CA1242557A - Process and apparatus for cospinning synthetic filament yarns consisting of two component yarns spun from identical or different polymers - Google Patents
Process and apparatus for cospinning synthetic filament yarns consisting of two component yarns spun from identical or different polymersInfo
- Publication number
- CA1242557A CA1242557A CA000473861A CA473861A CA1242557A CA 1242557 A CA1242557 A CA 1242557A CA 000473861 A CA000473861 A CA 000473861A CA 473861 A CA473861 A CA 473861A CA 1242557 A CA1242557 A CA 1242557A
- Authority
- CA
- Canada
- Prior art keywords
- yarns
- component
- yarn
- process according
- spinning
- 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.)
- Expired
Links
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
- D01D5/08—Melt spinning methods
- D01D5/082—Melt spinning methods of mixed yarn
-
- 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
- D01D7/00—Collecting the newly-spun products
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a process and an apparatus for cospinning synthetic filament yarns consisting of two component yarns, spun from identical or different polymers on a dual spinning position composed of two spinning positions arranged side by side. The apparatus comprises means for cooling the yarns, a convergence yarn guide for each component yarn, a means for combining pairs of component yarns, and a winding means. Each spinning position has at least one spinneret for at least two component yarns, and the winding means preferably consists of at least two winding devices.
The invention relates to a process and an apparatus for cospinning synthetic filament yarns consisting of two component yarns, spun from identical or different polymers on a dual spinning position composed of two spinning positions arranged side by side. The apparatus comprises means for cooling the yarns, a convergence yarn guide for each component yarn, a means for combining pairs of component yarns, and a winding means. Each spinning position has at least one spinneret for at least two component yarns, and the winding means preferably consists of at least two winding devices.
Description
~ 2:~255~7 The present invention, in one aspect, provides a process for melt cospinning partially oriented synthetic filament yarns consisting of at least two different polymers on a dual spinning position composed of at least a ~irst and 5 a second spinning position arranged side by side, wherein on the first spinning position a first polymer and on the second spinning position a second polymer are spun into at leas~ a first and a second component yarn, each of the two componen~
yarns is combined at a point of combination, and the resulting 10 combined yarns are wound up.
In this process, yarns spun at low or preferably high speed are prepared without drawing before w;nding.
The yarn spun at high speed ;s partially drawn and, if used ~` 15 as a textur;ng feed yarn, must be draw-textured. A par-r tially drawn yarn makes for a better texturing feed yarn than a fully drawn yarn. However, the yarn of the inven-tion can also be used as a smooth or drawn yarn.
To produce two component yarns, use is made of a 20 single spinneret having a sericircular arrangement of spin-neret holes. It is preferred to prepare four to eight com-ponent yarns per spinning pos;tion. In this case, use is made of two to four spinnerets which are arranged side by s;de, ;.e. ;n one l;ne ;n the case of four, six or eight 25 spinnerets, or in an arrangement where the spinnerets of one spinning position are in a line offset relative to the spinnerets of the other sp;nning position.
. ~, ,~.
Unlike U.S. Patent 4,025,595, the cospun fiLament yarns of the invention are only entangled/intermingled once, nameLy b'etween the point of combination and winding up.
Although the linear density of the product yarn is not critical, the yarns prepared have a final linear den-sity between 50 and 600 dtex, preferably between 50 and 260 dtex. The linear density of the individual filaments is likewise not critical.
The resulting filament yarns are LOY (low-oriented) yarns or POY (partially oriented) yarns, preferably POY, prepared at a take-up speed between ~,500 and 6,ûO0 m/min.
The component yarns are preferably wound up on two winding devices.
The synthetic polymers used are pure or modified poly-esters and/or nylons and/or polypropylenes or their copoly-mers. The nylons can be both nylon 6 and nylon 66 or their copolymers. Polyesters is to be understood as meaning polyesters prepared either by direct condensation of ethy-len'e glycol and terephthalic acid or by transesterification of dimethyl terephthalate with ethylene glycol and subse-quent polycondensation of the initially formed diglycol terephthalate. In place of ethylene glycol it is also pos-sible to use other diols, such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol or cyclohexanedimethanol, and in addition to terephthalic acid or its dimethyl ester, it is also possible to use other dicarboxylic acids, such as isophthalic acid, adipic acid, azelaic acid or dimeric ~.2~557 fatty acid or the alkyl esters of these acids.
