EP1314487B1 - Procédé de revêtement - Google Patents

Procédé de revêtement Download PDF

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Publication number
EP1314487B1
EP1314487B1 EP02024369A EP02024369A EP1314487B1 EP 1314487 B1 EP1314487 B1 EP 1314487B1 EP 02024369 A EP02024369 A EP 02024369A EP 02024369 A EP02024369 A EP 02024369A EP 1314487 B1 EP1314487 B1 EP 1314487B1
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EP
European Patent Office
Prior art keywords
substrate
roller
process according
lay
electrode
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EP02024369A
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German (de)
English (en)
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EP1314487A3 (fr
EP1314487A2 (fr
Inventor
Hermann Neuhaus-Steinmetz
Lars Guldbrandsen
Maren Klose
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Tesa SE
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Tesa SE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/14—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by electrical means

Definitions

  • the invention relates to a process for producing sheet-like, at least two-layered Products, in particular adhesive tapes with a carrier material, on the an adhesive is applied.
  • solvent-free acrylate-based adhesives have also been available can be further processed as a hot melt adhesive for adhesive tapes. Achieve this However, usually not the shear strengths such as acrylate, which in Solvent be coated solved. A major reason for this is that the viscosity The masses during processing must not be too high, otherwise the melting and coating on a carrier from an economic point of view too expensive is. The viscosity is essentially determined by the molecular length. Shorter chain molecules however, cause worse shear strengths. Also with a crosslinking of the glue after the coating, only a limited improvement is possible.
  • melting can be avoided if it does manages to mix the components of the mass without solvent, and if the hot mass feeds directly to a coating system.
  • mixing units for example extruder in question.
  • the rubber may only slightly be degraded, otherwise the product properties are impaired.
  • melting can be avoided by using solvents or in water polymerized masses inline to coat the solvent or withdrawing water.
  • Solvent or water can be, for example, via vacuum zones Remove in a suitable extruder.
  • slot slit nozzles For the coating of highly viscous masses slot slit nozzles are suitable. It shows that it is also suitable for highly viscous adhesive compositions as described above are. However, from a relatively small web speed air bubbles between the adhesive and the substrate to be coated, typically on a platen is coated, included.
  • Blowers suction nozzles and so-called vacuum boxes recommended and offered. With their help is to increase the pressure force of the mass against the substrate.
  • the maximum amount of charge on the substrate is relatively low, since it already on leaving the charging roller is reduced so far, by the out of the Charge density resulting electric field strength no longer ionization of the air takes place.
  • Foil production discloses a roller insulation in which electrical charges are applied to the insulator layer before the film is laid down in order to increase the contact pressure when the film is placed on the roller. If no charges are applied to the insulated roller, then electrostatic pressure forces are greatly weakened when placed with increasing thickness of the insulator layer. With the requisite insulator thicknesses required for the ceramic coatings specified herein for adequate high voltage strength, achievable bubble-free coating speeds are drastically reduced.
  • the leading of the substrate is done in particular via a second roller.
  • the substrates used are papers, films, non-wovens and release-coated materials such as release papers, films and the like.
  • the second roller also referred to as the application roller, may be provided with a rubber coating and is preferably pressed against the roller with a line pressure of 50 to 500 N / mm, in particular 100 to 200 N / mm.
  • the application roller preferably has a Shore hardness (A) of 40 to 100, in particular a Shore hardness of 60 to 80 shore (A).
  • the substrate is preferably fed to the roller so that the speed of the roller surface coincides with that of the substrate. However, if a reduction in thickness is desired with the decrease of the adhesive film, the substrate may also have a higher speed.
  • the roller is a steel roller, a chromium-plated steel roller, a rubber roller or a silicone rubber roller and / or the roller is made of elastic material.
  • the roller may have a smooth or a slightly textured surface.
  • the smooth roller may preferably have a chromium layer.
  • the chrome-plated steel roller can have a highly polished surface with a roughness R z ⁇ 0.02 ⁇ m.
  • the coating roller may also be rubberized, preferably with a rubber hardness of 40 to 100 shore (A), in particular with a hardness of 60 to 80 shore (A).
  • the roll cover can be made according to the prior art of EPDM, Viton or silicone rubber or other elastic materials.
  • the roller is temperature-controlled, namely preferably in a range from -10 ° C to 200 ° C, especially from 2 ° C to 50 ° C.
  • the invention relates to a method for producing sheet-like, at least two-layer products, in which one of an applicator device emerging mass as a layer under application of electrostatic charges on a web-shaped substrate is applied, which is guided on a transport device and in which the mass-coated substrate before leaving the Transport device is electrostatically neutralized, wherein the web-shaped substrate applied electrostatic charges before coating by means of a substrate electrode be so that the substrate is pressed onto the transport device.
  • the application device as Nozzle, in particular slot die, two- or multi-channel nozzle or adapter nozzle, designed.
  • the transport device is preferably with the emerging from the nozzle mass coated without contact.
  • the distance of the nozzle to the transport device may preferably 0.01 to 60 mm, in particular 1 to 30 mm.
  • the transport device is designed as a lay-on roller, which continues in particular earthed and / or tempered, and preferably in a range of -10 ° C to 200 ° C, most preferably in a range of 0 ° C to 180 ° C, especially from 2 ° C to 50 ° C.
