CN102704317B - Post-processing technology for wood-bamboo composite pulp - Google Patents
Post-processing technology for wood-bamboo composite pulp Download PDFInfo
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Abstract
The invention provides a post-processing technology for producing pulp for viscose fiber by using composite pulp of wood pulp and bamboo pulp as raw materials. The technology comprises the steps of bleaching, washing and papermaking. The wood pulp and the bamboo pulp in the wood-bamboo composite pulp selected by the post-processing technology disclosed by the invention can be composited in any proportion, and the composite pulp comprises the parameter indexes as follows: alpha cellulose equal to or greater than 91%, polymerization degree equal to or smaller than 1200, ash content equal to or smaller than 0.13%, white degree equal to or greater than 91%, viscosity equal to or smaller than 13, and iron equal to or smaller than 30ppm. The pulp inlet concentration ranges from 3 to 5% in the post-processing technology provided by the invention, and the bleaching temperature ranges from 30 to 60 DEG C. The post-processing technology has the advantages of easiness in operation of equipment in the whole technology process, convenience in use, high production efficiency and stable production 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 bleaching of the compound pulp of wood pulps and bamboo pulp-wash-manufacture paper with pulp aftertreatment technology technical field.
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 produces dissolving pulp for viscose glue for this reason, but the high fluctuation of the price of import dissolving pulp is large, has affected normal operation and the economic benefit of enterprise, finds the substitute of dissolving pulp, is a vital task of enterprise.
China's bamboo resource is abundant, in southern most areas, all has establishing in large scale.Bamboo dissolving pulp is except having cotton, chemistry that wooden dissolving pulp is similar or identical, physical property, the unique function that also contains " fibrillation ", the fiber product made from bamboo dissolving pulp, have ventilative, good hygroscopicity, antibacterial, intend the function that other fibers such as bacterium do not have, be subject to textile industry and consumers in general's favor.Existing Some Enterprises attempts usining the raw materials for production of bamboo pulp as 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;
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.
Formerly the patent No. is that CN200610020984.5(name is called " 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 wood, bamboo, can effectively the advantage of 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, formerly adopting in the aftertreatment technology of patent CN200610020984.5 is unsuitable for the bleaching of wood, bamboo compound pulp.
Summary of the invention
For overcome existing viscose produce in aftertreatment technology to wood, bamboo pulp compound pulp have that production efficiency is low, unstable product quality, environmental protection be difficult to up to standard, invest huge and existing bleaching process and be unsuitable for many drawbacks of the bleaching of wood, bamboo compound pulp, the present invention is directed to the own characteristic of wood, bamboo compound pulp, propose the aftertreatment technology that a kind of compound pulp of usining wood pulps 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 wood pulps and bamboo pulp as not bleaching raw material, and technical process comprises: bleach-wash-manufacture paper with pulp.
The aftertreatment technology of a kind of wood, bamboo compound pulp, comprise: bleach-wash-manufacture paper with pulp, it is characterized in that: in selected wood, 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≤13, irony≤30ppm.
Described bleaching refers to: compound pulp is sent into the Bellmer of adjusting after alkali and carry out sodium hypochlorite bleaching, after dechlorination, acid treatment, complete bleaching.Described tune alkali number is 20-200g/m
3; Described clorox consumption 0.1-0.6g/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 1-4%, calgon consumption 0.5-2%, consumption of oxalic acid 0.5-2%.
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 wood, bamboo compound pulp, wood pulps accounts for 40-60%, and bamboo pulp accounts for 40-60%.Finished product pulp shaping evenness is good, and intensity is high, and first fibre is high, and yield is high.
Described wood, bamboo compound pulp are the compound pulp of bamboo pulp and needlebush paper pulp, bamboo pulp and 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 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 wood, bamboo 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 wood pulps and bamboo pulp is raw material, brought into play the excellent properties of two kinds of fibers, and the excellent properties of various slurries can be combined, overcome that bamboo pulp cellulosic is hard, thick walled fiber is more and high in cost of production shortcoming, product viscosity is more evenly distributed, can more effectively removes the good characteristic that non-cellulosic impurity, various raw material itself possess and more easily embodies, and performance is more stable.
