Corrugated watermark printing water-based ink, printing method and application thereof

Abstract

The present application relates to a kind of corrugated watermark printing water-based ink, printing method and its application, ink includes following components: colorant, ethanol, alkali, water-soluble acrylic resin, auxiliary and water.The above-mentioned corrugated watermark printing water-based ink, water-soluble resin uses water-soluble acrylic resin, and uses the connection of ethanol, alkali, auxiliary and water, especially using water to replace the toxic organic solvent of 30%~70% in traditional ink, can improve environmental protection and safety.Corrugated watermark printing water-based ink using the above-mentioned component, can make that ink performance is better, printing performance is good, and printing quality is stable.Especially in combination with the corrugated watermark printing method of the present application, can improve printing quality, solve the problem that "obvious light and shade different feeling, ink skin and paper powder paper hair, upper and lower printed matter is prone to ink adhesion, separate after forming pattern on printed matter even large area white spot phenomenon" when printing.

Description

TECHNICAL FIELD

[0001] The application relates to the field of corrugated watermark printing, in particular to a corrugated watermark printing water-based ink, a printing method and application thereof. BACKGROUND

[0002] In recent years, with the continuous development of science and technology and the emphasis on environmental protection, corrugated watermark printing is applied to the packaging of various products due to its environmental protection, super plasticity, superior cost performance, and is expected to maintain a sustained growth trend in the next few years. With the upgrading and development of technology and continuous efforts in innovation, the quality of corrugated watermark related products is getting better and better, and is widely applied and loved by people, thereby promoting the sustained growth of the market scale.

[0003] In order to continuously meet the needs of the market, the current corrugated watermark has the following technical development trends. First, printing manufacturers use higher quality materials and production processes to improve product quality stability, durability and aesthetics. Second, corrugated watermark manufacturers use water-based environmentally friendly ink to eliminate environmental pollution. The updated counterweight system, intelligent color matching system and other technical innovations also make the print quality higher and higher, so that it is more and more applied to the packaging of high-end products.

[0004] However, the current corrugated watermark printing technology is prone to various quality abnormalities in large-area solid printing. The following problems are prone to occur during printing: obvious difference in light and shade, ink skin and paper powder, ink marks are prone to stick together on the upper and lower printed products, and patterns are formed on the printed products after separation, and even large-area white spots are generated. SUMMARY

[0005] Therefore, it is necessary to provide a corrugated watermark printing water-based ink, a printing method and application thereof, which have good environmental protection, can improve print quality, and solve the problems of "obvious difference in light and shade, ink skin and paper powder, ink marks are prone to stick together on the upper and lower printed products, and patterns are formed on the printed products after separation, and even large-area white spots are generated" during corrugated watermark printing.

[0006] A corrugated watermark printing water-based ink comprises the following components: colorant, ethanol, alkali, water-soluble acrylic resin, additive and water.

[0007] In one embodiment, the corrugated watermark printing water-based ink comprises the following components in the following mass percentages: colorant 18%-30%, ethanol 7%-9%, alkali 4%-6%, water-soluble acrylic resin 25%-35%, additive 0.5%-13%, and water 25%-39%.

[0008] In one embodiment, the auxiliary agent includes at least one of propylene glycol monobutyl ether, defoaming agent, fast drying agent, dispersant and wetting agent, and slow drying agent.

[0009] In one embodiment, the auxiliary agent includes at least one of propylene glycol monobutyl ether, defoaming agent, fast drying agent, dispersant and wetting agent, and slow drying agent.

[0010] In one embodiment, the water includes 10% to 14% of deionized water.

[0011] In one embodiment, the viscosity of the corrugated watermark printing water-based ink is 15 to 25 Pa·s.

[0012] In one embodiment, the corrugated watermark printing water-based ink is prepared by mixing and grinding the components.

