CN102677506A - Cooking process for carrying out composite modification on bleached bamboo paper pulp and natural color wood pulp to form dissolving pulp - Google Patents

Abstract

The invention discloses a cooking process for carrying out composite modification on bleached bamboo paper pulp and natural color wood pulp to form dissolving pulp. 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; alkali liquor is added into the continuous steaming pipe by the T-shaped pipe; and the alkali liquor is NaOH solution and is added according to 17 percent to 23 percent of the oven dry weight. According to the invention, the bleached bamboo paper pulp and the natural color wood 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

Bleaching bamboo pulp and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp

Technical field

The present invention relates to bleach that bamboo pulp and true qualities wood pulp are composite modified is the method for dissolving pulp; Relate in particular to and use bleaching bamboo pulp and the composite modified digesting technoloy of true qualities wood pulp as dissolving pulp; Wherein, dissolving pulp is meant the pulp that viscose, cellulose acetate and cellulose derivative are used.

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 the papermaking level wood-pulp board, 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, heated up in advance 10-15 minute, to 105 ± 5 ℃; 4, stop behind the vapour dry run 25-30 minute again; 5, adopt 3 times with interior little steam bleeding; 6, holding temperature 135-172 ℃, in the 2 hours total times of heating up.Digesting technoloy provided by the invention has added digestant; Boiling is even and digesting technoloy is various; Papermaking level wood paddle board gathers effect through having obtained behind this digesting technoloy to purify to fall preferably; Each item index of the wood pulps that this invention makes at last can match in excellence or beauty with cotton pulp dregs of rice index with similar viscose, thereby has reduced production cost.But China is a country that timber is in great shortage, and the production cost that is modified as wood pulps with papermaking level wood paddle board is higher, and the viscose of producing with single wood pulps, and performance is dull, shows that individual character do not give prominence to.

And application number is 200910263444.3, and Granted publication number is CN101736637A, and 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 the bamboo pulp modification prepares bamboo dissolved pulp; Step is after discongesting, not float true qualities bamboo pulp, after thickening, sends into the double helix roller type paste mill, in machine, continues dehydration; And the adding soup, slurry in machine, accomplish continue to concentrate, rub, the soup mixed processes, then slurry is transported to boiling vessel; After finishing, boiling gets into the subsequent handling that comprises washing, bleaching; Until manufacturing paper with pulp, wherein cooking schedule is: go out double helix roller type paste mill slurry temperature: 40-95 ℃, get into the boiling vessel temperature: 40-80 ℃; Liquor ratio: 1:3.0-7.0, bunker amount: 150-250kg over dry slurry/m ³, the intensification condition: the pan feeding temperature is warmed up to 120 ℃, time 30-60min, 120 ℃ of insulation 30-120min, venting 5-20min; Continue to be warmed up to 140-145 ℃, heating-up time 30-60min, at 140-145 ℃, insulation 120-180min; Insulation finishes and continues to be warmed up to 165-170 ℃, insulation 30-180min, and insulation finishes, the cooling blowing; Blowing is after the 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 production cost to a great extent, and having enlarged resource provisioning source and this law, to produce the alpha-cellulose content of bamboo pulp of preparation higher, is applicable to the production of long or short filament viscose.But there is following shortcoming in the bamboo pulp of this invention preparation: 1, yield is lower, and the highest yield is merely 85%.2, the alpha-cellulose content fluctuation is bigger, and from 85% to 95%, the bamboo pulp alpha-cellulose content that makes modification come out is unstable.3, average fiber length is lower than the 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, have air in the cell and cause dissolving difficulty, chemical industry consumption big.4, the viscose produced of single bamboo pulp, performance is dull, shows that individual character is outstanding.

Above-mentioned papermaking level needlebush pulpboard modified technique with utilize true qualities not float the bamboo pulp modification to prepare wood pulps and the bamboo pulp that the production method of bamboo dissolved pulp produces and have the strengths and weaknesses separately; Performance has nothing in common with each other; Have their own characteristics each, like the deflection of skin affinity, fiber, antibacterial bacteriostatic function, fiber soft feeling property, deodorization property, gas permeability, coloring, bounce-back property, humidity absorption and release property etc.Hence one can see that finds out a kind of modified technique with two kinds of composite modified preparation dissolving pulps of raw material, remedies shortcoming separately, and the advantage that keeps separately is very necessary.

