CN103757958B - Hemp dissolving pulp and preparation method - Google Patents
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Abstract
The invention discloses the hemp dissolving pulp that a kind of production craft step simplifies, hemp dissolving pulp quality index described in its feature is: methylcellulose >=93, lignin≤0.5, pectin≤0.5, irony≤20mg/, little dust≤1502/, big dust≤1.5/kg, the degree of polymerization 400～600, its preparation method is with fiber crops material as raw material, through cut off, grab cotton, alkaline boiling, pull an oar, bleach, prepared by step of manufacturing paper with pulp；Due to the fact that the chopped fiber after using griping cotton machine to cut off carries out remove impurity, loose, simplify processing step, meanwhile, use ferment treatment before alkaline boiling, improve boiling efficiency, decrease alkali consumption 20～30；The present invention makes full use of ramie spinning leftover bits and pieces and hemp dissolving pulp made by degummed ramie fiber leftover bits and pieces, the fibre count of the fiber that this pulp is made can reach 1.56～3dtex, the count of yarn made is greatly improved, also substantially increase ramie spinning leftover bits and pieces and the spinnability of degummed ramie fiber leftover bits and pieces, add the benefit of enterprise.
Description
Technical field
The present invention relates to field of chemical fiber production, specifically a kind of hemp dissolving pulp and preparation method, particularly relate to a kind of employing ramie spinning leftover bits and pieces or degummed ramie fiber leftover bits and pieces prepares hemp dissolving pulp and preparation method.
Background technology
Viscose rayon belongs to regenerated celulose fibre.It is with native cellulose as raw material, makes soluble cellulose sulphonic acid ester through operations such as alkalization, aging, sulfonation, is re-dissolved in sig water and makes viscose glue, make through wet spinning.Use different raw materials and spinning technique, different viscose rayons can be respectively obtained.
At present, viscose rayon has employing cotton linter, needlebush, leaf wood, bamboo wood etc. to produce for raw material.And owing to fiber crops material fabric is in addition to having than the more preferable sucting wet air permeability of common viscose fiber, it is anti-, biocidal property is more prominent, staphylococcus aureus, bacillus pyocyaneus, escherichia coli, Candida albicans etc. all there is obvious killing action, so, also having employing fiber crops material is raw material production viscose rayon.
Such as Patent No. 200410004397.8, the patent of invention entitled fiber crops material cellulose viscose pulp and functional fibre preparation method discloses a kind of utilization fiber crops material and produces cellulose viscose pulp and method, get the raw materials ready → blank → screen → wash material → pretreatment → steaming and decocting → extrude → discongest → desanding including fiber crops material, concentration → chlorination → alkali refining → bleaching → acid treatment → desanding, concentrate → manufacture paper with pulp step, but its technological process is long, complicated, supplies consumption in production is bigger, thus have impact on people's utilization to fiber crops material plant, have impact on production and the quality of viscose rayon the most to a certain extent.And due to fiber crops material length length (" fiber crops material is cut into long 20～100 millimeters "), after fiber crops material good water absorption and water suction, strength increases big, is easily wound around agglomerating, easily occurs the phenomenon of line clogging in each step.Equally, Application No. 200810015813.2, fiber crops material, in fiber crops material is got the raw materials ready, is cut into 3～5 long segments, the phenomenon of line clogging the most easily occurs by the patent of invention entitled a kind of hemp dissolving pulp for chemical fabrics and production method thereof.
And for example Patent No. 201110066533.6, the patent of invention entitled a kind of fiber crops material viscose staple fibre and preparation method thereof discloses a kind of method utilizing fiber crops material to produce viscose staple fibre, it include pretreatment, washing, steaming and decocting, wash material, making beating, desanding, concentration, alkali refining, pull an oar, bleach, acid treatment, washing, rear selected desanding, concentrate, step of manufacturing paper with pulp, its technological process is the longest.
