阅读说明：本技术 预印液和瓦楞纸的印刷方法 (Preprinting liquid and printing method of corrugated paper ) 是由 肖能 刘颐中 梁日军 于 2021-07-06 设计创作，主要内容包括：本申请涉及油墨印刷技术领域,尤其涉及一种预印液和瓦楞纸的印刷方法。本申请的预印液包括如下重量百分含量的组分：定影耐水剂2％～15％；附着剂2％～20％；施胶剂0.1％～1％；粘溶剂1％～20％；其他助剂0.05％～1％；余下的为水。将本申请的预印液涂覆基材表面后,再印刷染料墨水,这样后续无需再对印刷表面进行后处理就可以提高其防水性能,因此这样的预印液用于染料墨水印刷不仅环保,而且使印刷步骤更加简易,同时也降低印刷成本。(The application relates to the technical field of ink printing, in particular to a printing method of preprinting liquid and corrugated paper. The preprinting liquid comprises the following components in percentage by weight: 2 to 15 percent of fixing water-proofing agent; 2 to 20 percent of adhesive; 0.1 to 1 percent of sizing agent; 1% -20% of a viscous solvent; 0.05 to 1 percent of other auxiliary agents; the remainder being water. After the preprinting liquid coats the surface of the substrate, the dye ink is printed, so that the waterproof performance of the substrate can be improved without post-treatment on the printing surface, and the preprinting liquid is not only environment-friendly when used for printing the dye ink, but also has simpler printing steps and simultaneously reduces the printing cost.)

1. The preprinting liquid is characterized by comprising the following components in percentage by weight based on 100% of the total weight of the preprinting liquid:

2. the preprint solution according to claim 1, wherein the fixing water-proofing agent is selected from a polyamide-based resin composition; and/or the presence of a gas in the gas,

the fixing water-resistant agent is at least one selected from DK6885, DK6804, DK6810 and D6850 of starlight PMC corporation, NS660K, NS 660K-II and NS 660K-III of Hangzhou Hua Harlima chemical Co.

3. The preprinting liquid of claim 1, wherein the adhesive is selected from at least one of polyvinyl alcohol, chitosan and starch.

4. The preprinting solution of claim 1, wherein the sizing agent is selected from styrene-acrylic surface sizing agents.

5. The preprinting liquid of claim 1, wherein the other auxiliary agents are selected from at least one of surfactants and wetting agents.

6. The pre-print solution of claim 1, wherein said visco-solvent includes alcohol visco-solvents and ether visco-solvents.

7. The preprinting liquid of claim 6, wherein the alcohol-based viscous solvent is at least one selected from ethylene glycol, propylene glycol, diethylene glycol and glycerol; and/or the presence of a gas in the gas,

the ether viscous solvent is at least one selected from diethylene glycol monobutyl ether and triethylene glycol butyl ether.

8. The preprinting liquid of any one of claims 1 to 7, wherein the preprinting liquid has a viscosity of 3.0 to 15.0 mPa-s and a surface tension of 20 to 45 mN/m.

9. A method of printing corrugated paper, comprising the steps of:

providing a corrugated cardboard;

applying the preprinting liquid of any one of claims 1 to 8 to the surface of the corrugated cardboard, drying, and then printing a dye ink.

10. A method of printing as in claim 9, wherein the preprinting liquid is applied to the surface of the corrugated paperboard sheet by brushing or spraying.

Technical Field

The application belongs to the technical field of ink printing, and particularly relates to a printing method of preprinting liquid and corrugated paper.

Background

The dye can be purely natural or artificially synthesized as a colorant, can exist in the ink in a single molecular form, is not easy to block a spray head when the dye ink is printed, and has certain limitation on the application because the dye ink has poor water resistance.

At present, most of ink used for corrugated paper is pigment ink, and the pigment ink has the defects of high cost, insufficient bright color, easy blockage, low drying speed and the like. With the continuous development of ink technology, the dye ink of corrugated paper has been applied to carton paperboard more and more, but the defects of poor waterproofness such as moisture resistance, rain resistance and the like still exist. In order to overcome the defect, many manufacturers spray-print dye ink on cardboard boxes, spray-print and dry the cardboard boxes, and then adopt a process of coating post-printing treatment fluid or waterproof gloss oil, and the post-printing treatment process has certain disadvantages, such as: the post-treatment can be carried out after the jet printing ink is dried, so that the process is time-consuming; the post-treatment is slightly improper, the operation is abandoned, and the cardboard of the carton can be scrapped.

