CN101760982B - Mixed pulp with high bulk and paper having same - Google Patents
Mixed pulp with high bulk and paper having same Download PDFInfo
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- CN101760982B CN101760982B CN200810173094.7A CN200810173094A CN101760982B CN 101760982 B CN101760982 B CN 101760982B CN 200810173094 A CN200810173094 A CN 200810173094A CN 101760982 B CN101760982 B CN 101760982B
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Abstract
The invention relates to mixed pulp with high bulk and paper or paper molded products having the same, which are characterized in that the mixed pulp comprises bulky straw pulp of which the bulk is 2-3cm<3>/g, preferably 2.3-2.8cm<3>/g, more preferably 2.4-2.6cm<3>/g. The bulky straw pulp or unbleached straw pulp provided by the invention has high bulk, so that the paper prepared by the bulky straw pulp or the unbleached straw pulp prepared by the method of the invention has high bulk and non-transparency; the increased bulk improves the stiffness of the paper or the paper molded products so as to avoid the phenomena, such as paper blocking and the like, and the improved non-transparency can prevent the print through of the paper.
Description
Technical field
The invention belongs to paper pulp papermaking technology, particularly a kind of have the mixing slurry of high bulk and contain the paper that this mixing is starched.
Background technology
Paper producer and user more and more pay close attention to the bulk of paper in recent years.The bulk of paper has determined opacity and the deflection of paper to a great extent.Modern duplicator and printer require paper to have higher deflection or thickness so that paper can be smoothly through these photographic printing apparatus.For paper person, if can reach high bulk, deflection and opacity, just likely with less fibrous material, reach same paper quality index.And the bulk of slurry has and has direct relation with the bulk of prepared paper, the bulk of slurry is higher, and the bulk of prepared paper is also higher.
In paper process, there are several feasible methods to improve the bulk of paper.As added polymer in slurry.By different technological operations, also can increase paper bulk, as regulated temperature in dry or expressing process, in press polish or superpressure process, reduce pressure.The people such as Rtt have studied high temperature and the impact of soft pressure on paper density.Find that linear pressure has the effect of dominance to the overall tightness of calendered paper, and the temperature of warm-up mill seems more remarkable on the impact of paper density.The people such as Nynren have studied mechanical pulp and change machine slurry is found, as dry at different temperature in paper, its bulk has very large difference, and this difference perhaps can be explained from the viscoplasticity of fiber, namely can from the softening and different slurries of lignin are planted, lignin composition difference be explained.
It will be effective method at present that the high yield pulp (HYP) that use has a high bulk improves paper bulk.HYP also claims " floating whitening machine slurry ", not only has physical strength and the whiteness similar with bleaching broad-leaved wood sulphate pulp (HWKP), but also has some other characteristics preferably, as high bulk, high opacity and higher fiber fines component.Because most of water elements are all retained in HYP, HYP fiber is generally more stiff and in paper-making process, be not easy flat collapsing.Therefore, if contain HYP in paper, so, stiff fiber will form the paper structure of bulky (referring to " adding the impact of high yield pulp on paper bulk and smoothness " of all second places, the > > of < < International Paper, the 26th the 5th phase of volume in 2007: 1-6).
Chinese patent application 03825048.9 provides a kind of three layers of copy paper with improved deflection and bulk and preparation method thereof.Described paper has three major polymers: cellulose and makes and use raising agent as the intermediate core layer of diamides salt puffing.In the both sides of described sandwich layer, impressed starch base metering size press coating, starch wherein has high solids content.Coating formation have around three stratotype paper of the outer field structural I-beam of high strength of low density core.
As everyone knows, the bleaching process of pulping and paper-making industry is to produce the main source Er of bioxin bioxin is the persistent organochlorine compound of a class, have 30 kinds more than, the feature with " carcinogenic, teratogenesis, mutagenesis ", long half time, the residence time reaches 10 years, easily accumulation for a long time in environment, is called as the strongest poisonous substance of toxicity on the earth.Certainly, using for a long time this paper made from bleached pulp to cause serious threat to its health, is " the stealthy killer " of human health.Visible, there is bioxin problem in the method that the above-mentioned high yield pulp (HYP) that has a high bulk by use improves paper bulk, and the method that Chinese patent application 03825048.9 provides need to be added auxiliary agent, and preparation method is complicated, and cost is higher.
For overcoming the defect of above-mentioned prior art, the inventor finds to use the bulk of not floating straw pulp apparently higher than bleaching straw pulp in the research process of being engaged in for a long time pulping and paper-making, when itself and other industrial paper pulp adapted is prepared to various paper product, need not add other auxiliary agents just can make bulk obviously improve, and preparation technology is simple, can also solve well the problem of the health threat that prior art Zhong bioxin causes simultaneously.
Summary of the invention
The first object of the present invention is to provide a kind of mixing slurry with high bulk, this mixing slurry has higher bulk, adopt the paper product of this mixing slurry preparation, need not add other auxiliary agents just can make bulk obviously improve, and preparation technology is simple, can also solve well the problem of the health threat that prior art Zhong bioxin causes simultaneously.
The second object of the present invention is to provide a kind of cultural paper, and the bulk of this cultural paper obviously improves, thereby improves its deflection and opacity, while avoiding paper by duplicator or printer, occurs paper jam phenomenon, and the print through phenomenon of paper.
The 3rd object of the present invention is to provide a kind of paper products formed, and the deflection of this paper products formed is good.
The 4th object of the present invention is to provide a kind of cultural paper or paper products formed with the mixing slurry of high bulk provided by the present invention that contain.
For content of the present invention and technical scheme are clearly described, below first noun used in the present invention is defined as follows, under the inconsistent situation of definition of doing in other any documents and the present invention, with the definition that the present invention was done, be as the criterion, specific as follows:
Bulky straw pulp of the present invention refers to the straw pulp that one or more the combination raw materials that adopts in straw, wheat straw, Chinese alpine rush, giantreed, bagasse or reed obtains through boiling and washing step, or the bulk obtaining through boiling, washing and oxygen delignification step is 2-3cm
3the straw pulp of/g.
