CN1079463C - High-whiteness low-weight newsprinting paper and its production method - Google Patents
High-whiteness low-weight newsprinting paper and its production method Download PDFInfo
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Abstract
The present invention relates to regeneration newsprinting paper with high whiteness and low fixed quantity and a production method of the regeneration newsprinting paper. The regeneration newsprinting paper has the microstructure that deinked chemical pulp used as long fiber, deinked mechanical pulp or mechanochemical pulp used as medium fiber and mineral ultrafine fiber used as short fiber form a network structure together; surfaces of the long fiber, the medium fiber and the mineral ultrafine fiber are stuck with mineral superfine powder with high whiteness and high nontransparency; paper pulp modified material containing the mineral ultrafine fiber and the mineral superfine powder and provided by the present invention only needs to be added into deinked paper pulp, and the newsprinting paper with the high whiteness and the low fixed quantity can be produced.
Description
The present invention relates to low quantitative regenerated newsprint and the manufacture method thereof of a kind of high whiteness.Particularly, relate to the low quantitative regenerated newsprint of high whiteness that utilizes the waste paper manufacturing that contains printing ink, and manufacture method.
Human the biggest problem that faces in 21 century is resource scarcity and environmental protection day by day.The required wood pulp of traditional mode of production newsprint is from timber, through peeling, chip, operations such as boiling, washing, bleaching, making beating, consume a large amount of timber on the one hand, can produce a large amount of pollutants such as black liquor on the other hand in pulping process, both all produce heavy damage to ecological, environment.Utilizing reclaimed waste paper to produce regenerated newsprint is the important outlet that solves resource problem.But because the deinking pulp brightness only can reach the 85-90% of body paper whiteness, and intensity and opacity all be restricted, only can production whiteness≤45% (ISO), quantitatively 〉=51g/m
2Low-grade regenerated newsprint.Chinese patent literature CN1167854 number, a kind of " producing the method for regenerated newsprint with waste paper " disclosed, adopt boiling, deinking, bleaching, making beating, purify, copy technology such as paper, the regenerated newsprint performance of production is not seen any explanation.China's 1999 the 1st phases of " paper pulp and paper " magazine report, Shanghai Han Song potentiality paper industry company introduces external sophisticated equipment, in 1998 the BCIMP with 95% waste paper and 5-7% (or BKP) quantitatively be 48.8g/m for raw material production goes out
2Newsprint, its whiteness has reached 58% (ISO), is the frame news advanced level of paper of China.Yet it is huge to introduce the investment of this cover special equipment, and domestic general papermaking enterprise is difficult to bear.
Along with process printing increasingly extensive use in newspaper, require newsprint to have higher whiteness.Generally all between 48-55% (ISO), the whiteness of regenerated newsprint generally is lower than 52% (ISO) to the primary newsprint whiteness of China." bleaching of disregard message paper deinking slurry " literary composition that 1999 the 3rd periodicals of " Chinese papermaking " magazine carry, report adopts two-part H
2O
2Bleaching, the whiteness of disregard message paper deinking slurry can reach more than 60% (ISO).But the multisection type bleaching can cause production cost too high and be difficult to use, and also can cause the fiber transparency to increase and the paper opacity is descended, and is difficult to satisfy low quantification requirement.Japanese documentation JP0457988 number, a kind of coated newsprint with good color printing performance is disclosed, on basic paper, be coated with last layer pigment and binding agent, the de inked pulp that base paper adopts 50% waste paper to make, under the supercharging condition, adopt surfactant, carry out deinking by stirring.In addition, also adopted 30% true qualities needle slurry and 20% change machine slurry to manufacture paper with pulp, with the coated newsprint paper of kaolin and amorphous pigment making coatings, whiteness reaches 62%.The primary wood pulp that this method is used reaches 50%, has consumed the forest reserves directly or indirectly and has produced black digestion liquid; In addition, also need be with special coating apparatus.
People are to cause after the low quantification that intensity, opacity and the deflection of paper descends in a technical problem that runs into aspect the low quantification of newsprint.For addressing the above problem, common way is to seek the bigger and higher slurry kind proportioning of opacity of intensity, or adds a small amount of calcium carbonate and talc filler, but causes intensity decreases thus and be difficult to obtain commercial Application.As for ultra-low quantitative (44-43g/m
2) newsprint, technical and all successful economically report is not arranged so far.
Main purpose of the present invention is intended to overcome above-mentioned the deficiencies in the prior art, and a kind of regenerated newsprint that improves microstructure is provided, and it can satisfy high whiteness and low quantitative requirement simultaneously." the high whiteness " that the present invention is alleged means that the whiteness of paper can be more than or equal to 58%; Alleged " quantitatively low ", what mean paper quantitatively can be less than or equal to 49g/m
2, said " microstructure " means at the annexation of observed fibre morphology, surface characteristics, fiber and fiber under light microscope or the electron microscope, the charges between the fiber etc.
