CN110596796A - Polymer film for imaging and method of making the same - Google Patents
Polymer film for imaging and method of making the same Download PDFInfo
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- CN110596796A CN110596796A CN201910708092.1A CN201910708092A CN110596796A CN 110596796 A CN110596796 A CN 110596796A CN 201910708092 A CN201910708092 A CN 201910708092A CN 110596796 A CN110596796 A CN 110596796A
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Abstract
The embodiment of the application discloses a polymer film for imaging and a preparation method thereof. The polymer film comprises: a layer of polymer having first and second opposed surfaces, the polymer being a thermally and/or photo-curable resin. The first surface is provided with a micro-lens structure; the second surface is provided with an accommodating structure, the accommodating structure is a plurality of grooves, the grooves are used for filling fillers to form an image-text structure, and the color of the fillers is different from that of the polymer; filling filler into the image-text structure to form a pattern, wherein the pattern at least consists of one groove; wherein the image-text structure is located near the focal plane of the microlens structure, through which it is imaged. The polymer film is thinner, is easy to cut off during hot stamping and is beneficial to transfer printing.
Description
The present invention is a divisional application entitled [ polymer film for image formation and method for producing the same ] of invention patent No. 201510397220.7 filed by the applicant on year 2015, 07, 08.
Technical Field
The present application relates to the field of dynamic visual effect film technology, and more particularly to a transferable polymeric film for imaging and a method of making the same.
Background
Moir technology is an attractive new type of visual security technology. The method utilizes the focusing effect of the micro-lens array to amplify the micro-pattern with high efficiency, and realizes the pattern with certain depth of field and peculiar dynamic effect.
The prior art microlens-bearing film includes a substrate, microlenses, and a raised pattern layer. Such films first contain a substrate resulting in an increased thickness and either the patterned layer is exposed or a protective layer is required.
Patent document 200480040733.2 discloses a microlens array security element for application to security threads for windowing of documents of value such as banknotes. The basic structure of the liquid crystal display device is that a periodic micro-lens array is arranged on the upper surface of a transparent base layer, a corresponding periodic micro-pattern array is arranged on the lower surface of the transparent base layer, the micro-pattern array is located on or near the focal plane of the micro-lens array, the micro-pattern array and the micro-lens array are arranged approximately same, and the micro-lens array has the Moire magnification effect on the micro-pattern array.
This patent discloses two methods of making micropatterns: a printing method selected from the group consisting of inkjet, laser, letterpress, offset, gravure, and gravure printing methods, wherein a protruding micropattern ink is provided on the lower surface of the transparent base layer; or forming a concave with a pattern on the lower surface of the transparent base layer, and filling ink in the concave to form a micro-pattern. The latter has the advantage of almost infinite spatial resolution. Therefore, the micro lens and the concave micro pattern which are respectively arranged on the upper surface and the lower surface of the transparent base layer have optimal graph complexity and resolution, and the imitation difficulty of the safety device is improved to the maximum extent.
However, the current methods of use of such security elements are primarily integral embedding in the paper or bonding to the surface of the printed matter. Hot stamping is a mainstream method for arranging local security elements on product packages at present. However, the stamping technique requires that the security element be a thin and severable film.
The current industry minimum transparent substrate thickness for practical processing feasibility is 23um, and the thickness of the integrated security element is typically increased to over 100um, in addition to the thickness of the micro-lenses and recessed structures. Therefore, the thick integral structure is extremely not beneficial to timely cutting off during high-speed hot stamping. In addition, transparent substrates often have good mechanical properties, which also do not facilitate the cutting requirements of hot stamping.
In order to adapt the security element to the prevailing stamping method, the transparent substrate in the security element must be removed. Patent document 200480040733.2 discloses in fig. 13-14 an example of a tamper indicating material. That is, when the peelable layer covering the surface of the microlens is peeled off, the effect of enlarging the micropattern changes before and after the peeling. It is worth mentioning that: referring to fig. 14, for the "peeling change" film structure, the structure includes a peelable microlens, a second microlens, a first pattern layer and a second pattern layer, the first pattern layer can be directly printed on the back of the second microlens, an optical spacer 244 is further disposed between the first pattern layer and the second pattern layer, and the transparent substrate is excluded between the second microlens and the first pattern layer, but the second microlens cannot display the image of the first pattern layer (see page 20, second paragraph). Furthermore, pages 29 to 30 of the patent specification disclose a method for preparing the structure in the patent, which basically comprises the following steps: s01 one or more optical spacers; the S02 microlens and the pattern layer are respectively arranged on the surface of the optical spacer. Wherein the surface of the optical spacer is provided with a curable resin to prepare a micro lens and a pattern layer.
