CN102691228A - Post-processing process of cotton-wood composite pulp - Google Patents
Post-processing process of cotton-wood composite pulp Download PDFInfo
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- CN102691228A CN102691228A CN2012101707222A CN201210170722A CN102691228A CN 102691228 A CN102691228 A CN 102691228A CN 2012101707222 A CN2012101707222 A CN 2012101707222A CN 201210170722 A CN201210170722 A CN 201210170722A CN 102691228 A CN102691228 A CN 102691228A
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Abstract
The invention provides a post-processing process using composite pulp of cotton linters and wood pulp as raw materials to produce viscose pulp by aiming at characteristics of cotton-wood composite pulp. The post-processing process of the cotton-wood composite pulp includes the steps of chlorination, bleaching, washing and papermaking. In the post-processing process, the selected cotton linters accounts for 70-99% of the cotton-wood composite pulp while the wood pulp accounts for 1-30% of the cotton-wood composite pulp, and the composite pulp has the parameter indexes: alpha cellulose>=91%, degree of polymerization<=1200, ash content<=0.13, whiteness>=91%, viscosity<=13 and iron<=30ppm. The pulp feeding concentration in the post-processing process ranges from 3% to 5%, the pulp is acidized firstly in a pre-acidizing pool to enable a pH (potential of hydrogen) value to be regulated to 1-3 at the normal temperature, then the acidized pulp is fed to a chlorination tower, and the bleaching temperature ranges from 30 DEG C to 65 DEG C. Equipment and operation are simple in the whole process procedure, and the post-processing process is convenient to use, high in production efficiency and stable in product quality.
Description
Technical field
The invention belongs to compound pulp sex change is the aftertreatment technology link in the cellulose viscose pulp production technology, is specially adapted to the chlorination of the compound pulp of the cotton pulp dregs of rice and wood pulps-bleach-wash-the aftertreatment technology technical field of manufacturing paper with pulp.
Background technology
Viscose is one type of common chemical fiber, and the technological process of its production is following: slurrying → preparation spinning solution → spinning → post processing → finished product, wherein, what obtain through slurrying is the viscose glue pulp.Traditional viscose glue pulp is to be raw material with timber and cotton linter etc., through raw material is carried out selection, getting the raw materials ready, Physical Processing or Chemical Pretreatment, boiling, bleaching, acid treatment, washing and a series of operation such as manufacture paper with pulp is prepared from.
Development along with China's viscose industry; Domestic enterprise is many with the raw materials for production of the cotton pulp dregs of rice as viscose; The resource of raw material cotton linter receive cultivated area and growth cycle restriction and day by day the shortage; But receive the influence of domestic cultivated area, growth cycle and the ecological balance, seriously restricted the development of China's viscose industry.Existing for this reason enterprise attempts with bamboo pulp and the wood pulps raw materials for production as viscose; And obtained initial success, be the production technology that the patent of invention of CN02112175.3 (name is called " bamboo pulp denatured productive technology ") discloses a kind of bamboo pulp like the patent No.; Some patent discloses a kind of production technology of wood pulps respectively, comprises that the patent No. is that CN200610021387.4 (name is called " Wood pomace modified producing technology "), the patent No. are that CN200710050465.8 (name is called " paper-making-stage high viscosity wood pulp plate denaturalization producing technique "), the patent No. are that CN200710050466.2 (name is called " paper-making-stage reclaiming wood pulp plate denaturalization producing technique "), the patent No. are that CN200710050467.7 (name is called " paper-making-stage broad-leaved wood pulp plate denaturalization producing technique "), the patent No. are that CN200710050469.6 (" name is called modified production process of paper making level sulphate wood pulp plate "), the patent No. are that CN200710050470.9 (name is called " paper-making grade softwood pulp plate modifying production technique "), the patent No. are that CN200710050471.3 (name is called " paper-making-stage wood pulp plate denaturalization producing technique "), the patent No. are that CN200710050472.8 (name is called " paper-making-stage bamboo wood pulp plate denaturalization producing technique "), the patent No. are CN200710050473.2 (name is called " paper-making-stage primary color wood pulp plate denaturalization producing technique ") etc.
Raising along with science and technology development and living standards of the people; Very big transformation has taken place in people's consumption idea and concept of health; The consumer is also increasingly high to the requirement of textile product; Aspect dress, not only require beautiful and comfortable, be particular about individual character fashion, and can be antibacterial, antibiotic, be easy to nursing, health environment-friendly.