(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 wood, bamboo 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 wood, bamboo compound pulp.
(4) 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.
(5) owing to having controlled wood pulps in wood, bamboo compound pulp, account for 40% ~ 60%, bamboo pulp accounts for 40% ~ 60%, 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
True qualities needlebush paper pulp and true qualities bamboo pulp are as not floating compound slurry
In selected wood, bamboo compound pulp, wood pulp accounts for 40%, and bamboo pulp accounts for 60%.
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, enter slurry, steam is warming up to 60 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 20g/m by slurry volume ratio
3, bleaching is 0.1g/l with clorox consumption, 25 minutes used times of bleaching, by 2 times of residual chlorine dose in slurry, add hypo dechlorination, and add 4% hydrochloric acid, 2% oxalic acid, 2% calgon carries out acid treatment 60 minutes.
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: plain boiled water;
Online concentration: 1.5%;
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 2
The compound slurry that do not float of true qualities needlebush paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 60%, 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 4% by slurry weight percentage, enter slurry, steam is warming up to 30 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 200g/m by slurry volume ratio
3, bleaching is 0.6g/l with clorox consumption, 24 minutes used times of bleaching, by 1.8 times of residual chlorine dose in slurry, add hypo dechlorination, and add 1% hydrochloric acid, 0.5% oxalic acid, 1% calgon carries out acid treatment 40 minutes.
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: 0.1Mpa;
Second press pressure: 0.2Mpa;
Three road squeeze pressure: 0.7Mpa;
Drying cylinder steam pressure: 0.2Mpa;
Cut paper specification: 600*800;
Metering specification: 200Kg/ bag.
Embodiment 3
Bleach the compound slurry that do not float of needlebush paper pulp and true qualities bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 25%, and bamboo pulp accounts for 75%.
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, enter slurry, steam is warming up to 30 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 60g/m by slurry volume ratio
3, bleaching is 0.3g/l with clorox consumption, 18 minutes used times of bleaching, by 1.8 times of residual chlorine dose in slurry, add hypo dechlorination, and add 4% hydrochloric acid, 0.5% oxalic acid, 0.5% calgon carries out acid treatment 30 minutes.
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: 1%;
One squeeze pressure: 0.2Mpa;
Second press pressure: 0.2Mpa;
Three road squeeze pressure: 0.5Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 250Kg/ bag.
Embodiment 4
True qualities leaf wood paper pulp and true qualities bamboo pulp do not float compound slurry
In selected wood, bamboo compound pulp, wood pulp accounts for 30%, 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% by slurry weight percentage, enter slurry, steam is warming up to 40 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 70g/m by slurry volume ratio
3, bleaching is 0.2g/l with clorox consumption, 18 minutes used times of bleaching, by 2 times of residual chlorine dose in slurry, add hypo dechlorination, and add 3% hydrochloric acid, 1% oxalic acid, 2% calgon carries out acid treatment 40 minutes.
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: 0.7%;
Desanding pressure: 0.3Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 0.8%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.4Mpa;
Drying cylinder steam pressure: 0.2Mpa;
Cut paper specification: 600*800;
Metering specification: 200Kg/ bag.
Embodiment 5
The compound slurry that do not float of true qualities leaf wood paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 70%, 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, enter slurry, steam is warming up to 45 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 30g/m by slurry volume ratio
3, bleaching is 0.5g/l with clorox consumption, 20 minutes used times of bleaching, by 1.9 times of residual chlorine dose in slurry, add hypo dechlorination, and add 1% hydrochloric acid, 0.5% oxalic acid, 0.8% calgon carries out acid treatment 50 minutes.
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: 0.25Mpa manufactures paper with pulp;
The water of sizing mixing: plain boiled water;
Online concentration: 1.2%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.4Mpa;
Three road squeeze pressure: 0.5Mpa;
Drying cylinder steam pressure: 0.3Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 6
The compound slurry that do not float of bleaching leaf wood paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 50%, 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 4% by slurry weight percentage, enter slurry, steam is warming up to 30 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 60g/m by slurry volume ratio
3, bleaching is 0.2g/l with clorox consumption, 19 minutes used times of bleaching, by 1.8 times of residual chlorine dose in slurry, add hypo dechlorination, and add 2% hydrochloric acid, 1.5% oxalic acid, 2% calgon carries out acid treatment 60 minutes.