[0013] In a second aspect, the application provides a corrugated watermark printing method, including the following steps:

[0014] Providing a corrugated paperboard;

[0015] The printing machine uses a flexographic plate and corrugated watermark printing water-based ink to perform watermark printing on the corrugated paperboard, wherein the corrugated watermark printing water-based ink is the corrugated watermark printing water-based ink as described in any one of the above embodiments.

[0016] In one embodiment, the corrugated paperboard is an E-flute corrugated paperboard.

[0017] In one embodiment, the corrugated paperboard includes a 230g face layer of kraft paper, a 120g middle layer of core paper, and a 160g bottom layer of kraft paper arranged in sequence.

[0018] In one embodiment, the water content of the corrugated paperboard is 7% to 12%.

[0019] In one embodiment, the Shore hardness of the flexographic plate is 25 to 40.

[0020] In one embodiment, the flexographic plate includes a polyester support film, a photosensitive resin layer, and a polyester protective layer arranged in sequence.

[0021] In one embodiment, the flexographic plate is a solid plate without screen dots.

[0022] In one embodiment, the flexographic plate is a 45-degree 30% round screen dot complementary plate.

[0023] In one embodiment, the printing pressure of the printing machine is 0.1-0.13 MPa.

[0024] In one embodiment, the printing machine has a production environment temperature of 20-35°C and a production environment humidity of 50-60% during printing.

[0025] In a third aspect, the application also provides a Warren watermark packaging product printed on a corrugated paperboard using the Warren watermark printing method according to any one of the above embodiments.

[0026] The Warren watermark printing water-based ink uses a water-soluble acrylic resin as the water-soluble resin, and uses ethanol, alkali, additives and water, especially water, to replace the 30-70% toxic organic solvents in traditional inks, thereby improving environmental protection and safety. The Warren watermark printing water-based ink using the above components has excellent ink performance, good printing performance and stable printing quality. In particular, in combination with the Warren watermark printing method of the application, the printing quality is improved, and the problems of "obvious difference in lightness, ink skin and ink residue, paper powder and paper hair, ink smearing on the upper and lower printed products, and pattern formation or even large-area white spots after separation" during Warren watermark printing are solved. According to the requirements of printing production conditions, the adhesion, wear resistance, visual color uniformity and hiding power of the printed product sample are tested, and the results show that the printed product has stable performance on the printing paper, good gloss, wear resistance, avoids high temperature and sunlight, and has a shelf life of one year at room temperature. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Single-plate printing effect diagram of the screen dot flexographic plate of the Warren watermark printing method of one embodiment;

[0028] Figure 2 Single-plate printing effect diagram of the solid flexographic plate of the Warren watermark printing method of one embodiment;

[0029] Figure 3 Solid + screen dot printing effect diagram of the Warren watermark printing method of one embodiment. DETAILED DESCRIPTION

[0030] For the purpose of promoting an understanding of the application, the above-mentioned and various other objects and advantages of the present application will be more fully understood from the following detailed description, taken in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, it will be obvious to those skilled in the art that the present application can be practiced without such specific details. In other instances, well-known methods have not been described in detail in order not to unnecessarily obscure the present application. Also, the purpose of the accompanying drawings is to aid in understanding the present application. It should be noted, that the description and drawings merely illustrate the principles of the present application. Other arrangements, which will be apparent to those skilled in the art, can be employed in the practice of the application, without departing from the spirit and scope of the application. Like reference numerals are used to describe like elements throughout this disclosure. The use of the terms "first", "second", etc. do not denote any order, quantity, combination or importance, but rather are used to nomenclature different elements. Therefore, these terms are used herein merely to describe different elements. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. The use of the terms "a" and "an" and "the" and "said" herein is not intended to be singular or to limit the described implementation to a single element unless specifically so defined. The use of the term "at least one" is intended to mean one or more but not necessarily including more than one. The use of the term "one" is intended to mean a singular entity or quantity but not necessarily excluding more than one. The use of the term "plurality" is intended to mean a number greater than one. The use of the term "set" is intended to mean one or more. The use of the term "or" is intended to mean either one, both, or any combination thereof. The use of the term "and" is intended to mean both. The use of the term "and / or" is intended to mean either one, both, or any combination thereof. The use of the term "based on" is intended to mean based, at least in part, on. The use of the terms "first", "second", "third", etc. are not intended to denote any order, quantity, combination, or importance, but rather are used to nomenclature different elements. Therefore, these terms are used herein merely to describe different elements. The use of the terms "comprising", "including", "containing", "characterized by", "comprised of", "having", "including", "carrying", "having", "containing", "involving", and "characterized by" or any other variation thereof, are intended to be open ended. The use of the terms "comprising", "including", "containing", "characterized by", "comprised of", "having", "including", "carrying", "having", "containing", "involving", and "characterized by" or any other variation thereof, are intended to be open ended. The use of the terms "comprising", "including", "containing", "characterized by", "comprised of", "having", "including", "carrying", "having", "containing", "involving", and "characterized by" or any other variation thereof, are intended to be open ended.