Therefore, the related art is in need of improvement.

Disclosure of Invention

The application aims to provide a printing method of preprinting liquid and corrugated paper, and aims to solve the problem of poor water resistance of dye ink printing.

In order to achieve the purpose of the application, the technical scheme adopted by the application is as follows:

in a first aspect, the present application provides a preprinting liquid, which comprises the following components in percentage by weight, based on the total weight of the preprinting liquid as 100%:

the preprinting liquid provided by the application contains a certain amount of fixing water-resistant agent, adhesive, sizing agent, viscosity solvent, other auxiliary agents and water, can obviously improve the rainproof and moistureproof hydrophobic performances of the water-based dye ink on a substrate, and can avoid the phenomenon of color bleeding and edge blurring generated during printing of the dye ink, so that the definition of a printing contour is improved, and the color brightness is increased; after the preprinting liquid coats the surface of the substrate, the dye ink is printed, so that the waterproof performance of the substrate can be improved without post-treatment on the printing surface, and the preprinting liquid is not only environment-friendly when used for printing the dye ink, but also has simpler printing steps and simultaneously reduces the printing cost.

In a second aspect, the present application provides a method of printing corrugated paper, comprising the steps of:

providing a corrugated cardboard;

the preprinting liquid is coated on the surface of the corrugated paperboard, and is dried and then is printed with dye ink.

According to the printing method of the corrugated paper, the specific preprinting liquid is coated on the surface of the corrugated paper board, the dye ink is printed on the surface of the corrugated paper board after drying, so that the waterproof performance of the corrugated paper board can be improved without post-treatment on the printing surface, and the phenomenon of bleeding and halation generated during printing of the dye ink is avoided, so that the printing contour definition is improved, and the color brightness is increased. Therefore, the printing method is environment-friendly, the printing steps are simpler, the cost is low, and the printing method has a good application prospect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a graph comparing the wetting effect of examples of the present application and comparative examples;

FIG. 2 is a graph comparing the wetting effect of examples of the present application and comparative examples;

FIG. 3 is a clear comparative graph of jet printing of examples and comparative examples of the present application;

FIG. 4 is a graph showing the water repellency effect of the example of the present application compared to that of an uncoated preprinting liquid;

FIG. 5 is a graph comparing the color density effect of examples of the present application and an uncoated preprinting liquid;

FIG. 6 is a graph showing the effect of color enhancement of the examples of the present application in comparison with that of an uncoated preprinting liquid.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application more clearly apparent, the present application is further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In this application, the term "and/or" describes an association relationship of associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a is present alone, A and B are present simultaneously, and B is present alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. In the present application, "at least one" means one or more, "plural" means two or more.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The weight of the related components mentioned in the description of the embodiments of the present application may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present application as long as it is scaled up or down according to the description of the embodiments of the present application. Specifically, the mass described in the specification of the embodiments of the present application may be a mass unit known in the chemical industry field such as μ g, mg, g, kg, etc. The normal temperature of the application means 25 to 27 ℃.

In a first aspect, the embodiment of the present application provides a preprinting liquid, which comprises the following components, by weight, based on 100% of the total weight of the preprinting liquid:

the preprinting liquid provided by the embodiment of the application contains a certain amount of fixing water-resistant agent, adhesive, sizing agent, viscous solvent, other auxiliary agents and water, and specifically, the preprinting liquid comprises the following components in percentage by weight: 2 to 15 percent of fixing water-proofing agent, 2 to 20 percent of adhesive, 0.1 to 1 percent of sizing agent, 1 to 20 percent of viscosity solvent, 0.05 to 1 percent of other auxiliary agent and the balance of water. The preprinting liquid can obviously improve the rain-proof and moisture-proof hydrophobic performance of the water-based dye ink on a substrate through the interaction of the components with the contents, and can avoid the phenomenon of color bleeding and edge blurring generated during the printing of the dye ink, thereby improving the definition of the printing contour and increasing the color brilliance; after the preprinting liquid coats the surface of the substrate, the dye ink is printed, so that the waterproof performance of the substrate can be improved without post-treatment on the printing surface, and the preprinting liquid is not only environment-friendly when used for printing the dye ink, but also has simpler printing steps and simultaneously reduces the printing cost.

