CN104532639A - Cooking process for compound modification of cotton paper pulp, natural color bamboo paper pulp and natural color wood paper pulp into dissolving pulp - Google Patents

Cooking process for compound modification of cotton paper pulp, natural color bamboo paper pulp and natural color wood paper pulp into dissolving pulp Download PDF

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Publication number
CN104532639A
CN104532639A CN201410744557.6A CN201410744557A CN104532639A CN 104532639 A CN104532639 A CN 104532639A CN 201410744557 A CN201410744557 A CN 201410744557A CN 104532639 A CN104532639 A CN 104532639A
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pulp
true qualities
cotton
paper pulp
boiling
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刘林
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Chengdu Grace Fiber Co Ltd
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Chengdu Grace Fiber Co Ltd
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00Pulping cellulose-containing materials
    • D21C3/02Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D21C3/022Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing compounds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H15/00Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
    • D21H15/10Composite fibres

Abstract

The present invention discloses a cooking process for compound modification of a cotton paper pulp, a natural color bamboo paper pulp and a natural color wood paper pulp into a dissolving pulp. The cooking process comprises two cooking, wherein the first cooking is used for separately cooking the cotton paper pulp after material preparing, the second cooking is used for cooking the compound paper pulp of the cotton paper pulp being subjected to the first cooking, the natural color bamboo paper pulp after material preparing, and the natural color wood paper pulp after material preparing, the second cooking adopts a continuous cooking device to cook, the continuous steaming pipe of the continuous cooking device is arranged into three sections, the one section connected with a pre-reacting material bin is provided with a T-shaped pipe for adding an alkali liquid and a steam pipe for adding steam, and other two sections are respectively provided with a steam pipe for adding steam. According to the present invention, the raw materials adopt the cotton paper pulp, the natural color bamboo paper pulp and the natural color wood paper pulp, such that the dissolving pulp preparing cost is substantially reduced, the quality requirements of the dissolving pulp for viscose fibers are met, and the performance is diverse.

Description

Cotton paper slurry, true qualities bamboo pulp and true qualities wood pulp are composite modified is the digesting technoloy of dissolving pulp
Technical field
The present invention relates to by cotton method for dissolving pulp composite modified with true qualities wood pulp, particularly relate to by the composite modified method for dissolving pulp of cotton, true qualities bamboo pulp and true qualities wood pulp, wherein, dissolving pulp refers to viscose pulp, cellulose and cellulose derivative.
Background technology
Application number is 200710050470.9, Authorization Notice No. is CN101158125, authorized announcement date 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 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 DEG C; 3, pre-intensification 10-15 minute, to 105 ± 5 DEG C; 4, dry run 25-30 minute is again stopped after vapour; 5, little steam bleeding within adopting 3 times; 6, holding temperature 135-172 DEG C, within 2 hours total times of heating up.Digesting technoloy provided by the invention with the addition of digestant, cooking homogeneities and digesting technoloy is various, papermaking level wood paddle board achieves good purification polyester effect after this digesting technoloy, the indices of the wood pulps that this invention finally obtains can match in excellence or beauty with similar viscose Cotton Pulp index, thus reduces production cost.But China is the country that a timber is in great shortage, be modified as the production cost of wood pulps with papermaking level wood paddle board higher, and with the viscose that single wood pulps is produced, performance is dull, shows that individual character is not given prominence to.
And application number is 200910263444.3, Authorization Notice No. is CN101736637A, authorized announcement date is that the Chinese invention patent application on June 16th, 2010 discloses a kind of production method utilizing true qualities not float bamboo pulp modification to prepare bamboo dissolved pulp, step does not float true qualities bamboo pulp after discongesting, double screwy roller grinded-paste machine is sent into after thickening, dehydration is continued in machine, and add liquid, slurry completes and continues to concentrate in machine, rub, liquid mixed processes, then by slurry transferring to boiling vessel, enter after boiling and comprise washing, bleaching is in interior subsequent handling, until manufacture paper with pulp, wherein cooking schedule is: go out double screwy roller grinded-paste machine slurry temperature: 40-95 DEG C, enter boiling vessel temperature: 40-80 DEG C, liquor ratio: 1:3.0-7.0, bunker amount: 150-250kg over dry slurry/m 3, Elevated Temperature Conditions: pan feeding temperature to 120 DEG C, time 30-60min, 120 DEG C of insulation 30-120min, venting 5-20min, continues to be warmed up to 140-145 DEG C, heating-up time 30-60min, at 140-145 DEG C, insulation 120-180min, be incubated complete continuation and be warmed up to 165-170 DEG C, insulation 30-180min, is incubated complete, cooling blowing, through filtering stock quality index after blowing: 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 reduces production cost to a great extent, expands resource provisioning source and the bamboo pulp alpha-cellulose content of 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, most high yield pulp1 is only 85%.2, alpha-cellulose content fluctuation is comparatively large, from 85% to 95%, makes 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 is dull, shows that individual character is not given prominence to.