Therefore, in both the structure of fig. 13 and 14 and the manufacturing method disclosed on page 29-30 of the specification, the optical spacer layer is required to be disposed for displaying images of the micro-lenses and the pattern layer, and the manufacturing method is to coat the surface of the optical spacer with the curable resin to prepare the micro-lenses and the pattern layer; however, the structure causes that the thick integral structure is extremely not beneficial to cutting off in time when in high-speed hot stamping. In addition, transparent substrates often have good mechanical properties, which also do not facilitate the cutting requirements of hot stamping.
Therefore, there is a need for new solutions to make a thinner severable transferable moir imaging element with both microlenses and recessed micropatterns.
Disclosure of Invention
It is an object of embodiments of the present application to provide a polymer film for imaging and a method of making the same to achieve the objectives of reducing the thickness of the film and providing a transferable imaged document.
To solve the above technical problem, embodiments of the present application provide a polymer film for imaging, which is implemented by:
embodiments provide a polymer film for imaging, including:
a layer of polymer having first and second opposed surfaces, the polymer being a thermally and/or photo-curable resin;
the first surface is provided with a micro-lens structure;
the second surface is provided with an accommodating structure, the accommodating structure is a plurality of grooves, the grooves are used for filling fillers to form an image-text structure, and the color of the fillers is different from that of the polymer; filling filler into the image-text structure to form a pattern, wherein the pattern at least consists of one groove;
wherein the image-text structure is located near the focal plane of the microlens structure, through which it is imaged.
The distance between the top of the micro-lens structure and the top of the containing structure is 2-150 micrometers.
The image-text structure is embedded in the micro-lens structure.
The filler includes a coloring material, a dyeing material, a metallic material, or a conductive material.
A reflective structure is disposed on a surface of the microlens structure.
The patterns are graphs, grids, characters, numbers, symbols, scenic pictures and/or logos.
And a protection structure is arranged on the surface of the image-text structure.
The embodiment of the present application also provides a method for preparing a polymer film for imaging, which includes:
obtaining UV glue in a colloid state at normal temperature and normal pressure;
extruding two sides of the UV glue by using a pressing device, wherein the pressing device can comprise a first roller and a second roller which are parallel and have a preset spacing distance, a first mold with a micro-lens pattern is arranged on the outer periphery of the first roller, and a second mold with a preset accommodating structure pattern is arranged on the outer periphery of the second roller;
heating the first roller and the second roller simultaneously, or heating the first roller or the second roller, and curing to form a micro-lens mechanism and a containing structure;
and filling a filler in the accommodating structure to form an image-text structure, wherein the color of the filler is different from that of the UV glue.
The first roller and the second roller are relatively vertically disposed, or the first roller and the second roller are relatively horizontally disposed.
The first roller and the second roller are oppositely arranged, or the first roller and the second roller are oppositely and obliquely arranged.
As can be seen from the above technical solutions provided in the embodiments of the present application, the polymer film in the embodiments of the present application includes a first surface and a second surface that are oppositely disposed; the first surface is provided with a micro-lens structure; the second surface is formed with a containing structure, and the containing structure is used for forming a graphic and text structure imaged by the micro-lens structure; the micro-lens structure and the containing structure are integrated, but no substrate layer is arranged, so that the aims of reducing the thickness of the film and transferring can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic structural diagram of a polymer film without a pattern structure according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a polymer film for forming a graphic structure according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of another polymer film provided in the examples of the present application.
Fig. 4 is a schematic structural diagram of another polymer film provided in the examples of the present application.
Fig. 5 is a schematic structural diagram of another polymer film without a pattern structure according to an embodiment of the present disclosure.
Fig. 6 is a schematic structural diagram of another polymer film for forming a graphic structure according to an embodiment of the present disclosure.
Fig. 7 is a schematic structural diagram of another polymer film (provided with a reflective structure) without forming a graphic structure according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of another polymer film (provided with a reflective structure) for forming a graphic structure according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of another polymer film (provided with a reflective structure) without forming a graphic structure according to an embodiment of the present application.
Fig. 10 is a schematic structural diagram of another polymer film (provided with a reflective structure) for forming a graphic structure according to an embodiment of the present application.
Fig. 11 is a flowchart of a method for manufacturing a polymer film according to an embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When two elements are referred to as being "integral" it is understood that the two elements are integral and inseparable. "integrally formed" may mean that the two elements are not separately manufactured, but rather are directly formed by machining the entire body. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
A polymer film provided by an embodiment of the present application will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, embodiments of the present disclosure provide a polymer film 20 that can include a polymer having first and second oppositely disposed surfaces. A micro-lens structure 201 is formed on the first surface; on said second surface a receiving structure 202 is formed, which receiving structure 202 is used to form a teletext structure 203 imaged by the microlens structure 201, as shown in fig. 2.
