EP2172347B1 - Transfer film and cold film transfer method - Google Patents

Transfer film and cold film transfer method Download PDF

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Publication number
EP2172347B1
EP2172347B1 EP09011629.4A EP09011629A EP2172347B1 EP 2172347 B1 EP2172347 B1 EP 2172347B1 EP 09011629 A EP09011629 A EP 09011629A EP 2172347 B1 EP2172347 B1 EP 2172347B1
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EP
European Patent Office
Prior art keywords
transfer
film
layer
adhesive
cold
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Application number
EP09011629.4A
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German (de)
French (fr)
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EP2172347A2 (en
EP2172347A3 (en
Inventor
Ulrike Dr. Plaia
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Kurz Leonhard Stiftung and Co KG
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Kurz Leonhard Stiftung and Co KG
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Priority to DE102008047095A priority Critical patent/DE102008047095A1/en
Application filed by Kurz Leonhard Stiftung and Co KG filed Critical Kurz Leonhard Stiftung and Co KG
Publication of EP2172347A2 publication Critical patent/EP2172347A2/en
Publication of EP2172347A3 publication Critical patent/EP2172347A3/en
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Publication of EP2172347B1 publication Critical patent/EP2172347B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17Dry transfer
    • B44C1/1712Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17Dry transfer
    • B44C1/1712Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive
    • B44C1/1716Decalcomanias provided with a particular decorative layer, e.g. specially adapted to allow the formation of a metallic or dyestuff layer on a substrate unsuitable for direct deposition
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17Dry transfer
    • B44C1/1733Decalcomanias applied under pressure only, e.g. provided with a pressure sensitive adhesive
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17Dry transfer
    • B44C1/1733Decalcomanias applied under pressure only, e.g. provided with a pressure sensitive adhesive
    • B44C1/1741Decalcomanias provided with a layer being specially adapted to facilitate their release from a temporary carrier

Description

  • The invention relates to a transfer film designed for use in a cold foil transfer process.
  • In the case of cold foil transfer, also referred to as cold foil stamping or cold foiling, a transfer film consisting of a carrier film, optionally a release layer and a transfer layer detachable from the carrier film, is usually combined in a printing unit with a substrate previously in an adhesive applicator on its surface facing the transfer film was provided with a full-surface or patterned cold adhesive layer. In the regions of the substrate coated with the adhesive layer, the transfer layer of the transfer film is fixed to the substrate and detached from the carrier film. The used transfer film comprising the carrier film, the optional release layer and optionally not transferred to the substrate remnants of the transfer layer is wound while the transfer layer coated substrate is transported further to optionally subsequent processing steps, coating or printing operations, Umwendevorgänge and punching or To perform cutting operations. The printing unit for film application is usually formed from a smooth pressure roller and a likewise smooth counter-pressure roller, which press the substrate and the transfer sheet against each other, wherein the coming into contact with the transfer sheet pressure roller is covered in particular with a compressible blanket or blanket.
  • The EP 0 578 706 A , equals to WO 92/17338 A1 U.S. Patent No. 5,134,642 describes a film printing method and a film transfer machine which are used for cold foil coating of surfaces of substrates by means of transfer films. There is one Adhesive applicator for pattern-wise application of an adhesive to a substrate, a printing unit for film application and a pressing plant for fixing the applied transfer layer areas provided on the substrate under application of high pressure.
  • The EP 1 880 848 A2 discloses an apparatus and a method for transferring layers of a transfer film to a substrate or a substrate by means of a cold embossing device, wherein a film application module is used in a sheet-fed rotary printing machine. A turning device allows the reversal of the substrate and a double-sided printing and / or embossing of the substrate. In particular, further coating or printing units are connected upstream and / or downstream of the film application module.
  • From the DE 103 49 963 A1 It is known to carry out a cold foil transfer process using a radiation-crosslinking adhesive. In this case, an adhesive which crosslinks under UV irradiation is used in particular, so that neither heat nor increased pressure is required for fixing the transfer layer to adhesive-coated regions of a substrate. The WO 03/020519 A1 discloses a method of applying a transferable layer from a film to a substrate by first applying an adhesive in a pattern to the substrate and the film using a droplet deposition head. Thereafter, the adhesive is cured and the transferable layer transferred from the film to the substrate according to the pattern.
  • The DE 40 21 908 A1 relates to a multilayer optically variable element comprising an adhesive layer, an optically variable effect layer, a protective layer and a peelable backing layer, wherein the protective layer is formed as a self-supporting and dimensionally stable layer having a thickness of a few micrometers.
  • The US 3,726,710 discloses curable silicone release compositions containing a crosslinkable olefinic organopolysiloxane compound and a photosensitizer, and a paper substrate coated therewith. The UV exposure of the adhesive takes place in practice after a combination of transfer film and substrate or of transfer layer and substrate. It is necessary that either the transfer film, the transfer layer or the substrate to be coated for the UV radiation used to crosslink the adhesive is at least partially permeable. In order to be able to use a transfer film flexibly in combination with a wide variety of substrates, usually the transfer film or only the transfer layer with a permeability to the UV radiation is provided, wherein currently transfer films or transfer layers with a transmittance of <10% for UV radiation in the range from 250 nm to 400 nm.
  • As a cold adhesive, however, it is known to also use conventional adhesives that cure without pressure and irradiation, or adhesives that cure under the action of pressure in a cold-film transfer process.
  • However, it has been found that the bond between the transfer layer and the substrate is often inadequate, so that areas of the transfer layer are again completely or partially detached from the substrate.
  • Furthermore, it has been found that the printability of the transfer layer embossed on the substrate is inadequate due to the release layer, which is usually based on wax, or that layers printed subsequently onto the transfer layer are poorly adherent.
  • It is therefore an object of the invention to provide a transfer film which can be used in a cold foil transfer process and has a transfer layer with improved printability.
  • A further object of the invention is to provide a suitable cold foil transfer process for processing such transfer films.
  • The object is embodied in a transfer film for use in a cold film transfer process comprising a carrier film and a transfer layer detachable from the carrier film, in which the transfer layer, starting from the carrier film, comprises a transparent polymeric release layer, an optional transparent protective lacquer layer, at least one decorative layer and at least one undercoat layer and in that in a temperature range of 15 to 35 ° C, the separation force of the transfer layer of the carrier film in the range of 15 to 35 cN / cm, in particular in the range of 20 to 30 cN / cm.
