CN108682284B - Optical anti-counterfeiting film for accurately washing aluminum and preparation method thereof - Google Patents
Optical anti-counterfeiting film for accurately washing aluminum and preparation method thereof Download PDFInfo
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- CN108682284B CN108682284B CN201810509241.7A CN201810509241A CN108682284B CN 108682284 B CN108682284 B CN 108682284B CN 201810509241 A CN201810509241 A CN 201810509241A CN 108682284 B CN108682284 B CN 108682284B
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Abstract
The invention discloses a preparation method of an optical anti-counterfeiting film for accurately washing aluminum, which is characterized in that a micro-nano structure is impressed on an information layer through a metal reflecting layer, and the metal reflecting layer of a micro-nano structure area is broken to be attached to the micro-nano structure of the information layer; coating an alkali-soluble photocureable coating on the metal reflecting layer to form a photosensitive protective layer, wherein light rays are incident from the base film side and irradiate the photosensitive protective layer in the micro-nano structure region through a fracture gap of the metal emitting layer to be cured; removing the uncured photosensitive protective layer and the metal emission layer corresponding to the uncured photosensitive protective layer by alkaline washing; and coating a back glue layer to obtain the optical anti-counterfeiting film with clear and accurate boundary. The method of the technical scheme of the invention can obtain the dealuminizing precision close to zero deviation by reasonable design of micro-optical nano-structures and research on the structure, the light transmission mechanism and the optical materials of the reflecting layer aiming at the conditions of low registration precision, high operation difficulty and low safety coefficient of the existing aluminum washing technology, and is suitable for various relief optical anti-counterfeiting structures.
Description
Technical Field
The invention belongs to the technical field of anti-counterfeiting, and particularly relates to an optical anti-counterfeiting film for accurately washing aluminum and a preparation method thereof.
Background
The optical variable pattern (OVI) is one of the important anti-counterfeiting technical means at present due to high technical content, complex preparation process and special optical effect. The common optical variable patterns at present have matte platinum relief effect, Fresnel lens effect, multiple effects based on holographic technology, double-color light variable technology based on zero-order diffraction and the like. These anti-counterfeiting effects are widely used in the fields of national certificates, brand protection, and the like. Optically variable patterns are typically generated based on optical diffraction or optical reflection of micro-nano structures, and are typically composed of a base film, an information layer, a reflective layer, and a back adhesive layer. In the prior art, the bidirectional positioning aluminum-washing OVI anti-counterfeiting technology is widely accepted as a high-end anti-counterfeiting technology and is applied to banknotes, outsourced certificates, valuable papers and the like in Europe and many other countries. In China, the method is also used for famous brand medicines such as beautiful pearl pharmacy, new security pharmacy, Momeide and the like.
Two common aluminum washing processes are available, one is alkali washing, which is a process of performing aluminum removing and cleaning on an aluminum plating layer through alkaline liquid. In practice, the method is adopted to firstly perform local screen printing of UV ink on the aluminized film, and after exposure and solidification, the aluminum layer in the area without the UV ink is washed out by alkali washing to obtain a local aluminum-washed pattern. Although the aluminum layer can still be corroded and washed away by using the hot washing liquid mainly containing alkali liquor, the time needed is longer, and the aluminum layer is difficult to adapt to the requirement of large-scale quick dealumination. Moreover, although the aluminum film is conveniently washed away by the alkaline washing process, hydrogen is released during operation. Therefore, the device can only be operated at a ventilation position, and the flame cannot be accessed, so that the device has certain danger. And because the traditional local aluminizing process usually comprises the steps of coating a layer of protective agent on a part needing to remain aluminizing after printing and aluminizing, and then cleaning with alkaline water. Since the resist cannot be overprinted, the yield is not high. Meanwhile, the alkaline water can corrode the edge of the aluminum layer, and fine lines or fine characters are difficult to completely remain. In addition to the alkali washing, there is a washing method in which an aluminum-washing ink is printed on the optical anti-counterfeit film after the mold pressing, then aluminum is plated, and then washing with water is performed, and the aluminum layer of the area containing the aluminum-washing ink is washed out together with the ink to form a local aluminum-washing pattern. Specifically, the water washing aluminum process is to print hydrophilic aluminum washing ink on the place needing to package transparent area and then aluminize, and since the aluminum layer is adhered to the water soluble water ink, the water soluble ink can be washed off directly with water while the aluminum layer is removed.