Ramie spinning leftover bits and pieces system Boehmeria be processed into degummed ramie after on long bast-fiber spinning apparatus in the course of processing under combing or (automatically falling off) with the chopped fiber of less than 4 a length of masters and tie miscellaneous etc.；Degummed ramie fiber leftover bits and pieces system Boehmeria descends slowly and lightly the chopped fiber in water during being processed into degummed ramie.Due to ramie spinning leftover bits and pieces and degummed ramie fiber leftover bits and pieces fibre length short (modal staple length is below 4), fibre cohesion is poor, difficulty of individually spinning.Generally, for well utilizing ramie spinning leftover bits and pieces and degummed ramie fiber leftover bits and pieces, enterprise is all that it produces on short spinning equipment ramie cotton blending yarn, this blending product number relatively low (generally propping up following at 16 English), product wiriness, its blending product added value is the highest, and part ramee short flannel even can only do the raw material of papermaking, and price is the cheapest.
Summary of the invention
It is an object of the invention to provide hemp dissolving pulp and preparation method that a kind of production craft step simplifies, particularly a kind of employing ramie spinning leftover bits and pieces or degummed ramie fiber leftover bits and pieces prepare hemp dissolving pulp and preparation method.
The patent of Patent No. 201010238630.4 discloses a kind of alkaline pectinase production method and the application in paper-making pulping.It obtains alkaline pectase liquid through strain breeding thereof, spawn culture, shake flask fermentation, enzyme liquid preparation process, described strain submits China typical culture collection center preservation on January 11st, 2010, preserving number is: CCTCC NO:M 2010004, and have submitted preservation survival proof on January 15th, 2010.Its enzyme activity determination is to develop the color with DNS, and spectrophotometric colo method records.Its condition determination is: the pectin with 1 pH9.6,60 DEG C of water-baths 10 minutes, adds the colour developing of DNS boiling water bath, 550nm colorimetric for substrate.Enzyme activity unit is defined as: under condition determination, and the enzyme amount needed for hydrolysis of pectin produces 1mg reducing sugar (in terms of galacturonic acid) per hour is defined as an enzyme activity unit.
The present invention adopts the following technical scheme that and realizes its goal of the invention, a kind of hemp dissolving pulp, with fiber crops material as raw material, through cut off, grab cotton, alkaline boiling, pull an oar, bleach, prepared by step of manufacturing paper with pulp, described hemp dissolving pulp quality index is: methylcellulose >=93, lignin≤0.5, pectin≤0.5, irony≤20mg/, little dust≤1502/, big dust≤1.5/kg, the degree of polymerization 400～600.
Fiber crops material of the present invention is ramie spinning leftover bits and pieces or degummed ramie fiber leftover bits and pieces.
The preparation method of a kind of hemp dissolving pulp, it comprises the following steps:
(1) cut off: fiber crops material is cut into 2.0～20；
(2) grab cotton: the numb material after step (1) being cut off sends into griping cotton machine shredding, remove impurity, and the rib extension elongation of described griping cotton machine is 3～5, and Beater Speed is 800r/min～950r/min, and air channel negative pressure is 3kpa～4kpa；
(3) alkaline boiling: first the numb material after step (2) being processed steeps by alkaline pectase immersion in spherical digester；Ferment treatment condition is: alkaline pectase liquid and raw material absolute dry mass are than for 1:10～20, enzyme activity 50u/ml～100u/ml, temperature 50 C～60 DEG C, pH value 8～9, soak time 20min～60min；Then carrying out alkaline boiling, process conditions are: cooking liquor naoh concentration 20g/L～50g/L, feed liquid mass ratio 1:4～6, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 120 DEG C～160 DEG C, temperature retention time 60min～90min；
(4) making beating: the numb material after step (3) being processed processes in beater, and stock quality percentage composition is 10～30, and preferably stock quality percentage composition is 15～25, optimum stock quality percentage composition is 20；
(5) bleaching: the jute pulp after step (4) being processed is bleached in bleaching cistern, then rinses to neutral with water, and bleaching conditions is: hypochlorous acid consumption 0.4g/L～1.0g/L, and temperature is 40 DEG C～60 DEG C, time 30min～60min, pH value 6～7；
(6) manufacture paper with pulp: it is 3.0～6.0 that the concentrated machine of jute pulp after step (5) being processed processes to mass percent concentration, is preferably chosen as 4.0～5.0, then send pulp machine to manufacture paper with pulp, obtain hemp dissolving pulp；Described hemp dissolving pulp quality index is: methylcellulose >=93, lignin≤0.5, pectin≤0.5, irony≤20mg/, little dust≤1502/, big dust≤1.5/kg, the degree of polymerization 400～600.
