EP1818893B1 - Adhesive label, method of manufacture and its utilisation - Google Patents

Abstract

The adhesive label for packing tubes, saucepans, tins or bottles made of glass, plastic or metal, comprises a first transparent printing material layer coated on one side with an adhesive compound (2), and a second printing material layer coated on the lower side of the adhesive compound. If necessary the first and second material layer is covered by a protective release paper/film (3). A printing ink (12) in counter print is applied to the underside of the first printing substrate layer and a further printing ink in frontal print is applied on the topside of the first substrate layer. The adhesive label for packing tubes, saucepans, tins or bottles made of glass, plastic or metal, comprises a first transparent printing material layer coated on one side with an adhesive compound (2), and a second printing material layer coated on the lower side of the adhesive compound. If necessary the first and second material layer is covered by a protective release paper/film (3). A printing ink (12) in counter print is applied to the underside of the first printing substrate layer and a further printing ink in frontal print is applied on the topside of the first material layer. The underside is aligned to the adhesive compound and the topside lies opposite to the adhesive applied surface. The adhesive mass is hot melt acrylate-base that shows a dielectric constant (K-value) of 20. The printing ink on the lower surface of the first printing layer is silver color and the further printing ink on the upper surface is a transparent relief varnish. An independent claim is included for a process for manufacturing labels.

Description

The invention relates to self-adhesive finished labels, processes for the preparation of these and their use.

Labels usually consist of several layers, for example a printing material on which a self-adhesive coating is applied, as well as a carrier material.

The carrier material is usually provided with a release layer of silicone. It has the task to carry the actual label during manufacture and protect its adhesive layer from contamination, so that it can undergo processing processes such as printing, punching, cutting, perforating, etc. When punching the self-adhesive labels, the siliconized material serves as a punching pad. As support materials are release papers or different release films to choose from.

A common carrier material for self-adhesive labels are calendered kraft papers. In addition, coated papers are also used. For special requirements, such as insensitivity to moisture, plastic-coated paper is also used. Furthermore, special products such as self-copying carrier papers are available.

Plastic films are chosen primarily as a carrier material, if the later application makes special demands. If a self-adhesive label, for example, imitate the appearance of a direct-printed container (no-label look), adhesive composite manufacturers often recommend siliconized films that are highly transparent and extremely smooth.

As a basis for silicone paper can serve pulp that is bleached either conventional or chlorine-free. Release papers are available in different colors. They are used in different basis weights and strengths. The palette ranges from very thin papers to cardboard thickness materials.

When selecting the carrier material, the factor separation behavior is taken into account. Important features for release liners are also tear resistance, punching resistance, tensile strength, dimensional stability, etc. They must be tailored to the requirements imposed by processing processes and the manual or automatic dispensing of the labels.

The separation behavior can be influenced by the type of silicone coating and is thus adjustable to different purposes. This plays an important role especially in the further processing of self-adhesive labels with automatic dispensers. A trouble-free and quick donating makes the self-adhesive label economically superior.

A special form among the self-adhesive labels are the so-called carrierless systems. They do not require any siliconized release papers or foils. In this label form is considered a particular advantage that no carrier material is obtained as waste after application. Due to the lack of a carrier, however, the selection in the labels is limited to rectangular shapes, since the punching without a carrier is not possible. The cutting of the self-adhesive label takes place only in the labeling.

Self-adhesive labels are used in a wide range of applications and meet an extraordinarily wide range of different requirements. This is made possible by a selection of materials used in the label industry diverse is like in hardly any other industry. For processing therefore also means of production are necessary, which are similarly versatile in their possibilities. This explains why all processes available in practice are used for label production. A key role in this context is the printing of self-adhesive labels. The following overview of the various printing technologies with a description of the respective basic principle makes it easier to understand which possibilities are available in conventional printing processes such as letterpress, flexographic, offset, screen or gravure printing as well as in non-impact printing techniques or digital processes.

Under high pressure, the processes letterpress and flexo printing are subsumed.

Book printing can be seen as the classic method of duplication in print. It was already used in the Middle Ages - as the name implies - mainly for the production of books.

All conventional printing processes require a printing form, also called a printing substrate, which consists of printing and non-printing parts. In letterpress printing, the printing plate is often referred to as a cliché. Today, photopolymer printing plates have almost completely replaced the etched or electroformed clichés of the past. Because the raised areas of the cliché represent the printing surfaces, the letterpress printing is one of the high-pressure methods. The coloring of the printed parts is done via an inking unit, which consists of a series of rollers. They create a thin film of color and thus color the raised areas of the cliché. From the printing form there is a direct transfer of color under a certain contact pressure on the substrate.

Another high-pressure process is flexographic printing. A difference to the book printing consists in the printing form, which is much more elastic. As a result, a smaller contact pressure is required to transfer the motif directly from the printing plate to the substrate. This is an important reason for the wide range of materials that can be printed using the flexographic printing process.

Furthermore, the processes differ by the colors, which have a rather viscous consistency in letterpress printing, while flexographic inks are much thinner. The inking units have a correspondingly simple structure. The coloring of the Flexoklischees is done via anilox rollers. They have recesses in the roll surface, which transport a defined amount of color. They are filled either by a dipping roller, which rotates in a paint tray, or by a paint chamber, which is employed by the anilox roller.

A special feature of the flexographic printing process is the printing with radiation-curing inks. While solvent-based or water-based inks dry physically, in UV flexographic printing, polymerization of the inks or lacquers is achieved through exposure to UV rays. The curing reaction takes place in fractions of a second. This reduces process-typical phenomena of flexographic printing, which arise from the elastic printing form, such as pinch edges or high dot gain.

At the same time, it also facilitates the printing of difficult materials such as plastics, metallized films, etc.

Flat lithography subsumes the processes offset printing (wet offset) and waterless offset printing.

Offset printing is one of the planographic printing processes. Printing and non-printing surfaces are almost on one level. The offset is an indirect printing process. From the printing form, the ink is first deposited on a blanket and from there onto the substrate. Therefore, the name of this method (offset = English "offset") comes from. The separation of the printing and non-printing surfaces is based on the principle that fat and water repel each other. The printing areas of a metallic offset printing plate are prepared so that they are hydrophobic (water repellent) and thus accept the greasy printing ink. The remaining areas remain hydrophilic (water-friendly). For printing, the offset plate is supplied with both water and color. For coloring an inking unit, which is very similar to a letterpress press. The wetting of the plate surface with water is done with the help of a dampening unit.

