CN101660285B - Unbleached straw pulp with improved color phase, folding endurance and loose depth, and stable performances - Google Patents
Unbleached straw pulp with improved color phase, folding endurance and loose depth, and stable performances Download PDFInfo
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Abstract
The invention relates to an unbleached straw pulp with improved color phase, folding endurance and loose depth, and stable performances, in particular to the unbleached straw pulp and applications thereof in mixed pulp and paper products. The unbleached straw pulp has the advantages that the color phase or white degree is obviously improved, the loose depth is higher, the folding endurance is higher, and the quality fluctuation of the pulp is small, so that data of the pulp of the obtained unbleached straw pulp is more stable.
Description
Technical field
What the present invention relates to is a kind of form and aspect, folding strength and the bulk of improvement and the natural-color straw pulp of stable performance, and concretely, what the present invention relates to is a kind of described natural-color straw pulp, and their application in mixed pulp, paper products.
Background technology
In the daily life, paper can be divided into cultural paper, industrial paper, paper for daily use and the special paper of using according to purposes, and wherein cultural paper can be divided into uncoated paper and coated paper simply.Paper without coating processing is referred to as uncoated paper, like newsprint, offset paper, electro-photographic paper and writing paper etc.; Paper through coating processing is referred to as coated paper, like art paper, wall calendar paper, inferior machine-glazed paper, glass paperboard etc.Their manufacturing comprises following several links:
Slurrying section: material choice → boiling defibre → washing → bleaching → washing and screening → concentrate or copy into lodicule → store for future use;
Copy the paper section: the stream of the mixing → paper stock of the slurry → removal of impurity of loosing → refining → various additive → paper stocks of pulling an oar → prepare send → case → wet end → press section → drying section → top sizing → drying → press polish → coil into paper;
Coating section: the volume → supercalendering of bodystock paper → coating machine coating → drying → batch → again;
Processing sections: rewinding → cutting flat board (or reel) → sorted and packaged → warehouse-in finishes;
What the present invention related generally to is pulping process and the paper pulp that makes, and existing pulping process comprises chemistry, machinery or both combinations, and the mode that is preferred for slurrying of the present invention is the combination of chemistry, machinery pulping mode.
In the prior art, paper pulp is divided into wood pulp and straw pulp usually, and described wood pulp is meant softwood pulp (like masson pine, larch, Korean pine, dragon spruce etc.) and hardwood pulp (like birch, poplar, linden, Eucalyptus, maple etc.).Described straw pulp is meant standing grain section fiber pulp (like straw, wheat straw, reed, bamboo, bagasse etc.), bast fiber slurry (like hemp, bluish dogbane, flax, mulberry skin, cotton stalk bark etc.) and seed hair fiber slurry (like cotton fiber etc.).
Prior art thinks that later paper pulp is separated, washs, screens and bleached to boiling or machinery mill, can't directly be used for copying paper.In order to satisfy the different serviceabilities of paper, also need in the preparation process of paper, in paper pulp or preparation process, add various auxiliary agents or auxiliary material; Described auxiliary agent or auxiliary material comprise filler, sizing material, colorant and other chemical assistants; In printing, add the printability that filler can improve paper, as increasing paper of whiteness, smoothness, opacity, deflection, simultaneously; Can improve affinity, pliability and the stability of paper, thereby help the raising of print quality printing ink.
But paper pulp is basic to the influence of paper, in the prior art; The general each item physical index that adopts bleached pulp or mixed pulp is estimated the various performances of paper, and stable through a period of time is fixed up the relation of paper pulp and paper; This production for paper pulp is useful; Specific to straw pulp, the influence that the physical and chemical index of straw pulp receives processing conditions is very big, for example:
At open source literature; The multiple factor that influences paper performance is disclosed in the literary composition that " influences the factor of paper physical property ", wherein relate to processing technology to the factor of paper because not in discussion scope of the present invention, factor is omitted at this; What be introduced in the present invention is the influence of beating degree to paper physical property; Can learn from the document, the fracture length of paper the initial beating-up period rise very soon, slowly get off gradually later on; Produce decline on the contrary after having arrived certain numerical value, folding strength, bursting strength, tearability also are like this; The air permeability of paper reduces along with the increase of beating degree; Making beating can reduce whiteness, and the low more whiteness of freedom is just fallen, and the high more whiteness of freedom also increases.
Usually, those skilled in the art will pass through the paper pulp that methods such as chemical method or Mechanical Method make, and be called natural color pulp, and described natural color pulp is generally yellow or brown.Prior art is thought, satisfy the instructions for use of paper, must bleach processing to paper pulp, makes paper have higher whiteness.Bleached pulp method commonly used has two kinds: a kind of is oxidative bleaching method, and another kind is the reducing bleach method, can not slurry be floated to the whiteness of appointment when a kind of method of use in the bleaching practice; Can also adopt multiple method for bleaching; That is, multistage bleaching, as three sections float, five sections float etc.But bleaching changes the physical and chemical parameter of paper pulp, referring to accompanying drawing 11, causes prepared paper pulp can't carry out the contrast of stable physical and chemical parameter.
