CA2067672A1 - Method and apparatus for spinning bicomponent filaments and products produced therefrom - Google Patents
Method and apparatus for spinning bicomponent filaments and products produced therefromInfo
- Publication number
- CA2067672A1 CA2067672A1 CA 2067672 CA2067672A CA2067672A1 CA 2067672 A1 CA2067672 A1 CA 2067672A1 CA 2067672 CA2067672 CA 2067672 CA 2067672 A CA2067672 A CA 2067672A CA 2067672 A1 CA2067672 A1 CA 2067672A1
- Authority
- CA
- Canada
- Prior art keywords
- polymer
- sheath
- core
- spinneret
- distributor
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000009987 spinning Methods 0.000 title abstract description 14
- 229920000642 polymer Polymers 0.000 claims abstract description 63
- 229920000728 polyester Polymers 0.000 claims abstract 4
- 239000000835 fiber Substances 0.000 claims description 12
- ISPYQTSUDJAMAB-UHFFFAOYSA-N 2-chlorophenol Chemical compound OC1=CC=CC=C1Cl ISPYQTSUDJAMAB-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000002074 melt spinning Methods 0.000 claims 1
- 238000000429 assembly Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 101710200896 Acyl-CoA thioesterase 2 Proteins 0.000 description 1
- 229910001369 Brass Inorganic materials 0.000 description 1
- 241000700143 Castor fiber Species 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 101100083192 Streptomyces coeruleorubidus pacX gene Proteins 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Multicomponent Fibers (AREA)
Abstract
ABSTRACT
A method and apparatus for spinning eccentric bicomponent sheath/core filaments using a sheath polymer of polyester having a low intrinsic viscosity and a core polymer having a higher intrinsic viscosity.
A method and apparatus for spinning eccentric bicomponent sheath/core filaments using a sheath polymer of polyester having a low intrinsic viscosity and a core polymer having a higher intrinsic viscosity.
Description
~13~3~
METHOD AND APPARATUS FOR SPINNING BICOMPONENT FILAMENTS
AND PRODUCTS PRODUCED THEREFROM
The present application is a continuation-in-part of patent application Serial No. 454,217 filed ~ecember 21, 1989.
This inven~ion relates to a method and apparatus for spinning bicomponent filaments and the improved products produced therefrom. Further, this invention relates to a method and apparatus for spinning improved bicomponent filaments in eccentric sheath/core relationships.
Backqround Bicomponent filaments of the sheath/core configuration are well known and a variety of spinning packs and spinnerets have been employed in the production of such filaments. A conventional spinning assembly involves feeding the sheath-forming material to the spinneret ori~ices in a direction perpendicular to the oriflce~, and in~ecting the core-forming material into the sheath-~orming material as it flowa into the spinneret orifices.
A bicomponent spinning assembly i9 disclosed in U.S.
4,406,850 whereby molten sheath polymer i8 issued in ribbon flow into recessed slot-like portions of the top surface of the spinneret positioned between rows of raised spinneret core inlets.
U.S. 4,251,200 also discloses a bicomponent spinning assembly comprising a spinneret plate and a distribution plate spaced apart, the distributor plate having an aperture opposite each orifice in the spinneret plate and a plateau-like protrusion hJ ~ 3 extending about the axis common to aperture and the extrusion orifice. Additionally, the assembly includes an orifice plate ~or restricting the entrance to the orifice.
The concentricity of the core and sheath capillaries in the prior art spinning assemblies as described above and in other spinning assemblies is not satisfactory. It is difficult to properly position the distributor plate and the spinneret of the prior art assemblies so that proper alignment of the distributor and flow passages and pressure drop control are obtained so as to produce sheath/core bicomponent fibers of uniform cross section.
Typical o~ spinning assemblies of the prior art as exemplified by the cited references, the gap between the exit sur~ace of the distributor and the inlet surface of the spinneret is ~ixed. Thus, if the sheath polymer viscosity varies or the core sheath ratio changes, the pressure drop control in the prior art assembliQ~ is lost. It i9 nacessary to control sheath polymer pre~sure drop ad~acent the spinneret inlet as will be hereafter discussed to obtain bicomponent fibers consistent from filament to ~ilament.
Further, in those spinning assemblies where the annular gap between the distributor and spinneret is ~ixed, polymer pressure is suf~icient at times to bow the spinneret away from the distributor thereby opening up the gap and changing the pressure drop. The exit and inlet passages o~ the distributor and r~ ~ 7 spinneret, respectively, nearest the center and the source of the sheath polymer will have the widest gaps and those farthest from the center will have the narrowest gap. Sheath polymer will flow preferentially to the inner passages providing poor bicomponent filament uniformity.