  • In the case of a transfer film, the removal force of the release layer from the carrier film and the force for extracting regions from the transfer layer under transfer conditions must generally be less than the adhesion between the substrate and transfer layer, which depends on the type of cold adhesive used and its bonding to the substrate on the one hand and the primer layer on the other. Only then can the transfer layer or regions of the transfer layer detach from the carrier film during transfer and stick to the substrate. Before the transfer, however, the detachment force of the release layer from the carrier film must be so high that a secure handling of the transfer film is ensured without the transfer layer being detached from the carrier film, for example when unwinding the transfer film from a supply roll and / or during transport of the transfer film , optionally via deflection, in a cold foil transfer unit. In order to be able to unwind and unwind the transfer film, it has proven particularly useful to provide a suitable non-stick layer on the side of the carrier film facing away from the transfer layer.
  • In the cold-film transfer method, transfer of the transfer layer to the substrate takes place in a temperature range of 10 to 40 ° C, preferably 15 to 35 ° C. The release force of the transfer layer from the carrier film in the range of 15 to 35 cN / cm, in particular in the range of 20 to 30 cN / cm is low in the temperature range of 15 to 35 ° C compared to a conventional hot stamping foil. In a conventional hot stamping foil, the detaching force of the transfer layer from the carrier foil is adjusted so that it is significantly higher in the temperature range of 10 to 40 ° C, at least by a factor of 2-3 than in the case of the transfer foil, otherwise the transfer position of the hot stamping foil undesirably already before the hot stamping step, eg during storage or transport, could replace. In a conventional hot stamping foil, a peel force of the transfer sheet from the support sheet in the range of 15 to 35 cN / cm becomes effective only in the working temperature range, i.e., in the working temperature range. reached at about 120 to 180 ° C.
  • The peel force indicates the force (usually in the force / length unit) that is to be used to detach two layers from each other; there is a positive correlation between the peel force of a first layer of a second layer and the adhesion between the first and second layers. The determination of the required release force between the carrier film and the transfer layer of the transfer film was determined according to the FINAT test method no. 3 (FTM3, low speed release force).
  • Compared to a conventional transfer layer with a wax-based or silicone-based release layer, in a transfer layer having a polymeric release layer, particularly based on an acrylate copolymer, transfer film peel forces were measured from the support film by up to 250%, in particular up to 150%, higher. However, the transfer layer was still sufficiently removable and, in contrast to transfer layers of transfer films having wax-based or silicone-based release layers, very good overprintable, with a very good adhesion of the dried or cured ink on the transfer layer could be achieved.
  • With regard to the transfer film, it is preferred if the at least one primer layer is formed from a thermoplastic adhesive which can be activated in a temperature range of> 90 ° C.
  • For the transfer film, it is particularly preferred if the release layer is formed free of wax and / or free of silicone. In particular, the transfer film does not have a conventional wax or silicone based release layer, which has heretofore caused transfer layers of transfer films which have been provided with only limited or no conventional printing inks, particularly UV curable inks, UV curable lacquers, hybrid inks or -coats, were printable. Particularly preferred for the transfer film is the use of a release layer based on an acrylate copolymer.
  • The adhesion of printing inks to transfer layer areas of the transfer film transferred to a substrate by cold foil transfer was determined about 1 hour after printing by the following test at room temperature:
    A test pattern in the form of a substrate with the transfer layer applied to it cold and printed on at least portions of the transfer layer was placed on a flat surface. A 13 to 16 cm long strip of Tesafilm 4104 was adhered to it, so that about 5 to 7 cm of the Tesafilms over the edge of the substrate survived. Subsequently, the Tesafilm was pressed with the thumb three to four times and finally subtracted at an angle of> 90 ° from the test pattern. The test was passed when 90% of the ink remained on the test sample or the test sample itself was torn.
  • Printings of a transfer layer with conventional printing inks, in particular with the above-mentioned UV-curing printing inks, UV-curing lacquers, hybrid inks or lacquers, adhered excellently to the transfer position, so that the test could be considered very good.
  • The release layer of the transfer film is preferably designed such that it separates from the carrier film and remains completely on the transfer layer. The adhesion of the release layer to the carrier film in the temperature range of 15 to 35 ° C is lower than the adhesion of the release layer to the adjacent layers of the transfer layer adjacent thereto; that is, the peel force of the peel layer from the optional resist layer or the decorative layer is greater than the peel force of the peel layer from the backing film. The release force of the release layer from the optional protective lacquer layer or the decorative layer in the temperature range from 15 to 35 ° C. is preferably at least 1.5 times greater than the removal force of the release layer from the carrier foil.
  • However, the release layer can also be designed such that the detachment force of the release layer from the carrier film in a temperature range of 15 to 35 ° C greater, in particular at least 1.5 times greater than the separation force of the release layer of an adjoining layer of the transfer layer, in particular the optional protective lacquer layer or the decorative layer is. In this case, when the carrier film is removed from the transfer layer, the release layer remains completely or partially on the carrier film. It is advantageous if the transfer film between the release layer and the at least one decorative layer has a protective lacquer layer which is easy to print. After peeling off the carrier film and the at least partially adhering release layer from the transfer film, the protective lacquer layer forms the uppermost, outer layer of the transfer layer and can be printed with conventional printing inks.
  • The release layer of a cold-transferred transfer layer of the transfer film is preferably formed with a surface tension in the range of 45 to 60 mN / m, in particular in the range of 50 to 55 mN / m, wherein the surface tension was determined by means of a contact angle measurement at about 20 ° C. In this case, a disperse fraction in the range of 40 to 50 mN / m, in particular in the range of 40 to 45 mN / m, and a polar fraction in the range of 5 to 15 mN / m, in particular in the range of 8 to 11 mN / m determined.
  • In comparison, conventional wax release layers have surface tensions in the range of 30 to 45 mN / m, especially in the range from 35 to 40 mN / m, wherein the surface tension was also determined by means of a contact angle measurement at about 20 ° C. In this case, a disperse fraction in the range from 30 to 40 mN / m, in particular in the range from 33 to 38 mN / m, and a polar fraction in the range from 1 to 5 mN / m, in particular from 3 to 4 mN / m were determined here ,
  • There was a marked difference between the absolute values of the surface tensions. Furthermore, it has been found that significant differences also occur in particular between the polar components of the surface tension of a release layer of the transfer film and a wax-based, conventional release layer. At present, it is assumed that with increasing surface tension, in particular with an increasing polar fraction of the surface tension, the overprintability of a release layer improves.
