CN112878108A - Preparation process of environment-friendly anti-myopia paper - Google Patents
Preparation process of environment-friendly anti-myopia paper Download PDFInfo
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- CN112878108A CN112878108A CN202110206252.XA CN202110206252A CN112878108A CN 112878108 A CN112878108 A CN 112878108A CN 202110206252 A CN202110206252 A CN 202110206252A CN 112878108 A CN112878108 A CN 112878108A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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- Dispersion Chemistry (AREA)
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Abstract
The invention discloses a preparation process of environment-friendly myopia prevention paper, which adopts a mixture of waste paper and straws as a raw material and comprises the following specific steps: a. cutting the straws into sheets, removing impurities and dehydrating; b. putting the straws into a solvent for mixing; c. boiling to remove impurities to prepare straw unbleached pulp; d. crushing waste paper, adding hot water, and making into paper pulp; e. d, deinking the paper pulp obtained in the step d to obtain waste paper pulp; f. straw unbleached pulp, waste paper pulp and porous filler are uniformly mixed to form mixed slurry; g. carrying out hot grinding dissociation on the mixed pulp, and taking the ground pulp as paper making pulp; h. the environment-friendly anti-myopia paper is prepared by a pulp papermaking machine for papermaking. The preparation process is environment-friendly, saves resources, protects eyesight by properly reducing whiteness and brightness of paper while ensuring the properties of paper tensiometry, physics and the like, protects environment by reducing the use of plant fibers and various chemical dyes, saves resources, has simple production process and has obvious social, economic and environmental benefits.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation process of environment-friendly myopia-preventing paper.
Background
Most of the paper used in the current books is white and is characterized by strong brightness. The human eye perceives the character by the color and brightness contrast of the paper to the character, the whiter the paper the stronger the reflected light, which causes the greatest visual fatigue while causing the greatest brightness contrast. The stronger the light, the greater the degree of visual fatigue, regardless of the length of the visual range, the ciliary muscle is in the excessive contraction state, the forward movement of the visual point, and the visual environment becomes the reason of the approach of the visual range, which is very easy to cause myopia.
The myopia-preventing paper can emit colored light with specific frequency, create a safe and comfortable visual environment, reduce visual fatigue to the maximum extent, fully exert two visual functions of color sensing and light sensing, and effectively eliminate objective factors causing myopia. The myopia prevention paper can be used for preventing and treating myopia simply, conveniently and effectively, and meanwhile, pseudomyopia can be recovered to be normal automatically in a good visual environment, so that true myopia is not deepened any more, and the myopia prevention paper has an incomparable effect and is particularly suitable for teachers and students.
The prior myopia-preventing paper is generally manufactured by adding a proper amount of yellow dye into bleached white paper pulp, so that the paper becomes yellow, the wavelength of reflected light of the paper is changed, the stimulation of the reflected light to human eyes is reduced, and the purpose of preventing myopia is achieved.
Chinese patent CN103225235A discloses a myopia-preventing paper and a preparation method and application thereof, comprising the following steps: a. crushing wheat straw; b. adding sodium sulfite, sodium hydroxide and anthraquinone into wheat straw fiber, and fully mixing; c. b, putting the mixture prepared in the step b into water for cooking to form paper pulp, and sieving the cooked pulp to remove coarse impurities; d. c, adding liquid chlorine, sodium hydroxide and sodium hypochlorite into the pulp prepared in the step c, and bleaching the pulp; e. adding alkaline bright yellow, acid violet, aluminum sulfate, rosin size, dithionous acid oil and a surface sizing fixative into the slurry prepared in the step d to adjust the color of the paper pulp; f. and finally, according to the thickness requirement of the myopia-preventing paper, spreading the paper pulp prepared in the step e on a forming net to obtain the finished myopia-preventing paper.
For another example, chinese patent CN104611983A discloses a method for producing myopia-preventing paper, which comprises the following steps: (1) crushing waste paper or wheat straw into paper pulp by a pulper; (2) sieving the obtained paper pulp through a pressure sieve; (3) performing fiber separation on the shredded paper pulp by using a fiber separator; (4) mixing and coloring the separated fiber, and adding the alkaline bright yellow, aluminum sulfate and rosin size into the fiber slurry; (5) and (4) dewatering and forming, namely drying, dewatering and forming the mixed pulp to obtain the myopia-preventing paper.