Application number is 200610020971.8, and Granted publication number is CN1844497, and it is a kind of by wood, the cotton composite cellulose pulp and the manufacturing approach thereof of producing of mixing Granted publication day to be that the patent of invention on October 11st, 2006 discloses.Composite cellulose pulp is made by any two kinds of perhaps two or more raw-material combination in any of velveteen, timber, fiber crops, bamboo wood; Digesting technoloy wherein is: cotton soda process, the wood of adopting adopts sulfate process or sulfite cooking, and the 5.0-35.0% that presses oven dry weight adds NaOH, Na ₂S, Na ₂SO ₃, H ₂SO ₃In one or more, liquor ratio is: 1:1.0～9.5, boiling vacuumizes earlier, intensification number of times>=1 time, little steam bleeding number of times>=0 time, heat up, temperature retention time≤800 minute in maximum temperature≤200 ℃ of at every turn heating up at every turn.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, different class needs, and enlarged the source of raw material, reduced the production cost of viscose with pulp to the pulp raw material.But the digesting apparatus that the digesting technoloy that this invention relates to adopts is rotary spherical digester, upright pot or boiling vessel, and its unit equipment yields poorly, uses that artificial amount is big, security is not high, thereby causes its production efficiency low.Its cooking liquor is than being 1:1.0～9.5, and cooking liquor needs liquid heated many than big, thereby causes energy consumption high.Employed digesting apparatus heat transference efficiency is low, thereby causes the boiling lack of homogeneity, 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: the cotton linter preliminary treatment: cotton linter is carried out preliminary treatment such as cotton linter shredding, cyclonic separation and dedusting, feeding, the processing of two roller defibrination with two roller fiberizers; Oxygen is separated to connect and is steamed: adopt transverse tube to connect and steam device, through the effect of high temperature, alkali, oxygen or hydrogen peroxide solution, realize continuous, quick, oligosaprobic preparation dissolving cotton pulp.Transverse tube even steams device and comprises pre-reaction feed bin, two roller meter, feeding serew, T type pipe, connects and steam pipe and cold spraying device.The present invention effectively realize behind the cotton linter dry raw material preparation cut-out, tear the destruction with the cell primary wall; The physics of a large amount of impurity, chemistry are removed in the cotton linter; Cotton linter gathers with fast prompt drop and gathers the cellulosic purification of carapax et plastruw testudinis kind connecting the fast prompt drop steam in the device; The recycling of used heat in the production link, the problems such as reduction of COD total amount in the black liquor, and also boiling is even, digester cycle short.But this invention only is applicable to the cotton linter modification is prepared into viscose, if come modification to prepare dissolving pulp with method provided by the invention compound material, the quality index of the dissolving pulp after the modification does not reach the requirement of dissolving pulp, and power consumption is high, 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 of producing is single, show that individual character is outstanding.2, single raw material all has shortcoming separately, and production cost is high or yield is low, unstable product quality.3, production equipment falls behind, power consumption is high, half steaming is even.

Summary of the invention

In order to overcome above-mentioned defective; The invention provides and a kind ofly bleach that bamboo pulp and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp, this digesting technoloy can with the bleaching bamboo pulp composite modified with the true qualities wood pulp be dissolving pulp, and compare with the cotton pulp dregs of rice or wood pulps with similar viscose through the viscose dissolving pulp that this digesting technoloy modification prepares; Its quality index all can satisfy viscose and use the pulp requirement; And steady quality, yield is higher, thereby has widened the range of choice of raw material; Reduced production cost, its boiling efficiency is high, digester cycle is short, boiling is even, energy consumption is low.

For realizing above-mentioned purpose, the technical scheme that the present invention adopts is:

Bleaching bamboo pulp and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp; It is characterized in that: using compound pulp is sent into tubular continuous digester carry out boiling; The company of said continuous steamer steams pipe and is made as 3 sections; One section that links to each other with the pre-reaction feed bin is provided with T shape pipe that adds alkali lye and the steam pipe that adds steam, and other two sections are equipped with the steam pipe that adds steam, and its digesting technoloy requires as follows:

Liquor ratio: 1:2.0～4.0;

Press 17～23% of oven dry weight and add alkali lye;

Said one section the vapor (steam) temperature that links to each other with the pre-reaction feed bin that connects the steaming pipe is 105 ± 5 ℃;

Middle one section vapor (steam) temperature is 140 ± 5 ℃;

One section the vapor (steam) temperature that links to each other with cold spraying device is 150 ℃～175 ℃;

Compression ratio: 1:2～3.0.