In one embodiment, the fixing water-resistant agent in the preprinting liquid is selected from a polyamide-based resin composition; the fixing water-resistant agent can endow the fixing water-resistant agent with rubbing resistance and water resistance, and also has the characteristics of yellowing resistance and color brightness improvement. Further, the fixing water-resistant agent is selected from at least one of DK6885, DK6804, DK6810 and D6850 manufactured by japan starlight PMC corporation (see specifically official gazette of japan starlight PMC corporation), NS660K, NS 660K-ii and NS 660K-iii of hangzhong hua li ma chemical ltd. The fixing water resistant agent content in the preprinting liquid can be 2%, 5%, 8%, 10%, 12%, 15% and the like.

In one embodiment, the adhesive in the preprinting liquid is selected from at least one of polyvinyl alcohol, chitosan, and starch. The adhesive agent can uniformly and firmly distribute the coloring material in the dye ink, and effectively inhibit phenomena such as permeation, edge halo and the like. Further, the adhesive agent is preferably polyvinyl alcohol (PVA), and may be one or more selected from VP-18E of JVP, PVA-205 of Coly corporation, PVA17-92 and 17-88 of Anhui Wei group, China, PVA-0588 of Taiwan Changchun corporation, and the like. The content of the adhesive in the preprinting liquid can be 2%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, etc.

In one embodiment, the sizing agent in the preprinting liquid is selected from styrene-acrylic surface sizing agents. The sizing agent plays a role in enhancing pressure resistance, preventing deformation and the like in a system, and can be selected from XY-0002 of Qingdao Xiangyu chemical engineering Co., Ltd, JH-611 of Jinhada brand of Qingzhou Jinhao Industrial and trade Co., Ltd, and RG-B series of Weifang Rui optical chemical industry Co., Ltd. The content of the sizing agent in the preprinting liquid can be 0.1%, 0.2%, 0.5%, 0.8%, 1% and the like.

In one embodiment, the other adjuvants in the pre-print liquid are selected from at least one of surfactants and humectants. The auxiliary agent can effectively reduce the surface tension of the system, so that the system can well wet corrugated paper base materials and can inhibit and defoam foams; further, the surfactant may be selected from the group consisting of GS-A301E, GS-4100 adjuvant, adjuvant of gamma chemistry (New Gamma chemistry, Zhejiang, Ltd.), adjuvant of surfynol 960surfactant of gas Co., Ltd., and the like; the humectant can be at least one selected from Fule T86 adjuvant of New Tianjin Hefphel material Co., Ltd, hydralat 140 and WE3220 adjuvant of Germany Corning. The content of the other additives in the preprinting solution can be 0.05%, 0.1%, 0.3%, 0.5%, 0.8%, 1%, etc.

In one embodiment, the viscosity solvent in the pre-printing liquid includes alcohol viscosity solvent and ether viscosity solvent. Further, a combination of an alcohol type viscosolvent and an ether type viscosolvent may be used. The alcohol solvent can adjust the viscosity of the system, has strong moisturizing effect and good fluidity, and can be used together with the ether solvent to make up for the disadvantage of poor moisturizing effect of the ether solvent. The alcohol viscous solvent is selected from monohydric alcohol or dihydric alcohol with low carbon chain (such as 1-6 carbon atoms), such as at least one of ethylene glycol, propylene glycol, diethylene glycol and glycerol. The ether viscous solvent is matched with the selected alcohol viscous solvent well, so that the system smoothness is better, the wetting effect of the system on a substrate can be enhanced, the adhesive and the sizing agent which are not easy to wet can be finely and uniformly spread, and the ether viscous solvent is selected from at least one of diethylene glycol monobutyl ether and triethylene glycol butyl ether. The combination of the alcohol-based and ether-based viscolyzing agents described above provides the most effective viscolyzing agent. The content of the tacky solvent in the preprinting liquid can be 1%, 5%, 8%, 10%, 12%, 15%, 18%, 20%, and the like.

