CN111809428A - High-speed cutting method for softwood pulp - Google Patents
High-speed cutting method for softwood pulp Download PDFInfo
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- CN111809428A CN111809428A CN202010721743.3A CN202010721743A CN111809428A CN 111809428 A CN111809428 A CN 111809428A CN 202010721743 A CN202010721743 A CN 202010721743A CN 111809428 A CN111809428 A CN 111809428A
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- softwood pulp
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- high speed
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Classifications
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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
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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
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- 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
- D21C7/00—Digesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
Abstract
The invention provides a high-speed cutting method for softwood pulp. According to the technical scheme, firstly, cellulase and hemicellulase are utilized to carry out enzymolysis on wet softwood pulp, and in the latter half period of enzymolysis, cocamidopropyl betaine is utilized to increase the surface tension of materials and keep the enzymolysis rate; on the basis, the product after enzymolysis is cooked for 20min under the conditions of 3 atmospheric pressure and 134 ℃, and then is repeatedly frozen and thawed for 8 times, so that the toughness and the crosslinking property of the fiber are damaged; and then, the softwood pulp is subjected to blast drying for 8 hours in a blast dryer at the temperature of 180 ℃ and the wind speed of 7m/s, and then is treated by a double-shaft shredder, a hydrapulper and a refiner in sequence, and finally the cutting and homogenization treatment of the softwood pulp is realized. The invention can effectively cut off the softwood pulp, improves the fiber dispersibility, is convenient for subsequent papermaking, has higher toughness and tensile strength, and has outstanding technical advantages.
Description
Technical Field
The invention relates to the technical field of pulping and papermaking, in particular to a high-speed cutting method for softwood pulp.
Background
Since pulp fibers are strong and elastic, if the pulp is used for papermaking without any treatment, the pulp fibers are difficult to be uniformly distributed during formation on a wire, and the hardness of the paper to be produced is low, the pulp needs to be sufficiently cut and uniformly mixed before papermaking, and this process is called beating or beating. In addition, the pulp which is not pulped still contains unseparated fiber bundles which are stiff, too long, too thick and lack the necessary cutting and separation, and if the pulp is made of the fiber bundles, the obtained product is loose, porous, rough in surface and low in strength, and cannot meet the use requirements. The paper produced by the pulping paper pulp has compact and uniform tissue and higher strength.
In the beating process, the fibers are sheared, kneaded, carded and the like by a machine part, and meanwhile, the cell walls of the fibers are subjected to displacement, deformation, cracking and other phenomena to absorb water and swell to generate fine fibers, so that the paper pulp has softness and plasticity, the hydroxyl in the cellulose molecular chain is increased to be combined with hydrogen chains, and the binding force among the fibers is improved. According to the beating action, the method can be divided into sticky beating and free beating. The free beating is mainly cutting, and the concentration of paper pulp is lower. The beating machine of the method has sharper blades and dense pitch of the blades, and the fibers are easy to cut off during beating, so that the made paper has the characteristics of small density, bulkiness, opacity, small elasticity, easy adhesion of ink and the like. At present, conventional free pulping has a good effect when processing hardwood pulp; compared with hardwood pulp, softwood pulp has longer fibers and stronger toughness, and the conventional pulping method has generally unsatisfactory cutting effect.
Disclosure of Invention
The invention aims to provide a high-speed cutting method for softwood pulp aiming at the technical defects of the prior art, so as to solve the technical problem that the conventional pulping method has poor cutting effect on the softwood pulp in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a high speed chopping process for softwood pulp comprising the steps of:
1) mixing 200 parts by weight of softwood pulp with 300 parts by weight of water, uniformly mixing in a double cone mixer, draining, mixing cellulase to a final concentration of 520U/mL and hemicellulase to a final concentration of 260U/mL, adjusting the pH value to 5.8 by using HCl, keeping the pH value at 35 ℃ for 6 hours, adding 120 parts by weight of water and 20 parts by weight of cocamidopropyl betaine, and keeping the pH value for 4 hours;
2) centrifuging the product obtained in the step 2), taking a solid phase, dispersing the solid phase into 400 parts by weight of water, cooking for 20min under the conditions of 3 atmospheric pressures and 134 ℃, then recovering to normal pressure and naturally cooling to room temperature to obtain a cooked product; repeatedly freezing and thawing the cooked product for 8 times, and then recovering to normal temperature;
3) putting the product obtained in the step 3) into a forced air drying box, and carrying out forced air drying for 8 hours at the temperature of 180 ℃ and the wind speed of 7 m/s; taking out, treating with a double-shaft shredder, treating with a hydrapulper, and pulping with a pulping machine.
Preferably, in step 1), after adding the cocamidopropyl betaine, 220U/mL xylanase is added and then kept for 4 h.
Preferably, in step 1), the ultrasonic oscillation is continuously performed during the continuous keeping for 4 hours.
Preferably, in the step 2), the upper temperature limit of the freeze thawing process is 4 ℃, and the lower temperature limit is-5 ℃; the total duration of each freeze-thaw process does not exceed 5 min.
