Delayed fluorescent laser anti-counterfeiting transfer paper

Abstract

The utility model belongs to the field of packaging materials, and particularly relates to delayed fluorescent laser anti-counterfeiting transfer paper, which is characterized in that a transfer glue layer, a reflective layer, a first laser mould pressing coating, a plurality of delayed fluorescent pattern layers and a laser holographic layer are sequentially arranged on the surface of single-sided coated paper. And the fluorescence disappearance time of each time-delay fluorescence pattern layer is different. The laser anti-counterfeiting technology and the delayed fluorescent anti-counterfeiting technology are applied to the transfer paper, so that the anti-counterfeiting performance of the transfer paper is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of packaging materials, and particularly relates to a time-delay fluorescent laser anti-fake transfer paper. BACKGROUND

[0002] The laser transfer paper is a commonly used packaging material. It is commonly used as the packaging box and handbag of wine, cigarettes, various cosmetics and medicines, and can improve the grade, artistic effect and anti-fake ability of products. With the increasing requirement of product anti-fake, the laser transfer paper also adopts fluorescent technology. For example, the utility model patent with the name of a durable laser transfer paper and the announcement number CN215561547U was authorized by the China Patent Bureau on January 18, 2022. The laser layer and the protection layer of the utility model patent are provided with a fluorescent layer. The fluorescent layer can enhance the effect of laser color.

[0003] The transfer paper with the above structure only uses the characteristic that the fluorescent layer can emit fluorescence, and has the defect of being easily imitated. UTILITY MODEL CONTENT

[0004] The utility model aims to provide a time-delay fluorescent laser anti-fake transfer paper. The time-delay fluorescent technology is applied to the laser transfer paper, the laser transfer paper is not easily imitated, and the anti-fake performance is improved.

[0005] The utility model is realized through the following technical solutions:

[0006] That is, a time-delay fluorescent laser anti-fake transfer paper is characterized in that the surface of single-side copper plate paper is sequentially provided with a transfer glue layer, a reflective layer, a first laser mold pressing coating layer, a time-delay fluorescent pattern layer and a laser holographic layer. The number of time-delay fluorescent pattern layers is multiple. Part of the time-delay fluorescent pattern layers is covered on the first laser mold pressing coating layer. The fluorescent disappearance time of each time-delay fluorescent pattern layer is different.

[0007] The time-delay fluorescent pattern layer of the utility model is flexographically printed by doping nitrogen and fluorine copolymer fluorescent carbon quantum dots. The material of the nitrogen and fluorine copolymer fluorescent carbon quantum dots is a mature existing fluorescent material.

[0008] The multiple fluorescent pattern layers of the utility model are designed according to different fluorescent disappearance times. The combination and arrangement of different fluorescent disappearance inks are controlled, the pattern information with specific fluorescent effects is designed, and the fluorescent pattern can be text, digital code, scenery, characters, enterprise logo or the superimposed application of multiple information patterns.

[0009] The time-delay fluorescent pattern layer of the utility model can continuously emit light for a period of time after the excitation source stops, and the complexity and non-reproducibility of the pattern are increased.

[0010] The principle of the utility model is as follows:

[0011] The time-delay fluorescent pattern on the transfer paper cannot be observed under natural light, the pattern appears under ultraviolet excitation, and each time-delay fluorescent pattern slowly disappears when the ultraviolet light is turned off, different parts disappear at different times, thereby forming a time-delay fluorescent disappearance code, and the difficulty of counterfeiting is increased due to the time-related physical characteristics.

[0012] The time-delay fluorescent pattern layer and the laser holographic layer of the utility model are printed into a completed pattern by alignment or nesting.

[0013] Further, the two same pattern units are distributed at intervals on the transfer paper, the number and position of the time-delay fluorescent pattern layer of the first unit correspond to the number and position of the time-delay fluorescent pattern layer of the second unit, and the time-delay fluorescent pattern layers of the two units are different in order of fluorescent disappearance.

[0014] The time-delay fluorescent pattern layers of two adjacent units are the same in position but different in order of fluorescent disappearance, thereby increasing the difficulty of counterfeiting.

[0015] Further, the reflective layer is any one of a metal aluminum layer, a metal copper layer, a zinc sulfide layer and an aluminum oxide layer.

[0016] The reflective layer is mainly used for protecting the laser holographic pattern, and the high-brightness feature of the reflective layer can contrast the color printing pattern and the laser pattern, thereby improving the brightness and the color effect of the pattern.

[0017] The utility model has the advantages of reasonable structure and good anti-counterfeiting performance. The utility model applies the laser anti-counterfeiting technology and the time-delay fluorescent anti-counterfeiting technology to the transfer paper, thereby improving the anti-counterfeiting performance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the utility model embodiment 1.

[0019] Figure 2 It is a layer structure schematic view of one unit of the utility model.

