CN1046146C - Method for producing velvet from defective cocoon and waste silk - Google Patents
Method for producing velvet from defective cocoon and waste silk Download PDFInfo
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- CN1046146C CN1046146C CN96117573A CN96117573A CN1046146C CN 1046146 C CN1046146 C CN 1046146C CN 96117573 A CN96117573 A CN 96117573A CN 96117573 A CN96117573 A CN 96117573A CN 1046146 C CN1046146 C CN 1046146C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The present invention relates to a method for manufacturing velour by using defective cocoon and waste silk, which comprises: raw material trash extraction, respective branch shift selection, refinement, floss preparation, floss loose, floss cutting, floss combing, secondary refinement, washing and velour fabrication, wherein the refinement also comprises: boiling, decomposition, repeated refinement, drying, etc. Moreover, refinement technologies of various raw materials are different. The present invention has the advantages of scientific and rational production technology, waste utilization and raw material comprehensive utilization. In addition, the velour manufactured by the method has the advantages of little silk fiber damage, strong ventilation property, softness, smoothness, sweat suction, dehumidification, good heat insulation in all seasons, and is not easy to form soil hardening. The present invention is particularly suitable for manufacturing heat insulation products of velour quilts, etc.
Description
The invention belongs to the production method of silk fiber, relate to the method for a kind of damaged cocoon, waste silk throwing suede.
For a long time, a large amount of inferior silk cocoon and the silk leftover bits and pieces that produce in silk cocoon breed and filature, the silk spinning production are all abandoned it as refuse, not only cause a large amount of wastes of silk resource, but also cause the pollution to environment.CN1085275A discloses the method for a kind of filature, silk floss, silk spinning leftover bits and pieces processing silk wadding, be characterized in that the leftover bits and pieces with filature, silk floss, silk spinning is a raw material, and through raw material impurity elimination → heat boil → wash → dewater → dry → make the silk wadding finished product after the combing, its shortcoming be raw material that various quality discrepancies are very big in the lump heat boil the impurity such as glue fat that may cause in the part material and fully do not remove, and partly raw material heat is boiled excessively, influence silk quality, this method has also only been utilized inferior silk cocoon of few part and silk leftover bits and pieces simultaneously; CN1103116A discloses a kind of production technology of natural silk flannelette blanket again, being characterized in adopting the real silk staple fibre is raw material, through pretreatment of raw material → clear silk floss → combing slivering → continuous bar merge → spin → float practices → dry → weave → napping → back puts all operations in order and makes natural silk flannelette blanket, therefrom do not see the report of producing the real silk staple fibre, and have the shortcoming of above-mentioned technical literature equally.Above-mentioned two pieces of technical literatures are also not ideal enough to the comprehensive utilization situation of the raw material of various different qualities.
The objective of the invention is, design the method for a kind of damaged cocoon, waste silk throwing suede, this method be try one's best influence the natural performance of silk littlely in, substantially remove silk gum, grease, wax, inorganic matter and other impurity in the raw material, thereby make the quality approaching keen-witted and capable silk floss of trying one's best, realize the comprehensive utilization of various damaged cocoons, waste silk.