The single polymer may be a single polymer or a mixed polymer of a plurality of non-reactive single polymers. The polymer may have a light transmittance of greater than 70%, i.e., the polymer is a transparent color or visually appears transparent. The polymer may be a thermally and/or photo curable resin, such as a UV glue. The microlens structure 201 and the accommodating structure 202 may be respectively located on the first surface and the second surface opposite to each other in a polymer layer made of the polymer, and in this case, the polymer in the polymer layer may be uniformly distributed or may not be uniformly distributed. Since the microlens structure 201 and the receiving structure 202 are formed in the same polymer layer, there is no interface between the microlens structure 201 and the receiving structure 202, i.e., the microlens structure 201 and the receiving structure 202 are an integral structure.
The microlens structure 201 may contain a microlens array, which may contain one or more microlenses. There may be no gaps between the plurality of microlenses so as to reduce the overall volume of the polymer film; gaps may also exist between the plurality of microlenses (as shown in fig. 3) so that the integrity of the cut microlenses can be ensured when the polymer film is cut, and thus the subsequent imaging effect of the microlenses can be ensured.
The receiving structure 202 may contain one or more grooves, or may contain one or more micro-grooves (i.e., grooves on the micrometer scale). The (micro) trenches are used to fill with a filler to form the teletext structure 203.
The pattern structure 203 contains a pattern formed by filling the filler. The filler may be a material having a refractive index difference with respect to light from the polymer, and includes a coloring material, a dyeing material, a metal material, a conductive material, or the like, such as ink. It should be noted that the color of the filler may be different from the color of the polymer, so that when one views the image of the graphic structure, one can clearly distinguish the pattern in the graphic structure.
The pattern may be one pattern or micropattern or a plurality of the same or different patterns or micropatterns (i.e. patterns on the micron scale), such as a graphic, grid, text, number, symbol, landscape and/or Logo-like pattern of readily discernable shape. The different (micro) patterns may be of different sizes; or the shape of the (micro) pattern may be different; it is also possible that the (micro) patterns are different in their composition, e.g. the first (micro) pattern is the company name and the second (micro) pattern is the company Logo.
The receiving structure 202 (or the graphic structure 203) may be disposed to match with the microlens structure 201, and specifically, the receiving structure 202 (or the graphic structure 203) may be disposed to match with the position of the microlens structure 201, for example, the micro pattern in the graphic structure 202 is disposed to face the microlens in the microlens structure 201, so as to improve the utilization rate of the polymer material. The accommodating structure 202 (or the graphic structure 203) and the micro lens structure 201 may be arranged in a matching manner, and the micro lenses in the micro lens structure 201 and the micro grooves in the accommodating structure (or the micro patterns in the graphic structure 203) may also be arranged in a one-to-one correspondence manner, which is beneficial to ensure that each imaging film unit cut by the cutting process contains at least one complete micro lens and micro groove (or micro pattern).
The image-text structure 203 may be located near the focal plane of the lenticular structure 201, which may be imaged through the lenticular structure 201, and a magnified image of the image-text structure 203 may be observed on the side of the lenticular structure 201 opposite the image-text structure 203. Specifically, each micro pattern in the image-text structure 203 is located near a corresponding focal plane in the microlens structure 201, each micro pattern can be imaged through a corresponding microlens, and a magnified image of the corresponding micro pattern can be observed on the other side of each microlens. The focal plane may represent the plane passing through the focal point of the microlens and perpendicular to the primary optical axis of the microlens array.
The distance between the top of the microlens structure 201 and the top of the receiving structure 202 (or the graphic structure 203) may be 2 to 150 micrometers. When the distance between the lenticular structure and the image-text structure is small, it can be understood that the image-text structure is embedded in the lenticular structure, as shown in fig. 4. It can be seen from fig. 4 that the image-text structure 503 is embedded in the microlens structure 501. The smaller the distance between the micro-lens structure and the image-text structure is, the thinner the thickness of the polymer film is, which not only can save cost, but also is easier to cut off during hot stamping.
In another embodiment, the surface of the graphic structure may be provided with a protective structure. The protection pair structure is used for protecting the image-text structure so as to prevent (micro) pattern deformation in the image-text structure or (micro) pattern damage from the outside world and influence imaging effect.