The wood pulps that above-mentioned papermaking level needlebush pulpboard modified technique and utilize true qualities not float production method that bamboo pulp modification prepares bamboo dissolved pulp are produced and bamboo pulp have respective the strengths and weaknesses, 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, least, humidity absorption and release etc.It can thus be appreciated that find out a kind of modified technique to prepare dissolving pulp by composite modified for two kinds of raw materials, make up respective shortcoming, it is very necessary for retaining respective advantage.
Application number is 200610020971.8, and Authorization Notice No. is CN1844497, and authorized announcement date is that the patent of invention on October 11st, 2006 discloses a kind of composite cellulose pulp by wood, cotton mixture manufacturing and manufacture method thereof.Composite cellulose pulp is made by any two kinds or the two or more raw-material any combination of velveteen, timber, fiber crops, bamboo wood, digesting technoloy is wherein: cotton employing soda process, wood adopt sulfate process or sulfite cooking, add 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, and boiling first vacuumizes, intensification number of times>=1 time, little steam bleeding number of times>=0 time, maximum temperature≤200 DEG C of at every turn heating up, and each to heat up, temperature retention time≤800 minute.The present invention proposes the new approaches of New Viscose Fibre pulp and production thereof, effectively advantage that is cotton, wood fiber raw material can be put together, select the essence, discarding dross, there is provided and be satisfied with viscose and show that different performance, different class are to the needs of pulp material, and expand the source of raw material, reduce 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, use that artificial amount is large, security is not high, thus causes its production efficiency low.Its cooking liquor is than being 1:1.0 ~ 9.5, and cooking liquor is than large, and the liquid that need heat is many, thus causes energy consumption high.The digesting apparatus heat transference efficiency used is low, thus causes cooking homogeneities poor, and digester cycle is long.
Application number is 200810044655.3, Authorization Notice No. is CN101333778, authorized announcement date 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: carry out the preliminary treatment such as cotton linter shredding, cyclonic separation and dedusting, feeding, the process of two roller defibrination with two roller fiberizer to cotton linter; . oxygen extraction with steam: adopt transverse tube even steam device, by the effect of high temperature, alkali, oxygen or hydrogen peroxide, realizes continuous, quick, oligosaprobic preparation and dissolves cotton pulp.Transverse tube even steam device comprises pre-reaction feed bin, two roller meter, feeding serew, T-shaped pipe, steam pipe and cold spraying device.Cut-out after the present invention effectively realizes cotton linter dry raw material preparation, tear the destruction with cell primary wall, in cotton linter a large amount of impurity physics, chemistry remove, the fast prompt drop of cotton linter in even steam device is poly-gathers the cellulosic purification of carapax et plastruw testudinis kind with fast prompt drop, 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, if compound material is carried out modification by method provided by the invention prepare dissolving pulp, the quality index of modified dissolving pulp 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 patent of invention: 1, raw material is single, and the dissolving pulp performance produced is single, show that individual character is not given prominence to.2, single raw material has respective shortcoming, 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 a kind of cotton and the composite modified digesting technoloy for dissolving pulp of true qualities wood pulp, this digesting technoloy can by cotton composite modified with true qualities wood pulp be dissolving pulp, and the viscose dissolving pulp prepared by this digesting technoloy modification is compared with similar viscose Cotton Pulp or wood pulps, its quality index all can meet the requirement of viscose pulp, and steady quality, yield is higher, thus widened the range of choice of raw material, reduce production cost, its boiling efficiency is high, digester cycle is short, cooking homogeneities, energy consumption be low.
