CN103526629A - Pulping process of waste paper with high wet strength - Google Patents
Pulping process of waste paper with high wet strength Download PDFInfo
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- CN103526629A CN103526629A CN201310504684.4A CN201310504684A CN103526629A CN 103526629 A CN103526629 A CN 103526629A CN 201310504684 A CN201310504684 A CN 201310504684A CN 103526629 A CN103526629 A CN 103526629A
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Abstract
The invention discloses a pulping process of waste paper with high wet strength. The pulp process comprises the following steps of (1) treating the waste paper with high wet strength into paper 8-10cm multiplied by 2-3cm, and treating with ClO2; (2) carrying out conventional defibering on the paper treated by using the ClO2 by a hydraulic pulper; (3) carrying out second-section ClO2 treatment on defibered pulp; (4) carrying out conventional defibering on the pulp treated by the second-section ClO2 through a high-frequency defibering machine; (5) washing the defibered pulp by a vacuum pulp washer; and (6) screening the washed pulp by a pressure screen and obtaining waste paper pulp with good fiber dispersion. The pulping process disclosed by the invention has the advantages that the pulping performance of the waste paper with high wet strength is improved, the recovery rate of fiber is increased, the utilization value of the waste paper with high wet strength is greatly improved and the problems of resources and environment for limiting the development of the paper making industry in China can be solved.
Description
Technical field
The present invention relates to the pulping process of wet strong waste paper, relate in particular to a kind of pulping process of high wet strength waste paper.
Background technology
At present, China is the first in the world pulping and paper-making producing country, but there is the problem of forest reserves scarcity in China, cause pulping and paper-making fibre resources wretched insufficiency, thereby China is used non-wood-fiber (as wheat straw, bagasse, reed etc.) to carry out pulping and paper-making in a large number, recycle domestic waste paper and from a large amount of waste paper of external import, to solve the problem of China's fibre resources wretched insufficiency simultaneously.Day by day perfect along with Waste Paper Recycle Technique, waste paper has received the concern of countries in the world as a kind of fibre resources.In recent years, because grass fiber ratio in China's waste paper is higher, fiber recovery utilization rate was lower, and fiber quality is poor, thereby the more good imported waste papers (as high wet strength waste paper) of fiber quality have been subject to the favor of papermaking enterprise.The paper of high wet strength waste paper is pure, filler is few, without deinking, and raw fiber composition is the good needle-leaved wood fibre of quality and cotton pulp fiber, this type of waste paper can be joined and copy high-grade paper kind through the fiber of slurrying reuse, thereby the utilization of slurrying again of high wet strength waste paper fibre has obtained the very big attention of papermaking enterprise, and there is good development and application prospect.
The wet strength of general high wet strength paper is higher more than 30% than its dry strength, and this has just increased the recovery difficult of wet strong waste paper fibre.Traditional wet strong waste paper fibre process for reclaiming has Mechanical Method, thermochemical method and Re Fa, these methods exist energy consumption high, process that the poisonous organohalogen compounds of waste water (AOX) content is high, fiber is discongested the problems such as dispersion effect is poor, fiber recovery utilization rate is low, thereby limited the reuse of wet strong waste paper fibre.Therefore need research and development to be applicable to the pulping process of wet strong waste paper, to solve wet strong waste paper, discongest the problem that dispersion effect is poor, fiber recovery utilization rate is low, to improve the value of wet strong waste paper.
Summary of the invention
For above-mentioned prior art, in order to improve the pulpability of high wet strength waste paper, improve the utilization rate of its fibre resources, the invention provides a kind of ClO of using
2process the pulping process of high wet strength waste paper, thereby solve high wet strength waste paper fibre, discongest the problem that dispersion effect is poor, fiber recovery utilization rate is low.
