CN101760985B - High-opacity mixed pulp and cultural paper prepared from the same - Google Patents
High-opacity mixed pulp and cultural paper prepared from the same Download PDFInfo
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Abstract
The weight of high-opacity straw pulp accounts 20 to 98 percent of the weight of mixed pulp, and preferably, the high-opacity straw pulp has the mixed pulp content between 60 and 95 percent. The invention provides cultural paper with the whiteness between 45 and 70 percent, the preferable whiteness is between 50 and 65 percent, and the opacity is larger than 90 percent. Because unbleached straw pulp is mixed in the mixed pulp, the consumption of wood pulp and the like is reduced, the process avoids the environment pollution caused by bleaching agents and generated harmful materials to human bodies in the bleaching process, the prepared paper product nearly contains no harmful material to human bodies, the cost of paper production is greatly reduced, the opacity of the paper is high, the aging degree of the whiteness is also greatly reduced, and the paper is not easy to become yellow.
Description
Technical field
The present invention relates to a kind of paper grade (stock) mixed slurry, relate to a kind of mixed pulp particularly, and this mixed pulp is copied the paper of processing with high opacity.
Background technology
In the raw material structure of China's papermaking paper industry, raw material mainly comprises wood pulp, secondary stock and non-wood pulp, and along with the rapid expansion of domestic paper demand promotion production capacity, the raw material demand increases fast.Yet the long-term rigidity that is limited by domestic timber resources is rare, the timber price continuous rise, and wood pulp output can not satisfy paper industry demand far away.Simultaneously, because domestic waste paper reclaims the waste paper that does not become scale and quality to reclaim not as former wood pulp production as yet.So paper industry is advocated with non-wood pulp and is replaced the cost of wood pulp with the reduction paper products at present, and satisfies the demand to paper.
Mainly comprise string at the paper grade (stock) fiber, like lumber fibre, grass fiber, cotton fibriia etc., and non-plant fibre, like chemical fibre, inorfil, microorganism fiber etc.Different kinds of fibers and characteristic, its paper properties difference is very big, in order to satisfy the demand of various paper performances, often need the fiber mixing of various characteristics be used, and brings into play its characteristic and replenishes its deficiency.Satisfying outside the demand of paper performance, reduce the cost of paper as much as possible, reduce it and in the preparation process, environment is polluted, paper product is more favourable to the health of human body.
The opacity of paper is one of optical property of paper; It also is an important quality index of printing paper, writing paper, loan and some industrial and technical papers; Requirement has higher opacity; For cultural printing, opacity is hanged down and will be caused occurring shadow-mark, print through phenomenon, and influence is used.The factor that influences the paper opacity mainly contains the character and the refining pulp quality of fibrous raw material, raw material, filler; With regard to fibrous raw material, to compare with cellulose, the index of refraction of lignin is higher; Light absorbing ability is also stronger, so big many of the paper opacity that the paper that natural color pulp is fried is copied than bleached pulp; Under the identical situation of lignin content, fiber is short and small, adhesion is poor, become the paper bulky, hole is many, helps the absorption and the scattering of light, so become paper opaque also high.Pulping process is to the influence of paper opacity, along with making beating is carried out, and the fiber finer fibration; Specific area increases, and has improved to become the tightness and the intensity of paper, and has reduced the non-binding area of the optics in the paper; Reduced the opacity of paper, promptly along with the rising of beating degree, it becomes the paper opacity to descend.
For most of chemical pulps, long-pending place has increased light scattering coefficient at the specific fiber surface that increases, but has increased the bonded area of fiber simultaneously, has increased interfibrous optics contact and has caused light scattering coefficient to reduce again, finally causes translucence to reduce.Certainly tensile index can corresponding rising.As far as mechanical pulp, also increase though specific fiber surface is long-pending, the diameter of fiber, wall thickness reduce; Fines content is too many; Light scattering coefficient increases thereupon, and opacity and tensile index are all high as a result, but fines content is many; Make page surface after drying produce villous material again easily, cause and print hair.
Paper mill, Yaan, Sichuan is in the article of delivering " the use mixed fillers improves a paper opacity " literary composition; Change through filler increases the typographic printing paper that bamboo pulp is manufactured paper with pulp, and adds to fill out with paraffin rosin mixing application, calcium carbonate, talcum powder typographic printing paper opacity index is risen.
" Heilungkiang papermaking " 2007 the 1st phase names are called in " improving putting into practice of index such as low quantitative offset printing newsprint opacity " literary composition, and the newsprint of manufacturing paper with pulp with 70%TMP, 30% chemical pulp and DIP mixed pulp is through the beating degree of raising TMP pulping; Can increase the sophistication of fiber, increase fibrous binding force, indexs such as the opacity of paper, smoothness are improved; But the raising of beating degree makes energy consumption raise; Wet end dehydration difficulty, the speed of a motor vehicle descends to some extent, becomes the tearability of paper also to reduce.
Patent application 200410023218.5 discloses a kind of light-duty printing paper; The slurry of this paper is italian poplar alkaline hydrogen peroxide thermomechanical pulp APMP slurry, CTMP slurry and deinking slurry DIP; The ratio of its slurry is 70-30:20-50:20-0, also adds auxiliary material in addition, and the opacity of resultant paper is greater than 82%; The adding auxiliary material helps to improve the opacity of paper; But under the situation that adds auxiliary material, the opacity of paper is only greater than 82%, and promptly the opacity of this mixed pulp is lower.
Patent application 200510013212.4 discloses a kind of durability archival paper; It is characterized in that; By the cotton pulp of 5%-20% and 80%-95% float chemical wood pulp entirely and auxiliary material is formed, the opacity of resultant paper is greater than 90%, the described chemical wood pulp that floats entirely is softwood pulp, hardwood pulp.Though its paper is opaque relatively good, used wood pulp all is to bleach with hydrogen peroxide, because the selectivity that oxygen floats is high; Fiber is had certain damage, and because the wood grows cycle is long, the wood pulp source is more in short supply; Cost strengthens greatly, limits its use.
In sum, in order to improve the opacity of paper, the kind through fiber in the adjustment slurry, preparation technology, add factor such as auxiliary material in addition in the prior art; In the selecting for use of slurry, the slurry of the bleaching of use or the wood pulp of prepared by other are because the price of wood pulp is high; Improved copying of paper and processed this, in preparation technology, improved its opacity through the adjustment beating process; Increased the responsible property of technology, though add auxiliary material the opacity of paper has been played positive effect, the while maybe be also has a negative impact to other performances of paper; Also increased cost of material; The content complicacy also possibly be adverse effects such as its degree of aging quickening in the paper, so preferably improve from selecting for use of initial slurry, can better address the above problem.
