EP1852529A1 - Procédé d'extraction de fibres de collagène présente dans le derme de peaux d'animaux et un appareil permettant de mettre en oeuvre ce procédé - Google Patents
Procédé d'extraction de fibres de collagène présente dans le derme de peaux d'animaux et un appareil permettant de mettre en oeuvre ce procédé Download PDFInfo
- Publication number
- EP1852529A1 EP1852529A1 EP06009246A EP06009246A EP1852529A1 EP 1852529 A1 EP1852529 A1 EP 1852529A1 EP 06009246 A EP06009246 A EP 06009246A EP 06009246 A EP06009246 A EP 06009246A EP 1852529 A1 EP1852529 A1 EP 1852529A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fibres
- roller
- unravelling
- pieces
- skin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 102000008186 Collagen Human genes 0.000 title claims abstract description 19
- 108010035532 Collagen Proteins 0.000 title claims abstract description 19
- 229920001436 collagen Polymers 0.000 title claims abstract description 19
- 241001465754 Metazoa Species 0.000 title claims abstract description 15
- 239000000243 solution Substances 0.000 claims abstract description 16
- 238000009987 spinning Methods 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims abstract description 8
- 239000000725 suspension Substances 0.000 claims abstract description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 4
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 229920001864 tannin Polymers 0.000 claims description 3
- 235000018553 tannin Nutrition 0.000 claims description 3
- 239000001648 tannin Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000004043 dyeing Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- XTHPWXDJESJLNJ-UHFFFAOYSA-N sulfurochloridic acid Chemical class OS(Cl)(=O)=O XTHPWXDJESJLNJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000001117 sulphuric acid Substances 0.000 claims description 2
- 235000011149 sulphuric acid Nutrition 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000004753 textile Substances 0.000 abstract description 12
- 239000004744 fabric Substances 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 2
- 210000001519 tissue Anatomy 0.000 description 21
- 239000000463 material Substances 0.000 description 20
- 239000000047 product Substances 0.000 description 12
- 239000010985 leather Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229920002994 synthetic fiber Polymers 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 238000009960 carding Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007920 subcutaneous administration Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 238000009941 weaving Methods 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 239000001166 ammonium sulphate Substances 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- JXLHNMVSKXFWAO-UHFFFAOYSA-N azane;7-fluoro-2,1,3-benzoxadiazole-4-sulfonic acid Chemical compound N.OS(=O)(=O)C1=CC=C(F)C2=NON=C12 JXLHNMVSKXFWAO-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 150000001844 chromium Chemical class 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 210000002808 connective tissue Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 238000003307 slaughter Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010784 textile waste Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/04—Mineral tanning
- C14C3/06—Mineral tanning using chromium compounds
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01C—CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES
- D01C3/00—Treatment of animal material, e.g. chemical scouring of wool
Definitions
- the present invention relates to a process for extracting collagen fibres for use in the textile industry from some products and by-products of the tanning industry, such as pieces of "pelt split” and “fleshings", and in general from other tissue obtained from animal skin.
- the invention relates to a machine that carries out this process.
- the tanning step a tissue obtained from animal skin, which is carried out with heavy metal salts, with tannin or other tanning products, changes this tissue into leather or hide, causing it to be manageable in working processes.
- the skin tissue would maintain the features of a soft biological tissue, that could be easily damaged by temperature, bacteria and chemical compounds and would not be useable by the industry.
- a first process provides "milling" the tanned products into small fibre-like particles, generally very short, adapted to covering other textile supports by means of gluing, or mixed with resins and then pressed into "non woven fabric".
- a second type of process provides "Cutting" of the tanned skin into thin strips, then glued in turn with one another, in order to form a continuous thread.
- This method has, however, the drawback of making thick and heavy threads, not adapted to make light fabrics.
- a further process provides "recycling" collagen by means of chemical treatment of materials coming from the slaughtering animals (skins, bones, tendons), or from by-products of the tanning industry (pieces of pelt split and fleshings).
- the long chains of fibres of collagen are broken into molecules of only collagen by means of breaking of the peptidic links with alkali or enzymes.
- the elementary collagen is then treated with aldehydes and/or salt metal such as chromium, aluminum, zirconium etc., and/or epoxy compounds, and then extruded.
- the product that is obtained has a low quality and should be considered as an artificial fibre, in particular, of synthetic fibre.
- Some products and by-products of the tanning industry such as pieces of "pelt split” and “fleshings”, but also in general other waste of tissue obtained from animal skin, are rich of collagen, and then are used to make fibres for textile use.
- garnet also comprises a drum coated outside with steel pins that rotates carrying the material to unravel against toothed cylinders located on the circumference of the same.
- the material, hooked by the pins of the drum, is torn at each passage near the toothed cylinders.
- scrap leather is carded after liming and tanning, and then mixed with dissolved particles and textile fibres or asbestos and eventually spinning.
- the leather waste comprises pelt, i.e. the softer layer of the skin that is normally discarded.
