CN109972446B

CN109972446B - White paperboard suitable for high-speed printing and preparation method thereof

Info

Publication number: CN109972446B
Application number: CN201910175066.7A
Authority: CN
Inventors: 陈港; 张俊奇; 蔡庆辉
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2021-09-21
Anticipated expiration: 2039-03-08
Also published as: CN109972446A

Abstract

The invention belongs to the technical fields of papermaking and printing and packaging, and provides a whiteboard paper suitable for high-speed printing and a preparation method thereof. The preparation method includes the following steps: coating a coating on the surface of a base paper layer to form a coating layer, drying and calendering to obtain the whiteboard paper suitable for high-speed printing. In the preparation method provided by the invention, by constructing a porous functional coating as the surface coating of the whiteboard paper, the prepared whiteboard paper can meet the requirements of the high-speed printing mode of the industrial digital printer, and the printed matter with full color and high definition can be obtained after printing; The invention innovatively uses calcium carbonate as the coating pigment, and innovatively puts forward relevant requirements for the shape and particle size distribution of calcium carbonate, so that the prepared whiteboard paper can not only meet the requirements of the low-speed printing mode of ordinary printers, but also the optimized coating Layer structure, there will be no problems such as color is not bright or color cast, so it can be used in high-speed printing mode.

Description

White paperboard suitable for high-speed printing and preparation method thereof

Technical Field

The invention belongs to the technical field of papermaking, printing and packaging, and particularly relates to white board paper suitable for high-speed printing and a preparation method thereof.

Background

The white board paper is used as the main paper type of paper for the carton, is widely applied to packaging of food, medicine, household appliances, daily general goods, knitted cotton fabrics, cultural goods and the like, has a use range covering various fields of national production and life, and is an important component of packaging materials in China. The surface of the white board paper on the market at present has no coating layer, and the white board paper is directly used for digital printing, ink can not form a good ink layer and a good color development effect on the surface of the white board paper, and printed patterns are dark in color and can not meet market requirements.

In addition, with the continuous progress of digital printing technology, the emergence of new industrial digital printers also puts new demands on white board paper. The Chinese herbal medicine group successfully develops an industrial digital printer for digital printing of corrugated boards, uses the Single Pass technology equipped with a Jing porcelain nozzle for the first time, the digital printing of the paper box is transited to the industrial-grade rapid production from the traditional scanning type printing, the printing speed can reach as high as 150m/min, the jet printing precision is 600x 1800dpi, the high-speed printing mode provides new requirements and challenges for ink-jet printing paper, and when the industrial digital printer prints at high speed, the ink head is fixed, the paper passes through the lower end of the ink head at high speed, the ink head ejects ink to the surface of the paper in a piezoelectric mode, at the moment, the ink and the paper have larger speed difference, and the deformation of ink drops is caused by the speed difference when the ink contacts the paper, meanwhile, the ink-jet printing ink also has influence on the permeation and diffusion of ink and paper, and the traditional ink-jet coating formula cannot adapt to the high-speed printing mode.

Therefore, a white paperboard suitable for high-speed printing and a preparation method thereof are developed to solve the technical defect that the inkjet coating cannot be suitable for high-speed printing in the prior art, and the problem to be solved in the field is urgently solved.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a white paperboard suitable for high-speed printing and a preparation method thereof.

The invention aims to solve the technical defects in the prior art and prepare the white paperboard suitable for high-speed printing. The invention designs and constructs a porous coating, and the balance of permeation and diffusion of ink and the coating can still be achieved under the condition of large speed difference between the ink and paper by optimizing the structure of the coating and applying pigments with different scales. The porous coating is composed of spherical calcium carbonate particles with different particle sizes, and is matched with the effects of an adhesive and a cationic color fixing agent to form a functional coating of the white board, so that the white board is suitable for a high-speed printing mode (50-150m/min) of an industrial digital printer.

The purpose of the invention is realized by the following technical scheme.

The white paperboard suitable for high-speed printing (50-150m/min) provided by the invention comprises a raw paper layer (with the quantitative of 100-²) And a coating layer; the coating layer comprises the following raw materials in parts by weight:

80-120 parts of calcium carbonate;

5-10 parts of an adhesive;

2-5 parts of a cationic color fixing agent;

0.025 to 0.1 portion of defoaming agent.