Said alkali lye is NaOH.

Said bleaching bamboo pulp, true qualities wood pulp are composited by following proportioning, bleaching bamboo pulp: true qualities wood pulp=40%～60%:40%～60%.

The fine content of said bleaching bamboo pulp first>=89%, the degree of polymerization＞800DP, ash≤0.45%, whiteness＞80%, the fine content of said true qualities wood pulp first>=80%, the degree of polymerization＞1000DP, ash≤2%, whiteness＞30%.

The using compound pulp of said bleaching bamboo pulp and the true qualities wood pulp method of before boiling, getting the raw materials ready adopts dry raw material preparation or wet feed preparation.

The concrete process conditions of said dry raw material preparation are: rate of feeding: 30-70 open pulpboard/minute; Add alkali number (with fiber oven-dry weight percentage) 13 ~ 19%, liquor ratio 1:1.0 ~ 1.5.

The process conditions of said wet feed preparation are: 4 tons/crowdes of a, paper pulp input amount, and b, cold alkali pulping slurry are dense: 2%～10%, c, take off liquid disposed slurry mass dryness fraction >=20%, the dNaOH consumption: be 13% of over dry material weight, e, liquor ratio: 1:2.0 ~ 5.0.

The present invention has the following advantages:

1, the present invention adopts the using compound pulp of bleaching bamboo pulp and true qualities wood pulp to be modified as dissolving pulp; Overcome with single bleaching bamboo pulp modification bamboo pulp pentose, ash content is higher and whiteness is relatively poor defective; Fine low with the cost height, the first that are modified as wood pulps with single true qualities wood pulp; The defective of not having antibiotic effect; The advantage that the dissolving pulp that adopts digesting technoloy provided by the invention to prepare has a bamboo pulp has the advantage of wood pulps again, and low cost of manufacture, the fine content height of first, pentose, ash content is low and the whiteness advantages of higher.

2, to be modified as the method that the boiling of dissolving pulp adopts be to carry out boiling with continuous steamer to the present invention's mixed pulp that will bleach bamboo pulp and true qualities wood pulp; 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 that the digestion process power consumption is low, and boiling is even.Compression ratio is limited to 1:2.0～3.0, is guaranteeing under the uniform prerequisite of boiling, makes and the maximization of boiling amount has improved production capacity.Connecting first section temperature that feeds steam of steaming pipe is 105 ± 5 ℃, and middle one section is 140 ± 5 ℃, and the 3rd section is 145 ℃～170 ℃; Using compound pulp is the boiling that progressively heats up in continuous steamer, and the feeding amount of steam comes surely according to liquor ratio, and liquor ratio is big more; The valve of steam regulation pipe; Increase the feeding amount of steam, the adjusting boiling temperature that the temperature through steam and the feeding amount of steam can be in good time, thus avoid the mistake boiling and owed the generation of boiling.Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, and the 17%-23% that presses oven dry weight adds; The addition of alkali lye is limited to the 17%-23% of oven dry weight, can obtain good cooking effect, makes that the using compound pulp boiling is even, cooking speed is fast; And cooking liquor makes full use of, and after the boiling, the waste liquid of generation is few; Help the reduction and the environmental protection of cost, further reduced the generation at night.

3, bleaching bamboo pulp of the present invention: true qualities wood pulp=40%～60%:40%～60%, such mixed finished product pulp shaping evenness is good, and intensity is high, and first is fine 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 the alkali lye utilization rate is bigger, and night, generation was less.

4, the raw materials quality index choice can guarantee that the quality index of finished product dissolving pulp reaches requirement, the particularly requirement of the content of first fibre, if be lower than said standard, the fine content of the first of finished product dissolving pulp is difficult to reach requirement.

5, the present invention's mixed pulp that can just bleach bamboo pulp and true qualities wood pulp is modified as dissolving pulp; The quality index of the quality index of the dissolving pulp after the modification and the cotton pulp dregs of rice or wood pulps is about the same, satisfies instructions for use, and method is simple; The black liquor amount is little; Be easy to control, production cost is low, and the material choice scope is wide.