In one embodiment, the preprinting liquid has a viscosity of 3.0 to 15.0mPa · s and a surface tension of 20 to 45 mN/m. Because the preprinting liquid has the spraying property, the high or low viscosity is not beneficial to the spraying of the industrial spray head; on the other hand, in view of the convenience of the application, the viscosity of the preprinting liquid of the present application is preferably controlled to be 3.0 to 15.0 mPas (30 ℃ C.).

In one embodiment, the water in the pre-printing liquid is deionized water.

The preprinting liquid provided by the embodiment of the application can be used for various substrate surfaces, such as but not limited to corrugated paper dye ink, and can be coated or sprayed before printing; the waterproof performance of the corrugated paper water-based dye ink on a base material can be obviously improved; the occurrence of color bleeding and edge shading during printing is avoided, and the definition of the printing contour is improved; the color brightness is increased; the preprinting liquid is used for pretreating the base material before the digital printing of the corrugated paper dye ink, and after the digital printing of the corrugated paper dye ink, the printing post-treatment such as water-proof gloss oil coating is needed, so that the process is simple and easy, the environment is protected, and the printing cost can be reduced.

The preparation method of the preprinting liquid can comprise the following steps: mixing the fixing water-proofing agent, the adhesive, the sizing agent, the viscous solvent, other auxiliary agents and water, and then filtering to obtain the preprinting liquid. Specifically, firstly, the viscous solvent, other auxiliary agents and water are fully mixed and stirred, then the sizing agent, the fixing water-resistant agent and the adhesive are added and fully stirred, and finally, a secondary precise filtering system with the pore diameter of 0.45 mu m and the pore diameter of 0.22 mu m is used for filtering, so that the preprinting liquid is obtained.

In a second aspect of the embodiments of the present application, there is provided a method for printing corrugated paper, including the following steps:

s01: providing a corrugated cardboard;

s02: the preprinting liquid of the embodiment of the application is coated on the surface of corrugated paperboard, is dried and is printed with dye ink.

According to the printing method of the corrugated paper, the special preprinting liquid in the embodiment of the application is coated on the surface of the corrugated paper board, and the dye ink is printed on the surface of the corrugated paper board after drying, so that the waterproof performance of the corrugated paper board can be improved without post-treatment on the printing surface subsequently, and the phenomenon of bleeding and edge blurring generated in the printing process of the dye ink is avoided, so that the definition of the printing contour is improved, and the color vividness is increased. Therefore, the printing method provided by the embodiment of the application is environment-friendly, the printing steps are simpler, the cost is low, and the application prospect is good.

The following description will be given with reference to specific examples.

Example 1

A preprinting liquid is prepared by the following preparation method:

sequentially adding: viscous solvent (diethylene glycol + diethylene glycol monobutyl ether, 3g each), 1g surfactant (GS-4100), 0.1g humectant (hydropalat 140), 82.6g deionized water, stirring thoroughly at normal temperature of 90-110rpm for 20min, adding 0.3g sizing agent (JH-611), 6g fixing water resisting agent (DK6885), 4g adhesive agent (PVA-0588), stirring thoroughly at normal temperature of 90-190rpm for 30min, and filtering with secondary precise filtration system with pore diameters of 0.45 μm and 0.22 μm respectively to obtain the preprinting liquid.

Example 2

A preprinting liquid is prepared by the following preparation method:

sequentially adding: the preprinting solution is prepared by the steps of fully stirring a viscous solvent (propylene glycol and diethylene glycol monobutyl ether, 2g of each), 0.8g of wetting agent (T86), 0.05g of surfactant (surfynol 960surfactant), 82.75g of deionized water at normal temperature of 90-110rpm for 20min, fully mixing the components uniformly, then adding 0.4g of sizing agent (JH-611), 8g of fixing water-resistant agent (DK6885), 4g of adhesive (PVA 17-92), fully stirring the components at normal temperature of 90-190rpm for 30min, and finally filtering the mixture by a secondary precise filtering system with the pore diameters of 0.45 mu m and 0.22 mu m respectively to obtain the preprinting solution.

