DE10227084A1 - Method for production of a large roll of label material to be unrolled and stamped out involves coating one side of a supporting film with varnish and adhesive and then coating the other side with separating varnish - Google Patents

Abstract

A method for producing a large roll of label material comprising a supporting film coated with a base layer of varnish and an adhesive, in which a separating varnish is applied to the uncoated side of the supporting film, i.e. on the side opposite to the adhesive. A method for producing a large roll of label material involves: (a) coating a supporting film with a base layer of varnish (A); (b) coating the open side of the varnish layer (A) with an adhesive (B); (c) coating a release varnish onto the other side of the supporting film; and (d) rolling up the resulting laminate to form a roll. An independent claim is also included for labels made by stamping out separate labels after unrolling a large roll made by the above method.

Description

The invention relates to a method for the production of a large roll Label material and method for producing labels from the big role, the label being a backing has from a paint, in particular paint layer, very particularly made of thermosetting lacquer for laser inscription, and on one Side of the carrier layer one Adhesive layer is present.

Labels with at least one single-layer carrier layer from a varnish, which is equipped on one side with an adhesive, are manufactured according to the procedure outlined below.

In a first step, a support carrier film is applied the varnish of the base layer streaked and, if necessary, hardened.

In a parallel Work process will spread an adhesive layer on a release paper.

Then the support sheet with the backing layer as well as laminating the release paper with the adhesive layer in such a way that the Adhesive layer on the carrier layer rests and is anchored on this. The resulting Laminate becomes a major role wound up to punch the individual labels as needed unwound and in a further process of a punching device supplied becomes.

A disadvantage of this known method is that for Production of the large roll a release paper is always required, which is also included on the large roll is wound up.

This additional location, in principle is not absolutely necessary, increases the volume very much and the weight of the large roll, so that at given moderation the role or predetermined weight of the same less yardage is present on a roll as possible.

In the DE G 81 30 861 discloses a multi-layer label consisting of a thin and a thick self-supporting, opaque pigmented lacquer layer. Both layers consist of an electron beam hardened, solvent-free lacquer, the layer thicknesses being different. The label is inscribed in that the upper, thinner lacquer layer is burned off with the aid of a laser, so that the lower, thicker lacquer layer is visible, the lower layer preferably having a contrasting color to the former.

The manufacture follows exactly the method as disclosed in the prior art.

In the EP 0 645 747 A A laser-inscribable multi-layer label material is shown, which is composed of a first layer, a second layer which differs optically from the first layer, the first layer being removable by means of laser radiation in accordance with a desired writing or printing image while making the surface of the second layer visible. A transparent plastic film forming a carrier layer is also arranged between the layers.

The DE 44 21 865 A1 shows a single-layer laser label made of a carrier layer made of plastic, which contains an additive that shows a color change under laser irradiation.

The carrier layer is on one side coated a self-adhesive, which if necessary with a Release paper or a release film is covered.

Also in the production of this label will - how mentioned - a release paper used.

With the DE 199 09 723 A1 A security film has become known which has a carrier layer in which an identification medium is contained. With the help of a non-contact labeling process, the diffusion properties of this identification medium can be selectively and locally changed. If the security film labeled in this way is glued to a workpiece, the identification medium diffuses towards the substrate surface and causes a detectable reaction there. This diffusion or reaction occurs only in those areas of the substrate surface in which the diffusion ability was triggered or was not hindered by the labeling process. The safety film thus enables the workpiece to be clearly labeled and identified.

The security film is by means of of a non-contact Procedure labeled. This means that a dirt-resistant, fast, flexibly variable labeling can be achieved. The caption the security film - and hence the change the diffusion properties of the identification medium - in particular with the help of electromagnetic radiation. Particularly advantageous a laser is used to label the security film, with the help of this, both a temperature and a light sensitive Inscription can take place (the term "light" in this case the whole of the laser accessible Area of the electromagnetic spectrum). Lasers have the extra Advantage, high-contrast labels with any choice of the pattern to allow quick changes allow the labeling pattern and can be used reliably in the factory environment to be.

