CN105625076A - Environment-friendly unbleached paper - Google Patents
Environment-friendly unbleached paper Download PDFInfo
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- CN105625076A CN105625076A CN201610171074.0A CN201610171074A CN105625076A CN 105625076 A CN105625076 A CN 105625076A CN 201610171074 A CN201610171074 A CN 201610171074A CN 105625076 A CN105625076 A CN 105625076A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
- D21C3/024—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes with NH3 or H2O
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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Abstract
The invention provides a piece of environment-friendly unbleached paper which is prepared from a cellulose product as a raw material, wherein the cellulose product is obtained after medium cellulose, hemicellulase and lignin in a grass plant material are separated; the cellulose product has the following properties: the concentration of cellulose based on the total weight of the cellulose product is 28.63%; the K value of the cellulose product is less than 5.5; the beating degree of the cellulose product is 20-30 degree SR; the wet weight of the cellulose product is 2-3.5; the whiteness of the cellulose product is less than 44.5 degrees; the pH value of the cellulose product is 7-9. Compared with a similar product, the environment-friendly unbleached paper provided by the invention is relatively high in cellulose content and is relatively excellent in appearance characteristic. In addition, as the environment-friendly unbleached paper provided by the invention is free of chemical medicines and is not bleached, no residue can be produced, and no harm can be done to human bodies.
Description
Technical field
The present invention relates to biomass as resources high-efficiency comprehensive utilization field, specifically relate to this coloured paper of environment-friendly type that the cellulose prods utilizing three element separation to obtain manufactures.
Background technology
As the raw material mainly vegetable fibre of papermaking. Mainly adopt softwood tree or deciduous tree timber in developed country, account for more than the 95% of total consumption. The plant fiber material kind used in China is then relatively many, comprises (1) wood of coniferous tree, such as tamarack, Korean pine, Pinus massoniana Lamb, pinus yunnanensis, pinus sylvestris var. mongolica etc.; (2) deciduous tree timber, such as Yang Mu, birch, eucalyptus wood etc.; (3) herbaceous plant, such as reed, bamboo, awns stalk, wheat straw, straw, Herba Poae Sphondylodis, sorghum stalk, bagasse etc.; (4) phloem fiber class, such as flax, jute, mestha, wingceltis bark, mulberry skin, cotton stalk skin etc.; (5) hair fibre class, such as cotton, linters, cotton rag. From raw material sources angle, it may also be useful to such as above-mentioned (3) herbaceous plant cost is lower and wide material sources. But, comparing with (2) class raw material with above-mentioned (1), it may also be useful to other materials, the paper fibre content that particularly above-mentioned (3) class raw material is obtained is lower, show as in appearance slack and undisciplined, intensity is low, quality is uneven, even has irregular holes. On the other hand, along with the raising of living standards of the people and quality, commercially human consumer tends to select the paper for daily use of 100% wood pulp more.
These problems of the paper using above-mentioned (3) class raw material obtained to solve, usually carry out embossing at present and process to hoodwink people. In addition, in order to improve feel, add talcum powder and make its too satiny or use time often have dust releasing. In addition, carry out undue bleaching to improve whiteness, make color too in vain or have stain. But, these methods can not fundamentally solve the problem particularly brought as draft class raw material.
Summary of the invention
The present inventor is in biomass as resources comprehensive utilization, particularly three element separation fields of biomass resource have carried out long-term research, contriver finds to obtain Mierocrystalline cellulose, hemicellulose and lignin product after herbaceous plant carries out three element separation as raw material, in the cellulose prods wherein obtained, content of cellulose improves, and xylogen and half fibre content reduce. The quality of paper can be improved using this cellulose prods as paper making raw material, improve outward appearance. This completes the present invention.
An aspect of of the present present invention provides a kind of this coloured paper of environment-friendly type, it obtains by raw material of the cellulose prods that obtains by herbaceous plant material, wherein said cellulose prods has following character: the concentration based on the gross weight Mierocrystalline cellulose of described cellulose prods is 28.63%, K value is less than 5.5, beating degree is 20-30 �� of SR, weight in wet base is 2-3.5g, and whiteness is less than 44.5 ��, and pH value is 7-9; Wherein, described coloured paper does not comprise bleach.
