CN111979842A - Preparation process of low-gram super-strong cardboard paper - Google Patents
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- CN111979842A CN111979842A CN202010835815.7A CN202010835815A CN111979842A CN 111979842 A CN111979842 A CN 111979842A CN 202010835815 A CN202010835815 A CN 202010835815A CN 111979842 A CN111979842 A CN 111979842A
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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
- D21H27/10—Packing paper
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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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
- D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
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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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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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
-
- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- 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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
- D21H15/06—Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
-
- 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
- D21H17/005—Microorganisms or enzymes
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
-
- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
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- Life Sciences & Earth Sciences (AREA)
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- Wood Science & Technology (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a preparation process of low-gram super-strong cardboard paper. The method comprises the following steps: (1) pulping; (2) grading; (3) papermaking and forming; (4) squeezing and drying; (5) and (4) sizing. The preparation process is simple, part of the pulped pulp is bleached, the use of the bleached pulp can achieve the effect of adjusting the brightness of the paper surface and improve the strength of the finished paper, meanwhile, only part of the pulp needs to be bleached, the cost is reduced, and the burst index of the prepared cardboard paper is more than or equal to 4.0 kPa.m 2/g; the ring pressure index is more than or equal to 10.0 N.m/g; the folding endurance is more than or equal to 180 times. The ash content of the formed paper is 7 percent, the unit consumption of the waste paper is reduced by 2 percent, and the unit consumption of the waste paper is reduced to 1.07t/t paper. The COD concentration of the white water is reduced by 5 percent and is reduced to 3800 mg/L. The annual output is considerable and the economic benefit is remarkable.
Description
Technical Field
The invention relates to a preparation process of low-gram super-strong boxboard paper, and belongs to the technical field of papermaking.
Background
Waste paper is honored as the forest resource in the city, and in recent years because the shortage of papermaking raw materials day by day, the papermaking industry is serious to environmental pollution, and people pay more and more attention to the utilization of waste paper, and waste paper utilization ratio is constantly rising. The development, treatment and full utilization technology and continuous improvement of the level of recycled waste paper have important significance for reasonably using secondary fiber resources, relieving insufficient supply of papermaking raw materials, lightening environmental pollution, reducing energy consumption, reducing paper cost and protecting ecological balance. But when the waste paper is recycled, the content of fine fibers is high, the drainability is poor, the fiber strength, the fiber swelling performance and the fiber bonding force are reduced, and the fibers are flat, stiff and poor in flexibility. In addition, the impurity components in the waste paper are complex and difficult to remove, which brings more troubles to the production process and the product quality and limits the use of secondary fiber.
Meanwhile, the demand of people for low-basis weight and thin paper products is greatly increased, and the improvement of the paper strength is more and more important. How to make up the defects of the performance of the waste paper raw materials and the strength loss caused by high-consumption filler, meet the requirements of people on high-grade and low-quantitative paper, and improve the competitiveness of paper-making products in China in the international market is urgent. Therefore, a preparation process of the low-gram super-strong cardboard paper is necessary.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation process of low-gram super-strong boxboard paper.
The invention is realized by the following technical scheme:
a preparation process of low-gram super-strong boxboard paper comprises the following steps:
(1) pulping: mixing American waste paper and British waste paper according to a ratio of 70:30, feeding, bleaching one part of pulp after pulping, mixing with the other part of pulp, and adding biological enzyme into the mixed pulp under stirring;
(2) grading: collecting pulp according to long fiber pulp, medium fiber pulp and short fiber pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 30:10:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:50:40 to obtain core layer pulp, and mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:30:60 to obtain bottom layer pulp;
(3) papermaking and forming: respectively feeding the obtained surface layer pulp, core layer pulp and bottom layer pulp into a thermal dispersion system for dispersion, then carrying out online papermaking and forming to respectively obtain a surface layer paper web, a core layer paper web and a bottom layer paper web;
(4) pressing and drying: compounding the surface layer paper web, the core layer paper web and the bottom layer paper web, then squeezing, and drying by adopting a drying cylinder to obtain base paper;
(5) sizing: and spraying and gluing the surface of the base paper to obtain the final low-gram super-strong boxboard.
The preparation process of the low-gram super-strong boxboard comprises the following bleaching processes in the step (1): putting the slurry into a reaction kettle, adding sulfuric acid, fully mixing, introducing ozone into the reaction kettle under a stirring state for reacting for 50-65min, washing the slurry, adding chitosan, mixing, adding sodium hydroxide, adjusting the pH value to 6.5-7.5, introducing hydrogen peroxide into the reaction kettle, reacting for 50-65min, and washing to obtain bleached slurry.