The two inventions are that the color of the paper pulp is adjusted by adding dye and fixing agent after the paper pulp is bleached, so as to prepare the anti-myopia paper. However, the use of bleaching agents and dyes causes a certain pollution to the environment, and destroys the ecological environment. And not all yellow papers can play a role in preventing myopia.
Chinese patent CN104611983A discloses a production method of myopia-preventing paper, which comprises the following steps: (1) respectively preparing waste tissue paper deinking pulp, softwood pulp and wheat straw pulp; (2) uniformly mixing the waste tissue paper deinking pulp, the softwood pulp and the wheat straw pulp to obtain mixed pulp, wherein the weight percentages of the waste tissue paper deinking pulp, the softwood pulp and the wheat straw pulp are as follows: 55-65% of waste brochure paper deinking pulp, 10-15% of softwood pulp and the balance of wheat straw pulp to 100%; (3) sieving the obtained mixed pulp by a pressure sieve, and performing fiber separation on the mixed pulp by a fiber separator to control the fiber purity to be more than 95 percent and the impurity removal rate to be more than 95 percent; (4) adding the alkaline light yellow, the lemon yellow and the light fast yellow into the separated fiber slurry, and uniformly mixing to obtain coloring slurry; (5) and adding a papermaking auxiliary agent into the upper color sizing material, and feeding the mixture into a paper machine for papermaking, dewatering and drying to obtain the myopia-preventing paper. The anti-myopia paper is prepared from waste brochure paper deinking pulp, softwood pulp and wheat straw pulp, wastes are recycled, but the alkaline light yellow, lemon yellow and sun-proof yellow are compounded for use, and dyes can cause certain pollution to the environment.
Disclosure of Invention
The invention aims to provide the preparation process of the environment-friendly myopia-preventing paper aiming at the defects in the prior art, the preparation process is environment-friendly and saves resources, the whiteness and the brightness of the paper are properly reduced to protect the eyesight while the properties of the tension, the physics and the like of the paper are ensured, the use of plant fibers and various chemical dyes is reduced to protect the environment and save the resources, the production process of the paper is simple, and the environment-friendly myopia-preventing paper has obvious social, economic and environmental benefits.
The invention aims to solve the problems by the following technical scheme:
the preparation process of the environment-friendly myopia prevention paper adopts a mixture of waste paper and straw as a raw material and comprises the following specific steps:
a. cutting the straws into pieces with the length of 1-2 cm, removing impurities by a grass washing machine, and then dehydrating;
b. putting the dehydrated flaky straws into a container containing a solvent, and uniformly mixing, wherein the solvent contains a swelling agent, a cooking agent and water;
c. heating the container in the step b, cooking the straws and removing impurities in the slurry to prepare straw unbleached pulp with the whiteness of 40-55 percent and the concentration of 15-25 percent;
d. crushing waste paper into pieces of lmm-4 mm by a pulper, putting the pieces into a container, adding hot water into the container, and uniformly mixing to prepare paper pulp with the concentration of 15-20%;
e. d, deinking the paper pulp obtained in the step d, separating ink impurities on paper pulp fibers and removing impurities in the paper pulp to obtain deinked waste paper pulp with the whiteness of 65-75%;
f. uniformly mixing the straw unbleached pulp prepared in the step c, the waste paper pulp prepared in the step e and the porous filler to form mixed slurry, wherein the mass mixing ratio of the components is as follows: 20 to 50 percent of straw unbleached pulp, 20 to 50 percent of waste paper pulp and 20 to 30 percent of porous filler, wherein the sum of the mass percentages of the components is 100 percent;
g. f, carrying out hot grinding dissociation on the mixed slurry prepared in the step f, wherein the beating degree of the ground slurry is 35-45 DEG SR, and the ground slurry is sent into a slurry pool to be used as paper making slurry;
h. papermaking pulp is used in papermaking machines to make paper.
