KR101666819B1 - Security image film manufacturing method with micron unit of thickness based on lanticular lenz - Google Patents

Abstract

Disclosed is a method for manufacturing a security image film based on a lenticular lens having the thickness in a micron unit. The method for manufacturing a security image film according to the present invention comprises the steps of: (a) applying a liquefied first ultraviolet curing resin (21) on a substrate (20); (b) transcribing a first lenticular lens pattern (220) on an upper surface of the first ultraviolet curing resin (21); (c) applying a second ultraviolet curing resin (23) on the first ultraviolet curing resin (21); (d) transcribing a pattern surface of a second mold (24), on which a first lenticular lens pattern (240) is formed, on an upper surface of the second ultraviolet curing resin (23); (e) applying a third ultraviolet curing resin (25) on the second ultraviolet curing resin (23); and (f) transcribing a pattern surface of a third mold (26), on which a security image pattern (260) is formed, on an upper surface of the third ultraviolet curing resin (25) applied by the step (e). According to the present invention, a user can freely select a refractive index of an ultraviolet curing resin of each layer in a multi-layered optical film, and thus can manufacture a security image pattern in various forms and specifications. Also, since a substrate in a base film from is not used and flipping an intermediate is not required, thereby acquiring a more vivid pattern as well as a high yield, and making a thin film able to be attached to a target product by using an auto label attachment apparatus.

Description

Technical Field [0001] The present invention relates to a security image film manufacturing method based on a lenticular lens having a micron unit thickness,

The present invention relates to a method for manufacturing a security image film, and more particularly, to a method for manufacturing a security image film based on a lenticular lens which can be formed in a thin thickness in the unit of microns.

A method of manufacturing a three-dimensional film in which a lower pattern is enlarged through a microlens such as a transparent plastic lenticular lens to enable visual recognition as a stereoscopic image has been developed and used. Such a stereoscopic film manufacturing method is applied to a label for displaying genuine products or various security businesses, and is manufactured by a micro-optic security film method using a high-precision micro mold. In order to form a stereoscopic image, a set of transparent plastic lenticular lenses is precisely superimposed on the printed surface, and the stereoscopic image appears as a result of the action of the lenticular lens.

If the left eye and the right eye are alternately printed under the plastic lens, which is a lenticular lens, each image can be seen by the difference in the direction of the left and right eyes, so that a stereoscopic effect can be obtained. This is called a lenticular stereo method. This creates a manuscript by photographing a subject with a perspective with a special camera (binocular camera), and plate printing is offset printing with a flat plate of 300 sun screen.

However, according to the conventional manufacturing method, in order for the lower pattern to be enlarged through the microlenses to enable visual recognition as a stereoscopic image, the thickness of the stereoscopic film is considerable, so that an apparatus that automatically attaches to an actual product such as an auto- There is a problem.

Korean Patent No. 10-1341072 and No. 10-1384717 disclose a label for authenticity confirmation using a three-dimensional lens sheet including a plurality of nano structures and a plurality of nano structures and a three-dimensional lens, respectively. According to the above patent, a three-dimensional lens layer comprising a lenticular lens in which a plurality of semicylindrical convex lenses are arranged in parallel or a lenticular lens in which a plurality of semicircular convex lenses are continuously arranged, An identification mark formation unit including an image formation layer provided below the focal length layer; And an engaging member for allowing the identification mark forming unit to engage with the article, wherein the image forming layer comprises a plurality of nanostructures protruding at intervals and height of 50 to 200 nanometers and arranged periodically and regularly Wherein the nano structure and the focal length layer are formed of a medium having a refractive index different from that of the nanostructure and the focal length layer.

However, in order to manufacture such a conventional three-dimensional lens sheet or an authenticity label, the base layer film is formed as a base layer film between the lens layer and the image pattern layer, The refractive index of the lens layer and the base layer film, and the refractive index of the base layer film and the image pattern layer are different from each other.