[0031] A corrugated watermark printing water-based ink, comprising the following components: colorant, ethanol, alkali, water-soluble acrylic resin, auxiliary agent, and water.

[0032] The corrugated watermark printing water-based ink uses water-soluble acrylic resin as the water-soluble resin, and uses ethanol, alkali, additives and water, especially water, to replace the 30% to 70% toxic organic solvents in traditional inks, so as to improve environmental protection and safety. The corrugated watermark printing water-based ink with the above components has good ink performance, good printing performance and stable printing quality. In particular, in combination with the corrugated watermark printing method of the present application, the printing quality is improved, and the problems of "obvious difference in lightness, ink skin and paper powder, ink marks sticking together in stacked printed products, and patterns formed on the printed products after separation, and even large-area white spots" are solved. The printed product samples are tested for adhesion, wear resistance, visual color uniformity and hiding power according to the requirements of printing production conditions. The test shows that the printed product has stable performance, good gloss, wear resistance, avoids high temperature and sunlight, and has a shelf life of one year at room temperature. For example, the alkali is sodium hydroxide.

[0033] In one embodiment, the corrugated watermark printing water-based ink includes the following components in mass percentage: colorant 18% to 30%, ethanol 7% to 9%, alkali 4% to 6%, water-soluble acrylic resin 25% to 35%, additives 0.5% to 13%, and water 25% to 39%. For example, the additives include at least one of propylene glycol butyl ether, defoaming agent, fast-drying agent, dispersant and wetting agent, and slow-drying agent. For example, the additives in mass percentage of 0.5% to 13% include: water-based wax 0.5% to 1%, propylene glycol butyl ether 1% to 2%, defoaming agent 1% to 2%, fast-drying agent 2-3%, dispersant and wetting agent 0.5% to 3%, and slow-drying agent 1-2%. In this way, the corrugated watermark printing water-based ink with the above components in mass percentage can further improve the printing quality of the product, and after printing, there will be no obvious difference in lightness, no ink skin and paper powder, no ink marks sticking together in stacked printed products, and no patterns and white spots formed on the printed products after separation, so the printing quality is good. For example, the defoaming agent can be an organic silicon-based, polyether-based or polysilicone-based defoaming agent. For example, the fast-drying agent can be ethyl acetate or calcium chloride, the dispersant and wetting agent can be polyacrylate or polyurethane, and the slow-drying agent can be an acrylic substance. Of course, it should be noted that the defoaming agent, fast-drying agent, slow-drying agent, dispersant and wetting agent can also use common similar substances in the art.

[0034] In one embodiment, the water with a mass percentage of 25%-39% comprises: deionized water 10%-14%; in this way, by simultaneously using 10%-14% deionized water and the balance of ordinary water, the ordinary water is used as a solvent and dispersant in the ink manufacturing process, which can help the ink to better dissolve and disperse pigments. In addition, ordinary water can also adjust the viscosity and flowability of the ink to meet the requirements of the printing machine. By using 10%-14% deionized water, the deionized water is mainly used as a diluent and regulator in ink manufacturing, which can help reduce the viscosity of the ink, making it have good flowability and wettability, in addition, deionized water can also help control the drying speed and printing suitability of the ink.

