CN102677529B - Posttreatment process of cotton, wood and bamboo compound pulp - Google Patents
Posttreatment process of cotton, wood and bamboo compound pulp Download PDFInfo
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Abstract
Aiming at the self characteristics of wool, wood and bamboo compound pulp, the invention provides a posttreatment process which is used for manufacturing viscose fibre pulp from compound pulp of cotton linter, wood pulp and bamboo pulp used as a raw material. The posttreatment process comprises the process steps of: chlorination, bleaching, washing and manufacturing. The cotton linter, the wood pulp and the bamboo pulp selected by the posttreatment process provided by the invention can be compounded according to any proportion; and the compound pulp has the following parameter indexes that methyl fibre is greater than or equal to 91%, the polymerization degree is less than or equal to 1200, the ash is less than or equal to 0.13%, the whiteness is greater than or equal to 91%, the viscosity is less than or equal to 13, and the iron matter is less than or equal to 30 ppm. The pulp inlet concentration of the treating process provided by the invention is 3%-5%, the pulp is subjected to acid treatment in a pre-acid pool to adjust the pH value to 1-3 at room temperature, the pulp is then fed into a chlorination tower, and the bleaching temperature is 30-65 DEG C. The whole technological process is simple in equipment and operation, convenient for 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 cellulose viscose pulp production technology, is specially adapted to the chlorination of the compound pulp of Cotton Pulp, wood pulps and bamboo pulp-bleach-wash-the aftertreatment technology technical field of manufacturing paper with pulp.
Background technology
Viscose is the conventional chemical fibre of a class, and the technological process of its production is as follows: slurrying → prepare spinning solution → spinning → post processing → finished product, wherein, what by slurrying, obtain is viscose glue pulp.Traditional viscose glue pulp is that to take timber and cotton linter etc. be raw material, by raw material is carried out to selection, get the raw materials ready, Physical Processing or Chemical Pretreatment, boiling, bleaching, acid treatment, wash and a series of operation such as manufacture paper with pulp is prepared from.In recent years, also have the raw materials such as bamboo wood and fiber crops are carried out to the production method that above-mentioned sequence of operations carrys out Making viscose pulp.
Development along with China's viscose industry, domestic enterprise is the raw materials for production as viscose mainly with Cotton Pulp, the resource of raw material cotton linter be subject to cultivated area and growth cycle restriction and day by day shortage, but be subject to the impact of domestic cultivated area, growth cycle and the ecological balance, seriously restricted the development of China's viscose industry.Existing enterprise attempts usining bamboo pulp and wood pulps as the raw materials for production of viscose for this reason, and obtained initial success, if the patent No. is that CN02112175.3(name is called " bamboo pulp denatured productive technology ") patent of invention a kind of production technology of bamboo pulp is disclosed; some patent discloses respectively a kind of production technology of wood pulps, comprise that the patent No. is that CN200610021387.4(name is called " Wood pomace modified producing technology "), the patent No. is that CN200710050465.8(name is called " paper-making-stage high viscosity wood pulp plate denaturalization producing technique "), the patent No. is that CN200710050466.2(name is called " paper-making-stage reclaiming wood pulp plate denaturalization producing technique "), the patent No. is that CN200710050467.7(name is called " paper-making-stage broad-leaved wood pulp plate denaturalization producing technique "), the patent No. is CN200710050469.6(" name is called modified production process of paper making level sulphate wood pulp plate "), the patent No. is that CN200710050470.9(name is called " paper-making grade softwood pulp plate modifying production technique "), the patent No. is that CN200710050471.3(name is called " paper-making-stage wood pulp plate denaturalization producing technique "), the patent No. is that CN200710050472.8(name is called " paper-making-stage bamboo wood pulp plate denaturalization producing technique "), the patent No. is that CN200710050473.2(name is called " paper-making-stage primary color wood pulp plate denaturalization producing technique ") etc.
Along with scientific and technical development and the raising of living standards of the people, there is very large transformation in people's consumption idea and concept of health, consumer is also more and more higher to the requirement of textile product, aspect dress, not only require beautiful and comfortable, exquisite individual character fashion, and can be antibacterial, antibacterial, be easy to nursing, health environment-friendly.