In addition, according to the above-described conventional techniques, there is a limitation that the thickness of the entire layer is thickened in the process of forming each layer, and since the lens layer and the image pattern layer are formed on the upper and lower surfaces of the base layer film, There is a problem that the manufacturing process is difficult and the yield of the product is inferior.

Disclosure of the Invention The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a security image pattern film of various shapes and specifications by freely selecting the refractive index of the ultraviolet- It is not necessary to reverse the intermediate product without using a substrate in the form of a base film, so that it is possible to obtain a clearer pattern as well as a thin thickness and a high yield, and it is also possible to attach Which is capable of forming a lenticular lens-based security image film having a thickness that is as small as possible so that it is possible to make a lenticular lens.

According to an aspect of the present invention, there is provided a method of manufacturing a three-

(a) applying a liquid first curable resin (21) onto a substrate (20);

(b) The patterned surface of the first mold 22 on which the first lenticular lens pattern 220 is formed is placed on the first ultraviolet curing resin 21 applied in the step (a) Transferring the first lenticular lens pattern 220 onto the upper surface of the first ultraviolet curing resin 21;

(c) applying the second ultraviolet cured resin 23 onto the first ultraviolet curable resin 21 to which the first lenticular lens pattern 220 is transferred and cured by the step (b);

(d) The pattern surface of the second mold 24 on which the second lenticular lens pattern 240 is formed is placed on the second ultraviolet cured resin 23 applied in the step (c) Thereby transferring the second lenticular lens pattern 240 onto the upper surface of the second ultraviolet curable resin 23;

(e) applying a third ultraviolet cured resin 25 onto the second ultraviolet curable resin 23 to which the second lenticular lens pattern 240 is transferred and cured by the step (d);

(f) transferring the pattern surface of the third mold 26 on which the security image pattern 260 is formed to the upper surface of the third ultraviolet curable resin 25 applied by the step (e); And

(g) In order to make the security image pattern visible, the printing material 27 containing the colored nano powder and the ultraviolet curing resin is filled in the groove portion of the security image pattern 260 formed on the third ultraviolet curable resin 25 Coating a reflective layer on the whole of the security image pattern 260 formed on the third ultraviolet curable resin 25 or coating a material having a refractive index difference of a certain degree or more.

It is preferable that the refractive indexes of the first ultraviolet curable resin 21 and the third ultraviolet curable resin 25 are larger than the refractive index of the second ultraviolet curable resin 21.

It is more preferable that the difference between the refractive indexes of the first ultraviolet curable resin 21 and the third ultraviolet curable resin 25 and the refractive index difference of the second ultraviolet curable resin 21 is 0.125 to 0.3.

(A-1) forming a release layer on the substrate 20 before the step (a), wherein the step (a) comprises forming a first ultraviolet- 21) is also possible.

The method may further include the step of forming an additional pattern layer on the pattern layer formed by the step g) after the step g).

Between step (e) and step (f), application and curing of the third ultraviolet curable resin 25 are carried out twice, and transparent silicone is partially To form a fracture layer (242).

According to the present invention, it is possible to freely select the refractive index of the ultraviolet cured resin of each layer in an optical film having a multilayer structure composed of the first lens layer, the second lens layer and the multiple layer, and to produce a secure image pattern film of various shapes and specifications If the refractive indexes of the first ultraviolet curing resin 21, the second ultraviolet curing resin 23 and the third ultraviolet curing resin 25 and the shape of the lens are appropriately designed, it is possible to deepen the depth of focus It is possible to represent a security image displayed in three dimensions inside the surface of the product even with a thin thickness, and the security image is relatively clear compared to that produced by the prior art.

In addition, in the case of the prior art using a substrate in the form of a base film, the security image pattern layer must be formed on the other side of the substrate after the lens layer is formed on one side of the substrate. It is also difficult to obtain a clear pattern. However, the method of manufacturing a security image film based on a lenticular lens having a micron unit thickness according to the present invention is performed by sequentially laminating on one surface of a surface substrate. Therefore, there is no need to reverse the intermediate process product, so that the yield is higher than that of the conventional process, and a clearer pattern can be obtained.