The characteristic of Straw Pulp points out becoming paper The properties (2000.4. gansu science and technology .17) with water retention value, and straw pulp in use generally need not be pulled an oar or light beating gets final product.In conjunction with the open source literature of aforesaid prior art, making beating also is tangible to the influence of the physical and chemical parameter of paper pulp.
Bulk is meant same grammes per square metre page thickness, and high bulk can make page show thick, can reduce page quantification, practices thrift cost.Research shows that the bulk of paper has determined the opacity and the deflection of paper to a great extent, and duplicator and printer require paper to have higher deflection or bulk so that paper can waltz through these equipment.There are several kinds of feasible methods to improve the bulk of paper, for example, in slurry, add polymer; Operate through different processes; People such as Rtt have studied the influence to the paper tightness of high temperature and soft pressure; People such as Nynren have studied mechanical pulp and change machine slurry is found, dry under different temperature like paper, its bulk has very big difference; It will be at present effective method that the high yield pulp (HYP) that use has a high bulk improves the paper bulk.Produce in printing and the writing paper in the mixed pulp of using herb slurry or straw pulp and other slurries,, not only can improve the bulk of paper, also can improve paper opacity and formation of sheet through adding the straw pulp of high bulk.Use high bulk straw pulp cheaply, not only improved the quality of paper, and production cost is descended.
Folding strength is to paper strength and flexible comprehensive measurement index, and this index particularly needs the dry printed matter of thermosetting to printing paper and cardboard, and is even more important when online folding.Because page during through drying section sharply dehydration become fragile, breakage problem appears in page when being prone to cause folding.Folding strength is meant that paper and cardboard under certain tension force, can stand 180 ° reciprocal folding times.Represent with reciprocal folding times.Folding strength is represented the anti-gentle folding ability of paper, and the tearability of it and paper has certain relation.Fibre strength has great influence to folding strength, has result of study to show, folding strength is directly proportional with 6～8 powers of fibre strength.In addition, paper quantitatively, thickness, tightness and moisture etc. are also very big to the influence of folding strength.Slurry of the same race is copied the paper of the same race of system, and within the specific limits, when thickness and quantitative increasing, folding strength will obviously descend; Every paper that need fold often in use, comparatively strict to the requirement of folding strength.Very high as the folding strength of bank-note paper, boxboard is required, the folding strength of the how general cultural printing of biographies such as tracing paper, writing paper, letterpress paper, paper for covering books, wrapping paper all there is certain requirement.
Whiteness is for printing paper and writing paper particular importance.But difference along with purposes.Requirement for whiteness is also different.Gravure paper particularly; Paper such as art post paperboard, spy's tissue paper require whiteness more than 90%; Paper such as offset printing paper, loan, bond paper, magazine paper, senior typing paper require whiteness more than 80%; Letterpress paper, general writing paper, glazed paper require whiteness between 60～70%, and it is 45～50% that newsprint requires whiteness.How the whiteness of natural-color straw pulp being provided or improving its form and aspect, as a kind of environmental protection concept and reduce the injury to eyes, is Development Trend recently and in the future.
In sum, straw pulp has shortcomings such as bulk, air permeability and whiteness are lower, the stock quality fluctuation is big; Simultaneously, bleaching and making beating have tangible influence to the physicochemical property of straw pulp, cause straw pulp can't have stable performance.
In view of this, special proposition the present invention.
Summary of the invention
Main purpose of the present invention is to provide a kind of natural-color straw pulp of form and aspect, bulk and folding strength and stable performance of improvement;
Another object of the present invention is to provide the application of a kind of said straw pulp in mixed pulp;
Another object of the present invention is to provide the application of a kind of said straw pulp in paper products.
In order clearly to define the difference between prior art and the present invention; The present invention is made to give a definition; That is, natural-color straw pulp of the present invention is meant, only is meant; The paper pulp that adopts straw, wheat straw, reed, giantreed, bagasse, cotton stalk and their mixture to process as raw material comprises the slurry that obtains after boiling, shove, the washing; Perhaps boiling, shove, wash and discongest the slurry that obtains; Perhaps boiling, shove, wash, discongest the slurry that obtains with oxygen delignification.
Natural-color straw pulp of the present invention is meant, only is meant, the paper pulp that preferably adopts straw, wheat straw, reed and their mixture to process as raw material comprises the slurry that obtains after boiling, shove, the washing; Perhaps boiling, shove, wash and discongest the slurry that obtains; Perhaps boiling, shove, wash, discongest the slurry that obtains with oxygen delignification.
Natural-color straw pulp of the present invention is meant, only is meant, the paper pulp that preferably adopts straw, wheat straw, reed and their mixture to process as raw material.
Purpose of the present invention can be achieved in the following manner:
Be applicable to that preferably pulping process of the present invention comprises boiling, shove, washs, discongests and oxygen delignification.Be applicable to that boiling method of the present invention comprises any in ammonium sulfite boiling, anthraquinone-soda cooking, kraft cooking or the boiling of alkaline sodium sulfite method.
Concrete, if adopt the concrete parameter of boiling in batch (-type) spherical boiler or the continuous steamer following:
When adopting the ammonium sulfite boiling, in the grass kind plant raw material, add cooking liquor, wherein the ammonium sulfite consumption is the 9-13% to the over dry material quantity, and liquor ratio is 1: 2-4.Feed the Steam Heating temperature to 165-173 ℃, then little venting, insulation, omnidistance time 160-210 minute.