  • The release layer preferably has a thickness in the range from 0.01 to 0.5 μm, preferably in the range from 0.01 to 0.3 μm, more preferably from 0.1 to 0.2 μm. This comparatively small thickness of the release layer allows a sharp and clean detachment of the transfer layer from the transfer film. The thereby achievable accuracy and the achievable resolution can comparatively accurate to the layout of partially, preferably on the substrate, applied cold glue layer, without departing substantially, whereby a high register accuracy of the cold foil layout can be achieved to a possibly existing print layout of conventional inks. Due to the small thickness of the release layer, only very small and very few so-called flakes, ie small remainders of the transfer layer of the transfer film, which can be disruptive in subsequent process steps and / or disturb the visual appearance of the coated substrate, are produced in this sharp partial detachment. Due to the comparatively small thickness of the release layer, resolutions are achievable that are below the resolution of the human eye. Also of advantage in a thin release layer is the only small detachment force which is to be used during the separation of the layers during partial transfer.
  • It has proven useful if the at least one primer layer has a thickness in the range from 1 μm to 5 μm, in particular in the range from 1.5 μm to 3 μm. Furthermore, the at least one primer layer can be colored and, for example, enhance a contrast to the substrate.
  • Furthermore, it has proven useful if the at least one primer layer which is intended to adjoin the cold adhesive has a surface roughness in the range from 100 to 180 nm, in particular in the range from 120 to 160 nm. The surface roughness is determined inter alia by the application method and the formulation of the primer layer. It has been found that a lower surface roughness, but surprisingly also a higher surface roughness of the primer layer, leads to a reduction in the achievable adhesion between a cold adhesive and the transfer layer. The surface roughness of the undercoat layer was determined by means of interference microscopy.
  • Not only one, but also two or more primer layers may be present, differing in their chemical and / or physical properties, on the one hand optimal adhesion towards the adjacent decorative layer (s) and on the other side to achieve optimal adhesion in the direction of reaching the transfer layer cold adhesive, in particular UV adhesive.
  • In particular, a residual adhesion (Tesatest, see above) between the transfer layer and the substrate is achieved, wherein when using a conventional drying cold adhesive Tesatest after a few minutes and when using a UV adhesive Tesatest immediately after exposure to UV light could be counted as passed. Over 90% of the transfer layer remained on the substrate.
  • In particular, it has proven useful if the transfer film, if appropriate also only its transfer layer, for UV radiation in the wavelength range from 250 nm to 400 nm, a transmittance in the range of 5 to 70%, in particular in the range of 20 up to 40%. As a result, particularly rapid and, in particular, complete curing of a cold adhesive based on an adhesive crosslinking under UV irradiation on the substrate becomes possible, whereby the adhesion of the transfer layer to the substrate is further improved. Because only at a sufficiently high irradiation amount of the crosslinking under UV irradiation adhesive is completely crosslinked and cured and achieves a high bond strength, so that a detachment of transferred to the substrate transfer layer areas is reliably prevented by the substrate. Decisive for the UV transparency of a transfer film here is the layer of a transfer film, which has the lowest UV permeability of all existing layers.
  • The carrier film preferably has a thickness in the range of 7 to 23 μm. The carrier film is preferably formed from polyester, polyolefin, polyvinyl, polyimide or ABS. Particularly preferred in this case is the use of carrier films made of PET, PC, PP, PE, PVC or PS. In particular, a carrier film made of PET has been proven.
  • Overall, the transfer film has in particular a thickness in the range from 9 to 25 μm, in particular in the range from 13 to 16 μm.
  • It has proven useful if the transfer layer has a protective lacquer layer. In particular, the protective lacquer layer provides protection against mechanical and / or chemical stress on the transfer layer on a substrate. The protective lacquer layer preferably has a thickness in the range from 0.8 to 3 .mu.m, in particular from 0.9 to 1.3 .mu.m, and may further be clear or colorless or colored or at least partially colored.
  • The at least one decorative layer of the transfer layer is preferably formed by a metallic layer or a dielectric layer. It has proven useful if the at least one decorative layer has a thickness in the range of 8 to 500 nm.
  • In order to achieve the desired high UV transmittance of the transfer film even when using a decorative layer in the form of a metallic layer when using a UV adhesive as a cold adhesive, it is particularly preferred if the metallic Layer only has a layer thickness in the range of 8 nm to 15 nm, preferably in the range of 10 nm to 12 nm. It is also possible that the metallic layer has a layer thickness in the range of 12 nm to 15 nm. Thus, a good visibility and decorative effect of the metallic layer in combination with a high transmittance of UV radiation is achieved (optical thickness (OD) about 1.2). Conventional transfer films typically use metal layers having a thickness in the range of more than 15 nm in order to achieve optimum brilliance. However, due to the resulting large optical thickness of about 2, such conventional metal layers are not sufficiently UV transmissive for the use of a UV adhesive as a cold glue.
  • It has proven useful if the metallic layer is formed from aluminum, silver, gold, copper, nickel, chromium or an alloy comprising at least two of these metals.
  • The dielectric layer is in particular formed from at least one material of the group comprising metal oxide, polymer or lacquer. A dielectric layer of HRI material, such as SiO x , MgO, TiO x , Al 2 O 3 , ZnO, ZnS, has proven particularly useful. The variable x is preferably in the range of 0 to 3.
  • The decorative layer can in particular also be formed from an HRI material that is permeable in the UV range, such as CdSe, CeTe, Ge, HfO 2 , PbTe, Si, Te, TiCl or ZnTe.
  • It has proven useful if a decorative layer has a diffractive relief structure for producing optically variable effects and / or a macrostructure for generating three-dimensional effects or depth effects. By diffractive relief structures, which are formed in particular in a transparent lacquer layer, depending on the angle of view, different optical effects, so-called optically variable effects, can be achieved, such as holograms, three-dimensional representations with kinematic effect dependent on viewing angle.
  • In order to improve the visibility of relief structures, these are usually arranged adjacent to a highly reflective metallic layer or HRI (HRI) high refractive index (HRI) layer having a comparatively high to very high refractive index, in particular of a metal oxide. Such a highly reflective layer may be formed over the entire surface or pattern.
  • The decorative layer may further comprise a layer of optically variable pigments, luminescent substances, magnetic or electrically conductive substances, a colored lake layer, a thin-film stack with viewing-angle-dependent interference color effect, a liquid crystal layer, or else a combination of the aforementioned layers comprising e.g. Metallic layers and dielectric layers, serve as a decorative layer (s).
  • The object is achieved by a cold foil transfer method in which a cold adhesive, in particular an adhesive crosslinking under UV irradiation, is applied to a substrate and bonded to a transfer layer of a transfer film by combining with the substrate a transfer film comprising a support film and a transfer film The transfer layer comprises, starting from the carrier film, a transparent polymeric release layer, an optional transparent protective lacquer layer, at least one decorative layer and at least one primer layer, and wherein the release force of the transfer layer from the carrier film in a temperature range of 15 to 35 ° C is in the range of 15 to 35 cN / cm, in particular in the range of 20 to 30 cN / cm, wherein when the transfer film is combined with the substrate, the at least one primer layer of the transfer film faces the cold adhesive, and further wherein the cold adhesive is cured et, in particular the adhesive which crosslinks under UV irradiation is irradiated and crosslinked, an adhesive bond being formed with the transfer layer of the transfer film.