Another object of the present invention provides a kind of method of making the regenerated newsprint of above-mentioned improvement microstructure fiber, does not need boiling and chemical bleaching, just can produce high whiteness and low quantitative regenerated newsprint.
According to the low quantitative regenerated newsprint of high whiteness provided by the invention, its microstructure is that deinking chemical slurry does that long fiber, deinking mechanical pulp or mechano-chemical pulp are made medium-length fibre and mineral superfine fibre is made the common network structure that constitutes of staple fibre, and described long fiber, described medium-length fibre and described mineral superfine fibre surface adhesion have the mineral superfine powder body of high whiteness, high opacity.
Described mineral superfine fibre can be selected wollastonite or natural calcium metasilicate fiber, and its draw ratio is more than or equal to 10, and the granularity of described mineral superfine powder body is less than or equal to 2 μ m.Described mineral superfine powder body can be made by at least a material that is selected from wollastonite, natural calcium metasilicate, kaolin, talcum, the crystallite hydromica.
Also can contain in this regenerated newsprint and be selected from calcite, gypsum, technical grade Al
2O
3The filler that at least a material in powder, barite and the titanium dioxide is made.
According to the manufacture method that the high whiteness of manufacturing provided by the invention is hanged down quantitative regenerated newsprint, comprise successively and carry out proportioning, deinking, removal impurity, flotation, washing, pull an oar and copy the paper step with the waste paper that contains medium-length fibre containing long stapled waste paper; With existing regenerated newsprint manufacture method difference, be after described making beating step, copy before the paper step, in paper pulp, added the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body, its main chemical compositions and percentage by weight are: SiO
240.15-52.23%, CaO 38.27-48.48%, Al
2O
31.69-2.48%, SO
31.88-2.51%, Cl
-0.07-0.345%.This pulp modifying material has the function of " physics bleaching ".
The preferred ingredient and the percentage by weight of this pulp modifying material are respectively: SiO
240.15-52.23%, TiO
20.45-2.00%, Al
2O
31.69-2.48%, Fe
2O
30.06-0.57%, FeO0.23-0.39%, MnO 0.09-1.0%, MgO 1.16-1.85%, CaO 38.27-48.48%, Na
2O 0.44-0.88%, K
2O 0.23-0.57%, P
2O
50.04-0.09%, ZnO 0.04-0.09%, BaSO
40.36-2.86%, SO
31.88-2.51%, Cl
-0.07-0.34%, igloss 2.07～4.06, main crystalline phase is a wollastonite.
The present invention also provides the above-mentioned manufacture method that contains the pulp modifying material of mineral superfine fibre and mineral superfine powder body, in turn include the following steps: (1) is crushed to wollastonite or natural calcium metasilicate below 325 orders, makes mineral superfine powder body≤325 orders of acquisition; (2) the fine mineral fiber that obtains and superfine powder are mixed by the weight ratio of 80-90% and 10-20% respectively and weigh; (3) sulfuric acid of the hydrochloric acid of 33% concentration and 98% concentration was made into mixed acid by weight 2: 1 and dilution is 2% of original content; (4) mixed acid after will diluting injects heatable acid-resistant container, and quantity is 4 times of step (1); (5) mixed powder of step (1) weighing is slowly poured in the container of containing diluted acid, stirred and form slurries, make the slurries insulation about 50 ℃ by heating, and keep stirring about 60 minutes, this moment, the pH value of slurries was between the 7.5-8.0; (6) slowly add the waterglass of raw material gross weight 3-10%, the pH value of slurries reached between the 9-10, if pH value can add a small amount of calcined soda for industry when not enough, make its with water in the calcium ion reaction, the generation afwillite; (7) add the slurries that step (6) obtains after the modified starch of raw material gross weight 1-3% being diluted to 5% concentration, stir and left standstill 1 hour after 20 minutes; (8) filtering stock to pH value between 7.5-8; (9) slurry that obtains is dewatered, then oven dry; Material after the oven dry is crushed to 1250 orders or thinner, and wherein the draw ratio of mineral superfine fibre is more than or equal to 10, and other mineral powder is less than or equal to 2 μ m.