The present invention is achieved in that
The method of a kind of damaged cocoon, waste silk throwing suede is characterized in that the technological process of this method is: impurity removing, sort stepping → concise → join silk floss → open silk floss → cut silk floss → comb silk floss → blowing → making herbs into wool, and:
A, impurity removing, the method that sorts stepping are: one or more of preparation following raw materials according, remove the non-silk fiber that can obviously discern and impurity in the raw material, and removing tangles also deposits respectively:
A, cocoon class: (1) blood crust cocoon, (2) yellow spotted cocoon, (3) thin shelled cocoon, (4) dupion, (5) cocoon, (6) blood cocoon;
B, silk class: (7) long middle tail, (8) long head, (9) recotti told told;
The concise step of B, various raw materials is respectively:
The concise step of a, cocoon class is: kiering → except that pupa → corruption → multiple white silk → oven dry;
The concise step of b, silk class is: kiering → corruption → multiple white silk → oven dry;
Concise process conditions are:
A, kiering: kiering is carried out 90～100 ℃ of temperature, pH value 8～9.5 in practicing bucket, 6～18 minutes time, the material water weight ratio is 1: 100～120, adds auxiliary soda and washing agent simultaneously, and material alkali weight ratio is 1: 0.008～0.048, and material washing agent weight ratio is 1: 0.04～0.096;
B, corruption: 38～44 ℃ of temperature, pH value 8～8.5 are carried out in corruption in septic tank, 2～7 days time, the water yield is advisable to flood former section, adds auxiliary soda and pancreatin simultaneously, and material alkali weight ratio is 1: 0.0046～0.0053, and material pancreatin weight ratio is 1: 0.0025～0.0035;
C, the multiple white silk: the multiple white silk in practicing bucket carried out 90～98 ℃ of temperature, pH value 8.5～9.5,8～20 minutes time, the material water weight ratio is 1: 55～150, adds auxiliary soda and washing agent simultaneously, and material alkali weight ratio is 1: 0.008～0.048, and material washing agent weight ratio is 1: 0.088～0.216;
C, join silk floss: join continuous method and be with the refined silk of the various raw materials after concise one or more in accordance with regulations proportioning take by weighing and make the dispensing ball;
D, open silk floss: open silk floss and be and dispensing ball warp waste silk opener is tentatively mixed and make that fiber tentatively stretches, thickness is continuous uniformly opens;
E, cut silk floss: cut silk floss and be and silk floss is opened the silk floss that is cut into prescribed level after the middle filling machine combing open and be rolled into the bar silk floss;
F, comb are continuous: the comb silk floss is that the bar silk floss is inserted combing in the dressing machine, divides and combs than filament fiber and short silk;
G, blowing: blowing is the weak point silk to be inserted comb the pine processing in the continuous clearly machine;
H, making herbs into wool: making herbs into wool is that the short silk of comb pine is inserted in the wool-weaving machine, makes tow divide the staple fibre of combing the pine bubble after treatment.
Further scheme is, the concise step of blood crust cocoon is: not otch cocoon → kiering → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry → and except that pupa → kiering → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry.
Further scheme is that the concise step of yellow spotted cocoon, thin shelled cocoon, dupion, cocoon, blood cocoon is: not otch cocoon → kiering → hot water wash → and except that pupa → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry.
Further scheme is: length is told, the concise step of recotti is: kiering → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry.
Further scheme is again: length is told in the concise step of head, is provided with between kiering and hot water wash and beats technology.
Further scheme is: the length of the short silk of described intermediate products is less than 35mm.
Further scheme is: the moisture content of the refined silk of the various raw materials after concise is 8～13%, is beneficial to combing and blowing.
Further scheme is: in order further to remove the materials such as grease in the silk fiber, eliminate peculiar smell, improve the color and luster of silk fiber, it is concise that the refined silk of the raw material after concise can carry out secondary again, and comparatively reasonable plan is that the secondary refining process is located between comb silk floss and the blowing, its technological process is: a white silk → washing → dehydration → oven dry, one white silk carries out in practicing bucket, its process conditions are: 90～100 ℃ of temperature, pH value 8.5～9,20～30 minutes time, the material water weight ratio is 1: 50～100, add auxiliary soda and washing agent simultaneously, and expect that the alkali number ratio is 1: 0.12～0.048, material washing agent weight ratio is 1: 0.048～0.072.
Further scheme is, in the secondary refining process, between dehydration and oven dry, also can be provided with two and practice technology, its processing step is: two white silk → washings → dehydration, two process conditions of practicing are: 90～96 ℃ of temperature, pH value 8～9,30～50 minutes time, the material water weight ratio is 1: 50～100, add auxiliary soda, washing agent and bleaching agent simultaneously, and material alkali weight ratio is 1: 0.016～0.048, and material washing agent weight ratio is 1: 0.048～0.096, and material bleaching agent weight ratio is 1: 0.05～0.1.