Detailed description of the present invention below:
For realizing the first object of the present invention, the present invention adopts following technical scheme:
A kind of mixing slurry with high bulk, contains bulky straw pulp in this mixing slurry, and the bulk of described bulky straw pulp is 2-3cm
3/ g, is preferably 2.3-2.8cm
3/ g, more preferably 2.4-2.6cm
3/ g.
Consisting of of described mixing slurry: the industrial paper pulp of the bulky straw pulp of 20-100% and 0-80%, the preferably bulky straw pulp of 25-93% and the industrial paper pulp of 7-75%, the more preferably industrial paper pulp of the bulky straw pulp of 74-89% and 11-26%; Described industrial paper pulp is one or more in wood pulp, cotton pulp, bamboo pulp or secondary stock.
The slurry of described bulky straw pulp for obtaining through boiling, washing step, or the slurry obtaining through boiling, washing, oxygen delignification step, wherein said boiling obtains hardness as permanganate number 16-28 for take grass kind plant as raw material after boiling, and beating degree is the high-hardness pulp of 10-24 ° of SR.
Preferably, the opacity of described bulky straw pulp is 88%-100%, preferably 90%-99%, more preferably 94%-98%; Air permeability is 300-6500ml/min, preferably 500-5500ml/min, more preferably 1000-5000ml/min.
The tear index of described bulky straw pulp is 3.5-6.0mNm
2/ g, preferably 4.6-5.6mNm
2/ g, more preferably 4.8-5.4mNm
2/ g.
For realizing the second object of the present invention, the present invention adopts following technical scheme:
A kind of cultural paper, comprise paper pulp and papermaking auxiliary material, wherein, described paper pulp comprises the bulky straw pulp of 20-100% and the industrial paper pulp of 0-80%, the preferred bulky straw pulp of 25-93% and the industrial paper pulp of 7-75%, the more preferably industrial paper pulp of the bulky straw pulp of 74-89% and 11-26%; Described industrial paper pulp is one or more in wood pulp, cotton pulp, bamboo pulp or secondary stock; The described whiteness of not floating straw pulp is 30-60%, is preferably 35～55%, more preferably 38～50%, most preferably be 40～45%.
The described bulk of not floating straw pulp is 2-3cm
3/ g, is preferably 2.3-2.8cm
3/ g, more preferably 2.4-2.6cm
3/ g.
The described opacity of not floating straw pulp is 88%-100%, preferably 90%-99%, more preferably 94%-98%; Air permeability is 300-6500ml/min, preferably 500-5500ml/min, more preferably 1000-5000ml/min.
The described tear index that does not float straw pulp is 3.5-6.0mNm
2/ g, preferably 4.6-5.6mNm
2/ g, more preferably 4.8-5.4mNm
2/ g.
The described more preferably bulky straw pulp provided by the present invention of straw pulp of not floating.
Paper described in the present invention is electro-photographic paper, typing paper, offset printing paper, writing paper or newsprint.
Longitudinal deflection of described electro-photographic paper is 0.3-0.5mNm, and lateral stiffness is 0.15-0.25mNm; The opacity of described typing paper is 80-90%; The opacity of described offset printing paper is 80-90%; The opacity of described writing paper is 80-90%.
Further, the opacity of electro-photographic paper of the present invention is 85%-95%, preferably 88%-95%, more preferably 90%-95%.
In the present invention, the quantitative of described electro-photographic paper is 60-100 gram/meter
2, smoothness is 20-30%.
Electro-photographic paper of the present invention can adopt conventional method preparation.For improving the combination property of electro-photographic paper, can add some conventional auxiliary materials, as used modified starch can meet surface strength requirement, add with waterglass, modified starch etc. and improve into paper deflection etc.
In the present invention, described electro-photographic paper auxiliary material used comprises internal sizing agent, Cypres, talcum powder and waterglass.
Above-mentioned internal sizing agent is rosin, aluminum sulfate; Above-mentioned Cypres is modified starch.
Above-mentioned rosin consumption is 0.65～0.75%, and the consumption of described aluminum sulfate is 4.5～5.5%, and the consumption of described modified starch is 2～2.5%.
Contain the electro-photographic paper that does not float straw pulp provided by the present invention, with a small amount of papermaking auxiliary material, just can make its combination property meet the requirements, when using a small amount of papermaking auxiliary material, its performance obviously improves.
For realizing the 3rd object of the present invention, the present invention adopts following technical scheme:
A kind of paper products formed, by paper or paper pulp compacting, molding or curling making, wherein, described paper pulp comprises the bulky straw pulp of 20-100% and the industrial paper pulp of 0-80%, the preferred bulky straw pulp of 25-93% and the industrial paper pulp of 7-75%, the more preferably industrial paper pulp of the bulky straw pulp of 74-89% and 11-26%; Described industrial paper pulp is one or more in wood pulp, cotton pulp, bamboo pulp or secondary stock; The described whiteness of not floating straw pulp is 30%-60%,, be preferably 35～55%, more preferably 38～50%, most preferably be 40～45%.
The described bulk of not floating straw pulp is 2-3cm
3/ g.
For realizing the 4th object of the present invention, the present invention adopts following technical scheme:
Paper or a paper products formed, wherein, described paper or paper products formed contain above-mentioned mixing slurry provided by the present invention.
In described mixing slurry, contain bulky straw pulp, the bulk of described bulky straw pulp is 2-3cm
3/ g, is preferably 2.3-2.8cm
3/ g, more preferably 2.4-2.6cm
3/ g.
Consisting of of described mixing slurry: the industrial paper pulp of the bulky straw pulp of 20-100% and 0-80%, the preferably bulky straw pulp of 25-93% and the industrial paper pulp of 7-75%, the more preferably industrial paper pulp of the bulky straw pulp of 74-89% and 11-26%; Described industrial paper pulp is one or more in wood pulp, cotton pulp, bamboo pulp or secondary stock.