For achieving the above object, the technical solution used in the present invention is:
Cotton paper is starched, true qualities bamboo pulp and true qualities wood pulp composite modified be the digesting technoloy of dissolving pulp, it is characterized in that: comprise twice boiling, first time boiling be used for independent boiling get the raw materials ready after cotton paper slurry, the using compound pulp of the true qualities wood pulp after second time boiling is used for the cotton paper slurry of boiling after first time is digested and gets the raw materials ready and the true qualities bamboo pulp after getting the raw materials ready, second time boiling uses continuous steamer to carry out boiling, the steam pipe of described continuous steamer is set to 3 sections, one section that is connected with pre-reaction feed bin is provided with the T-shaped pipe adding alkali lye and the steam pipe adding steam, other two sections are equipped with the steam pipe adding steam.
Described first time boiling 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: 23 ~ 28%; Liquor ratio 1:2.1 ~ 3.2, cooking liquor initial temperature 20 ~ 32 DEG C, heats up 160 ~ 180 minutes in advance, to 130-170 DEG C, insulation running 100-180 minute, little venting within adopting three times, holding temperature 140 ~ 152 DEG C, 320 ~ 380 minutes digester cycle time.
Described cotton paper slurry its quality index after first time boiling is: fine content >=90% of cotton paper slurry first, whiteness >=30%, degree of polymerization 1000-1500DP, ash content≤0.71%.
The digesting technoloy of second time boiling requires as follows:
Liquor ratio: 1:2.5 ~ 3.2;
Alkali lye is added by 32 ~ 35% of oven dry weight;
The vapor (steam) temperature of one section be connected with pre-reaction feed bin of described steam pipe is 110 ± 3 DEG C;
The vapor (steam) temperature of middle one section is 155 ± 3 DEG C;
The vapor (steam) temperature of one section that is connected with cold spraying device is 180 ~ 185 DEG C;
Compression ratio: 1:2 ~ 3.0.
Described cotton, true qualities wood pulp and true qualities bamboo pulp are composited according to the following ratio, cotton: true qualities wood pulp: true qualities bamboo pulp=20% ~ 30%:30% ~ 40%:30% ~ 50%.
Described alkali lye is NaOH and Na 2sO 3mixed solution, its mixed proportion is: NaOH:Na 2sO 3=95% ~ 98%:2% ~ 5%.
The using compound pulp of described cotton, true qualities bamboo pulp and true qualities wood pulp adopts the method for dry raw material preparation to get the raw materials ready before boiling.
The concrete technology condition of described dry raw material preparation is: a, paper pulp input amount >=4 ton/batch, b, add NaOH solution by 13 ~ 30% of fiber oven dry weight, C, liquor ratio 1:2.0 ~ 5.0.
The present invention has the following advantages:
1, the present invention adopts cotton, true qualities bamboo pulp and the composite modified of true qualities wood pulp are dissolving pulp, overcome by single cotton modified bamboo pulp yield lower, bamboo pulp alpha-cellulose content is unstable, average fiber length is lower than papermaking xylon, production process ash content, pentosan content is 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, performance is dull, show the defect that individual character is not given prominence to and be modified as the cost of wood pulps with single true qualities wood pulp high, Application Range is narrow, the defect of welding, adopt the dissolving pulp of digesting technoloy modification provided by the invention and similar viscose Cotton Pulp, bamboo pulp, wood pulps is compared, the fine content of its first, whiteness, viscosity is about the same, meet the standard of viscose dissolving pulp, be applicable to long and short fiber.