  • the composition can be electrostatically charged by means of at least one charging electrode, referred to below as the laying electrode, which is located in particular above the transport device, preferably the laying roller, in the region of the contact line of the mass layer.
  • the laying electrode which is located in particular above the transport device, preferably the laying roller, in the region of the contact line of the mass layer.
  • the layer is pressed onto the substrate. Charges are applied to the ground on one side with the lay-on electrode.
  • On the surface of the transport device, preferably lay-on roller counter-charges are immediately established. From the resulting field acts a force on the mass plus substrate, which presses both layers on the transport device, preferably lay-on roll.
  • the substrate coated with the mass is electrostatically neutralized by means of at least one counter-charging electrode before leaving the transport device, preferably lay-on roller, wherein the counter-charging electrode in particular on the transport device, preferably lay-on roller, in the area is located between the support layer of the ground layer and the withdrawal line of the coated substrate.
  • electrostatic discharges may be avoided as a result of the application of charges by the lay-on electrode, by the application of reverse polarity counter-charges and suitable thickness, even before leaving the coated substrate from the preferred lay-up roll.
  • the counter-charging electrode is in the form of a "wire”, “knife” and / or Needle electrode “executed, which is arranged transversely to the web.
  • corona discharge may occur between the lay-up roll and the underside of the substrate, adversely affecting particularly anti-adhesive properties of the substrate.
  • the corona discharge transports charges of opposite polarity to the underside of the web as on the coating side. If such a web is subsequently neutralized with conventional active or passive discharge devices, the measurable electric field is eliminated, but thereafter very large, equally high charges of opposite polarity are present on the two sides. If the electrical conductivity of the layers between charges is low, uncontrollable discharges may occur in wound bales.
  • the substrate in order to stress the substrate slightly, the substrate should be placed with a pressure roller on the transport device, preferably lay-up roller, and / or removed with a take-off roller from the transport device, preferably lay-up roller. It is also advantageous to select a conductive elastic coating for the preferred pressure roller with which the substrate is placed on the preferably selected application roller. If a conductive coating can not be used for reasons of process technology, it is advantageous to discharge the roll shell electrostatically in a region in which it is not covered by the substrate. Otherwise, the roller surface can absorb more electrical charges with each revolution until uncontrolled discharge phenomena occur.
  • the substrate before the Coating electrostatically neutralized is formed from the substrate before the Coating electrostatically neutralized.
  • the electrical voltage of the transport device preferably lay-on roller, 1 to 40 kV, in particular 2 to 15 kV.
  • the Mass on the substrate before leaving the transport device preferably lay-on roller, crosslinked or polymerized, in particular by means of electron beams, UV rays, visible light or a combination thereof and / or thermal.
  • the substrate electrode formed from a plurality of electrodes, preferably needle, knife or wire electrodes, which are arranged one behind the other.
  • the substrate electrode between the pressure roller and the applicator arranged.
  • the substrate electrode instead of a pressure roller in the area over the support line of the substrate to the transport device, preferably lay-on roller, to arrange.
  • the substrate electrode can advantageously be connected to an electrical voltage the opposite polarity as the laydown electrode are applied, wherein the Height of voltage to be applied regardless of the level of voltage selected can be located on the Auflegelektrode.
  • the thickness of the coating Thinner than 300 microns, especially between 20 and 200 microns especially between 20 and 120 microns thick and / or softens on the entire substrate-contacting surface the transport device preferably not more than ⁇ 20% of the average, in particular not more than ⁇ 5%.
  • the coating has a low roughness and / or antiadhesive Has properties.
  • the coating in an area where he is not through the Substrate is covered to neutralize electrostatically. Otherwise this can be with everyone Turn more electrical charges absorb until uncontrolled discharge phenomena occur. But even smaller uncontrolled charges, in particular, if they are uneven, they have a negative influence on blistering between coating and substrate.
  • the coating is polyester, Teflon, Kapton, silicone rubber, polypropylene, cast resin or other materials with sufficient High voltage strength with low layer thickness.
  • a shrink tube via the transport device,
  • a lay-up roll drawn and shrunk, can be used.
  • the coating is applied in a preferred variant of the method in excess, is optionally cured, further this will hereinafter except for one desired very constant layer thickness removed and the final for a low roughness polished.
  • Another preferred variant is an electrical insulator coated electrically conductive conveyor belt on which the substrate for coating over a lay-up roll is guided, the cover preferably having thicknesses of between 20 microns and 300 microns and in particular thicknesses between 20 microns and 120 microns may have.
  • a thin conveyor belt made of an electrical insulator preferably with Thicknesses between 20 microns and 300 microns and in particular with thicknesses between 20 microns and 120 ⁇ m, on which the substrate is guided over a lay-up roller for coating, represents preferred variant.
  • Another preferred variant is a modification in which an auxiliary film, the after unwinding a bale between the electrical conductive transport device and the substrate is placed after stripping the coated substrate is wrapped by the auxiliary film back into a bale.
  • the method can be used excellently in applications in which the Substrate is a carrier material for an adhesive tape and / or the mass is an adhesive.
  • the method can also be used excellently in the use cases, if the substrate is a release liner for an adhesive tape and the mass is an adhesive is.
