollers, the selected chamber pressure, the transfer rollers, the relative speed of the rollers, but also other parameters determine this boundary layer.
The coating thickness, that is to say the thickness of the layer into which the respective coating material is to penetrate, is thus precisely defined by the respective coating material.

Ein weiterer Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß das Einrollen der Kanten der beschichteten Papierträgerbahn vermieden wird, was bei einer einseitigen Benetzung nicht unterdrückt werden kann.Another advantage of the method according to the invention is that the curling of the Edges of the coated paper carrier web are avoided, which is a one-sided Wetting cannot be suppressed.

In der Figur 1 ist das besonders vorteilhaft ausgebildete Verfahren nach Anspruch 1 und in Figur 2 das nach Anspruch 2 dargestellt.FIG. 1 shows the particularly advantageous method according to claim 1 and in Figure 2 shown according to claim 2.

Gemäß Figur 1 wird die Papierträgerbahn 1 geradlinig in den Spalt 23 zwischen zwei gegenläufigen Gummiwalzen 21, 22 geführt. Die Gummiwalzen 21, 22 sind auf einem nicht näher dargestellten Gestell montiert, wobei über einen entsprechenden Verstellmechanismus die Spaltbreite zwischen den Gummiwalzen 21, 22 voreingestellt werden kann.According to Figure 1, the paper carrier web 1 is rectilinear in the gap 23 between two opposed rubber rollers 21, 22 out. The rubber rollers 21, 22 are not on one Mounted frame shown, with a corresponding adjustment mechanism the gap width between the rubber rollers 21, 22 can be preset can.

Über die erste Gummiwalze 21 wird die Unterseite der Papierträgerbahn 1 mit einer wäßrigen Primerdispersion beaufschlagt. Die Gummiwalze 21 selbst übernimmt über eine erste Rasterwalze 31, die gleichläufig zu der Gummiwalze 21 angetrieben wird, die wäßrige Primerdispersion. Eine erste Angießvorrichtung 41, die vorteilhafterweise mit einem leichten Überdruck von 0,05 bar bis 0,5 bar betrieben wird, beschichtet die Rasterwalze 31.About the first rubber roller 21, the underside of the paper carrier web 1 with a applied aqueous primer dispersion. The rubber roller 21 itself takes over first anilox roller 31, which is driven in parallel with the rubber roller 21, the aqueous Primer dispersion. A first sprue 41, advantageously with a light If the excess pressure is operated from 0.05 bar to 0.5 bar, the anilox roller 31 is coated.

Über die zweite Gummiwalze 22 wird die Oberseite der Papierträgerbahn 1 mit einer wäßrigen Lackdispersion beaufschlagt. Die Gummiwalze 22 und die zu dieser gleichläufig betriebene Rasterwalze 32 beziehen das Beschichtungsgut ebenfalls aus einer zweiten, vorteilhafterweise mit einem leichten Überdruck von 0,05 bar bis 0,5 bar betriebenen Angießvorrichtung 42. About the second rubber roller 22, the top of the paper carrier web 1 with a applied aqueous paint dispersion. The rubber roller 22 and the same to this operated anilox roller 32 also obtain the coating material from a second, advantageously operated with a slight excess pressure of 0.05 bar to 0.5 bar Gating device 42.

Die beidseitige Beschichtung nach dem erfindungsgemäßen Verfahren erfolgte im Doppelauftragswerk mit folgenden flüssigen Medien:The coating on both sides by the process according to the invention was carried out in a double application unit with the following liquid media:

Erstes Beschichtungsgut: wäßrige PrimerdispersionFirst coating material: aqueous primer dispersion Gepfropfter NaturkautschuklatexGrafted natural rubber latex

Viskositätviscosity Newton'sches Fließverhalten
Fordauslaufbecher mit 4 mm Düse: 16 ± 1 sec.Newtonian flow behavior
Ford cup with 4 mm nozzle: 16 ± 1 sec. Masseauftragapplication rate 1,5 g / m2 Trockenmasse1.5 g / m 2 dry matter