This label is also after the known method manufactured.

In the DE 199 04 823 A1 it is disclosed to individualize the backing material of the label without making any other changes to the known standard. A method for producing a film is described here, in which a support carrier film is first embossed by means of an embossing tool, the embossing tool ho has lographic structures. A film is then produced on the embossed support carrier film, so that at least one hologram appears on the film.

The object of the invention is a Process for making a large roll of label stock as well a process for the production of labels from the large roll for Disposal to make the above-mentioned requirement of saving material and space in the big role satisfy.

This task is solved by a method as it is according to the main claim is described. The subclaims are particularly advantageous embodiments of the subject of the invention and a method for producing individual Labels.

• – auf eine Stützträgerfolie zumindest eine erste Trägerschicht aus einem Lack ausgestrichen wird,
• – auf die der Stützträgerfolie gegenüberliegenden Seite der Trägerschicht eine Klebemasse beschichtet wird,
• – auf die der Trägerschicht gegenüberliegenden Seite der Stützträgerfolie ein Trennlack aufgebracht wird,
• – das sich ergebende Laminat zu einer Rolle gewickelt wird.

Accordingly, the invention relates to a method for producing a large roll of label material, wherein

• At least one first carrier layer is coated from a lacquer onto a support carrier film,
• An adhesive is coated on the side of the carrier layer opposite the supporting carrier film,
• A release lacquer is applied to the side of the support carrier film opposite the carrier layer,
• - The resulting laminate is wound into a roll.

To manufacture what is also desired according to the invention After the large roll has been unrolled, labels become the pre-label material preferably for the desired Formats and sizes punched or cut out by laser beam.

In the process of making a such a label is placed on the support film, which is advantageously a plastic film, in particular polyester, which Paint layer applied and by the action of an electron beam with high energy (150 to 500 kV) under effectively oxygen-free Conditions hardened. To improve the adhesion between the preferred ones two layers of paint can be by particularly low dose or by some oxygen to set a slightly sticky surface.

If necessary, the first layer is second applied and also hardened by electron beam. Thereon if necessary, the coating with the adhesive and with the release varnish. Then the polyester film is peeled off, so that the free surface the first, upper layer appears. Depending on the shape the surface the polyester film is shiny, smooth, matt or embossed.

• a) Trägerschicht aus Kunststoff, die
• b) ein Additiv enthält, das unter Laser-Bestrahlung einen Farbumschlag zeigt, und die
• c) einseitig mit einer Klebemasse beschichtet ist, und die
• d) auf der der Klebemasse gegenüberliegenden Seite mit einem Trennlack versehen ist.

In an advantageous embodiment of the invention, the label material consists of a

• a) carrier layer made of plastic, the
• b) contains an additive which shows a color change under laser irradiation, and the
• c) is coated on one side with an adhesive, and the
• d) is provided with a release lacquer on the side opposite the adhesive.

The carrier layer preferably has a thickness of 10 to 200 μm, in particular from 50 to 100 μm, on.

The additive can be a pigment especially copper hydroxide phosphate or iriodin, and in addition to the additive titanium dioxide can be used.

Suitable additives are, in particular, color pigments and metal salts, especially copper hydroxide phosphate or also iriodin, a pearlescent pigment such as is commercially available from Merck. These additives are added to the base polymers (such as in DE G 81 30 861 described), in particular in the order of a few parts per thousand to a maximum of 10% by weight, preferably in amounts of 0.1 to 10% by weight, in particular 0.5 to 5% by weight, based on the total weight of the carrier layer ,

When using the standard laser, especially the world-wide Nd-YAG solid-state laser with a wavelength of 1.06 μm, finds one at the point of impact of the laser on the material surface Color change or a color change takes place and there are sharp, high-contrast labels and received markings.

The carrier layer consists of one another advantageous embodiment from a hardenable lacquer, preferably a radiation curable Paint. In an alternative embodiment is the backing layer from a polybutylene terephthalate.

