CN1130216A - Technology and equipment for ramie biological degumming process - Google Patents
Technology and equipment for ramie biological degumming process Download PDFInfo
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- CN1130216A CN1130216A CN 95112564 CN95112564A CN1130216A CN 1130216 A CN1130216 A CN 1130216A CN 95112564 CN95112564 CN 95112564 CN 95112564 A CN95112564 A CN 95112564A CN 1130216 A CN1130216 A CN 1130216A
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Abstract
The characteristic lies in that a high efficient degumming strain T85-260 is selectively breeded, after properly cultivated, it is inoculated on the ramie by using the soaking way, under the moist condition, the biochemical reactions of "gum cultivating bacteria-bacteria producing enzyme-enzyme degumming" are undergone, then through washing ramie with the ramie washer, bleaching, conventional oiling and stoving processes, the raw ramie is made into pure ramie fibres with broad spectrum of spinnability. Compared with the conventional chemical method, said method has the advantages of energy saving rate up to 40%, the technological adjuncts decreasing by 70-80%, fibre length and modulus of torsion increasing separately by 20% and 130% and total amount of pollution source decreasing over 50%.
Description
The present invention relates to the new technology and the equipment thereof of China grass degumming in the textile industry.
Ramie is a kind of high yield, high-quality, efficient bast fiber crop that originates in China.Agricultural product-ramie (raw ramie that the peasant obtains by decorticating, claim raw ramie again), must be through coming unstuck, remove its non-cellulose material and (comprise pectin, hemicellulose, lignin, cerolipoid, the hydrotrope etc., general designation ramie colloid, account for raw ramie weight 22～30%), could obtain ramee loose, pure white, that can be used for spinning cotton and weaving cloth.It is the conventional chemical degumming tech at center that the extensive both at home and abroad at present ramie degumming method that adopts remains with the caustic soda boiling-off.Its technology path is generally: raw ramie → bundle boils (vapour pressure 2.0～2.5kg/cm to dress cage → pickling (bath raio 1: 8～10, sulfuric acid 4.5g/l, about 50 ℃, 30 minutes) →
2, 1.5h, bath raio 1: 10, NaOH concentration 6～8g/l) → wash fiber crops (60 ℃ of hot water, bath raio 1: 10) → two to boil (vapour pressure 2.0～2.5kg/cm
2, 2.5h, bath raio 1: 10, NaOH concentration 14～18g/l, auxiliary agent about 2%) → wash fiber crops (60～80 ℃ of hot water, bath raio 1: 10) → beat fine → float pickling (combination machine) → oil supply → dehydration → oven dry (degummed ramie).The subject matter that this method exists is: consume a large amount of industrial chemicals and the energy, one ton of raw ramie consumption of every processing solid caustic soda, 150～200kg, concentrated sulfuric acid 45kg, the about 2.5T of raw coal, water 600m
3, about electricity 350 degree; Damage the intrinsic good characteristic of ramee and reduce fiber production, High Temperature High Pressure and strong acid strong lye make the microfiber of original intersection, aligned twisted become straight when separating colloid, and hydrolysis the low cellulosic molecule end of degree of crystallinity, cause that the resultant yarn cohesive force is poor, the fabric prodding and itching feeling is obvious, the row yielding of coming unstuck is generally 62～65%; Contaminated environment is serious, and these pollute except a large amount of inputs from degumming tech energy consumption, industrial chemicals, and also from raw ramie itself, the COD value is on average up to about 10000mg/l in its high-concentration waste water; The factory cost height, raw ramie per ton to the processing charges of degummed ramie about 3000 yuan.
In addition, also reported first generation biological degumming method both at home and abroad, promptly based on the biological degumming technique of microbial fermentation effect or micro-organism enzyme preparation (crude enzyme liquid) catalytic action.Wherein reach the production application level at first, use at most aborning and the best technology of resultant effect is " combined bacterial-chemical process for hemp degumming " (patent No.: 85103481, nineteen ninety is obtained national invention third prize).Compare with the conventional chemical degumming tech, this technology is saved industrial chemicals 42.3%, saves energy consumption 23.6%, 4.5 times of the wear-resisting raisings of fiber, and the row yielding of coming unstuck improves 4.9 percentage points, and COD reduces by 56% in the high-concentration waste water, and processing cost reduces about 15%.Yet also there is unsatisfactory part in this technology, and is big as the bacterial strain oxygen demand, adds enzyme and lives not too highly, and the cycle of coming unstuck is long to cause power consumption bigger; Microbial enzyme is not thorough to the colloid structural deterioration, still needs sig water refining under the High Temperature High Pressure behind the biological degumming; Because soda boiling has certain negative interaction to fibre structure, therefore, the ramee textile performance that combined bacterial-chemical comes unstuck does not reach desirable level yet.In addition, adopt enzyme preparation to come unstuck also to exist production cost higher, enterprise is difficult to problems such as acceptance.