The viscose of raw material production such as cotton, wood, bamboo, fiber crops respectively has characteristics; And the viscose performance of only producing with a kind of pulp is dull; Two kinds and above pulp are carried out the excellent properties that compound preparation cellulose viscose pulp can be brought into play various fibers; Maximize favourable factors and minimize unfavourable ones, remedy each other, make the premium properties of every kind of fiber be able to represent.
Cotton linter is big because of content of cellulose height, technical maturity, cotton planting amount, although cotton linter price one tunnel was high in recent years, is still the main raw material of producing viscose at present.Formerly the patent No. is the new approaches that the patent of invention of CN200610020971.8 (name is called " cotton, wood composite cellulose pulp and manufacturing approach " thereof) has proposed New Viscose Fibre pulp and production thereof; Disclose a kind of novel pulp of composite fibre and manufacturing technique thereof of producing, can effectively advantage cotton, wood fiber raw material have been put together by cotton, wooden mixing.Yet, with different sex change production processes the different production requirement is arranged according to the different production raw material, carrying out need providing bleaching process pointedly when sex change is produced.Like the patent No. is the CN200810147984.0 patent of invention of (name is called " method for bleaching and the application thereof that are used to prepare bamboo chemical dissolving pulp "); To present situation and bamboo wood characteristics cotton, wooden dissolving pulp, a kind of method for bleaching that is used to prepare bamboo chemical dissolving pulp has been proposed.
Therefore, the method for bleaching that is formerly adopted in the aftertreatment technology of patent CN200610020971.8 is inappropriate for the bleaching of cotton, wooden compound pulp.
Summary of the invention
In order to overcome the product lack of homogeneity that existing cotton linter is produced; Receive the restriction of cotton linter quality; Be difficult to large-scale production and existing bleaching process and be inappropriate for the problem of the bleaching of cotton, wooden compound pulp; The present invention is directed to the characteristic of cotton, wooden compound pulp itself, propose a kind of compound pulp and be used for the aftertreatment technology that cellulose viscose pulp is produced as raw material with cotton linter and wood pulps.Whole process process equipment of the present invention, simple to operate, easy to use, production efficiency is high, constant product quality.
The present invention adopts the compound pulp of cotton linter and wood pulps as not bleaching raw material, and technical process comprises: chlorination-bleach-wash-manufacture paper with pulp.
The aftertreatment technology of a kind of cotton, wooden compound pulp comprises: chlorination-bleach-wash-manufacture paper with pulp is characterized in that: cotton linter accounts for 70-99% in selected cotton, the wooden compound pulp; Wood pulps accounts for 1-30%, and compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200; Ash content≤0.13%; Whiteness>=91%, viscosity≤13, irony≤30ppm.
Described chlorination is meant: at normal temperatures, first acid treatment is regulated pH value to 1-3 in preparatory sour pond, sends into the chlorination tower, and chlorine is pressed the slurry oven dry weight and added 0.5-2%, and time of chlorinating 0.5-1.5 hour, get into the alkalization pond, adding caustic soda to alkalinity is 10-200g/m
3
Acid treatment is regulated pH value to 1-3 in the described preparatory sour pond, and it is bleached under the chlorine molecular state at the very start, avoids neutral bleaching, protects first fine simultaneously.
Preferably, described caustic soda to the alkalinity that adds is 60-80g/l, can effectively shorten bleaching time, falls and gathers easily, and whiteness is high.
Described bleaching is meant: the compound pulp after the chloridized is sent into the Bellmer of transferring behind the alkali carry out sodium hypochlorite bleaching, after dechlorination, acid treatment, promptly accomplish bleaching.Described accent alkali number is 20-200g/m
3Described clorox consumption 0.1-0.7g/l; In the described dechlorination operation hypo consumption be residual chlorine 1.8-2 doubly.The consumption that the reagent that said acid treatment is used reaches by the slurry oven dry weight is: hydrochloric acid consumption 1-3%, calgon consumption 0.5-1.5%, consumption of oxalic acid 0.5-1.5%.
Adopt in the acid treatment that three kinds of reagent are shared to help to shorten flow process, saved the washing link between chlorination and the bleaching, practiced thrift the water source, the while can effectively be removed residual chlorine and gray iron.
Preferably, described caustic soda to the alkalinity that adds is 60-80g/l, can effectively shorten bleaching time, falls and gathers easily, and whiteness is high.
