CN111851106A - Preparation method of industrial hemp stalk paper pulp and application of industrial hemp stalk paper pulp in paper preparation - Google Patents
Preparation method of industrial hemp stalk paper pulp and application of industrial hemp stalk paper pulp in paper preparation Download PDFInfo
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- CN111851106A CN111851106A CN201910343338.XA CN201910343338A CN111851106A CN 111851106 A CN111851106 A CN 111851106A CN 201910343338 A CN201910343338 A CN 201910343338A CN 111851106 A CN111851106 A CN 111851106A
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Classifications
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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
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
-
- 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
Abstract
The application discloses a preparation method of industrial hemp stalk paper pulp and application thereof in paper preparation, wherein the preparation steps comprise: pretreating hemp stalks to obtain a precursor; carrying out enzymolysis treatment on the precursor to obtain coarse pulp; and grinding the coarse pulp to obtain the industrial hemp stalk pulp. The paper pulp prepared by the method can be made into various papers by adding auxiliary materials prepared from other papers, and particularly can be applied to cigarette paper to improve the air permeability and tensile strength of the cigarette paper. The method provided by the application reduces the discharge of waste water and waste gas, improves the pulp yield and the pulp whiteness, relieves the pressure of the traditional pulping method on the environment, and has important significance on energy conservation, emission reduction and low-carbon economy.
Description
Technical Field
The application relates to a preparation method of industrial hemp stalk paper pulp and application thereof in paper preparation, belonging to the technical field of paper pulp preparation.
Background
The hemp is a plant which is suitable for being widely planted in China, pesticides and herbicides are rarely applied to the hemp in the whole growth process, the fiber yield of the hemp in unit time and unit area is far higher than that of wood, bast fiber of the hemp is an excellent textile raw material, and hemp paper produced by adopting the hemp as the raw material is green and environment-friendly high-grade paper and can be widely applied to cigarette paper, tea bag paper, tobacco sheets, filter paper, bank notes, security paper, various high-grade packaging materials and the like.
In the existing patents, such as CN 102644211 and CN 102644212, chemical methods are adopted to pulp the whole stalks of industrial hemp, while the existence of hemp skin deepens the color of the pulp, various bleaching agents and decoloring agents are needed to be treated subsequently, and in addition, sulfate and strong alkali are added during pulping, the discharged waste liquid increases the environmental protection pressure.
Disclosure of Invention
According to one aspect of the present application, there is provided a method for preparing industrial hemp stalk pulp using a combination of bio-enzymatic and mechanical pulping to meet the need for industrial development of industrial hemp.
The preparation method of the industrial hemp stalk paper pulp is characterized by comprising the following steps:
pretreating hemp stalks to obtain a precursor;
carrying out enzymolysis treatment on the precursor to obtain coarse pulp;
and grinding the coarse pulp to obtain the industrial hemp stalk pulp.
Optionally, the enzymatic treatment is bio-enzyme catalysis;
the biological enzyme comprises at least one of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme.
Optionally, the biological enzyme is selected from at least one of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme.
Optionally, the biological enzyme is selected from at least two of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme.
Optionally, the biological enzyme is selected from at least three of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme.
Optionally, the biological enzyme is selected from at least four of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme.
Optionally, the enzymatic treatment is a biological enzyme catalytic treatment.
Optionally, the conditions of the enzymatic hydrolysis treatment are as follows: the dosage of the enzyme is 0.1-1% of the substance to be treated.
Optionally, the amount is 0.1-1% of the mass of the hemp stalk core.
Optionally, the enzyme is used in an amount such that the upper limit of the percentage of the mass of the substance to be treated is selected from 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9% or 1%; the lower limit is selected from 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8% or 0.9%.
Optionally, the conditions of the enzymatic hydrolysis treatment are as follows: treating for 1-5 h at 25-70 ℃, then heating to 100 ℃, and preserving heat for 3-8 min.
Optionally, the upper limit of the temperature of the enzymatic treatment is selected from 30 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃, 65 ℃ or 70 ℃; the lower limit is selected from 25 deg.C, 30 deg.C, 35 deg.C, 40 deg.C, 45 deg.C, 50 deg.C, 55 deg.C, 60 deg.C or 65 deg.C.
Optionally, the time upper limit of the enzymolysis treatment is selected from 1.5h, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h or 5 h; the lower limit is selected from 1h, 1.5h, 2h, 2.5h, 3h, 3.5h, 4h or 4.5 h.
