WO2023078980A1

WO2023078980A1 - Identification of silicone defects during running coating operation

Info

Publication number: WO2023078980A1
Application number: PCT/EP2022/080643
Authority: WO
Inventors: Siegfried Schmitzer; Sahin SAYGILI; Werner Schmidt; Harald GERLACHER
Original assignee: Loparex Germany Gmbh & Co. Kg
Priority date: 2021-11-04
Filing date: 2022-11-03
Publication date: 2023-05-11

Abstract

The invention relates to a method for producing a carrier film coated with a silicone composition. The method allows the identification of production defects during the running coating operation. To this end, a silicone composition is applied to a surface side of the carrier film and comprises an auxiliary substance that is detectable by optical means, whereby a release coating is obtained which contains the auxiliary substance. An optical property of the release coating is then determined in order to identify production faults in the release coating, the optical property being dependent on the auxiliary substance. The film can then be printed on the opposite surface side.

Description

Detection of silicone defects during ongoing coating operation

The priority of German patent application no. 10 2021 212 423.2 of November 4, 2021 is claimed.

The invention relates to a method for producing a carrier film coated with a silicone composition. The process enables production errors to be identified during ongoing coating operations. For this purpose, a silicone composition which comprises an auxiliary which can be detected by optical means is applied to one surface side of the carrier film, as a result of which a release coating which contains the auxiliary is obtained. An optical property of the release coating is then determined in order to detect production errors in the release coating, the optical property being dependent on the auxiliary. The film can then be printed on the opposite side of the surface.

Release films are often used as removable protective films for adhesive tapes, self-adhesive labels or adhesive sanitary and hygiene articles in order to prevent these products, which are adhesive on one or both sides, from sticking together during storage or processing. To this end, release films must be characterized by a good release effect against adhesives such as pressure-sensitive adhesives, hot-melt adhesives or other adhesive materials. In order to ensure these properties, release films often have a release coating on a carrier film, which can be based on a silicone composition, for example.

In addition, it is often desirable to print the release liners for informational, aesthetic, manufacturing, or other reasons. For example, colored tactile, control and/or pressure marks, i.e. colored markings, can be printed at certain intervals on the carrier side next to or under the release coating of the release liner. This colored tactile, control and / or pressure marks then allow in the manufacture or packaging of products such. B. sanitary or hygiene products, in a device provided for this purpose, an exact placement of the release films and the products to each other by optical methods.

Silicone compositions containing colorants are known in the art. US 4,737,537 relates to colored silicone compositions, which can be oils, fats, pastes, resins, emulsions and rubbers, and masterbatches therefor.

[0007] US Pat. No. 5,182,353 relates to a method for covalently bonding an analyte-sensitive dye compound to an addition-crosslinking silicone.

US 5,789,515 relates to a colorant having a siloxane-containing poly(oxyalkylene) copolymer substituent and more particularly to a colorant made from a reactive dye.

Colored release films and packaging materials which are equipped with colored release coatings (release layers) based on silicone compositions are also known from the prior art.

According to US 2004/0137242, cationic radiation curable inks do not ghost when coated with solvent, solventless, and radiation curable silicone release coatings. When aggressive solvent-based adhesives are poured over ink applied to a substrate and stripped off after drying, no ghosting is observed.

WO 03/030796 relates to a single wrapping sheet for a disposable sanitary napkin comprising a nonwoven composite film consisting of a nonwoven fabric having a basis weight of 4 to 25 g/m ² and a polymeric film having a basis weight of 2 to 20 g/m ² , and a silicone release layer formed on the nonwoven composite film by applying a thermosetting colored silicone coating agent to the nonwoven composite film and thermosetting such a coating agent. The silicone coating release liner contains organopolysiloxane and is partially formed on the nonwoven composite such that the release liner covers a hot melt of the sanitary napkin within a single package area of the sanitary napkin.

EP 2 623 077 relates to an individually wrapped product in which it is difficult to identify the individually wrapped product as an absorbent article from the outside, color does not easily transfer to other individually wrapped products, and the product is placed in a bag , bag, etc. can be brought in and easily transported.

WO 2011/103149 relates to release liner materials for use as packaging material for individually packaged disposable absorbent articles, typically sanitary napkins and the like, and release compositions for use in the release liner materials. JP 2000 175964 relates to a plastic film which is produced by adding a colorant to a thermoplastic resin and which is used as a base material in a unit pack material of a sanitary napkin. As the colorant, an inorganic pigment or an organic pigment or the like which is a component for optionally coloring the plastic film A is usually used.

Methods for detecting production defects in films are also known from the prior art.

US 2020/0104993 provides a film defect detection system. The film defect detection system may include an image capturing unit configured to capture an image of a film in a manufacturing process of the film; a defect detection unit configured to detect defects in the film by analyzing the captured image of the film using a machine learning algorithm that has learned to detect a defect in advance when receiving the captured image of the film; and an information output unit configured to output information about the defects in the film detected by the defect detection unit.

[0017] TW 97140979 A relates to an optical thin film inspection device suitable for inspecting a thin film sample, the optical thin film inspection device comprising at least one light source with multiple wavelengths, a dispersion collimation module, a multi-channel polarization rotation module, a multi-channel phase delay module, a convergence collimation module, a polarization module and an imaging spectrograph.

CN 210322756 U relates to an auxiliary device for detecting defects in the surface of thin films.

R.-K. Sheu et al., Appl. May be. 2020, 10, 1206; doi: 10.3390/app 10041206 relates to a device and a method for detecting defects in polymer films.

N. Taherimakhsousi et al., npj Computational Materials (2020) 111, https://doi.org/10.1038/s41524-020-00380-w relates to the quantification of defects in thin films by machine vision ").

However, the known methods from the prior art for producing release films, which are based on carrier films with a release coating, the release films produced in this way and the silicone compositions used for them are not satisfactory in every respect and there is a need for improved processes, improved release liners, and improved silicone compositions. According to the prior art, difficulties arise in particular when the carrier films are embossed and the release coating has a comparatively low application weight.

Release films provided with a silicone-based release coating can usually have a full-area ("siliconized wrap film" (SWF)) or a partial area ("siliconized single wrap film" (SSWF)) coating. The release coating is typically on the front of the release film, while the back can have another, e.g. decorative, print. Such separating films are, for example, further processed into packaging or bags for feminine hygiene articles, for example, whereby folding and sealing processes are used on the one hand and the coated surfaces are used to cover adhesive closure surfaces on the other.

Printing methods, for example flexographic printing methods, are usually used to coat the carrier films with the release coating. Various production defects of the release coating can occur during the coating process.

[0024] For example, problems with an applicator during printing can lead to large format or no release coating at all. Furthermore, damaged areas of the release coating can be caused by folds or specks in the carrier film or in parts of the carrier film on the sleeve or plate. Line-shaped dropouts within the release coating are also possible if the sleeve has been damaged, e.g. by knife cuts or similar tools. Such production defects of the release coating can be particularly problematic, in which case the release coating is missing over the entire surface over several meters on the film.

Another form of possible production errors are deviating application weights, ie areas of the release coating with an application weight that is too high or too low. Furthermore, there may be different contact pressures of the sleeves and/or clichés, which can result in different application weights across the film width. In the case of embossed release films, it can also happen that the depressions of the embossing are sufficiently covered with the release coating, but this is not the case with the embossing peaks (elevations).

[0026] Further production errors of the release coating can occur in the form of incomplete curing of the release coating. A release coating that is not cured or not fully cured can lead to an undesirable transfer of uncured silicone to the back of the film. If such production defects in the release coating are not detected, further processing of the release films, for example to form packaging products, can result in the machines coming to a standstill and/or the end products not being functional. The separating property of such separating films is not available to the desired extent and any packaging made from them may not open at all, only with difficulty or only with corresponding noise.

With certain release films, it is also possible to identify possible production errors in the release coating during the coating operation. In the case of polyester-based release films with a smooth surface and silicone-based release coating, production errors can be detected, for example, due to the different gloss of the coated areas compared to areas that are not and/or incorrectly coated.

[0029] Such detection of production defects in the release coating is only possible to a limited extent in the case of comparatively thin embossed release films which are based on polyolefin. In the case of such release films, the differences in gloss and/or brightness (contrast) between coated and uncoated or incorrectly coated areas are significantly weaker. It is therefore not possible, or only unreliable, to determine production defects in the silicone-based release coating during the coating operation. In addition, the detection of production defects in the release coating of such release films is made more difficult by a comparatively low application weight of the release coating.

[0030] This problem could be counteracted, for example, by increasing the application weight of the release coating to, for example, more than 1.0 g/m ² . This would increase the gloss of the release coating and it would also be possible to detect production defects in the release coating, even with thin, embossed release films. However, such high application weights of the release coating are usually not desirable since the production costs would increase significantly as a result.

DE 10 2009 050 659 A1 relates to a method which comprises stimulating a vehicle component to luminescence and using an adhesive for the vehicle component, the adhesive containing a luminescent dye. Surface contamination with the adhesive is considered a surface defect.

WO 2018 011465 A1 relates to a measuring method, a measuring arrangement and a measuring device. A silicone-coated layer (1) is illuminated with a light source (2). By using a imaging measuring device (4), an image of the silicone-coated layer (1) is generated. The silicone coverage of the silicone coating is analyzed from the image observed image.

There is therefore a need for silicone compositions, release films and processes for their production, which have advantages over the prior art or overcome the disadvantages mentioned above.

The object of the invention is to provide advantageous silicone compositions, advantageous release films and an advantageous method for producing such release films. The method should enable the production of preferably embossed release films, which have a comparatively thin release coating, while at the same time detecting possible production errors in the release coating of such release films.

[0035] This object is solved by the subject matter of the patent claims.

[0036] It was surprisingly found that by adding an optically detectable auxiliary, eg a colorant, to the silicone composition, production errors in the release coating can be detected automatically during ongoing coating operation, even at about 350 m/min. This enables countermeasures to be taken in good time or production errors to be identified so that the relevant parts of the release film can then be removed, for example when the release film is cut. In particular, it was surprisingly found that even with preferably embossed polyolefin-based release films with a comparatively low application weight, eg less than 1.0 g/m ² , a silicone-based release coating can detect production defects in the release coating during the coating operation.

It was also surprisingly found that suitable auxiliaries are, for example, organic or inorganic colorants which selectively absorb and/or scatter light in the visible wavelength range. Such colorants can be, for example, dyes or pigments, which can be added in a matrix compatible with the silicone composition. Surprisingly, it was found that particulate auxiliaries, such as pigments, are particularly suitable for detecting production errors in the release coating. These do not agglomerate when added to the silicone composition, and migration of the particles with the resultant ghost dust is also not observed. In addition, it was surprisingly found that even comparatively small amounts of such auxiliaries, for example less than 1.0% by weight, based on the total weight of the silicone composition, are sufficient to enable production errors in the release coating to be detected.

In addition, it was surprisingly found that the detection of production errors in the release coating when using corresponding silicone compositions comprising an auxiliary is possible via differences in optical properties between different areas of the release film, such as gloss, brightness and/or contrast. The production errors can be detected, for example, by recording measured values of the optical properties and using the discernible differences in the optical properties between coated and uncoated or defectively coated areas of the release coating. It has been found that these differences, in particular the recording of measured values of the optical properties, can be recorded using an optical measuring device, e.g. a camera system. It is advantageous if these differences are detected directly after the coating and before any further prints are applied to the opposite rear side. In this way, possible disruptive effects due to the prints on the back showing through (contact) transparent release films can be avoided.

In addition, it was surprisingly found that the differences in optical properties such as gloss, brightness and / or contrast between coated and non-coated or defectively coated areas of the release coating can be increased by lighting (e.g. with oblique light), which makes it possible to detect production errors Release coating is improved.

It was also surprisingly found that when using coloring auxiliaries such as dyes and/or pigments, it is already sufficient for reliable detection of production errors in the release coating to color the release coating so lightly that the coloring is not disturbing when viewing the release film noticeable, but color-intensive enough for detection. In this case, the differences in gloss and less in brightness can be relevant for detection.

It has also been found that the color of the front release coating can be matched to the color of a back translucent print. For example, the color of the print on the back can correspond to the color of the release coating, so that the colored release coating is not uncomfortably noticeable when looking at the release film. It is also possible to achieve special decorative and/or marketing-relevant effects by using different colors for the print and the release coating. It has been found that the use of several printing units for applying, for example, silicone compositions of different colors Allows color schemes of the release coating. In this way, special optical effects can be created, for example in combination with a print on the back.

In addition, it was surprisingly found that pigment mixtures and effect pigments such as, for example, flat, metallic metal effect pigments; refractive, transparent pearlescent pigments or interference pigments, are suitable as auxiliaries to enable detection of production defects in the release coating. At the same time, targeted optical effects can be generated.

In addition, it was surprisingly found that the properties of the release coating, such as release values, extraction values, reductions in adhesive force, anchoring resistances, coefficients of friction, refractive index, thermal conductivity, electrical conductivity and/or magnetic properties are not impaired by the addition of the auxiliary and are even improved in some cases. For example, the extract values can be lowered, the reduction in adhesive strength reduced and the release values increased or decreased as required.