In a certain embodiment, described cellulose prods is obtained by following step:
The herbaceous plant material of collection is carried out pre-treatment, then flash trapping stage device is sent into by handling equipment, with the steam boiling 1min-5min of 0.6MPa-3.0MPa, after boiling, carry out multistage cleaning again, then carry out solid-liquid separation and obtain hemicellulose liquid and solid substance;
Add alkaline solution to described solid substance, the boiling 0.5h-1.5h when 90 DEG C-130 DEG C, after boiling, carry out the cellulose prods that two solid-liquid separation obtain solid-state form.
Preferably, the alkaline solution described in cellulose prods preparation process is selected from least one of the group being made up of aqueous sodium hydroxide solution, potassium hydroxide aqueous solution, calcium hydroxide aqueous solution, ammoniacal liquor and sodium bicarbonate aqueous solution. Can selection of land, the addition of the alkaline solution described in cellulose prods preparation process counts 4%-10% based on the total mass of described solid substance with the weight of alkali.
In a certain embodiment, described herbaceous plant material be selected from the group of the root of plant, stalk, leaf and kind shell composition one of at least.
Can selection of land, described herbaceous plant material be selected from the group that is made up of cornstalk, wheat-straw, barley-straw, cereal stalk, reed, flax stem, weeds, cereal shell, wheat chaff, beans stalk, cotton stalk and potato class seedling one of at least.
In a certain embodiment, this coloured paper of environment-friendly type is for taking out paper or coil paper. It is preferably dining table paper.
When using non-wood type paper pulp of the present invention to carry out slurrying, owing to the hemicellulose in herbaceous plant being separated by cellulose prods, the structure of remaining Mierocrystalline cellulose and xylogen is also discongested out, therefore, it may also be useful to the amount of pharmaceutical chemicals is reduced to 5% to 8% by the 12%-18% of tradition slurrying. It is even possible that do not use any pharmaceutical chemicals. In addition, comparing with temperature (135 DEG C-150 DEG C) with the vapor pressure (0.5-0.7MPa) during tradition slurrying, when utilizing the non-wood type paper pulp of the present invention to carry out slurrying, temperature and vapor pressure also reduce.
The invention belongs to the comprehensive utilization of biomass as resources, when making full use of xylogen, the hemicellulose of plant resources, the high-content cellulose prods obtained is used for papermaking, it is to increase the content of cellulose of paper and external appearance characteristic. In addition, the paper of the present invention is not because adding chemical agent, it does not have through bleaching, therefore noresidue, it may also be useful to human body is not injured by time; Owing to selecting slurry to derive from the Mierocrystalline cellulose in biomass three element product separation, supplementing of the organic fertilizer that product prepared by this Mierocrystalline cellulose can be directly used in urban afforestation, seeds of flowering plants grass is planted by family.
Alkaline solution is added to described solid substance, boiling 0.5h��3h when 90 DEG C��130 DEG C, the cellulose prods that two solid-liquid separation obtain solid-state form is carried out after boiling, tradition paper-making pulping does not need first to be separated hemicellulose, but directly by raw material by adding acid or alkali, carrying out boiling, general boiling temperature is: 150-170 DEG C, cooking time was at 1.5-2.5 hour. The raw material of vapor pressure after 0.6MPa-0.8MPa. boiling is through art breading such as washing, screening, bleachings, obtain paper pulp, the hemicellulose, the xylogen that produce in the process treatment process such as washing, screening, bleaching are blended in water body, form more difficult pulp-making waste-water.
Accompanying drawing explanation
Fig. 1 is the schematic explanation figure of tradition three grades of tripping devices.
Embodiment
Now each exemplary of the present invention being described in detail, embodiment accompanying drawing wherein is illustrated. It should be appreciated that following detailed explanation is not limitation of the invention, it is for reader provides, some aspect of the present invention and the details of feature are better understood on the contrary.
In the present invention, various scientific and technical terminology, noun, unit all have common implication in this area, unless separately explained. In addition, in the present invention, the definition of various parameter is as in paper industry as described in latest edition national standard, and they measure all according to latest national standards relevant in paper industry mensuration, unless separately explained. All kinds of unit of the present invention represent weight time with gram (g), unless separately explained.
In the present invention, biomass material (such as herbal various types of materials) can production of cellulose, hemicellulose and xylogen by three grades of isolation technique. Herein these three kinds of materials are generically and collectively referred to as " three elements ", the technology producing three elements by three grades of isolation technique are called " three element isolation technique ". Variant production is obtained respectively comprising by three separation means, and by variant production exploitation for the production of three elements.
Below with reference to exemplary accompanying drawing 1, three grades of separating steps are simply described.