[0035] In one embodiment, the viscosity of the corrugated watermark printing water-based oil ink is 15-25 Pa·s; in this way, in combination with the above-mentioned mass percentage of each component, the ink viscosity is 20±5 s, the printing performance is better, the ink performance is better, and the printing quality is more stable.

[0036] In one embodiment, the pH value of the alkali-soluble acidic resin is 8.5-9.5.

[0037] In one embodiment, the corrugated watermark printing water-based ink is prepared by mixing and grinding the components. In other words, the corrugated watermark printing water-based ink of the present application can be prepared based on the corrugated watermark printing water-based ink after grinding.

[0038] In a second aspect, the present application provides a corrugated watermark printing method, comprising the following S110 and S120 steps, specifically comprising the following:

[0039] S110: providing a corrugated paperboard;

[0040] In this embodiment, the corrugated watermark printing method is based on the corrugated paperboard for printing, in order to further improve the printing effect, preferably, the corrugated paperboard is E-knot corrugated paperboard; for example, the corrugated paperboard comprises a 230g face layer of kraft paper, a 120g intermediate layer of core paper and a 160g bottom layer of kraft paper arranged in sequence; for example, the water content of the corrugated paperboard is 7%-12%. In this way, the applicant found that by using the above corrugated paperboard, the subsequent watermark printing effect is relatively good. When the E-knot paperboard is selected, the printing surface is smooth and clean, and the paperboard has a water content of 7%-12%, the strength and printing effect of the paperboard are the strongest and smoothest.

[0041] S120: the printing machine uses a flexographic plate, corrugated watermark printing water-based ink to perform watermark printing on the corrugated paperboard, wherein the corrugated watermark printing water-based ink is the corrugated watermark printing water-based ink as described in any one of the above embodiments.

[0042] In the embodiment, by using the flexible plate and combining the corrugated watermark printing water-based ink as described in any of the above embodiments, the water-soluble resin uses water-soluble acrylic resin, and ethanol, alkali, additives and water are used, especially water is used to replace 30% to 70% of toxic organic solvents in traditional inks, which can improve environmental protection and safety. The corrugated watermark printing water-based ink with the above components can have better ink performance, better printing performance and stable printing quality. Especially combined with the corrugated watermark printing method of the present application, the printing quality can be improved, and the problems of "obvious difference in lightness, ink skin and paper powder, ink marks of upper and lower printed products are prone to stick together, and patterns are formed on the printed products after separation, even large area white spot phenomenon" during corrugated watermark printing. According to the requirements of printing production conditions, the adhesion, wear resistance, visual printing color uniformity and hiding power effect of the printed sample are tested. The printed product has stable performance, good gloss, wear resistance, avoids high temperature and sunlight, and has a storage period of one year at room temperature. For example, the alkali is sodium hydroxide.

[0043] In one embodiment, the Shore hardness of the plate material of the flexible plate is 25-40; thus, using the flexible plate with the above Shore hardness, the printing is better, and the problems of "obvious difference in lightness, ink skin and paper powder, ink marks of upper and lower printed products are prone to stick together, and patterns are formed on the printed products after separation, even large area white spot phenomenon" can be further solved. For example, the flexible plate includes a polyester support film, a photosensitive resin layer and a polyester protective layer arranged in sequence; thus, using the above flexible plate can further improve the printing quality. For example, the flexible plate is a solid plate without screen dots; for example, the flexible plate is a 45-degree 30% round screen dot complementary plate. For example, the flexible plate uses a two-set flexible plate multi-color printing machine, and the two sets of flexible plates are a solid plate without screen dots and a 45-degree 30% round screen dot complementary plate. It should be noted that the conventional single plate solid printing often has various quality problems such as spots, white spots, poor hiding power, color difference, etc. After adding the 45-degree 30% round screen dot complementary plate through repeated experiments, the overall printing effect is the best, and the printing color is uniform and stable without being dull.

