CN111979810A - Process for preparing cardboard paper by using wood chip fibers - Google Patents
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- CN111979810A CN111979810A CN202010835746.XA CN202010835746A CN111979810A CN 111979810 A CN111979810 A CN 111979810A CN 202010835746 A CN202010835746 A CN 202010835746A CN 111979810 A CN111979810 A CN 111979810A
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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
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
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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
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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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
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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
Abstract
The invention discloses a process for preparing boxboard paper by using wood chip fibers. The method comprises the following steps: (1) wood chip pretreatment; (2) waste paper treatment; (3) grading; (4) papermaking and forming; (5) squeezing and drying; (6) and (4) sizing. The preparation process of the invention adopts the wood chips as the raw material for making the cardboard paper, can reduce the use of waste paper raw materials, solves the problem of shortage of raw materials, and simultaneously, the cardboard paper prepared by the preparation process has good quality.
Description
Technical Field
The invention relates to a process for preparing boxboard paper by using wood chip fibers, and belongs to the technical field of papermaking.
Background
The import of external waste materials is limited, so that the domestic waste materials are tense, and the import and recycling cost of waste paper gradually rises along with the gradual increase of the importance of the society on environmental protection. To meet the challenge, paper making companies are seeking new materials to replace waste paper materials.
Sawdust fiber, also called wood fiber raw material, has a great price advantage and belongs to the category of leftover waste, and thus, the sawdust fiber is paid attention to paper making research and development personnel. At present, the use research of the wood chip fiber is less, the wood chip fiber is only limited to direct application of the wood chip fiber, and the use effect is poor. Therefore, a process for preparing the cardboard paper by using the wood chip fiber is necessary.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a process for preparing boxboard by using wood chip fibers.
The invention is realized by the following technical scheme:
a process for preparing cardboard paper by using wood chip fibers comprises the following steps:
(1) wood chip pretreatment: placing sawdust in water, slowly heating to 60-70 deg.C, adding sulfuric acid, and stirring for 40-50 min; then adding sodium hydroxide to adjust the pH value to 6-7, controlling the temperature to 40-50 ℃, adding cellulase, and stirring for reaction for 50-70 min; filtering to obtain a first slurry;
(2) waste paper treatment: pulping the waste paper to obtain a second pulp, mixing the first pulp with the second pulp, adding cellulase and xylanase, reacting for 50-70min, and filtering to obtain a mixed pulp;
(3) 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 20:30:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:40:50 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 10:35:55 to obtain bottom layer pulp;
(4) 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;
(5) 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;
(6) sizing: and spraying and gluing the surface of the base paper to obtain the final boxboard.
The process for preparing the cardboard paper by using the wood chip fibers comprises the steps of (1) placing first slurry in a reaction kettle, adding chitosan, then adding hydrogen peroxide into the reaction kettle, fully reacting, and washing to obtain bleached first slurry.
The process for preparing the cardboard paper by using the wood chip fibers is characterized in that the concentration of hydrogen peroxide is 28-32%, the adding amount of the hydrogen peroxide is 4.5-6.8% of the weight of the pulp oven-dry pulp, and the adding amount of the chitosan is 1-1.6% of the weight of the pulp oven-dry pulp.
According to the process for preparing the cardboard paper by using the wood chip fibers, the cellulase added in the step (1) accounts for 0.4-0.5% of the weight of the oven dry pulp of the pulp.
According to the process for preparing the cardboard paper by using the wood chip fibers, the weight ratio of the cellulase to the xylanase added in the step (2) is 2:3, and the total addition amount of the cellulase to the xylanase is 0.4-0.5% of the weight of the oven dry pulp of the pulp.
In the step (5), interlayer bonding glue is added when the surface layer paper web, the core layer paper web and the bottom layer paper web are compounded, and the interlayer bonding glue comprises the following raw materials in parts by weight: 50-60 parts of starch aqueous solution, 2-6 parts of sodium carboxymethylcellulose and 10-15 parts of polyacrylamide.
The process for preparing the cardboard paper by using the wood chip fibers comprises the following steps of: mixing starch and water according to the weight ratio of 1:3-4, heating to 60-80 ℃, stirring for 20-30min, slowly adding sodium carboxymethylcellulose and polyacrylamide under the stirring condition, and fully mixing to obtain the interlayer bonding adhesive.
According to the process for preparing the cardboard paper by using the wood chip fibers, the weight ratio of the first slurry to the second slurry is 1: 5.