When adopting anthraquinone-soda cooking, 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: 2-4, the anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity.Feed Steam Heating and be warming up to 160-165 ℃, then little venting, insulation, omnidistance time 140-190 minute.
When adopting kraft cooking, 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: 2-4, sulphidity are 5-8%.Feed Steam Heating and be warming up to 165-173 ℃, then little venting, insulation, omnidistance time 150-200 minute.
When adopting the boiling of alkaline sodium sulfite method; In the dogstail raw material, add 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: 3-4.Feed Steam Heating then and be warming up to 160-165 ℃, then little venting, insulation, omnidistance time 140-190 minute.
Concrete, if adopt the concrete parameter of vertical digester boiling following:
When adopting the ammonium sulfite boiling, in the grass kind plant raw material, add cooking liquor, wherein the ammonium sulfite consumption is the 9-15% to the over dry material quantity, and liquor ratio is 1: 6-10.Said grass kind plant raw material is packed in the digester through 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.
When adopting anthraquinone-soda cooking, 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: 6-10, the anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity.Said grass kind plant raw material is packed in the digester through 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, and an air of discharging simultaneously in the pot also boosts to 0.4-0.6MPa, and 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.
When adopting kraft cooking, 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%.Said grass kind plant raw material is packed in the digester through 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, and an air of discharging simultaneously in the pot also boosts to 0.5-0.65MPa, and 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.
When adopting the boiling of alkaline sodium sulfite method, in the dogstail raw material, add steaming preparation, 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.The dogstail raw material is packed in the digester through packer by hot black liquor; After the dress pot is full, close pot cover; Replenishing temperature in the digester is 145 ℃ of steaming preparations, and an air of discharging simultaneously in the pot also boosts to 0.45-0.6MPa, and 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.
The permanganate number 16-28 of the slurry that obtains after the above-mentioned boiling of process, beating degree is 10-24 ° of SR, belongs to high-hardness pulp; Permanganate number 16-23 preferably, beating degree is 10-24 ° of SR.
Through shove, slurry after washing, discongesting, change oxygen delignification over to, promptly; Described high-hardness pulp is delivered to the oxygen delignification reaction tower, and add NaOH and carry out oxygen delignification with oxygen and react, obtaining hardness is permanganate number 7-16K; Preferred 8-15K, the more preferably slurry of 8-14K.Preferred oxygen delignification is the single hop oxygen delignification, uses an oxygen delignification reaction tower; Described 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; 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.
The straw pulp of method for preparing has form and aspect, bulk and the folding strength of improvement, and described bulk is 1.4-3cm
3/ g; Folding strength 15-120 time, form and aspect L/a/b72-87/1.2-3.2/10-20.Described bulk is preferably 1.5-2.5cm
3/ g; Preferred 20-95 time of folding strength, the preferred 75-84/1.5-3.0/11-19 of form and aspect L/a/b.Described bulk is 1.6-2.1cm more preferably
3/ g; Folding strength is 25-90 more preferably, and form and aspect L/a/b is 77-82/1.6-2.9/12-18 more preferably.The whiteness of described natural-color straw pulp is 28-54%, preferred 32-50%, more preferably 33-45%.The hardness 7-16K of described natural-color straw pulp, preferred 8-15K, more preferably 8-14K.Can add known paper making additive in the described natural-color straw pulp.
The invention has the advantages that:
1, form and aspect or whiteness are significantly improved;
2, bulk is higher;
3, folding strength is higher;
4, stock quality fluctuation is little, the natural-color straw pulp that obtains therefrom the slurry data more stable.
Description of drawings
Below be description of drawings of the present invention, can better understand the present invention through following explanation
Accompanying drawing 1 is the opacity comparative parameter of contrast with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 2 is contrast bulk comparative parameters with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 3 is contrast air permeability comparative parameters with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 4 is contrast tensile index comparative parameters with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 5 is contrast tear index comparative parameters with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 6 is contrast folding strength comparative parameters with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 7 is contrast freedom comparative parameters with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 8 is contrast whiteness comparative parameters with bleaching straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 9 is contrast form and aspect comparative parameters with bleaching straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 10 is contrast hardness comparative parameters with natural-color straw pulp and natural-color straw pulp of the present invention;
Accompanying drawing 11 be prior art with the otherness of various parameters between the straw pulp of different modes bleaching and the natural-color straw pulp relatively;
Below be the specific embodiment of the present invention and comparative example,, can better understand the present invention through following description.
The specific embodiment
Experiment method
This experiment method is meant; The data of measuring in the present invention; Described natural-color straw pulp is meant, only is meant the paper pulp that adopts straw, wheat straw, reed, giantreed, bagasse, cotton stalk and their mixture to process as raw material; Preferably, described raw material is straw, wheat straw, reed, giantreed and their mixture.
Using this case applicant's technology in early stage, is in the slurrying section, carries out material choice → boiling defibre → washing according to above-mentioned definition; Resulting paper pulp is referred to as contrast in the present invention and uses natural-color straw pulp.Certainly, this case applicant's of the present invention early stage is technological, can think the part of prior art.