Current, along with the pay attention to day by day to energy savings, paper has become the trend in epoch to the lightweight development; And have characteristics such as color and luster soft naturally (ecru), paper paper bulky; Opacity is high, and such paper is read easily, third dimension is strong, can reduce the fatigue of eyes.Usually when paper quantitatively descends, become the paper opacity also to descend, the opacity that how to improve paper is the problem that the present invention mainly solves.
Summary of the invention
An object of the present invention is to provide a kind of mixed pulp of high opacity; Used in this mixed pulp that a kind of cost is low, the simple slurry of pulping process; Its opacity is high, it is manufactured paper with pulp into paper product after, the opacity of paper product is high; Characteristics such as soft, simple nature of color and manufacturing technique are simple, and manufacturing cost is lower.
Another object of the present invention provides the paper that a kind of above-mentioned mixed pulp is manufactured paper with pulp.
A further object of the present invention provides a kind of paper, and the opacity of resulting paper product improves, and the color of its paper product is softer, and is little to the visual stimulus of human body, and other performances all meet instructions for use.
Be the technical scheme that realizes above-mentioned purpose, simply explain the present invention being adopted.
A kind of high opacity mixed pulp contains high opacity straw pulp in this mixed pulp.
Described high opacity straw pulp weight is the 20-98% of mixed pulp weight; The high opacity straw pulp of its preferred 60-95%; The more preferably high opacity straw pulp of 75-92%.
One or more the combination in any that contains wood pulp, cotton pulp, bamboo pulp or secondary stock in the described mixed pulp.
The opacity of described high opacity straw pulp is 89-99%, preferred 91-97%, more preferably 91.5-94%.
A kind of cultural paper comprises paper pulp and papermaking auxiliary material, it is characterized in that, described paper pulp comprise weight ratio be 20-98% do not float straw pulp and weight ratio is other slurries of 2-80%; Its preferred weight ratio 60-95% does not float straw pulp, and weight ratio is other slurries of 5-40%; More preferably weight ratio be 75-92% do not float straw pulp and weight ratio is other slurries of 8-25%; Described other slurries comprise one or more combination in any of wood pulp, bamboo pulp, cotton pulp or secondary stock, and the said straw pulp whiteness 30～60% of not floating is preferably 35～55%, more preferably 38～50%, most preferably be 40～45%.
Described opacity of not floating straw pulp is 89-99%, preferred 91-97%, more preferably 91.5-94%.
The whiteness of described cultural paper is 45-70%, and its preferred whiteness is 50-65%
Described cultural paper dirt count is less than 80 (0.3-1.5mm
2) individual m
-2Its preferred dirt count is less than 60 (0.3-1.5mm
2) individual m
-2
The opacity of described cultural paper is greater than 90%; Described fracture length is greater than 2.3km, and its preferred fracture length is greater than 2.8km.
Described cultural paper comprises copy paper printing paper, writing paper, typing paper, offset printing paper and newsprint.
Down in the face of technical scheme further explain of the present invention.
For first goal of the invention of real the present invention provides a kind of mixed pulp of high opacity, contain the high opacity straw pulp of weight ratio 15-100% in this mixed pulp.
The present invention mixes high opacity straw pulp in wood pulp or bamboo pulp etc. after, the opacity of its mixed pulp is all than the height that mixes bleaching straw pulp.The light scattering ability of the slurry of paper grade (stock) depends on the light scattering ability that occurs in fiber-air interface, briefly, with the character of fiber itself (as lignin content specific area, wall thickness) relevant with the tightness of paper.The whiteness of slurry is also influential to its opacity in addition.
The bulk of described high opacity straw pulp is 1.98～2.30dm
3/ g, its preferred 2.3-2.8dm
3/ g, more preferably 2.4-2.6dm
3/ g.
The opacity of described high opacity straw pulp is 89-99%, preferred 91-97%, more preferably 91.5-94%.
The principal element that influences opacity has tightness or content of lignin between the fiber etc.Wherein the influence to tightness is caused by multiple factor again, and along with the reduction of fibre length, the tightness of formed page improves.Similar paper tightness descends with the increase of fibre coarseness, and when becoming page, interfibrous area and the adhesion of interweaving is relative also more little; Thereby make the tightness of paper also more little; The paper bulky of producing, porous and coarse, the non-binding area of paper optics is big so, and the opacity of paper is just high more.
In slurries such as wood pulp or bamboo pulp, add high opacity straw pulp in the present invention; For prior art added bleaching straw pulp, high opacity straw pulp fiber was thicker than bleaching straw pulp, and the bulk of mixed slurry is high; The non-binding area of optics is bigger, so its opacity is also high.And for bleaching straw pulp, its rugosity is thinner, so tightness is high after causing its slurry to become paper, the non-binding area of optics is less, and the opacity of paper just descends.
Described high opacity straw pulp only passes through oxygen delignification after bleaching process or boiling; So it is more that the lignin of high opacity straw pulp is compared in the bleaching straw pulp; Lignin in the slurry is compared with cellulose; The index of refraction of lignin is higher, and light absorbing ability is also stronger, so big many of the paper opacity that adds paper that the mixed pulp of high opacity straw pulp fries and copy than the mixed pulp after adding bleaching straw pulp.Experimental example 1 is along with the adding mixed slurry tightness of straw pulp and the situation of change of opacity.
At " paper science with technology ", 2006 the 25th volume the 5th phase names are called in " whiteness of newsprint, colourity and opacity " and show, opacity be individual sample lining with on the black liner of " hypersorption " to green glow (wavelength 550nm) albedo (R
0) the corresponding albedo (R of individual sample of hassock (generally push away through paper and be laminated to certain thickness as mat) done with complete some samples of opacity
∞) ratio of (being whiteness).It is very big related that this has just determined that opacity and whiteness have.Opacity and the whiteness relation of being inversely proportional to, rule of thumb, when with same raw material proportionaling collecting newsprint, the every raising 2% of whiteness, opacity reduces by 1% approximately.In mixed slurry of the present invention, mixed high opacity straw pulp, the whiteness of high opacity straw pulp is at 30-60%, and for prior art added the higher straw pulp of whiteness, the whiteness of mixed pulp was all on the low side, so the opacity of mixed pulp is also higher.