The invention achieves the following beneficial effects:
the preparation process of the invention adopts the wood chips as the raw material for making the cardboard paper, can reduce the use of waste paper raw materials, solves the problem of shortage of raw materials, and simultaneously, the cardboard paper prepared by the preparation process has good quality.
The quality index of the finished paper reaches the index requirement of B series in the enterprise standard Q/320581GEV001-2019 cardboard paper, and the tightness is more than or equal to 0.70g/cm3The burst index is not less than 1.80 kPa.m2G, ring pressure index is more than or equal to 4.00 N.m/g, and water absorption (normal/reverse) is less than or equal to 60/80g/m2The smoothness is more than or equal to 7.0s, and the delivery moisture is 8.0 +/-2.0%.
The usage amount of the waste paper is reduced by 5 percent, the unit consumption of the waste paper is reduced to below 1.10, the cost of the comprehensive chemicals is increased, the cost per ton of paper is reduced by about 15-20 yuan, and the annual cost is reduced by about 450 ten thousand yuan; the comprehensive energy consumption of a unit product is less than or equal to 60 kgce/Adt.
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 process for preparing cardboard paper by using wood chip fibers comprises the following steps:
(1) wood chip pretreatment: placing sawdust in water, slowly heating to 60-70 deg.C, adding sulfuric acid, and stirring for 40 min; then adding sodium hydroxide to adjust the pH value to 6-7, controlling the temperature to 40-50 ℃, adding cellulase, and stirring for reaction for 50 min; filtering to obtain a first slurry; the addition amount of the cellulase is 0.4 percent of the weight of the oven-dried pulp of the pulp; placing the first slurry in a reaction kettle, adding chitosan, then adding hydrogen peroxide into the reaction kettle, fully reacting, and washing to obtain bleached first slurry; the concentration of the hydrogen peroxide is 28-32%, the adding amount of the hydrogen peroxide is 4.5% of the weight of the oven-dried slurry of the slurry, and the adding amount of the chitosan is 1% of the weight of the oven-dried slurry of the slurry;
(2) waste paper treatment: pulping the waste paper to obtain a second pulp, mixing the first pulp and the second pulp according to the weight-to-weight ratio of 1:5, adding cellulase and xylanase, fully reacting for 50min, and filtering to obtain a mixed pulp; the weight ratio of the added cellulase to the added xylanase is 2:3, and the total addition amount of the cellulase to the xylanase is 0.4 percent of the weight of the oven-dried pulp of the pulp;
(3) 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 20:30:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:40:50 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 10:35:55 to obtain bottom layer pulp;
(4) 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;
(5) 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; adding interlayer bonding glue when the surface layer paper web, the core layer paper web and the bottom layer paper web are compounded, wherein the interlayer bonding glue comprises the following raw materials in parts by weight: 50 parts of starch aqueous solution, 6 parts of sodium carboxymethyl cellulose and 10 parts of polyacrylamide;
(6) sizing: and spraying and gluing the surface of the base paper to obtain the final boxboard.
The interlayer bonding glue is obtained by the following steps: mixing starch and water according to the weight ratio of 1:3, heating to 60-80 ℃, stirring for 20min, slowly adding sodium carboxymethylcellulose and polyacrylamide under the stirring condition, and fully mixing to obtain the interlayer bonding adhesive.
Example 2
A process for preparing cardboard paper by using wood chip fibers comprises the following steps:
(1) wood chip pretreatment: placing sawdust in water, slowly heating to 60-70 deg.C, adding sulfuric acid, and stirring for 50 min; then adding sodium hydroxide to adjust the pH value to 6-7, controlling the temperature to 40-50 ℃, adding cellulase, and stirring to react for 70 min; filtering to obtain a first slurry; the addition amount of the cellulase is-0.5 percent of the weight of the oven-dried pulp of the pulp; placing the first slurry in a reaction kettle, adding chitosan, then adding hydrogen peroxide into the reaction kettle, fully reacting, and washing to obtain bleached first slurry; the concentration of the hydrogen peroxide is 32%, the adding amount of the hydrogen peroxide is 6.8% of the weight of the oven-dried slurry of the slurry, and the adding amount of the chitosan is 1.6% of the weight of the oven-dried slurry of the slurry;
(2) waste paper treatment: pulping the waste paper to obtain a second pulp, mixing the first pulp and the second pulp according to the weight-to-weight ratio of 1:5, adding cellulase and xylanase, fully reacting for 70min, and filtering to obtain a mixed pulp; the weight ratio of the added cellulase to the added xylanase is 2:3, and the total addition amount of the cellulase to the xylanase is 0.5 percent of the weight of the oven-dried pulp of the pulp;
(3) 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 20:30:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:40:50 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 10:35:55 to obtain bottom layer pulp;
(4) 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;
(5) 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; adding interlayer bonding glue when the surface layer paper web, the core layer paper web and the bottom layer paper web are compounded, wherein the interlayer bonding glue comprises the following raw materials in parts by weight: 60 parts of starch aqueous solution, 6 parts of sodium carboxymethyl cellulose and 15 parts of polyacrylamide;
(6) sizing: and spraying and gluing the surface of the base paper to obtain the final boxboard.