Adopting technology of the present invention, also is in the slurrying section, carries out material choice → boiling defibre → washing according to above-mentioned definition; Perhaps
Adopt researcher of the present invention at the pulping process of applying for before this; For example: CN200710143130.0 (a kind of oxygen delignify treating method of grass group unbleached chemical pulp), CN200710143131.5 (washing process in a kind of grass pulping process), CN200710143133.4 (a kind of method of the grass kind plant raw material being carried out the high-hardness pulp extruding black liquor of gained after the boiling), CN200710129635.1 (a kind of is the high-hardness pulp and preparation method thereof of feedstock production with the grass kind plant), CN200710143129.8 (a kind of is the bleach chemical pulp and preparation method thereof of feedstock production with the grass kind plant), CN200710143132.X (a kind of is paper pulp of raw material and preparation method thereof with straw and wheat straw), CN200710129634.7 (a kind of carding process that is used for dogstail raw material production bleach chemical pulp) also are introduced at this.Specifically: carry out material choice → get the raw materials ready → boiling → shove → wash → discongest → oxygen delignification → washing according to above-mentioned definition; The paper pulp that this mode obtains is referred to as natural-color straw pulp of the present invention in the present invention.
After obtaining described natural-color straw pulp, under laboratory condition, it to be washed to pH value 6.5-7.5, preferred washing is to neutral; Becoming on the page or leaf machine to become page or leaf, carry out the detection of said index again according to the mode of prior art then.Then, make an experiment, perhaps make an experiment according to relevant criterion according to following standard.
| Standard No. | Standard name |
| GB/T?457-2008 | The mensuration of paper and cardboard folding strength |
| GB/T?458-2008 | The mensuration of paper and cardboard air permeability |
| GB/T?12660-2008 | The mensuration of Pulp Drainage Properties " canadian standard " freedom method |
| GB/T?12914-2008 | The mensuration of paper and cardboard tensile strength |
| GB/T?1545.1-2003 | The mensuration of paper, cardboard and pulp-water extract pH |
| GB/T?1545.2-2003 | The mensuration of paper, cardboard and pulp-water extract acidity or alkalinity |
| GB/T?10739-2002 | The standard atmosphere condition that paper, cardboard and paper pulp sample are handled and tested |
| GB/T?7975-2005 | The mensuration of paper and cardboard color (diffuse reflection method) |
| GB/T?7974-2002 | Mensuration diffusion/the normal beam technique of paper, cardboard and brightness of pulp (whiteness) |
| GB/T?1546-1989 | The determination method of paper pulp kappa number |
Point out that as, " characteristic of Straw Pulp with water retention value to becoming the paper The properties " (2000.4. gansu science and technology .17) straw pulp in use generally need not be pulled an oar or light beating gets final product.
Contrast described in specification of the present invention or the accompanying drawing is meant with bleaching straw pulp, adopts the straw pulp of prior art or applicant's of the present invention early stage technology preparation, after the common process bleaching, is referred to as contrast and uses bleaching straw pulp.
Researcher of the present invention finds that the physicochemical property of straw pulp receives the influence of various factors very big, even with the natural-color straw pulp of a collection of taking-up; The otherness of the data of the different detections that detect batch is very big, perhaps, places the regular hour; The otherness of the various parameters of sample is also very big, even technology is identical, because the raw material different batches that different time drops into; Detected data also have very big otherness, still, and in the detection of natural-color straw pulp of the present invention; The trend of various data is consistent, therefore can assert that natural-color straw pulp of the present invention has stronger stability.
Many indexs of natural-color straw pulp of the present invention all are a kind of trend scopes, under the influence of irregular raw material; Almost be difficult to obtain absolute value; Therefore, see that the present invention has the terrible various indexs of improvement than prior art from trend; Therefore, natural-color straw pulp of the present invention is creative.