For making full use of raw material, the present invention step (1) in, described ramee is ramie spinning leftover bits and pieces or degummed ramie fiber leftover bits and pieces.
The present invention step (3) in, described alkaline pectase liquid is prepared through spawn culture, shake flask fermentation, enzyme liquid preparation process by CCTCC NO:M 2010004 strain.
The present invention preferably alkaline boiling process conditions are: cooking liquor naoh concentration is 40g/L～48g/L, and feed liquid mass ratio is 1:4～5, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 140 DEG C～160 DEG C, temperature retention time 70min～80min.
The present invention step (1) in, be preferably chosen as being cut into fiber crops material 5～15, optimum for fiber crops material is cut into 8～10.
For making fiber crops material fiber preferably be loosened, simultaneously remove fiber crops material fiber in impurity and metallics, the present invention step (2) in, the rib extension elongation of described griping cotton machine is 4～5, Beater Speed is 850r/min～900r/min, and air channel negative pressure is 3.5kpa～4kpa.
The present invention step (3) in, preferably ferment treatment condition is: alkaline pectase liquid and raw material absolute dry mass are than for 1:12～15, enzyme activity 60u/ml～80 u/ml, temperature 55 DEG C～60 DEG C, pH value 8.5～9, soak time 40min～50min.
The present invention step (5) in, preferably bleaching conditions is: for hypochlorous acid consumption 0.6 g/L～0.8g/L, temperature is 50 DEG C～55 DEG C, time 40min～50min, pH value 6～6.5.
Owing to using technique scheme, the present invention preferably achieves goal of the invention, and owing to the chopped fiber after using griping cotton machine to cut off carries out remove impurity, loose, one is the chemical substances such as NaoH can be made to penetrate into uniformly in the middle of fiber in alkaline boiling step；Two is to reduce desanding step, makes processing step simplify；Three is the phenomenon generation avoiding easily blocking pipeline when subsequent step sets up desanding step；Meanwhile, use ferment treatment before alkaline boiling, improve boiling efficiency, decrease alkali consumption 20～30；The present invention can make full use of ramie spinning leftover bits and pieces and hemp dissolving pulp made by degummed ramie fiber leftover bits and pieces, the fibre count of the fiber that this pulp is made can reach 1.56～3dtex, the count of yarn made is greatly improved, substantially increase ramie spinning leftover bits and pieces and the spinnability of degummed ramie fiber leftover bits and pieces, too increase the benefit of enterprise.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1:
A kind of hemp dissolving pulp, with fiber crops material as raw material, through cut off, grab cotton, alkaline boiling, pull an oar, bleach, prepared by step of manufacturing paper with pulp, described hemp dissolving pulp quality index is: methylcellulose >=93, lignin≤0.5, pectin≤0.5, irony≤20mg/, little dust≤1502/, big dust≤1.5/kg, the degree of polymerization 400～600.
Fiber crops material of the present invention is ramie spinning leftover bits and pieces or degummed ramie fiber leftover bits and pieces.
The preparation method of a kind of hemp dissolving pulp, it comprises the following steps:
(1) cut off: fiber crops material is cut into 2.0～20, be preferably chosen as being cut into fiber crops material 5～15, optimum for fiber crops material is cut into 8～10；
For making full use of raw material, the present invention step (1) in, described ramee is ramie spinning leftover bits and pieces or degummed ramie fiber leftover bits and pieces.
The present embodiment is ramie spinning leftover bits and pieces, and its modal staple length, below 4, utilizes fibre cutting machine to be cut into 10 long segments.
(2) grab cotton: the numb material after step (1) being cut off sends into griping cotton machine shredding, remove impurity, and the rib extension elongation of described griping cotton machine is 3～5, and Beater Speed is 800r/min～950r/min, and air channel negative pressure is 3kpa～4kpa；The rib extension elongation being preferably chosen as griping cotton machine is 4～5, and Beater Speed is 850r/min～900r/min, and air channel negative pressure is 3.5kpa～4kpa.
The rib extension elongation of the present embodiment griping cotton machine is 4, and Beater Speed is 900r/min, and air channel negative pressure is 4kpa.
This step can make fiber crops material fiber preferably be loosened, and removes the impurity in fiber crops material fiber and metallics simultaneously, decreases the desanding step in subsequent technique.