The specific embodiment

The invention provides and a kind ofly will bleach that bamboo pulp and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp; Said bleaching bamboo pulp: true qualities wood pulp=40%～60%:40%～60%; Compound according to the above ratio using compound pulp is sent into continuous steamer carry out boiling, the company of said continuous steamer steams pipe and is provided with 3 sections, and one section that joins with the pre-reaction feed bin is provided with steam pipe and manages with T shape; Other two sections are provided with steam pipe, cooking schedule: liquor ratio: 1:2.0～4.0; One section temperature that feeds steam of joining with the pre-reaction feed bin of compression ratio: 1:2.0～3.0: Lian Zhengguan is: 105 ± 5 ℃; Middle one section temperature that feeds steam is: 140 ± 5 ℃, one section temperature that feeds steam of joining with cold spraying device is: 145 ℃～170 ℃; Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, and the 17%-23% that presses oven dry weight adds.

The present invention adopts the using compound pulp of bleaching bamboo pulp and true qualities wood pulp to be modified as dissolving pulp; Overcome with single bleaching bamboo pulp modification bamboo pulp pentose, ash content is higher and whiteness is relatively poor defective; Single bleaching needlebush pulp modifying is high as the cost of wood pulps, first is fine low with using; The defective of not having antibiotic effect; The advantage that the dissolving pulp that adopts digesting technoloy provided by the invention to prepare has a bamboo pulp has the advantage of wood pulps again, and low cost of manufacture, the fine content height of first, pentose, ash content is low and the whiteness advantages of higher.It is to carry out boiling with continuous steamer that the mixed pulp that the present invention will bleach bamboo pulp and true qualities wood pulp is modified as the method that the boiling method of dissolving pulp adopts; 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 that the digestion process power consumption is low, and boiling is even.Compression ratio is limited to 1:2.0～3.0, is guaranteeing under the uniform prerequisite of boiling, makes and the maximization of boiling amount has improved production capacity.Connecting first section temperature that feeds steam of steaming pipe is 105 ± 5 ℃, and middle one section is 140 ± 5 ℃, and the 3rd section is 145 ℃～170 ℃; Using compound pulp is the boiling that progressively heats up in continuous steamer, and the feeding amount of steam comes surely according to liquor ratio, and liquor ratio is big more; The valve of steam regulation pipe; Increase the feeding amount of steam, the adjusting boiling temperature that the temperature through steam and the feeding amount of steam can be in good time, thus avoid the mistake boiling and owed the generation of boiling.Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, and the 17%-23% that presses oven dry weight adds; The addition of alkali lye is limited to the 17%-23% of oven dry weight, can obtain good cooking effect, makes that the using compound pulp boiling is even, cooking speed is fast; And cooking liquor makes full use of, and after the boiling, the waste liquid of generation is few; Help the reduction and the environmental protection of cost, further reduced the generation at night.

For the quality index that guarantees the finished product dissolving pulp reaches requirement, the particularly requirement of the content of first fibre, the fine content of said bleaching bamboo pulp first>=89%; The degree of polymerization＞800DP, ash≤0.45%, whiteness＞80%; The fine content of said true qualities wood pulp first>=80%; The degree of polymerization＞1000DP, ash≤2%, whiteness＞30%.

The processing step that the using compound pulp that the present invention will bleach bamboo pulp and true qualities wood pulp is modified as dissolving pulp is:

Get the raw materials ready, boiling, washing, removal of impurities, bleaching, secondary washing, copy the dregs of rice; Owing to the present invention is to provide and a kind ofly will bleach that bamboo pulp and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp; Its main improvement is cooking process; Other process adopts existing method to get final product, and also can adopt the method for embodiment provided by the invention.

Embodiment 1

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 40%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are following:

Rate of feeding: 30-70 open pulpboard/minute;

Add alkali number (with fiber oven-dry weight percentage) 13 ~ 19%;

Liquor ratio 1:1.0 ~ 1.5.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.0;

Compression ratio: 1:2.0:

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 100 ℃;

Middle one section temperature that feeds steam is: 135 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 150 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 17% of oven dry weight and adds.

C, washing:

Adopt the 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, make the concentration of high underflow be reduced to 2.5%, adds washing assisant Busperse 2838 then, and consumption is 1 kilogram of/ton slurry, mixes 30 minutes, gets by carrying stock pump, gets into I section wash engine;

B carries out spray washing by the black liquor that II section black liquor groove provides, and the black liquor after the washing gets into I section black liquor groove, and I section black liquor channel black liquid temp is 72 ℃;

C starches subsequently and gets into II section wash engine, carries out spray washing by the washing reuse plain boiled water of III section black liquor groove, and the cleaning solution after washing gets into II section filtrate tank and for the preceding paragraph pulp grinder washings is provided;

D starches at last and gets into III section wash engine, carries out spray washing by the cleaning solution that adds, and the cleaning solution after washing gets into III section filtrate tank, and the slurry after the washing gets into the slurry tower.