Flash trapping stage step: the biomass material of collection is carried out pre-treatment, then flash trapping stage device is sent into by handling equipment, with the steam boiling 1min-5min of 0.6MPa-3.0MPa, carry out multistage cleaning after boiling again, then carry out solid-liquid separation and obtain hemicellulose liquid phase (the first liquid phase) and the first solid phase as solid substance;
The second-order separation step: in the total mass of above-mentioned solid substance, adds the alkaline solution of 4%-10% in solid substance, the boiling 0.5h-3h when 60 DEG C-130 DEG C, carries out two grades of solid-liquid separation and obtain the 2nd liquid phase and second solid phase after boiling;
Three grades of separating steps: undertaken the 2nd liquid phase precipitating, filter, activate, selected process, obtain the 3rd liquid phase and the 3rd solid phase, and wherein said 3rd liquid phase is biochemical lignin stoste.
In above-mentioned three grades of separation, the first liquid phase preferably can be further used for anaerobically fermenting and produces biogas or prepare furfural product. Second solid phase preferably can be further used for being processed into Mierocrystalline cellulose or its derived product, such as carboxymethyl cellulose product. Biochemical lignin stoste as the 3rd liquid phase preferably can concentrate through film device further, makes liquid biochemical lignin product, by liquid biochemical lignin product obtained solid-state biochemical lignin product after evaporation and drying. In addition, as the 3rd solid phase solid substance can preferably through precipitation, solid-liquid separation process after, for the preparation of such as biomass molding fuel product.
In the present invention, described " herbaceous plant " uses relative to xylophyta, refers to that xylem is undeveloped, a class plant of stem stalk softness. Xylophyta on the other side refers to that xylem is flourishing, hard, and plant is tall and big. The general plant of herbaceous plant is short and small, be divided into annual, more year is raw and perennial three classes. As herbaceous plant, it is preferable that include but not limited to all kinds of agricultural crops. Such as, wheat class, cereal, reed, flax class, corn, huge bacterium grass, Chinese sorghum, sunflower, weeds, edible mushrooms, beans, cotton or potato class etc. In addition, herbaceous plant material, comprises above-mentioned plant at least partially, such as at least one of the root of above-mentioned plant, stem leaf, flower etc. Extensive and the cost angle from raw material, it is preferable that plant stem material, such as various stalk, it is preferable that wheat stalk.
The term " cellulose prods " used in the present invention refers to the product of the rich cellulose composition produced in three element separation of herbaceous plant material. Obtain especially by following step: the herbaceous plant material of collection is carried out pre-treatment, then flash trapping stage device is sent into by handling equipment, with the steam boiling 1min-5min of 0.6MPa-3.0MPa, carry out multistage cleaning after boiling again, then carry out solid-liquid separation and obtain hemicellulose liquid and solid substance; Alkaline solution is added to described solid substance, the boiling 0.5h-1.5h when 90 DEG C-130 DEG C, the difference carrying out cellulose prods and tradition slurrying that two solid-liquid separation obtain solid-state form after boiling is: separated by the hemicellulose in herbaceous plant owing to the first step is separated, the structure of remaining Mierocrystalline cellulose and xylogen is also discongested out, therefore, the amount of pharmaceutical chemicals is used to reduce (tradition slurrying is at 12%-18%), the temperature used and vapor pressure reduce (traditional vapor power 5-7 kilogram, temperature 135 DEG C-150 DEG C).
Described cellulose prods preferably has following character: and have following character: based on described cellulose prods gross weight described in concentration 28.63%, the K value of Mierocrystalline cellulose be less than 5.5, beating degree is 20-30 �� of SR, weight in wet base 2-3.5g, whiteness is less than 44.5 ��, and pH value is 7-9, it is preferable that 8.07.
In traditional paper industry, the obtained paper pulp by raw material of simple herbaceous plant is generally containing xylogen, hemicellulose, and therefore paper pulp yield is at 30%-35%, and the content of Mierocrystalline cellulose is at 65%-80%. And the content of Mierocrystalline cellulose reaches 90%-97% in the cellulose prods obtained after being separated by three elements, therefore, the purity of paper pulp is higher. Described concentration is based on the total weight of described cellulose prods.
Owing to herbaceous plant contains a large amount of xylogen. Paper-making process needs take off as much as possible except these xylogen. Traditionally, carry out oxygen alkali drift being undertaken the thick slurry after boiling screening, in washing process, de-except part xylogen, thus obtain meeting the thin slurry of specification of quality. In the three element sepn processes of the present invention, remove hemicellulose by first time separation. The xylogen being contained in liquid phase is removed by second time separation. Therefore, the cellulose prods obtained has been removed hemicellulose and the xylogen of major part.
