Packaging sheet set

Abstract

The present invention provides a packaging sheet set, including a plurality of sheets made of composite packaging materials, each sheet being a unit for forming a separate package, the sheet having a base layer, a printing layer and a waterproof layer from the inside to the outside, the printing layer of each sheet having a variable code, and the variable code of each sheet being unique, the variable code being covered by a scratch-off ink layer, and a variable ink layer being provided above the scratch-off ink layer, and the color of the variable ink layer being changeable under infrared or ultraviolet irradiation. The variable ink layer above the variable code of the present application becomes opaque under infrared or ultraviolet irradiation, and the variable code can be conveniently changed from a public state to an invisible confidential state as needed, so that the variable code can be used for public information such as associated product traceability, and can also be used for associated prize redemption and other information that needs to be kept confidential before purchase, thereby enriching the function of the variable code and simplifying the production steps.

Description

Technical Field

[0001] The present invention relates to a packaging sheet set, in particular to a packaging sheet set for packaging liquid beverages. Background Art

[0002] Liquid food such as milk, yogurt, and semi-liquid food such as juice are usually sold in small-volume packaging containers. This packaging container is formed by the continuous roll of packaging material, and this material roll can be cut to form blank, or longitudinally sealed to form the tube of packaging material, then seal-molded when filling content, finally folded into the shape of final packaging at folding station. For liquid or semi-liquid food, current packaging container is made of paper-based composite packaging material, and this packaging material has paper fiber core and this core is surrounded by one or more layers of barrier materials, such as polymer coating and / or metal film, thereby obtains composite packaging material.This barrier material is used to protect the core material from contacting with the product held and also protects the product from the influence of gas and moisture around the packaging container.

[0003] In recent years, the state has put forward clear quality system management requirements and traceability information system construction requirements for some important commodities related to human health, such as food, medicine, and infant formula. Existing product packaging usually has a unique mark, including dot matrix code, bar code, QR code or digital code, etc. as an anti-counterfeiting traceability mark. Consumers can achieve product traceability, authenticity verification, and participate in marketing activities by scanning with handheld devices such as mobile phones. However, the mark directly exposed on the surface of the product packaging is often stolen before the product is sold. To prevent this from happening, the mark is usually blocked. Only after purchase can the blockage be removed to scan and identify the mark.

[0004] The problem is that in the field of liquid food packaging, the production and manufacturing of packaging materials and the filling and molding of liquid food into sealed packaging are two processes that are completely separated in time and space, and are completed by different manufacturers and at different production locations. In order to match the filling speed, the logo on the sealed packaging is usually printed on the packaging material during the production stage of the packaging material, and the logo is read and associated with the production process information after it is formed into a sealed package. Therefore, if the logo is blocked during the production stage of the packaging material, it will result in the inability to read the logo after the sealed packaging is completed, and thus the production and traceability information of the product cannot be associated, and it can only be used for activities such as product redemption, anti-counterfeiting or points; if the logo is not blocked, it can only be used to associate public information such as product production to avoid stealing. In the prior art, whether it is to use an opaque ink layer or a self-adhesive sticker to block the logo after filling and molding into a sealed package, or to use a method of adding a logo, it is necessary to add additional equipment and processes, which greatly affects production efficiency. Summary of the invention

[0005] The main purpose of the present invention is to provide a packaging sheet set with a variable ink layer covered on a variable code, and the color of the variable ink layer can be changed under infrared or ultraviolet irradiation.

[0006] According to one aspect of the present invention, there is provided a packaging sheet set, comprising a plurality of sheets made of a composite packaging material, each sheet being a unit for forming a separate package, the sheet having a base layer, a printing layer and a waterproof layer from the inside to the outside, each sheet having a variable code, and the variable codes of two sheets are different from each other, and characterized in that the variable code is covered by a translucent scratch-off ink layer, and a variable layer is further provided above the scratch-off ink layer, and the variable layer changes color under infrared or ultraviolet irradiation.

[0007] According to a preferred embodiment of the present invention, the variable ink layer is an ink layer containing titanium dioxide.

[0008] According to a preferred embodiment of the present invention, the color of the variable ink layer changes irreversibly under infrared or ultraviolet irradiation.

[0009] According to a preferred embodiment of the present invention, the scratch-off ink layer includes a two-layer structure, which is an isolation layer and an intermediate layer from the inside to the outside.

[0010] According to a preferred embodiment of the present invention, the scraping ink layer further includes a reinforcing layer, and the reinforcing layer is located above the intermediate layer.

[0011] According to a preferred embodiment of the present invention, the bonding force between the intermediate layer and the isolation layer is smaller than the bonding force between the remaining layers of the sheet material, so that the intermediate layer is separated from the isolation layer under the action of an external force.