In slurries such as wood pulp or bamboo pulp, add a certain amount of bleaching straw pulp; Because the fiber of bleaching straw pulp obviously attenuates, the slight brooming of fiber surface, its opacity is lower; Opacity is between 83-86%; Be incorporated in the mixed pulp its tightness and improve significantly, in addition because the whiteness of bleaching straw pulp is high, so corresponding opacity reduces.
It is 3.5-6.0mNm that the present invention mixes tear index
2Behind the high opacity straw pulp of/g, the tear index of its mixed pulp increases than the bleaching straw pulp that mixes of prior art.
Talk about influencing in the big or small argumentation of tearability at " Jiangsu papermaking " document of the 4th phase in 2006 " new knowledge of tearability and tearability mechanism ", when fiber bonding was higher, tearability descended to the degree of dependence of fibre length.Along with the increase of fibre strength, the logarithm of tear index is linear increase to the logarithm of fibre strength.Fibre coarseness is to the influence of tearability; People find that very early crude fibre produces higher tearability than fine fibre, Seth and Page with evidence the relation of fibre coarseness and tearability, if rejecting fiber self intensity is to the influence of page tearability; The rugosity of fiber increases, and tearability increases.
The present invention adds a certain amount of high opacity straw pulp and processes mixed slurry in slurries such as wood pulp or bamboo pulp; Because the fiber of high opacity straw pulp is thinner for wood pulp, these fine fibres well are filled into the gap between long fiber, make that the tightness between the fiber improves; Be that combination degree between the fiber is higher; Tearability descends to the length dependent of fiber, and is even the fiber of straw pulp is shorter, also very little to its influence.Mix a certain amount of high opacity straw pulp in the above-mentioned mixed slurry and processed mixed slurry; For prior art added bleaching straw pulp, the intensity of fiber was big, and relatively thicker; According to the influence of fibre strength and rugosity to tearability; Add high opacity straw pulp, the tearability that its tearability adds bleaching straw pulp is big, because tear index is the quantitative tearability of unit; So for adding bleaching straw pulp in the slurries such as wood pulp or bamboo pulp, the tear index of mixed pulp that adds high opacity straw pulp gained is bigger with respect to prior art.
High opacity straw pulp air permeability of the present invention can reach 2600～6000ml/min, is preferably 3500～5500ml/min, more preferably 4600～5200ml/min.
Be used to copy paper after the high opacity straw pulp of this high-air-permeability mixed with other slurries, can in the process of manufacturing paper with pulp, use the higher speed of a motor vehicle, improved production efficiency greatly.Perhaps can more massive use papermaking straw pulp in certain vehicle speed range, can be reduced to minimum to the consumption of timber.Why this slurry that has than high-air-permeability can improve the speed of a motor vehicle, possibly be because its water filtyration velocity when copying paper is fast, can shorten its time of staying on the paper machine, so the paper motor speeds is able to promote significantly even car scooter 1000m/min.Because water is more prone to filter, drying process thereafter can further shorten heat time heating time, reduces heating-up temperature, makes production cost reduce greatly.
High opacity straw pulp of the present invention comprises the one or more kinds of combination in any of rice straw pulp, Straw Pulp, reed pulp, giantreed slurry, Chinese alpine rush slurry, cotton stem pulp or bagasse pulp.
Described high opacity straw pulp comprises chemical method, Mechanical Method or/and the slurry of chemical mechanical pulping preparation, the slurry of its preferred chemical method preparation.
Described high opacity straw pulp is to comprise the slurry that behind boiling, washing step, obtains, the slurry that perhaps obtains through boiling, washing, oxygen delignification step.
Described high opacity straw pulp is to comprise the slurry that behind boiling, washing step, obtains, the slurry that perhaps obtains through boiling, washing, oxygen delignification step.
Described boiling comprises Ammonium Sulfite Method, soda processes, caustic soda-anthraquinone, sulfate process or alkaline sodium sulfite-anthraquinone.
High opacity straw pulp according to the invention is starched or is not floated straw pulp and can prepare according to following method:
1, Ammonium Sulfite Method:
1. in the dogstail raw material of removing impurity, add steaming preparation, wherein the consumption of ammonium sulfite is an over dry material quantity 9-20%, joins the 0-15% that amount of sodium hydroxide is the over dry material quantity, and liquor ratio is 1:2-9;
2. feed Steam Heating, heating-up temperature is 120-250 ℃, and be 100-250 minute heat time heating time, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Wherein can be preferably:
1. 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, joins the 0-8% that amount of sodium hydroxide is the over dry material quantity, and liquor ratio is 1:2-4;
2. heat temperature raising is to temperature 165-173 ℃, omnidistance time 160-210 minute of boiling, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Obtaining the high-air-permeability slurry or not floating the straw pulp permanganate number is 16～28, preferred 16～25.
2, soda processes:
Alkali number 6～14, liquor ratio 1:8～1:2, idle running 20～60min, pressure 400～550kPa, temperature 110～180, digestion time 90～140min, the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
3, caustic soda-anthraquinone method:
1. in the grass kind plant raw material, add cooking liquor, wherein alkali charge in NaOH to over dry material quantity 9-20%, liquor ratio is 1:2-10, the anthraquinone addition is the 0.5-2.0 ‰ of over dry material quantity;
2. heat temperature raising is to temperature 120-200 ℃, omnidistance time 100-250 minute of boiling, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Wherein can be preferably:
1. in the grass kind plant raw material, add cooking liquor, wherein alkali charge in NaOH to over dry material quantity 7-15%, liquor ratio is 1:2-4, the anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity;
2. heat temperature raising is to temperature 160-165 ℃, omnidistance time 140-190 minute of boiling.
Obtaining the high-air-permeability slurry or not floating the straw pulp permanganate number is 16～28, preferred 16～25.
4, sulfate process
1. in the grass kind plant raw material, add cooking liquor, wherein alkali charge be the NaOH meter to over dry material quantity 5-15%, liquor ratio is 1:2-10, sulphidity is 3-15%;
2. heat temperature raising is to temperature 150-200 ℃, omnidistance time 100-250 minute of boiling, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Wherein can be preferably:
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 1:2-4, sulphidity is 5-8%;
2. heat temperature raising is to temperature 165-173 ℃, omnidistance time 150-200 minute of boiling, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Obtaining the high-air-permeability slurry or not floating the straw pulp permanganate number is 16～28, preferred 16～25.