The synthetic polymers of the component yarns can be not only polyester-polyester nylon-nylon or polypropy-lene-polypropylene combinations but also nylon-polyester nylon-polypropylene or polyester-poLypropylene combinations.
It is also possible to use combinations in which there is a certa;n difference in shrinkage between the two component yarns.
According to the invention it is also possible to prepare feed yarns for spunlike yarns. In this case the combination used can be for example of modified i.e.
regular- and basic-dyeable poLyesters. The basic-dyeable polyester contains a metal sulphonate such as the sulpho-nate of 3 5-isophthalic acid or the sulphonate of the di-rethyl ester of 3 5-;sophthalic acid. It is also possible to use a modified basic-dyeable polyester. In th;s case ;t 2ddit;0nally conta;ns a polyalkylene glycol or a polyole-fine, as described in Canadian Patent No. 1,225,191, Humbrecht et al., issued August 4, 1987 to Viscosuisse S.A.
2D The spunlike yarn of European Patent 22 û65 can also be prepared by the present invention. One spinning position then contains spinnerets hav;ng fine and coarser holes.
This component yarn forms the sheath component and that of the other spinning position forms the core component. If spunlike yarns are prepared the denier-specific stretching force ratio of the component yarns of the various polymers is greater than 2 for a reference stretch bet~een 1 : 1.2 ~25~7 and 1 : 2.
According to the inventior,, in the treatment of the component yarns from various polymers, the clamping length in the blowing cell is separately variable. The temperature of the blowing air, the pressure of the blowing air ~nd the humidity of the blo~ing air should be set in conventional manner and can likeuise be separately varied, as can the type and add-on level of spin finish.
The present invention also, in another aspect, provides apparatus for melt cospinninq partially oriented synthetic filament yarns consisting of two component yarns spun from two different polymers, which comprises two spinning positions arranged side by side, each of said spinning positions being linked with a metering pump and having at least one spinneret for at least two component yarns, means for cool.ing the yarns, a convergence yarn guide for each component yarn and for each of said spinning positions, said convergence yarn guides being positioned downstream of said spinning positions, means including eyelets for combining pairs of component yarns from different component yarn groups from both of said spinning positions, and means for winding up said combined pairs of two component yarns~
The means for combining the component yarns is an eyelet, a pin or a pigtail guide. The apparatus according to the invention preferably contains two to four spinnerets per spinning pos;tion. The apparatus could have 00re than four sp;nnerets, thereby reducing the outlay per spinning posit;on st;ll further.
The number of component yarns emerg;ng from each sp;nneret ;s not cr;tical; the number is preferably two, ,, - 6 - 124Z55~
since this arrangement ;s best known. However, it is per-fectly possible to vary this number up to three or four.
Between the point of convergence and the winding means the apparatus contains an interlacing jet, so that the resulting yarns, whose individual components are sepa-rately treated with spin finish at the convergence yarn guide, receive yarn cohesion.
As already mentioned above, each spinning position has a separate cooling treatment. The clamping length of 1û each cooling treatment is separately variable to obtain certain yarn properties. The length of the blowing cell for this treatment is for example between 1 and 2 m.
The invention firally relates to the use of the synthetic filament yarns consisting of two component yarns spun from identical or different polymers. These yarns can be used as such or be drawn and heat-treated, but are preferably textured or draw-textured, namely false-twist draw-textured.
The invention will now be illustrated in more detail by reference to the attached drawings, in which Figure 1 shows apparatus according to the invention with an arrangement of four spinnerets per spinning position, and Figure 2 shows the stretching force curves of two component yarns prepared according to the invention.
Coming from an extruder, not shown, the polymer melts of the separate polymers A and B arrive in the .~2~2SS~
respective metering pumps (3) and (4). The spinning position of polymer A is denoted with (1) and that of poLy-mer B with (2). The metering pumps (3) and (4) convey the respective polymers through, respectively, lines (5) and (6) into spinnerets (7) and (8). Each of these spinnerets has holes for two component yarns. These component yarns (9) and (10) solidify beneath the spinneret through the cooling action of the blowing air (C).