The viscose that the raw materials such as cotton, wood, bamboo, fiber crops are produced respectively has feature, and the viscose performance of only producing with a kind of pulp is dull, two kinds and above pulp are carried out to the excellent properties that compound Making viscose fiber pulp can be brought into play various fibers, maximize favourable factors and minimize unfavourable ones, make up each other, the premium properties of every kind of fiber is represented.
Cotton linter because content of cellulose is high, technical maturity, cotton planting amount be large, although cotton linter price one tunnel was high in recent years, is still at present the main raw material of producing viscose.Formerly the patent No. is that CN200610020978.X(name is called " cotton, wood, bamboo composite cellulose pulp and manufacture method thereof ") patent of invention the new approaches of New Viscose Fibre pulp and production thereof have been proposed, disclose a kind of novel pulp of composite fibre and manufacturing technique thereof of mixing production by cotton, wood, bamboo, can effectively the advantage of cotton, wood, bamboo fibre raw material have been put together.Yet, according to different raw materials for production and different sex change production processes, there is different production requirements, carrying out when sex change is produced providing pointedly bleaching process.If the patent No. is that CN200810147984.0(name is called " for the preparation of method for bleaching and the application thereof of bamboo chemical dissolving pulp ") patent of invention, for present situation and bamboo wood feature cotton, wooden dissolving pulp, a kind of method for bleaching for the preparation of bamboo chemical dissolving pulp has been proposed.
Therefore the method for bleaching that, formerly the aftertreatment technology of patent CN200610020978.X adopts is unsuitable for the bleaching of cotton, wood, bamboo compound pulp.
Summary of the invention
The product lack of homogeneity of producing in order to overcome existing cotton linter, be subject to the quantitative limitation of cotton linter matter, be difficult to large-scale production and existing bleaching process and be unsuitable for the problem of the bleaching of cotton, wood, bamboo compound pulp, the present invention is directed to the own characteristic of cotton, wood, bamboo compound pulp, propose the aftertreatment technology that a kind of compound pulp of usining cotton linter, the wooden oar dregs of rice and bamboo pulp is produced for cellulose viscose pulp as raw material.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, wood pulps and bamboo pulp as not bleaching raw material, and technical process comprises: chlorination-bleaching-washing-manufacturing paper with pulp.
The aftertreatment technology of a kind of cotton, wood, bamboo compound pulp, comprise: bleach-wash-manufacture paper with pulp, it is characterized in that: in selected selected cotton, wood, bamboo compound pulp, cotton linter, wood pulps and bamboo pulp can be compound in any proportion, 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 refers to: at normal temperatures, in pre-sour pond, first acid treatment regulates pH value to 1-3, sends into chlorination tower, and chlorine adds 0.5-2% by slurry oven dry weight, and time of chlorinating 0.5-1.5 hour enters alkalization pond, and adding caustic soda to alkalinity is 10-200g/m
3;
In described pre-sour pond, acid treatment regulates pH value to 1-3, and it is bleached at the very start under chlorine molecular state, avoids neutral bleaching, and protection first is fine.
Preferably, described caustic soda to the alkalinity that adds is 60-80g/l, can effectively shorten bleaching time, and it is poly-easy to fall, and whiteness is high.
Described bleaching refers to: the compound pulp after chlorination is processed is sent into the Bellmer of adjusting after alkali and carried out sodium hypochlorite bleaching, after dechlorination, acid treatment, completes bleaching.Described tune alkali number is 20-200g/m
3; Described clorox consumption 0.1-0.7g/l; The 1.8-2 that in described dechlorination process, hypo consumption is residual chlorine doubly.The reagent that described acid treatment is used and be by the consumption of slurry oven dry weight: hydrochloric acid consumption 1-3%, calgon consumption 0.5-1.5%, consumption of oxalic acid 0.5-1.5%.
In acid treatment, adopt three kinds of reagent to share and contribute to shorten flow process, saved the washing link between chlorination and bleaching, saved water source, can effectively remove residual chlorine and gray iron simultaneously.
Preferably, described caustic soda to the alkalinity that adds is 60-80g/l, can effectively shorten bleaching time, and it is poly-easy to fall, and whiteness is high.