The interlayer bonding glue is obtained by the following steps: mixing starch and water according to the weight ratio of 1:3-4, heating to 60-80 ℃, stirring for 30min, slowly adding sodium carboxymethylcellulose and polyacrylamide under the stirring condition, and fully mixing to obtain the interlayer bonding adhesive.
Example 3
A process for preparing cardboard paper by using wood chip fibers comprises the following steps:
(1) wood chip pretreatment: placing sawdust in water, slowly heating to 60-70 deg.C, adding sulfuric acid, and stirring for 40-50 min; then adding sodium hydroxide to adjust the pH value to 6-7, controlling the temperature to 40-50 ℃, adding cellulase, and stirring for reaction for 50-70 min; filtering to obtain a first slurry; the addition amount of the cellulase is 0.4 to 0.5 percent of the weight of the oven-dried pulp of the pulp; placing the first slurry in a reaction kettle, adding chitosan, then adding hydrogen peroxide into the reaction kettle, fully reacting, and washing to obtain bleached first slurry; the concentration of the hydrogen peroxide is 28-32%, the adding amount of the hydrogen peroxide is 4.5-6.8% of the weight of the oven-dried pulp of the pulp, and the adding amount of the chitosan is 1-1.6% of the weight of the oven-dried pulp of the pulp;
(2) waste paper treatment: pulping the waste paper to obtain a second pulp, mixing the first pulp and the second pulp according to the weight-to-weight ratio of 1:5, adding cellulase and xylanase, reacting for 50-70min, and filtering to obtain a mixed pulp; the weight ratio of the added cellulase to the added xylanase is 2:3, and the total addition amount of the cellulase to the xylanase is 0.4-0.5 percent of the weight of the oven dry pulp of the pulp;
(3) 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 20:30:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:40:50 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 10:35:55 to obtain bottom layer pulp;
(4) 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;
(5) 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; adding interlayer bonding glue when the surface layer paper web, the core layer paper web and the bottom layer paper web are compounded, wherein the interlayer bonding glue comprises the following raw materials in parts by weight: 50-60 parts of starch aqueous solution, 2-6 parts of sodium carboxymethylcellulose and 10-15 parts of polyacrylamide;
(6) sizing: and spraying and gluing the surface of the base paper to obtain the final boxboard.
The interlayer bonding glue is obtained by the following steps: mixing starch and water according to the weight ratio of 1:3-4, heating to 60-80 ℃, stirring for 20-30min, slowly adding sodium carboxymethylcellulose and polyacrylamide under the stirring condition, and fully mixing to obtain the interlayer bonding adhesive.
Comparative example 1
A process for making boxboard comprising the steps of:
(1) waste paper treatment: pulping the waste paper to obtain a second pulp, adding cellulase and xylanase, reacting for 50-70min, and filtering to obtain a mixed pulp; the weight ratio of the added cellulase to the added xylanase is 2:3, and the total addition amount of the cellulase to the xylanase is 0.4-0.5 percent of the weight of the oven dry pulp of the pulp;
(3) 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 20:30:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:40:50 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 10:35:55 to obtain bottom layer pulp;
(4) 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;
(5) 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; adding interlayer bonding glue when the surface layer paper web, the core layer paper web and the bottom layer paper web are compounded, wherein the interlayer bonding glue comprises the following raw materials in parts by weight: 50-60 parts of starch aqueous solution, 2-6 parts of sodium carboxymethylcellulose and 10-15 parts of polyacrylamide;
(6) sizing: and spraying and gluing the surface of the base paper to obtain the final boxboard.
The interlayer bonding glue is obtained by the following steps: mixing starch and water according to the weight ratio of 1:3-4, heating to 60-80 ℃, stirring for 20-30min, slowly adding sodium carboxymethylcellulose and polyacrylamide under the stirring condition, and fully mixing to obtain the interlayer bonding adhesive.
