阅读说明：本技术 一种用于单色印刷的饰面原纸的生产方法 (Production method of decorative base paper for monochromatic printing ) 是由 王敏良 骆志荣 王瑾 罗申 郑国荣 戴华芬 于 2020-12-21 设计创作，主要内容包括：本发明提供一种用于单色印刷的饰面原纸的生产方法,包括准备工作、纤维原料及填料预制作、原纸材料复合处理、原纸制备等步骤。本发明原料环保、工艺简单、产品优质,能满足单色印刷用饰面原纸的生产要求。(The invention provides a production method of decorative base paper for monochromatic printing, which comprises the steps of preparation, fiber raw material and filler pre-manufacturing, base paper material composite treatment, base paper preparation and the like. The raw materials of the invention are environment-friendly, the process is simple, the product is high-quality, and the production requirement of the decorative base paper for monochromatic printing can be met.)

1. A production method of facing base paper for monochrome printing is characterized in that: the method comprises the following steps:

1) preparation work

Preparing raw materials: preparing 40-50 parts of hardwood chemical pulp paper and 10-20 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 25-35 parts of titanium dioxide, 5-15 parts of kaolin, 5-10 parts of pigment, 5-8% of sodium hydroxide aqueous solution with enough solute by mass, 2-5% of aluminum sulfate with enough solute by mass and 10-13% of defoaming agent with enough solute by mass according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step 1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step 1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and obtaining fiber pulp through friction, kneading and fibrillation;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a pulp flowing box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, and a wet paper web is obtained after the net is formed;

thirdly, carrying out vacuum squeezing, pre-drying and drying treatment and post-drying and drying treatment on the wet paper web obtained in the step 4) to obtain a dry paper sheet;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to press polishing by a soft calender to obtain the decorative base paper for single-color printing.

2. The process for producing a facing base paper for monochromatic printing according to claim 1, characterized in that: the defoaming agent is an organic silicon defoaming agent.

3. The process for producing a facing base paper for monochromatic printing according to claim 1, characterized in that: in the step II of the stage 2), the viscosity of the titanium dioxide kaolin dissolved solution is 12-16s, and the pH value is 7-7.8.

4. The process for producing a facing base paper for monochromatic printing according to claim 1, characterized in that: in the step II of the stage 3), the beating degree of the fiber pulp is 38-48 degrees SR, and the wet weight is 1.0-2.0.

5. The process for producing a facing base paper for monochromatic printing according to claim 1, characterized in that: in the second step of the stage 4), the water content of the wet paper web is 40-50%, and the pulp speed/wire speed ratio in the wire part forming process is 1.0-1.1.

6. The process for producing a facing base paper for monochromatic printing according to claim 1, characterized in that: in the step 4), the water content of the dry paper sheet is 1.0-2.0%.

7. The process for producing a facing base paper for monochromatic printing according to claim 1, characterized in that: in the stage 4), the water content of the facing base paper for monochromatic printing is 1.5-3.0%.

Technical Field

The invention relates to a preparation method of facing base paper, in particular to a production method of the facing base paper for monochromatic printing.

Background

The facing base paper is an industrial special paper which is made by using high-quality biomass fiber material, titanium dioxide and kaolin as main raw materials and processing the raw materials through a special production process, and is mainly used for a facing layer of an artificial board after printing and gum dipping, and further used for manufacturing furniture, floors, wallboards and the like. The existing facing base paper for monochromatic printing has the following defects:

1. the poor porosity and air permeability cause the problems of poor penetration and the like easily in the downstream gum dipping and pressing process, further cause the problems of poor glue solidification, plate floating, plate cracking and the like in the pressing process.

2. The existing facing base paper can be used for less products for printing, and is easy to have a series of problems of printing blossoming, poor uniformity and the like when being used for monochromatic printing, thereby causing the observability of downstream products to be poor.

3. The existing decorative base paper can better meet the decoration requirement only by improving the covering performance of the decorative base paper, more titanium dioxide needs to be added to improve the covering performance, but the increase of the using amount of the titanium dioxide can cause low porosity of paper sheets, is extremely compact, poor in paper sheet absorption, poor in inking during printing, poor in fullness of printed products, and a large amount of ink needs to be printed in the process of monochromatic printing, so that the paper sheet with poor absorption performance can hardly meet the requirement of monochromatic printing.

