A production process of a printable windowed line anti-counterfeiting card paper

Abstract

The application discloses a production process of printable windowed line anti-fake card paper and belongs to the technical field of paper processing. The production process is as follows: transition layer coating is coated on the windowed line of the original paper of the windowed line anti-fake card paper, dried to obtain a transition layer; then, surface coating is coated on the surface of the transition layer, dried to obtain a surface coating, cooled, and wound to obtain the printable windowed line anti-fake card paper; the transition layer coating is made by mixing modified starch, polyvinyl alcohol fiber, casein, a leveling agent, a penetrating agent, a water-resistant agent, a quick-drying agent and a defoaming agent; and the surface coating is made by mixing modified starch, polyvinyl alcohol, a polylactic acid solution, a leveling agent, a water-resistant agent, a wax emulsion, a surfactant, a thickening agent, a wear-resistant agent, silicon dioxide and a defoaming agent. The application realizes effective preparation of the printable windowed line anti-fake card paper, the card paper coating has good transparency and can be finely printed, and the problems of large deformation and poor box stability of the current windowed line anti-fake card paper are solved.

Description

Technical Field

[0001] This invention relates to the field of paper processing technology, and more specifically, to a production process for printable windowed anti-counterfeiting cardstock. Background Technology

[0002] Currently, conventional windowed security thread anti-counterfeiting cardstock on the market generally has a rough surface, is uncoated, and cannot meet the high-quality printing requirements of packaging cardstock, and also has poor box-forming performance. In contrast, windowed security thread cardstock, which can be used for high-quality printing and allows direct observation of its anti-counterfeiting function, is often made with a weight of 70-90 g / m². 2 The anti-counterfeiting paper with a windowed security thread has a weight of 170g / m². 2 The composite of cardboard and paperboard has problems such as large paper deformation and poor stability of the box. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a production process for printable windowed anti-counterfeiting cardstock.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A production process for printable windowed anti-counterfeiting card paper involves applying a transition layer coating to one side of the windowed line on the base paper of the windowed anti-counterfeiting card paper, drying it to obtain a transition layer; applying a top coating coating to the surface of the transition layer, drying it to obtain a top coating; cooling and winding it to obtain printable windowed anti-counterfeiting card paper.

[0006] The transition layer coating is made by mixing modified starch, polyvinyl alcohol fiber, casein, leveling agent, penetrant, water-resistant agent, quick-drying agent, and defoamer;

[0007] The topcoat is made by mixing modified starch, polyvinyl alcohol fiber, leveling agent, water-resistant agent, wax emulsion, surfactant, thickener, abrasion resistant agent, silica, and defoamer.

[0008] The present invention is further configured such that the dry weight of the transition layer coating is 12-15 g / m². 2 .

[0009] The present invention is further configured such that the dry weight of the topcoat coating is 11-16 g / m². 2 .

[0010] The present invention is further configured such that, based on 100% of the total mass of the transition layer coating raw materials, the transition layer coating is made of the following raw materials in the following mass percentages: modified starch 20-32%, polyvinyl alcohol fiber 15-44%, casein 20-30%, leveling agent 0.5-5%, penetrant 0.5-3%, water-resistant agent 0.5-2.5%, quick-drying agent 0.5-1%, and the balance being defoamer.

[0011] The present invention is further configured such that, based on 100% of the total mass of the raw materials for the topcoat, the topcoat is made of the following raw materials in the following mass percentages: 30-45% modified starch, 50-60% polyvinyl alcohol fiber, 0.5-5% leveling agent, 0.2-2.5% water-resistant agent, 0.3-3% wax emulsion, 0.2-1.5% surfactant, 0.5-3% thickener, 0.1-4% abrasion resistant agent, 0.1-0.8% silica, and the balance being defoamer.

