Ink formula for scraping silver and printing method of scraping silver
By applying multiple coats of base oil to the paper before printing with a scratch-off silver solution, the problem of insufficient color registration accuracy in scratch-off silver printing is solved, achieving efficient mass production and a uniform and smooth printing effect.
Patent Information
- Application Number
- CN202511439415.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-09
- Publication Date
- 2026-01-13
AI Technical Summary
In existing technologies, scratch-off silver printing methods such as screen printing and UV printing have the problem of difficulty in ensuring accurate color registration, which leads to the scratch-off silver being easily scratched off.
An ink formulation is used, which includes a base oil and a scratch-off silver solution. The base oil is applied multiple times on the paper using a high-speed offset printing press, followed by scratch-off silver solution printing. Combined with multiple printing units of the high-speed offset printing press, the scratch-off silver solution is finally formed.
It improves the adhesion and opacity of scratch-off silver, enabling efficient mass production and achieving accurate, uniform, and smooth printing results.
Smart Images
Figure CN121319701A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of printing technology, and more particularly to an ink formulation for scratch-off silver printing and a method for printing scratch-off silver. Background Technology
[0002] Currently, books such as textbooks and supplementary teaching materials often have a scratch-off silver effect on the back cover or other locations. This is done to verify the authenticity of the books and prevent the circulation of pirated books. Books also come with value-added services such as course videos or other learning resources.
[0003] Currently, the common methods for printing scratch-off silver on books are screen printing and UV printing. However, both of these printing methods have the problem of difficulty in ensuring accurate color registration, which makes the scratch-off silver easy to scratch off. Summary of the Invention
[0004] In view of this, this application provides an ink formulation for scratch-off silver and a printing method for scratch-off silver, which enhances the adhesion and covering ability of scratch-off silver.
[0005] According to one aspect of this application, an ink formulation for scratch-off silver is provided, comprising a base oil and a scratch-off silver solution; the base oil comprises a resin, an initiator, a monomer, and a binder; the scratch-off silver solution comprises a resin, a monomer, an initiator, a filler, and silver paste; the base oil is applied multiple times on paper using a high-speed offset printing press, followed by scratch-off silver solution printing, to ultimately form scratch-off silver.
[0006] In one possible implementation, the silver paste comprises mineral oil and aluminum powder, wherein the mineral oil comprises 4.1 to 4.5 parts and the aluminum powder comprises 5 to 15 parts.
[0007] In one possible implementation, the resin of the scratch-off silver solution is a prepolymer, and the amount of the prepolymer is 30 to 40 parts.
[0008] In one possible implementation, the prepolymer is a polyester acrylate.
[0009] In one possible implementation, the monomers comprise acrylic monomer A and acrylic monomer B, wherein the amount of acrylic monomer A is 20-30 parts and the amount of acrylic monomer B is 7-12 parts.
[0010] In one possible implementation, the initiator of the base coat is an LED photoinitiator; the initiator of the scratch-off silver solution includes photoinitiator DETX, photoinitiator OMBB, and photoinitiator, wherein the amount of photoinitiator DETX is 0-5 parts, the amount of photoinitiator OMBB is 0-3 parts, and the amount of photoinitiator DTX is 0-2 parts.
[0011] In one possible implementation, the filler is in the form of 2 to 8 parts, and the filler comprises solid paraffin, polyethylene, and beeswax.
[0012] In one possible implementation, the primer oil comprises 63 parts resin, 12 parts initiator, 20 parts monomer, and 5 parts filler.
[0013] In one possible implementation, the above ink formulation is used in conjunction with a high-speed offset printing press, with the following specific steps: S1: First, a base coat is prepared by adding resin, LED photoinitiator, paraffin wax, and filler to a certain amount of water in a specific ratio to form the base coat; S2: Next, a scratch-off silver solution is prepared by mixing mineral oil and aluminum powder in a specific ratio to obtain silver paste, mixing solid paraffin wax, polyethylene, and beeswax to form polyethylene wax, and mixing silver paste, polyethylene wax, prepolymer, acrylic monomer A, acrylic monomer B, initiator DETX, photoinitiator OMBB, and photoinitiator DTX to obtain the scratch-off silver solution; S3: The obtained base coat and scratch-off silver solution are added to the printing unit of the high-speed offset printing press, and the power is turned on; S4: The base coat is printed multiple times on the paper, and then the scratch-off silver is printed on the base coat; S5: After printing, the paper is cured under a lamp to obtain the finished product.
[0014] In one possible implementation, the high-speed offset printing press has multiple printing units, and the resulting base oil and scratch silver solution are added to the last printing unit.