In particular, it was surprisingly found that a connection can be made between the curing state of the silicone composition and the optical properties of the release coating, such as, for example, using the color intensity and/or color brightness. The orientation of the preferably particulate auxiliary, e.g. a pigment, may depend on whether the silicone composition is in the uncured (e.g. liquid) or in the cured (e.g. solid) state. The resulting optical differences, such as differences in reflection, can be used, for example, to identify release coatings that are not cured or not completely cured. In addition, it was surprisingly found that the addition of the preferably particulate excipient can accelerate the curing of the silicone composition, thereby additionally avoiding a release coating that is not cured or not completely cured.

In addition, it was surprisingly found that the application weights of the release coating can also be checked by comparing the measured values determined for the optical properties of the release coating with a reference value, which was determined beforehand, e.g. by means of X-ray fluorescence (XRF). This ensures a uniform coating of the separating films.

It was also surprisingly found that it is possible to use various silicone compositions which, for example, can be free-radically, cationically and/or thermally curable.

A first aspect of the invention relates to a method for producing a release film and/or for detecting production defects in a release film, comprising the steps: (a) providing a carrier film which comprises a first surface side and an opposite second surface side, the first surface side comprising an area which is intended for the application of a release coating;

(b) providing a silicone composition comprising an auxiliary which can be detected by optical means; wherein the silicone composition is preferably curable and/or contains a solvent;

(c) applying the silicone composition to the area to form an area with a release coating;

(d) optionally curing the silicone composition applied in step (c) to obtain an area with a cured release coating;

(e) determining at least one optical property of the release coating at locations within the area to detect manufacturing defects in the release coating; wherein preferably the at least one optical property of the release coating is dependent on the adjuvant;

(f) optionally marking of production defects identified in step (e);

(g) optionally printing at least one printing area (8) of the opposite second surface side; and

(h) possibly sorting out sections of the separating film which have production errors which were possibly marked in step (f).

Steps (d), (f), (g) and (h) of the method according to the invention are independently optional.

The separating film preferably has a total layer thickness in the range from 10 to 25 μm; and/or is micro-embossed and has a total embossed layer thickness in the range from 30 to 60 μm. The release coating preferably has an application weight of at most 1.0 g/m ² ; preferably at most 0.6 g/m ² , more preferably at most 0.5 g/m ² .

Unless expressly stated otherwise, percentages are percentages by weight. Unless expressly stated otherwise, standards such as EN ISO or FINAT in the version valid on January 1, 2021 are decisive.

The method according to the invention is aimed at the production of a release film. Release films (release liners) are known to a person skilled in the art. Release films for the purposes of the invention are preferably plastic-based films, particularly preferably polyolefin-based films, which are used to prevent a sticky surface from adhering prematurely. Release films can be on one or be coated on both sides with a release agent which has a release effect against sticky materials such as glue or putty. The release films according to the invention are preferably used for packaging and as a component of hygiene products, as release and surface films for applications in the construction industry and as a release film for technical adhesive tapes and special labels.

In step (a) of the method according to the invention, a carrier film is provided. The carrier film according to the invention preferably comprises polyester, polyamide or polyolefin such as polyethylene or polypropylene, optionally with different surface treatments. The carrier film can be stretched monoaxially or biaxially. The carrier films according to the invention can serve various functions, which are preferably selected from the group consisting of oxygen barrier, aroma barrier, light protection, rigidity, puncture resistance, print carrier, etc.

The release film according to the invention comprises a release coating. The release coating preferably serves to separate the release film from a sticky material, the carrier film being the carrier for the release coating. Frequently used release agents for release coatings can be crosslinkable silicone, oils, fats, certain polyolefins or fluorocarbons.

In step (b) of the method according to the invention, a silicone composition is provided. The silicone composition comprises an optically detectable auxiliary and a solvent and/or is curable. The silicone composition preferably serves to uniformly apply a release coating of controlled thickness to the carrier film. The release coating can cover the entire surface and completely cover the carrier film, or only part of the surface and partially cover the carrier film. Techniques preferably used according to the invention for coating, i.e. for applying the silicone composition with which the release coating is preferably formed after evaporation of the solvent, are printing processes. All weights and percentages are based on the total weight of the silicone composition unless expressly stated otherwise.

The silicone composition according to the invention comprises an auxiliary which can be detected by optical means, i.e. an auxiliary which can be detected by optical devices due to its interaction with light.

In step (e) of the method according to the invention, at least one optical property of the release coating is determined. Typically, the optical properties of a material are determined by the nature of its interactions with incident light, such as diffraction, refraction, scattering, or reflection of the incident light. In step (e) of the method according to the invention, production defects in the release coating are detected by the at least one optical property determined. Production errors according to the invention are points and/or areas of the release film at which the release coating is not applied to the carrier film and/or cured in the intended manner.

Steps (a) to (h) if appropriate are preferably carried out in alphabetical order, although other orders are also possible. For example, the order of steps (a) and (b) is immaterial. In a preferred embodiment, all steps take place one after the other. In another preferred embodiment, steps (e) and (f) occur simultaneously. In a preferred embodiment, step (d) occurs entirely before step (e). In a preferred embodiment, step (e) takes place after step (c) and optionally step (d), but before step (g). In a preferred embodiment, step (g) occurs before step (h). In another preferred embodiment, step (h) occurs before step (g).

The process is preferably carried out continuously.

The release film according to the invention, which is produced using the method according to the invention, preferably has a total layer thickness of

- at least 5.0 pm on; preferably at least 6.0 pm, more preferably at least 7.0 pm, even more preferably at least 8.0 pm, most preferably at least 9.0 pm, and especially at least 10 pm;

- by no more than 50 pm; preferably at most 45 pm, more preferably at most 40 pm, even more preferably at most 35 pm, most preferably at most 30 pm, and especially at most 25 pm; and or

- in the range of 5.0 to 50 pm; preferably in the range of 10±5.0 pm, or 12.5±7.5 pm, or 12.5±5.0 pm, or 15±10 pm, or 15±7.5 pm, or 15±5, 0 pm, or 17.5±12.5 pm, or 17.5±10 pm, or 17.5±7.5 pm, or 17.5±5.0 pm, or 20±15 pm, or 20± 12.5 pm, or 20±10 pm, or 20±7.5 pm, or 20±5.0 pm, or 22.55±17.5 pm, or 22.5±15 pm, or 22.5± 12.5 pm, or 22.5±10 pm, or 22.5±7.5 pm, or 22.5±5.0 pm, or 25±20 pm, or 25±17.5 pm, or 25± 15 pm, or 25±12.5 pm, or 25±10 pm, or 25±7.5 pm, or 25±5.0 pm.

The release film is preferably embossed; preferably micro-embossed; whereby the release film is given an embossed total layer thickness, which typically increases as a result of the embossing.

The embossed release film preferably has an embossed total layer thickness of - at least 10 pm on; preferably at least 15 pm, more preferably at least 20 pm, even more preferably at least 25 pm, most preferably at least 30 pm, and especially at least 35 pm;

- no more than 80 pm; preferably at most 75 pm, more preferably at most 70 pm, even more preferably at most 65 pm, most preferably at most 60 pm, and especially at most 55 pm; and or

- in the range from 10 to 95 pm; preferably in the range of 30±5.0 pm, or 35±10 pm, or 35±5.0 pm, or 40±15 pm, or 40±10 pm, or 40±5.0 pm, or 45±20 pm , or 45±15 pm, or 45±10 pm, or 45±5.0 pm, or 50±25 pm, or 50±20 pm, or 50±15 pm, or 50±10 pm, or 50±5, 0 pm, or 55±30 pm, or 55±25 pm, or 55±20 pm, or 55±15 pm, or 55±10 pm, or 55±5.0 pm, or 60±35 pm, or 60± 30 pm, or 60±25 pm, or 60±20 pm, or 60±15 pm, or 60±10 pm, or 60±5.0 pm.

According to the invention, the total layer thickness of an embossed release film indicates the total layer thickness without taking the embossed structure into account, i.e. the height of the embossed elevations relative to the main extension plane of the release film is not taken into account in the total layer thickness. In contrast, the embossed total layer thickness within the meaning of the invention indicates the total layer thickness of an embossed release film, taking into account the embossed structure, i.e. the height of the embossed elevations relative to the main plane of extension of the release film is taken into account in the embossed total layer thickness.

The separating film is preferably at least contact-transparent; preferably transparent. The separating film according to the invention can be fully or partially contact-transparent, i.e. what lies behind the separating film is relatively clearly recognizable when it comes into contact with the film. The separating film according to the invention is preferably fully or partially transparent, i.e. what lies behind the separating film can be seen relatively clearly, the separating film is therefore largely transparent to radiation of the visible spectrum.

The release coating is preferably applied to the release film over the entire surface or over part of the surface.

The release film according to the invention comprises the carrier film and the release coating, with the release coating preferably directly adjoining the carrier film. The release film preferably has the release coating only on the front side. In preferred embodiments, the separating film comprises the print area, which is printed, on the reverse side on the opposite second surface side.

In step (a) of the method according to the invention, a carrier film is provided which comprises a first surface side and an opposite second surface side, wherein the first surface side comprises an area which is provided for applying a release coating.

The carrier film preferably has one or more layers; preferably multilayer; more preferably three-layered.

The multilayer carrier film preferably consists of a total of two, three, four, five, six, seven, eight or nine layers; preferably three layers. The carrier film is preferably produced by blown film coextrusion, but other production processes are also possible, in particular cast film extrusion.

The carrier film preferably has a symmetrical layer sequence.

The carrier film is preferably based on polyolefin, or the carrier film comprises at least one layer which is based on polyolefin.

The polyolefin is preferably selected from the group consisting of

- thermoplastic olefins; and or

- olefin homo- or copolymers of α,β-unsaturated olefins having from 2 to 10 carbon atoms; preferably selected from the group consisting of polyethylene, polypropylene, polybutylene, polyhexene, polyoctene, copolymers and/or mixtures of at least two of the polymers mentioned; preferably ethylene homo- or copolymers or propylene homo- or copolymers.

The carrier film is preferably based on a polyolefin mixture, or the carrier film comprises at least one layer which is based on a polyolefin mixture; preferably a blend of an ethylene homo- or copolymer and a propylene homo- or copolymer.

Preferably, the ethylene homopolymer or the ethylene copolymer is selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE).

The at least one layer based on polyolefin or the at least one layer based on a polyolefin mixture preferably forms the first surface side of the carrier film.

[0077] The carrier film preferably comprises at least one layer which is based on an ethylene-vinyl acetate copolymer. The at least one layer based on ethylene-vinyl acetate copolymer preferably forms the first surface side of the carrier film.

The first surface side of the carrier film is preferably non-planar.

The carrier film is preferably embossed; preferably micro-embossed, i.e. the carrier film is already embossed before the silicone composition according to the invention is applied.

The first surface side of the carrier film preferably has embossed elevations.

The embossed elevations preferably have an average height

- of at least 5.0 μm, relative to the main plane of extension of the carrier film; preferably at least 10 pm, more preferably at least 15 pm, even more preferably at least 20 pm, most preferably at least 25 pm, and especially at least 30 pm;

- of at most 80 μm, relative to the main extension plane of the carrier film; preferably at most 70 pm, more preferably at most 60 pm, even more preferably at most 50 pm, most preferably at most 40 pm, and especially at most 30 pm; and or

- in the range from 5.0 to 80 μm, relative to the main plane of extension of the carrier film; preferably in the range of 10±5.0 pm, or 20±15 pm, or 20±5.0 pm, or 30±25 pm, or 30±15 pm, or 30±5.0 pm, or 40±35 pm , or 40±25 pm, or 40±15 pm, or 40±5.0 pm, or 50±25 pm, or 50±15 pm, or 50±5.0 pm, or 60±15 pm, or 60± 5.0pm, or 70±5.0pm.

The first surface side of the carrier film preferably has an average peak-to-valley height R _z according to DIN EN ISO 4287

- by at least 5.0 pm; preferably at least 7.0 pm, more preferably at least 9.0 pm, even more preferably at least 11 pm, most preferably at least 13 pm, and especially at least 15 pm;

- by a maximum of 100 pm; preferably at most 90 µm, more preferably at most 80 µm, even more preferably at most 70 µm, most preferably at most 60 µm, and especially at most 50 µm; and or

- in the range of 5.0 to 100 pm; preferably in the range of 10±5.0 pm, or 12.5±5.0 pm, or 15±5.0 pm, or 17.5±5.0 pm, or 20±5.0 pm, or 22, 5±5.0 pm, or 25±5.0 pm, or 27.5±5.0 pm, or 30±5.0 pm, or 32.5±5.0 pm, or 35±5.0 pm , or 37.5±5.0 pm, or 40±5.0 pm, or 42.5±5.0 pm, or 45±5.0 pm, or 47.5±5.0 pm, or 50± 5.0 pm, or 52.5±5.0 pm, or 55±5.0 pm, or 57.5±5.0 pm, or 60±5.0 pm, or 62.5±5.0 pm , or 65±5.0 pm, or 67.5±5.0 pm, or 70±5.0 pm, or 72.5±5.0 pm, or 75±5.0 pm, or 77.5±5.0 pm, or 80±5.0 pm, or 82.5±5, 0 pm, or 85±5.0 pm, or 87.5±5.0 pm, or 90±5.0 pm, or 92.5±5.0 pm, or 95±5.0 pm.