As can be seen from the above description, the polymer film provided in the embodiments of the present application may be a one-layer film structure, and the microlens structure and the accommodating structure are formed in the same polymer layer (i.e., an integral structure), and there is no substrate layer, which achieves the purpose of reducing the thickness of the polymer film. Furthermore, the polymer film has no substrate layer and thus has poor mechanical properties, which makes it easy to cut the polymer film when it is hot stamped.
The polymer film in the embodiment of the application has thin thickness which can reach less than tens of micrometers, even can reach several micrometers, and is easy to cut, so that the polymer film is easy to transfer, and the weight and the cost can be reduced.
Another polymer film 60 is provided in the present embodiment, as shown in fig. 5. The polymer film 60 can include a first polymer having a first surface and a second polymer having a second surface, the first and second surfaces being opposite; the first surface is formed with a microlens structure 601; the second surface is formed with receiving structures 602 for forming a graphic structure 603 imaged by the lenticular structure 601, as shown in fig. 6.
The first polymer and the second polymer may be both a single polymer or a mixed polymer composed of a plurality of individual polymers that do not react. The light transmittance of the first polymer and the second polymer may each be greater than 70%, i.e., the first polymer and the second polymer are transparent colors or visually appear transparent. The first polymer and the second polymer may each be a resin material, including a thermally and/or photo-curable resin, such as a UV glue. The difference in refractive index between the first polymer and the second polymer may be less than 0.5 to ensure that the effect of a person viewing the image in the imaged film is not compromised.
The adjacent portions between the first polymer and the second polymer are formed with fused portions. The adjacent portion may be a contact portion between the first polymer and the second polymer when the first polymer and the second polymer are extruded using a die to form a preliminary microlens structure and a preliminary accommodating structure. The fused portion may be a region where the first polymer and the second polymer are fused in a predetermined ratio. The preset ratio may be N: M, where N and M are the contents of the first polymer and the second polymer at the junction of the adjacent portions of the microlens structure 601 and the accommodating structure 602, respectively, and the values of both of them may be 0 to 100%, but not 0 and 100%. Note that the content of the first polymer in the microlens structure 601 is 100%; the containment structure 602 has a content of the second polymer of 100%. Thus, the microlens structure 601 and the receiving structure 202 can be considered as a unitary structure, and there is no interface between the microlens structure and the receiving structure, or there is no distinct layer-to-layer boundary or a regular, ordered boundary in the cross-section of the polymer film.
The embodiment of the present application provides a polymer film 60 that differs from the polymer film 20 shown in fig. 1 in that the polymer film 60 is composed of two polymers and the polymer film 20 is composed of one polymer. The description of the polymer film 60 can be referred to the description of the polymer film 20 in the above embodiment, and will not be described redundantly.
As can be seen from the above description, the polymer film provided in the embodiments of the present application may be regarded as a one-layer film structure although it includes two polymers, and the micro-lens structure and the accommodating structure are respectively formed on the first surface of the first polymer and the second surface of the second polymer, but a fused portion is formed between the two polymers, so that the micro-lens structure and the accommodating structure may be regarded as a unitary structure. And the polymer film provided by the embodiment of the application also has no base material layer, so that the aim of reducing the thickness of the polymer film can be fulfilled. Furthermore, the polymer film has poor mechanical properties due to the absence of a substrate layer, which makes it easy to cut the polymer film when it is hot stamped.
The polymer film in the embodiment of the application has thin thickness which can reach less than tens of micrometers, even can reach several micrometers, and is easy to cut, so that the polymer film is easy to transfer, and the weight and the cost can be reduced.
As shown in fig. 7, another polymer film 80 is provided in the examples herein, which can include a polymer having a first surface and a second surface disposed opposite each other. A microlens structure 801 is formed on the first surface; a reflective structure 804 is provided on the surface of the microlens structure 801; on said second surface a receiving structure 802 is formed, which receiving structure 802 is used to form a teletext structure 803 imaged by the microlens structure 801, as shown in fig. 8.
The single polymer may be a single polymer or a mixed polymer of a plurality of non-reactive single polymers. The polymer may have a light transmittance of greater than 70%, i.e., the polymer is a transparent color or visually appears transparent. The polymer may be a thermally and/or photo curable resin, such as a UV glue. The microlens structure 801 and the receiving structure 802 may be disposed on first and second opposite surfaces of a polymer layer made of the polymer, respectively, and the polymer in the polymer layer may be uniformly distributed or non-uniformly distributed. Since the microlens structure 801 and the receiving structure 802 are formed in the same polymer layer, there is no interface between the microlens structure 801 and the receiving structure 802, i.e., the microlens structure 801 and the receiving structure 802 are an integral structure.