Zweites Beschichtungsgut: wäßrige Lackdispersion (Releaselack)Second coating material: aqueous lacquer dispersion (release lacquer)

Mischung von Synthese-Kautschuklatex mit Trennemulsionen auf Basis Acrylat beziehungsweise Copolymer aus Styrol und Maleinsäureamid Viskosität Strukturviskoses Fließverhalten,
600 mPa*s bei 0,1 1/s
70 mPa*s bei 100 1/s und 23 °C Masseauftrag 6 g / m2 Trockenmasse Mixture of synthetic rubber latex with release emulsions based on acrylate or copolymer of styrene and maleic acid amide viscosity Structurally viscous flow behavior,
600 mPa * s at 0.1 1 / s
70 mPa * s at 100 1 / s and 23 ° C application rate 6 g / m 2 dry matter

Die erfindungsgemäße Anlage war eine Technikumsanlage zur Ermittlung der in der Beschreibung zitierten Parameter. Dabei erfolgte der Aufbau der Walzen im Walzenstuhl eines 5-Walzen-Auftragswerkes, die anschließende Trocknung in einem Schwebedüsentrockner.The system according to the invention was a pilot plant system for determining the in the Description cited parameters. The rollers were assembled in the roller mill of a 5-roll applicator, the subsequent drying in one The float nozzle dryer.

Auf der Primerdispersionsseite wurden dabei folgende, in der Tabelle angegebene Verfahrensparameter ausgewählt: Kammerdruck im Angießkasten 0,2 bar Rasterwalze 60er Teilung Durchmesser Rasterwalze 200 mm Relativgeschwindigkeit zur Gummiwalze 135% Gummiwalze 55 Shore, PUR Durchmesser Gummiwalze 200 mm Geschwindigkeit der Gummiwalze Bahngeschwindigkeit bis 400 m/min The following process parameters specified in the table were selected on the primer dispersion side: Chamber pressure in the sprue box 0.2 bar anilox roller 1960s division Anilox roller diameter 200 mm Relative speed to the rubber roller 135% squeegee 55 Shore, PUR Rubber roller diameter 200 mm Speed of the rubber roller Web speed up to 400 m / min

Auf der Seite der Lackdispersion wurden folgende Anlagenparameter verwirklicht: Kammerdruck im Angießkasten 0,1 bar Rasterwalze 38er Teilung Durchmesser Rasterwalze 200 mm Relativgeschwindigkeit zur Gummiwalze 135% Gummiwalze 55 Shore, PUR Durchmesser Gummiwalze 200 mm Geschwindigkeit der Gummiwalze Bahngeschwindigkeit bis 400 m/min The following system parameters were implemented on the coating dispersion side: Chamber pressure in the sprue box 0.1 bar anilox roller 38 division Anilox roller diameter 200 mm Relative speed to the rubber roller 135% squeegee 55 Shore, PUR Rubber roller diameter 200 mm Speed of the rubber roller Web speed up to 400 m / min

Der Spalt zwischen den Gummiwalzen wurde auf 80 µm voreingestellt.The gap between the rubber rollers was preset to 80 µm.

Nach entsprechender Durchführung der Beschichtung wurde ein Massedurchschlag nicht beobachtet, die Masseaufträge trocken lagen ungefähr 30% niedriger als bei herkömmlichen Verfahren.After the coating had been carried out accordingly, there was no mass breakdown observed, the bulk orders were about 30% lower than conventional ones Method.

Der so ausgerüstete Träger wurde mit 50 g/m2 (Trockensubstanz) einer lösungsmittelbasierten Naturkautschukklebemasse beschichtet. Es handelt sich dabei um eine ESHnachvernetzbare Klebemasse, die standardmäßig für die Kreppbänder eingesetzt wird, bestehend aus Naturkautschuk, Klebeharzen und Füllstoffen.The carrier thus finished was coated with 50 g / m 2 (dry substance) of a solvent-based natural rubber adhesive. It is an ESH post-crosslinkable adhesive that is used as standard for the masking tapes, consisting of natural rubber, adhesive resins and fillers.

