CN102677507B - Cooking process for carrying out composite modification on natural color bamboo paper pulp and cotton paper pulp to form dissolving pulp - Google Patents
Cooking process for carrying out composite modification on natural color bamboo paper pulp and cotton paper pulp to form dissolving pulp Download PDFInfo
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Abstract
The invention discloses a cooking process for carrying out composite modification on natural color bamboo paper pulp and cotton paper pulp to form dissolving pulp. The cotton paper pulp is fed into a digester by a conveyor to be separately cooked; the cooked cotton paper pulp is compounded with the natural color bamboo paper pulp which is subjected to material preparation; the composite paper pulp is fed into a continuous digester to be cooked; a continuous steaming pipe of the continuous digester is provided with three sections; the section connected with a pre-reaction bin is provided with a steam pipe and a T-shaped pipe; the other two sections are provided with steam pipes; steam is filled into the continuous digester through the steam pipes; and alkali liquor is added into the continuous steaming pipe by the T-shaped pipe. According to the invention, the natural color bamboo paper pulp and the cotton paper pulp are used as the raw materials, so that the cost of preparing the dissolving pulp is reduced to a great extent and the quality requirement of the dissolving pulp for viscose is also met.
Description
Technical field
The present invention relates to, by true qualities bamboo pulp and the composite modified method for dissolving pulp of cotton paper slurry, relate in particular to by true qualities bamboo pulp and the composite modified technique for dissolving pulp of cotton paper slurry, wherein, dissolving pulp refers to pulp for viscose, cellulose and cellulose derivative.
Background technology
Application number is 200710050470.9, Granted publication number is CN101158125, Granted publication day is that the Chinese invention patent in April 9 in 2008 discloses a kind of papermaking level needlebush pulpboard modified technique, what wherein digesting technoloy adopted is to adopt soda processes, sulfate process or sulphite process to carry out boiling papermaking grade wood pulp plate, and digestant is respectively NaOH, NaOH+Na
2s, Na
2sO
3+ NaOH, process conditions are: 1, soda processes, the total alkali concn of kraft cooking liquid are 40-120g/l, liquor ratio 1:2.5-4.0; Sulfite cooking liquid total acid consumption 5-9%, liquor ratio 1:3.0-4.0; 2, cooking liquor initial temperature>=40 ℃; 3, the 10-15 minute that heats up in advance, to 105 ± 5 ℃; 4, stop after vapour dry run 25-30 minute again; 5, adopt 3 times with interior little venting; 6, holding temperature 135-172 ℃, heated up in 2 hours total times.Digesting technoloy provided by the invention has added digestant, cooking homogeneities and digesting technoloy are various, papermaking level wood paddle board has been obtained good purification polyester effect after this digesting technoloy, the indices of the wood pulps that this invention finally makes can match in excellence or beauty by Cotton Pulp index with similar viscose, thereby has reduced production cost.But China is a country that timber is in great shortage, the production cost that is modified as wood pulps with papermaking level wood paddle board is higher, and the viscose of producing by single wood pulps, and performance dullness shows that individual character is not outstanding.
And application number is 200910263444.3, Granted publication number is CN101736637A, Granted publication day is that the Chinese invention patent application on June 16th, 2010 discloses a kind of true qualities of utilizing and do not float the production method that bamboo dissolved pulp is prepared in bamboo pulp modification, step is not float true qualities bamboo pulp after discongesting, after thickening, send into double helix roll-type fiberizer, in machine, continue dehydration, and add liquid, slurry completes and continues to concentrate in machine, rub, liquid mixed processes, then slurry is transported to boiling vessel, after boiling, enter and comprise washing, bleaching is in interior subsequent handling, until manufacture paper with pulp, wherein cooking schedule is: go out double helix roll-type fiberizer slurry temperature: 40-95 ℃, enter boiling vessel temperature: 40-80 ℃, liquor ratio: 1:3.0-7.0, bunker amount: 150-250kg over dry slurry/m
3, Elevated Temperature Conditions: pan feeding temperature is warmed up to 120 ℃, time 30-60min, 120 ℃ of insulation 30-120min, venting 5-20min, continues to be warmed up to 140-145 ℃, heating-up time 30-60min, at 140-145 ℃, insulation 120-180min, be incubated the complete 165-170 ℃ that continues to be warmed up to, insulation 30-180min, is incubated complete, cooling blowing, after blowing through filtering stock quality index: whiteness: 45-75%, alpha-cellulose: 85-95%, yield: 65-85%, viscosity: 14-18mpa.s.The present invention utilizes true qualities not float bamboo pulp and is modified as bamboo pulp for cellulose viscose and has reduced to a great extent production cost, and the bamboo pulp alpha-cellulose content that has expanded resource provisioning source and this law manufacture is higher, is applicable to long or short filament fiber.But bamboo pulp prepared by this invention exists following shortcoming: 1, yield is lower, the highest yield is only 85%.2, alpha-cellulose content fluctuation is larger, and from 85% to 95%, make modification bamboo pulp alpha-cellulose content out unstable.3, average fiber length is lower than papermaking xylon, and production process ash content, pentosan content are high, and bamboo fibrid matter is hard, thick walled fiber is more, lumen is narrow, fibr tissue is fine and close, there is air in cell and cause dissolving difficulty, chemical industry consumption is large.4, the viscose that single bamboo pulp is produced, performance dullness, shows that individual character is not outstanding.