Disclosure of Invention

The invention aims to provide a method for producing high-quality decorative base paper for monochromatic printing, which has the advantages of environment-friendly raw materials, simple process and high product quality.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a method for producing a facing base paper for monochrome printing, comprising the steps of:

1) preparation work

Preparing raw materials: preparing 40-50 parts of hardwood chemical pulp paper and 10-20 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 25-35 parts of titanium dioxide, 5-15 parts of kaolin, 5-10 parts of pigment, 5-8% of sodium hydroxide aqueous solution with enough solute by mass, 2-5% of aluminum sulfate with enough solute by mass and 10-13% of defoaming agent with enough solute by mass according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step 1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step 1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and obtaining fiber pulp through friction, kneading and fibrillation;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a pulp flowing box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, and a wet paper web is obtained after the net is formed;

thirdly, carrying out vacuum squeezing, pre-drying and drying treatment and post-drying and drying treatment on the wet paper web obtained in the step 4) to obtain a dry paper sheet;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to press polishing by a soft calender to obtain the decorative base paper for single-color printing.

Further, the defoaming agent is an organic silicon defoaming agent.

Furthermore, in the step II of the stage 2), the viscosity of the titanium dioxide kaolin solution is 12-16s, and the pH value is 7-7.8.

Furthermore, in the step II of the stage 3) of the invention, the beating degree of the fiber pulp is 38-48 degrees SR, and the wet weight is 1.0-2.0.

Furthermore, in the step 4), the water content of the wet paper web is 40-50%, and the pulp speed/wire speed ratio in the wire part forming process is 1.0-1.1.

Furthermore, in the third step of the stage 4), the water content of the dry paper sheet is 1.0-2.0%.

Furthermore, in the step 4), the moisture content of the base paper for single-color printing is 1.5-3.0%.

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

(1) most raw materials and auxiliary materials used in the invention are plant materials or inorganic mineral materials, and the aluminum sulfate and the defoaming agent are nontoxic and harmless, so the raw materials adopted in the invention are environment-friendly, nontoxic and harmless raw materials, and the production method does not comprise toxic and harmful operations such as combustion and the like, so the production method and the product are nontoxic and environment-friendly, and meet the requirements of the state on high-quality development and environment protection.

(2) According to the invention, the titanium dioxide and kaolin are dissolved and dispersed by using the sodium hydroxide aqueous solution to obtain a polydisperse dissolution system with good dispersibility, so that the finally prepared facing base paper has good uniformity and smooth surface.

(3) The invention has simple operation, energy saving and environmental protection, and the obtained product has excellent quality and can completely meet the requirement of monochromatic printing.

(4) According to the invention, by adjusting the fiber proportion, the beating degree, the filler addition ratio and the like, the obtained product has good air permeability and absorptivity through detection, the surface is uniform and fine after printing, and the observability is greatly improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:

FIG. 1 is a graph showing the effect of an actual printing test in the printer according to example 1 of the present invention;

FIG. 2 is a microscopic morphology photograph of example 1 of the present invention;

FIG. 3 is a graph showing the effect of the actual printing test of the printer according to embodiment 2 of the present invention;

FIG. 4 is a microscopic morphology photograph of example 2 of the present invention;

FIG. 5 is a graph showing the effect of the actual printing test of the printer according to embodiment 3 of the present invention;

FIG. 6 is a microscopic morphology photograph of example 3 of the present invention;

FIG. 7 is a graph showing the effect of the actual printing test of the printer according to embodiment 4 of the present invention;

FIG. 8 is a microscopic morphology photograph of example 4 of the present invention;

FIG. 9 is a graph showing the effect of the actual printing test of the printer according to embodiment 5 of the present invention;

FIG. 10 is a microscopic morphology photograph of example 5 of the present invention;

FIG. 11 is a graph showing the effect of the actual printing test by the printer according to embodiment 6 of the present invention;

FIG. 12 is a microscopic morphology photograph of example 6 of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.

Example 1

The facing base paper for monochrome printing was produced according to the following steps:

1) preparation work

Preparing raw materials: preparing 41 parts of hardwood chemical pulp paper and 18 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 28 parts of titanium dioxide, 13 parts of kaolin, 8 parts of pigment, a sufficient sodium hydroxide aqueous solution with solute mass fraction of 7%, sufficient aluminum sulfate with solute mass fraction of 4% and a sufficient organic silicon defoaming agent with solute mass fraction of 12% according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step (1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution with the viscosity of 12-16s and the pH value of 7-7.8;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and rubbing, crushing and fibrillating to obtain fiber pulp with the beating degree of 38-48 DEG SR and the wet weight of 1.0-2.0;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a head box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, a wet paper web with the water content of 40-50% is obtained after the net part is formed, and the pulp speed/net speed ratio is 1.0-1.1 in the forming process of the net part;

thirdly, carrying out vacuum squeezing, pre-drying and post-drying treatment on the wet paper web obtained in the step 4) to obtain dry paper pages with the water content of 1.0-2.0%;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to calendaring treatment by a soft calendaring machine to obtain the decorative base paper for single-color printing with the water content of 1.5-3.0%.