Klebtechnische Standarddaten (insbesondere Abrollkraft) und anwendungstechnische Ergebnisse waren hervorragend:Standard adhesive data (especially unwind force) and application technology data The results were excellent:

Alle Messungen wurden bei 23 °C, 50% relativer Luftfeuchte durchgeführt. Klebkraft Stahl 3,9 N / cm Abzugsgeschwindigkeit 300 mm/min Anlehnung an AFERA 4001 Klebkraft Rückseite 1,8 N / cm dito AFERA 4001 Abrollkraft 1,0 N / cm Abrollgeschwindigkeit 30 m/min AFERA 4013 Höchstzugkraft 42 N / cm Prüfgeschwindigkeit300 mm/min AFERA 4004 Reißdehnung 10 % AFERA 4005 All measurements were carried out at 23 ° C, 50% relative humidity. Adhesive strength steel 3.9 N / cm Take-off speed 300 mm / min Based on AFERA 4001 Adhesion back 1.8 N / cm dito AFERA 4001 unwind 1.0 N / cm Unwind speed 30 m / min AFERA 4013 ultimate tensile strength 42 N / cm Test speed 300 mm / min AFERA 4004 elongation at break 10% AFERA 4005

Das nach dem erfindungsgemäßen Verfahren hergestellte Produkt eignete sich nach den Ergebnissen der anwendungstechnischen Untersuchung sehr gut als Malerabdeckband. Insbesondere erwies es sich als hervorragend beständig gegenüber Dispersionsfarben Beim Streifenabzugstest von auf Stahlblech verklebten und mit handelsüblicher Dispersionsfarbe bestrichenen Musterstreifen kam es in keinem Fall zum Spalten des Produkts, weder nach 5, 10, 15 noch nach 20 min Einwirkzeit der Dispersionsfarbe.The product produced by the process according to the invention was suitable according to the Results of the application-technical examination very well as a masking tape. In particular, it proved to be extremely resistant to emulsion paints Strip peel test of glued on sheet steel and with commercially available emulsion paint The streaked sample strips never split the product, neither after 5, 10, 15 after 20 minutes of exposure to the emulsion paint.

Das Produkt ließ sich reißerfrei von verschiedenen Untergründen, auch nach längerer Verklebungszeit und unter extremen Abzugsbedingungen (extrem schnell, extreme Spannung), wieder entfernen. Explizit getestet wurden Glas und PVC mit Verklebungsdauem von bis zu 24 Stunden.The product could be ripped off various substrates, even after a longer period Bonding time and under extreme peeling conditions (extremely fast, extreme Voltage), remove again. Glass and PVC with bonding times were explicitly tested up to 24 hours.

Beispiel 2: Herstellung eines Klebebandes auf der Basis von Transparentpapier, Pergamentpapier oder hochverdichtetem Glassinepapier Example 2 : Production of an adhesive tape based on transparent paper, parchment paper or high-density glassine paper

Auch hier wurde die Primerdispersion und die Releaselackdispersion aus der wäßrigen Phase beschichtet.Here, too, the primer dispersion and the release lacquer dispersion were removed from the aqueous Phase coated.

Als Primer kam eine wäßrige Lösung eines handelsüblichen Polyvinylalkohols (Handelsname Mowiol der Firma Hoechst) zum Einsatz. Die Viskosität wurde eingestellt auf Fordauslaufbecher mit 4 mm Düse bei 18 ± 4 sec.An aqueous solution of a commercially available polyvinyl alcohol was used as the primer (Trade name Mowiol from Hoechst). The viscosity was set to Ford cup with 4 mm nozzle at 18 ± 4 sec.

In weiteren Versuchen wurden auch Primer auf Basis von Celloluseestern oder -ethem, Alginaten oder Galaktomannanen verwandt.In further experiments, primers based on cellulose esters or ethers, Alginates or galactomannans related.