The clamping lengths of component yarns (9) and (10), i.e. the distance between the spinnerets (7) and (8) and the convergence yarn guides (11~ and (12), were chosen to be equal in the case of Figure 1. The treatment of component yarns with spin finish takes place at the convergence point (11) and (12). One component thread (9) and (10) of each of polymers A and B are then combined at the point of com-bination (13) and (14) into one yarn, which, on passing through the eyelet (15), is wound up on two winding devices (16) and (17). Each winding device (16) and (17), driven by motors (21) and (22), has on the respective mandrel (18) and (19) four full yarn windings (20).
Figure 2 shows the var;ation in stretching force (D) and (E) as a function of the stretching ratio L/LO, the take-in speed LO being kept constant at 100 m/min and the take-off speed L being correspondingly varied. The stretch takes place on a hot plate at 100C.
Curve (D) shows a basic-dyeable polyester component yarn and curve (E) a regular-dyeable polyester component 5'~
yarn of different linear densities, respectively 96 dtex and 144 dtex. The denier-specific stretching force ratio for a reference stretch of 1 : 1.4 is 4.8/1.2 = 4Ø
The invention is illustrated belo~ in more detail by means of an example.
Example Standard basic-dyeable and regular-dyeable poly-ester component yarns were prepared on the apparatus of Figure 1 using a take-off speed of 3,100 m/min. The spun yarn had a linear density of 150 dtex and 36 filaments, the basic-dyeable component yarn (A) having a linear density of 80 dtex and 16 filaments and the regular-dyeable component yarn (B) having a linear density of 70 dtex and 20 fila-ments. The clamping lengths for the components (A) and (B) are, respectively, 140 and 120 cm. After the point of com-bination the combined component yarns are entangled to a knot density of 7.4 knots/m.
The yarn properties of the yarn according to the invention are summarised in the table.
~24255~
_ 9 _ Table Yarn te~r strength 19 cN/tex Elongation at break 140 %
Denier-specific stretching force (A) 8.0 cN/tex Denier-specific stretching 2.5 cN/tex force (B) for a 1 : 1.7 stretch Ratio of A : B 3.2 -_ ~
On draw-texturing~ the yarn thus prepared results in a spunlike yarn which is used in weaving, flat-bed knitting and circular knitting.
yarns is combined at a point of combination, and the resulting 10 combined yarns are wound up.
In this process, yarns spun at low or preferably high speed are prepared without drawing before w;nding.
The yarn spun at high speed ;s partially drawn and, if used ~` 15 as a textur;ng feed yarn, must be draw-textured. A par-r tially drawn yarn makes for a better texturing feed yarn than a fully drawn yarn. However, the yarn of the inven-tion can also be used as a smooth or drawn yarn.
To produce two component yarns, use is made of a 20 single spinneret having a sericircular arrangement of spin-neret holes. It is preferred to prepare four to eight com-ponent yarns per spinning pos;tion. In this case, use is made of two to four spinnerets which are arranged side by s;de, ;.e. ;n one l;ne ;n the case of four, six or eight 25 spinnerets, or in an arrangement where the spinnerets of one spinning position are in a line offset relative to the spinnerets of the other sp;nning position.
. ~, ,~.
Unlike U.S. Patent 4,025,595, the cospun fiLament yarns of the invention are only entangled/intermingled once, nameLy b'etween the point of combination and winding up.
Although the linear density of the product yarn is not critical, the yarns prepared have a final linear den-sity between 50 and 600 dtex, preferably between 50 and 260 dtex. The linear density of the individual filaments is likewise not critical.
The resulting filament yarns are LOY (low-oriented) yarns or POY (partially oriented) yarns, preferably POY, prepared at a take-up speed between ~,500 and 6,ûO0 m/min.
The component yarns are preferably wound up on two winding devices.
The synthetic polymers used are pure or modified poly-esters and/or nylons and/or polypropylenes or their copoly-mers. The nylons can be both nylon 6 and nylon 66 or their copolymers. Polyesters is to be understood as meaning polyesters prepared either by direct condensation of ethy-len'e glycol and terephthalic acid or by transesterification of dimethyl terephthalate with ethylene glycol and subse-quent polycondensation of the initially formed diglycol terephthalate. In place of ethylene glycol it is also pos-sible to use other diols, such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol or cyclohexanedimethanol, and in addition to terephthalic acid or its dimethyl ester, it is also possible to use other dicarboxylic acids, such as isophthalic acid, adipic acid, azelaic acid or dimeric ~.2~557 fatty acid or the alkyl esters of these acids.