Optionally, obtaining hemp stalk cores after said pre-treatment.
Optionally, the pre-treatment is: peeling to obtain hemp stalk core.
Optionally, the method for preparing the industrial hemp stalk pulp is a method for preparing industrial hemp stalk core pulp.
Optionally, the pre-processing comprises:
carrying out peeling treatment, cutting, soaking and swelling on the hemp full stalk;
the length of the cutting segment is 1 mm-10 mm.
Optionally, the hemp whole stalks are pre-treated to obtain hemp stalk cores.
Optionally, the upper length limit of the cut segment is selected from 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10 mm; the lower limit is selected from 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm or 9 mm.
Optionally, the soaking swelling is: adding 3-8 times of water for soaking and swelling.
Optionally, the upper limit of the volume multiple of water required for soaking and swelling is selected from 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5 or 8; the lower limit is selected from 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7 or 7.5.
And the soaking and swelling time is enough for swelling.
Optionally, the refining is mechanical refining.
Optionally, the refining mode is low consistency disc refining.
Optionally, the mechanical refining conditions are: the pulping concentration is 1 to 6 percent; the beating degree is less than or equal to 40 degrees SR.
Optionally, the beating degree is less than or equal to 30 DEG SR.
Optionally, the upper pulping concentration limit is selected from 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, or 6%; the lower limit is selected from 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or 5.5%.
Optionally, post-treatment is performed after the refining;
the post-treatment comprises bleaching.
Optionally, the bleaching agent employed in the bleaching process comprises hydrogen peroxide;
the bleaching conditions are as follows: the dosage of the bleaching agent is 10-30 wt% of the absolutely dry pulp to be treated; the treatment temperature is 70-90 ℃; the treatment time is 1-3 h.
Optionally, the bleaching agent is used in an amount (absolutely dry for the pulp to be treated) with an upper limit selected from 12 wt%, 15 wt%, 18 wt%, 20 wt%, 25 wt%, 28 wt% or 30 wt%; the lower limit is selected from 10 wt%, 12 wt%, 15 wt%, 18 wt%, 20 wt%, 25 wt% or 28 wt%.
Optionally, the upper limit of the treatment temperature during the bleaching process is selected from 72 ℃, 75 ℃, 80 ℃, 85 ℃, 88 ℃ or 90 ℃; the lower limit is selected from 70 deg.C, 72 deg.C, 75 deg.C, 80 deg.C, 85 deg.C or 88 deg.C.
Optionally, the upper limit of the treatment time in the bleaching process is selected from 1.2h, 1.5h, 1.8h, 2h, 2.5h or 3 h; the lower limit is selected from 1h, 1.2h, 1.5h, 1.8h, 2h or 2.5 h.
Optionally, the bleaching is followed by a post-dewatering treatment.
Optionally, the post-processing comprises: bleaching, purifying, concentrating and drying.
Optionally, the method comprises:
(1) peeling hemp stalks, cutting the hemp stalks into sections with the length of 1-10 mm, adding 3-8 times of water for soaking and swelling to obtain precursors;
(2) performing catalytic treatment on the precursor obtained in the step (1) by adopting a biological enzyme method to obtain coarse slurry;
the biological enzyme adopted by the biological enzyme method catalytic treatment is selected from at least one of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme;
(3) and (3) mechanically grinding the coarse pulp obtained in the step (2), bleaching, purifying, concentrating and drying to obtain the industrial hemp stalk paper pulp.
As a specific embodiment, the method comprises:
(1) peeling the hemp full stalk by a peeling machine, cutting the hemp full stalk into small sections with the length of 1-10 mm, adding 3-8 times of water for soaking and swelling, and removing part of non-fibrous impurities;
(2) catalytically treating the hemp stalk cores obtained in the step (1) by adopting a biological enzyme method; the enzyme preparation is one or a combination of more of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme, the dosage of the enzyme is 0.1-1% of the mass of the hemp stalk core, the reaction time is 1-5 h, the temperature is 25-70 ℃, the temperature is increased to 100 ℃ after the reaction is finished, and the temperature is kept for 3-8 min, so that coarse pulp is obtained;
(3) And (3) mechanically pulping the coarse pulp obtained in the step (2), controlling the pulping concentration to be 1% -6%, and controlling the pulping degree to be less than or equal to 40 DEG SR, and bleaching, purifying, concentrating and drying to obtain the industrial hemp stalk pulp.