In preferred embodiments, the area of the carrier film which is intended for application of the release coating comprises at least 50% of the first surface side; preferably at least 60%, more preferably at least 70%, even more preferably at least 80%, most preferably at least 90%, and especially 100%.

In other preferred embodiments, the area which is provided for applying the release coating consists of several sub-areas; preferably format-like sub-areas; particularly preferably rectangular sections.

The area which is provided for applying the release coating preferably comprises

- at least 5.0% of the first surface side; preferably at least 15%, more preferably at least 25%, even more preferably at least 35%, most preferably at least 45%, and especially 55%; and or

- at most 95% of the first surface side; preferably at most 90%, more preferably at most 85%, even more preferably at most 80%, most preferably at most 75% and especially at most 70%.

The carrier film preferably comprises an additive or the carrier film comprises at least one layer which comprises an additive; wherein the additive is preferably selected from the group consisting of plasticizers; lubricants; emulsifiers; rheology additives; catalysts; flow control means; optical brighteners; light stabilizers; antioxidants; clarifying agents such as substituted or unsubstituted bisbenzylidene sorbitols; flame retardants; antistatic agents; UV absorbers such as benzoxazinones; propellants; and thiosynergists, such as thiodipropionic acid dilaurylestem or thiodipropionic acid distearyl esters.

The carrier film preferably comprises at least one colorant; preferably a pigment.

In preferred embodiments, the colorant of the carrier film is titanium dioxide and/or calcium carbonate.

The carrier film preferably has a white-beige coloring. In step (b) of the method according to the invention, a silicone composition is provided which comprises an auxiliary which can be detected by optical means, the silicone composition preferably being curable and/or containing a solvent.

The solvent is preferably a Ci-e-alkyl acid Ci-e-alkyl ester.

The solvent is preferably selected from the group consisting of ethyl acetate, propyl acetate and/or butyl acetate; preferably ethyl acetate.

The content of the solvent is preferably

- at least 45% by weight relative to the total weight of the silicone composition; preferably at least 50% by weight, more preferably at least 55% by weight, even more preferably at least 60% by weight, most preferably at least 65% by weight, and especially at least 70% by weight;

- at most 95% by weight relative to the total weight of the silicone composition; preferably at most 90% by weight, more preferably at most 85% by weight, even more preferably at most 80% by weight, most preferably at most 75% by weight, and especially at most 70% by weight; and or

- ranges from 45 to 95% by weight relative to the total weight of the silicone composition; preferably in the range of 50±5.0% by weight, or 55±10% by weight, or 55±5.0% by weight, or 60±15% by weight, or 60±10% by weight %, or 60±5.0% by weight, or 65±20% by weight, or 65±15% by weight, or 65±10% by weight, or 65±5.0% by weight , or 70±25% by weight, or 70±20% by weight, or 70±15% by weight, or 70±10% by weight, or 70±5.0% by weight, or 75 ±20% by weight, or 75±15% by weight, or 75±10% by weight, or 75±5.0% by weight, or 80±15% by weight, or 80±10% by weight %, or 80±5.0% by weight 0 //o.

The silicone composition is preferably curable by free-radical, cationic, and/or addition crosslinking, preferably by hydrosilylation; preferably radical.

The silicone composition is preferably curable thermally, by exposure to UV radiation, and/or by exposure to electron beams; preferably by exposure to UV radiation.

Preferably, the silicone composition comprises a silicone component; preferably a chemically cross-linkable silicone component.

The silicone component preferably comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of addition-crosslinking, preferably metal-catalyzed addition-crosslinking; condensation-crosslinking, free-radically crosslinking, and/or cationically crosslinking polysiloxanes; preferably radically crosslinking polysiloxanes. Suitable polysiloxanes are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFF™ from Dow Chemical, under the trade name Silcolease™ from Elkem Silicones, under the name DMS-R, DMS-U or DBE- U from Gelest, Inc. or under the designation KF-2005 or X-62-7205 from Shin-Etsu Chemical Co., Ltd.

The silicone component preferably comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes; preferably acrylate functionalized polysiloxanes chemically crosslinkable by UV radiation. Suitable polysiloxanes are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFF™ from Dow Chemical, under the trade name Silcolease™ from Elkem Silicones, under the name DMS-R, DMS-U or DBE- U from Gelest, Inc. or under the designation KF-2005 or X-62-7205 from Shin-Etsu Chemical Co., Ltd.

Preferably, the silicone component includes a release modifier; preferably the release modifier is an acrylate-functionalized polydimethylsiloxane. Suitable release modifiers are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFF™ from Dow Chemical, or under the trade name Silcolease™ from Elkem Silicones.

The silicone component can consist of a single chemically crosslinkable polysiloxane or can comprise a mixture of several chemically crosslinkable polysiloxanes. The silicone component preferably comprises at least one chemically crosslinkable polysiloxane and a release modifier.

The content of the silicone component is preferably

- at least 5.0% by weight relative to the total weight of the silicone composition; preferably at least 10% by weight, more preferably at least 14% by weight, even more preferably at least 18% by weight, most preferably at least 22% by weight, and especially at least 25% by weight;

- at most 55% by weight relative to the total weight of the silicone composition; preferably at most 50% by weight, more preferably at most 45% by weight, even more preferably at most 40% by weight, most preferably at most 35% by weight, and especially at most 30% by weight; and or

- ranges from 5.0 to 55% by weight relative to the total weight of the silicone composition; preferably in the range of 10±5.0% by weight, or 15±10% by weight, or 15±5.0% by weight, or 20±15% by weight, or 20±10% by weight, or 20±5.0% by weight, or 25±20% by weight, or 25±15% by weight, or 25±10 wt%, or 25±5.0 wt%, or 30±25 wt%, or 30±20 wt%, or 30±15 wt%, or 30±10 wt% %, or 30±5.0% by weight, or 35±20% by weight, or 35±15% by weight, or 35±10% by weight, or 35±5.0% by weight , or 40±15% by weight, or 40±10% by weight, or 40±5.0% by weight, or 45±10% by weight, or 45±5.0% by weight, or 50±5.0% by weight.

The silicone composition preferably comprises a catalyst and/or a photoinitiator; preferably a photoinitiator.

The catalyst and/or photoinitiator is preferably selected from the group consisting of a-hydroxy, a-alkoxy or a-amino aryl ketones, acylphosphine oxides, aliphatic azo compounds, onium compounds or platinum compounds. Suitable photoinitiators are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFF™ from Dow Chemical, or under the trade name Silcolease™ from Elkem Silicones. Examples of suitable platinum compounds are hexachloroplatinic acid, cisplatin, platinum carbonylcyclovinylmethylsiloxane complexes, platinum divinyltetramethyldisiloxane complexes, platinum cyclovinylmethylsiloxane complexes, and platinum octanaldehyde/octanol complexes.

The content of the catalyst and/or the photoinitiator is preferably

- at least 0.4% by weight relative to the total weight of the silicone composition; preferably at least 0.5% by weight, more preferably at least 0.6% by weight, even more preferably at least 0.7% by weight, most preferably at least 0.8% by weight, and especially at least 0.9% by weight. -%;

- at most 1.5% by weight relative to the total weight of the silicone composition; preferably at most 1.4% by weight, more preferably at most 1.3% by weight, even more preferably at most 1.2% by weight, most preferably at most 1.1% by weight, and in particular at most 1.0% by weight. -%; and or

- ranges from 0.4 to 1.5% by weight relative to the total weight of the silicone composition; preferably in the range of 0.5±0.1% by weight, or 0.6±0.2% by weight, or 0.6±0.1% by weight, or 0.7±0.3 wt%, or 0.7±0.2 wt%, or 0.7±0.1 wt%, or 0.8±0.4 wt%, or 0.8±0 .3% by weight, or 0.8±0.2% by weight, or 0.8±0.1% by weight, or 0.9±0.5% by weight, or 0.9 ±0.4% by weight, or 0.9±0.3% by weight, or 0.9±0.2% by weight, or 0.9±0.1% by weight, or l .0±0.5% by weight, or 1.0±0.4% by weight, or 1.0±0.3% by weight, or 1.0±0.2% by weight, or 1.0±0.1% by weight, or 1.1±0.4% by weight, or 1.1±0.3% by weight, or 1.1±0.2% by weight %, or 1.1±0.1% by weight, or 1.2±0.3% by weight, or 1.2±0.2% by weight, or 1.2±0.1% by weight %.

The silicone composition preferably comprises a reactive diluent; preferably an acrylate functionalized reactive diluent. The reactive diluent is preferably selected from the group consisting of hexanediol diacrylate (HDDA), dipentaerythritol hexaacrylate (DPHA), tripropylene glycol diacrylate (TPGDA), pentaerythritol triacrylate (PETA), pentaerythritol tetraacrylate, neopentyl glycol diacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate (HEMA), bis[methacryloyloxy]ethyl] phosphate, glycidyl acrylates, and glycidyl methacrylates.

The content of the reactive diluent is preferably

- at least 0.9% by weight relative to the total weight of the silicone composition; preferably at least 1.0% by weight, more preferably at least 1.1% by weight, even more preferably at least 1.2% by weight, most preferably at least 1.3% by weight, and especially at least 1.4% by weight. -%;

- at most 2.0% by weight relative to the total weight of the silicone composition; preferably at most 1.9% by weight, more preferably at most 1.8% by weight, even more preferably at most 1.7% by weight, most preferably at most 1.6% by weight, and in particular at most 1.5% by weight. -%; and or

- ranges from 0.9 to 2.0% by weight relative to the total weight of the silicone composition; preferably in the range of 1.0±0.1% by weight, or 1.1±0.2% by weight, or 1.1±0.1% by weight, or 1.2±0.3 wt%, or 1.2±0.2 wt%, or 1.2±0.1 wt%, or 1.3±0.4 wt%, or 1.3±0 .3% by weight, or 1.3±0.2% by weight, or 1.3±0.1% by weight, or 1.4±0.5% by weight, or 1.4 ±0.4% by weight, or 1.4±0.3% by weight, or 1.4±0.2% by weight, or 1.4±0.1% by weight, or l .5±0.5% by weight, or 1.5±0.4% by weight, or 1.5±0.3% by weight, or 1.5±0.2% by weight, or 1.5±0.1% by weight, or 1.6±0.4% by weight, or 1.6±0.3% by weight, or 1.6±0.2% by weight %, or 1.6±0.1% by weight, or 1.7±0.3% by weight, or 1.7±0.2% by weight, or 1.7±0.1% by weight %.

The silicone composition provided in step (b) of the method according to the invention comprises an auxiliary which can be detected by optical means and with the aid of which production errors in the release coating can be detected in step (e) of the method according to the invention. For this purpose, at least one optical property of the release coating is preferably dependent on the auxiliary

The content of the auxiliary is preferably

- at least 0.2% by weight relative to the total weight of the silicone composition; preferably at least 0.3% by weight, more preferably at least 0.4% by weight, even more preferably at least 0.5% by weight, most preferably at least 0.6% by weight, and especially at least 0.7% by weight. -%;

- at most 1.0% by weight relative to the total weight of the silicone composition; preferably at most 0.95% by weight, more preferably at most 0.9% by weight, even more preferably at most 0.85% by weight, most preferably at most 0.8% by weight, and in particular at most 0.75% by weight. -%; and or - ranges from 0.2 to 1.0% by weight relative to the total weight of the silicone composition; preferably in the range of 0.3±0.1% by weight, or 0.4±0.2% by weight, or 0.4±0.1% by weight, or 0.5±0.3 wt%, or 0.5±0.2 wt%, or 0.5±0.1 wt%, or 0.6±0.4 wt%, or 0.6±0 .3% by weight, or 0.6±0.2% by weight, or 0.6±0.1% by weight, or 0.7±0.3% by weight, or 0.7 ±0.2% by weight, or 0.7±0.1% by weight, or 0.8±0.2% by weight, or 0.8±0.1% by weight, or 0 .9±0.1 wt%.

The auxiliary is preferably selected from the group consisting of colorants, preferably dyes and/or pigments; whitening; and their mixtures.

Preferably, the adjuvant selectively absorbs and/or scatters light in the visible wavelength range; preferably in a wavelength range of 400 to 750 nm.

Preferably, the adjuvant is a colorant; preferably an organic or an inorganic colorant.

For the purposes of the invention, a colorant is a coloring substance.

Colorants preferred according to the invention are inorganic colorants or organic colorants with regard to their chemical composition. Colorants preferred according to the invention are natural colorants or synthetic colorants with regard to their origin. Colorants preferred according to the invention are white colorants, black colorants, chromatic colorants, effect colorants or luminous colorants with regard to their color. Colorants preferred according to the invention are pigments or dyes with regard to their solubility; Dyes are typically soluble in application media such as water or other solvents, while pigments are practically insoluble and exist in application media as a particulate solid, possibly in suspension.

The adjuvant preferably comprises a mixture of two or more colorants.