Compare with conventional regeneration newsprint and manufacture method thereof, the present invention has following advantage:
(1) the regenerated newsprint main plant fiber that provides is a deinked waste paper, and the paper production process meets environmental protection requirement, not disafforestation, does not use dogstail, does not adopt boiling and bleaching process, does not discharge pollutants such as black liquor, hypochlorite in the production process;
(2) regenerated newsprint that provides has low quantitative and high opacity.The at present domestic only minority energy small lot trial production 46g/m of producer
2Low quantitative newsprint does not have 44-43g/m as yet
2The ultra-low quantitative newsprint emerge.Can cause that the opacity of paper sharply descends after the low quantification of newsprint, so opacity is to make low quantitative newsprint (＜46g/m
2) major obstacle.Regenerated newsprint provided by the invention, it quantitatively can be low to moderate 42.4-44.6g/m
2, quantitatively be lower than the A grade standard (45g/m that newsprint GB (GB1910-89) is stipulated
2), and opacity still can reach 93.7-96.7%, is higher than the A grade standard (90%) of newsprint GB (GB1910-89) regulation;
(3) the regenerated newsprint height that provides has whiteness more than or equal to 58%, is higher than the A grade standard (52%) of newsprint GB (GB1910-89) regulation;
(4) regenerated newsprint that provides has high strength, and its brisement reaches more than the 3200m, and tearability reaches 230mN, has reached the A grade standard (being respectively 3200m and 230mN) of newsprint GB (GB1910-89) regulation, can adapt to the requirement of high-speed press.
(5) can utilize ready-made newsprint production equipment, only need legacy equipment is carried out very limited technological transformation, in the deinking slurry, add 5-20% or more pulp modifying material provided by the invention, just can produce the low quantitative regenerated newsprint of high whiteness.
Below in conjunction with several embodiment and relevant accompanying drawing, describe the present invention in detail.Wherein:
Fig. 1 is an observed microstructure according to regenerated newsprint sample provided by the invention under electron microscope;
Fig. 2 also is an observed microstructure according to regenerated newsprint sample provided by the invention under electron microscope;
Fig. 3 is the process chart according to the manufacture method of regenerated newsprint provided by the invention;
Fig. 4 is the X ray diffracting spectrum according to a kind of preferred embodiment of the pulp modifying material of regenerated newsprint paper pulp provided by the invention;
Fig. 5 is the X ray diffracting spectrum according to regenerated newsprint ash content provided by the invention.
Studies show that, general regenerated newsprint is mainly fibrous by the groundwood pulp after the deinking, its mechanical strength, as fracture length and tearability etc., the physical property (tensile strength of single fiber), chemical property that depends on the fiber that constitutes paper be surface chemical property (adhesion between the fiber) and pile up characteristic (as the configuration of surface of the draw ratio of the length of fiber, diameter, fiber, fiber, the collocation mode etc. of bifurcated and brooming, long and short fiber whether) for how much especially.Paper of whiteness and opacity depend on whiteness and the refractive index that constitutes paper fibre.Because generally about 1.53, along with the raising of fiber bleached degree, its refractive index descends the refractive index of paper fiber, is contradiction so make the requirement itself of high whiteness low transparency and low weight paper.Add high index of refraction pigment (as TiO
2, refractive index 2.55) and can improve whiteness and opacity preferably, however TiO
2Very expensive, even a small amount of adding also can cause the regenerated newsprint cost too high, be difficult to obtain commercial Application; And general pigment, as kaolin, talcum and calcium carbonate, its refractive index only is about 1.6, and it is little to the whiteness and the opacity contribution that improve newsprint to add a small amount of this class material, and a large amount of interpolations can cause the regenerated newsprint mechanical strength low excessively, are difficult to satisfy instructions for use.
The present invention starts with from the microstructure of improving regenerated newsprint just, has solved the contradiction of the requirement existence of making high whiteness low transparency and low weight paper itself.Referring to attached Fig. 1 and 2, the electron microscope scanning photo of regenerated newsprint sample provided by the invention is shown respectively among the figure.The microstructure of tradition newsprint, normally by the network structure that constitutes through the wood pulp fibre of bleaching, and disperse has particles filled thing.The low quantitative regenerated newsprint of high whiteness provided by the invention is then different, can know from Fig. 1 and to find out, it is to make the mineral superfine fibre that long fiber, deinking recycled newsprint pulp do in moderate-length fiber and the above-mentioned pulp modifying material by the chemical pulp of deinking to make the network structure that staple fibre has constituted the paper newsprint jointly, so paper has higher mechanical strength.Can know from Fig. 2 and to find out that deinking slurry surface is coated with to echo to generate high whiteness, high opacity inorganic coating, also is distributed with high whiteness, high opacity inorganic mineral superfine fibre in addition in the paper.So regenerated newsprint of the present invention has high whiteness, low quantitative and sufficiently high mechanical strength simultaneously, has higher content of ashes (〉=5%).
Below describe a kind of embodiment of the manufacture method of the low quantitative regenerated newsprint of high whiteness of the present invention in detail, referring to process chart shown in Figure 3.