It is 3-5% that described aftertreatment technology enters to starch concentration, can effectively improve uniformity, makes to bleach product and is dissolved in the water, and by washing, removes.
Described bleaching temperature is 30-65 ℃, and the object of intensification is in order to improve reaction speed and osmotic effect.
The described sodium hypochlorite bleaching time is 18-25 minute, can improve better whiteness.
The described acid-treated processing time is 30-60 minute, and hydrochloric acid is fully reacted with grey iron substance.
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, in described cotton, wood, bamboo compound pulp, cotton linter accounts for 1-30%, and wood pulps and bamboo pulp account for 70-99%, and finished product pulp shaping evenness is good, and intensity is high, and first fibre is high, and yield is high, and ash content is low, and reactivity worth is good.
In described cotton, wood, bamboo compound pulp, wood pulps can be needlebush paper pulp, leaf wood paper pulp.
Described wood pulps and bamboo pulp, as the raw material of compound pulp, can be natural color pulp, can be also bleached pulp.
The viscose not floating after cotton, wood, bamboo compound pulp raw material and bleaching of the present invention's use is compared with pulp, and its quality index is:
| Index | Before bleaching | After 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 is optimized the aftertreatment technology of cotton, wood, bamboo compound pulp targetedly, and the process conditions of optimizing are provided, and the fiber pulp quality of production can meet the production requirement of viscose completely.By the optimization to aftertreatment technology parameter system, the product of producing has the advantages that first fiber content is high, whiteness is high, gray iron is low, reactivity worth is good.Concrete beneficial effect is as follows:
(1) what use due to the present invention is that the compound pulp of cotton linter, wood pulps and bamboo pulp is raw material, brought into play the excellent properties of three kinds of fibers, the excellent properties of cotton linter, wood pulps and bamboo pulp is combined, overcome the shortcoming of the product lack of homogeneity of existing cotton linter production.
(2) due to the whole process process equipment of the present invention, simple to operate, and prove by test of many times, the kind of paper pulp used is not subject to the restriction of production method and raw material, can be natural color pulp, can be bleached pulp yet, easy to use, be easy to realize.
(3) because the present invention is optimized cotton, wood, bamboo compound pulp aftertreatment technology targetedly, by the raw-material process optimization in certain indication range, obtained specific aim more by force, the process conditions more optimized, therefore, the efficiency of producing is higher, the product quality obtaining is more stable, is specially adapted to the aftertreatment technology of cotton, wood, bamboo compound pulp.
(4) because acid treatment in pre-sour pond regulates pH value to 1-3, pulp is bleached at the very start under chlorine molecular state, avoided neutral bleaching, protect first fine simultaneously, make the pulp methyl fiber dimension hplc after bleaching high.
(5) because bleaching temperature is controlled at 30-65 ℃, effectively improved reaction speed and the osmotic effect of bleaching, the product whiteness after bleaching is improved.
(6) aftertreatment technology cotton, wooden owing to having controlled, bamboo compound pulp, is characterized in that: in described cotton, wood, bamboo compound pulp, cotton linter accounts for 1-30%, and wood pulps and bamboo pulp account for 70-99%, and guaranteed that the grey iron content of product is low, reactivity worth is good.
The specific embodiment
Below in conjunction with several preferred embodiments, the present invention is described in further detail:
Embodiment 1
Cotton linter, true qualities leaf wood paper pulp and true qualities bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 30%, and wood pulps accounts for 40%, and bamboo pulp 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.