Die Releasekomponente bestand aus der Mischung einer Polyvinylalkohollösung (s.o.) mit einer Silikontrennemulsion. Der Polyvinylalkohol übernimmt hierbei die Funktion des Filmbildners, die Silikonemulsion kann in der Menge auf die jeweils gewünschte Trennwirkung abgestimmt werden. Die Viskosität der Releasedispersion wurde auf Fordbecher mit 4 mm Auslaufdüse bei 18 ± 4 sec eingestellt.The release component consisted of the mixture of a polyvinyl alcohol solution (see above) a silicone release emulsion. The polyvinyl alcohol takes on the function of Film formers, the silicone emulsion in the amount of the desired separation effect be coordinated. The viscosity of the release dispersion was measured on Ford beakers 4 mm outlet nozzle set at 18 ± 4 sec.

Die so beschichteten Träger wurden unmittelbar danach mit einer lösemittelbasierten Acrylat-Klebemasse beschichtet. Es handelt sich um eine 38%ige lösungsmittelbasierende Acrylatklebemasse, die z.B. von der Fa. National Starch zu beziehen ist. Es wurde ein Klebemasseauftrag von 20 ± 2 g/m2 ausgeführt.The supports coated in this way were coated immediately afterwards with a solvent-based acrylate adhesive. It is a 38% solvent-based acrylic adhesive, which can be obtained from National Starch, for example. An adhesive composition of 20 ± 2 g / m 2 was carried out.

Als Beschichtungsanlage wurde dafür eine Kanalbeschichtungsanlage mit einem Knife-over-Roll-Auftragswerk eingesetzt.A channel coating system with a knife-over-roll applicator was used as the coating system used.

Die erfindungsgemäße Anlage war eine Technikumsanlage zur Ermittlung der in der Beschreibung zitierten Parameter. Dabei erfolgte der Aufbau der Walzen im Walzenstuhl eines 5-Walzen-Auftragswerkes, die anschließende Trocknung in einem Schwebedüsentrockner.The system according to the invention was a pilot plant system for determining the in the Description cited parameters. The rollers were assembled in the roller mill of a 5-roll applicator, the subsequent drying in one The float nozzle dryer.

Auf der Primerdispersionsseite wurden dabei folgende, in der Tabelle angegebene Verfahrensparameter ausgewählt: Kammerdruck im Angießkasten 0,15 bar Rasterwalze 60er Teilung Durchmesser Rasterwalze 200 mm Relativgeschwindigkeit zur Gummiwalze 135% Gummiwalze 55 Shore, PUR Durchmesser Gummiwalze 200 mm Geschwindigkeit der Gummiwalze Bahngeschwindigkeit bis 400 m/min The following process parameters specified in the table were selected on the primer dispersion side: Chamber pressure in the sprue box 0.15 bar anilox roller 1960s division Anilox roller diameter 200 mm Relative speed to the rubber roller 135% squeegee 55 Shore, PUR Rubber roller diameter 200 mm Speed of the rubber roller Web speed up to 400 m / min

Auf der Seite der Lackdispersion wurden folgende Anlagenparameter verwirklicht: Kammerdruck im Angießkasten 0,2 bar Rasterwalze 60er Teilung Durchmesser Rasterwalze 200 mm Relativgeschwindigkeit zur Gummiwalze 135% Gummiwalze 55 Shore, PUR Durchmesser Gummiwalze 200 mm Geschwindigkeit der Gummiwalze Bahngeschwindigkeit bis 400 m/min The following system parameters were implemented on the coating dispersion side: Chamber pressure in the sprue box 0.2 bar anilox roller 1960s division Anilox roller diameter 200 mm Relative speed to the rubber roller 135% squeegee 55 Shore, PUR Rubber roller diameter 200 mm Speed of the rubber roller Web speed up to 400 m / min

Der Spalt zwischen den Gummiwalzen wurde auf 20 um voreingestellt. The gap between the rubber rollers was preset to 20 µm.