[0012] In summary, the present invention has the following beneficial effects:

[0013] This invention uses commercially available windowed anti-counterfeiting cardstock as the base paper. A high-transparency coating is obtained by applying two coating processes to one side of the windowed line. This allows for direct observation of the clear microtext on the anti-counterfeiting windowed line (high transparency), and also enables fine printing directly on the coating or transferring a composite transparent metal film onto the coating before fine printing. This improves upon the current problems of large paper deformation and poor box-forming stability of windowed anti-counterfeiting cardstock. Attached Figure Description

[0014] Figure 1 This is a picture of the cardboard product obtained in Embodiment 1 of the present invention. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] The method for preparing the printable windowed security card paper of this invention is as follows: A transition layer coating is applied to one side of the windowed security card paper base paper (base paper weight is 200-300 g / m²). 2 The anilox roller pressure is 0.3-0.5 MPa, the coating speed is 98-105 m / min, and the drying temperature is 80-100℃, to obtain a transition layer (coating dry weight is 12-15 g / m). 2 The topcoat coating is applied to the surface of the transition layer under an anilox roller pressure of 0.3-0.5 MPa and a coating speed of 98-105 m / min, and then dried at a temperature of 80-100℃ to obtain the topcoat (with a dry weight of 11-16 g / m²). 2 Cool to room temperature, rewind, and you will get printable windowed anti-counterfeiting cardstock.

[0017] Based on 100% of the total mass of the transition layer coating raw materials, the transition layer coating is made from the following raw materials in the following mass percentages: modified starch 20-32%, polyvinyl alcohol fiber 15-44%, casein 20-30%, leveling agent 0.5-5%, penetrant 0.5-3%, water-resistant agent 0.5-2.5%, quick-drying agent 0.5-1%, and the balance being defoamer. The penetrant is preferably one of the fatty alcohol polyoxyethylene ether penetrants; the quick-drying agent is preferably one of hydroxymethyl propane diallyl ether and a metal drying agent.

[0018] Based on 100% of the total mass of the raw materials for the topcoat, the topcoat is made from the following raw materials in the following mass percentages: modified starch 30-45%, polyvinyl alcohol fiber 50-60%, leveling agent 0.5-5%, water-resistant agent 0.2-2.5%, wax emulsion 0.3-3%, surfactant 0.2-1.5%, thickener 0.5-3%, abrasion resistant agent 0.1-4%, silica 0.1-0.8%, and the balance being defoamer. The surfactant is one of alkylbenzene sulfonates or fatty alcohol polyoxyethylene ethers; the abrasion resistant agent is one of polyurethane or silicone abrasion resistant agents; and the thickener is one of a mixture of sodium polyacrylate and resin arabic or a mixture of propylene glycol alginate and polyethylene oxide.

[0019] In both the transition layer coating and the topcoat coating, the defoamer is preferably any one of acetylene glycol defoamer, silicone defoamer, or polyether defoamer; the leveling agent is preferably any one of polydimethylsiloxane leveling agent, polymethylphenylsiloxane leveling agent, or polyether-modified siloxane leveling agent; and the water-resistant agent is preferably any one of polyamide-polyurea water-resistant agent or zirconium carbonate.

[0020] Example 1

[0021] (a) Apply the transition layer coating to the windowed side of the anti-counterfeiting cardstock base paper using a 100-mesh anilox roller (the base paper weight of the anti-counterfeiting cardstock base paper is 230 g / m²). 2 The coating material, with a thickness of 0.29 mm, was purchased from Shandong Sun Paper Industry Co., Ltd.; the anilox roller pressure was 0.4 MPa, and the coating speed was 100 m / min. It was then fed into the drying channel of the coating machine at a rate of 100 m / min for drying (drying air velocity 3.0 m / s, drying temperatures successively 80℃, 90℃, 100℃, 90℃, 80℃, drying time 15 s), forming a transition layer (coating dry weight 12 g / m²). 2 ).