Further scheme is, described washing process is: hot water wash → cold wash.And described hot temperature is 45～70 ℃, and cold water is running water.Hot water wash can make materials such as solubility glue fat be removed better, but only then both be unfavorable for energy-conservation with hot water wash, also may influence the quality of silk, so be good with cold water flush again after the hot water wash, and the hot water temperature should not be low excessively, also should not be too high, practice shows that the hot water temperature is controlled at 45～70 ℃ and is advisable.
Scheme is preferably, and described washing agent is Lei Mibang, soap or its mixture.
Better scheme is that described bleaching agent is bleaching powder, hydrogen peroxide or its mixture.
In the present invention, kiering, temperature concise and two white silks should not be lower than 90 ℃, otherwise scouring result is relatively poor; The corruption temperature is crossed to hang down and is not also reached ideal effect, and temperature is higher, may influence the quality of silk again, therefore is controlled at 38～44 ℃ and is advisable.The consumption of various auxiliary agents also can change to some extent, but if the soda ash consumption is excessive, the then easy brittle failure of silk fiber, when soap is too much, calcium ions and magnesium ions increases in the water, influence the combing of silk fiber, certain dependency relation is in fact arranged between temperature, time and the auxiliary dosage, process conditions of the present invention institute restricted portion is the comparatively ideal control scope of finding out through practice repeatedly.
In the present invention, kiering, concise, secondary are practiced, corruption all should keep certain basicity, but if basicity is excessive, can damage silk fiber equally, in practice, can adjust the size of water yield control pH value.
Adopt that the inventive method makes than filament fiber, can be used as the raw material of silk spinning, blending or other textiless.
The final products velvet that adopts the inventive method to make both can be made velvet blanket etc. through further processing, can directly insert in the various one-tenth jackets again, made warm miscellaneous, as velvet quilt, velvet pad etc.
Advantage of the present invention is, in refinery practice, adopted the refining process that is not quite similar at different raw materials, thereby both guaranteed the unlikely destruction of natural performance of silk fiber, obtained the keen-witted and capable silk floss of the higher quality of basic free from extraneous odour again; In producing the process of velvet, as long as adjust the proportioning of the refined silk of different material, can obtain to satisfy the velvet of different levels needs, with the time-division comb out can for make other textiless than filament fiber, realized turning waste into wealth and the comprehensive utilization of raw material; In whole process of production, owing to adopted scientific and reasonable technological process, thus both guaranteed the quality of intermediate products and final products, again production cost has been controlled in the reasonable range.The warm that the velvet that makes with the present invention is made, silk fiber is shorter, is difficult for hardening, and gas permeability is strong, and is soft fine and smooth, and the absorbing sweat dehumidifying is cool in summer and warm in winter.
Provide embodiments of the invention below, and the present invention is described further.
The method of a kind of damaged cocoon, waste silk throwing suede is: impurity removing, sort stepping → concise → join silk floss → open silk floss → cut silk floss → comb silk floss → two white silk → blowings → making herbs into wool.
A: one or more of preparation following raw materials according, manually remove non-silk fiber and impurity that the naked eyes in the raw material can obviously be discerned, releasing is tangled and is deposited respectively:
A, cocoon class: (1) blood crust cocoon, (2) yellow spotted cocoon, (3 thin shelled cocoons, (4) dupion, (5) cocoon, (6) blood cocoon;
B, silk class: (7) long middle tail, (8) long head, (9) recotti told told.
B, (1) follow these steps to carry out above-mentioned raw materials concise respectively:
The concise step of a, blood crust cocoon is: not otch cocoon → kiering → hot water wash → corruption → hot water wash → cold wash → dehydration → multiple white silk → hot water wash → cold wash → dehydration → oven dry → and except that pupa → kiering → hot water wash → corruption → hot water wash → cold wash → dehydration → multiple white silk → hot water wash → cold wash → dehydration → oven dry.
The concise step of b, yellow spotted cocoon, thin shelled cocoon, dupion, cocoon, blood cocoon is: not otch cocoon → kiering → hot water wash → and except that pupa → hot water wash → corruption → hot water wash → cold wash → dehydration → multiple white silk → hot water wash → cold wash → dehydration → oven dry.