The preparation process of the low-gram super-strong cardboard paper is characterized in that the concentration of the sulfuric acid is 98%, and the addition amount of the sulfuric acid is 3.2-5.6% of the weight of the oven dry pulp of the pulp.
The preparation process of the low-gram super-strong cardboard paper is characterized in that the concentration of hydrogen peroxide is 30%, and the adding amount of the hydrogen peroxide is 4.5-6.8% of the weight of the oven dry pulp of the pulp.
According to the preparation process of the low-gram super-strong cardboard paper, the addition amount of the chitosan is 1-1.6% of the weight of the oven dry pulp of the pulp.
According to the preparation process of the low-gram super-strong cardboard paper, the biological enzymes are cellulase and xylanase, and the addition amount of the biological enzymes is 0.4-0.5% of the weight of the oven dry pulp of the pulp.
According to the preparation process of the low-gram super-strong cardboard paper, the weight ratio of the cellulase to the xylanase is 1: 2-3.
The preparation process of the low-gram super-strong cardboard paper comprises the steps of (1) adding biological enzyme into pulp to react for 40-50min, and then adding amphoteric PAM to react for 50-60min, wherein the adding amount of the amphoteric PAM is 0.2-0.3% of the weight of the oven-dried pulp of the pulp.
According to the preparation process of the low-gram super-strong cardboard paper, the amphoteric PAM is polymerized by adopting acrylamide, diallyl dimethyl ammonium chloride and acrylic acid.
The invention achieves the following beneficial effects:
the preparation process is simple, part of the pulped pulp is bleached, the use of the bleached pulp can achieve the effect of adjusting the brightness of the paper surface and improve the strength of the finished paper, meanwhile, only part of the pulp needs to be bleached, the cost is reduced, and the burst index of the prepared cardboard paper is more than or equal to 4.0 kPa.m 2/g; the ring pressure index is more than or equal to 10.0 N.m/g; the folding endurance is more than or equal to 180 times. The ash content of the formed paper is 7 percent, the unit consumption of the waste paper is reduced by 2 percent, and the unit consumption of the waste paper is reduced to 1.07t/t paper. The COD concentration of the white water is reduced by 5 percent and is reduced to 3800 mg/L. The annual output is considerable and the economic benefit is remarkable.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
A preparation process of low-gram super-strong boxboard paper comprises the following steps:
(1) pulping: mixing American waste paper and British waste paper according to a ratio of 70:30, feeding, bleaching one part of pulp after pulping, mixing with the other part of pulp, and adding biological enzyme into the mixed pulp under stirring;
(2) grading: collecting pulp according to long fiber pulp, medium fiber pulp and short fiber pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 30:10:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:50:40 to obtain core layer pulp, and mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:30:60 to obtain bottom layer pulp;
(3) papermaking and forming: respectively feeding the obtained surface layer pulp, core layer pulp and bottom layer pulp into a thermal dispersion system for dispersion, then carrying out online papermaking and forming to respectively obtain a surface layer paper web, a core layer paper web and a bottom layer paper web;
(4) pressing and drying: compounding the surface layer paper web, the core layer paper web and the bottom layer paper web, then squeezing, and drying by adopting a drying cylinder to obtain base paper;
(5) sizing: and spraying and gluing the surface of the base paper to obtain the final low-gram super-strong boxboard.
Wherein the bleaching process in the step (1) comprises the following steps: and (2) putting the slurry into a reaction kettle, adding sulfuric acid, fully mixing, introducing ozone into the reaction kettle under a stirring state for reacting for 50min, washing the slurry, adding chitosan, mixing, adding sodium hydroxide, adjusting the pH value to 6.5, introducing hydrogen peroxide into the reaction kettle, reacting for 50min, and washing to obtain bleached slurry.
The concentration of the sulfuric acid is 98%, and the addition amount of the sulfuric acid is 3.2% of the weight of the oven-dried slurry of the slurry. The concentration of the hydrogen peroxide is 30 percent, and the adding amount of the hydrogen peroxide is 4.5 percent of the weight of the oven-dried slurry of the slurry. The addition amount of the chitosan is 1 percent of the weight of the oven-dried pulp of the pulp.
The biological enzymes are cellulase and xylanase, and the addition amount of the biological enzymes is 0.4 percent of the weight of the oven-dried pulp of the pulp. The weight ratio of the cellulase to the xylanase is 1: 2.