Microlens structure 801 may contain a microlens array, which may contain one or more microlenses. There may be no gaps between the plurality of microlenses so as to reduce the overall volume of the polymer film; gaps can also exist among the plurality of micro lenses, so that the integrity of the cut micro lenses can be ensured when the polymer film is cut, and the subsequent imaging effect of the micro lenses can be ensured.
The receiving structure 802 may contain one or more grooves, or may contain one or more micro-grooves (i.e., grooves on the micron scale). The (micro) trenches are used to fill with a filler to form the teletext structure 803.
The image-text structure 803 contains a pattern formed by filling the filler. The filler may be a material having a refractive index difference with respect to light from the polymer, and includes a coloring material, a dyeing material, a metal material, a conductive material, or the like, such as ink. It should be noted that the color of the filler may be different from the color of the polymer, so that when one views the image of the graphic structure, one can clearly distinguish the pattern in the graphic structure.
The pattern may be one pattern or micropattern or a plurality of the same or different patterns or micropatterns (i.e. patterns on the micron scale), such as a graphic, grid, text, number, symbol, landscape and/or Logo-like pattern of readily discernable shape. The different (micro) patterns may be of different sizes; or the shape of the (micro) pattern may be different; it is also possible that the (micro) patterns are different in their composition, e.g. the first (micro) pattern is the company name and the second (micro) pattern is the company Logo.
The receiving structure 802 (or the image-text structure 803) may be disposed to match with the microlens structure 801, and specifically, the receiving structure 802 (or the image-text structure 803) may be disposed to match with the position of the microlens structure 801, for example, the micropattern in the image-text structure 803 is disposed to face the microlens in the microlens structure 801, so as to improve the utilization rate of the polymer material. The accommodating structure 802 (or the image-text structure 803) and the micro-lens structure 801 may be arranged in a matching manner, and the micro-lenses in the micro-lens structure 801 and the micro-grooves in the accommodating structure (or the micro-patterns in the image-text structure 803) may also be arranged in a one-to-one correspondence manner, which is beneficial to ensure that each imaging film unit cut by the cutting method contains at least one complete micro-lens and micro-groove (or micro-pattern).
The image-text structure 803 may be located near the focal plane of the lenticular structure 801, which may be imaged by the lenticular structure 801, and a magnified image of the image-text structure 803 may be observed on the side of the image-text structure 803 under the influence of the reflective structure 804. Specifically, each micro pattern in the image-text structure 803 may be located near a corresponding focal plane in the micro lens structure 801, each micro pattern may be imaged by a corresponding micro lens, and a magnified image of the corresponding micro pattern may be observed on the side where the image-text structure 803 is located.
The distance between the top of the microlens structure 801 and the top of the receiving structure 802 (or the image-text structure 803) may be 2 to 150 micrometers. When the distance between the lenticular structure and the image-text structure is small, it can be understood that the image-text structure is embedded in the lenticular structure. The smaller the distance between the micro-lens structure and the image-text structure is, the thinner the thickness of the polymer film is, which not only can save cost, but also is easier to cut off during hot stamping.
The reflective structure 804 may be a transparent material, an opaque material, or a semi-transparent material. The thickness of the reflective structure 804 may be 0.02 to 5 μm.
As can be seen from the above description, the polymer film provided in the embodiments of the present application may be a one-layer film structure, and the microlens structure and the accommodating structure are formed in the same polymer layer (i.e., an integral structure), and there is no substrate layer, which achieves the purpose of reducing the thickness of the polymer film. Furthermore, the polymer film has no substrate layer and thus has poor mechanical properties, which makes it easy to cut the polymer film when it is hot stamped. In addition, the reflection structure is arranged on the surface of the micro-lens structure, so that the image-text structure side of the polymer film can be attached to an actual application product in actual application, and the image of the image-text structure is observed from the image-text structure side, so that the problem that the user experience effect is influenced due to the fact that the concave and convex of the side where the micro-lens structure is located are uneven when the image of the image-text structure is observed from the micro-lens side can be avoided, and the improvement of the user experience is facilitated.
The polymer film in the embodiment of the application has a thin thickness which can be less than tens of micrometers, even can be several micrometers, and is easy to cut, so that the polymer film is easy to transfer.
The present embodiment also provides another polymer film 100, as shown in fig. 9. Polymer film 100 can include a first polymer having a first surface and a second polymer having a second surface, the first surface and the second surface opposing each other; the first surface is formed with a microlens structure 1001; a reflective structure 1004 is provided on the surface of the microlens structure 1001 opposite the containment structure; the second surface is formed with a receiving structure 1002 for forming a teletext structure 1003 imaged by the microlens structure 1001, as shown in fig. 10.