2, because raw material of the present invention is cotton, true qualities bamboo pulp and true qualities wood pulp, its degree of polymerization is all about the same, and in continuous steamer during boiling, liquor ratio is 1:2.0 ~ 4.0; Alkali lye NaOH and Na 2sO 3, add by 17 ~ 30% of oven dry weight; The vapor (steam) temperature of one section be connected with pre-reaction feed bin of steam pipe is 105 ± 5 DEG C, and the vapor (steam) temperature of middle a section is 140 ± 5 DEG C, and the vapor (steam) temperature of a section that is connected with cold spraying device is 150 DEG C ~ 175 DEG C; Compression ratio: 1:2 ~ 3.Liquor ratio is more than 1:4.0, and continuous steamer will be caused to consume energy greatly, and serious wastes the energy.Steam pipe 3 sections of vapor (steam) temperatures ensure that the abundant boiling of two kinds of raw materials, avoid a kind of raw material and cross the generation that the defect of boiling owed by the another kind of raw material of boiling, thus the quality index of dissolving pulp prepared by two kinds of compound material modifications and single Cotton Pulp or wood pulps about the same, meet instructions for use.Alkali lye is NaOH and Na 2sO 3, add by 17 ~ 30% of oven dry weight, improve the adding of alkali lye continuously cooking cooking quality, make boiling more even, and black liquor amount is little, is conducive to environmental protection.
3, the dissolving pulp that modification of the present invention prepares not only has the advantage of wood pulps but also has the advantage of bamboo pulp, performance variation, shows that individual character is given prominence to.Because cooking process adopts continuous steamer to carry out boiling, and the steam pipe of boiling vessel is provided with 3 sections, and to the boiling of using compound pulp heat stepwise, and boiling temperature improves gradually.When utilizing digesting technoloy boiling provided by the invention like this, cost is low, energy consumption is low, floor space is little, manually little, security is high, cooking quality is high, black liquor amount is little.
Detailed description of the invention
Embodiment 1
A, cotton pulp stock preparation
Cotton paper pulpboard is disperseed by cotton paper pulpboard dispersal device such as bale opener, hello dregs of rice machine, leaflet cutter etc., with cutting equipment and disintegrating apparatus as pulper, pulpboard is ground into cotton-shaped by pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped cotton paper pulpboard is sent in steamer, in the process sending into steamer, drop into cotton paper pulpboard and 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.
The cotton pulp stock preparation concrete technology of the present embodiment requires as follows:
Cotton paper pulpboard specification: 600 × 800mm.
Feed dregs of rice speed: 100Kg/min.
Feed of crusher frequency: < 5/time.
Fibre length after broken: length > 1.5mm.
After broken, fibre length is less than 0.5mm ratio: < 5%
Wadding fibrous bulking intensity: 1000g/L.
Yield: > 98%.
Adopt the advantage of this stock method: place of getting the raw materials ready is flexible, can realize do mechanization operation, reduces labour intensity, all, reaction speed is fast, yield is high, and cooking quality is good in liquid mixing.If adopt this stock method to get the raw materials ready, alkali lye will be added when continuous steamer.
Independent boiling starched by B, cotton paper:
Adopt sulphite process to carry out boiling, the digesting apparatus of selection is steamer, and digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 28%; Liquor ratio 1:2.1, cooking liquor initial temperature 20 DEG C, pre-intensification 160 minutes, to 130 DEG C, insulation running 100 minutes, little venting within adopting three times, holding temperature 140 DEG C, 320 minutes digester cycle time.
C, true qualities bamboo paper pulpboard are got the raw materials ready
True qualities bamboo paper pulpboard dispersal device such as bale opener, pulpboard such as bamboo paper such as bleaching such as hello dregs of rice machine, leaflet cutter etc. are disperseed, pulpboard is ground into cotton-shaped with cutting equipment and disintegrating apparatus such as pulper, pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped true qualities bamboo pulp plate is sent in digesting apparatus, before feeding digesting apparatus, in the process sending into digesting apparatus, drop into raw material and 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:
Bamboo pulp plate gauge lattice: 600 × 800mm.
Feed dregs of rice speed: 60Kg/min.
Disintegrating machine feeding number: < 5.
Fibre length after broken: length > 1mm.
After broken, fibre length is less than 0.5mm ratio: < 10%
Wadding fibrous bulking intensity: 200g/L.
Yield: > 95%.
D, true qualities wood pulp plate are got the raw materials ready
True qualities bamboo paper pulpboard dispersal device such as bale opener, hello dregs of rice machine, leaflet cutter etc. are disperseed true qualities bamboo paper pulpboard, pulpboard is ground into cotton-shaped with cutting equipment and disintegrating apparatus such as pulper, pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped true qualities bamboo pulp plate is sent in digesting apparatus, before feeding digesting apparatus, in the process sending into digesting apparatus, drop into raw material and 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 wood pulp is as follows:
Wood pulp plate gauge lattice: 600 × 800mm.