The colorant is preferably a dye, preferably selected from chromatic dyes, black dyes and/or fluorescent dyes.

According to the invention, it is possible for the auxiliary to comprise or consist of a fluorescent dye. Coloring the silicone composition and thus also the release coating with fluorescent dye has the advantage that this is only visible under UV radiation and therefore does not impair the aesthetic appearance of the release film in daylight. However, the adjuvant preferably does not include a fluorescent dye. Thus, release films generally do not have sufficient barrier properties, so that fluorescent dyes within the intended storage time, which can cause so-called "ghost prints" to occur. It is therefore preferred according to the invention to use as auxiliaries those colorants which show little or no tendency to migrate.

The dye is preferably selected from the group consisting of alizarin violet, crystal violet, mauvein, indigo, process cyan, solid green, brilliant yellow, Indian yellow, chrome yellow, saffron, solid yellow, benzaurine, pyranthrone orange, eosin, crimson, naphthol red, aurine, and/or aniline black.

Dyes which are not toxic to humans are preferably used.

Preferably the colorant is a pigment; preferably selected from white pigments, colored pigments, black pigments, luminescent pigments, and/or effect pigments, preferably metal effect pigments, pearlescent pigments, or interference pigments.

The pigment is preferably selected from the group consisting of dioxazine violet, Berlin blue, indanthrone blue, cobalt blue, phthalocyanine blue, ultramarine, chromium oxide green, green earth, verdigris, cobalt green, phthalocyanine green, benzimidazolones, bismuth vanadate, brilliant yellow, chromium antimony titanate, indolinones, nickel dioxin yellow, Nickel titanium yellow, aureolin, cerium sulfide, perinone, quinacridones, dibromoanthanthrone, diketopyrrolopyrrole pigments, perylene red, 3,4,9,10-perylenetetracarboxylic acid dianhydride (PTCDA), umber, barium sulfate, white lead, calcium carbonate, lithopones, titanium dioxide , zinc oxide, zinc sulfide, aniline black, iron oxide black, and/or spinel black. Suitable pigments are commercially available, for example under the trade name Process Cyan UFG 50080 (Flint Group).

Such pigments are preferably used which are not toxic to humans.

The colorant is preferably a blue, black and/or violet colorant.

The adjuvant preferably brings about a coloring of the silicone composition and thus also of the release coating. The silicone composition is preferably colored blue, black and/or violet.

The adjuvant is preferably particulate; preferably with an average particle size of at least 10 nm, preferably at least 50 nm, more preferably at least 100 nm, even more preferably at least 200 nm, most preferably at least 500 nm, and in particular at least 1.0 μm; at most 10 pm, preferably at most 5.0 pm. more preferably at most 2.0 µm, still more preferably at most 1.0 µm, most preferably at most 0.5 µm, and especially at most 0.2 µm; and or

- in the range from 0.01 to 10 pm; preferably in the range of 0.1±0.05 pm, or 0.2±0.1 pm, or 0.2±0.05 pm, or 0.4±0.2 pm, or 0.4±0, l pm, or 0.4±0.05 pm, or 0.8±0.4 pm, or 0.8±0.2 pm, or 0.8±0.1 pm, or 0.8±0, 05 pm, or l.6±0.8 pm, or l.6±0.4 pm, or l.6±0.2 pm, or l.6±0.1 pm, or l.6±0, 05 pm, or 3.2±1.6 pm, or 3.2±0.8 pm, or 3.2±0.4 pm, or 3.2±0.2 pm, or 3.2±0, l pm, or 3.2±0.05 pm, or 6.4±3.2 pm, or 6.4±1.6 pm, or 6.4±0.8 pm, or 6.4±0, 4 pm, or 6.4±0.2 pm, or 6.4±0.1 pm, or 6.4±0.05 pm, or 8.0±1.6 pm, or 8.0±0, 8 pm, or 8.0±0.4 pm, or 8.0±0.2 pm, or 8.0±0.1 pm, or 8.0±0.05 pm; according to the invention, the average particle size is preferably determined according to DIN 66165-1:2016-08 and relates to the mass-based average diameter d(50).

Preferably the excipient is non-spherical; preferably rod-shaped or plate-shaped.

The adjuvant preferably has an aspect ratio of at least 1.1; preferably at least 1.2, more preferably at least 1.3, even more preferably at least 1.4, most preferably at least 1.5, and especially at least 1.6.

The adjuvant is particularly preferably a particulate non-spherical pigment.

The excipient is preferably spatially anisotropically aligned in the course of the method according to the invention; preferably in step (d); particularly preferably by evaporating at least part of the solvent.

The spatial orientation of the adjuvant is preferably dependent on the curing state of the release coating.

The release coating can be in an uncured state or in a cured state. The release coating is preferably liquid or pasty in the uncured state and the polysiloxanes preferably present are not crosslinked. In the cured state, the release coating is preferably solid and the polysiloxanes that are preferably present are crosslinked. The release coating is preferably in the cured state. The adjuvant preferably orients itself spatially during the curing of the silicone composition to obtain the cured release coating. According to the invention, the auxiliary contributes to influencing the optical properties of the release coating in such a way that production defects can be identified.

To produce the silicone composition provided in step (b) of the method according to the invention, the auxiliary can be mixed in pure form with the other components of the silicone composition, i.e. with the solvent described above, the silicone component described above, optionally including a release modifier, the catalyst or photoinitiator described above, and/or the reactive diluent described above.

In preferred embodiments, however, the auxiliary used as the starting material is not present in pure form, but rather already in a composition, referred to below as “matrix”. Such compositions are commercially available and known to a person skilled in the art. The components of the matrix are compatible with the other components of the silicone composition.

Preferably, the adjuvant is present in a matrix compatible with the silicone composition; the matrix in turn preferably comprising a polymerizable component, a reactive diluent and/or a photoinitiator. The polymerizable component, the reactive diluent and the photoinitiator can each independently be the same as the silicone component, release modifier, catalyst, photoinitiator or reactive diluent in the silicone composition according to the invention, or they can be different.

Preferably, the matrix compatible with the silicone composition is co-curable with the silicone composition.

Preferably, the polymerizable component of the silicone composition-compatible matrix comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of addition-crosslinking, preferably metal-catalyzed addition-crosslinking; condensation-crosslinking, free-radically crosslinking, and/or cationically crosslinking polysiloxanes; preferably radically crosslinking polysiloxanes; and/or selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes; preferably acrylate-functionalized polysiloxanes which can be chemically crosslinked by UV radiation. Suitable polysiloxanes are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFF™ from Dow Chemical, or under the trade name Silcolease™ from Elkem Silicones. The reactive diluent of the matrix compatible with the silicone composition is preferably selected from the group consisting of hexanediol diacrylate (HDDA), dipentaerythritol hexaacrylate (DPHA), tripropylene glycol diacrylate (TPGDA), pentaerythritol triacrylate (PETA), pentaerythritol tetraacrylate, neopentyl glycol diacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate (HEMA ), bis-[methacryloyloxy]-ethyl]-phosphate, glycidyl acrylates, and glycidyl methacrylates.

[0140] The photoinitiator of the matrix compatible with the silicone composition is preferably selected from the group consisting of α-hydroxy, α-alkoxy or α-amino aryl ketones, acylphosphine oxides, aliphatic azo compounds, onium compounds or platinum compounds. Suitable photoinitiators are commercially available, for example under the trade name TEGO® RC from Evonik Industries, under the trade name SYL-OFF™ from Dow Chemical, or under the trade name Silcolease™ from Elkem Silicones.

The adjuvant preferably accelerates the curing of the silicone composition; preferably the adjuvant catalyzes the curing of the silicone composition.

The at least one optical property is preferably dependent on the release coating

- from a local distribution of the excipient;

- the particle density of the excipient; and or

- from the spatial orientation of the excipient.

The at least one optical property is preferably selected from transparency, opacity, opacity, transparency, color, hue, color brightness, color saturation, color contrast, luminance, relative luminance, luminance, refractive index, reflection, gloss, and/or gray values.

The at least one optical property is particularly preferably a light/dark contrast.

The light-dark contrast is preferably a contrast between black, white and/or shades of gray.

The light-dark contrast is preferably a contrast between two colors, with the colors preferably differing in their brightness.

Preferably, the two colors are selected from all colors except black and white.

In preferred embodiments, the backing film is violet in color and the silicone composition, and thus also the release coating, is yellow in color. In this In one embodiment, the optical property is preferably the contrast between uncoated violet areas of the release film and yellow areas of the release film with an optionally cured release coating.

In particularly preferred embodiments, the carrier film has a white-beige coloration and the silicone composition and thus also the release coating has a blue, black and/or violet coloration. In this embodiment, the optical property is preferably the contrast between uncoated white-beige areas of the release film and blue, black and/or violet areas of the release film with an optionally cured release coating.

The release coating preferably has an application weight

- at least 0.1 g/m ² ; preferably at least 0.15 g/m ² , more preferably at least 0.2 g/m ² , even more preferably at least 0.25 g/m ² , most preferably at least 0.3 g/m ² , and especially at least 0.35 g/m 2 ^square meters;

- not more than 1.0 g/m ² ; preferably at most 0.9 g/m ² , more preferably at most 0.8 g/m ² , even more preferably at most 0.7 g/m ² , most preferably at most 0.6 g/m ² , and in particular at most 0.5 g/m ^square meters; and or

- in the range from 0.1 g/m ² to 1.0 g/m ² ; preferably in the range of 0.2±0.1 g/m ² , or 0.3±0.2 g/m ² , or 0.3±0.1 g/m ² , or 0.4±0.3 g /m ² , or 0.4±0.2 g/m ² , or 0.4±0, 1 g/m ² , or 0.5±0.4 g/m ² , or 0.5±0, 3 g/m ² , or 0.5±0.2 g/m ² , or 0.5±0.lg/m ² , or 0.6±0.4 g/m ² , or 0.6±0 .3 g/m ² , or 0.6±0.2 g/m ² , or 0.6±0.lg/m ² , 0.7±0.3 g/m ² , or 0.7±0 .2 g/m ² , or 0.7±0.lg/m ² , or 0.8±0.2 g/m ² , or 0.8±0.lg/m ² .

The coat weight of the release coating is the dry coat weight, i.e. the weight that the release coating has without volatile components such as solvents.

The release coating preferably has a layer thickness

- of at least 0.1 pm; preferably at least 0.15 pm, more preferably at least 0.2 pm, even more preferably at least 0.25 pm, most preferably at least 0.3 pm, and especially at least 0.35 pm;

- by a maximum of 4.0 pm; preferably at most 3.5 pm, more preferably at most 3.0 pm, even more preferably at most 2.5 pm, most preferably at most 2.0 pm, and especially at most 1.0 pm; and or

- in the range of 0.1 to 4.0 pm; preferably in the range of 0.5±0.25 pm, or 1.0±0.5 pm, or 1.0±0.25 pm, or 1.5±1.0 pm, or 1.5±0, 5 pm, or 1.5±0.25 pm, or 2.0±1.5 pm, or 2.0±1.0 pm, or 2.0±0.5 pm, or 2.0±0, 25 pm, or 2.5±1.5 pm, or 2.5±1.0 pm, or 2.5±0.5 pm, or 2.5±0.25 pm, or 3.0±1.0 pm, or 3.0±0.5 pm, or 3.0±0.25 pm, or 3.5±0.5 pm, or 3.5±0.25pm.

The release coating preferably comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

The release coating preferably comprises at least one chemically crosslinked polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes.

The release coating preferably comprises the adjuvant.

The release coating, preferably in combination with the microembossing of the release film, preferably has average release values in the range from 2.0 to 25 cN/cm compared to a test adhesive tape TESA® 7475 from Beiersdorf, preferably determined according to FINAT test method no. 10 .

The release coating, preferably in combination with the micro-embossing of the release film, preferably has maximum release values in the range from 2.0 to 40 cN/cm compared to a test adhesive tape TESA® 7475 from Beiersdorf, preferably determined according to FINAT test method no. 10 .

The method according to the invention serves to produce a separating film and/or to detect production defects in a separating film. In step (e) of the method according to the invention, at least one optical property of the release coating is determined at positions within the area in which a release coating is to be applied in order to detect production defects in the release coating.

The production defects in the release coating preferably differ at least in terms of the type of defect, the size of the defect and/or the position of the defect.

The production defects of the release coating are preferably selected from

- missing release coating;

- insufficiently applied release coating;

- uncured release coating;

- not fully cured release coating; insufficient homogeneity of the release coating; too small layer thickness of the release coating; and/or excessive layer thickness of the release coating.

According to the invention, a distinction is made between acceptable and unacceptable production defects in the release coating.

Acceptable production errors are preferably those which do not impair the general properties of the release film according to the invention and/or are below a defined threshold value; the general properties are preferably functionality, optics and/or haptics of the release film. Sections of the separating film which have acceptable production errors, which may have been marked in step (f) of the method according to the invention, are preferably not sorted out in step (h) of the method according to the invention.

