CN101787661A - Textbook paper for elementary and secondary school students and preparation method thereof - Google Patents

Abstract

The invention provides textbook paper for elementary and secondary school students; the pulp material of the textbook paper of the elementary and secondary school students includes 20-100% of unbleached straw pulp and 0-80% of wood pulp. The textbook paper of the elementary and secondary school students has the fixed quantity of 52-80g /m2, and the opacity is more than or equal to 82%, the fracture length is 2.5-5.5km and the whiteness is 35-60% ISO. The production process of the textbook paper of the elementary and secondary school students not only saves energy sources and cost, but also can greatly reduce the emission of pollutants.

Description

A kind of students in middle and primary schools' textbook paper for elementary and secondary and preparation method thereof

Technical field

What the present invention relates to is the application of a kind of grass type un-bleaching pulp on preparation students in middle and primary schools textbook paper for elementary and secondary, and specifically, what the present invention relates to is a kind of students in middle and primary schools' textbook paper for elementary and secondary and preparation method thereof, belongs to the pulping and paper-making field.

Background technology

Printing typically refers to offset printing paper, offset paper, students in middle and primary schools' textbook paper for elementary and secondary etc.

From performance, they should have certain mechanical strength, protection against the tide, waterproof etc.Prior art has been made disclosing of some technical schemes to printing, and is specific as follows:

CN91104434 discloses a kind of water proof and wearable coating body paper of hectographic printing or production method of coated paper of being used for.In bodystock paper is produced, be raw material with straw pulp or wood pulp, join slurry stream gives or the top sizing process in add waterproofing agent, and dry maturation process.In coated paper is produced, adopt one side to be coated with waterproofing agent to non-water proof and wearable coating body paper, another side is coated with water resistant coating, or the two-sided method that is coated with water resistant coating; To the water proof and wearable body paper, adopt the method that is coated with water resistant coating, the drying maturation process obtains coating body paper or coated paper.The present invention has simple to operate, improves the advantage of paper water proof and wearable performance and wet strength.

CN200610077972 discloses a kind of method of utilizing herbaceous plant and crop stalk and mineral powder to produce paper pulp, and it is characterized in that the steps in sequence that comprises is: (1) herbaceous plant and crop stalk are pulverized, and granularity is 450～40 orders; (2) processing of straw powder; (3) straw powder after will handling and granularity are that 40～14 purpose mineral powders are gone into mixer and stirred; (4) the mixture after being mixed water filling is formed suspension, pouring out suspension separates with mineral powder, again suspension is promptly got original paper pulp one time through 100～60 purpose sieve screens, utilize this paper pulp can make printing paper, cellophane paper, printing paper, students in middle and primary schools' textbook paper for elementary and secondary, wrapping paper, cardboard etc.

It is herb slurry or based on scratch brushing painting processing paper and the manufacture method thereof of straw pulp that CN96109173 discloses body paper.The 50g/m that body paper is quantitative ²-100g/m ², straw pulp content 70%-100%, but utilize this body paper through the coating brushing compound, hot calendered makes glossiness after slim paper brush machine scratch brushing ornamenting is handled and can reach more than 50%, and print gloss reaches the straw pulp brush coating printing paper more than 70%.

CN88102368 discloses a kind of technology of making coating printing paper, its feature is to make the interior no wood pulp composition of paper pulp of this paper, but match in appropriate ratio by under certain condition cotton linter pulp and straw pulp of control respectively, add again that the system of copying after a certain proportion of anionic starch mixes forms.

CN87101416 discloses and has a kind ofly made the high filler paper technology of fibrous raw material with grass, wood pulp, and its technological process is making beating (grass, wood pulp mix) → add gauze → whitewater closures such as Witcodur 272, aluminium carbonate, talcum powder letterweight press for extracting juice → oven dry → top sizing → dry → be processed into paper that circulate → copy.With the paper of this explained hereafter, detect the back filler and contain allowance more than 35% (percentage by weight).This paper technology is applicable to the production of cultural papers such as students in middle and primary schools' textbook paper for elementary and secondary, coating body paper, students in middle and primary schools' textbook paper for elementary and secondary, facing paper.

CN97105618 discloses a kind of method of straw pulp by neutral ammonium sulfite process production students in middle and primary schools textbook paper for elementary and secondary, comprise get the raw materials ready, boiling, screening, washing, purification, concentrate, bleach, pull an oar, join slurry, copy paper, press polish, coiling process, when characteristics are boiling, liquor ratio is 1: 2-2.5, imonium consumption 15-17%, buffer consumption 2-3%, 0.75-0.8MPa is pressed in boiling, boiling temperature 160-175 ℃, be incubated 2-2.5 hour, steam and separate hardness 10-12k value, residual imonium 8-10g/l, raffinate pH 〉=7, the fiber of this technology gained can be produced students in middle and primary schools' textbook paper for elementary and secondary.

CN200410059633.6 discloses a kind of preparation method of chromatics paper, the technical characterictic of this method is at first wheat straw to be pulverized, in wheat straw fiber, add sodium sulfite, NaOH and anthracene Kun, and fully mix, said mixture is placed on boiling becomes pulp in the water, the slurry of boiling is sieved, to remove coarse impurities; Add liquid chlorine, NaOH, clorox in the slurry after boiling, heat so that slurry is bleached, slurry is pulverized, making its beating degree is 30, adds alkaline bright yellow, acid purple, aluminum sulfate, gum rosin and hydrosulfurous acid oil in slurry, thin up paper pulp, to adjust the color of paper pulp, according to finished product paper thickness requirement, paper pulp is layered on the forming web heat drying.

In sum, the dogstail slurry that existing fibers in grass class pulp and paper technology is produced reduces greatly through bleaching back intensity, and water filtering performance is poor, is not suitable for producing high-grade paper product; Before manufacturing paper with pulp, add dyestuff or pigment in the bleached pulp, not only increased the direct production cost of papermaking, and because the adding of dyestuff or pigment has increased cost of sewage disposal and intractability.How to improve production technology; reduce energy consumption and pollution; produce high-quality dogstail slurry; be main slurry with high-quality dogstail slurry then; the eyesight that can protect the people of manufacturing paper with pulp out can be saved high-grade students in middle and primary schools' textbook paper for elementary and secondary of cost again significantly; prior art does not provide better way, in view of this, and special proposition the present invention.

Summary of the invention

Primary and foremost purpose of the present invention is to provide a kind of students in middle and primary schools' textbook paper for elementary and secondary, and described students in middle and primary schools' textbook paper for elementary and secondary comprises the wood pulp that does not float straw pulp and 0-80% of 20-100% mainly due to used slurry.

Another object of the present invention is to provide a kind of preparation method of students in middle and primary schools' textbook paper for elementary and secondary, this method simple possible, the prepared students in middle and primary schools' textbook paper for elementary and secondary quality height that goes out.

A further object of the present invention is to provide a kind of application of not floating straw pulp at preparation students in middle and primary schools textbook paper for elementary and secondary

To achieve these goals, the technical solution used in the present invention is:

A kind of students in middle and primary schools' textbook paper for elementary and secondary, the whiteness of described students in middle and primary schools' textbook paper for elementary and secondary are 30-75%ISO, and the used slurry of described students in middle and primary schools' textbook paper for elementary and secondary comprises the wood pulp that do not float that does not float straw pulp and 0-80% of 20-100%.

The fracture length of students in middle and primary schools' textbook paper for elementary and secondary of the present invention is 2.3-5.5km, and preferred described fracture length is 3.0-5.5km.

The opacity of students in middle and primary schools' textbook paper for elementary and secondary of the present invention is 80-98%, and preferred described opacity is 82-98%, and more preferably described opacity is 86-98%.

The folding strength of students in middle and primary schools' textbook paper for elementary and secondary of the present invention is 4-45 time, and preferred described horizontal folding strength is 8-45 time, and more preferably described horizontal folding strength is 10-45 time.

Students in middle and primary schools' textbook paper for elementary and secondary of the present invention, wherein, described students in middle and primary schools' textbook paper for elementary and secondary whiteness is 35-76%ISO, preferred described whiteness is 45-76%ISO, more preferably 50-75%ISO.

Fibre length mean value 〉=the 0.6mm that does not float straw pulp of the present invention, preferred fibre length mean value 〉=0.8mm.

The straw pulp fracture length that do not float of the present invention is 3.0-7.5km, and tearability is 170-280mN, and whiteness is 35-45%ISO, and folding number is 20-90 time, and beating degree is 26-34 ° of SR; Preferred fracture length is that 5.0-6.5km, tearability are that 200-280mN, folding number are that 25-90 time, beating degree are 28-32 ° of SR.

The preparation method of students in middle and primary schools' textbook paper for elementary and secondary of the present invention, wherein, the preparation of students in middle and primary schools' textbook paper for elementary and secondary comprises the steps:

(1) straw pulp is not floated in preparation;

(2) wood pulp of selling on straw pulp, the market that do not float that step (1) is obtained is pulled an oar respectively, the slurry after obtaining pulling an oar.

(3) after the making beating that step (2) is obtained do not float straw pulp and the making beating after wood pulp, with 20-100% even, obtain mixed slurry with mixed 80-0%.

(4) slurry that mixes that step (3) is obtained is manufactured paper with pulp, and obtains described students in middle and primary schools' textbook paper for elementary and secondary.

Preparation method of the present invention, wherein, straw pulp is not floated in the described preparation of step (1), and its raw material comprises wheat straw, straw, cotton stalk, giantreed, reed etc., with their one or more combination.

Preparation method of the present invention, wherein, straw pulp is not floated in the described preparation of step (1), and its boiling method comprises a kind of in ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method.

Preparation method of the present invention, wherein, straw pulp is not floated in the described preparation of step (1), and its boiling vessel comprises continuous steamer, batch (-type) spherical boiler, the upright pot of boiling.

Preparation method of the present invention, wherein, straw pulp is not floated in the described preparation of step (1), and its preparation method can be traditional pulping process, can be the method for oxygen delignification, can also be alkali treatment method.

Described traditional pulping process be meant adopt general boiling and comb is separated, the washing process preparation do not float straw pulp, pulping process and technology are known in those skilled in the art.

The method of described oxygen delignification, its technical process comprises:

Chaffcutter-dedusting-boiling-shove-comb is separated-oxygen delignification.

Described chaffcutter is meant the grass section that raw material is cut into 1.5-2.5cm; Chaffcutter machinery can be the known machineries of present technique field personnel, can be to have the chaffcutter machinery that rolls and cut off function simultaneously, can be the hammer Straw-crumbling machine, preferably uses the hammer Straw-crumbling machine.

Described dedusting is meant impurity such as the grain of removing in the forage, careless joint, dust, and cleaner and technology are conventionally known to one of skill in the art.