Beim wasserlosen Offsetdruck wird auf die Feuchtung der Platten verzichtet. Um eine Einfärbung der nichtdruckenden Teile auf der Offsetplatte zu verhindern, sind diese mit einer farbabweisenden Silikonschicht überzogen, die bei der Entwicklung der Platten an den Stellen entfernt wird, die später Farbe führen sollen. Das führt dazu, dass die druckenden Teile im wasserlosen Offsetdruck leicht tiefer liegen. In der Praxis lässt sich damit eine sehr hohe Farbdichte erzielen und gleichzeitig ein sehr spitzer und randscharfer Punkt drucken.A proper adjustment of the color-water balance gives a sharp separation of the printing and non-printing surfaces. This allows a pinpoint print image and is especially important for raster gradients or very fine elements.

In the waterless offset printing is dispensed with the dampening of the plates. In order to prevent coloring of the non-printing parts on the offset plate, they are coated with a color-repellent silicone layer, which is removed in the development of the plates in the places that will later color. As a result, the printing parts are slightly lower in waterless offset printing. In practice, it is thus possible to achieve a very high color density and, at the same time, to print a very sharp and sharp-edged dot.

One method rarely used to print self-adhesive labels is gravure printing. It has evolved from ancient duplication techniques such as etching or copperplate engraving. Similar to these artistic processes, gravure prints are also etched or engraved in a printing form cylinder.

To color the cylinder this runs in a paint tray, from which the very low-viscosity gravure ink is scooped. Excess paint is wiped off with a ground steel strip called a squeegee. Gravure printing is known for high-quality image reproduction and consistent print quality. Typical fields of application are the areas of catalog and magazine printing as well as the production of packaging. In label production, this process is particularly suitable for long runs.

Screen printing subsumes the processes of flat screen printing and rotary screen printing.

Screen printing owes its name to the principle of the process, which is to press paint through a fine mesh screen onto the material to be printed. As a printing form is a mesh fabric made of metal, textile or plastic threads. To create a print image, the fabric stitches are sealed with a copyable coating. After appropriate exposure, this layer is washed out at the unexposed areas. During printing, the ink is pressed onto the substrate with the aid of a squeegee through these open stitches. A major advantage of screen printing is the high layer thickness in which the paint can be applied. This opens up the use of a wide range of special colors or special lacquers in screen printing.

In label printing, screen printing is used in two different process variants. The differences arise from the structure of the printing form. In flat screen printing, it is formed by a frame that is covered with a fabric. The label web is fed under the flat screen for printing, stopped and printed. Subsequently, the web is transported on to a printed image, so that the next printing process can take place.

For rotary screen printing, a stainless steel mesh is used, which is formed into a hollow cylinder. In the interior of this cylinder, the ink supply and the squeegee are arranged. Due to the rotative structure, a continuous printing process is possible with this method.

Technical labels are used in many areas for high-quality applications, such as nameplates for vehicles, machinery, electrical and electronic equipment, as process control labels and as warranty and inspection labels. In many cases, these applications inherently include the requirement for a more or less pronounced degree of counterfeit security. This counterfeiting security applies ostensibly for the period of attachment and the entire useful life on the part to be marked. Removal or manipulation should only be possible with destruction or visible, irreversible change. In particularly sensitive fields of application, a security level must also apply to the production of the labels. Too easy procurement and labeling of such labels as well as the production of plagiarism would allow unauthorized persons the unauthorized distribution of articles.

For the rational and variable production of high-quality labels, laser marking of suitable base material is becoming increasingly popular, especially in technical-industrial applications. With DE G 81 30 861 describes a multi-layer label in which a different colored cover layer is removed by the laser beam and thus allows the color contrast to the next layer labels of high quality and readability. This lettering is a type of engraving, which eliminates the manipulation possibilities as with traditional printing with inks and inks. at DE G 81 30 861 the label film is set by the raw materials used and the manufacturing process so brittle that a removal of the glued labels from the adhesive substrates is only possible with destruction.

An additional level of security is detected in the monolayer laser tag DE G 94 21 868 described: in addition to the advantageous properties of DE G 81 30 861 Here, the label is not effected by engraving in the top layer, but by a color change in the plastic layer itself, which later prevented manipulation of the labels as far as possible.

As a potential gap in the security chain, it therefore only appears that such single and multi-layer labels are freely accessible for laser inscription. For correspondingly high-quality goods, the procurement of the labels and labeling could even be considered as possible and worthwhile, even with costly laser aggregates.

To remedy this situation, the continuing development attempts to design the label pre-material for later labeling in such a way that it can always be identified as authentic original material with little effort and non-destructively. For the already mentioned laser labels, a subsequent identification is in principle also possible, but with unacceptable analytical effort and non-destructive.

Known for particularly security-related items such as banknotes, checks, check and personal identification cards, etc. are various methods to ensure counterfeit security. In addition to watermarks, printing with filigree patterns, application of holograms, occasionally "invisible" markings are also used.

In JP 08/328474 A1 describes a textile clothing label, which is printed on the upper side with a transparent, fluorescent color, woven design and print should be approximately congruent. A similar superficial printing with UV-active, photochromatic colors is in WO 88/01288 A1 described; however, to protect the chemicals of this paint layer, an additional protective layer against oxygen and water is necessary.

In FR 2,734,655 A1 In the case of checks, security marking is achieved by partially printing under an IR-transmissive layer which is invisible in the visible wavelength range, but is machine-readable / -identifiable with special IR light.

In EP 0 727 316 A1 a covert counterfeit security is achieved by the fact that in an extra layer especially on paper two reactive components are present, which give a color reaction under pressure - this is irreversible.

The use of electrically conductive or magnetic colors for printing on the surface are in JP 08/054825 A1 and CN 1,088,239 A1 described. Such systems are for label applications on complex metal parts such as vehicle and machine parts only severely operational.

In the JP 07/164760 A1 with fluorescent particles that are IR-excitable, are heat-transferred by thermal transfer printers. Although the prints contain a hidden originality identifier, the imprint is superficially applied both with solvents, heat and mechanically removable or changeable.

In DE 42 31 800 A1 labels are described that leave indelible marks on the substrates for the purposes of counterfeit security by means of sublimation colors or corrosive substances - however, the traces can only be identified after removal of the label, which is often undesirable or impossible.

In EP 0 453 131 A1 For highly secure papers such as passports, stocks, banknotes, etc. is described that fluorescent, especially UV-fluorescent indicators are incorporated in an intermediate layer between two permanently bonded layers of paper with the laminating adhesive, which are detectable only when light of suitable wavelength through the laminate , but not by reflection in reflected light. This system is unsuitable for applications where transmission of light through the bonded label is not possible and for completely opaque laser labels.

All of these methods are applied superficially or are superficially effective and thus not or only very limited usable for the known laser labels, since here would change and deteriorated for example, nameplate applications optically high-quality and extremely resistant surface. Particularly disturbing such a modification would be noticed in the to be regarded as a technical standard for nameplates two-layer labels with high-gloss black top layer and white base layer. In addition, the subsequently superficially applied tamper-evident fuses known from the prior art have the potential to carry out manipulations mechanically or using heat, chemicals, etc.