Bulky straw pulp of the present invention or do not float straw pulp and can be prepared as follows:
1, Ammonium Sulfite Method:
(1) in removing deimpurity dogstail raw material, add steaming preparation, wherein the consumption of ammonium sulfite is over dry material quantity 9-20%, joins the 0-15% that amount of sodium hydroxide is over dry material quantity, and liquor ratio is 1:2-9;
(2) pass into Steam Heating, heating-up temperature is 120-250 ℃, and be 100-250 minute heat time heating time, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Wherein can be preferably:
(1) in grass kind plant raw material, add cooking liquor, wherein ammonium sulfite consumption is the 9-13% to over dry material quantity, joins the 0-8% that amount of sodium hydroxide is over dry material quantity, and liquor ratio is 1:2-4;
(2) be heated to temperature 165-173 ℃, the omnidistance time 160-210 minute of boiling, and then obtain described bulky straw pulp or do not float grass through shove, pulp washing.Obtaining bulky slurry or not floating straw pulp permanganate number is 16～28, preferably 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, and then obtain described bulky straw pulp or do not float straw pulp through shove, pulp washing.
3, caustic soda-anthraquinone method:
(1) in 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, anthraquinone addition is the 0.5-2.0 ‰ of over dry material quantity;
(2) be heated to temperature 120-200 ℃, the omnidistance time 100-250 minute of boiling, and then obtain described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Wherein can be preferably:
(1) in 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, anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity;
(2) be heated to temperature 160-165 ℃, the omnidistance time 140-190 minute of boiling, and then obtain described bulky straw pulp or do not float grass through shove, pulp washing.Obtaining bulky slurry or not floating straw pulp permanganate number is 16～28, preferably 16～25.
4, sulfate process
(1) in grass kind plant raw material, add cooking liquor, wherein alkali charge be NaOH meter to over dry material quantity 5-15%, liquor ratio is 1:2-10, sulphidity is 3-15%;
(2) be heated to temperature 150-200 ℃, the omnidistance time 100-250 minute of boiling, and then obtain described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Wherein can be preferably:
(1) in grass kind plant raw material, add cooking liquor, wherein alkali charge be NaOH meter to over dry material quantity 8-11%, liquor ratio is 1:2-4, sulphidity is 5-8%;
(2) be heated to temperature 165-173 ℃, the omnidistance time 150-200 minute of boiling, and then obtain described bulky straw pulp or do not float grass through shove, pulp washing.Obtaining bulky slurry or not floating straw pulp permanganate number is 16～28, preferably 16～25.
5, alkaline sodium sulfite-anthraquinone boiling comprises:
(1) in dogstail raw material, add cooking liquor, wherein, sodium hydroxide concentration counts 9-15% with 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) be heated to temperature 150-180 ℃, intensification, little venting, the omnidistance time 95-190 minute of insulation, and then obtain described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Method for optimizing comprises:
(1) in dogstail raw material, add cooking liquor, wherein, sodium hydroxide concentration counts 9-15% with 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;
Be heated to temperature 160-165 ℃, intensification, little venting, the omnidistance time 140-190 minute of insulation, and then obtain described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Obtaining bulky slurry or not floating straw pulp permanganate number is 16～28, preferably 16～25.
Above-mentioned bulky straw pulp or do not float straw pulp also can be according to the preparation of method below:
1, Ammonium Sulfite Method:
Grass raw material is added in pot, add again cooking liquor, cooking liquor is warming up to 100-200 ℃, boost to 0.3-0.9MPa, digestion time is 150-250 minute, in described steaming preparation, wherein ammonium sulfite consumption is the 5-20% to over dry material quantity, join the 0-15% that amount of sodium hydroxide is over dry material quantity, liquor ratio is 1:2-15, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Wherein can be preferably:
Grass raw material is added in pot, add again cooking liquor, cooking liquor is warming up to 156-173 ℃, boost to 0.6-0.75MPa, digestion time is 180-220 minute, in described steaming preparation, wherein ammonium sulfite consumption is the 9-15% to over dry material quantity, join the 0-8% that amount of sodium hydroxide is over dry material quantity, liquor ratio is 1:6-10, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Obtaining bulky slurry or not floating straw pulp permanganate number is 16～28, preferably 16～25.
2, caustic soda-anthraquinone method:
Grass kind plant raw material is entered in digester, after dress pot is full, close pot cover, boiling temperature is 100-200 ℃, boost to 0.3-0.9MPa, digestion time is 150-250 minute, in described steaming preparation simultaneously, alkali charge is to over dry material quantity 5-20% in NaOH, liquor ratio is 1:2-15, and anthraquinone addition is the 0.2-1.5 ‰ of over dry material quantity, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Wherein can be preferably:
Grass kind plant raw material is entered in digester, after dress pot is full, close pot cover, boiling temperature is 147-165 ℃, boost to 0.4-0.6MPa, digestion time is 160-220 minute, in described steaming preparation simultaneously, alkali charge is to over dry material quantity 9-17% in NaOH, liquor ratio is 1:6-9, and anthraquinone addition is the 0.5-0.8 ‰ of over dry material quantity, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Obtaining bulky slurry or not floating straw pulp permanganate number is 16～28, preferably 16～25.
3, kraft cooking is:
Grass kind plant raw material is entered in digester, after dress pot is full, close pot cover, boiling temperature is 100-200 ℃, boost to 0.3-0.9MPa, digestion time is 150-280 minute, in described steaming preparation simultaneously, alkali charge is that NaOH meter is to over dry material quantity 5-20%, liquor ratio is 1:5-15, and sulphidity is 3-15%, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Wherein can be preferably:
Grass kind plant raw material is entered in digester, after dress pot is full, close pot cover, boiling temperature is 155-168 ℃, boost to 0.5-0.65MPa, digestion time is 200-250 minute, in described steaming preparation simultaneously, alkali charge is that NaOH meter is to over dry material quantity 8-13%, liquor ratio is 1:6-10, and sulphidity is 5-9%, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Obtaining bulky slurry or not floating straw pulp permanganate number is 16～28, preferably 16～25.
