CN102691228B - Post-processing process of cotton-wood composite pulp - Google Patents
Post-processing process of cotton-wood composite pulp Download PDFInfo
- Publication number
- CN102691228B CN102691228B CN201210170722.2A CN201210170722A CN102691228B CN 102691228 B CN102691228 B CN 102691228B CN 201210170722 A CN201210170722 A CN 201210170722A CN 102691228 B CN102691228 B CN 102691228B
- Authority
- CN
- China
- Prior art keywords
- pulp
- cotton
- bleaching
- paper
- wood
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Paper (AREA)
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 cellulose viscose pulp production technology, is specially adapted to the chlorination of the compound pulp of Cotton Pulp and wood pulps-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.
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 CN200610020971.8(name is called " cotton, wood 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 being produced by cotton, wooden mixing, can effectively advantage cotton, wood fiber 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, formerly adopting in the aftertreatment technology of patent CN200610020971.8 is unsuitable for the bleaching of cotton, wooden 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, wooden compound pulp, the present invention is directed to the characteristic of cotton, wooden compound pulp itself, propose the aftertreatment technology that a kind of compound pulp of usining cotton linter and wood pulps 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 and wood pulps as not bleaching raw material, and technical process comprises: chlorination-bleaching-washing-manufacturing paper with pulp.
The aftertreatment technology of a kind of cotton, wooden compound pulp, comprise: chlorination-bleaching-washing-manufacturing paper with pulp, it is characterized in that: in selected cotton, wooden compound pulp, cotton linter accounts for 70-99%, 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 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, protects first fine 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.
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, wooden compound pulp, cotton linter accounts for 85-95%, and wood pulps accounts for 5-15%.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.
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, as the raw material of compound pulp, can be natural color pulp, can be also bleached pulp.
The viscose not floating after cotton, wooden 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 cotton, wooden compound pulp aftertreatment technology 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 and wood pulps is raw material, has brought into play the excellent properties of two kinds of fibers, and cotton linter is combined with the excellent properties of wood pulps, has 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, wooden compound pulp aftertreatment technology targetedly, by the raw-material process optimization in certain indication range, the process conditions of optimizing have been obtained, therefore, the efficiency of producing is higher, the product quality obtaining is more stable, is specially adapted to the aftertreatment technology of cotton, wooden 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) owing to having controlled cotton linter in cotton, wooden compound pulp, account for 85-95%, 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 described in further detail:
Embodiment 1
Cotton linter and true qualities leaf wood paper pulp are as not floating compound slurry
In selected cotton, wooden compound pulp, cotton linter accounts for 99%, 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.
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: 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
In selected cotton, wooden compound pulp, cotton linter accounts for 85%, 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.
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 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: 0.3Mpa 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
In selected cotton, wooden compound pulp, cotton linter accounts for 80%, 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.
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 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: 0.32Mpa 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
In selected cotton, wooden compound pulp, cotton linter accounts for 70%, 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.
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 and true qualities needlebush paper pulp are as not floating compound slurry
In selected cotton, wooden compound pulp, cotton linter accounts for 95%, 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.
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 and true qualities needlebush paper pulp are as not floating compound slurry
In selected cotton, wooden compound pulp, cotton linter accounts for 90%, 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.
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 and bleaching needlebush paper pulp are as the raw material of compound pulp
In selected cotton, wooden compound pulp, cotton linter accounts for 99%, and wood pulps accounts for 1%.
The preparation technology of the compound pulp of cotton linter and bleaching needlebush paper pulp comprises following processing step:
The first step: procedure for preparation
A, raw material are prepared
According to cotton linter and bleaching needlebush paper pulp gross weight, be 100～250kg:1m with the ratio of boiling vessel volume
3get the raw materials ready, choose cotton linter and bleaching needlebush paper pulp; According to aforementioned proportion, get the raw materials ready, make the density in boiling vessel moderate;
B, dispersion and pulping
Cotton linter is become to pulp board with bleaching needlebush paper pulp dispersion treatment, then cotton linter and bleaching needlebush paper pulp are mixed with sodium hydroxide solution, carry out pulping processing, the mixture that obtains cotton linter, bleaching needlebush paper 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 to fiber over dry gross weight and cotton linter and the percentage of bleaching mixture (the starching congee) weight of needlebush paper pulp and sodium hydroxide solution in cotton linter and bleaching needlebush paper pulp.
In cotton linter and bleaching needlebush paper pulp are mixed with sodium hydroxide solution described in step B, carrying out pulping processes and to refer to cotton linter and bleaching needlebush paper 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 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 and bleaching needlebush paper pulp are as not floating compound slurry
In selected cotton, wooden compound pulp, cotton linter accounts for 85%, 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.
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 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: 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
In selected cotton, wooden compound pulp, cotton linter accounts for 95%, 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.
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 and true qualities needlebush paper pulp are as not floating compound slurry
In selected cotton, wooden compound pulp, cotton linter accounts for 80%, 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.
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 and bleaching leaf wood paper pulp are as not floating compound slurry
In selected cotton, wooden compound pulp, cotton linter accounts for 86%, 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.
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 and true qualities leaf wood paper pulp are as not floating compound slurry
In selected cotton, wooden compound pulp, cotton linter accounts for 88%, 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.