Invention By the invention there is provided an improved process and apparatus for the production of improved, bicomponent sheath/core filaments of uniform cross section whereby the spinning pack assembly can be readily adjusted to compensate for changes in sheath polymer viscosity and changes in polymer flux and the sheath polym-r ~low to each spinneret core polymer flow passage can be controlled separately. In particular, an eccentric sheath/core filament is produced having self-crimping properties.
Brief De~¢ription o~ the Drawinas Flgure 1 ls a view in perspectlve of a spin pacX assembly e~bodlment of the invention.
Flgure 2 is a vertical sectlon of a multlple passage distrlbutor/shlm/~plnneret assembly Flgure 3 is a vertical section of a distributor/shim/
splnneret assembly to produce eccentrlc bicomponent filaments ~ , Description of Preferred Embodiments Referring to the accompanying drawings and more specifically to Fig. 1, a bicomponent filament spin pack assembly can be fabricated from a distributor lo, a shim 11 and a spinneret 12.
Distributor 10 is positioned so as to receive a melt-extruded sheath polymer or a sheath polymer in solution through a channel 13 and a melt-extruded core polymer or core polymer in solution through channel 14. Each of the sheath and core polymers are passed to the respective channels 13 and 14 by conventional melt extrusion, pump and filter means not herein illustrated.
The distributor 10 functions to form the core polymer into ~ilament~ and to channel the flow of sheath polymer to spinneret 12. The core polymer is pumped through multiple passages 16 to the lower, even surface of distributor 10. Passages 16 can be arranged in any number of rows or columns depending upon their size, the viscosity Or the core polymer, the length of passages 16 and the ~low characteristics o~ the particular core polymer. The bottom o~ each passage 16 is tapered to provide a core filament of the desired diameter. Although not to be limited thereto, the density o~ passages 16 in distributor 10 when, for example, the core polymer is melted polyethylene terephthalate and the exit passage diamster is in the range from 0.1 millimeter (mm) to 1.0 mm, can be such that each passage utilizes 10 square mm of the spinneret area.
Sheath polymer flowing through channel 13 is pumped to passages 17 and through passages 17 to spinneret 12. Although not to be limited thPreto, the passages 17 are preferably axially positioned in distributor 10 so that upon exiting passages 17 the sheath poly~er will flow radially outwardly toward the inlets o~
passages 22.
A shim 11 is positioned between distributor 10 and spinneret 12 and maintained in fixed relationship to distributor 10 and spinneret 12 by dowels-pins 19 engaging threaded reces6es 20 in distributor 10. Distributor 10 and spinneret 12 are relatively positioned by dowel pin~ 18. In order to overcome bowing and separation o~ distributor 10 and spinneret 12 which can occur in the operation of conventional spin pack assemblies, a ring of bolts 19 ha~ been positioned in the center of the assembly as shown in Figure 2. The shlm can be ~abricated from a variety of materials such as stainles~ steel or brass with stainless steel being pre~erred. The shim can be constructed as a single unit or in two separate inner and outer plece~. The number and positioning of bolts 19 is such as to control deflection, preferably limiting deflection to less than .002 ~m.
Shim 11 must be of substantially constant thickness, preferably having a variance in thickness of less than .002 mm and the circular openings 21 must be in proper alignment with distributor passages 16 and spinneret passages 22. Shims 11 of different thicknesses, normally ranglng from .025 to 0.50 mm, are employed to adjust for changes in sheath polymer viscosity, changes in polymer flux or to change the pressure drop as will be hereafter discussed.
The top smooth, even surface of the spinneret 12 is recessed, providing a channel 23 for the flow of sheath polymer to each passage 22. Raised circular portions or buttons 24 surround each passage ~2. The raised portions or buttons 24 project upwardly from channel 23 to a height which is equal to the top surface 25 of spinneret 12. The rate of outward flow of sheath polymer through channel 23 and over the buttons 24 to passages 22 is a result o~ the pressure drop determined by the thickness of shim 11. The pressure drop is inversely proportioned to the third power of the height of the gap 26 between distributor lO and spinneret 12. Close control o~ this gap height is effected by shim 11 and maintained by the inner and outer circle of bolt~ 19.