Preferably, in step 2), the solid phase is dispersed in 400 parts by weight of water, and this is carried out using a stirrer.
Preferably, in step 3), the rotation speed of the refiner is not lower than 3500 rpm.
Preferably, in the step 3), the water content of the material after 8 hours of air drying is not higher than 2%.
The invention provides a high-speed cutting method for softwood pulp. According to the technical scheme, firstly, cellulase and hemicellulase are utilized to carry out enzymolysis on wet softwood pulp, and in the latter half period of enzymolysis, cocamidopropyl betaine is utilized to increase the surface tension of materials and keep the enzymolysis rate; on the basis, the product after enzymolysis is cooked for 20min under the conditions of 3 atmospheric pressure and 134 ℃, and then is repeatedly frozen and thawed for 8 times, so that the toughness and the crosslinking property of the fiber are damaged; and then, the softwood pulp is subjected to blast drying for 8 hours in a blast dryer at the temperature of 180 ℃ and the wind speed of 7m/s, and then is treated by a double-shaft shredder, a hydrapulper and a refiner in sequence, and finally the cutting and homogenization treatment of the softwood pulp is realized. The invention can effectively cut off the softwood pulp, improves the fiber dispersibility, is convenient for subsequent papermaking, has higher toughness and tensile strength, and has outstanding technical advantages.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
A high speed chopping process for softwood pulp comprising the steps of:
1) mixing 200 parts by weight of softwood pulp with 300 parts by weight of water, uniformly mixing in a double cone mixer, draining, mixing cellulase to a final concentration of 520U/mL and hemicellulase to a final concentration of 260U/mL, adjusting the pH value to 5.8 by using HCl, keeping the pH value at 35 ℃ for 6 hours, adding 120 parts by weight of water and 20 parts by weight of cocamidopropyl betaine, and keeping the pH value for 4 hours;
2) centrifuging the product obtained in the step 2), taking a solid phase, dispersing the solid phase into 400 parts by weight of water, cooking for 20min under the conditions of 3 atmospheric pressures and 134 ℃, then recovering to normal pressure and naturally cooling to room temperature to obtain a cooked product; repeatedly freezing and thawing the cooked product for 8 times, and then recovering to normal temperature;
3) putting the product obtained in the step 3) into a forced air drying box, and carrying out forced air drying for 8 hours at the temperature of 180 ℃ and the wind speed of 7 m/s; taking out, treating with a double-shaft shredder, treating with a hydrapulper, and pulping with a pulping machine.
In step 1), after adding the cocamidopropyl betaine, 220U/mL xylanase is added and then kept for 4 hours. In the step 1), continuously carrying out ultrasonic oscillation in the process of continuously keeping for 4 hours. In the step 2), the upper temperature limit of the freeze thawing process is 4 ℃, and the lower temperature limit is-5 ℃; the total duration of each freeze-thaw process does not exceed 5 min. In step 2), the solid phase was dispersed in 400 parts by weight of water by using a stirrer. In the step 3), the rotating speed of the pulping machine is not lower than 3500 rpm. And in the step 3), the water content of the material after 8 hours of air drying is not higher than 2%.
Example 2
A high speed chopping process for softwood pulp comprising the steps of:
1) mixing 200 parts by weight of softwood pulp with 300 parts by weight of water, uniformly mixing in a double cone mixer, draining, mixing cellulase to a final concentration of 520U/mL and hemicellulase to a final concentration of 260U/mL, adjusting the pH value to 5.8 by using HCl, keeping the pH value at 35 ℃ for 6 hours, adding 120 parts by weight of water and 20 parts by weight of cocamidopropyl betaine, and keeping the pH value for 4 hours;
2) centrifuging the product obtained in the step 2), taking a solid phase, dispersing the solid phase into 400 parts by weight of water, cooking for 20min under the conditions of 3 atmospheric pressures and 134 ℃, then recovering to normal pressure and naturally cooling to room temperature to obtain a cooked product; repeatedly freezing and thawing the cooked product for 8 times, and then recovering to normal temperature;
3) putting the product obtained in the step 3) into a forced air drying box, and carrying out forced air drying for 8 hours at the temperature of 180 ℃ and the wind speed of 7 m/s; taking out, treating with a double-shaft shredder, treating with a hydrapulper, and pulping with a pulping machine.
In step 1), after adding the cocamidopropyl betaine, 220U/mL xylanase is added and then kept for 4 hours. In step 2), the solid phase was dispersed in 400 parts by weight of water by using a stirrer. In the step 3), the rotating speed of the pulping machine is not lower than 3500 rpm.