The synthetic polymers of the component yarns can be not only polyester-polyester nylon-nylon or polypropy-lene-polypropylene combinations but also nylon-polyester nylon-polypropylene or polyester-poLypropylene combinations.
It is also possible to use combinations in which there is a certa;n difference in shrinkage between the two component yarns.
According to the invention it is also possible to prepare feed yarns for spunlike yarns. In this case the combination used can be for example of modified i.e.
regular- and basic-dyeable poLyesters. The basic-dyeable polyester contains a metal sulphonate such as the sulpho-nate of 3 5-isophthalic acid or the sulphonate of the di-rethyl ester of 3 5-;sophthalic acid. It is also possible to use a modified basic-dyeable polyester. In th;s case ;t 2ddit;0nally conta;ns a polyalkylene glycol or a polyole-fine, as described in Canadian Patent No. 1,225,191, Humbrecht et al., issued August 4, 1987 to Viscosuisse S.A.
2D The spunlike yarn of European Patent 22 û65 can also be prepared by the present invention. One spinning position then contains spinnerets hav;ng fine and coarser holes.
This component yarn forms the sheath component and that of the other spinning position forms the core component. If spunlike yarns are prepared the denier-specific stretching force ratio of the component yarns of the various polymers is greater than 2 for a reference stretch bet~een 1 : 1.2 ~25~7 and 1 : 2.
According to the inventior,, in the treatment of the component yarns from various polymers, the clamping length in the blowing cell is separately variable. The temperature of the blowing air, the pressure of the blowing air ~nd the humidity of the blo~ing air should be set in conventional manner and can likeuise be separately varied, as can the type and add-on level of spin finish.
The present invention also, in another aspect, provides apparatus for melt cospinninq partially oriented synthetic filament yarns consisting of two component yarns spun from two different polymers, which comprises two spinning positions arranged side by side, each of said spinning positions being linked with a metering pump and having at least one spinneret for at least two component yarns, means for cool.ing the yarns, a convergence yarn guide for each component yarn and for each of said spinning positions, said convergence yarn guides being positioned downstream of said spinning positions, means including eyelets for combining pairs of component yarns from different component yarn groups from both of said spinning positions, and means for winding up said combined pairs of two component yarns~
The means for combining the component yarns is an eyelet, a pin or a pigtail guide. The apparatus according to the invention preferably contains two to four spinnerets per spinning pos;tion. The apparatus could have 00re than four sp;nnerets, thereby reducing the outlay per spinning posit;on st;ll further.
The number of component yarns emerg;ng from each sp;nneret ;s not cr;tical; the number is preferably two, ,, - 6 - 124Z55~
since this arrangement ;s best known. However, it is per-fectly possible to vary this number up to three or four.
Between the point of convergence and the winding means the apparatus contains an interlacing jet, so that the resulting yarns, whose individual components are sepa-rately treated with spin finish at the convergence yarn guide, receive yarn cohesion.
As already mentioned above, each spinning position has a separate cooling treatment. The clamping length of 1û each cooling treatment is separately variable to obtain certain yarn properties. The length of the blowing cell for this treatment is for example between 1 and 2 m.
The invention firally relates to the use of the synthetic filament yarns consisting of two component yarns spun from identical or different polymers. These yarns can be used as such or be drawn and heat-treated, but are preferably textured or draw-textured, namely false-twist draw-textured.
The invention will now be illustrated in more detail by reference to the attached drawings, in which Figure 1 shows apparatus according to the invention with an arrangement of four spinnerets per spinning position, and Figure 2 shows the stretching force curves of two component yarns prepared according to the invention.
Coming from an extruder, not shown, the polymer melts of the separate polymers A and B arrive in the .~2~2SS~
respective metering pumps (3) and (4). The spinning position of polymer A is denoted with (1) and that of poLy-mer B with (2). The metering pumps (3) and (4) convey the respective polymers through, respectively, lines (5) and (6) into spinnerets (7) and (8). Each of these spinnerets has holes for two component yarns. These component yarns (9) and (10) solidify beneath the spinneret through the cooling action of the blowing air (C).