Above-mentioned papermaking level needlebush pulpboard modified technique and utilize true qualities not float bamboo pulp modification and prepare wood pulps and the bamboo pulp that the production method of bamboo dissolved pulp produces and there is the strengths and weaknesses separately, performance is different, have their own characteristics each, as the deflection of skin affinity, fiber, antibacterial bacteriostatic function, fiber soft feeling, deodorization, gas permeability, coloring, bounce-back, humidity absorption and release etc.Hence one can see that finds out a kind of modified technique by two kinds of composite modified dissolving pulps of preparing of raw material, makes up shortcoming separately, and the advantage retaining is separately very necessary.
Application number is 200610020971.8, and Granted publication number is CN1844497, and Granted publication day is that the patent of invention on October 11st, 2006 discloses a kind of composite cellulose pulp and manufacture method thereof of being produced by wood, cotton mixing.Composite cellulose pulp by velveteen, timber, fiber crops, bamboo wood any two kinds or two or more raw-material any combination made, digesting technoloy is wherein: cotton soda process, the wood of adopting adopts sulfate process or sulfite cooking, adds NaOH, Na by the 5.0-35.0% of oven dry weight
2s, Na
2sO
3, H
2sO
3in one or more, liquor ratio is: 1:1.0～9.5, boiling first vacuumizes, intensification number of times>=1 time, little venting number of times>=0 time, maximum temperature≤200 ℃ of at every turn heating up, each heat up, temperature retention time≤800 minute.The present invention proposes the new approaches of New Viscose Fibre pulp and production thereof, can effectively advantage cotton, wood fiber raw material be put together, select the essence, discarding dross, provide and be satisfied with viscose and show different performance, the needs of different class to pulp material, and expand the source of raw material, reduced the production cost of viscose pulp.But the digesting apparatus that the digesting technoloy that this invention relates to adopts is rotary spherical digester, vertical pot or boiling vessel, its unit equipment yields poorly, uses that artificial amount is large, security is not high, thereby causes its production efficiency low.Its cooking liquor is than being 1:1.0～9.5, and cooking liquor, than large, need the liquid of heating many, thereby causes energy consumption high.The digesting apparatus heat transference efficiency using is low, thereby causes cooking homogeneities poor, and digester cycle is long.
Application number is 200810044655.3, Granted publication number is CN101333778, Granted publication day is the production method that the application for a patent for invention on December 31st, 2008 discloses a kind of dissolving pulp by oxygen continuous digesting method, comprises the steps: cotton linter preliminary treatment: cotton linter is carried out to the preliminary treatment such as cotton linter shredding, cyclonic separation and dedusting, feeding, the processing of two roller defibrination with two roller fiberizers; . oxygen extraction with steam: adopt transverse tube to connect and steam device, by the effect of high temperature, alkali, oxygen or hydrogen peroxide, realize continuous, quick, oligosaprobic preparation and dissolve cotton pulp.Even steam device comprises pre-reaction feed bin, two roller meter, feeding serew, T-shaped pipe, steam pipe and cold spraying device to transverse tube.The present invention effectively realizes cut-out after cotton linter dry raw material preparation, tear and the destruction of cell primary wall, in cotton linter, the physics of a large amount of impurity, chemistry are removed, cotton linter is in the poly-cellulosic purification of carapax et plastruw testudinis kind of the poly-and fast prompt drop of fast prompt drop of even steaming in device, the recycling of used heat in production link, the problem such as reduction of COD total amount in black liquor, and cooking homogeneities, digester cycle are short.But this invention is only applicable to cotton linter modification to be prepared into viscose, prepares dissolving pulp if compound material is carried out to modification by method provided by the invention, the quality index of the dissolving pulp after modification does not reach the requirement of dissolving pulp, and it is high to consume energy, and yield is low.
In sum, mainly there is following shortcoming in above-mentioned several patents of invention: 1, raw material is single, and the dissolving pulp performance produced is single, show that individual character is outstanding.2, single raw material has shortcoming separately, and production cost is high or yield is low, unstable product quality.3, production equipment fall behind, consume energy high, half steaming is even.
