阅读说明：本技术 一种防近视纸张的生产工艺 (Production process of myopia-preventing paper ) 是由 李鹏 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种防近视纸张的生产工艺,具体制备步骤为：将木材和竹子通过破碎机破碎成小木片和小竹片,并控制小木片和小竹片内水分在40%-50%；将小木片和小竹片放入高压蒸煮锅中,同时在蒸锅中放入蒸煮液和氧化性助剂,在130℃-150℃情况下保压蒸煮4h-6h,制得粗浆料；将粗浆料通过分离器进行洗涤分离,分离粗浆料中的黑液,得到浆料；将浆料通过造纸机经一系列反应后制得纸张；本发明通过亚硫酸盐木浆制备纸张,其未漂浆因含少量木素和有色杂质,所以呈黄色,因而可省略漂白工序,直接制得淡黄色的纸张,减少了漂白工序所产生的污染性杂质,同时黄色纸张可以降低反射光的强度、增加反射光的色调,以改善视觉环境,避免引起视觉疲劳而造成近视眼,从而起到良好的防近视效果。(The invention discloses a production process of myopia-preventing paper, which comprises the following specific preparation steps: crushing wood and bamboo into small wood chips and small bamboo chips by a crusher, and controlling the moisture in the small wood chips and the small bamboo chips to be 40-50%; putting the small wood chips and the small bamboo chips into a high-pressure digester, simultaneously putting a cooking liquor and an oxidizing auxiliary agent into the digester, and performing pressure-maintaining cooking for 4-6 h at the temperature of 130-150 ℃ to prepare a crude slurry; washing and separating the crude slurry through a separator, and separating black liquor in the crude slurry to obtain slurry; making the pulp pass through a paper machine to prepare paper after a series of reactions; the paper is prepared from the sulfite wood pulp, and unbleached pulp is yellow due to containing a small amount of lignin and colored impurities, so that a bleaching process can be omitted, and the yellowish paper can be directly prepared, so that polluting impurities generated in the bleaching process are reduced, meanwhile, the yellow paper can reduce the intensity of reflected light and increase the tone of the reflected light so as to improve the visual environment and avoid causing visual fatigue to cause myopia, and thus, a good myopia prevention effect is achieved.)

1. The production process of the myopia-preventing paper is characterized in that the paper comprises the following raw materials in percentage by mass: 10-20 parts of wood, 20-30 parts of bamboo, 40-50 parts of cooking liquor, 1-2 parts of oxidizing auxiliary agent and 3-5 parts of starch solution; the preparation method comprises the following specific steps:

s1: crushing wood and bamboo into small wood chips and small bamboo chips by a crusher, and controlling the moisture in the small wood chips and the small bamboo chips to be 40-50%;

s2: putting the small wood chips and the small bamboo chips into a high-pressure digester, simultaneously putting a cooking liquor and an oxidizing auxiliary agent into the digester, and performing pressure-maintaining cooking for 4-6 h at the temperature of 130-150 ℃ to prepare a crude slurry;

s3: washing and separating the crude slurry through a separator, and separating black liquor in the crude slurry to obtain slurry;

s4: conveying the pulp into a hydraulic pulp crusher to be subjected to tearing and mutual friction, so as to crush the pulp;

s5: the crushed pulp is conveyed into a pulping machine, and pulping is carried out to enable pulp fibers to generate the effects of deformation, swelling, crushing, cutting, fibrillation and the like, so that the fiber form is changed, and the mechanical strength and the physical property of the pulp are improved;

s6: purifying and screening the pulped pulp through a slag remover and a pressure screen to remove relatively large impurities in the pulp;

s7: spraying slurry on the grid plate through a head box, and dehydrating and forming the slurry on the grid plate to form paper;

s8: the paper is pressed mechanically, so that the dryness of the paper is improved by further dewatering, and the compactness, strength and surface smoothness of the paper are improved;

s9: spraying starch solution on two sides of the paper, wherein the starch enables the surface of the paper to be smooth and the printing ink can not be dissolved when the paper is used for printing in future;

s10: drying the paper again through the drying box to improve the dryness of the paper to 92-95 percent;

s11: the paper is calendered by a calender to improve the smoothness, gloss and thickness uniformity of the paper.

2. The process for producing a myopia-preventing paper sheet according to claim 1, wherein the cooking liquor is a mixture of sulfurous acid and sulfite.

3. The process for producing a myopia-preventing paper sheet according to claim 1, wherein the oxidizing auxiliary agent is anthraquinone and its derivatives.

4. The process for producing myopia-preventing paper according to claim 1, wherein during cooking pulping, the wood chips and bamboo chips are put into the pot, after the pot is filled, the pot cover is covered, and then cooking liquid is pumped from the lower part of the pot body to make SO escaped from the liquid medicine₂The gas is absorbed by the small wood chips and the small bamboo chips, thereby improving the efficiency of the cooking reaction.

Technical Field

The invention relates to the technical field of paper preparation, in particular to a production process of myopia-preventing paper.

