NO803349L - PROCEDURE FOR MIXING STABLE FIBERS AND THE MANUFACTURED PRODUCT. - Google Patents
PROCEDURE FOR MIXING STABLE FIBERS AND THE MANUFACTURED PRODUCT.Info
- Publication number
- NO803349L NO803349L NO803349A NO803349A NO803349L NO 803349 L NO803349 L NO 803349L NO 803349 A NO803349 A NO 803349A NO 803349 A NO803349 A NO 803349A NO 803349 L NO803349 L NO 803349L
- Authority
- NO
- Norway
- Prior art keywords
- fibers
- heterofilaments
- homofilaments
- skein
- fuse
- Prior art date
Links
- 239000000835 fiber Substances 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 27
- 238000002156 mixing Methods 0.000 title claims description 11
- -1 polyethylene terephthalate Polymers 0.000 claims description 16
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 12
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 2
- 238000009960 carding Methods 0.000 description 8
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000002788 crimping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004744 fabric Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
- D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
- D01G1/06—Converting tows to slivers or yarns, e.g. in direct spinning
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4326—Condensation or reaction polymers
- D04H1/435—Polyesters
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
- D04H1/5412—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres sheath-core
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
- D04H1/5418—Mixed fibres, e.g. at least two chemically different fibres or fibre blends
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Multicomponent Fibers (AREA)
- Artificial Filaments (AREA)
- Nonwoven Fabrics (AREA)
Description
Denne oppfinnelse angår en fremgangsmåte for blanding av fibre av homogene og heterogene filamenter. Slike fibre benyttes i produksjon av ikke-vevede baner ved en kardeprosess. This invention relates to a method for mixing fibers of homogeneous and heterogeneous filaments. Such fibers are used in the production of non-woven webs by a carding process.
Dyktighet ved blanding av homo- og heterofilament fibre har en avgjørende innflytelse på egenskapene til en ikke-vevet bane av slike fibre. Skill in mixing homo- and heterofilament fibers has a decisive influence on the properties of a nonwoven web of such fibers.
Vanligvis blir blanding av slike fibre i stapelform utført som første trinn i en kardeprosess. Stapelfibrene fremstilles vanligvis ved trekking av en lunte av kontinuerlige homogene eller heterogene filamentfibre med etterfølgende krusing og kapping i passende stapellengder. Usually, mixing such fibers in staple form is carried out as the first step in a carding process. The staple fibers are usually produced by drawing a skein of continuous homogeneous or heterogeneous filament fibers with subsequent crimping and cutting into suitable staple lengths.
Det er nå funnet at visse fordeler kan oppnås ved å blande fibrene ved hjelp av en hy prosess uavhengig av kardeprosessen. It has now been found that certain advantages can be obtained by mixing the fibers by means of a hy process independent of the carding process.
Fremgangsmåten ifølge foreliggende oppfinnelse for blanding av stapelfibre går ut på forming av en kontinuerlig sammensatt lunte fra et antall homofilamentfibre og et antall heterofilamentfibre, strekking av lunten og kutting av den trukne lunte til stapelfibre. The method according to the present invention for mixing staple fibers involves forming a continuous composite skein from a number of homofilament fibers and a number of heterofilament fibers, stretching the skein and cutting the drawn skein into staple fibers.
I samsvar med fremgangsmåten ifølge oppfinnelsen oppnås også et ved hjelp av denne fremstilt produkt. In accordance with the method according to the invention, a product produced by means of this is also obtained.
Fremgangsmåter for produksjon av lunter fra et stort antall filamenter, vanligvis flere hundre, er tidligere kjent. Fi-lamentene dannes ved ekstrudering av smeltet polymer gjennom en trekkdyse med mange åpninger. Grupper av filamenter fra et antall trekkdyser føres sammen til en streng eller lunte. Lunten som benyttes ved fremgangsmåten ifølge oppfinnelsen dannes på Methods for the production of fuses from a large number of filaments, usually several hundred, are previously known. The filaments are formed by extruding molten polymer through a drawing die with many openings. Groups of filaments from a number of drawing nozzles are fed together into a string or fuse. The fuse used in the method according to the invention is formed on
en lignende måte ved at en eller flere trekkdyser produserer en eller flere grupper heterofilamenter og en eller flere trekkdyser produserer en eller flere grupper homofilamenter. a similar way in that one or more drawing nozzles produce one or more groups of heterofilaments and one or more drawing nozzles produce one or more groups of homofilaments.