Summary of the invention
In order to overcome above-mentioned defect, the invention provides the composite modified digesting technoloy for dissolving pulp of a kind of true qualities bamboo pulp and cotton paper slurry, this digesting technoloy can by composite modified true qualities bamboo pulp and cotton paper slurry be dissolving pulp, and the viscose dissolving pulp of preparing by this digesting technoloy modification is compared with similar viscose Cotton Pulp or wood pulps, its quality index all can meet viscose pulp requirement, and steady quality, yield is higher, thereby widen the range of choice of raw material, reduce production cost, its boiling efficiency is high, digester cycle is short, cooking homogeneities, energy consumption is low.
For achieving the above object, the technical solution used in the present invention is:
True qualities bamboo pulp and cotton paper slurry are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described digesting technoloy comprises twice boiling, boiling is for the first time used for the cotton paper slurry after independent boiling is got the raw materials ready, the using compound pulp of the true qualities bamboo pulp through the cotton paper slurry after boiling for the first time and after getting the raw materials ready for boiling of boiling for the second time.
Described boiling for the first time adopts sulphite process to carry out boiling, and the digesting apparatus of selection is steamer, and digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 5%-30%; Liquor ratio 1:2.0-6.0, cooking liquor initial temperature 10-50 ℃, the 200-240 minute that heats up in advance, to 130-170 ℃, insulation running 100-180 minute, adopts three times with interior little venting, holding temperature 130-170 ℃, digester cycle time 300-420 minute.
Described cotton paper slurry its quality index after boiling is for the first time: fine content >=90% of cotton paper slurry first, whiteness >=30%, degree of polymerization 1000-1500DP, ash content≤0.71%.
Described boiling be for the second time by boiling cotton paper slurry later with get the raw materials ready after the using compound pulp of true qualities bamboo pulp send into continuous steamer and carry out boiling, the steam pipe of described continuous steamer is provided with 3 sections, cooking schedule:
Liquor ratio: 1:2.0～4.0;
Compression ratio: 1:2.0～3.0:
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ± 5 ℃;
Middle one section of temperature that passes into steam is: 140 ± 5 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 145 ℃～170 ℃;
Add NaOH solution to steam pipe, add by the 17%-23% of oven dry weight.
Described boiling cotton paper slurry later with the compositely proportional of the true qualities bamboo pulp later of getting the raw materials ready is: cotton paper slurry: true qualities bamboo pulp=70%～90%:10%～30%.
Fine content >=88% of true qualities bamboo pulp first after described getting the raw materials ready, whiteness >=40%, degree of polymerization 1000-1300DP, ash content≤0.5%.
The present invention has the following advantages:
1, the present invention adopts the using compound pulp of true qualities bamboo pulp and cotton paper slurry to be modified as dissolving pulp, overcome by single true qualities bamboo pulp modified bamboo pulp pentose, ash content is higher and whiteness is poor defect, with the cotton paper slurry with single be modified as the cost of Cotton Pulp high, without the defect of antibacterial action, the advantage that the dissolving pulp that adopts digesting technoloy provided by the invention to prepare has bamboo pulp has advantages of again Cotton Pulp, and the fine content of low cost of manufacture, first is high, pentose, ash content are low and whiteness advantages of higher.
2, the boiling method that the using compound pulp of true qualities bamboo pulp and cotton paper slurry is modified as dissolving pulp by the present invention is to carry out boiling with continuous steamer, thereby make that digester cycle is short, floor space is little, artificial use amount is few, safety, environmental protection, liquor ratio is limited to 1:2.0～4.0, make digestion process power consumption low, and cooking homogeneities.Compression ratio is limited to 1:2.0～3.0, is guaranteeing under the prerequisite of cooking homogeneities, and boiling amount is maximized, and has improved production capacity.The temperature that the first paragraph of steam pipe passes into steam is 105 ± 5 ℃, middle one section is 140 ± 5 ℃, the 3rd section is 145 ℃～170 ℃, using compound pulp is the boiling that progressively heats up in continuous steamer, and the intake of steam comes surely according to liquor ratio, and liquor ratio is larger, the valve of steam regulation pipe, increase the intake of steam, adjusting boiling temperature that can be in good time by the temperature of steam and the intake of steam, thus avoid the generation of crossing boiling and owing boiling.Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, add by the 17%-23% of oven dry weight, the addition of alkali lye is limited to the 17%-23% of oven dry weight, can obtain good cooking effect, make using compound pulp cooking homogeneities, cooking speed fast, and cooking liquor makes full use of, after boiling, the waste liquid of generation is few, be conducive to reduction and the environmental protection of cost, further reduced the generation of black liquor.