In addition, according to the present invention, in particular, when a release layer is applied, the surface substrate serves only to support the first lens layer, the second lens layer, and the composite layer stacked thereon, Can be separated and removed so that a significantly thinner secure image pattern label can be produced and can be formed to a thickness thin enough to be attached to a target product using an auto labeling apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart illustrating a main process of a method for manufacturing a security image film based on a lenticular lens having a micron unit thickness according to a preferred embodiment of the present invention;
FIG. 2 is a view for explaining a process of forming a first lens layer by UV molding through steps (S101) to (S104) in the flowchart of FIG. 1;
3 is a view for explaining a process of forming a second lens layer by UV molding through steps (S106) to (S110) in the flowchart of FIG. 1,
4 is a diagram for explaining the structure of the intermediate process in which step S110 is completed in the flowchart of FIG. 1,
5 is a perspective view illustrating a process of forming a second lenticular lens pattern 240 orthogonal to the first lenticular lens pattern 220 on the first lens layer of the first lenticular lens pattern 220,
Fig. 6 is a partially cutaway perspective view showing the state of the intermediate process product formed by Fig. 5,
7 is a view for explaining a process of forming a composite layer of a third lens layer, a focal length layer and a secure image pattern through steps S112 and S114 in the flowchart of FIG. 1;
FIG. 8 is a view showing a lenticular lens-based security image film manufactured according to another embodiment of the method for manufacturing a security image film based on a lenticular lens having a unit thickness of microns according to the present invention, And that the surface substrate can be separated,
9 is a view for explaining a pressurizing roll which can be applied to coat an ultraviolet curable resin in a manufacturing method according to the present invention and its adjustable coating conditions,
10 is a cross-sectional view for explaining the action and effect of the embodiment having the destructive layer and removing the surface substrate by separation of the release layer, and
11 is a cross-sectional view for explaining the operation effect of the fracture layer formed by step S113 in the flow chart of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

FIG. 1 is a flowchart illustrating a main process of a method for manufacturing a security image film based on a lenticular lens having a micron unit thickness according to a preferred embodiment of the present invention. Referring to FIG. 1, a method for manufacturing a security image film based on a lenticular lens having a micron unit thickness according to the present invention comprises the steps of: (1) forming a substrate 20 such as poly-carbonate or PET (Step S100), and then the first ultraviolet curing resin 21 is coated (step S101). Next, the pattern surface of the first mold 22 on which the first lenticular lens pattern 220 is formed is placed on the first ultraviolet cured resin 21 applied in step S101, (Step S102). The transfer of the first lenticular lens pattern 220 onto the upper surface of the first ultraviolet curable resin 21 is completed by ultraviolet curing (step S104). Thereby, the first lens layer is formed on the surface substrate 20 by UV molding.

Next, as shown in FIG. 3, the second ultraviolet curing resin 23 is applied onto the first ultraviolet-curing resin 21 to which the first lenticular lens pattern 220 is transferred and cured by the step S104 (Step S106), and the pattern surface of the second mold 24 on which the second lenticular lens pattern 240 is formed is placed on the second ultraviolet cured resin 23 applied in step S106 and pressed The ultraviolet ray is irradiated (step S108).

When the transfer of the second lenticular lens pattern 240 to the upper surface of the second ultraviolet curing resin 23 is completed (step S110) by ultraviolet curing, as shown in Fig. 4, the first lenticular lens pattern 220 is transferred An intermediate process product in which the lens layer and the second lens layer to which the second lenticular lens pattern 240 is transferred has a laminated structure is produced.