Described boiling is meant that the fine fodder after the dedusting is put into boiling vessel carries out boiling, and described boiling comprises a kind of in ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method:

During described ammonium sulfite boiling, the consumption of ammonium sulfite is the 9-13% to the over dry material quantity;

During described anthraquinone-soda cooking, alkali charge in NaOH to over dry material quantity 9-15%;

During described kraft cooking, alkali charge is that the NaOH meter is to over dry material quantity 8-11%;

During described alkaline sodium sulfite method boiling, sodium hydroxide concentration is counted 11-15% with the over dry raw material weight, and the sodium sulfite consumption is the 2-6% of over dry raw material weight.

1) in batch (-type) spherical boiler or continuous steamer during boiling:

Described ammonium sulfite boiling comprises:

(1) add cooking liquor in the grass kind plant raw material, wherein the ammonium sulfite consumption is the 9-13% to the over dry material quantity, and liquor ratio is 1: 2-9;

(2) feed steam and heat, heat temperature raising is to temperature 165-173 ℃, intensifications, little venting, insulation whole process time 30-220 minute;

Described anthraquinone-soda cooking comprises:

(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge in NaOH to over dry material quantity 9-15%, liquor ratio is 1: 2-9, the anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity;

(2) feed steam and heat, heat temperature raising is to temperature 160-165 ℃, intensifications, little venting, insulation whole process time 30-220 minute;

Described kraft cooking comprises:

(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge be the NaOH meter to over dry material quantity 8-11%, liquor ratio is 1: 2-9, sulphidity are 5-8%;

(2) feed steam and heat, heat temperature raising is to temperature 165-173 ℃, intensifications, little venting, insulation whole process time 30-220 minute;

The boiling of described alkaline sodium sulfite method comprises:

(1) in the dogstail raw material, adds steaming preparation, wherein, sodium hydroxide concentration is counted 11-15% with the over dry raw material weight, and the sodium sulfite consumption is the 2-6% of over dry raw material weight, the consumption of anthraquinone is the 0.02-0.08% of over dry raw material weight, and the cooking liquor ratio is 1: 3-9;

(2) feed steam and heat, heat temperature raising is to temperature 160-165 ℃, intensifications, little venting, insulation whole process time 30-220 minute;

2) in vertical digester during boiling:

Described ammonium sulfite boiling is:

(1) add cooking liquor in the grass kind plant raw material, wherein the ammonium sulfite consumption is the 9-15% to the over dry material quantity, and liquor ratio is 1: 6-10;

(2) described grass kind plant raw material is packed in the digester by packer by hot black liquor, after the dress pot is full, close pot cover, replenishing temperature in the digester is 130-145 ℃ of steaming preparation, discharge the air in the pot simultaneously and boost to 0.6-0.75MPa, cooking liquor is warming up to 156-173 ℃, heats up, is incubated and be replaced into 220 minutes; Put with pump at last slurry is delivered to spraying pot;

Described anthraquinone-soda cooking is:

(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge in NaOH to over dry material quantity 9-17%, liquor ratio is 1: 6-9, the anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity;

(2) described grass kind plant raw material is packed in the digester by packer by hot black liquor, after the dress pot is full, close pot cover, replenishing temperature in the digester is 130-145 ℃ of steaming preparation, discharge the air in the pot simultaneously and boost to 0.4-0.6MPa, cooking liquor is warming up to 147-165 ℃, heat up, be incubated and be replaced into 170-200 minute, put with pump at last slurry is delivered to spraying pot;

Described kraft cooking is:

(1) in the grass kind plant raw material, add cooking liquor, wherein alkali charge be the NaOH meter to over dry material quantity 8-13%, liquor ratio is 1: 6-10, sulphidity are 5-9%;

(2) described grass kind plant raw material is packed in the digester by packer by hot black liquor, after the dress pot is full, close pot cover, replenishing temperature in the digester is 130-145 ℃ of steaming preparation, discharge the air in the pot simultaneously and boost to 0.5-0.65MPa, cooking liquor is warming up to 155-168 ℃, heat up, be incubated and be replaced into 180-220 minute, put with pump at last slurry is delivered to spraying pot;

The boiling of described alkaline sodium sulfite method comprises:

(1) add steaming preparation in the dogstail raw material, wherein, sodium hydroxide concentration is counted 9-17% with the over dry raw material weight, and sodium sulfite is 4-8%, and anthraquinone is 0.04-0.08%, and the cooking liquor ratio is 1: 6-10;

(2) the dogstail raw material is packed in the digester by packer by hot black liquor, after the dress pot is full, close pot cover, replenishing temperature in the digester is 145 ℃ of steaming preparations, discharge the air in the pot simultaneously and boost to 0.45-0.6MPa, cooking liquor is warming up to 152-165 ℃, heat up, be incubated and be replaced into 180-220 minute, put with pump at last slurry is delivered to spraying pot.

Described shove, shove machinery can be to well known to a person skilled in the art machinery, can also be reducing single-screw press masters, preferred reducing single-screw press master.

Described shove, the concentration of shove disposed slurry are 15-25%.

Described comb is separated, and before and after comb was separated, the beating degree numerical value of slurry raise and is not more than 5 ° of SR.

Described comb is separated, and the breaker beater tool can be the high frequency beater, can be mill, can be the known making beating machineries of those skilled in the art of the present technique.

Described oxygen delignification comprises: with obtaining hardness after the boiling is that the high-hardness pulp of permanganate number (13) 16-28 is pumped to the oxygen delignification reaction tower, and adds NaOH and oxygen; This high-hardness pulp carries out delignification reaction in this oxygen delignification reaction tower, obtain the slurry that hardness is permanganate number 10-14;

Preferred described oxygen delignification is the single hop oxygen delignification, carries out in the oxygen delignification reaction tower; Described high-hardness pulp is 95-100 ℃ in the temperature of this reaction tower import department, and pressure is 0.9-1.2MPa; The temperature in exit is 100-105 ℃, and pressure is 0.2-0.6MPa; Alkali charge is that the addition of oxygen is a 20-40kg slurry per ton in the 2-4% of NaOH to the oven dry stock amount in the described oxygen delignification; The reaction time of described high-hardness pulp in this reaction tower is 60-90 minute.

Do not float among the preparation method of straw pulp in the present invention, can at first adopt prior art that grass as raw material is got the raw materials ready, promptly adopt conventional dried, wet feed preparation, to remove impurity such as defoliation, fringe, grain, marrow, wheat, can alleviate the pressure of subsequent technique like this, and improve the quality of Straw Pulp.Dried, wet feed preparation can adopt existing conventional equipment, as chaffcutter, screening machine, dust removal machine, wet scrubbing Straw-crumbling machine, inclined screw Water Extraction Machinery etc.Dogstail raw material through the removal moisture after getting the raw materials ready also can be fine fodder, and the moisture of deduction dogstail raw material is the over dry grass, and the length of general blade is at 15-30mm, and the technology of getting the raw materials ready of raw material is technology as well known to those skilled in the art.

In the melting process in the present invention, also can utilize hammer mill to carry out dry raw material preparation, may further comprise the steps:

(1) grass prepared using hammer mill is cut off rubbing and handle, obtain cutting off the raw material after the rubbing;

The grass raw material is to hammer mill in this step, and described hammer mill comprises to be carried feeding section, fragmentation and rubbing section and break up the discharge section.The effect of being squeezed of grass raw material, cross section makes impurity such as leaf, awns, wheat, grain, marrow separate with stalk for circular grass raw material is crushed, and the grass raw material is discharged from the outlet of hammer mill.The length of the grass raw material of being discharged is 20-50mm.

Hammer mill among the present invention is the beater grinder of the existing usefulness of getting the raw materials ready.The rotating speed of described hammer mill is 500-800rpm, the speed that the grass raw material enters hammer mill is 0.5-1.3m/s, rotating speed is crossed words low or that charging is too fast, can cause some grass raw materials not crumpled fully, the infiltration of cooking liquor after the influence, and then influence pulp quality.

Grass raw material skin has one deck wax, and there is one deck marrow its bar inside, and in the general method of getting the raw materials ready, when skin was flooded by cooking liquor, wax can be removed soon, but because the internal layer of its bar has air, so cooking liquor is difficult to enter.After grass prepared using hammer mill cut off and crumple, help the abundant dipping of dogstail raw material, obtain the measured straw pulp of matter after the boiling easily.

(2) raw material that will cut off after the fragmentation carries out dust removal process;

Carry out dust removal process through the raw material after the cut-out fragmentation, this is owing to contain impurity such as dust, sandstone, blade of grass, careless fringe in the blade after cutting off, through dust removal process, above-mentioned impurity major part is removed, therefore in the digestion process after getting the raw materials ready, chemicals consumption in the time of can reducing boiling, the time of boiling also can shorten accordingly.

Carrying out dust removal machine that dust removal process adopted among the present invention can comprise roll-type dust removal machine, double cone dust removal machine and cyclone dust removal machine for the used dust removal machine of getting the raw materials ready of grass raw material in the prior art, and preferred described dust removal machine is the cyclone dust removal machine.Air quantity is 30000-38000m when carrying out dust removal process in cyclone dust collectors ³/ h, blast 210mm water column.Under such condition, can remove dust contained in the dogstail raw material in a large number, thereby alleviate the burden of follow-up boiling.

(3) will carry out Screening Treatment through the raw material of dust removal process.

The grass raw material often has foreign material such as thick blade and broken end through after the dust removal process, and in digestion process, these foreign material have is difficult for being permeated by cooking liquor, thus generation steaming separate thing; Though react with cooking liquor at the broken end that has, but black liquor viscosity is increased, influence the circulation of cooking liquor, cause half steaming, cause operating difficulties, influence the amount of black liquor extraction and the wash degree of slurry, so this step of Screening Treatment is a crucial step in the grass raw material dry raw material preparation.

Drum sieve of the present invention is the drum sieve that is used for grass raw material dry raw material preparation in the prior art.The rotating speed of described drum sieve is 18-29r/min, the inclination angle is 6-12 °, drum sieve of the present invention is a double-layer cylinder screen, the length of side of the nexine sieve plate square sieve aperture of drum sieve is 30-40mm, the diameter 4-6mm of outer sieve plate sieve aperture, in the process of this Screening Treatment, big blade and other tiny impurity such as silt, dust etc. are screened to come out, and paper pulp is clean after having guaranteed.

After the dry raw material preparation method of the present invention, the edulcoration rate of dogstail raw material reaches more than 90%, and general method to carry out the edulcoration rate of dry raw material preparation be 70%, so not only can reduce the dust in the slurry, make that prepared slurry is clean, the yield height, yield improves 3-6% than general method, reduces 2-5% with method production cost of the present invention.