Beispiel 3: Herstellung eines Klebebandes auf der Basis der im Beispiel 2 genannten Träger mit Acrylatdispersionsklebemasse Example 3 : Production of an adhesive tape on the basis of the carrier mentioned in Example 2 with acrylic dispersion adhesive

In einem weiteren Versuch wurde eine handelsübliche Acrylatdispersion (Handelsname PS 83D von Rohm und Haas) als Klebmasse eingesetzt. Die Dispersion wurde hierbei anstelle des Primers über das Primeraustragswerk appliziert. Beim Einsatz der Acrylatdispersion konnte auf die Verwendung des Primers verzichtet werden. Das so erhaltene Klebeband war recyclebar.In a further experiment, a commercially available acrylate dispersion (trade name PS 83D from Rohm and Haas) used as adhesive. The dispersion was used instead of the primer applied via the primer discharge mechanism. When using the acrylic dispersion it was possible to dispense with the use of the primer. The adhesive tape thus obtained was recyclable.

Der Acrylatdispersionsklebstoff wurde mit einer Viskosität von 200 - 600 mPa*s bei 30 1/s und 20 °C eingesetzt. Der Masseauftrag wurde mit 20 ± 1 g/ m2 eingestellt.
Der Releaselack wurde mit einer Viskosität von Fordauslaufbecher mit 4 mm Düse von 18 ± 4 sec eingestellt.The acrylic dispersion adhesive was used with a viscosity of 200 - 600 mPa * s at 30 1 / s and 20 ° C. The mass application was set at 20 ± 1 g / m 2 .
The release varnish was adjusted with a viscosity of Ford flow cup with 4 mm nozzle of 18 ± 4 sec.

Die erfindungsgemäße Anlage war eine Technikumsanlage zur Ermittlung der in der Beschreibung zitierten Parameter. Dabei erfolgte der Aufbau der Walzen im Walzenstuhl eines 5-Walzen-Auftragswerkes, die anschließende Trocknung in einem Schwebedüsentrockner.The system according to the invention was a pilot plant system for determining the in the Description cited parameters. The rollers were assembled in the roller mill of a 5-roll applicator, the subsequent drying in one The float nozzle dryer.

Dabei wurde hier die transferierende Primergummiwalze demontiert und die Primerrasterwalze im Gegenlauf zum Papierträger an diesen direkt angestellt (Beispiel Anlage 2)Here, the transferring primer rubber roller was dismantled and the Primary anilox roller in the opposite direction to the paper carrier directly against this (example Appendix 2)

Auf der Klebstoffdispersionsseite wurden dabei folgende, in der Tabelle angegebene Verfahrensparameter ausgewählt: Kammerdruck im Angießkasten 0,2 bar Rasterwalze 20er Teilung Durchmesser Rasterwalze 200 mm Relativgeschwindigkeit zur Gummiwalze 135% Gummiwalze 55 Shore, PUR Durchmesser Gummiwalze 200 mm Geschwindigkeit der Gummiwalze 75 % der Bahngeschwindigkeit bis 400 m/min The following process parameters specified in the table were selected on the adhesive dispersion side: Chamber pressure in the sprue box 0.2 bar anilox roller 20s division Anilox roller diameter 200 mm Relative speed to the rubber roller 135% squeegee 55 Shore, PUR Rubber roller diameter 200 mm Speed of the rubber roller 75% of the web speed up to 400 m / min

Auf der Seite der Releasedispersion wurden folgende Anlagenparameter verwirklicht: Kammerdruck im Angießkasten 0,2 bar Rasterwalze 60er Teilung Durchmesser Rasterwalze 200 mm Relativgeschwindigkeit zur Gummiwalze 135% Gummiwalze 55 Shore, PUR Durchmesser Gummiwalze 200 mm Geschwindigkeit der Gummiwalze Bahngeschwindigkeit bis 200 m/min The following system parameters were implemented on the release dispersion side: Chamber pressure in the sprue box 0.2 bar anilox roller 1960s division Anilox roller diameter 200 mm Relative speed to the rubber roller 135% squeegee 55 Shore, PUR Rubber roller diameter 200 mm Speed of the rubber roller Web speed up to 200 m / min

Der Spalt zwischen der Rasterwalze für die Klebstoffdispersion und der Releasegummiwalze wurde auf 50 µm voreingestellt.The gap between the anilox roller for the adhesive dispersion and the release rubber roller was preset to 50 µm.