[0015] The beneficial effects of the present invention are as follows: By using the above-mentioned ink formula and combining it with a high-speed flatbed printing machine, the printing sheets are first printed with multiple coats of base oil to fill the gaps on the paper surface, enhance the adhesion and coverage of the scratch-off silver ink, and then scratch-off silver printing is performed to achieve high-speed flatbed scratch-off silver printing, which results in high printing efficiency, mass production capability, and accurate and uniform positioning. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the specific structure of the high-speed offset printing press used for the ink formulation and printing method of scratch-off silver in this embodiment. Figure 2 This is a schematic diagram of the printing unit of a high-speed offset printing press used in this embodiment for the ink formulation and printing method of scratch-off silver. Detailed Implementation
[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0018] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.
[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention or to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," "linking," "hinging," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0022] like Figures 1 to 2 As shown, the ink formulation for scratch-off silver includes a base oil and a scratch-off silver solution; the base oil includes resin, initiator, monomer and binder; the scratch-off silver solution includes resin, monomer, initiator, filler and silver paste; the base oil is applied multiple times on paper using a high-speed offset printing press, and then the scratch-off silver solution is applied to form scratch-off silver.
[0023] More specifically, the silver paste comprises mineral oil and aluminum powder, with the mineral oil comprising 4.1-4.5 parts and the aluminum powder comprising 5-15 parts. The resin in the scratch-off silver solution is a prepolymer, comprising 30-40 parts. The monomers include acrylic monomer A and acrylic monomer B, with acrylic monomer A comprising 20-30 parts and acrylic monomer B comprising 7-12 parts. The initiator for the base coat is an LED photoinitiator; the initiators for the scratch-off silver solution include photoinitiators DETX, OMBB, and DTX, with DETX comprising 0-5 parts, OMBB comprising 0-3 parts, and DTX comprising 0-2 parts. The filler comprises 2-8 parts and includes solid paraffin wax, polyethylene, and beeswax.
[0024] Preferably, the prepolymer is polyester acrylate.
[0025] The resulting scratch-off silver solution is more stable and has stronger adhesion.
[0026] In one possible implementation, the primer comprises 63 parts resin, 12 parts initiator, 20 parts monomer, and 5 parts binder.
[0027] The base coat prepared in this way can fill the gaps on the edge surface of the paper, making the subsequent silver solution printing onto the base coat more stable.
[0028] In one possible implementation, the above ink formulation is used in conjunction with a high-speed offset printing press, with the following specific steps: S1: First, a base coat is prepared by adding resin, LED photoinitiator, paraffin wax, and binder to a certain amount of water in a specific ratio to form the base coat; S2: Next, a scratch-off silver solution is prepared by mixing mineral oil and aluminum powder in a specific ratio to obtain silver paste, mixing solid paraffin wax, polyethylene, and beeswax to form polyethylene wax, and mixing silver paste, polyethylene wax, polyester acrylate, acrylic monomer A, acrylic monomer B, initiator DETX, photoinitiator OMBB, and photoinitiator DTX to obtain the scratch-off silver solution; S3: The obtained base coat and scratch-off silver solution are added to the printing unit of the high-speed offset printing press, and the power is turned on; S4: The base coat is printed multiple times on the paper, and then the scratch-off silver is printed on the base coat; S5: After printing, the paper is cured under a lamp to obtain the finished product.
[0029] In one possible implementation, a high-speed offset printing press has multiple printing units, and the resulting base oil and squeegee solution are added to the last printing unit.
[0030] It should be noted again that while high-speed flatbed printing machines are existing technology, they are not currently used for printing scratch-off silver. This application, through the above ink formula, combined with a high-speed flatbed printing machine, enables high efficiency in scratch-off silver printing, allowing for mass production with accurate and uniform positioning. The printed scratch-off silver also exhibits strong adhesion and overall greater stability.
[0031] according to Figure 1 As shown, the high-speed flatbed printing press specifically includes a paper feeding unit 1, a base 2, a printing unit 3, a curing system 10, and a paper receiving unit 9. The paper feeding section 1, base 2, and paper receiving section 9 are hollow structures. The base 2 has a preset length. The paper feeding section 1 is located at one end of the base 2, and the paper receiving section 1 is located at the other end of the base 2. Multiple paper transfer rollers 8 are installed inside the base 2 and are rotatably connected to each other to transfer paper. The printing unit 3 is located on top of the base 2 and is connected to the base 2. The printing unit is equipped with an impression cylinder 11, a rubber cylinder 12, a printing plate cylinder 13, an inking roller 14, and a watering system 15. The rubber cylinder 12 is located above the impression cylinder 11, and the printing plate cylinder 13 is located above the rubber cylinder 12. Multiple inking rollers 14 are provided and are located outside the printing plate cylinder 13. The watering system 15 is located above the printing plate cylinder 13. The impression cylinder 11, rubber cylinder 12, printing plate cylinder 13, and inking roller 14 are driven by a motor and are used to print base oil and scratch silver on the paper.