The objective of the invention is subject matter at the ramie conventional chemical comes unstuck and the biochemistry combined degum method exists, a kind of biological degumming technique technology is provided, make it compared with the prior art, have energy-conservation, reduce the technology auxiliary material, improve the row yielding of coming unstuck, keep fibre length and distortion number not influenced by process, improve spinning property, reduce characteristics such as pollution sources.Simultaneously, provide a kind of equipment for this technology---wash numb machine.
Technical solution of the present invention is by the efficient degumming strain of seed selection, and utilizes this bacterial strain that ramee is carried out biological degumming processing, forms the new biological degumming technique of a cover.Its technical scheme comprises: (1) efficient degumming strain seed selection; (2) efficient bacterial strain biological characteristics and technology of preparing thereof; (3) biological degumming technique parameter; (4) biological degumming fiber crops aftertreatment technology.Simultaneously, wash numb machine for the aftertreatment technology design trial-production of biological degumming fiber crops is a kind of.This is washed numb machine and adopts the roll-type structure, promptly by discaling roll and smooth roll the fiber crops of coming unstuck is carried out roll and cleans.
(1) efficient degumming strain seed selection: from the Hunan, fiber crops districts such as Hubei, Guangdong, Henan, Anhui gather 109 parts in bacterium sample, therefrom separate come unstuck 501 of the bacterial strains of ability of tool, through repeated screening, the strongest with the bacterial strain that the is numbered T85-260 ability of coming unstuck.Pectin, hemicellulose and total colloid remove and are respectively 88.3%, 29.0% and 60.6%, improve 51,16 and 13 percentage points respectively than T66 bacterial strain.
(2) biological characteristics of its efficient degumming strain T85-260 and technology of preparing thereof: microscopy is the Gram-negative sporeless bacterium.Ordinary nutrient agar glucose flat board grew up to the light yellow sub-translucent lawn of epithelium shape in 12～14 hours, and the edge is irregular; Nutrient broth is cultivated has turbidity sediment, aerobism to be determined as facultative aerobic bacteria.These bacterium purification and rejuvenation adopt pectin plate to separate, and promptly formed circular bacterium colony in 24～36 hours and transparent circle occurred around it.The pectin plate culture medium prescription is: pectin 0.6～1.2%, peptone 0.2～0.6%, pig cholate 0.8～1.2%, yeast juice 0.08～0.12%, (NH
4)
2HPO
40.08～0.12%, the brilliant green solution 0.5～1.5% of 0.2g/l, agar 1.8～2.0%, PH6.5～7.2.This bacterium activation and spread cultivation employing meat soup, common soybean cake powder inorganic salts or flour inorganic salt solution (flour 1.0～2.0%, diammonium hydrogen phosphate 0.04～0.06%, potassium dihydrogen phosphate 0.04～0.06%, yeast juice 0.04～0.06%, magnesium sulfate 0.01～0.02%), well-grown promptly entered exponential phase in 2～4 hours, 6～8 hours, can be used for coming unstuck.This bacterium can grow in PH5.0～9.0 scopes, and optimum PH is 6.5～7.0, and suitable growth temperature is 27～42 ℃, and the optimum growth temperature is 35～37 ℃, and maximum growth temperature is between 40～42 ℃.Carbohydrate fermentation is the result show: the fastest to fermenting speeds such as the difficult mannose of removing, galactolipin in the ramie colloid.Be carrot soft rot Erwinia (Erwinia carotovora, numbering: T85-260) through comprehensively identifying to name.This bacterial strain is submitted the common micro-organisms center preservation of BeiJing ZhongGuanCun China Committee for Culture Collection of Microorganisms to November 12 nineteen ninety-five, is numbered CGMCC95.