At first will contain long stapled waste paper and carry out proportioning with the waste paper that contains medium-length fibre.In this embodiment, adopt the disregard message paper (mechanical pulp) of 70-90% and the useless chemical pulp paper of 10-30% (as useless magazine paper, useless art paper, useless papers for books and periodicals etc.) to mix deinking, make the deinking slurry that reasonably long and short fiber collocation be arranged;
Carry out deinking then, for example use traditional deinking equipment,,, promote printing ink and other impurity and fiber separation by adding surfactant and alkali etc. through the high concentration pulping.By steps such as screening and centrifugations, foreign material such as folder that is mingled with in the removal paper pulp and staple.Adopt flotation and the mode that washing combines in this embodiment, the printing ink rate of sloughing is reached more than 90%, the deinking pulp brightness reaches more than 50%.Know because these technologies are the those of ordinary skill in relevant field, do not repeat them here.
Adopted among this embodiment institute's de-oiling China ink is concentrated the measure of doing harmless treatment, 70% washes is recycled, and has reduced the pulp washing water.
According to the manufacture method of regenerated newsprint of the present invention, the distinguishing feature of this embodiment be the making beating step after, copy the paper step before, in de inked pulp, added the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body.This pulp modifying material has following characteristics: (1) it by multiple natural minerals and artificial material formulated (its preparation method will be described in detail below), mainly form by silicate that is selected from calcium, aluminium, magnesium, titanium and oxide, do not contain radioactive element and poisonous element, do not produce harmful substance in making and the use.This material is made up of mineral superfine fibre and mineral superfine powder body, and wherein＜10 μ m person accounts for 80-90%, and＜2 μ m persons account for 10-20%, average whiteness 〉=80%, mean refractive index 〉=1.65.It can combine with the de inked pulp fiber is close, and a large amount of (5-20% or more) adds the newsprint of making behind the de inked pulp and still have sufficiently high mechanical strength; (2) draw ratio of mineral superfine fibre＞10 can substitute the key material (rather than " filler " between the fiber) that the short wood pulp fibre of part becomes paper, so the paper strength that forms descends not quite; The superfine powder of＜2 μ m is mainly in the form of sheets with lamellar, can be attached to deinking pulp fibres surface and form the thick inorganic coating of submicron order of a floor height whiteness, high opacity, so the deinking pulp fibres is had " physics bleaching " (having reduced the pressure that traditional chemical bleaching causes environment) and " opacification " effect.(3) this material can generate the inorganic big molecule minerals calcium aluminite of small amount of fibers shape (it is white to be called thin,tough silk on the paper industry) [3CaO.Al in the paper drying course
2O
3.3Ca (SO
4, Cl
2, CO3) .32H
2O], to increase the intensity of paper; (4) this material is mixing with paper pulp and is becoming in the paper process, can absorb objectionable impurities such as chlorion in the water, chloranion, heavy metal ion, can alleviate the influence of waste water to environment.
The main chemical compositions and the percentage by weight of the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body that adds in paper pulp in the foregoing description are: SiO
240.15-52.23%, CaO 38.27-48.48%, Al
2O
31.69-2.48%, SO
31.88-2.51%, Cl
-0.07-0.345%.
In a kind of preferred embodiment, component and percentage by weight that pulp modifying material contains are respectively: SiO
240.15-52.23%, TiO
20.45-2.00%, Al
2O
31.69-2.48%, Fe
2O
30.06-0.57%, FeO 0.23-0.39%, MnO 0.09-1.0%, MgO 1.16-1.85%, CaO38.27-48.48%, Na
2O 0.44-0.88%, K
2O 0.23-0.57%, P
2O
50.04-0.09%, ZnO0.04-0.09%, BaSO
40.36-2.86%, SO
31.88～2.51%, Cl
-0.07～0.34%, igloss 2.07～4.06%.
Describe in detail according to the pulp modifying material preparation method that contains mineral superfine fibre and mineral superfine powder body of the present invention below.
At first, relevant raw material, selectable percentage by weight and the effect of adopting in pulp modifying material thereof is described:
(1) wollastonite or natural calcium metasilicate: 65-85%, whiteness 〉=85%.In order to make superfine fibre or superfine sheet powder;
(2) kaolin: 1-5%, whiteness 〉=85%.In order to make the superfine sheet powder;
(3) talcum: 1-5%, whiteness 〉=85%.In order to make the superfine sheet powder;
(4) montmorillonite: 1-5%, whiteness 〉=85%.Play the inorganic bond effect;
(5) crystallite hydromica: 1-5%, whiteness 〉=85%.Make the superfine sheet powder;
(6) calcite: 1-5%, whiteness 〉=85%.Filler;
(7) diatomite: 1-5%, whiteness 〉=85%.Absorbing heavy metal ions in water is improved the oil suction China ink;
(8) modenite: 1-5%, whiteness 〉=85%.Absorbing heavy metal ions in water, acid group improve the oil suction China ink;
(9) gypsum: 1-5%, whiteness 〉=85%.The effect of entringite crystallization nucleation;
(10) active A l
2O
3: 1-3%, whiteness 〉=85%.Improve opacity;
(11) titanium dioxide: 0.5-2%, whiteness 〉=95%.Improve whiteness and opacity;
(12) barite: 0.5-3%, whiteness 〉=95%.Improve whiteness and opacity;
(13) entringite: 1-3%, whiteness 〉=85%.The effect of entringite crystallization nucleation;
(14) waterglass: 3-10%, modulus 2.2-2.5,41 ° of Be.Adjust pH value, with the afwillite coating of calcium ion reaction generation submicron order in the water;
(15) modified starch: 1-3% makes organic binder bond;
(16) hydrochloric acid: technical grade (33% concentration), 1-5%.Activation mineral powder surface;
(17) sulfuric acid: technical grade (98% concentration), 1-5%.Activation mineral powder surface.