It is 3-5% that described aftertreatment technology advances to starch concentration, can effectively improve uniformity, and the bleaching product is dissolved in the water, and removes through washing.
Described bleaching temperature is 30-65 ℃, and the purpose of intensification is in order to improve reaction speed and osmotic effect.
The described sodium hypochlorite bleaching time is 18-25 minute, can improve whiteness better.
The said acid-treated processing time is 30-60 minute, and hydrochloric acid and grey iron substance are fully reacted.
The described process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
Desanding concentration: 0.6-1.5% manufactures paper with pulp;
Desanding pressure: 0.15-0.32Mpa manufactures paper with pulp;
The water of sizing mixing: clear water, plain boiled water;
Online concentration: 0.6-1.5%;
One squeeze pressure: 0.1-0.3Mpa;
Second press pressure: 0.2-0.5Mpa;
Three road squeeze pressure: 0.3-0.7Mpa;
Drying cylinder steam pressure: 0.15-0.35Mpa;
Cut paper specification: 600*800;
Metering specification: 100-250Kg/ bag.
Preferably, cotton linter accounts for 85-95% in described cotton, the wooden compound pulp, and wood pulps accounts for 5-15%.Finished product pulp shaping evenness is good, and intensity is high, and first is fine high, and yield is high, and ash content is low, and reactivity worth is good.
Described cotton, wooden compound pulp are the compound pulp of cotton linter and needlebush paper pulp, cotton linter and leaf wood paper pulp.
Described wood pulps can be natural color pulp as the raw material of compound pulp, also can be bleached pulp.
The viscose that the present invention uses does not float after cotton, wooden compound pulp raw material and the bleaching is compared with pulp, and its quality index is:
| Index | Before the bleaching | After the bleaching |
| Viscosity (Mpa.s) | 10.5-12.5 | 8.9-12.1 |
| First fine (%) | ≥89 | ≥92 |
| Ash (%) | ≤0.30 | ≤0.12 |
| Fe（ppm） | ≤50 | ≤22 |
| Whiteness (%) | ≥60 | ≥79 |
| The degree of polymerization | ≤800-1200 | ≤600-1000 |
| Reactivity worth 7mlCS 2 （S） | ≤250ml | ≤250ml |
The present invention optimizes cotton, wooden compound pulp aftertreatment technology targetedly, and optimized process conditions is provided, and the fiber pulp quality of production can meet the production requirement of viscose fully.Through the optimization to the aftertreatment technology parameter system, the product of being produced has the advantages that the first fiber content is high, whiteness is high, gray iron is low, reactivity worth is good.Concrete beneficial effect is following:
(1) because the present invention uses is that the compound pulp of cotton linter and wood pulps is raw material, brings into play the excellent properties of two kinds of fibers, cotton linter has been combined with the excellent properties of wood pulps, overcome the shortcoming of the product lack of homogeneity of existing cotton linter production.
(2), and prove that the kind of used paper pulp does not receive the restriction of production method and raw material, can be natural color pulp, can be bleached pulp yet because the whole process process equipment of the present invention, simple to operate through test of many times, easy to use, be easy to realize.
(3) owing to the present invention optimizes cotton, wooden compound pulp aftertreatment technology targetedly; Through to the raw-material process optimization in certain indication range; Obtained optimized process conditions, therefore, the efficient of production is higher; The product quality that obtains is more stable, is specially adapted to the aftertreatment technology of cotton, wooden compound pulp.
(4) since in the preparatory sour pond acid treatment regulate pH value to 1-3, pulp is bleached under the chlorine molecular state at the very start, avoid neutral bleaching, protect first fine simultaneously, make the pulp methyl fiber dimension hplc after the bleaching high.
(5) because bleaching temperature is controlled at 30-65 ℃, effectively improved the reaction speed and the osmotic effect of bleaching, the product whiteness after the bleaching is improved.
(6) cotton linter accounts for 85-95% in cotton, the wooden compound pulp owing to having controlled, and wood pulps accounts for 5-15%, has guaranteed that the grey iron content of product is low, and reactivity worth is good.