(3) biological degumming technique parameter: enlarged culture bacterium liquid is diluted 30～50 times with running water, add agricultural composite fertilizer 0.3～0.7% and be made into bacteria suspension, 35～40 ℃ of temperature, to install numb cage again is immersed in and handles 15～30 minutes in the bacteria suspension, hanging out numb cage places 22～40 ℃ and relative humidity more than or equal to 90% the static fermentation of bacterium degumming pot 7～12 hours, then by bath raio 1: 8～10, with the emerge in worm water of 55 ± 3 ℃ of PH5.5, temperature 3 ± 0.5 hours, through wash numb machine handle the biological degumming fiber crops.Simultaneously, collect and soak the surplus liquid of inoculation, after waiting to replenish spread cultivation bacterium liquid and composite fertilizer, soak the fiber crops inoculation once more.
(4) biological degumming fiber crops aftertreatment technology: fiber crops machine washing fiber crops are washed in the employing of biological degumming fiber crops, bleached H then
2O
2Concentration 0.8～1.8g/l, PH11 ± 0.5,1: 6～8,80～100 ℃ of bath raioes were handled 15～30 minutes, again with 60～80 ℃ clear water wash once get final product the biological processing ramee, through oil supply, dry get final product conventional purposes degummed ramie.
Numb aftertreatment technology equipment comes unstuck---wash numb machine as shown in Figure 2.It is washed numb system and frame etc. by transmission system, roll and forms.Its transmission is by power drive reductor 1, drive discaling roll 4 by driving-chain 3 again, by discaling roll and smooth roll 5 pressure rollings from feeding the fiber crops bucket 11 fiber crops of sending here of coming unstuck, supply water to the roll fiber crops by water inlet pipe 10 simultaneously, realize pressure rolling on one side, clean on one side, the fiber crops of coming unstuck can be cleaned up, from going out 2 outputs of fiber crops bucket, 3～6 times repeatedly, enter down the road bleaching process.Its roller frame 6 is located on the frame 12, and the lining is like portal frame, and the discaling roll axis hole is established on both sides respectively; Its smooth roll 5 is contained in the axis hole of a pair of slide block 9 by roll shaft, and makes the smooth roll roll surface can contact the roll surface of discaling roll 4.Its discaling roll length is 250～350mm, and flute profile is an isosceles triangle, tooth pitch 2.5～3.0mm, tooth depth 1.5～2.0mm; On its slide block 9 spring 8 is installed, the pressure of each spring is 0.5～1.5T, and spring pressure is regulated control by regulating bolt 7.
Owing to adopt above-mentioned technical solution, the fiber crops that are skillful in that the present invention and conventional chemical come unstuck and combined bacterial-chemical comes unstuck compare test, the biological processing fibre length increases by 19.1% and 8.4% respectively, the distortion number increases by 127.5% and 53.1%, collude with powerful raising 64.0% and 30.7%, collude with elongation and improve 39.2% and 8.6%, the row yielding of coming unstuck improves 10.0 and 5.1 percentage points.Electron microscopic observation, intersection, aligned twisted in the microfiber of biological processing degummed ramie are consistent with observation under the native state; The conventional chemical person of coming unstuck straightened condition; Combined bacterial-chemical comes unstuck between between the two, and intersection, twisted phenomena are arranged.
Through measuring and calculating, living fiber crops per ton are increased income and economized on spending income about 2500 yuan, wherein increase production fiber 100kg, save the about 150kg of caustic soda, industrial coal 1.5～2.0T, about 150 degree of commercial power.In addition, pollution sources also reduce significantly and can produce obvious social benefits.
Description of drawings:
Fig. 1 is a technological process block-diagram of the present invention.
Fig. 2 is an equipment of the present invention---wash the schematic diagram of numb machine.
Embodiment
Technological process of the invention process comprises:
Raw ramie is pricked the dress cage
↓
Fiber crops → bleaching → oil supply → the oven dry (degummed ramie) of the preservation bacterial classification → purification and rejuvenation bacterial classification → activated spawn → bacterial classification that spreads cultivation → immersion inoculation → wet fermentation → enzymatic reaction → wash fiber crops machine washing.