Can before boiling, carry out impregnation process in the method for the present invention to raw material, maceration extract is flooded wheat straw raw material, make liquor ratio reach 1: 2-4, in insulation and mixing more than 10 minutes in the spiral macerator more than 85 ℃, wherein insulation mixes 10-40 minute for well between 85-95 ℃ under normal pressure.Maceration extract is fully contacted with wheat straw raw material, make the dipping of wheat straw raw material evenly complete.Described maceration extract can be certain density aqueous slkali, in 4% the aqueous slkali of NaOH to the over dry material quantity, also can be the mixed liquor of above-mentioned aqueous slkali and black liquor as alkali charge, and the concentration of used black liquor is 11-14 ° of Be ' (20 ℃).Raw material has been carried out impregnation process, make the temperature and the residual alkali of black liquor obtain cycling and reutilization, reduced the consumption of the energy and resource, because to the preliminary treatment of raw material dipping, make that heteroproteose cell, hemicellulose, the lignin deviate from are that main black liquid separation is discharged when heat treated, for next step boiling is got ready.The described process that raw material is carried out impregnation process belongs to preprocessing process, its main purpose be for after help the reaction of delignification in the digestion process.

In the method for the invention, after boiling finishes, spurt to spraying pot after the pressure dilution that the high-hardness pulp maintenance of gained is certain, described pressure is 0.75MPa.Dilution can be the used black liquor of aforementioned impregnation process.The concentration of the high-hardness pulp in the spraying pot is 8-15% at this moment, hardness is equivalent to card uncle valency 26-50 for permanganate number 16-28, be connected by delivery pump between spraying pot and the acroll press washer, delivery pump is transported to the high-hardness pulp in the spraying pot inlet of acroll press washer, high-hardness pulp enters from the inlet of acroll press washer, through after the shove, above-mentioned high-hardness pulp is sent from the outlet of press master, the concentration of the slurry of sending is brought up to 20-28% by 8-15%, become the high-hardness pulp of high concentration, temperature is 70-80 ℃.In shove, most of black liquor is extruded the back and stores in the black liquor groove.Selected press master is to extract the acroll press washer that black liquor is used in the prior art, is preferably single-screw press master or the Double screw pulp extruder and the Var-nip press of reducing varying pitch.

When using press master to carry out shove, because the process at shove can produce very big extruding force, temperature rises rapidly, impel fiber separation, divide silk, brooming, conquassation, primary wall is destroyed, the enough energy of fiber absorbs make fibrous inside produce very big stress, and the reactivity worth of high-hardness pulp is greatly improved.Simultaneously, fiber produces fibrillating, and impurity is dissolved in the black digestion liquid between epidermis organic matter and fiber, discharges by liquid outlet groove, and fiber fineness is greatly improved.Some ash contents in the black liquor and impurity are also along with black liquor is discharged from, for next step operation has been carried out sufficient preparation.Most preferred press master is the press master of spiral reducing among the present invention, utilizes the reducing press master, makes slurry in the space that slowly diminishes, and makes the about dehydration of compressed slurry layer consistent.The single-screw reducing press master that the present invention is selected, after high-hardness pulp was carried out shove, the beating degree of described high-hardness pulp changed little.

When carrying out shove, also can adopt Var-nip press, the use of Var-nip press, also can be the same with the single-screw press master, reduce the damage of fiber to greatest extent, and because the extraction rate of black liquor height of described Var-nip press, therefore make that water consumption significantly reduces in the subsequent washing process, water consumption is less than the single-screw press master greatly, reaches more than 20% through the concentration of high-hardness pulp after the shove, and high energy reaches 25%.

In the method for the present invention, when carrying out the washing of high-hardness pulp, resulting high concentration high-hardness pulp after resulting high-hardness pulp after the boiling or the shove dilutes in general elder generation, with concentration is that to be diluted to concentration be 2.5-3.5% for the black liquor of 11-14 ° of Be ' (20 ℃), screening technique through prior art screens as jumping the sieve screening method again, and loss is 0.2-0.5% in the screening.Next wash, can adopt vacuum pulp washing machine of the prior art or pressure washer to wash.The purpose that adopts vacuum pulp washing machine is the easier inside and outside pressure difference of fibrocyte that is formed in the washing process, so more helps the wash degree that reaches high in washing process.In order to reach higher wash degree, the number of times of washing can also can be twice or three times for once.

In the method for the present invention, after carrying out pulp washing, the concentration of slurry can be delivered to fluffer through conveying worm with this slurry and discongest processing between 9-11%, and the beating degree of handling the back slurry is 26-28 ° of SR, weight in wet base 1.5-1.7g, temperature 65-70 ℃.Described fluffer is the existing equipment of discongesting, as deflaker, and disc mill or defibrator.By discongesting, fiber can be rubbed with the hands and open, the lignin between fiber and the fiber is exposed out, helps the carrying out of the oxygen delignification step of back.

With the high-hardness pulp that obtains after the boiling or after discongesting after the slurry of gained or the pulp washing slurry of gained carry out oxygen delignification, described oxygen delignification is: alkali charge is in the 2-4% of NaOH to the oven dry stock amount, and the addition of oxygen is bleaching 60-90 minute under the condition of 20-40kg slurry per ton.The hardness k value (permanganate number) of starching this moment is reduced to 11-13 and is equivalent to card uncle valency 12.5-17, and beating degree is 32-36 ° of SR.The preferred described oxygen delignification of the present invention is the single hop oxygen delignification, use an oxygen delignification reaction tower, high-hardness pulp is 90-100 ℃ in the temperature of this reaction tower import department, and pressure is 0.9-1.2MPa, the temperature in exit is 95-105 ℃, and pressure is 0.2-0.4MPa.Adopting the single hop oxygen delignification mainly is the intensity that guarantees paper pulp for further, relative multistage oxygen delignification, and the single hop oxygen delignification is less to cellulosic degradation.Generally speaking temperature is lower for the technological parameter of the preferred single hop oxygen delignification of the present invention, comparatively speaking the time longer, mainly be for the gentle more delignification reaction that carries out, avoid cellulosic degraded as far as possible.The concentration of the preferred high-hardness pulp of the present invention before carrying out oxygen delignification is 8-18%.In carry out oxygen delignification under the dense condition.In the major advantage of dense oxygen delignification be: invest less; Since in the success of dense mixing and pumping technology, the processing of slurry is dense more much easier than high; Slurry concentration is lower, and the corrosion of equipment is few, also the danger of not burning in oxygen.

Described alkali treatment method, its technical process comprises:

Chaffcutter-dedusting-pre-preg-extruding-screening-boiling-shove-comb is separated-alkali treatment-shove '-washing

Described chaffcutter is raw material to be cut into described chaffcutter be meant the grass section that raw material is cut into 1.5-2.5mm; Chaffcutter machinery can be the known machineries of present technique field personnel, can be to have the chaffcutter machinery that rolls and cut off function simultaneously, can be the hammer Straw-crumbling machine, preferably uses the hammer Straw-crumbling machine.

Described dedusting is meant impurity such as the grain of removing in the forage, careless joint, dust, and cleaner and technology are conventionally known to one of skill in the art.

Do not float among the preparation method of straw pulp in the present invention, can at first adopt prior art that grass as raw material is got the raw materials ready, promptly adopt conventional dried, wet feed preparation, to remove impurity such as defoliation, fringe, grain, marrow, wheat, can alleviate the pressure of subsequent technique like this, and improve the quality of Straw Pulp.Dried, wet feed preparation can adopt existing conventional equipment, as chaffcutter, screening machine, dust removal machine, wet scrubbing Straw-crumbling machine, inclined screw Water Extraction Machinery etc.Dogstail raw material through the removal moisture after getting the raw materials ready also can be fine fodder, and the moisture of deduction dogstail raw material is the over dry grass, and the length of general blade is at 15-30mm, and the technology of getting the raw materials ready of raw material is technology as well known to those skilled in the art.

In the melting process in the present invention, also can utilize hammer mill to carry out dry raw material preparation, may further comprise the steps:

(1) grass prepared using hammer mill is cut off rubbing and handle, obtain cutting off the raw material after the rubbing;

The grass raw material is to hammer mill in this step, and described hammer mill comprises to be carried feeding section, fragmentation and rubbing section and break up the discharge section.The effect of being squeezed of grass raw material, cross section makes impurity such as leaf, awns, wheat, grain, marrow separate with stalk for circular grass raw material is crushed, and the grass raw material is discharged from the outlet of hammer mill.The length of the grass raw material of being discharged is 20-50mm.

Hammer mill among the present invention is the beater grinder of the existing usefulness of getting the raw materials ready.The rotating speed of described hammer mill is 500-800rpm, the speed that the grass raw material enters hammer mill is 0.5-1.3m/s, rotating speed is crossed words low or that charging is too fast, can cause some grass raw materials not crumpled fully, the infiltration of cooking liquor after the influence, and then influence pulp quality.

Grass raw material skin has one deck wax, and there is one deck marrow its bar inside, and in the general method of getting the raw materials ready, when skin was flooded by cooking liquor, wax can be removed soon, but because the internal layer of its bar has air, so cooking liquor is difficult to enter.After grass prepared using hammer mill cut off and crumple, help the abundant dipping of dogstail raw material, obtain the measured straw pulp of matter after the boiling easily.

(2) raw material that will cut off after the fragmentation carries out dust removal process;

Carry out dust removal process through the raw material after the cut-out fragmentation, this is owing to contain impurity such as dust, sandstone, blade of grass, careless fringe in the blade after cutting off, through dust removal process, above-mentioned impurity major part is removed, therefore in the digestion process after getting the raw materials ready, chemicals consumption in the time of can reducing boiling, the time of boiling also can shorten accordingly.

Carrying out dust removal machine that dust removal process adopted among the present invention can comprise roll-type dust removal machine, double cone dust removal machine and cyclone dust removal machine for the used dust removal machine of getting the raw materials ready of grass raw material in the prior art, and preferred described dust removal machine is the cyclone dust removal machine.Air quantity is 30000-38000m when carrying out dust removal process in cyclone dust collectors ³/ h, blast 210mm water column.Under such condition, can remove dust contained in the dogstail raw material in a large number, thereby alleviate the burden of follow-up boiling.

(3) will carry out Screening Treatment through the raw material of dust removal process.

The grass raw material often has foreign material such as thick blade and broken end through after the dust removal process, and in digestion process, these foreign material have is difficult for being permeated by cooking liquor, thus generation steaming separate thing; Though react with cooking liquor at the broken end that has, but black liquor viscosity is increased, influence the circulation of cooking liquor, cause half steaming, cause operating difficulties, influence the amount of black liquor extraction and the wash degree of slurry, so this step of Screening Treatment is a crucial step in the grass raw material dry raw material preparation.

After the dry raw material preparation method of the present invention, the edulcoration rate of dogstail raw material reaches more than 90%, and general method to carry out the edulcoration rate of dry raw material preparation be 70%, so not only can reduce the dust in the slurry, make that prepared slurry is clean, the yield height, yield improves 4-6% than general method, reduces 3-6% with method production cost of the present invention.

Described pre-preg is to add 100-120 ℃ presoak in the raw material after the dedusting, and control presoak and the mixed temperature of raw material are at 80-100 ℃, and the pre-preg time is 30-60 minute, and the preferred time is 40-60 minute.Described presoak can be the cooking liquor or the black liquor of slurrying, and the mass ratio of presoak and forage is 2-4: 1, be preferably 3-4: 1; The alkali content of presoak is 5-8%.