5, alkaline sodium sulfite-anthraquinone boiling comprises:
(1) in the dogstail raw material, add cooking liquor, wherein, sodium hydroxide concentration counts 9-15% with the over dry raw material weight, and sodium sulfite is 2-30%, and anthraquinone is 0.03-0.08%, and cooking liquor is than being 1:2.5-1:6;
(2) heat temperature raising is to temperature 150-180 ℃, omnidistance time 95-190 minute of intensification, little venting, insulation, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Method for optimizing comprises:
(1) in the dogstail raw material, add cooking liquor, wherein, sodium hydroxide concentration counts 9-15% with the over dry raw material weight, and sodium sulfite is 2-6%, and anthraquinone is 0.4-0.08%, and cooking liquor is than being 1:3-4;
Heat temperature raising is to temperature 160-165 ℃, omnidistance time 140-190 minute of intensification, little venting, insulation, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Obtaining the high-air-permeability slurry or not floating the straw pulp permanganate number is 16～28, preferred 16～25.
Above-mentioned high-air-permeability straw pulp or do not float straw pulp also can be according to the preparation of following method:
1, Ammonium Sulfite Method:
The grass raw material is added in the pot, add cooking liquor again, cooking liquor is warming up to 100-200 ℃; Boost to 0.3-0.9MPa, digestion time is 150-250 minute, in the described steaming preparation; Wherein the ammonium sulfite consumption is the 5-20% to the over dry material quantity; Join the 0-15% that amount of sodium hydroxide is the over dry material quantity, liquor ratio is 1:2-15, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Wherein can be preferably:
The grass raw material is added in the pot, add cooking liquor again, cooking liquor is warming up to 156-173 ℃; Boost to 0.6-0.75MPa, digestion time is 180-220 minute, in the described steaming preparation; Wherein the ammonium sulfite consumption is the 9-15% to the over dry material quantity; Join the 0-8% that amount of sodium hydroxide is the over dry material quantity, liquor ratio is 1:6-10, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Obtaining the high-air-permeability slurry or not floating the straw pulp permanganate number is 16～28, preferred 16～25.
2, caustic soda-anthraquinone method:
The grass kind plant raw material is gone in the digester, after the dress pot is full, close pot cover, boiling temperature is 100-200 ℃; Boost to 0.3-0.9MPa simultaneously, digestion time is 150-250 minute, in the described steaming preparation; Alkali charge is to over dry material quantity 5-20% in NaOH; Liquor ratio is 1:2-15, and the anthraquinone addition is the 0.2-1.5 ‰ of over dry material quantity, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Wherein can be preferably:
The grass kind plant raw material is gone in the digester, after the dress pot is full, close pot cover, boiling temperature is 147-165 ℃; Boost to 0.4-0.6MPa simultaneously, digestion time is 160-220 minute, in the described steaming preparation; Alkali charge is to over dry material quantity 9-17% in NaOH; Liquor ratio is 1:6-9, and the anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Obtaining the high-air-permeability slurry or not floating the straw pulp permanganate number is 16～28, preferred 16～25.
3, kraft cooking is:
The grass kind plant raw material is gone in the digester, after the dress pot is full, close pot cover, boiling temperature is 100-200 ℃; Boost to 0.3-0.9MPa simultaneously; Digestion time is 150-280 minute, and in the described steaming preparation, alkali charge is that the NaOH meter is to over dry material quantity 5-20%; Liquor ratio is 1:5-15, and sulphidity is 3-15%.
Wherein can be preferably:
The grass kind plant raw material is gone in the digester, after the dress pot is full, close pot cover, boiling temperature is 155-168 ℃; Boost to 0.5-0.65MPa simultaneously; Digestion time is 200-250 minute, and in the described steaming preparation, alkali charge is that the NaOH meter is to over dry material quantity 8-13%; Liquor ratio is 1:6-10, and sulphidity is 5-9%.
Obtaining the high-air-permeability slurry or not floating the straw pulp permanganate number is 16～28, preferred 16～25.
4, alkaline sodium sulfite-anthraquinone boiling comprises:
The grass raw material is added in the pot, add cooking liquor again, cooking liquor is warming up to 80-250 ℃; Boost to 0.3-0.8MPa, heat up, be incubated and be replaced into 110-300 minute, in the described steaming preparation; Wherein the consumption of NaOH is counted 9-17% with the over dry raw material weight; The consumption of sodium sulfite is the 4-30% of over dry raw material weight, and the consumption of anthraquinone is the 0.03-0.08% of over dry raw material weight, and liquor ratio is 1:2.5-10; It preferably adds the grass raw material in the pot, adds cooking liquor again, and cooking liquor is warming up to 100-200 ℃; Boost to 0.4-0.65MPa; Heat up, be incubated and be replaced into 150-250 minute, in the described steaming preparation, wherein the consumption of NaOH is counted 9-17% with the over dry raw material weight; The consumption of sodium sulfite is the 4-8% of over dry raw material weight; The consumption of anthraquinone is the 0.04-0.08% of over dry raw material weight, and liquor ratio is 1:6-10, and the slurry that obtains is not floated straw pulp or high opacity straw pulp after shove, washing.
Above-mentioned preparation method can also further carry out oxygen delignification, and described oxygen delignification is used the prior art disclosed method.
Described oxygen delignification comprises: the slurry of gained after the boiling or the slurry after the washing are sent in the oxygen delignification reaction tower, and said slurry is 90-100 ℃ in the temperature of reaction tower import department, and pressure is 0.9-1.2MPa; The temperature in exit is 95-105 ℃, and pressure is 0.2-0.6MPa; For in the 2-4% of NaOH to the oven dry stock amount, the addition of oxygen is to carry out 60-90 minutes under the condition of slurry 20-40kg per ton to described oxygen delignification, is not floated straw pulp at alkali charge.