Fremgangsmåten ifølge oppfinnelsen er spesielt egnet til blanding av homofilamentfibre av polymerer dannet av tereftalsyre. Den best kjente av disse er polyetylentereftalat. Heterofilamenter har en kjerne av en polymer basert på tereftalsyre, f.eks. polyetylentereftalat, og et overtrekk av en polymer, f.eks. polyetylenisoftalat eller polyetylentereftalat. The method according to the invention is particularly suitable for mixing homofilament fibers of polymers formed from terephthalic acid. The best known of these is polyethylene terephthalate. Heterofilaments have a core of a polymer based on terephthalic acid, e.g. polyethylene terephthalate, and a coating of a polymer, e.g. polyethylene isophthalate or polyethylene terephthalate.
Det er funnet at en blanding som er hensiktsmessig i pro-duksjonen av ikke-vevede baner, kan fremstilles ved fremgangsmåten ifølge oppfinnelsen ved benyttelse av en sammensatt lunte bestående av fra 5% til 95% med homofilamenter av polyetylen tereftalat, fra 95% til 5% heterofilamenter med en kjerne av polyetylentereftalat og et overtrekk av en kopolymer av polyetylenisoftalat og polyetylentereftalat. Slike stapelfiberblan-dinger kan lett omdannes til en ikke-vevet bane ved hjelp av en kardeprosess eventuelt etterfulgt av en kryssoverlapping eller en luftleggingsprosess. It has been found that a mixture which is appropriate in the production of non-woven webs can be produced by the method according to the invention using a composite fuse consisting of from 5% to 95% with homofilaments of polyethylene terephthalate, from 95% to 5 % heterofilaments with a core of polyethylene terephthalate and a coating of a copolymer of polyethylene isophthalate and polyethylene terephthalate. Such staple fiber mixtures can easily be converted into a non-woven web by means of a carding process possibly followed by a cross overlapping or an air laying process.
Den sammensatte lunte kan strekkes ved hjelp av en hvilken som helst prosess som frembringer en strukket lunte med stor ensartethet selv om både hetero- og homofilamenter er til stede i lunten. The composite skein can be drawn by any process which produces a drawn skein of high uniformity even though both hetero- and homofilaments are present in the skein.
En slik hensiktsmessig prosess er beskrevet i britisk patent 1 362 793. Such an appropriate process is described in British patent 1,362,793.
I nevnte britiske patent 1 362 793 er det beskrevet en prosess hvor lunten føres langs omkretsen av et antall etter hverandre anordnede materuller og trekkruller som roterer med en større hastighet. Lunten som er i kontakt med i det minste noen av materullene behandles med vann ved en temperatur over omgivelsestemperaturen, og strekkingen fullføres i hovedsak ved en temperatur som er den samme som vannet har før lunten forla-ter den siste materulle. In the aforementioned British patent 1 362 793, a process is described where the fuse is guided along the circumference of a number of successively arranged feed rollers and draw rollers which rotate at a greater speed. The fuse which is in contact with at least some of the feed rolls is treated with water at a temperature above the ambient temperature, and stretching is completed substantially at a temperature which is the same as the water before the fuse leaves the last feed roll.
Vanligvis utsettes den strukne lunte for en ytterligere behandling før den kappes til stapelfibre. Denne behandling tar sikte på å kruse hver enkelt fiber i lunten. Dette utføres hensiktsmessig som siste trinn under strekkingen ved bruk av en vanlig stukekruser. Usually, the drawn wick is subjected to a further treatment before it is cut into staple fibres. This treatment aims to crimp every single fiber in the fuse. This is suitably carried out as the last step during the stretching using a normal plastering mug.
En av fordelene ved den beskrevne fremgangsmåte for blanding er at den tillater full utnyttelse av strekkrammen. Full utnyttelse av strekkrammen krever optimal -luntestørrelse. I produksjon av stapelfibre for blanding ved hjelp av karding kan man ikke oppnå en slik størrelse med en ublandet lunte. Den sammensatte lunte ifølge fremgangsmåten er imidlertid langt større og tillater full utnyttelse av rammen. One of the advantages of the described method of mixing is that it allows full utilization of the tensile frame. Full utilization of the tensile frame requires optimal fuse size. In the production of staple fibers for blending by means of carding, such a size cannot be achieved with an unblended skein. The composite fuse according to the method is, however, far larger and allows full utilization of the frame.
En annen og kanskje viktigere fordel er at det på grunn av den effektive blanding som oppnås, kan det produseres baner av overlegen styrke. Another and perhaps more important advantage is that, because of the effective mixing achieved, webs of superior strength can be produced.