And (2) adding biological enzyme into the slurry obtained in the step (1) for reacting for 50min, and then adding amphoteric PAM for reacting for 50min, wherein the adding amount of the amphoteric PAM is 0.3% of the oven-dried slurry weight of the slurry. The amphoteric PAM is polymerized by adopting acrylamide, diallyl dimethyl ammonium chloride and acrylic acid.
The bleaching process of the embodiment is simple in flow and good in bleaching effect; in the embodiment, cellulase and xylan alcohol are mixed to be used as biological enzyme, so that the surface of the fiber is activated and relaxed to a certain degree, the water absorption swelling and the fiber thinning degree of the fiber are promoted, and the paper strength is improved.
Example 2
A preparation process of low-gram super-strong boxboard paper comprises the following steps:
(1) pulping: mixing American waste paper and British waste paper according to a ratio of 70:30, feeding, bleaching one part of pulp after pulping, mixing with the other part of pulp, and adding biological enzyme into the mixed pulp under stirring;
(2) grading: collecting pulp according to long fiber pulp, medium fiber pulp and short fiber pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 30:10:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:50:40 to obtain core layer pulp, and mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:30:60 to obtain bottom layer pulp;
(3) papermaking and forming: respectively feeding the obtained surface layer pulp, core layer pulp and bottom layer pulp into a thermal dispersion system for dispersion, then carrying out online papermaking and forming to respectively obtain a surface layer paper web, a core layer paper web and a bottom layer paper web;
(4) pressing and drying: compounding the surface layer paper web, the core layer paper web and the bottom layer paper web, then squeezing, and drying by adopting a drying cylinder to obtain base paper;
(5) sizing: and spraying and gluing the surface of the base paper to obtain the final low-gram super-strong boxboard.
Wherein the bleaching process in the step (1) comprises the following steps: putting the slurry into a reaction kettle, adding sulfuric acid, fully mixing, introducing ozone into the reaction kettle under a stirring state for reacting for 65min, adding chitosan after the slurry is washed, mixing, adding sodium hydroxide to adjust the pH value to 7.5, introducing hydrogen peroxide into the reaction kettle, reacting for 65min, and washing to obtain bleached slurry.
The concentration of the sulfuric acid is 98%, and the addition amount of the sulfuric acid is 5.6% of the weight of the oven-dried slurry of the slurry. The concentration of the hydrogen peroxide is 30 percent, and the adding amount of the hydrogen peroxide is 6.8 percent of the weight of the oven-dried slurry of the slurry. The addition amount of the chitosan is 1.6 percent of the weight of the oven-dried pulp of the pulp.
The biological enzymes are cellulase and xylanase, and the addition amount of the biological enzymes is 0.5 percent of the weight of the oven-dried pulp of the pulp. The weight ratio of the cellulase to the xylanase is 1: 3.
And (2) adding biological enzyme into the slurry obtained in the step (1) for reacting for 40min, and then adding amphoteric PAM for reacting for 60min, wherein the adding amount of the amphoteric PAM is 0.2% of the weight of the oven-dried slurry of the slurry. The amphoteric PAM is polymerized by adopting acrylamide, diallyl dimethyl ammonium chloride and acrylic acid.
Comparative example 1
A preparation process of low-gram super-strong boxboard paper comprises the following steps:
(1) pulping: mixing American waste paper and British waste paper according to a ratio of 70:30, feeding, pulping, and adding biological enzyme under stirring;
(2) grading: collecting pulp according to long fiber pulp, medium fiber pulp and short fiber pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 30:10:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:50:40 to obtain core layer pulp, and mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:30:60 to obtain bottom layer pulp;
(3) papermaking and forming: respectively feeding the obtained surface layer pulp, core layer pulp and bottom layer pulp into a thermal dispersion system for dispersion, then carrying out online papermaking and forming to respectively obtain a surface layer paper web, a core layer paper web and a bottom layer paper web;
(4) pressing and drying: compounding the surface layer paper web, the core layer paper web and the bottom layer paper web, then squeezing, and drying by adopting a drying cylinder to obtain base paper;
(5) sizing: and spraying and gluing the surface of the base paper to obtain the final low-gram super-strong boxboard.
The rest is the same as in example 2.