(3) alkaline boiling: first the numb material after step (2) being processed steeps by alkaline pectase immersion in spherical digester；Ferment treatment condition is: alkaline pectase liquid and raw material absolute dry mass are than for 1:10～20, enzyme activity 50u/ml～100u/ml, temperature 50 C～60 DEG C, pH value 8～9, soak time 20min～60min；Then carrying out alkaline boiling, process conditions are: cooking liquor naoh concentration 20g/L～50g/L, feed liquid mass ratio 1:4～6, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 120 DEG C～160 DEG C, temperature retention time 60min～90min；
The present invention step (3) in, preferably ferment treatment condition is: alkaline pectase liquid and raw material absolute dry mass are than for 1:12～15, enzyme activity 60u/ml～80u/ml, temperature 55 DEG C～60 DEG C, pH value 8.5～9, soak time 40min～50min.
The present invention step (3) in, described alkaline pectase liquid is prepared through spawn culture, shake flask fermentation, enzyme liquid preparation process by CCTCC NO:M 2010004 strain.
The present invention step (3) in, preferably alkaline boiling process conditions are: cooking liquor naoh concentration is 40g/L～48g/L, and feed liquid mass ratio is 1:4～5, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 140 DEG C～160 DEG C, temperature retention time 70min～80min.
The present embodiment alkaline pectase liquid and raw material absolute dry mass are than for 1:12, enzyme activity 80 u/ml, temperature 55 DEG C, pH value 9, soak time 40min；Alkaline boiling process conditions are: cooking liquor naoh concentration is 45g/L, and feed liquid mass ratio is 1:5, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 160 DEG C, temperature retention time 70min.
(4) making beating: the numb material after step (3) being processed processes in beater, and stock quality percentage composition is 10～30, and preferably stock quality percentage composition is 15～25, optimum stock quality percentage composition is 20；
The present embodiment stock quality percentage composition is 20.
(5) bleaching: jute pulp step (4) processed is bleached in bleaching cistern, then rinses to neutral with water, and bleaching conditions is: hypochlorous acid consumption 0.4g/L～1.0g/L, and temperature is 40 DEG C～60 DEG C, time 30min～60min, pH value 6～7；
The present invention step (5) in, preferably bleaching conditions is: for hypochlorous acid consumption 0.6 g/L～0.8 g/L, temperature is 50 DEG C～55 DEG C, time 40min～50min, pH value 6～6.5.
The present embodiment hypochlorous acid consumption 0.8g/L, temperature is 50 DEG C, time 40min, pH value 6.5.
(6) manufacture paper with pulp: it is 3.0～6.0 that the concentrated machine of jute pulp after step (5) being processed processes to mass percent concentration, is preferably chosen as 4.0～5.0, and the present embodiment is 5.0, then send pulp machine to manufacture paper with pulp, obtains hemp dissolving pulp；Described hemp dissolving pulp quality index is: methylcellulose >=93, lignin≤0.5, pectin≤0.5, irony≤20mg/, little dust≤1502/, big dust≤1.5/kg, the degree of polymerization 400～600.
The present embodiment hemp dissolving pulp quality index is: methylcellulose 93.2, lignin 0.36, pectin 0.12, irony 15mg/, little dust 1302/, big 1.2/kg of dust, the degree of polymerization 500.
Embodiment 2:
Step (1) in, described ramee is ramie spinning leftover bits and pieces, and its modal staple length, below 4, is cut into 5 long segments.
Step (3) in, alkaline pectase liquid and raw material absolute dry mass are than for 1:10, enzyme activity 100 u/ml, temperature 55 DEG C, pH value 9, soak time 40min；Alkaline boiling process conditions are: cooking liquor naoh concentration is 25g/L, and feed liquid mass ratio is 1:5, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 140 DEG C, temperature retention time 80min.
Step (5) in, hypochlorous acid consumption 0.7g/L, temperature is 55 DEG C, time 30min, pH value 6.
The hemp dissolving pulp quality index of preparation is: methylcellulose 94.3, lignin 0.31, pectin 0.11, irony 18mg/, little dust 1202/, big 1.4/kg of dust, the degree of polymerization 550.
Remaining with embodiment 1.