  • The cold foil transfer is due to the low demands on the transfer device used, the low preparation and setup times and the high achievable transfer speeds much cheaper and faster to perform than a hot stamping process and therefore enjoys a steadily increasing popularity. In addition, cold foil transfer or Cold foil transfer assemblies relatively easily integrated or mounted in or on common multi-color printing machines.
  • The cold foil transfer process results in a substrate which is completely or only partially coated with a transfer layer and which can be printed particularly well with regard to the transfer foil, in particular because of the special design of the release layer described above in detail.
  • It is particularly preferred to apply a cold adhesive in the form of an adhesive which crosslinks under UV irradiation with the UV radiation from the side of the transfer film or transfer layer, since a very wide variety of substrates, which may be permeable or impermeable to UV radiation, are processed and treated with the same Transfer film can be coated. However, it is just as possible to emit the UV radiation only or in addition from the side of the substrate, provided that it is permeable to the radiation used.
  • The duration of irradiation of the UV adhesive with UV radiation is preferably in the range of less than one second, using, for example, high-pressure mercury lamps, high-pressure mercury doped lamps, carbon arc lamps, xenon arc lamps, metal halide lamps, UV LEDs or suitable UV lasers , Alternatively, an electron beam curing can be performed.
    In sheet-fed printing machines, which process, for example, sheets of 75 cm in length and wherein a range of about 8 to 10 cm of the arc length is irradiated with a UV lamp having a power in the range of 160 to 200 W / cm, thus ca 10000 sheets per hour are processed.
  • As an alternative to applying the cold adhesive, in particular the adhesive which crosslinks under UV irradiation, to the substrate, it is of course also possible for cold adhesives to be applied to the at least one primer layer of the transfer film.
  • In general, the cold adhesive can be applied over the entire surface or only partially to the substrate and / or the primer layer of the transfer film. A pattern-shaped training of transfer layer on the substrate is possible in both cases, since in a full-scale application of cold adhesive only partial activation of the cold adhesive can be done. If, for example, a UV adhesive is used as the cold adhesive, which is applied over the entire surface, for example, to the substrate, then this can be partially exposed after the substrate and transfer film have been brought together, for example via a shadow mask. The UV adhesive is cured only in the exposed areas and fixed there only the transfer layer on the substrate, while in unexposed areas, the transfer layer remains on the carrier film and can be removed with this again from the substrate. The cold adhesive applied over the entire surface to, for example, the substrate can furthermore be exposed in pattern form for the first time so that it already partially cured and no longer be able to develop adhesion if, after being brought into contact with the transfer film, the entire surface is exposed a second time is hardened and the previously uncured adhesive areas and connected to the transfer layer. After peeling off the carrier film from the substrate, the areas which were exposed in a patterned manner the first time now remain without transfer layer.
  • In the case of a pattern-like application of cold glue to the substrate and / or the primer layer of the transfer film, after a combination of substrate and transfer film, the carrier film can be removed from the transfer layer at different times. Thus, the carrier film can be removed immediately after the combination of substrate and transfer film and before curing of the cold adhesive. For this purpose, it is necessary that the adhesion of the transfer layer to the not yet or not yet fully cured cold adhesive is higher than the force required to detach a transfer layer region from the transfer layer and to overcome the adhesion to the carrier film. If an adhesive crosslinking under UV irradiation is used, then a UV permeability of the transfer layer is sufficient here.
    Frequently in sheetfed offset presses this method is used.
  • Alternatively, the carrier film can be removed after the combination of substrate and transfer film and only after curing of the cold adhesive. It is not necessary that the liability of the transfer position is not yet or not completely cured cold adhesive is higher than the force required to detach a transfer layer region from the transfer layer and to overcome the adhesion to the carrier film. Only the adhesion of the transfer layer to the completely cured cold adhesive and furthermore to the substrate must be higher than the force required to detach a transfer layer region from the transfer layer and to overcome the adhesion to the carrier film when the carrier film is removed.
  • It is possible to use a single composition for the cold adhesive or to use a plurality of different cold adhesives side by side on the substrate which differ in terms of their chemical and / or physical properties. Often this requires the use of a separate printing unit per cold adhesive. A locally different adhesion of the transfer layer to the substrate can be achieved, so that any manipulative detachment attempts to change or exchange the substrate are made more difficult and the security against counterfeiting is increased.
  • It has proven useful if the cold adhesive, in particular the adhesive or UV adhesive crosslinking under UV irradiation, is applied to the substrate in an application amount in the range from 1 to 3 g / m 2 . Depending on the absorbency of the substrate used, the amount of cold adhesive to vary, with little absorbent and / or open pore-free substrates, especially with cold adhesive amounts in the range of 1 to 2 g / m 2 and more absorbent and / or open-pored substrates, especially with cold adhesive amounts be applied in the range of 2 to 3 g / m 2 .
  • In principle, all commercially available cold adhesives, in particular UV-crosslinking adhesives, so-called UV adhesives, are suitable for use in the process.
  • UV adhesives are used in particular in combination with a paper or film substrate.
  • It is particularly preferred if radiation having a wavelength in the range from 250 to 400 nm is used as the UV radiation for irradiating the adhesive crosslinking under UV irradiation, or the radiation used has a maximum in this wavelength range.
  • The substrate used is in particular paper, cardboard, plastic film, metal foil or a laminate comprising at least two of these materials.
  • The finished coated and, where appropriate, further processed and / or printed substrates are preferably used as wet labels, in-mold labels, magazines, packaging material, such as folding boxes.
  • The FIGS. 1 to 5 should exemplify a transfer film and different cold foil transfer process according to the invention. So shows:
  • FIG. 1
    a cross section through a transfer film;
    FIG. 2
    a cross-section through a substrate with a partially applied cold adhesive;
    FIG. 3
    schematically the flow of a cold foil transfer process in the side view;
    FIG. 4
    a schematic representation of a printing machine with a film transfer module in the side view; and
    FIG. 5
    the structure of the film transfer module according to FIG. 4 in detail.
  • FIG. 1 shows a cross section through a transfer film 40, which has a carrier film 42 and a detachable from the carrier film 42 transfer layer 41. The Transfer layer 41 comprises, starting from the carrier film 42 in this order, a transparent release layer 43, a transparent protective lacquer layer 44, a decorative layer 45 and a primer layer 46.