[0020] As shown in the figure: 1. single copper plate paper; 2. transfer glue layer; 3. reflective layer; 4. first laser die coating layer; 5. time-delay fluorescent pattern layer; 6. laser holographic layer. DETAILED DESCRIPTION

[0021] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present utility model and are not intended to limit its scope of protection. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which this utility model pertains. Example 1

[0022] like Figure 1 As shown: The transfer paper has multiple repeating pattern units, each unit containing 3 delayed fluorescent pattern layers 4. In each unit, the fluorescence disappearance time of the 3 delayed fluorescent pattern layers 4 is in the same order.

[0023] like Figure 2 The layer structure of the transfer paper is shown. The surface of the single-sided coated paper 1 is sequentially provided with a transfer adhesive layer 2, a reflective layer 3, a laser embossing coating layer 4, a time-delayed fluorescent pattern layer 5, and a laser holographic layer 6. There are 3 time-delayed fluorescent pattern layers 5, and the fluorescence disappearance time of each time-delayed fluorescent pattern layer 5 is different.

[0024] The transfer paper manufacturing process in this embodiment is as follows:

[0025] 1) Fluorescent pattern design: Based on different fluorescence disappearance times, the pattern encryption design is carried out. By controlling the combination and arrangement of different fluorescence disappearance inks, pattern information with specific fluorescence effects is designed. Fluorescent patterns can be text, numbers, scenery, people, company logos, etc., or they can be the superposition of multiple information patterns.

[0026] 2) BOPET film is selected, and the film thickness is generally 12-20 μm;

[0027] 3) A first laser-embossed coating 4 is applied to the surface of the BOPET film. This coating is not embossed; it serves only as a carrier layer for the subsequent delayed fluorescent pattern layer and as a transfer functional layer in the composite transfer process. The coating dry weight is 0.5-0.8 g / m². 2 The drying time is 5-10 seconds, and the drying temperature is 90-130℃.

[0028] 4) Delayed fluorescent patterns with different disappearance times are aligned or overprinted on the laser-molded coating 4 to form three delayed fluorescent pattern layers 5. The printing is done using flexographic printing, employing fluorescent inks carrying different fluorescence disappearance times for alignment or overprinting to form organic invisible fluorescent code patterns. The fluorescent inks are flexographic inks doped with nitrogen and fluorine copolymer fluorescent carbon quantum dot materials.

[0029] 6) Apply a second laser embossing coating on the time-delay fluorescent pattern layer 5. After the coating is completed, the layer structure is tightly combined and delamination is not allowed. The coating dry weight is 0.8-1.2 g / m 2 . The drying time is 5-10 s, and the drying temperature is 90-130℃.

[0030] 7) Form a laser holographic layer 6 by embossing a laser holographic pattern on the surface of the second laser embossing coating. The embossing temperature is 170-200℃, and the vehicle speed is 40-60 m / min.

[0031] 8) Vacuum deposition of a reflective layer. The reflective layer is one of metal aluminum, metal copper, zinc sulfide, and aluminum oxide. The main function of the reflective layer is to protect the laser holographic pattern. The high brightness feature of the reflective layer can also contrast the laser pattern, improving the brightness and color effect of the pattern.

[0032] 9) Select a single copper plate paper. The copper plate paper has a grammage of 30-150 g / m 2 .

[0033] 10) Compound. The BOPET film with the layer structure is compounded with the single copper plate paper on one side of the layer structure. Under the action of the transfer adhesive 7190G from Shanghai Yuanke Company, the layer structure on the surface of the BOPET film is completely bonded with the single copper plate paper.

[0034] 11) Peel off. The BOPET film is peeled off to form a time-delay fluorescent laser anti-counterfeiting transfer paper.

[0035] When the embodiment is used, one of the units on the transfer paper is irradiated by a UV light device. Under the excitation of UV light, the pattern of the time-delay fluorescent pattern layer 3 appears. When the UV light is turned off, the patterns of the time-delay fluorescent pattern layers 3 slowly disappear, and the time of disappearance of each part is different, which is used to verify the authenticity. Example 2

[0036] As Figure 1 described: In adjacent units, the order of the fluorescent disappearance time of the three time-delay fluorescent pattern layers is different. The others are the same as Example 1.

[0037] In this embodiment, the time-delay fluorescent pattern layers 3 of two adjacent units have the same position and quantity, but the order of the fluorescent disappearance time is different, which increases the difficulty of imitation.

[0038] The above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A time delay fluorescent laser security transfer paper characterized in that The single-side copper plate paper surface is sequentially provided with a transfer glue layer, a reflective layer, a first laser molding coating layer, a plurality of delay fluorescent pattern layers, and a laser holographic layer.

2. The time delay fluorescent laser security transfer paper according to claim 1, wherein The two same pattern units are distributed at intervals on the single-side copper plate paper, the number and position of the delay fluorescent pattern layers of the first unit correspond to the number and position of the delay fluorescent pattern layers of the second unit, and the order of the fluorescent disappearance time of the delay fluorescent pattern layers of the two units is different.

3. The time delay fluorescent laser security transfer paper according to claim 1, wherein The reflective layer is any one of a metal aluminum layer, a metal copper layer, a zinc sulfide layer, and an aluminum oxide layer.

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