5 and 6, the first lenticular lens pattern 220 and the second lenticular lens pattern 240 are arranged to face each other, as shown in FIGS. 5 and 6, And is formed in a precisely orthogonal structure. Referring to FIG. 5, a second lens layer of a second lenticular lens pattern 240 orthogonal to the first lenticular lens pattern 220 is formed on the first lens layer of the first lenticular lens pattern 220, ≪ / RTI >

7, the second lenticular lens pattern 240 is transferred onto the second lenticular lens pattern 240 of the cured second ultraviolet cured resin 23 by the step S110, The secure image pattern 260 formed on the third mold 26 is applied to the upper surface of the third ultraviolet curing resin 25 applied by the step S112 And the protective image pattern 260 is transferred onto the surface of the third cured resin by pressurization and ultraviolet irradiation (step S114). The layer formed by step S114 is composed of a third lens layer formed by the interface between the second cured resin 23 and the third cured resin 25 and a third lens layer formed by the focus from the third lens layer to the secure image pattern The distance layer, and the focal length layer to a security image pattern layer corresponding to a security image that is imaged through the focal length layer. Particularly in the prior art, there is no base film type substrate provided between the security image layer and the lens layer. Therefore, the security image pattern product manufactured by the manufacturing method according to the present invention solves the problem that the image is blurred in the process of passing through the security image layer having the same refractive index, the substrate and the lens layer, Thereby providing a pattern image.

8 illustrates a lenticular lens-based security image film manufactured by a method for manufacturing a security image film based on a lenticular lens having a micron unit thickness according to another embodiment of the present invention. The security image film has a destructive layer, And it is possible to separate the surface substrate. 8, a printing material 27 containing a colored nano powder and an ultraviolet ray hardening resin is filled in a groove portion of a security image pattern 260 formed on a third ultraviolet curable resin 25, Alternatively, the optical layer having a refractive index difference of a predetermined or larger value is further coated, or the reflective layer coating (Step S116) is used to visualize the security image. The security image pattern 260 is visually observed through the lenticular lens formed on the bottom surface of the transparent substrate, and it is the thickness of the substrate 20 and the third ultraviolet-curing resin 25 that actually determines the thickness of the product.

The multilayer printing is possible by further coating the fourth ultraviolet curing resin 28 on the security image pattern 260, forming the security image pattern 290, and filling the printing material 29. Since the fourth ultraviolet curable resin 28 is less than 20 microns and may be located within the depth of focus range, a color implementation is possible since the secure image pattern 260 and the secure image pattern 290 are shown to be located at the same focal point.

9 is a view for explaining a pressure roll applicable to coating an ultraviolet curable resin in the production method according to the present invention and its adjustable coating conditions. In the present invention, the thickness of the third ultraviolet curing resin 25 may be about 60 to 70 microns and the fourth ultraviolet curing resin 28 may be about 20 microns or less. As shown in FIG. 9, (P) / rotation speed (V) of the pressure roll and the viscosity (V) of the ultraviolet curable resin can be appropriately adjusted.

FIG. 10 is a cross-sectional view for explaining the action and effect of the embodiment in which the destructive layer is provided and the surface substrate is removed by the release layer separation. Referring to FIG. 10, a release layer is formed on a surface substrate as described with reference to FIG. 8 to form lens layers and a composite layer on a surface substrate in subsequent processes, and finally, a surface substrate is removed It is possible.

In the case of the prior art, since the base material is mass-produced in the form of a base film, the refractive index can not be freely selected, and the thickness of the base film is considerably limited. As a result, as a result, in the prior art, the thickness of the entire label becomes relatively thick so that attachment using the auto labeler is not possible.

However, in the method of manufacturing a security image film based on a lenticular lens having a micron unit thickness according to the present invention, the layer corresponding to the focal length layer is formed in the formation of the first lens layer and the second lens layer And a composite layer serving also as a third lens layer and a focal length layer are laminated on the basis of the same UV molding. It should be noted that the base film type substrate is not used by laminating and forming the composite layer serving as the third lens layer and the focal length layer at this time. Since the composite layer serving as the focal length layer is made of the same ultraviolet curing resin as the third lens layer and the security image pattern layer, the optical characteristics such as the refractive index are the same, so that a clear image can be obtained without unnecessary optical loss.