D, removal of impurities:

E, bleaching

Compound pulp is sent into the Bellmer of transferring behind the alkali carry out sodium hypochlorite bleaching, after dechlorination, acid treatment, promptly accomplish bleaching, technological parameter is following:

Transfer alkali number: 20-200g/m ³

Clorox consumption: 0.1-0.6g/l;

The hypo consumption: the 1.8-2 of residual chlorine doubly;

Acid treatment: hydrochloric acid consumption 1-4%, calgon consumption 0.5-2%, consumption of oxalic acid 0.5-2%.

F, secondary washing:

G, copy the dregs of rice:

The technological parameter of copying dregs of rice operation comprises: 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, 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.

Quality index is after the present embodiment boiling: the fine content of first＞87%, whiteness＞50%, viscosity＞12, mpa.s, yield＞78%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞90 %, whiteness＞80%, viscosity＞10 mpa.s, yield＞75%.

Embodiment 2

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 40%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, send into digesting apparatus before, cotton-shaped using compound pulp is fully immersed in the NaOH solution.This method of getting the raw materials ready becomes wet feed preparation in this area.Present embodiment adopts this method of getting the raw materials ready to get the raw materials ready.

Its concrete steps are: adopt dispersal device (bale opener, feed dregs of rice machine, pulper, fluffer) → join alkali device → mixing arrangement (stain is soaked bucket) → dewatering device (squeezer, press master) → reducing mechanism (pulverizer) → transport (conveying worm, belt conveyor) → will expect in the input cooking liquor.

It is dense 2%～10% that 4 tons/crowdes of its process conditions: a, paper pulp input amount, b, cold alkali pulping starch, and c, takes off liquid disposed slurry mass dryness fraction>=20%, d goal alkali number (with fiber oven-dry weight percentage) 13%; E, liquor ratio 1:2.0 ~ 5.0, f, quality index require: the fine content of bleaching bamboo pulp first>=89%, the degree of polymerization＞800DP; Ash≤0.45%, whiteness＞80%, the fine content of true qualities wood pulp first>=80%; The degree of polymerization＞1000DP, ash≤2%, whiteness＞30%.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.5;

Compression ratio: 1:2.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 105 ℃;

Middle one section temperature that feeds steam is: 140 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 160 ℃;

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation all identical with embodiment 1.

Compound paddle board quality index is after the present embodiment boiling: the fine content of first＞91%, whiteness＞54%, viscosity＞11.5 mpa.s, yield＞80%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞94 %, whiteness＞82 %, viscosity＞9.8mpa.s, yield＞78%.

Embodiment 3

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 40%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete technology of the dry raw material preparation that present embodiment adopts is identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:3.0;

Compression ratio: 1:2.5:

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 170 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 20% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞92%, whiteness＞60%, viscosity＞11.0 mpa.s yield＞82%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞94%, whiteness＞83 %, viscosity＞9.5 mpa.s, yield＞80%.

Embodiment 4

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 40%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:4.0;

Compression ratio: 1:3.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 175 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 23% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞90.6% whiteness＞66%, viscosity＞10.8 mpa.s, yield＞83%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞91.8 %, whiteness＞84 %, viscosity＞9.2mpa.s, yield＞82 %.

Embodiment 5

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 45%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.0;

Compression ratio: 1:2.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 100 ℃;

Middle one section temperature that feeds steam is: 135 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 150 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 17% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞90.8%, whiteness＞69%, viscosity＞10.5mpa.s, yield＞82.6%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞92%, whiteness＞84 %, viscosity＞9.0 mpa.s, yield＞81.7%.

Embodiment 6

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 45%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, send into digesting apparatus before, cotton-shaped using compound pulp is fully immersed in the NaOH solution.This method of getting the raw materials ready becomes wet feed preparation in this area.Present embodiment adopts this method of getting the raw materials ready to get the raw materials ready.