[0163] Unacceptable production errors are preferably those which disturb the general properties of the release film according to the invention and/or are above a defined threshold value. Sections of the separating film which have unacceptable production errors, which may have been marked in step (f) of the method according to the invention, are preferably sorted out. Unacceptable production errors are preferably large areas of the release film according to the invention which are intended for application of the release coating but have a missing and/or insufficiently applied release coating.

Possible causes of the production errors are preferably selected from

- A foreign body on an applicator unit with which the silicone composition is applied in step (c); the distances between the production errors preferably correlate with the scope of the commissioned work;

- incorrectly set roller distances of the application unit;

- incorrectly adjusted contact pressure between cliché and substrate of the application unit;

- too high or too low viscosity of the silicone composition;

- Too high an oxygen content of a protective gas atmosphere under which the curing of the silicone composition in step (d) takes place; too high production speed;

- too low content of the photoinitiator which the silicone composition comprises; underpowering of a UV lamp used in step (d) to cure the silicone composition; and

Soiling and thus darkening of the UV lamp.

Step (a) of the method according to the invention preferably additionally comprises the surface activation of at least that region which is intended for application of the release coating, of the first surface side of the carrier film provided in (a).

The surface activation is preferably carried out by a pretreatment with plasma or corona.

According to the invention, the silicone composition can be used as a finished product or can be produced by mixing the components just before the process is carried out.

The silicone composition is preferably applied in step (c) of the method according to the invention by means of a printing method; preferably a flexographic printing process.

The silicone composition is preferably applied in step (c) with more than one pressure roller; preferably with two pressure rollers, which are preferably passed through one after the other.

Preferably, in step (c), a first silicone composition and a second silicone composition are applied sequentially; preferably wherein the first and the second silicone composition differ at least in the excipient.

Preferably step (d) of the method according to the invention comprises evaporating at least part of the solvent; preferably evaporating the solvent prior to curing of the silicone composition.

The evaporation of the solvent in step (d) preferably takes place at a temperature

- at least 30 °C; preferably at least 40°C, more preferably at least 50°C, even more preferably at least 60°C, most preferably at least 70°C, and especially at least 80°C;

- of at most 140°C, preferably at most 130°C, more preferably at most 120°C, even more preferably at most 110°C, most preferably at most 100°C, and in particular at most 90°C; and or

- in a range from 30 to 140 °C; preferably in the range of 40±10°C, or 50±20°C, or 50±10°C, or 60±30°C, or 60±20°C, or 60±10°C, or 70±40° C, or 70±30 °C, or 70±20 °C, or 70±10 °C, or 80±50 °C, or 80±40 °C, or 80±30 °C, or 80±20 °C, or 80±10 °C, or 90±50 °C, or 90±40 °C, or 90±30 °C, or 90±20 °C, or 90±10 °C.

The evaporation of the solvent in step (d) is preferably carried out at a pressure

- of at least 100 mbar; preferably at least 150 mbar, more preferably at least 200 mbar, even more preferably at least 250 mbar, most preferably at least 300 mbar, and especially at least 350 mbar;

- of a maximum of 900 mbar; preferably at most 850 mbar, more preferably at most 800 mbar, even more preferably at most 750 mbar, most preferably at most 700 mbar, and in particular at most 650 mbar; and or

- in the range from 100 mbar to 900 mbar; preferably in the range of 150±50 mbar, or 200±50 mbar, or 250±50 mbar, or 300±50 mbar, or 350±50 mbar, or 400±50 mbar, or 450±50 mbar, or 500±50 mbar , or 550±50 mbar, or 600±50 mbar, or 650±50 mbar, or 700±50 mbar, or 750±50 mbar, or 800±50 mbar, or 850±50 mbar.

Step (d) preferably comprises evaporating the solvent until it is odorless.

The solvent is preferably evaporated in step (d) down to a residual solvent content of at most 100 ppmw; preferably at most 80 ppmw, more preferably at most 60 ppmw, even more preferably at most 40 ppmw, most preferably at most 20 ppmw, especially completely (0 ppmw).

The silicone composition is preferably cured in step (d) by irradiating the silicone composition with UV radiation and/or with electron beams; preferably UV radiation.

The silicone composition is preferably irradiated in step (d)

- for at least 0.02 s; preferably at least 0.04 s, more preferably at least 0.06 s, even more preferably at least 0.08 s, most preferably at least 0.1 s, and especially at least 1.2 s;

- for a maximum of 5.0 s; preferably at most 4.5 s, more preferably at most 4.0 s, even more preferably at most 3.5 s, most preferably at most 3.0 s, and especially at most 2.5 s; and or

- in a period of 0.02 s to 5.0 s; preferably in a period of 0.06±0.04 s, or 0.08±0.04 s, or 0.1±0.04 s, or 0.12±0.04 s, or 0.14±0 .04 s, or 0.16±0.04 s, or 0.18±0.04 s, or 0.2±0.04 s, or 0.22±0.04 s, or 0.24±0 .04 s, or 0.26±0.04 s, or 0.28±0.04 s, or 0.30±0.04 s, or 0.32±0.04 s, or 0.34±0 .04 s, or 0.36±0.04 s, or 0.38±0.04 s, or 0.40±0.04 s, or 0.42±0.04 s, or 0.44±0 .04s, or 0.46±0.04s. The silicone composition is preferably irradiated in step (d) at one wavelength

- of at least 170 nm; preferably at least 190 nm, more preferably at least 210 nm, even more preferably at least 230 nm, most preferably at least 250 nm, and especially at least 270 nm;

- not more than 400 nm; preferably at most 380 nm, more preferably at most 360 nm, even more preferably at most 340 nm, most preferably at most 320 nm, and especially at most 300 nm; and or

- in the range from 170 nm to 400 nm; preferably in the range of 190±20 nm, or 200±20 nm, or 210±20 nm, or 220±20 nm, or 230±20 nm, or 240±20 nm, or 250±20 nm, or 260±20 nm , or 270±20 nm, or 280±20 nm, or 290±20 nm, or 300±20 nm, or 310±20 nm, or 320±20 nm, or 330±20 nm, or 340±20 nm, or 350±20 nm, or 360±20 nm, or 370±20 nm, or 380±20 nm.

The silicone composition is preferably irradiated in step (d) with an energy

- of at least 3.0 eV; preferably at least 4.0 eV, more preferably at least 5.0 eV, even more preferably at least 6.0 eV, most preferably at least 7.0 eV, and especially at least 8.0 eV;

- not more than 12 eV; preferably at most 11 eV, more preferably at most 10 eV, still more preferably at most 9.0 eV, most preferably at most 8.0 eV, and especially at most 7.0 eV; and or

- in the range from 3.0 eV to 12 eV; preferably in the range of 5.0±2.0 eV, or 6.0±2.0 eV, or 7.0±2.0 eV, or 8.0±2.0 eV, or 9.0±2, 0 eV, or 10±2.0 eV.

The irradiation of the silicone composition in step (d) preferably takes place under a protective gas atmosphere; the protective gas atmosphere preferably comprises essentially nitrogen.

The curing of the silicone composition in step (d) preferably takes place thermally; preferably at a temperature

- of at least 30°C, preferably at least 40°C, more preferably at least 50°C, even more preferably at least 60°C, most preferably at least 70°C, and in particular at least 80°C;

In preferred embodiments, the silicone composition comprises a photoinitiator and at least one chemically crosslinkable polysiloxane, preferably an acrylate-functionalized polysiloxane chemically crosslinkable by UV radiation. In these preferred embodiments, the silicone composition is cured in step (d) by exposure to UV radiation.

In other preferred embodiments, the silicone composition comprises at least one chemically crosslinkable polysiloxane, preferably a chemically crosslinkable acrylate-functionalized polysiloxane, and no photoinitiator. In these preferred embodiments, the silicone composition is cured in step (d) by irradiation with electron beams.

In other preferred embodiments, the silicone composition comprises a catalyst, preferably a platinum compound, and a chemically crosslinkable polysiloxane, preferably a metal-catalyzed addition-crosslinking polysiloxane. In these preferred embodiments, the silicone composition is cured thermally.

Step (e) of the method according to the invention preferably comprises the recording of measured values relating to the at least one optical property of the release coating at positions within the area with a possibly cured release coating.

[0186] The measured values are preferably recorded with the aid of an optical measuring device; preferably using a camera system; most preferably with a linear CCD camera. Suitable camera systems are commercially available, e.g. under the designation LINE CAM 8000 HS (Dr. Schenk).

Preferably the camera has a resolution in the range 50 to 200 pm and more preferably 75 to 150 pm; the camera particularly preferably has a resolution of 100 μm.

The optical measuring device preferably measures in the visible wavelength range, in the infrared wavelength range and/or in the ultraviolet wavelength range; preferably in the visible wavelength range.

The detection of production defects in the release coating is preferably based on the in

step (e) recorded readings; preferred (i) on the basis of the difference between two or more measured values which were recorded at different positions within the area with a possibly cured release coating;

(ii) based on the difference of one or more measured values compared to a reference value; and or

(iii) based on the difference in one or more measurements taken at positions within the area with any cured release coating compared to one or more measurements taken at positions outside the area with any cured release coating.

The reference value is preferably determined by means of an X-ray measuring method; preferably by X-ray fluorescence analysis.

The detection of production errors in the release coating in step (e) preferably takes place in a computer-implemented manner.

Step (e) preferably comprises illuminating the area with optionally cured release coating with light in the visible wavelength range, in the infrared wavelength range and/or in the ultraviolet wavelength range.

[0193] The illumination is preferably carried out by oblique light; whereby the measurement values are preferably recorded in bright field and/or in dark field.

[0194] The illumination preferably takes place by incident light; whereby the measurement values are preferably recorded in bright field and/or in dark field.

[0195] The illumination preferably increases the differences between two or more measured values which were recorded at different positions within the area with a possibly cured release coating.

[0196] The illumination preferably increases contrast differences, brightness differences and/or gloss differences between two or more measured values which were recorded at different positions within the area with a possibly cured release coating.

Step (c), step (e) and, if appropriate, step (f) of the process according to the invention preferably take place simultaneously. The marking of the production errors of the release coating in step (f) of the method according to the invention is preferably carried out by means of electronic data processing.

A log is preferably created during the detection of production errors in step (e) of the method according to the invention.

The protocol preferably assigns at least the type of error, the size of the error and/or the position of the error to each production error in the release coating.

A threshold value is preferably defined for the extent and/or number of production errors.

The threshold value for production defects with a missing and/or insufficiently applied release coating is preferably 1 per 10 m ² .

If the threshold value is exceeded, measures are preferably taken to eliminate the cause of the production error.

The measures for eliminating the cause of the production errors are preferably selected from

- removing a foreign body on an application unit with which the application of the silicone composition in step (c) takes place; preferably for avoiding periodically recurring production errors in which the release coating is missing and/or insufficiently applied;

- Setting the correct roller gaps of the applicator; preferably to avoid large-area production errors in which the release coating is missing, is insufficiently applied and/or has a layer thickness that is too small;

- Adjusting the contact pressure between cliché and substrate of the application unit; preferably to avoid large-area production errors in which the release coating has coating weights that are too low and/or too high;

- adjusting the viscosity of the silicone composition; preferably to avoid large-area production errors in which the release coating has coating weights that are too low and/or too high; preferably by modifying the solvent content and/or the temperature at which the silicone composition is applied in step (c);

- Reduction of the oxygen content of a protective gas atmosphere under which the curing of the silicone composition in step (d) takes place; preferably to avoid production errors in which the release coating is not and/or not fully cured; preferred by adjusting the gap dimensions through which the separating film (1) reaches the area of the protective gas atmosphere.

- reducing the production speed; preferably to avoid production errors in which the release coating is not and/or not fully cured;

- increasing the content of the photoinitiator comprising the silicone composition; preferably to avoid production errors in which the release coating is not and/or not fully cured;

- increasing the power of a UV lamp used in step (d) to cure the silicone composition; preferably to avoid production errors in which the release coating is not and/or not fully cured; and

- Removal of contamination and thus darkening of the UV lamp; preferably to avoid production errors in which the release coating is not and/or not fully cured.

The application of the silicone composition in step (c) and/or the curing of the silicone composition in step (d) of the method according to the invention is preferably interrupted if the threshold value is exceeded until the cause of the production error has been eliminated. The interruption preferably takes place automatically or intentionally.

The production errors of the release coating are preferably marked in step (f) of the method according to the invention by means of a colored marking of the production errors. The colored marking of the production errors is preferably carried out in addition to the electronic data processing. The colored marking preferably makes it easier to later find production errors in the release coating within the release film.

The marking of the production errors of the release coating in step (f) of the method according to the invention is preferably carried out in a computer-implemented manner.

Preferably, at least one printing area of the opposite second surface side is printed in step (g) by means of scattered printing; preferably in the form of a decorative print or a register print.

The pressure applied to the second surface side can preferably be seen on the opposite side through the release coating. The pressure is preferably applied spatially offset to the release coating on the second surface side.

[0211] The pressure is preferably applied to the second surface side exactly opposite the release coating.

The print preferably has a color that is produced by a colorant.

In preferred embodiments, the color of the print matches the color of the release coating. In these preferred embodiments, the auxiliary is a colorant and the same colorant is preferably used to produce the color of the print.