Further, the basis weight of the raw paper layer is 100-420g/m²。

Further, the calcium carbonate is spherical particles, and the particle grading of the calcium carbonate is that the particle size is 0-0.4um accounts for 5-8%, the particle size is 0.4-1um accounts for 75-85%, and the particle size is 1um-2um accounts for 10-25% by mass percentage.

Further, the adhesive is more than one of polyvinyl alcohol, modified starch and carboxymethyl cellulose; the cationic color fixing agent is more than one of quaternary ammonium salt (including polyacrylic acid dimethylamine ethyl ester quaternary ammonium chloride salt and polydimethyl diallyl ammonium chloride), cationic polyamine (including polyvinyl amine and polyethyleneimine) or waterborne polyurethane.

Further, the quaternary ammonium salt comprises polyacrylic acid dimethylamine ethyl ester quaternary ammonium chloride salt and polydimethyl diallyl ammonium chloride; the cationic polyamines include polyvinylamines and polyethyleneimines.

Further, the defoaming agent is more than one of a mineral oil defoaming agent, an organic silicon defoaming agent or a polyether defoaming agent.

The invention provides a method for preparing the white paperboard suitable for high-speed printing, which comprises the following steps:

(1) weighing raw materials of the coating layer, and uniformly mixing to form a coating;

(2) in the raw paper layer (basis weight of 100-²) Coating the coating material in the step (1) on the surface (front surface) to form a coating layer;

(3) and drying and calendering to obtain the white board paper suitable for high-speed printing.

Further, the solid content of the coating in the step (1) is 40-60%.

Further, the coating modes in the step (2) comprise blade coating, rod coating and curtain coating; the coating weight of the coating in the step (2) is 4-12g/m²。

Further, the drying temperature in the step (3) is 70-160 ℃; the calendering temperature is 60-230 ℃, and the calendering pressure is 10-60 kN/m.

The technical scheme of the invention is different from the existing technical scheme of using silicon dioxide, the technical scheme of using silicon dioxide mainly utilizes the small particle size, high specific surface area and high oil absorption value of silicon dioxide to obtain an ink absorption coating, the permeation absorption effect on ink is strong, the diffusion effect is weak, and the coating is suitable for a low-speed printing mode; in addition, in some technical schemes, in order to reduce the coating cost, calcium carbonate is selected to replace part of silicon dioxide or all calcium carbonate is used as the pigment of the coating, but no clear requirements are provided for the shape and the particle size distribution of the calcium carbonate, the ink absorption coating obtained by using the conventional calcium carbonate product can only meet the low-speed printing mode of a common printer, and under the high-speed printing mode of an industrial digital printer, the problems of non-bright color or color cast and the like can occur due to the non-optimized coating structure.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) the invention provides a preparation method of white board paper suitable for high-speed printing, which is characterized in that a porous functional coating is constructed to serve as a surface layer of the white board paper, so that the prepared white board paper meets the requirements of a high-speed printing mode of an industrial digital printer, has good ink absorption and color development capability, and can obtain printed matters with full colors and high definition after printing.

(2) The preparation method provided by the invention selects calcium carbonate as the coating pigment, and innovatively puts forward relevant requirements on the shape and particle size distribution of the calcium carbonate, so that the prepared white board can meet the requirements of a low-speed printing mode of a common answering machine and can also be used in a high-speed printing mode of an industrial digital printer; the optimized coating structure can not have the problems of non-bright color or color cast and the like.

(3) The preparation method provided by the invention is different from the existing technical scheme of using silicon dioxide, and calcium carbonate is selected as a coating pigment, so that the production cost is reduced, and the preparation method has certain significance for industrial production.

Drawings

FIG. 1 is a schematic view showing the dot distribution at solid densities in comparative example 1 and examples 1 to 3;

FIG. 2 is a schematic diagram showing the dot distribution state in the solid density of comparative example 2 and comparative example 3;

fig. 3 is a schematic view of the dot distribution state in the solid density of comparative example 4.

Detailed Description

It is noted that the following processes or parameters, if not specified in particular detail, are understood or implemented by those skilled in the art with reference to the prior art.

The invention provides a white paperboard suitable for high-speed printing and a preparation method thereof, which are used for solving the technical defect that an ink-jet coating in the prior art cannot be suitable for high-speed printing.

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. To illustrate the advantages of the present invention in more detail, reference is now made to the following examples, which are provided for illustration of the prior art disclosure, in comparison with the present invention.

