CN114590052B

CN114590052B - Safety line or strip and preparation method thereof

Info

Publication number: CN114590052B
Application number: CN202011407300.3A
Authority: CN
Inventors: 蹇钰; 孙凯
Original assignee: Zhongchao Special Security Technology Co Ltd; China Banknote Printing and Minting Group Co Ltd
Current assignee: Zhongchao Special Security Technology Co Ltd; China Banknote Printing and Minting Group Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2023-08-18
Anticipated expiration: 2040-12-04
Also published as: CN114590052A

Abstract

The invention discloses a safety line or strip and a preparation method thereof, wherein the safety line or strip comprises: a substrate; the interaction layer comprises at least one microcavity and at least one color chip arranged in the microcavity, wherein the color chip can move in the microcavity and can be reversibly oriented by an external magnetic field; an optically variable layer comprising a plating layer and a relief structure, the alternating layer being capable of causing at least a portion of the optically variable layer to be revealed or hidden in response to a change in an external magnetic field; the interaction layer and the optically variable layer are respectively arranged on two opposite sides of the base material or on one side of the base material, so that the safety line or strip has the characteristics of easy identification and difficult counterfeiting.

Description

Safety line or strip and preparation method thereof

Technical Field

The invention relates to the field of optical anti-counterfeiting, in particular to a safety line or strip and a preparation method thereof.

Background

In order to prevent counterfeiting by means of scanning, copying and the like, optical anti-counterfeiting technology is widely adopted in various high-security or high-added-value products such as banknotes, financial notes and the like, and a very good effect is achieved.

The traditional technical scheme is that a micro mirror structure determined by plate making is combined with a light variable layer, and the orientation angle of the light variable layer is modulated through a pre-designed micro structure, so that the dynamic light variable effect can be formed: when the viewing angle is changed or the security document is tilted, the observer can observe the combined optical anti-counterfeiting effect of the optically variable effect of the color change and the dynamic effect of the movement of the bright light area formed by the reflection of the micromirror.

The security thread or strip is oriented by the preset micro-mirror structure and fixed after the manufacture, and the orientation angle of the optically variable layer or the moving optically variable layer cannot be changed by applying external actions such as magnetic field, electric field, pressure, temperature, humidity, atmosphere and the like, so that the security thread or strip does not have interactive anti-counterfeiting effect, and the identification anti-counterfeiting efficiency is low.

Disclosure of Invention

The invention aims to provide a safety line or strip and a preparation method thereof, which are used for solving the problem of lower safety of the existing anti-counterfeiting technology.

To achieve the above object, a first aspect of the present invention provides a security thread or stripe comprising:

a substrate;

the interaction layer comprises at least one microcavity and at least one color chip arranged in the microcavity, wherein the color chip can move in the microcavity and can be reversibly oriented by an external magnetic field;

an optically variable layer comprising a plating layer and a relief structure, the optically variable layer having optically variable features, the interaction layer being capable of causing at least a portion of the optically variable layer to be displayed or hidden in response to a change in an external magnetic field;

the interaction layer and the optically variable layer are respectively arranged on two opposite sides of the substrate or on one side of the substrate.

In an embodiment of the invention, the interaction layer further comprises a carrier, the carrier comprises a mould pressing layer and a sealing layer, the microcavity is located in the mould pressing layer, and the sealing layer is used for sealing the microcavity.

In embodiments of the invention, the color chips exhibit different hues, brightnesses and/or saturations at different viewing angles.

In an embodiment of the present invention, the color chip moves in the microcavity in a rotational and/or translational manner.

In an embodiment of the present invention, the relief structure is at least one of a holographic diffraction structure, a submicron-scale structure, and an optically reflective facet structure.

In an embodiment of the invention, the relief structure is different from the refractive index of the coating.

In an embodiment of the invention, the security thread or stripe further comprises:

a protective layer for protecting the optically variable layer, the protective layer being disposed adjacent to the optically variable layer;

and an adhesive layer for adhering the security thread or stripe to the security document.

In an embodiment of the present invention, the microcavity is a plurality of microcavities, the cross sections of the microcavities are a plurality of circles with the same diameter, and the cross sections of the microcavities form a shape of a target number or pattern.

In the embodiment of the invention, the microcavity is a plurality of microcavities, the cross sections of the microcavities are a plurality of circles with the same diameter, the cross sections of the microcavities form a plurality of target micro characters, and the target micro characters form a target number or pattern.

In a second aspect the invention provides a security document comprising a security thread or stripe as described above.

In a third aspect the invention provides a method for making a security thread or stripe, the method comprising:

forming a transparent substrate;

the alternating layer and the optically variable layer are formed on both sides of the substrate, respectively, or on one side of the substrate.

In an embodiment of the invention, the method further comprises:

a protective layer is formed on the first side and/or the second side of the optically variable layer.

In an embodiment of the invention, the method further comprises:

one or more adhesive layers are formed for adhering the security thread or stripe to the security document.