1. spawn rejuvenation: adopt pectin plate to separate, promptly formed circular bacterium colony in 30 hours and transparent circle around it, occurs in cultivation under 37 ℃.The pectin plate culture medium prescription is: pectin 0.8%, peptone 0.4%, pig cholate 1.0%, yeast juice 0.1%, (NH
4)
2HPO
40.1%, the brilliant green solution 1% of 0.2g/l, agar 1.8%, PH7.0.
2. actication of culture: adopt the 500ml conical flask to contain meat soup or soya-bean cake (flour) minimal medium 100～400ml, present embodiment connects 1 of colonies typical with 500ml conical flask Sheng flour minimal medium 200ml, 37 ℃ of shaken cultivation 8 hours.Flour minimal medium prescription is: flour 1.0%, (NH
4)
2HPO
40.05%, KH
2PO
40.05%, yeast juice 0.05%, magnesium sulfate 0.01%.
3. bacterial classification spreads cultivation: adopt the common fermentation jar to contain flour inorganic salt solution (flour 1.0%, (NH
4)
2HPO
40.05%, KH
2PO
40.05%, yeast juice 0.05%, magnesium sulfate 0.01%, natural PH) 70～90%, present embodiment is contained culture medium solution 80%, 37 ℃, stirring, obstructed compressed air, cultivates 8 hours.
4. raw ramie is pricked a dress cage: the raw ramie reason direct join of shaking up is bundled into 0.4～0.7kg tuftlet respectively, evenly dresses up numb cage by certain way (laterally keep flat or vertically hang), numb is arranging density 100～120kg/m
3, present embodiment is 110kg/m
3
5. soak inoculation: the bacterium liquid that will spread cultivation is diluted to 39 ℃ of warm water and contains viable bacteria 10
7The bacteria suspension of cfu/ml adds agricultural composite fertilizer in the ratio of 0.5g/l again, and mixing is immersed in numb cage and wherein handles 25 minutes, hangs out numb cage, collects surplus liquid, after waiting to replenish spread cultivation bacterium liquid and composite fertilizer, soaks the fiber crops inoculation once more.
6. wet fermentation: will soak postvaccinal numb cage and place China grass degumming pot (patent No. 892115690), top vent is crack, keeps relative humidity 90%, 37 ℃ of temperature, static 8 hours.
7. enzymatic reaction: by 1: 8 bath raio preparation PH5.5,55 ℃ of aqueous solution of temperature are immersed in the numb cage of wet fermentation and wherein are incubated 3 hours, effluent discharge.
8. wash fiber crops machine washings fiber crops: the fiber crops behind the biological degumming untiing, are shaken up, be laid on the present invention and design on the numb machine of washing of trial-production and wash fiber crops, technological parameter is water column pressure 3.0 ± 0.5kg/cm
2, present embodiment adopts 3kg/cm
2, fiber crops are 5 times pressing number of times through machine, slewing rate 0.3～0.5M/S, and this example is 0.4M/S, charging thickness 3～5mm, this example is 4mm.
9. bleaching: will wash the fiber crops flax fibre of machine-wash and dewater, and after shaking up and adorning cage, place bleaching cistern to bleach.Bleaching liquid contains H
2O
21.5g/l, PH11, bath raio 1: 8,95 ℃ of temperature, are used 75 ℃ of Warm Wash once again at 25 minutes time.
10. oil supply: handle according to a conventional method.
oven dry: handle according to a conventional method.
The present invention adopts the scale of 1kg, 5kg and 20kg raw ramie to implement above-mentioned technological process, and result of implementation shows that the raw ramie of the different places of production, different cultivars, different harvest season, different striking quality all can adopt the present invention to process.The row yielding of coming unstuck is stabilized between 72～76%, improves nearly 10 percentage point than conventional method; Fibre length, twist number, collude with brute force and collude with extending increasing degree respectively about 20%, 130%, 60% and 40%; The energy consumption of process is less than half of conventional method, and the technology auxiliary material is 1/3 of a conventional method only, and the organic pollution index reduces about 60% in the high-concentration waste water.Compare with the combined bacterial-chemical degumming tech, its bacterial strain ability of coming unstuck is strong, stable performance, and the cycle is shorter, and the biological degumming process needn't be ventilated, needn't chemical refining behind the biological degumming, the row yielding of coming unstuck is higher, and fiber quality is better.Therefore, can affirm that the present invention is that one of ramie manufacture field is energy-conservation, high yield, high-quality, second generation biological processing technology efficiently.