Bleaching the unbleached pulp of the industrial hemp full stalk obtained in the step (3) by using hydrogen peroxide, wherein the usage amount of the unbleached pulp is 10-30% of the absolute dry amount of paper pulp, the treatment temperature is 70-90 ℃, and the treatment time is 1-3 h.
In another aspect of the present application, there is provided industrial hemp stalk pulp prepared by any one of the above methods.
Alternatively, the paper made by the method for preparing the industrial hemp stalk core pulp is made.
In a further aspect of the application, there is provided a method according to any one of the above, and the use of the industrial hemp stalk pulp described above in the preparation of paper.
Optionally, the paper is cigarette paper.
The beneficial effects that this application can produce include:
1) according to the method, the hemp husks are discarded, pulping is carried out by combining a biological enzyme method and a mechanical method, the color of the pulp is reduced, only hydrogen peroxide is used for decoloring, the investment of chemical reagents is greatly reduced, safety and environmental protection are facilitated, and the product yield is not reduced.
2) The bio-mechanical pulping method provided by the application reduces the discharge of waste water and waste gas, improves the pulp yield and the pulp whiteness, relieves the pressure of the traditional pulping method on the environment, and has important significance on energy conservation, emission reduction and low-carbon economy.
3) The cigarette paper prepared from the paper pulp prepared by the method has higher air permeability and tensile strength.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
The raw materials in the examples of the present application were all purchased commercially, unless otherwise specified. In the examples, the purchase sources of the biological enzymes are: lignin peroxidase and laccase were obtained from Pujing Kangli technology, Inc., Beijing, xylanase and pectinase were obtained from Shanghai Michelin Biotechnology, Inc., and pulping enzyme was obtained from Lv Weikang Biotechnology, Inc.
Example 1
A preparation method of industrial hemp stalk core paper pulp comprises the following steps:
(1) peeling the hemp full stalk by a peeling machine, cutting into small sections of 3mm, putting into a reaction tank, adding 3 times of water for soaking and swelling, and removing part of non-fibrous impurities to obtain hemp stalk cores;
(2) taking 10000 parts of the hemp stem core obtained in the step (1), uniformly mixing with 3 parts of lignin peroxidase, 2 parts of xylanase, 2 parts of laccase and 3 parts of pulping enzyme, performing enzymolysis, wherein the reaction time is 5 hours and the temperature is 25 ℃, raising the temperature to 100 ℃ after the reaction is finished, and keeping the temperature for 8min to obtain coarse pulp;
The parts are parts by weight;
(3) and (3) mechanically pulping the coarse pulp obtained in the step (2), controlling the pulping concentration to be 1%, controlling the pulping degree to be 30 DEG SR, adding hydrogen peroxide into the treated pulp according to the absolute dry 10 wt%, keeping the mixture at 70 ℃ for 3 hours, purifying, concentrating and drying the mixture to obtain the industrial hemp stalk pulp, wherein the pulp yield is 59%.
Example 2
A preparation method of industrial hemp stalk core paper pulp comprises the following steps:
(1) peeling the hemp full stalk by a peeling machine, cutting into 6mm small sections, putting into a reaction tank, adding 6 times of water for soaking and swelling, and removing part of non-fibrous impurities to obtain hemp stalk cores;
(2) taking 1000 parts of the hemp stalk core obtained in the step (1), uniformly mixing with 2 parts of lignin peroxidase, 2 parts of laccase, 1 part of pectinase and 2 parts of pulping enzyme, and then carrying out enzymolysis, wherein the reaction time is 1h and the temperature is 70 ℃, after the reaction is finished, the temperature is increased to 100 ℃, and the temperature is kept for 5min, so that coarse pulp is obtained;
the parts are parts by weight;
(3) and (3) mechanically pulping the coarse pulp obtained in the step (2), controlling the pulping concentration to be 3%, controlling the pulping degree to be 35 DEG SR, adding hydrogen peroxide into the treated pulp according to absolute dry 20 wt%, keeping the pulp at 80 ℃ for 2 hours, purifying, concentrating and drying to obtain the industrial hemp stalk pulp, wherein the pulp yield is 57%.