The weight (mass) parts used in the following examples and comparative examples may be, for example, 1kg for one part, or any other amount commonly used in the art.

Comparative example 1

The patent name: an ink jet printing paper (patent No. 200510048121.4), embodiment 1 of the patent.

The patent is characterized in that one side of a paper base is coated with a layer of water-based ink-jet paint, and the paint comprises the following components in parts by weight:

dissolving 5 parts by weight of PVA125 into 45 parts by weight of water to obtain a 10% PVA aqueous solution; 100 parts of 25% (W) JetCoat was mixed with the above PVA aqueous solution, and then 1 part of Retaminol KT, 1 part of ammonium zirconium carbonate and the remaining 442 parts of water were added thereto and stirred uniformly to obtain an aqueous inkjet coating having a solid content of 18% and a viscosity of 0.01 PaS.

The water-based ink-jet coating obtained in the above way is used as a coating of white board paper, and is dried and calendered after being coated to obtain ink-jet printing paper, wherein the coating weight is 6g/m²The base paper, drying and calendering parameters were the same as in comparative example 4 of the invention.

Comparative example 2

The patent name: a novel color ink jet paper coating formulation (patent No. 201510398838.5), example 1 version of this patent.

The composition comprises the following components in parts by mass: 20 parts of nano silicon dioxide, 75 parts of deionized water, 8 parts of modified bentonite, 3 parts of acrylic emulsion, 3.6 parts of modified alumina, 13 parts of carboxymethyl cellulose, 5.2 parts of polyvinyl alcohol, 1.8 parts of boric acid and 5 parts of poly dimethyl propyl ammonium chloride.

Preparing the components into a coating, taking the obtained coating as the coating of white board paper, drying after coating, and calendaring to obtain the ink-jet printing paper, wherein the coating weight is 6g/m²The base paper, drying and calendering parameters were the same as in comparative example 4 of the invention.

Comparative example 3

The patent name: a matt color ink jet printing paper coating and a preparation method thereof (patent number: 200810242828.2) embodiment 1 of the patent.

1. Adding 0.05 part of sodium polyacrylate into 85 parts of deionized water at room temperature for dissolution; 2.3 parts of modified bentonite is added into the dissolved deionized water, and the mixture is dispersed at room temperature; adopting a GFJ-04 type high-speed dispersion machine, dispersing the rotating speed: 3500 r/min; dispersing time: 45 min; the modified bentonite dispersion liquid comprises the following components in percentage by mass: 3 percent;

2. adding 9.0 parts of silicon dioxide into the modified bentonite dispersion liquid for dispersion to prepare a mixed dispersion liquid of the modified bentonite and the silicon dioxide; dispersing rotating speed: 3000 r/min; dispersing time: 30min, wherein the mass percentage concentration of the mixed dispersion liquid is 12%;

3. under the condition of stirring, adding 3.4 parts of polyvinyl alcohol (1788) into the mixed and dispersed mixed solution of the modified bentonite and the silicon dioxide, sequentially adding 0.006 part of silicone defoamer, 0.2 part of polydimethyldiallylammonium chloride and 0.1 part of carboxymethyl cellulose, and uniformly mixing and stirring to obtain a coating solution; stirring speed: 2500 r/min; stirring for 20 min.

The coating obtained above is used as the coating of white board paper, and is dried and calendered after being coated to obtain the ink-jet printing paper, wherein the coating weight is 6g/m²The base paper, drying and calendering parameters were the same as in comparative example 4 of the invention.

Comparative example 4

(1) 100 parts of calcium carbonate (the calcium carbonate is in a spindle shape and has an average particle size of 1.0um), 8 parts of polyvinyl alcohol, 3 parts of polyvinylamine, 0.075 part of a mineral oil defoamer and 111 parts of water are prepared into a coating, wherein the solid content of the coating is 50%.

(2) The prepared coating was applied at a basis weight of 150g/m²The surface (front surface) of the white board is coated by a doctor blade in a coating amount of 6g/m²The drying temperature is 120 ℃;

(3) and calendering the coated paper sample to obtain the ink-jet printing paper, wherein the calendering temperature is 150 ℃, and the pressure is 50 kN/m.