Example 2

The facing base paper for monochrome printing was produced according to the following steps:

1) preparation work

Preparing raw materials: preparing 40 parts of hardwood chemical pulp paper and 14 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 25 parts of titanium dioxide, 15 parts of kaolin, 7 parts of pigment, a sufficient sodium hydroxide aqueous solution with solute mass fraction of 5%, sufficient aluminum sulfate with solute mass fraction of 5% and a sufficient organic silicon defoaming agent with solute mass fraction of 11% according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step (1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution with the viscosity of 12-16s and the pH value of 7-7.8;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and rubbing, crushing and fibrillating to obtain fiber pulp with the beating degree of 38-48 DEG SR and the wet weight of 1.0-2.0;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a head box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, a wet paper web with the water content of 40-50% is obtained after the net part is formed, and the pulp speed/net speed ratio is 1.0-1.1 in the forming process of the net part;

thirdly, carrying out vacuum squeezing, pre-drying and post-drying treatment on the wet paper web obtained in the step 4) to obtain dry paper pages with the water content of 1.0-2.0%;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to calendaring treatment by a soft calendaring machine to obtain the decorative base paper for single-color printing with the water content of 1.5-3.0%.

Example 3

The facing base paper for monochrome printing was produced according to the following steps:

1) preparation work

Preparing raw materials: preparing 43 parts of hardwood chemical pulp paper and 15 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 28 parts of titanium dioxide, 14 parts of kaolin, 5 parts of pigment, a sufficient sodium hydroxide aqueous solution with solute mass fraction of 6%, sufficient aluminum sulfate with solute mass fraction of 2% and a sufficient organic silicon defoaming agent with solute mass fraction of 12% according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step (1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution with the viscosity of 12-16s and the pH value of 7-7.8;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and rubbing, crushing and fibrillating to obtain fiber pulp with the beating degree of 38-48 DEG SR and the wet weight of 1.0-2.0;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a head box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, a wet paper web with the water content of 40-50% is obtained after the net part is formed, and the pulp speed/net speed ratio is 1.0-1.1 in the forming process of the net part;

thirdly, carrying out vacuum squeezing, pre-drying and post-drying treatment on the wet paper web obtained in the step 4) to obtain dry paper pages with the water content of 1.0-2.0%;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to calendaring treatment by a soft calendaring machine to obtain the decorative base paper for single-color printing with the water content of 1.5-3.0%.

Example 4

The facing base paper for monochrome printing was produced according to the following steps:

1) preparation work

Preparing raw materials: preparing 40 parts of hardwood chemical pulp paper and 16 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 26 parts of titanium dioxide, 14 parts of kaolin, 6 parts of pigment, a sufficient sodium hydroxide aqueous solution with solute mass fraction of 8%, sufficient aluminum sulfate with solute mass fraction of 3% and a sufficient organic silicon defoaming agent with solute mass fraction of 10% according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step (1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution with the viscosity of 12-16s and the pH value of 7-7.8;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and rubbing, crushing and fibrillating to obtain fiber pulp with the beating degree of 38-48 DEG SR and the wet weight of 1.0-2.0;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a head box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, a wet paper web with the water content of 40-50% is obtained after the net part is formed, and the pulp speed/net speed ratio is 1.0-1.1 in the forming process of the net part;

thirdly, carrying out vacuum squeezing, pre-drying and post-drying treatment on the wet paper web obtained in the step 4) to obtain dry paper pages with the water content of 1.0-2.0%;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to calendaring treatment by a soft calendaring machine to obtain the decorative base paper for single-color printing with the water content of 1.5-3.0%.

Example 5

The facing base paper for monochrome printing was produced according to the following steps:

1) preparation work

Preparing raw materials: preparing 43 parts of hardwood chemical pulp paper and 13 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 27 parts of titanium dioxide, 15 parts of kaolin, 10 parts of pigment, a sufficient sodium hydroxide aqueous solution with solute mass fraction of 5%, sufficient aluminum sulfate with solute mass fraction of 4% and a sufficient organic silicon defoaming agent with solute mass fraction of 11% according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step (1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution with the viscosity of 12-16s and the pH value of 7-7.8;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and rubbing, crushing and fibrillating to obtain fiber pulp with the beating degree of 38-48 DEG SR and the wet weight of 1.0-2.0;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a head box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, a wet paper web with the water content of 40-50% is obtained after the net part is formed, and the pulp speed/net speed ratio is 1.0-1.1 in the forming process of the net part;

thirdly, carrying out vacuum squeezing, pre-drying and post-drying treatment on the wet paper web obtained in the step 4) to obtain dry paper pages with the water content of 1.0-2.0%;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to calendaring treatment by a soft calendaring machine to obtain the decorative base paper for single-color printing with the water content of 1.5-3.0%.