The swelling agent in the step b is formed by combining sodium hydroxide accounting for 5 to 15 mass percent of the straws and a silicon compound accounting for 0.2 to 0.5 mass percent of the straws; the cooking agent is formed by combining sodium sulfite accounting for 2 to 6 mass percent of the straws and anthraquinone accounting for 0.02 to 0.05 mass percent of the straws.
The cooking temperature in the step c is 100-180 ℃, the cooking time is lh-2 h, then the temperature is kept at 150-180 ℃, the soaking time is 0.5-1.5 h, the flaky straws are softened, and the straw unbleached pulp with the whiteness of 40-55% and the concentration of 15-25% is prepared.
The temperature of the hot water in the step d is 70-90 ℃.
And e, deinking treatment in the step e adopts ionic liquid and enzyme treatment combined deinking.
The porous filler in the step f has the characteristics of porosity and large specific surface area, the whiteness of the porous filler is not less than 80%, the average particle size range is 10-25 mu m, and the density is 1-2 g/cm3。
The porous filler in the step f is one or a mixture of more of porous calcium silicate, zeolite, titanium dioxide and diatomite.
And (h) drying the paper in the step h by adopting a net grain surface pressing roller and a net grain drying cylinder in the forming, pressing and drying processes, and leading the surface of the finished product paper to present a frosted matte net grain surface by utilizing mesh guidance.
Compared with the prior art, the invention has the following advantages:
the preparation process of the invention replaces plant fiber paper pulp with waste paper and waste straw, fully utilizes waste resources, realizes comprehensive utilization, not only protects the environment, but also reduces the cost and saves the energy consumption.
The preparation process of the invention adopts the porous filler instead of the chemical dye, and utilizes the high diffuse reflection and the unique optical performance of the porous filler to produce the paper with the diffuse reflection light, thereby reducing the chromatic light reflection, playing the role of preventing myopia and avoiding the chemical pollution and the environmental pollution; meanwhile, the porous filler is necessary in the paper pulp, the physical and mechanical properties of the paper are not changed, the whiteness is also controllable, and the paper is easier to recycle due to no addition of chemical dye.
The paper prepared by the invention adopts the mesh surface press roll and the mesh drying cylinder for drying in the forming, squeezing and drying processes, so that the surface of the finished product paper presents a matte mesh surface which is not smooth, and no matter which angle the light irradiates on the paper surface, the light can be diffusely reflected, the light irritation to eyes can be greatly weakened, but the absorption of the printing ink and the definition of writing in the printing process are not influenced, and the writing smoothness is also not influenced; meanwhile, the reticulate patterns are uniformly arranged on the front side and the back side of the paper, so that the difference between the two sides of the printing paper is reduced, and the printing paper looks beautiful and soft.
The preparation process has simple production conditions, does not need surface sizing, and further reduces the cost.
Detailed Description
The present invention will be further described with reference to the following examples.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose, the following embodiments and effects of the present invention are described in detail.
The preparation process of environment-friendly myopia-preventing paper adopts a mixture of waste paper and straws as a raw material, and comprises the following specific steps:
a. cutting the straws into pieces with the length of 1-2 cm, removing impurities by a grass washing machine, and then dehydrating;
b. placing the dehydrated flaky straws into a container containing a solvent, and uniformly mixing, wherein the solvent contains a swelling agent, a cooking agent and water, the swelling agent is formed by combining sodium hydroxide accounting for 5-15% of the mass fraction of the straws and a silicon compound accounting for 0.2-0.5% of the mass fraction of the straws, and the cooking agent is formed by combining sodium sulfite accounting for 2-6% of the mass fraction of the straws and anthraquinone accounting for 0.02-0.05% of the mass fraction of the straws;
c. b, heating the container in the step b to cook the straws, wherein the cooking temperature is 100-180 ℃, the cooking time is lh-2 h, then keeping the temperature at 150-180 ℃, and soaking for 0.5-1.5 h to soften the sheet straws and remove impurities in the slurry, so as to prepare the straw unbleached pulp with the whiteness of 40-55% and the concentration of 15-25%;
d. crushing waste paper into pieces of lmm-4 mm by a pulper, putting the pieces into a container, adding hot water with the temperature of 70-90 ℃ into the container, and uniformly mixing to prepare paper pulp with the concentration of 15-20%;
e. d, performing ionic liquid and enzyme treatment combined deinking treatment on the paper pulp prepared in the step d, separating ink impurities on paper pulp fibers and removing impurities in the paper pulp to obtain deinked waste paper pulp with the whiteness of 65-75%;
f. uniformly mixing the straw unbleached pulp prepared in the step c, the waste paper pulp prepared in the step e and the porous filler to form mixed slurry, wherein the mass mixing ratio of the components is as follows: 20 to 50 percent of straw unbleached pulp, 20 to 50 percent of waste paper pulp and 20 to 30 percent of porous filler, wherein the sum of the mass percentages of the components is 100 percent;
g. f, carrying out hot grinding dissociation on the mixed slurry prepared in the step f, wherein the beating degree of the ground slurry is 35-45 DEG SR, and the ground slurry is sent into a slurry pool to be used as paper making slurry;
h. papermaking pulp is used in papermaking machines to make paper.