The first polymer and the second polymer may be both a single polymer or a mixed polymer composed of a plurality of individual polymers that do not react. The light transmittance of the first polymer and the second polymer may each be greater than 70%, i.e., the first polymer and the second polymer are transparent colors or visually appear transparent. The first polymer and the second polymer may each be a resin material, including a thermally and/or photo-curable resin, such as a UV glue. The difference in refractive index between the first polymer and the second polymer may be less than 0.5 to ensure that the effect of a person viewing the image in the imaged film is not compromised.
The adjacent portions between the first polymer and the second polymer are formed with fused portions. The adjacent portion may be a contact portion between the first polymer and the second polymer when the first polymer and the second polymer are extruded using a die to form a preliminary microlens structure and a preliminary accommodating structure. The fused portion may be a region where the first polymer and the second polymer are fused in a predetermined ratio. The preset ratio may be N: M, where N and M are the contents of the first polymer and the second polymer at the junction of the adjacent portions of the microlens structure 601 and the accommodating structure 602, respectively, and the values of both of them may be 0 to 100%, but not 0 and 100%. Note that the content of the first polymer in the microlens structure 1001 is 100%; the content of the second polymer in the containment structure 1002 is 100%. Thus, the microlens structure 1001 and the receiving structure 1002 can be considered as a unitary structure, and there is no interface between the microlens structure and the receiving structure, or there is no distinct layer-to-layer boundary or a regular and orderly boundary in the cross-section of the polymer film.
The present embodiment provides a polymer film 100 that differs from the polymer film 80 shown in fig. 7 in that the polymer film 100 is composed of two polymers, and the polymer film 80 is composed of one polymer. The specific description of the polymer film 100 can be referred to the description of the polymer film 80 in the above embodiments, and will not be described redundantly.
As can be seen from the above description, the polymer film provided in the embodiments of the present application may be regarded as a one-layer film structure although it includes two polymers, and the micro-lens structure and the accommodating structure are respectively formed on the first surface of the first polymer and the second surface of the second polymer, but a fused portion is formed between the two polymers, so that the micro-lens structure and the accommodating structure may be regarded as a unitary structure. And the polymer film provided by the embodiment of the application also has no base material layer, so that the aim of reducing the thickness of the polymer film can be fulfilled. Furthermore, the polymer film has poor mechanical properties due to the absence of a substrate layer, which makes it easy to cut the polymer film when it is hot stamped. In addition, the reflection structure is arranged on the surface of the micro-lens structure, so that the image-text structure side of the polymer film can be attached to an actual application product in actual application, and the image of the image-text structure is observed from the image-text structure side, so that the problem that the user experience effect is influenced due to the fact that the concave and convex of the side where the micro-lens structure is located are uneven when the image of the image-text structure is observed from the micro-lens side can be avoided, and the improvement of the user experience is facilitated.
The polymer film in the embodiment of the application has a thin thickness which can be less than tens of micrometers, even can be several micrometers, and is easy to cut, so that the polymer film is easy to transfer.
The embodiment of the application also provides a preparation method of the polymer film, which is shown in fig. 11. The method comprises the following steps:
s1: the polymer in a colloidal state at normal temperature and normal pressure is obtained.
The polymer may be one polymer or two polymers. Each polymer may be a single polymer, such as a curable resin or UV glue, or a mixed polymer of a plurality of polymers that do not react with each other.
The polymers can be obtained by methods known in the art and are not described in detail here.
S2: extruding a first side of the polymer using a first die having a microlens pattern and a second side of the polymer using a second die having a preset containment structure pattern to form a microlens primary structure and a containment primary structure as a unitary structure; wherein the first side and the second side are opposite.
After obtaining the polymer, extruding a first side of the polymer using a first die having a microlens pattern to form a microlens preliminary structure, and extruding a second side of the polymer using a second die having a predetermined containment structure pattern to form a containment preliminary structure. The preliminary microlens structure and the preliminary accommodating structure form an integral structure in the course of extrusion. The microlens structure may be a microlens array containing one or more microlenses. The containment preliminary structure may contain one or more microchannels.
The extruding the first side of the polymer using the first mold having the microlens pattern to form the microlens preliminary structure, and extruding the second side of the polymer using the second mold having the preset accommodating structure pattern, and the forming the accommodating preliminary structure may be extruding the first side and the second side of the polymer using both the first mold having the microlens pattern and the second mold having the preset accommodating structure pattern to form the microlens preliminary structure and the accommodating preliminary structure; or a first mold with a micro-lens pattern is firstly used for extruding a first side of the polymer to form a micro-lens preliminary structure, and then a second side of the polymer is extruded to form a containing preliminary structure by using a second mold with a preset containing structure pattern within a first preset time interval; it is also possible to first extrude the second side of the polymer using a second die having a predetermined pattern of containment features to form a containment preform structure and then extrude the first side of the polymer using a first die having a pattern of microlenses to form a microlens preform structure within a first predetermined time interval. The first preset time interval can be set according to actual operation conditions.