4, alkaline sodium sulfite-anthraquinone boiling comprises:
Grass raw material is added in pot, add again cooking liquor, 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 described steaming preparation, wherein the consumption of NaOH is counted 9-17% with 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 grass raw material in pot, add again cooking liquor, 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 described steaming preparation, wherein the consumption of NaOH is counted 9-17% with 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, liquor ratio is 1:6-10, and then obtains described bulky straw pulp or do not float straw pulp through shove, pulp washing.
Before the boiling step of said method, can also comprise and grass raw material be carried out to pretreated process, the process of grass type stalk being flooded.Preferably, make maceration extract ratio reach 1:2-4.Dip time and temperature can be adjusted according to grass type stalk used, and this adjustment is apparent to those skilled in the art.Yet, preferably under normal pressure, at 85 ℃ or higher temperature, in spiral macerator, be incubated and mix 10 minutes or the longer time.More preferably between 85-95 ℃, insulation mixes 10-40 minutes, makes like this maceration extract fully contact with raw material, makes the dipping of raw material evenly complete.Before raw material is flooded, can adopt prior art to carry out preliminary treatment to raw material, adopt conventional dry, wet feed preparation, with except impurity such as defoliation, fringe, grain, marrows, can alleviate like this pressure of subsequent technique, and improve the quality of straw pulp.Dry, wet feed preparation can adopt existing conventional equipment, as chaffcutter, screening machine, dust removal machine, wet scrubbing Straw-crumbling machine, inclined helix dehydrator etc.The fibers in grass class raw material of the removal moisture after getting the raw materials ready can be also fine fodder, and the moisture of deduction dogstail is over dry grass, and the length of general blade is at 15-30mm, and the technique of getting the raw materials ready of raw material is known to the skilled person technology.
After the boiling of said method or after pulp washing, also can add oxygen delignification process, wherein oxygen delignification process is preferably:
1) concentration of gained high-hardness pulp after adjusting boiling;
2) this stock pump is delivered to oxygen delignification reaction tower, and add NaOH and oxygen;
3) this slurry carries out oxygen delignification reaction in this oxygen delignification reaction tower.
After described adjusting boiling, the concentration of gained high-hardness pulp refers to that by the concentration adjustment of described slurry be 8-18%, that is to say, preferably in carry out oxygen delignification under dense condition.In the major advantage of dense oxygen delignification be: invest less; Due in the success of dense mixing and pumping technology, the processing of slurry is dense more much easier than high; Slurry concentration is lower, and the corrosion of equipment is few, the danger of also not burning in oxygen.
Described oxygen delignification is preferably single hop oxygen delignification, in oxygen delignification reaction tower, carries out.In oxygen delignification process, the temperature of described Jiang Gai reaction tower import department is preferably 95-100 ℃, and pressure is preferably 0.9-1.2MPa, and the temperature in exit is preferably 100-105 ℃, and pressure is preferably 0.2-0.4MPa.
In described oxygen delignification, alkali charge is preferably the 2-4% to oven dry stock amount in NaOH, and the addition of oxygen is preferably slurry 20-40kg per ton; The reaction time of described slurry in this reaction tower is preferably 60-90 minutes.
Before described oxygen delignification, preferably paper pulp is carried and be heated to 70 ℃ and deliver to a slurry pipe.
In described oxygen delignification process, preferably add the magnesium salts of oven dry stock weight 0.2-1% as protective agent.
Starch degree after oxygen delignification is preferably permanganate number 10-14, is equivalent to the high-hardness pulp of card uncle valency 13-19.8.
More preferably, the starch degree obtaining after oxygen delignification reaction is permanganate number 11-13, and being equivalent to card uncle valency is 14.5-17.9.
Bulky straw pulp prepared by employing said method or the bulk of not floating straw pulp are high, thereby adopt bulky straw pulp prepared by the inventive method or do not float that paper bulk prepared by straw pulp is high, opacity is high, the raising of bulk improves the deflection of its paper, thereby avoid the generation of the phenomenons such as paperboard, the raising of opacity can prevent and treat paper print through.
The present invention is below described in further detail:
In mixing slurry provided by the present invention, contain bulky straw pulp.
Because papermaking straw pulp exists a lot of shortcomings, as poor in slurry water filtering performance; When manufacturing paper with pulp, paper machine easily breaks end; Paper strength is lower, and especially elongation when tear index, folding strength, fracture is all quite low, the obvious embrittlement of paper; Surface strength of paper is low, easily falls hair etc. when printing, thereby has greatly limited the application of straw pulp.The inventor is surprised to find that while being furnished with bulky straw pulp of the present invention in mixing slurry, not only can improve paper pulp manufacture paper with pulp performance, improve paper quality, and because this bulky straw pulp is not through bleaching, not only reduced pulping process, saved the time, also do not contain the carcinogens such as bioxin and adsorbable organohalogen compounds, the more important thing is that the combination property of this bulky straw pulp is not because the corresponding reduction without bleaching, contrary some performance has also strengthened, as bulk, opacity and air permeability etc., thereby its combination property is improved.
In the present invention, the bulk of described bulky straw pulp is 2-3cm
3/ g, is preferably 2.3-2.8cm
3/ g, more preferably 2.4-2.6cm
3/ g.