- fibres are prepared from collagen coming from tanning residues. It provides the removal of fleshings (subcutaneous connective tissue, fleshing machine offal) from the skin, and a treatment with lime (liming), a possible treatment with acid (pickling) or removing the lime (deliming), possible to use of enzymes, and then the tanning step, with removal of grease before or after tanning.
- a mechanical disintegration follows in a surplus of water and then unravelling into fibres, partial drying, carding and complete drying, for then proceeding to a spinning into textile fibres with conventional techniques.
- the skin tissue tends to shrink and to compact, complicating the fibres extraction step, the shrinked and tightened fibres, tied to one another, tend to tear than to shrink further. Therefore, the fibres extracted from already tanned skin tissue, leather or hide, as described in the last cited three documents, even if are faster of the technique that gives the better qualitative results that uses drums, are of less quality for a use in the textile industry.
- said unravelling step provides the further steps of:
- said aqueous solution is slightly acidified water, in particular, with formic acid.
- said tanning step comprises
- said tanning step comprises furthermore:
- said tissue obtained from animal skin is selected from the group comprised of:
- the method as above described gives surprising effects for the fact of extracting the collagen fibres from the skin not yet tanned, i.e. in a status of soft biological and putrescible tissue commonly called "pelt” or “limed pelt” or “pickled pelt” or “fleshings".
- the skin tissue not yet tanned is like whitish wet and viscid felt of collagen fibres and this typical viscidity has the merit to decrease the sliding friction of the fibres that then can be "carded” without “tearing” them.
- the tanning step indispensable for giving physical and mechanical characteristics necessary to the textile industry, is carried out after the extraction of the fibres (unravelling step).
- said step of pretreating a skin tissue provides at least one of the following steps:
- said step of treating the carded skin tissue provides at least one of the following steps:
- a fibres extracting apparatus for carrying out the process according to at least one of the above mentioned steps, comprises a unravelling roller having a plurality of pins and an adjustable element adapted to cause said pieces to pass in a forced way against said roller.
- Such adjustable element can pass gradually from a first position, where a maximum gap for said pieces is left with respect to said roller, to a second position, where a minimum gap for said pieces is left with respect to said roller.
- said circulation is obtained making a closed loop channel along which at least one of said rollers is arranged, the rotation of said or each roller causing a flow that drags the solution, the pieces and the fibres in suspension along said channel.
- the apparatus now described owing to its structure and owing to the fact of working with the method according to the invention, carries out a plastic and progressive of the skin in order to decrease at most the number of torn fibres.
- a machine 150 for extracting collagen fibres from the subcutaneous layer of animal skin comprises a tank 200 in which there are arranged a roller 10a, wheeled about its own axis 11 by a motor 90, and a roller 10b wheeled by means of gears 40a and 40b coaxial to cylinders 10a and 10b, in order to generate a flow 100.
- each roller 10 is coated outside with metal pins 15 and is immersed for half of its circumference in a housing 30 arranged perpendicularly to the bath flowing path 40.
- the pins 15 are to locate alternatively, immersed in the housing 30 or contacting any objects present in the bath flowing path, running for the immersion 31 and emersion 32 edges.
- the pins 15 hook the material 50 present in the bath and bring it towards the immersion line 31.
- a comb 35 is arranged, inclined with respect to the tangential envelope of roller 10.
- the comb 35 has teeth 36 that penetrate partially the pins 15 of the roller 10 for blocking the material 50 hooked to them.
- the rotation of the roller 10 causes this way a movement of material 50 from the emersion edge 32 towards immersion edge 31, generating a circulation 100 of the bath in the tank.
- the grid 60 comprises distanced parallel rods in order to leave the liquid to pass along small fractions of material already cut into fibres, and causes larger pieces 50 to flow towards roller 10.
- roller 10 On roller 10 two bars are arranged, one fixed bar 65 and a movable bar 66, which cross all the width of the channel.
- the rods 65 and 66 with the top part of roller 10, define a bottleneck 80 through which the material 50 is forced to pass. In this bottleneck a compression of the material 50 is created, i.e. a high sliding viscous friction.
- rod 66 has an end 67 hinged to fixed rod 65 and the other end 68 movable and provided with a comb with thick and sharp teeth.
- Movable part 66 can then pass, by means of an operating rod 70, from a first position to which a passage gap S1 corresponds (figure 2), when the material 50 to be unravelled is still of large size, to a second position in which the movable part is very close to the pins 15 of roller 10 to which a gap S 2 ⁇ S 1 corresponds for refining progressively the unravelling step (figure 3).
- a mass of fibres adapted to the spinning is obtained with the following process.
- a concentrated solution of a tanning product is added: in this case an acid chromium salt, frequently used by the tanning industry, at a 6% weight ratio of the skin originally loaded in the tank.
- a gentle circulating is kept in the bath for on hour and then it is left still to rest for a night at a temperature kept between 30 and 35 degrees.
- a gentle circulation is kept for about one hour and finally discharged in a carriage having a thick grid, located on the bottom, dripping the liquid surplus and keeping the fibres.
- the fibres After dripping the fibres are put in a centrifugal extractor for spin drying them and then brought on a conveyor belt to be dried in warm air without coming to a complete dried condition.