  • The carrier film 42 is a PET film with a thickness in the range of 7 to 23 microns. The thickness of the carrier film 42 is here in particular 12 microns.
  • The transparent release layer 43 is a wax and silicone-free layer. Here, a polymeric release layer of an acrylate copolymer, in particular with a surface tension in the range of 52.7 mN / m is used. The disperse fraction is 43.6 mN / m, the polar fraction 9.1 mN / m.
  • The transparent protective lacquer layer 44 is an optional layer, which serves in particular to protect the decorative layer 45 from mechanical and / or chemical stress. The protective lacquer layer 44 is in particular a lacquer layer based on nitrocellulose and acrylate polymers.
  • Here, the decorative layer 45 is a metallic layer of aluminum with a layer thickness in the range from 12 to 15 nm. Sputtering or vapor deposition are particularly suitable as coating methods for applying such metallic layers. Alternatively or in combination, color coat layers, luminescent layers, magnetic layers, thin-film stacks with viewing-angle-dependent interference color effect, liquid crystal layers, or even a combination of the abovementioned layers comprising the metallic layers can serve as decorative layer (s).
  • The primer layer 46 is formed of a thermoplastic adhesive and has a thickness in the range of 1 to 5 microns, in particular in the range of 1.5 to 3 microns, on. The primer layer 46 is here only a single layer. However, two or more primer layers may also be present in order to achieve optimal adhesion in the direction of the adjacent decorative layer (s) on the one side and optimal adhesion in the direction of the cold adhesive coming into contact with the transfer layer on the other side. The Primer layer 46 has a surface roughness of 137 μm (mean value) on its side facing away from the carrier film here.
  • FIG. 2 shows a cross section through a flexible substrate 51, on the pattern of a cold adhesive 11 is applied in the form of a crosslinking under UV irradiation adhesive. The flexible substrate 51 may in the simplest case be a paper web, a plastic film or a printed sheet. A plastic film is preferably made of polyester, polypropylene, polyethylene, polycarbonate, polystyrene, PVC or ABS having a film thickness in the range of 6 to 200 .mu.m, in particular from 19 to 38 microns. For paper sheets or webs, it has proven useful when these are painted, such as in a picture printing material or Chromolux.
  • Usually, the substrate 51 will have additional layers or applied film areas applied in previous process processes. Such further layers are, for example, ink layers, lacquer layers and / or metal layers, while applied film areas are characterized by transfer layer areas of e.g. Transfer films and labels can be formed. In this case, it is also possible for these further layers or applied film regions to be present only partially on the substrate 51 or, in total, to cover the substrate 51 superficially.
  • FIG. 3 shows a cold foil transfer unit comprising a printing station 10, an exposure station 20, three rollers 31, 32 and 33 and a deflection roller 34. The printing station 10 is preferably an offset or flexographic printing station. However, it is also possible that the printing station 10 is a gravure printing station.
  • The substrate 51 is fed continuously to the printing station 10 and partially printed with the cold adhesive 11 in the form of the adhesive which crosslinks under UV irradiation. Alternatively, it is also possible to print the transfer layer 41 of the transfer film 40 with the UV-crosslinking adhesive. The printing station 10 has a trough 9 in which the UV-curing adhesive is provided. By means of a plurality of transfer rollers 12, 13 of the UV-crosslinking adhesive is applied to a Pressure cylinder 14 applied. The printing cylinder 14 now prints the between the printing cylinder 14 and a counter-pressure cylinder 15 passing through flexible substrate 51 patterned with the cold adhesive 11, preferably in a thickness in the range of 0.5 to 10 microns.
  • The application amount of cold adhesive 11 to the substrate 51 is in particular in the range of 1 to 3 g / m 2 . The substrate 51 is transported here in particular from roll to roll.
  • The UV-crosslinking adhesive used has, in particular, the following viscosities, measured using the Rheometer MCR 101 meter from Physica (measuring cone: CP25-1 / Q1, measuring temperature: 20 ° C.).
    Viscosity at shear rate 25 1 / s:
    preferably 120 to 220 Pas, in particular 180 Pas
    Viscosity at shear rate 100 1 / s:
    preferably 40 to 90 Pas, especially 80 Pas
  • Furthermore, the UV-crosslinking adhesive used preferably has a tack value in the range from 18 to 25, in particular 22. The "tack" or the so-called initial adhesion is determined by means of the measuring instrument Inkomat 90T / 600 from the company Prüfbau. The following measurement conditions were chosen:
    • UV adhesive quantity: 1g
    • Roller speed: 100 m / min
    • Measuring temperature: 20 ° C
    • Measuring time: 2 min
  • The substrate 51 processed in this way by the printing station 10 is fed, as a substrate 52 partially printed with the UV-crosslinking adhesive, over the deflection roller 34 to the pair of rollers 31, 32, which applies the transfer film 40 continuously to the substrate 52 printed with UV adhesive. The roller 32 and the counterpressure roller 31 form a transfer nip in which, on the one hand, the substrate 52 coated with UV-crosslinking adhesive and, on the other hand, the transfer film 40 are drawn in. Depending on the type of cold adhesive 11 used, it is also possible in this case for the substrate 52 coated therewith to have a drying channel before it enters the transfer gap passes through, in which the cold adhesive 11, for example, dried at a temperature of 100 to 120 ° C and / or pre-cured.
  • The roller 32 of the roller pair 31, 32 is preferably covered on its circumference with a blanket or blanket 32 '. The blanket 32 'is usually constructed of a plurality of layers having different compressibility and elasticity. The individual layers are glued together over the entire surface or mechanically coupled to each other, in particular by a rail. In this case, the blanket 32 'in particular comprises a carrier layer of a textile fabric, with which the other existing layers are connected. The upper layer or cover layer of the blanket 32 ', which comes into contact with the transfer film in the cold-foil transfer unit, is preferably designed to be antistatic and detergent-resistant. The blanket 32 'is mounted on the roller 32, 32 between the roller 32 and blanket 32' for setting an optimal contact pressure of the roller 32 paper layers can be inserted, and arranged on both sides of the roller 32 not shown here Schmitzringe.
  • A bearer ring is part of the printing unit design of modern printing presses. Bearer rings on printing presses are arranged on the sides of the impression cylinders or rollers. The bearer rings are made of hardened steel with high rolling resistance and roll with high preload on each other. The task of the bearer rings is above all to prevent the torsional vibrations in the oscillatory, mechanically strained system of cylinders and gears. Furthermore, the bearer rings increase the bending stiffness of the cylinder pairing. This shifts the resonant frequency to non-critical areas and reduces flexing vibrations that excite the impact of rolling over channels in the rollers or cylinders. The grading of the bearer ring diameter - slightly smaller on the plate cylinder than on the blanket cylinder - enables the introduction of mechanical stresses in the direction of movement between the bearer rings and the gears. As a result, a clear flank position of the gears can be ensured even with strong torque laps in the channel rollover.