Furthermore, in the step f, porous filler with porosity and large specific surface area is added into the straw unbleached pulp and the waste paper pulp, the porous filler is one or a mixture of more of porous calcium silicate, zeolite, titanium dioxide and diatomite, the surface of the porous filler is rough and uneven, and is porous like a honeycomb, has more pores and small density, can diffuse reflection on light, and has whiteness of not less than 80 percent, so that the obtained paper can diffuse reflection, and the whiteness and the brightness are properly reduced,The eyesight is effectively protected; the porous filler has an average particle diameter of 10 to 25 μm and a density of 1 to 2g/cm3The mass percentage of the added porous filler accounts for 20-30% of the total mass of the mixed slurry, and if a plurality of porous fillers are mixed, the porous fillers can be compounded in equal proportion, and the mass percentage still accounts for 20-30% of the total mass of the mixed slurry.
Furthermore, in the step h, the paper is dried by adopting a net pattern surface pressing roller and a net pattern drying cylinder in the forming, squeezing and drying processes, so that the surface of the finished product paper presents a matte net pattern surface which is not smooth, and the matte net pattern surface can be diffusely reflected no matter which angle the light irradiates on the paper surface, thereby greatly weakening the light irritation to eyes, but not influencing the absorption of the printing ink and the definition of writing in the printing process, and not influencing the writing fluency; meanwhile, the reticulate patterns are uniformly arranged on the front side and the back side of the paper, so that the difference between the two sides of the printing paper is reduced, and the printing paper looks beautiful and soft.
Example one
The preparation process of environment-friendly myopia-preventing paper adopts a mixture of waste paper and straws as a raw material, and comprises the following specific steps:
a. cutting the straws into pieces with the length of 1-2 cm, removing impurities by a grass washing machine, and then dehydrating;
b. placing the dehydrated flaky straws into a container, adding a swelling agent and a cooking agent into the container: the swelling agent is formed by combining sodium hydroxide accounting for 5 percent of the mass fraction of the straws and silicon compounds accounting for 0.2 percent of the mass fraction of the straws, the cooking agent is formed by combining sodium sulfite accounting for 2 percent of the mass fraction of the straws and anthraquinone accounting for 0.02 percent of the mass fraction of the straws, and water is added and mixed uniformly;
c. b, heating the container in the step b and cooking the straws, wherein the cooking temperature is 120 ℃, the cooking time is lh, then keeping the temperature at 150 ℃, and soaking for 0.5h to soften the sheet straws and remove impurities in the slurry, so as to prepare straw unbleached pulp with the whiteness of 45% and the concentration of 15% for later use;
d. crushing waste paper into pieces of lmm-4 mm by a pulper, putting the pieces into a container, adding hot water with the temperature of 70 ℃ into the container, and uniformly mixing to prepare paper pulp with the concentration of 15%;
e. d, performing ionic liquid and enzyme treatment combined deinking treatment on the paper pulp prepared in the step d, separating ink impurities on paper pulp fibers and removing impurities in the paper pulp to obtain deinked waste paper pulp with the whiteness of 65% for later use;
f. uniformly mixing the straw unbleached pulp prepared in the step c, the waste paper pulp prepared in the step e and porous calcium silicate to form mixed slurry, wherein the mass mixing ratio of the components is as follows: 20 percent of straw unbleached pulp, 50 percent of waste paper pulp and 30 percent of porous calcium silicate, wherein the sum of the mass percentages of the components is 100 percent;
g. f, carrying out hot grinding dissociation on the mixed slurry prepared in the step f, wherein the beating degree of the ground slurry is 35 DEG SR, and the ground slurry is sent into a slurry pool to be used as paper making slurry;
h. preparing paper by a pulp papermaking machine for papermaking; and the paper is dried by adopting a net pattern surface pressing roller and a net pattern drying cylinder in the production and drying process, so that a matte net pattern surface is formed on the surface of the finished product paper.