The specific embodiment
Below in conjunction with several preferred embodiments the present invention is done further explain:
Embodiment 1
Cotton linter and true qualities leaf wood paper pulp are as not floating compound slurry
Cotton linter accounts for 99% in selected cotton, the wooden compound pulp, and wood pulps accounts for 1%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 3%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 3, get into the chlorination tower, the chlorine consumption is 0.6%, time of chlorinating 0.5 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3
Get into Bellmer, steam is warming up to 65 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 100g/m
3, bleaching uses the clorox consumption to be 0.6g/l, 20 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 2 of residual chlorine dose in the slurry, and add 3% hydrochloric acid again, 1.5% oxalic acid, 1.5% calgon carried out acid treatment 60 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 1%;
Desanding pressure: 0.15Mpa manufactures paper with pulp;
The water of sizing mixing: clear water;
Online concentration: 1.5%;
One squeeze pressure: 0.2Mpa;
Second press pressure: 0.2Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.35Mpa;
Cut paper specification: 600*800;
Metering specification: 200Kg/ bag.
Embodiment 2
Cotton linter and true qualities leaf wood paper pulp are as not floating compound slurry
Cotton linter accounts for 85% in selected cotton, the wooden compound pulp, and wood pulps accounts for 15%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 5%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 3, get into the chlorination tower, the chlorine consumption is 2%, time of chlorinating 0.5 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 60g/m
3
Get into Bellmer, steam is warming up to 3 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 50g/m
3, bleaching uses the clorox consumption to be 0.7g/l, 18 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 2 of residual chlorine dose in the slurry, and add 1% hydrochloric acid again, 0.5% oxalic acid, 1% calgon carried out acid treatment 30 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 0.6%;
Desanding pressure: 0.3Mpa manufactures paper with pulp;
The water of sizing mixing: clear water;
Online concentration: 0.6%;
One squeeze pressure: 0.3Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.3Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 100Kg/ bag.
Embodiment 3
Cotton linter and bleaching leaf wood paper pulp are as not floating compound slurry
Cotton linter accounts for 80% in selected cotton, the wooden compound pulp, and wood pulps accounts for 20%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 3%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 2, get into the chlorination tower, the chlorine consumption is 0.5%, time of chlorinating 1.5 hours gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3
Get into Bellmer, steam is warming up to 30 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 80g/m
3, bleaching uses the clorox consumption to be 0.1g/l, 20 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 1.8 of residual chlorine dose in the slurry, and add 1% hydrochloric acid again, 1.5% oxalic acid, 1.5% calgon carried out acid treatment 40 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 0.6%;
Desanding pressure: 0.32Mpa manufactures paper with pulp;
The water of sizing mixing: clear water;
Online concentration: 1.5%;
One squeeze pressure: 0.3Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.35Mpa;
Cut paper specification: 600*800;
Metering specification: 250Kg/ bag.
Embodiment 4
Cotton linter and bleaching leaf wood paper pulp are as not floating compound slurry
Cotton linter accounts for 70% in selected cotton, the wooden compound pulp, and wood pulps accounts for 30%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 3%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 1, get into the chlorination tower, the chlorine consumption is 1.5%, time of chlorinating 0.5 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 10g/m
3
Get into Bellmer, steam is warming up to 35 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 20g/m
3, bleaching uses the clorox consumption to be 0.5g/l, 25 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 1.9 of residual chlorine dose in the slurry, and add 1% hydrochloric acid again, 0.5% oxalic acid, 1.5% calgon carried out acid treatment 40 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 0.8%;
Desanding pressure: 0.15Mpa manufactures paper with pulp;
The water of sizing mixing: clear water;
Online concentration: 0.6%;
One squeeze pressure: 0.3Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.3Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 200Kg/ bag.
Embodiment 5
Cotton linter and true qualities needlebush paper pulp are as not floating compound slurry
Cotton linter accounts for 95% in selected cotton, the wooden compound pulp, and wood pulps accounts for 15%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 4%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 3, get into the chlorination tower, the chlorine consumption is 0.5%, time of chlorinating 1.5 hours gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 60g/m
3
Get into Bellmer, steam is warming up to 60 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 100g/m
3, bleaching uses the clorox consumption to be 0.1g/l, 20 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 2 of residual chlorine dose in the slurry, and add 3% hydrochloric acid again, 0.5% oxalic acid, 1% calgon carried out acid treatment 60 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 1.5%;
Desanding pressure: 0.3Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 1%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.35Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.35Mpa;
Cut paper specification: 600*800;
Metering specification: 250Kg/ bag.