Enter to starch concentration and be controlled at 3% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 3, enter chlorination tower, chlorine consumption is 0.6%, time of chlorinating 0.5 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3;
Enter Bellmer, steam is warming up to 65 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 100g/m
3, bleaching is 0.6g/l with clorox consumption, 20 minutes used times of bleaching, adds hypo dechlorination, then add 3% hydrochloric acid, 1.5% oxalic acid, 1.5% calgon to carry out acid treatment 60 minutes by 2 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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: plain boiled 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, true qualities leaf wood paper pulp and bleaching bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 1%, and wood pulps accounts for 60%, and bamboo pulp accounts for 39%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 5% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 3, enter chlorination tower, chlorine consumption is 2%, time of chlorinating 0.5 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 60g/m
3;
Enter Bellmer, steam is warming up to 3 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 50g/m
3, bleaching is 0.7g/l with clorox consumption, 18 minutes used times of bleaching, adds hypo dechlorination, then add 1% hydrochloric acid, 0.5% oxalic acid, 1% calgon to carry out acid treatment 30 minutes by 1.8 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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: plain boiled 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, bleaching leaf wood paper pulp and true qualities bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 20%, and wood pulps accounts for 30%, and bamboo pulp accounts for 50%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 3% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 2, enter chlorination tower, chlorine consumption is 0.5%, time of chlorinating 1.5 hours, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3;
Enter Bellmer, steam is warming up to 30 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 80g/m
3, bleaching is 0.1g/l with clorox consumption, 20 minutes used times of bleaching, adds hypo dechlorination, then add 1% hydrochloric acid, 1.5% oxalic acid, 1.5% calgon to carry out acid treatment 40 minutes by 2 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, bleaching leaf wood paper pulp and bleaching bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 10%, and wood pulps accounts for 50%, and bamboo pulp accounts for 40%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 3% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 1, enter chlorination tower, chlorine consumption is 1.5%, time of chlorinating 0.5 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 10g/m
3;
Enter Bellmer, steam is warming up to 35 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 20g/m
3, bleaching is 0.5g/l with clorox consumption, 25 minutes used times of bleaching, adds hypo dechlorination, then add 1% hydrochloric acid, 0.5% oxalic acid, 1.5% calgon to carry out acid treatment 40 minutes by 1.9 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, true qualities needlebush paper pulp and true qualities bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 15%, and wood pulps accounts for 60%, and bamboo pulp accounts for 25%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 4% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 3, enter chlorination tower, chlorine consumption is 0.5%, time of chlorinating 1.5 hours, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 60g/m
3;
Enter Bellmer, steam is warming up to 60 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 100g/m
3, bleaching is 0.1g/l with clorox consumption, 20 minutes used times of bleaching, adds hypo dechlorination, then add 3% hydrochloric acid, 0.5% oxalic acid, 1% calgon to carry out acid treatment 60 minutes by 2 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, true qualities needlebush paper pulp and bleaching bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 30%, and wood pulps accounts for 15%, and bamboo pulp accounts for 55%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 5% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 2, enter chlorination tower, chlorine consumption is 2%, time of chlorinating 0.8 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 150g/m
3;
Enter Bellmer, steam is warming up to 65 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 150g/m
3, bleaching is 0.1g/l with clorox consumption, 22 minutes used times of bleaching, adds hypo dechlorination, then add 1% hydrochloric acid, 0.5% oxalic acid, 0.5% calgon to carry out acid treatment 60 minutes by 2 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, bleaching needlebush paper pulp and true qualities bamboo pulp are as the raw material of compound pulp
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 10%, and wood pulps accounts for 50%, and bamboo pulp accounts for 40%.
The preparation technology of the compound pulp of cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp comprises following processing step:
The first step: procedure for preparation
A, raw material are prepared
According to cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp gross weight, be 100～250kg:1m with the ratio of boiling vessel volume
3get the raw materials ready, choose cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp; According to aforementioned proportion, get the raw materials ready, make the density in boiling vessel moderate;
B, dispersion and pulping
Cotton linter, bleaching needlebush paper pulp are become to pulp board with true qualities bamboo pulp dispersion treatment, then cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp are mixed with sodium hydroxide solution, carry out pulping processing, the mixture that obtains cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp and sodium hydroxide solution starches congee, carry out next step impregnation process, the slurry concentration of the described slurry congee that processing obtains through pulping is 3～5% again;
The liquor ratio of the concentration of the above-mentioned sodium hydroxide solution adding in final step F is 1:3～4, sodium hydrate solid weight is 17～22% controls with the percentage of starching fiber over dry gross weight in congee, in step C, D and E, sodium hydroxide solution may lose, in step F, can add sodium hydroxide solution, making liquor ratio is 1:3～4, and sodium hydrate solid weight is 17～22% with the percentage of starching fiber over dry gross weight in 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 paging cutter raw material is divided into pulp board one by one, finally uses the belt conveyor of feeding dregs of rice machine to carry pulp board to hydrabrusher;
Slurry concentration is this area technical term, refers in cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp fiber over dry gross weight with cotton linter and bleaches the percentage of mixture (the starching congee) weight of needlebush paper pulp and sodium hydroxide solution.
In cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp are mixed with sodium hydroxide solution described in step B, carrying out pulping processes and to refer to cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp are delivered to hydrabrusher with the transporting velocity of 85～200kg/min, add sodium hydroxide solution to carry out pulping processing, and the discharging speed after pulping processing is 2.8～6m simultaneously
3/ min.
The electric machine frequency of above-mentioned hydrabrusher is 15～30Hz.
C, dipping
Slurry congee through disperseing pulping to obtain is carried out to impregnation process;
In the time of the dipping described in step C, be 1～20 minute, dipping temperature is 10～40 ℃, and after dipping, slurry concentration is 2～5%.
D, the de-liquid of squeezing
Slurry congee through dipping is squeezed to de-liquid, and the de-liquid of squeezing is 20～35% to starching congee mass dryness fraction;
Mass dryness fraction is this area technical term, refers to the percentage of mixture (the starching congee) weight of liquid weight and cotton linter, bleaching needlebush paper pulp and true qualities bamboo pulp and sodium hydroxide solution.
At the pressure of the de-liquid of the squeezing described in step D, controlling is 0.4～0.5MPa.
At the slurry congee alkalinity through the de-liquid of squeezing described in step D, be 3.0～5.1%, methylcellulose content is 20～25%.
E, pulverizing
Slurry congee through the de-liquid of squeezing is ground into cotton-shaped or single fiber;
In the pulverizing described in step e, in being sent into pulverizer with the speed of 85～200kg/min, pulverizes in the slurry congee that takes off liquid through squeezing.
Second step: cooking process
The slurry congee that is ground into cotton-shaped or single fiber is sent into continuous steamer and carry out boiling.
When continuously cooking, by T shape pipe, in continuous steamer, add alkali lye, alkali lye is selected NaOH and Na
2sO
3mixture, its mixed proportion is: NaOH:Na
2sO
3=90%:10%, adds by 17% of oven dry weight, liquor ratio: 1:2.0, and the vapor (steam) temperature of a section being connected with pre-reaction feed bin of steam pipe is 100 ℃, the vapor (steam) temperature of middle a section is 135 ℃, 145 ℃ of the vapor (steam) temperatures of a section being connected with cold spraying device; Compression ratio: 1:2.
The 3rd step: washing procedure
Adopt multistage counter current washing process, its technical process is:
A adds black liquor from the thick slurry of boiling in spraying pot, makes the concentration of high underflow be reduced to 2.4%, then adds washing assisant Busperse 2838, and consumption is 0.6 kg/tonne of slurry, mixes 12 minutes, by carrying stock pump, gets, and enters I section wash engine;
The black liquor that B is provided by II section black liquor slot carries out spray washing, and the black liquor after washing enters I section black liquor slot, and I section black liquor slot black liquor temperature is 70 ℃;
C starches subsequently and enters II section wash engine, by the washing reuse plain boiled water of III section black liquor slot, carries out spray washing, and the cleaning solution after washing enters II section filtrate tank and provides washings for the preceding paragraph pulp grinder;
The last slurry of D enters III section wash engine, by the cleaning solution adding, carries out spray washing, and the cleaning solution after washing enters III section filtrate tank, and the slurry after washing enters slurry tower.