Example two
The preparation process of environment-friendly myopia-preventing paper adopts a mixture of waste paper and straws as a raw material, and comprises the following specific steps:
a. cutting the straws into pieces with the length of 1-2 cm, removing impurities by a grass washing machine, and then dehydrating;
b. placing the dehydrated flaky straws into a container, adding a swelling agent and a cooking agent into the container: the swelling agent is formed by combining sodium hydroxide accounting for 15 percent of the mass fraction of the straws and silicon compounds accounting for 0.5 percent of the mass fraction of the straws, the cooking agent is formed by combining sodium sulfite accounting for 6 percent of the mass fraction of the straws and anthraquinone accounting for 0.05 percent of the mass fraction of the straws, water is added, and the mixture is uniformly mixed;
c. b, heating the container in the step b and cooking the straws, wherein the cooking temperature is 180 ℃, the cooking time is 2 hours, then the temperature is kept at 180 ℃, and the straws are soaked for 1.5 hours, so that the sheet straws are softened, impurities in the slurry are removed, and the straw unbleached pulp with the whiteness of 55 percent and the concentration of 25 percent is prepared for later use;
d. crushing waste paper into pieces of lmm-4 mm by a pulper, putting the pieces into a container, adding hot water with the temperature of 90 ℃ into the container, and uniformly mixing to prepare paper pulp with the concentration of 20%;
e. d, performing ionic liquid and enzyme treatment combined deinking treatment on the paper pulp prepared in the step d, separating ink impurities on paper pulp fibers and removing impurities in the paper pulp to obtain deinked waste paper pulp with whiteness of 68% for later use;
f. uniformly mixing the straw unbleached pulp prepared in the step c, the waste paper pulp prepared in the step e and zeolite to form mixed slurry, wherein the mass mixing ratio of the components is as follows: 50 percent of straw unbleached pulp, 20 percent of waste paper pulp and 30 percent of zeolite, wherein the sum of the mass percentages of the components is 100 percent;
g. f, carrying out hot grinding dissociation on the mixed slurry prepared in the step f, wherein the beating degree of the ground slurry is 45 degrees SR, and the ground slurry is sent into a slurry pool to be used as paper making slurry;
h. preparing paper by a pulp papermaking machine for papermaking; and the paper is dried by adopting a net pattern surface pressing roller and a net pattern drying cylinder in the production and drying process, so that a matte net pattern surface is formed on the surface of the finished product paper.