Raw material is carried out impregnation process, can remove the lignin of the heteroproteose cell in the raw material, tiny component, hemicellulose and a part on the one hand fast, improve the fiber fineness of raw material; The temperature of black liquor and residual alkali have obtained cycling and reutilization on the other hand, have reduced the consumption of the energy and resource.

Described extruding is to extrude presoak from the later slurry of pre-preg, and extrusion machinery can be Var-nip press or Double screw pulp extruder or reducing single-screw press master; Preferred single-screw press master, the raw material moisture after the extruding is between 75-85%.

Described screening is that the slurry after the extruding is screened, and isolates coarse impurities such as grass joint, and it is 80-98% that careless knotter screen removes rate, and screening technology and machinery are that ability is in technical staff's technique known.

Described boiling is meant that the boiling vessel of packing into of the fine fodder after the pulp screen choosing carries out boiling, and described boiling comprises a kind of in ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method:

During described ammonium sulfite boiling, the consumption of ammonium sulfite is the 6-8% to the over dry material quantity;

During described anthraquinone-soda cooking, alkali charge in NaOH to over dry material quantity 5-8%;

During described kraft cooking, alkali charge is that the NaOH meter is to over dry material quantity 4-8%;

During described alkaline sodium sulfite method boiling, sodium hydroxide concentration is counted 4-10% with the over dry raw material weight, and the sodium sulfite consumption is the 2-6% of over dry raw material weight.

Described boiling, boiling vessel comprise continuous steamer, batch (-type) spherical boiler, the upright pot of boiling.

Described boiling, stewing temperature are at 80-120 ℃, and digestion time was at 30-120 minute;

Described shove, shove machinery can be to well known to a person skilled in the art machinery, can also be reducing single-screw press masters, preferred reducing single-screw press master.

Described shove, the concentration of shove disposed slurry are 15-25%.

Described comb is separated, and the concentration of slurry was 15-25% when comb was separated

Test shows that adopting the high dense comb mode of separating mainly is to utilize extruding force between the fiber that raw material is combed to separate, and mill is very little to the cutting action of fiber, and is therefore very little to the influence of fibre length, changes fibre length hardly.

Described alkali treatment is to add aqueous slkali in the slurry behind the shove, and the concentration of aqueous slkali is 2-4%, and the reaction time is 30-60 minute;

Described shove ', be the slurry after the concentrated alkali treatment, the concentration after concentrating is 10-15%, concentrated technology and technology are conventionally known to one of skill in the art.

The preparation method of students in middle and primary schools' textbook paper for elementary and secondary of the present invention, wherein, the described making beating of step (2) is not floated straw pulp and can be taked low consistency pulping or middle and high consistency pulping, and preferred beating consistency is 8-23%, and preferred beating consistency is 13-23%.

Preparation method of the present invention, wherein, the described mixing of step (3) adds attached material in the slurry that mixes, described attached material can be talcum powder, modified alta-mud, starch, PAM, deciding agent, aluminum sulfate or white carbon black, urea-formaldehyde resin, starch, PAM, decide agent, aluminum sulfate;

Preparation method of the present invention, wherein, described the manufacturing paper with pulp of step (4) carried out on two net forming paper machines;

Compared with prior art, the present invention has following progressive part:

1, improved the fibre length of finished product slurry.

In the preparation method of the boiling of prior art, the time of boiling and insulation is long, the stewing temperature height, and the cooking liquor consumption is big, and temperature retention time is long, and this process conditions are very big to the damage of fiber.And in the method for the invention, the consumption of cooking liquor is few, and the time of boiling and insulation shortens greatly, under the condition that reduces the infringement of cellulose and hemicellulose as much as possible, carry out boiling, both reduce production cost thereby reach, energy savings can improve the purpose of the yield of slurrying again.With the Straw Pulp is example, and the average length of wheat straw fiber is 1.3mm, and by the bleached wheat straw pulp that prior art is produced, its average length is 0.5mm, and wherein tiny constituent content is about 12%; By the Straw Pulp of not floating of explained hereafter of the present invention, its average fiber length more than 0.8mm, wherein greater than the fiber content of 0.9mm greater than 50%, tiny constituent content is lower than 3%.

2, the preparation process of not floating straw pulp has been saved bleaching process, not only can save 13% cost, and significantly reduces the pollution to environment, avoids the generation of harmful substance, avoids the harm of bleaching agent to human body.

3, students in middle and primary schools' textbook paper for elementary and secondary of the present invention is a main raw material not float straw pulp, do not float straw pulp and can reduce the influence of bleaching process fracture length, tearability and folding number, and because preparation method's difference, make prepared straw pulp performance very excellent, can improve the quality of students in middle and primary schools' textbook paper for elementary and secondary greatly.Though wood pulp adds a large amount of minimizings and even do not add wood pulp, every main performance index can both be up to state standards, and has realized that straw pulp replaces the purpose of hardwood pulp.Students in middle and primary schools' textbook paper for elementary and secondary opacity height of the present invention, absorbency is good, intensity is high, durable in use, more can adapt to present high-speed press.

4, the anti-aging index of students in middle and primary schools' textbook paper for elementary and secondary of the present invention is significantly improved, and more is applicable to long seminal book and files of holding time such as all kinds of masterpieces of printing.

The specific embodiment

Below in conjunction with embodiment the present invention is described in more detail.It is pointed out that embodiment given below is illustrative, protection scope of the present invention is not constituted qualification.Those of ordinary skills can carry out various improvement and change under spirit of the present invention, and these changes and the change all fall within protection scope of the present invention.Protection scope of the present invention is as the criterion by appending claims.

Embodiment 1

Adopt hammer mill to pack into after getting the raw materials ready in the rotary spherical digester wheat straw raw material, in rotary spherical digester, add cooking liquor, the ammonium sulfite addition is 9% of an over dry material quantity, liquor ratio 1: 2, heat temperature raising to 110 ℃ for the first time, insulation is 30 minutes under this temperature, littler steam bleeding 25 minutes, post bake heat up 60 minutes to temperature be 168 ℃, be incubated 90 minutes.The hardness of resulting high-hardness pulp is 13 after the boiling, and beating degree is 24.6 ° of SR, and being diluted to concentration with rare black liquor is 2.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and loss is 0.5% in the screening.Adopt vacuum pulp washing machine washing in the prior art again.Obtaining concentration after the washing is 10% high-hardness pulp, underflow pipe in being transported to.Be transported to the oxygen delignification reaction tower through middle underflow pump.This slurry mixed with the oxygen of the 20kg slurry per ton that adds with to the aqueous slkali of oven dry stock amount in NaOH 4% in pipeline before entering reaction tower, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.3MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The described fracture length that does not float straw pulp is 3.0km, and folding strength is 20 times, and tearability is 170mN, and whiteness is 40%ISO, and beating degree is 33 ° of SR.

The above-mentioned straw pulp that do not float is pulled an oar, the above-mentioned straw pulp that do not float is pulled an oar, 34 ° of SR of beating degree, the making beating weight in wet base is 1.6g, gating leaf wood pulp in addition, 45 ° of SR of beating degree, the making beating weight in wet base is 7g.

Manufacture paper with pulp after slurry after the above-mentioned softwood pulp making beating of not floating straw pulp and 80% of weight portion 20% mixed, obtain described students in middle and primary schools' textbook paper for elementary and secondary.Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.0km, opacity 80%, and folding number is 25 times, whiteness is 75%ISO.

Embodiment 2

Adopt hammer mill to pack into after getting the raw materials ready in the rotary spherical digester straw raw material, in rotary spherical digester, add cooking liquor, the ammonium sulfite addition is 11% of an over dry material quantity, liquor ratio 1: 3, heat temperature raising to 113 ℃ for the first time, insulation is 30 minutes under this temperature, littler steam bleeding 27 minutes, post bake heat up 65 minutes to temperature be 170 ℃, be incubated 85 minutes.The hardness of resulting high-hardness pulp is 14 to be equivalent to card uncle valency 35.5 after the boiling, and beating degree is 23.7 ° of SR, and being diluted to concentration with rare black liquor is 2.5%, sieves screening method and screens as jumping through the screening technique of prior art again, and losing in the screening is 0.5%.Adopt vacuum pulp washing machine washing in the prior art again.Obtaining concentration after the washing is 11% high-hardness pulp, underflow pipe in being transported to.Be transported to the oxygen delignification reaction tower through middle underflow pump.This slurry mixed with the oxygen of the 22kg slurry per ton that adds with to the aqueous slkali of oven dry stock amount in NaOH 3% in pipeline before entering reaction tower, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 98 ℃ of inlet temperatures; pressure 0.95Mpa; stop and made this slurry can carry out sufficient delignification reaction in 80 minutes, tower top temperature is 100 ℃, and pressure remains 0.2MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The described fracture length that does not float straw pulp is 3.3km, and folding strength is 25 times, and tearability is 180mN, and whiteness is 38%ISO, and beating degree is 30 ° of SR.The above-mentioned straw pulp that do not float is pulled an oar, 33 ° of SR of beating degree, the making beating weight in wet base is 1.7g, other joins hardwood pulp, 20 ° of SR of beating degree, the making beating weight in wet base is 2.0g.

Manufacture paper with pulp after slurry after the above-mentioned softwood pulp making beating of not floating straw pulp and 75% of weight portion 25% mixed, obtain described students in middle and primary schools' textbook paper for elementary and secondary.Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.85km, opacity 82%, and folding number is 27 times, whiteness is 70%ISO.

Embodiment 3

Utilize hammer mill to carry out after the dry raw material preparation wheat straw raw material of 50% straw and 50%, pack in the batch (-type) spherical boiler, in the batch (-type) spherical boiler, add cooking liquor, the ammonium sulfite addition is 12% of an over dry material quantity, liquor ratio 1: 4, for the first time heat temperature raising to 120 ℃, insulation is 35 minutes under this temperature, again little steam bleeding 25 minutes, post bake heat up 60 minutes to temperature be 172 ℃, be incubated 83 minutes.The hardness of resulting high-hardness pulp is 15 after the boiling, and beating degree is 22.3 ° of SR, and being diluted to concentration with rare black liquor is 2.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and loss is 0.2% in the screening.Adopt vacuum pulp washing machine washing in the prior art again.Obtaining concentration after the washing is 10% high-hardness pulp, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 2.5%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 96 ℃ of inlet temperatures; pressure 0.93Mpa; stop and made this slurry can carry out sufficient delignification reaction in 85 minutes, tower top temperature is 105 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.0km, and folding strength is 40 times, and tearability is 200mN, and whiteness is 37%ISO, and beating degree is 31 ° of SR.

The weight portion 30% above-mentioned hardwood pulp that does not float straw pulp and 70% is pulled an oar respectively, straw pulp beating consistency 3.0%, wood pulp beating consistency 4.5%, making beating is carried out in two disc pulping machine kinds, resulting pulp quality standard is after the making beating: 32 ° of SR of straw pulp beating degree, the making beating weight in wet base is 1.8g, 25 ° of SR of wood pulp beating degree, and the making beating weight in wet base is 1.9g.