Further radiation-curable lacquers used according to the invention consist of unsaturated polyester, epoxy and polyester acrylates, as are also used for UV printing inks, in particular those made from a base polymer according to DE G 81 30 816 , namely an aliphatic electron beam curable urethane acrylate oligomer.

In principle, four types of paint can be used, provided their stability sufficient, for example acid-curing alkyd melamine resins, addition-curing polyurethanes, radical-curing styrenic lacquers and the like. However, radiation-curing paints are particularly advantageous because they are very quick without lengthy evaporation of solvents or exposure to Cure heat. Such Lacquers have been described, for example, by A. Vrancken (color and Lack 83, 3 (1977) 171).

More preferably, a second, in particular self-supporting, covering is applied to the upper side of the carrier layer, that is to say the side opposite the side to which the adhesive layer is applied pigmented carrier or lacquer layer preferably applied solvent-free, which is then in particular electron beam hardened.

The second upper layer of varnish is formed from a hardened, crosslinked lacquer, preferably has a thickness of 1 to 20 μm, in particular 5 to 15 μm, on, the first lacquer layer (or carrier layer) preferably one Strength from 20 to 500 μm, in particular 30 to 100 microns.

Both layers of paint have one preferred embodiment against each other a maximum color contrast.

Because the resulting label preferably consists of an opaque top layer, that can be easily burned by a laser beam, one lower layer in particular in a contrasting color to the first, the lower layer is such that it is not from the laser beam is easily burned.

In a further advantageous embodiment is either on the first backing layer or on the second carrier layer a color printed with a fluorescent or phosphorescent additive, in such a way that the finished label is the layer of paint between the two layers.

With two and multi-layer labels can in the for the font authoritative - carrier layer a suitable additive can be incorporated. The outer backing layer itself therefore remains unchanged, Only when laser engraving does the layer of paint become partially in places the label is exposed. Are in the example white Lacquer layer of color pigments, color particles, colored fibers and the like these are visible in the engraved areas.

The coloring particles can they are fine color pigments or preferably also visible particles on the order of 0.1 to 5 mm. When using finely ground color pigments, a slight color change of the logos creates a characteristic color mosaic with the visible particles. When using daylight fluorescent colors, the "fingerprint" can be recognized without any help frequently is undesirable. Color pigments or particles are therefore preferably used, that do not absorb in the range of visible light and thus are usually invisible - first when illuminating the label with a lamp of suitable wavelength the color pigments stimulate and shine in a characteristic way.

In addition to being excited by IR radiation Color pigments come mainly UV-active systems for use. In principle, luminescent materials are also suitable, by electron beams, x-rays etc. animated as well as thermochromic pigments that change when the temperature changes color reversible - however is in these cases the implementation the identification on the glued label is cumbersome in practice and more complex than visualization using light of a suitable wavelength.

When choosing the color pigments care must be taken that they for the Manufacturing process of Labels (film production, adhesive coating) sufficiently stable and are not irreversible in the process conditions (if applicable change thermal drying, electron beam or UV curing, etc.). Advantageous for continuous use of the labels is that this mostly sensitive phosphors embedded in a polymer matrix and additionally through the top layer protected are. Further measures against mechanical abrasion and protection against direct oxygen and Water contact is not necessary.

For the application according to the invention can different color pigments and substances are used. At the long-afterglow (phosphorescent) are most widespread or fluorescent pigments that are only or predominantly caused by UV radiation be excited and emit in the visible region of the spectrum (see overview for example Ullmann's encyclopedia der technical chemistry, 4th edition, 1979, publishing house chemistry). Known are also IR-active luminescent pigments. Examples of systems with UV fluorescence are xanthenes, coumarins, naphthalimides etc., some of them under the generic term "organic phosphors" or "optical Brightener "in the Literature led become. The addition of a few percent of the phosphors in question is sufficient, with integration into a solid polymer matrix being particularly favorable in terms of luminosity and stability. For example, can be used Recipes with RADGLO® pigments from Radiant Color N.V./Holland or Lumilux ® CD-Pigments by Riedel-de-Haen. Inorganic phosphors are also suitable. As long afterglow substances, especially with light emission in the yellow area, metal sulfides and oxides, mostly in Connection with suitable activators, proven to be favorable. These are for example under the trade name Lumilux ® N or as in terms of stability, luminosity and afterglow duration improved luminous pigments under the trade name LumiNova ® from Company Nemoto / Japan available.