Embodiment 6
Cotton linter and true qualities needlebush paper pulp are as not floating compound slurry
Cotton linter accounts for 90% in selected cotton, the wooden compound pulp, and wood pulps accounts for 10%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 5%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 2, get into the chlorination tower, the chlorine consumption is 2%, time of chlorinating 0.8 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 150g/m
3
Get into Bellmer, steam is warming up to 65 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 150g/m
3, bleaching uses the clorox consumption to be 0.1g/l, 22 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 2 of residual chlorine dose in the slurry, and add 1% hydrochloric acid again, 0.5% oxalic acid, 0.5% calgon carried out acid treatment 60 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 1.5%;
Desanding pressure: 0.15Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 0.8%;
One squeeze pressure: 0.3Mpa;
Second press pressure: 0.4Mpa;
Three road squeeze pressure: 0.5Mpa;
Drying cylinder steam pressure: 0.2Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 7
Cotton linter and the raw material of bleaching needlebush paper pulp as compound pulp
Cotton linter accounts for 99% in selected cotton, the wooden compound pulp, and wood pulps accounts for 1%.
Cotton linter comprises following processing step with the preparation technology of the compound pulp of bleaching needlebush paper pulp:
The first step: procedure for preparation
A, raw material are prepared
Ratio according to cotton linter and bleaching needlebush paper pulp gross weight and boiling vessel volume is 100～250kg:1m
3Get the raw materials ready, choose cotton linter and bleaching needlebush paper pulp; Get the raw materials ready according to aforementioned proportion, make that the density in the boiling vessel is moderate;
B, dispersion and pulping
Cotton linter is become pulp board with bleaching needlebush paper pulp dispersion treatment; Then cotton linter and bleaching needlebush paper pulp are mixed with sodium hydroxide solution; Carrying out pulping handles; The mixture that obtains cotton linter, bleaching needlebush paper pulp and sodium hydroxide solution is promptly starched congee, carries out next step impregnation process again, and the slurry concentration of the described slurry congee that processing obtains through pulping is 3～5%;
The concentration of the sodium hydroxide solution of above-mentioned adding is 1:3～4 by the liquor ratio among the final step F; Sodium hydrate solid weight is 17～22% controls with the percentage of starching fiber over dry gross weight in the congee; Sodium hydroxide solution may lose among step C, D and the E; Can add sodium hydroxide solution in the step F, make that liquor ratio is 1:3～4, sodium hydrate solid weight is 17～22% with the percentage of starching fiber over dry gross weight in the congee.
The raw material paper pulp of buying back is one to wrap, and disperses to adopt bale opener that packing is opened, and re-uses the paging cutter raw material is divided into pulp board one by one, uses the belt conveyor of feeding dregs of rice machine to carry pulp board to hydrabrusher at last;
Slurry concentration is this area technical term, is meant fiber over dry gross weight and the percentage of cotton linter with mixture (promptly the starching congee) weight of bleaching needlebush paper pulp and sodium hydroxide solution in cotton linter and the bleaching needlebush paper pulp.
In cotton linter and bleaching needlebush paper pulp are mixed with sodium hydroxide solution described in the step B; Carrying out pulping handles and to be meant cotton linter and bleaching needlebush paper pulp are delivered to hydrabrusher with the transporting velocity of 85～200kg/min; Add sodium hydroxide solution simultaneously and carry out the pulping processing, and the discharging speed after the pulping processing is 2.8～6m
3/ min.
The electric machine frequency of above-mentioned hydrabrusher is 15～30Hz.
C, dipping
To through the slurry congee that dispersion pulping to obtain and carry out impregnation process;
In the time of the dipping described in the step C is 1～20 minute, and dipping temperature is 10～40 ℃, and dipping back slurry concentration is 2～5%.
Liquid is taken off in D, squeezing
The slurry congee that will pass through dipping squeezes and takes off liquid, and it is 20～35% to starching the congee mass dryness fraction that liquid is taken off in squeezing;
Mass dryness fraction is this area technical term, is meant the percentage of mixture (promptly the starching congee) weight of liquid weight and cotton linter, bleaching needlebush paper pulp and sodium hydroxide solution.
The Pressure control of taking off liquid in the squeezing described in the step D is 0.4～0.5MPa.
The slurry congee alkalinity that takes off liquid in the process squeezing described in the step D is 3.0～5.1%, and methylcellulose content is 20～25%.
E, pulverizing
To pass through the slurry congee that squeezing takes off liquid is ground into cotton-shaped or single fiber;
Send in the pulverizer with the speed of 85～200kg/min for the slurry congee that will pass through squeezing and take off liquid in the pulverizing described in the step e and to pulverize.