  • the substrate is a precursor consisting of release liner, adhesive and carrier, or a double-sided adhesive tape and the compound is an adhesive
  • discharge devices are always on the Side mounted on the charges caused by separation processes.
  • the delivered bales with the substrate already in the pre-process to drive electrostatically controlled, or the intermediate storage time due to sufficient electrical residual conductivities large enough for confluence of double charges to choose.
  • the time required can also be achieved by storage at elevated temperatures be shortened.
  • the coating may consist of one or more views and / or the substrate one or more layers, where it is advantageous, multi-layered Coatings with multi-channel or adapter nozzles produce.
  • a coating consisting of a first adhesive, a Carrier and a second adhesive, is discharged and the substrate is a release liner is.
  • the inventive method provides a solution for the set tasks.
  • a coating with a slot die on a substrate at sufficiently high web speeds possible without bubbles between the ground layer and the substrate are formed without further properties the quality of the product to be manufactured and without Special hazards arise for the operating personnel.
  • a particularly good wetting of the transport device, preferably roller, with the Substrate with low air inclusions can be achieved if the substrate with a Substrate electrode, instead of a pressure roller, in the area above the support line of the Substrates is pressed.
  • a good wetting, that is an almost complete squeezing out the air, is further promoted by a very smooth roller surface.
  • the existing gas space volume of bubbles between substrate and transport device in the region of charging electrodes in which one harmful to the release layer Ionization, in particular by the high electric fields of the ground electrode, can take place, reduces with the quality of wetting the transport device, preferably lay-up roll.
  • the on the transport device located substrate by means of irradiation device high-energy radiation, by means of electron beams (ES), UV or IR radiation, be networked.
  • ES electron beams
  • Typical irradiation devices which in the inventive design of the Method are used, provide linear cathode systems, scanner systems or multi-longitudinal cathode systems, if it is electron beam accelerator is.
  • the acceleration voltages are preferably in the range between 40 kV and 500 kV, in particular between 80 kV and 300 kV.
  • the dose rates range from 5 to 150 kGy, especially 15 to 90 kGy.
  • As UV crosslinking systems in particular one or more medium-pressure mercury lamps with a power of up to 240 W / cm per emitter can be used.
  • As cans preferably 10 to 300 mJ / cm 2 are set.
  • halogen lamps For crosslinking or polymerization with visible light, in particular halogen lamps be used.
  • release liners with antiadhesive coatings, on which Stick adhesives only slightly, be used.
  • the carrier materials of release liners typically consist of paper or plastics, such as PET, PP or PE.
  • the plastics used generally have good electrical Insulation properties and high breakdown electric field strengths.
  • release coatings are used for release liners. Often also so-called “Schiffde coatings” are used. By this is meant that the carrier is not 100% covered by the release coating. It has been found that with such release liners, a neutralization of the coated substrate must be carried out much more accurately than, for example, in PET or PP films with completely covering silicone coatings of 1.5 g / m 2 and more.
  • Double-sided tapes distinguish between the open and the covered tapes Side of the release liner.
  • the covered side of the release liner is after the unwinding of the roll with the composite of first adhesive layer, carrier and second adhesive layer covered.
  • For a trouble-free further processing after the Coating up to the application should have the release forces of the adhesive on the open smaller than or equal to, but at least not significantly larger than the separation forces be on the covered page, as it would otherwise reorientation of the release liner for other side can come.
  • graded release liners available. With them you can ensure that the covered side has significantly higher separation forces. In particular, in non-graded release liners damage to the open side in the production of a double-sided adhesive tape may be relatively low, if you want to avoid an exchange for an undamaged release liner.
  • the substrate may also be from the precursor from the first operation, namely a release liner, an adhesive layer and the carrier.
  • nonwoven fabrics As a substrate or carrier material, it is also possible to use all known textile carriers, such as woven, knitted or nonwoven fabrics, "nonwoven” being understood to mean at least textile fabrics according to EN 29092 (1988) and stitchbonded nonwovens and similar systems. Also, lamination fabrics and knitted fabrics can be used. Such spacer fabrics are disclosed in EP 0 071 212 B1. Spacer fabrics are mat-shaped laminates with a cover layer of a fibrous or filament nonwoven fabric, a backing layer and individual layers or tufts of retaining fibers present between these layers, which are needled through the particle layer distributed over the surface of the laminate body and interconnect the cover layer and the backing layer.
  • inert rock particles such as, for example, sand, gravel or the like
  • the holding fibers needled through the particle layer keep the cover layer and the underlayer spaced apart and are bonded to the cover layer and the underlayer.
  • Spacer fabric or knitted fabric are described inter alia in two articles, namely an article from the trade journal “kettenwirk-praxis 3/93", 1993, pages 59 to 63 “Raschel knitted spacer” and an article from the trade journal “kettenwirk-praxis 1/94", 1994, pages 73 to 76 “Raschel knitted spacer fabric” the contents of which are hereby incorporated by reference, and the content of which becomes part of this disclosure and invention.
  • Knitted fabrics are textile fabrics made of one or more threads or thread systems by stitching (thread grinding), in contrast to woven goods (Fabric), where the surface is crossed by crossing two thread systems (warp and wefts) and the nonwovens (fiber composites), in which a loose fibrous web solidified by heat, needling, sewing or by water jets becomes.