Feed dregs of rice speed: 60Kg/min.
Disintegrating machine feeding number: < 5.
Fibre length after broken: length > 1mm.
After broken, fibre length is less than 0.5mm ratio: < 10%
Wadding fibrous bulking intensity: 200g/L.
Yield: > 95%.
E, with conveying worm or belt conveyor, step B, C and D finish mix are sent to continuous steamer and carry out boiling, the steam pipe of continuous steamer is set to 3 sections, one section that is connected with pre-reaction feed bin is provided with the T-shaped pipe adding alkali lye and the steam pipe adding steam, and other two sections are equipped with the steam pipe adding steam.Digesting technoloy requires as follows:
Liquor ratio: 1:2.5;
Alkali lye is added by 32% of oven dry weight;
The vapor (steam) temperature of one section be connected with pre-reaction feed bin of described steam pipe is 110 DEG C;
The vapor (steam) temperature of middle one section is 155 DEG C;
The vapor (steam) temperature of one section that is connected with cold spraying device is 180 DEG C;
Compression ratio: 1:2.
Described cotton, true qualities wood pulp and true qualities bamboo pulp are composited according to the following ratio, cotton: true qualities wood pulp: true qualities bamboo pulp=20%:30%:50%.
Described alkali lye is NaOH and Na 2sO 3mixed solution, its mixed proportion is: NaOH:Na 2sO 3=95%:5%.
Blowing after F, boiling, carry out washing, bleach, acid treatment, concentrated, removal of impurities, operation of manufacturing paper with pulp.
Its quality index of dissolving pulp prepared through the present embodiment modification is as shown in the table:
First is fine The degree of polymerization Whiteness Ash content Yield
88—93% 500—800 78—88% 0.1—0.2% 75—85%
Embodiment 2
A, cotton pulp stock preparation
Cotton paper pulpboard is disperseed by cotton paper pulpboard dispersal device such as bale opener, hello dregs of rice machine, leaflet cutter etc., with cutting equipment and disintegrating apparatus as pulper, pulpboard is ground into cotton-shaped by pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped cotton paper pulpboard is sent in steamer, in the process sending into steamer, drop into cotton paper pulpboard and 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.
The cotton pulp stock preparation concrete technology of the present embodiment requires as follows:
Cotton paper pulpboard specification: 600 × 800mm.
Feed dregs of rice speed: 100Kg/min.
Feed of crusher frequency: < 5/time.
Fibre length after broken: length > 1.5mm.
After broken, fibre length is less than 0.5mm ratio: < 5%
Wadding fibrous bulking intensity: 1000g/L.
Yield: > 98%.
Adopt the advantage of this stock method: place of getting the raw materials ready is flexible, can realize do mechanization operation, reduces labour intensity, all, reaction speed is fast, yield is high, and cooking quality is good in liquid mixing.If adopt this stock method to get the raw materials ready, alkali lye will be added when continuous steamer.
Independent boiling starched by B, cotton paper:
Adopt sulphite process to carry out boiling, the digesting apparatus of selection is steamer, and digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 28%; Liquor ratio 1:3.2, cooking liquor initial temperature 32 DEG C, pre-intensification 180 minutes, to 170 DEG C, insulation running 180 minutes, little venting within adopting three times, holding temperature 152 DEG C, 380 minutes digester cycle time.
C, true qualities bamboo paper pulpboard are got the raw materials ready
True qualities bamboo paper pulpboard dispersal device such as bale opener, pulpboard such as bamboo paper such as bleaching such as hello dregs of rice machine, leaflet cutter etc. are disperseed, pulpboard is ground into cotton-shaped with cutting equipment and disintegrating apparatus such as pulper, pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped true qualities bamboo pulp plate is sent in digesting apparatus, before feeding digesting apparatus, in the process sending into digesting apparatus, drop into raw material and 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:
Bamboo pulp plate gauge lattice: 600 × 800mm.
Feed dregs of rice speed: 100Kg/min.
Disintegrating machine feeding number: < 5.
Fibre length after broken: length > 1mm.