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: 0.15Mpa manufactures paper with pulp;
The water of sizing mixing: clear water;
Online concentration: 0.6%;
One squeeze pressure: 0.2Mpa;
Second press pressure: 0.3Mpa;
Three road squeeze pressure: 0.6Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 7
Bleaching leaf wood paper pulp and true qualities bamboo pulp are as the raw material of compound pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 20%, and bamboo pulp accounts for 80%.
The preparation technology of the compound pulp of bleaching leaf wood paper pulp and true qualities bamboo pulp comprises following processing step:
The first step: procedure for preparation
A, raw material are prepared
According to bleaching leaf wood 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 bleaching leaf wood 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
To bleach leaf wood paper pulp and become pulp board with true qualities bamboo pulp dispersion treatment, then will bleach leaf wood paper pulp and true qualities bamboo pulp mixes with sodium hydroxide solution, carry out pulping processing, the mixture that obtains bleaching leaf wood 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 to fiber over dry gross weight and the percentage of bleaching mixture (the starching congee) weight of leaf wood paper pulp and true qualities bamboo pulp and sodium hydroxide solution in bleaching leaf wood paper pulp and true qualities bamboo pulp.
Described in step B will bleach leaf wood paper pulp and true qualities bamboo pulp mixes with sodium hydroxide solution, carrying out pulping processes and to refer to bleaching leaf wood 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 liquid weight and the percentage of bleaching mixture (the starching congee) weight of leaf wood 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 3% by slurry weight percentage, enter slurry, steam is warming up to 55 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 80g/m by slurry volume ratio
3, bleaching is 0.5g/l with clorox consumption, 25 minutes used times of bleaching, by 2 times of residual chlorine dose in slurry, add hypo dechlorination, and add 4% hydrochloric acid, 2% oxalic acid, 1.5% calgon carries out acid treatment 30 minutes.
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: plain boiled water;
Online concentration: 0.8%;
One squeeze pressure: 0.2Mpa;
Second press pressure: 0.4Mpa;
Three road squeeze pressure: 0.3Mpa;
Drying cylinder steam pressure: 0.3Mpa;
Cut paper specification: 600*800;
Metering specification: 180Kg/ bag.
Embodiment 8
The compound slurry that do not float of bleaching needlebush paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 80%, and bamboo pulp 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 4% by slurry weight percentage, enter slurry, steam is warming up to 35 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 200g/m by slurry volume ratio
3, bleaching is 0.6g/l with clorox consumption, 25 minutes used times of bleaching, by 2 times of residual chlorine dose in slurry, add hypo dechlorination, and add 3% hydrochloric acid, 1% oxalic acid, 1.5% calgon carries out acid treatment 45 minutes.
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: 0.9%;
One squeeze pressure: 0.3Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.4Mpa;
Drying cylinder steam pressure: 0.3Mpa;
Cut paper specification: 600*800;
Metering specification: 200Kg/ bag.
Embodiment 9
The compound slurry that do not float of bleaching needlebush paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 95%, and bamboo pulp 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, enter slurry, steam heats up 50 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 30g/m by slurry volume ratio
3, bleaching is 0.4g/l with clorox consumption, 20 minutes used times of bleaching, by 1.9 times of residual chlorine dose in slurry, add hypo dechlorination, and add 3% hydrochloric acid, 0.5% oxalic acid, 0.8% calgon carries out acid treatment 45 minutes.
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: 1.4%;
One squeeze pressure: 0.1Mpa;
Second press pressure: 0.5Mpa;
Three road squeeze pressure: 0.6Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 10
The compound slurry that do not float of bleaching needlebush paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 82%, and bamboo pulp accounts for 18%.
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, enter slurry, steam heats up 55 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 45g/m by slurry volume ratio
3, bleaching is 0.6g/l with clorox consumption, 20 minutes used times of bleaching, by 1.9 times of residual chlorine dose in slurry, add hypo dechlorination, and add 3% hydrochloric acid, 0.5% oxalic acid, 0.6% calgon carries out acid treatment 45 minutes.