According to the technical scheme, the positions and the arrangement of the color patches are regulated and controlled through the magnetic field reversibility, and the positions and the arrangement of the color patches determine the appearance and the concealment of at least one part of the optically variable layer below the color patches, so that an optical anti-counterfeiting effect capable of realizing interactive modulation is formed; the interactive anti-counterfeiting effect can be obtained through the magnet (such as the magnet of the mobile phone loudspeaker), and the highly complex and personalized optical effect can be formed according to the position and the moving speed of the magnet; furthermore, the invention can also obtain the characteristic of accurate alignment of the microcavity of the interaction region and the optical variable layer, and form the characteristic of being more difficult to imitate, so that the safety line or strip has the characteristics of easy identification and difficult counterfeiting.

Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In order to better highlight the benefits of embodiments of the present invention, the size, number, shape of microcavities and color chips in the illustrations do not necessarily follow the actual size, number, and shape described in the embodiments. In the drawings:

FIG. 1 is a schematic structural view of a cross-section of a security thread or stripe according to an embodiment of the present invention;

FIG. 2 is a schematic top view of a security thread or stripe according to one embodiment of the present invention;

FIG. 3 (a) is a schematic top view of a security thread or stripe according to another embodiment of the present invention; FIG. 3 (b) is a schematic structural view of a cross-section of a security thread or stripe according to another embodiment of the present invention;

FIG. 4 (a) is a schematic top view of a security thread or stripe according to another embodiment of the present invention; FIG. 4 (b) is a schematic structural view of a cross-section of a security thread or stripe according to another embodiment of the present invention;

FIG. 5 (a) is a schematic top view of a security thread or stripe according to another embodiment of the present invention; FIG. 5 (b) is a schematic structural view of a cross-section of a security thread or stripe according to another embodiment of the present invention;

FIG. 6 (a) is a schematic top view of a security thread or stripe according to another embodiment of the present invention; FIG. 6 (b) is a schematic structural view of a cross-section of a security thread or stripe according to another embodiment of the present invention;

FIG. 7 is a flow chart of a method for making a security thread or stripe provided in accordance with an embodiment of the present invention;

figure 8 is a flow chart of a method for making a security thread or stripe according to another embodiment of the present invention.

Description of the reference numerals

1. Substrate 2 interaction layer

21. Microcavity 22 color chip

23. Carrier 3 optically variable layer

4. Protective layer 5 adhesive layer

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

In addition, if a directional instruction (such as up, down, left, right, front, and rear … …) is included in the embodiment of the present invention, the directional instruction is merely used to explain a relative positional relationship, a movement condition, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional instruction is correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a cross-sectional view of a security thread or stripe according to an embodiment of the present invention. As shown in fig. 1, the security thread or stripe may comprise:

A base material 1;

an interaction layer 2 comprising at least one microcavity 21 and at least one color chip 22 arranged in the microcavity, the color chip 22 being capable of movement within the microcavity 21 and being reversibly oriented by an external magnetic field;

optically variable layer 3, comprising a coating and a relief structure, the optically variable layer 3 having optically variable features, the interaction layer 2 being capable of causing at least a portion of the optically variable layer 3 to be displayed or hidden in response to a change in an external magnetic field;

wherein the interaction layer 2 and the optically variable layer 3 are respectively arranged on two opposite sides of the substrate 1 or on one side of the substrate 1.

In an embodiment of the invention, the security thread or stripe comprises a substrate 1, an interaction layer 2 and an optically variable layer 3. The interaction layer 2 and the optically variable layer 3 may be provided on opposite sides of the substrate 1, or the interaction layer 2 and the optically variable layer 3 may be provided on one side of the substrate 1.

In an embodiment of the present invention, the substrate 1 is a transparent substrate and may be selected from the group consisting of polyester based films, polyesters such as polyethylene terephthalate (Polyethylene Glycol Terephthalate, PET), polybutylene terephthalate (Polybutylene Terephthalate, PBT) and polyethylene naphthalate (Polyethylene Naphthalate two Formic Acid Glycol Ester, PEN)) and mixtures thereof, preferably PET substrates. The color patch 22 in the microcavity 21 is a laminated mechanism with a medium and a metal or a thin film patch with a magnetically oxidized pure medium multilayer structure.

In the interaction layer 2, the microcavities 21 may be produced by means of embossing. The molding method includes thermal molding and Ultraviolet (UV) molding, and preferably UV molding to manufacture the microcavities 21. The UV molding press adopts automatic operation, so that the requirement of stamping thickness can be met, the effects of clear and transparent pattern texture and high pattern positioning precision and reducibility are achieved, and the high temperature of hot molding is avoided in the whole molding process. Microcavities 21 having openings can be efficiently, stably, and mass-produced by UV molding. Preferably, the thickness of the interaction layer 2 is not more than 50 μm, and the height of the microcavity 21 contained in the interaction layer 2 is less than 50 μm; more preferably, the thickness of the interaction layer 2 is not more than 30 μm and the height of the microcavities 21 is less than 25 μm to obtain a thinner security thread or stripe.