Above, the usual printing processes in label printing have already been explained in detail.

Normally, labels are produced in such a way that they are printed directly on the substrate (paper or film, for example 60 μm PP or 100 μm PE) (frontal printing).

You can also overlap such labels with a laminating film (for example, 12 microns PP) to protect the print. This exemplifies the DE 197 47 000 A1 , There, in particular, a way is found, which allows variable and inexpensive to install a custom security mark at the level of the label pre-material. Especially when using the standard label film after DE G 81 30 861 or DE G 94 21 868 On the back of the film before printing with adhesive is printed.

In particular, special printing inks with phosphors, daylight colors or, in particular, color pigments which can be excited by IR or UV radiation are used. After printing, the resulting material is coated as standard with self-adhesive, dried and covered with release paper.

Also known are counter printed labels in which a raw film (for example, a 60 micron PP film) is printed mirror-inverted and then in subsequent operations, the coating is done with adhesive, the carrier is laminated and the labels are punched. The printing is on these labels on the side facing the adhesive. For reasons that are easy to understand, this process is very complicated and therefore associated with high production costs.

Then also labels are represented on the market with a so-called intermediate pressure. For example, a 30 μm laminating film is printed in mirror image, laminated together in a suitable laminating station with a correspondingly thin (for example 30 μm PP) self-adhesive material, and then the composite is punched. This type of label is usually made in a single operation. With this method one can achieve an excellent silver print (usually gravure). However, in these labels, the entire printing on the inner side of the laminating film (liner pressure). The print is not plastic, it shows no relief effect, which is desired for certain applications. It is thus only the laminating foil printed on the inside page, without any additional printing on the top of the label.

From the EP 0 404 402 A2 is a label of a carrier layer, which is coated on one side with a self-adhesive, known, wherein on the support layer on the one hand, on the side which is oriented to the adhesive, a printing ink is printed so that between the carrier layer and adhesive, a printing ink is present, and on the other hand, on the side opposite the adhesive-finished surface, another printing ink is printed, so that there is another printing ink on the upper side of the carrier layer.

The DE 26 13 131 A discloses a license plate or label in the form of a badge consisting of a film adherable to a base, provided with a color coding representing a seal, the foil being made of transparent material and provided with the color coding on its adhesive side such that a part of the applied color coding is in intimate connection with the film, while the remaining color coding part is intimately connected to an adhesive layer applied to the film.

The US 4,557,505 A describes an adhesive tape with a carrier that is printed on both sides. One side of the printed carrier is covered with two layers of paint. Finally, an adhesive is applied to the outer of the two layers.

It is not provided in the adhesive tape that one of the printing inks is present directly between the printing substrate layer and the adhesive.

The object of the present invention is firstly to provide a self-adhesive label in which the printing material or a printing material layer has printing on both sides, ie in particular counter printed elements (in intermediate printing or reverse printing) are combined with elements which are produced by frontal printing.

On the other hand, the object of the invention to provide methods for producing such self-adhesive labels.

This problem is solved by labels, as set out in the main claim. The subject of the dependent claims are advantageous developments of the subject invention. Furthermore, the invention relates to proposed uses of the label according to the invention as well as excellently designed methods for producing the label.

• a uf der Seite, die zur Klebemasse ausgerichtet ist, eine Druckfarbe im Konterdruck aufgedruckt ist, so dass zwischen Bedruckstoffschicht und Klebemasse eine Druckfarbe vorhanden ist, und
• a uf der Seite, die der klebend ausgerüsteten Oberfläche gegenüber liegt, eine weitere Druckfarbe im Frontaldruck aufgedruckt ist, so dass auf der Oberseite der Bedruckstoffschicht eine weitere Druckfarbe vorhanden ist.

Accordingly, the invention relates to a label of at least a first transparent substrate layer, which is coated on one side with a self-adhesive, which is optionally covered with a release paper or a release film, wherein on the first substrate layer

• On the side, which is aligned to the adhesive, a printing ink is printed in counter-pressure, so that between the printing material layer and adhesive, a printing ink is present, and
• On the side facing the adhesive surface, another ink is printed in the front print, so that on the top of the substrate layer another ink is present.

The self-adhesive composition is one based on acrylate hotmelt, which has a K value of at least 20.

In a preferred embodiment of the invention (interlayer printing), a second printing material layer is present below the adhesive, on the underside of which a self-adhesive composition is coated, which is optionally covered with a release paper or a release film. Then the second substrate layer is the actual The substrate of the basic label and the first substrate layer the laminating film. Furthermore, the upper adhesive coating represents the laminating adhesive of the label. It is preferred if, following the printing on the underside of the printing material or the first printing material layer (counter printed elements), the lamination takes place.

It is further preferred if the printing ink is printed on the upper side of the printing substrate or the first printing material layer in frontal printing after the lamination has taken place.

It is further preferred if the printing inks for counter printed elements are metallic (silver, gold, etc.).

In an excellently designed embodiment of the label according to the invention, in addition to the printing of metallic inks in the form of counter printed elements, at the same places on the upper side a raised pressure (frontal pressure), in particular a pressure with a transparent relief lacquer (for example from Sicpa, 78- 3-021) or with a conventional transparent screen printing ink.

In this way, the relief character of a hot foil stamping can be simulated, creating an effect that is very similar to a hot foil stamping.

According to the invention can be used as materials of the printing material or the first substrate layer films, in particular monoaxially and biaxially oriented films based on polyolefins, then films based on stretched polyethylene or stretched copolymers containing ethylene and / or polypropylene units, optionally also PVC Films, PET films, films based on vinyl polymers, polyamides, polyesters, polyacetals, polycarbonates

Also films based on stretched polyethylene or stretched copolymers containing ethylene and / or polypropylene units can be used as printing material according to the invention.

Monoaxially stretched polypropylene is characterized by its very high tensile strength and low elongation in the longitudinal direction. Preferred for the preparation of Labels according to the invention are monoaxially stretched films based on polypropylene. The thicknesses of the monoaxially stretched films based on polypropylene are preferably between 20 and 100 μm, in particular between 25 and 65 μm, very particularly between 30 and 60 μm.

Monoaxially oriented films are predominantly single-layered, but in principle it is also possible to produce multilayer monoaxially stretched films. Are known predominantly one, two and three-layer films, the number of layers can also be chosen larger.

The thicknesses of the biaxially oriented films based on polypropylene are in particular between 12 and 100 μm, in particular between 20 and 75 μm, very particularly between 30 and 60 μm.