Slurry after the making beating is evenly manufactured paper with pulp after the mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.73km, opacity 83%, and folding number is 28 times, whiteness is 65%ISO.

Embodiment 4

Utilize hammer mill to carry out after the dry raw material preparation giantreed, in the continuous boiler of packing into, toward adding cooking liquor in the boiler continuously, alkali charge is to 15% of over dry material quantity in NaOH, the anthraquinone addition is 0.08%, liquor ratio 1: 3, digestion time 30 minutes.The hardness of resulting high-hardness pulp is 16 after the boiling, and beating degree is 20.8 ° of SR, and being diluted to concentration with rare black liquor is 2.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and loss is 0.2% in the screening.Adopt vacuum pulp washing machine washing in the prior art again.Obtaining concentration after the washing is 12% high-hardness pulp, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 28kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 2.5%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 98 ℃ of inlet temperatures; pressure 0.95Mpa; stop and made this slurry can carry out sufficient delignification reaction in 88 minutes, tower top temperature is 101 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.5km, and folding strength is 50 times, and tearability is 230mN, and whiteness is 39%ISO, and beating degree is 32 ° of SR.

The weight portion 40% above-mentioned giantreed slurry that do not float is pulled an oar respectively with 60% softwood pulp, straw pulp beating consistency 3.0%, wood pulp beating consistency 4.5%, making beating is carried out in two disc pulping machine kinds, resulting pulp quality standard is after the making beating: 32 ° of SR of straw pulp beating degree, the making beating weight in wet base is 2.2g, 40 ° of SR of wood pulp beating degree, and the making beating weight in wet base is 8g.

Slurry after the making beating is evenly manufactured paper with pulp after the mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.4km, opacity 86%, and folding number is 33 times, whiteness is 62%ISO.

Embodiment 5

With giantreed and reed by mass ratio be utilize hammer mill get the raw materials ready at 1: 4 after, the hot black liquor that by temperature is 135 ℃ is packed in the digester by packer, liquor ratio 1: 7, after filling, close pot cover, adding temperature in the digester is 145 ℃ of steaming preparations, alkali charge is to 13% of over dry material quantity in NaOH, the anthraquinone addition is 0.5% of an over dry material quantity, to adorn pot black liquor and air and discharge and boost to 0.6MPa, cooking liquor circulating pump and the tube still heater of opening digester are that cooking liquor is heated to 155 ℃, heat up and are incubated 160 minutes.With rare black liquor hot black liquor is displaced, deliver to the hot black liquor jar, the hardness that obtains after the boiling is 20 to be equivalent to the high-hardness pulp of card uncle valency 30,15 ° of SR of beating degree, regulate the concentration to 18% of high-hardness pulp, after be transported in the disc mill and discongest, wash through conventional washing methods again, heat this slurry to 70 ° ℃ and be transported to middle underflow pipe by conveying worm afterwards.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 35kg slurry per ton that adds and alkalinity for mixing in 2.5% the aqueous slkali of NaOH to the oven dry stock amount, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 100 ℃ of inlet temperatures; pressure 1.2Mpa; stop and made this slurry can carry out sufficient delignification reaction in 80 minutes, tower top temperature is 105 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 7.0km, and folding strength is 60 times, and tearability is 240mN, and whiteness is 35%ISO, and beating degree is 34 ° of SR.

The weight portion 70% above-mentioned wood pulp that does not float straw pulp and 30% is prepared, and two kinds of slurries are pulled an oar respectively, do not float 36 ° of SR of straw pulp beating degree, and weight in wet base is 1.6g, 32 ° of SR of wood pulp beating degree, and weight in wet base is 6g.

Slurry after the making beating is manufactured paper with pulp after mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.5km, opacity 90%, and folding number is 30 times, whiteness is 55%ISO.

Embodiment 6

Reed after utilizing hammer mill to get the raw materials ready is packed in the rotary spherical digester, in rotary spherical digester, add cooking liquor, alkali charge is to 9% of over dry material quantity in NaOH, the anthraquinone addition is 0.8%, liquor ratio 1: 4, for the first time heat temperature raising to 110 ℃, insulation is 40 minutes under this temperature, again little steam bleeding 30 minutes, post bake heat up 50 minutes to temperature be 173 ℃, be incubated 60 minutes.Obtain hardness after the boiling and be 20 and be equivalent to card uncle valency 30.7, the high-hardness pulp of 12.5 ° of SR of beating degree, then high-hardness pulp is sent into the reducing single-screw press master that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 20% high-hardness pulp, wash with conventional washing methods such as pressure washer again, after be transported in the mill fluffer and discongest, heat this slurry to 70 ℃ by conveying worm then and be transported in the underflow pipe.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for oven dry stock weight 4% aqueous slkali is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 70 minutes, tower top temperature is 100 ℃, and pressure remains 0.3MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 5.8km, and folding strength is 55 times, and tearability is 260mN, and whiteness is 45%ISO, and beating degree is 33 ° of SR.

The weight portion 75% above-mentioned wood pulp that does not float straw pulp and 25% is pulled an oar respectively, straw pulp beating consistency 3.5%, wood pulp beating consistency 4.5%, making beating is carried out in double disc refiner, 34 ° of SR of resultant reed pulp beating degree after the making beating, the making beating weight in wet base is 2.0g, 25 ° of SR of wood pulp beating degree, and the making beating weight in wet base is 10g.

Slurry after the making beating is evenly manufactured paper with pulp after the mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described manufacturing paper with pulp carried out in fourdrinier wire multi-cylinder paper machine paper machine.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 3.9km, opacity 92%, and folding number is 23 times, whiteness is 56%ISO.

Embodiment 7

Cotton stalk after will getting the raw materials ready through hammer mill is packed in the rotary spherical digester, in rotary spherical digester, add cooking liquor, alkali charge is to 8% of over dry material quantity in NaOH, sulphidity is 8%, liquor ratio 1: 2, for the first time heat temperature raising to 110 ℃, insulation is 40 minutes under this temperature, again little steam bleeding 25 minutes, post bake heat up 45 minutes to temperature be 166 ℃, be incubated 75 minutes.Obtain hardness after the boiling and be 22 and be equivalent to card uncle valency 35, beating degree is the high-hardness pulp of 11.6 ° of SR, be transported in the deflaker and discongest, then high-hardness pulp is sent into the Var-nip press that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 32% high-hardness pulp, regulate concentration to 2.5% with rare black liquor again, after slagging-off, wash through conventional washing methods again, the slurry that goes out pulp washing is dense to be adjusted to 15%., heat this slurry to 70 ℃ by conveying worm then and be transported in the underflow pipe.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 3%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 90 minutes, tower top temperature is 100 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.3km, and folding strength is 70 times, and tearability is 275mN, and whiteness is 42%ISO, and beating degree is 34 ° of SR.

Do not float straw pulp and wood pulp is pulled an oar respectively with above-mentioned, do not float 35 ° of SR of straw pulp beating degree, weight in wet base 2.0g, 29 ° of SR of wood pulp beating degree, weight in wet base 11g.

Manufacture paper with pulp after slurry after the above-mentioned wood pulp making beating of not floating straw pulp and 25% of weight portion 75% mixed, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.1km, opacity 94%, and folding number is 29 times, whiteness is 53%ISO.

Embodiment 8

With mass ratio is that 1: 3 straw and wheat straw utilize hammer mill to carry out packing into behind the dry raw material preparation in the rotary spherical digester, in rotary spherical digester, add cooking liquor, alkali charge is to 11% of over dry material quantity in NaOH, sulphidity is 5%, liquor ratio 1: 4, for the first time heat temperature raising to 110 ℃, insulation is 20 minutes under this temperature, again little steam bleeding 30 minutes, post bake heat up 40 minutes to temperature be 168 ℃, be incubated 90 minutes.The hardness that obtains after the boiling is 19 to be equivalent to the high-hardness pulp of card uncle valency 29, beating degree is 14.3 ° of SR, deliver to the reducing single-screw press master that conventional extraction black liquor uses again and carry out shove, the slurry that comes out from press master is diluted to the concentration to 3.0% of slurry with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, slurry concentration during washing is 3.0%, the slurry concentration of coming out from wash engine is 9%, keeps 70 ℃ in the washing process, is transported in the deflaker and discongests, slurry makes it fluidization by the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment again, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 4%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.3MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain the described straw pulp that do not float.The described fracture length that does not float straw pulp is 7.2km, and folding strength is 45 times, and tearability is 250mN, and whiteness is 42%ISO, and beating degree is 33 ° of SR.

The above-mentioned straw pulp that do not float is pulled an oar 35 ° of SR of beating degree, weight in wet base 2.0g, 35 ° of SR of wood pulp beating degree, weight in wet base 9g.

Slurry after 78% the wood pulp making beating of not floating straw pulp and 22% is evenly manufactured paper with pulp after the mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.Described manufacturing paper with pulp comprises resulting pulping after the above-mentioned making beating manufactured paper with pulp, described manufacturing paper with pulp carried out in short fourdrinier wire multi-cylinder paper machine, is 68.5g/m2 quantitatively, copies wide 1880mm, speed of a motor vehicle 260m/min is through obtaining students in middle and primary schools' textbook paper for elementary and secondary of the present invention after manufacturing paper with pulp.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.5km, opacity 96%, and folding number is 35 times, whiteness is 48%ISO.

Embodiment 9

Utilize hammer mill to carry out packing into behind the dry raw material preparation in the rotary spherical digester straw, in rotary spherical digester, add cooking liquor, alkali charge in NaOH to 15% of over dry material quantity, liquor ratio 1: 3, anthraquinone addition are 0.6% of over dry material quantity, for the first time heat temperature raising to 120 ℃, insulation is 20 minutes under this temperature, again little steam bleeding 20-30 minute, post bake heat up 40 minutes to temperature be 168 ℃, be incubated 90 minutes.Obtain hardness after the boiling and be 18 high-hardness pulps that are equivalent to card uncle valency 27, beating degree is 17 ° of SR, deliver to the reducing single-screw press master that conventional extraction black liquor uses again and carry out shove, the slurry that comes out from press master is diluted to the concentration to 2.5% of slurry with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, slurry concentration during washing is 3.0%, the slurry concentration of coming out from wash engine is 9%, keep 68-70 ℃ in the washing process, be transported in the deflaker again and discongest, transfers dense back to heat this slurry to 70 ℃ and be transported to middle underflow pipe by conveying worm.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity in 4% the aqueous slkali of NaOH to the oven dry stock amount, and in pipeline, feed steam and should starch heat temperature raising.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 102 ℃ of inlet temperatures; pressure 1.12Mpa; stop and made this slurry can carry out sufficient delignification reaction in 70 minutes, tower top temperature is 104 ℃, and pressure remains 0.5MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 4.4km, and folding strength is 65 times, and tearability is 245mN, and whiteness is 37%ISO, and beating degree is 29 ° of SR.