Second step: cooking process
The slurry congee that is ground into cotton-shaped or single fiber is sent into continuous steamer carry out boiling.
When continuously cooking, in continuous steamer, add alkali lye through T shape pipe, alkali lye is selected NaOH and Na for use
2SO
3Mixture, its mixed proportion is: NaOH:Na
2SO
3=90%:10% presses 17% of oven dry weight and adds, liquor ratio: 1:2.0, and one section the vapor (steam) temperature that links to each other with the pre-reaction feed bin of Lian Zhengguan is 100 ℃, middle one section vapor (steam) temperature is 135 ℃, 145 ℃ of one section the vapor (steam) temperatures that links to each other with cold spraying device; Compression ratio: 1:2.
The 3rd step: washing procedure
Adopt the multistage counter current washing process, its technical process is:
A adds black liquor from the thick slurry of boiling in spraying pot, make the concentration of high underflow be reduced to 2.4%, adds washing assisant Busperse 2838 then, and consumption is 0.6 kilogram of/ton slurry, mixes 12 minutes, gets by carrying stock pump, gets into I section wash engine;
B carries out spray washing by the black liquor that II section black liquor groove provides, and the black liquor after the washing gets into I section black liquor groove, and I section black liquor channel black liquid temp is 70 ℃;
C starches subsequently and gets into II section wash engine, carries out spray washing by the washing reuse plain boiled water of III section black liquor groove, and the cleaning solution after washing gets into II section filtrate tank and for the preceding paragraph pulp grinder washings is provided;
D starches at last and gets into III section wash engine, carries out spray washing by the cleaning solution that adds, and the cleaning solution after washing gets into III section filtrate tank, and the slurry after the washing gets into the slurry tower.
Described I section wash engine adopts spiral guipure wash engine, and technological parameter is:
Advance to starch concentration 4%
Pulp concentration 10%
Speed of a motor vehicle 45m/min
Temperature normal temperature
Pulp pH value 9
Wash degree 60g/m3
Clean pressure-0.01Mpa
Wash time 45min/ criticizes
Described II section wash engine adopts decker, and technological parameter is:
Advance to starch concentration 6%
Pulp concentration 12%
The speed of a motor vehicle 9 commentaries on classics/min
Temperature normal temperature
Pulp pH value 7
Wash degree 30g/m3
Clean pressure 0.2Mpa
Wash time 40min/ criticizes
Described III section wash engine adopts vacuum pulp washing machine equipment, and technological parameter is:
Advance to starch concentration 5%
Pulp concentration 12%
The speed of a motor vehicle 4 commentaries on classics/min
Temperature normal temperature
Pulp pH value 6
The residual alkali number of wash degree is controlled at below the 0.05g/L
Clean pressure 0.04Mpa
Wash time 60min/ criticizes
The 4th step: postprocessing working procedures
Compound pulp through behind boiling and the washing procedure has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 4%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 1, get into the chlorination tower, the chlorine consumption is 1.5%, time of chlorinating 1 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3
Get into Bellmer, steam is warming up to 35 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 60g/m
3, bleaching uses the clorox consumption to be 0.5g/l, 18 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 1.9 of residual chlorine dose in the slurry, and add 1% hydrochloric acid again, 0.8% oxalic acid, 0.6% calgon carried out acid treatment 30 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 0.8%;
Desanding pressure: 0.2Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 1.2%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 8
Cotton linter and bleaching needlebush paper pulp are as not floating compound slurry
Cotton linter accounts for 85% in selected cotton, the wooden compound pulp, and wood pulps accounts for 15%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 3%%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 3, get into the chlorination tower, the chlorine consumption is 0.5%, time of chlorinating 1 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 70g/m
3
Get into Bellmer, steam is warming up to 50 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 70g/m
3, bleaching uses the clorox consumption to be 0.5g/l, 19 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 1.8 of residual chlorine dose in the slurry, and add 2% hydrochloric acid again, 1% oxalic acid, 0.5% calgon carried out acid treatment 50 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 1%;
Desanding pressure: 0.2Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 1.2%;
One squeeze pressure: 0.2Mpa;
Second press pressure: 0.3Mpa;
Three road squeeze pressure: 0.5Mpa;
Drying cylinder steam pressure: 0.3Mpa;
Cut paper specification: 600*800;
Metering specification: 100Kg/ bag.