  • In a bearer ring plate and rubber cylinder based on the bearer rings at both ends of the cylinder from each other. The Schmitzring has the same diameter as the pitch circle of the driving gear. Usually, the blanket is underlaid so that it is compressed by the pressure plate by 1/10 mm, thereby to compensate for surface irregularities and build up the required surface pressure. It has proven to be beneficial to mount pressure plates 1/10 mm over Schmitzring and to place blankets at Schmitzringhöhe. The bearer rings also serve as a reference height in order to be able to measure the elevator heights on the cylinders. However, the bearer rings primarily ensure smooth cylinder running due to the pretensioning applied during assembly and the avoidance of quality-reducing and noise-producing effects of load fluctuations as a result of channel overrun. Bearing force fluctuations can produce quality-reducing stripes in homogeneous, larger screen areas by minimally varying dot gain.
  • When cold foil transfer is usually "worked on Schmitz" in order to apply a sufficient pressure, although it is also possible to work a few hundredths of a millimeter "under Schmitz". Over the selected circumference of the blanket 32 ', the speed of the transfer film and the transfer ribbon tension can be influenced to a small extent.
  • In the FIG. 3 shown transfer film 40 is withdrawn from a supply roll not shown separately and on the side of the transfer layer 41 (see Fig. 1 ) are brought into contact with the substrate 52 printed with UV-crosslinking adhesive. This results in a composite 53 of the printed with UV-crosslinking adhesive substrate 52 and the transfer film 40th
  • The carrier film 42 can be removed from the composite 53 before or after the curing of the cold adhesive 11, depending on the level of adhesion of the transfer layer 41 on the uncured or cured cold adhesive 11 in comparison to the force required to detach / detach the transfer layer 41 from / from the carrier film 42.
  • According to FIG. 3 the composite 53 is supplied by way of example to an exposure station 20 and exposed to UV radiation. The exposure station 20 has a UV lamp 21 and a reflector 22 which bundles the UV radiation radiated from the UV lamp 21 onto the composite 53. The power of the UV lamp 21 is in this case selected so that the cold adhesive 11 is irradiated when passing through the exposure station 20 with a sufficient amount of energy that ensures a secure curing of the UV-curing adhesive 11.
  • The composite 53 is in this case irradiated from the side of the transfer film 40. This is only possible if the transfer film 40 is sufficiently UV-transmissive. If the substrate 51 is designed to be transparent or semi-transparent for the UV radiation required for curing the UV-crosslinking adhesive 11, the composite 53 can alternatively or additionally also be irradiated from the side of the substrate 51. If the carrier film 42 is already removed from the transfer layer 41 before the exposure, it is sufficient for only the transfer layer to be UV-transparent in order to be able to cure the UV adhesive.
  • As a result of the curing of the pattern-shaped UV-crosslinking adhesive 11, the transfer layer 41 of the transfer film 40 is adhesively bonded to the substrate 51 at the locations where the UV-crosslinking adhesive 11 is present. Subsequently, the exposed composite 54 is fed to the roller 33, where the carrier foil 42 is peeled off the exposed composite 54. If the carrier film 42 is peeled off from the irradiated composite 54, then the transfer layer 41 adheres to the substrate 51 in the regions in which the cold adhesive 11s which has now hardened is present, and is thus removed from the transfer film 40 at these points. In the other places, the adhesion between carrier film 42 and transfer layer 41 predominates, so that here the transfer layer 41 remains on the carrier film 42.
  • The fixed to the substrate 51 areas of the transfer film 41 have due to the cured cold adhesive 11s a tesa-firm adhesion (Tesatest see above) on the substrate 51st
  • If a conventional or pressure-curing adhesive is used as the cold adhesive in the cold-film transfer process, of course, no exposure station 20 is used to cure the cold adhesive, as in US Pat FIG. 3 shown, required.
  • After the removal of the used transfer film 40 ', the substrate 55 partially coated with transfer layer 41 remains, which can now be fed to further printing or film application units and to punching or cutting units.
  • In particular, the substrate 55, which is partially coated with transfer layer 41, is at least partially printed with conventional printing inks, in particular UV-curing printing inks, UV-curing lacquers, hybrid paints or lacquers.
  • FIG. 4 now shows a schematic representation of a printing machine with a film transfer module for the cold foil transfer, wherein a single sheet-processing printing machine is shown, which consists of at least two printing units. The two printing units are used for the following purposes:
    A sheet to be coated is provided in a first step with a pattern of cold glue. The cold glue is applied in a device configured as a printing station 100, e.g. B. a conventional printing unit of an offset printing press on there existing inking and dampening 110, a printing plate on a plate cylinder 120, a covered with a blanket cylinder 130 and an impression cylinder 400 '. Likewise, printing units in the form of flexographic printing units or coating units can be used here.
  • Thereafter, together with a printing sheet, a transfer film 40 is passed through a transfer nip 60, wherein the transfer film 40 is pressed in the transfer nip 60 against the printing sheet. For this purpose, a film transfer module 200 is used which can correspond to a printing unit or a coating module or a base unit or another type of processing station of a sheetfed offset printing press. The transfer nip 60 in the film transfer module 200 is formed by a roller 300 and a counterpressure roller 400. In this case, the roller 300 can correspond to a blanket cylinder and the counterpressure roller 400 to an impression cylinder of a known offset printing unit. Furthermore, the roller 300 can correspond to a forme cylinder and the counterpressure roller 400 can correspond to an impression cylinder of a paint module of a sheet-fed printing press.
  • Furthermore, the film transfer module 200 downstream of a so-called calendering be provided if the coated sheet to increase the adhesion of the coating or to increase the smoothness and gloss of the sheet is to be rolled under increased pressure.
  • Within the film transfer module 200 used for the film transfer, a web guide for transfer films 40 is shown. The sheet supply roll 80 is associated with the sheet transfer module 200 on the page of the sheet feeder. The film supply roll 80 has a rotary drive 70. The rotary drive 70 is required for the continuous controlled feeding of the transfer film 40 to the film transfer module 200 and is therefore controllable.
  • Furthermore, in the area of the film feed and film removal guide devices 140 (see FIG. 5 ), such as deflection or tensioning rollers, pneumatically actuated conducting means and baffles provided. In this way, the transfer film 40 can be smoothly guided without distortions and held in constant tension with respect to the roller 300. The guide devices 140 may also include means for introducing the transfer film 40. In this case, automatic feeding aids for the transfer film 40 can be used.