[0044] In one embodiment, the printing pressure of the printing machine during printing is 0.1-0.13 Mpa. The applicant found that when the printing machine is measured on the E pit plate, the product quality is the best when the pressure value is in the range of 0.1-0.13, the ink is flat, and the ink is solid.

[0045] In one of the embodiments, the printing machine has a production environment temperature of 20-35°C and a production environment humidity of 50-60% during printing. In this way, by installing a humidifier, an air conditioner, and a temperature and humidity control system to adjust the temperature range to the above values, the adhesion, fullness, and wear resistance of the printed product are the best.

[0046] The corrugated watermark printing method based on the corrugated watermark printing water-based ink has the water-soluble resin using a water-soluble acrylic resin, and uses ethanol, alkali, an additive, and water, and especially uses water to replace 30-70% of the toxic organic solvent in the traditional ink, so that the environmental protection and safety can be improved. The corrugated watermark printing water-based ink using the above components can have better ink performance, better printing performance, and stable printing quality. Especially in combination with the corrugated watermark printing method of the present application, the printing quality can be improved, and the problems of "obvious difference in lightness, ink skin and paper powder, paper hair, and ink marks easily sticking together on the upper and lower printed products, and forming patterns or even large-area white spots after separation" during corrugated watermark printing can be solved. The printed product samples are subjected to adhesion, wear resistance, visual color uniformity, and hiding power effect according to the requirements of printing production conditions. The printed product has stable performance, good gloss, wear resistance, avoids high temperature and sunlight, and has a normal temperature storage period of one year.

[0047] In a third aspect, the present application also provides a corrugated watermark packaging product, which is printed on corrugated paperboard by using the corrugated watermark printing method according to any one of the above embodiments.

[0048] In order to further illustrate the corrugated watermark printing method of the present application, the specific embodiments are further described below.

[0049] Example 1

[0050] After multiple tests on the main influencing factors such as ink, flexographic plate, printing material, printing machine pressure, production environment temperature and humidity, etc. for full-area solid printing of watermarks, the best values are found to meet the performance targets set by the project. See the following effect analysis table for details:

[0051] (1) Analysis of characteristics of each influencing factor

[0052] Table 1 Main factors affecting the quality of corrugated watermark printing

[0053]

[0054] In order to achieve better printing effect, through actual production and multiple verifications, E-knot corrugated paperboard with good burst strength is selected, and 230g high-quality cow paper is used as the base paper, 120g core paper, and 160g high-quality cow card. When each influencing factor reaches the following values, the effect is the best.

[0055] Table 2. Results of each main factor obtained in Example 1

[0056]

[0057] After the field printing test in pit E was qualified, the printing sample was subjected to adhesion, wear resistance, visual printing color uniformity and hiding power effect according to the requirements of printing production conditions. The printing on the printing paper has stable performance, good gloss, wear resistance, avoids high temperature and sunlight, and has a storage period of one year at room temperature. Table 3 is the test results of this example.

[0058] Table 3. Printing test results of Example 1

[0059]

[0060] Please refer to Figure 1 , Figure 1 is the single-plate printing effect diagram of the dot version flexographic plate of Example 1, Figure 2 is the single-plate printing effect of the solid version flexographic plate of Example 1, Figure 3 is the printing effect of the solid version + dot version of Example 1.

[0061] In addition, the printing sample of the present application is placed under a standard light source and visually identified by a spectrodensitometer. The test method is as follows: 1. Place the sample under the standard light source and visually identify it; 2. Calibrate the instrument with a white standard disc, select the test item on the menu key and test it. The test result is that the printed surface is clean, the ink color is thick and solid, the color is full, the graphics are clear, and it meets the standard.