After broken, fibre length is less than 0.5mm ratio: < 10%
Wadding fibrous bulking intensity: 800g/L.
Yield: > 95%.
D, true qualities wood pulp plate are got the raw materials ready
True qualities bamboo paper pulpboard dispersal device such as bale opener, hello dregs of rice machine, leaflet cutter etc. are disperseed true qualities bamboo paper pulpboard, pulpboard is ground into cotton-shaped with cutting equipment and disintegrating apparatus such as pulper, pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped true qualities bamboo pulp plate is sent in digesting apparatus, before feeding digesting apparatus, in the process sending into digesting apparatus, drop into raw material and 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 wood pulp is as follows:
Wood pulp plate gauge lattice: 600 × 800mm.
Feed dregs of rice speed: 100Kg/min.
Disintegrating machine feeding number: < 5.
Fibre length after broken: length > 1mm.
After broken, fibre length is less than 0.5mm ratio: < 10%
Wadding fibrous bulking intensity 800g/L.
Yield: > 95%.
E, with conveying worm or belt conveyor, step B, C and D finish mix are sent to continuous steamer and carry out boiling, the steam pipe of continuous steamer is set to 3 sections, one section that is connected with pre-reaction feed bin is provided with the T-shaped pipe adding alkali lye and the steam pipe adding steam, and other two sections are equipped with the steam pipe adding steam.Digesting technoloy requires as follows:
Liquor ratio: 1:3.2;
Alkali lye is added by 35% of oven dry weight;
The vapor (steam) temperature of one section be connected with pre-reaction feed bin of described steam pipe is 113 DEG C;
The vapor (steam) temperature of middle one section is 158 DEG C;
The vapor (steam) temperature of one section that is connected with cold spraying device is 185 DEG C;
Compression ratio: 1:3.0.
Described cotton, true qualities wood pulp and true qualities bamboo pulp are composited according to the following ratio, cotton: true qualities wood pulp: true qualities bamboo pulp=30%:30%:40%.
Described alkali lye is NaOH and Na 2sO 3mixed solution, its mixed proportion is: NaOH:Na 2sO 3=98%:2%.
Blowing after F, boiling, carry out washing, bleach, acid treatment, concentrated, removal of impurities, operation of manufacturing paper with pulp.
Its quality index of dissolving pulp prepared through the present embodiment modification is as shown in the table:
First is fine The degree of polymerization Whiteness Ash content Yield
89—94% 500—800 76—86% 0.1—0.2% 75—85%
Embodiment 3
A, cotton pulp stock preparation
Cotton paper pulpboard is disperseed by cotton paper pulpboard dispersal device such as bale opener, hello dregs of rice machine, leaflet cutter etc., with cutting equipment and disintegrating apparatus as pulper, pulpboard is ground into cotton-shaped by pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped cotton paper pulpboard is sent in steamer, in the process sending into steamer, drop into cotton paper pulpboard and 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.
The cotton pulp stock preparation concrete technology of the present embodiment requires as follows:
Cotton paper pulpboard specification: 600 × 800mm.
Feed dregs of rice speed: 80Kg/min.
Feed of crusher frequency: < 5/time.
Fibre length after broken: length > 1.5mm.
After broken, fibre length is less than 0.5mm ratio: < 5%
Wadding fibrous bulking intensity: 800g/L.
Yield: > 98%.
Adopt the advantage of this stock method: place of getting the raw materials ready is flexible, can realize do mechanization operation, reduces labour intensity, all, reaction speed is fast, yield is high, and cooking quality is good in liquid mixing.If adopt this stock method to get the raw materials ready, alkali lye will be added when continuous steamer.
Independent boiling starched by B, cotton paper:
Adopt sulphite process to carry out boiling, the digesting apparatus of selection is steamer, and digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 25%; Liquor ratio 1:3, cooking liquor initial temperature 30 DEG C, pre-intensification 170 minutes, to 150 DEG C, insulation running 150 minutes, little venting within adopting three times, holding temperature 150 DEG C, 360 minutes digester cycle time.