  • In this case, the transfer film 40 can be guided around the roller 300, wherein the transfer film 40 can advantageously be fed in and out of the transfer nip 60 only from one side of the film transfer module 200 (see dashed representation). The transfer film 40 may differ from the illustration to Fig. 4 and depending on the space conditions on one side of the film transfer module 200 are advantageously performed in the feeding strand and the laxative strand closely parallel to each other.
  • In a further embodiment, the transfer film 40 can also be fed in and out tangentially on the roller 300 substantially tangentially or around the transfer gap 60 only in a small circumferential angle. For this purpose, the transfer film 40 is supplied from one side of the film transfer module 200 and discharged to the opposite side of the film transfer module 200.
  • On the outlet side of the printing unit, a film collecting roll 90 is shown. On the film collecting roll 90, the used transfer film material is rewound. Again, a rotary drive 70 is provided, which is controllable. In essence, the transfer film 40 could also be moved by the rotary drive 70 on the outlet side and kept taut on the inlet side by means of a brake.
  • For the transfer process of the transfer layer 41 of the transfer film 40 to a printing sheet in the transfer nip 60 between the roller 300 and the counter-pressure roller 400, it is essential that the surface of the roller 300, so the blanket cylinder or forme cylinder, is equipped with a compressible, damping element.
  • The roller 300 is therefore provided with a covering 320 or with a corresponding coating. The covering 320 or the coating can be embodied, for example, as a plastic coating, for example in the form of a blanket or blanket. A string 320 is held on the roller 300 in a cylinder channel on jigs.
  • The cover 320 may be equipped to improve the transmission properties in the transfer nip 60 with a targeted elasticity. This may optionally act in a compressible intermediate layer. This compressibility is preferably similar or less than in conventional blankets commonly used at this point. The mentioned compressibility can be produced by means of a conventional compressible printing blanket. Furthermore, combined fabrics made of a hard blanket and a soft pad can be used.
  • To improve the efficiency of the cold foil transfer process, it is provided that the film advance of the transfer film 40 from the film supply roll 80 to the transfer nip 60 and the film collection roll 90 is controllable such that the transfer film 40 is stopped as possible, if no transfer of the transfer layer 41 should take place. For this purpose, a control of the transfer film 40 in such a way take place that when passing through grippers of the receiving cylinder channel of the sheet-guiding counter-pressure roller 400, the film feed is stopped. The grippers hold a printed sheet on the counter-pressure roller 400. The roller 300 has a cylinder channel corresponding thereto, in which the clothing 320 is held. In the region of the corresponding cylinder channels, there is no pressing of the transfer film 40 between the roller 300 (blanket cylinder) and the counterpressure roller 400. The roller 300 then slides on the transfer film 40 while the transfer film 40 between the roller 300 and the counterpressure roller 400 is tensioned freely is. This state continues until at the so-called pressure beginning of the cylinder channel ends and the transfer sheet 40 is again clamped between the roller 300 and the platen roller 400 including a sheet.
  • Then, the transfer film 40 is further transported. The timing of the transfer film advance can start or suspend a little earlier, according to a necessary acceleration or braking of the film supply roll 80 or film collection roll 90, than predetermine the channel edges of the cylinder channel. In response-fast timing systems via so-called dancer rollers 180, as exemplified in FIG. 5 are shown, the control of the rotary actuators 70 of the film supply rolls 80 and film collecting roll 90 may not be necessary. By means of the dancer rollers 180, the necessary transfer ribbon tension is also maintained.
  • A further improvement of the transfer film utilization results from the fact that the transfer film 40 is divided into one or more sub-film webs of lesser width. Thus, with appropriate control by means of the device or devices for timing the film feed each of the sub-film webs, the utilization of the transfer film 40 can be improved even with zonally different lengths coating areas within a sheet.
  • For this purpose, each partial film web is conveyed only exactly in the area in which the transfer layer 41 is to be applied. In the areas not to be coated, each partial film web can be shut down independently of the other partial film webs, so that no unnecessary film consumption arises.
  • Furthermore, in order to improve the cold foil transfer process, provision is made for drying 160 in the area of the cold adhesive application and in the area of the film application. In this way, in particular by means of UV drying, the pattern-applied cold adhesive, in particular UV adhesive, can be pre-dried by means of a first dryer 160, so that the transfer layer 41 better adheres to the transfer film 40 and the carrier film 42 (see FIG. 1 ) can be removed already before curing of the cold adhesive.
  • The adhesion of the impressed transfer layer 41 on a printed sheet can be improved in succession by means of a second dryer 160 by additionally accelerating the drying and curing of the cold adhesive.
  • The quality of the coating of a printed sheet with transfer layer is controlled by means of an inspection or monitoring device 170 after the film application. For this purpose, the inspection device 170 is directed onto a sheet-guiding surface of the film transfer module 200 after the transfer nip 60 and possibly sealed off from the dryer 160 or onto a sheet-guiding surface of a further sheet-guiding module downstream of the film transfer module 200. The coated sheet passing there can thus be checked for completeness and quality of the coating. As poorly recognized printed sheets can be marked or rejected in a sorter as waste.
  • According to FIG. 5 For example, the film transfer module 200 can be provided with means for conditioning the transfer film 40 in order to improve the layer transfer and the coating result. In this case, the transfer film 40 can be influenced by means of the film guide device 140.
  • To improve the adhesion and gloss effect, the transfer layer 41 is applied in particular by means of a UV adhesive to a printed sheet. For this purpose, a UV dryer after the printing station 100 for predrying the cold adhesive application and / or after transfer of the transfer layer 41 in the film transfer module 200, a transfer layer 41 penetrating UV dryer, for example, to the platen 400 of the film transfer plant 200 to arrange.
  • To increase the quality of the printed product, it is possible by means of the device described to carry out processes for applying reliefs or embossings, holograms or prefabricated image motifs, which may likewise have surface structures, on the printed sheet.
  • Embossments or reliefs are advantageously applied to the already coated surface. This can be done, for example, in one, the film transfer module 200 downstream embossing. In this case, the printed sheet is guided, for example, over a profiled surface and under pressure against a soft counter surface. Conversely, the embossing from the top, i. the coated side of the sheet, to be performed against an elastic pad. The required device can be arranged in a printing unit or a film transfer module. There, the embossing or relief shape is arranged on a blanket or form cylinder or on the counter-pressure roller 400. The soft or elastic mating surface is arranged corresponding to the respective other cylinder of the printing unit or coating module. By means of such an embossing device, the transfer layer 41 can also be used for the transmission of special picture elements.