The weight portion 85% above-mentioned wood pulp that does not float straw pulp and 15% is pulled an oar respectively, straw pulp beating consistency 3.2%, wood pulp beating consistency 4.5%, making beating is carried out in double disc refiner, resulting pulp quality standard is after the making beating: 31 ° of SR of straw pulp beating degree, the making beating weight in wet base is 2.1g, 22 ° of SR of wood pulp beating degree, and the making beating weight in wet base is 1.5g.Described wood pulp is the hardwood pulp of prior art.

Slurry after the making beating is manufactured paper with pulp after evenly mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.0km, opacity 97%, and folding number is 31 times, whiteness is 40%ISO.

Embodiment 10

In the rotary spherical digester of packing into after the conventional dry raw material preparation of giantreed, in rotary spherical digester, add cooking liquor, alkali charge is to 11% of oven dry stock amount in NaOH, the anthraquinone addition is 0.8%, liquor ratio 1: 4, for the first time heat temperature raising to 130 ℃, insulation is 40 minutes under this temperature, again little steam bleeding 30 minutes, post bake heat up 60 minutes to temperature be 173 ℃, be incubated 60 minutes.Obtain hardness after the boiling and be 17 high-hardness pulp, beating degree is 16.3 ° of SR, then high-hardness pulp is sent into the reducing single-screw press master that the extraction black liquor is used in the prior art and carried out shove, obtain concentration after the shove and be 20% high-hardness pulp, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, and the slurry concentration during washing is 2.0%, and the slurry concentration of coming out from wash engine is 9%, keep 68-70 ℃ in the washing process, transfers dense back to heat this slurry to 70 ℃ and be transported to middle underflow pipe by conveying worm.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkali charge for oven dry stock amount 4% aqueous slkali is mixed in NaOH, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 102 ℃ of inlet temperatures; pressure 1.12Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 104 ℃, and pressure remains 0.5MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 5.0km, and folding strength is 69 times, and tearability is 255mN, and whiteness is 36%ISO, and beating degree is 27 ° of SR.

The weight portion 90% above-mentioned wood pulp that does not float straw pulp and 10% is pulled an oar respectively, straw pulp beating consistency 3.2%, wood pulp beating consistency 4.5%, making beating is carried out in double disc refiner, resulting pulp quality standard is after the making beating: 29 ° of SR of straw pulp beating degree, the making beating weight in wet base is 2.2g, 38 ° of SR of wood pulp beating degree, and the making beating weight in wet base is 1.6g.Described wood pulp is the hardwood pulp that prior art is produced.

Slurry after the making beating is manufactured paper with pulp after evenly mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.9km, opacity 98%, and folding number is 30 times, whiteness is 35%ISO.

Embodiment 11

It with mass ratio 1: 3: 1 straw, wheat straw and reed utilize hammer mill to carry out packing into behind the dry raw material preparation in the digester, the hot black liquor that by temperature is 135 ℃ is packed in the digester by packer, liquor ratio 1: 8, after filling, close pot cover, adding temperature in the digester is 145 ℃ of steaming preparations, alkali charge is to 11% of over dry material quantity in NaOH, the anthraquinone addition is 0.8% of an over dry material quantity, to adorn pot black liquor and air and discharge and boost to 0.6MPa, cooking liquor circulating pump and the tube still heater of opening digester are that cooking liquor is heated to 160 ℃, heat up and are incubated 180 minutes.With rare black liquor hot black liquor is displaced, deliver to the hot black liquor jar, the hardness that obtains after the boiling is 21 high-hardness pulp, 12 ° of SR of beating degree, deliver to the reducing single-screw press master that conventional extraction black liquor uses again and carry out shove, the slurry that comes out from press master is diluted to the concentration to 3.0% of slurry with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, slurry concentration during washing is 3.0%, the slurry concentration of coming out from wash engine is 9%, keeps 70 ℃ in the washing process, is transported in the deflaker and discongests, slurry makes it fluidization by the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment again, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 4%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 95 ℃ of inlet temperatures; pressure 0.9Mpa; stop and made this slurry can carry out sufficient delignification reaction in 75 minutes, tower top temperature is 100 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 6.5km, and folding strength is 45 times, and tearability is 250mN, and whiteness is 38%ISO, and beating degree is 23 ° of SR.

The weight portion 95% above-mentioned wood pulp that does not float straw pulp and 5% is prepared, two kinds of slurries are pulled an oar respectively, and making beating is pulled an oar in two disc pulping machine kinds, and its beating consistency is 3.4%, resulting pulp quality standard is after the making beating: 28 ° of SR of beating degree, the making beating weight in wet base is 2.2g.20 ° of SR of softwood pulp beating degree, the making beating weight in wet base is 13g, described wood pulp is the softwood pulp that prior art is produced.

Slurry after the making beating is added talcum powder 0.5%, modified alta-mud 0.13%, starch 0.40%, PAM0.27% respectively, deciding agent 0.020%, aluminum sulfate 0.63%, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.7km, opacity 93%, and folding number is 32 times, whiteness is 36%ISO.

Embodiment 12

With mass ratio is 1: 1: 1: 1: 1 straw, wheat straw, reed, cotton stalk utilize hammer mill to carry out after the dry raw material preparation, pack in the continuous steamer, in continuous steamer, add cooking liquor, the alkali addition is 11% of an over dry material quantity, the sodium sulfite addition is 2% of an over dry material quantity, liquor ratio 1: 9, heat are warming up to 160 ℃, are incubated 30 minutes.The hardness of resulting high-hardness pulp is 23 after the boiling, and beating degree is 11.4 ° of SR, and being diluted to concentration with rare black liquor is 2.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and loss is 0.2% in the screening.Adopt vacuum pulp washing machine washing in the prior art again.Obtaining concentration after the washing is 10% high-hardness pulp, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 26kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3.5%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 97 ℃ of inlet temperatures; pressure 1.1Mpa; stop and made this slurry can carry out sufficient delignification reaction in 65 minutes, tower top temperature is 100 ℃, and pressure remains 0.45MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 7.5km, and folding strength is 90 times, and tearability is 280mN, and whiteness is 33%ISO, and beating degree is 21.5 ° of SR.

The weight portion 99% above-mentioned wood pulp that does not float straw pulp and 1% is pulled an oar respectively, straw pulp beating consistency 15%, wood pulp beating consistency 4.5%, making beating is carried out in two disc pulping machine kinds, resulting pulp quality standard is after the making beating: 28 ° of SR of straw pulp beating degree, the making beating weight in wet base is 1.9g, 35 ° of SR of wood pulp beating degree, and the making beating weight in wet base is 1.8g.Described wood pulp be prior art produce hardwood pulp.

Slurry after the making beating is added talcum powder 0.6%, modified alta-mud 0.11%, starch 0.41%, PAM0.28% respectively, deciding agent 0.021%, aluminum sulfate 0.65%.Manufacture paper with pulp after evenly mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.0km, opacity 80%, and folding number is 15 times, whiteness is 58%ISO.

Embodiment 13

It with mass ratio 2: 1: 1 giantreed, reed and cotton stalk utilize hammer mill to carry out packing into behind the dry raw material preparation in the digester, the hot black liquor that by temperature is 135 ℃ is packed in the digester by packer, liquor ratio 1: 8, after filling, close pot cover, adding temperature in the digester is 145 ℃ of steaming preparations, alkali charge is to 11% of over dry material quantity in NaOH, the sodium sulfite addition is 6% of an over dry material quantity, the anthraquinone addition is 0.08% of an over dry material quantity, to adorn pot black liquor and air and discharge and boost to 0.6MPa, cooking liquor circulating pump and the tube still heater of opening digester are that cooking liquor is heated to 152 ℃, heat up and are incubated 220 minutes.With rare black liquor hot black liquor is displaced, deliver to the hot black liquor jar, the hardness that obtains after the boiling is 19 high-hardness pulp, 13 ° of SR of beating degree, deliver to the reducing single-screw press master that conventional extraction black liquor uses again and carry out shove, the slurry that comes out from press master is diluted to the concentration to 3.0% of slurry with rare black liquor, deliver to jump to sieve and carry out thick pulp screen choosing, jumping the sieve loss is 0.2%, remove impurity by the high concentration scummer again, loss 0.1%, the slurry that will obtain after will removing the gred again enters the horizontal belt wash engine and washs, slurry concentration during washing is 3.0%, the slurry concentration of coming out from wash engine is 9%, keeps 70 ℃ in the washing process, is transported in the deflaker and discongests, slurry makes it fluidization by the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment again, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock weight 4%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock weight; 90 ℃ of inlet temperatures; pressure 1.15Mpa; stop and made this slurry can carry out sufficient delignification reaction in 60 minutes, tower top temperature is 102 ℃, and pressure remains 0.6MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 6.5km, and folding strength is 85 times, and tearability is 265mN, and whiteness is 38%ISO, and beating degree is 23 ° of SR.

The weight portion 50% above-mentioned wood pulp that does not float straw pulp and 50% is prepared, two kinds of slurries are pulled an oar respectively, making beating is pulled an oar in two disc pulping machine kinds, its beating consistency is 3.4%, resulting pulp quality standard is after the making beating: do not float 31 ° of SR of straw pulp beating degree, the making beating weight in wet base is 1.8g.40 ° of SR of hardwood pulp beating degree, the making beating weight in wet base is 1.4g, described wood pulp is the hardwood pulp that prior art is produced.

Slurry after the making beating is manufactured paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 3.0km, opacity 87%, and folding number is 15 times, whiteness is 49%ISO.

Embodiment 14

Utilize hammer mill to carry out after the dry raw material preparation wheat straw, in the continuous boiler of packing into, toward adding cooking liquor in the boiler continuously, alkali charge in NaOH to 10% of over dry material quantity, the anthraquinone addition is 0.08%, liquor ratio 1: 4, digestion time 30 minutes, 169 ℃ of temperature.The hardness of resulting high-hardness pulp is 21 after the boiling, and beating degree is 17.8 ° of SR, and being diluted to concentration with rare black liquor is 2.5%, and the screening technique through prior art screens as jumping the sieve screening method again, and loss is 0.2% in the screening.Adopt vacuum pulp washing machine washing in the prior art again.Obtaining concentration after the washing is 12% high-hardness pulp, heats this slurry to 70 ℃ and is transported to middle underflow pipe by conveying worm then.This slurry makes it fluidization at the air that middle underflow Guan Zhongxian gets rid of in the slurry through modifier treatment, after centrifugal middle underflow pump is transported to the oxygen delignification reaction tower.This slurry before entering reaction tower in pipeline with the oxygen of the 20kg slurry per ton that adds and alkalinity for to mix in the aqueous slkali of NaOH to oven dry stock amount 3.0%, and feeding steam should be starched heat temperature raising in pipeline.This slurry enters the oxygen delignification reaction tower after fully mixed in blender afterwards; protective agent is a magnesium sulfate; addition is 1% of an oven dry stock amount; 98 ℃ of inlet temperatures; pressure 0.95Mpa; stop and made this slurry can carry out sufficient delignification reaction in 60 minutes, tower top temperature is 101 ℃, and pressure remains 0.4MPa.After finishing dealing with this slurry is spurted stock tank and dilution, obtain described brown stock.The fracture length of described brown stock is 7.5km, and folding strength is 90 times, and tearability is 280mN, and whiteness is 37%ISO, and beating degree is 25 ° of SR.