C, true qualities bamboo paper pulpboard are got the raw materials ready
True qualities bamboo paper pulpboard dispersal device such as bale opener, pulpboard such as bamboo paper such as bleaching such as hello dregs of rice machine, leaflet cutter etc. are disperseed, pulpboard is ground into cotton-shaped with cutting equipment and disintegrating apparatus such as pulper, pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped true qualities bamboo pulp plate is sent in digesting apparatus, before feeding digesting apparatus, in the process sending into digesting apparatus, drop into raw material and 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:
Bamboo pulp plate gauge lattice: 600 × 800mm.
Feed dregs of rice speed: 80Kg/min.
Disintegrating machine feeding number: < 5.
Fibre length after broken: length > 1mm.
After broken, fibre length is less than 0.5mm ratio: < 10%
Wadding fibrous bulking intensity: 500g/L.
Yield: > 95%.
D, true qualities wood pulp plate are got the raw materials ready
True qualities bamboo paper pulpboard dispersal device such as bale opener, hello dregs of rice machine, leaflet cutter etc. are disperseed true qualities bamboo paper pulpboard, pulpboard is ground into cotton-shaped with cutting equipment and disintegrating apparatus such as pulper, pulverizer, with conveying equipment (blower fan, cyclone separator, conveying worm), cotton-shaped true qualities bamboo pulp plate is sent in digesting apparatus, before feeding digesting apparatus, in the process sending into digesting apparatus, drop into raw material and 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 wood pulp is as follows:
Wood pulp plate gauge lattice: 600 × 800mm.
Feed dregs of rice speed: 90Kg/min.
Disintegrating machine feeding number: < 5.
Fibre length after broken: length > 1mm.
After broken, fibre length is less than 0.5mm ratio: < 10%
Wadding fibrous bulking intensity 700g/L.
Yield: > 95%.
E, with conveying worm or belt conveyor, step B, C and D finish mix are sent to continuous steamer and carry out boiling, the steam pipe of continuous steamer is set to 3 sections, one section that is connected with pre-reaction feed bin is provided with the T-shaped pipe adding alkali lye and the steam pipe adding steam, and other two sections are equipped with the steam pipe adding steam.Digesting technoloy requires as follows:
Liquor ratio: 1:3.1;
Alkali lye is added by 32 ~ 35% of oven dry weight;
The vapor (steam) temperature of one section be connected with pre-reaction feed bin of described steam pipe is 108 DEG C;
The vapor (steam) temperature of middle one section is 154 DEG C;
The vapor (steam) temperature of one section that is connected with cold spraying device is 182 DEG C;
Compression ratio: 1:2.2.
Described cotton, true qualities wood pulp and true qualities bamboo pulp are composited according to the following ratio, cotton: true qualities wood pulp: true qualities bamboo pulp=25%:35%:40%.
Described alkali lye is NaOH and Na 2sO 3mixed solution, its mixed proportion is: NaOH:Na 2sO 3=96%:4%.
Blowing after F, boiling, carry out washing, bleach, acid treatment, concentrated, removal of impurities, operation of manufacturing paper with pulp.
Its quality index of dissolving pulp prepared through the present embodiment modification is as shown in the table:
First is fine The degree of polymerization Whiteness Ash content Yield
89—94% 500—800 76—86% 0.1—0.2% 75—85%
Can be drawn by above-described embodiment, adopt digesting technoloy of the present invention, the mixed pulp of cotton, true qualities bamboo pulp and true qualities wood pulp can be modified as dissolving pulp, and the quality index of the quality index of part dissolving pulp and Cotton Pulp, wood pulps is about the same.
Applicant adopted existing digesting technoloy papermaking wood pulp being modified as wood pulps time mixed pulp that is cotton and true qualities wood pulp is modified as dissolving pulp, found by test, adopt existing digesting technoloy, quality index after digested is fine % whiteness >=81, content≤80.0 % of first, degree of polymerization 500-800, yield 75-85%, the quality requirement of national standard to dissolving pulp can not be met at all, and adopt digesting technoloy bamboo pulp being modified as bamboo pulp, quality index after digested is fine content≤89 % of first, whiteness≤78 %, degree of polymerization 500-800, yield 75-85%, the quality requirement of national standard to dissolving pulp can not be met.