[0032] In the overall printing process, during actual use, the paper is conveyed from the left side of the conveyor section 1 to the printing unit 3. The paper passes between the impression cylinder 11 and the rubber cylinder 12 for printing. The inking roller 14 rotates to apply the base oil / scratch silver to the outer surface of the rubber cylinder 12. The impression cylinder 11 presses the paper to print the base oil / scratch silver on the rubber cylinder 12 onto the paper. The paper is printed from the printing unit 3 to the LED-UV curing system 10 for drying, and finally to the paper receiving section 9. During the printing process, the base oil is printed on the white paper first, and then the scratch silver is printed on the base oil to complete the scratch silver printing work on the paper.
[0033] Since high-precision flatbed printing is an existing technology, and the working principle of the equipment is also existing, it will not be elaborated on here.
[0034] However, it should be noted that this application requires the use of a high-speed flatbed printing press with four or more printing units. This is because only high-speed flatbed printing presses with four or more printing units have a curing system. Therefore, when the paper passes through the first few printing units, it does not print. Printing only begins when the paper passes through the last printing unit.
[0035] The following are embodiments and comparative examples of this application: Example 1 The primer contains 63 parts resin, 12 parts initiator, 20 parts monomer, and 5 parts binder. The scratch-off silver solution comprises 4.1 parts mineral oil, 5.9 parts aluminum powder, 30 parts prepolymer, 30 parts acrylic monomer A, 12 parts acrylic monomer B, 5 parts photoinitiator DETX, 3 parts photoinitiator OMBB, 2 parts photoinitiator DTX, and a total of 8 parts solid paraffin, polyethylene, and beeswax.
[0036] Prepare according to the following steps: S1: First, prepare the base coat by adding resin, LED photoinitiator, paraffin wax and binder to a certain amount of water in a certain proportion to form the base coat; S2: Prepare the scraping silver solution by mixing mineral oil and aluminum powder in a certain proportion to obtain silver paste, mixing solid paraffin, polyethylene and beeswax to form polyethylene wax, and mixing silver paste, polyethylene wax, polyester acrylate, acrylic monomer A, acrylic monomer B, initiator DETX, photoinitiator OMBB and photoinitiator DTX to obtain the scraping silver solution. S3: Add the obtained base oil and scratch silver solution to the printing unit of the high-speed offset printing press and start the power; S4: First, print the base coat multiple times on the paper, then print the scratch-off silver on the base coat; S5: After printing is completed, the product is cured under a lamp to obtain the finished product.
[0037] It should be noted that when the paper passes through the first few printing units, it is only passed through without being printed. Printing only begins when the paper passes through the last printing unit.
[0038] Example 2 The primer contains 63 parts resin, 12 parts initiator, 20 parts monomer, and 5 parts binder. The scratch-off silver solution comprises 4.1 parts mineral oil, 5 parts aluminum powder, 30 parts polyester acrylate, 20 parts acrylic monomer A, 7 parts acrylic monomer B, 1 part photoinitiator DETX, 1 part photoinitiator OMBB, 1 part photoinitiator DTX, and a total of 2 parts solid paraffin, polyethylene, and beeswax.
[0039] Prepare according to the following steps: S1: First, prepare the base coat by adding resin, LED photoinitiator, paraffin wax and binder to a certain amount of water in a certain proportion to form the base coat; S2: Prepare the scraping silver solution by mixing mineral oil and aluminum powder in a certain proportion to obtain silver paste, mixing solid paraffin, polyethylene and beeswax to form polyethylene wax, and mixing silver paste, polyethylene wax, polyester acrylate, acrylic monomer A, acrylic monomer B, initiator DETX, photoinitiator OMBB and photoinitiator DTX to obtain the scraping silver solution. S3: Add the obtained base oil and scratch silver solution to the printing unit of the high-speed offset printing press and start the power; S4: First, print the base coat multiple times on the paper, then print the scratch-off silver on the base coat; S5: After printing is completed, the product is cured under a lamp to obtain the finished product.
[0040] It should be noted that when the paper passes through the first few printing units, it is only passed through without being printed. Printing only begins when the paper passes through the last printing unit.
[0041] Example 3 The primer contains 63 parts resin, 12 parts initiator, 20 parts monomer, and 5 parts binder. The scratch-off silver solution comprises 4.5 parts mineral oil, 15 parts aluminum powder, 40 parts polyester acrylate, 30 parts acrylic monomer A, 12 parts acrylic monomer B, 5 parts photoinitiator DETX, 3 parts photoinitiator OMBB, 2 parts photoinitiator DTX, and a total of 8 parts solid paraffin, polyethylene, and beeswax.