The present invention is achieved by the following technical solutions:
A pulping process for high wet strength waste paper, adopts chlorine dioxide (ClO
2) carry out double diffusion, then utilize the efficient dispersion of mechanical force of hydrabrusher and defiberizing machine to discongest fiber, after screening, obtain the secondary stock that fiber dispersion is good and whiteness is high, thereby improve the pulpability of high wet strength waste paper, improve paper pulp yield, increase the value of high wet strength waste paper fibre.Specifically comprise the following steps:
(1) in order to improve the uniformity of slurrying, high wet strength waste paper is processed into the paper stock of 8～10cm * 2～3cm through paper cutter, use ClO
2process (first paragraph ClO
2preliminary treatment), utilize ClO
2strong oxidizing property carry out wet extensive chemical medicament in oxidation dissolution waste paper and destroy the hydrogen bond forming between fiber, thereby make waste paper fibre be easy to discongest, be dispersed into paper pulp; Processing mode is: by ClO
2join in slurry, with NaOH solution, regulate pH value to 4～5, under the condition of 50～70 ℃, carry out first paragraph ClO
2preliminary treatment;
(2) by above-mentioned process ClO
2the paper stock of processing carries out routine by hydrabrusher and discongests;
(3) slurry after above-mentioned discongesting is carried out to second segment ClO
2process, under the condition (by NaOH solution adjusting pH value) of 50～70 ℃ and pH value 4～5, process;
(4) above-mentioned through second segment ClO
2the slurry of processing carries out routine through deflaker and discongests;
(5) slurry after above-mentioned discongesting is washed by vacuum pulp washing machine;
(6) slurry after above-mentioned washing screens by pressurized screen, obtains the waste paper pulp that fiber dispersion is good.
In described step (1), carry out first paragraph ClO
2pretreated parameter is: the slurry of paper stock is dense is 5wt%, ClO
2consumption is 1～1.5%, and the processing time is 50～70min.
In described step (2), the parameter of discongesting is: the slurry of slurry is dense is 5wt%, and the time of discongesting is 60min.
In described step (3), carry out second segment ClO
2the parameter of processing is: the slurry of slurry is dense is 5wt%, ClO
2consumption is 0.5%, and the processing time is 10～20min.
In described step (4), the parameter that deflaker is discongested is: the slurry of slurry is dense is 4wt%, and the time of discongesting is 10min.
In described step (5), when vacuum pulp washing machine washs, the slurry of slurry is dense is 2.5wt%, and wash time is 30min.
In described step (6), when pressurized screen screens, the slurry of slurry is dense is 4wt%, and sieve seam width is 0.3mm.
The pulping process of high wet strength waste paper of the present invention, high wet strength waste paper, after cutting, carries out two sections of impregnation process with chemicals, after impregnation process completes, discongests, and the slurry after discongesting enters washing and screening operation.Conventional waste paper pulp-making technology is first to adopt clorox (NaClO) to process, and then carries out discongesting of wastepaper as raw material.In the present invention, adopt strong oxidizer chlorine dioxide in conjunction with mechanical force to high wet strength Waste Paper Handling, through two sections of chlorine dioxide treatment in conjunction with mechanical force, high wet strength waste paper fibre is carried out disperseing fully to discongest, through washing and screening, obtain secondary stock again, secondary stock can be delivered directly to copy paper operation and carry out copy paper.
The invention has the beneficial effects as follows:
(1) by chlorine dioxide to the dipping of high wet strength wastepaper as raw material and hydrabrusher, the mechanical force of defiberizing machine, the self-crosslinking of wet strength agent self and the co-crosslinking effect between wet strength agent and fiber have been weakened, be conducive to the removal of wet strength agent in wastepaper as raw material, the efficiency that has improved mechanical force, has reduced energy consumption;
(2) by the maceration of chlorine dioxide, reduced chemicals consumption in high wet strength Waste Paper Handling, reduced production cost;
(3) chlorine dioxide is a kind of strong oxidizer, be mainly to float agent in pulp and paper industry cleaning and bleaching operation, and in to wet strength agent effect, the effect that has bleaching to purify to paper pulp raw material;
(4) the present invention has improved the pulpability of high wet strength waste paper fibre, has improved the recovery utilization rate of fiber, and the value of high wet strength waste paper is improved greatly, can solve the resources and environment problem of puzzlement China Paper Industry Development.
The specific embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Except have special instruction, all percentages related in embodiment are mass percent.
Embodiment of the present invention high wet strength waste paper used is imported from America high wet strength waste paper limit, and whiteness is 76.2%ISO.
Embodiment 1 high wet strength waste paper utilization tradition pulping process carries out slurrying
High wet strength waste paper carries out according to the following steps slurrying after cut paper:
1. high wet strength waste paper is after cutting, and with one section of processing of clorox, treatment conditions are 65～75 ℃ of temperature, time 70min, and pH value 1～3, NaClO consumption 3%, starches dense 5%;
2. by processing gained waste paper material in above-mentioned steps 1, by hydrabrusher, discongest, discongest condition for slurry dense 5%, time 60min;
3. the slurry of processing gained in above-mentioned steps 3 is discongested by deflaker, discongesting slurry dense is 4%;
4. the slurry of processing gained in above-mentioned steps 4 is washed by vacuum pulp washing machine, detergent milk is dense is 2.5%;
5. the slurry of processing gained in above-mentioned steps 5 is washed by vacuum pulp washing machine again, detergent milk is dense is 4%, then by pressurized screen, screens, and sieve seam width is 0.3mm, obtains wet strong secondary stock.