Claims (6)

1. cotton paper slurry, true qualities bamboo pulp and true qualities wood pulp composite modified be the digesting technoloy of dissolving pulp, it is characterized in that: comprise twice boiling, first time boiling be used for independent boiling get the raw materials ready after cotton paper slurry, the using compound pulp of the true qualities wood pulp after second time boiling is used for the cotton paper slurry of boiling after first time is digested and gets the raw materials ready and the true qualities bamboo pulp after getting the raw materials ready, second time boiling uses continuous steamer to carry out boiling, the steam pipe of described continuous steamer is set to 3 sections, one section that is connected with pre-reaction feed bin is provided with the T-shaped pipe adding alkali lye and the steam pipe adding steam, other two sections are equipped with the steam pipe adding steam.
2. cotton paper according to claim 1 slurry, true qualities bamboo pulp and true qualities wood pulp are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described first time boiling adopts sulphite process to carry out boiling, the digesting apparatus selected is steamer, digestant is sodium sulfite+NaOH, and process conditions are: sulfite cooking liquid total alkali consumption: 23 ~ 28%; Liquor ratio 1:2.1 ~ 3.2, cooking liquor initial temperature 20 ~ 32 DEG C, heats up 160 ~ 180 minutes in advance, to 130-170 DEG C, insulation running 100-180 minute, little venting within adopting three times, holding temperature 140 ~ 152 DEG C, 320 ~ 380 minutes digester cycle time.
3. cotton paper according to claim 1 and 2 slurry, true qualities bamboo pulp and true qualities wood pulp are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described cotton paper slurry its quality index after first time boiling is: fine content >=90% of cotton paper slurry first, whiteness >=30%, degree of polymerization 1000-1500DP, ash content≤0.71%.
4. cotton paper according to claim 1 and 2 slurry, true qualities bamboo pulp and true qualities wood pulp are composite modified be the digesting technoloy of dissolving pulp, it is characterized in that: the digesting technoloy requirement of second time boiling is as follows:
Liquor ratio: 1:2.5 ~ 3.2;
Alkali lye is added by 32 ~ 35% of oven dry weight;
The vapor (steam) temperature of one section be connected with pre-reaction feed bin of described steam pipe is 110 ± 3 DEG C;
The vapor (steam) temperature of middle one section is 155 ± 3 DEG C;
The vapor (steam) temperature of one section that is connected with cold spraying device is 180 ~ 185 DEG C;
Compression ratio: 1:2 ~ 3.0.
5. cotton paper according to claim 1 slurry, true qualities bamboo pulp and true qualities wood pulp are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described cotton, true qualities wood pulp and true qualities bamboo pulp are composited according to the following ratio, cotton: true qualities wood pulp: true qualities bamboo pulp=20% ~ 30%:30% ~ 40%:30% ~ 50%.
6. cotton paper according to claim 4 slurry, true qualities bamboo pulp and true qualities wood pulp are composite modified is the digesting technoloy of dissolving pulp, it is characterized in that: described alkali lye is NaOH and Na 2sO 3mixed solution, its mixed proportion is: NaOH:Na 2sO 3=95% ~ 98%:2% ~ 5%.
CN201410744557.6A 2014-12-09 2014-12-09 Cooking process for compound modification of cotton paper pulp, natural color bamboo paper pulp and natural color wood paper pulp into dissolving pulp Pending CN104532639A (en)

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CN102677508A (en) * 2012-05-29 2012-09-19 宜宾长毅浆粕有限责任公司 Cooking process for carrying out composite modification on natural color bamboo paper pulp and natural color wood pulp to form dissolving pulp
CN102677507A (en) * 2012-05-29 2012-09-19 宜宾长毅浆粕有限责任公司 Cooking process for carrying out composite modification on natural color bamboo paper pulp and cotton paper pulp to form dissolving pulp

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1844497A (en) * 2006-05-08 2006-10-11 宜宾丝丽雅股份有限公司 Cotton and wood composite cellulose pulp and method for producing same
CN1861848A (en) * 2006-05-08 2006-11-15 宜宾丝丽雅股份有限公司 Cotton wood hemp bamboo composite cellulose pulp and mfg. process thereof
CN1865549A (en) * 2006-05-08 2006-11-22 宜宾丝丽雅股份有限公司 Cotton-wood-bamboo composite cellulose pulp and method for producing same
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Application publication date: 20150422