In the manufacturing method according to the present invention, the thickness of the transparent substrate can be freely selected within the range of 3 to 30 microns. For example, in the case of removing the surface substrate including the release layer, it is possible to freely select from 3 to 30 microns, and in the case where the surface substrate is not removed, it is possible to use a surface substrate having a thickness as thin as 3 microns.

In addition, according to the present invention, it is possible to relatively easily select the refractive index of the ultraviolet curable resin, thereby making it possible to freely design the focal distance layer and to reduce the thickness of the focal distance layer. As a result, By weight. Particularly in the case of having a release layer, it is possible to remove the surface layers for supporting the lens layers and the focal length layer to be formed and to make it thinner, for example, less than 50 microns.

If the refractive index difference between the first ultraviolet curing resin 21 / the second ultraviolet curing resin 23 and the third ultraviolet curing resin 25 is less than 0.125, the difference in refractive index is insignificant, The image is excessively enlarged due to excessive lens action, and the sharpness is deteriorated. Therefore, the refractive index difference between the first ultraviolet curable resin 21 / the second ultraviolet curable resin 23 and the third ultraviolet curable resin 25 is preferably set to 0.125 to 0.3.

Also, in this embodiment, as described with reference to FIG. 8, a destructive layer 242 is provided between the lens layer and the security image pattern layer. The breakage layer 242 preferably forms the breakage layer 242 by coating the transparent silicone preferably between step S112 and step S114 by applying and hardening the third ultraviolet curable resin 25, Is performed twice and formed therebetween. Since the breakage layer 242 is made of, for example, transparent silicon, the security image pattern is displayed. However, the breakage layer 242 is not so badly influenced, but it is more preferable to partially form the image because the breakage layer 242 may adversely affect an optically clear image.

8, a release layer 202 is provided on the surface substrate 20 in this embodiment. In the case where the release layer is applied, the surface substrate 20 serves to support the first lens layer, the second lens layer, the third lens layer, and the multiple layer, which are stacked thereon, S120), the surface material 20 can be separated and removed (step S122), so that the thickness of the product label after removing the surface material can be reduced to less than 90 microns. Therefore, the manufacturing method according to the present invention can manufacture a product label having a secure image pattern with a thickness small enough to be automatically attached to a target product by using an automatic label attaching apparatus.

FIG. 11 is a cross-sectional view for explaining the operation effect of the fracture layer formed by the step S113 in the flow chart of FIG. Referring to FIG. 11, when attempting to separate the security image film according to the invention from the product, for example, by immersion in chemicals or hot water, the lens layer and the security image pattern layer are separated by the destructive layer 242 and very thin The lens layer is easily and irreversibly destroyed, thereby completely losing its function as a security image pattern film.

As described above, when a substrate in the form of a base film is used as the focal length layer as in the prior art, not only the thickness of the security image film but also the refractive index and thickness of the base material Since the refractive index and thickness of the layer must be determined, the limitations of the manufacturing process are significant, various patterns can not be freely manufactured, and the security image pattern is not clearly displayed. However, according to the present invention, it is possible to freely select the refractive index of the ultraviolet curing resin of each layer in the optical film having a multilayer structure composed of the composite layer of the first lens layer, the second lens layer and the third lens layer-focal length layer, It is possible to manufacture a security image pattern film having a depth of focus (hereinafter, referred to as " second image hardening resin "). For example, when the refractive indexes of the first and third ultraviolet curing resins 21 and 25 are designed to be larger than that of the second ultraviolet curable resin 21, It is possible to represent a three-dimensional secure image even with a relatively thin thickness, and the secure image is expressed in a remarkably clear relative to that produced by the prior art.