Example 6

The facing base paper for monochrome printing was produced according to the following steps:

1) preparation work

Preparing raw materials: preparing 50 parts of hardwood chemical pulp paper and 10 parts of softwood chemical pulp paper according to parts by weight;

preparing a filling material: preparing 35 parts of titanium dioxide, 5 parts of kaolin, 9 parts of pigment, a sufficient sodium hydroxide aqueous solution with solute mass fraction of 7%, sufficient aluminum sulfate with solute mass fraction of 3% and a sufficient organic silicon defoaming agent with solute mass fraction of 13% according to parts by weight;

2) fiber raw material and filler pre-production

Firstly, conveying the broadleaf wood chemical pulp paper and the softwood chemical pulp paper prepared in the step 1) to a beating pool, adding water to obtain pulp with the mass concentration of 6.5%, and adding 2 parts of pigment prepared in the step 1) and uniformly mixing to obtain pigment mixed pulp;

adding the titanium dioxide and kaolin prepared in the step (1) into a dissolving tank, adding water at normal temperature, stirring and dissolving to obtain a solution with the viscosity of 10-15s and the mass concentration of 65%, dropwise adding the sodium hydroxide aqueous solution prepared in the step (1) into the solution, and uniformly stirring to obtain a titanium dioxide kaolin solution with the viscosity of 12-16s and the pH value of 7-7.8;

3) compounding treatment of base paper material

Firstly, conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide kaolin dissolved solution obtained in the step II in the stage 2) to a slurry pool, and stirring until the mixture is uniformly mixed to obtain mixed slurry;

diluting the mixed pulp obtained in the step (3) by using raw water in a regulating reservoir until the mass concentration is 3.0%, conveying the mixed pulp to disc mill equipment for pulping, and rubbing, crushing and fibrillating to obtain fiber pulp with the beating degree of 38-48 DEG SR and the wet weight of 1.0-2.0;

4) base paper preparation

Firstly, conveying the fiber slurry obtained in the step 3) and the defoaming agent and the aluminum sulfate prepared in the step 1) to a regulating tank and a slurry stabilizing tank, and stirring until the materials are uniformly mixed to obtain slurry;

secondly, the pulp obtained in the first step in the step 4) is conveyed to a head box, is homogenized by a homogenizing roller and then is sprayed to a forming net through a lip, a wet paper web with the water content of 40-50% is obtained after the net part is formed, and the pulp speed/net speed ratio is 1.0-1.1 in the forming process of the net part;

thirdly, carrying out vacuum squeezing, pre-drying and post-drying treatment on the wet paper web obtained in the step 4) to obtain dry paper pages with the water content of 1.0-2.0%;

fourthly, the dry paper obtained in the third step of the step 4) is subjected to spraying wet treatment by a spraying wet box, and then is subjected to calendaring treatment by a soft calendaring machine to obtain the decorative base paper for single-color printing with the water content of 1.5-3.0%.

Comparative example: the difference from example 1 is that: sufficient sodium hydroxide aqueous solution with solute mass fraction of 7 percent is not included in the filler, and the step II of the stage 2) is omitted; and 3) changing the step (I) into the following steps: and (3) conveying the pigment mixed slurry obtained in the step I in the stage 2) and the titanium dioxide and kaolin prepared in the step II in the stage 1) to a slurry pool, and stirring until the titanium dioxide and the kaolin are uniformly mixed to obtain mixed slurry. That is, the comparative example did not include the operation of dissolving titanium dioxide and kaolin using an aqueous solution of sodium hydroxide.

The first experimental example:

the performance of the facing base papers for monochrome printing obtained in examples 1 to 6 and comparative example was tested with reference to GB/T28995 and 2012, respectively, and the test results are shown in the following table:

as can be seen from the above table, the finishing base papers for monochrome printing prepared in examples 1 to 6 of the present invention have good properties. Compared with the example 1, the smoothness and air permeability of the comparative example are obviously reduced, which shows that the operation of dissolving the titanium dioxide and the kaolin by using the sodium hydroxide aqueous solution can effectively improve the surface smoothness and the air permeability of the facing base paper.

Experiment example two:

the effect of the actual printing test of the single-color printing facing base paper obtained in the embodiments 1 to 6 by using a printing machine is shown in the attached drawings 1, 3, 5, 7, 9 and 11, and it can be seen that the printed facing base paper for single-color printing prepared in the embodiments 1 to 6 of the present invention has a uniform and fine surface and good observability.

Experiment example three:

the base paper for single color printing obtained in examples 1 to 6 was subjected to microscopic morphology tests, as shown in fig. 2, 4, 6, 8, 10, and 12, respectively, and it can be seen that the base paper for single color printing obtained in examples 1 to 6 of the present invention has high porosity and good air permeability.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.