Its concrete steps are: adopt dispersal device (bale opener, feed dregs of rice machine, pulper, fluffer) → join alkali device → mixing arrangement (stain is soaked bucket) → dewatering device (squeezer, press master) → reducing mechanism (pulverizer) → transport (conveying worm, belt conveyor) → will expect in the input cooking liquor.

It is dense 2%～10% that 4 tons/crowdes of its process conditions: a, paper pulp input amount, b, cold alkali pulping starch, and c, takes off liquid disposed slurry mass dryness fraction>=20%, d goal alkali number (with fiber oven-dry weight percentage) 13%; E, liquor ratio 1:2.0 ~ 5.0, f, quality index require: the fine content of bleaching bamboo pulp first>=89%, the degree of polymerization＞800DP; Ash≤0.45%, whiteness＞80%, the fine content of true qualities wood pulp first>=80%; The degree of polymerization＞1000DP, ash≤2%, whiteness＞30%.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.5;

Compression ratio: 1:2.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 105 ℃;

Middle one section temperature that feeds steam is: 140 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 160 ℃;

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation all identical with embodiment 1.

Compound paddle board quality index is after the present embodiment boiling: the fine content of first＞93%, whiteness＞60%, viscosity＞11 mpa.s, yield＞80%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞95 %, whiteness＞82 %, viscosity＞9.8mpa.s, yield＞78%.

Embodiment 7

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 45%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete technology of the dry raw material preparation that present embodiment adopts is identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:3.0;

Compression ratio: 1:2.5:

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 170 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 20% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞94%, whiteness＞72%, viscosity＞11.0 mpa.s yield＞89%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞96%, whiteness＞80 %, viscosity＞9.5 mpa.s, yield＞80%.

Embodiment 8

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 40%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:4.0;

Compression ratio: 1:3.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 175 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 23% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞92% whiteness＞72%, viscosity＞10.8 mpa.s, yield＞83%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞94%, whiteness＞84 %, viscosity＞9.2mpa.s, yield＞82 %.

Embodiment 9

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 50%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.0;

Compression ratio: 1:2.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 100 ℃;

Middle one section temperature that feeds steam is: 135 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 150 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 17% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞92%, whiteness＞74%, viscosity＞10.5mpa.s, yield＞82.6%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞94%, whiteness＞84 %, viscosity＞9.0 mpa.s, yield＞81.7%.

Embodiment 10

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 50%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, send into digesting apparatus before, cotton-shaped using compound pulp is fully immersed in the NaOH solution.This method of getting the raw materials ready becomes wet feed preparation in this area.Present embodiment adopts this method of getting the raw materials ready to get the raw materials ready.

Its concrete steps are: adopt dispersal device (bale opener, feed dregs of rice machine, pulper, fluffer) → join alkali device → mixing arrangement (stain is soaked bucket) → dewatering device (squeezer, press master) → reducing mechanism (pulverizer) → transport (conveying worm, belt conveyor) → will expect in the input cooking liquor.

It is dense 2%～10% that 4 tons/crowdes of its process conditions: a, paper pulp input amount, b, cold alkali pulping starch, and c, takes off liquid disposed slurry mass dryness fraction>=20%, d goal alkali number (with fiber oven-dry weight percentage) 13%; E, liquor ratio 1:2.0 ~ 5.0, f, quality index require: the fine content of bleaching bamboo pulp first>=89%, the degree of polymerization＞800DP; Ash≤0.45%, whiteness＞80%, the fine content of true qualities wood pulp first>=80%; The degree of polymerization＞1000DP, ash≤2%, whiteness＞30%.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.5;

Compression ratio: 1:2.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 105 ℃;

Middle one section temperature that feeds steam is: 140 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 160 ℃;

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation all identical with embodiment 1.

Compound paddle board quality index is after the present embodiment boiling: the fine content of first＞94%, whiteness＞74%, viscosity＞11 mpa.s, yield＞80%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞96%, whiteness＞82%, viscosity＞9.8mpa.s, yield＞78%.

Embodiment 11

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 50%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete technology of the dry raw material preparation that present embodiment adopts is identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:3.0;

Compression ratio: 1:2.5:

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 170 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 20% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞95%, whiteness＞68%, viscosity＞10 mpa.s yield＞89%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞96%, whiteness＞78 %, viscosity＞9.5 mpa.s, yield＞80%.