The clamping lengths of component yarns (9) and (10), i.e. the distance between the spinnerets (7) and (8) and the convergence yarn guides (11~ and (12), were chosen to be equal in the case of Figure 1. The treatment of component yarns with spin finish takes place at the convergence point (11) and (12). One component thread (9) and (10) of each of polymers A and B are then combined at the point of com-bination (13) and (14) into one yarn, which, on passing through the eyelet (15), is wound up on two winding devices (16) and (17). Each winding device (16) and (17), driven by motors (21) and (22), has on the respective mandrel (18) and (19) four full yarn windings (20).
Figure 2 shows the var;ation in stretching force (D) and (E) as a function of the stretching ratio L/LO, the take-in speed LO being kept constant at 100 m/min and the take-off speed L being correspondingly varied. The stretch takes place on a hot plate at 100C.
Curve (D) shows a basic-dyeable polyester component yarn and curve (E) a regular-dyeable polyester component 5'~
yarn of different linear densities, respectively 96 dtex and 144 dtex. The denier-specific stretching force ratio for a reference stretch of 1 : 1.4 is 4.8/1.2 = 4Ø
The invention is illustrated belo~ in more detail by means of an example.
Example Standard basic-dyeable and regular-dyeable poly-ester component yarns were prepared on the apparatus of Figure 1 using a take-off speed of 3,100 m/min. The spun yarn had a linear density of 150 dtex and 36 filaments, the basic-dyeable component yarn (A) having a linear density of 80 dtex and 16 filaments and the regular-dyeable component yarn (B) having a linear density of 70 dtex and 20 fila-ments. The clamping lengths for the components (A) and (B) are, respectively, 140 and 120 cm. After the point of com-bination the combined component yarns are entangled to a knot density of 7.4 knots/m.
The yarn properties of the yarn according to the invention are summarised in the table.
~24255~
_ 9 _ Table Yarn te~r strength 19 cN/tex Elongation at break 140 %
Denier-specific stretching force (A) 8.0 cN/tex Denier-specific stretching 2.5 cN/tex force (B) for a 1 : 1.7 stretch Ratio of A : B 3.2 -_ ~
On draw-texturing~ the yarn thus prepared results in a spunlike yarn which is used in weaving, flat-bed knitting and circular knitting.
Claims (14)
1. Process for melt cospinning partially oriented synthetic filament yarns consisting of at least two different polymers on a dual spinning position composed of at least a first and a second spinning position arranged side by side,wherein on the first spinning position a first polymer and on the second spinning position a second polymer are spun into at least a first and a second component yarn, each of the two component yarns is combined at a point of combination, and the resulting combined yarns are wound up.
2. Process according to claim 1 wherein 2 to 8 component yarns are spun on each spinning position.
3. Process according to claim 1 wherein the component yarns are wound up at a speed of 2500-6000 m/min.
4. Process according to claim 1 wherein the polymers are selected from the group consisting of pure and modified polyesters, nylons and polypropylene and copolymers thereof.
5. Process according to claim 1 wherein the component yarns are wound up on at least two winding devices.
6. Process according to claim 1 wherein the combined component yarns are intermingled between the points of combination and the yarn windup.
7. Process according to claim 1 wherein each component of the two component yarn, separately stretched, has a denier specific stretching force, the ratio of which is greater than 2 for a reference draw ratio between 1:1.2 and 1:2.
8. Process according to claim 1 wherein the treatment of the first component yarns and of the second component yarns is effected by means of different clamping lengths in the blowing cell.
9. Process according to claim 1 wherein the treatment of the first component yarns and of the second component yarns is effected with an identical or different spin finish applied at an identical or different add-on level.
10. Process according to claim 1 including using said resulting yarns for texturing or draw-texturing.
11. Process according to claim 1 including using said resultant yarns as smooth yarn.
12. Apparatus for melt cospinning partially oriented synthetic filament yarns consisting of two component yarns spun from two different polymers, which comprises two spinning positions arranged side by side, each of said spinning positions being linked with a metering pump and having at least one spinneret for at least two component yarns, means for cooling the yarns, a convergence yarn guide for each component yarn and for each of said spinning positions, said convergence yarn guides being positioned downstream of said spinning positions, means including eyelets for combining pairs of component yarns from different component yarn groups from both of said spinning positions, and means for winding up said combined pairs of two component yarns.
