CN103334335A - Preparation method of pollution-free high-whiteness palm silk paper pulp and application of paper pulp in paper product - Google Patents
Preparation method of pollution-free high-whiteness palm silk paper pulp and application of paper pulp in paper product Download PDFInfo
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Abstract
The invention relates to a preparation method of pollution-free high-whiteness palm silk paper pulp and an application of the paper pulp in a paper product. The preparation method mainly comprises the steps that a palm silk raw material is cooked and bleached, and the obtained paper pulp is used for making the paper product. Cooking adopts a sulfate method, and paper pulp bleaching adopts a pollution-free (Total Chlorine Free-TCF) section procedure bleaching technology. Each section in an OPAP1P2 bleaching procedure adopts a medium-concentrated bleaching technique (a concentration of each section of paper pulp is 10-15%), so that the bleaching reaction efficiency can be improved, energy sources can be saved (heating the paper pulp), and the water consumption can be reduced. The bleaching does not require any chlorine (chlorine, pypocholoride or chlorine dioxide), so that bleaching waste water can be used for preparation of a cooking liquid and washing of unbleached pulp, and then enters an alkali recovery system, and the preparation method can save water and energy, reduce environmental pollution and allow resources to be fully used. With the adoption of the bleaching technology, the pollution-free high-whiteness (82-85% of ISO (Isobutanol)) paper pulp can be prepared, can substitute bleaching hardwood pulp, and is matched with bleaching sulfate softwood pulp for making advanced cultural paper as well as paper and cardboards with high hygienic index requirements.
Description
Technical field
The invention belongs to the pulp and paper technology field, relate to palm silk paper technology, especially a kind of is that raw material is made pollution-free high whiteness paper pulp and adopted this pulp production high culture technology of paper and the demanding paper of sanitary index and cardboard with the palm silk.
Background technology
China's paper industry development and national economy and social development are closely related, and expanding economy will provide strong support for China's paper industry development.The output of China's paper in 2011 and cardboard is 9,930 ten thousand tons, and consumption figure is 9,752 ten thousand tons, and the production and consumption amount is the No. 1 in the world.China's paper industry still is in the development rise period during " 12 ", and consumption per head was 73 kilograms in 2011.But we also should see simultaneously, and China's paper industry faces the problem of shortage of resources and environmental protection pressure increase.China's foreign paper in 2011 and cardboard, paper pulp, waste paper and paper products add up to 4,521 ten thousand tons, use foreign currency 239.54 hundred million dollars.China is former raw pulp and waste paper importation state the biggest in the world, and the supply of world's fibrous raw material and price will influence the development of China's paper industry to a great extent, ensures that conscientiously the fibrous raw material supply is the key that China's paper industry grows continuously and fast.Therefore, it is integrated to actively push forward woods paper, improves the domestic waste paper rate of recovery and the scientific and reasonable non-wood-fiber that utilizes, and strives increasing substantially the self-supporting level of fibrous raw material, is the urgent task that China's paper industry development faces.
Palm mainly is distributed in the length and breadth of land area of 37 ° of north and south latitudes, for example Malaysia in Southeast Asia, Indonesia and Thailand; Nigeria and the Cote d'lvoire in Africa; Central and South America taxi driver brother rival Asia, also there is plantation in provinces such as the Guangdong of China, Guangxi, Fujian and Hainan.The palm silk is the discarded object after oil palm is really extracted oil, and has that raw material is concentrated relatively, heteroproteose cell is less, parenchymal tissue content is less relatively, fiber content is relatively than characteristics such as height, only has at present on a small quantity for the production of true qualities wrapping paper and the product for civilian use.The palm silk mainly is used as garbage disposal, is used as fertilizer after the burning, and this not only wastes resource, and environment is caused severe contamination.Therefore, rationally utilize the monkey grass resource to carry out papermaking, not only help to solve China's paper industry fibrous raw material problem of shortage, and can increase farmers' income, take full advantage of resource, reduce environmental pollution, promote the industrial or agricultural sustainable development.