The color patch 22 is a multilayer structure and includes at least one magnetic layer and at least one non-magnetic layer. For the magnetic layer, magnetic metal oxides and magnetic metals are considered. Magnetic metals such as iron, cobalt, nickel, rolling, etc., or magnetic oxides such as iron oxide, chromium oxide, ferrochrome oxide, etc., also include alloys to which rare earth elements are added. Compounds such as silicon dioxide, magnesium fluoride, titanium dioxide, zinc oxide, etc., or non-magnetic metals such as aluminum, chromium, copper or alloys are particularly contemplated for the non-magnetic layer. However, organic materials and organosilicon materials are also conceivable as non-magnetic layer materials. The organic material and the silicone material may further contain a pigment to form a specific color. The stacked structure of the medium and metal of the color patch 22 includes a fabry-perot structure. The stack of media and metal of the color chip 22 is a metal/media/metal structure. The stacked structure of the medium and metal of the patch 22 is a medium/metal/medium structure.

In an embodiment of the present invention, the microcavity 21 is constructed of a material that is at least partially transparent to enable viewing of the movement of the color chip 22. The material constituting the microcavity 21 may be an organic material, an inorganic material, an organic/inorganic hybrid material, or a mixed material of an organic and an inorganic material. The material constituting the microcavity 21 may be selected from the same material, or may be constituted by one or more materials together. By "transparent" material is herein understood a material through which incident electromagnetic radiation (at least in the visible wavelength range of about 380nm to about 780 nm) is substantially transmitted. In the "transparent" materials of the present invention, the transmittance should be not less than 75%. Within microcavity 21 is air or a transparent liquid that provides free movement space for color chip 22. When a liquid is chosen, the transparent liquid used should be sufficiently inert that it does not affect the optical and magnetic properties of the color chip.

In an embodiment of the invention, the interaction layer 2 comprises a microcavity 21 and a color patch 22 arranged within the microcavity 21, the color patch 22 being capable of moving in response to a changing external magnetic field, such as a magnet of a speaker of a mobile phone. The optically variable layer 3 comprises a coating and a relief structure. And, optically variable layer 3 is precisely aligned with microcavity 21, so that a precise security feature can be formed. The refractive indices of the coating and the relief structure are different, and the combination of the coating and the relief structure can form optical characteristics which change along with the observation angle, including different hues, brightness and saturation which are presented along with the observation angle. Wherein the relief structure may comprise at least one of a holographic diffractive structure, a sub-micrometer scale structure, an optically reflective facet structure. Thus, when the color patch 22 moves in accordance with a change in the external magnetic field, the color patch 22 may be caused to block or unblock at least a part of the optically variable layer 3. The movement of the color patch 22 may include rotation, translation, and a combination of both. With the movement of the colorant 22, the interaction layer 2 and the optically variable layer 3 form an interactive combined security effect. For example, with a magnetic optically variable color patch 22, as the patch 22 moves, the color of the patch 22 itself changes and the bright area formed by reflection moves dynamically. In addition, the magneto-optical patch 22 may make part of the color of the optically variable layer, such as the optically variable color formed by the multilayer interference coating or the text color formed by the printing ink, appear or hide, resulting in a complex, interactive, highly personalized optical security effect.

In embodiments of the invention, "optically variable" or "optically variable" may be understood as a change in an optical property perceived by an observer viewing the optical security element or an object containing the optical security element. Such variable optical properties are understood in particular to be the most basic perceived color properties of a person, namely hue, brightness and saturation. The visual effect of the optical security element of embodiments of the present invention on an observer can also be described by values such as color saturation, chromaticity (color intensity), color depth, light saturation and gray scale, and furthermore, the optical security element of embodiments of the present invention can be characterized by other optical features such as by its reflective capabilities. "optically variable" refers primarily to a change in the reflective power or gloss of the color patch 22 because the color patch 22 has substantially no optically variable effect of color change resulting from tilting or changing the angle of the illumination source. The color patch 22 may be a color patch 22 designed in a sheet shape.

In an embodiment of the invention, at least one microcavity 21 is provided in the interaction layer 2, at least one color chip is provided in the microcavity 21, so that the color chip 22 can move in the microcavity 21 and be reversibly oriented by an external magnetic field, and the optically variable layer 3 comprises a plating layer and a relief structure on the surface of the plating layer, the interaction layer 2 being capable of rendering at least a part of the optically variable layer 3 visible or hidden in response to a change in the external magnetic field. In this way, the position and arrangement of the color patches 22 are reversibly controlled by the magnetic field, and the position and arrangement of the color patches 22 determine the appearance and concealment of at least a portion of the optically variable layer 3 underneath, forming an optically anti-counterfeit effect that can be interactively modulated; the interactive anti-counterfeiting effect can be obtained through the magnet (such as the magnet of the mobile phone loudspeaker), and the complex and highly personalized optical effect can be formed according to the position and the moving speed of the magnet, so that the safety line or strip has the characteristics of easy identification and difficult counterfeiting.

In an embodiment of the invention, the interaction layer 2 further comprises a carrier 23, the carrier 23 comprising a mould pressing layer and a sealing layer, the microcavity 21 being located in said mould pressing layer, the sealing layer being arranged to close said microcavity 21.

In particular, the open microcavity 21 where the color chip 22 is disposed needs to be closed to form an optical security element. The carrier 23 may include a molding layer and a sealing layer. The closure of microcavity 21 is formed in two ways. One is to compound the adhesive layer coated film with microcavities 21 by means of a well-established compounding device in such a way that it is suitable for the previously described setting path of all color chips 22. The other is to seal the microcavity 21 by applying a sealing material having a density less than the filling liquid for the patch filling path where the filling liquid is retained. The sealing material may be selected from one or more of an organic material, an inorganic material, an organic/inorganic hybrid material, or a mixed material of an organic and an inorganic material. The reactive material is preferably a system curable by ultraviolet light, electron beam, visible light, infrared light, or the like, or a system curable at room temperature or thermally curable. A further layer of sealing material can be applied on the basis of the sealing structure to obtain better sealing performance.