In addition, in the case of the prior art using a substrate in the form of a base film, the security image pattern layer must be formed on the other side of the substrate after the lens layer is formed on one side of the substrate. It is also difficult to obtain a clear pattern. However, the method of manufacturing a security image film based on a lenticular lens having a micron unit thickness according to the present invention is performed by sequentially laminating on one surface of a surface substrate. Therefore, there is no need to reverse the intermediate process product, so that the yield is higher than that of the conventional process, and a clearer pattern can be obtained.

In addition, according to the present invention, in particular, in the case of applying the release layer, the surface substrate serves only to support the first lens layer, the second lens layer, the third lens layer and the composite layer stacked thereon, Since the surface substrate can be separated and removed, a significantly thinner security image pattern label can be produced and can be formed to a thickness thin enough to be attached to a target product using an auto labeling apparatus.

20: substrate
202:
21: first ultraviolet curable resin 22: first mold
220: first lenticular lens pattern
23: Second ultraviolet curable resin
24: second mold
240: second lenticular lens pattern 242: breaking layer
25: Third ultraviolet curing resin
26: Third mold
260: Secure Image Pattern
27, 29: printing material 28: fourth ultraviolet curing resin
290: reflective layer 292: adhesive layer

Claims (6)

(a) applying a liquid first curable resin (21) onto a substrate (20);
(b) The patterned surface of the first mold 22 on which the first lenticular lens pattern 220 is formed is placed on the first ultraviolet curing resin 21 applied in the step (a) Transferring the first lenticular lens pattern 220 onto the upper surface of the first ultraviolet curable resin 21;
(c) applying the second ultraviolet curing resin 23 onto the first ultraviolet curable resin 21 to which the first lenticular lens pattern 220 is transferred and cured according to the step (b);
(d) The pattern surface of the second mold 24 on which the second lenticular lens pattern 240 is formed is placed on the second ultraviolet cured resin 23 applied in the step (c) Transferring the second lenticular lens pattern 240 onto the upper surface of the second ultraviolet curing resin 23;
(e) applying the third ultraviolet curing resin 25 onto the second ultraviolet curable resin 23 to which the second lenticular lens pattern 240 is transferred and cured by the step (d);
(f) transferring the pattern surface of the third mold 26 on which the security image pattern 260 is formed to the upper surface of the third ultraviolet curable resin 25 applied by the step (e); And
(g) In order to make the security image pattern visible, the printing material 27 containing the colored nano powder and the ultraviolet curing resin is filled in the groove portion of the security image pattern 260 formed on the third ultraviolet curable resin 25 Coating a reflective layer on the whole of the security image pattern 260 formed on the third ultraviolet curing resin 25 or coating a material having a difference in refractive index of a certain degree or more,
Between the steps (e) and (f)
(e ') applying and curing the third ultraviolet curable resin 25 twice and forming a destructive layer 242 by partially coating the transparent silicone between the lens layer and the security image pattern layer; Further comprising the steps of: (a) forming a lenticular lens having a thickness of 1 micron; The method according to claim 1,
A method for manufacturing a security image film based on a lenticular lens having a micron unit thickness, characterized in that the refractive indexes of the first ultraviolet curing resin (21) and the third ultraviolet curing resin (25) are larger than the refractive index of the second ultraviolet curing resin . 3. The method of claim 2,
Wherein the difference between the refractive index of the first ultraviolet curable resin (21) and the third ultraviolet curable resin (25) and the refractive index difference of the second ultraviolet curable resin (23) is 0.125-0.3. The lenticular lens- Method of manufacturing image film. The method according to claim 1,
Before the step (a)
(a-1) forming a release layer on the substrate 20,
Wherein the step (a) is a step of applying a liquid first UV-curable resin (21) on the release layer. The method according to claim 1,
After the step (g)
(g ') forming an additional pattern layer on the pattern layer formed by the step (g). < Desc / Clms Page number 20 > delete

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