Environmental pollution is another key factor of restriction China paper industry development.The waste water of paper industry and COD discharge capacity occupy first of the every profession and trade, are mainly derived from the cooking waste liquor of small-sized non-wood pulping factory, have received country and the common people's very big concern in the last few years.By closing small paper mill, merger and reorganization, change products and start measures such as alkali recovery and Waste Water Treatment, pollution level is obviously reduced.Yet for a long time, the bleaching waste liquor that of light color and COD is low and waste water do not come into one's own to the influence of environment.Strict and popular raising to the health problem degree of concern day by day along with environmental regulation, the pollution problem of bleaching effluent has received very big concern, and the new papermaking industry development policy of putting into effect of country has been prohibited project begun newly and adopted elemental chlorine bleaching process (existing enterprise should progressively eliminate).At present, the many paper plants of China are also utilizing the bleaching of hypochlorite and chlorine, have only minority paper plant to use ClO 2 bleaching.Chloride particularly chlorine and hypochlorite bleaching can produce a large amount of AOX(and can absorb organic halogen), comprising the very strong De bioxin of toxicity, the cooking waste liquor that the bio-toxicity of these materials is dark far above color and COD is high causes environment and person health to have a strong impact on.
Patent and Indexing of Scien. and Tech. Literature result:
About utilizing the technical method of palm silk pulping and paper-making, existing people declares patent, and the patented power of people is also arranged, and the bibliographical information of this respect is arranged.By retrieval, disclosed patent documentation is: it is raw material that the patent of publication number (CN02145021.8) relates to oil palm shell string fiber, adopts no soda acid thermophilic digestion, spurts expanded mode and prepare paper pulp; The patent application of application number CN200510050391.9 and CN200510060736.9, relating to the hollow palm fruit string fiber is that raw material adopts continuously cooking and carries out hypochlorite bleaching as required and prepares paper pulp; The patent application of application number CN200510034091.1 and CN200510018735.8 relates to and adopts blasting procedure to prepare monkey grass paper pulp; The patent application of application number CN200910021404.8 and CN200910021484.7, relating to the oil palm empty fruit string fiber is raw material manufacturing machine slurry and chemi-mechanical pulp.Relate to the pulping process part in the above-mentioned 4 class patented technologies or do not add chemicals, or only add caustic soda; Prior difference is all not adopt total chlorine free bleaching in the above-mentioned 4 class technology.
The result for retrieval of scientific and technical literature is: thesis topic is the document of " palm silk The feasibility study of pulping and papermaking " (being published in " Chinese papermaking " 2006 25 the 1st phases of volume), has studied the hypochlorite single stage bleaching technology of palm wire chemical slurry; Thesis topic is single hop oxygen bleaching and the bleaching of single hop calcium hypochlorite that the document of " performance evaluation of palm silk pulping and paper-making " (being published in " Hubei papermaking " the 1st phase in 2008) and " evaluation of palm silk pulpability " (being published in " Hunan papermaking " the 4th phase in 2006) has been studied palm wire chemical slurry respectively, floats the back pulp brightness and is respectively 75%ISO and 78%ISO.Thesis topic is that the document of " research of palm leaf-stem fibre pulping and paper-making " (be published in " Chinese papermaking " 2008 27 volume the 3rd phase) has been introduced with the palm leaf-stem fibre to be feedstock production semi-chemical pulp technology, to be used for joining copying fluting medium.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, at resource and the environmental problem that paper industry exists, proposing a kind of is that raw material adopts pollution-free (completely without chlorine) bleaching process to produce high whiteness paper pulp and utilizes this pulp production high culture usefulness paper and to the method for the demanding paper of sanitary index and cardboard with the palm silk.