In embodiments of the present invention, the color chips 22 exhibit different hues, brightnesses, and/or saturations at different viewing angles.

In particular, the color patch 22 may be a color patch having a fixed color or having an optically variable feature. If the color patch 22 is a color patch having a fixed color, it will exhibit different brightness at different viewing angles. If the color patch 22 is a color patch having optically variable features, different colors will appear at different viewing angles. Colors include hue, brightness, and saturation. An "optically variable" or "optical variability" is understood to mean a change in an optical property perceived by an observer looking at the optical security element or an object containing the optical security element. Such variable optical properties are understood in particular to be the most basic perceived color properties of a person, namely hue, brightness and saturation. The visual effect of the optical security element of embodiments of the present invention on an observer can also be described by values such as color saturation, chromaticity (color intensity), color depth, light saturation and gray scale, and furthermore, the optical security element of embodiments of the present invention can be characterized by other optical features such as by its reflective capabilities. Because the color patch 22 has substantially no optically variable effect of color change due to tilting or change in the angle of the illumination source, "optically variable" refers primarily to a change in the reflective power or gloss of the color patch 22. The color chip 22 may exhibit different hues, brightnesses and/or saturation levels at different viewing angles, which may allow an observer to easily and quickly identify the security feature.

In an embodiment of the present invention, the color patch 22 moves in the microcavity 21 in a rotational and/or translational manner.

Specifically, the movement of the color patch 22 within the microcavity 21 includes, but is not limited to, rotation, translation, or a combination of both. There are a number of combinations of movement of color chip 22 within the microcavity under the influence of a magnetic field, including but not limited to: at least a portion of the filters 22 in any microcavity 21 rotate, at least a portion of the filters 22 translate, or at least a portion of the filters 22 simultaneously rotate and translate. For example, in the case where the height of the microcavity 21 is small compared to the width of the color chip 22, the color chip 22 cannot rotate in the microcavity 21, but can only translate. For another example, in the case where the length of the microcavity 21 restricts the translation of the color patch 22, the color patch 22 can only rotate within the microcavity 21 and cannot translate. For another example, when the color chip 22 is large in both the length and width of the microcavity 21, the color chip 22 can rotate in the microcavity 21 and translate in the microcavity 21. The movement of the color chip 22 within the microcavity 21 allows an observer to observe different optical characteristics under different movement states of the color chip 22, so that the observer can conveniently and quickly identify the security features.

Specifically, the optically variable layer 3 includes a plating layer and a relief structure on the surface of the plating layer. The refractive indexes of the coating and the complex modulation structure are different, and the optical characteristics which change along with the observation angle can be formed after the coating and the complex modulation structure are combined, wherein the optical characteristics comprise different hues, brightness and saturation which are displayed along with the observation angle. Wherein the relief structure may comprise at least one of a holographic diffractive structure, a sub-micrometer scale structure, an optically reflective facet structure. And, optically variable layer 3 is precisely aligned with microcavity 21, so that a precise security feature can be formed. The interaction area of the target number 10, e.g. formed by the microcavity 21, and the target number 10 formed by the holographic structure may be completely coincident. This effect is different from overprinting the printed number 10 to the microcavity interaction region, and the overprinting method still generates an alignment deviation which can be distinguished by naked eyes or by a magnifying glass.

Specifically, the optically variable layer 3 includes a plating layer and a relief structure on the surface of the plating layer. The refractive indexes of the coating and the complex modulation structure are different, and the optical characteristics which change along with the observation angle can be formed after the coating and the complex modulation structure are combined, wherein the optical characteristics comprise different hues, brightness and saturation which are displayed along with the observation angle. Wherein the relief structure may comprise at least one of a holographic diffractive structure, a sub-micrometer scale structure, an optically reflective facet structure. Optically variable features (which may also be referred to in the art as flop features or color shifting features) exhibit a color that depends on the viewing angle or angle of incidence and are used to prevent counterfeiting and/or illegal copying of security documents by common color scanning, printing and copying office equipment.

a protective layer 4 for protecting the optically variable layer 3, the protective layer 4 being disposed adjacent to the optically variable layer 3;

an adhesive layer 5 for adhering the security thread or stripe to the security document.

In particular, the protective layer 4 may be used to protect the optically variable layer 3, and the protective layer may be one or more protective layers disposed adjacent to the optically variable layer 3. In view of the fact that the optically variable layer 3 such as an aluminum plating layer, a copper plating layer is easily oxidized and has poor chemical resistance, the optically variable layer can be protected by a composite transparent substrate or a protective coating layer, and can be realized by a well-established coating and compounding apparatus or a coating and printing apparatus.

Further, one or more adhesive layers 5 may be applied to each side of the security thread or stripe, the adhesive layers 5 being used to provide adhesion to the security document when the security thread or stripe is added to the security document.