In prior art, the raising of paper bulk has the high yield pulp (HYP) of high bulk by use often or adds that some auxiliary agents improve, thus the deflection of corresponding raising paper and opacity; And the raising of paper opacity also by adding, some auxiliary agents improve often.And the inventor finds that in long-term pulp-making research the bulk of this bulky straw pulp provided by the present invention is apparently higher than bleaching straw pulp, bulk due to bulky straw pulp improves on the one hand, the bulk of the mixed pulp that it contains this bulky straw pulp is also apparently higher than the mixing slurry that contains bleaching straw pulp, thereby the bulk that adopts the mixing that contains this bulky straw pulp to starch prepared paper product also obviously improves, thereby bulk, opacity and the deflection of paper have been improved.
Visible, although this bulky straw pulp provided by the present invention is because it reduces its whiteness without crossing bleaching, other performance is not because of the corresponding reduction without bleaching, and some performance has also strengthened on the contrary, as bulk, opacity and air permeability etc., thereby its combination property is improved.
Wood pulp of the present invention, bamboo pulp, cotton pulp or secondary stock are that natural color pulp is or/and bleached pulp.
Wood pulp in the present invention, bamboo pulp, cotton pulp or secondary stock can be used natural color pulp, also available bleached pulp, and also the mixing of available natural color pulp and bleached pulp slurry, can realize the present invention.But the mixing slurry that preferably adopts natural color pulp and bleached pulp, more preferably all adopts natural color pulp.And in the mixing slurry of natural color pulp and bleached pulp, take again natural color pulp as main body, with addition of a small amount of bleached pulp.
Wood pulp, bamboo pulp, cotton pulp or the secondary stock also noxious material such as Hui bioxin in bleaching process.The preferred wood pulp of the present invention, bamboo pulp, cotton pulp or the natural color pulp of secondary stock and the mixing of bleached pulp are starched, and more preferably all adopt the natural color pulp of wood pulp, bamboo pulp, cotton pulp or secondary stock.Paper provided by the present invention so just adopts natural color pulp completely, in whole process completely without bleaching, do not contain the carcinogens such as bioxin and adsorbable organohalogen compounds, long-term use can not threaten to people's health, is the paper of a kind of overall safety, health, health.
In the present invention, the described straw pulp that do not float adopts the method that well known to a person skilled in the art to prepare.Its concrete preparation method comprises: get the raw materials ready, boiling.
Above-mentioned preparation method also can further comprise oxygen delignification.
Above-mentionedly get the raw materials ready, boiling and oxygen delignification be the method for well known to a person skilled in the art.
In paper provided by the present invention or paper products formed, described paper pulp contains and does not float straw pulp.It has been generally acknowledged that, straw pulp is after bleaching, and its performance has improved, and without its performance of bleaching, is difficult to reach copy paper requirement, adds the shortcoming of straw pulp self, has greatly limited the application of straw pulp, has limited especially the application of not floating straw pulp.Although it is rear because it reduces its whiteness without crossing bleaching without bleaching that the inventor finds straw pulp, but other performance is not because the corresponding reduction without bleaching, contrary some performance has also strengthened, and as bulk, opacity and air permeability etc., thereby its combination property is improved.
In the present invention, longitudinal deflection of described electro-photographic paper is 0.3-0.5mNm, and lateral stiffness is 0.15-0.25mNm; The cup body deflection of described dixie cup is 2.0-2.5N.
Deflection is to weigh the index of paper and the resistance to flexibility of cardboard.Deflection and paper have direct relation at printer and the operating performance of duplicator.Paper sheet stiffness is larger, and just, more easily by these photographic printing apparatus, the problem of paperboard will reduce; Deflection is larger, and the resistance to flexibility of its moulding article and cardboard is just larger.And deflection is decided by bulk to a great extent.In the present invention, described paper or moulding article contain mixing of the present invention slurry, due in described mixing slurry, contain bulk high do not float straw pulp, thereby the bulk of its paper is obviously improved, and then improved the deflection of paper or paper products formed.
In the present invention, the opacity of described typing paper is 80-90%; The opacity of described offset printing paper is 80-90%; The opacity of described writing paper is 80-90%; The opacity of described electro-photographic paper is 85%-95%, preferably 88%-95%, more preferably 90%-95%.
Opacity is one of optical property of paper, also be an important quality index of printing paper, writing paper, loan and some industrial and technical papers, requirement has higher opacity, for cultural printing, as newsprint, opacity is low will cause occurring shadow-mark, print through phenomenon, and impact is used.In the present invention, on the one hand high owing to not floating the opacity of straw pulp itself, the opacity that makes to contain the mixing slurry that does not float straw pulp improves, thereby the opacity of the cultural printing prepared is obviously improved, and then prevents print through; And on the other hand, owing to not floating, the bulk of straw pulp is high, the bulk that makes to contain the mixing slurry that does not float straw pulp improves, and bulk has determined opacity to a great extent, thereby the also corresponding raising of the opacity of its paper.
Compared with prior art, mixing provided by the present invention slurry and contain the paper product tool that this mixings starches and have the following advantages:
(1) mixing slurry provided by the present invention has higher bulk;
(2) paper or the paper products formed that contain mixing slurry provided by the present invention not only have higher bulk, and have higher deflection and resistance to flexibility, easily smoothly by duplicator or printer, avoid paper jam phenomenon to occur;
(3) the cultural printing opacity that contains mixing slurry provided by the present invention is higher, can prevent print through;
(4), while adopting mixing slurry provided by the present invention to manufacture paper with pulp paper product, paper machine speed improves greatly;
(5) adopt mixing provided by the present invention to starch prepared paper for daily use, food wrapper, medicinal paper or moulding article, because the straw pulp of joining in its mixing slurry is not for floating straw pulp, thereby reduce or avoided bleaching to bring the carcinogens such as bioxin and adsorbable organohalogen compounds, thus also avoided bleaching the harm that brings to human body.
(6) straw pulp of joining in mixing slurry provided by the present invention is not for floating straw pulp, not through bleaching, the possibility that hydroxyl in cellulose and hemicellulose and aldehyde radical change into active carboxyl or carbonyl diminishes, thereby has reduced the generation of yellowing reversion of pulp phenomenon, the i.e. generation of aging phenomenon.