3, the present invention first adopts sulfite cooking to carry out compound with true qualities bamboo pulp more later in cotton paper slurry, the object of first cotton paper slurry being carried out to boiling is to reduce the degree of polymerization of cotton paper slurry, make it to be more or less the same with the degree of polymerization of true qualities bamboo pulp, while carrying out boiling like this after two kinds of paper pulp are compound, there will not be cotton paper slurry to owe boiling and true qualities bamboo pulp is crossed boiling, reduce the generation of waste product, improve the yield rate of product, and cooking homogeneities, black liquor amount reduces.
4, true qualities bamboo pulp of the present invention: cotton paper slurry=10%～30%:70%～90%, such ratio mixing finished product pulp shaping evenness is good, and intensity is high, and first fibre is high, and yield is high.True qualities bamboo pulp and cotton paper slurry compound tense, it accounts for maximum ratio is 30%, as exceed this ratio compound after, the digestion process of using compound pulp is wayward, cooking effect is poor, thereby causes the quality index of modification dissolving pulp out not reach the requirement of viscose pulp.During in the compound boiling of ratio provided by the invention, favourable boiling, boiling is more even, can effectively avoid boiling or owe the generation of boiling, and digestion process is easy to control, and alkali lye utilization rate is larger, and black liquor generation is less.
5, fine content >=88% of raw material true qualities bamboo pulp first of the present invention, whiteness >=40%, degree of polymerization 1000-1300DP, ash content≤0.5%, described cotton paper is starched fine content >=88% of first later of boiling for the first time, whiteness >=30%, degree of polymerization 1000-1500DP, ash content≤0.71%, the selection of material quality index can guarantee that the quality index of finished product dissolving pulp reaches requirement, the particularly requirement of the content of first fibre, if lower than described standard, the fine content of the first of finished product dissolving pulp is difficult to reach requirement.
6, the present invention can be modified as dissolving pulp by the mixed pulp of true qualities bamboo pulp and cotton paper slurry, the quality index of the quality index of the dissolving pulp after modification and Cotton Pulp or wood pulps is about the same, meet instructions for use, and method is simple, black liquor amount is little, be easy to control, production cost is low, and raw material range of choice is wide.
The specific embodiment
True qualities bamboo pulp and cotton paper slurry are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described cotton paper is starched after procedure for preparation, with conveyer, cotton paper slurry is sent into boiling vessel and carry out boiling, by boiling cotton paper slurry later with the true qualities bamboo pulp later of getting the raw materials ready according to true qualities bamboo pulp: the ratio of cotton paper slurry=10%～30%:70%～90% is compound, compound according to the above ratio using compound pulp is sent into continuous steamer and carry out boiling, the steam pipe of described continuous steamer is provided with 3 sections, one section that joins with pre-reaction feed bin is provided with steam pipe and T shape pipe, other two sections are provided with steam pipe, cooking schedule: liquor ratio: 1:2.0～4.0, compression ratio: 1:2.0～3.0: one section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ± 5 ℃, middle one section of temperature that passes into steam is: 140 ± 5 ℃, one section of temperature that passes into steam of joining with cold spraying device is: 145 ℃～170 ℃, add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by the 17%-23% of oven dry weight.Boiling for the first time adopts sulphite process to carry out boiling, and the digesting apparatus of selection is steamer, and digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 5%-30%; Liquor ratio 1:2.0-6.0, cooking liquor initial temperature 10-50 ℃, the 200-240 minute that heats up in advance, to 130-170 ℃, insulation running 100-180 minute, adopts three times with interior little venting, holding temperature 130-170 ℃, digester cycle time 300-420 minute.