High opacity straw pulp is without bleaching process; When having avoided bleaching with chlorine bleaches; The chlorine element mainly is converted into AOX, and main component is chloroform, chloro phenol compound, many chloros dioxin and furans, and these materials all have toxicity; Especially many chloros dioxin and furans have carcinogenic strongly, cause a disease change, teratogenesis shape and multiple cranial nerve pathology; And in bleached pulp, also have residual dioxin,, simultaneously environment is polluted so the paper that the slurry of crossing with chlorine bleach makes is extremely unfavorable to human body; Because many unfavorable factors that chlorine floats are advocated at present and used chlorine-free bleaching agent bleached pulp, but need be to Extended Delignification before floating, digesting technoloy requires high; In bleaching process, lignin is oxidized to quinhydrones, and this quinhydrones is oxidized to quinone easily; The one of the main reasons of brightness reversion just takes place, in addition, because half fiber content of straw pulp is than higher; And the half fiber degree of polymerization low, contain more side chain, receive oxidation easily, cause containing in the paper pulp carboxyl and carbonyl; Easy its brightness reversion, so the straw pulp of chlorine-free bleaching prepares book paper, operational sequence is complicated, cost is high and easy brightness reversion.
The degree of aging of the whiteness of described high opacity straw pulp is low than the bleaching straw pulp degree of aging, and the paper product that promptly is worth by the high opacity straw pulp gained mixed pulp of mixing is not easy brightness reversion.The degradation of the whiteness of high opacity straw pulp is auspicious sees comparative example 3.
Mixed pulp of the present invention adopts the disclosed pulping method of prior art to copy into paper product.
A kind of cultural paper that utilizes above-mentioned mixed pulp to manufacture paper with pulp comprises paper pulp and papermaking auxiliary material, and described paper pulp comprises that weight ratio is the high opacity straw pulp of 20-98% and other slurries that weight ratio is 2-80%; Its preferred weight ratio 60-95% does not float straw pulp, and weight ratio is other slurries of 5-40%; More preferably weight ratio is the high opacity straw pulp of 75-92% and other slurries that weight ratio is 8-25%.
Described other slurries comprise one or more combination in any of wood pulp, bamboo pulp, cotton pulp or secondary stock.
The opaque straw pulp whiteness 30～60% of said height is preferably 35～55%, and more preferably 38～50%, most preferably be 40～45%.
The opacity of the opaque straw pulp of described height is 89-99%, preferred 91-97%, more preferably 91.5-94%.
The whiteness of described cultural paper is 45-70%, and its preferred whiteness is 50-65%.
Described cultural paper dirt count is less than 80 (0.3-1.5mm
2) individual m
-2Its preferred dirt count is less than 60 (0.3-1.5mm
2) individual m
-2
The opacity of described cultural paper is greater than 90%; Described fracture length is greater than 2.3km, and its preferred fracture length is greater than 2.8km.
Described cultural paper comprises copy paper printing paper, writing paper, typing paper, offset printing paper and newsprint.
The present invention provides a kind of cultural paper, comprises paper pulp and papermaking auxiliary material, and described paper pulp comprises that weight ratio is the high opacity straw pulp of 20-98% and other slurries that weight ratio is 2-80%; Its preferred weight ratio 60-95% does not float straw pulp, and weight ratio is other slurries of 5-40%; More preferably weight ratio is the high opacity straw pulp of 75-92% and other slurries that weight ratio is 8-25%.
Described other slurries comprise one or more combination in any of wood pulp, bamboo pulp, cotton pulp or secondary stock, and the opaque straw pulp whiteness 30～60% of said height is preferably 35～55%, more preferably 38～50%, most preferably be 40～45%.
The straw pulp that do not float of the present invention comprises the slurry that behind boiling, washing step, obtains, the slurry that perhaps obtains through boiling, washing, oxygen delignification step,
The preferred above-mentioned high opacity straw pulp of straw pulp that do not float of the present invention.
Described opacity of not floating straw pulp is 89-99%, preferred 91-97%, more preferably 91.5-94%.
The described tear index that does not float straw pulp is 3.5-6.0mNm
2/ g, preferred 4.6-5.6mNm
2/ g, more preferably 4.8-5.4mNm
2/ g.
Described bulk of not floating straw pulp is 1.98～2.30dm
3/ g, its preferred 2.3-2.8dm
3/ g, more preferably 2.4-2.6dm
3/ g.
Described cultural paper comprises that weight ratio is the straw pulp of 15-90% and other slurries that weight ratio is 10-85%; Its preferred weight ratio 35%-70% does not float straw pulp, and weight ratio is other slurries of 30-65%.
The whiteness of described cultural paper is 45-70%, and dirt count is less than 80 (0.3-1.5mm
2) individual m
-2Its preferred whiteness is 50-65%, and preferred dirt count is less than 60 (0.3-1.5mm
2) individual m
-2
The opacity of described cultural paper is greater than 90%; Described fracture length is greater than 2.3km, and its preferred fracture length is greater than 2.8km.
Described cultural paper comprises copy paper printing paper, writing paper, typing paper, offset printing paper and newsprint.
The fracture length of described cultural paper is greater than 2.3km, and its preferred fracture length is greater than 2.8km.
Cultural paper requires that certain opacity is arranged, and write on the two sides that is beneficial to paper, shadow-mark, print through phenomenon can not occur.The opacity height that does not float straw pulp itself of the present invention makes and contains the opaque height that the mixed pulp of not floating straw pulp is copied the system paper that reach more than 90%, it is preferred more than 92%.
Whiteness is a very important index of cultural paper, and past people is pursued high whiteness paper always, makes to look very clean; In paper-making process with used association with pulp bleaching and then manufacture paper with pulp into paper, but research shows that high whiteness is bigger to people's visual stimulus, in bleaching process, can produce harmful material simultaneously; The present invention proposes not float straw pulp at paper pulp and copies the system paper, and its whiteness is at 45-70%, and preferred whiteness is 50-65%; Very little to human visual in this scope; And add in the paper pulp and do not float straw pulp, the nuisance quality has reduced, and has reduced the slurrying cost.
The present invention does not float straw pulp and has not merely reduced paper of whiteness with adding, owing to do not float self performance of straw pulp, makes the combination property that contains the paper that does not float straw pulp all near national standard or be up to state standards above through adding suitable auxiliary material simultaneously.
The dirt count of cultural paper is less than 80 (0.3-1.5mm
2) individual m
-2Preferred dirt count is less than 60 (0.3-1.5mm
2) individual m
-2
For cultural paper, especially the tensile strength of newsprint influences printing efficiency because when printing page to drag paper roll and rotate, high tensile strength can guarantee that paper web is not broken.So the tear index height of slurry is necessary also to the printing of newsprint that also the fracture length of said newsprint is greater than 3.1km, its preferred fracture length is greater than 3.3km.