The objective of the invention is to be achieved through the following technical solutions:
A kind of preparation method of pollution-free high whiteness palm silk paper slurry comprises the preparation of group unbleached chemical pulp screened stock and the preparation of high whiteness paper pulp, and the preparation process of described group unbleached chemical pulp screened stock is:
With air-dry palm silk after broken end and impurity are removed in dedusting and screening, the boiling vessel of packing into;
⑵ adopt kraft cooking to above-mentioned palm silk raw material, and following process conditions are adopted in this boiling:
Sodium hydroxide concentration: 15%-25%;
Amount of sodium sulfide: 2%-5%;
Liquor ratio: 4-7:1;
Boiling temperature: 150 ℃-175 ℃;
Temperature retention time: 50 minutes-120 minutes
Above-mentioned consumption is the mass percent of over dry tablet;
Described liquor ratio is to comprise that total liquid measure of tablet moisture is to the mass ratio of over dry tablet;
⑶ the yield of paper pulp is 40%-50% after the boiling, and the paper pulp after the boiling is washed, screens and purifies, and obtains the group unbleached chemical pulp screened stock, and its kappa number for pulps is 8-20;
The preparation of described high whiteness paper pulp:
Adopt O
PAP
1P
2The short-range order bleaching comprises O
POxygen delignification section, A section-acid treatment section, P that section-a small amount of hydrogen peroxide is strengthened
1Section-hydrogen peroxide bleaching section, P
2Section-hydrogen peroxide bleaching section, the process conditions of each section bleaching are respectively:
O
PSection
Oxygen pressure: 0.3-0.6MPa
H
2O
2Consumption: 0.5%-1.5%
NaOH consumption: 2%-4%
Na
2SiO
3Consumption: 0.5%-2%
MgSO
4Consumption: 0.05%-0.2%
Pulp density: 10%-15%
Bleaching temperature: 100 ℃-130 ℃
Temperature retention time: 50 minutes-120 minutes
The A section
PH value: 1.5-2.5
Temperature: 30 ℃-60 ℃
Time: 20 minutes-40 minutes
Pulp density: 10%-15%
P
1Section
H
2O
2Consumption: 3%-6%
NaOH consumption: 1%-4%
Na
2SiO
3Consumption: 0.5%-2%
MgSO
4Consumption: 0.05%-0.2%
Pulp density: 10%-15%
Bleaching temperature: 70 ℃-90 ℃
Temperature retention time: 50 minutes-120 minutes
P
2Section
H
2O
2Consumption: 2%-5%
NaOH consumption: 1%-4%
Na
2SiO
3Consumption: 0.5%-2%
MgSO
4Consumption: 0.05%-0.2%
Pulp density: 10%-15%
Bleaching temperature: 70 ℃-90 ℃
Temperature retention time: 50 minutes-120 minutes
More than each section bleaching chemical consumption be chemicals over dry do not floated pulp quality percentage;
Through above-mentioned O
PAP
1P
2The palm silk bleached pulp of bleaching schedule and process conditions bleaching does not contain any chlorine, and whiteness is at 82-85%ISO, and viscosity is higher than 650ml/g, and its pulp strength is: fracture length 3.5-5.0km; Tear index 5.5-8.0mN.m
2/ g.
And described boiling vessel is rotary spherical digester, upright pot or transverse tube continuous steamer.
And, at O
PThe over dry of Duan Tianjia does not float pulp quality percentage to be the hydrogen peroxide of 0.5%-1.5% and to adopt 100 ℃-130 ℃ high temperature to promote delignification and to improve pulp brightness.
And, at P
1Section and P
2Duan Caiyong normal pressure hydrogen peroxide bleaching further promotes the raising with pulp brightness of removing of residual lignin.
And, described O
P, A, P
1And P
2Each section all adopts pulp density 10%-15% to bleach.
A kind of pollution-free high whiteness palm silk paper is starched the application at paper products: production high culture paper and the demanding paper of sanitary index and cardboard.
Advantage of the present invention and good effect are:
1, the discarded object after the present invention really extracts oil with oil palm---palm silk is that raw material is made pollution-free high whiteness paper pulp, the raw material reserves are abundant and concentrated relatively, use its pulping and paper-making, not only help to solve China's paper fibre shortage of resources problem, and can increase farmers' income, reduce environmental pollution.
2, bleaching process of the present invention adopts free of contamination O
PAP
1P
2Completely without the chlorine short-range order, overcome existing total chlorine free bleaching produce high whiteness association with pulp bleaching hop count more and bring paper pulp loss big, can high, a series of problems such as equipment investment is big, operating cost is high, pollutional load is heavy, production cost height of water consumption consumption, wherein:
⑴ O
PAP
1P
2First section oxygen delignification (O that adopts hydrogen peroxide to strengthen of bleaching
P), O
PThe bleaching temperature (100 ℃～130 ℃) that Duan Caiyong is higher is conducive to removing of lignin, and the Kappa value of palm silk brown stock can be reduced to 2～5 by 8～20, has reduced by 70%～80%;
⑵ O
PAP
1P
2Second section of bleaching is adopted acid treatment (A), adopt acid (sulfuric acid etc.) to handle and to remove the multiple metal ion that comprises alkaline-earth metal, and can degrade and remove in the paper pulp some band look organic substance, for example acid soluble lignin, some low subband look hemicellulose, hexenuronic acid, LCC etc. of dividing.Through not only pulp brightness raising of acid treatment, and the yellow hue of paper pulp is eliminated;
⑶ O
PAP
1P
2The 3rd section and the 4th section of bleaching is adopted the normal pressure hydrogen peroxide bleaching, adopts two sections normal pressure hydrogen peroxide bleachings, can make the whiteness of palm silk sulfate pulp reach 82～85%ISO, and viscosity is 650ml/g, more than the fracture length 4.0km;
⑷ O
PAP
1P
2Each section of bleaching all adopts medium consistency bleaching, and medium consistency bleaching can improve bleaching action efficient, reduces and floats agent consumption, and energy-saving and water-saving improves pulp brightness and reduces production costs.