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 (9)
1. a cotton, the aftertreatment technology of wood compound pulp, comprise: chlorination-bleaching-washing-manufacturing paper with pulp, it is characterized in that: selected cotton, in wood compound pulp, cotton linter accounts for 70-99%, 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 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 ℃,
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, wooden compound pulp, it is characterized in that: in described chlorinating step, chlorine adds 0.5-2% by slurry oven dry weight, time of chlorinating 0.5-1.5 hour, enters alkalization pond, and 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, is characterized in that: described tune alkali number is 60-80g/m
3.
5. the aftertreatment technology of a kind of cotton according to claim 1, wooden compound pulp, is characterized in that: the described acid-treated processing time is 30-60 minute.
6. the aftertreatment technology of a kind of cotton according to claim 1, wooden compound pulp, is characterized in that: between described chlorination and blanching step, there is no washing step.
7. 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.
8. the aftertreatment technology of a kind of cotton according to claim 7, 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.
9. according to a kind of cotton described in any one in claim 1-8, the aftertreatment technology of wooden compound pulp, it is characterized in that: in described cotton, wooden compound pulp, cotton linter accounts for 85-95%, and wood pulps accounts for 5-15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210170722.2A CN102691228B (en) | 2012-05-29 | 2012-05-29 | Post-processing process of cotton-wood composite pulp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210170722.2A CN102691228B (en) | 2012-05-29 | 2012-05-29 | Post-processing process of cotton-wood composite pulp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102691228A CN102691228A (en) | 2012-09-26 |
| CN102691228B true CN102691228B (en) | 2014-04-02 |
Family
ID=46856955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210170722.2A Expired - Fee Related CN102691228B (en) | 2012-05-29 | 2012-05-29 | Post-processing process of cotton-wood composite pulp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102691228B (en) |
Families Citing this family (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 (2)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100965310B1 (en) * | 2007-12-24 | 2010-06-22 | 임태용 | Red algae pulp extractor |
-
2012
- 2012-05-29 CN CN201210170722.2A patent/CN102691228B/en not_active Expired - Fee Related
Patent Citations (2)
| 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102691228A (en) | 2012-09-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101449942B (en) | Natural color sanitary paper and preparation method thereof | |
| CN102182090B (en) | Composite pulp of paper pulp and cotton linter and preparation method thereof | |
| CN100395403C (en) | Oxygen delignify treating method for grass group unbleached chemical pulp | |
| CN100355955C (en) | Cotton-wood-bamboo composite cellulose pulp and method for producing same | |
| CN102677529B (en) | Posttreatment process of cotton, wood and bamboo compound pulp | |
| CN100355954C (en) | Cotton and bamboo composite cellulose pulp and method for producing same | |
| CN100449039C (en) | Cotton and wood composite cellulose pulp and method for producing same | |
| CN102691228B (en) | Post-processing process of cotton-wood composite pulp | |
| CN102677531B (en) | Post-treatment process of cotton-bamboo composite pulp | |
| CN102677505B (en) | Steaming process for modifying bleaching bamboo paper pulp and bleaching wood paper pulp into dissolving pulp in compound way | |
| CN102677500B (en) | A kind of material preparation technology being applicable to pulp by modifying true color unbleached and preparing dissolving pulp | |
| CN101148834B (en) | Paper-making-stage broad-leaved wood pulp plate denaturalization producing technique | |
| CN100355958C (en) | Wood and bamboo composite cellulose pulp and method for producing same | |
| CN102704317B (en) | Post-processing technology for wood-bamboo composite pulp | |
| CN102677509B (en) | Material preparation process for preparing dissolving pulp by modifying bleached needle leave wood and broadleaf wood composite pulp | |
| CN102691221B (en) | Material preparation technology applied in preparation of dissolving pulp by modifying bleached wood pulp | |
| CN102677495B (en) | Material preparation process suitable for preparing dissolving pulp by modifying bleached bamboo paper pulp | |
| CN102677507B (en) | Cooking process for carrying out composite modification on natural color bamboo paper pulp and cotton paper pulp to form dissolving pulp | |
| CN100355959C (en) | Cotton and hemp composite cellulose pulp and method for producing same | |
| CN101148832B (en) | Paper-making-stage high viscosity wood pulp plate denaturalization producing technique | |
| CN102747638A (en) | Production technology for high-wet modulus cotton pulp | |
| CN101451312B (en) | Method for preparing bleached chemical pulp by using grass type plants as raw materials | |
| CN102677501B (en) | Material preparation process suitable for preparing dissolving pulp by modifying natural color unblenched needlebush and broadleaf wood composite paper pulp | |
| CN102677496B (en) | Material preparation process for preparing dissolving pulp by modifying bleached bamboo-wood composite pulp | |
| CN100355957C (en) | Cotton wood hemp composite cellulose pulp and mfg. process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: YIBIN GRACE GROUP COMPANY Free format text: FORMER OWNER: YIBIN CHANGYI POMACE CO., LTD. Effective date: 20130523 Free format text: FORMER OWNER: YIBIN GRACE GROUP COMPANY Effective date: 20130523 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130523 Address after: 644002 space Road, Nan'an economic and Technological Development Zone, Yibin, Sichuan Applicant after: Yibin Grace Group Company Address before: 644002 Yibin, South Bank of the middle of the road, the space shuttle Applicant before: Yibin Changyi Pomace Co., Ltd. Applicant before: Yibin Grace Group Company |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20190529 |