When the polymer is a single polymer, the first and second sides of the single polymer can be extruded simultaneously by the first and second dies, or the first and second sides of the single polymer can be extruded within a first preset time interval to form a primary microlens structure and a primary accommodating structure; when the polymers are two polymers, such as a first polymer and a second polymer, a first side of the first polymer may be extruded by the first die, and a second side of the second polymer may be extruded by the second die at the same time or within a first preset time interval, and adjacent portions between the first polymer and the second polymer are contacted during the extrusion to form a fused portion, and the primary microlens structure and the primary accommodating structure are formed.
S3: and solidifying the primary microlens structure and the primary accommodating structure to respectively form a microlens structure and an accommodating structure, and obtaining the polymer film.
After the preliminary microlens structure and the preliminary accommodating structure are formed, the preliminary microlens structure and the preliminary accommodating structure can be solidified to form a microlens structure and a accommodating structure respectively. The curing the preliminary microlens structure and the preliminary receiving structure may include simultaneously curing the preliminary microlens structure and the preliminary receiving structure; or the primary microlens structure is firstly cured, and then the primary accommodating structure is cured when the primary microlens structure is not completely cured; it is also possible to first cure the preliminary holding structure and then cure the preliminary microlens structure when the preliminary holding structure is not completely cured.
The curing of the preliminary microlens structure and the preliminary receiving structure may be directly heat curing or light curing of the preliminary microlens structure and the preliminary receiving structure; curing of the microlens preliminary structure and the containment preliminary structure may also be achieved by using an irradiation source or a heat source for the first mold and/or the second mold. For example, when the polymer is UV glue, the primary microlens structure and the primary accommodating structure are cured by irradiation with ultraviolet light to form the microlens structure and the accommodating structure.
In the above embodiments, the adhesion between the first mold and the polymer is greater than the adhesion between the second mold and the polymer, so that the polymer is not separated from the first mold when the second mold is separated, thereby avoiding subsequent influences on the filling material in the trench structure.
As can be seen from the above steps, in the method for preparing a polymer film provided in the embodiments of the present application, the microlens structure and the accommodating structure can be formed at one time and cured at the same time, and a substrate layer does not need to be prepared, so that the thickness of the polymer film can be reduced. In addition, the method has simple process, saves materials, reduces the cost and is suitable for industrial production.
In another embodiment, in order that the polymer film may be used for imaging, the method may further comprise:
s4: filling a filler in the accommodating structure to form a graph-text structure, wherein the refractive index of the filler is different from that of the polymer.
After the polymer film is obtained, the containing structure can be filled with fillers, and the fillers can be subjected to curing measures such as drying or sintering and the like to form an image-text structure. The filler may have a different refractive index than the polymer and may have a different color than the polymer for viewing purposes.
In another embodiment, in order to make the image of the pattern observable on the side of the graphic structure so as to improve the experience effect of the user, the preparation method may further include:
s5: and arranging a reflecting structure on the surface of the micro-lens structure.
After the microlens structure is formed, a reflective structure may be disposed on the surface of the microlens structure by spraying, inkjet printing, suspension coating, evaporation, magnetron sputtering, electroplating, or the like.
In another embodiment, in order to make the prepared film convenient for use, the preparation method may further include:
s6: and cutting the polymer film into film units with preset sizes.
The thin film unit may include at least one microlens and one groove or pattern in its entirety.
It should be noted that the execution order between this step and step S4 is not limited.
The above steps are further described below in connection with the actual preparation method.
In a particular process for preparing the film, the opposing sides of the polymer can be extruded using a lamination device. The pressing device may include a first roller and a second roller which are parallel and have a preset interval distance; the first mold is provided on the outer circumferential surface of the first roller, and the second mold is provided on the outer circumferential surface of the second roller. The first roller and the second roller may be disposed vertically or horizontally. The first roller and the second roller can be oppositely arranged or can be obliquely oppositely arranged. The first mold and the second mold may be respectively sleeved on the first roller and the second roller, or may be respectively engraved on the first roller and the second roller.