[0012] According to a preferred embodiment of the present invention, the isolation layer comprises a transparent epoxy acrylic resin, a monomer and an initiator.

[0013] According to a preferred embodiment of the present invention, the intermediate layer comprises acrylic emulsion and an auxiliary agent.

[0014] According to a preferred embodiment of the present invention, the reinforcement layer comprises titanium dioxide, acrylic emulsion and additives.

[0015] According to a preferred embodiment of the present invention, the infrared or ultraviolet radiation intensity is 10-80 milliwatts.

[0016] According to a preferred embodiment of the present invention, the area of ​​the variable ink layer is not greater than the area of ​​the scratch-off ink layer.

[0017] The variable ink layer on the packaging sheet group in the present application can change color under infrared or ultraviolet irradiation, so that the variable code covered by the variable ink layer can be changed from a visible public state to an invisible confidential state as needed, and the transformation method is flexible, simple and easy to operate, so that the same variable code can be associated with public information and confidential information at the same time, enriching the function of the variable code and simplifying the production steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings:

[0019] Figure 1 Shown is a three-dimensional view of a composite packaging material according to an embodiment of the present invention.

[0020] Figure 2 FIG. 1 is a schematic cross-sectional view of a composite packaging material according to an embodiment of the present invention.

[0021] Figure 3 FIG. 1 is a schematic cross-sectional view of a composite packaging material according to another embodiment of the present invention.

[0022] Figure 4 Shown is a schematic diagram of a packaging sheet group made of the composite packaging material of the present invention.

[0023] Figure 5 Shown is a schematic diagram of a sealed packaging group made of the composite packaging material of the present invention.

[0024] Figure 6 Shown is a partial exploded view of the location of the variable code of the packaging sheet set of the present invention.

[0025] Reference numerals

[0026] 1- Individually packed units 2- Composite packaging material 11- Base layer

[0027] 12-printing layer 13, 13'-variable code 14-isolation layer

[0028] 15-middle layer 16-variable ink layer 17-waterproof layer

[0029] 18-Enhancement layer DETAILED DESCRIPTION

[0030] The following is a detailed description of the technical means used by the present invention to achieve the intended purpose of the invention with reference to the accompanying drawings and preferred embodiments of the present invention.

[0031] Figure 1The composite packaging material 2 is a three-dimensional view of an embodiment of the present invention. The composite packaging material 2 has a plurality of units 1 for forming a single package. Each unit is provided with a variable code 13, and the variable code 13 is unique, that is, the variable codes 13 of two units are different from each other. Figure 1 The variable codes 13 and 13' shown in the figure are located in different units, and the variable codes 13 and 13' are different from each other. In addition, the relative position description from top to bottom in the layer structure of the composite packaging material involved in the present invention corresponds to the relative position description from outside to inside when the composite packaging material is used for product packaging.

[0032] Figure 2The cross-sectional schematic diagram of a composite packaging material of an embodiment of the present invention is shown. From the inside to the outside, the composite packaging material 2 is composed of a base layer 11, a printing layer 12, a variable code 13, an isolation layer 14, an intermediate layer 15, a variable ink layer 16 and a waterproof layer 17. The base layer 11 can be a paper substrate. The variable code 13 can be any one of a dot matrix code, a bar code, a two-dimensional code, a digital string, or a combination of more than one of them, but is not limited thereto. The variable code 13 is formed on the surface of the printing layer 12 by spraying, printing or pasting during the production process of the packaging material. A scraping ink layer is covered above the variable code 13, and the area of ​​the scraping ink layer is preferably not less than the area of ​​the variable code 13. The structure of the scraping ink layer includes an isolation layer 14 and an intermediate layer 15. The isolation layer 14 is in direct contact with the variable code 13 and is mainly used to protect the variable code 13. Otherwise, the intermediate layer 15 is easily absorbed by the paper, resulting in the inability to scrape or break the variable code 13. The isolation layer 14 can be printed with an isolation varnish, and the isolation varnish can be a water-based varnish or a UV varnish, preferably a UV varnish. The components of the isolation layer 14 may include transparent epoxy acrylic resin, monomers and initiators. The monomers may be selected from ester monomers or organic siloxane monomers, such as methyl methacrylate monomers, butyl acrylate monomers, vinyl triisopropoxy silane, etc.; the initiator is mainly composed of 1-hydroxycyclohexyl phenyl ketone, 4-phenyl dibenzophenone and 2,4,6-trimethylbenzoyl. Above the isolation layer 14 is the middle layer 15, which is generally transparent or translucent. The middle layer 15 includes acrylic emulsion and auxiliary agents, and the auxiliary agents include ethanol, propylene glycol, methyl ether, defoaming agent, etc. Above the scratch-off ink layer composed of the isolation layer 14 and the middle layer 15 is the variable ink layer 16, and the area of ​​the variable ink layer 16 is preferably not larger than the area of ​​the scratch-off ink layer to save costs and improve efficiency, because the variable code 13 can be made unreadable without completely covering the scratch-off ink layer or the variable code 13, and partial shielding can also prompt consumers to scratch off the shielding to reveal the variable code 13. The variable ink layer 16 is an ink layer containing titanium dioxide, and the titanium dioxide can directly adopt various titanium dioxide commonly used in the prior art, and its main component is titanium dioxide. Based on the total mass of the ink composition, the content of titanium dioxide is 3-15wt%. The variable ink layer 16 is covered with a waterproof layer 17. The variable ink layer 16 can change color under infrared or ultraviolet irradiation, such as becoming opaque black; the infrared wavelength preferably ranges from 700-2500nm near infrared or 2500-25000nm mid-infrared; the ultraviolet wavelength preferably ranges from 200nm to 400nm, and the infrared or ultraviolet radiation is provided by a laser such as a CO2 laser, a fiber laser, a solid-state laser, an excimer laser, a laser diode or a diode array, etc. The intensity of the infrared or ultraviolet irradiation is 10-80 milliwatts, preferably 60 milliwatts, and the color change process of the variable ink layer 16 after being irradiated by infrared or ultraviolet is irreversible.