These dyes / pigments listed as examples are included in the formulation of the respective paint layer in quantities of 0.1 to 50% by weight, preferably 1 to 25% by weight, very particularly preferably 7% by weight, incorporated and coated. After the final adhesive coating the lacquer layer and, if necessary, covering with release paper or Separating film is the label material for customer-specific use in front.

If, for example, long-lasting afterglow pigments are incorporated into the lacquer layer, the label, after appropriate stimulation of the luminescent pigments, has a characteristic afterglow in the area of the laser marking and on the edges on.

Such labels, the phosphors in the lacquer layer, especially those only after UV or IR excitation in the visible wavelength range emissive, contain, enable also a tailor-made production (Punching, for example) from the large roll. Instead of separately Print or control markings to be applied can be used when processing the large roll the light emission of the lacquer layer can be used for this. In particular after cutting the labels using a laser beam made from uncut stamped roll material can be defined in a downstream control unit Place the label as the excitation and emission with suitable equipment Tax stamp for further processing steps or for the production of the next label be used.

Alternatives to using phosphors are the incorporation of substances in the paint layer that are magnetic or have it detected electrically, as well as thermochromic pigments, which changes with temperature reversibly color.

Furthermore, the paint layer can contain substances are added, which lead to electrical conductivity lead the shift. With suitable measuring devices, which are portable, easy to use and inexpensive to obtain, and Suitable electrodes can directly check the conductivity on the glued label the paint layer can be determined. The electrodes are on two different points A and B of the paint layer stopped and one Voltage applied. In the presence of a continuous electrical conductivity A current flow can be measured between A and B. The type and amount of additive used are characteristic May have value. Because even when using the label directly on metals the paint layer through the electrically insulating adhesive layer of the conductive Metal is separated, there is no fear of incorrect measurements.

A fake through subsequent manipulation is excluded by the fact that the conductivity measurement not just from edge to edge of the labels, but between any exposed points can be made by laser.

So that's a conductivity can be detected, the complete paint layer throughout three-dimensional conductive his. Such a laser-inscribable label can be manufacture by adding electrically conductive substances to the recipe of the paint layer be added. This can be additional to the previous pigments or at least partially in Replacement of the existing pigments is done to ensure the good processing properties to maintain the paint pastes. In principle, conductive additives electrically conductive suitable for metallic, organic, polymeric and inorganic substances, the use of metals is preferred. Especially for white or light layers of paint is for the selection to take into account the inherent color of the conductive additive. conductive Soot is also suitable, but only for black or dark layers of paint.

In order to ensure good conductivity, a minimum additive concentration should be ensured so that there are sufficient particles in the lacquer layer to touch and have contact with one another. If this limit concentration is undershot, a conductive path from A to B is no longer ensured in the three-dimensional structure of the base layer. Metallic particles are therefore preferably used, fibers with a high length to cross-sectional ratio being preferred, since three-dimensional conductivity can be ensured with lower concentrations than with spherical particles; in addition, the color change of the lacquer layer with the fibers is less. Copper, iron, aluminum and steel and their alloys are preferably used as metals for cost-benefit considerations, but expensive, highly conductive metals such as silver and gold are also suitable. The fiber dimensions are 0.1 to 50 mm in length and cross sections with 1 to 100 μm, preferably metal fibers with a diameter of 2 to 20 μm with a cross section to length ratio of about 1: 100 to 1: 1000. Fibers of this type are homogeneously incorporated into the known formulation at 0.5 to 25% by weight, preferably with 2 to 10% by weight, and in accordance with DE G 81 30 861 coated and cured.