Further, a cover layer (not shown) may be added, the cover layer being selected according to the requirements of the security document, so that the non-viewing surface of the security thread or stripe has a uniform appearance.

In order to better describe the technology of the present invention, the following describes the aspects of the present invention by means of several specific embodiments.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a top view of a security thread or stripe according to an embodiment of the present invention. As shown in fig. 2 and 1, the microcavity 21 is a plurality of microcavities 21, the cross-sections of the microcavities 21 are a plurality of circles with the same diameter, and the cross-sections of the microcavities 21 form a shape of a target number or pattern. The coating of the optically variable layer 3 is of a first colour and the relief structure of the optically variable layer 3 is of a second colour, the relief structure being provided in the optically variable layer 3 in an area corresponding to the target number or pattern. The color patch 22 is a plurality of round color patches 22 with optically variable diameters, and the diameters of the color patches 22 are smaller than the diameters of the microcavities 21; the color patch 22 moves in the microcavity 21 in a rotational manner.

In the embodiment of the present invention, the interaction layer 2 may be processed on one side of the substrate 1 on the substrate 1, such as filling the color chip 22, sealing the microcavity 21, and the like; then processing the optical variable layer 3 and the protective layer 4 on the other side of the base material 1, and processing the bonding layers 5 on the two sides, wherein the processing of the optical variable layer 3 can be aluminizing, the optical variable layer 3 and the interaction layer 2 are processed by adopting a double-sided UV (ultraviolet) mould pressing mode, and the relief structure of the optical variable layer 3 is accurately aligned with the target number 10 of the interaction layer 2 and can be light-changing effect of changing the color of magenta into green; the optically variable layer 3 is then coated with a protective layer 4 and on both sides with an adhesive layer 5, and the security thread or stripe is formed after slitting. The target number 10 is composed of a plurality of microcavities 21, and the color patch 22 has a smaller diameter than the microcavities 21, and thus can rotate within the microcavities 21. Since microcavity 21 is small enough, a sufficiently fine target number 10 can be formed. The color patch 22 in the microcavity 21 is a circular magnetic optical color patch 22, such as a green to blue light-changing effect. The areas outside the target number 10 are transparent and colorless, since there is no microcavity 21 and relief structure, and the aluminized layer is a colorless and transparent plating. The relief structure and microcavity 21 are machined by means of double-sided UV embossing, so that perfect alignment is possible.

The observer can observe the optically variable characteristic of the color patch 22 through the target number 10, and the target number 10 formed by the interaction layer 2 can control the optically variable color through an externally applied magnetic field, such as through a magnet of a speaker of a mobile phone, and can control the position of a bright light area formed by reflection of the color patch 22. Different from the traditional dynamic optically variable security thread anti-counterfeiting effect generated by presetting the angle of each optically variable layer through a microstructure, the color conversion controlled by a magnetic field and the movement effect of a bright light band can be observed without moving the position of the security thread under the same observation angle, and the position and the movement speed of a magnet dynamically control the region and the conversion speed generated by the optical effect in real time. The position of the magnet is fixed, the observation angle is changed, and the color and the movement effect of the bright light band which are changed along with the angle and are the same as the anti-counterfeiting effect of the traditional dynamic photosensitive variable safety line can be observed. At the same time, the relief structure beneath the target number 10 appears or is hidden under certain viewing angles due to the rotational orientation of the color patch 22. When the magnetic field orients the color flakes 22 perfectly vertically, a privacy film-like louver structure is formed: the disappearance of the target number 10 formed by the magneto-optical patch 22 when viewed vertically; the optically variable effect of the optically variable layer 3 is completely blocked and the number 10 appears when viewed obliquely, in particular when viewed almost horizontally. Thus, an interactive, highly personalized combined anti-counterfeiting effect can be formed.

Referring to fig. 3, fig. 3 (a) is a schematic structural diagram of a top view of a security thread or stripe according to another embodiment of the present invention; fig. 3 (b) is a schematic structural diagram of a cross-sectional view of a security thread or stripe according to another embodiment of the present invention, as shown in fig. 3 (a) and fig. 3 (b), the microcavity 21 is a plurality of microcavities 21, the cross-sections of the microcavities 21 are a plurality of circles with the same diameter, the cross-sections of the microcavities 21 form a plurality of target micro-characters, and the target micro-characters form a target number or pattern. The coating of the optically variable layer 3 is of a first colour and the relief structure of the optically variable layer 3 is of a second colour, the relief structure being provided in the optically variable layer 3 in an area corresponding to the target number or pattern. The color patch 22 is a plurality of round color patches 22 with optically variable diameters, and the diameters of the color patches 22 are smaller than the diameters of the microcavities 21; the color patch 22 moves in the microcavity 21 in a rotational manner.