The present invention adopts the using compound pulp of true qualities bamboo pulp and cotton paper slurry to be modified as dissolving pulp, overcome by single true qualities bamboo pulp modified bamboo pulp pentose, ash content is higher and whiteness is poor defect, with the cotton paper slurry with single be modified as the cost of Cotton Pulp high, without the defect of antibacterial action, the advantage that the dissolving pulp that adopts digesting technoloy provided by the invention to prepare has bamboo pulp has advantages of again Cotton Pulp, and the fine content of low cost of manufacture, first is high, pentose, ash content are low and whiteness advantages of higher.The method that the mixed pulp of true qualities bamboo pulp and cotton paper slurry is modified as the boiling method employing of dissolving pulp by the present invention is to carry out boiling with continuous steamer, thereby make that digester cycle is short, floor space is little, artificial use amount is few, safety, environmental protection, liquor ratio is limited to 1:2.0～4.0, make digestion process power consumption low, and cooking homogeneities.Compression ratio is limited to 1:2.0～3.0, is guaranteeing under the prerequisite of cooking homogeneities, and boiling amount is maximized, and has improved production capacity.The temperature that the first paragraph of steam pipe passes into steam is 105 ± 5 ℃, middle one section is 140 ± 5 ℃, the 3rd section is 145 ℃～170 ℃, using compound pulp is the boiling that progressively heats up in continuous steamer, and the intake of steam comes surely according to liquor ratio, and liquor ratio is larger, the valve of steam regulation pipe, increase the intake of steam, adjusting boiling temperature that can be in good time by the temperature of steam and the intake of steam, thus avoid the generation of crossing boiling and owing boiling.Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, add by the 17%-23% of oven dry weight, the addition of alkali lye is limited to the 17%-23% of oven dry weight, can obtain good cooking effect, make using compound pulp cooking homogeneities, cooking speed fast, and cooking liquor makes full use of, after boiling, the waste liquid of generation is few, be conducive to reduction and the environmental protection of cost, further reduced the generation of black liquor.The present invention first adopts sulfite cooking to carry out compound with true qualities bamboo pulp more later in cotton paper slurry, the object of first cotton paper slurry being carried out to boiling is to reduce the degree of polymerization of cotton paper slurry, make it to be more or less the same with the degree of polymerization of true qualities bamboo pulp, while carrying out boiling like this after two kinds of paper pulp are compound, there will not be cotton paper slurry to owe boiling and true qualities bamboo pulp is crossed boiling, reduce the generation of waste product, improve the yield rate of product, and cooking homogeneities, black liquor amount reduces.True qualities bamboo pulp of the present invention: cotton paper slurry=10%～30%:70%～90%, such ratio mixing finished product pulp shaping evenness is good, and intensity is high, and first fibre is high, and yield is high.During in the compound boiling of this ratio, favourable boiling, boiling is more even.Adopt the compound generation that can effectively avoid boiling or owe boiling of this ratio, digestion process is easy to control, and alkali lye utilization rate is larger, and black liquor generation is less.
For the quality index that guarantees finished product dissolving pulp reaches requirement, the particularly requirement of the content of first fibre, fine content >=88% of described true qualities bamboo pulp first, whiteness >=40%, degree of polymerization 1000-1300DP, ash content≤0.5%, described boiling fine content >=88% of cotton paper slurry first later, whiteness >=30%, degree of polymerization 1000-1500DP, ash content≤0.71%.
The processing step that true qualities bamboo pulp and cotton paper slurry mixed pulp is modified as dissolving pulp by the present invention is:
Get the raw materials ready (conventional dry raw material preparation or wet feed preparation all can), boiling, washing, removal of impurities, bleaching, secondary washing, copy the dregs of rice.And inventive point of the present invention is digesting technoloy, other techniques can adopt existing technique, also can adopt technique provided by the invention.
Embodiment 1
A, cotton paper slurry are got the raw materials ready
Cotton paper pulpboard is disperseed cotton paper pulpboard with dispersal device such as bale opener, hello dregs of rice machine, leaflet cutter etc., with cutting equipment and disintegrating apparatus as pulper, pulverizer is ground into pulpboard cotton-shaped, cotton-shaped cotton paper pulpboard is sent in steamer with conveying equipment (blower fan, cyclone separator, conveying worm), in the process of sending into steamer, drop into cotton paper pulpboard while add NaOH solution.This stock method is called dry raw material preparation in this area.The cotton paper slurry side of the present embodiment adopts this stock method to get the raw materials ready.
It is as follows that the present embodiment cotton paper is starched the concrete technology requirement of getting the raw materials ready:
1, cotton paper pulpboard specification: 600 × 800mm.
2, feed dregs of rice speed: 60 ~ 100Kg/min.
3,5/time of feed of crusher frequency: <.
4, broken rear fibre length: length > 1.5mm.
5, broken rear fibre length is less than 0.5mm ratio: < 5%
6, wadding fibrous bulking intensity: 500 ~ 1000g/L.
7, yield: > 98%.
B, cotton paper are starched independent boiling:
The cotton-shaped cotton paper slurry of steps A being made with conveying worm or belt conveyor is sent to steamer, and digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 5%-30%; Liquor ratio 1:2.0-6.0, cooking liquor initial temperature 10-50 ℃, the 200-240 minute that heats up in advance, to 130-170 ℃, insulation running 100-180 minute, adopts three times with interior little venting, holding temperature 130-170 ℃, digester cycle time 300-420 minute.
C, true qualities bamboo paper pulpboard are got the raw materials ready
True qualities bamboo paper pulpboard is disperseed with bleaching bamboo paper pulpboards such as dispersal device such as bale opener, hello dregs of rice machine, leaflet cuttves, pulpboard is ground into cotton-shaped with cutting equipment and disintegrating apparatus as pulper, pulverizer, cotton-shaped true qualities bamboo pulp plate is sent in digesting apparatus with conveying equipment (blower fan, cyclone separator, conveying worm), send into digesting apparatus before, in the process of sending into digesting apparatus, drop into raw material while add cooking liquor (NaOH).This stock method is called dry raw material preparation in this area.The present embodiment adopts this stock method to get the raw materials ready.