Leave customer-specific "fingerprints" on the labels can be realized by printing different colors or patterns become. Especially regular lines and line patterns leave characteristic patterns on the label edges of luminous dots arise and are also particularly material and cost-saving.

In a further advantageous embodiment is in the backing contain an identification medium.

With the help of a non-contact Labeling process the diffusion properties of this identification medium selectively and locally changed become. If the carrier film labeled in this way is glued to a workpiece, the identification medium diffuses towards the substrate surface and causes a demonstrable reaction there. This diffusion takes place or reaction only in those areas of the substrate surface, in which the diffusion ability through the labeling process triggered or was not hindered. The carrier layer thus enables clear labeling and identification of the workpiece.

The carrier layer is labeled using a non-contact process. In this way, fast, flexibly variable labeling that is insensitive to dirt can also be achieved in the factory environment. The labeling of the backing layer - and thus the changes diffusion properties of the identification medium - can be done in particular with the help of electromagnetic radiation.

Particularly advantageous for labeling the backing layer is the use of a laser, with the help of which both a temperature as well as light-sensitive labeling (where the The term "light" in this case total accessible to the laser Area of the electromagnetic spectrum). Lasers have the additional advantage high-contrast labels with any choice of pattern to allow quick changes allow the labeling pattern and can be used reliably in the factory environment to be.

A is used as the identification medium Fabric chosen, which triggers a detectable reaction on the substrate. For this must Identification medium can be adapted to the material properties of the substrate. For example, the identification medium can be a dye that is matched to the substrate included, which diffuses locally into the substrate surface and this Inking. Alternatively, the identification medium can contain a substance the one with the substrate surface a chemical reaction occurs. Of particular interest here Reactions in which the substrate surface is removed locally or locally bloated is so that the Labeling of the substrate after removing the film optically or can also be detected tactilely. For marking metallic An identification medium is particularly recommended for substrates, the one caustic Contains substance.

To increase the theft protection it may be advisable to choose an identification medium whose Influence on the underlying substrate is not visible to the naked eye. This can be achieved with an identification medium that and reflection properties of the substrate, for example, only in UV or IR range, but not affected in the visible range.

The substrate contains no visible traces the marker. The affected areas still contain how in front of the mark, made easy by knowledgeable security guards can be detected with the help of, for example, a UV or IR viewing device. In particular, the identification medium can be selected that the Detectability, for example UV fluorescence, only in certain wavelength the examiner Light is done.

For the film must be used industrially a high level of robustness Influences of temperature and light exhibit. These requirements can best met if the security film has physical barriers, which in the unwritten state of the carrier layer diffuses the Inhibit identification medium.

While During the labeling process, these barriers are locally destroyed or weakened that in the so weakened Areas a selective diffusion of the identification medium take place can. A high temperature or light resistance of the lettering the one for destruction the temperatures or light intensities required are higher than those to whom the object to be marked in Condition of use - too under extreme environmental conditions.

Such a diffusion inhibition of the Identification medium that can be canceled by means of non-contact labeling can be advantageous by microencapsulation of the identification medium in the carrier layer will be realized. The identification medium is enclosed in capsules, whose walls consist for example of wax and / or fat and for example due to the local influence of heat in the affected areas the film can be broken open so that the identification medium contained therein escape and - upon contact with the substrate - in can diffuse into it or react with it.

A particularly high temperature resistance the lettering can be reach when the barrier is formed by a barrier layer that will be flat between carrier layer and an adhesive layer is arranged and the unlabelled State of the film the diffusion of the identification medium from the backing prevented out. By labeling the carrier layer the barrier layer is locally broken, so that the identification medium escape locally from the carrier layer at these breakthrough points and can diffuse into the adhesive layer.

The intact when labeled remaining areas of the barrier layer effectively prevent the Diffusion of the identification medium and thus a reaction in these unlabeled areas.