(18) soda ash: technical grade (98% concentration), 1-5%.Adjust pH value.
A kind of embodiment according to the manufacture method of the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body of the present invention comprises the steps:
(1) wollastonite or natural calcium metasilicate are crushed to below 325 orders, make mineral superfine powder body≤325 orders of acquisition;
(2) the fine mineral fiber that obtains and superfine powder are mixed by the weight ratio of 80-90% and 10-20% respectively and weigh;
(3) sulfuric acid of the hydrochloric acid of 33% concentration and 98% concentration was made into mixed acid by weight 2: 1 and dilution is 2% of original content;
(4) mixed acid after will diluting injects heatable acid-resistant container, and quantity is 4 times of step (1) weighing;
(5) mixed powder of step (1) weighing is slowly poured in the container of containing diluted acid, stirred and form slurries, make the slurries insulation about 50 ℃ by heating, and keep stirring about 60 minutes, this moment, the pH value of slurries was between the 7.5-8.0;
(6) slowly add the waterglass of raw material gross weight 3-10%, the pH value of slurries reached between the 9-10, if pH value can add a small amount of calcined soda for industry when not enough, make its with water in the calcium ion reaction, the generation afwillite;
(7) add the slurries that step (6) obtains after the modified starch of raw material gross weight 1-3% being diluted to 5% concentration, stir and left standstill 1 hour after 20 minutes;
(8) filtering stock to pH value between 7.5-8;
(9) slurry that obtains is dewatered, then oven dry; Material after the oven dry is crushed to 1250 orders or thinner, and wherein the draw ratio of mineral superfine fibre is more than or equal to 10, and other mineral powder is less than or equal to 2 μ m.
Second kind of embodiment according to the manufacture method of the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body of the present invention comprises the steps:
(1) with wollastonite or natural calcium metasilicate by 65-85%, be selected from kaolin, talcum, montmorillonite, crystallite hydromica, calcite, diatomite, modenite, gypsum, active A l
2O
3, at least a mineral in the titanium dioxide, barite, entringite mix by the weight ratio of 15-35% and weigh, and are crushed to 1250 orders, wherein the draw ratio of mineral superfine fibre 〉=10;
(2) sulfuric acid of the hydrochloric acid of 33% concentration and 98% concentration was made into mixed acid by weight 2: 1 and dilution is 2% of original content;
(3) mixed acid after will diluting injects heatable acid-resistant container, and quantity is 4 times of step (1);
(4) mixed powder of step (1) weighing is slowly poured in the container of containing diluted acid, stirred and form slurries, make the slurries insulation about 50 ℃ by heating, and keep stirring about 60 minutes, this moment, the pH value of slurries was between the 7.5-8.0;
(5) slowly add the waterglass of raw material gross weight 3-10%, the pH value of slurries reached between the 9-10, if pH value can add a small amount of calcined soda for industry when not enough, make its with water in the calcium ion reaction, the generation afwillite;
(6) add the slurries that step (6) obtains after the modified starch of raw material gross weight 1-3% being diluted to 5% concentration, stir and left standstill 1 hour after 20 minutes;
(7) filtering stock to pH value between 7.5-8;
(8) mashing pump after will washing is delivered to dosing chamber, mixes the back online with paper pulp and copies paper.
A kind of preferred embodiment according to the manufacture method of the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body of the present invention comprises the steps:
(1) wollastonite or natural calcium metasilicate being pressed 80-90%, kaolin presses 1-5%, talcum and presses 1-5%, montmorillonite and press 1-5%, crystallite hydromica and press 1-5%, calcite and press 1-5%, diatomite and press that 1-5%, modenite press 1-5%, gypsum is pressed 1-5%, active A l
2O
3Mix by the weight ratio of 1-3% by 0.5-3%, entringite by 0.5-2%, barite and weigh by 1-3%, titanium dioxide, be crushed to 1250 orders, wherein the draw ratio of mineral superfine fibre 〉=10;
(2) sulfuric acid of the hydrochloric acid of 33% concentration and 98% concentration was made into mixed acid by weight 2: 1 and dilution is 2% of original content;
(3) mixed acid after will diluting injects heatable acid-resistant container, and quantity is 4 times of step (1);
(4) mixed powder of step (1) weighing is slowly poured in the container of containing diluted acid, stirred and form slurries, make the slurries insulation about 50 ℃ by heating, and keep stirring about 60 minutes, this moment, the pH value of slurries was between the 7.5-8.0;
(5) slowly add the waterglass of raw material gross weight 3-10%, the pH value of slurries reached between the 9-10, if pH value can add a small amount of calcined soda for industry when not enough, make its with water in the calcium ion reaction, the generation afwillite;
(6) add the slurries that step (6) obtains after the modified starch of raw material gross weight 1-3% being diluted to 5% concentration, stir and left standstill 1 hour after 20 minutes;
(7) filtering stock to pH value between 7.5-8;
(8) mashing pump after will washing is delivered to dosing chamber, mixes the back online with paper pulp and copies paper.