The concrete technology requirement of getting the raw materials ready of the present embodiment true qualities bamboo pulp is as follows:
1, bamboo pulp plate gauge lattice: 600 × 800mm.
2, feed dregs of rice speed: 60 ~ 100Kg/min.
3,5 of disintegrating machine feeding number: <.
4, broken rear fibre length: length > 1mm.
5, broken rear fibre length is less than 0.5mm ratio: < 10%
6, wadding fibrous bulking intensity: 200 ~ 800g/L.
7, yield: > 95%.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent into and in the pre-reaction feed bin of continuous steamer, carried out compoundly, wherein true qualities bamboo pulp accounts for 10% of using compound pulp.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into NaOH solution by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
Compound cooking schedule is as follows:
Liquor ratio: 1:2.0;
Compression ratio: 1:2.0:
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 100 ℃;
Middle one section of temperature that passes into steam is: 135 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 145 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 17% of oven dry weight.
F, washing:
Adopt multistage counter current washing process, and in washing process, add a kind of washing assisant Busperse 2838, 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 2.0%, then adds washing assisant Busperse 2838, and consumption is 0.5 kg/tonne of slurry, mixes 20 minutes, gets by carrying stock pump, 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 75 ℃;
C starches subsequently and enters II section wash engine, carries out spray washing by the washing reuse plain boiled water of III section black liquor slot, 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, carries out spray washing by the cleaning solution adding, and the cleaning solution after washing enters III section filtrate tank, and the slurry after washing enters slurry tower.
G, removal of impurities:
H, bleaching:
Bleaching refers to that compound pulp after treatment chlorination is sent into the Bellmer of adjusting after alkali carries out sodium hypochlorite bleaching, 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%.
I, secondary washing
J, copy the dregs of rice
Copying dregs of rice process flow is: compound stock tank-copy forebay-stuff box-desander-pulp machine-cut paper stacker-weighing balance-baling press-warehouse-in, and its process conditions are:
Copy dregs of rice desanding concentration: 0.6-1.5%;
Copy dregs of rice desanding pressure: 0.15-0.32Mpa;
The water of sizing mixing: clear water or 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.
The present embodiment steams and compoundly boils rear quality index and be: fine content >=89.5% of first, whiteness >=60%, viscosity 10 ~ 12mpa.s, yield >=85%
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=94.5% of first, whiteness >=80.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 2
A, cotton paper slurry are got the raw materials ready;
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method
C, true qualities bamboo paper pulpboard are got the raw materials ready
The requirement of this step is identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=10%:90%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:2.5;
Compression ratio: 1:2.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 135 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 150 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 20% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=91% of first, whiteness >=68%, viscosity 10 ~ 12mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=93% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 3
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=10%:90%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:3.0;
Compression ratio: 1:2.5;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 140 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 160 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 21% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice, operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=92% of first, whiteness >=70%, viscosity 10 ~ 12mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=94% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 4
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=10%:90%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:4.0;
Compression ratio: 1:3.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 140 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 160 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 21% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=89% of first, whiteness >=69%, viscosity 10 ~ 13mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=92% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 5
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=10%:90%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:4.0;
Compression ratio: 1:3.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 110 ℃;
Middle one section of temperature that passes into steam is: 145 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 175 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 23% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=94% of first, whiteness >=68%, viscosity 10 ~ 14mpa.s, yield >=89%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=96% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 6
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=20%:80%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:2.0;
Compression ratio: 1:2.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 100 ℃;
Middle one section of temperature that passes into steam is: 135 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 145 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 17% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=89% of first, whiteness >=68%, viscosity 10 ~ 12mpa.s, yield >=89%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=92% of first, whiteness >=74%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 7
A, cotton paper slurry are got the raw materials ready;
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method
C, true qualities bamboo paper pulpboard are got the raw materials ready
The requirement of this step is identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=20%:80%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:2.5;
Compression ratio: 1:2.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 135 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 150 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 20% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=93% of first, whiteness >=70%, viscosity 10 ~ 12mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=94% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 8
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=20%:80%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:3.0;
Compression ratio: 1:2.5;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 140 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 160 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 21% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice, operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=93% of first, whiteness >=65%, viscosity 10 ~ 12mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=94% of first, whiteness >=76.0%, viscosity 10 ~ 11 mpa.s, yield 90 ~ 95%.