[0033] When the packaging materials are produced by the packaging material production enterprise, the variable code 13 is in a visible state. After the packaging materials are transported to the filling enterprise, the filling enterprise can scan the variable code 13 at any time during the production process of using the packaging materials for filling, and associate the variable code 13 with various data and information in the product production process, such as the origin of the raw materials, production time, production line and shipping place information, etc., to achieve information management of the product production process. In addition, the variable code 13 can also be used to associate prize redemption information, anti-counterfeiting or for points. Since this type of information has the nature of rewarding consumption, in order to avoid stealing, the variable code 13 needs to be kept confidential before purchase. Therefore, the filling enterprise can perform infrared or ultraviolet irradiation on the variable ink layer 16 before leaving the factory to change the color of the variable ink layer 16, and the variable code 13 is in an invisible state. Only real consumers can scratch off the coating and read the variable code 13 after purchasing.

[0034] Figure 3 FIG. 2 is a schematic cross-sectional view of a composite packaging material according to another embodiment of the present invention. Figure 2 The difference is, Figure 3 The scraping ink layer has a reinforcing layer 18 above the middle layer 15. The reinforcing layer 18 is composed of titanium dioxide added to the middle layer 15. The reinforcing layer 18 can stabilize the structure of the scraping ink layer and can also enhance the covering ability of the variable ink layer 16 after being irradiated with infrared or ultraviolet light and changing color. The bonding force between the isolation layer 14 and the middle layer 15 in the packaging material is the weakest, which is smaller than the bonding force between the other layers of the packaging material: the bonding force between the isolation layer 14 and the middle layer 15 is smaller than the bonding force between the middle layer 15 and the reinforcing layer 18 and / or smaller than the bonding force between the variable ink layer 16 and the reinforcing layer 18 and / or smaller than the bonding force between the variable ink layer 16 and the waterproof layer 17 and / or smaller than the bonding force between the variable code 13 and the isolation layer 14 and / or smaller than the bonding force between the variable code 13 and the printing layer 12 and / or smaller than the bonding force between the isolation layer 14 and the base layer 11. The area of ​​the variable ink layer 16 is not larger than the area of ​​the scraping ink layer, and the area of ​​the scraping ink layer is not smaller than the area of ​​the variable code 13.

[0035] Figure 4 The figure shows a packaging sheet set provided by the present invention, comprising a plurality of sheets made of the aforementioned composite packaging material, each sheet being a unit for forming a separate package, and the sheet having a base layer 11, a printing layer 12, a variable code 13, an isolation layer 14, an intermediate layer 15, a variable ink layer 16 and a waterproof layer 17 from the inside to the outside, or the sheet having a base layer 11, a printing layer 12, a variable code 13, an isolation layer 14, an intermediate layer 15, a reinforcement layer 18, a variable ink layer 16 and a waterproof layer 17 from the inside to the outside. Figure 4 One sheet of a sheet group is schematically shown. Figure 4 The area indicated by the letter A is the location of the variable code 13 on the sheet. Figure 6The figure shows a partial exploded view of the layer structure where the variable code 13 is located. Each sheet is provided with a unique variable code 13. The variable code 13 can be any one of a dot matrix code, a bar code, a QR code, a digital string, or a combination of more than one of them, but is not limited thereto. The variable code 13 can be used to associate product traceability and other information that can be disclosed to the public, and can also be used to associate prize redemption and other information that needs to be kept confidential. The variable code 13 is covered with a scratch-off ink layer, and the area of ​​the scratch-off ink layer is preferably not less than the area of ​​the variable code 13. The structure of the scratch-off ink layer can include only an isolation layer 14 and an intermediate layer 15, and a reinforcement layer 18 can be added above the intermediate layer 15. Above the scratch-off ink layer is a variable ink layer 16, and the area of ​​the variable ink layer 16 is preferably not larger than the area of ​​the scratch-off ink layer, which completely or partially blocks the variable code 13, as long as it is ensured that the part of the variable code 13 that is not blocked by the variable layer 16 after the color change cannot be read by the device. Figure 4 The lines in the figure represent the fold lines and the printed area boundaries when the package is formed.