In other preferred embodiments, the print is a different color than the release coating. In these preferred embodiments, the auxiliary is a colorant and to produce the color of the print, a colorant is preferably used which differs from the auxiliary in that it produces a different color.

Preferably, the printing area includes the opposite second surface side

- at least 5.0% of the second surface side; preferably at least 15%, more preferably at least 25%, even more preferably at least 35%, most preferably at least 45%, and especially 55%; and or

- at most 95% of the second surface side; preferably at most 90%, more preferably at most 85%, even more preferably at most 80%, most preferably at most 75% and especially at most 70%.

Sections of the separating film that have production defects that may have been marked in step (f) are preferably sorted out by cutting the separating film.

Step (h) of the method according to the invention preferably comprises a rewinding process. The separating film is preferably on a roll and can be transferred to another roll by a rewinding process. Sections of the separating film which have production errors and are sorted out in step (h) of the method according to the invention are preferably located at the beginning and/or at the end of the roll.

Step (h) of the method according to the invention preferably comprises the identification and cutting out of sections of the separating film which have production errors. A further aspect of the invention relates to a release film comprising a carrier film which comprises a first surface side, an opposite second surface side and an area which has a release coating; where the release film

- has a total layer thickness in the range from 10 to 25 μm; and or

- is micro-embossed and has a total embossed layer thickness in the range of 30 to 60 µm; and wherein the release coating

- has an application weight of no more than 1.0 g/m ² ; preferably at most 0.6 g/m ² , more preferably at most 0.5 g/m ² ; and

- An auxiliary substance that can be detected by optical means, the auxiliary substance influencing the optical properties of the release coating in such a way that production defects can be identified.

The adjuvant is preferably a particulate non-spherical pigment.

The excipient is preferably spatially anisotropically aligned.

The release film of the present invention can be produced by the method of the present invention described above. All preferred embodiments according to the invention which have already been described above for the method according to the invention also apply analogously to the release film and will not be repeated at this point.

A further aspect of the invention relates to a preferably curable silicone composition

(i) a preferably chemically crosslinkable silicone component;

(ii) optionally a photoinitiator;

(iii) a solvent; and

(iv) an optically detectable auxiliary.

The content of the solvent is preferably at least 45% by weight, based on the total weight of the silicone composition; preferably at least 50% by weight, more preferably at least 55% by weight, even more preferably at least 60% by weight, most preferably at least 65% by weight, and especially at least 70% by weight; - at most 95% by weight relative to the total weight of the silicone composition; preferably at most 90% by weight, more preferably at most 85% by weight, even more preferably at most 80% by weight, most preferably at most 75% by weight, and especially at most 70% by weight; and or

- ranges from 45 to 95% by weight relative to the total weight of the silicone composition; preferably in the range of 50±5.0% by weight, or 55±10% by weight, or 55±5.0% by weight, or 60±15% by weight, or 60±10% by weight %, or 60±5.0% by weight, or 65±20% by weight, or 65±15% by weight, or 65±10% by weight, or 65±5.0% by weight , or 70±25% by weight, or 70±20% by weight, or 70±15% by weight, or 70±10% by weight, or 70±5.0% by weight, or 75 ±20% by weight, or 75±15% by weight, or 75±10% by weight, or 75±5.0% by weight, or 80±15% by weight, or 80±10% by weight %, or 80±5.0% by weight.

The adjuvant is preferably a particulate non-spherical pigment.

The silicone composition of the present invention can be used in the method of the present invention. All preferred embodiments according to the invention which have already been described above for the method according to the invention also apply analogously to the silicone composition and will not be repeated at this point.

A further aspect of the invention relates to a packaged item made from the above-described separating film according to the invention; preferably suitable for packaging individually packaged hygiene products.

A further aspect of the invention relates to the use of the release film according to the invention as described above as a detachable release and/or protective film for adhesive hygiene articles.

FIG. 1 schematically illustrates the method according to the invention, with different stages of the method being shown in FIGS. 1A to 1E.

Figure 1A shows the carrier film (2), which includes the first surface side (3) and the area (5) which is provided for applying the release coating (6a/b).

FIG. 1B shows the release film (1), which includes an area (5a/b) with an applied and possibly cured release coating (6a/b).

Figure IC shows the release film (1), which includes an area (5a/b) with an applied and optionally cured release coating (6a/b), the release coating (6a/b) having a production error (7). Figure ID shows the release film (1), which includes an area (5a/b) with an applied and optionally cured release coating (6a/b), the release coating (6a/b) having a production error (7). In addition, the print area (8) of the opposite, second surface side (4) is shown.

Figure IE shows the release film (1), which includes an area (5a/b) with an applied and possibly cured release coating (6a/b), the release coating (6a/b) having a production defect (7). In addition, the pressure area (8) of the opposite, second surface side (4) is shown with pressure applied.

FIG. 2 shows the release film (1), which includes an area (5a/b) with an applied and optionally cured release coating (6a/b), the release coating (6a/b) not having any production errors (7). In addition, the pressure area (8) of the opposite, second surface side (4) is shown with pressure applied.

[0236] List of reference symbols:

(1) release film

(2) Carrier film

(3) first surface side

(4) second surface side

(5) Area

(5a/b) Area with release coating, possibly cured

(5a) Area with applied release coating

(5b) Area with cured release coating

(6a/b) Release coating, optionally cured

(6a) Release coating applied

(6b) cured release coating

(7) Manufacturing Defects

(8) Pressure range

The following examples serve to illustrate the invention, but are not to be interpreted as limiting:

Example 1: An exemplary silicone composition according to the invention is summarized in the following table and can be prepared by subsequently mixing the ingredients:

Claims

Patent Claims:

1. A method for producing a release film (1) comprising the steps:

(a) Providing a carrier film (2) which comprises a first surface side (3) and an opposite second surface side (4), the first surface side (3) comprising an area (5) which is used for applying a release coating (6a/b ) is provided;

(c) applying the silicone composition to the area (5) to obtain an area (5a) with a release coating (6a);

(d) optionally curing the silicone composition applied in step (c) to obtain a region (5b) with a cured release coating (6b);

(e) determining at least one optical property of the release coating (6a/b) at positions within the area (5a/b) for detecting production errors (7) of the release coating (6a/b); wherein the at least one optical property of the release coating (6a/b) is dependent on the adjuvant;

(f) optionally marking production defects (7) identified in step (e);

(g) optionally covering at least one pressure area (8) of the opposite second surface side (4); and

(h) possibly sorting out sections of the separating film (1) which have production errors (7) which may have been marked in step (f).

2. The method according to Anspmch 1, wherein the separating film (1) has a total layer thickness in the range from 10 to 25 μm.

3. The method according to Anspmch 1 or 2, wherein the release film (1) is micro-embossed.

4. The method according to Anspmch 3, wherein the separating film (1) has an embossed total layer thickness in the range from 30 to 60 μm.

5. The method according to any one of the preceding claims, wherein the release coating (6a / b) has an application weight of at most 1.0 g / m ² ; preferably at most 0.6 g/m ² , more preferably at most 0.5 g/m ² . The method according to any one of the preceding claims, wherein step (e) occurs after step (c) and optionally step (d) but before step (g). The method according to any one of the preceding claims, wherein, based on the total weight of the silicone composition, the content of the excipient is at least 0.2% by weight; preferably at least 0.3% by weight, more preferably at least 0.4% by weight, even more preferably at least 0.5% by weight, most preferably at least 0.6% by weight, and especially at least 0.7% by weight. - The method according to any one of the preceding claims, wherein, based on the total weight of the silicone composition, the content of the auxiliary is at most 1.0% by weight; preferably at most 0.95% by weight, more preferably at most 0.9% by weight, even more preferably at most 0.85% by weight, most preferably at most 0.8% by weight, and in particular at most 0.75% by weight. -

The method according to any one of the preceding claims, wherein, based on the total weight of the silicone composition, the content of the excipient is in the range of 0.2 to 1.0% by weight; preferably in the range of 0.3±0.1% by weight, or 0.4±0.2% by weight, or 0.4±0.1% by weight, or 0.5±0.3 % by weight, or 0.5±0.2% by weight, or 0.5±0.1% by weight, or 0.6±0.4% by weight, or

0.6±0.3% by weight, or 0.6±0.2% by weight, or 0.6±0.1% by weight, or 0.7±0.3% by weight , or

0.7±0.2% by weight, or 0.7±0.1% by weight, or 0.8±0.2% by weight, or 0.8±0.1% by weight , or