EXAMPLE III
The preparation process of environment-friendly myopia-preventing paper adopts a mixture of waste paper and straws as a raw material, and comprises the following specific steps:
a. cutting the straws into pieces with the length of 1-2 cm, removing impurities by a grass washing machine, and then dehydrating;
b. placing the dehydrated flaky straws into a container, adding a swelling agent and a cooking agent into the container: the swelling agent is formed by combining sodium hydroxide accounting for 10 percent of the mass fraction of the straws and silicon compounds accounting for 0.3 percent of the mass fraction of the straws, the cooking agent is formed by combining sodium sulfite accounting for 4 percent of the mass fraction of the straws and anthraquinone accounting for 0.03 percent of the mass fraction of the straws, and water is added and mixed uniformly;
c. heating the container in the step b and cooking the straws, wherein the cooking temperature is 150 ℃, the cooking time is l.5h, then the temperature is kept at 160 ℃, and the straws are soaked for 1h, so that the flaky straws are softened, the impurities in the slurry are removed, and the straw unbleached pulp with the whiteness of 50 percent and the concentration of 20 percent is prepared for later use;
d. crushing waste paper into pieces of lmm-4 mm by a pulper, putting the pieces into a container, adding hot water with the temperature of 80 ℃ into the container, and uniformly mixing to prepare paper pulp with the concentration of 18%;
e. d, performing ionic liquid and enzyme treatment combined deinking treatment on the paper pulp prepared in the step d, separating ink impurities on paper pulp fibers and removing impurities in the paper pulp to obtain deinked waste paper pulp with whiteness of 75% for later use;
f. uniformly mixing the straw unbleached pulp prepared in the step c, the waste paper pulp prepared in the step e and titanium dioxide to form mixed slurry, wherein the mass mixing ratio of the components is as follows: 45 percent of straw unbleached pulp, 35 percent of waste paper pulp and 20 percent of titanium dioxide, wherein the sum of the mass percentages of the components is 100 percent;
g. f, carrying out hot grinding dissociation on the mixed slurry prepared in the step f, wherein the beating degree of the ground slurry is 10 degrees SR, and the ground slurry is sent into a slurry pool to be used as paper making slurry;
h. preparing paper by a pulp papermaking machine for papermaking; and the paper is dried by adopting a net pattern surface pressing roller and a net pattern drying cylinder in the production and drying process, so that a matte net pattern surface is formed on the surface of the finished product paper.
Example four
The preparation process of environment-friendly myopia-preventing paper adopts a mixture of waste paper and straws as a raw material, and comprises the following specific steps:
a. cutting the straws into pieces with the length of 1-2 cm, removing impurities by a grass washing machine, and then dehydrating;
b. placing the dehydrated flaky straws into a container, adding a swelling agent and a cooking agent into the container: the swelling agent is formed by combining sodium hydroxide accounting for 12 percent of the mass fraction of the straws and silicon compounds accounting for 0.4 percent of the mass fraction of the straws, the cooking agent is formed by combining sodium sulfite accounting for 5 percent of the mass fraction of the straws and anthraquinone accounting for 0.04 percent of the mass fraction of the straws, water is added, and the mixture is uniformly mixed;
c. b, heating the container in the step b, cooking the straws at 160 ℃ for l.2h, keeping the temperature at 170 ℃, and soaking for 1h to soften the flaky straws and remove impurities in the slurry to prepare straw unbleached pulp with the whiteness of 50% and the concentration of 20% for later use;
d. crushing waste paper into pieces of lmm-4 mm by a pulper, putting the pieces into a container, adding hot water with the temperature of 80 ℃ into the container, and uniformly mixing to prepare paper pulp with the concentration of 20%;
e. d, performing ionic liquid and enzyme treatment combined deinking treatment on the paper pulp prepared in the step d, separating ink impurities on paper pulp fibers and removing impurities in the paper pulp to obtain deinked waste paper pulp with the whiteness of 67% for later use;
f. uniformly mixing the straw unbleached pulp prepared in the step c, the waste paper pulp prepared in the step e, the mixture of porous calcium silicate and zeolite to form mixed slurry, wherein the mass mixing ratio of the components is as follows: 35 percent of straw unbleached pulp, 40 percent of waste paper pulp, 25 percent of mixture of porous calcium silicate and zeolite, wherein the sum of the mass fractions of the components is 100 percent;
g. f, carrying out hot grinding dissociation on the mixed slurry prepared in the step f, wherein the beating degree of the ground slurry is 45 degrees SR, and the ground slurry is sent into a slurry pool to be used as paper making slurry;
h. preparing paper by a pulp papermaking machine for papermaking; and the paper is dried by adopting a net pattern surface pressing roller and a net pattern drying cylinder in the production and drying process, so that a matte net pattern surface is formed on the surface of the finished product paper.