Biaxially oriented films based on polypropylene can be produced by blown film extrusion or by means of conventional flat film systems. Biaxially stretched films are produced in one or more layers. In the case of multilayer films, the thickness and composition of the different layers may be the same, but also different thicknesses and compositions are known.

Particularly preferred for the labels of the invention are monolayer, biaxially or monoaxially stretched films and multilayer, biaxial or monoaxial polypropylene-based films which have a sufficiently strong bond between the layers, since delamination of the layers during use is disadvantageous.

Films based on rigid PVC are used for the production of labels as well as films based on soft PVC.

For the labels according to the invention preferably films are used based on rigid PVC. The thicknesses of the films are preferably between 20 and 100 μm, in particular between 25 and 65 μm, very particularly between 30 and 60 μm.

Polyester-based films, for example polyethylene terephthalate, are also known and can also be used to make the labels of the invention. The thicknesses of the films based on PET are between 20 and 100 μm, in particular between 25 and 65 μm, very particularly between 30 and 60 μm.

• die Hydroxycarbonsäure-Typen (AB-Polyester) und
• die Dihydroxy-Dicarbonsäure-Typen (AA-BB-Polyester).

Polyesters are polymers whose basic building blocks are held together by ester bonds (-CO-O-). According to their chemical structure, the so-called homopolyesters can be divided into two groups,

• the hydroxycarboxylic acid types (AB-polyester) and
• the dihydroxy-dicarboxylic acid types (AA-BB polyester).

The former are prepared from only a single monomer by, for example, polycondensation of an ω-hydroxycarboxylic acid 1 or by ring-opening polymerization of cyclic esters (lactones) 2, for example

On the other hand, the latter is synthesized by polycondensation of two complementary monomers, for example a diol 3 and a dicarboxylic acid 4:

Branched and crosslinked polyesters are obtained in the polycondensation of trihydric or polyhydric alcohols with polyfunctional carboxylic acids. The polyesters are generally also the polycarbonates (carbonic acid polyester) counted.

Examples of AB-type polyesters (I) include polyglycolic acids (polyglycolides, R = CH2), polylactic acids (polylactides, R = CH-CH3), polyhydroxybutyric acid [poly (3-hydroxybutyric acid), R = CH (CH3) -CH2], Poly (ε-caprolactone) e [R = (CH 2) 5] and polyhydroxybenzoic acids (R = C6H4).

Pure aliphatic AA-BB type polyesters (II) are polycondensates of aliphatic diols and dicarboxylic acids which are used, inter alia, as products having terminal hydroxyl groups (as polydiols) for the preparation of polyester polyurethanes [for example polytetramethylene adipate; R1 = R2 = (CH2) 4].

In terms of quantity, the largest technical significance of AA-BB type polyesters comprises aliphatic diols and aromatic dicarboxylic acids, in particular the polyalkylene terephthalates [R2 = C6H4, with polyethylene terephthalate (PET) R1 = (CH2) 2, polybutylene terephthalate (PBT) R1 = (CH2) 4 and Poly (1,4-cyclohexanedimethylene terephthalate) s (PCDT) R1 = CH2-C6H10-CH2] as the major representative. These types of polyesters can be widely varied in their properties by using other aromatic dicarboxylic acids (for example isophthalic acid) or by using diol mixtures in polycondensation and can be adapted to different fields of application.

Purely aromatic polyesters are the polyarylates, which include the poly (4-hydroxybenzoic acid) (formula I, R = C6H4), polycondensates of bisphenol A and phthalic acids (formula II, R1 = C6H4-C (CH3) 2-C6H4, R2 = C6H4) or also from bisphenols and phosgene.

As materials for the second substrate layer in the described embodiment (interlayer printing), any self-adhesive materials commonly used for producing self-adhesive labels can be used without exception. This is known to be a printing material, which is coated with a self-adhesive composition, covered with a carrier, usually a release paper or a release film.

It should be noted at this point on the range of self-adhesive materials, which is offered for example by Avery (Fasson).

In particular, self-adhesive materials with a thin printing material are used for this embodiment, so that the total thickness of the label laminated with the first printing material layer corresponds to the conventional labels.

Preference is given to self-adhesive materials with a printing material based on PP having a thickness of 25 to 60 microns, more preferably those having a thickness of 30 to 40 microns. Also usable without restriction are any types of self-adhesive compositions which are offered for self-adhesive materials. Depending on the intended use, permanent, removable, frozen adhesives, self-adhesive compounds for no-label-look labels etc. are used.

Commercially available inks of the respective suppliers of label printing inks are used as printing inks for the printing methods described. For example, UV-curing offset / flexo / book / screen printing inks or solvent-based gravure printing inks are offered for polyolefin film label materials, for example Flexocure® series for UV flexo printing from Akzo.

In order to take counterfeit-proof aspects into account in the labels used, different color pigments and substances can be used in the printing inks.

Most widely used are photoluminescent (phosphorizing) or fluorescent pigments, which are excited only or predominantly by UV radiation and emit in the visible region of the spectrum (for an overview see, for example Ullmann's Encyclopedia of Industrial Chemistry, 4th edition, 1979, Verlag Chemie ).

However, IR-active luminescent pigments are also known. Examples of UV fluorescence systems are xanthenes, coumarins, naphthalimides, etc., which are sometimes referred to in the literature under the generic term 'organic phosphors' or 'optical brighteners'. The addition of a few percent of the relevant phosphors is sufficient, and in particular the integration into a solid polymer matrix is favorable in terms of luminosity and stability.

For example, formulations with RADGLO® pigments from Radiant Color NV / Holland or Lumilux® CD pigments from Riedel-de-Haen can be used. Also inorganic phosphors are suitable. As photoluminescent substances, especially with the emission of light in the yellow range, metal sulfides and oxides, usually in combination with suitable activators, have proved favorable. These are available, for example, under the trade name Lumilux® N or as luminescent pigments improved in terms of stability, luminosity and persistence under the trade name LumiNova® from Nemoto / Japan.

Also suitable in principle are phosphors which are produced by electron beams, X-rays and the like. are excited as well as thermochromic pigments reversibly change in temperature change. The use of electrically conductive colors is possible.

When selecting the color pigments, care must be taken that they are sufficiently stable for the further production process of the labels (for example adhesive coating) and that they are not irreversible in the process conditions (optionally thermal drying, electron beam or UV curing, etc.). change.

The security tag is protected from external access because the print is embedded, for example, between the label film and the adhesive layer. Subsequent manipulations are not to be feared, since a replacement is possible only with destruction.

Customer-specific "fingerprints" of the labels can be realized by printing different colors or patterns. Particularly regular line and line patterns create characteristic patterns of luminous dots on the edges of the labels and are also particularly cost-saving and material-saving. After punching or laser cutting of the label and the application on the adhesive substrates a pattern with respect to colors and geometries can be identified by selecting a suitable illumination source at the edge of the label.