Described I section wash engine adopts spiral mesh-belt pulp dresser, and technological parameter is:
Enter 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:
Enter to starch concentration 6%
Pulp concentration 12%
Turn/min of the speed of a motor vehicle 9
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:
Enter to starch concentration 5%
Pulp concentration 12%
Turn/min of the speed of a motor vehicle 4
Temperature normal temperature
Pulp pH value 6
The residual alkali number of wash degree is controlled at below 0.05g/L
Clean pressure 0.04Mpa
Wash time 60min/ criticizes
The 4th step: postprocessing working procedures
Compound pulp after boiling and washing procedure has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 4% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 1, enter chlorination tower, chlorine consumption is 1.5%, time of chlorinating 1 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3;
Enter Bellmer, steam is warming up to 35 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 60g/m
3, bleaching is 0.5g/l with clorox consumption, 18 minutes used times of bleaching, adds hypo dechlorination, then add 1% hydrochloric acid, 0.8% oxalic acid, 0.6% calgon to carry out acid treatment 30 minutes by 1.9 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, bleaching needlebush paper pulp and bleaching bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 25%, and wood pulps accounts for 40%, and bamboo pulp accounts for 35%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 3% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 3, enter chlorination tower, chlorine consumption is 0.5%, time of chlorinating 1 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 70g/m
3;
Enter Bellmer, steam is warming up to 50 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 70g/m
3, bleaching is 0.5g/l with clorox consumption, 19 minutes used times of bleaching, adds hypo dechlorination, then add 2% hydrochloric acid, 1% oxalic acid, 0.5% calgon to carry out acid treatment 50 minutes by 2 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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: clear 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, bleaching needlebush paper pulp and true qualities bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 15%, and wood pulps accounts for 40%, and bamboo pulp accounts for 45%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 4% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 2, enter chlorination tower, chlorine consumption is 1.5%, time of chlorinating 1.2 hours, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 75g/m
3;
Enter Bellmer, steam is warming up to 55 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 60g/m
3, bleaching is 0.2g/l with clorox consumption, 18 minutes used times of bleaching, adds hypo dechlorination, then add 2% hydrochloric acid, 0.8% oxalic acid, 0.6% calgon to carry out acid treatment 30 minutes by 1.9 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, true qualities needlebush paper pulp and bleaching bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 28%, and wood pulps accounts for 10%, and bamboo pulp accounts for 62%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 3.5% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 2.5, enter chlorination tower, chlorine consumption is 0.6%, time of chlorinating 1 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 75g/m
3;
Enter Bellmer, steam is warming up to 45 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 65g/m
3, bleaching is 0.6g/l with clorox consumption, 19 minutes used times of bleaching, adds hypo dechlorination, then add 1.5% hydrochloric acid, 0.6% oxalic acid, 0.8% calgon to carry out acid treatment 35 minutes by 2 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, true qualities needlebush paper pulp and true qualities bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 10%, and wood pulps accounts for 35%, and bamboo pulp accounts for 55%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 4.5% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 1.5, enter chlorination tower, chlorine consumption is 1.5%, time of chlorinating 1.2 hours, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 65g/m
3;
Enter Bellmer, steam is warming up to 60 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 70g/m
3, bleaching is 0.6g/l with clorox consumption, 21 minutes used times of bleaching, adds hypo dechlorination, then add 1.5% hydrochloric acid, 1.2% oxalic acid, 0.8% calgon to carry out acid treatment 40 minutes by 1.9 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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, true qualities needlebush paper pulp and bleaching bamboo pulp are as not floating compound slurry
In selected cotton, wood, bamboo compound pulp, cotton linter accounts for 5%, and wood pulps accounts for 25%, and bamboo pulp accounts for 70%.
Compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13, irony≤30ppm.
Enter to starch concentration and be controlled at 4.5% by slurry weight percentage, under normal temperature, in pre-sour pond, add hydrochloric acid, to pH value be 2.5, enter chlorination tower, chlorine consumption is 1.2%, time of chlorinating 0.8 hour, enter alkalization pond, adding caustic soda to alkalinity is that slurry volume compares 80g/m
3;
Enter Bellmer, steam is warming up to 45 ℃, stops passing into steam, adds caustic soda to adjust alkali, to alkalinity be 70g/m
3, bleaching is 1.2g/l with clorox consumption, 22 minutes used times of bleaching, adds hypo dechlorination, then add 1.5% hydrochloric acid, 0.7% oxalic acid, 1.2% calgon to carry out acid treatment 45 minutes by 1.8 times of residual chlorine dose in slurry.
Carry out according to a conventional method washing procedure.