  • Knitted fabrics can be knitted fabrics in which the threads in the transverse direction through the Textile run, and in knitted fabrics, in which the threads run longitudinally through the textile. Due to their mesh structure, knitwear is in principle yielding, cuddly Textiles, because the stitches can stretch in length and width and the endeavor have to return to their starting position. They are very high quality material durable.
  • Nonwovens are particularly solid staple fiber webs, but also filament, Meltblown and spun nonwovens in question, which are usually additionally solidify.
  • Solidification methods are for nonwovens the mechanical, the thermal and the chemical hardening known. Become the fibers in mechanical consolidation usually by turbulence of the individual fibers, by meshing of fiber bundles or by sewing additional threads held together purely mechanically, so leave Adhesive (with binder) by thermal as well as chemical processes or cohesive (binder-free) fiber-to-fiber bonds.
  • Adhesive with binder
  • thermal by thermal as well as chemical processes or cohesive (binder-free) fiber-to-fiber bonds.
  • Nonwovens have proved to be particularly advantageous, in particular by over-stitching are solidified with separate threads or by meshing.
  • Such solidified nonwovens are produced, for example, on stitchbonding machines of the "Malivlies" type from Karl Meyer, formerly Malimo, and can be obtained, inter alia, from the companies Naue Fasertechnik and Techtex GmbH.
  • a Malivlies is characterized in that a cross-fiber fleece is solidified by the formation of stitches of fibers of the fleece.
  • a nonwoven type Kunitvlies or Multiknitvlies can also be used as a carrier.
  • a Kunitvlies is characterized in that it results from the processing of a longitudinally oriented nonwoven fabric to a fabric having on one side mesh and on the other mesh webs or pile fiber pleats, but has neither threads nor prefabricated fabrics.
  • nonwoven fabric has been produced for example for some time on stitchbonding machines of the "Kunitvlies" type from Karl Mayer.
  • Another characteristic feature of this fleece is that it can absorb high tensile forces in the longitudinal direction as a longitudinal fiber fleece.
  • a Multiknitvlies is characterized over the Kunitvlies characterized in that the fleece by the piercing both sides with needles undergoes solidification both on the top and on the bottom.
  • sewing nonwovens are suitable as a precursor to form an adhesive tape.
  • a stitchbonded web is formed from a nonwoven material having a plurality of seams running parallel to one another. These seams are created by sewing or stitching of continuous textile threads. For this type of nonwoven stitching machines of the type "Maliwatt" the company Karl Mayer, formerly Malimo, known.
  • a staple fiber fleece which is preconsolidated by mechanical processing in the first step or which is a wet fleece, which was hydrodynamically laid, wherein between 2% and 50% of the fibers of the fleece are Schmelzfasem, in particular between 5% and 40% of the fibers of the fleece.
  • a nonwoven fabric is characterized in that the fibers are wet or, for example, a staple fiber nonwoven fabric is preconsolidated by the formation of loops of fibers of the nonwoven or by needling, sewing or air and / or water jet machining.
  • the heat-setting takes place, wherein the strength of the nonwoven fabric is further increased by the melting or melting of the melt fibers.
  • the solidification of the nonwoven backing can also be achieved without binders, for example by hot stamping with structured rolls, wherein properties such as strength, thickness, density, flexibility, etc. are determined by way of pressure, temperature, residence time and the embossing geometry. can be controlled.
  • Binders can be made in solid, liquid, foamed or pasty form. principal Dosage forms are variously possible, for example, solid binders as a powder for trickling, as a film or as a grid or in the form of binding fibers. liquid Binders are dissolved in water or organic solvents or applied as a dispersion.
  • binder dispersions are selected for adhesive bonding: Thermosets in the form of phenolic or melamine resin dispersions, elastomers as dispersions natural or synthetic rubbers or mostly dispersions of thermoplastics such as acrylates, vinyl acetates, polyurethanes, styrene-butadiene systems, PVC and the like. and their copolymers. Normally these are anionic or nonionic stabilized dispersions, but in special cases also cationic dispersions be beneficial.
  • binder application can be done according to the prior art and is for example in standard works of the coating or nonwoven technology such as "nonwovens” (Georg Thieme Verlag, Stuttgart, 1982) or “textile technology nonwovens production” (Employer group Inteltextil, Eschborn, 1996).
  • the one-sided spray application of a binder is available in order to change surface properties in a targeted manner.
  • the energy requirement for drying is also significantly reduced in such an operation. Since no nip rolls are required and the dispersions remain predominantly in the upper region of the nonwoven fabric, undesirable hardening and stiffening of the nonwoven fabric can be largely prevented.
  • binders of the order of 1% to 50%, in particular 3% to 20%, based on the weight of the nonwoven fabric.
  • the addition of the binder can already in the nonwoven production, in the mechanical Pre-consolidation or take place in a separate process step, which inline or off-line.
  • a state is created in which it becomes adhesive and adhesive connecting the fibers - this can be done during the drying of, for example, dispersions, but can also be achieved by heating, with over-surface or partial pressure application further variations are given.
  • the activation of the binder can in known drying channels, with a suitable choice of binder but also by means of infrared radiation, UV radiation, ultrasound, high-frequency radiation or the like respectively.
  • adhesive bonding Another special form of adhesive bonding is that activation the binder is made by dissolving or swelling. In principle, this can also be the fibers themselves or mixed Spezialfasem take over the function of the binder. However, for most polymeric fibers, such solvents are environmental are questionable or problematic in their handling, This method is rarely used.