The specific embodiment
Be below 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 1-7 is for adopting soda processes preparation not float straw pulp, and the performance of wherein not floating straw pulp is that the slurry obtaining after boiling, washing adopts conventional method to record.
Table 1, soda pulping parameter
The cm of bulk unit in form
3/ g, air permeability units/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.
2, embodiment 8-14 is for adopting caustic soda-aq method preparation not float straw pulp, and the performance of wherein not floating straw pulp is that the slurry obtaining after boiling, washing adopts conventional method to record.
Table 2, caustic soda-AQ legal system slurry parameter
3, embodiment 15-22 is for adopting sulfate process preparation not float straw pulp, and the performance of wherein not floating straw pulp is that the slurry obtaining after boiling, washing adopts conventional method to record.
Table 3, sulfate pulping parameter
4, embodiment 23-28 is for adopting the standby straw pulp that do not float of alkaline sodium sulfite-AQ legal system, and the performance of wherein not floating straw pulp is that the slurry obtaining after boiling, washing adopts conventional method to record.
Table 4, alkaline sodium sulfite-AQ legal system slurry parameter
5, embodiment 29～34 is for adopting Ammonium Sulfite Method preparation not float straw pulp, and the performance of wherein not floating straw pulp is that the slurry obtaining after boiling, washing adopts conventional method to record.
Table 5, pulping with ammonium sulfite method parameter
By form above, can be found out, employing can by bulky slurry or not float the boiling of straw pulp hardness be 16～28 to permanganate number, the straw pulp that preferably prepared by the Ammonium Sulfite Method in 16～25 scopes, and it is higher that performance obtains than additive method.
6, adopt different pulping process and oxygen delignification preparation not to float straw pulp
The resulting slurry of above-described embodiment is carried out obtaining not floating straw pulp after oxygen delignification again.
The method of oxygen delignification of the present invention adopts conventional method or the disclosed method of ZL200710143130.0 to carry out.
Table 6, the different prepared slurries of slurrying embodiment carry out the performance of not floating straw pulp obtaining after oxygen delignification
Note: 1#, 5#, 12#, 18#, 23# and 28# refer to respectively above-described embodiment 1,5,12,18,23 and 28 resulting slurries.
It is similar to table 5 that the prepared slurry of other slurrying embodiment adopts conventional method or the disclosed method of ZL200710143130.0 to carry out the performance of not floating straw pulp that obtains after oxygen delignification.
Equally also can adopt Ammonium Sulfite Method to carry out slurrying, for example can be with reference to patent application 200710129635.1.
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 swallow Jian Hua, Wang Cuilian, Zhang Jiyan, < < paper and papermaking > >, the 3rd phase of July in 1993: 23-24), difference is the proportioning difference that raw material mixes slurry.The performance parameter of the electro-photographic paper that different mixing slurry preparations is prepared is as shown in table 7:
Table 7, different mixing slurries are prepared the performance parameter of prepared electro-photographic paper
Note: No. 16# slurry for embodiment 16 prepared do not float straw pulp, No. 6# slurry for embodiment 6 prepared do not float straw pulp, by that analogy.
As can be seen from Table 7, adopt and not float the electro-photographic paper that other paper pulp of straw pulp adapted manufactures paper with pulp and meet national standard, some performance is even better than national standard, as vertical lateral stiffness obviously increases.
2, the preparation of dixie cup
By a certain amount of above-described embodiment prepared do not float straw pulp and other paper pulp is prepared (preparation of slurry is as shown in table 4), two kinds of slurries are pulled an oar respectively, do not float 48 ° of SR of straw pulp beating degree, weight in wet base is 1.9g, 40 ° of SR of other pulp beating degree, weight in wet base is 1.4g, after the slurry after making beating is mixed, obtains mixing slurry.The mixing slurry of gained is manufactured paper with pulp into paper according to conventional method, then according to conventional method through PE film, cut, printing, cross cutting and molding procedure prepare the dixie cup that specification is 250ml.
Table 8, different mixing slurries are prepared the performance parameter of prepared dixie cup
Note: 1# slurry for embodiment 1 prepared do not float straw pulp, 8# slurry for embodiment 8 prepared do not float straw pulp, by that analogy.
As can be seen from Table 8, adopt and not float dixie cup prepared by other paper pulp of straw pulp adapted and meet national standard, some performance is even better than national standard, as cup body deflection.
3, the preparation of typing paper
Referring to " brief talk the production of typing paper and put into practice ", (" brief talk the production of typing paper and put into practice " encouraged to the preparation method of typing paper by Liu Liyuan, kind unit, < < Hunan papermaking > >, the 2nd phase of calendar year 2001: 10-11), difference is the proportioning difference that raw material mixes slurry.The performance parameter of the electro-photographic paper that different mixing slurry preparations is prepared is as shown in table 9:
Table 9, different mixing slurries are prepared the performance parameter of prepared typing paper
Note: 23# slurry for embodiment 23 prepared do not float straw pulp, 24# slurry for embodiment 24 prepared do not float straw pulp.
As can be seen 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 meets national standard.
4, the preparation of offset printing paper
Table 10, different mixing slurries are prepared the performance parameter of prepared hectographic printing paper using
Note: 25# slurry for embodiment 25 prepared do not float straw pulp, 24# slurry for embodiment 24 prepared do not float straw pulp.
As can be seen 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, and other index meets national standard.
5, the preparation of writing paper
The preparation method of writing paper is referring to patent ZL87101416.5 copy paper method, and difference is the proportioning difference that raw material mixes slurry.The performance parameter of the writing paper that different mixing slurry preparations is prepared is as shown in table 11:
Table 11, different mixing slurries are prepared the performance parameter of prepared writing paper
Note: 26# slurry for embodiment 26 prepared do not float straw pulp, 28# slurry for embodiment 28 prepared do not float straw pulp, by that analogy.
As can be seen 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, and other index meets national standard.