The smoothness of said cultural paper (s) is greater than 30, and its preferred smoothness (s) is greater than 40, and more preferably smoothness (s) is greater than 50.
Outstanding advantage of the present invention is:
1) in mixed pulp, mixed and do not floated straw pulp, reduced the consumption of wood pulp etc., reduced the cost of producing paper greatly.
2) do not float straw pulp and do not pass through bleaching process, avoided in bleaching process because bleaching agent pollution on the environment and produce harmful material is copied the paper product of processing and also contained harmful material hardly, perhaps content is few; Simultaneously since without cross the bleaching process straw pulp directly with the paper of manufacturing paper with pulp after other slurries mix, saved operation, practiced thrift the papermaking time.
3) an amount of straw pulp that do not float that in mixed pulp, mixes because the particular characteristic of brown stock, has improved the opacity of mixed slurry; Make that mixed slurry is that the consumption of required slurry reduces at the paper of the equal rank opacity of preparation; Reduced paper cost, the light weight of while paper is when the opacity height; Can only be through a large amount of reverberation on the paper front, feel color and luster and Printing Marks, image on the paper front; Because of not receiving or receive denier from the reverberation on the back side of paper; Thereby can't see Printing Marks and image on the back side of paper or on the bed course; Otherwise when paper is opaque when low, the reverberation that just has on the back side of paper gets into people's eyes; At this moment, the shadow-mark phenomenon just appears in paper.
4) copy the cultural paper of processing open in owing to contain and do not float straw pulp, its paper of whiteness is very little to people's visual stimulus, is fit to very much read, and is especially highly beneficial concerning the very big students in middle and primary schools of amount of reading.The degree of aging of its paper whiteness reduces greatly, is not easy brightness reversion.
The specific embodiment
Below be the specific embodiment of the present invention, described embodiment is in order to further describe the present invention, rather than restriction the present invention.
One, do not float the preparation of straw pulp
1, embodiment 1-8 does not float the embodiment of straw pulp for adopting the sulfate process preparation.The performance of wherein not floating straw pulp is that the slurry that after boiling, washing, obtains adopts conventional method to record.
Table 1, sulfate process
2, embodiment 9-15 does not float the embodiment of straw pulp for adopting the soda processes preparation.The performance of wherein not floating straw pulp is that the slurry that after boiling, washing, obtains adopts conventional method to record.
Table 2, soda processes
The cm of bulk unit in the form
3/ g, air permeability unit/ml/min, fracture length unit K m, the N.m/g of folding strength unit, the mN of tearability unit, the mN.m of tear index unit
2/ g.Following table is identical.
3, embodiment 16-22 does not float the embodiment of straw pulp for adopting the caustic soda-aq method preparation.The performance of wherein not floating straw pulp is that the slurry that after boiling, washing, obtains adopts conventional method to record.
Table 3, caustic soda-aq method
4, embodiment 23-28 does not float the embodiment of straw pulp for adopting alkaline sodium sulfite-AQ method preparation.The performance of wherein not floating straw pulp is that the slurry that after boiling, washing, obtains adopts conventional method to record.
Table 4, alkaline sodium sulfite-AQ method
5, embodiment 29～34 is for adopting pulping with ammonium sulfite method
Table 5, pulping with ammonium sulfite method parameter
Can find out that by the front form employing can with high-air-permeability slurry or not float the boiling of straw pulp hardness be 16～28 to permanganate number, the straw pulp that the Ammonium Sulfite Method in preferred 16～25 scopes prepares, performance than additive method obtain higher.
6, adopt the preparation of different pulping process and oxygen delignification not float straw pulp
The resulting slurry of the foregoing description is carried out not floated straw pulp behind the oxygen delignification again.
Table 6, the different prepared slurries of slurrying embodiment carry out the performance of not floating straw pulp that obtains behind the oxygen delignification
Two, the preparation of paper products
1, electro-photographic paper
The preparation method of electro-photographic paper is referring to " production technology of electro-photographic paper " (" production technology of electro-photographic paper " of Yan Jianhua, Wang Cuilian, Zhang Jiyan; " paper and papermaking "; The 3rd phase of July in 1993: 23-24), different just raw materials be mixed pulp proportioning is different.The performance parameter of the electro-photographic paper that different mixed pulp preparations is prepared is as shown in table 7:
Table 7, different mixed pulp are prepared the performance parameter of prepared electro-photographic paper
Annotate: 16# number slurry for embodiment 16 prepared do not float straw pulp, 6# number slurry for embodiment 6 prepared do not float straw pulp, by that analogy.
Can find out from table 7, adopt and not float the electro-photographic paper National standard that other paper pulp of straw pulp adapted is manufactured paper with pulp that some performance even be superior to national standard is as obviously increase to deflection in length and breadth.
2, newsprint
The preparation method of newsprint is referring to patent application CN93108185 manufacturing approach, different just raw materials be that the proportioning of mixed pulp is different.The performance parameter of the newsprint paper that different mixed pulp preparations is prepared is as shown in table 8:
Table 8, different mixed pulp are prepared the performance parameter of prepared newsprint
Annotate: 26# number slurry for embodiment 26 prepared do not float straw pulp, by that analogy.
Can find out from table 8, adopt and not float the newsprint that other paper pulp of straw pulp adapted is manufactured paper with pulp that because the performance of not floating straw pulp, it is very high to make it copy its opacity of newsprint, the smoothness processed, other index National standard.
3, typing paper
The preparation method of typing paper referring to " production of brief talking typing paper with put into practice " (" production of brief talking typing paper with put into practice " is encouraged by Liu Liyuan, kind unit, " Hunan papermaking ", the 2nd phase of calendar year 2001: 10-11), different just raw materials be that the proportioning of mixed pulp is different.The performance parameter of the electro-photographic paper that different mixed pulp preparations is prepared is as shown in table 9:
Table 9, different mixed pulp are prepared the performance parameter of prepared typing paper
Annotate: 23# number slurry for embodiment 23 prepared do not float straw pulp, by that analogy.
Can find out from table 9, adopt and not float typing paper that other paper pulp of straw pulp adapted manufactures paper with pulp except whiteness, other index National standard.
4, offset printing paper
Table 10, different mixed pulp are prepared the performance parameter of prepared hectographic printing with paper
Annotate: 25# number slurry for embodiment 25 prepared do not float straw pulp, by that analogy.