[0022] The transition layer coating is composed of the following raw materials by weight percentage: 30% modified starch, 40% polyvinyl alcohol fiber, 23.2% casein, 2.5% leveling agent, 2% penetrant, 1.5% water-resistant agent, 0.5% quick-drying agent, and 0.3% defoamer.

[0023] The modified starch was corn modified starch, purchased from Leshengyuan Biotechnology (Nanjing) Co., Ltd., model Y03; the polyvinyl alcohol fiber was purchased from Shenzhen Boshun Chemical Co., Ltd., model SS-40; the casein was purchased from Ningbo Xincaihong Biotechnology Co., Ltd., model HBW-G65; the leveling agent was polymethylphenylsiloxane leveling agent, purchased from Jiangsu Longen Chemical New Materials Co., Ltd., model DC556; the penetrant was penetrant JFC-1 (fatty alcohol polyoxyethylene ether), purchased from Jiangsu Haian Petrochemical Plant; the water-resistant agent was water-resistant agent ZN-618A (polyamide polyurea water-resistant agent), purchased from Zhejiang Zhongnuo New Materials Technology Co., Ltd.; the fast-drying agent was trimethylolpropane diallyl ether, purchased from Hefei Anbang Chemical Co., Ltd., model JN853; and the defoamer was silicone defoamer BYK-065, purchased from Nanjing Desheng Silicone Materials Co., Ltd.

[0024] (b) The topcoat coating is applied to the transition layer surface using a 120-mesh anilox roller (anilox roller pressure: 0.4 MPa, coating speed: 100 m / min), and then fed into the drying channel of the coating machine at a rate of 100 m / min for drying (drying air velocity: 3.0 m / s, drying temperatures: 80℃, 90℃, 100℃, 90℃, 80℃, drying time: 15 s), forming the topcoat (coating dry weight: 15 g / m²). 2 ); Cool to room temperature, rewind, and you will get printable windowed security cardstock (such as...). Figure 1 (As shown).

[0025] The topcoat coating is composed of the following raw materials by weight percentage: 40.5% modified starch, 55% polyvinyl alcohol fiber, 1.2% leveling agent, 0.5% water-resistant agent, 0.95% wax emulsion, 0.4% surfactant, 0.7% thickener, 0.15% abrasion resistant agent, 0.1% silica, and the balance is defoamer.

[0026] The modified starch was corn modified starch, purchased from Leshengyuan Biotechnology (Nanjing) Co., Ltd., model Y03; the polyvinyl alcohol fiber was purchased from Shenzhen Boshun Chemical Co., Ltd., model SS-40; the leveling agent was polymethylphenylsiloxane leveling agent, purchased from Jiangsu Longen Chemical New Material Co., Ltd., model DC556; the water-resistant agent was water-resistant agent ZN-618A (polyamide polyurea water-resistant agent), purchased from Zhejiang Zhongnuo New Material Technology Co., Ltd.; the wax emulsion was oxidized polypropylene wax emulsion, purchased from Zhejiang Zanyu Technology Co., Ltd., model E-842N; the surfactant was compound surfactant ABS (alkylbenzene sulfonate). The following materials were purchased from Suzhou Feihe New Materials Co., Ltd.: Thickener was a mixture of propylene glycol alginate and polyoxyethylene in a mass ratio of 3:4; propylene glycol alginate was purchased from Hebei Qiansheng Biotechnology Co., Ltd. (model PGA-1); polyoxyethylene was purchased from Jiangsu Caiwei Biotechnology Co., Ltd. (model AC-1200); wear-resistant agent was a silicone-modified wear-resistant agent purchased from Shanghai Youci New Materials Co., Ltd. (model KR480); silica was purchased from Hubei Huifu Nanomaterials Co., Ltd. (model HL-200); defoamer was silicone defoamer BYK-065 purchased from Nanjing Desheng Silicone Materials Co., Ltd.

[0027] Comparative Example 1

[0028] Cardboard was prepared according to the method in Example 1, except that only the transition layer was coated.