Claims (11)

  1. Process for the simultaneous treatment of the top and bottom sides of a web of paper support each with a liquid coating material, characterized in that
    a) the web of paper support is passed through the gap between two rubber rollers rotating in the opposite direction,
    b)
    the top side of the web of paper support is treated with the first coating material by means of a first rubber roller,
    the first coating material is transferred by a first screen roller rotating in the same direction as the first rubber roller,
    the first coating material is applied to the first screen roller by means of a pouring device,
    c)
    tthe bottom side of the web of paper support is treated with the second coating material by means of a second rubber roller,
    the second coating material is transferred by a second screen roller rotating in the same direction as the second rubber roller,
    the second coating material is applied to the second screen roller by means of a pouring device.
  2. Process for the simultaneous treatment of the top and bottom sides of a web of paper support each with a liquid coating material, characterized in that
    a) the web of paper support is passed through the gap between a rubber roller and a second screen roller rotating in the same direction as the rubber roller,
    b)
    the top side of the web of paper support is treated with the first coating material by means of a rubber roller,
    the first coating material is transferred by a first screen roller rotating in the same direction as the first rubber roller,
    the first coating material is applied to the first screen roller by means of a pouring device,
    c)
    the bottom side of the web of paper support is treated with the second coating material by means of the second screen roller,
    the second coating material is applied to the second screen roller by means of a pouring device.
  3. Process according to Claims 1 or 2, characterized in that the gap between the two rubber rollers and between the rubber roller and screen roller is -200 µm to -10 µm, in particular -50 µm to -10 µm.
  4. Process according to Claims 1 to 3, characterized in that the rubber rollers have a Shore hardness from 40 to 90, in particular 40 to 60.
  5. Process according to Claims 1 to 4, characterized in that the screen rollers have a pitch of 18-80, in particular 36-60.
  6. Process according to Claims 1 to 5, characterized in that the rubber rollers and the screen rollers are each driven separately.
  7. Process according to Claims 1 to 6, characterized in that the screen rollers are each provided with a closed pouring box, into which the coating media are fed at a pressure of from 0.05 bar to 0.5 bar, preferably from 0.1 bar to 0.3 bar.
  8. Process according to Claims 1 to 7, characterized in that the first coating material is an aqueous primer dispersion or water and the second coating material is formed by an aqueous release dispersion.
  9. Process according to Claims 1 to 8, characterized in that the first coating material is an aqueous release dispersion and the second coating material is formed by an aqueous aftercoating dispersion.
  10. Process according to Claim 1, characterized in that the first screen roller and the second screen roller are driven at a relative speed of 50% to 150%, preferably 90% to 135%, in the same direction as the first rubber roller and second rubber roller.
  11. Process according to Claim 2, characterized in that the first screen roller and the second screen roller are driven at a relative speed of 50% to 150%, preferably 90% to 135%, in the same direction as the rubber roller and in the opposite direction to the web of paper support.
EP97113481A 1996-08-22 1997-08-05 Method of simultaneously coating the upper and lower sides of a paper substrate Expired - Lifetime EP0825298B1 (en)

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DE19633766 1996-08-22
DE19633766A DE19633766C1 (en) 1996-08-22 1996-08-22 Application of coating to both sides of a paper web

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EP0825298A3 EP0825298A3 (en) 1999-03-10
EP0825298B1 true EP0825298B1 (en) 2002-07-03

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DE9314280U1 (en) * 1993-09-22 1994-01-20 Jagenberg AG, 40476 Düsseldorf Device for coating a paper or cardboard web
EP0706833B1 (en) * 1994-04-28 2001-12-19 TAIYO TECHNO CO.,Ltd. Continuous painting method

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DE59707629D1 (en) 2002-08-08
US5869131A (en) 1999-02-09
EP0825298A2 (en) 1998-02-25
DE19633766C1 (en) 1997-11-20
EP0825298A3 (en) 1999-03-10

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