6, newsprint
The preparation method of newsprint is referring to patent application CN93108185 manufacture method, and difference is the proportioning difference that raw material mixes slurry.The performance parameter of the newsprint that different mixing slurry preparations is prepared is as shown in table 12:
Table 12, different mixing slurries are prepared the performance parameter of prepared newsprint
Note: 26# slurry for embodiment 26 prepared do not float straw pulp, 28# slurry for embodiment 28 prepared do not float straw pulp, by that analogy.
As can be seen from Table 12, adopt and not float the newsprint that other paper pulp of straw pulp adapted is manufactured paper with pulp, owing to not floating the performance of straw pulp, make it copy its opacity of newsprint, the smoothness made very high, other index meets national standard.
Be below adapted do not float straw pulp and the prepared paper product of adapted bleaching straw pulp Performance Ratio.
Comparative example 1
Table 13 pair whole wood pulp (batching A), be equipped with 50% bleached wheat straw pulp (batching B) and be equipped with 50% quality of not floating the copy paper that Straw Pulp (batching C) produces and contrast.Batching A and batching B and batching C manufacture paper with pulp under same paper machine, condition of similarity, by more known, be equipped with the closely similar of paper main performance that 50% bleached wheat straw pulp manufactures paper with pulp and whole wood pulp, and be equipped with 50%, do not float paper main performance that Straw Pulp manufactures paper with pulp compared with the making moderate progress of whole wood pulp, and performance is better than being equipped with the paper that 50% bleached wheat straw pulp is manufactured paper with pulp.
Table 13. whole wood pulp copy paper be equipped with 50% bleached wheat straw pulp and be equipped with the 50% copy paper Performance Ratio that does not float 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 (pressures) and refer to and adopt this area conventional method to detect, do not float (not pressing) and bleach (pressure) and adopt detection with the following method:
(1) page is manufactured paper with pulp
Closing water discharging valve, clip storage slurry device, open inlet valve to rinse net, allow waterborne being raised at least higher than wire side 50mm place, is quantitatively 60 ± 3.0g/m by what copy into page
2amount pour slurry (calculating by oven-dry weight) into.
Water is added on mark horizontal line, insert agitator, and mobile stirred suspension lightly up and down, agitating plate should remain under suspension liquid level when stirring, move up and down for six times back and forth and can guarantee that slurry and water mix completely completely, then, before taking-up agitator, then stirring gently once, wait 10s quietly, promptly all open subsequently emptying valve.
When water is from copper mesh filters, to online in type page, the suction time that reduces pressure is about 10% left and right of drainage time, but is no less than 5s, has obtained page.
(2) detect the performance of slurry
Step (1) page of making of copying is surveyed to various performances according to following method respectively:
Quantitatively according to GB 451 < < paper and Board sizes, degree of skewness, quantitatively, the determination method > > of thickness and tightness measures, and according to tightness, can calculate bulk.
Tensile index is measured by the determination method > > of GB 453 < < paper and Board tensile strength and percentage elongation.
Tear index is measured according to the assay method > > of GB 455 < < paper and Board tearabilities, obtains divided by the sample through warm and humid processing, quantitatively can calculating tear index after tearability.
Folding strength is measured by the determination method > > of GB 457 < < paper folding strengths.
Air permeability is measured by determination method (Ge Erlaifa) the > > of GB 5402 < < paper and cardboard air permeability.
Whiteness is measured by mensuration diffuse reflection/normal beam technique > > of GB/T 7974-2002 < < paper, cardboard and brightness of pulp (whiteness).
Table 14, Shandong Qualin Paper Industry Co., Ltd.'s laboratory report (mean value)
Detection of content: handsheet detects the date: on November 5th, 2008
Inspection Unit: quality control department
As can be seen from Table 14, the bulk of brown stock, opacity and air permeability are all better than bleached pulp.
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.
Meeting flavescence gradually after paper pulp is placed a period of time under common environment or specified conditions, whiteness decrease to some degree, i.e. the brightness reversion phenomenon of paper pulp.This brightness reversion phenomenon is due under illumination and oxygen existence condition, the various free radicals of the oxidized generation of paper pulp.Phenolic hydroxyl group in lignin homolysis under the effect of ultraviolet light or free radical produces phenol oxygen-cent red radical, and phenol oxygen-cent red radical is oxidized to coloured o-quinone structure by peroxy radical.There is bibliographical information (referring to " the inhibition of pulp brightness reversion progress of research " of Dong Cuihua etc., < < paper and papermaking > >, June the 27th in 2008 volume: 33-37) bleaching the brightness reversion of paper pulp is also had to impact, this is because cellulose and hemicellulose are in bleaching oxidizing process, and hydroxyl and aldehyde radical change into active large carboxyl or carbonyl and easily cause yellowing reversion of pulp; Metal ion, particularly heavy metal ion can play catalytic action in bleaching, accelerate the oxidation of bleaching process.
Table 15, Shandong Qualin Paper Industry Co., Ltd.'s laboratory report (mean value)
Detection of content: Straw Pulp handsheet detects the date: on November 15th, 2008
| 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 | 4.24 | 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 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 aging) | 61.1 | 1.783 | 5.032 | 49.3 | 13.7 | 3.01 | 184 | 61.4 | 88.10/10.04/9.54 |
Result shows, compares with bleached pulp, and natural color pulp is difficult for brightness reversion, anti-ageing 44: performance is more superior.
Claims (25)
1. a mixing slurry with high bulk, is characterized in that, in described mixing slurry, contains bulky straw pulp, and the bulk of described bulky straw pulp is 2-3cm
3/ g, opacity is 88-100%, and air permeability is 300-6500ml/min, and tear index is 3.5-6.0mNm
2/ g, the slurry of described bulky straw pulp for obtaining through boiling, washing step, or the slurry obtaining through boiling, washing, oxygen delignification step, wherein said boiling obtains hardness as permanganate number 16-28 for take grass kind plant as raw material after boiling, and beating degree is the high-hardness pulp of 10-24 ° of SR.