C, long concise step of telling middle tail, recotti are: kiering → hot water wash → corruption → hot water wash → cold wash → dehydration → multiple white silk → hot water wash → cold wash → dehydration → oven dry.
D, long concise step of telling head are: beat with beater after the kiering, all the other steps are consistent with the concise step that length is told middle tail, recotti.
(2) concise process conditions are:
A, kiering and multiple white silk: kiering and multiple the white silk in wooden the white silk in the bucket are carried out 95 ℃ of temperature, the every barrel of 25Kg that feeds intake.Various raw material kierings and multiple all the other conditions of practicing see Table 1 and table 2.
B, corruption: the various raw materials of corruption that need are all degenerated in septic tank, 42 ℃ of temperature, and pH value 8～8.5,3～5 days time, every pond 150Kg that feeds intake, the water yield is advisable to flood raw material, adds 750g soda ash simultaneously, the 300g pancreatin.
C, hot water wash, the temperature of cold wash is: 50 ℃ of hot water temperatures, cold water is running water.
D, dehydration: dewatering process is realized by centrifugal dehydrator, and the moisture content of dehydration back raw material is below 45%.
E, oven dry: stoving process is realized by dryer, and the moisture of keen-witted and capable silk floss is 10%.
F, remove pupa: remove pupa and realize by removing the pupa machine, should dry before blood crust cocoon removes pupa, all the other cocoon classes are removed pupa and are carried out after dehydration.
(3) be lower than particularly recotti raw material of 5% silk class for some oil-containings, its refining process can not need be degenerated process.
C, join silk floss: join silk floss and be with in the refined silk of the various raw materials after concise one or more in accordance with regulations proportioning take by weighing and make the dispensing ball, such as take by weighing the long 150g that tells at every turn, recotti 100g, macula lutea 50g, two palace 50g, blood crust cocoon 100g is total to the 450g refined silk, with manually it being mixed and drawing into the dispensing ball.
D, with above-mentioned can make after dispensing ball warp DJ061 type waste silk opener → DJ171 type middle filling machine → CZ161 type dressing machine is handled successively can be used for other textiles than filament fiber and length less than the short silk of the intermediate products of 35mm.
E, two practices short silk:
A, two processing steps of practicing are: a white silk → hot water wash → dehydration → two white silk → hot water wash → cold wash → dehydration → oven dry.
B, two process conditions of practicing are: 90 ℃ every barrel 50Kg that feeds intake of temperature, all the other conditions see Table 3.
F, can make velvet through continuous machine → A034 six rollers of A006B type after clear continuous machine → BC272B type wool-weaving machine is handled successively through two short silk refined silks after practicing.
In the present invention, also can allocate an amount of concise silk fiber that do not need in the dispensing ball after concise into, as husks etc.
The process conditions of kiering
Table 1
| The project raw material | Soda ash (g) | Lei Mibang (ml) | Water (kg) | PH value | Time (branch) |
| Blood crust cocoon | 1100 | 1000 | 2500 | 9 | 15 |
| Yellow spotted cocoon | 1000 | 1500 | 2500 | 8.5 | 18 |
| Thin shelled cocoon | 900 | 1000 | 2500 | 8.5 | 15 |
| Dupion | 1000 | 1500 | 2500 | 8.5 | 18 |
| Cocoon | 900 | 1500 | 2500 | 8.5 | 18 |
| The blood cocoon | 1100 | 1200 | 2500 | 8.5 | 18 |
| Length is told middle tail | 800 | 1500 | 2500 | 8-8.5 | 15 |
| The long head of telling | 850 | 1500 | 2500 | 8.5 | 18 |
| Recotti | 1200 | 1000 | 2500 | 9.5 | 15 |
The multiple process conditions of practicing
Table 2
| The project raw material | Soda ash (g) | Lei Mibang (ml) | Soap (company) | Water (kg) | PH value | Time (branch) |