Claims (10)
1, a kind of biological degumming of ramie technology, comprise efficient degumming strain seed selection, spawn rejuvenation, actication of culture and enlarged culture, soak inoculation, wet fermentation, enzymatic reaction, wash fiber crops machine washing fiber crops, bleaching, oil supply, technical process such as oven dry, it is characterized in that described efficient degumming strain is to gather the bacterium sample from nature to separate and obtain, be carrot soft rot Erwinia (Erwinia carotovora), code T 85-260, preserving number CGMCC95, its biological characteristics is: the Gram-negative sporeless bacterium, facultative aerobic, can in the scope of PH5.0～9.0, grow, the suitableeest growth PH6.5～7.0, suitable growth temperature is 27～42 ℃, 35～37 ℃ of optimum growth temperatures, maximum growth temperature is between 40～42 ℃, inoculate 2～4 hours and promptly enter exponential phase, glucose nutrient agar panel 12-14 hour grows up to the sub-translucent lawn of epithelium shape.
2, biological degumming of ramie technology according to claim 1, it is characterized in that the separation of carrot soft rot Erwinia CGMCC95 purification and rejuvenation employing pectin plate, promptly formed circular bacterium colony in 24～36 hours and transparent circle occurs around it, the pectin plate culture medium prescription is: pectin 0.6～1.2%, peptone 0.2～0.6%, pig cholate 0.8～1.2%, yeast juice 0.08～0.12%, (NH
4)
2HPO
40.08～0.12%, the brilliant green solution 0.5～1.5% of 0.2g/l, agar 1.8～2.0%, PH6.5～7.2.
3, biological degumming of ramie technology according to claim 1, it is characterized in that the CGMCC95 actication of culture adopts the 500ml conical flask to contain meat soup or soybean cake powder (flour) minimal medium 100～400ml, meet colonies typical 1-3,35～37 ℃ of shaken cultivation 6～10 hours.
4, biological degumming of ramie technology according to claim 1, the enlarged culture technical parameter that it is characterized in that the CGMCC95 bacterial strain is: the common fermentation jar is contained soybean cake powder minimal medium or flour minimal medium 70～90%, nature PH, 35～37 ℃, stir, obstructed compressed air, starter bacteria amount 10
5Cfu/ml cultivates 6～8 hours viable bacteria amounts and reaches 10
8Cfu/ml can be used for coming unstuck, and wherein flour minimal medium prescription is: flour 1.0～2.0%, (NH
4)
2HPO
40.04 KH～0.06%,
2PO
40.04～0.06%, yeast juice 0.04～0.06%, MgSO
40.01～0.02%.
5, biological degumming of ramie technology according to claim 1 is characterized in that soaking the inoculating process parameter and is: reach 10 with 37～40 ℃ of running water dilutions bacterium liquid to viable bacteria amount that spreads cultivation
7The bacteria suspension of cfu/ml adds agricultural composite fertilizer 0.3～0.7g/l, and mixing soaked fiber crops 15～30 minutes by 1: 8～10 bath raioes, collects surplus liquid recycling.
6, biological degumming of ramie technology according to claim 1, it is characterized in that the wet fermentation technological parameter is: postvaccinal numb cage is placed the bacterium degumming pot, and top vent breakdown natural ventilation is incubated 32～37 ℃, relative humidity between 90～95%, static 7～12 hours.
7, biological degumming of ramie technology according to claim 1 is characterized in that the enzymatic reaction technological parameter is: bath raio 1: 8～10, PH5.5 ± 0.3 is incubated 55 ± 3 ℃, 3 ± 0.5 hours.
8, biological degumming of ramie technology according to claim 1 is characterized in that the bleaching process parameter is bath raio 1: 6～8, H
2O
20.8～1.8g/l, PH11 ± 0.5,80～100 ℃ insulation 25～35 minutes is washed once with 60～80 ℃ of clear water again.