3, bleaching effluent of the present invention does not contain AOX, can be used for the washing of brown stock, enter chemical recovery system thus, there are not noxious material in the paper pulp of producing, paper and cardboard, the whiteness of bleached pulp reaches 82～85%ISO, utilize the palm silk to prepare the substitute that chemical pulp can be used as the bleaching broad-leaved wood sulphate pulp, thereby reduce the consumption of timber and wood pulp, reduce production cost.The laboratory paper machine experiment shows, utilize high whiteness palm wire chemical slurry to be equipped with products such as can the production performance good writing paper of 10%～40% bleaching softwood kraft pulp, electro-photographic paper, the whiteness of the paper of copying can reach more than the 88%ISO, be respectively 5.1km and 2.6km to fracture length in length and breadth, be respectively 10.5mN.m to tear index in length and breadth
2/ g and 7.6mN.m
2/ g.Utilizing this pollution-free high whiteness palm wire chemical slurry can be equipped with bleaching needle-point leaf pulp manufactures paper with pulp various to the demanding paper of sanitary index and cardboard.
The specific embodiment
Below by specific embodiment the present invention is described in further detail.Need to prove that present embodiment is descriptive, is not determinate, can not limit protection scope of the present invention with this.
A kind of preparation method of pollution-free high whiteness palm silk paper slurry, step is:
⑴ remove dust, particle and impurity with the palm silk in the laboratory, the volume of packing into is that 15 liters electrical heating is rotated in the digester, adopts the sulfate process of caustic soda and vulcanized sodium to carry out boiling by the process conditions in the table 1.
⑵ after boiling finishes, extruding black liquor, the residual alkali in the assay determination black liquor and black liquor physico-chemical property.Paper pulp after the boiling is washed, measure unscreened yield.
(sieve seam 0.25mm) screens paper pulp with the laboratory flat screen, measures screened yield, screening reject rate and kappa number for pulps.
Boiling the results are shown in table 1.
Process conditions and the result of the boiling of table 1 palm silk
Annotate: 1. the boiling drug dosage is the boiling medicine to the mass percent of over dry palm silk;
2. liquor ratio is to comprise total liquid measure of raw material moisture and the mass ratio of over dry palm silk;
3. the boiling heating-up time is 80 minutes.
The palm silk brown stock screened stock that boiling obtains is bleached, adopted pollution-free (completely without chlorine) O
PAP
1P
2The program blanching step is:
⑴ the brown stock that boiling obtains carries out the oxygen delignification (O that a small amount of hydrogen peroxide is strengthened
P)
Float adding palm silk brown stock screened stock in the pot at 15 liters of electrical heating rotation oxygen, add bleaching chemical, stir, cover pot cover, aerating oxygen carries out oxygen delignification by the process conditions that table 2 is listed.
Oxygen delignification washs paper pulp after finishing, and measures Kappa value, viscosity and the paper pulp yield of paper pulp, and measurement result sees Table 2.
Table 2O
PSegment process condition and result
Annotate: O
PSection chemicals consumption is chemicals to the mass percent of over dry palm wire chemical slurry.
To above-mentioned through O
PThe paper pulp that section is handled carries out acid treatment (A)
With O
PThe paper pulp that section is handled is loaded in the plastic bag, adds sulfuric acid, rubs evenly, and the sealing plastic bag is inserted in the water-bath, according to the listed process conditions of table 3 paper pulp is carried out acid treatment.Acid treatment is washed paper pulp after finishing.
Table 3 acid treatment (A section) process conditions
⑶ the above-mentioned paper pulp of handling through the A section carries out two sections normal pressure hydrogen peroxide bleachings
Paper pulp after the A section handled is packed in the plastic bag, adds bleaching chemical, stirs, and the sealing plastic bag is inserted in the water-bath, carries out P respectively by the process conditions that table 4 is listed
1And P
2Bleaching.After two sections bleachings finish, all need paper pulp is washed, measure whiteness and the viscosity of gained paper pulp, measurement result sees Table 4.