Embodiment 3:
Step (1) in, described ramee is degummed ramie fiber leftover bits and pieces, and its modal staple length, below 4, utilizes fibre cutting machine to be cut into 15 long segments.
Step (2) in, the rib extension elongation of griping cotton machine is 5, and Beater Speed is 1000r/min, and air channel negative pressure is 4kpa.
Step (3) in, alkaline pectase liquid and raw material absolute dry mass are than for 1:10, enzyme activity 100 u/ml, temperature 55 DEG C, pH value 9, soak time 40min；Alkaline boiling process conditions are: cooking liquor naoh concentration is 25g/L, and feed liquid mass ratio is 1:5, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 140 DEG C, temperature retention time 70min.
Step (5) in, hypochlorous acid consumption 0.7g/L, temperature is 55 DEG C, time 30min, pH value 6.
The hemp dissolving pulp quality index of preparation is: methylcellulose 93, lignin 0.45, pectin 0.42, irony 15mg/, little dust 11
0㎜2/, big 1.0/kg of dust, the degree of polymerization 600.
Remaining with embodiment 1.
Embodiment 4:
Step (1) in, described ramee is degummed ramie fiber leftover bits and pieces, and its modal staple length, below 4, utilizes fibre cutting machine to be cut into 15 long segments.
Step (2) in, the rib extension elongation of griping cotton machine is 5, and Beater Speed is 1000r/min, and air channel negative pressure is 4kpa.
Step (3) in, alkaline pectase liquid and raw material absolute dry mass are than for 1:15, enzyme activity 60 u/ml, temperature 55 DEG C, pH value 9, soak time 50min；Alkaline boiling process conditions are: cooking liquor naoh concentration is 35g/L, and feed liquid mass ratio is 1:4, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 160 DEG C, temperature retention time 80min.
Step (5) in, hypochlorous acid consumption 0.7g/L, temperature is 55 DEG C, time 30min, pH value 6.
The hemp dissolving pulp quality index of preparation is: methylcellulose 93.7, lignin 0.42, pectin 0.38, irony 12mg/, little dust 11 02/, big 1.0/kg of dust, the degree of polymerization 560.
Remaining with embodiment 1.
Embodiment 5:
Step (1) in, described ramee is ramie spinning leftover bits and pieces, and its modal staple length, below 4, utilizes fibre cutting machine to be cut into 15 long segments.
Step (3) in, alkaline pectase liquid and raw material absolute dry mass are than for 1:18, enzyme activity 70 u/ml, temperature 50 C, pH value 9, soak time 60min；Alkaline boiling process conditions are: cooking liquor naoh concentration is 20g/L, and feed liquid mass ratio is 1:4, pressure 0.6 ± 0.05Mpa in spherical digester, temperature 160 DEG C, temperature retention time 80min.
Step (5) in, hypochlorous acid consumption 0.8g/L, temperature is 55 DEG C, time 50min, pH value 6.
The hemp dissolving pulp quality index of preparation is: methylcellulose 93.9, lignin 0.49, pectin 0.37, irony 12mg/, little dust 1002/, big 0.8/kg of dust, the degree of polymerization 570.
Remaining with embodiment 1.