On the one hand, it is possible for the carrier layer represents a kind of matrix in which the identification medium is embedded is. Alternatively, the material of the carrier layer itself can represent the identification medium, So that the backing consists of identification medium.

In an embodiment of the Labels are, for example, the one described in DE G 81 30 861 Two-layer film material used. Before coating, the back the whole area, printed using scatter printing or in particular with defined geometries. Printing inks with a high proportion of luminous pigments are preferred applied by screen printing to layer thicknesses in the range of 0.5 to 50 μm, preferred 2 to 25 μm too achieve.

Also preferred is an embodiment of the label in which the carrier layer consists of at least one lacquer layer, obtainable by that the varnish layer is preferably applied solvent-free on a printed or embossed support carrier film and then cured. In addition, a hologram can be applied to the lacquer layer.

The printing of the support film takes place in particular according to the flexographic printing process, because the UV flexographic printing process owns regarding the design of geometries a very high degree of freedom and can be especially for weblike Materials from paper to film at the lowest possible price good print quality provide. With this technology it is possible to create lines, fields, pictures, logos, Fonts etc. in different sizes and types from the cliché to transfer the printing substrate.

• – Druckvorstufe (reprotechnisch Ausarbeitung des Druckklischees)
• – Druckplatte
• – Druckformataufbau
• – Bedruckstoff
• – Rasterwalze
• – Druckfarbe
• – Farbgebung
• – Druckspannungs

The most important factors influencing this process are:

• - prepress (reprotechnical preparation of the printing plate)
• - Printing plate
• - Print format structure
• - substrate
• - Anilox roller
• - printing ink
• - coloring
• - compressive stress

In the application described above of the laser-inscribable label are preferably logos and fonts with different levels of complexity generated. The UV flexographic printing process can be used well here.

For this purpose, a cliché with the logos and fonts is wetted with printing ink and transferred to a plastic film. The printing ink can then be cured by physical activation (thermal, radiation chemical) on the film. For this purpose, the paint should have a high bond strength to the film substrate; this is essential for further processing. A pressure anchor must be checked before further processing. The cross-cut test (DIN EN ISO 2409 ). The print should achieve at least a rating of Gt 02 in the cross hatch test.

To achieve a high bond strength / pressure anchoring is a corresponding selection or formulation of the Ink depending on of the film material and / or the use of a pretreatment process for the printing film necessary. The corona treatment can preferably be selected here, that can be used inline for printing. Using The surface tension of a PET film should be set to> 50 mN / m become. This can be done with usual Test inks can be measured.

Depending on the UV lamp, UV curing should be one have a percentage power setting between 50% and 100%, to have sufficient flexibility of the Print for to guarantee the further processing.

To be later on the laser label visible and sensible To achieve the impression result, the printing should have a height of 0.1 μm to 15 μm. A height is preferred from 1 to 5 μm to choose. The impression and expression of pressure can also be influenced by the course of the Pressure points can be varied.

To implement the invention, the other conventional printing processes that are used as High pressure processes are known. This includes book and screen printing.

The support film can be used with a wide variety of Motifs are printed, for example company logos or advertising. By printing the support film creates a negative impression on the visible surface of the first lacquer layer of the label according to the invention.

It is particularly preferred if in the impression of the printed support film in the first layer of lacquer as a depression from 0.1 to 15 μm, preferably from 1 to 5 μm is present.

The production of the label according to the invention can then be embossed Support carrier sheet take place, for example on a polyester film of preferably 25 up to 100 μm Strength, in particular 50 μm.

The embossing of the support carrier film can, for example with an embossed sheet (available at Gerhardt) in different strengths or depths become. The embossing depth depends on from the set embossing pressure, the on the embossing process Magnet cylinder used and the type of impression cylinder. Wrapping the impression cylinder (for example with tesaprint or with a polyester film) causes a strong embossing.

Furthermore, the one used embossing tool have holographic structures, so that on the paint layer maps the structure and yields at least one hologram.

The side of the embossing tool facing the material to be embossed is so shaped that one Structure arises, which is a diffraction grating or one Contains holographic illustration.