| Blood crust cocoon | 1000 | 1500 | 3 | 2000 | 8.5-9 | 10-12 |
| Yellow spotted cocoon | 900 | 1300 | 3 | 2000 | 8.5-9 | 12-15 |
| Thin shelled cocoon | 800 | 1000 | 3 | 2000 | 8.5-9 | 8-10 |
| Dupion | 1100 | 1200 | 3 | 2000 | 8.5-9 | 10-12 |
| Cocoon | 800 | 1000 | 3 | 2000 | 8.5-9 | 8-10 |
| The blood cocoon | 1000 | 1300 | 3 | 2000 | 8.5-9 | 8-12 |
| Length is told middle tail | 900 | 1500 | 3 | 2000 | 8.5-9 | 10-15 |
| The long head of telling | 1000 | 2000 | 3 | 2000 | 8.5-9.2 | 15-20 |
| Recotti | 1200 | 2000 | 3 | 2000 | 9-9.5 | 10-15 |
Two process conditions of practicing
Table 3
| Project technology | Soda ash (g) | Lei Mibang (ml) | Hydrogen peroxide (g) | Water (kg) | PH value | Time (branch) |
| One practices | 800 | 1500 | ?/ | 2500 | 8.5 | 25 |
| Two practice | 500 | 800 | 3000 | 1500 | 8 | 40 |
Claims (12)
1, the method for a kind of damaged cocoon, waste silk throwing suede is characterized in that the technological process of this method is: impurity removing, sort stepping → concise → join silk floss → open silk floss → cut silk floss → comb silk floss → blowing → making herbs into wool, and:
A, impurity removing, the method that sorts stepping be, one or more of preparation following raw materials according are removed non-silk fiber and impurity in the raw material, and removing tangles also deposits respectively:
A, cocoon class: (1) blood crust cocoon, (2) yellow spotted cocoon, (3) thin shelled cocoon, (4) dupion, (5) cocoon, (6) blood cocoon;
B, silk class: (7) long middle tail, (8) long head, (9) recotti told told;
The concise step of B, various thick material is respectively:
The concise step of a, cocoon class is: kiering → except that pupa → corruption → multiple white silk → oven dry;
The concise step of b, silk class is: kiering → corruption → multiple white silk → oven dry;
Concise process conditions are:
A, kiering: kiering is carried out 90～100 ℃ of temperature, pH value 8～9.5 in practicing bucket, 6～18 minutes time, the material water weight ratio is 1: 100～120, adds auxiliary soda and washing agent simultaneously, and material alkali weight ratio is 0.008～0.048, and material washing agent weight ratio is 1: 0.04～0.096;
B, corruption: 38～44 ℃ of temperature, pH value 8～8.5 are carried out in corruption in septic tank, 2～7 days time, the water yield is advisable to flood raw material, adds auxiliary soda and pancreatin simultaneously, and material alkali weight ratio is 1: 0.0046～0.0053, and material pancreatin weight ratio is 1: 0.0025～0.0035;
C, the multiple white silk: the multiple white silk in practicing bucket carried out 90～98 ℃ of temperature, pH value 8.5～9.5,8～20 minutes time, the material water weight ratio is 1: 55～150, adds auxiliary soda and washing agent simultaneously, and material alkali weight ratio is 1: 0.008～0.048, and material washing agent weight ratio is 1: 0.088～0.216;
C, join silk floss: join continuous method and be with in the refined silk of the various raw materials after concise one or more in accordance with regulations proportioning take by weighing and make the dispensing ball;
D, open silk floss: open silk floss and be and dispensing ball warp waste silk opener is tentatively mixed and make that fiber tentatively stretches, thickness is continuous uniformly opens;
E, cut silk floss: cut silk floss and be and silk floss is opened the silk floss that is cut into prescribed level after the middle filling machine combing open and be rolled into the bar silk floss;
F, comb are continuous: the comb silk floss is that the bar silk floss is inserted combing in the dressing machine, divides and combs than filament fiber and short silk;
G, blowing: blowing is the weak point silk to be inserted comb the pine processing in the continuous clearly machine;
H, making herbs into wool: making herbs into wool is that the short silk of comb pine is inserted in the wool-weaving machine, makes tow divide the staple fibre of combing the pine bubble after treatment.