2. mixing slurry according to claim 1, is characterized in that, the bulk of described bulky straw pulp is 2.3-2.8cm
3/ g.
3. mixing slurry according to claim 2, is characterized in that, the bulk of described bulky straw pulp is 2.4-2.6cm
3/ g.
4. mixing slurry according to claim 1, is characterized in that, what described mixing was starched consists of: the industrial paper pulp of the bulky straw pulp of 20-100% and 0-80%; Described industrial paper pulp is one or more in wood pulp, cotton pulp, bamboo pulp or secondary stock.
5. mixing slurry according to claim 4, is characterized in that, the bulky straw pulp that consists of 25-93% of described mixing slurry and the industrial paper pulp of 7-75%.
6. mixing slurry according to claim 5, is characterized in that, the bulky straw pulp that consists of 74-89% of described mixing slurry and the industrial paper pulp of 11-26%.
7. a cultural paper, comprises paper pulp and papermaking auxiliary material, it is characterized in that, described paper pulp comprises the bulky straw pulp of 20-100% and the industrial paper pulp of 0-80%; Described industrial paper pulp is one or more in wood pulp, cotton pulp, bamboo pulp or secondary stock; The whiteness of described bulky straw pulp is 30-60%; The bulk of described bulky straw pulp is 2-3cm
3/ g, opacity is 88-100%, and air permeability is 300-6500ml/min, and tear index is 3.5-6.0mNm
2/ g, the slurry of described bulky straw pulp for obtaining through boiling, washing step, or the slurry obtaining through boiling, washing, oxygen delignification step, wherein said boiling obtains hardness as permanganate number 16-28 for take grass kind plant as raw material after boiling, and beating degree is the high-hardness pulp of 10-24 ° of SR.
8. cultural paper according to claim 7, is characterized in that, described paper pulp comprises the bulky straw pulp of 25-93% and the industrial paper pulp of 7-75%.
9. cultural paper according to claim 8, is characterized in that, described paper pulp comprises the bulky straw pulp of 74-89% and the industrial paper pulp of 11-26%.
10. cultural paper according to claim 7, is characterized in that, the whiteness of described bulky straw pulp is 35～55%.
11., cultural paper according to claim 10, is characterized in that, the whiteness of described bulky straw pulp is 38～50%.
12. cultural papers according to claim 11, is characterized in that, the whiteness of described bulky straw pulp is 40～45%.
13. cultural papers according to claim 7, is characterized in that, the bulk of described bulky straw pulp is 2.3-2.8cm
3/ g.
14. cultural papers according to claim 13, is characterized in that, the bulk of described bulky straw pulp is 2.4-2.6cm
3/ g.
15. cultural papers according to claim 7, is characterized in that, described cultural paper is electro-photographic paper, typing paper, offset printing paper, writing paper or newsprint.
16. cultural papers according to claim 15, is characterized in that, longitudinal deflection of described electro-photographic paper is 0.3-0.5mNm, and lateral stiffness is 0.15-0.25mNm; The opacity of described typing paper is 80-90%; The opacity of described offset printing paper is 80-90%; The opacity of described writing paper is 80-90%.
17. 1 kinds of paper products formeds, by paper or paper pulp compacting, molding or curling making, is characterized in that, described paper pulp comprises the bulky straw pulp of 20-100% and the industrial paper pulp of 0-80%; The whiteness of described bulky straw pulp is 30%-60%; The bulk of described bulky straw pulp is 2-3cm
3/ g, opacity is 88-100%, and air permeability is 300-6500ml/min, and tear index is 3.5-6.0mNm
2/ g, the slurry of described bulky straw pulp for obtaining through boiling, washing step, or the slurry obtaining through boiling, washing, oxygen delignification step, wherein said boiling obtains hardness as permanganate number 16-28 for take grass kind plant as raw material after boiling, and beating degree is the high-hardness pulp of 10-24 ° of SR.
18. paper products formeds according to claim 17, is characterized in that, described paper pulp comprises the bulky straw pulp of 25-93% and the industrial paper pulp of 7-75%.
19. paper products formeds according to claim 18, is characterized in that, described paper pulp comprises the bulky straw pulp of 74-89% and the industrial paper pulp of 11-26%.
20. paper products formeds according to claim 17, is characterized in that, the whiteness of described bulky straw pulp is 35～55%.
21. paper products formeds according to claim 20, is characterized in that, the whiteness of described bulky straw pulp is 38～50%.
22. paper products formeds according to claim 21, is characterized in that, the whiteness of described bulky straw pulp is 40～45%.
23. paper products formeds according to claim 17, is characterized in that, described paper products formed is paper container, paper pallet or paper liner.
24. paper products formeds according to claim 23, is characterized in that, described paper container is dixie cup, paper disc, paper lunch-box or paper dish.
25. paper products formeds according to claim 24, is characterized in that, the cup body deflection of described dixie cup is 2.0-2.5N.
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| CN105113321A (en) * | 2015-08-13 | 2015-12-02 | 合肥龙发包装有限公司 | High-strength paper pulp and preparation method therefor |
| CN105088854A (en) * | 2015-08-13 | 2015-11-25 | 合肥龙发包装有限公司 | Environmentally-friendly package paper |
| CN106087535A (en) * | 2016-06-13 | 2016-11-09 | 浙江华川实业集团有限公司 | A kind of drinking cup body paper do not bleached and preparation method thereof |
| CN107663800B (en) * | 2017-09-30 | 2020-11-17 | 潍坊恒联浆纸有限公司 | Natural color poplar pulp and production process thereof |
| CN108486948B (en) * | 2018-03-15 | 2020-12-08 | 中国制浆造纸研究院衢州分院 | Production process of natural-color paper cup base paper |
| CN113512905A (en) * | 2020-04-09 | 2021-10-19 | 刘永胜 | Paper holder processing technology |
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