In addition, in tradition paper technology, need association with pulp bleaching, thus remove the coloring matter in paper pulp, or change chemical composition makes it decolouring, remove remaining part xylogen simultaneously further, to improve whiteness and the retention of whiteness of paper pulp, meet the requirement of paper or the high purity extractive slurrying produced. And in the present invention, owing to having been extracted respectively by the xylogen of the hemicellulose of more than 85% in raw material and more than 95% in cellulose prods, therefore, the content of cellulose in paper pulp is higher, product is purer.
The term " K value " used in the present invention, refers to the kappa value of paper pulp, and namely a certain amount of paper pulp is under specific acidic conditions, reacts certain time with a certain amount of potassium permanganate, and the paper obtained is converted into and is equivalent to the 50% potassium permanganate amount that consumes. The size of this numerical value reflects and remains in the number of lignin content and the relative content of other reducing substanceses in paper pulp after boiling, can indirectly represent the size of delignified pulp xylogen degree, thus the formulation of the evaluation to digesting technoloy and the bleaching process for paper pulp provides foundation. Its calculation formula is: K=pf/M, wherein:
The kappa value of K-paper pulp,
P-paper pulp consumes 0.02mol/L, KMnO4The amount mL of solution
The oven dry weight g of M-paper pulp
F-is equivalent to the modified value (see GB/T1546-2004) of 50% potassium permanganate consumption.
K value in the present invention is preferably less than 6, such as less than 5.9, less than 5.8, less than 5.7, less than 5.6, less than 5.5, it is particularly preferred to less than 5.4. Preferred K value is 5.32.
" beating degree " of the present invention, also referred to as " beating degree ", refers to that reaction paste is after paste roller mill, and fiber is cut off, divides, moistens the effect of the mill slurry effects such as swollen and aquation. Representing symbol is �� SR. The measurement of beating degree measures by method well known in the art. Such as, according to national standard: the assay method (Xiao Baier-Rui Gelefa) of GB/T3332-1982 slurry pulping degree measures. Beating degree in the present invention can be the scope of 20-30 �� of SR, such as 25-28 �� of SR, it is particularly preferred to 26.5 �� of SR.
" weight in wet base " of the present invention is secondary indication mean fibre length. More O-fiber mean length is more little for weight in wet base, and the more big mean fibre length of weight in wet base is more long. In the present invention, the measuring method of weight in wet base adopts framework method, the i.e. weight of fiber wet weight (g)=framework and fiber--frame weight
Mean fibre length (mm)=weight in wet base �� framework coefficient.
Weight in wet base in the present invention preferably within the scope of 2-3.5g, such as, 2.5g, 2.7g, 2.9g, 3.0g, it is preferable that 2.93g.
" whiteness " in the present invention is the aobvious white or bleaching degree of paper pulp, its essence is that paper pulp place all wavelengths is reflected uniform specular reflectance included by white light. In the present invention, expenditure represents. Whiteness whiteness instrument is measured. Such as measure according to GB/T8940.2-1988. The pulp brightness of the present invention is less than 45 ��, such as less than 44.9 ��, less than 44.7 ��, less than 44.5 ��, less than 44.3 ��, less than 44.1, even less than 44.0, it is preferable that be 44.13 ��.
In the present invention the papermaking described in method be then slurrying after fiber after grinding, sieve, wash, floating, form the paper pulp fiber being suspended in water, then be combined into the paper product of different size and purposes through adding the processing of various auxiliary chemical raw materials. The paper technology of the present invention, such as broken slurry and making beating, screening desanding purification are the technique usually adopted in this area, and its concrete steps or parameter can adapt to adjustment according to the object of the present invention.
In addition, it is necessary to explanation, in above-mentioned slurrying or paper technology, or can become in slurry to add the normally used additive in this area or auxiliary agent, such as tackiness agent, sweetener etc. to the paper pulp in each stage, thus reach different objects. Such as, but it should be noted that, the additive or the auxiliary agent that use in the method for the present invention do not comprise any reagent with bleaching function, hypochlorous acid, hydrogen peroxide etc.
Term of the present invention " separation ", refers to remove at least part of material from biomass material, such as, removes at least part of Mierocrystalline cellulose. Including, but not limited to filtering separation, precipitate and separate etc.