[0042] Prepare according to the following steps: S1: First, prepare the base coat by adding resin, LED photoinitiator, paraffin wax and binder to a certain amount of water in a certain proportion to form the base coat; S2: Prepare the scraping silver solution by mixing mineral oil and aluminum powder in a certain proportion to obtain silver paste, mixing solid paraffin, polyethylene and beeswax to form polyethylene wax, and mixing silver paste, polyethylene wax, polyester acrylate, acrylic monomer A, acrylic monomer B, initiator DETX, photoinitiator OMBB and photoinitiator DTX to obtain the scraping silver solution. S3: Add the obtained base oil and scratch silver solution to the printing unit of the high-speed offset printing press and start the power; S4: First, print the base coat multiple times on the paper, then print the scratch-off silver on the base coat; S5: After printing is completed, the product is cured under a lamp to obtain the finished product.
[0043] It should be noted that when the paper passes through the first few printing units, it is only passed through without being printed. Printing only begins when the paper passes through the last printing unit.
[0044] The scratch-off silver prepared through Examples 1, 2, and 3 has strong adhesion and comprehensive coverage, thus improving the overall quality of the scratch-off silver.
[0045] Comparative Example 1 The scratch-off silver produced by screen printing has a low quality and poor effect due to the lack of precise color matching.
[0046] Comparative Example 2 The scratch-off silver printed by a UV printer is printed on top of two base coats, making the scratch-off silver easy to scratch off.
[0047] In summary, by using the above ink formula and combining it with a high-speed flatbed printing press, the printing sheets are first coated with multiple layers of base oil to fill the gaps on the paper surface, enhance the adhesion and coverage of the scratch-off silver ink, and then the scratch-off silver printing is performed. This achieves high-speed flatbed scratch-off silver printing, resulting in high printing efficiency, enabling mass production, and producing precise, uniform, and flat printing.
[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. An ink formulation for scratch-off silver ink, characterized in that, Includes base coat and squeegee silver solution; The primer oil includes resin, initiator, monomer and binder; The scraping silver solution comprises resin, monomer, initiator, filler and silver paste; The paper is printed with multiple coats of base oil using a high-speed offset printing press, followed by scratch-off silver solution printing to finally form scratch-off silver.
2. The ink formulation for scratch-off silver ink according to claim 1, characterized in that, The silver paste comprises mineral oil and aluminum powder, wherein the mineral oil comprises 4.1 to 4.5 parts and the aluminum powder comprises 5 to 15 parts.
3. The ink formulation for scratch-off silver ink according to claim 2, characterized in that, The resin in the scratch-off silver solution is a prepolymer, and the prepolymer comprises 30-40 parts.
4. The ink formulation for scratch-off silver ink according to claim 3, characterized in that, The prepolymer is a polyester acrylate.
5. The ink formulation for scratch-off silver ink according to claim 4, characterized in that, The monomers include acrylic monomer A and acrylic monomer B, wherein the amount of acrylic monomer A is 20-30 parts and the amount of acrylic monomer B is 7-12 parts.
6. The ink formulation for scratch-off silver ink according to claim 5, characterized in that, The initiator of the base coat is an LED photoinitiator; The initiator of the scratch-off silver solution includes photoinitiator DETX, photoinitiator OMBB and photoinitiator DTX, and the amount of photoinitiator DETX is 0-5 parts, the amount of photoinitiator OMBB is 0-3 parts and the amount of photoinitiator DTX is 0-2 parts.
7. The ink formulation for scratch-off silver ink according to claim 6, characterized in that, The filler is present in 2 to 8 parts, and the filler includes solid paraffin, polyethylene and beeswax.
8. The ink formulation for scratch-off silver ink according to claim 1, characterized in that, The primer oil contains 63 parts resin, 12 parts initiator, 20 parts monomer, and 5 parts filler.
9. A method for printing scratch-off silver, characterized in that, Using the ink formulation according to any one of claims 1-8, combined with a high-speed flatbed printing press, the specific steps are as follows: S1: First, prepare the base coat by adding resin, LED photoinitiator, paraffin wax and binder to a certain amount of water in a certain proportion to form the base coat; S2: Prepare the scraping silver solution by mixing mineral oil and aluminum powder in a certain proportion to obtain silver paste, mixing solid paraffin, polyethylene and beeswax to form polyethylene wax, and mixing silver paste, polyethylene wax, prepolymer, acrylic monomer A, acrylic monomer B, initiator DETX, photoinitiator OMBB and photoinitiator DTX to obtain scraping silver solution. S3: Add the obtained base oil and scratch silver solution to the printing unit of the high-speed offset printing press and start the power; S4: First, print the base coat multiple times on the paper, then use the scratch-off silver solution to print on the base coat; S5: After printing is completed, the product is cured under a lamp to obtain the finished product.
10. The method for printing scratch-off silver according to claim 9, characterized in that, The high-speed offset printing press has multiple printing units, and the obtained base oil and scratch silver solution are added to the last printing unit.