  • Depending on the type of printing press used, the following machine parameters are selected in particular when merging the printed sheet and the transfer film, with the standard values specified by the respective machine manufacturer being indicated for comparison in square brackets at the end of the line:
  • Manroland 700 printing machine from manroland
  • Contact pressure: in the range of -0.1 to 0.1; in particular 0.05 [0] Blanket (over Schmitz): in the range of 0 to 0.3; in particular 0.2 [0,1] Transfer film handling: in the range of 20 to 50%; in particular 30% [50%] Transfer ribbon take-up: in the range of 20 to 50%; in particular 30% [50%]
  • Printing machine type XL105 or CD 102 or CD 74 from Heidelberger
  • Contact pressure: in the range of -0.1 to 0.1; in particular 0.1 [0,3] Blanket (over Schmitz): in the range of 0 to 0.3; in particular 0.2 [0] Transfer film handling: in the range of 0.2 to 1.5; especially 1.0 [1,5] Transfer ribbon take-up: in the range of 0.2 to 1.5; especially 1.0 [1,5]
  • Printing press type König & Bauer
  • Contact pressure: in the range of 0 to 0.3; in particular 0.2 [0,2] Blanket (over Schmitz): in the range of 0 to 0.2; in particular 0.05 [0] Transfer sheet unwinding: in the range of 1.5 to 4 x 10 5 kg / (m · s 2 ) (bar); in particular from 2.5 · 10 5 kg / (m · s 2) (bar) [4,0] Transfer ribbon take-up: in the range of 1.5 to 4 x 10 5 kg / (m · s 2 ) (bar); in particular 2.5 × 10 5 kg / (m · s 2 ) (bar) [3,9]
  • In all machine types, it is preferred if in the printing unit 100 the permanent dampening is set to "off" for application of a cold adhesive, in particular of a UV-crosslinking adhesive to a printed sheet. This means for example with regard to FIG. 4 in that the blanket on the printing cylinder 130, which transfers cold glue to a sheet, is moistened with water at the locations where there is no cold glue only when printing. Thus, a water absorption of the cold adhesive, which leads to an emulsification of water and adhesive and further loss of the adhesive properties of the cold adhesive, reliably avoid.
  • On a transfer layer 41, which by means of a transfer film of the method by means of a device according to FIG. 3 on a substrate or a printing press according to the FIGS. 4 or 5 was fixed on a sheet by means of UV adhesive, the following parameters were determined for the abrasion:
  • Test 1
  • Test equipment: Sutherland ink-rub tester (company: Danilee Corporation)
    Test method: ASTM D5264
    Abrasion Sutherland: 600 cycles
  • Test 2
  • Test equipment: Atlas AATC M 238BB Crockmeter
    Test method: ISO 105X12 / D02
    Abrasion Crockmeter: 40 cycles
  • The abrasion was thus negligible and the adhesion of the transfer layer to the substrate / printing sheet was good.

Claims (11)

  1. Cold film transfer method, in which a cold adhesive (11), in particular an adhesive that crosslinks under UV radiation, is applied to a substrate (51) and is connected to a transfer ply (41) of a transfer film (40), wherein a transfer film (40) is guided together with the substrate (51), said transfer film (40) comprising a carrier film (42) and a transfer ply (41) that can be detached from the carrier film (42), wherein, starting from the carrier film (42), the transfer ply (41) has a transparent polymer detachment layer (43), an optional transparent protective lacquer layer (44), at least one decorative layer (45) and at least one primer layer (46), and wherein, in a temperature range from 15 to 35°C, the detaching force of the transfer ply (41) from the carrier film (42) ranges from 15 to 35 cN/cm, in particular ranges from 20 to 30 cN/cm, wherein, when guiding the transfer film (40) together with the substrate (51), the at least one primer layer (46) of the transfer film (40) shows to the cold adhesive (11), and wherein, furthermore, the cold adhesive (11) is cured, in particular the adhesive that crosslinks under UV radiation is irradiated and crosslinked, wherein an adhesive connection to the transfer ply (41) of the transfer film (40) is formed.
  2. Cold film transfer method according to claim 1, in which the at least one primer layer (46) in the transfer film (40) that is guided together with the substrate (51) is formed from a thermoplastic adhesive, which can be activated in a temperature range of >90°C.
  3. Cold film transfer method according to one of the preceding claims,
    characterised in that
    the cold adhesive (11), in particular the adhesive that crosslinks under UV radiation, is applied to the substrate (51) in an application amount ranging from 1 to 3 g/m2.
  4. Transfer film (40), set up for use in a cold film transfer method according to one of the preceding claims and, to do so, comprising a carrier film (42) and a transfer ply (41) that can be detached from the carrier film (42),
    wherein, starting from the carrier film (42), the transfer ply (41) comprises a transparent polymer detachment layer (43), an optional transparent protective lacquer layer (44), at least one decorative layer (45) and at least one primer layer (46), and wherein, in a temperate range of 15 to 35°C, the detaching force of the transfer ply (41) from the carrier film (42) ranges from 15 to 35 cN/cm, in particular ranges from 20 to 30 cN/cm.
  5. Transfer film according to claim 4,
    characterised in that,
    in a temperature range of 15 to 35°C, the detaching force of the detachment layer (43) from the optional protective lacquer layer (44) or the decorative layer (45) is greater, in particular 1.5 times greater, than the detaching force of the detachment layer (43) from the carrier film.
  6. Transfer film according to claim 4 or 5,
    characterised in that
    the at least one priming layer (46) is formed from a thermoplastic adhesive which can be activated in a temperature range of >90°C.
  7. Transfer film according to one of claims 4 to 6,
    characterised in that
    the detachment layer (43) is formed on the basis of an acrylate copolymer.
  8. Transfer film according to one of claims 4 to 7,
    characterised in that,
    for UV radiation in the wavelength range of 250 nm to 400 nm, the transfer film (40) has a transparency ranging from 5 to 70%, in particularly ranging from 10 to 40%.
  9. Transfer film according to one of claims 4 to 8,
    characterised in that
    the detachment layer (43) has a thickness ranging from 0.01 to 0.5 µm, in particular ranging from 0.1 to 0.2 µm.
  10. Transfer film according to one of claims 4 to 9,
    characterised in that
    the at least one decorative layer (45) is formed by a metallic layer or a dielectric layer.
  11. Transfer film according to claim 10,
    characterised in that
    the metallic layer has a layer thickness ranging from 8 to 15 nm, in particular ranging from 10 to 12 nm.
EP09011629.4A 2008-09-12 2009-09-11 Transfer film and cold film transfer method Active EP2172347B1 (en)

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TR201900866T4 (en) 2019-02-21
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EP2172347A2 (en) 2010-04-07
EP2172347A3 (en) 2012-07-11
EP3441234A1 (en) 2019-02-13

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