In the embodiment of the present invention, the interaction layer 2, the optically variable layer 3, and the protective layer 4 may be formed on one side of the substrate 1, and the adhesive layer 5 may be formed on both sides, and the cut may be made to form a security thread or stripe. The optical variable layer 3 and the interaction layer 2 are processed by adopting a double-sided UV mould pressing mode, and the relief structure of the optical variable layer 3 is accurately aligned with the target number 10 of the interaction layer 2, so that the optical variable effect of changing magenta into green can be realized. Unlike the above embodiment, in the embodiment of the present invention, when the substrate 1 is used for observation, the circular test tube-shaped microcavity 21 forms the micro letter L, and the color chip in the microcavity 21 is the circular magneto-optical color chip 22, for example, the light-changing effect of changing green to blue. The relief structure of the optically variable layer 3 is precisely aligned with the target number 10 of the interactive layer 2, with a light-changing effect of changing magenta into green. The area outside the relief structure in the optically variable layer 3 is an aluminized layer, and the area outside the relief structure corresponding to the target number 10 exhibits an aluminum silvery white color.

The optical effect of the above embodiment can be achieved in this embodiment, and the difference is that the color chips 22 that compose the micro-text L form the anti-peeping film effect by reasonable control of the external magnetic field, and the micro-text L can be displayed or hidden under different viewing angles, and form the combined anti-false effect with the relief structure.

Referring to fig. 4, fig. 4 (a) is a schematic structural diagram of a top view of a security thread or stripe according to another embodiment of the present invention; fig. 4 (b) is a schematic structural diagram of a cross-sectional view of a security thread or stripe according to another embodiment of the present invention, as shown in fig. 4 (a) and fig. 4 (b), the microcavity 21 is a plurality of microcavities 21, the cross-section of the microcavity 21 is a plurality of circles with the same diameter, and the area of the interaction layer 2 where the microcavity 21 is not disposed forms a target number or pattern. In an embodiment of the invention, the coating of the optically variable layer 3 is of a first colour and the relief structure of the optically variable layer 3 is of a second colour, the relief structure being provided in the optically variable layer 3 in an area corresponding to the target number or pattern. The color patch 22 is a plurality of round color patches 22 with optically variable diameters, and the diameters of the color patches 22 are smaller than the diameters of the microcavities 21; the color patch 22 moves in the microcavity 21 in a rotational manner.

In the embodiment of the present invention, the micro-cavity 21 of the interaction layer and the relief structure of the optically variable layer 3 are processed on the substrate 1 by a double-sided UV molding method, and then the processing of the interaction layer 2, such as filling the color chip 22, sealing the micro-cavity 21, and the like, and the processing of the optically variable layer 3, such as plating the optically variable layer, are completed. And then coating adhesive layers 5 on two sides of the coating, and cutting to form the safety line or strip. The target number 10 is precisely registered with the color area of the interactive layer 2 due to the double-sided UV molding. The embodiment of the invention still adopts a circular test tube-shaped microcavity 21, and the color chips 22 in the microcavity 21 are formed by copper plating on both sides of circular magnetic color chips 22, such as bronze and nickel. Optically variable layer 3 is characterized by a magenta-to-green optically variable relief target number 10, and a magenta-to-green optically variable background outside target number 10.

Embodiments of the present invention can also achieve the interactive optical effects described in the above embodiments. In addition, the color patch 22 according to the embodiment of the present invention may have a fixed color, and when the color patch 22 has a fixed color, there is only an effect of reflecting to cause movement of the bright area, and no effect of light change. In the embodiment of the invention, the color areas of the embossed optically variable object number 10 and the interaction layer 2 are precisely aligned, that is, the color areas of the embossed optically variable object number 10 and the interaction layer 2 generate bronze color are precisely aligned, so that a more complex combined anti-counterfeiting effect is formed compared with the embodiment.

Referring to fig. 5, fig. 5 (a) is a schematic structural diagram of a top view of a security thread or stripe according to another embodiment of the present invention; fig. 5 (b) is a schematic structural view of a cross-sectional view of a security thread or stripe according to another embodiment of the present invention, as shown in fig. 5 (a) and 5 (b), the microcavity 21 is a plurality of microcavities 21, the cross-section of the microcavities 21 is a plurality of circles with the same diameter, and the cross-section of the microcavities 21 forms a plurality of target shapes. The coating of the optically variable layer 3 is of a first colour and the relief structure of the optically variable layer 2 forms a target number or pattern of a second colour. The color patch 22 is a plurality of round color patches with the same diameter and optical variability, and the diameter of the color patch 22 is smaller than the diameter of the microcavity 21; the color patch 22 moves in the microcavity 21 in a rotational manner.

In the embodiment of the present invention, the alternating layer 2 and the optically variable layer 3 are processed on the base material 1, the optically variable layer 3 is protected by coating and compounding, the adhesive layers 5 are processed on both sides, and the safety line or stripe is formed after slitting. In an embodiment of the present invention, the optically variable layer 3 comprises a target number 10 of submicron structure and a mirror structure of a rolling bar effect formed in a region outside the target number 10, and the plating layer is a light-variable plating layer, such as magenta to green. Thus, the optically variable layer 3 includes the characteristics of the optically variable target number 10 which is golden to green, and the dynamic optically variable characteristics other than the target number 10. The color chip 22 in the microcavity 21 is a circular magneto-optical color chip 22, such as green to blue, and the cross section of the microcavity 21 is formed into a test tube shape, and the color chip can only rotate in the microcavity 21.