  • the textile carrier As starting materials for the textile carrier are in particular polyester, polypropylene, Viscose or cotton fibers provided. The selection is not on the but it can, for the expert recognizable without having to be inventive, a variety of other fibers for the production of the fleece are used.
  • laminates and nets are used as support materials.
  • films for example, a polyolefin from the group of polyethylenes (for example HDPE, LDPE, MDPE, LLDPE, VLLDPE, copolymers of ethylene with polar Comonomers) and / or the group of polypropylenes (for example polypropylene homopolymers, Polypropylene random copolymers or polypropylene block copolymers), mono- or biaxially oriented polypropylene, polyester, PVC, PET, polystyrene, Polyamide or polyimide), foams, foam, for example of polyethylene and Polyurethane, foamed films and creped and uncreped papers.
  • the adhesive of the adhesive tape may consist of an adhesive based on solvent-containing natural rubber and acrylate adhesives. Adhesives based on acrylate dispersions are preferred, adhesives based on styrene-isoprene-styrene block copolymers being particularly preferred. These adhesive technologies are well known and used in the tape industry.
  • the application amount of the adhesive to the carrier material is preferably 15 to 60 g / sqm. In a further preferred embodiment, the layer order of 20 to 30 g / sqm adjusted.
  • the adhesive tapes can be produced by known processes. An overview conventional production methods can be found, for example, in "Coating Equipment”, Donatas Satas in Handbook of Pressure Sensitive Adhesive Technology, second edition, edited by Donatas Satas, Van Nostrand Reinhold New York pp. 767-808. The known methods for drying and cutting the tapes are also in Handbook of Pressure Sensitive Adhesive Technology, pp. 809-874.
  • the concentration can take place in suitably equipped boilers or extruders, in particular in the concomitant degassing, a degassing extruder is preferred.
  • Such an adhesive is set forth in DE 43 13 008 C2.
  • the K value is determined in particular in analogy to DIN 53 726.
  • the solution of the composition may be from 5 to 80% by weight, in particular from 30 to 70% by weight. Solvent included.
  • solvents are preferably used, in particular low boiling hydrocarbons, ketones, alcohols and / or esters.
  • single-screw, twin-screw or multi-screw extruders used with one or in particular two or more degassing units.
  • benzoin derivatives can be polymerized such as benzoin acrylate or benzoin methacrylate, acrylic or methacrylic acid esters.
  • benzoin derivatives are described in EP 0 578 151 A.
  • the acrylate-based adhesive can be UV-crosslinked.
  • Other types of networking but are also possible, for example, the electron beam crosslinking.
  • copolymers are used as self-adhesive compositions from (meth) acrylic acid and its esters having 1 to 25 C atoms, maleic, Fumaric and / or itaconic acid and / or their esters, substituted (meth) acrylamides, Maleic anhydride and other vinyl compounds, such as vinyl esters, in particular Vinyl acetate, vinyl alcohols and / or vinyl ethers used.
  • the residual solvent content should be below 1% by weight.
  • an adhesive which belongs to the group of natural rubbers or the synthetic rubbers or any blend of natural rubbers and / or synthetic rubbers, wherein the natural rubber or the Natural rubbers basically of all available qualities such as crepe, RSS, ADS, TSR or CV types, depending on the required level of purity and viscosity, and the synthetic rubber or synthetic rubbers from the group of random copolymerized styrene-butadiene rubbers (SBR), the butadiene rubbers (BR), the synthetic polyisoprenes (IR), butyl rubbers (IIR), halogenated butyl rubbers (XIIR), acrylate rubbers (ACM), ethylene vinyl acetate copolymers (EVA) and the polyurethanes and / or their blends can be selected.
  • SBR random copolymerized styrene-butadiene rubbers
  • BR butadiene rubbers
  • IR butyl rubbers
  • XIIR halogenated butyl rubbers
  • thermoplastic elastomers having a weight proportion of 10 to 50% by weight, based on the total elastomer content.
  • SIS styrene-isoprene-styrene
  • SBS styrene-butadiene-styrene
  • tackifying resins are all previously known and in the literature without exception can be used described adhesive resins. Mention may be made of the rosin resins, their disproportionated, hydrogenated, polymerized, esterified derivatives and salts, the aliphatic and aromatic hydrocarbon resins, terpene resins and terpene phenolic resins. Any combination of these and other resins may be used to adjust the properties of the resulting adhesive as desired. On the presentation of the state of knowledge in the "Handbook of Pressure Sensitive Adhesive Technology "by Donatas Satas (van Nostrand, 1989) is explicitly pointed out.
  • Hydrocarbon resin is a collective name for thermoplastic, colorless bis intense brown colored polymers with a molecular weight of generally ⁇ 2000.
  • coal tar resins In petroleum, Coal tar and terpene resins.
  • the most important coal tar resins are the coumarone-indene resins.
  • the hydrocarbon resins are made by polymerization of the raw materials recovered isolable unsaturated compounds.
  • hydrocarbon resins are also calculated by polymerization of monomers such as styrene or by polycondensation (certain formaldehyde resins) accessible polymers having a correspondingly low molecular weight.