Result: through Performance Detection, the secondary stock whiteness 78.9%ISO of above-mentioned conventional process step gained, yield 89.2%, length 1.049mm.
Embodiment 2 high wet strength waste paper utilization pulping process of the present invention carries out slurrying
High wet strength waste paper carries out according to the following steps slurrying after cut paper:
1. high wet strength waste paper, after cutting, carries out first paragraph processing with chlorine dioxide, and treatment conditions are 50～55 ℃ of temperature, time 50min, pH value 4～5, ClO
2consumption 1%, starches dense 5%;
2. by processing gained waste paper material in above-mentioned steps 1, by hydrabrusher, discongest, discongest condition for slurry dense 5%, time 60min;
3. the slurry of processing gained in above-mentioned steps 2 is carried out to second segment chlorine dioxide treatment, treatment conditions are 50～55 ℃ of temperature, time 10min, pH value 4～5, ClO
2consumption 0.5%, starches dense 5%;
4. the slurry of processing gained in above-mentioned steps 3 is discongested by deflaker, discongesting slurry dense is 4%, and the time is 10min;
5. the slurry of processing gained in above-mentioned steps 4 is washed by vacuum pulp washing machine, detergent milk is dense is 2.5%, and the time is 30min;
6. the slurry of processing gained in above-mentioned steps 5 is washed by vacuum pulp washing machine again, detergent milk is dense is 4%, then by pressurized screen, screens, and sieve seam width is 0.3mm, obtains wet strong secondary stock.
Result: through Performance Detection, the secondary stock whiteness 82.1%ISO of above-mentioned treatment step gained, yield 97.1%, length 1.083mm.The secondary stock (embodiment 1) of processing with conventional NaClO under same treatment process conditions is compared, and pulp brightness improves 4.1%ISO, and paper pulp yield improves 8.9%, and average fiber length improves 3.2%.
Embodiment 3 high wet strength waste paper utilization pulping process of the present invention carries out slurrying
High wet strength waste paper carries out according to the following steps slurrying again after cut paper:
1. the high wet strength waste paper after cutting first carries out first paragraph chlorine dioxide treatment, and treatment conditions are 60～70 ℃ of temperature, time 50min, pH value 4～5, ClO
2consumption 1%, starches dense 5%;
2. by processing gained waste paper material in above-mentioned steps 1, by hydrabrusher, discongest, discongest condition for slurry dense 5%, time 60min;
3. the slurry of processing gained in above-mentioned steps 2 is carried out to second segment chlorine dioxide treatment, treatment conditions are 60～70 ℃ of temperature, time 10min, pH value 4～5, ClO
2consumption 0.5%, starches dense 5%;
4. the slurry of processing gained in above-mentioned steps 3 is discongested by deflaker, discongesting slurry dense is 4%, and the time is 10min;
5. the slurry of processing gained in above-mentioned steps 4 is washed by vacuum pulp washing machine, detergent milk is dense is 2.5%, and the time is 30min;
6. the slurry of processing gained in above-mentioned steps 5 is washed by vacuum pulp washing machine again, detergent milk is dense is 4%, then by pressurized screen, screens, and sieve seam width is 0.3mm, obtains wet strong secondary stock.
Result: through Performance Detection, the secondary stock whiteness 84.2%ISO of above-mentioned treatment step gained, yield 96.5%, length 1.078mm.The secondary stock of processing with conventional NaClO under same treatment process conditions is compared, and pulp brightness improves 7.5%, and paper pulp yield improves 8.2%, and average fiber length improves 2.8%.