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 (8)
1. a cotton, wood, the aftertreatment technology of bamboo compound pulp, comprise: chlorination-bleaching-washing-manufacturing paper with pulp, it is characterized in that: selected cotton, wood, cotton linter in bamboo compound pulp, wood pulps and bamboo pulp can be compound in any proportion, and compound pulp has following parameter index: first fibre >=91%, the degree of polymerization≤1200, ash content≤0.13%, whiteness >=91%, viscosity≤13mPas, irony≤30ppm, the concentration of entering to starch of described aftertreatment technology is 3-5%, described chlorination refers at normal temperatures, in pre-sour pond, first acid treatment regulates pH value to 1-3, send into again chlorination tower, described bleaching temperature is 30-65 ℃,
In described chlorinating step, chlorine adds 0.5-2% by slurry oven dry weight, and time of chlorinating 0.5-1.5 hour enters alkalization pond, and adding caustic soda to alkalinity is 10-200g/m
3;
Described bleaching refers to that the Bellmer that the compound pulp after chlorination is processed is sent into after tune alkali carries out sodium hypochlorite bleaching 18-25 minute, after dechlorination, acid treatment, completes bleaching, and technological parameter is as follows:
Adjust alkali number: 20-200g/m
3;
Clorox consumption: 0.1-0.7g/l;
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%.
2. the aftertreatment technology of a kind of cotton according to claim 1, wood, bamboo compound pulp, is characterized in that: described caustic soda to the alkalinity that adds is 60-80g/m
3.
3. the aftertreatment technology of a kind of cotton according to claim 1, wood, bamboo compound pulp, is characterized in that: described tune alkali number is 60-80g/m
3.
4. the aftertreatment technology of a kind of cotton according to claim 1, wood, bamboo compound pulp, is characterized in that: the described acid-treated processing time is 30-60 minute.
5. the aftertreatment technology of a kind of cotton according to claim 1, wood, bamboo compound pulp, is characterized in that: between described chlorination and blanching step, there is no washing step.
6. the aftertreatment technology of a kind of cotton according to claim 1, wood, bamboo 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.
7. the aftertreatment technology of a kind of cotton according to claim 6, wood, bamboo 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.
8. according to the aftertreatment technology of a kind of cotton described in any one in claim 1-7, wood, bamboo compound pulp, it is characterized in that: in described cotton, wood, bamboo compound pulp, cotton linter accounts for 1-30%, and wood pulps and bamboo pulp account for 70-99%.
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| CN106087088B (en) * | 2016-06-15 | 2019-03-08 | 唐山三友集团兴达化纤有限公司 | The preparation method of regenerated celulose fibre |
| EP3748071A1 (en) | 2019-06-04 | 2020-12-09 | Lenzing Aktiengesellschaft | Joint processing of lignocellulose raw material and cellulose-containing lignine-free product |
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| CN1865548A (en) * | 2006-05-08 | 2006-11-22 | 宜宾丝丽雅股份有限公司 | Cotton and bamboo composite cellulose pulp and method for producing same |
| CN1865549A (en) * | 2006-05-08 | 2006-11-22 | 宜宾丝丽雅股份有限公司 | Cotton-wood-bamboo composite cellulose pulp and method for producing same |
| CN101148836A (en) * | 2007-11-12 | 2008-03-26 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage bamboo wood pulp plate denaturalization producing technique |
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| CN102182090A (en) * | 2011-03-02 | 2011-09-14 | 山东海龙股份有限公司 | Composite pulp of paper pulp and cotton linter and preparation method thereof |
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| CN1865548A (en) * | 2006-05-08 | 2006-11-22 | 宜宾丝丽雅股份有限公司 | Cotton and bamboo composite cellulose pulp and method for producing same |
| CN1865549A (en) * | 2006-05-08 | 2006-11-22 | 宜宾丝丽雅股份有限公司 | Cotton-wood-bamboo composite cellulose pulp and method for producing same |
| CN101148836A (en) * | 2007-11-12 | 2008-03-26 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage bamboo wood pulp plate denaturalization producing technique |
| CN101435164A (en) * | 2007-11-12 | 2009-05-20 | 宜宾长毅浆粕有限责任公司 | Modified production process of paper making level sulphate wood pulp plate |
| CN102182090A (en) * | 2011-03-02 | 2011-09-14 | 山东海龙股份有限公司 | Composite pulp of paper pulp and cotton linter and preparation method thereof |
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