Embodiment 9
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=20%:80%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:4.0;
Compression ratio: 1:3.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 140 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 160 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 21% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=90% of first, whiteness >=72%, viscosity 10 ~ 13mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=96% of first, whiteness >=74%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 10
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=20%:80%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:4.0;
Compression ratio: 1:3.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 110 ℃;
Middle one section of temperature that passes into steam is: 145 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 175 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 23% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=92% of first, whiteness >=67%, viscosity 10 ~ 14mpa.s, yield >=89%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=95% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 11
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=30%:70%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:2.0;
Compression ratio: 1:2.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 100 ℃;
Middle one section of temperature that passes into steam is: 135 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 145 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 17% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=88% of first, whiteness >=66%, viscosity 10 ~ 12mpa.s, yield >=89%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=91% of first, whiteness >=72%, viscosity 10 ~ 12 mpa.s, yield 92%.
Embodiment 12
A, cotton paper slurry are got the raw materials ready;
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method
C, true qualities bamboo paper pulpboard are got the raw materials ready
The requirement of this step is identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=30%:90%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:2.5;
Compression ratio: 1:2.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 135 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 150 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 20% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=92% of first, whiteness >=69%, viscosity 10 ~ 12mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=94% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Embodiment 13
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=30%:70%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:3.0;
Compression ratio: 1:2.5;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 140 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 160 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 21% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice, operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=94% of first, whiteness >=70%, viscosity 10 ~ 12mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=96% of first, whiteness >=76.0%, viscosity 10 ~ 11 mpa.s, yield 90 ~ 95%.
Embodiment 14
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=30%:70%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:4.0;
Compression ratio: 1:3.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ℃;
Middle one section of temperature that passes into steam is: 140 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 160 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 21% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=92% of first, whiteness >=70%, viscosity 10 ~ 12mpa.s, yield >=85%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=96% of first, whiteness >=72%, viscosity 10 ~ 123mpa.s, yield 90 ~ 94%.
Embodiment 15
A, cotton paper slurry are got the raw materials ready
The stock method of the present embodiment cotton paper slurry is identical with embodiment 1 with requirement.
B, cotton paper are starched independent boiling:
It is identical with embodiment 1 that the cotton paper of the present embodiment is starched independent boiling method.
C, true qualities bamboo paper pulpboard are got the raw materials ready:
The present embodiment true qualities bamboo paper pulpboard is got the raw materials ready identical with embodiment 1.
D, two kinds of pulp boards are compound:
With conveying worm or belt conveyor, the true qualities bamboo paper pulpboard in the cotton paper pulpboard in step B and step C is sent in continuous steamer, its compositely proportional is true qualities bamboo pulp: cotton paper slurry=30%:70%.
E, two kinds of compound boilings of paper pulp:
Be sent to continuous steamer with the cotton-shaped compound pulpboard that conveying worm or belt conveyor are made step D and carry out boiling.When boiling, raw material is squeezed into pre-reaction feed bin, after allowing raw material fully mix, send into again steam pipe and carry out boiling in pre-reaction feed bin, in the time of boiling, pass into alkali lye by T shape pipe to steam pipe, input steam by steam pipe to steam pipe, utilize steam to the using compound pulp boiling of heating, in the time of boiling, spiral ceaselessly rotates, using compound pulp is fully contacted, cooking homogeneities with steam.Workman can be according to the liquor ratio intake of condition steam at any time, thereby controls boiling temperature.
The present embodiment adopts cooking schedule as follows:
Liquor ratio: 1:4.0;
Compression ratio: 1:3.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 110 ℃;
Middle one section of temperature that passes into steam is: 145 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 175 ℃;
Add alkali lye by T shape pipe to steam pipe, alkali lye is NaOH, adds by 23% of oven dry weight.
F, washing; G, removal of impurities; H, bleaching; I, secondary washing; J, copy the dregs of rice; Operation is all identical with embodiment 1.
After the compound boiling of the present embodiment, quality index is: fine content >=94% of first, whiteness >=68%, viscosity 10 ~ 12mpa.s, yield >=89%.
The quality index of the dissolving pulp of making through the present embodiment is: fine content >=96% of first, whiteness >=78.0%, viscosity 10 ~ 12 mpa.s, yield 90 ~ 95%.
Can draw by above-described embodiment, adopt digesting technoloy of the present invention, the mixed pulp of true qualities bamboo pulp and cotton paper slurry can be modified as to dissolving pulp, and the quality index of the dissolving pulp of producing all meet the requirement of national standard.
Applicant adopted the existing digesting technoloy that papermaking wood pulp is modified as to wood pulps when the mixed pulp of true qualities bamboo pulp and true qualities wood pulp is modified as to dissolving pulp, find by test, adopt existing digesting technoloy, boiling quality index is later that the fine content of first is lower than 89%, can not meet the quality requirement of national standard to dissolving pulp at all, and employing is modified as bamboo pulp the digesting technoloy of bamboo pulp, boiling quality index is later that viscosity is lower than 9 mpa.s, and it is larger to fluctuate, can not meet the quality requirement of national standard to dissolving pulp.