9, a kind of equipment that is applicable to the described biological degumming of ramie technology of claim 1---wash numb machine, by reductor [1], go out fiber crops buckets [2], driving-chain [3], discaling roll [4], smooth roll [5], roller seat [6], regulate spiral shell inspection [7], compression spring [8], slide block [9], water inlet pipe [10], feed fiber crops buckets [11] and frame [12] is formed, it is characterized in that: a, described smooth roll [5] are contained in the axis hole of a pair of slide block [9] by roll shaft, and make the smooth roll roll surface can contact the roll surface of discaling roll [4]; B, described discaling roll length 250～350mm, flute profile is an isosceles triangle, tooth pitch 2.5～3.0mm, tooth depth 1.5～2.0mm; C, described slide block [9] are gone up mounting spring [8], and the pressure of its spring is each 0.5～1.5T.
10, according to claim 1 and 9 described biological degumming of ramie technology and equipment, it is characterized in that adopting the technological parameter of washing fiber crops machine washing fiber crops is water column pressure 3.0 ± 0.5kg/cm
2, charging thickness 3.0～5.0mm.Slewing rate 0.3～0.5M/S, fiber crops are pressing 3～6 times through machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95112564A CN1036537C (en) | 1995-11-29 | 1995-11-29 | Technology and equipment for ramie biological degumming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95112564A CN1036537C (en) | 1995-11-29 | 1995-11-29 | Technology and equipment for ramie biological degumming process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1130216A true CN1130216A (en) | 1996-09-04 |
| CN1036537C CN1036537C (en) | 1997-11-26 |
Family
ID=5079625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95112564A Expired - Fee Related CN1036537C (en) | 1995-11-29 | 1995-11-29 | Technology and equipment for ramie biological degumming process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1036537C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100334266C (en) * | 2005-12-20 | 2007-08-29 | 东华大学 | Mfg. of fiber for textile by environment protection biological-chemical method |
| CN101857974A (en) * | 2010-07-09 | 2010-10-13 | 湖南润久科技有限公司 | Method and device for biological degumming of ramie |
| CN1966693B (en) * | 2005-11-15 | 2010-11-10 | 中国农业科学院麻类研究所 | Process for preparing fuel ethanol by enzyme method degradation of ramie phloem fiber |
| CN108660517A (en) * | 2017-09-14 | 2018-10-16 | 曾庆福 | The energy saving and environment friendly keen-witted and capable ramie stripes production system of one kind and its production technology |
| CN110747517A (en) * | 2019-11-18 | 2020-02-04 | 中国农业科学院麻类研究所 | Degumming method for ramie |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235357B (en) * | 2007-09-30 | 2010-07-21 | 中国农业科学院麻类研究所 | Industrial fermentation ramee rapid extraction technique for Erwinia |
| CN103774245B (en) | 2014-02-25 | 2016-04-27 | 武汉纺织大学 | Ramie chain type continuous is without the useless point method for fiber that comes unstuck |
-
1995
- 1995-11-29 CN CN95112564A patent/CN1036537C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1966693B (en) * | 2005-11-15 | 2010-11-10 | 中国农业科学院麻类研究所 | Process for preparing fuel ethanol by enzyme method degradation of ramie phloem fiber |
| CN100334266C (en) * | 2005-12-20 | 2007-08-29 | 东华大学 | Mfg. of fiber for textile by environment protection biological-chemical method |
| CN101857974A (en) * | 2010-07-09 | 2010-10-13 | 湖南润久科技有限公司 | Method and device for biological degumming of ramie |
| CN101857974B (en) * | 2010-07-09 | 2011-06-01 | 湖南润久科技有限公司 | Method and device for biological degumming of ramie |
| CN108660517A (en) * | 2017-09-14 | 2018-10-16 | 曾庆福 | The energy saving and environment friendly keen-witted and capable ramie stripes production system of one kind and its production technology |
| CN110747517A (en) * | 2019-11-18 | 2020-02-04 | 中国农业科学院麻类研究所 | Degumming method for ramie |
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| Publication number | Publication date |
|---|---|
| CN1036537C (en) | 1997-11-26 |
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Free format text: CORRECT: INVENTOR; FROM: LIU ZHENGCHU; PENG DEYUAN; SUN QINGXIANG; FENG XIANGZHI; LV JIANGNAN TO: LIU ZHENGCHU; PENG YUANDE; SUN QINGXIANG; FENG XIANGYUAN; LV JIANGNAN |
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