Table 4P
1And P
2Sectional bleaching process condition and result
Annotate: the bleaching chemical consumption is bleaching chemical to the mass percent of absolute dried paper pulp.
⑷ measure through above-mentioned O
PAP
1P
2The physical property of the palm silk paper slurry of bleaching
To above-mentioned through O
PAP
1P
2The palm silk paper slurry of bleaching is pulled an oar, and copies into lodicule then, measures physical property.Laboratory standard beating equipment PFI mill, beating degree 45 are adopted in making beating
0SR.Copy lodicule and adopt laboratory page former, the mensuration of paper pulp physical property is carried out according to Chinese Industrial Standards (CIS), and measurement result is listed in table 5.
Table 5 is through O
PAP
1P
2The physical property of the pollution-free high whiteness palm silk paper slurry of bleaching
A kind of pollution-free high whiteness palm silk paper is starched the application at paper products:
1, to through O
PAP
1P
2The pollution-free high whiteness palm silk paper slurry of bleaching is copied paper.
Selection is through O
PAP
1P
2The palm silk paper slurry of bleaching.At first it is pulled an oar to beating degree 35 by standard method with the PFI mill
0SR, the bleaching softwood kraft pulp of adapted also pull an oar to beating degree 35 through the PFI mill
0SR.By palm silk slurry and the different proportionings of the wood pulp handmade paper of manufacturing paper with pulp, copy paper employing laboratory page former.It is as follows to copy the used additive of paper and consumption:
Filler CaCO
3: 20%
Brightening agent: 0.05%
Reinforcing agent cationic starch: 1%
Sizing agent AKD:0.2%
Retention and drainage aid agent cationic polyacrylamide: 0.03%
Copy paper and list in table 6 with the ratio of palm silk slurry and wood pulp.By the physical property of Chinese Industrial Standards (CIS) method mensuration handmade paper, it the results are shown in table 6.
Table 6 is through O
PAP
1P
2The physical property of the palm silk slurry handmade paper of bleaching
2, select through O
PAP
1P
2The pollution-free high whiteness palm wire chemical slurry of bleaching is manufactured paper with pulp high whiteness high culture with paper (bond paper and copy paper) at laboratory paper machine.Palm wire chemical slurry and bleaching softwood kraft pulp laboratory Valle
yBeater is pulled an oar respectively to beating degree 35
0SR carries out papermaking by 80% and 20% fibre furnish then, and used additive and consumption thereof are as follows:
Filler CaCO
3: 20%
Brightening agent: 0.05%
Reinforcing agent cationic starch: 1%
Sizing agent AKD:0.2%
Retention and drainage aid agent cationic polyacrylamide: 0.03%
By the physical property of the Chinese Industrial Standards (CIS) method mensuration paper of copying, it the results are shown in table 7.
The physical property of the machine-made paper that table 7 experiment paper machine is produced detects
Claims (6)
1. the preparation method of a pollution-free high whiteness palm silk paper slurry comprises the preparation of group unbleached chemical pulp screened stock and the preparation of high whiteness paper pulp, it is characterized in that:
The preparation process of described group unbleached chemical pulp screened stock is:
With air-dry palm silk after broken end and impurity are removed in dedusting and screening, the boiling vessel of packing into;
⑵ adopt kraft cooking to above-mentioned palm silk raw material, and following process conditions are adopted in this boiling:
Sodium hydroxide concentration: 15%-25%;
Amount of sodium sulfide: 2%-5%;
Liquor ratio: 4-7:1;
Boiling temperature: 150 ℃-175 ℃;
Temperature retention time: 50 minutes-120 minutes
Above-mentioned consumption is the mass percent of over dry tablet;
Described liquor ratio is to comprise that total liquid measure of tablet moisture is to the mass ratio of over dry tablet;
⑶ the yield of paper pulp is 40%-50% after the boiling, and the paper pulp after the boiling is washed, screens and purifies, and obtains the group unbleached chemical pulp screened stock, and its kappa number for pulps is 8-20;
The preparation of described high whiteness paper pulp:
Adopt O
PAP
1P
2The short-range order bleaching comprises O