Embodiment
Present embodiment is the conditions of cooking among the preparation technology of said natural-color straw pulp of the present invention, and described embodiment is in order to further describe the present invention, rather than restriction the present invention.Wherein:
Embodiment 1-6 adopts the ammonium sulfite boiling
Table ten one, ammonium sulfite boiling parameter
| |
1 | 2 | 3 | 4 | 5 | 6 | |
| Raw material | Wheat straw | Straw | Reed | Giantreed | Cotton | Wheat straw | 50 |
| Alkali number (NaOH meter) % | 0 | 5％ | 2％ | 8％ | 6％ | 3％ | |
| |
9％ | 10％ | 14％ | 15％ | 12％ | 13 | |
| Liquor ratio | |||||||
| 1∶6 | 1∶10 | 1∶8 | 1∶9 | 1∶7 | 1∶3 | ||
| Temperature ℃ | 156 | 162 | 173 | 167 | 158 | 171 | |
| Pressure MPa | 0.6 | 0.62 | 0.75 | 0.68 | 0.64 | 0.72 | |
| Digestion time min | 180 | 190 | 220 | 210 | 200 | 195 |
Embodiment 7-13 adopts the caustic soda-anthraquinone method boiling
Table ten two, caustic soda-anthraquinone boiling parameter
| |
7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Raw material | Wheat straw | Straw | Wheat straw: giantreed 70: 30 | Straw: reed 70: 30 | Straw: wheat straw 60: 40 | Straw: wheat straw 70: 30 | Wheat straw: reed 40: 60 |
| Alkali number (NaOH meter) | 10％ | 12％ | 13％ | 16％ | 9％ | 7％ | 11％ |
| Anthraquinone consumption (%) | 0.06％ | 0.075％ | 0.065％ | 0.08％ | 0.08％ | 0.055％ | 0.05 |
| Liquor ratio | |||||||
| 1∶2 | 1∶3 | 1∶5 | 1∶10 | 1∶4 | 1∶8 | 1∶6 | |
| Idle running (min) | 30 | 20 | 15 | 25 | 40 | 35 | 30 |
| Pressure (kPa) | 460 | 350 | 400 | 450 | 430 | 370 | 470 |
| Temperature (℃) | 175 | 130 | 140 | 175 | 160 | 130 | 175 |
| Heating-up time (min) | 80 | 70 | 90 | 50 | 70 | 90 | 100 |
| Temperature retention time (min) | 170 | 30 | 50 | 60 | 60 | 100 | 120 |
| Digestion time (min) | 250 | 100 | 140 | 110 | 130 | 190 | 220 |
Embodiment 14-21 adopts kraft cooking
Table ten three, kraft cooking parameter
Embodiment 22-26 adopts the boiling of alkaline sodium sulfite method
Table ten four, alkaline sodium sulfite method boiling parameter
The permanganate number 16-28 of the slurry that obtains after the above-mentioned boiling of process, beating degree is 10-24 ° of SR, belongs to high-hardness pulp; Permanganate number 16-23 preferably, beating degree is 10-24 ° of SR.
Through shove, slurry after washing, discongesting; Change oxygen delignification over to; Oxygen delignification mainly is meant oxygen delignification itself and does not comprise the possible bleaching factor that it contains in the present invention, according to description of the invention, even adopt described oxygen delignification; Still need wash and bleach, therefore can distinguish with traditional bleaching.Described high-hardness pulp is delivered to the oxygen delignification reaction tower, and add NaOH and carry out oxygen delignification with oxygen and react, obtain the slurry that hardness is permanganate number 8.7-13.2.Preferred oxygen delignification is the single hop oxygen delignification, uses an oxygen delignification reaction tower; Described 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; 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.
Embodiment 27
Present embodiment is the further additional embodiment to the pulp-making test of straw
1, test raw material
Straw: raw material section sampling
The sampling of caustic soda (400g/l) workshop
The sampling of anthraquinone derivative workshop
Hydrogen peroxide (30%) laboratory sample
2, digesting technoloy and data:
3, oxygen delignification technology and result
Utilize 15 liters of digesters to carry out oxygen delignification in the laboratory.Oxygen delignification technology is seen table:
Index is seen table behind the oxygen delignification:
4, screening:
Utilize the laboratory slotted screen to screen, sieve seam is 0.3mm, respectively to the slurry behind the oxygen delignification and not the slurry of oxygen delignification directly screen.
5, the sheet data are copied in the making beating of the slurry behind the straw oxygen delignification:
6, form and aspect numerical value:
Embodiment 28
Present embodiment is the further additional embodiment to the reed pulp-making test.
1, test raw material
Reed: raw material section sampling
The sampling of caustic soda (400g/l) workshop
The sampling of anthraquinone derivative workshop
Hydrogen peroxide (30%) laboratory sample
2, digesting technoloy and data:
3, oxygen delignification technology and result
Utilize 15 liters of digesters to carry out oxygen delignification in the laboratory.Oxygen delignification technology sees the following form:
Index is seen table before and after the oxygen delignification:
4, screening:
Utilize the laboratory slotted screen to screen, sieve seam is 0.3mm, respectively slurry behind the oxygen delignification and oxygen-delignified pulp is not directly screened.
5, the sheet data are copied in the slurry making beating making beating of crossing of reed oxygen delignification:
| Beating degree ° SR | 17°SR | 23°SR | 28°SR | 36° |
| Freedom CFS | ||||
| 600 | 520 | 470 | 410 | |
| Weight in wet base g | 3.0 | 2.6 | 2.2 | 2.0 |
| Quantitative g/ |
60 | 60 | 60 | 60 |
| Whiteness %ISO | 37.25 | 37.25 | 37.25 | 37.25 |
| Bulk cm 3/g | 2.585 | 2.370 | 2.469 | 2.174 |
| Air permeability ml/min | 7289 | 3038 | 2764 | 4728 |
| Fracture length Km | 3.510 | 4.119 | 4.337 | 5.628 |
| Tearability mN | 397.8 | 507.1 | 481.4 | 472.8 |
| Folding strength (inferior) | 14 | 35 | 23 | 151 |
| Tensile index N.m/g | 34.398 | 40.366 | 42.502 | 55.154 |
| Tear index mN.m2/g | 6.60 | 8.40 | 8.00 | 7.88 |
6, reed not the slurry making beating of oxygen delignification copy the sheet data:
| Beating degree ° SR | 17°SR | 23°SR | 28°SR | 36°SR |
| Freedom CFS | 640 | 550 | 480 | 430 |
| Weight in wet base g | 3.1 | 3.1 | 2.8 | 2.0 |
| Quantitative g/ |
60 | 60 | 60 | 60 |
| Whiteness %ISO | 29.6 | 29.6 | 29.6 | 29.6 |
| Bulk cm 3/g | 2.732 | 2.573 | 2.577 | 2.256 |
| Air permeability ml/min | 8409 | 3685 | 6359 | 1415 |
| Fracture length Km | 2.349 | 4.247 | 4.623 | 5.964 |
| Tearability mN | 452.2 | 459.9 | 443.1 | 511 |
| Folding strength (inferior) | 9 | 20 | 13 | 220 |
| Tensile index N.m/g | 23.020 | 41.621 | 45.305 | 58.447 |
| Tear index mN.m2/g | 7.54 | 7.67 | 7.39 | 8.52 |
7, form and aspect:
Embodiment 29
Present embodiment is the further additional embodiment to the cotton stalk pulp-making test
1, test raw material
Cotton stalk: provide raw material for oneself, carry out craft and get the raw materials ready.