Example 1

(1) 90 parts of calcium carbonate (the calcium carbonate is spherical particles, the mass percentage of the calcium carbonate is 5-8% of particle size 0-0.4um, 75-85% of particle size 0.4-1um and 10-25% of particle size 1um-2 um), 4 parts of polyvinyl alcohol, 1 part of modified starch, 5 parts of polyacrylic acid dimethylamine ethyl ester chlorinated quaternary ammonium salt, 0.025 parts of polyether defoamer and 66.7 parts of water are prepared into a coating, and the solid content of the coating is 60%.

(2) The prepared coating was applied at a quantitative level of 420g/m²The surface (front) of the white board is coated in a curtain coating mode, and the coating weight is 12g/m²And the drying temperature is 160 ℃.

(3) And calendering the coated paper pattern to obtain the white board suitable for high-speed printing, wherein the calendering temperature is 230 ℃ and the pressure is 10 kN/m. .

Example 2

(1) 100 parts of calcium carbonate (the calcium carbonate is spherical particles, the mass percentage of the calcium carbonate is 5-8% of particle size 0-0.4um, 75-85% of particle size 0.4-1um and 10-25% of particle size 1um-2 um), 8 parts of polyvinyl alcohol, 3 parts of polyvinyl amine, 0.075 part of a mineral oil defoamer and 111 parts of water are prepared into a coating, and the solid content of the coating is 50%.

(3) and performing calendaring on the coated paper sample to obtain the white board suitable for high-speed printing, wherein the calendaring temperature is 150 ℃, and the calendaring pressure is 50 kN/m.

Example 3

(1) 110 parts of calcium carbonate (the calcium carbonate is spherical particles, the mass percentage of the calcium carbonate is 5-8% of particle size 0-0.4um, 75-85% of particle size 0.4-1um and 10-25% of particle size 1um-2 um), 9 parts of polyvinyl alcohol, 1 part of carboxymethyl cellulose, 2 parts of waterborne polyurethane, 0.1 part of organic silicon defoamer and 183.1 parts of water are prepared into a top coat coating, and the solid content of the coating is 40%.

(2) The prepared coating was applied at a basis weight of 100g/m²The surface (front surface) of the white board was coated by bar coating in a coating amount of 4g/m²The drying temperature is 70 ℃.

(3) And performing calendaring on the coated paper sample to obtain the white board suitable for high-speed printing, wherein the calendaring temperature is 60 ℃, and the calendaring pressure is 60 kN/m.

And (3) test evaluation:

the ink jet printing papers prepared in comparative examples 1 to 4 and examples 1 to 3 were printed using an industrial digital high speed printer (model: Handway gloss 1604, manufactured by Shenzhen Han Hua Industrial digital devices Co., Ltd.) at a printing speed of 100m/min and a resolution of 600dpi, 12PL mode, and the appearance, solid density and chroma of the samples after printing were evaluated (test apparatus: spectrodensitometer X-rite500, Esche, USA) as shown in the following tables (tables 1 and 2), Table 1 being a table of data of solid density of the samples and Table 2 being a table of chroma of the samples.

TABLE 1

	Comparative example 1	Comparative example 2	Comparative example 3	Comparative example 4	Example 1	Example 2	Example 3
								True density blue (C)	0.43	0.36	0.33	0.30	0.33	0.33	0.34
Solid density fuchsin (M)	0.8	0.74	0.66	0.66	0.74	0.76	0.73
								Solid density yellow (Y)	0.69	0.68	0.61	0.83	0.87	0.87	0.89
Solid density black (K)	1.15	1.27	1.09	1.22	1.24	1.29	1.29
								True density Red (R)	0.92	1.17	1.1	0.99	1.09	1.09	1.1
True density green (G)	0.81	0.85	0.79	0.72	0.74	0.76	0.78
								Solid density blue (B)	1.21	1.31	1.24	1.23	1.24	1.3	1.31

TABLE 2

When the printing effects of the ink jet printing papers prepared in examples 1 to 3 and comparative examples 1 to 4 are observed, the dot distribution states of the ink jet printing papers prepared in comparative examples 2 and 3 under the solid density are shown in fig. 2, and the deformation of ink dots is serious, and the phenomenon is caused because the silica system coatings are adopted in the comparative examples 2 and 3, and because the coatings have strong penetration absorption effect on ink, the penetration and diffusion effects of the ink and the paper coatings are unbalanced, the penetration effect is stronger than the diffusion effect, and the formed patterns have streak white exposure phenomenon under the influence of high-speed movement of the paper.