Embodiment 4 high wet strength waste paper utilization pulping process of the present invention carries out slurrying
The strong waste paper of high humidity carries out according to the following steps slurrying again after cut paper:
1. the strong waste paper of the high humidity after cutting first carries out first paragraph chlorine dioxide treatment, and treatment conditions are 60～70 ℃ of temperature, time 60min, pH value 4～5, ClO
2consumption 1%, starches dense 5%;
2. by processing gained waste paper material in above-mentioned steps 1, by hydrabrusher, discongest, discongest condition for slurry dense 5%, time 60min;
3. by processing gained slurry in above-mentioned steps 2, carry out second segment chlorine dioxide treatment, treatment conditions are 60～70 ℃ of temperature, time 20min, pH value 4～5, ClO
2consumption 0.5%, starches dense 5%;
4. the slurry of processing gained in above-mentioned steps 3 is discongested by deflaker, discongesting slurry dense is 4%, and the time is 10min;
5. the slurry of processing gained in above-mentioned steps 4 is washed by vacuum pulp washing machine, detergent milk is dense is 2.5%, and the time is 30min;
6. the slurry of processing gained in above-mentioned steps 5 is washed by vacuum pulp washing machine again, detergent milk is dense is 4%, then by pressurized screen, screens, and sieve seam width is 0.3mm, obtains wet strong secondary stock.
Result: through Performance Detection, the secondary stock whiteness 84.8%ISO of above-mentioned treatment step gained, yield 95.9%, length 1.072mm.The secondary stock of processing with conventional NaClO under same treatment process conditions is compared, and pulp brightness improves 8.5%, and paper pulp yield improves 7.5%, and average fiber length improves 2.2%.
Embodiment 5 high wet strength waste paper utilization pulping process of the present invention carries out slurrying
High wet strength waste paper carries out according to the following steps slurrying again after cut paper:
1. the high wet strength waste paper after cutting first carries out first paragraph chlorine dioxide treatment, and treatment conditions are 60～70 ℃ of temperature, time 60min, pH value 4～5, ClO
2consumption 1.5%, starches dense 5%;
2. by processing gained waste paper material in above-mentioned steps 1, by hydrabrusher, discongest, discongest condition for slurry dense 5%, time 60min;
3. the slurry of processing gained in above-mentioned steps 2 is carried out to second segment chlorine dioxide treatment, treatment conditions are 60～70 ℃ of temperature, time 20min, pH value 4～5, ClO
2consumption 0.5%, starches dense 5%;
4. the slurry of processing gained in above-mentioned steps 3 is discongested by deflaker, discongesting slurry dense is 4%, and the time is 10min;
5. the slurry of processing gained in above-mentioned steps 4 is washed by vacuum pulp washing machine, detergent milk is dense is 2.5%, and the time is 30min;
6. the slurry of processing gained in above-mentioned steps 5 is washed by vacuum pulp washing machine again, detergent milk is dense is 4%, then by pressurized screen, screens, and sieve seam width is 0.3mm, obtains wet strong secondary stock.
Result: through Performance Detection, the secondary stock whiteness 85.9%ISO of above-mentioned treatment step gained, yield 93.2%, length 1.062mm.The secondary stock of processing with conventional NaClO under same treatment process conditions is compared, and pulp brightness improves 10.3%, and paper pulp yield improves 4.5%, and average fiber length improves 1.2%.
Embodiment 6 high wet strength waste paper utilization pulping process of the present invention carries out slurrying
High wet strength waste paper carries out according to the following steps slurrying again after cut paper:
1. the high wet strength waste paper after cutting first carries out first paragraph chlorine dioxide treatment, and treatment conditions are 50～55 ℃ of temperature, time 70min, pH value 4～5, ClO
2consumption 1%, starches dense 5%;
2. by the waste paper material of processing in above-mentioned steps 1, by hydrabrusher, discongest, discongest condition for slurry dense 5%, time 60min;
3. the slurry of processing gained in above-mentioned steps 2 is carried out to second segment chlorine dioxide treatment, treatment conditions are 50～55 ℃ of temperature, time 20min, pH value 4～5, ClO
2consumption 0.5%, starches dense 5%;
4. the slurry of processing gained in above-mentioned steps 3 is discongested by deflaker, discongesting slurry dense is 4%, and the time is 10min;
5. the slurry of processing gained in above-mentioned steps 4 is washed by vacuum pulp washing machine, detergent milk is dense is 2.5%, and the time is 30min;
6. the slurry of processing gained in above-mentioned steps 5 is washed by vacuum pulp washing machine again, detergent milk is dense is 4%, then by pressurized screen, screens, and sieve seam width is 0.3mm, obtains wet strong secondary stock.
Result: through Performance Detection, the secondary stock whiteness 83.3%ISO of above-mentioned treatment step gained, yield 96.1%, length 1.073mm.The secondary stock of processing with conventional NaClO under same treatment process conditions is compared, and pulp brightness improves 6.1%, and paper pulp yield improves 7.8%, and average fiber length improves 2.3%.