The sampling of caustic soda (400g/l) workshop
The sampling of anthraquinone derivative workshop
Hydrogen peroxide (30%) laboratory sample
2, digesting technoloy and data:
3, oxygen delignification technology and result
Utilize 15 liters of digesters to carry out oxygen delignification in the laboratory, oxygen delignification technology is seen table:
Index is seen table before and after the oxygen delignification:
4, screening:
Utilize the laboratory slotted screen to screen, sieve seam is 0.3mm, respectively to the slurry behind the oxygen delignification and not the slurry of oxygen delignification directly screen.
5, the cotton stalk pulp behind the oxygen delignification is copied the sheet data:
6, the sheet data are not copied in the making beating of the cotton stalk pulp of oxygen delignification:
7, form and aspect:
Comparative example 1
What this comparative example detected is the opacity of natural-color straw pulp, and the mode of sample acquisition process and test is carried out according to aforesaid test method, and in this comparative example, described opacity can adopt aforesaid test method that the opacity of the above is detected.
The opacity actual measurement parameter of table one contrast natural-color straw pulp and natural-color straw pulp of the present invention
| Contrast natural-color straw pulp (%) (sample obtains with random order according to the present invention's definition, and records following parameter) | The following data of natural-color straw pulp of the present invention (%) in order, |
| 85.6 | 90 |
| 86 | 91.1 |
| 86.4 | 97.1 |
| 85.5 | 93 |
| 82.9 | 93.9 |
| 85.9 | 94.1 |
| 86 | 100 |
| 83.8 | 92.4 |
| 86.1 | 99.9 |
| 84.5 | 95 |
Comparative example 2
What this comparative example detected is the bulk index of natural-color straw pulp of the present invention, and in this comparative example, described opacity can adopt aforesaid test method that described opacity is detected.
The bulk actual measurement parameter of table two contrast natural-color straw pulp and natural-color straw pulp of the present invention
| Contrast natural-color straw pulp (cm 3/ g) (sample obtains with random order according to the present invention's definition, and records following parameter) | Natural-color straw pulp (cm of the present invention
3/ g) following data in order, |
| 1.4 | 1.4 |
| 1.3 | 1.5 |
| 1.7 | 1.6 |
| 2 | 2.572 |
| 1.7 | 2.623 |
| 1.94 | 2.631 |
| 1.941 | 2.65 |
| 1.4 | 3 |
| 1.5 | 2.5 |
| 1.5 | 2.1 |
Comparative example 3
What this comparative example detected is the air permeability index of natural-color straw pulp of the present invention, and in this comparative example, described air permeability can adopt aforesaid test method that described air permeability is detected.
The air permeability actual measurement parameter of table three contrast natural-color straw pulp and natural-color straw pulp of the present invention
| Contrast natural-color straw pulp (ml/min) (sample obtains with random order according to the present invention's definition, and records following parameter) | The following data of natural-color straw pulp of the present invention (ml/min) in order, |
| 30 | 350 |
| 452 | 60 |
| 37 | 110 |
| 550 | 150 |
| 55 | 1200 |
| 170 | 760 |
| 330 | 900 |
| 33 | 70 |
| 500 | 800 |
| 41 | 50 |
Comparative example 4
What this comparative example detected is the tensile index index of natural-color straw pulp of the present invention, and in this comparative example, described tensile index can adopt aforesaid test method that described tensile index is detected.
Table four contrast is with the tensile index actual measurement parameter of natural-color straw pulp and natural-color straw pulp of the present invention
| (sample defines to appoint according to the present invention with natural-color straw pulp (N.m/g) in contrast | The following data of natural-color straw pulp of the present invention (N.m/g) in order, corresponding embodiment |
| Meaning is obtained in proper order, and records following parameter) | 1、2、7、8、14、15、22、23、11、12 |
| 28.15 | 56 |
| 29.78 | 38 |
| 31.42 | 40 |
| 36.75 | 50 |
| 37 | 68 |
| 27 | 70 |
| 39 | 49 |
| 38 | 65 |
| 39 | 53 |
| 29 | 35 |
Comparative example 5
What this comparative example detected is the tear index index of natural-color straw pulp of the present invention, and in this comparative example, described tear index can adopt aforesaid test method that described tear index is detected.