And when the first roller and the second roller are vertically arranged relatively, injecting the polymer between the two rollers, and under the action of gravity and friction force between the two rollers, vertically passing the polymer through the two rollers to form the primary microlens structure and the primary accommodating structure. The two rolls may then be heated simultaneously, or one of the rolls may be heated during or after the formation of the preliminary microlens structure and the containment structure, and cured to form the microlens structure and the containment structure. It should be noted that the predetermined distance between the two rollers can be adjusted according to the predetermined thickness between the lenticular structure and the containing structure, so as to ensure that, when the first surface and the second surface are in different polymers, a fused portion is formed during the rolling extrusion of the rollers, so that no interface exists between the cured lenticular structure and the image-text structure.
In addition, the pressing device can also comprise a cutting tool, and after the polymer film comprising the micro-lens structure and the containing structure is obtained, the polymer film is cut for subsequent use.
When the first roller and the second roller are placed horizontally relatively, thrust can be applied to enable the polymer to horizontally pass through the two rollers to form a micro-lens preliminary structure and an accommodating preliminary structure, the two rollers are heated, the formed micro-lens preliminary structure and the accommodating preliminary structure are solidified simultaneously, and the micro-lens structure and the accommodating structure are formed respectively. The specific implementation of this way can be referred to the specific implementation of the vertical placement of the first and second rollers, which is not described again here in a redundant manner.
It should be noted that although the present application provides the method steps as described in the above embodiments or flowcharts, more or less steps may be included in the method based on the conventional or non-inventive labor. In the case of steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the embodiments of the present application.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail. In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Moreover, the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A polymer film for imaging, comprising:
a layer of polymer having first and second opposed surfaces, the polymer being a thermally and/or photo-curable resin;
the first surface is provided with a micro-lens structure;
the second surface is provided with an accommodating structure, the accommodating structure is a plurality of grooves, the grooves are used for filling fillers to form an image-text structure, and the color of the fillers is different from that of the polymer; filling filler into the image-text structure to form a pattern, wherein the pattern at least consists of one groove;
wherein the image-text structure is located near the focal plane of the microlens structure, through which it is imaged.
2. The polymer film of claim 1, wherein a distance between a top of the microlens structure and a top of the receiving structure is 2 to 150 μm.
3. The polymer film of claim 2, wherein the graphic structure is embedded in the microlens structure.
4. The polymer film according to claim 1, wherein the filler comprises a coloring material, a dyeing material, a metal material, or a conductive material.
5. The polymer film according to claim 1, wherein a reflective structure is provided on a surface of the microlens structure.
6. The polymer film according to claim 1, wherein the pattern is a figure, a grid, a letter, a number, a symbol, a landscape and/or a logo.
7. The polymer film of claim 1, wherein the surface of the graphic structure is provided with a protective structure.
8. A method of making a polymer film for imaging, comprising:
obtaining UV glue in a colloid state at normal temperature and normal pressure;
extruding two sides of the UV glue by using a pressing device, wherein the pressing device can comprise a first roller and a second roller which are parallel and have a preset spacing distance, a first mold with a micro-lens pattern is arranged on the outer periphery of the first roller, and a second mold with a preset accommodating structure pattern is arranged on the outer periphery of the second roller;
heating the first roller and the second roller simultaneously, or heating the first roller or the second roller, and curing to form a micro-lens mechanism and a containing structure;
and filling a filler in the accommodating structure to form an image-text structure, wherein the color of the filler is different from that of the UV glue.
9. The method of claim 8, wherein the first and second rollers are positioned relatively vertically or the first and second rollers are positioned relatively horizontally.
10. The method of claim 8, wherein the first roller and the second roller are disposed in opposition to each other, or the first roller and the second roller are disposed in oblique opposition to each other.
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| CN201910708092.1A CN110596796A (en) | 2015-07-08 | 2015-07-08 | Polymer film for imaging and method of making the same |
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| CN201510397220.7A CN106324725B (en) | 2015-07-08 | 2015-07-08 | Thin polymer film and preparation method thereof for imaging |
| CN201910708092.1A CN110596796A (en) | 2015-07-08 | 2015-07-08 | Polymer film for imaging and method of making the same |
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| US11143794B2 (en) | 2015-07-08 | 2021-10-12 | Shine Optoelectronics (Kunshan) Co., Ltd | Optical film |
| WO2017005206A1 (en) | 2015-07-08 | 2017-01-12 | 昇印光电（昆山）股份有限公司 | Optical film |
| CN109152259A (en) * | 2017-06-27 | 2019-01-04 | 昇印光电（昆山）股份有限公司 | A kind of optical thin film, mold and electronic equipment cover board |
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| CN106324725A (en) | 2017-01-11 |
| CN106324725B (en) | 2019-09-06 |
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