The average value of the performance indexes of the environment-friendly anti-myopia paper obtained by detecting the environment-friendly anti-myopia paper prepared in the first to fourth embodiments is shown in the following table. The table shows that the physical indexes and the strength indexes of the environment-friendly anti-myopia paper produced by the preparation process are both in the range of national standard first-grade products, wherein the air permeability of the paper enables the paper to generate the environment-friendly anti-myopia paper which can smoothly show handwriting through printing ink but does not excessively show through printing; the air permeability is better.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical scheme according to the technical idea proposed by the present invention falls within the protection scope of the present invention; the technology not related to the invention can be realized by the prior art.
Claims (8)
1. The preparation process of the environment-friendly myopia prevention paper adopts a mixture of waste paper and straw as a raw material and comprises the following specific steps:
a. cutting the straws into pieces with the length of 1-2 cm, removing impurities by a grass washing machine, and then dehydrating;
b. putting the dehydrated flaky straws into a container containing a solvent, and uniformly mixing, wherein the solvent contains a swelling agent, a cooking agent and water;
c. heating the container in the step b, cooking the straws and removing impurities in the slurry to prepare straw unbleached pulp with the whiteness of 40-55 percent and the concentration of 15-25 percent;
d. crushing waste paper into pieces of lmm-4 mm by a pulper, putting the pieces into a container, adding hot water into the container, and uniformly mixing to prepare paper pulp with the concentration of 15-20%;
e. d, deinking the paper pulp obtained in the step d, separating ink impurities on paper pulp fibers and removing impurities in the paper pulp to obtain deinked waste paper pulp with the whiteness of 65-75%;
f. uniformly mixing the straw unbleached pulp prepared in the step c, the waste paper pulp prepared in the step e and the porous filler to form mixed slurry, wherein the mass mixing ratio of the components is as follows: 20 to 50 percent of straw unbleached pulp, 20 to 50 percent of waste paper pulp and 20 to 30 percent of porous filler, wherein the sum of the mass percentages of the components is 100 percent;
g. f, carrying out hot grinding dissociation on the mixed slurry prepared in the step f, wherein the beating degree of the ground slurry is 35-45 DEG SR, and the ground slurry is sent into a slurry pool to be used as paper making slurry;
h. papermaking pulp is used in papermaking machines to make paper.
2. The preparation process of the environment-friendly myopia prevention paper according to claim 1, characterized in that: the swelling agent in the step b is formed by combining sodium hydroxide accounting for 5 to 15 mass percent of the straws and a silicon compound accounting for 0.2 to 0.5 mass percent of the straws; the cooking agent is formed by combining sodium sulfite accounting for 2 to 6 mass percent of the straws and anthraquinone accounting for 0.02 to 0.05 mass percent of the straws.
3. The preparation process of the environment-friendly myopia prevention paper according to claim 1, characterized in that: the cooking temperature in the step c is 100-180 ℃, the cooking time is lh-2 h, then the temperature is kept at 150-180 ℃, the soaking time is 0.5-1.5 h, the flaky straws are softened, and the straw unbleached pulp with the whiteness of 40-55% and the concentration of 15-25% is prepared.
4. The preparation process of the environment-friendly myopia prevention paper according to claim 1, characterized in that: the temperature of the hot water in the step d is 70-90 ℃.
5. The preparation process of the environment-friendly myopia prevention paper according to claim 1, characterized in that: and e, deinking treatment in the step e adopts ionic liquid and enzyme treatment combined deinking.
6. The preparation process of the environment-friendly myopia prevention paper according to claim 1, characterized in that: the porous filler in the step f has the characteristics of porosity and large specific surface area, the whiteness of the porous filler is not less than 80%, the average particle size range is 10-25 mu m, and the density is 1-2 g/cm3。
7. The preparation process of the environment-friendly myopia prevention paper according to claim 1 or 6, characterized in that: the porous filler in the step f is one or a mixture of more of porous calcium silicate, zeolite, titanium dioxide and diatomite.
8. The preparation process of the environment-friendly myopia prevention paper according to claim 1, characterized in that: and (h) drying the paper in the step h by adopting a net grain surface pressing roller and a net grain drying cylinder in the forming, pressing and drying processes, and leading the surface of the finished product paper to present a frosted matte net grain surface by utilizing mesh guidance.
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Application publication date: 20210601 |