In practice, both methods are realized by printing, and the aluminum washing precision of the method depends on the registration precision of the printing. So far, the register precision of the two modes can only reach +/-0.2 mm, and the high-precision register printing effect cannot be obtained.
Disclosure of Invention
In view of the above-mentioned drawbacks or needs for improvement in the prior art, the present invention provides an optical anti-counterfeiting film that is precisely washed with aluminum and a method for preparing the same. The method of the technical scheme of the invention can obtain the dealuminizing precision close to zero deviation by reasonable design of micro-optical nano-structures and research on the structure, the light transmission mechanism and the optical materials of the reflecting layer aiming at the conditions of low registration precision, high operation difficulty and low safety coefficient of the existing aluminum washing technology, and is suitable for various relief optical anti-counterfeiting structures.
In order to achieve the above objects, according to one aspect of the present invention, there is provided a method for preparing an optical anti-counterfeiting film for precisely washing aluminum, characterized in that,
s1, sequentially preparing an information layer and a metal reflection layer on a base film, stamping the micro-nano structure on the information layer through the metal reflection layer, and enabling the metal reflection layer in the micro-nano structure area to be broken to be attached to the micro-nano structure of the information layer;
s2, coating an alkali-soluble light-cured coating on the metal reflecting layer to form a photosensitive protective layer, wherein light is incident from the base film side and irradiates the photosensitive protective layer of the micro-nano structure area through a fracture gap of the metal emitting layer to be cured;
s3, performing alkali washing on the photosensitive protective layer and the metal reflecting layer, and removing the uncured photosensitive protective layer and the metal emitting layer corresponding to the uncured photosensitive protective layer outside the micro-nano structure area;
s4, coating a back glue layer on the photosensitive protective layer and the information layer which are washed by alkali, and obtaining the optical anti-counterfeiting film with clear and accurate boundary.
As an optimization of the technical scheme of the invention, the depth of the micro-nano structure is preferably 0.2-5 microns, and the width of the micro-nano structure is preferably 0.2-10 microns.
As one of the technical scheme of the invention, the photosensitive protective layer is preferably formed by coating a negative photosensitive material and/or a UV-curable resin, and the coating thickness is preferably 0.2-5 microns.
As a preference of the technical scheme of the invention, the thickness of the metal reflecting layer is preferably 200-800 angstroms.
As a preferred embodiment of the present invention, the information layer is preferably formed by coating a resin insoluble in an alkaline solution, and the metal reflective layer is preferably an aluminum layer.
According to one aspect of the invention, an optical anti-counterfeiting film for accurately washing aluminum is provided, and is characterized in that the optical anti-counterfeiting film is prepared by the preparation method of any one of claims 1 to 5.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
1) according to the method of the technical scheme, the information layer without the micro-nano structure is coated on the base film, then the metal reflecting layer is coated on the information layer, the information layer without the micro-nano structure and the metal reflecting layer are obtained, and then the micro-nano structure is pressed on the information layer by using the mould pressing equipment, so that the metal reflecting layer can be completely attached to the information layer even in the micro-nano structure area, and the reflecting effect of the metal reflecting layer is guaranteed. By the mode, the anti-counterfeiting information structure of the information layer can be accurately expressed, and deviation caused by the attaching problem of the metal reflecting layer and the information layer is avoided.
The removal of the aluminum layer in the area without the nano structure is ensured through the area selective exposure without the micro-nano structure, the aluminum removal with zero deviation is realized, and the delicate optical variable pattern can be prepared;
2) according to the method of the technical scheme, the information layer and the metal reflecting layer are prepared firstly, and then the micro-nano structure of the anti-counterfeiting information is recorded on the information layer through the metal reflecting layer through the mould pressing equipment; after the information layer and the metal reflecting layer which are subjected to mould pressing are further coated with the photosensitive protective layer, light rays incident from one side of the base film can irradiate the photosensitive coating through fragment gaps of the micro-nano structure area to be cured, and the photosensitive coating can not be cured in the area without the micro-nano structure because the metal reflecting layer is not broken and light rays can not penetrate through the metal reflecting layer; therefore, in alkaline cleaning, the photosensitive coating which is not cured and the corresponding metal reflecting layer can be cleaned, so that the metal protective layer can be accurately cleaned.