- the drying step is then completed maintaining the fibres in a chamber with gently circulating warm air for about 24 hours.
- the mass of fibres is then carded, spinned, woven, dyed and refined with very good results, using common plants of the textile industry.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Husbandry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Textile Engineering (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06009246A EP1852529A1 (fr) | 2006-05-04 | 2006-05-04 | Procédé d'extraction de fibres de collagène présente dans le derme de peaux d'animaux et un appareil permettant de mettre en oeuvre ce procédé |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP06009246A EP1852529A1 (fr) | 2006-05-04 | 2006-05-04 | Procédé d'extraction de fibres de collagène présente dans le derme de peaux d'animaux et un appareil permettant de mettre en oeuvre ce procédé |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1852529A1 true EP1852529A1 (fr) | 2007-11-07 |
Family
ID=37110730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06009246A Withdrawn EP1852529A1 (fr) | 2006-05-04 | 2006-05-04 | Procédé d'extraction de fibres de collagène présente dans le derme de peaux d'animaux et un appareil permettant de mettre en oeuvre ce procédé |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP1852529A1 (fr) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013001103A1 (fr) | 2011-06-28 | 2013-01-03 | Lanbide Heziketaren Lagunak, L.H.L | Procédé d'obtention de collagène à partir de la peau d'un animal |
| ITPO20120003A1 (it) * | 2012-03-13 | 2013-09-14 | Alessandro Fratini | Processo per la produzione di materie prime tessili derivanti da mischia di fibre tessili di varia natura con fibre tessili prodotte da collagene. |
| IT202100027044A1 (it) * | 2021-10-21 | 2023-04-21 | Roberto Dimaggio | Metodo per la realizzazione di un filo adatto alla tessitura e filo ottenuto |
| CN116065242A (zh) * | 2022-08-30 | 2023-05-05 | 石河子大学 | 可调节间隙的格条栅组及构成的籽棉清理机 |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1815007A (en) * | 1928-08-06 | 1931-07-14 | Midwest Fulton Machine Co | Beater engine |
| US1959902A (en) * | 1931-10-28 | 1934-05-22 | Intercontinental Rubber Compan | Method of disintegrating cellulosic material |
| US3063892A (en) * | 1959-10-14 | 1962-11-13 | United Shoe Machinery Corp | Preparation of hide fiber |
| US3231463A (en) * | 1960-10-31 | 1966-01-25 | Armour & Co | Method for treating collagen fibers |
| GB1134668A (en) * | 1965-06-04 | 1968-11-27 | Svit Np | Process of obtaining collagen fibres |
| US3652381A (en) * | 1969-08-14 | 1972-03-28 | Vyzk Ustav Kozedelny | Method of preparing collagen fibers |
| US4185011A (en) * | 1978-10-16 | 1980-01-22 | Firma Carl Freudenberg | Process for the production of collagen fibers |
| GB1571561A (en) * | 1976-11-22 | 1980-07-16 | Meiji Seika Kaisha | Dispersion of collagen fibres |
-
2006
- 2006-05-04 EP EP06009246A patent/EP1852529A1/fr not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1815007A (en) * | 1928-08-06 | 1931-07-14 | Midwest Fulton Machine Co | Beater engine |
| US1959902A (en) * | 1931-10-28 | 1934-05-22 | Intercontinental Rubber Compan | Method of disintegrating cellulosic material |
| US3063892A (en) * | 1959-10-14 | 1962-11-13 | United Shoe Machinery Corp | Preparation of hide fiber |
| US3231463A (en) * | 1960-10-31 | 1966-01-25 | Armour & Co | Method for treating collagen fibers |
| GB1134668A (en) * | 1965-06-04 | 1968-11-27 | Svit Np | Process of obtaining collagen fibres |
| US3652381A (en) * | 1969-08-14 | 1972-03-28 | Vyzk Ustav Kozedelny | Method of preparing collagen fibers |
| GB1571561A (en) * | 1976-11-22 | 1980-07-16 | Meiji Seika Kaisha | Dispersion of collagen fibres |
| US4185011A (en) * | 1978-10-16 | 1980-01-22 | Firma Carl Freudenberg | Process for the production of collagen fibers |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013001103A1 (fr) | 2011-06-28 | 2013-01-03 | Lanbide Heziketaren Lagunak, L.H.L | Procédé d'obtention de collagène à partir de la peau d'un animal |
| ITPO20120003A1 (it) * | 2012-03-13 | 2013-09-14 | Alessandro Fratini | Processo per la produzione di materie prime tessili derivanti da mischia di fibre tessili di varia natura con fibre tessili prodotte da collagene. |
| IT202100027044A1 (it) * | 2021-10-21 | 2023-04-21 | Roberto Dimaggio | Metodo per la realizzazione di un filo adatto alla tessitura e filo ottenuto |
| CN116065242A (zh) * | 2022-08-30 | 2023-05-05 | 石河子大学 | 可调节间隙的格条栅组及构成的籽棉清理机 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
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