0.9±0.1% by weight. The method according to any one of the preceding claims, wherein the adjuvant is selected from the group consisting of colorants, preferably dyes and/or pigments; whitening; and their mixtures. The method according to any one of the preceding claims, wherein the adjuvant selectively absorbs and/or scatters light in the visible wavelength range. The method of any one of the preceding claims, wherein the adjuvant is a colorant; preferably an organic or an inorganic colorant. The method of claim 12, wherein the adjuvant is a mixture of two or more colorants. The method according to claim 12 or 13, wherein the colorant is a dye, preferably selected from chromatic dyes, black dyes, and/or fluorescent dyes; preferably no fluorescent dye. The method of claim 14, wherein the dye is selected from the list consisting of alizarin violet, crystal violet, mauvein, indigo, process cyan, solid green, brilliant yellow, Indian yellow, chrome yellow, saffron, solid yellow, benzaurine, pyranthrone orange, eosin, crimson, naphthol red, aurine, and/or aniline black; the dye preferably being non-toxic to humans. The method of claim 12 or 13, wherein the colorant is a pigment; preferably selected from white pigments, colored pigments, black pigments, luminescent pigments, and/or effect pigments, preferably metal effect pigments, pearlescent pigments, or interference pigments. The method of claim 16, wherein the pigment is selected from the group consisting of dioxazine violet, Berlin blue, indanthrone blue, cobalt blue, phthalocyanine blue, ultramarine, chromium oxide green, green earth, verdigris, cobalt green, phthalocyanine green, benzimidazolones, bismuth vanadate, brilliant yellow, chromium antimony titanate, indolinones , nickel dioxin yellow, nickel titanium yellow, aureolin, cerium sulfide, perinone, quinacridones, dibromoanthanthrone, diketopyrrolopyrrole pigments, perylene red, 3,4,9,10-perylenetetracarboxylic acid dianhydride (PTCDA), umber, barium sulfate, white lead, calcium carbonate, lithopones, titanium dioxide, zinc oxide, zinc sulfide, aniline black, iron oxide black, and/or spinel black; preferably the pigment is non-toxic to humans. The method according to any one of claims 12 to 17, wherein the colorant is a blue, black and/or violet colorant. The method according to any one of the preceding claims, wherein the auxiliary causes a coloring of the silicone composition and thus also of the release coating (6a/b); preferably a blue, black and/or violet coloring. The method according to any one of the preceding claims, wherein the adjuvant is particulate. The method of claim 20, wherein the adjuvant has an average particle size of at least 10 nm, preferably at least 50 nm, more preferably at least 100 nm more preferably at least 200 nm, most preferably at least 500 nm, and especially at least 1.0 µm. The method according to claim 20 or 21, wherein the excipient has an average particle size of at most 10 pm, preferably at most 5.0 pm, more preferably at most 2.0 pm, even more preferably at most 1.0 pm, most preferably at most 0.5 pm, and in particular at most 0.2 pm. The method according to any one of claims 20 to 22, wherein the adjuvant has a mean particle size in the range of 0.01 to 10 µm; preferably in the range of 0.1±0.05 pm, or 0.2±0.1 pm, or 0.2±0.05 pm, or 0.4±0.2 pm, or 0.4±0, l pm, or 0.4±0.05 pm, or 0.8±0.4 pm, or 0.8±0.2 pm, or 0.8±0.1 pm, or 0.8±0, 05 pm, or l.6±0.8 pm, or l.6±0.4 pm, or l.6±0.2 pm, or l.6±0.1 pm, or l.6±0, 05 pm, or 3.2±1.6 pm, or 3.2±0.8 pm, or 3.2±0.4 pm, or 3.2±0.2 pm, or 3.2±0, l pm, or 3.2±0.05 pm, or 6.4±3.2 pm, or 6.4±1.6 pm, or 6.4±0.8 pm, or 6.4±0, 4 pm, or 6.4±0.2 pm, or 6.4±0.1 pm, or 6.4±0.05 pm, or 8.0±1.6 pm, or 8.0±0, 8 pm, or 8.0±0.4 pm, or 8.0±0.2 pm, or 8.0±0.1 pm, or 8.0±0.05 pm. The method of any one of the preceding claims, wherein the adjuvant is non-spherical; preferably rod-shaped or plate-shaped. The method according to any one of the preceding claims, wherein the adjuvant has an aspect ratio of at least 1.1; preferably at least 1.2, more preferably at least 1.3, even more preferably at least 1.4, most preferably at least 1.5, and especially at least 1.6. The method according to any one of the preceding claims, wherein the adjuvant is a particulate non-spherical pigment. The method of any one of the preceding claims, wherein the adjuvant is spatially anisotropically aligned; preferably in step (d); particularly preferably by evaporating at least part of the solvent. The method according to claim 27, wherein the spatial orientation of the adjuvant is dependent on the state of cure of the release coating (6a/b). The method of any one of the preceding claims, wherein the adjuvant is in a matrix compatible with the silicone composition; wherein the matrix preferably comprises a polymerizable component, a reactive diluent and/or a photoinitiator. The method according to any one of the preceding claims, wherein the adjuvant accelerates the curing of the silicone composition; preferably catalyzed. The method according to any one of the preceding claims, wherein the separating film (1) has a total layer thickness of at least 5.0 μm; preferably at least 6.0 pm, more preferably at least 7.0 pm, even more preferably at least 8.0 pm, most preferably at least 9.0 pm, and especially at least 10 pm. The method according to any one of the preceding claims, wherein the release film (1) has a total layer thickness of at most 50 μm; preferably at most 45 pm, more preferably at most 40 pm, even more preferably at most 35 pm, most preferably at most 30 pm, and especially at most 25 pm. The method according to any one of the preceding claims, wherein the release film (1) has a total layer thickness in the range from 5.0 to 50 µm; preferably in the range of 10±5.0 pm, or 12.5±7.5 pm, or 12.5±5.0 pm, or 15±10 pm, or 15±7.5 pm, or 15±5, 0 pm, or 17.5±12.5 pm, or 17.5±10 pm, or 17.5±7.5 pm, or 17.5±5.0 pm, or 20±15 pm, or 20± 12.5 pm, or 20±10 pm, or 20±7.5 pm, or 20±5.0 pm, or 22.55±17.5 pm, or 22.5±15 pm, or 22.5± 12.5 pm, or 22.5±10 pm, or 22.5±7.5 pm, or 22.5±5.0 pm, or 25±20 pm, or 25±17.5 pm, or 25± 15 pm, or 25±12.5 pm, or 25±10 pm, or 25±7.5 pm, or 25±5.0 pm. The method according to any one of the preceding claims, wherein the release film (1) is embossed; preferably micro-embossed. The method according to claim 34, wherein the embossed release film (1) has an embossed total layer thickness of at least 10 μm; preferably at least 15 pm, more preferably at least 20 pm, even more preferably at least 25 pm, most preferably at least 30 pm, and especially at least 35 pm. The method according to claim 34 or 35, wherein the embossed release film (1) has an embossed total layer thickness of at most 80 μm; preferably at most 75 pm, more preferred at most 70 µm, more preferably at most 65 µm, most preferably at most 60 µm, and especially at most 55 µm. The method according to any one of claims 34 to 36, wherein the embossed release film (1) has a total embossed layer thickness in the range from 10 to 95 µm; preferably in the range of 30±5.0 pm, or 35±10 pm, or 35±5.0 pm, or 40±15 pm, or 40±10 pm, or 40±5.0 pm, or 45±20 pm , or 45±15 pm, or 45±10 pm, or 45±5.0 pm, or 50±25 pm, or 50±20 pm, or 50±15 pm, or 50±10 pm, or 50±5, 0 pm, or 55±30 pm, or 55±25 pm, or 55±20 pm, or 55±15 pm, or 55±10 pm, or 55±5.0 pm, or 60±35 pm, or 60± 30 pm, or 60±25 pm, or 60±20 pm, or 60±15 pm, or 60±10 pm, or 60±5.0 pm. The method according to any one of the preceding claims, wherein the release film (1) is at least contact transparent; preferably transparent. The method according to any one of the preceding claims, wherein the release coating (6a/b) is applied to the release film (1) over the entire surface or over part of the surface. The method according to any one of the preceding claims, wherein the carrier film (2) is single-layer or multi-layer; preferably multilayer; more preferably three-layered. The method according to claim 40, wherein the multi-layer carrier film (2) consists of a total of two, three, four, five, six, seven, eight or nine layers; preferably three layers. The method according to any one of the preceding claims, wherein the carrier film (2) has a symmetrical layer sequence. The method according to any one of the preceding claims, wherein the carrier film (2) is based on polyolefin, or wherein the carrier film (2) comprises at least one layer which is based on polyolefin. The method of claim 43, wherein the polyolefin is selected from the group consisting of thermoplastic olefins. The method of claim 43 or 44, wherein the polyolefin is selected from the group consisting of olefin homo- or copolymers of α,β-unsaturated olefins having from 2 to 10 carbon atoms; preferably selected from the group consisting of polyethylene, polypropylene, polybutylene, polyhexene, polyoctene, copolymers and / or mixtures of at least two of said polymers; preferably ethylene homo- or copolymers or propylene homo- or copolymers. The method according to any one of the preceding claims, wherein the carrier film (2) is based on a polyolefin mixture, or wherein the carrier film (2) comprises at least one layer which is based on a polyolefin mixture; preferably a blend of an ethylene homo- or copolymer and a propylene homo- or copolymer. The method of claim 45 or 46, wherein the ethylene homopolymer or the ethylene copolymer is selected from the group consisting of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene Density (HDPE). The method according to any one of claims 43 to 47, wherein the at least one layer based on polyolefin or the at least one layer based on a polyolefin mixture forms the first surface side (3) of the carrier film (2). The method according to any one of the preceding claims, wherein the carrier film (2) comprises at least one layer which is based on an ethylene-vinyl acetate copolymer. The method according to claim 49, wherein the at least one layer based on ethylene-vinyl acetate copolymer forms the first surface side (3) of the carrier film (2). The method according to any one of the preceding claims, wherein the first surface side (3) of the carrier film (2) is non-planar. The method according to any one of the preceding claims, wherein the carrier film (2) is embossed; preferably micro-embossed. The method according to any one of the preceding claims, wherein the region (5) comprises at least 50% of the first surface side (3); preferably at least 60%, more preferably at least 70%, even more preferably at least 80%, most preferably at least 90%, and especially 100%. The method according to any one of the preceding claims, wherein the area (5) consists of several partial areas; preferably format-like sub-areas; particularly preferably rectangular sections. The method of claim 54, wherein the region (5) comprises at least 5.0% of the first surface side (3); preferably at least 15%, more preferably at least 25%, even more preferably at least 35%, most preferably at least 45%, and especially 55%. The method according to claim 54 or 55, wherein the region (5) comprises at most 95% of the first surface side (3); preferably at most 90%, more preferably at most 85%, even more preferably at most 80%, most preferably at most 75% and especially at most 70%. The method according to any one of the preceding claims, wherein the carrier film (2) comprises at least one colorant; preferably a pigment. The method of claim 57, wherein the colorant is titanium dioxide and/or calcium carbonate. The method according to claim 57 or 58, wherein the carrier film (2) has a white-beige coloring. The method according to any one of the preceding claims, wherein the release coating (6a/b) has an application weight of at least 0.1 g/m ² ; preferably at least 0.15 g/m ² , more preferably at least 0.2 g/m ² , even more preferably at least 0.25 g/m ² , most preferably at least 0.3 g/m ² , and especially at least 0.35 g/m 2 ^m2 . The method according to any one of the preceding claims, wherein the release coating (6a/b) has an application weight of at most 1.0 g/m ² ; preferably at most 0.9 g/m ² , more preferably at most 0.8 g/m ² , even more preferably at most 0.7 g/m ² , most preferably at most 0.6 g/m ² , and in particular at most 0.5 g/m ^m2 . The method according to any one of the preceding claims, wherein the release coating (6a/b) has a coating weight in the range of 0.1 g/m ² to 1.0 g/m ² ; preferably in the range of 0.2±0.lg/m ² , or 0.3±0.2 g/m ² , or 0.3±0.lg/m ² , or 0.4±0.3 g/ m ² , or 0.4±0.2 g/m ² , or 0.4±0.lg/m ² , or 0.5±0.4 g/m ² , or 0.5±0.3 g /m ² , or 0.5±0.2 g/m ² , or 0.5±0.lg/m ² , or 0.6±0.4 g/m ² , or 0.6±0.3 g/m ² , or 0.6±0.2 g/m ² , or 0.6±0.lg/m ² , 0.7±0.3 g/m ² , or 0.7±0.2 g/m ² , or 0.7±0.lg/m ² , or 0.8±0.2 g/m ² , or 0.8±0.lg/m ² . The method according to any one of the preceding claims, wherein the release coating (6a/b) has a layer thickness of at least 0.1 μm; preferably at least 0.15 pm, more preferred at least 0.2 µm, more preferably at least 0.25 µm, most preferably at least 0.3 µm, and especially at least 0.35 µm. The method according to any one of the preceding claims, wherein the release coating (6a/b) has a layer thickness of at most 4.0 μm; preferably at most 3.5 pm, more preferably at most 3.0 pm, even more preferably at most 2.5 pm, most preferably at most 2.0 pm, and especially at most 1.0 pm. The method according to any one of the preceding claims, wherein the release coating (6a/b) has a layer thickness in the range of 0.1 to 4.0 µm; preferably in the range of 0.5±0.25 pm, or 1.0±0.5 pm, or 1.0±0.25 pm, or 1.5±1.0 pm, or 1.5±0, 5 pm, or 1.5±0.25 pm, or 2.0±1.5 pm, or 2.0±1.0 pm, or 2.0±0.5 pm, or 2.0±0, 25 pm, or 2.5±1.5 pm, or 2.5±1.0 pm, or 2.5±0.5 pm, or 2.5±0.25 pm, or 3.0±l, 0 pm, or 3.0±0.5 pm, or 3.0±0.25 pm, or 3.5±0.5 pm, or 3.5±0.25 pm. The method according to any one of the preceding claims, wherein the release coating (6a) comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes. The method according to any one of the preceding claims, wherein the release coating (6b) comprises at least one cured polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes. The method according to any one of the preceding claims, wherein the release coating (6a/b) comprises the adjuvant. The method according to any one of the preceding claims, wherein the solvent is a Ci-e-alkyl acid Ci-6-alkyl ester. The method of claim 69, wherein the solvent is selected from the group consisting of ethyl acetate, propyl acetate, and/or butyl acetate; preferably ethyl acetate. The method according to claim 69 or 70, wherein the content of the solvent is at least 45% by weight based on the total weight of the silicone composition; preferred at least 50% by weight, more preferably at least 55% by weight, even more preferably at least 60% by weight, most preferably at least 65% by weight, and especially at least 70% by weight. The method according to any one of claims 69 to 71, wherein the content of the solvent is at most 95% by weight based on the total weight of the silicone composition; preferably at most 90% by weight, more preferably at most 85% by weight, even more preferably at most 80% by weight, most preferably at most 75% by weight, and especially at most 70% by weight. The method according to any one of claims 69 to 72, wherein the content of the solvent ranges from 45 to 95% by weight based on the total weight of the silicone composition; preferably in the range of 50±5.0% by weight, or 55±10% by weight, or 55±5.0% by weight, or 60±15% by weight, or 60±10% by weight %, or 60±5.0% by weight, or 65±20% by weight, or 65±15% by weight, or 65±10% by weight, or 65±5.0% by weight , or 70±25% by weight, or 70±20% by weight, or 70±15% by weight, or 70±10% by weight, or 70±5.0% by weight, or 75 ±20% by weight, or 75±15% by weight, or 75±10% by weight, or 75±5.0% by weight, or 80±15% by weight, or 80±10% by weight %, or 80±5.0% by weight. The method according to any one of the preceding claims, wherein the silicone composition is free-radically, cationically, and/or addition-curable, preferably by hydrosilylation; preferably radical. The method according to any one of the preceding claims, wherein the silicone composition is curable thermally, by exposure to UV radiation, and/or by exposure to electron beam radiation; preferably by irradiation with UV radiation. The method according to any one of the preceding claims, wherein the silicone composition comprises a silicone component; preferably a chemically cross-linkable silicone component. The method of claim 76, wherein the silicone component comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of addition crosslinking, preferably metal-catalyzed addition crosslinking; condensation-crosslinking, radically crosslinking and/or cationically crosslinking polysiloxanes; preferably radically crosslinking polysiloxanes. The method of claim 76 or 77, wherein the silicone component comprises at least one chemically crosslinkable polysiloxane; preferably selected from the group consisting of polydialkylsiloxanes, preferably polydimethylsiloxanes; and polyalkylarylsiloxanes, preferably polymethylphenylsiloxanes; preferably acrylate-functionalized polysiloxanes chemically crosslinkable by UV radiation. The method of any one of claims 76 to 78, wherein the silicone component comprises a release modifier; preferably the release modifier is an acrylate-functionalized polydimethylsiloxane. The method according to any one of claims 76 to 79, wherein the content of the silicone component is at least 5.0% by weight based on the total weight of the silicone composition; preferably at least 10% by weight, more preferably at least 14% by weight, even more preferably at least 18% by weight, most preferably at least 22% by weight, and especially at least 25% by weight. The method according to any one of claims 76 to 80, wherein the content of the silicone component is at most 55% by weight based on the total weight of the silicone composition; preferably at most 50% by weight, more preferably at most 45% by weight, even more preferably at most 40% by weight, most preferably at most 35% by weight, and especially at most 30% by weight. The method according to any one of claims 76 to 81, wherein the content of the silicone component is in the range of 5.0 to 55% by weight based on the total weight of the silicone composition; preferably in the range of 10±5.0% by weight, or 15±10% by weight, or 15±5.0% by weight, or 20±15% by weight, or 20±10% by weight %, or 20±5.0% by weight, or 25±20% by weight, or 25±15% by weight, or 25±10% by weight, or 25±5.0% by weight , or 30±25% by weight, or 30±20% by weight, or 30±15% by weight, or 30±10% by weight, or 30±5.0% by weight, or 35 ±20% by weight, or 35±15% by weight, or 35±10% by weight, or 35±5.0% by weight, or 40±15% by weight, or 40±10% by weight %, or 40±5.0% by weight, or 45±10% by weight, or 45±5.0% by weight, or 50±5.0% by weight. The method according to any one of the preceding claims, wherein the silicone composition comprises a catalyst and/or a photoinitiator; preferably a photoinitiator. 84. The method of claim 83, wherein the catalyst and/or photoinitiator is selected from the group consisting of α-hydroxy, α-alkoxy, or α-amino aryl ketones, acylphosphine oxides, aliphatic azo compounds, onium compounds, or platinum compounds . The method according to any one of the preceding claims, wherein the silicone composition comprises a reactive diluent; preferably an acrylate-functionalized reactive diluent. The method of claim 85, wherein the reactive diluent is selected from the group consisting of hexanediol diacrylate (HDDA), dipentaerythritol hexaacrylate (DPHA), tripropylene glycol diacrylate (TPGDA), pentaerythritol triacrylate (PETA), pentaerythritol tetraacrylate, neopentyl glycol diacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate (HEMA) , bis-[methacryloyloxy]ethyl]phosphate, glycidyl acrylates, and glycidyl methacrylates. The method according to any one of the preceding claims, wherein the at least one optical property of the release coating (6a/b) depends on a local distribution of the auxiliary. The method according to any one of the preceding claims, wherein the at least one optical property of the release coating (6a/b) is dependent on the particle density of the excipient. The method according to any one of the preceding claims, wherein the at least one optical property of the release coating (6a/b) is dependent on the spatial orientation of the excipient. The method according to any one of the preceding claims, wherein the at least one optical property is selected from transparency, opacity, opacity, translucency, color, hue, color lightness, color saturation, color contrast, luminance, relative luminance, luminance, refractive index, reflectance, gloss, and/or or gray values. The method according to any one of the preceding claims, wherein the at least one optical property is light-dark contrast. 92. The method of claim 91, wherein the light-dark contrast is a contrast between black, white, and/or gray levels. 92. The method of claim 91, wherein the light-dark contrast is a contrast between two colors, the colors preferably differing in lightness. The method of claim 91, wherein the two colors are selected from all colors except black and white. The method according to any one of the preceding claims, wherein the production defects (7) of the release coating (6a/b) differ at least in terms of the type of defect, the size of the defect and/or the position of the defect. The method according to any one of the preceding claims, wherein the production defects (7) of the release coating (6a/b) are selected from