[0029] Comparative Example 2

[0030] Cardboard was prepared according to the method in Example 1, except that only the surface coating was applied.

[0031] Comparative Example 3

[0032] Cardboard was prepared according to the method in Example 1, except that no modified starch was added to the transition layer coating.

[0033] Comparative Example 4

[0034] Cardboard was prepared according to the method in Example 1, except that polyvinyl alcohol fibers were not added to the transition layer coating.

[0035] Comparative Example 5

[0036] Cardboard was prepared according to the method in Example 1, except that no casein was added to the transition layer coating.

[0037] Comparative Example 6

[0038] Cardboard was prepared according to the method in Example 1, except that no modified starch was added to the top coating.

[0039] Comparative Example 7

[0040] Cardboard was prepared according to the method in Example 1, except that polyvinyl alcohol fibers were not added to the top coating.

[0041] Performance testing:

[0042] (1) The light transmittance, paper deformation, and box-forming stability of the cardboard in Example 1 and Comparative Examples 1-7 were tested respectively. (The light transmittance test method is to observe with the naked eye whether the window line and the micro-text on the window line are clearly visible. The paper deformation test method is to cut a 100mm×100mm sample, balance it for 24 hours at 23℃ and 50% relative humidity, and then place it freely on a horizontal platform. The maximum vertical distance of the corner of the sample from the platform is measured with a ruler. The upward tilt height is ≤3mm and the downward tilt height is ≤3mm. The box-forming stability test method is to fold the cardboard to be tested into a standard square box according to the printing crease, balance it in an environment at 23℃ and 50% relative humidity for 48 hours, and then measure the maximum inner angle of the box. The box is considered qualified if the crease is 90 degrees without deformation.) The results are shown in the table below.

[0043]

[0044] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A production process for printable windowed anti-counterfeiting cardstock, characterized in that, The transition layer coating is applied to one side of the windowed anti-counterfeiting cardstock base paper and dried to obtain the transition layer; the top coating coating is applied to the surface of the transition layer and dried to obtain the top coating; after cooling and winding, printable windowed anti-counterfeiting cardstock is obtained. The transition layer coating is made by mixing modified starch, polyvinyl alcohol fiber, casein, leveling agent, penetrant, water-resistant agent, quick-drying agent, and defoamer; The topcoat is made by mixing modified starch, polyvinyl alcohol fiber, leveling agent, water-resistant agent, wax emulsion, surfactant, thickener, abrasion resistant agent, silica, and defoamer.

2. The production process of a printable windowed anti-counterfeiting cardboard according to claim 1, characterized in that, The dry weight of the transition layer coating is 12-15 g / m². 2 .

3. The production process of a printable windowed anti-counterfeiting cardboard according to claim 1, characterized in that, The dry weight of the topcoat is 11-16 g / m². 2 .

4. The production process of a printable windowed anti-counterfeiting cardboard according to claim 1, characterized in that, Based on 100% of the total mass of the transition layer coating raw materials, the transition layer coating is made from the following raw materials by mass percentage: modified starch 20-32%, polyvinyl alcohol fiber 15-44%, casein 20-30%, leveling agent 0.5-5%, penetrant 0.5-3%, water-resistant agent 0.5-2.5%, quick-drying agent 0.5-1%, and the balance is defoamer.

5. The production process of a printable windowed anti-counterfeiting cardboard according to claim 1, characterized in that, Based on 100% of the total mass of the raw materials for the topcoat, the topcoat is made from the following raw materials by mass percentage: 30-45% modified starch, 50-60% polyvinyl alcohol fiber, 0.5-5% leveling agent, 0.2-2.5% water-resistant agent, 0.3-3% wax emulsion, 0.2-1.5% surfactant, 0.5-3% thickener, 0.1-4% abrasion resistant agent, 0.1-0.8% silica, and the balance being defoamer.

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