The embodiment of the invention can realize more complex interactive optical effects, the region of the interaction layer 2 controlled by the external magnetic field and the dynamic light change region can be mutually combined in the region beyond the target number 10 to form the effect that two light change colors alternately appear, and simultaneously the rotation of the color chip 22 of the interaction layer 2 is controlled to enable the information of the dynamic light change layer to be displayed or hidden to form the interactive optical anti-counterfeiting characteristic. When a part of the optically variable target number 10 is optically variable in color, controlled by the color sheet of the interaction layer 2, an interactive and complex combination of anti-counterfeit effects can be formed by controlling the color sheet 22.

Referring to fig. 6, fig. 6 (a) is a schematic structural diagram of a top view of a security thread or stripe according to another embodiment of the present invention; fig. 6 (b) is a schematic structural diagram of a cross-sectional view of a security thread or stripe according to another embodiment of the present invention, as shown in fig. 6 (a) and fig. 6 (b), the microcavity 21 is a plurality of microcavities 21, the cross-section of the microcavity 21 is a plurality of rectangles with the same width, and the cross-section of the microcavity 21 forms a shape of a target number or pattern. The coating of the optically variable layer 3 is of a first colour and the relief structure of the optically variable layer 3 is of a second colour, the surface relief structure being provided in the optically variable layer 3 in an area corresponding to said target number or pattern. The color plates 22 are a plurality of round color plates 22 with the same diameter and optical variability, and the diameter of the color plates 22 is smaller than the length, width and height of the microcavity 21; the color patch 22 moves in the microcavity 21 in a translational and/or rotational manner.

In the embodiment of the present invention, the microcavity 21 structure of the interaction layer 2 and the relief structure of the optically variable layer 3 may be processed on the substrate 1 by means of double-sided UV molding, and then the interaction layer 2 is processed, for example, the color plate 22 is filled, the microcavity 21 is sealed, the optically variable layer 3 is processed by plating the optically variable layer, then the optically variable layer is coated with the protective layer 4, and then the two sides are coated with the adhesive layer 5, and the anti-counterfeit strip is formed after dicing. The microcavity traversing the target number 10 enables not only rotation but also horizontal movement of the color patch 22, the color patch 22 in the microcavity 21 being a circular magnetic color patch 22 with a light-changing effect of changing magenta to green. The target number 10 region of the optically variable layer 3 has a sub-wavelength structure, and the region other than 10 has no structure, so that the optically variable layer 3 can form a green-to-blue two-color light-changing structure other than the target numbers 10 and 10 that changes gold to green.

Embodiments of the present invention can be similar to the interactive optical effects of the above-described embodiments. The difference is that by controlling the movement of the color patch 22 to one side by an external magnetic field, a part of the target number 10 is generated to be composed of a sub-wavelength light-changing structure, for example, gold-changing green, and the other part is formed by the light-changing feature of magenta-changing green of the color patch 22, while the region outside the target number 10 has the light-changing feature of green-changing blue. The viewing-protection effect of the perpendicular orientation of the color flakes 22 depends on the viewing angle, and in the embodiment of the invention, the color flakes 22 are translated, and the optically variable features of the target number 10 are formed by the two different optically variable features of the interaction layer 2 and the optically variable layer 3.

The embodiment of the invention also provides a security document comprising the security thread or strip.

In particular, security documents are generally protected by several security features selected from different technical fields, produced by different suppliers and embedded in different constituent parts of the security document. To break the protection of the security document, the counterfeiter needs to obtain all the underlying material and to obtain the required processing technology, a task which is almost impossible to achieve.

Examples of security documents include, but are not limited to, value documents and value commodities. Value documents include, but are not limited to, notes, certificates, tickets, checks, vouchers, tax stamps and tax stamps, contracts, and the like. Identity documents such as passports, identity cards, visas, bank cards, credit cards, transaction cards, access documents, tickets and the like. The term "commodity of value" refers to packaging materials, particularly packaging materials for cosmeceuticals, cosmetics, electronic devices or the food industry, which may contain one or more security features to ensure the contents of the package, such as authentic medicaments. Examples of such packaging materials include, but are not limited to, labels, such as, for example, certified trademark labels, tamper evidence labels, and seals. Preferably, the security document of an embodiment of the invention is selected from the group consisting of banknotes, identity documents, such as passports, identity cards, driver's licenses and the like, more preferably banknotes. The security document comprises a security thread or stripe as described in any of the embodiments above.

Referring to fig. 7, fig. 7 is a flowchart of a method for preparing a security thread or stripe according to an embodiment of the present invention, and as shown in fig. 7, the present invention provides a method for preparing a security thread or stripe, the method comprising:

s701: forming a transparent substrate;

s702: forming an interaction layer and an optically variable layer on both sides of the substrate, respectively;

s703: forming a protective layer on the first side and/or the second side of the optically variable layer;

s704: one or more adhesive layers are formed for adhering the security thread or stripe to the security document.

In an embodiment of the present invention, the substrate is a transparent substrate and may be selected from polyester-based films. The processing of the interaction layer may be performed before or after the processing of the optically variable layer, or may be performed on the substrate and then integrated by a composite method. The above embodiments give a more specific way of processing.

The interaction layer can be stably and efficiently obtained by means of mould pressing, color chip filling and sealing. Specifically, the method comprises the following steps:

at least one microcavity having an opening is molded into the carrier.