3) According to the method provided by the technical scheme of the invention, after the micro-nano structure is copied to the information layer, the metal reflecting layer is further coated with the photosensitive protective layer, and after the photosensitive protective layer is cured by light, the micro-nano structure on the information layer can be prevented from being damaged in alkali washing, so that the accuracy and integrity of anti-counterfeiting information are further ensured. Meanwhile, the photosensitive protective layer can also play a certain supporting role on the structure of the anti-counterfeiting film, so that the structure of the anti-counterfeiting film is optimized, and the application range of the anti-counterfeiting film is expanded.
Drawings
FIG. 1 is a side cross-sectional view of a film after embossing in an embodiment of the present invention;
FIG. 2 is a side cross-sectional view of a film coated with a photosensitive resist in an embodiment of the present invention;
FIG. 3 is a side cross-sectional view of a film after UV exposure in an embodiment of the present invention;
FIG. 4 is a side cross-sectional view of a film after aluminum washing in an embodiment of the present invention;
FIG. 5 is a side cross-sectional view of a film after coating a layer of a backing adhesive in an embodiment of the present disclosure;
FIG. 6 is a side cross-sectional view of an optical anti-counterfeiting film accurately washed with aluminum in an embodiment of the technical solution of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention will be described in further detail with reference to specific embodiments.
In the embodiment of the technical scheme, the optical anti-counterfeiting film comprises a base material layer, an information layer, a metal reflecting layer, a photosensitive protective layer and a back adhesive layer which are sequentially stacked, wherein the base material layer is used as the protective layer on the outermost side, and the back adhesive layer is used for being attached to the surface of a marker. The surface that information layer and metal reflecting layer laminated mutually contains micro-nano structure, and this micro-nano structure provides the optically variable pattern, contains anti-fake information. Meanwhile, the corresponding position of the metal reflecting layer is attached to the micro-nano structure of the information layer. Because the micro-nano structure on the information layer is copied to the information layer through a mould pressing device in a mechanical mode under certain pressure and temperature after the metal emitting layer is prepared, the original layer structure of the metal reflecting layer is damaged under the action of the mould pressing device. That is to say, to the region that has micro-nano structure, because micro-nano structure has certain degree of depth, the layer thickness of information layer at this department is because receiving external force and changing, and the metal reflection stratum is laminated with the information layer mutually, and under the effect of external force, in order to form the micro-nano structure that has certain degree of depth on the information layer, the metal reflection stratum is the fragmentation because destroyed by external force at the regional layer structure of micro-nano structure. In other words, the molding equipment directly destroys the flatness of the metal reflective layer, causing the metal reflective layer to break and fragment, and then the micro-nano structure with a certain depth is formed on the information layer in an 'imprinting' mode. In this in-process, metal reflection stratum and information layer laminate each other all the time, including the region that has micro-nano structure, the metal reflection stratum is in cracked fragmentation state in micro-nano structure region, has certain gap, can see through illumination.
On this basis, a photosensitive protective layer is further coated on the metal reflective layer as shown in fig. 1, and is irradiated with light from the base film side. Because the metal reflecting layer is broken only in the micro-nano structure area, only the photosensitive protective layer in the area can receive light rays and is solidified, and the solidified photosensitive protective layer cannot be corroded by alkaline solution, as shown in fig. 2. Because the photosensitive protective layer is obtained by coating a material which is soluble in an alkaline solution when not cured, the uncured photosensitive coating can be washed away in the alkaline washing process, and the metal reflective layer at the lower layer is exposed, so that the metal reflective layer can be further washed away by the alkaline solution. Therefore, only the metal reflective layer and the photosensitive protective layer in the micro-nano structured region can be remained, as shown in fig. 3.
In other words, the lower surface of the information layer with the micro-nano structure area is a metal reflecting layer, and the lower surface of the metal reflecting layer is correspondingly provided with a photosensitive protective layer which is used for protecting the metal layer from being removed when alkali washing is carried out. And the area without the micro-nano structure is not provided with an aluminum coating and a photosensitive protective layer. Finally, the whole optical film shows a local aluminizing effect, an aluminized reflection effect is provided in the area with the optical effect, and an aluminized reflection effect is not provided in the area without the optical effect.