Oppfinnelsen skal nå bli beskrevet nærmere ved hjelp av følgende eksempler: The invention will now be described in more detail using the following examples:
Sammenligni ngseksemplerCompare examples
Det ble produsert stapelfibre av 67/33 kjerne/overtrekk heterofilamenter med en polyetylentereftalatkjerne og et overtrekk av 20 mol% polyetylenisoftalat/polyetylentereftalatkopo-lymer ved at det ble fremstilt lunte av et antall filamenter og strukket som beskrevet i britisk patent 1 362 793 med en påføl-gende stukebokskrusing og kutting med en Lummus-kutter til stapelfibre med lengde på 38 mm og tykkelse på 1,7 desitex. På tilsvarende måte ble det produsert stapelfibre med en lengde på 38 mm og tykkelse på 1,7 desitex av polyetylentereftalathomofilamenter. Staple fibers of 67/33 core/coating heterofilaments with a polyethylene terephthalate core and a coating of 20 mol% polyethylene isophthalate/polyethylene terephthalate copolymers were produced by making a skein of a number of filaments and stretching as described in British patent 1,362,793 with a -gent box crimping and cutting with a Lummus cutter for staple fibers with a length of 38 mm and a thickness of 1.7 decitex. In a similar manner, staple fibers with a length of 38 mm and a thickness of 1.7 decitex were produced from polyethylene terephthalate homofilaments.
Forskjellige blandinger ble dannet ved karding av heterofilament- og homofilamentfibre. I hvert tilfelle ble det produsert en ikke-vevet bane på ca. 25 g/m. Trådene ble punktforbundet i et sjakkbrettmønster på en Ramisch kalander ved en temperatur på 19 5°C ved et trykk på 5 tonn og med en hastighet på Different blends were formed by carding heterofilament and homofilament fibers. In each case, a non-woven web of approx. 25 g/m. The threads were dot-bonded in a checkerboard pattern on a Ramisch calender at a temperature of 195°C at a pressure of 5 tons and at a speed of
3 m/min.3 m/min.
Strekkfastheten (våt) av hver bundet bane ble målt i ma-skininnretningen og i tverretningen. Den gjennomsnittlige pro-duktstyrke normalisert til 25 g/m ble beregnet på bakgrunn av disse målingene. De oppnådde resultater ble satt opp som kurven A på diagrammet som viser gjennomsnittlig strekkstyrke mot pro-sentvis andel av heterofilamenter i produktet. The tensile strength (wet) of each bonded web was measured in the machine tool and in the transverse direction. The average product strength normalized to 25 g/m was calculated on the basis of these measurements. The results obtained were set up as curve A on the diagram showing the average tensile strength against the percentage of heterofilaments in the product.
Eksempler ifølge oppfinnelsen.Examples according to the invention.
Et antall kontinuerlige heterofilamenter ble blandet med et antall kontinuerlige polyetylentereftalathomofilamenter for dannelse av en sammensatt filamentlunte. A number of continuous heterofilaments were mixed with a number of continuous polyethylene terephthalate homofilaments to form a composite filament skein.
Forskjellige blandinger av heterofilamenter og homofilamenter ble benyttet og et antall sammensatte lunter ble fremstilt. Different mixtures of heterofilaments and homofilaments were used and a number of composite fuses were produced.
Luntene ble strukket etter den prosess som er beskrevet i GB-patent 1 362 793 med en etterfølgende stukekruseoperasjon og kutting til stapelfibre med en Lummus-kutter. Stapelfibrene hadde en lengde på 38 mm. Homofilamentene hadde en tykkelse på 2,0 desitex og heterofilamentene på 2,1 desitex. The fuses were stretched according to the process described in GB patent 1 362 793 with a subsequent splicing mug operation and cutting into staple fibers with a Lummus cutter. The staple fibers had a length of 38 mm. The homofilaments had a thickness of 2.0 decitex and the heterofilaments of 2.1 decitex.
Blandingene av stapelfibre ble formet til baner på ca.The mixtures of staple fibers were formed into webs of approx.
25 g/m ved hjelp av samme kardeprosess som ble benyttet i sammenligningseksemplene. 25 g/m using the same carding process as was used in the comparison examples.
Banene ble deretter punktforbundet etter samme sjakkbrett- mønster som ovenfor og med samme Ramisch-kalander ved en temperatur på 195°C, et trykk på 5 tonn og en hastighet på 3 m/min. The webs were then point-connected according to the same checkerboard pattern as above and with the same Ramisch calender at a temperature of 195°C, a pressure of 5 tons and a speed of 3 m/min.