" pre-treatment " refers to change in some way the physical properties of biomass, such as, changes the length of biomass, the cutting and grinding process of size; Also comprise the chemical property changing biomass, such as, in degree of crystallinity, the polymerization degree, surface-area, change to hemicellulose and/or the combination of xylogen and the solubleness in specific solvent.
Three grades separation in use " alkaline solution " (also can be called " alkali lye ", " liquid caustic soda ") for this area in normally used alkaline liquid, be generally the aqueous solution of the oxyhydroxide of basic metal, such as, NaOH, KOH, Ca (OH)2Deng the aqueous solution, it is possible to comprise ammoniacal liquor, NaHCO3Deng the solution of alkaline matter common in this area. As alkali lye concentration based on solid substance weight in the weight of alkali be preferably 4%-10%, it is preferable that 6%-8%, it is also preferred that 6.5%-7.5%, it is most preferred that 7%.
In the present invention, " hemicellulose liquid " preferably refers to by with the steam boiling 1min-5min of 0.6MPa-3.0MPa, carries out multistage cleaning again and the organic liquid phase being rich in hemicellulose that obtains of solid-liquid separation after boiling. The pH value of the hemicellulose liquid phase thus obtained is usually less than 6.8. Such as, in some cases lower than 6.5, lower than 5.0 under particular case.
Embodiment
The preparation of this coloured paper of the present invention:
1. pulping process:
Using 50 tons of wheat stalks as raw material, this raw material is carried out dedusting, cutting and grinding pre-treatment, send in digester by handling equipment afterwards, it is about 5min with the steam boiling of about 2.0MPa, multistage cleaning is carried out with water again after boiling, and carry out solid-liquid separation by precipitation, the supernatant liquid containing hemicellulose is separated, and reclaims the solids component after lower floor's boiling.
Next, in the solids component after the boiling obtained, add the aqueous sodium hydroxide solution of 4%��10%, the boiling about 1 hour when about 100 DEG C, carry out after boiling washing, screen, the de-process of oxygen, reclaim lower floor's solid substance, be cellulose prods.
By analysis, cellulose prods obtained above about 13 tons, its every index is: concentration 28.63%, K value 5.32, beating degree 26.5 �� of SR, weight in wet base 2.93g, whiteness 44.13 ��, PH value 8.07.
2. paper technology:
Carry out papermaking using above-mentioned cellulose prods as raw material, concrete steps are as follows:
Above-mentioned cellulose prods is put into hydrapulpter, control broken slurry water, pH value is at 7.0-7.8, concentration is at 3%-5%, after broken solution is even, by slurry pump to dewatering net, 5%-7% is brought up to by dense for slurry, enter double disc refiner again to pull an oar, beating pressure controls at 0.15-0.25MPa, making beating current control is at 60A-90A, after making beating, pulp quality standard is: beating degree 40 ��-45 ��, weight in wet base 2.80g-3.2g, enter pressure sieve again and carry out closed screening, enter sand separator again and carry out desanding purification, slurry after purification enters slurry storage tank (copying front groove), one-tenth slurry is passed through header box successively, net portion is shaping, suction press is dewatered, dry, rewinding, after cutting, make coil paper.
Comparative example 1
It is purchased the obtained paper pulp of wheat stalk as raw material (Henan Hua Feng Paper Co., Ltd except using, wheat straw magma), and outside using hypochlorous acid that paper pulp is carried out bleaching, in the way of same as the previously described embodiments, carry out papermaking, obtain comparing and use coil paper.
Comparative example 2
Use the fresh breeze board log sterling paper prepared using wood materials purchased on market and sell as comparative example 2
Paper is evaluated
(1) water-absorbent evaluation
Often kind of a coil paper gets one section, clips together with ruler respectively, 0 scale of lower end aligned straightedge. Then paper and ruler are put into the water of empurple, wait water to overflow to 1cm place and fix good also timing one minute at once. Deng a minutes to time observe water inhaled high cm number. Same paper is tested three times by two groups of (often group 1 male 1 female respectively) people, takes the mean. Evaluation result is as shown in table 1 below.
(2) slickness evaluation
Often kind of a coil paper gets one section, lies in desktop. Put the hook code of 50 grams, hang on the hook of hook code for one jiao that digs each coil paper. Then take ergometer to be hooked on the hook of hook code slowly to draw, until writing down the reading of ergometer when coil paper and hook code move. Same paper is tested three times by two groups of (often group 1 male 1 female respectively) people, takes the mean. Evaluation result is as shown in table 1 below.