Especially logistical and cost-wise, the advantage of this security marking makes itself felt. Commercially available inks and non-specific labelstock can be used while the latter is otherwise customizable. However, since such standard pre-material is only used by the label manufacturers as an intermediate product for their own production and is not freely available on the market, unauthorized access is ruled out. In addition, small lot sizes and short delivery times are possible.

• 10 Gew.-% UV-Tronic HM Lumineszenspaste 806.025
• 90 Gew.-% Bargoscreen UV-Serie 78-2 "transparent"

(beide Farbkomponenten von der Firma SICPA Druckfarben GmbH)
Beide Komponenten werden intensiv vermischt und mit 2 Gew.-% UV-Tronic Fotoinitiator 806.330 versetzt.As a color, in one possible embodiment, a UV screen printing ink can be selected, which is prepared according to the following recipe:

• 10% by weight UV-Tronic HM Luminescent Paste 806.025
• 90% by weight Bargoscreen UV series 78-2 "transparent"

(both color components from SICPA Druckfarben GmbH)
Both components are mixed thoroughly and mixed with 2 wt .-% UV-Tronic photoinitiator 806.330.

Different adhesive systems can be used to create a composite for labels with intermediate pressure. Suitable adhesives for laminating are, for example, UV flexographic laminating adhesives, hotmelt laminating adhesives, pressure-sensitive adhesives, 2-component adhesives or the like.

UV laminating adhesives have proved to be advantageous. For example, with the laminating adhesive UV 9402 from Akzo, such a composite of the counterprinted first printing material web with the second printing material web, the self-adhesive material, can be produced.

Particularly advantageous for the labels according to the invention are hotmelt laminating adhesives. For example, the hot melt laminating adhesive A2700 from Novamelt, which is applied with a slot die, in particular one with a rotary rod.

Likewise, hotmelt PSAs are outstandingly suitable for lamination during interlayer printing, as well as for self-adhesive coating in counter-pressure.

The labels according to the invention may contain, as a laminating adhesive, a self-adhesive composition based on natural rubber, PUR, acrylates or styrene-isoprene-styrene block copolymers.

The use of adhesives based on natural rubber, acrylates or styrene-isoprene-styrene is known, which is also known, for example, in US Pat. Handbook of Pressure Sensitive Adhesive Technology ", second edition, edited by Donatas Satas, Van Nostrand Reinhold, New York, 1989 is described.

As an adhesive, it has proven to be particularly advantageous to use an acrylate hotmelt base which has a K value of at least 20, in particular greater than 30, obtainable by concentrating a solution of such a composition into a system which can be processed as a hotmelt.

The concentration can take place in suitably equipped boilers or extruders, in particular in the concomitant degassing a vented extruder is preferred.

Such an adhesive is in the DE 43 13 008 A1 explained.

These acrylate masses produced in this way are completely removed from the solvent in an intermediate step.

In addition, further volatile constituents are removed. After coating from the melt, these materials have only low levels of volatile components. Thus, all claimed in the above-mentioned patent monomers / formulations can be adopted. Another advantage of the compositions described in the patent is the fact that they have a high K value and thus a high molecular weight. It is known to those skilled in the art that systems with higher molecular weights can be crosslinked more efficiently. This reduces the proportion of volatile components accordingly.

The solution of the composition may contain from 5 to 80% by weight, in particular from 30 to 70% by weight, of solvent.

Commercially available solvents are preferably used, in particular low-boiling hydrocarbons, ketones, alcohols and / or esters.

Further preferably, single-screw, twin-screw or multi-screw extruders with one or in particular two or more degassing units are used. In the adhesive based on Acrylathotmelt-based benzoin derivatives may be copolymerized, such as benzoin acrylate or benzoin methacrylate, acrylic acid or methacrylic acid ester. Such benzoin derivatives are in the EP 0 578 151 A1 described.

The adhesive on Acrylathotmelt-based but can also be chemically crosslinked.

In a particularly preferred embodiment, self-adhesive compositions of (meth) acrylic acid and esters thereof having 1 to 25 carbon atoms, maleic, fumaric and / or itaconic acid and / or their esters, substituted (meth) acrylamides, maleic anhydride and other vinyl compounds , used as vinyl esters, in particular vinyl acetate, vinyl alcohols and / or vinyl ethers.

The residual solvent content should be below 1% by weight.

An adhesive which is particularly suitable is a low molecular weight acrylate hot melt pressure-sensitive adhesive, such as that marketed under the name acResin UV or Acronal®, in particular Acronal DS 3458, by BASF. This adhesive with a low K value obtains its application-oriented properties through a final radiation-induced crosslinking.

Furthermore, as a laminating adhesive, an adhesive may be used which consists of the group of natural rubbers or of the synthetic rubbers or of any blend of natural rubbers and / or synthetic rubbers, the natural rubber or the natural rubbers basically being made of all available qualities, such as Crepe, RSS. Depending on the required level of purity and viscosity, and the synthetic rubber or synthetic rubbers from the group of randomly copolymerized styrene-butadiene rubbers (SBR), the butadiene rubbers (BR), the synthetic,. ADS, TSR or CV types Polyisoprenes (IR), the butyl rubbers (IIR), the halogenated butyl rubbers (XIIR), the acrylate rubbers (ACM), the ethylene-vinyl acetate copolymers (EVA) and the polyurethanes and / or their blends can be selected.

Further, it is preferable to add to the rubbers, for the purpose of improving the processability, thermoplastic elastomers having a weight proportion of 10 to 50% by weight, based on the total elastomer content.

Representative may be mentioned at this point especially the most compatible styrene-isoprene-styrene (SIS) - and styrene-butadiene-styrene (SBS) types.

As tackifying resins, all previously known adhesive resins described in the literature can be used without exception. Mention may be made representative of the rosins, 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 can be used to adjust the properties of the resulting adhesive as desired. On the presentation of the knowledge in the " Handbook of Pressure Sensitive Adhesive Technology "by Donatas Satas (van Nostrand, 1989 ) is explicitly pointed out.

Hydrocarbon resin is a collective term for thermoplastic, colorless to intense brown colored polymers having a molecular weight of generally <2000.

They can be classified according to their provenance in three major groups: In petroleum, coal tar and terpene resins. The most important coal tar resins are the coumarone-indene resins. The hydrocarbon resins are obtained by polymerization of the unsaturated compounds which can be isolated from the raw materials.

The 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 .

They are soluble in organic solvents such as ethers, esters, ketones and chlorinated hydrocarbons, insoluble in alcohols and water.