Because the hologram in the paint layer self-generated is a harmful one Multi-layer structure does not exist, and has the diffraction grating produced in this way the same durability and laserability like the lacquer layer itself.

In an advantageous embodiment there is the support carrier film Made of a thermosetting or thermoplastic material that is durable embossed is, in particular made of polyester or polyamide.

The pressure sensitive adhesive is, for example, a pressure sensitive adhesive such as that in the DE 15 69 898 C. is disclosed. The content of the entire disclosure of this document is therefore part of this invention.

For example, an acrylic adhesive applied with 25 to 35 g / m ² mass.

Through the adhesive layer designed according to the invention there is no impairment of the Label. The physical and chemical resistance are not changed.

This is experienced from the application perspective Label no loss in terms of Can be labeled with a laser, legibility of the information.

The release lacquer is for example Apo 7403 ® 1.5%.

• – Ethanol
• – Polyvinylstearylcarbamat
• – Benzin
• – Toluol

The release coating preferably consists of a mixture which contains the following components:

• - ethanol
• - polyvinyl stearyl carbamate
• - Petrol
• - toluene

• – Branntwein V.VG.99.6 (Ethanol) 18 bis 24, insbesondere 21
• – REL PVS Carbamat (Polyvinylstearylcarbamat) 0,5 bis 1,5, insbesondere 1
• – Benzin 60.95 frisch 100 bis 120, insbesondere 108
• – Toluol 60 bis 80, insbesondere 70

The composition of the release lacquer can vary. Based on the above mixture, the following orders of magnitude and sample substances are preferred:
parts by weight

• - Brandy V.VG.99.6 (ethanol) 18 to 24, especially 21
• - REL PVS carbamate (polyvinyl stearyl carbamate) 0.5 to 1.5, especially 1
• - Gasoline 60.95 fresh 100 to 120, especially 108
• Toluene 60 to 80, especially 70

The release lacquer is preferably applied with 2 to 10 g / m ² , preferably 3 to 7 g / m ² , particularly preferably with 5 g / m ² .

The advantages of the method according to the invention for the production of a large roll can be seen in the fact that Release paper as well as the step of covering the release paper be saved so that a large roll according to the invention, even if with an additional Layer of release lacquer is opposite a conventional one Roll with the same volume has a longer barrel length.

Furthermore, the release varnish takes over a mechanical one Protective function of the first layer of label material on the large roll, the otherwise external influences like Scratches or the like would be delivered unprotected.

This will result in the loss of label material between roll-up and roll-off of the large roll minimized.

• 1 ein Etikett, wie es sich ergibt bei einem Herstellungsverfahren nach dem Stand der Technik, und
• 2 ein Etikett, wie es sich ergibt bei einem erfindungsgemäßen Herstellungsverfahren.

A particularly advantageous embodiment of the invention is explained in more detail with reference to the figures described below, without wishing to restrict it unnecessarily. Show it

• 1 a label as it results from a manufacturing process according to the prior art, and
• 2 a label as it results from a manufacturing method according to the invention.

In the 1 the structure of a label is shown as it results from a manufacturing method according to the prior art.

The label is produced by a major role is unrolled from which the individual labels are punched. The labels have the following form.

• - On a support sheet 2 is a first carrier layer 1 streaked from a varnish and cured.
• - On the support film 2 opposite side of the carrier layer 1 one is adhesive 3 coated.
• - The adhesive 3 is with a release paper 4 covered.

In the 2 the structure of a label is shown as it results in a manufacturing method according to the invention.

The label is produced by a major role is unrolled from which the individual labels are punched. The labels have the following form.

• - On a support sheet 2 is a first carrier layer 1 streaked from a varnish and cured.
• - On the support film 2 opposite side of the carrier layer 1 one is adhesive 3 coated.
• - On the backing layer 1 opposite side of the support carrier film 2 a release varnish 5 is applied

example

In the following example, a special advantageous label are disclosed using a printed support film is made so that on the label surface indentations result.