Background

The exercise book, the textbook and the student test paper are important tools for students to study, but as for the exercise book, at least 20 exercise books are averagely used by each person in a school period of primary and secondary school students in China, the number of the primary and secondary school students in China is huge, the demand for the exercise book is huge, and the exercise book, the textbook and the student test paper are made of paper.

In the existing factory, the materials for making workbooks, textbooks and student test papers are all made of the existing virgin pulp white paper directly. In the paper making process, in order to improve the glossiness of paper and obtain white paper, bleaching agents and fluorescent agents are often added in the paper making stage, the bleaching agents commonly used for bleaching paper are chlorine-containing agents, but in the bleaching and dyeing process, when the chlorine-containing agents are mixed with some substances in wood pulp, chemical reactions can be generated to produce substances harmful to human bodies and the environment, and the health of students can be damaged by using exercise books made of the paper in the later stage.

Scientific detection shows that the whiter the paper is, the stronger the light reflected by a fluorescent lamp is, the more harmful the paper is to the eyesight of people, according to the current international universal standard, the whiteness of the paper is not higher than 84 ℃, and the whiteness of the raw wood pulp paper can reach 95-105 ℃, so that the homework book made of the paper produced by the prior art is very unfavorable for protecting the eyesight of students.

Disclosure of Invention

The invention provides a production process of myopia-preventing paper, which is characterized in that the paper is prepared from sulfite wood pulp, wherein the sulfite wood pulp takes a mixed solution of sulfurous acid and acid sulfite as a cooking agent, the pulp has longer fiber, soft property, good toughness, high strength and excellent interweaving capability, and unbleached pulp is yellow due to containing a small amount of lignin and colored impurities, so that a bleaching process can be omitted, a light yellow paper is directly prepared, polluting impurities generated in the bleaching process are reduced, meanwhile, the strength of reflected light can be reduced, the tone of the reflected light is increased, the visual environment is improved, myopia caused by visual fatigue is avoided, and a good myopia-preventing effect is achieved.

In order to solve the technical problems, the invention provides the following technical scheme:

the invention provides a production process of myopia-preventing paper, which comprises the following raw materials in parts by mass: 10-20 parts of wood, 20-30 parts of bamboo, 40-50 parts of cooking liquor, 1-2 parts of oxidizing auxiliary agent and 3-5 parts of starch solution; the preparation method comprises the following specific steps:

s1: crushing wood and bamboo into small wood chips and small bamboo chips by a crusher, and controlling the moisture in the small wood chips and the small bamboo chips to be 40-50%;

s2: putting the small wood chips and the small bamboo chips into a high-pressure digester, simultaneously putting a cooking liquor and an oxidizing auxiliary agent into the digester, and performing pressure-maintaining cooking for 4-6 h at the temperature of 130-150 ℃ to prepare a crude slurry;

s3: washing and separating the crude slurry through a separator, and separating black liquor in the crude slurry to obtain slurry;

s4: conveying the pulp into a hydraulic pulp crusher to be subjected to tearing and mutual friction, so as to crush the pulp;

s5: the crushed pulp is conveyed into a pulping machine, and pulping is carried out to enable pulp fibers to generate the effects of deformation, swelling, crushing, cutting, fibrillation and the like, so that the fiber form is changed, and the mechanical strength and the physical property of the pulp are improved;

s6: purifying and screening the pulped pulp through a slag remover and a pressure screen to remove relatively large impurities in the pulp;

s7: spraying slurry on the grid plate through a head box, and dehydrating and forming the slurry on the grid plate to form paper;

s8: the paper is pressed mechanically, so that the dryness of the paper is improved by further dewatering, and the compactness, strength and surface smoothness of the paper are improved;

s9: spraying starch solution on two sides of the paper, wherein the starch enables the surface of the paper to be smooth and the printing ink can not be dissolved when the paper is used for printing in future;

s10: drying the paper again through the drying box to improve the dryness of the paper to 92-95 percent;

s11: the paper is calendered by a calender to improve the smoothness, gloss and thickness uniformity of the paper.

In a preferred embodiment of the present invention, the cooking liquid is a mixture of sulfurous acid and sulfite.

As a preferable technical scheme of the invention, the oxidizing auxiliary agent is anthraquinone and derivatives thereof.

As a preferred technical scheme of the invention, when cooking and pulping, the small wood chips and the small bamboo chips are firstly put into a pot, after the pot is filled and the pot cover is covered, cooking liquor is pumped from the lower part of the pot body, SO that SO escaped from the liquor₂The gas is absorbed by the small wood chips and the small bamboo chips, thereby improving the efficiency of the cooking reaction.

The invention has the following beneficial effects:

the invention prepares paper by sulfite wood pulp, the sulfite wood pulp takes the mixed solution of sulfurous acid and acid sulfite as a cooking agent, the pulp has longer fiber, soft property, good toughness, high strength and excellent interweaving capability, the unbleached pulp is yellow because of containing a small amount of lignin and colored impurities, so the bleaching process can be omitted, the faint yellow paper can be directly prepared, the polluting impurities generated by the bleaching process are reduced, meanwhile, the yellow paper can reduce the strength of reflected light and increase the tone of the reflected light, the visual environment is improved, the myopia caused by visual fatigue is avoided, and the good myopia prevention effect is achieved.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.

Example 1

The invention provides a production process of myopia-preventing paper, which comprises the following raw materials in parts by mass: 20 parts of wood, 30 parts of bamboo, 50 parts of cooking liquor, 2 parts of oxidizing auxiliary agent and 5 parts of starch solution; the preparation method comprises the following specific steps:

s1: crushing wood and bamboo into small wood chips and small bamboo chips by a crusher, and controlling the moisture in the small wood chips and the small bamboo chips to be 40-50%;

s2: putting the small wood chips and the small bamboo chips into a high-pressure digester, simultaneously putting a cooking liquor and an oxidizing auxiliary agent into the digester, and performing pressure-maintaining cooking for 4-6 h at the temperature of 130-150 ℃ to prepare a crude slurry;

s3: washing and separating the crude slurry through a separator, and separating black liquor in the crude slurry to obtain slurry;

s4: conveying the pulp into a hydraulic pulp crusher to be subjected to tearing and mutual friction, so as to crush the pulp;

s5: the crushed pulp is conveyed into a pulping machine, and pulping is carried out to enable pulp fibers to generate the effects of deformation, swelling, crushing, cutting, fibrillation and the like, so that the fiber form is changed, and the mechanical strength and the physical property of the pulp are improved;

s6: purifying and screening the pulped pulp through a slag remover and a pressure screen to remove relatively large impurities in the pulp;

s7: spraying slurry on the grid plate through a head box, and dehydrating and forming the slurry on the grid plate to form paper;

s8: the paper is pressed mechanically, so that the dryness of the paper is improved by further dewatering, and the compactness, strength and surface smoothness of the paper are improved;

s9: spraying starch solution on two sides of the paper, wherein the starch enables the surface of the paper to be smooth and the printing ink can not be dissolved when the paper is used for printing in future;

s10: drying the paper again through the drying box to improve the dryness of the paper to 92-95 percent;

s11: the paper is calendered by a calender to improve the smoothness, gloss and thickness uniformity of the paper.

Example 2

The invention provides a production process of myopia-preventing paper, which comprises the following raw materials in parts by mass: 10 parts of wood, 20 parts of bamboo, 40 parts of cooking liquor, 1 part of oxidizing auxiliary agent and 3 parts of starch solution; the preparation method comprises the following specific steps:

s1: crushing wood and bamboo into small wood chips and small bamboo chips by a crusher, and controlling the moisture in the small wood chips and the small bamboo chips to be 40-50%;

s2: putting the small wood chips and the small bamboo chips into a high-pressure digester, simultaneously putting a cooking liquor and an oxidizing auxiliary agent into the digester, and performing pressure-maintaining cooking for 4-6 h at the temperature of 130-150 ℃ to prepare a crude slurry;

s3: washing and separating the crude slurry through a separator, and separating black liquor in the crude slurry to obtain slurry;

s4: conveying the pulp into a hydraulic pulp crusher to be subjected to tearing and mutual friction, so as to crush the pulp;

s5: the crushed pulp is conveyed into a pulping machine, and pulping is carried out to enable pulp fibers to generate the effects of deformation, swelling, crushing, cutting, fibrillation and the like, so that the fiber form is changed, and the mechanical strength and the physical property of the pulp are improved;

s6: purifying and screening the pulped pulp through a slag remover and a pressure screen to remove relatively large impurities in the pulp;

s7: spraying slurry on the grid plate through a head box, and dehydrating and forming the slurry on the grid plate to form paper;

s8: the paper is pressed mechanically, so that the dryness of the paper is improved by further dewatering, and the compactness, strength and surface smoothness of the paper are improved;

s9: spraying starch solution on two sides of the paper, wherein the starch enables the surface of the paper to be smooth and the printing ink can not be dissolved when the paper is used for printing in future;

s10: drying the paper again through the drying box to improve the dryness of the paper to 92-95 percent;

s11: the paper is calendered by a calender to improve the smoothness, gloss and thickness uniformity of the paper.

Preferably, the cooking liquor is a mixture of sulfurous acid and sulfite.

Preferably, the oxidizing auxiliary agent is anthraquinone and its derivatives.

Preferably, when cooking and pulping, the small wood chips and the small bamboo chips are firstly put into the pot, after the pot cover is covered after the pot is filled, cooking liquid is pumped from the lower part of the pot body, SO that SO2 gas escaping from the liquid medicine is absorbed by the small wood chips and the small bamboo chips, and the cooking reaction efficiency is improved.

The invention prepares paper by sulfite wood pulp, the sulfite wood pulp takes the mixed solution of sulfurous acid and acid sulfite as a cooking agent, the pulp has longer fiber, soft property, good toughness, high strength and excellent interweaving capability, the unbleached pulp is yellow because of containing a small amount of lignin and colored impurities, so the bleaching process can be omitted, the faint yellow paper can be directly prepared, the polluting impurities generated by the bleaching process are reduced, meanwhile, the yellow paper can reduce the strength of reflected light and increase the tone of the reflected light, the visual environment is improved, the myopia caused by visual fatigue is avoided, and the good myopia prevention effect is achieved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.