The pulp modifying material that contains mineral superfine fibre and mineral superfine powder body according to the above preferred embodiment acquisition, and, be listed in the table 1 in detail: ash content chemical composition (%) in pulp modifying material and the paper in the low quantitative regenerated newsprint of the high whiteness of table 1 with the chemical composition that the high whiteness that this pulp modifying material is made is hanged down quantitative regenerated newsprint ash content
| Chemical composition | Constant interval % | |
| Pulp modifying material | Ash content in the paper | |
| SiO 2 | 40.15-52.23 | 40.28-53.14 |
| TiO 2 | 0.45-2.00 | 0.34-2.18 |
| Al 2O 3 | 1.69-2.48 | 1.76-2.53 |
| Fe 2O 3 | 0.06-0.57 | 0.08-0.62 |
| FeO | 0.23-0.39 | 0.29-0.45 |
| MnO | 0.09-0.10 | 0.10-0.12 |
| MgO | 1.16-1.85 | 1.32-2.05 |
| CaO | 38.27-48.48 | 39.46-49.98 |
| Na 2O | 0.44-0.88 | 0.40-0.90 |
| K 2O | 0.23-0.57 | 0.32-0.67 |
| P 2O 5 | 0.04-0.09 | 0.05-0.10 |
| ZnO | 0.04-0.09 | 0.05-0.09 |
| BaSO 4 | 0.36-2.86 | 0.38-2.98 |
| SO 3 | 1.88-2.51 | 1.12-2.87 |
| Cl - | 0.07-0.34 | 0.10-0.45 |
| Igloss | 2.07-4.06 | 1.20-2.06 |
Referring to Fig. 4, according to the X ray diffracting spectrum that contains the pulp modifying material of mineral superfine fibre and mineral superfine powder body in the low quantitative regenerated newsprint of high whiteness provided by the invention, prove that its main crystalline phase is a wollastonite shown in the figure.
Referring to Fig. 5, according to the X ray diffracting spectrum of ash content in the low quantitative regenerated newsprint of high whiteness provided by the invention, prove that equally its main crystalline phase is a wollastonite shown in the figure.
High whiteness of the present invention is hanged down quantitative regenerated newsprint lab scale scraps of paper performance indications (contrast newsprint GB GB1910-89) and is listed in the table 2: the low quantitative regenerated newsprint lab scale scraps of paper performance of table 2 high whiteness of the present invention and the GB GB1910-89 table of comparisons
| Index name | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Newsprint A level | Newsprint B level | Newsprint Bs level | Newsprint Cs level |
| Quantitative (g/m 2) | 44.3 | 42.4 | 44.3 | 44.6 | 45±2 | 49±2 | 49±2 | 51±2 |
| Breaking length (m) | 3210 | 3210 | 3490 | 3590 | 3200 | 2900 | 2700/1 900 | 2500/17 00 |
| Tearability (mN) | 230 | 235 | 223 | 230 | 230 | 200 | 200 | - |
| Smoothness (s) | 40 | 35 | 42 | 38 | 40 | 40 | 25 | 20 |
| Whiteness (%) | 61.5 | 59.4 | 60.6 | 58.8 | 52 | 50 | 45 | 40 |
| Opacity (%) | 96.7 | 95.6 | 96.7 | 93.7 | ＞90 | ＞90 | - | - |
| Dirt count is (individual/m 2)0.5- 4mm | 78 | 80 | 86 | 92 | 72 | 100 | 140 | 200 |
| Moisture (%) | 7.56 | 8.02 | 7.48 | 7.29 | 6-10 | 6-10 | 6-10 | 6-10 |
| Folding strength (inferior) | 15 | 14 | 23 | 22 | - | - | - | - |
| Degree of sizing (mm) | 0.5 | 0.5 | 0.5 | 0.5 | - | - | - | - |
| Ash content (%) | 18.02 | 17.25 | 17.67 | 18.67 | - | - | - | - |
Industrial performance test of the present invention carries out in an existing Newsprint Mill, and test lasts 10 days.Test has utilized this factory's deinking equipment to prepare newsprint deinking slurry, after high concentration pulping, desanding, floatation and ink removing (the floatation and ink removing slag is as producing other materials or going into the stove burning), washing, get slurry only, adopt one 360 mill circulation making beating, beating consistency is 3.0-3.3%, beating degree is 45-50 ° of SR, at the pulp modifying material of joining stock tank adding 10-20%.Utilize the 1575mm twin-tub paper machine of this factory to copy about 10 tons of paper.The waste water compliance with environmental protection requirements of discharging in the production after tested.The performance indications of six samples that obtain (contrast newsprint GB GB1910-89) are listed in the following table 3.The regenerated newsprint performance indications of the present invention that table 3 industrial performance test is made (contrast newsprint GB GB1910-89)