Embodiment 9
Cotton linter and bleaching needlebush paper pulp are as not floating compound slurry
Cotton linter accounts for 95% in selected cotton, the wooden compound pulp, and wood pulps accounts for 5%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 4%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 2, get into the chlorination tower, the chlorine consumption is 1.5%, time of chlorinating 1.2 hours gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 75g/m
3
Get into Bellmer, steam is warming up to 55 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 60g/m
3, bleaching uses the clorox consumption to be 0.2g/l, 18 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 1.9 of residual chlorine dose in the slurry, and add 2% hydrochloric acid again, 0.8% oxalic acid, 0.6% calgon carried out acid treatment 30 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 0.8%;
Desanding pressure: 0.2Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 1.2%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 10
Cotton linter and true qualities needlebush paper pulp are as not floating compound slurry
Cotton linter accounts for 80% in selected cotton, the wooden compound pulp, and wood pulps accounts for 20%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 3.5%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 2.5, get into the chlorination tower, the chlorine consumption is 0.6%, time of chlorinating 1 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 75g/m
3
Get into Bellmer, steam is warming up to 45 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 65g/m
3, bleaching uses the clorox consumption to be 0.6g/l, 19 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 2 of residual chlorine dose in the slurry, and add 1.5% hydrochloric acid again, 0.6% oxalic acid, 0.8% calgon carried out acid treatment 35 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 1%;
Desanding pressure: 0.2Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 1.5%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.8Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 11
Cotton linter and bleaching leaf wood paper pulp are as not floating compound slurry
Cotton linter accounts for 86% in selected cotton, the wooden compound pulp, and wood pulps accounts for 14%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 4.5%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 1.5, get into the chlorination tower, the chlorine consumption is 1.5%, time of chlorinating 1.2 hours gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 65g/m
3
Get into Bellmer, steam is warming up to 60 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 70g/m
3, bleaching uses the clorox consumption to be 0.6g/l, 21 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 1.9 of residual chlorine dose in the slurry, and add 1.5% hydrochloric acid again, 1.2% oxalic acid, 0.8% calgon carried out acid treatment 40 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 1%;
Desanding pressure: 0.3Mpa manufactures paper with pulp;
The water of sizing mixing: clear water;
Online concentration: 1%;
One squeeze pressure: 0.2Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.12Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 12
Cotton linter and true qualities leaf wood paper pulp are as not floating compound slurry
Cotton linter accounts for 88% in selected cotton, the wooden compound pulp, and wood pulps accounts for 12%.
Compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness>=91%, viscosity≤13, irony≤30ppm.
Advance to starch concentration and be controlled at 4.5%, under the normal temperature, in preparatory sour pond, add hydrochloric acid by slurry weight percentage, to pH value be 2.5, get into the chlorination tower, the chlorine consumption is 1.2%, time of chlorinating 0.8 hour gets into the alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3
Get into Bellmer, steam is warming up to 45 ℃, stops to feed steam, add caustic soda and transfer alkali, to alkalinity be 70g/m
3, bleaching uses the clorox consumption to be 1.2g/l, 22 minutes times spent of bleaching, extraordinarily go into the hypo dechlorination by 1.8 of residual chlorine dose in the slurry, and add 1.5% hydrochloric acid again, 0.7% oxalic acid, 1.2% calgon carried out acid treatment 45 minutes.
Carry out washing procedure by conventional method.
The process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
The technological parameter of the described operation of manufacturing paper with pulp comprises:
The desanding concentration of manufacturing paper with pulp: 0.8%;
Desanding pressure: 0.2Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 1.2%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Claims (10)
1. the aftertreatment technology of a cotton, wooden compound pulp, comprising: chlorination-bleach-wash-manufacture paper with pulp is characterized in that: cotton linter accounts for 70-99% in selected cotton, the wooden compound pulp; Wood pulps accounts for 1-30%, and compound pulp has following parameter index: first fibre>=91%, the degree of polymerization≤1200; Ash content≤0.13%, whiteness>=91%, viscosity≤13; Irony≤30ppm, the concentration of advancing to starch of described aftertreatment technology is 3-5%, described chlorination is meant at normal temperatures; First acid treatment is regulated pH value to 1-3 in preparatory sour pond, sends into the chlorination tower again, and described bleaching temperature is 30-65 ℃.