Example 3
A preparation method of industrial hemp stalk core paper pulp comprises the following steps:
(1) peeling the hemp full stalk by a peeling machine, cutting the hemp full stalk into small sections of 8mm, putting the small sections into a reaction tank, adding 8 times of water for soaking and swelling, and removing part of non-fibrous impurities to obtain hemp stalk cores;
(2) taking 1000 parts of the hemp stalk core obtained in the step (1), uniformly mixing with 2 parts of lignin peroxidase, 3 parts of laccase, 3 parts of xylanase and 2 parts of pulping enzyme, performing enzymolysis, wherein the reaction time is 3 hours and the temperature is 50 ℃, raising the temperature to 100 ℃ after the reaction is finished, and keeping the temperature for 3min to obtain coarse pulp;
the parts are parts by weight;
(3) and (3) mechanically pulping the coarse pulp obtained in the step (2), controlling the pulping concentration to be 6%, controlling the pulping degree to be 40 DEG SR, adding hydrogen peroxide into the treated pulp according to 30 wt% of absolute dry pulp, keeping the mixture at 90 ℃ for 1h, purifying, concentrating and drying the mixture to obtain the industrial hemp stalk pulp, wherein the pulp yield is 58%.
Comparative example 1 chemical mechanical pulping process
(1) Cutting the air-dried hemp stalks into small sections with the length of 10mm, putting the small sections into a retting pool for retting to remove part of pectin and non-fibrous impurities, and sending the hemp stalks into a cooking pot after dehydration;
(2) steaming hemp stalk by sulfate process; in particular, caustic soda with the weight of 18 percent of the hemp stalks and sodium sulfide with the weight of 3 percent of the hemp stalks are added with water to steam the hemp stalks; the liquor ratio during cooking is 1:3, and the temperature rise curve is as follows: the temperature rise time is 90min, the heat preservation time is 120min, and the highest temperature is 155 ℃; obtaining finished pulp after the cooking is finished;
(3) After the finished pulp is washed, the finished pulp enters a pulping unit which is a conical pulping unit, the pulping concentration is controlled to be 2 percent, the pulping degree is controlled to be 35 degrees SR, and the wet weight of the fiber is 5.0 g; after pulping, screening, purifying, dehydrating, washing, spirally extruding and concentrating to obtain the unbleached pulp of the industrial hemp full stalk, wherein the yield of paper pulp is 42 percent.
Example 4 cigarette paper preparation and Performance evaluation
The pulps prepared in examples 1 to 3 and comparative example 1 were used to prepare cigarette paper by the cigarette paper preparation method disclosed in chinese patent CN 102261011, and the prepared cigarette paper was subjected to physical property test.
The base permeability of the film was analyzed by 4110N permeability meter of gurley, Germany, F81838 tensile strength tester of Frank, Germany, and the basis weight of the paper was determined by ZDYQ-100 quantitative circular sampler of spring paper tester, Inc., and the smoldering rate was the time required for a continuous smoldering length of 150mm after ignition of a cigarette paper having a width of 15 mm.
The results are shown in table 1, and it can be seen from table 1 that the base sheet of the cigarette paper prepared from the paper pulp prepared by the method of the present invention has higher air permeability, lighter and thinner paper and better tensile strength.
TABLE 1 comparison of the physical Properties of the paper
The sheet-based air permeability in Table 1 is the ratio of air flow per unit surface area (volume per unit time) through the sample at different pressure differences, and is expressed in cm3/(cm2Min kPa), expressed in CU; basis weight is the weight per square meter of paper, in g/m2。
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A preparation method of industrial hemp stalk pulp is characterized by comprising the following steps:
pretreating hemp stalks to obtain a precursor;
carrying out enzymolysis treatment on the precursor to obtain coarse pulp;
and grinding the coarse pulp to obtain the hemp stalk pulp.
2. The method of claim 1, wherein the enzymatic treatment is bio-enzymatic;
the biological enzyme comprises at least one of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme;
Preferably, the conditions of the enzymatic treatment are as follows: the dosage of the enzyme is 0.1-1% of the substance to be treated.
3. The method according to claim 1, wherein the conditions of the enzymatic treatment are as follows: treating for 1-5 h at 25-70 ℃, then heating to 100 ℃, and preserving heat for 3-8 min.
4. The method of claim 1, wherein the pre-processing is: peeling to obtain hemp stalk core.
5. The method of claim 1, wherein the pre-processing comprises:
carrying out peeling treatment, cutting, soaking and swelling on the hemp full stalk;
the length of the cutting segment is 1 mm-10 mm;
preferably, the soaking swelling is as follows: adding 3-8 times of water for soaking and swelling.