Can find out that from table 10 adopt and not float offset printing paper whiteness that other paper pulp of straw pulp adapted manufactures paper with pulp and human visual is stimulated little, opacity, smoothness improve other index National standard.
5, writing paper
The preparation method of writing paper copies the paper method referring to patent ZL87101416.5, different just raw materials be mixed pulp proportioning is different.The performance parameter of the writing paper that different mixed pulp preparations is prepared is as shown in table 11:
Table 11, different mixed pulp are prepared the performance parameter of prepared writing paper
Annotate: 26# number slurry for embodiment 26 prepared do not float straw pulp, by that analogy.
Can find out that from table 11 adopt and not float writing paper whiteness that other paper pulp of straw pulp adapted manufactures paper with pulp and human visual is stimulated little, opacity, smoothness improve other index National standard.
Below be adapted do not float the prepared paper product of straw pulp and adapted bleaching straw pulp performance relatively
Comparative example 1
Table 12 pair be equipped with 55% bleached wheat straw pulp (batching A) be equipped with 55% do not float the copy paper that Straw Pulp (batching B) produces quality contrast.Batching A and batching B manufacture paper with pulp under same paper machine, condition of similarity; Through relatively knowing; Be equipped with the closely similar of paper main performance that 55% bleached wheat straw pulp manufactures paper with pulp and whole wood pulp; Do not float paper main performance that Straw Pulp manufactures paper with pulp than the making moderate progress of whole wood pulp and be equipped with 55%, and performance is superior to being equipped with the paper that 55% bleached wheat straw pulp is manufactured paper with pulp.
Table 12. whole wood pulp copy paper be equipped with 55% bleached wheat straw pulp be equipped with 55% do not float Straw Pulp the copy paper performance relatively
| Performance | Batching A | Batching B |
| Tightness (kg/dm 3) | 652 | 580 |
| Bulk (dm 3/kg) | 0.0015 | 0.0017 |
| Air permeability (Ge Laifa) (s) | 31 | 36 |
| Deflection (vertically) (mNm) | 0.44 | 0.50 |
| Deflection (laterally) (mNm) | 0.19 | 0.23 |
| Opacity (%) | 92.0 | 95.0 |
| A proportioning: 30% bleached sulphate softwood pulp, 20% bleached sulphate eucalyptus pulp, 50% bleached sulphate Straw Pulp | The B proportioning: 30% bleached sulphate softwood pulp, 20% bleached sulphate eucalyptus pulp 50% does not float sulfate wheat straw pulp |
Comparative example 2
This comparative example is the comparison of the performance of not floating straw pulp and bleaching straw pulp of Shandong Qualin Paper Industry Co., Ltd.; Wherein, Do not float (pressure) and bleaching (pressure) and be meant what employing this area conventional method detected, not floating (pressing) and bleaching (pressure) is to adopt following method detection:
(1) page is manufactured paper with pulp
Closing water discharging valve, clip storage slurry device, open inlet valve with the flushing net, let waterborne being raised to be higher than wire side 50mm place at least, quantitatively is 60 ± 3.0g/m by what copy into page
2Amount pour slurry (calculating) into by oven-dry weight.
Add to water on the marker levels line, insert agitator, and move stirred suspension lightly up and down; Agitating plate should remain under the suspension liquid level when stirring; Move up and down for six times back and forth and can guarantee that slurry mixes with water fully completely, then before the taking-up agitator, more gently stirring once; Wait 10s quietly, promptly all open the emptying valve subsequently.
After water filtered from copper mesh, to online in type page, the suction time that reduces pressure was about about 10% of drainage time, but is no less than 5s, has obtained page.
(2) detect the performance of starching
Step (1) page of processing of copying is surveyed various performances according to following method respectively:
Quantitatively measure, can calculate bulk according to tightness according to GB 451 " paper and Board size, degree of skewness, quantitatively, the determination method of thickness and tightness ".
Tensile index is measured by GB 453 " determination method of paper and Board tensile strength and percentage elongation ".
Tear index is measured according to GB455 " assay method of paper and Board tearability ", obtains quantitatively can calculating tear index divided by the sample through warm and humid processing after the tearability.
Folding strength is measured by GB 457 " determination method of paper folding strength ".
Air permeability is measured by GB 5402 " determination method of paper and cardboard air permeability (Ge Erlaifa) ".
Whiteness is measured by GB/T 7974-2002 " the mensuration diffuse reflection/normal beam technique of paper, cardboard and brightness of pulp (whiteness) ".
Table 13, Shandong Qualin Paper Industry Co., Ltd.'s laboratory report (mean value)
| Test item | Unit | Brown stock (pressure) | Brown stock (not pressing) | Bleached pulp (pressure) | Bleached pulp (not pressing) |
| Quantitatively | g/m 2 | 58.0 | 58.2 | 62.0 | 61.7 |
| Bulk | cm 3/g | 2.33 | 2.57 | 1.84 | 1.91 |
| Whiteness | ％ | 39.3 | 41.1 | 67.0 | 69.3 |
| Form and aspect | L *a *b | 78.42/1.63/17.64 | 79.72/1.33/17.22 | 89.55/0.97/7.10 | 90.34/0.86/6.50 |
| Opacity | ％ | 93.2 | 95.0 | 83.9 | 87.2 |
| Air permeability | ml/min | 148 | 430 | 79 | 236 |
| Fracture length | Km | 5.48 | 4.76 | 5.64 | 5.14 |
| Tensile index | N.m/g | 53.6 | 46.7 | 55.3 | 50.4 |
| Folding strength | Inferior | 36 | 39 | 44 | 37 |
| Tearability | mN | 235 | 233 | 242 | 206 |
| Tear index | mN.m 2/g | 4.04 | 4.00 | 3.90 | 3.40 |
Comparative example 3
This Test Example be Shandong Qualin Paper Industry Co., Ltd. do not float straw pulp and bleaching straw pulp degradation comparing result.