(3) intensity evaluation
Often kind of a coil paper gets one section, clamps up and down with clip, and the distance of two clips is 10cm. Clip above is hung on brandreth, and 50 grams of method codes hung by the clip in front, sees and can hang at most how many. Same paper is tested three times by two groups of (often group 1 male 1 female respectively) people, takes the mean. Evaluation result is as shown in table 1 below.
(4) whiteness evaluation
Often kind of a coil paper gets one section. Whiteness instrument (model: SBDY-1 1P) is used to measure under the same conditions. The coil paper of every type surveys three times, takes the mean. Evaluation result is as shown in table 1 below.
The paper of table 1. the present invention and the comparison comparing paper using
Contrasting from the data of table 1, the coil paper that the coil paper prepared by the method for the present invention is prepared with wood material in water-absorbent is suitable. In slickness and intensity, the coil paper that the method for the present invention obtains is more excellent. In addition, coil paper prepared by the inventive method is this coloured paper not carrying out bleaching, and its whiteness is significantly lower than the product of two comparative examples.
Although the present invention describes about exemplary, but the present invention is not limited to described disclosed exemplary. The scope of claim is consistent with the widest explanation to comprise all this type of improvement and equivalent structure and effect.
Claims (9)
1. this coloured paper of environment-friendly type, it obtains by raw material of the cellulose prods that obtains by herbaceous plant material, wherein said cellulose prods has following character: the concentration based on the gross weight Mierocrystalline cellulose of described cellulose prods is 28.63%, K value is less than 5.5, beating degree is 20-30 �� of SR, weight in wet base is 2-3.5g, and whiteness is less than 44.5 ��, and pH value is 7-9; Wherein, described coloured paper does not comprise bleach.
2. this coloured paper of environment-friendly type according to claim 1, wherein said cellulose prods is obtained by following step:
The herbaceous plant material of collection is carried out pre-treatment, then flash trapping stage device is sent into by handling equipment, with the steam boiling 1min-5min of 0.6MPa-3.0MPa, after boiling, carry out multistage cleaning again, then carry out solid-liquid separation and obtain hemicellulose liquid and solid substance;
Add alkaline solution to described solid substance, the boiling 0.5h-1.5h when 90 DEG C-130 DEG C, after boiling, carry out the cellulose prods that two solid-liquid separation obtain solid-state form.
3. this coloured paper of environment-friendly type according to claim 2, wherein the alkaline solution described in cellulose prods preparation process is selected from least one of the group being made up of aqueous sodium hydroxide solution, potassium hydroxide aqueous solution, calcium hydroxide aqueous solution, ammoniacal liquor and sodium bicarbonate aqueous solution.
4. this coloured paper of environment-friendly type according to Claims 2 or 3, wherein the addition of the alkaline solution described in cellulose prods preparation process counts 4%-10% based on the total mass of described solid substance with the weight of alkali.
5. this coloured paper of environment-friendly type according to the arbitrary item of Claims 1-4, wherein said herbaceous plant material be selected from the group of the root of plant, stalk, leaf and kind shell composition one of at least.
6. this coloured paper of environment-friendly type according to the arbitrary item of claim 1 to 5, wherein said herbaceous plant material be selected from the group that is made up of cornstalk, wheat-straw, barley-straw, cereal stalk, reed, flax stem, weeds, cereal shell, wheat chaff, beans stalk, cotton stalk and potato class seedling one of at least.
7. this coloured paper of environment-friendly type according to the arbitrary item of claim 1 to 6, it is for taking out paper or coil paper.
8. this coloured paper of environment-friendly type according to the arbitrary item of claim 1 to 7, it is dining table paper.
9. this coloured paper of environment-friendly type according to the arbitrary item of claim 1 to 8, it is paper for daily use.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108342924A (en) * | 2018-04-25 | 2018-07-31 | 刘洁 | The method of papermaking process and modified pulp |
| CN113249999A (en) * | 2021-05-24 | 2021-08-13 | 泰盛科技（集团）股份有限公司 | Preparation method of bamboo velvet pulp |
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| CN113249999A (en) * | 2021-05-24 | 2021-08-13 | 泰盛科技（集团）股份有限公司 | Preparation method of bamboo velvet pulp |
| CN113249999B (en) * | 2021-05-24 | 2022-09-09 | 泰盛科技（集团）股份有限公司 | Preparation method of bamboo velvet pulp |
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