Example 3
A high speed chopping process for softwood pulp comprising the steps of:
1) mixing 200 parts by weight of softwood pulp with 300 parts by weight of water, uniformly mixing in a double cone mixer, draining, mixing cellulase to a final concentration of 520U/mL and hemicellulase to a final concentration of 260U/mL, adjusting the pH value to 5.8 by using HCl, keeping the pH value at 35 ℃ for 6 hours, adding 120 parts by weight of water and 20 parts by weight of cocamidopropyl betaine, and keeping the pH value for 4 hours;
2) centrifuging the product obtained in the step 2), taking a solid phase, dispersing the solid phase into 400 parts by weight of water, cooking for 20min under the conditions of 3 atmospheric pressures and 134 ℃, then recovering to normal pressure and naturally cooling to room temperature to obtain a cooked product; repeatedly freezing and thawing the cooked product for 8 times, and then recovering to normal temperature;
3) putting the product obtained in the step 3) into a forced air drying box, and carrying out forced air drying for 8 hours at the temperature of 180 ℃ and the wind speed of 7 m/s; taking out, treating with a double-shaft shredder, treating with a hydrapulper, and pulping with a pulping machine.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A high speed chopping process for softwood pulp characterized by the steps of:
1) mixing 200 parts by weight of softwood pulp with 300 parts by weight of water, uniformly mixing in a double cone mixer, draining, mixing cellulase to a final concentration of 520U/mL and hemicellulase to a final concentration of 260U/mL, adjusting the pH value to 5.8 by using HCl, keeping the pH value at 35 ℃ for 6 hours, adding 120 parts by weight of water and 20 parts by weight of cocamidopropyl betaine, and keeping the pH value for 4 hours;
2) centrifuging the product obtained in the step 2), taking a solid phase, dispersing the solid phase into 400 parts by weight of water, cooking for 20min under the conditions of 3 atmospheric pressures and 134 ℃, then recovering to normal pressure and naturally cooling to room temperature to obtain a cooked product; repeatedly freezing and thawing the cooked product for 8 times, and then recovering to normal temperature;
3) putting the product obtained in the step 3) into a forced air drying box, and carrying out forced air drying for 8 hours at the temperature of 180 ℃ and the wind speed of 7 m/s; taking out, treating with a double-shaft shredder, treating with a hydrapulper, and pulping with a pulping machine.
2. The high speed chopping method for softwood pulp according to claim 1, characterized in that in step 1), after the cocamidopropyl betaine is added, 220U/mL xylanase is added and then kept for 4 h.
3. The method for high-speed cutting of softwood pulp according to claim 1, wherein in step 1), the ultrasonic agitation is continued during the 4h continuous holding.
4. The high speed chopping method for softwood pulp according to claim 1, wherein in step 2), the upper temperature limit of the freeze-thaw process is 4 ℃ and the lower temperature limit is-5 ℃; the total duration of each freeze-thaw process does not exceed 5 min.
5. The high speed cutting method for softwood pulp according to claim 1, wherein in step 2) the solid phase is dispersed in 400 parts by weight of water by means of a blender.
6. A high speed chopping process for softwood pulp according to claim 1 characterised in that in step 3) the refiner is operated at a speed of not less than 3500 rpm.
7. The high speed chopping method for softwood pulp as recited in claim 1, wherein in step 3), the moisture content of the material after 8 hours of forced air drying is not higher than 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010721743.3A CN111809428A (en) | 2020-07-24 | 2020-07-24 | High-speed cutting method for softwood pulp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010721743.3A CN111809428A (en) | 2020-07-24 | 2020-07-24 | High-speed cutting method for softwood pulp |
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| CN111809428A true CN111809428A (en) | 2020-10-23 |
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| CN202010721743.3A Pending CN111809428A (en) | 2020-07-24 | 2020-07-24 | High-speed cutting method for softwood pulp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113184452A (en) * | 2021-02-25 | 2021-07-30 | 淄博圣泉纸业有限公司 | Reel wood pulp cutting and thick liquids conveying equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101210394A (en) * | 2006-12-29 | 2008-07-02 | 汪官久 | Technique for producing pure biological paper pulp |
| CN104452398A (en) * | 2014-10-27 | 2015-03-25 | 浙江科技学院 | Energy-saving enhanced defibrination method for composite pretreatment and production of viscous paper pulp |
| CN107304524A (en) * | 2016-04-19 | 2017-10-31 | 刘从荡 | A kind of process for preparing straw fiber of environment-friendly high-efficiency |
-
2020
- 2020-07-24 CN CN202010721743.3A patent/CN111809428A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101210394A (en) * | 2006-12-29 | 2008-07-02 | 汪官久 | Technique for producing pure biological paper pulp |
| CN104452398A (en) * | 2014-10-27 | 2015-03-25 | 浙江科技学院 | Energy-saving enhanced defibrination method for composite pretreatment and production of viscous paper pulp |
| CN107304524A (en) * | 2016-04-19 | 2017-10-31 | 刘从荡 | A kind of process for preparing straw fiber of environment-friendly high-efficiency |
Non-Patent Citations (1)
| Title |
|---|
| 刘明义（编著）: "《林产工业》", 30 June 1989, 海南人民出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113184452A (en) * | 2021-02-25 | 2021-07-30 | 淄博圣泉纸业有限公司 | Reel wood pulp cutting and thick liquids conveying equipment |
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Application publication date: 20201023 |
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