14, Shandong Qualin Paper Industry Co., Ltd.'s laboratory report (mean value)
| Test item | Quantitatively | Bulk | Fracture length | Tensile index | Folding strength | Tear index | Tearability | Whiteness | Color (L*a*b) |
| Unit | g/m 2 | cm 3/g | Km | Km | Inferior | mN.m 2/g | mN | ％ | |
| 1# line (true qualities) | 64.7 | 2.104 | 4.711 | 46.2 | 84 | 2.93 | 189.6 | 38.5 | 78.55/14.81/16.77 |
| 1# line (true qualities are aging) | 63.3 | 2.113 | 4.751 | 46.5 | 6.5 | 2.95 | 187 | 37.8 | 78.32/11.56/19.13 |
| 3# line (true qualities) | 63.0 | 2.419 | 4.872 | 47.7 | 32.5 | 424 | 267.1 | 38.8 | 78.57/11.00/18.47 |
| 3# line (true qualities are aging) | 61.8 | 2.248 | 5.098 | 49.9 | 12 | 3.87 | 239 | 39.2 | 78.08/11.50/18.47 |
| 1# line (bleaching) | 61.1 | 2.012 | 4.553 | 44.6 | 17 | 3.71 | 226.7 | 66.1 | 88.97/9.46/7.67 |
| 1# line (bleaching is aging) | 60.8 | 1.974 | 4.381 | 42.93 | 5 | 3.03 | 184 | 62.2 | 88.12/10.15/10.56 |
| 3# line (bleaching) | 61.4 | 1.904 | 5.004 | 49 | 42 | 4.12 | 252.7 | 67.9 | 89.80/9.58/7.76 |
| 3# line (bleaching is aging) | 61.1 | 1.783 | 5.032 | 49.3 | 13.7 | 3.01 | 184 | 61.4 | 88.10/10.04/9.54 |
The result shows, compares with bleached pulp, and natural color pulp is difficult for brightness reversion, and ageing resistace is more superior.
Experimental example 1
This experimental example is the mixed slurry that does not float straw pulp and wood pulp composition, does not float the influence of the consumption of straw pulp to fiber tightness and opacity along with adding.
Table 15, to the experiment of the influence factor of opacity
| Do not float straw pulp consumption (%) | Whiteness | Tightness (g/cm 3) | Opacity (%) |
| 20％ | 62％ | 0.60 | 92.0 |
| 40％ | 53％ | 0.62 | 92.4 |
| 60％ | 48％ | 0.62 | 94.9 |
| 85％ | 42％ | 0.66 | 95.4 |
Can find out that from table 15 adding weight is the straw pulp that do not float of 20-85%, its opacity improves a lot.
Claims (22)
1. one kind high opacity mixed pulp is characterized in that, contains high opacity straw pulp in this mixed pulp, and the opacity of described high opacity straw pulp is 89-99%,
Said high opacity straw pulp prepares according to following method:
In the raw material of removing impurity, add steaming preparation, boiling temperature 156-173 ℃, cooking pressure 0.6-0.75MPa; Digestion time is 180-220 minute, and in the described steaming preparation, wherein the ammonium sulfite consumption is the 9-15% to the over dry material quantity; Join the 0-8% that amount of sodium hydroxide is the over dry material quantity; Liquor ratio is 1: 6-10, and the slurry that obtains after the boiling obtains high opacity straw pulp or does not float straw pulp through shove, washing, and its permanganate number is 16～28.
2. mixed pulp according to claim 1 is characterized in that, the opacity of described high opacity straw pulp is 91-97%.
3. mixed pulp according to claim 1 is characterized in that, the opacity of described high opacity straw pulp is 91.5-94%.
4. mixed pulp according to claim 1 is characterized in that, described high opacity straw pulp weight is the 20-98% of mixed pulp weight.
5. mixed pulp according to claim 4 is characterized in that, described high opacity straw pulp weight is the 60-95% of mixed pulp weight.
6. mixed pulp according to claim 5 is characterized in that, described high opacity straw pulp weight is the 75-92% of mixed pulp weight.
7. mixed pulp according to claim 1 is characterized in that, the permanganate number of described high opacity straw pulp is 16～25.
8. a cultural paper comprises paper pulp and papermaking auxiliary material, it is characterized in that, described paper pulp comprise weight ratio be 20-98% do not float straw pulp and weight ratio is other slurries of 2-80%; Described other slurries comprise one or more combination in any of wood pulp, bamboo pulp, cotton pulp or secondary stock, the said straw pulp whiteness 30～60% of not floating, and opacity is 89-99%, described cultural paper dirt count is less than 80 (0.3-1.5mm
2) individual m
-2, the fracture length of said cultural paper is greater than 2.3km.
9. cultural paper according to claim 8 is characterized in that, described opacity of not floating straw pulp is 91-97%.
10. cultural paper according to claim 9 is characterized in that, described opacity of not floating straw pulp is 91.5-94%.
11. cultural paper according to claim 8 is characterized in that, the whiteness of described cultural paper is 40-70%.
12. cultural paper according to claim 11 is characterized in that, the whiteness of described cultural paper is 40-60%.
13. cultural paper according to claim 8 is characterized in that, described cultural paper dirt count is less than 60 (0.3-1.5mm
2) individual m
-2
14. cultural paper according to claim 8 is characterized in that, the opacity of described cultural paper is greater than 90%.
15. cultural paper according to claim 8 is characterized in that, the fracture length of described cultural paper is greater than 2.8km.
16. cultural paper according to claim 8 is characterized in that, described paper pulp comprise weight ratio be 60-95% do not float straw pulp and weight ratio is other slurries of 5-40%.
17. cultural paper according to claim 16 is characterized in that, described paper pulp comprise weight ratio be 75-92% do not float straw pulp and weight ratio is other slurries of 8-25%.
18. cultural paper according to claim 8 is characterized in that, the described straw pulp whiteness of not floating is 35～55%.
19. cultural paper according to claim 18 is characterized in that, the described straw pulp whiteness of not floating is 38～50%.
20. cultural paper according to claim 19 is characterized in that, the described straw pulp whiteness of not floating is 40～45%.
21. each described cultural paper is characterized in that according to Claim 8-20, described cultural paper comprises copy paper, printing paper, writing paper, typing paper and newsprint.
22. cultural paper according to claim 21 is characterized in that, described printing paper is an offset printing paper.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165888A (en) * | 1997-01-10 | 1997-11-26 | 德州沪平永发造纸有限公司 | Straw pulp for producing offset printing paper by sulammonium process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165888A (en) * | 1997-01-10 | 1997-11-26 | 德州沪平永发造纸有限公司 | Straw pulp for producing offset printing paper by sulammonium process |
Non-Patent Citations (1)
| Title |
|---|
| 林治宪等."纸的不透明度及提高途径的研究成果".《天津造纸》.1997,(第1期),第2-8页. |
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