Comparative example 1 the dot distribution state at solid density is as shown in fig. 1, the dot state is normal, comparative example 1 uses flake precipitated calcium carbonate instead of silica, the specific surface area of calcium carbonate is low, the oil absorption value is low, the penetration of the formed coating to ink is weakened, the spreading and penetration of ink are balanced when the paper moves at high speed, the streak white phenomenon is weakened, but the coating structure formed by flake calcium carbonate has uneven pore distribution, the adsorption and fixation to different pigments are not balanced, the hue is darker, the hue is represented by cyan (C), magenta (M), the solid density is higher, the chroma L value is lower, the yellow (Y), black (K) solid density is lower, the chroma L value is higher, and the pattern color is not bright.

Comparative example 4 the distribution state of dots at solid density is shown in fig. 3, comparative example 4 uses spindle-shaped calcium carbonate, the rest of the raw materials are the same as those in example 2, and after coating and printing, the pattern has hue unsaturation phenomenon, which is because the spindle-shaped calcium carbonate constructs the ink-absorbing coating with uneven pores, and different areas of the coating have different ink absorption rates, resulting in partial dot unsaturation, and meanwhile, cyan (C) and magenta (M) have higher chroma L values, lower solid density, and light and unsaturated pattern color.

Examples 1-3 the distribution of dots at solid density is as shown in fig. 1, examples 1-3 constructed a porous coating structure with spherical calcium carbonate, which was influenced by high speed paper movement, balanced in ink diffusion and penetration, and balanced in adsorption and fixation of different colorants due to pore uniformity, thus obtaining fine patterns after printing in high speed printing mode of industrial digital printer.

The above examples are only preferred embodiments of the present invention, which are intended to be illustrative and not limiting, and those skilled in the art should understand that they can make various changes, substitutions and alterations without departing from the spirit and scope of the invention.

Claims

1. a kind of whiteboard paper suitable for high-speed printing, is characterized in that, comprises base paper layer and coating layer; The raw material of described coating layer, in parts by weight, comprises following material:

80-120 servings of calcium carbonate;

Adhesive 5-10 copies;

2-5 copies of cationic fixing agent;

0.025-0.1 part of defoamer;

The calcium carbonate is spherical particles, and in terms of mass percentage, the particle gradation of calcium carbonate is 0-0.4μm in particle size, accounting for 5-8%, particle size 0.4-1μm, accounting for 75-85%, particle size 1μm-2μm Account for 10-25%.

2 . The whiteboard paper suitable for high-speed printing according to claim 1 , wherein the basis weight of the base paper layer is 100-420 g/m ² .

3. a kind of whiteboard paper suitable for high-speed printing according to claim 1, is characterized in that, described sizing agent is more than one in polyvinyl alcohol, modified starch, carboxymethyl cellulose; The cationic fixative is one or more of quaternary polyammonium salt, cationic polyamine or water-based polyurethane.

4. a kind of whiteboard paper suitable for high-speed printing according to claim 3, is characterized in that, described quaternary polyammonium salt comprises polydimethylamine ethyl acrylate quaternary ammonium chloride, polydimethyldiallyl ammonium chloride; the cationic polyamine includes polyethylene amine and polyethylene imine.

5. a kind of whiteboard paper suitable for high-speed printing according to claim 1, is characterized in that, described defoamer is a kind of in mineral oil defoamer, silicone defoamer or polyether defoamer above.

6. a method for preparing the whiteboard paper suitable for high-speed printing described in any one of claims 1-5, is characterized in that, comprises the steps:

(1) Weigh the raw materials of the coating layer and mix them evenly to form a coating;

(2) Coating the coating described in step (1) on the front side of the base paper layer to form a coating layer;

(3) After drying and calendering, the whiteboard paper suitable for high-speed printing is obtained.

7 . The preparation method according to claim 6 , wherein the solid content of the coating in step (1) is 40-60%. 8 .

8 . The preparation method according to claim 6 , wherein the coating method in step (2) includes blade coating, bar coating and curtain coating; the coating in step (2) The coating weight is 4-12g/m ² .

9 . The preparation method according to claim 6 , wherein the drying temperature in step (3) is 70-160°C; the calendering temperature is 60-230°C, and the calendering pressure is 10-60kN/ m.