Table five contrast is with the tear index actual measurement parameter of natural-color straw pulp and natural-color straw pulp of the present invention
| Contrast is with natural-color straw pulp (mN.m 2/ g) (sample obtains with random order according to the present invention's definition, and records following parameter) | Natural-color straw pulp (mN.m of the present invention
2/ g) following data in order, |
| 3.77 | 5.5 |
| 2.3 | 4.97 |
| 4.4 | 2.9 |
| 2.5 | 3.098 |
| 4.16 | 4.107 |
| 2.2 | 3.3 |
| 3.811 | 4.616 |
| 2.7 | 4.735 |
| 3.867 | 4.809 |
| 4.142 | 3.8 |
| 2.6 | 4.862 |
| 2.9 | 2.7 |
| 4.244 | 4.3 |
| 2.4 | 5.2 |
| 4.714 | 5.4 |
| 2.2 | 2.5 |
Comparative example 6
What this comparative example detected is the folding strength index of natural-color straw pulp of the present invention, and in this comparative example, described folding strength can adopt aforesaid test method that described folding strength is detected.
Table six contrast is with the folding strength actual measurement parameter of natural-color straw pulp and natural-color straw pulp of the present invention
| Contrast is with natural-color straw pulp (inferior) (sample obtains with random order according to the present invention's definition, and records following parameter) | The following data of natural-color straw pulp of the present invention (inferior) in order, |
| 10 | 36 |
| 17 | 70 |
| 8 | 22 |
| 14 | 30 |
| 9 | 10 |
| 10 | 57 |
| 7 | 50 |
| 11 | 43 |
| 9 | 60 |
| 7 | 20 |
Comparative example 7
What this comparative example detected is the freedom index of natural-color straw pulp of the present invention, and in this comparative example, described freedom can adopt aforesaid test method that described freedom is detected.
Table seven contrast is with the freedom actual measurement parameter of natural-color straw pulp and natural-color straw pulp of the present invention
| Contrast is with natural-color straw pulp (ml) (sample obtains with random order according to the present invention's definition, and records following parameter) | The following data of natural-color straw pulp of the present invention (ml) in order, |
| 370 | 350 |
| 380 | 485 |
| 330 | 400 |
| 420 | 505 |
| 330 | 470 |
| 450 | 480 |
| 360 | 490 |
| 330 | 460 |
| 320 | 375 |
| 450 | 450 |
Comparative example 8
What this comparative example detected is the whiteness index of natural-color straw pulp of the present invention, and in this comparative example, described whiteness can adopt aforesaid test method that described whiteness is detected.
The whiteness of paper or cardboard is meant white or near paper or the paperboard surface of the white reflectivity to blue light, and relatively recently representes with the surperficial reflectivity of blue light illumination magnesia on-gauge plate.
Table eight contrast is with the whiteness actual measurement parameter of bleaching straw pulp and natural-color straw pulp of the present invention
| Contrast is with bleaching straw pulp (%) (sample obtains with random order according to the present invention's definition, and records following parameter) | The following data of natural-color straw pulp of the present invention (%) in order, |
| 66.7 | 46.3 |
| 79.2 | 45 |
| 77.3 | 52 |
| 74.9 | 40.8 |
| 77.2 | 42.7 |
| 77.2 | 30 |
| 73.1 | 51.3 |
| 78 | 50 |
| 78.7 | 33 |
| 68.4 | 54 |
Comparative example 9
What this comparative example detected is the form and aspect index of natural-color straw pulp of the present invention, and in this comparative example, described form and aspect can adopt aforesaid test method that described form and aspect are detected.
Form and aspect are the absolute color that are used for representing paper, L, a, b value that a certain particular color is corresponding concrete.This index can be expressed the impression of human eye dialogue degree and form and aspect more exactly; It is to use datumization to describe the system of form and aspect (color); In Hunter Lab system, L, a, b are calculated by above tristimulus values, and L (L=10Y015) is the measurement unit of lightness; (a=1715's (1102X-Y)/Y015) is red on the occasion of representing, and negative value is represented green for a; (b=710's (Y-01847Z)/Y015) is yellow on the occasion of representing, and negative value is represented blue for b.
Table nine contrast is with the form and aspect actual measurement parameter of bleaching straw pulp and natural-color straw pulp of the present invention
| Contrast is with bleaching straw pulp L (sample obtains with random order according to the present invention's definition, and records following parameter) | Bleaching straw pulp a is used in contrast | Bleaching straw pulp b is used in contrast | The following data of natural-color straw pulp L of the present invention in order, |
Natural-color straw pulp a of the present invention | Natural-color straw pulp b of the present invention |
| 90.34 | 0.03 | 5.47 | 85 | 3.14 | 19 |
| 90.77 | 0.11 | 5.68 | 84 | 1.33 | 11 |
| 91.16 | 0.19 | 5.86 | 77 | 2.9 | 10.44 |
| 92.1 | 0.23 | 6.19 | 82 | 1.5 | 10 |
| 92.46 | 0.31 | 6.34 | 74.72 | 3 | 18.52 |
| 93.34 | 0.47 | 6.5 | 75 | 2.61 | 14.13 |
| 93.82 | 0.56 | 6.83 | 77.18 | 1.6 | 18 |
| 94.01 | 0.61 | 7.1 | 79.72 | 1.9 | 20 |
| 94.27 | 0.79 | 7.56 | 72 | 3.14 | 12 |
| 94.47 | 0.86 | 7.98 | 87 | 3.2 | 19.11 |
Comparative example 10
What this comparative example detected is the hardness number of natural-color straw pulp of the present invention, and in this comparative example, described hardness can adopt aforesaid test method that described hardness is detected.