Claims (7)
1. a pulping process for high wet strength waste paper, is characterized in that: comprise the following steps:
(1) high wet strength Waste Paper Handling is become to the paper stock of 8～10cm * 2～3cm, use ClO
2process, processing mode is: by ClO
2join in slurry, with NaOH solution, regulate pH value to 4～5, under the condition of 50～70 ℃, carry out first paragraph ClO
2preliminary treatment;
(2) by above-mentioned process ClO
2the paper stock of processing carries out routine by hydrabrusher and discongests;
(3) slurry after above-mentioned discongesting is carried out to second segment ClO
2process, under the condition of 50～70 ℃ and pH value 4～5, process;
(4) above-mentioned through second segment ClO
2the slurry of processing carries out routine through deflaker and discongests;
(5) slurry after above-mentioned discongesting is washed by vacuum pulp washing machine;
(6) slurry after above-mentioned washing screens by pressurized screen, obtains the waste paper pulp that fiber dispersion is good.
2. the pulping process of a kind of high wet strength waste paper according to claim 1, is characterized in that: in described step (1), carry out first paragraph ClO
2pretreated parameter is: the slurry of paper stock is dense is 5wt%, ClO
2consumption is 1～1.5%, and the processing time is 50～70min.
3. the pulping process of a kind of high wet strength waste paper according to claim 1, is characterized in that: in described step (2), the parameter of discongesting is: the dense 5wt% of being of slurry of slurry, the time of discongesting is 60min.
4. the pulping process of a kind of high wet strength waste paper according to claim 1, is characterized in that: in described step (3), carry out second segment ClO
2the parameter of processing is: the slurry of slurry is dense is 5wt%, ClO
2consumption is 0.5%, and the processing time is 10～20min.
5. the pulping process of a kind of high wet strength waste paper according to claim 1, is characterized in that: in described step (4), the parameter that deflaker is discongested is: the dense 4wt% of being of slurry of slurry, the time of discongesting is 10min.
6. the pulping process of a kind of high wet strength waste paper according to claim 1, is characterized in that: in described step (5), when vacuum pulp washing machine washs, the slurry of slurry is dense is 2.5wt%, and wash time is 30min.
7. the pulping process of a kind of high wet strength waste paper according to claim 1, is characterized in that: in described step (6), when pressurized screen screens, the slurry of slurry is dense is 4wt%, and sieve seam width is 0.3mm.
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| CN103526629B CN103526629B (en) | 2014-12-31 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164805A (en) * | 2014-06-27 | 2014-11-26 | 南京林业大学 | A method of enhancing papermaking wet-end paper strength by applying betaine amphoteric cellulose |
| CN104947490A (en) * | 2014-03-24 | 2015-09-30 | 上海嘉龙纸业有限公司 | Regeneration method of special wastepaper and application of regenerated special wastepaper |
| CN106337311A (en) * | 2015-07-11 | 2017-01-18 | 陈福堂 | Extraordinary wet-strength paper processing auxiliary agent and application method thereof |
| CN107881847A (en) * | 2017-12-29 | 2018-04-06 | 安徽宏实光机电高科有限公司 | A kind of method using wet strong waste paper manufacture regenerated paper pulp wrapping paper |
| CN115976867A (en) * | 2023-01-11 | 2023-04-18 | 广东华凯科技股份有限公司 | Composition capable of quickly dissociating wet strength paper and preparation method and application thereof |
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| JPH05125684A (en) * | 1991-11-05 | 1993-05-21 | Nippon Kakoh Seishi Kk | Reclamation of waste paper containing toner ink |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104947490A (en) * | 2014-03-24 | 2015-09-30 | 上海嘉龙纸业有限公司 | Regeneration method of special wastepaper and application of regenerated special wastepaper |
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| CN106337311A (en) * | 2015-07-11 | 2017-01-18 | 陈福堂 | Extraordinary wet-strength paper processing auxiliary agent and application method thereof |
| CN107881847A (en) * | 2017-12-29 | 2018-04-06 | 安徽宏实光机电高科有限公司 | A kind of method using wet strong waste paper manufacture regenerated paper pulp wrapping paper |
| CN115976867A (en) * | 2023-01-11 | 2023-04-18 | 广东华凯科技股份有限公司 | Composition capable of quickly dissociating wet strength paper and preparation method and application thereof |
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| Publication number | Publication date |
|---|---|
| CN103526629B (en) | 2014-12-31 |
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