[0036] The packaging sheet set can be formed by cutting the aforementioned composite packaging material into packaging sheets as needed after it is manufactured.

[0037] Figure 5 The figure shows a sealed packaging group provided by the present invention, which is formed by the aforementioned composite packaging material or packaging sheet group through the steps of filling, sealing, shaping, etc., including a plurality of sealed packages composed of composite packaging materials, and the composite packaging material used in each package has a base layer 11, a printing layer 12, a variable code 13, an isolation layer 14, an intermediate layer 15, a variable ink layer 16 and a waterproof layer 17 from the inside to the outside, or the package has a base layer 11, a printing layer 12, a variable code 13, an isolation layer 14, an intermediate layer 15, a reinforcement layer 18, a variable ink layer 16 and a waterproof layer 17 from the inside to the outside. Figure 5 One package from a package group is shown schematically. Figure 5 The area indicated by letter A is the location of variable code 13 on the sealed package. Figure 6 The figure shows a partial exploded view of the layer structure where the variable code 13 is located, and each package is provided with a unique variable code 1. The variable code 13 is covered with a scratch-off ink layer, and the area of ​​the scratch-off ink layer is preferably not less than the area of ​​the variable code 13. The structure of the scratch-off ink layer may only include an isolation layer 14 and an intermediate layer 15, and a reinforcement layer 18 may be provided above the intermediate layer 15. Above the scratch-off ink layer is a variable ink layer 16, and the area of ​​the variable ink layer 16 is preferably not greater than that of the scratch-off ink layer, which completely or partially blocks the variable code 13, as long as the part of the variable code 13 other than the part blocked by the variable layer 16 after the color change cannot be read by the device.

[0038] The present invention is particularly suitable for packaging of liquid beverages, but the present invention is not limited thereto. The present invention is also suitable for other paper-based packaged products, such as food and pharmaceutical products.

[0039] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A packaging sheet set, comprising a plurality of sheets made of composite packaging materials, each sheet being a unit for forming a separate package, the sheet having a base layer, a printing layer and a waterproof layer from the inside to the outside, each sheet having a variable code, and the variable codes of two sheets are different from each other, characterized in that: The variable code is covered by a translucent scratch-off ink layer, and a variable ink layer is provided above the scratch-off ink layer. The variable ink layer changes color under infrared or ultraviolet irradiation and the color change is irreversible, so that the variable code covered by the variable ink layer is changed from a visible public state to an invisible confidential state.

2. The packaging sheet set according to claim 1, characterized in that: The variable ink layer is an ink layer containing titanium dioxide.

3. The packaging sheet set according to claim 1, characterized in that: The scratch-off ink layer comprises a two-layer structure, which is an isolation layer and an intermediate layer from the inside to the outside.

4. The packaging sheet set according to claim 3, characterized in that: The scraping ink layer further comprises a reinforcing layer, and the reinforcing layer is located above the middle layer.

5. The packaging sheet set according to claim 3 or 4, characterized in that: The bonding force between the intermediate layer and the isolation layer is smaller than the bonding force between the remaining layers of the sheet material, so that the intermediate layer is separated from the isolation layer under the action of an external force.

6. The packaging sheet set according to claim 3, characterized in that: The isolation layer comprises transparent epoxy acrylic resin, monomer and initiator.

7. The packaging sheet set according to claim 3, characterized in that: The intermediate layer comprises acrylic emulsion and an auxiliary agent.

8. The packaging sheet set according to claim 4, characterized in that: The reinforcing layer comprises titanium dioxide, acrylic emulsion and additives.

9. The packaging sheet set according to claim 1, characterized in that: The infrared or ultraviolet radiation intensity is 10-80 milliwatts.

10. The packaging sheet set according to claim 1, characterized in that: The area of ​​the variable ink layer is not greater than the area of ​​the scraping ink layer.

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