2. the aftertreatment technology of a kind of cotton according to claim 1, wooden compound pulp; It is characterized in that: chlorine is pressed slurry oven dry weight adding 0.5-2% in the described chlorinating step; Time of chlorinating 0.5-1.5 hour, get into the alkalization pond, adding caustic soda to alkalinity is 10-200g/m
3
3. the aftertreatment technology of a kind of cotton according to claim 2, wooden compound pulp is characterized in that: described caustic soda to the alkalinity that adds is 60-80g/m
3
4. the aftertreatment technology of a kind of cotton according to claim 1, wooden compound pulp; It is characterized in that: described bleaching is meant that the compound pulp after the chloridized is sent into the Bellmer of transferring behind the alkali to carry out sodium hypochlorite bleaching 18-25 minute; After dechlorination, acid treatment; Promptly accomplish bleaching, technological parameter is following:
Transfer alkali number: 20-200g/m
3
Clorox consumption: 0.1-0.7g/l;
The hypo consumption: the 1.8-2 of residual chlorine doubly;
Acid treatment: hydrochloric acid consumption 1-3%,
Calgon consumption 0.5-1.5%,
Consumption of oxalic acid 0.5-1.5%.
5. the aftertreatment technology of a kind of cotton according to claim 4, wooden compound pulp is characterized in that: described accent alkali number is 60-80g/m
3
6. the aftertreatment technology of a kind of cotton according to claim 4, wooden compound pulp is characterized in that: the described acid-treated processing time is 30-60 minute.
7. the aftertreatment technology of a kind of cotton according to claim 1, wooden compound pulp is characterized in that: do not have washing step between described chlorination and the blanching step.
8. the aftertreatment technology of a kind of cotton according to claim 1, wooden compound pulp is characterized in that: the described process flow of manufacturing paper with pulp is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in.
9. the aftertreatment technology of a kind of cotton according to claim 8, wooden compound pulp is characterized in that: the technological parameter of the described operation of manufacturing paper with pulp comprises:
Desanding concentration: 0.6-1.5% manufactures paper with pulp;
Desanding pressure: 0.15-0.32Mpa manufactures paper with pulp;
The water of sizing mixing: clear water, plain boiled water;
Online concentration: 0.6-1.5%;
One squeeze pressure: 0.1-0.3Mpa;
Second press pressure: 0.2-0.5Mpa;
Three road squeeze pressure: 0.3-0.7Mpa;
Drying cylinder steam pressure: 0.15-0.35Mpa;
Cut paper specification: 600*800;
Metering specification: 100-250Kg/ bag.
10. according to the aftertreatment technology of each described a kind of cotton, wooden compound pulp in the claim 1-9, it is characterized in that: cotton linter accounts for 85-95% in described cotton, the wooden compound pulp, and wood pulps accounts for 5-15%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643369A (en) * | 2013-11-20 | 2014-03-19 | 苏州工业园区友顺制衣厂 | Manufacturing technology of ginkgo nut silk fabric |
| CN113123160A (en) * | 2021-04-29 | 2021-07-16 | 安徽雪龙纤维科技股份有限公司 | Cotton pulp bleaching process and cotton pulp bleaching equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844497A (en) * | 2006-05-08 | 2006-10-11 | 宜宾丝丽雅股份有限公司 | Cotton and wood composite cellulose pulp and method for producing same |
| KR20090068891A (en) * | 2007-12-24 | 2009-06-29 | 임태용 | Apparatus for extracting pulp of rhodophyta |
| CN102383332A (en) * | 2011-10-24 | 2012-03-21 | 安徽雪龙纤维科技股份有限公司 | Cotton pulp with high degree of polymerization and production method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844497A (en) * | 2006-05-08 | 2006-10-11 | 宜宾丝丽雅股份有限公司 | Cotton and wood composite cellulose pulp and method for producing same |
| KR20090068891A (en) * | 2007-12-24 | 2009-06-29 | 임태용 | Apparatus for extracting pulp of rhodophyta |
| CN102383332A (en) * | 2011-10-24 | 2012-03-21 | 安徽雪龙纤维科技股份有限公司 | Cotton pulp with high degree of polymerization and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643369A (en) * | 2013-11-20 | 2014-03-19 | 苏州工业园区友顺制衣厂 | Manufacturing technology of ginkgo nut silk fabric |
| CN113123160A (en) * | 2021-04-29 | 2021-07-16 | 安徽雪龙纤维科技股份有限公司 | Cotton pulp bleaching process and cotton pulp bleaching equipment |
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