  • Hydrocarbon resins are products with a softening range varying from ⁇ 0 ° C (at 20 ° C liquid hydrocarbon resins) to> 200 ° C in a wide range and a density of about 0.9 to 1.2 g / cm 3 .
  • Rosin resin is understood to be a natural resin derived from the crude resin of Conifers is obtained. There are three types of rosin: balsam resin Distillation residue of turpentine oil, root resin as extract of coniferous rootstocks and tall resin, the distillation residue of tall oil. The largest in terms of volume Meaning has balsam resin.
  • Rosin is a brittle, transparent product of red to brown color. It is insoluble in water, but soluble in many organic solvents such as (chlorinated) aliphatic and aromatic hydrocarbons, esters, ethers and ketones as well in vegetable and mineral oils.
  • the softening point of rosin is in Range of about 70 to 80 ° C.
  • Rosin is a mixture of about 90% resin acids and 10% neutral substances (fatty acid esters, terpene alcohols and hydrocarbons).
  • the most important rosin resin acids are unsaturated carboxylic acids of the general formula C20H3002, abietic, neoabietic, levopimaric, pimaric, isopimaric, and palustric acids, in addition to hydrogenated and dehydrated abietic acid.
  • the proportions of these acids vary depending on the provenance of the rosin.
  • plasticizer all known from the adhesive tape technology plasticizing Substances are used. These include, among others, the paraffinic and naphthenic oils, (functionalized) oligomers such as oligobutadienes, -isoprene, liquid Nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.
  • paraffinic and naphthenic oils such as oligobutadienes, -isoprene, liquid Nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.
  • thermally induced chemical crosslinking are all previously known thermally activated chemical crosslinkers such as accelerated sulfur or Sulfur donor systems, isocyanate systems, reactive melamine, formaldehyde and (optionally halogenated) phenol-formaldehyde resins or reactive phenolic resin or diisocyanate crosslinking systems with the corresponding activators, epoxidized Polyester and acrylate resins and their combinations used.
  • thermally activated chemical crosslinkers such as accelerated sulfur or Sulfur donor systems, isocyanate systems, reactive melamine, formaldehyde and (optionally halogenated) phenol-formaldehyde resins or reactive phenolic resin or diisocyanate crosslinking systems with the corresponding activators, epoxidized Polyester and acrylate resins and their combinations used.
  • the crosslinkers are preferably activated at temperatures above 50 ° C, in particular at temperatures of 100 ° C to 160 ° C, most preferably at temperatures of 110 ° C to 140 ° C.
  • the thermal excitation of the crosslinker can also be done by IR radiation or other high-energy electromagnetic alternating fields.
  • FIG. 1 shows a device in which an adhesive 8 is applied to a substrate 7. It thus shows a process for the production of adhesive tapes.
  • the device has a lay-on roller 6, in which case a grounded cooling roll is used.
  • the substrate 7 is a release liner, consisting of a monoaxially stretched polypropylene film, which was equipped on both sides with anti-adhesive silicone layers.
  • the substrate 7 is placed on the laying roller 6 via a pressure roller 4, which removes the air between the substrate 7 and the laying roller 6. Then, the last remaining air between the substrate 7 and the application roller 6 is largely removed by means of a substrate electrode 10 which is located between the pressure roller 4 and the coating nozzle 5.
  • the compound 8 here an adhesive, is applied via the coating nozzle 5, which is performed under the Auflegelektrode 1.
  • Figure 2 largely corresponds to Figure 1.
  • the pressure roller 4 for placing the substrate 7 on the lay-on roller 6 is not present.
  • the application of the substrate on the Laying roller 6 is done here by means of a substrate electrode 10 in the area above the Supporting line of the substrate 7 on the laying roller 6, whereby the air between the substrate 7 and roll-up 6 is removed particularly effectively.
  • An acrylate adhesive was polymerized in solvents and concentrated in an extruder.
  • resins were mixed with anti-aging agents and other additives.
  • the coating of the mass was carried out via a melt pump through a slot die (Extrusion Dies Inc./USA), with a coating width of 35 cm on a 70 micron thick polypropylene release film, which was placed with a pressure roller on a temperature-controlled application roller.
  • a 50 ⁇ m thick BOPP film was laminated in a subsequent laminating station. Thereafter, the laminate was wound up.
  • the lay-up roll in this case was equipped with a conductive very smooth polished chrome layer.
  • a needle electrode was used as a lay-on electrode (type: R130A from Eltex) used by a high voltage generator (type KNH34 / N supplied by Fa. Eltex).
  • a same second needle electrode (Counter charge electrode) in the area between the ground support line and the deduction line of the coated substrate applied by the lay-up roll and by a Another high voltage generator (type KNH34 / P from Eltex) with high voltage of supplied opposite polarity.
  • the layup electrode became at a web speed of 75 m / min with a negative high voltage of -15.8 kV applied.
  • the distance of the needle tips from the roll surface, the position of the electrode in the web running direction and the angle of inclination of the electrode to the tangent of the laying roll were optimized until no more bubbles between mass and substrate were watching.
  • the needle spacing was about 5 mm from the roll surface, the position of the electrode was about 8 mm in the web running direction behind the laying line and the angle of inclination to the tangent of the lay-up roll was 90 °.