[0062] The wear resistance test process of the present application is as follows: 1. Remove the upper friction body from the instrument, cut a white paper 50*170mm, and fix the white paper strip tightly on the upper friction body (rubber surface); 2. Fix the test sample on the upper surface of the lower friction body, with the printed surface facing up; 3. Fix the upper friction block wrapped with white paper on the transmission arm, and place a 4LB weight on it; 4. Open the counter box, set the friction frequency to 1000 times, adjust the speed regulator to make the friction speed 43 times / min, press the start switch, and the friction starts until the friction frequency reaches the set frequency and stops automatically, and refer to the comparison color sample. The test result is that after 300 times of friction, the ink layer does not expose the base color of the substrate, and it is qualified. The wear resistance test standard refers to GB / T 7706-2008.

[0063] As can be seen, the corrugated watermark printing water-based ink and the corrugated watermark printing method based thereon provided by the present application have the advantages that the printed surface is clean, the ink color is thick and solid, the color is full, the graphics are clear, and it meets the standard, and after 300 times of friction test, the ink layer does not expose the base color of the substrate and does not fade.

[0064] The corrugated watermark printing method based on the corrugated watermark printing water-based ink, the water-soluble resin adopts the water-soluble acrylic resin, and the ethanol, the alkali, the auxiliary agent and the water are connected, especially the water is used to replace the toxic organic solvent accounting for 30% to 70% in the traditional ink, which can improve the environmental protection and safety. The corrugated watermark printing water-based ink with the above components can make the ink performance better, the printing performance better, and the printing quality stable. Especially combined with the corrugated watermark printing method of the application, the printing quality can be improved, and the problems of "obvious difference in light and shade, ink skin and paper powder, upper and lower printed products are prone to ink adhesion, and after separation, patterns are formed on the printed products, even large area white spot phenomenon" during corrugated watermark printing can be solved. According to the printing production condition requirements, the printed product sample is subjected to adhesion, wear resistance, visual printing color uniformity and hiding power effect. The performance of printing on the printing paper is stable, the gloss is good, the wear resistance is good, the high temperature and the sun radiation are avoided, and the normal temperature storage period is one year.

[0065] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application. It should be noted that the "in an embodiment of the present application", "for example", "such as" and the like of the present application are intended to illustrate the present application, and are not used to limit the present application. The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A corrugated watermark printing method, characterized in that, Includes the following steps: Corrugated cardboard is provided; wherein the corrugated cardboard comprises a 230g top kraft paper, a 120g middle core paper, and a 160g bottom kraft paper arranged sequentially; the moisture content of the corrugated cardboard is 7%-12%; The printing press uses flexographic printing and corrugated water-based printing ink to perform water-based printing on corrugated cardboard. The corrugated water-based printing ink comprises the following components by weight percentage: pigment 18%-30%, ethanol 7%-9%, alkali 4%-6%, water-soluble acrylic resin 25%-35%, water-based wax 0.5%-1%, propylene glycol butyl ether 1%-2%, defoamer 1%-2%, fast-drying agent 2-3%, dispersant and wetting agent 0.5%-3%, slow-drying agent 1-2%, and water 25%-39%, wherein the 25%-39% water by weight includes 10%-14% deionized water. The viscosity of the water-based ink is... The corrugated water-based ink for water-based printing is prepared by mixing and grinding various components. The Shore hardness of the flexographic plate is 25-40. The flexographic plate includes a polyester support film, a photosensitive resin layer, and a polyester protective layer arranged in sequence. Two sets of flexographic plates are used: a solid plate without dots and a supplementary plate with 30% circular dots at 45 degrees. The printing pressure of the printing press is 0.1-0.13 MPa. The production environment temperature of the printing press is 20℃-35℃, and the production environment humidity is 50%-60%.

2. A corrugated watermarked packaging product, characterized in that, The corrugated watermarked packaging is printed on corrugated cardboard using the corrugated watermark printing method as described in claim 1.

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