Comparative example 2
A preparation process of low-gram super-strong boxboard paper comprises the following steps:
(1) pulping: mixing American waste paper and British waste paper according to a ratio of 70:30, feeding, bleaching one part of pulp after pulping, and then mixing with the other part of pulp;
(2) grading: collecting pulp according to long fiber pulp, medium fiber pulp and short fiber pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 30:10:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:50:40 to obtain core layer pulp, and mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:30:60 to obtain bottom layer pulp;
(3) papermaking and forming: respectively feeding the obtained surface layer pulp, core layer pulp and bottom layer pulp into a thermal dispersion system for dispersion, then carrying out online papermaking and forming to respectively obtain a surface layer paper web, a core layer paper web and a bottom layer paper web;
(4) pressing and drying: compounding the surface layer paper web, the core layer paper web and the bottom layer paper web, then squeezing, and drying by adopting a drying cylinder to obtain base paper;
(5) sizing: and spraying and gluing the surface of the base paper to obtain the final low-gram super-strong boxboard.
The rest is the same as in example 2.
Comparative example 3
A preparation process of low-gram super-strong boxboard paper comprises the following steps:
(1) pulping: mixing American waste paper and British waste paper according to a ratio of 70:30, feeding, bleaching one part of pulp after pulping, mixing with the other part of pulp, and adding biological enzyme into the mixed pulp under stirring;
(2) grading: collecting pulp according to long fiber pulp, medium fiber pulp and short fiber pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 30:10:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:50:40 to obtain core layer pulp, and mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:30:60 to obtain bottom layer pulp;
(3) papermaking and forming: respectively feeding the obtained surface layer pulp, core layer pulp and bottom layer pulp into a thermal dispersion system for dispersion, then carrying out online papermaking and forming to respectively obtain a surface layer paper web, a core layer paper web and a bottom layer paper web;
(4) pressing and drying: compounding the surface layer paper web, the core layer paper web and the bottom layer paper web, then squeezing, and drying by adopting a drying cylinder to obtain base paper;
(5) sizing: and spraying and gluing the surface of the base paper to obtain the final low-gram super-strong boxboard.
Wherein the bleaching process in the step (1) comprises the following steps: putting the slurry into a reaction kettle, adding sulfuric acid, fully mixing, introducing ozone into the reaction kettle under a stirring state for reacting for 65min, adding chitosan after the slurry is washed, mixing, adding sodium hydroxide to adjust the pH value to 7.5, introducing hydrogen peroxide into the reaction kettle, reacting for 65min, and washing to obtain bleached slurry.
The concentration of the sulfuric acid is 98%, and the addition amount of the sulfuric acid is 5.6% of the weight of the oven-dried slurry of the slurry. The concentration of the hydrogen peroxide is 30 percent, and the adding amount of the hydrogen peroxide is 6.8 percent of the weight of the oven-dried slurry of the slurry. The addition amount of the chitosan is 1.6 percent of the weight of the oven-dried pulp of the pulp.
The biological enzymes are cellulase and xylanase, and the addition amount of the biological enzymes is 0.5 percent of the weight of the oven-dried pulp of the pulp. The weight ratio of the cellulase to the xylanase is 1: 3.
The rest is the same as in example 2.
The paper prepared in each example and comparative example was subjected to performance testing, and the specific results are shown in the following table:
compared with the comparative example 1, in the example 2, a part of pulp is bleached after pulping; because the high-strength OCC waste paper is adopted for papermaking, the color of the finished paper is dark, and the use of the bleached wood pulp can achieve the effect of regulating the brightness of the paper surface and simultaneously improve the strength of the finished paper; compared with the comparative example 2, the pulp of the example 2 is added with the biological enzyme, the biological enzyme has the removal effect on the fine fibers on the surface of the fibers, the flocculation effect on the fine fiber components and the hydrolysis effect on the fine fibers, so that the long fiber content in the waste paper pulp is increased, the freeness of the pulp also tends to rise, and the fibers have super-strong drainage performance; meanwhile, the biological enzyme is a biological product, has degradability and is beneficial to protecting the ecological environment; compared with the comparative example 3, the slurry of the example 2 added with the amphoteric PAM can not cause the fiber to be excessively flocculated to cause adverse effect on the paper formation uniformity, and simultaneously not only can effectively deal with the change of the papermaking system conditions, but also can improve the strength of the low-basis weight paper.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A preparation process of low-gram super-strong boxboard paper is characterized by comprising the following steps:
(1) pulping: mixing American waste paper and British waste paper according to a ratio of 70:30, feeding, bleaching one part of pulp after pulping, mixing with the other part of pulp, and adding biological enzyme into the mixed pulp under stirring;
(2) grading: collecting pulp according to long fiber pulp, medium fiber pulp and short fiber pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 30:10:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:50:40 to obtain core layer pulp, and mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:30:60 to obtain bottom layer pulp;
(3) papermaking and forming: respectively feeding the obtained surface layer pulp, core layer pulp and bottom layer pulp into a thermal dispersion system for dispersion, then carrying out online papermaking and forming to respectively obtain a surface layer paper web, a core layer paper web and a bottom layer paper web;
(4) pressing and drying: compounding the surface layer paper web, the core layer paper web and the bottom layer paper web, then squeezing, and drying by adopting a drying cylinder to obtain base paper;
(5) sizing: and spraying and gluing the surface of the base paper to obtain the final low-gram super-strong boxboard.