Pulp hardness (hardness of pulp) is one of quality index of chemical pulp, the degree that non-fibrous material (mainly being lignin) is removed in the expression paper pulp.Commonly used have card primary (Kappa) valency and two kinds of methods of permanganate number, and the both is based on the oxidation of the sour potassium of permanganic acid to non-fibrous material.The former is the 1 gram oven dry stock consumption (in milliliter) of (25 ℃ time 10 minutes) 0.02 rubbing of being consumed/rising potassium manganate standard liquid under certain condition, how in order to the hardness of expression true qualities wood pulp.The latter is the 1 gram oven dry stock consumption (in milliliter) of (25 ℃ time 5 minutes) 0.02 rubbing of being consumed/rising potassium manganate standard liquid under certain condition, how needs the hardness of the non-wood-fiber paper pulp (like straw pulp) of bleaching in order to expression.
Pulp hardness is higher, and then by the material of potassium permanganate oxidation the more, the consumption of the outer solution of permanganic acid is bigger, and bleaching more is not easy, but the mechanical strength of paper pulp is also higher.The permanganate number that generally can float straw pulp is 9 ~ 14, and semi-chemical pulp is 15～18, and the true qualities hard stock is then more than 20.
The hardness actual measurement parameter of table ten natural-color straw pulp of the present invention
| The following data of natural-color straw pulp hardness of the present invention (K) in order, |
| 16 |
| 7 |
| 9.6 |
| 8 |
| 10.7 |
| 11.1 |
| 14 |
| 12.4 |
| 13 |
| 15 |
Claims (13)
1. the natural-color straw pulp of the form and aspect of an improvement, bulk and folding strength and stable performance is characterized in that, described bulk is 1.5～2.5cm
3/ g, folding strength 20～95 times, form and aspect L/a/b 75～84/1.5～3.0/11～19.
2. natural-color straw pulp according to claim 1 is characterized in that, described bulk is 1.6～2.1cm
3/ g, folding strength 25～90 times, form and aspect L/a/b 77～82/1.6～2.9/12～18.
3. natural-color straw pulp according to claim 1 is characterized in that the whiteness of described natural-color straw pulp is 28～54%.
4. natural-color straw pulp according to claim 3 is characterized in that the whiteness of described natural-color straw pulp is 32～50%.
5. natural-color straw pulp according to claim 4 is characterized in that the whiteness of described natural-color straw pulp is 33～45%.
6. natural-color straw pulp according to claim 1 is characterized in that, the hardness of described natural-color straw pulp is 7～16K.
7. natural-color straw pulp according to claim 6 is characterized in that, the hardness of described natural-color straw pulp is 8～15K.
8. natural-color straw pulp according to claim 7 is characterized in that, the hardness of described natural-color straw pulp is 8～14K.
9. natural-color straw pulp according to claim 1 is characterized in that, the raw material of described natural-color straw pulp is meant the paper pulp that straw, wheat straw, reed, giantreed, bagasse, cotton stalk and their mixture are processed as raw material.
10. natural-color straw pulp according to claim 9 is characterized in that, the raw material of described natural-color straw pulp is meant the paper pulp that straw, wheat straw and their mixture are processed as raw material.
11. according to the described natural-color straw pulp of the arbitrary claim of claim 1～10, it is characterized in that, add known paper making additive in the described natural-color straw pulp.
12. any application of described natural-color straw pulp in paper products of claim 1～10.
13. any application of described natural-color straw pulp in mixed pulp of claim 1～10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1580395A (en) * | 2004-05-18 | 2005-02-16 | 岳阳纸业股份有限公司 | Light printing paper and its manufacture method |
| CN101082187A (en) * | 2007-08-03 | 2007-12-05 | 山东泉林纸业有限责任公司 | Oxygen delignify treating method for grass group unbleached chemical pulp |
| CN101353874A (en) * | 2007-12-05 | 2009-01-28 | 山东福荫造纸环保科技有限公司 | Offset printing paper made from grass pulp and preparation thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1580395A (en) * | 2004-05-18 | 2005-02-16 | 岳阳纸业股份有限公司 | Light printing paper and its manufacture method |
| CN101082187A (en) * | 2007-08-03 | 2007-12-05 | 山东泉林纸业有限责任公司 | Oxygen delignify treating method for grass group unbleached chemical pulp |
| CN101353874A (en) * | 2007-12-05 | 2009-01-28 | 山东福荫造纸环保科技有限公司 | Offset printing paper made from grass pulp and preparation thereof |
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