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: 1Mpa;
Drying cylinder steam pressure: 0.15Mpa;
Cut paper specification: 600*800;
Metering specification: 150Kg/ bag.
Embodiment 11
The compound slurry that do not float of bleaching needlebush paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 48%, and bamboo pulp accounts for 52%.
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, enter slurry, steam heats up 55 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 50g/m by slurry volume ratio
3, bleaching is 0.4g/l with clorox consumption, 20 minutes used times of bleaching, by 1.9 times of residual chlorine dose in slurry, add hypo dechlorination, and add 3.5% hydrochloric acid, 1.8% oxalic acid, 1.6% calgon carries out acid treatment 35 minutes.
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
The compound slurry that do not float of bleaching needlebush paper pulp and bleaching bamboo pulp
In selected wood, bamboo compound pulp, wood pulp accounts for 38%, 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 4.6% by slurry weight percentage, enter slurry, steam heats up 35 ℃, stops passing into steam, and the tune alkali number of adjusting alkali to use is 160g/m by slurry volume ratio
3, bleaching is 0.4g/l with clorox consumption, 22 minutes used times of bleaching, by 1.8 times of residual chlorine dose in slurry, add hypo dechlorination, and add 3% hydrochloric acid, 1.2% oxalic acid, 0.6% calgon carries out acid treatment 55 minutes.
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 (7)
1. the aftertreatment technology of a wood, bamboo compound pulp, comprise: bleach-wash-manufacture paper with pulp, it is characterized in that: in selected wood, bamboo compound pulp, wood pulps and bamboo pulp are 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, it is 3-5% that described aftertreatment technology enters to starch concentration, and described bleaching temperature is 30-60 ℃;
Described bleaching refers to: compound pulp is sent into the Bellmer of adjusting after alkali and carry out sodium hypochlorite bleaching 18-25 minute, after dechlorination, acid treatment, complete bleaching, technological parameter is as follows:
Adjust alkali number: 20-200g/m
3;
Clorox consumption: 0.1-0.6g/l;
Hypo consumption: the 1.8-2 of residual chlorine doubly;
Acid treatment: hydrochloric acid consumption 1-4%,
Calgon consumption 0.5-2%,
Consumption of oxalic acid 0.5-2%.
2. the aftertreatment technology of a kind of wood according to claim 1, bamboo compound pulp, is characterized in that: described tune alkali number is 60-80g/m
3.
3. the aftertreatment technology of a kind of wood according to claim 1, bamboo compound pulp, is characterized in that: the described acid-treated processing time is 30-60 minute.
4. the aftertreatment technology of a kind of wood according to claim 1, bamboo compound pulp, is characterized in that: it is 3%-5% that described aftertreatment technology enters to starch concentration.
5. the aftertreatment technology of a kind of wood according to claim 1, 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.
6. the aftertreatment technology of a kind of wood according to claim 5, 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.
7. according to the aftertreatment technology of a kind of wood described in any one in claim 1-6, bamboo compound pulp, it is characterized in that: in described wood, bamboo compound pulp, wood pulps accounts for 40% ~ 60%, and bamboo pulp accounts for 40% ~ 60%.
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| CN201210170726.0A CN102704317B (en) | 2012-05-29 | 2012-05-29 | Post-processing technology for wood-bamboo composite pulp |
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| JP2002363882A (en) * | 2001-06-06 | 2002-12-18 | Onda Akio | Bagasse paper for printing and method for producing the same |
| CN100355954C (en) * | 2006-05-08 | 2007-12-19 | 宜宾丝丽雅股份有限公司 | Cotton and bamboo composite cellulose pulp and method for producing same |
| CN101148836B (en) * | 2007-11-12 | 2010-06-09 | 宜宾长毅浆粕有限责任公司 | Paper-making-stage bamboo wood pulp plate denaturalization producing technique |
| CN101435164B (en) * | 2007-11-12 | 2010-12-22 | 宜宾长毅浆粕有限责任公司 | Modified production process of paper making level sulphate wood pulp plate |
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