2. The process for preparing the low-gram super-strong boxboard as claimed in claim 1, wherein the bleaching process in the step (1) is as follows: putting the slurry into a reaction kettle, adding sulfuric acid, fully mixing, introducing ozone into the reaction kettle under a stirring state for reacting for 50-65min, washing the slurry, adding chitosan, mixing, adding sodium hydroxide, adjusting the pH value to 6.5-7.5, introducing hydrogen peroxide into the reaction kettle, reacting for 50-65min, and washing to obtain bleached slurry.
3. The process of claim 2, wherein the concentration of the sulfuric acid is 98%, and the amount of the sulfuric acid added is 3.2-5.6% of the oven dry weight of the pulp.
4. The process for preparing the low-gram super-strong cardboard paper as claimed in claim 2, wherein the concentration of the hydrogen peroxide is 30 percent, and the adding amount of the hydrogen peroxide is 4.5 to 6.8 percent of the weight of the oven dry pulp of the pulp.
5. The process of claim 2, wherein the amount of chitosan added is 1-1.6% of the oven dry weight of the pulp.
6. The process of claim 1, wherein the biological enzymes are cellulase and xylanase, and the addition amount of the biological enzymes is 0.4-0.5% of the oven dry pulp weight of the pulp.
7. The process for preparing super-strong boxboard paper with low gram as claimed in claim 6, wherein the weight ratio of the cellulose to the xylanase is 1: 2-3.
8. The process for preparing the low-gram super-strong cardboard paper as claimed in claim 1, wherein the amphoteric PAM is added to the pulp in the step (1) for reaction for 50-60min after the bio-enzyme is added to the pulp for reaction for 40-50min, and the addition amount of the amphoteric PAM is 0.2-0.3% of the weight of the oven-dried pulp of the pulp.
9. The process of claim 8, wherein the amphoteric PAM is polymerized from acrylamide, diallyldimethylammonium chloride, and acrylic acid.
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| CN202010835815.7A CN111979842A (en) | 2020-08-19 | 2020-08-19 | Preparation process of low-gram super-strong cardboard paper |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788777A (en) * | 2009-01-28 | 2010-07-28 | 富士施乐株式会社 | Image formation apparatus and printed item |
| CN105780564A (en) * | 2016-03-29 | 2016-07-20 | 山东贵和显星纸业有限公司 | Technology for producing high-strength cardboard paper from waste carton boxes |
| CN106894268A (en) * | 2017-01-04 | 2017-06-27 | 安徽山鹰纸业股份有限公司 | A kind of high-strength cow boxboard and preparation method thereof |
| CN107642003A (en) * | 2017-09-04 | 2018-01-30 | 江苏理文造纸有限公司 | A kind of manufacture method of novel environment friendly kraft paperboard |
| CN108130783A (en) * | 2017-12-06 | 2018-06-08 | 杭州春胜纸业有限公司 | A kind of synthesis pulping technique for assigning the high folding strength of coated white paperboard |
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2020
- 2020-08-19 CN CN202010835815.7A patent/CN111979842A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788777A (en) * | 2009-01-28 | 2010-07-28 | 富士施乐株式会社 | Image formation apparatus and printed item |
| CN105780564A (en) * | 2016-03-29 | 2016-07-20 | 山东贵和显星纸业有限公司 | Technology for producing high-strength cardboard paper from waste carton boxes |
| CN106894268A (en) * | 2017-01-04 | 2017-06-27 | 安徽山鹰纸业股份有限公司 | A kind of high-strength cow boxboard and preparation method thereof |
| CN107642003A (en) * | 2017-09-04 | 2018-01-30 | 江苏理文造纸有限公司 | A kind of manufacture method of novel environment friendly kraft paperboard |
| CN108130783A (en) * | 2017-12-06 | 2018-06-08 | 杭州春胜纸业有限公司 | A kind of synthesis pulping technique for assigning the high folding strength of coated white paperboard |
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Application publication date: 20201124 |