The above-mentioned straw pulp that do not float is divided into two A, a B part according to 80: 20 ratio, pull an oar respectively, the beating consistency of A slurry is 23%, the beating consistency 6.0% of B slurry, resulting pulp quality standard is after the making beating: 27 ° of SR of A slurry beating degree, and the making beating weight in wet base is 3.2g; 35 ° of SR of beating degree of B slurry, the making beating weight in wet base is 1.8g.

Slurry after the making beating is mixed, add talcum powder 0.6%, modified alta-mud 0.11%, starch 0.41%, PAM0.28% respectively, deciding agent 0.021%, aluminum sulfate 0.65%.Mix the back and on two net forming paper machines, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary quantitatively is 47.0g/m2, and the cross direction ration coefficient of variation 1.0%, opacity 93%, print surface roughness are 1.20 μ m, and fracture length is 5.5km, and whiteness is 38%ISO.

Embodiment 15

The Straw Pulp of not floating of not floating rice straw pulp and embodiment 14 gained of not floating giantreed slurry, embodiment 2 gained of embodiment 4 gained is pulled an oar respectively, not floating giantreed slurry beating consistency is 16%, not floating the Straw Pulp beating consistency is 8%, not floating the rice straw pulp beating consistency is 3%, pulping standard after the making beating is: the 35 ° of SR of beating degree that do not float the giantreed slurry, the making beating weight in wet base is that 2.8g does not float 36 ° of SR of Straw Pulp beating degree, the making beating weight in wet base be 2.0g get do not float 45 ° of SR of rice straw pulp beating degree, the making beating weight in wet base is 1.6g.

With not floating giantreed slurry, do not float Straw Pulp and not floating rice straw pulp after the making beating, add and add white carbon black 0.06%, urea-formaldehyde resin 0.09%, starch 0.41%, PAM0.28% respectively, deciding agent 0.021%, aluminum sulfate 0.65% according to 50: 30: 20 mixed.Mix the back and on two net forming paper machines, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.0km, opacity 80%, and folding number is 25 times, whiteness is 45%ISO.

Embodiment 16

Utilize hammer mill to carry out after the dry raw material preparation wheat straw, with 120 ℃ black liquor preimpregnation, the alkali content of black liquor is 8%, and the mass ratio of black liquor and forage is 4: 1; The pre-preg time is 30 minutes.Wheat straw after the preimpregnation is sent into the extruding of single-screw press master, the concentration of extruding back wheat straw is 20%, and the wheat straw after the extruding is sent into the reciprocating sieve screening, screens out the rotary spherical digester of packing into behind the impurity such as grass joint, add ammonium sulfite solution in rotary spherical digester, the consumption of ammonium sulfite is to 8% of over dry material quantity; Feed Steam Heating, temperature is controlled at 100-105 ℃, heat up, be incubated 60 minutes, the slurry after the boiling is carried out shove, the concentration of shove disposed slurry is 15%, slurry behind the shove is transported to breaker beater to be combed and separates, the concentration of comb when separating is 15%, and the slurry after comb is separated is transported to pipeline, and adding concentration is 4% aqueous slkali in the pipeline, keeping the concentration of slurry in the pipeline is 10%, and the reaction time is 30 minutes; Promptly obtain the described straw pulp that do not float behind the slurry washing.

To not float the straw pulp making beating, beating consistency is 13%, and the slurry after the making beating is sieved, and the sifter mesh is 110 orders, tiny constituent content≤5% in the slurry behind the sieve.

Add starch 0.40%, PAM0.24% in the slurry, deciding agent 0.023%, aluminum sulfate 0.62%.Mix the back and on two net forming paper machines, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.85km, opacity 82%, and folding number is 27 times, whiteness is 38%ISO.

Embodiment 17

With mass ratio is 1: 1 straw and wheat straw, utilizes hammer mill to carry out after the dry raw material preparation, and with 100 ℃ black liquor preimpregnation, the alkali content of black liquor is 6%, and the mass ratio of black liquor and forage is 3: 1; The pre-preg time is 40 minutes.Wheat straw after the preimpregnation is sent into the extruding of single-screw press master, the concentration of extruding back wheat straw is 25%, and the wheat straw after the extruding is sent into the reciprocating sieve screening, screens out the rotary spherical digester of packing into behind the impurity such as grass joint, add sodium hydroxide solution in rotary spherical digester, the consumption of NaOH is to 8% of over dry material quantity; The anthraquinone addition is 0.06% feeding Steam Heating, temperature is controlled at 95-100 ℃, heat up, be incubated 120 minutes, the slurry after the boiling is carried out shove, the concentration of shove disposed slurry is 20%, slurry behind the shove is transported to breaker beater to be combed and separates, the concentration of comb when separating is 20%, and the slurry after comb is separated is transported to pipeline, and adding concentration is 3% aqueous slkali in the pipeline, keeping the concentration of slurry in the pipeline is 13%, and the reaction time is 40 minutes; Promptly obtain the described straw pulp that do not float behind the slurry washing.

To not float the straw pulp making beating, beating consistency is 15%, and the slurry after the making beating is sieved, and the sifter mesh is 110 orders, tiny constituent content≤6% in the slurry behind the sieve.

Add starch 0.45%, PAM0.25% in the slurry, deciding agent 0.026%, aluminum sulfate 0.61%.Mix the back and on two net forming paper machines, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.73km, opacity 83%, and folding number is 28 times, whiteness is 40%ISO.

Embodiment 18

Utilize hammer mill to carry out after the dry raw material preparation giantreed, with 120 ℃ cooking liquor preimpregnation, the alkali content of cooking liquor is 8%, and the mass ratio of cooking liquor and forage is 4: 1; The pre-preg time is 60 minutes.Giantreed after the preimpregnation is sent into the extruding of single-screw press master, the concentration of extruding back giantreed slurry is 18%, and the giantreed slurry after the extruding is sent into the reciprocating sieve screening, screens out the rotary spherical digester of packing into after the coarse impurities, add sodium hydroxide solution in rotary spherical digester, the consumption of NaOH is to 8% of over dry material quantity; The anthraquinone addition is 0.06% feeding Steam Heating, temperature is controlled at 115-120 ℃, heat up, be incubated 120 minutes, the slurry after the boiling is carried out shove, the concentration of shove disposed slurry is 20%, slurry behind the shove is transported to breaker beater to be combed and separates, the concentration of comb when separating is 20%, and the slurry after comb is separated is transported to pipeline, and adding concentration is 4% aqueous slkali in the pipeline, keeping the concentration of slurry in the pipeline is 10%, and the reaction time is 40 minutes; Promptly obtain the described straw pulp that do not float behind the slurry washing.

To not float the straw pulp making beating, beating consistency is 10%, and the slurry after the making beating is sieved, and the sifter mesh is 110 orders, tiny constituent content≤4% in the slurry behind the sieve.

Add talcum powder 0.6%, modified alta-mud 0.11%, starch 0.41%, PAM0.28% in the slurry, deciding agent 0.021%, aluminum sulfate 0.65%.Mix the back and on two net forming paper machines, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.4km, opacity 86%, and folding number is 33 times, whiteness is 42%ISO.

Embodiment 19

According to mass ratio 1: 1: 1: 1 will be except that the cooking liquor preimpregnation with 120 ℃ of giantreed after the bagasse behind the marrow, the dry raw material preparation, straw, wheat straw, and the alkali content of cooking liquor is 6%, and the mass ratio of cooking liquor and forage is 2: 1; The pre-preg time is 60 minutes.Slurry after the preimpregnation is sent into the extruding of single-screw press master, the concentration of extruding back giantreed slurry is 25%, giantreed slurry after the extruding is sent into the reciprocating sieve screening, screen out the rotary spherical digester of packing into after the coarse impurities, in rotary spherical digester, add sodium hydroxide solution, sodium hydroxide concentration counts 10% with the over dry raw material weight, and the sodium sulfite consumption is 6% of an over dry raw material weight.The anthraquinone addition is 0.06%, feed Steam Heating, temperature is controlled at 90-110 ℃, heats up, is incubated 120 minutes, slurry after the boiling is carried out shove, the concentration of shove disposed slurry is 23%, the slurry behind the shove is transported to breaker beater combs and separate, and the concentration when comb is separated is 23%, slurry after comb separated is transported to pipeline, adding concentration in the pipeline is 4% aqueous slkali, and keeping the concentration of slurry in the pipeline is 14%, and the reaction time is 50 minutes; Promptly obtain the described straw pulp that do not float behind the slurry washing.

To not float the straw pulp making beating, beating consistency is 12%, and the slurry after the making beating is sieved, and the sifter mesh is 110 orders, tiny constituent content≤4% in the slurry behind the sieve.

Add talcum powder 0.6%, modified alta-mud 0.11%, starch 0.41%, PAM0.28% in the slurry, deciding agent 0.021%, aluminum sulfate 0.65%.Manufacture paper with pulp after mixing, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary quantitatively is 47.0g/m2, and the cross direction ration coefficient of variation 1.7%, opacity 95%, print surface roughness are 2.20 μ m, and fracture length is 5.7km, and whiteness is 42%ISO.

Embodiment 20

Wheat straw is with after the dry raw material preparation, and with 80 ℃ cooking liquor preimpregnation, the alkali content of cooking liquor is 8%, and the mass ratio of cooking liquor and forage is 4: 1; The pre-preg time is 60 minutes.Slurry after the preimpregnation is sent into the extruding of single-screw press master, the concentration of extruding back giantreed slurry is 25%, slurry after the extruding is sent into the reciprocating sieve screening, after screening out coarse impurities, use the continuous steamer boiling, sodium hydroxide concentration counts 8% with the over dry raw material weight, the anthraquinone addition is 0.06%, feed Steam Heating, temperature is controlled at 90-110 ℃, boiling 30 minutes, slurry after the boiling is carried out shove, the concentration of shove disposed slurry is 23%, the slurry behind the shove is transported to breaker beater combs and separate, and the concentration when comb is separated is 23%, slurry after comb separated is transported to pipeline, adding concentration in the pipeline is 4% aqueous slkali, and keeping the concentration of slurry in the pipeline is 14%, and the reaction time is 50 minutes; Promptly obtain the described straw pulp that do not float behind the slurry washing.

To not float the straw pulp making beating, beating consistency is 12%, and the slurry after the making beating is sieved, and the sifter mesh is 110 orders, tiny constituent content≤4% in the slurry behind the sieve.