Specifically, in the present embodiment, the base material of the information layer is made of an acrylic resin polymer. By the coating process, a uniform and flat acrylic resin polymer coating is formed on the surface of the base film, and a metal reflecting layer, namely an aluminum coating, is arranged on the lower surface of the information layer. And then, copying the micro-nano structure pattern on the metal nickel plate to the information layer and the aluminum coating layer under the action of temperature and pressure. That is, in the region containing the micro-nano structure, the acrylic resin of the information layer is softened and deformed to form the micro-nano structure opposite to the nickel plate, and the micro-nano structure macroscopically shows an optically variable pattern (OVI). The aluminum layer is driven by the information layer to break and fragment, and a micro-nano structure is formed. The fragmentation of the aluminum layer leads to the light transmittance of the area to be increased sharply, and in the area without the nano structure, the surface is still flat, the aluminum layer is not cracked, and the light transmittance is not changed. Therefore, the light transmittance of the area with the micro-nano structure is different from that of the area without the micro-nano structure. The photosensitive protective layer is positioned below the metal reflecting layer and is an alkali-soluble light-cured coating which can be dissolved in an alkali solution before being cured; and (3) crosslinking and curing under the condition of UV illumination, and the cured product is insoluble in alkaline solution. UV light irradiates from the base film layer, the light transmittance of the area with the micro-nano structure is high, and the UV coating is cured. And the light transmittance of the area without the micro-nano structure is low, and the UV coating is not cured. The uncured UV coating was then removed by caustic washing, while the aluminum layer was removed in this area.
The aluminum layer is reserved in the micro-nano structure area under the protection of the solidified UV coating, so that the metal reflection effect is achieved; and the UV coating without the micro-nano structure area is completely dissolved and removed under the condition of alkali dissolution, and meanwhile, the aluminum layer is also dissolved in an alkaline solution and removed, so that the area has no metal reflection effect. The effect of local dealumination is shown in the whole pattern, and the local dealumination effect takes the edge of the micro-nano structure as a boundary. In this way, a high-precision aluminum washing of approximately 100% is achieved, with virtually no deviations. More practical tests show that the higher the aspect ratio of the micro-nano structure is, the better the aluminum washing effect is, and the clearer the boundary is.
In a specific embodiment, the base film is preferably made of polyethylene terephthalate material, and has a thickness of 12 μm to 30 μm, and the surface of the base film can be pre-coated with a release layer, so that the final product has the properties of heat transfer, cold transfer or hot stamping. Furthermore, the micro-nano structure is characterized in that the depth of the micro-structure is 0.2-5 microns, and the width of the micro-structure is 0.2-10 microns; the thickness of the aluminum plating layer is preferably equal to 200-800 angstroms; the photosensitive protective layer is an alkali-soluble photosensitive material including, but not limited to, negative photosensitive materials and UV curable resins, and the thickness of the coating is preferably 0.2 to 5 μm.
In other words, the method of the present embodiment includes the following steps:
step one, coating an information layer on a PET base film;
secondly, plating a metal reflecting layer, namely an aluminum layer, on the surface of the information layer in a vacuum aluminum plating mode;
copying the micro-nano structure of the optically variable pattern on the nickel plate onto the aluminum layer under the action of temperature and pressure;
coating an alkali-soluble photosensitive protective layer on the aluminum-plated surface, performing UV illumination on the PET base film surface, and washing with an alkali solution to remove the unexposed photosensitive protective layer and the aluminum layer in the corresponding area after exposure;
and step five, coating a back glue layer to obtain the accurate aluminum-washing optical anti-counterfeiting film with almost zero deviation.
In a specific embodiment, the method of this example is used to prepare an optical anti-counterfeiting film, which comprises the following steps;
an information layer 12 is coated on a PET base film 11 with the thickness of 19 microns and a release effect through an anilox roller coating machine, and specifically, the information layer with the thickness of 2 microns is obtained by coating at 80-150 ℃ at 80 m/min.