The rest is the same as in example 3.
The paper prepared in each example and comparative example was subjected to performance testing, and the specific results are shown in the following table:
| test items | Example 1 | Example 2 | Example 3 | Comparative example 1 |
| Burst index kPa m2/g | 1.8 | 1.8 | 1.8 | 1.8 |
| Tightness g/cm3 | 0.7 | 0.8 | 0.8 | 0.7 |
| Water absorption (normal/reverse) g/m2 | 60/80 | 60/80 | 60/80 | 60/80 |
| Ring pressure index N.m/g | 4 | 4 | 4 | 4 |
Compared with the comparative example 1, the wood chip fiber is added in the example 3, the using amount of waste paper is reduced, and meanwhile, the finished paper can meet the index requirements of the B series in the enterprise standard Q/320581GEV001-2019 cardboard 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 (8)
1. A process for preparing cardboard paper by using wood chip fibers is characterized by comprising the following steps:
(1) wood chip pretreatment: placing sawdust in water, slowly heating to 60-70 deg.C, adding sulfuric acid, and stirring for 40-50 min; then adding sodium hydroxide to adjust the pH value to 6-7, controlling the temperature to 40-50 ℃, adding cellulase, and stirring for reaction for 50-70 min; filtering to obtain a first slurry;
(2) waste paper treatment: pulping the waste paper to obtain a second pulp, mixing the first pulp with the second pulp, adding cellulase and xylanase, reacting for 50-70min, and filtering to obtain a mixed pulp;
(3) 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 20:30:60 to obtain surface layer pulp, mixing the short fiber pulp, the medium fiber pulp and the long fiber pulp according to the proportion of 10:40:50 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 10:35:55 to obtain bottom layer pulp;
(4) 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;
(5) 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;
(6) sizing: and spraying and gluing the surface of the base paper to obtain the final boxboard.
2. The process for preparing boxboard paper by using wood chip fibers as claimed in claim 1, wherein in the step (1), the first pulp is placed in a reaction kettle, chitosan is added, then hydrogen peroxide is added into the reaction kettle, the mixture is fully reacted, and the bleached first pulp is obtained after washing.
3. The process for preparing the cardboard paper by using the wood chip fibers as claimed in claim 2, wherein the concentration of the hydrogen peroxide is 28-32%, the adding amount of the hydrogen peroxide is 4.5-6.8% of the weight of the oven-dried pulp of the pulp, and the adding amount of the chitosan is 1-1.6% of the weight of the oven-dried pulp of the pulp.
4. The process for preparing boxboard from wood chip fiber as claimed in claim 1, wherein the cellulase added in step (1) is 0.4-0.5% of oven dried pulp.
5. The process for preparing boxboard from wood chip fiber as claimed in claim 1, wherein the weight ratio of cellulase to xylanase added in step (2) is 2:3, and the total addition amount is 0.4-0.5% of the oven dry pulp weight of the pulp.
6. The process for preparing the boxboard by using the wood chip fiber as claimed in claim 1, wherein in the step (5), an interlayer bonding adhesive is added when the surface layer paper web, the core layer paper web and the bottom layer paper web are compounded, and the interlayer bonding adhesive comprises the following raw materials in parts by weight: 50-60 parts of starch aqueous solution, 2-6 parts of sodium carboxymethylcellulose and 10-15 parts of polyacrylamide.
7. The process for preparing boxboard from wood chip fiber as claimed in claim 6, wherein the interlayer bonding glue is obtained by the following steps: mixing starch and water according to the weight ratio of 1:3-4, heating to 60-80 ℃, stirring for 20-30min, slowly adding sodium carboxymethylcellulose and polyacrylamide under the stirring condition, and fully mixing to obtain the interlayer bonding adhesive.
8. The process of claim 1, wherein the first and second slurries are present in a weight ratio of 1: 5.
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|---|---|---|---|---|
| CN112663374A (en) * | 2020-12-17 | 2021-04-16 | 江苏理文造纸有限公司 | Treatment process of wood chip fiber |
| CN112663374B (en) * | 2020-12-17 | 2023-05-12 | 江苏理文造纸有限公司 | Treatment process of wood chip fibers |
| CN113699816A (en) * | 2021-07-30 | 2021-11-26 | 江苏理文造纸有限公司 | Wood chip fiber pretreatment process for cardboard paper |
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