| Index name | Newsprint GB A level | Newsprint GB B level | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Sample 6 |
| Quantitative (g/m 2) | 45±2 | 49±2 | 46.5 | 46.3 | 43.4 | 41.2 | 45.8 | 46.2 |
| Breaking length (m) | 3200 | 2900 | 3660 | 3450 | 3250 | 3210 | 3260 | 3320 |
| Tearability (mN) | 230 | 200 | 295 | 330 | 280 | 250 | 280 | 340 |
| Smoothness (s) | 40 | 40 | 58.5 | 60.1 | 67.2 | 39.9 | 43.6 | 39.2 |
| Whiteness (%) | 52 | 50 | 56.7 | 61.5 | 65.1 | 66.3 | 65.9 | 67.7 |
| Opacity (%) | ＞90 | ＞90 | 92.9 | 92.3 | 90.9 | 90.2 | 92.4 | 91.3 |
| Dirt count is (individual/m 2)0.5- 4mm | 72 | 100 | 76 | 80 | 86 | 92 | 74 | 85 |
| Moisture (%) | 6-10 | 6-10 | 9.33 | 8.81 | 8.54 | 8.16 | 7.95 | 7.73 |
| Folding strength (inferior) | - | - | 8 | 4 | 10 | 16 | 8 | 3 |
| Degree of sizing (mm) | - | - | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
| Ash content (%) | - | - | 8.67 | 11.54 | 9.80 | 14.87 | 15.35 | 21.75 |
Can know from table 2 and 3 and to find out: the regenerated newsprint of lab scale manufacturing of the present invention quantitatively can be low to moderate 42.4-44.6g/m
2, be lower than the A grade standard (45g/m that newsprint GB (GB1910-89) is stipulated
2), and opacity still can reach 93.7-96.7%, is higher than the A grade standard (90%) of newsprint GB (GB1910-89) regulation; Whiteness is higher than the A grade standard (52%) of newsprint GB (GB1910-89) regulation more than or equal to 58%; Brisement reaches more than the 3200m, and tearability reaches 230mN, has reached the A grade standard (being respectively 3200m and 230mN) of newsprint GB (GB1910-89) regulation.Above-mentioned test shows that every performance indications of the low quantitative regenerated newsprint of high whiteness provided by the invention all meet or exceed newsprint GB (GB1910-89) A level.Wherein the printability contrast test of No. 5 samples on high-speed press shows, compares (51g/m with traditional newsprint
2), the newsprint of trial production is quantitatively low, color is white, the oil suction performance of ink is good, and writing, the picture of printing are clear, any print through phenomenon do not occur and fall hair and fall grey phenomenon, can adapt to the requirement of high-speed press.
Above-mentioned several embodiment is only for the usefulness that the present invention is described; and be not to be limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; for example; the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body provided by the invention; be used for the pulping process before paper is copied in conventional papermaking; can produce identical effect equally; therefore all technical schemes that are equal to also should belong to category of the present invention, and scope of patent protection of the present invention should be limited by each claim.
Claims (11)
1, the low quantitative regenerated newsprint of a kind of high whiteness, it is characterized in that: the microstructure of this regenerated newsprint is that the deinking chemical slurry is made long fiber, deinking mechanical pulp or mechano-chemical pulp is made medium-length fibre and mineral superfine fibre is made staple fibre, the common network structure that constitutes, described long fiber, described medium-length fibre and described mineral superfine fibre surface adhesion have the mineral superfine powder body of high whiteness, high opacity.
2, regenerated newsprint according to claim 1 is characterized in that: described mineral superfine fibre is wollastonite or natural calcium metasilicate fiber.
3, regenerated newsprint according to claim 1 and 2 is characterized in that: the draw ratio of described mineral superfine fibre is more than or equal to 10, and the granularity of described mineral superfine powder body is less than or equal to 2 μ m.
4, regenerated newsprint according to claim 1 and 2 is characterized in that: described mineral superfine powder body is made by at least a material that is selected from wollastonite, natural calcium metasilicate, kaolin, talcum, the crystallite hydromica.