13. Apparatus according to claim 12, wherein the spinnerets have at least two holes.
14. Apparatus according to claim 12, wherein for each yarn there is an interlacing jet between the points of combination and the eyelets.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH704/84-3 | 1984-02-14 | ||
| CH70484 | 1984-02-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1242557A true CA1242557A (en) | 1988-10-04 |
Family
ID=4193226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000473861A Expired CA1242557A (en) | 1984-02-14 | 1985-02-08 | Process and apparatus for cospinning synthetic filament yarns consisting of two component yarns spun from identical or different polymers |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0172181B1 (en) |
| JP (1) | JPS62501221A (en) |
| BR (1) | BR8506042A (en) |
| CA (1) | CA1242557A (en) |
| DE (1) | DE3563859D1 (en) |
| IT (1) | IT1182197B (en) |
| WO (1) | WO1985003728A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1226160B (en) * | 1988-07-06 | 1990-12-19 | Filteco Spa | METHOD AND EQUIPMENT FOR THE PRODUCTION OF YARN WITH MULTIPLE FILAMENTS. |
| FR2674261B1 (en) * | 1991-03-19 | 1993-06-11 | Vetrotex France Sa | METHOD AND DEVICE FOR MANUFACTURING A COMPOSITE YARN. |
| JPH09310220A (en) * | 1996-05-17 | 1997-12-02 | Ind Technol Res Inst | Production of heteroshrinkable blended filament yarn |
| NL1033314C2 (en) * | 2007-01-31 | 2008-08-01 | Ten Cate Thiolon Bv | Composite synthetic yarn production apparatus, comprises extrusion lines for supplying property specific, stretched filaments to unit where they are combined with each other |
| CN105401238A (en) * | 2015-12-18 | 2016-03-16 | 江苏昊星化纤纺织有限公司 | Nylon 66 double-head winding device |
| BE1024237B9 (en) * | 2016-06-01 | 2018-01-23 | Nv Michel Van De Wiele | DEVICE FOR MANUFACTURING YARN, METHOD FOR MANUFACTURING YARN AND METHOD FOR ADJUSTING A DEVICE FOR MANUFACTURING YARN |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1805954A1 (en) * | 1968-10-30 | 1970-06-11 | Bayer Ag | Melange thread |
| JPS517203A (en) * | 1974-07-10 | 1976-01-21 | Sadayoshi Watanabe | Arukariekifurikakeo tokuchotosuru kapponkashokubutsuparupuno sansosankaseizoho |
| US4025595A (en) * | 1975-10-15 | 1977-05-24 | E. I. Du Pont De Nemours And Company | Process for preparing mixed filament yarns |
| US4247505A (en) * | 1978-05-05 | 1981-01-27 | Phillips Petroleum Company | Melt spinning of polymers |
| JPS59130309A (en) * | 1983-01-14 | 1984-07-26 | Teijin Ltd | Production of yarn mix of different shrinkage |
-
1985
- 1985-02-07 EP EP85900622A patent/EP0172181B1/en not_active Expired
- 1985-02-07 WO PCT/CH1985/000022 patent/WO1985003728A1/en not_active Application Discontinuation
- 1985-02-07 JP JP60500619A patent/JPS62501221A/en active Pending
- 1985-02-07 BR BR8506042A patent/BR8506042A/en unknown
- 1985-02-07 DE DE8585900622T patent/DE3563859D1/en not_active Expired
- 1985-02-08 CA CA000473861A patent/CA1242557A/en not_active Expired
- 1985-02-13 IT IT47679/85A patent/IT1182197B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| WO1985003728A1 (en) | 1985-08-29 |
| IT1182197B (en) | 1987-09-30 |
| DE3563859D1 (en) | 1988-08-25 |
| BR8506042A (en) | 1986-03-25 |
| JPS62501221A (en) | 1987-05-14 |
| IT8547679A0 (en) | 1985-02-13 |
| EP0172181A1 (en) | 1986-02-26 |
| IT8547679A1 (en) | 1986-08-13 |
| EP0172181B1 (en) | 1988-07-20 |
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