Strekkfastheten (våt) av hver bundet bane ble målt i ma-skinretningen og i tverretningen. Den gjennomsnittlige strekkstyrke normalisert til 25 g/m ble så beregnet på bakgrunn av disse målinger. The tensile strength (wet) of each bonded web was measured in the fabric direction and in the transverse direction. The average tensile strength normalized to 25 g/m was then calculated on the basis of these measurements.
Fra de oppnådde resultater ble det trukket opp en kurve B på diagrammet som i det første eksempel. From the results obtained, a curve B was drawn on the diagram as in the first example.
Det antas at de oppnådde overlegne egenskaper er et resul-tat av at fibrene blandes på en strekkramme istedenfor i en kardeprosess. Dette er det motsatte av hva som skulle forventes ved en sammenligning av bestanddelene i banen fordi alle stapelfibre benyttet i sammenligningseksemplene hadde mindre desitex enn de stapelfibre som benyttet i eksempler ifølge oppfinnelsen. På grunn av det større antall fibre pr. vektenhet.i banen i det førstnevnte eksempel skulle man ha trodd at banene i disse eksem-ler skulle hatt større styrke enn den tilsvarende bane ifølge oppfinnelsen. It is assumed that the superior properties achieved are a result of the fibers being mixed on a stretching frame instead of in a carding process. This is the opposite of what would be expected from a comparison of the components in the web because all staple fibers used in the comparison examples had less decitex than the staple fibers used in examples according to the invention. Due to the greater number of fibers per unit of weight. in the web in the first-mentioned example, one would have thought that the webs in these examples would have had greater strength than the corresponding web according to the invention.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7940728 | 1979-11-26 | ||
| GB8005387 | 1980-02-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO803349L true NO803349L (en) | 1981-05-27 |
Family
ID=26273676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO803349A NO803349L (en) | 1979-11-26 | 1980-11-06 | PROCEDURE FOR MIXING STABLE FIBERS AND THE MANUFACTURED PRODUCT. |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0029666A1 (en) |
| AU (1) | AU6434880A (en) |
| DK (1) | DK502580A (en) |
| NO (1) | NO803349L (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4990594A (en) * | 1990-03-07 | 1991-02-05 | Hoechst Celanese Corporation | Producing a copolyester from a lower dialkyl ester of terephthalic acid, a glycol and a dicarboxylic acid |
| US5382400A (en) | 1992-08-21 | 1995-01-17 | Kimberly-Clark Corporation | Nonwoven multicomponent polymeric fabric and method for making same |
| US5405682A (en) | 1992-08-26 | 1995-04-11 | Kimberly Clark Corporation | Nonwoven fabric made with multicomponent polymeric strands including a blend of polyolefin and elastomeric thermoplastic material |
| US5336552A (en) | 1992-08-26 | 1994-08-09 | Kimberly-Clark Corporation | Nonwoven fabric made with multicomponent polymeric strands including a blend of polyolefin and ethylene alkyl acrylate copolymer |
| CA2092604A1 (en) | 1992-11-12 | 1994-05-13 | Richard Swee-Chye Yeo | Hydrophilic, multicomponent polymeric strands and nonwoven fabrics made therewith |
| US5482772A (en) | 1992-12-28 | 1996-01-09 | Kimberly-Clark Corporation | Polymeric strands including a propylene polymer composition and nonwoven fabric and articles made therewith |
| CN105155008A (en) * | 2015-09-14 | 2015-12-16 | 江苏乘鹰新材料股份有限公司 | Preparation method and special spinneret plate of stereo color elastic fiber |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1035908A (en) * | 1962-07-31 | 1966-07-13 | British Nylon Spinners Ltd | Improvements in or relating to methods and apparatus for the production of heterofilaments and heteroyarns |
| CH411213A (en) * | 1963-05-31 | 1966-04-15 | Bienz Ernst | Process for the production of a draftable spinnable staple fiber sliver and system for carrying out the process, as well as a draftable spinnable staple fiber sliver |
| US3593513A (en) * | 1967-09-05 | 1971-07-20 | Du Pont | Dyeing of mixed synthetic polymeric yarns |
| US3992499A (en) * | 1974-02-15 | 1976-11-16 | E. I. Du Pont De Nemours And Company | Process for sheath-core cospun heather yarns |
-
1980
- 1980-10-30 EP EP80303861A patent/EP0029666A1/en not_active Withdrawn
- 1980-11-06 NO NO803349A patent/NO803349L/en unknown
- 1980-11-13 AU AU64348/80A patent/AU6434880A/en not_active Abandoned
- 1980-11-26 DK DK502580A patent/DK502580A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU6434880A (en) | 1981-06-04 |
| DK502580A (en) | 1981-05-27 |
| EP0029666A1 (en) | 1981-06-03 |
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