Embodiment 12

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 40%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:4.0;

Compression ratio: 1:3.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 175 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 23% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞95% whiteness＞68%, viscosity＞10.8 mpa.s, yield＞83%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞96%, whiteness＞84 %, viscosity＞9.2mpa.s, yield＞82 %.

Embodiment 13

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 60%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.0;

Compression ratio: 1:2.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 100 ℃;

Middle one section temperature that feeds steam is: 135 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 150 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 17% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞91%, whiteness＞78%, viscosity＞10.5mpa.s, yield＞82.6%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞94%, whiteness＞82%, viscosity＞9.0 mpa.s, yield＞81.7%.

Embodiment 14

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 50%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, send into digesting apparatus before, cotton-shaped using compound pulp is fully immersed in the NaOH solution.This method of getting the raw materials ready becomes wet feed preparation in this area.Present embodiment adopts this method of getting the raw materials ready to get the raw materials ready.

Its concrete steps are: adopt dispersal device (bale opener, feed dregs of rice machine, pulper, fluffer) → join alkali device → mixing arrangement (stain is soaked bucket) → dewatering device (squeezer, press master) → reducing mechanism (pulverizer) → transport (conveying worm, belt conveyor) → will expect in the input cooking liquor.

It is dense 2%～10% that 4 tons/crowdes of its process conditions: a, paper pulp input amount, b, cold alkali pulping starch, and c, takes off liquid disposed slurry mass dryness fraction>=20%, d goal alkali number (with fiber oven-dry weight percentage) 13%; E, liquor ratio 1:2.0 ~ 5.0, f, quality index require: the fine content of bleaching bamboo pulp first>=89%, the degree of polymerization＞800DP; Ash≤0.45%, whiteness＞80%, the fine content of true qualities wood pulp first>=80%; The degree of polymerization＞1000DP, ash≤2%, whiteness＞30%.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:2.5;

Compression ratio: 1:2.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 105 ℃;

Middle one section temperature that feeds steam is: 140 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 160 ℃;

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation all identical with embodiment 1.

Compound paddle board quality index is after the present embodiment boiling: the fine content of first＞93%, whiteness＞68%, viscosity＞11 mpa.s, yield＞80%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞96%, whiteness＞82%, viscosity＞9.8mpa.s, yield＞78%.

Embodiment 15

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 50%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete technology of the dry raw material preparation that present embodiment adopts is identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:3.0;

Compression ratio: 1:2.5:

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 170 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 20% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞96%, whiteness＞69%, viscosity＞10 mpa.s yield＞89%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞97%, whiteness＞82 %, viscosity＞9.5 mpa.s, yield＞80%.

Embodiment 16

A, get the raw materials ready:

The bleaching bamboo pulp is accounted for the compound pulpboard that mixes pulpboard 40%; For example bale opener, hello dregs of rice machine, leaflet cutter etc. disperse the mixed paper pulpboard with dispersal device; 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 compound pulpboard is sent in the digesting apparatus, in sending into the process of digesting apparatus, added cooking liquor (NaOH) while drop into raw material; This kind method this area of getting the raw materials ready is called as dry raw material preparation, and the method for getting the raw materials ready of present embodiment adopts this kind method of getting the raw materials ready.

The concrete process conditions of the dry raw material preparation that present embodiment adopts are identical with embodiment 1.

B, boiling:

The cotton-shaped compound pulpboard of steps A being processed with conveying worm or belt conveyor is sent to continuous steamer and carries out boiling.During boiling, raw material is squeezed into the pre-reaction feed bin, let raw material in the pre-reaction feed bin, send into Lian Zhengguan again after abundant the mixing and carry out boiling; When boiling, steam pipe through T shape Guan Xianglian and feed alkali lye, steam pipe input steam through steam pipe to connecting; Utilize steam to the using compound pulp boiling of heating, when boiling, the rotation that spiral does not stop; Using compound pulp is fully contacted with steam, and boiling is even.The workman can be according to the liquor ratio feeding amount of condition steam at any time, thus the control boiling temperature.

Present embodiment adopts cooking schedule following:

Liquor ratio: 1:4.0;

Compression ratio: 1:3.0;

One section temperature that feeds steam of joining with the pre-reaction feed bin of connect steaming pipe is: 110 ℃;

Middle one section temperature that feeds steam is: 145 ℃;

One section temperature that feeds steam of joining with cold spraying device is: 175 ℃;

Steam pipe through T shape Guan Xianglian and add alkali lye, alkali lye is NaOH, presses 23% of oven dry weight and adds.