Example 3

A preprinting liquid is prepared by the following preparation method:

sequentially adding: the preparation method comprises the following steps of fully stirring a viscous solvent (propylene glycol and triethylene glycol monobutyl ether, 2g of each), 0.9g of surfactant (GS-A301E), 0.1g of wetting agent (WE3220), 82.2g of deionized water at normal temperature at 90-110rpm for 20min to fully mix the components uniformly, then adding 0.3g of sizing agent (JH-611), 7g of fixing water-resistant agent (DK6810), 5.5g of adhesive (modified starch), fully stirring at normal temperature at 90-190rpm for 30min, and finally filtering by using a secondary precise filtering system with the pore diameters of 0.45 mu m and 0.22 mu m respectively to obtain the preprinting liquid.

Comparative example 1

A preprinting liquid is prepared by the following preparation method:

sequentially adding: viscous solvent (diethylene glycol + diethylene glycol monobutyl ether, 3g each), 1g surfactant (GS-4100), 0.1g humectant (hydropalat 140), 92.6g deionized water, stirring thoroughly at normal temperature 90-110rpm for 20min, adding 0.3g sizing agent (JH-611), stirring thoroughly at normal temperature 90-190rpm for 30min, and filtering with secondary precise filtration system with pore diameters of 0.45 μm and 0.22 μm respectively to obtain preprinting liquid.

Comparative example 2

A preprinting liquid is prepared by the following preparation method:

sequentially adding: 0.8g of wetting agent (T86), 0.05g of surfactant (surfynol 960surfactant), 86.75g of deionized water, and stirring at normal temperature of 90-110rpm for 20min to mix them uniformly, then adding 0.4g of sizing agent (JH-611), 8g of fixing water-resistant agent (DK6885), 4g of adhesive (PVA 17-92), stirring at normal temperature of 90-190rpm for 30min, and filtering with a secondary microfiltration system with pore diameters of 0.45 μm and 0.22 μm respectively to obtain the preprinting liquid.

Comparative example 3

A preprinting liquid is prepared by the following preparation method:

sequentially adding: the pre-printing solution is prepared by fully stirring a viscous solvent (2 g of propylene glycol and triethylene glycol monobutyl ether respectively) and 83.2g of deionized water at normal temperature of 90-110rpm for 20min, fully mixing the viscous solvent and the deionized water uniformly, then adding 0.3g of a sizing agent (JH-611), 7g of a fixing water-resistant agent (DK6810) and 5.5g of an adhesive (modified starch) in sequence, fully stirring at normal temperature of 90-190rpm for 30min, and filtering by using a secondary precise filtering system with the pore diameters of 0.45 mu m and 0.22 mu m respectively to obtain the pre-printing solution.

Comparative example 4

A preprinting liquid is prepared by the following preparation method:

sequentially adding: a viscous solvent (propylene glycol + diethylene glycol monobutyl ether, 3g each), 1g of surfactant (GS-4100), 0.1g of wetting agent (hydropalat 140), 89.6g of deionized water, and the mixture is fully stirred at normal temperature of 90-110rpm for 20min to be fully mixed uniformly, then 0.3g of sizing agent (JH-611), 1.5g of fixing water-resistant agent (DK6885), 1.5g of adhesive (PVA-0588), and the mixture is fully stirred at normal temperature of 90-190rpm for 30min, and filtered by a secondary precise filtering system with the pore diameters of 0.45 mu m and 0.22 mu m respectively to obtain the preprinting liquid.

Comparative example 5

A preprinting liquid is prepared by the following preparation method:

sequentially adding: the preprinting solution is prepared by fully stirring a viscous solvent (propylene glycol and diethylene glycol monobutyl ether, 2g of each), 0.8g of a wetting agent (T86), 0.05g of a surfactant (surfynol 960surfactant), 57.75g of deionized water at normal temperature and 90-110rpm for 20min, fully mixing the components uniformly, then adding 0.4g of a sizing agent (JH-611), 16g of a fixing water-resistant agent (DK6885), 21g of an adhesive (PVA 17-92), fully stirring the components at normal temperature and 90-190rpm for 30min, and filtering the mixture by using a secondary precise filtering system with the pore diameters of 0.45 mu m and 0.22 mu m respectively to obtain the preprinting solution.