Rosin resin is understood to mean a natural resin derived from the crude resin of conifers. There are three types of rosin: balsam resin as distillation residue of turpentine oil, root resin as extract of coniferous rootstocks and tall resin, the distillation residue of tall oil. The most important in terms of quantity is 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 as in vegetable and mineral oils. The softening point of rosin is in the 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 C20H30O2, 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.

As softener, it is possible to use all known softening substances. These include, among others, the paraffinic and naphthenic oils, (functionalized) oligomers such as oligobutadienes, isoprenes, liquid nitrile rubbers, liquid terpene resins, vegetable and animal oils and fats, phthalates, functionalized acrylates.

For the purpose of thermally induced chemical crosslinking are all known thermally activatable chemical crosslinkers such as accelerated sulfur or sulfur donor systems, isocyanate systems, reactive melamine, formaldehyde and (optionally halogenated) phenol-formaldehyde or reactive phenolic or Diisocyanatvernetzungssysteme 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 effected by IR radiation or high-energy alternating fields.

The label according to the invention has all possible uses. Particularly advantageous is the use of the label on packaging such as tubes, jars, cans or bottles made of glass, plastic or metal, in particular in the embodiment with silver print and relief varnish. The label then looks very attractive and has a very attractive effect on potential customers when placed on the packaging accordingly.

The label according to the invention can be produced very advantageously in particular by the following methods.

With regard to the interlayer printing, a method is shown in which labels with both counter-printed as well as frontal printed elements can be produced in one operation.

With regard to the counterpressure, however, a method for the production of labels is described, in which the application of counter-printed and frontal printed elements or of elements produced according to one of these types of printing alone, provided in one operation with the coating of a self-adhesive and the lamination of the carrier material he follows.

• die Bedruckstoffbahn bedruckt, und zwar auf der Seite, welche zur Klebemasse ausgerichtet ist (Konterdruck), und auf der gegenüberliegenden Seite (Frontaldruck), und im gleichen Arbeitsgang
• eine trennbeschichtete Trägerbahn zugeführt und eine Selbstklebemasse einseitig auf eine der beiden Bahnen, in der Regel auf die Trennschicht der Trägerbahn, aufgetragen, so dass beim anschließenden Zusammenkaschieren ein Verbund hergestellt wird zwischen mit Bedruckstoff und Träger.

In a first process for the production of labels is in a working process

• printed on the substrate, on the side which is aligned to the adhesive (counter pressure), and on the opposite side (frontal pressure), and in the same operation
• fed to a release-coated carrier web and a self-adhesive one-sided on one of the two webs, usually applied to the release layer of the carrier web, so that in the subsequent Zusammenkaschieren a composite is produced between with substrate and carrier.

The invention is in no way restricted in an alternative method of preparation in the form of printing on both sides of the printing material or the first printing material web prior to lamination. In this case, first with the help of a turning cross successively printed on both sides of the web and then the lamination takes place.

In the preferred embodiment, the composite is turned after lamination with the aid of a turning cross.

• Auf einer der beiden Abwicklungen wird eine Rolle mit einem Trägermaterial, beispielsweise einem Trennpapier abgerollt.
• Auf einer weiteren Abwicklung wird eine Rolle mit der Bedruckstoffbahn abgerollt.
• Die Bedruckstoffbahn wird mit einer beliebigen Anzahl der zur Verfügung stehenden Druckstationen bedruckt.

Another advantageous method comprises the following steps:

• On one of the two developments, a roll is unrolled with a carrier material, for example a release paper.
• On a further development a roll with the printing material web is unrolled.
• The substrate web is printed with any number of available printing stations.

• Das Trägermaterial wird auf der trennbeschichteten Seite mit einer Selbstklebemasse beschichtet.
• Das Trägermaterial und die Bedruckstoffbahn werden derart zusammenkaschiert, dass die Selbstklebemasse den Druck auf der Bedruckstoffbahn bedeckt.
• Anschließend wird die kaschierte Bahn in der Maschine gewendet.
• Die Oberseite der Bedruckstoffbahn kann nun, entsprechend der noch zur Verfügung stehenden Druckwerke, bedruckt werden.

This is done optionally in offset, book, flexo, screen printing, especially in gravure printing.

• The support material is coated on the release-coated side with a self-adhesive.
• The carrier material and the printing material web are laminated together in such a way that the self-adhesive composition covers the print on the printing material web.
• Subsequently, the laminated web is turned in the machine.
• The top of the printing material can now be printed according to the still available printing units.

• Gegebenenfalls findet eine Stanzung der einzelnen Etiketten statt.
• Gegebenenfalls findet eine Aufrollung der Etikettenbahn statt.
  Anhand der nachfolgend beschriebenen Figuren wird dieses Verfahren in einer besonders vorteilhaften Ausführung der dazu erforderlichen Anlage näher erläutert, ohne damit die Erfindung unnötig einschränken zu wollen. Es zeigen

  Figur 1

  Die zur Herstellung des Etiketts erforderliche Anlage von der Abwicklung bis zum Druckwerk 2,

  Figur 2

  die zur Herstellung des Etiketts erforderliche Anlage mit den Druckwerken 2 bis 4, der Hotmelt-Beschichtungs-Anlage, der Kaschierstation und dem Wendekreuz W und

  Figur 3

  die zur Herstellung des Etiketts erforderliche Anlage vom Druckwerk 4 bis zur Aufwicklung.

This is done optionally in offset, book, flexo, gravure, in particular in Siebduckverfahren.

• Optionally, a punching of the individual labels takes place.
• Optionally, a reeling of the label web takes place.
  With reference to the figures described below, this method is explained in more detail in a particularly advantageous embodiment of the system required for this purpose, without wishing to unnecessarily limit the invention. Show it

  FIG. 1

  The system required for the production of the label from the settlement to the printing unit 2,

  FIG. 2

  the system required for the production of the label with the printing units 2 to 4, the hot-melt coating system, the laminating station and the turning cross W and

  FIG. 3

  the required for the production of the label system from the printing unit 4 to the winding.

As in the FIGS. 1 to 3 illustrated by way of example, in a specially designed label printing machine, on one of the two developments, here in the development A1, a roll with a carrier material and at a further development, here in the development A2 a roll with the printing material unrolled.

In station C2, a two-sided corona pretreatment of the film surfaces is generally carried out.

The printing material web is provided in the printing units D1 to D (x), shown here in the printing units D1 to D3, with the desired imprint. On the release-coated side of the carrier material, a self-adhesive mass is coated in the laminating station K. Subsequently, the carrier material and the printing material web are laminated together in such a way that the self-adhesive composition covers the pressure on the first carrier layer.

An alternative manufacturing method is in FIG. 2 This represents the coating of the self-adhesive composition in the flexo process.