The support film to be printed, here a polyester film (Hostaphan RN 75®) from Mitsubishi before printing accordingly by a corona treatment the desired surface tension treated. A corona station VETAPHON-Corona-Plus DK - E-Trester can also be used ET 2 - with a power of 0.2 to 2.0 kW can be used. Advantageous for the Further processing is the adjustment of the surface tension to> 50 mN / m.

A cationically curable is used UV varnish SICPA 360076 from SICPA, Aarberg, which is tinted blue. By adding 5% by weight of cylinder repelling agent, the printing ink becomes for the Processing optimized.

The pretreated is treated with an ARSOMA em 410 or em 510 UV flexographic printing machine Polyester film printed at a machine speed of 30 m / min via a flexographic printing station. The precisely defined ink transfer to the flexographic printing plate is achieved using an appropriate anilox roller using the negative doctor blade process. The color is then transferred from the cliché to the film substrate in a color height of 3 to 4 μm.

The application of paint on the film substrate is cured by powerful UV lamp tubes. For this purpose, a UV station Micro UV station GEW with a radiation power of 110 W / cm and one wavelength of 365 nm. The support sheet is for now prepared for further processing.

Then a commercial one Long chain polyester diol, aliphatic polyurethane acrylate Diisocyanate and terminal Acrylic groups (molecular weight approx. 1500, functionality 2) with 20% Hexanediol bisacrylate mixed. A highly viscous liquid is obtained of about 10 Pa⋅s.

• – Eine Schwarzpaste A durch Anreiben mit 12% Ruß FCF (mittlerer Teilchendurchmesser 23 μm) am Dreiwalzenstuhl und
• – eine Weißpaste B durch Anreiben mit 45 % eines Al und Si stabilisierten Rutilpigments (TiO₂-Gehalt 90%, Dichte 3,9 g/m²).

From this is made:

• - A black paste A by rubbing with 12% carbon black FCF (average particle diameter 23 μm) on the three-roll mill and
• - a white paste B by rubbing with 45% of an Al and Si stabilized rutile pigment (TiO ₂ content 90%, density 3.9 g / m ² ).

Paste A comes in a thickness of 10 μm in one 50 μm thick biaxially stretched and embossed Painted polyester film and through an electron beam of 350 keV hardened with a dose of 1 Mrad under inert gas.

A white paste B with a strength of 50 μm applied and again with the electron beam under inert gas hardened in a dose of 3 Mrad.

A pressure sensitive adhesive corresponding to the DE 15 69 898 A1 painted so that the layer has a thickness of 20 microns after drying.

The release coating is applied to the white paste B. Apo 7403 ® applied and dried.

The resulting laminate becomes a major role wound up without a Release paper is provided.

For the production of the labels themselves the roll is unwound again and the individual labels are removed this into the desired one Die-cut formats and sizes or cut out with a laser beam.

Claims (6)

Process for producing a large roll of label material, wherein on a support sheet at least a first carrier layer is painted out of a varnish, on the support film opposite Side of the support layer an adhesive is coated, on that of the carrier layer opposite Side of the support sheet a release varnish is applied, the resulting laminate is wound into a roll. A method according to claim 1, characterized in that the carrier layer from a hardened Lacquer, preferably a radiation-hardened lacquer, particularly preferably from an electron beam hardened Polyurethane acrylate paint exists. Process according to the claims 1 or 2, characterized in that on the carrier layer, in particular Lacquer layer, a second carrier layer, likewise in particular lacquer layer is applied, which can then be cured. Method according to at least one of claims 1 to 3, characterized in that that the second coat of paint a strength from 1 to 20 μm, in particular 5 to 15 μm, and the lacquer layer has a thickness of 20 to 500 microns, in particular 30 to 100 μm. Method according to at least one of claims 1 to 4, characterized in that that both layers of paint have maximum color contrast against each other. Label obtained by the large roll of label material after rolled out at least one of the preceding claims to individual Labels are punched.