  • the counter-charge electrode was covered with an opposite, ie positive, high voltage of +13.7 kV, so that the absolute value of the electrode current was equal to that of the lay-up electrode and the coated substrate was thus electrostatically neutralized before leaving the roll.
  • the distance of the needle tips of the counter-charging electrode from the roll surface was about 12 mm.
  • an active discharge electrode (type R51A from Eltex), which was supplied with 8 kV alternating current at a frequency of 50 Hz from a power supply unit (Eltex type: ES52), was additionally supplied over the detachment line of the web from the lay-up roll.
  • the blistering was determined on the one hand inline with a camcorder, a strong Light source and a monitor with the help of still images at exposure times between 100 and 1000 microseconds and secondly by looking at patterns stopping the train.
  • a charging electrode (substrate electrode) was mounted in the region between the pressure roller and the coating apparatus over the lay-up roller.
  • the substrate electrode (type: R130A from Eltex) was assigned a positive high voltage of +8.7 kV. So it had the opposite polarity as the layup electrode.
  • the supply was carried out by a high voltage generator (type KNH34 / P from Eltex).
  • the distance of the needle tips of the counter-charging electrode from the roll surface was about 12 mm. Due to the positive charges applied to the substrate, the high voltage at the laydown electrode could be lowered to 9.2 kV. The high voltage at the counter charge electrode could also be reduced.
  • the high voltage was adjusted so that the sum of the currents into the substrate electrode and into the counter charge electrode was equal to the absolute value of the current in the lay-on electrode. This was followed by a fine adjustment, so that only minimal charges were found on the coated substrate after leaving the lay-up roll.
  • a coating speed of 92 m / min was achieved with this arrangement without bubbles being observed between the mass and the substrate.
  • the tendency of the MOPP release film to wrinkle due to heating by the application of the hot mass due to the firm adhesion to the lay-up roll due to charging with the substrate electrode was significantly reduced.
  • small bubbles of the coating and the substrate became noticeable, arranged around circles of about 3-5 mm in diameter.
  • Example 1 It was assumed that the bubbles arranged in circles as described in Example 1 were caused by still remaining residual air between the laying roll and the substrate. This was to be assumed, since the electric field under the lay-up electrode is affected by residual air bubbles. In addition, it is to be expected that the air is ionized in these residual air bubbles, as well as an even greater influence on the electric field lines and increased damage to the release layer can occur.
  • the same structure as in Example 1 was chosen. However, the web path was changed so that the pressure roller was not wrapped. Instead, the substrate with the substrate electrode placed over the support line was pressed against the lay-up roller. The same voltage settings as in example 1 could be selected.
  • Example 2 With the same application rate of 50 g / m as in Example 1, this arrangement reached the maximum coating speed of 100 m / min at the experimental installation without any bubbles between mass and substrate being observed. The small bubbles between the coating and the substrate observed in Example 1, which were arranged around circles of about 3 to 5 mm, were no longer observed. To compare the damage of the release layers, samples were also produced at 85 m / min and compared with the procedure in Example 1 with a pressure roller and without a substrate electrode.
  • the damage was determined with the following measuring method.
  • release liner On the side of the release liner to be measured is a double-sided test adhesive tape applied bubble-free and pressed with a 2 kg steel roller by rolling over five times. This is followed by storage for one week in a heating chamber at 70.degree.
  • release force the side facing away from the release liner becomes of the test band fixed on a steel rail.
  • the on the test tape glued release liners at an angle of 180 ° at a speed deducted from 300 mm / min.
  • the required tensile force (in cN / cm) is at a Tensile testing machine under standardized conditions (23 ° C, 50% humidity) measured.

Landscapes

  • Adhesive Tapes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Claims (22)

  1. Procédé de fabrication de produits en forme de bande en au moins deux couches, dans lequel une pâte qui sort d'un dispositif d'application est appliquée sous la forme d'une couche sur un support en forme de bande en même temps que l'on y applique des charges électrostatiques, le support étant guidé par un dispositif de transport, et dans lequel le support revêtu de la pâte est neutralisé électrostatiquement avant de quitter le dispositif de transport, dans lequel, avant le revêtement, des charges électrostatiques sont appliquées sur le support en forme de bande au moyen d'une électrode de support de telle sorte que le support soit repoussé contre le dispositif de transport.
  2. Procédé selon la revendication 1, caractérisé en ce que le dispositif d'application est configuré comme filière et en particulier filière en fente large, filière à deux ou plusieurs canaux ou filière adaptative.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le dispositif de transport est configuré comme cylindre d'application qui est en particulier raccordé à la terre et/ou dont la température peut être contrôlée.
  4. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que la pâte est chargée électrostatiquement au moyen d'au moins une électrode d'application qui est disposée en particulier au-dessus du dispositif de transport, de préférence le cylindre d'application, dans la zone de la ligne d'application de la couche de pâte.
  5. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que comme électrode d'application, on utilise deux électrodes à aiguilles disposées directement l'une derrière l'autre dans le sens d'avancement de la bande et dont les aiguilles sont décalées en particulier latéralement d'un demi-intervalle entre aiguilles.
  6. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support revêtu de la pâte est neutralisé électrostatiquement au moyen d'au moins une électrode de contre-charge avant de quitter le dispositif de transport, de préférence le cylindre d'application, la contre-électrode étant située en particulier au-dessus du dispositif de transport, de préférence le cylindre d'application, dans la zone située entre la ligne d'application de la couche de pâte et la ligne d'enlèvement du support revêtu.