Subsequently, in the turning cross W, the turn of the laminated web is effected, so that the upper side of the printing material web in the printing units D (x + 1) to D (z), shown here in the printing units D4 to D8, can be printed.

In the Rotostanze RS a punching of the individual labels takes place and then takes place the grid deduction G. Subsequently, the label web EB is rolled up.

An advantage of the method according to the invention is that the self-adhesive coating can take place at any position of the machine, ie at each of the printing units D1 to D (z), in the illustrated case D1 to D8, with a lamination on the printing unit D3. There are thus any combinations between counterpressure (K) and frontal pressure (F) possible: K = 1 to z; F = 1 to (z-K).

The pressure-sensitive adhesive in this case is coated indirectly, that is to say first on the support material, preferably a silicone film, this being not a limitation of this invention, since self-adhesive coating on the printed web prior to lamination to the support material is also feasible.

• Auf einer der beiden Abwicklungen wird eine Rolle Selbstklebe-Material mit der zweiten Bedruckstoffbahn, auf welcher eine Selbstklebemasse vorhanden ist, die mit einem Trägermaterial eingedeckt ist, abgerollt.
• An einer weiteren Abwicklung wird eine Rolle mit der ersten Bedruckstoffbahn abgerollt.
• Die erste Bedruckstoffbahn wird nun mit einer beliebigen Anzahl der zur Verfügung stehenden Druckstationen bedruckt.

The second method comprises the following steps:

• On one of the two developments, a roll of self-adhesive material is unrolled with the second printing material web, on which a self-adhesive composition is provided, which is covered with a carrier material.
• At a further processing a roll with the first printing material web is unrolled.
• The first substrate web is now printed with any number of available printing stations.

• Die zweite Beduckstoffbahn und die erste Bedruckstoffbahn werden derart zusammenkaschiert, dass der Kaschierklebstoff den Druck auf der ersten Bedruckstoffbahn bedeckt.
• Anschließend wird die kaschierte Bahn in der Maschine gewendet.
• Die Oberseite der ersten Bedruckstoffbahn wird nun entsprechend der noch zur Verfügung stehenden Druckwerke bedruckt.

This is done optionally in offset, book, flexo, screen printing, especially in gravure printing.

• The second printing material web and the first printing material web are laminated together in such a way that the laminating adhesive covers the print on the first printing material web.
• Subsequently, the laminated web is turned in the machine.
• The top of the first substrate web is now printed according to the still available printing units.

• Gegebenenfalls findet eine Stanzung der einzelnen Etiketten statt.
• Gegebenenfalls findet eine Aufrollung der Etikettenbahn statt.

This is done optionally in offset, book, flexo, gravure, in particular in Siebduckverfahren.

• Optionally, a punching of the individual labels takes place.
• Optionally, a reeling of the label web takes place.

Figur 4

die zur Herstellung des Etiketts erforderliche Anlage von der Abwicklung bis zum Druckwerk 2,

Figur 5

die zur Herstellung des Etiketts erforderliche Anlage mit den Druckwerken 2 bis 5, der Kaschierstation und dem Wendekreuz und

Figur 6

die zur Herstellung des Etiketts erforderliche Anlage vom Druckwerk 4 bis zur Aufwicklung

With reference to the figures described below, this method is explained in more detail in a particularly advantageous embodiment of the system required for this purpose, without wishing to unnecessarily limit the invention. Show it

FIG. 4

the required for the production of the label system from the settlement to the printing unit 2,

FIG. 5

the system required for the production of the label with the printing units 2 to 5, the laminating and the turning cross and

FIG. 6

the required for the production of the label system from the printing unit 4 to the winding

As in the FIGS. 4 to 6 illustrated by way of example, in a specially designed label printing machine, at one of the two developments, here in the development A1, a roll with the second printing substrate, a self-adhesive material, consisting of printing material, self-adhesive and carrier material handled. At a further processing, here in the processing A2, a roll with the first printing material web is unrolled.

In the stations C1 and C2, a one- or two-sided corona pretreatment of the material surfaces takes place.

The first substrate web is in the printing units D1 to D (x), shown here in the printing units D1 to D3, provided with the desired imprint (pad pressure).

The second printing material web and the first printing material web are laminated together in the laminating station K in such a way that the adhesive covers the pressure on the first carrier layer.

An alternative, very advantageous manufacturing method is in FIG. 5 This represents the coating of the self-adhesive composition in the hotmelt process.

Subsequently, in the turning cross W, the turn of the laminated web is effected, so that the upper side of the first printing material web in the printing units D (x + 1) to D (z), shown here in the printing units D4 to D8, can be printed.

In the Rotostanze RS a punching of the individual labels takes place and then the grid deduction G.

Subsequently, the label web EB is rolled up.

An advantage of the method according to the invention is that the lamination can take place at any position of the machine, ie at each of the printing units D1 to D (z), in the illustrated case D1 to D8, with a lamination on the printing unit D3. There are thus any combinations between counterpressure (K) and frontal pressure (F) possible: K = 1 to z; F = 1 to (z-K).

The label according to the invention has elements which may be produced once by the frontal printing method and then further elements which are produced after the counter or interlayer printing. The label combines the advantages of both printing process variants.

Certain printing inks are internal (interlayer printing or reverse printing), in combination with printing inks overhead (frontal printing).

Both methods have advantages. The interlayer pressure is used, for example, to achieve a good, inexpensive silver print, in frontal pressure to achieve a better relief effect (usually screen printing). It is also an advantage of the counter-pressure that the printing inks are protected against media (fillings, chemicals, etc.).

In the following, the invention will be explained further with reference to two examples, again without wishing to unnecessarily limit the invention.

Examples Example 1 (counter / front pressure)

• foil
  Biaxially stretched, coextruded polypropylene-based film from BIMO corona-treated on both sides

  Film thickness:

  60 μm (STILAN MP / B 60)

  Elongation at break MD:

  200% (ASTM D 882)

  Elongation at break TD:

  70% (ASTM D 882)

  Modulus of elasticity MD:

  2000 N / mm ² (ASTM D 882)

  Young's modulus TD:

  3400 N / mm ² (ASTM D 882)

• Silicone film (release film)
  Commercially available silicone film from Siliconatura
  Film thickness: 30 μm PET (Silphan S 30 M74F)
  (or silicone paper)
• printing inks
  UV-curable offset / flexo / book / screen printing ink or solvent-containing gravure ink, such as those offered by Akzo, for example, series Flexocure for UV flexo printing
• adhesive
  Acrylate hot melt pressure-sensitive adhesive for producing a self-adhesive material, for example Acronal DS 3458, from BASF

The adhesive is applied over the entire area by means of a slot die (for example Nordson BC 40, rotating rod principle) and UV-crosslinked.