6. The method according to claim 1, characterized in that the refining is mechanical refining;
preferably, the mechanical refining conditions are: the pulping concentration is 1 to 6 percent; the beating degree is less than or equal to 40 degrees SR.
7. The method according to claim 1, characterized in that the refining is followed by post-treatment;
the post-treatment comprises bleaching;
preferably, the bleaching agent employed in the bleaching process comprises hydrogen peroxide;
the bleaching conditions are as follows: the dosage of the bleaching agent is 10-30 wt% of the absolutely dry pulp to be treated; the treatment temperature is 70-90 ℃; the treatment time is 1-3 h.
8. The method according to claim 1, characterized in that it comprises:
(1) peeling hemp stalks, cutting the hemp stalks into sections with the length of 1-10 mm, adding 3-8 times of water for soaking and swelling to obtain precursors;
(2) performing catalytic treatment on the precursor obtained in the step (1) by adopting a biological enzyme method to obtain coarse slurry;
the biological enzyme adopted by the biological enzyme method catalytic treatment is selected from at least one of lignin peroxidase, xylanase, laccase, pectinase and pulping enzyme;
(3) and (3) mechanically grinding the coarse pulp obtained in the step (2), bleaching, purifying, concentrating and drying to obtain the hemp stalk paper pulp.
9. Industrial hemp stalk pulp produced by the method of any one of claims 1 to 8.
10. Use of the method of any one of claims 1 to 8, the industrial hemp stalk pulp of claim 9 in the preparation of paper;
preferably, the paper is cigarette paper.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910343338.XA CN111851106A (en) | 2019-04-26 | 2019-04-26 | Preparation method of industrial hemp stalk paper pulp and application of industrial hemp stalk paper pulp in paper preparation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910343338.XA CN111851106A (en) | 2019-04-26 | 2019-04-26 | Preparation method of industrial hemp stalk paper pulp and application of industrial hemp stalk paper pulp in paper preparation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116084210A (en) * | 2023-04-10 | 2023-05-09 | 内蒙古昆明卷烟有限责任公司 | Cigarette for improving sensory quality of cigarette, biological cigarette paper and preparation process |
| CN117166276A (en) * | 2023-09-05 | 2023-12-05 | 齐鲁工业大学(山东省科学院) | Method for preparing bio-mechanical pulp by treating kenaf with ternary eutectic solvent assisted biological enzyme |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1811055A (en) * | 2006-02-28 | 2006-08-02 | 华南理工大学 | Production process of bleached chemical pulp with hemp stalk core |
| CN102261011A (en) * | 2011-08-01 | 2011-11-30 | 云南聚恒科技有限公司 | Industrial hemp fiber cigarette paper |
| CN106368030A (en) * | 2016-09-19 | 2017-02-01 | 昆明理工大学 | Method for preparing food packaging paper through hemp core stalk total chloride-free bleached pulp |
| CN108442162A (en) * | 2018-04-16 | 2018-08-24 | 福建祥业环保科技股份有限公司 | Farm crop straw organism pulping process and paper making pulp |
-
2019
- 2019-04-26 CN CN201910343338.XA patent/CN111851106A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1811055A (en) * | 2006-02-28 | 2006-08-02 | 华南理工大学 | Production process of bleached chemical pulp with hemp stalk core |
| CN102261011A (en) * | 2011-08-01 | 2011-11-30 | 云南聚恒科技有限公司 | Industrial hemp fiber cigarette paper |
| CN106368030A (en) * | 2016-09-19 | 2017-02-01 | 昆明理工大学 | Method for preparing food packaging paper through hemp core stalk total chloride-free bleached pulp |
| CN108442162A (en) * | 2018-04-16 | 2018-08-24 | 福建祥业环保科技股份有限公司 | Farm crop straw organism pulping process and paper making pulp |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116084210A (en) * | 2023-04-10 | 2023-05-09 | 内蒙古昆明卷烟有限责任公司 | Cigarette for improving sensory quality of cigarette, biological cigarette paper and preparation process |
| CN117166276A (en) * | 2023-09-05 | 2023-12-05 | 齐鲁工业大学(山东省科学院) | Method for preparing bio-mechanical pulp by treating kenaf with ternary eutectic solvent assisted biological enzyme |
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