  7. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support revêtu de la pâte est maintenu électrostatiquement neutre au moyen d'au moins une électrode de décharge lorsqu'il quitte le dispositif de transport, de préférence le cylindre d'application, l'électrode de décharge étant située en particulier au-dessus du dispositif de transport, de préférence le cylindre d'application, dans la zone de la ligne d'enlèvement du support revêtu.
  8. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support est repoussé contre le dispositif de transport, de préférence le cylindre d'application, au moyen d'un cylindre de poussée et/ou est enlevé du dispositif de transport, de préférence le cylindre d'application, à l'aide d'un cylindre d'enlèvement.
  9. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'un écran en matériau électriquement isolant est installé entre le dispositif d'application et l'électrode d'application dans le sens d'avancement de la bande.
  10. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support est neutralisé électrostatiquement avant le revêtement.
  11. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que la tension électrique du dispositif de transport, de préférence le cylindre d'application, est de 1 à 40 kV et en particulier de 2 à 15 kV.
  12. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que la pâte est réticulée sur le support avant que ce dernier quitte le dispositif de transport, de préférence le cylindre d'application, en particulier au moyen de faisceaux d'électrons, d'un rayonnement UV, de lumière visible ou d'une combinaison de ceux-ci, et/ou thermiquement.
  13. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que l'électrode de support est formée d'une ou de plusieurs électrodes individuelles qui sont disposées les unes derrière les autres.
  14. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que l'électrode de support est disposée entre le dispositif d'application et un cylindre de poussée du support.
  15. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce qu'au lieu d'un cylindre de poussée, on dispose une électrode de support dans la zone située au-dessus de la ligne d'application du support sur le dispositif de transport.
  16. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que l'électrode de support est alimentée en une tension électrique de polarité opposée à celle de l'électrode d'application.
  17. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support est un matériau de support pour une bande adhésive et/ou la pâte est une pâte adhésive.
  18. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support est une feuille de libération pour un ruban adhésif.
  19. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support est un pré-produit constitué d'une feuille de libération, d'une pâte adhésive et d'un support pour un ruban adhésif double face, la pâte étant une pâte adhésive.
  20. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support est constitué d'une ou de plusieurs couches et/ou en ce que le revêtement est constitué d'une ou de plusieurs couches, au moins l'une des couches étant adhésive.
  21. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que le support est une feuille de libération et le revêtement constitué d'une première pâte adhésive, du support et d'une deuxième pâte adhésive, est extrait d'une filière à trois canaux ou adaptative.
  22. Procédé selon au moins l'une quelconque des revendications précédentes, caractérisé en ce que comme pâtes, on utilise des pâtes adhésives à base d'acrylate, de caoutchouc naturel, de caoutchouc synthétique ou d'EVA.
EP02024369A 2001-11-26 2002-11-02 Procédé de revêtement Expired - Lifetime EP1314487B1 (fr)

Applications Claiming Priority (2)

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DE10157881A DE10157881A1 (de) 2001-11-26 2001-11-26 Beschichtungsverfahren
DE10157881 2001-11-26

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EP1314487A2 EP1314487A2 (fr) 2003-05-28
EP1314487A3 EP1314487A3 (fr) 2004-06-16
EP1314487B1 true EP1314487B1 (fr) 2005-10-12

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EP (1) EP1314487B1 (fr)
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DE10151286A1 (de) * 2001-10-22 2003-04-30 Tesa Ag Beschichtungsverfahren
DE102004048881A1 (de) * 2004-10-06 2006-04-13 Tesa Ag Verfahren zur Vernetzung einer Klebemasse, die sich auf einem beidseitig mit antiadhäsiven Silikonschichten ausgerüsteten Träger befindet, mittels Elektronenstrahlen
US7707963B2 (en) * 2006-03-31 2010-05-04 3M Innovative Properties Company System for forming multi-layer films using corona treatments
US20070231495A1 (en) * 2006-03-31 2007-10-04 Ciliske Scott L Method of forming multi-layer films using corona treatments
DE102006023743A1 (de) * 2006-05-18 2007-11-22 Tesa Ag Halogenfreie Folie, durch Elektronenstrahlenbestrahlung quereinreißbar, sowie die Verwendung derselben in einem Klebeband
JP4458546B2 (ja) * 2006-12-07 2010-04-28 日東電工株式会社 両面接着性感圧接着シートの製造方法
DE102017219658A1 (de) * 2017-11-06 2019-05-09 Tesa Se Verfahren zur Herstellung eines Klebebandes
JP7357986B1 (ja) * 2023-05-15 2023-10-10 硬化クローム工業株式会社 高電圧を印加可能な内部電極を有するバッキングロールを用いた静電補助塗布方法

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DE10151286A1 (de) * 2001-10-22 2003-04-30 Tesa Ag Beschichtungsverfahren

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EP1314487A3 (fr) 2004-06-16
ES2250571T3 (es) 2006-04-16
DE50204513D1 (de) 2006-02-23
EP1314487A2 (fr) 2003-05-28
DE10157881A1 (de) 2003-06-05
US6896936B2 (en) 2005-05-24
US20030138572A1 (en) 2003-07-24

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