Performance testing

Spraying the preprinting liquid prepared in the above examples and comparative examples on corrugated paper boards, and detecting the wetting condition and the coverage condition after drying of the boards; after drying, the dye ink is digitally printed, and various comparisons are made between the printing condition of the corrugated cardboard after printing the dye ink and the printing condition of the corrugated cardboard without the preprinting liquid and the corrugated cardboard with the proportional preprinting liquid, and the results are shown in table 1 below.

TABLE 1

In addition, fig. 1 is a comparison graph of the wetting effects of the preprinting liquid of the example 2 and the comparative example 2, and it can be seen from the graph that the wetting effect of the preprinting liquid of the example 1 (left side of fig. 1) is better than that of the preprinting liquid of the comparative example 1 (right side of fig. 1); FIG. 2 is a graph comparing the wetting effects of example 3 and comparative example 3, and it can be seen that the wetting effect of the pre-printed liquid of example 3 (left side of FIG. 2) is better than that of the pre-printed liquid of comparative example 3 (right side of FIG. 2); in fig. 1 and 2, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% from top to bottom represent different proportion ink output settings of the ejection head in dye ink printing, so that the wetting and covering effects in the case of different ink output amounts can be observed, and the wetting condition can be better observed and verified.

FIG. 3 is a clear comparison between the jet printing of the example 1 and the comparative example 1, and it can be seen that the jet printing definition (right side of FIG. 3) of the dye ink after using the preprinting liquid of the example 1 is better than the definition (left side of FIG. 3) of the preprinting liquid of the comparative example 1.

On same corrugated paper cardboard, adopt the preprinting liquid of this application and not scribble the preprinting liquid and compare: FIG. 4 is a comparison graph of the water-proof effect between the paper board of the embodiment 1 and the paper board without pre-printing liquid, wherein the water-proof property of the color block of the paper board without pre-printing liquid is poor after the color block is sprayed with water (on the left side of FIG. 4), while the water-proof property of the color block of the paper board without pre-printing liquid is good after the color block is sprayed with water (on the right side of FIG. 4) by using the pre-printing liquid of the embodiment 1. FIG. 5 is a graph comparing the color density effect of example 2 of the present application and an uncoated preprinting liquid; the paperboard dye ink without the preprinting liquid has poor color density after being sprayed (the left side of figure 5), while the preprinting liquid of the embodiment 2 of the application has good color density after being sprayed with the dye ink (the right side of figure 5). Fig. 6 is a comparison graph of the coloring effect of the paper board without the preprinting liquid and the coloring effect of the paper board without the preprinting liquid, wherein the coloring effect is poor after the paper board is sprayed with the dye ink (on the right side of fig. 6), and the color density of the paper board is good after the paper board is sprayed with the preprinting liquid of the paper board of the embodiment 3 (on the left side of fig. 6).

From the results of the above examples and comparative tests it can be seen that: the wetting condition of the preprinting liquid, the waterproof performance of the paper board after spray printing and the definition and color condition of the paper board after spray printing in the embodiments 1-3 achieve good effects; comparative example 1, since fixing water-resistant agent and adhesive were not added, the water-repellent property and color clarity were poor; compared with the comparative example 2, because the alcohol ether combined solvent is not added, the wetting effect of the preprinting liquid is slightly poor, and particularly, when a spray head is used for spraying, the conditions of line breakage, even loss and the like of spraying are easily caused; comparative example 3, wetting was also poor because no other adjuvants were added; comparative example 4, since the amount of the fixing water resistant agent and the adhesive agent added was too small, the corresponding effect was not obtained; comparative example 5, although the water-repellent property and the effect of the definition and color after the spray printing of the paper sheet were good, the viscosity exceeded 15 mPas (30 ℃ C.) due to the addition of too much fixing water-resistant agent and adhesive agent, and was too high to be smeared or sprayed, the wetting effect was poor, and drying was not easy to occur, which affects the subsequent spray printing.

In conclusion, the comprehensive effect of the preprinting liquid of the embodiment of the application is optimal.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.