C, washing; D, removal of impurities; E, bleaching; F, secondary washing; G, to copy dregs of rice operation identical with embodiment 1.

Quality index is after the present embodiment boiling: the fine content of first＞94% whiteness＞70%, viscosity＞10.8 mpa.s, yield＞83%.

The quality index of the dissolving pulp that the process present embodiment is processed is: the fine content of first＞98%, whiteness＞84 %, viscosity＞9.2mpa.s, yield＞82 %.

 

Can draw through the foregoing description, adopt digesting technoloy of the present invention, can the mixed pulp of bleaching bamboo pulp and true qualities wood pulp be modified as dissolving pulp, and the requirement of the equal National standard of quality index of the dissolving pulp for preparing.

The using compound pulp that the applicant will bleach bamboo pulp and true qualities wood pulp adopted the existing digesting technoloy that the papermaking wood pulp is modified as wood pulps when being modified as dissolving pulp; Find through test, adopt existing wood pulps or cotton pulp dregs of rice digesting technoloy, boiling quality index later is the fine content of first＜88%; Whiteness＞85%; Viscosity＞11.0 mpa.s yield＞82% can not satisfy the quality requirement of national standard to dissolving pulp at all, and adopts the digesting technoloy that bamboo pulp is modified as bamboo pulp; Boiling quality index later is the fine content of first＜89%; Whiteness＞81%, viscosity＞11.5 mpa.s yield＞81% can not satisfy the quality requirement of national standard to dissolving pulp.

Claims (7)

1. bleaching bamboo pulp and true qualities wood pulp are composite modified is the digesting technoloy of dissolving pulp; It is characterized in that: using compound pulp is sent into tubular continuous digester carry out boiling; The company of said continuous steamer steams pipe and is made as 3 sections; One section that links to each other with the pre-reaction feed bin is provided with T shape pipe that adds alkali lye and the steam pipe that adds steam, and other two sections are equipped with the steam pipe that adds steam, and its digesting technoloy requires as follows:

Liquor ratio: 1:2.0～4.0;

Press 17～23% of oven dry weight and add alkali lye;

Said one section the vapor (steam) temperature that links to each other with the pre-reaction feed bin that connects the steaming pipe is 105 ± 5 ℃;

Middle one section vapor (steam) temperature is 140 ± 5 ℃;

One section the vapor (steam) temperature that links to each other with cold spraying device is 150 ℃～175 ℃;

Compression ratio: 1:2～3.0.

2. bleaching bamboo pulp according to claim 1 and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp, it is characterized in that: said alkali lye is NaOH solution.

3. bleaching bamboo pulp according to claim 1 and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp; It is characterized in that: said bleaching bamboo pulp, true qualities wood pulp are composited by following proportioning, bleaching bamboo pulp: true qualities wood pulp=40%～60%:40%～60%.

4. composite modified according to claim 1 or 3 described bleaching bamboo pulps and true qualities wood pulp is the digesting technoloy of dissolving pulp, it is characterized in that: the fine content of said bleaching bamboo pulp first>=89%, the degree of polymerization＞800DP; Ash≤0.45%; Whiteness＞80%, the fine content of said true qualities wood pulp first>=80%, the degree of polymerization＞1000DP; Ash≤2%, whiteness＞30%.

5. bleaching bamboo pulp according to claim 1 and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp, it is characterized in that: the using compound pulp of said bleaching bamboo pulp and the true qualities wood pulp method of before boiling, getting the raw materials ready adopts dry raw material preparation or wet feed preparation.

6. bleaching bamboo pulp according to claim 5 and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp, it is characterized in that: the concrete process conditions of said dry raw material preparation are: rate of feeding: 30-70 open pulpboard/minute; Add alkali number (with fiber oven-dry weight percentage) 13 ~ 19%, liquor ratio 1:1.0 ~ 1.5.

7. bleaching bamboo pulp according to claim 5 and true qualities wood pulp are composite modified to be the digesting technoloy of dissolving pulp; It is characterized in that: the process conditions of said wet feed preparation are: 4 tons/batches of a, paper pulp input amounts; B, cold alkali pulping are starched dense: 2%～10%; C, take off liquid disposed slurry mass dryness fraction >=20%, the dNaOH consumption: be 13% of over dry material weight, e, liquor ratio: 1:2.0 ~ 5.0.