5, regenerated newsprint according to claim 4 is characterized in that: also contain and be selected from calcite, gypsum, technical grade Al
2O
3The filler that at least a material in powder, barite and the titanium dioxide is made.
6, regenerated newsprint according to claim 5 is characterized in that: the ash content of paper is less than or equal to 50% more than or equal to 5%, and its chemical composition and percentage by weight are SiO
240.28-53.14%, TiO
20.34-2.18%, Al
2O
31.76-2.53%, Fe
2O
30.08-0.62%, FeO 0.29-0.45%, MnO 0.10-0.12%, MgO 1.32-2.05%, CaO 39.46-49.98%, Na
2O 0.40-0.90%, K
2O 0.32-0.67%, P
2O
50.05～0.10%, ZnO0.05-0.09%, BaSO
40.38-2.98%, SO
31.12-2.87%, Cl
-0.10-0.45%, main crystalline phase is a wollastonite.
7, newsprint according to claim 1 and 2 is characterized in that: its whiteness is between 52-68%, and it is quantitatively between 43-51g/m
2Between.
8, the manufacture method of the described regenerated newsprint of claim 1, comprise successively and carry out proportioning, deinking, removal impurity, flotation, washing, pull an oar and copy the paper step with the waste paper that contains medium-length fibre containing long stapled waste paper, it is characterized in that: the making beating step after, copy the paper step before, add the pulp modifying material that contains mineral superfine fibre and mineral superfine powder body in paper pulp, the chemical composition of described pulp modifying material and percentage by weight are:
SiO
2 40.15-52.23％，CaO 38.27-48.48％，Al
2O
3 1.69-2.48％，SO
31.88-2.51％，Cl
- 0.07-0.345％。
9, the manufacture method of regenerated newsprint according to claim 8 is characterized in that: the chemical composition of described pulp modifying material and percentage by weight are:
SiO
240.15-52.23%, TiO
20.45-2.00%, Al
2O
31.69-2.48%, Fe
2O
30.06-0.57%, FeO 0.23-0.39%, MnO 0.09-1.0%, MgO 1.16-1.85%, CaO38.27-48.48%, Na
2O 0.44-0.88%, K
2O 0.23-0.57%, P
2O
50.04-0.09%, ZnO 0.04-0.09%, BaSO
40.36-2.86%, SO
31.88-2.51%, Cl
-0.07-0.34%, igloss 2.07-4.06%.
10, according to Claim 8 or the manufacture method of 9 described regenerated newsprints, it is characterized in that: the proportioning that the step that the described waste paper that will contain long stapled waste paper and contain medium-length fibre carries out proportioning adopts is the useless mechanical pulp paper of 70-90% and the useless chemical pulp paper of 10-30%.
11, the manufacture method of regenerated newsprint according to claim 10 is characterized in that: described flotation step comprises the printing ink that recovery floatingly selects, and described washing step comprises that waste water is handled the back to be utilized once more in the deinking operation.
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| CN1079463C true CN1079463C (en) | 2002-02-20 |
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| CN100398746C (en) * | 2002-03-22 | 2008-07-02 | 加讯发展有限公司 | Padding combination as well as its preparing method and usage |
| CN103508686B (en) * | 2012-06-21 | 2015-12-02 | 金东纸业（江苏）股份有限公司 | Modified mineral fiber and preparation method thereof, applies the slurry of this modified mineral fiber |
| FI20126026L (en) * | 2012-10-02 | 2014-04-03 | Teknologian Tutkimuskeskus Vtt Oy | Filler for the production of paper and cardboard |
| CN105714604B (en) * | 2016-04-13 | 2018-03-02 | 陕西科技大学 | A kind of method for improving calcium silicates and being filled with paper performance |
| CN106865524B (en) * | 2017-03-20 | 2019-05-24 | 西安理工大学 | A kind of method that waste paper fibre prepares sulfur-bearing carbon microspheres |
| CN108221425B (en) * | 2017-12-29 | 2019-10-22 | 杭州德飙新能源科技有限公司 | A method of regenerated newsprint is prepared using old newsprint |
| CN108894047A (en) * | 2018-07-11 | 2018-11-27 | 合肥同佑电子科技有限公司 | A kind of printing paper preparation method with moisture-proof function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109534A (en) * | 1994-03-31 | 1995-10-04 | 吉林造纸厂 | Process for producing newsprint from birch CTMP |
| CN1167854A (en) * | 1997-03-28 | 1997-12-17 | 贵州省三穗县伟力造纸厂 | Method for producing regenerated newsprint using waste paper |
-
2000
- 2000-01-31 CN CN00100435A patent/CN1079463C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109534A (en) * | 1994-03-31 | 1995-10-04 | 吉林造纸厂 | Process for producing newsprint from birch CTMP |
| CN1167854A (en) * | 1997-03-28 | 1997-12-17 | 贵州省三穗县伟力造纸厂 | Method for producing regenerated newsprint using waste paper |
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