At least one color chip is arranged in the microcavity. The color patch is arranged in the micro-cavity, comprises at least one magnetic layer and one non-magnetic layer, and can move in the micro-cavity and be reversibly oriented by an external magnetic field;

The openings of the microcavities are closed using a film.

The optically variable layer comprises a relief structure formed by embossing and one or more dielectric layers are deposited over the relief structure. Optically variable layers refer to optical features that vary with viewing angle, including hues, brightnesses, and saturations that appear differently with viewing angle, formed by the combination of relief structures and coatings that differ in refractive index. Relief structures include holographic diffractive structures, sub-micrometer scale structures, and optically reflective facet structures. The above structures may be combined with each other. In embodiments of the present invention, the microcavity 21 structure and relief structure can be precisely aligned in design, thus forming a precisely aligned security feature. For example, the interaction region of the target number 10 formed by the microcavity 21 and the relief structure may be completely coincident, which effect is different from overprinting alignment of the interaction region of the printed target number 10 and the microcavity 21, and by overprinting, an alignment deviation which can be resolved by naked eyes or by means of a magnifying glass can still be generated, and accurate alignment can reduce the error.

Further, one or more additional transparent substrates may be applied, and/or one or more protective coatings may be applied to form one or more protective layers. In view of the fact that optically variable layers such as holographic aluminum plating are easily oxidized and have poor chemical resistance, protection can be provided by way of a composite transparent substrate or a protective coating applied.

Further, one or more adhesive layers are applied. The adhesive layer is used to provide adhesion to the security document when the security thread or stripe is added to the security document.

Further, the method comprises the steps of. A covering layer can be added, and the covering layer is selected according to the requirement of the security document, so that the non-observation surface of the security thread or strip can obtain uniform appearance effect.

Referring to fig. 8, fig. 8 is a flowchart of a method for preparing a security thread or stripe according to an embodiment of the present invention, and as shown in fig. 8, the present invention provides a method for preparing a security thread or stripe, the method comprising:

S801: forming a transparent substrate;

s802: forming an alternating layer and an optically variable layer on one side of a substrate;

s803: forming a protective layer on the first side and/or the second side of the optically variable layer;

s804: one or more adhesive layers are formed for adhering the security thread or stripe to the security document.

The embodiment of the present invention is basically the same as the above embodiment except that the interactive layer and the optically variable layer are formed on one side of the substrate. The position and arrangement of the color patches are reversibly regulated and controlled through a magnetic field, and the position and arrangement of the color patches determine the appearance and concealment of at least one part of optically variable layers below the color patches, so that an optical anti-counterfeiting effect capable of being interactively modulated is formed; the interactive anti-counterfeiting effect can be obtained through the magnet (such as the magnet of the mobile phone loudspeaker), and the complex and highly personalized optical effect can be formed according to the position and the moving speed of the magnet, so that the safety line or strip has the characteristics of easy identification and difficult counterfeiting.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

The above is merely an embodiment of the present application, and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims

1. A security thread or stripe, characterized in that the security thread or stripe comprises:

a substrate;

the interaction layer comprises at least one microcavity and at least one color chip arranged in the microcavity, the microcavity is obtained by means of UV (ultraviolet) mould pressing, the color chip can move in the microcavity and can be reversibly oriented by an external magnetic field, and the movement mode of the color chip in the microcavity is rotation and/or translation;

the interaction layer and the optically variable layer are respectively arranged on two opposite sides of the base material or on one side of the base material, and the microcavity is accurately aligned with the relief structure;

The interaction layer further comprises a carrier, the carrier comprises a mould pressing layer and a sealing layer, the microcavity is positioned in the mould pressing layer, and the sealing layer is used for sealing the microcavity;

the color patch translates in the microcavity when the height of the microcavity is smaller than the width of the color patch, or rotates or translates in the microcavity when the length of the microcavity limits the translation of the color patch, or rotates or translates in the microcavity when the length, width and height of the microcavity are greater than the color patch;

the micro-cavity is a plurality of micro-cavities, the cross sections of the micro-cavities are a plurality of circles with the same diameter, and the cross sections of the micro-cavities form a shape of a target number or pattern; or alternatively

The micro-cavity is a plurality of micro-cavities, the cross sections of the micro-cavities are a plurality of circles with the same diameter, the cross sections of the micro-cavities form a plurality of target micro-characters, and the target micro-characters form a target number or pattern.

2. A security thread or stripe according to claim 1 wherein the colour flakes exhibit different hues, brightnesses and/or saturation at different viewing angles.

3. The security thread or stripe of claim 1 wherein the relief structure is at least one of a holographic diffractive structure, a sub-micrometer scale structure, an optically reflective facet structure.

4. A security thread or stripe as claimed in claim 1 wherein the relief structure is of a different refractive index to the coating.

5. The security thread or stripe of claim 1, wherein the security thread or stripe further comprises:

6. A security document comprising a security thread or stripe as claimed in any one of claims 1 to 5.

7. A method for preparing the security thread or stripe of claim 1, wherein the method comprises:

forming a transparent substrate;

an interaction layer and an optically variable layer are formed on both sides of the substrate, respectively, or on one side of the substrate.

8. The method of claim 7, wherein the method further comprises:

9. The method of claim 7, wherein the method further comprises: