阅读说明：本技术 一种防近视作业本及其制备方法 (Myopia-preventing exercise book and preparation method thereof ) 是由 刘绅礼 于 2019-10-29 设计创作，主要内容包括：本发明公开了一种防近视作业本及其制备方法,所述防近视作业本由下述重量份的原料制成,针叶木浆250-290份、APMP杨木浆100-120份、草浆500-600份、浆内淀粉9-11份、液体黄0.14-0.19份、消泡剂0.4-0.6份、杀菌剂0.4-0.6份、重钙234-260份、轻钙126-140份、氧化淀粉55-60份、淀粉增强剂3.5-4.5份、AKD 25-30份。本发明的有益效果为：本发明所述防近视作业本的纸张不含荧光增白剂,纸张颜色为淡黄色,反射光主波长为560-590纳米,CIE颜色空间色度值为：L≥85.0,a为0.0±3.0,b为12.0±4.0,白度在70％-75％,此颜色和白度范围纸张反差适宜,不易造成人眼疲劳,有效地改善白色全谱光对视力的影响,达到一定的防近视作用。本发明所述防近视作业本采用冷胶平摊裹背的方式装订,使所述作业本可以进行180度平摊,方便书写和阅读。(The invention discloses an anti-myopia exercise book and a preparation method thereof, wherein the anti-myopia exercise book is prepared from the following raw materials, by weight, 290 parts of softwood pulp, 120 parts of APMP poplar pulp, 600 parts of straw pulp, 9-11 parts of starch in pulp, 0.14-0.19 part of liquid yellow, 0.4-0.6 part of an antifoaming agent, 0.4-0.6 part of a bactericide, 260 parts of heavy calcium 234-. The invention has the beneficial effects that: the paper of the anti-myopia exercise book does not contain a fluorescent whitening agent, the color of the paper is light yellow, the dominant wavelength of reflected light is 560-590 nanometers, and the CIE color space chroma value is as follows: l is more than or equal to 85.0, a is 0.0 +/-3.0, b is 12.0 +/-4.0, and whiteness is 70-75 percent. The anti-myopia exercise book is bound in a mode of evenly spreading and wrapping the back with the cold glue, so that the exercise book can be evenly spread by 180 degrees, and writing and reading are facilitated.)

1. The myopia prevention exercise book is characterized by being prepared from the following raw materials, by weight, 290 parts of softwood pulp, 120 parts of APMP poplar pulp, 600 parts of straw pulp, 9-11 parts of starch in pulp, 0.14-0.19 part of liquid yellow, 0.4-0.6 part of an antifoaming agent, 0.4-0.6 part of a bactericide, 260 parts of heavy calcium 234-.

2. The myopia prevention exercise book according to claim 1, which is characterized by being prepared from 270 parts of softwood pulp, 110 parts of APMP poplar pulp, 550 parts of straw pulp, 10 parts of starch in pulp, 0.16 part of liquid yellow, 0.5 part of defoaming agent, 0.5 part of bactericide, 256 parts of heavy calcium, 130 parts of light calcium, 58 parts of oxidized starch, 4 parts of starch reinforcing agent and 28 parts of AKD.

3. A method of preparing an anti-myopia exercise book according to any one of claims 1 to 2, comprising the steps of:

(1) preparing straw pulp;

(2) respectively treating softwood pulp and APMP poplar pulp by a hydrapulper, a non-beating tank, a refiner and a beating tank in sequence, and conveying the obtained raw materials to a pulp mixing tank; treating the grass pulp in a non-beating pulp tank, a pulping machine and a beating pulp tank in sequence, and conveying the obtained raw materials to a pulp mixing tank;

(3) adding liquid yellow, starch in the slurry, a defoaming agent and a bactericide into a slurry mixing tank, mixing and stirring uniformly, and treating the mixture in a slurry pouring tank and a slurry forming tank in sequence to obtain slurry;

(4) the pulp is sequentially processed by a high-position box, a slushing pump, a slag separator, a pressure screen, a pulp stabilizing box, a pulp flowing box, a net part, a squeezing part, a drying part, surface sizing, a drying part, coiling and paper cutting to obtain the myopia-preventing paper, an AKD adding device is arranged between the slushing pump and the slag separator, and a heavy calcium adding device and a light calcium adding device are arranged between the pressure screen and the pulp stabilizing box; an oxidized starch and starch reinforcing agent mixture adding device is arranged between the drying part and the surface sizing;

(5) and binding the myopia-preventing paper to obtain the myopia-preventing exercise book.

4. The method for preparing an anti-myopia exercise book according to claim 3, wherein in the step (1), the method for preparing the straw pulp comprises the following steps:

1.1, crushing the dried straws to the length of 15-20 mm;

1.2, sequentially putting the crushed straws and ammonium sulfite into a reaction kettle, reacting under the conditions of heating and pressurizing, releasing straw pulp after the reaction is finished, and carrying out pulp squeezing and defibering treatment on the obtained straw pulp;

and 1.3, feeding the treated straw pulp into an oxygen delignification reaction tower for treatment, and diluting and washing the obtained pulp to obtain the straw pulp.

5. The method for preparing the myopia prevention exercise book according to claim 4, wherein in the step (1.2), the weight ratio of the straw to the ammonium sulfite is 100: 9-10.

6. The method for preparing a exercise book for preventing myopia according to claim 4, wherein in the step (1.2), after the straw and ammonium sulfite react for 18-22min at a heating temperature of 120-130 ℃ and a pressure of 0.22-0.25MPa, the reaction pressure is adjusted to 0.04-0.06MPa and a temperature of 155-165 ℃ for 80-100 min.

7. The method for preparing exercise book for preventing myopia according to claim 4, wherein in the step (1.3), the treated straw pulp, sodium hydroxide and magnesium sulfate are sequentially added into the oxygen delignification reaction tower, and the treatment is performed for 70-90min under the conditions that the oxygen consumption is 30-40kg/t straw pulp, the inlet temperature of the oxygen delignification reaction tower is 90-100 ℃, the pressure is 0.8-1.0MPa, and the top temperature of the oxygen delignification reaction tower is 95-105 ℃.

8. The method for preparing an anti-myopia exercise book according to claim 3, wherein in the step (5), the binding method comprises the following steps:

5.1, printing inner core grid lines on the anti-myopia paper;

5.2, performing fracture lines along the central axis of the myopia-preventing paper, wherein round holes are uniformly distributed along the length direction of the fracture lines;

5.3, folding the myopia-preventing paper along the cracking line to form folded paper with folded edges;

5.4, overlapping a plurality of folded paper to form paper collection; respectively placing a front cover and a back cover on the upper surface and the lower surface of the paper collection to form a workbook to be bound;

and 5.5, trimming the paper to prepare a back wrapping strip, wrapping the to-be-bound workbook with the back wrapping strip to contain edges of the folded edges, coating glue on the surfaces of the back wrapping strip, which are in contact with the to-be-bound workbook, and drying to obtain the myopia prevention workbook.

9. The method for preparing an exercise book for preventing myopia according to claim 8, wherein in step (5.5), the length of the wrapping strip is equal to the length of the folded edge, and the overlapping part of the width of the wrapping strip and the width of the cover accounts for 3% -5% of the width of the cover; the thickness of the back wrapping strip is 0.1-0.2mm, and the weight ratio of the coated glue to the weight of the workbook to be bound is 0.007-0.009: 1.

10. The method for preparing an anti-myopia exercise book according to claim 8, wherein in the step (5.5): the drying temperature is 115-125 ℃, and the drying time at the temperature is 2-4 min.

Technical Field

The invention relates to the technical field of cultural goods, in particular to an anti-myopia exercise book and a preparation method thereof.

Background

As social competition is intensified, students are burdened more and more in academic, and investigation shows that the myopia incidence rate of China tends to be gradually reduced, the myopia incidence rates of primary school students, middle school students, high school students and college students in China are respectively 22%, 55%, 70% and 86%, the myopia incidence rate of China is the first in the world, and the high myopia incidence rate has to cause thinking. The incidence of myopia is directly related to the environment where people use the eyes, and the myopia is caused by long-time reading and writing and unregulated watching of mobile phone and television screens. In the current society, myopia is one of the common diseases of primary and secondary school students, and seriously harms the normal life, study and physical and mental health growth of the primary and secondary school students.

In 2023, the implementation scheme aims to achieve that the total myopia rate of the national children and teenagers is reduced by more than 0.5 percent per year on the basis of 2018, the myopia high-rate province is reduced by more than 1 percent per year, the myopia rate of the children and teenagers is obviously reduced newly and the overall level of the vision health is obviously improved by more than 2030, the myopia rate of the children and teenagers in 6 years is controlled to be about 3 percent, the myopia rate of pupils is reduced to below 38 percent, the myopia rate of juniors is reduced to below 60 percent, and the myopia rate of students in high and middle stages is reduced to below 70 percent.

At present, most of the visual fatigue is caused directly or indirectly by school life, and one important reason is to use unqualified textbooks. Most of paper used in the current exercise book is white, the white paper has white full-frequency reflection capacity and has strong stimulation to human eyes, and people watch the white paper for a long time, so that eye fatigue is easily caused and the human eyes are damaged.

The myopia prevention exercise book is a powerful measure for strengthening the myopia prevention and treatment work of children and teenagers and protecting the body health of the children and the teenagers. Different colors and whiteness of the book paper are different from each other in eye stimulation, and experts compare different color books through research to find that the eye fatigue incidence rate of the white book is highest, the eye fatigue incidence rate of the book made of the yellow paper is lowest, and the eye fatigue incidence rate has a direct relation with the book color. Therefore, the school notebook market for primary and middle school students urgently needs a myopia prevention school notebook which can scientifically reduce the incidence of myopia of students.

Disclosure of Invention

The invention aims to provide a myopia prevention exercise book capable of preventing myopia and a preparation method thereof.

An anti-myopia exercise book is prepared from 290 parts of softwood pulp, 120 parts of APMP poplar pulp, 600 parts of straw pulp, 9-11 parts of starch in pulp, 0.14-0.19 part of liquid yellow, 0.4-0.6 part of defoaming agent, 0.4-0.6 part of bactericide, 260 parts of heavy calcium 234-.

Further, the myopia prevention exercise book is made of raw materials, by weight, 270 parts of softwood pulp, 110 parts of APMP poplar pulp, 550 parts of straw pulp, 10 parts of starch in pulp, 0.16 part of liquid yellow, 0.5 part of defoaming agent, 0.5 part of bactericide, 256 parts of heavy calcium, 130 parts of light calcium, 58 parts of oxidized starch, 4 parts of starch reinforcing agent and 28 parts of AKD.

The defoaming agent is fatty alcohol, and the bactericide is chlorine dioxide.

The starch reinforcing agent is a high molecular substance formed by special crosslinking, is a hydroxyl-rich high molecular substance, can effectively interweave glucose chains of starch into a net structure in the starch pasting process, improves the strength, enhances the starch sizing effect, improves the strength of starch film forming, improves the smoothness of paper, improves the surface strength by 30 percent, improves the stiffness of the paper and improves the printing performance.

AKD is an abbreviation for alkyl ketene dimer, an internal sizing agent commonly used in papermaking.

The preparation method of the myopia prevention exercise book comprises the following steps:

(1) preparing straw pulp; the raw material for preparing the straw pulp can be crop straws,

(2) respectively treating softwood pulp and APMP poplar pulp by a hydrapulper, a non-beating tank, a pulping machine and a beating tank in sequence, and conveying the obtained raw materials to a pulp mixing tank; treating the grass pulp in a non-beating pulp tank, a pulping machine and a beating pulp tank in sequence, and conveying the obtained raw materials to a pulp mixing tank;

(3) adding liquid yellow, starch in the slurry, a defoaming agent and a bactericide into a slurry mixing tank, mixing and stirring uniformly, and treating the mixture in a slurry pouring tank and a slurry forming tank in sequence to obtain slurry; the liquid yellow is purchased from Taichow dyeing limited company in Luoyang, and the main component of the liquid yellow is alkaline light yellow;

(4) the pulp is sequentially processed by a high-position box, a slushing pump, a slag separator, a pressure screen, a pulp stabilizing box, a pulp flowing box, a net part, a squeezing part, a drying part, surface sizing, a drying part, coiling and paper cutting to obtain the myopia-preventing paper, an AKD adding device is arranged between the slushing pump and the slag separator, and a heavy calcium adding device and a light calcium adding device are arranged between the pressure screen and the pulp stabilizing box; an oxidized starch and starch reinforcing agent mixture adding device is arranged between the drying part and the surface sizing; the adding device is an adder for adding raw materials, and the oxidized starch and the starch reinforcing agent are added after being decocted;

(5) and binding the myopia-preventing paper to obtain the myopia-preventing exercise book.

The main components of the papermaking fiber raw materials such as straws and the like are cellulose, hemicellulose and lignin, wherein the color of the cellulose and the hemicellulose is white, and the color of the lignin is brown, so the lignin is the main source of the paper color, and the purpose of cooking in a reaction kettle by heating under pressure is to remove the lignin as much as possible and simultaneously protect the cellulose and the hemicellulose from degradation.

The temperature and time of cooking are increased to be beneficial to removing lignin, the whiteness of the produced pulp is high, but the severe reaction conditions can cause the cellulose and hemicellulose to be greatly degraded, so that the strength (such as long fracture, folding endurance and the like) of the pulp is poor, on the contrary, the residual lignin content in the pulp is too high and the color of the pulp is very deep due to the excessively low cooking temperature and time, so that the factors of the whiteness and the strength of the finished pulp are comprehensively considered in the set cooking temperature and time, and the excessively high and low are not good. Therefore, the invention gradually raises the temperature and reduces the pressure to reach the state of balance among lignin, cellulose and hemicellulose in the pulp in the preparation process of the straw pulp.

In addition, the whiteness and the strength can not be simultaneously considered by only depending on cooking, so the oxygen delignification reaction tower is used for supplementary delignification in the invention, the kappa number of the finished pulp can be reduced from 27 before the oxygen delignification to 16 without bleaching on the premise of not reducing the strength of the paper pulp, and the paper pulp can be directly used for producing low-whiteness paper. (Note: kappa number, also called kappa number, indicates the lignin content in the pulp, which is one of the indexes reflecting the degree of delignification in the pulp)

Further, in the step (1), the preparation method of the straw pulp comprises the following steps:

1.1, crushing the dried straws to the length of 15-20 mm;

1.2, sequentially putting the crushed straws and ammonium sulfite into a reaction kettle, reacting under the conditions of heating and pressurizing, releasing straw pulp after the reaction is finished, and carrying out pulp squeezing and defibering treatment on the obtained straw pulp;

and 1.3, feeding the treated straw pulp into an oxygen delignification reaction tower for treatment, and diluting and washing the obtained pulp to obtain the straw pulp.

Further, in the step (1.2), the weight ratio of the straws to the ammonium sulfite is 100: 9-10.

Further, in the step (1.2), after the straw and the ammonium sulfite react for 18-22min at the heating temperature of 120-130 ℃ and the pressure of 0.22-0.25MPa, the reaction pressure is adjusted to 0.04-0.06MPa and the temperature of 155-165 ℃, and the reaction is carried out for 80-100min under the conditions.

Further, in the step (1.3), the treated straw pulp, sodium hydroxide and magnesium sulfate are sequentially added into an oxygen delignification reaction tower, and stay for treatment for 70-90min under the conditions that the oxygen consumption is 30-40kg/t of straw pulp, the inlet temperature of the oxygen delignification reaction tower is 90-100 ℃, the pressure is 0.8-1.0MPa, and the tower top temperature of the oxygen delignification reaction tower is 95-105 ℃.

Further, in the step (5), the binding method includes the steps of:

5.1, printing inner core grid lines on the anti-myopia paper;

5.2, performing fracture lines along the central axis of the myopia-preventing paper, wherein round holes are uniformly distributed along the length direction of the fracture lines;

5.3, folding the myopia-preventing paper along the cracking line to form folded paper with folded edges;

5.4, overlapping a plurality of folded paper to form paper collection; respectively placing a front cover and a back cover on the upper surface and the lower surface of the paper collection to form a workbook to be bound;

and 5.5, trimming the paper to prepare a back wrapping strip, wrapping the workbook to be bound with the back wrapping strip to contain edges of the folded edges, coating glue on the surfaces of the back wrapping strip, which are in contact with the workbook to be bound, and drying to obtain the anti-myopia workbook. As a preferred embodiment, the glue is latex.

The bag back strip is special paper, and is white kraft paper with the folding endurance of 840 times.

Further, in the step (5.5), the length of the back wrapping strip is equal to that of the folded edges, and the overlapped part of the width of the back wrapping strip and the width of the front cover accounts for 3% -5% of the width of the front cover; the thickness of the back wrapping strip is 0.1-0.2mm, and the weight ratio of the coated glue to the weight of the workbook to be bound is 0.007-0.009: 1.

Further, in step (5.5): the drying temperature is 115-125 ℃, and the drying time at the temperature is 2-4 min.

The design size of the inner core grid line of the myopia prevention exercise book paper is as follows:

the invention has the beneficial effects that: the paper of the anti-myopia exercise book does not contain a fluorescent whitening agent, so that the amount of blue light (with the wavelength of 400nm) which is most irritating to eyes in reflected light of the paper is reduced, and light pollution is reduced. The paper of the myopia prevention exercise book is light yellow, the dominant wavelength of reflected light is 560 + 590 nanometers, and the spatial chromaticity value of CIE color is as follows: l is more than or equal to 85.0, a is 0.0 +/-3.0, b is 12.0 +/-4.0, and whiteness is 70-75 percent, the contrast between the paper in the color and whiteness range is proper, and the human eye fatigue is not easy to cause, so that the influence of white full-spectrum light on the vision is effectively improved, and a certain myopia prevention effect can be achieved.

The myopia prevention exercise book disclosed by the invention is characterized in that suitable different inner core grid line specifications are respectively used according to different stage characteristics of primary and middle schools, so that the influence of students on eyesight caused by writing small characters is avoided, and in addition, the myopia prevention exercise book disclosed by the invention is bound in a cold glue spreading back wrapping mode, so that the exercise book can be spread at 180 degrees, and the writing and reading are convenient.

Drawings

FIG. 1 is a schematic structural diagram of an anti-myopia exercise book according to the present invention;

FIG. 2 is a schematic structural view of a back strip of the myopia prevention exercise book package of the present invention;

FIG. 3 is a schematic structural diagram of the anti-myopia paper of the anti-myopia exercise book of the present invention;

fig. 4 is a schematic structural view of the myopia prevention exercise book of the present invention when spread out.

In the figure: 1. wrapping a back strip; 2. a cover; 3. anti-myopia paper; 4. cracking line

Detailed Description