(Alternatively, flexo-UV pressure-sensitive adhesives or dispersion / solvent pressure-sensitive adhesives may be used.)

11

Frontaldruck

1

Bedruckstoff 60 µm PP-Folie

12

Konterdruck

2

Druckempfindlicher Kleber

3

Silikonfolie/-Papier

The FIG. 7 shows a label according to the invention with the following layers:

11

Surface print

1

Substrate 60 μm PP film

12

counterprint

2

Pressure sensitive adhesive

3

Silicone film / -paper

Example 2 (liner / frontal print :)

• laminating
  Biaxially stretched, coextruded polypropylene-based film from BIMO corona-treated on both sides

  Film thickness:

  30 μm (STILAN BS)

  Elongation at break MD:

  200% (ASTM D 882)

  Elongation at break TD:

  70% (ASTM D 882)

  Modulus of elasticity MD:

  2000 N / mm ² (ASTM D 882)

  Young's modulus TD:

  3400 N / mm ² (ASTM D 882)

• Self-adhesive material
  commercially available label material from Raflatac,

  Top film:

  30 μm polypropylene

  PSA:

  Any pressure-sensitive adhesive which is suitable for label material

  used

  For example, based on acrylate (Raflatac, RP 37)

  silicone film

  Polyester 36 μm (or silicon paper)

• printing inks
  UV-curable offset / flexo / book / screen printing ink or solvent-containing gravure ink, such as those offered by Akzo, for example, series Flexocure for UV flexo printing.
• laminating adhesive
  suitable laminating adhesive for laminating the film with the self-adhesive material, for example UV flexo-laminating adhesive (Akzo, UV 9402), hotmelt laminating adhesive, pressure sensitive adhesives, hot melt pressure sensitive adhesive, 2-component adhesive o. Ä.

11

Frontaldruck

5

1. Bedruckstoffbahn
30 µm PP-Folie

12

Konterdruck

4

Kaschierklebstoff

1

2. Bedruckstoffbahn
30 µm PP-Folie
(Grundetikett)

2

Druckempfindlicher Kleber

3

Silikonfolie/-Papier

The FIG. 8 shows a label according to the invention with the following layers:

11

Surface print

5

1. substrate web
30 μm PP film

12

counterprint

4

laminating adhesive

1

2. substrate web
30 μm PP film
(Base label)

2

Pressure sensitive adhesive

3

Silicone film / -paper

Claims (12)

1. Label comprising at least one first transparent print substrate layer (5) printed on one side with a self-adhesive composition (4) which if desired is lined with a release paper (3) or a release film (3), where on the first print substrate layer (5) first, on the underside directed toward the adhesive (4) a printing ink (12) has been printed by transfer printing, so that there is a printing ink (12) between print substrate layer (5) and adhesive (4), and
   secondly, on the top face opposite the adhesive surface, a further printing ink (11) has been printed by frontal printing, so that there is a further printing ink (11) on the top face of the print substrate layer (5), characterized in that
   the self-adhesive composition (4) is based on an acrylate hotmelt, having a K value of at least 20.
2. Label according to Claim 1, characterized in that below the adhesive (4) there is a second print substrate layer (1) whose underside is coated with a self-adhesive composition (2) which if desired is lined with a release paper (3) or a release film (3).
3. Label according to at least one of the above claims, characterized in that the printing ink (12) on the underside of the first print substrate layer (5) is metallic in colour, for example silver-coloured.
4. Label according to at least one of the above claims, characterized in that, in addition to the printing (12), in particular with metal colours, on the underside of the first print substrate layer (5), a printing (11), in particular a printing (11) with a transparent relief varnish is present at the same places on the top face.
5. Use of a label according to at least one of the above claims on packaging forms such as tubes, trays, cans or bottles made of glass, plastic or metal.
6. Process for producing labels according to at least one of the above claims, in which in one operation the print substrate web (5) can be printed on the side directed toward the adhesive (4) and on the opposite side, and in the same operation a release-coated carrier web is introduced and a self-adhesive composition is applied to one side of one of the two webs, generally to the release layer of the carrier web, so that during subsequent lamination an assembly is produced between print substrate (5) and carrier.
7. Process according to Claim 8, characterized in that instead of the carrier web a second print substrate layer (1) is laminated on, whose underside is coated with a self-adhesive material (2) which if desired is lined with a release paper (3) or release film (3).
8. Process according to Claim 8 or 9, characterized in that lamination takes place following the printing of the underside of the print substrate (5) or of the first print substrate layer (5).
9. Process according to at least one of Claims 8 to 10 above, characterized in that the printing ink (11) is applied by frontal printing to the top face of the print substrate (5) or of the first print substrate layer (5) after lamination has taken place.
10. Process according to at least one of the above Claims 8 to 11, characterized in that lamination is carried out using a UV-curing acrylic hotmelt pressure sensitive adhesive, which is applied using a slot die.
11. Process for producing a label according to at least one of the above claims, characterized in that
    a reel with a carrier material, such as a release paper, is unrolled from one of the two unwinders (A1, A2),
    on another unwinder, a reel with the print substrate web (5) is unrolled,
    the print substrate web (5) is printed with any number of the available printing stations (D1 to D(x)), selectively by offset, letterpress, flexographic or screen printing, in particular by gravure printing,
    the carrier material is coated on the release-coated side with a self-adhesive composition (4),
    the carrier material and the print substrate web (5) are laminated to one another so that the self-adhesive composition (4) covers the printing (12) on the print substrate web (5),
    the laminated web is then turned in the machine,
    the top face of the print substrate web (5) can then be printed in accordance with the printing units (D1 to D(x)) still available, selectively by offset, letterpress, flexographic or gravure printing, in particular by screen printing,
    if desired, the individual labels are die-cut,
    if desired, the label web (EB) is rolled up.
12. Process for producing a label according to at least one of the above claims, characterized in that
    a reel of self-adhesive material with the second print substrate web (1), on which there is self-adhesive composition (2) lined with a carrier material (3), is unrolled from one of the two unwinders (A1, A2),
    on another unwinder (A1, A2), a reel with the first print substrate web (5) is unrolled, the first print substrate web (5) is printed with any number of the available printing stations (D1 to D(x)), selectively by offset, letterpress, flexographic or screen printing, in particular by gravure printing,
    the second print substrate web (1) and the first print substrate web (5) are laminated together in such a way that the laminating adhesive (4) covers the printing on the first print substrate web (5),
    the laminated web is then turned in the machine,
    the top face of the print substrate web (5) is then printed in accordance with the printing units (D1 to D(x)) still available, selectively by offset, letterpress, flexographic or gravure printing, in particular by screen printing,
    if desired, the individual labels are die-cut,
    if desired, the label web (EB) is rolled up.

Images