Then, an aluminum layer 13 with a thickness of 450 angstroms is coated on the surface of the information layer at a winding speed of 200-300m/min by using a vacuum winding coater. Then, the surface of the information layer 12 was embossed at a speed of 25m/min at 150 ℃ and a pressure of 1.0MPa on a stamper to form a rectangular wave hologram pattern, for example, in the order of micrometers, on a part of the information layer. Then an aluminized region 1301 with a micro-nano structure and an aluminized region 1302 without a micro-nano structure are formed on the aluminized layer 13. The aluminum layer 1301 having the micro-nano structure has a strong light transmittance due to the breakage of the aluminum layer, and the aluminum layer having no micro-nano structure has a weak light transmittance.
Then, an alkali-soluble UV coating 14 is coated on the aluminum-plated layer through an anilox roller, then, UV light with a wavelength of 365nm is incident from one side of the base film 11, the UV coating with the micro-nano structure region receives UV light intensity, curing and crosslinking are carried out, and an alkali-insoluble solid polymer layer 1401 is formed, while the UV light intensity without the micro-nano structure region is reflected, and the UV coating in the region is unchanged. Finally, the aluminum layer was washed away by dipping the aluminum layer in a 10% NaOH aqueous solution to remove the UV coating in the 1402 area, and dissolving the aluminum layer in the aqueous solution.
And finally, coating hot melt adhesive paste (a mixture of polyethylene-vinyl acetate, rosin pentaerythritol ester and toluene in a weight ratio of 10:10:80) on the surface of the photosensitive protective layer, taking the total weight of the information layer coating to be coated as a reference, wherein the weight of the hot melt adhesive layer paste is 20 wt%, and drying the mixture for 30s at 100 ℃ to obtain the accurately aluminum-washed optical anti-counterfeiting film with the coating weight of 1.5g/m 2.
On the hot stamping substrate, under the action of temperature and pressure, the hot melt adhesive is softened and bonded with the hot stamping substrate, then the release type base film is torn off, and a finished product with an optically variable pattern is formed on the hot stamping substrate.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A preparation method of an optical anti-counterfeiting film for accurately washing aluminum is characterized in that,
s1, sequentially preparing an information layer and a metal reflection layer on a base film, stamping the micro-nano structure on the information layer through the metal reflection layer, and enabling the metal reflection layer in the micro-nano structure area to be broken to be attached to the micro-nano structure of the information layer;
s2, coating an alkali-soluble light-cured coating on the metal reflecting layer to form a photosensitive protective layer, wherein light is incident from the base film side and irradiates the photosensitive protective layer of the micro-nano structure area through a fracture gap of the metal reflecting layer to be cured;
s3, performing alkali washing on the photosensitive protective layer and the metal reflecting layer, and removing the uncured photosensitive protective layer and the metal reflecting layer corresponding to the uncured photosensitive protective layer outside the micro-nano structure area;
s4, coating a back glue layer on the photosensitive protective layer and the information layer which are washed by alkali, and obtaining the optical anti-counterfeiting film with clear and accurate boundary.
2. The method for preparing an optical anti-counterfeiting film for accurately washing aluminum according to claim 1, wherein the micro-nano structure has a depth of 0.2-5 microns and a width of 0.2-10 microns.
3. The method for preparing an optical anti-counterfeiting film for accurately washing aluminum according to claim 1 or 2, wherein the photosensitive protective layer is formed by coating a negative photosensitive material and/or a UV-curable resin, and the coating thickness is 0.2-5 microns.
4. The method for preparing an optical anti-counterfeiting film capable of accurately washing aluminum according to claim 1 or 2, wherein the thickness of the metal reflecting layer is 200-800 angstroms.
5. The method for preparing an optical anti-counterfeiting film for accurately washing aluminum according to claim 1 or 2, wherein the information layer is made of resin coating insoluble in alkaline solution, and the metal reflecting layer is an aluminum layer.
6. An optical anti-counterfeiting film for accurately washing aluminum, which is characterized by being prepared by the preparation method of any one of claims 1-5.
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| CN111923547A (en) * | 2020-09-15 | 2020-11-13 | 上海宏盾防伪材料有限公司 | Diaphragm with micro-nano grating structure and manufacturing method thereof |
| CN117429191A (en) * | 2023-12-21 | 2024-01-23 | 上海天臣微纳米科技股份有限公司 | Local aluminized multi-medium positioning holographic paper and preparation method thereof |
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