Add talcum powder 0.6%, modified alta-mud 0.11%, starch 0.41%, PAM0.28% in the slurry, deciding agent 0.021%, aluminum sulfate 0.65%.Mix the back and on two net forming paper machines, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 5.5km, opacity 96%, and folding number is 35 times, whiteness is 42%ISO.

Embodiment 21

The straw pulp that do not float of embodiment 1 is sieved, and its tiny constituent content≤8% obtains the A slurry, to carry out beating consistency be 20% to the straw pulp that do not float of embodiment 17, the screening of making beating back, tiny constituent content≤4% in the slurry behind the sieve, obtain the B slurry, obtain the C slurry after the softwood pulp making beating.

A slurry, B slurry and C starch the mixed according to 20: 75: 5, add talcum powder 0.6%, modified alta-mud 0.11%, starch 0.41%, PAM0.28%, are deciding agent 0.021%, aluminum sulfate 0.65%.Mix the back and on two net forming paper machines, manufacture paper with pulp, obtain described students in middle and primary schools' textbook paper for elementary and secondary.

Described students in middle and primary schools' textbook paper for elementary and secondary fracture length is 4.9km, opacity 98%, and folding number is 30 times, whiteness is 35%ISO.

Claims (17)

1. students in middle and primary schools' textbook paper for elementary and secondary is characterized in that, the used slurry of described students in middle and primary schools' textbook paper for elementary and secondary comprises the wood pulp that does not float straw pulp and 0-80% of 20-100%.

2. students in middle and primary schools' textbook paper for elementary and secondary according to claim 1 is characterized in that, the fracture length of described students in middle and primary schools' textbook paper for elementary and secondary is 2.5-5.5km, and preferred described fracture length is 3.5-5.5km.

3. students in middle and primary schools' textbook paper for elementary and secondary according to claim 1, it is characterized in that, the opacity of described students in middle and primary schools' textbook paper for elementary and secondary is 80-98%, the opacity of preferred described students in middle and primary schools' textbook paper for elementary and secondary is 82-98%, and the opacity of more preferably described students in middle and primary schools' textbook paper for elementary and secondary is 85-98%.

4. students in middle and primary schools' textbook paper for elementary and secondary according to claim 1 is characterized in that, the folding strength of described students in middle and primary schools' textbook paper for elementary and secondary is 4-35 time, and the folding strength of preferred described students in middle and primary schools' textbook paper for elementary and secondary is 8-35 time.

5. according to any one described students in middle and primary schools' textbook paper for elementary and secondary among the claim 1-4, it is characterized in that the described fracture length that does not float straw pulp is 3.0-7.5km, tearability is 170-280mN, whiteness is 35-45%ISO, and folding number is 20-90 time, and beating degree is 26-34 ° of SR; The preferred described fracture length that does not float straw pulp is 4.0-6.5km, and tearability is 200-280mN, and folding number is 25-90 time, and beating degree is 28-32 ° of SR.

6. a method for preparing described students in middle and primary schools' textbook paper for elementary and secondary of claim 1 or 2 or 3 or 4 is characterized in that the preparation of students in middle and primary schools' textbook paper for elementary and secondary comprises the steps:

(1) straw pulp is not floated in preparation;

(2) wood pulp of selling on straw pulp, the market that do not float that step (1) is obtained is pulled an oar respectively, the slurry after obtaining pulling an oar;

(3) after the making beating that step (2) is obtained do not float straw pulp and the making beating after wood pulp, with 20-100% even, obtain mixed slurry with mixed 80-0%;

(4) slurry that mixes that step (3) is obtained is manufactured paper with pulp, and obtains described students in middle and primary schools' textbook paper for elementary and secondary.

7. method according to claim 6 is characterized in that, the described fibre length mean value 〉=0.6mm that does not float straw pulp of step (1), preferred fibre length mean value 〉=0.8mm.

8. method according to claim 6 is characterized in that, step (1) is described do not float its raw material of straw pulp comprise in wheat straw, straw, cotton stalk, giantreed or the reed one or more combination.

9. method according to claim 6 is characterized in that, straw pulp is not floated in the described preparation of step (1), and its boiling method comprises a kind of in ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method.

10. method according to claim 6 is characterized in that, straw pulp is not floated in the described preparation of step (1), and its boiling vessel comprises the upright pot of continuous steamer, batch (-type) spherical boiler or boiling.

11. method according to claim 6 is characterized in that, straw pulp is not floated in the described preparation of step (1), and its preparation method is the traditional pulping process or the method or the alkali treatment method of oxygen delignification.

12. method according to claim 11 is characterized in that, described traditional pulping process be meant adopt general boiling and comb is separated, the washing process preparation do not float straw pulp, pulping process and technology are known in those skilled in the art.

13. method according to claim 11 is characterized in that the method for described oxygen delignification comprises:

Chaffcutter-dedusting-boiling-shove-comb is separated-oxygen delignification;

Described chaffcutter is meant the grass section that raw material is cut into 1.5-2.5cm; Chaffcutter machinery is for the known machinery of present technique field personnel or have chaffcutter machinery or the hammer Straw-crumbling machine that rolls and cut off function simultaneously, preferably uses the hammer Straw-crumbling machine;

Described dedusting is meant impurity such as the grain of removing in the forage, careless joint, dust, and cleaner and technology are conventionally known to one of skill in the art;

Described boiling is meant that the fine fodder of slurry after the dedusting put into boiling vessel and carry out boiling, and described boiling comprises a kind of in ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method:

During described ammonium sulfite boiling, the consumption of ammonium sulfite is the 9-13% to the over dry material quantity;

During described anthraquinone-soda cooking, alkali charge in NaOH to over dry material quantity 9-15%;

During described kraft cooking, alkali charge is that the NaOH meter is to over dry material quantity 8-11%;

During described alkaline sodium sulfite method boiling, sodium hydroxide concentration is counted 11-15% with the over dry raw material weight, and the sodium sulfite consumption is the 2-6% of over dry raw material weight;

Described boiling, boiling vessel comprise the upright pot of continuous steamer, batch (-type) spherical boiler or boiling;

Described shove, shove machinery is for well known to a person skilled in the art machinery or reducing single-screw press master, preferred reducing single-screw press master;

Described shove, the concentration of shove disposed slurry are 15-25%;

Described comb is separated, and before and after comb was separated, the beating degree numerical value of slurry raise and is not more than 5 ° of SR;

Described comb is separated, and the breaker beater tool is high frequency beater or mill or the known making beating machinery of those skilled in the art of the present technique;

Described oxygen delignification comprises: with obtaining hardness after the boiling is permanganate number 13-28, and the high-hardness pulp of preferred 16-28 is pumped to the oxygen delignification reaction tower, and adds NaOH and oxygen; This high-hardness pulp carries out delignification reaction in this oxygen delignification reaction tower, obtain the slurry that hardness is permanganate number 10-14;

Preferred described oxygen delignification is the single hop oxygen delignification, carries out in the oxygen delignification reaction tower; Described high-hardness pulp is 95-100 ℃ in the temperature of this reaction tower import department, and pressure is 0.9-1.2MPa; The temperature in exit is 100-105 ℃, and pressure is 0.2-0.6MPa; Alkali charge is that the addition of oxygen is a 20-40kg slurry per ton in the 2-4% of NaOH to the oven dry stock amount in the described oxygen delignification; The reaction time of described high-hardness pulp in this reaction tower is 60-90 minute.

14. method according to claim 11 is characterized in that, described alkali treatment method comprises:

Chaffcutter-dedusting-pre-preg-extruding-screening-boiling-shove-comb is separated-alkali treatment-shove '-washing;

Described chaffcutter is raw material to be cut into described chaffcutter be meant the grass section that raw material is cut into 1.5-2.5cm; Chaffcutter machinery is for the known machinery of present technique field personnel or have chaffcutter machinery or the hammer Straw-crumbling machine that rolls and cut off function simultaneously, preferably uses the hammer Straw-crumbling machine;

Described dedusting is meant impurity such as the grain of removing in the forage, careless joint, dust, and cleaner and technology are conventionally known to one of skill in the art;

Described pre-preg is to add 80-120 ℃ presoak in the forage after the dedusting, and described presoak can be the cooking liquor or the black liquor of slurrying, and the mass ratio of the pre-forage of presoak is 2-4: 1, be preferably 3-4: 1; The alkali content of presoak is 5-8%; The pre-preg time is 30-60 minute, and the preferred time is 40-60 minute;

Described extruding is to extrude presoak from the later slurry of pre-preg, and extrusion machinery is Var-nip press or Double screw pulp extruder or reducing single-screw press master; Preferred single-screw press master;

Described screening is that the slurry after the extruding is screened, and isolates coarse impurities such as grass joint, and it is 80-95% that careless knotter screen removes rate, and the machinery of selecting for use is drum sieve, and screening technology and machinery are for well known to a person skilled in the art technology;

Described boiling is meant carries out boiling with the fine fodder boiling vessel of packing into after the screening, and described boiling comprises a kind of in ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method:

During described ammonium sulfite boiling, the consumption of ammonium sulfite is the 6-8% to the over dry material quantity;

During described anthraquinone-soda cooking, alkali charge in NaOH to over dry material quantity 5-8%;

During described kraft cooking, alkali charge is that the NaOH meter is to over dry material quantity 4-8%;

During described alkaline sodium sulfite method boiling, sodium hydroxide concentration is counted 4-10% with the over dry raw material weight, and the sodium sulfite consumption is the 2-6% of over dry raw material weight;

Described boiling, boiling vessel comprise the upright pot of continuous steamer, batch (-type) spherical boiler or boiling.

Described boiling, stewing temperature are at 80-120 ℃, and digestion time was at 30-120 minute;

Described shove, shove machinery is for well known to a person skilled in the art machinery or reducing single-screw press master, preferred reducing single-screw press master;

Described shove, the concentration of shove disposed slurry are 15-25%;

Described comb is separated, and the concentration of slurry was 15-25% when comb was separated;

Described alkali treatment is to add aqueous slkali in the slurry behind the shove, and the concentration of aqueous slkali is 2-4%, and the reaction time is 30-60 minute;

Described shove ' be the slurry after the concentrated alkali treatment, the concentration after concentrating is 10-15%.

15. method according to claim 6 is characterized in that, the described making beating of step (2) is not floated straw pulp and can be taked low consistency pulping or middle and high consistency pulping, and preferred beating consistency is 8-23%, and preferred beating consistency is 13-23%.

16. method according to claim 6 is characterized in that, the described making beating of step (2), after making beating finishes, the straw pulp that do not float after the making beating is sieved, and the rate that screens out 〉=50% of fiber fines or tiny component, the mesh of employed sifter are the 100-120 order.

17. method according to claim 6 is characterized in that, the described mixing of step (3) adds attached material in the slurry that mixes, and described attached material can be talcum powder, starch, PAM, deciding agent, aluminum sulfate.