Claims (4)
1. true qualities bamboo pulp and cotton paper slurry are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described digesting technoloy comprises twice boiling, boiling is for the first time used for the cotton paper slurry after independent boiling is got the raw materials ready, the using compound pulp of the true qualities bamboo pulp through the cotton paper slurry after boiling for the first time and after getting the raw materials ready for boiling of boiling for the second time;
Described boiling for the first time adopts sulphite process to carry out boiling, the digesting apparatus of selecting is steamer, and digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 5%-30%, liquor ratio 1:2.0-6.0, cooking liquor initial temperature 10-50 ℃, the 200-240 minute that heats up in advance, to 130-170 ℃, insulation running 100-180 minute, adopt three times with interior little venting, holding temperature 130-170 ℃, digester cycle time 300-420 minute;
Described boiling be for the second time by boiling cotton paper slurry later with get the raw materials ready after the using compound pulp of true qualities bamboo pulp send into continuous steamer and carry out boiling, the steam pipe of described continuous steamer is provided with 3 sections, cooking schedule:
Liquor ratio: 1:2.0～4.0;
Compression ratio: 1:2.0～3.0;
One section of temperature that passes into steam of joining with pre-reaction feed bin of steam pipe is: 105 ± 5 ℃;
Middle one section of temperature that passes into steam is: 140 ± 5 ℃;
One section of temperature that passes into steam of joining with cold spraying device is: 145 ℃～170 ℃;
Add NaOH solution to steam pipe, add by the 17%-23% of oven dry weight.
2. true qualities bamboo pulp according to claim 1 and cotton paper slurry are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described cotton paper slurry its quality index after boiling is for the first time: fine content >=90% of cotton paper slurry first, whiteness >=30%, degree of polymerization 1000-1500DP, ash content≤0.71%.
3. true qualities bamboo pulp according to claim 1 and cotton paper slurry are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described boiling cotton paper slurry later with the compositely proportional of the true qualities bamboo pulp later of getting the raw materials ready is: cotton paper slurry: true qualities bamboo pulp=70%～90%:10%～30%.
4. composite modified according to the true qualities bamboo pulp described in claim 1 or 3 and cotton paper slurry be the digesting technoloy of dissolving pulp, it is characterized in that: described in true qualities bamboo pulp first fibre content >=88% after getting the raw materials ready, whiteness >=40%, degree of polymerization 1000-1300DP, ash content≤0.5%.
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| CN104532639A (en) * | 2014-12-09 | 2015-04-22 | 成都丽雅纤维股份有限公司 | Cooking process for compound modification of cotton paper pulp, natural color bamboo paper pulp and natural color wood paper pulp into dissolving pulp |
| CN104532640A (en) * | 2014-12-09 | 2015-04-22 | 成都丽雅纤维股份有限公司 | Cooking process for compound modification of cotton paper pulp, bleaching bamboo paper pulp and bleaching wood paper pulp into dissolving pulp |
| CN109338774A (en) * | 2018-09-18 | 2019-02-15 | 巴州泰昌浆粕有限公司 | Cellulose mixture pulp and preparation method thereof |
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| CN1865548A (en) * | 2006-05-08 | 2006-11-22 | 宜宾丝丽雅股份有限公司 | Cotton and bamboo composite cellulose pulp and method for producing same |
| CN1880525A (en) * | 2006-05-08 | 2006-12-20 | 宜宾丝丽雅股份有限公司 | Composite cellulose viscose filament yarn with composite cellulose pulp as raw materials made of cotton and bamboo mixture and preparation method thereof |
| CN101446052A (en) * | 2008-12-24 | 2009-06-03 | 宜宾长毅浆粕有限责任公司 | Secondary decatizing method for preparing bamboo chemical dissolving pulp and application thereof |
| CN101736427A (en) * | 2009-12-22 | 2010-06-16 | 唐山三友集团东光浆粕有限责任公司 | Bamboo alpha-pulp for viscose and production method thereof |
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| CN1865548A (en) * | 2006-05-08 | 2006-11-22 | 宜宾丝丽雅股份有限公司 | Cotton and bamboo composite cellulose pulp and method for producing same |
| CN1880525A (en) * | 2006-05-08 | 2006-12-20 | 宜宾丝丽雅股份有限公司 | Composite cellulose viscose filament yarn with composite cellulose pulp as raw materials made of cotton and bamboo mixture and preparation method thereof |
| CN101446052A (en) * | 2008-12-24 | 2009-06-03 | 宜宾长毅浆粕有限责任公司 | Secondary decatizing method for preparing bamboo chemical dissolving pulp and application thereof |
| CN101736427A (en) * | 2009-12-22 | 2010-06-16 | 唐山三友集团东光浆粕有限责任公司 | Bamboo alpha-pulp for viscose and production method thereof |
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