Claims (10)
1. a preparation method for hemp dissolving pulp, is characterized in that comprising the following steps:
(1) cut off: fiber crops material is cut into 2.0～20；Described numb material is ramie spinning leftover bits and pieces or degummed ramie fiber leftover bits and pieces；
(2) grab cotton: the numb material after step (1) being cut off sends into griping cotton machine shredding, remove impurity, and the rib extension elongation of described griping cotton machine is 3～5, and Beater Speed is 800r/min～950r/min, and air channel negative pressure is 3kPa～4kPa；
(3) alkaline boiling: first the numb material after step (2) being processed steeps by alkaline pectase immersion in spherical digester；Ferment treatment condition is: alkaline pectase liquid and raw material absolute dry mass are than for 1:10～20, enzyme activity 50 u/ml～100u/ml, temperature 50 C～60 DEG C, pH value 8～9, soak time 20min～60min；Then carrying out alkaline boiling, process conditions are: cooking liquor naoh concentration 20g/L～50g/L, feed liquid mass ratio 1:4～6, pressure 0.6 ± 0.05MPa in spherical digester, temperature 120 DEG C～160 DEG C, temperature retention time 60min～90min；
Step (3) in, described alkaline pectase liquid is by CCTCC NO:M
2010004 strains prepare through spawn culture, shake flask fermentation, enzyme liquid preparation process；
(4) making beating: the numb material after step (3) being processed processes in beater, and stock quality percentage composition is 10～30；
(5) bleaching: the jute pulp after step (4) being processed is bleached in bleaching cistern, then rinses to neutral with water, and bleaching conditions is: hypochlorous acid consumption 0.4g/L～1.0g/L, and temperature is 40 DEG C～60 DEG C, time 30min～60min, pH value 6～7；
(6) manufacture paper with pulp: it is 3.0～6.0 that the concentrated machine of jute pulp after step (5) being processed processes to mass percent concentration, then send pulp machine to manufacture paper with pulp, obtains hemp dissolving pulp；Described hemp dissolving pulp quality index is: methylcellulose >=93, lignin≤0.5, pectin≤0.5, irony≤20mg/, little dust≤1502/, big dust≤1.5/kg, the degree of polymerization 400～600.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (3) in, preferably alkaline boiling process conditions are: cooking liquor naoh concentration is 40g/L～48g/L, feed liquid mass ratio is 1:4～5, pressure 0.6 ± 0.05MPa in spherical digester, temperature 140 DEG C～160 DEG C, temperature retention time 70 min～80min.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (1) in, fiber crops material is cut into 5～15.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (2) in, the rib extension elongation of described griping cotton machine is 4～5, and Beater Speed is 850r/min～900r/min, and air channel negative pressure is 3.5kPa～4kPa.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (3) in, preferably ferment treatment condition is: alkaline pectase liquid and raw material absolute dry mass are than for 1:12～15, enzyme activity 60u/ml～80 u/ml, temperature 55 DEG C～60 DEG C, pH value 8.5～9, soak time 40min～50min.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (5) in, preferably bleaching conditions is: for hypochlorous acid consumption 0.6g/L～0.8g/L, temperature is 50 DEG C～55 DEG C, time 40min～50min, pH value 6～6.5.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that the concentrated machine of the jute pulp after step (5) being processed processes to mass percent concentration is 4.0～5.0, then send pulp machine to manufacture paper with pulp, obtains hemp dissolving pulp.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (1) in, fiber crops material is cut into 8～10.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (4) in, described stock quality percentage composition is 15～25.
The preparation method of hemp dissolving pulp the most according to claim 1, it is characterized in that step (4) in, described stock quality percentage composition is 20.
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| CN105887539B (en) * | 2016-04-21 | 2017-09-22 | 邯郸市祥源特种纤维有限公司 | A kind of dry cutting method produces the method and system of pure cotton pulp |
| CN111379187B (en) * | 2018-12-28 | 2022-03-15 | 安徽雪龙纤维科技股份有限公司 | Insulating pulp board and production method thereof |
| CN109771138A (en) * | 2019-02-21 | 2019-05-21 | 苏州恒星医用材料有限公司 | A kind of medical gradual change pressure socks and its production technology |
| CN110541323A (en) * | 2019-08-09 | 2019-12-06 | 青岛大学 | Method for preparing pulp by using hemp raw material |
| CN110528102A (en) * | 2019-08-09 | 2019-12-03 | 青岛大学 | A kind of cellulose viscose manufacturing technique based on hemp dissolving pulp |
| CN114150521B (en) * | 2021-12-03 | 2023-02-10 | 太原理工大学 | Preparation method of hemp-based lyocell fiber pulp |
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| US6605350B1 (en) * | 1996-08-23 | 2003-08-12 | Weyerhaeuser Company | Sawdust alkaline pulp having low average degree of polymerization values and method of producing the same |
| CN101280466A (en) * | 2008-04-21 | 2008-10-08 | 山东海龙股份有限公司 | Hemp dissolving pulp for chemical fabrics and production method thereof |
| CN101914510B (en) * | 2010-07-28 | 2011-08-31 | 沅江浣溪沙酶技术有限公司 | Alkaline pectinase production method and application in papermaking pulping |
| CN102181956B (en) * | 2011-03-21 | 2012-11-21 | 山东海龙股份有限公司 | Hemp viscose staple fiber and preparation method thereof |
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