- missing release coating (6a/b);

- insufficiently applied release coating (6a/b);

- uncured release coating (6b);

- Incompletely cured release coating (6b);

- insufficient homogeneity of the release coating (6a/b);

- insufficient layer thickness of the release coating (6a/b); and or

- the layer thickness of the release coating is too great (6a/b). The method according to any one of the preceding claims, wherein the application of the silicone composition in step (c) is carried out by means of a printing process; preferably a flexographic printing process. 98. The method of claim 97, wherein applying the silicone composition in step (c) is done with more than one pressure roller; preferably with two pressure rollers. The method of claim 97 or 98, wherein a first silicone composition and a second silicone composition are applied sequentially; preferably wherein the first and the second silicone composition differ at least in the excipient. The method of any preceding claim, wherein step (d) comprises evaporating at least a portion of the solvent; preferably evaporating the solvent prior to curing of the silicone composition. The method according to any one of the preceding claims, wherein the curing of the silicone composition in step (d) takes place by irradiating the silicone composition with UV radiation and/or with electron beams; preferably UV radiation. The method according to any one of the preceding claims, wherein the curing of the silicone composition in step (d) is thermal. 103. The method of claim 102, wherein the thermal curing occurs at a temperature of at least 30°C, preferably at least 40°C, more preferably at least 50°C more preferably at least 60°C, most preferably at least 70°C, and especially at least 80°C. The method according to claim 102 or 103, wherein the thermal curing takes place at a temperature of at most 140 °C, preferably at most 130 °C, more preferably at most 120 °C, even more preferably at most 110 °C, most preferably at most 100 °C, and in particular maximum 90 °C. The method of any one of claims 102 to 104, wherein the thermal curing is at a temperature in a range of 30 to 140°C; preferably in the range of 40±10°C, or 50±20°C, or 50±10°C, or 60±30°C, or 60±20°C, or 60±10°C, or 70±40° C, or 70±30 °C, or 70±20 °C, or 70±10 °C, or 80±50 °C, or 80±40 °C, or 80±30 °C, or 80±20 °C , or 80±10 °C, or 90±50 °C, or 90±40 °C, or 90±30 °C, or 90±20 °C, or 90±10 °C. The method according to any one of the preceding claims, wherein step (e) comprises taking measurements relating to the at least one optical property of the release coating (6a/b) at positions within the region (5a/b). The method according to claim 106, wherein the measurement values are recorded using an optical measurement device; preferably using a camera system; most preferably with a linear CCD camera. The method according to claim 107, wherein the optical measuring device measures in the visible wavelength range, in the infrared wavelength range and/or in the ultraviolet wavelength range; preferably in the visible wavelength range. The method according to any one of claims 106 to 108, wherein the detection of production errors (7) of the release coating (6a/b) takes place on the basis of the measured values recorded in step (e). The method according to claim 109, wherein the detection of production defects (7) of the release coating (6a/b) is based on the difference between two or more measured values which were recorded at different positions within the area (5a/b). The method according to claim 109 or 110, wherein the detection of production defects (7) of the release coating (6a/b) is based on the difference in one or more measured values compared to a reference value. The method according to claim 111, wherein the reference value is determined by means of an X-ray measurement method; preferably by X-ray fluorescence analysis.' The method according to any one of claims 109 to 112, wherein the detection of production defects (7) of the release coating (6a/b) is based on the difference in one or more measured values, which were recorded at positions within the area (5a/b), in comparison to one or more readings taken at positions outside the range (5a/b). The method according to any one of the preceding claims, wherein the detection of production defects (7) of the release coating (6a/b) in step (e) is computer-implemented. The method according to any one of the preceding claims, wherein step (e) comprises illuminating the region (5a/b) with light in the visible wavelength range, in the infrared wavelength range and/or in the ultraviolet wavelength range. The method of Claim 115, wherein the illuminating is by oblique light; preferably wherein the measurement values are recorded in bright field and/or in dark field. The method according to Anspmch 115, wherein the illumination is by reflected light; preferably wherein the measurement values are recorded in bright field and/or in dark field. The method of any one of claims 115 to 117, wherein the illuminating increases the differences between two or more readings taken at different positions within the region (5a/b). The method according to any one of claims 115 to 118, wherein the illuminating increases contrast differences, brightness differences and/or gloss differences between two or more measured values which were taken at different positions within the area (5a/b). The method according to any one of the preceding claims, wherein step (c), step (e) and optionally step (f) occur simultaneously. The method according to one of the preceding claims, wherein the marking of the production errors (7) of the release coating (6a/b) in step (f) takes place by means of electronic data processing. The method of claim 121, wherein a log is created during the detection of production defects (7) in step (e). The method according to claim 122, wherein the protocol assigns at least the type of error, the size of the error and/or the position of the error to each production error (7) of the release coating (6a/b). The method according to any one of claims 121 to 123, wherein a threshold value is defined for the extent and/or number of production errors (7). The method according to claim 124, wherein if the threshold value is exceeded, measures are taken to eliminate the cause of the production error (7). The method according to claim 125, wherein the measures for eliminating the cause of the production errors (7) are selected from

- removing a foreign body on an application unit with which the application of the silicone composition in step (c) takes place; preferably to avoid periodically recurring production errors (7) in which the release coating (6a/b) is missing and/or has been applied insufficiently;

- Setting the correct roller gaps of the applicator; preferably to avoid large-area production errors (7) in which the release coating (6a/b) is missing, has been applied insufficiently and/or has a layer thickness that is too small;

- Adjusting the contact pressure between cliché and substrate of the application unit; preferably to avoid large-area production errors (7) in which the release coating (6a/b) has an application weight that is too low and/or too high;

- adjusting the viscosity of the silicone composition; preferably to avoid large-area production errors (7) in which the release coating (6a/b) has an application weight that is too low and/or too high; preferably by modifying the solvent content and/or the temperature at which the silicone composition is applied in step (c); - Reduction of the oxygen content of a protective gas atmosphere under which the curing of the silicone composition in step (d) takes place; preferably to avoid production defects (7) in which the release coating (6a/b) is not and/or not fully cured; preferably by adjusting the gap dimensions through which the separating film (1) reaches the area of the protective gas atmosphere;

- reducing the production speed; preferably to avoid production defects (7) in which the release coating (6a/b) is not and/or not fully cured;

- increasing the content of the photoinitiator comprising the silicone composition; preferably to avoid production defects (7) in which the release coating (6a/b) is not and/or not fully cured;

- increasing the power of a UV lamp used in step (d) to cure the silicone composition; preferably to avoid production defects (7) in which the release coating (6a/b) is not and/or not fully cured; and

- Removal of contamination and thus darkening of the UV lamp; preferably to avoid production errors (7) in which the release coating (6a/b) is not and/or not fully cured. The method according to claim 125 or 126, wherein the application of the silicone composition in step (c) and/or the curing of the silicone composition in step (d) is interrupted if the threshold value is exceeded until the cause of the production defect (7) has been eliminated. The method according to one of the preceding claims, wherein the marking of the production errors (7) of the release coating (6a/b) in step (f) takes place by means of a colored marking of the production errors (7). The method according to any one of the preceding claims, wherein the marking of the production defects (7) of the release coating (6a/b) in step (f) is computer-implemented. The method according to any one of the preceding claims, wherein the printing in step (g) is done by scattered printing; preferably in the form of a decorative print or a register print. The method according to any one of the preceding claims, wherein the pressure applied to the second surface side (4) can be seen on the opposite side through the release coating (6a/b). The method according to any one of the preceding claims, wherein the pressure is applied spatially offset to the release coating (6a/b) on the second surface side (4). The method according to any one of the preceding claims, wherein the print is applied to the second surface side (4) just opposite the release coating (6a/b). The method of any preceding claim, wherein step (h) comprises a rewinding operation. The method according to claim 134, wherein step (h) comprises identifying and cutting out portions of the release film (1) which have production errors (7). A release film (1) comprising a carrier film (2) which comprises a first surface side (3), an opposite second surface side (4) and an area (5) which has a release coating (6a/b); wherein the release film (1)

- has a total layer thickness in the range from 10 to 25 μm; and or

- is micro-embossed and has a total embossed layer thickness in the range of 30 to 60 µm; and wherein the release coating (6a/b)

- An auxiliary substance that can be detected by optical means, the auxiliary substance influencing the optical properties of the release coating (6a/b) in such a way that production defects (7) can be identified. The release sheet (1) of claim 136, wherein the adjuvant is a particulate non-spherical pigment. The release film (1) of claim 136 or 137, wherein the adjuvant is spatially anisotropically oriented. A preferably curable silicone composition comprising (i) a preferably chemically cross-linkable silicone component; (ii) optionally a photoinitiator; (iii) a solvent; and (iv) an optically detectable auxiliary. The silicone composition according to claim 139, wherein the content of the solvent is at least 45% by weight based on the total weight of the silicone composition; preferably at least 50% by weight, more preferably at least 55% by weight, even more preferably at least 60% by weight, most preferably at least 65% by weight, and in particular at least 70% by weight. The silicone composition according to claim 139 or 140, wherein the content of the solvent is at most 95% by weight based on the total weight of the silicone composition; preferably at most 90% by weight, more preferably at most 85% by weight, even more preferably at most 80% by weight, most preferably at most 75% by weight, and especially at most 70% by weight. The silicone composition according to any one of claims 139 to 141, wherein the content of the solvent is in the range of 45 to 95% by weight based on the total weight of the silicone composition; preferably in the range of 50±5.0% by weight, or 55±10% by weight, or 55±5.0% by weight, or 60±15% by weight, or 60±10% by weight %, or 60±5.0% by weight, or 65±20% by weight, or 65±15% by weight, or 65±10% by weight, or 65±5.0% by weight , or 70±25% by weight, or 70±20% by weight, or 70±15% by weight, or 70±10% by weight, or 70±5.0% by weight, or 75 ±20% by weight, or 75±15% by weight, or 75±10% by weight, or 75±5.0% by weight, or 80±15% by weight, or 80±10% by weight %, or 80±5.0% by weight. The silicone composition of any one of claims 139 to 142, wherein the adjuvant is a particulate non-spherical pigment. A packaged item made from a release film according to any one of claims 136 to 138; preferably suitable for packaging individually packaged hygiene products. Use of a separating film according to one of Claims 136 to 138 as a detachable separating and/or protective film for adhesive hygiene articles.