POxygen delignification section, A section-acid treatment section, P that section-a small amount of hydrogen peroxide is strengthened
1Section-hydrogen peroxide bleaching section, P
2Section-hydrogen peroxide bleaching section, the process conditions of each section bleaching are respectively:
O
PSection
Oxygen pressure: 0.3-0.6MPa
H
2O
2Consumption: 0.5%-1.5%
NaOH consumption: 2%-4%
Na
2SiO
3Consumption: 0.5%-2%
M
gSO
4Consumption: 0.05%-0.2%
Pulp density: 10%-15%
Bleaching temperature: 100 ℃-130 ℃
Temperature retention time: 50 minutes-120 minutes
The A section
PH value: 1.5-2.5
Temperature: 30 ℃-60 ℃
Time: 20 minutes-40 minutes
Pulp density: 10%-15%
P
1Section
H
2O
2Consumption: 3%-6%
NaOH consumption: 1%-4%
Na
2SiO
3Consumption: 0.5%-2%
MgSO
4Consumption: 0.05%-0.2%
Pulp density: 10%-15%
Bleaching temperature: 70 ℃-90 ℃
Temperature retention time: 50 minutes-120 minutes
P
2Section
H
2O
2Consumption: 2%-5%
NaOH consumption: 1%-4%
Na
2SiO
3Consumption: 0.5%-2%
MgSO
4Consumption: 0.05%-0.2%
Pulp density: 10%-15%
Bleaching temperature: 70 ℃-90 ℃
Temperature retention time: 50 minutes-120 minutes
More than each section bleaching chemical consumption be chemicals over dry do not floated pulp quality percentage;
Through above-mentioned O
PAP
1P
2The palm silk bleached pulp of bleaching schedule and process conditions bleaching does not contain any chlorine, and whiteness is at 82-85%ISO, and viscosity is higher than 650ml/g, and its pulp strength is: fracture length 3.5-5.0km; Tear index 5.5-8.0mN.m
2/ g.
2. the preparation method of a kind of pollution-free high whiteness palm silk paper slurry according to claim 1, it is characterized in that: described boiling vessel is rotary spherical digester, upright pot or transverse tube continuous steamer.
3. the preparation method of a kind of pollution-free high whiteness palm silk paper slurry according to claim 1 is characterized in that: at O
PThe over dry of Duan Tianjia does not float pulp quality percentage to be the hydrogen peroxide of 0.5%-1.5% and to adopt 100 ℃-130 ℃ high temperature to promote delignification and to improve pulp brightness.
4. the preparation method of a kind of pollution-free high whiteness palm silk paper slurry according to claim 1 is characterized in that: at P
1Section and P
2Duan Caiyong normal pressure hydrogen peroxide bleaching further promotes the raising with pulp brightness of removing of residual lignin.
5. the preparation method of a kind of pollution-free high whiteness palm silk paper slurry according to claim 1 is characterized in that: described O
P, A, P
1And P
2Each section all adopts pulp density 10%-15% to bleach.
6. a pollution-free high whiteness palm silk paper slurry as claimed in claim 1 is characterized in that in the application of paper products: the production high culture is with paper and the demanding paper of sanitary index and cardboard.
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| CN107190552A (en) * | 2017-07-15 | 2017-09-22 | 齐永怡 | The method for manufacturing paper using wheat straw and bagasse |
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| CN112813713A (en) * | 2021-01-07 | 2021-05-18 | 杭州融凯盛科技有限公司 | Preparation method of special pulp for producing lyocell fibers from bamboo willows |
| CN113026409A (en) * | 2021-03-29 | 2021-06-25 | 边静 | Method for preparing biological sulfur-free semi-chemical pulp by using palm fibers |
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| CN104711881A (en) * | 2015-02-12 | 2015-06-17 | 新疆国力源环保科技有限公司 | Salix psammophila bleached chemi-mechanical pulp technology |
| CN107190552A (en) * | 2017-07-15 | 2017-09-22 | 齐永怡 | The method for manufacturing paper using wheat straw and bagasse |
| CN110761104A (en) * | 2019-10-08 | 2020-02-07 | 中国宣纸股份有限公司 | Chlorine-free bleaching method for Chinese art paper sandalwood pulp |
| CN112813713A (en) * | 2021-01-07 | 2021-05-18 | 杭州融凯盛科技有限公司 | Preparation method of special pulp for producing lyocell fibers from bamboo willows |
| CN112813713B (en) * | 2021-01-07 | 2022-12-27 | 山东鸿泰鼎新材料科技有限公司 | Preparation method of special pulp for producing lyocell fibers from bamboo willows |
| CN113026409A (en) * | 2021-03-29 | 2021-06-25 | 边静 | Method for preparing biological sulfur-free semi-chemical pulp by using palm fibers |
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