2, the method for damaged cocoon according to claim 1, waste silk throwing suede is characterized in that the concise step of blood crust cocoon is: not otch cocoon → kiering → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry → and except that pupa → kiering → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry.
3, the method for damaged cocoon according to claim 1, waste silk throwing suede is characterized in that the concise step of yellow spotted cocoon, thin shelled cocoon, dupion, cocoon, blood cocoon is: not otch cocoon → kiering → hot water wash → and except that pupa → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry.
4, the method for damaged cocoon according to claim 1, waste silk throwing suede is characterized in that length is told, the concise step of recotti is: kiering → hot water wash → corruption → washing → dehydration → multiple white silk → washing → dehydration → oven dry.
5, the method for damaged cocoon according to claim 4, waste silk throwing suede is characterized in that telling in the concise step of head in length, also is provided with between kiering and hot water wash and beats technology.
6, the method for damaged cocoon according to claim 1, waste silk throwing suede is characterized in that described short filament length degree is less than 35mm.
7, according to the method for claim 1 or 2 or 3 or 4 described damaged cocoons, waste silk throwing suede, the moisture content of the refined silk after it is characterized in that drying is 8～13%.
8, the method for damaged cocoon according to claim 1, waste silk throwing suede, it is characterized in that between comb silk floss and blowing, also being provided with the secondary refining process, its technological process is: a white silk → washing → dehydration → oven dry, one process conditions of practicing are: temperature 90-100 ℃, pH value is 8.5-9, time 20-30 minute, the material water weight ratio is 1: 50-100, add auxiliary soda and washing agent simultaneously, and material alkali weight ratio is 1: 0.012-0.048, material washing agent weight ratio is 1: 0.048-0.072.
9, the method for damaged cocoon according to claim 8, waste silk throwing suede, it is characterized in that also being provided with two between the dehydration of secondary refining process and oven dry practices technologies, its processing step is: two white silk → washings → dehydration, two process conditions of practicing are temperature 90-96 ℃, pH value 8-9, time 30-50 minute, the material water weight ratio is 1: 50-100, add auxiliary soda, washing agent and bleaching agent simultaneously, and material alkali weight ratio is 1: 0.016-0.048, material washing agent weight ratio is 1: 0.048-0.096, material bleaching agent weight ratio is 1: 0.05-0.1.
10, according to the method for claim 2 or 3 or 4 or 8 or 9 described damaged cocoons, waste silk throwing suede, it is characterized in that washing process is: hot water wash → cold wash, and described hot water temperature is 45-70 ℃, cold water is running water.
11, according to the method for claim 1 or 8 or 9 described damaged cocoons, waste silk throwing suede, it is characterized in that described washing agent is Lei Mibang, soap or its mixture.
12, the method for damaged cocoon according to claim 9, waste silk throwing suede is characterized in that described bleaching agent is bleaching powder, hydrogen peroxide or its mixture.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117573A CN1046146C (en) | 1996-05-31 | 1996-05-31 | Method for producing velvet from defective cocoon and waste silk |
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| Application Number | Priority Date | Filing Date | Title |
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| CN96117573A CN1046146C (en) | 1996-05-31 | 1996-05-31 | Method for producing velvet from defective cocoon and waste silk |
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| CN1149636A CN1149636A (en) | 1997-05-14 |
| CN1046146C true CN1046146C (en) | 1999-11-03 |
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| CN1085275A (en) * | 1992-10-08 | 1994-04-13 | 莒县东莞乡社会福利综合厂 | The method of filature, silk floss, silk spinning leftover bits and pieces processing silk wadding |
| CN1103116A (en) * | 1993-11-17 | 1995-05-31 | 绍兴市绒毯厂 | Natural silk flannelette blanket and producing technology |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1085275A (en) * | 1992-10-08 | 1994-04-13 | 莒县东莞乡社会福利综合厂 | The method of filature, silk floss, silk spinning leftover bits and pieces processing silk wadding |
| CN1103116A (en) * | 1993-11-17 | 1995-05-31 | 绍兴市绒毯厂 | Natural silk flannelette blanket and producing technology |
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