The reces~ depth o~ channel 23 is selected so as to provide a low pressure drop ~normally 20-50 psi) radially across the top of the spinneret. The shim thickness is selected to normally provide a 100-1000 p8i pressure drop across the raised buttons 24.
As will be evident ~rom the drawings, each passage 22 mu~t be in concentric alignment with its corresponding passage 16. The core polymer ~lows through passages 16 and passages 22, exiting spinneret 12 as the core o~ a bicomponent fiber. The sheath polymer ~lows through passages 17, channel 23 and gap 26 to fsJ ~ !3 ~ ~ ~J f~,, form a sheath about the filament of core polymer producing the aforementioned bicomponent fiber. The center axis of distributor passage 16 should be within a circle having a radius less than 200 microns, preferably less than 50 microns from the center axis of the spinneret counterbore.
The production of eccentric sheath/core fibers is illustrated in Figure 3. The holes in shim 11 are positioned so as to restrict the f 7 OW of sheath polymer 33 in the manner illustrated.
The eccentric cross section of the formed bicomponent filament is also illustrated in Figure 3.
The bicomponent sheath/core filaments produced by the spinneret assembly of the invention are of uniform cross section from filament to ~ilament. The core and sheath of each filament will have sub~tantially the same cross sectional shape and area.
PrefQrably, the diameter coefficient of variability for the blcomponent fibers o~ this invention will be less than 2.50% based upon dlameter measurements o~ at least twenty-five simultaneously produced filaments. The coefficient of variability (CV1 is determined by:
CV ~ Standard deviation of the filament diameter x lO0 Mean filament diameter The eccentricity coef~icient of variability for twenty-five simultaneously produced concentric bicomponent filaments of the invention will preferably be less than 1.0%. The eccentricity coefficient variabilitv (ECV) is determined by the following relationship:
ECV = Dis~lacement of core center x lOO
~icomponent filamenter diameter Normally, the diameter coefficient of variability for co~mercially produced sheath/core bicomponent filaments will exceed 4.5% and the eccentricity coefficient of variability for concentric sheath/core bicomponent filaments will exceed 6.00%.
The invention will hereafter be described as it relates to the production of sheath/core eccentric bicomponent fibers wherein the sheath polymer comprises a melted polyethylene terephthalate having an intrinsic viscosity of about 0.485 deciliters/gm in the solvent base orthochlorophenol at 25 C and the core polymsr comprises a melted polyethylene terephthalate having an intrinsic viscosity o~ about 0.70 deciliters/gm in the solvent base orthochlorophenol at 25 C.
EXAMPLE I
The spinneret assembly of Figure 1 having spinneret hole diameters of O.375 mm for Experiment l and O.565 mm (Experiments 2 and 3) were used to spin eccentric bicomponent sheath/core filaments with core sheath ratios of 50:50 weight percent. The melted sheath polymer was passed to passages 17 at a temperature of 285-C. The melted core polymer was passed to passages 16 at a temperature of 285 c. The throughput per spinneret hole was 0.762, 1.375 and 1.375 g/min, respectively.
The bicomponent filaments were air quenched with 25 - 30 C
air and wound up at a speed of 2092 fpm for Experiment 1 and 2400 for Experiments 2 and 3. The resulting filaments were then drawn at a draw ratio of 3.05 at 70 C. Fibers from Experiments 1, 2 and part of 3 were crimped in a conventional stuffer box. The crimp development of the remaining fibers of Experiment 3 was allowed to develop with the assistance of an air ejector. After heat setting at 150 C - 170 C, the filaments were cut to 2 and 3 inch fiber lengths and the properties are shown below in Table I.
TABLE I
STRESS ~T
SPEClrlED CPIIIPS PER
Delllell PER EUXIC~TION INCH
FIL~EIIT ~DPF) TEII~ClTr % ELCI~G. ~lOO ~CPI) X CRIMP
~STM ~ ~STM ~ ~An~ STM ~ ~STM ~ ~ASTM ~
EXPE~IIMEIIT D~2101~82) D~2101~82) D~2101~82) D~2102~82) D~3937~8Z2 D~3937~82) 4.4 3.1 77 1.011 1Z.3 33 2 6.5 3.3 67 1.16 a.s 40 3 6.7 3.1 73 1.1Z 8 28 Th- spinneret assembly o~ the invention can be employed to produce solutlon spun bicomponent ~ilaments. By ad~usting the pack dimensions and polymer solution vlscosities, bicomponent ~ilaments ~rom, ~or example, cellulose acetate and viscose could be produced.
. ..
.
~ 5 ~ . r The principles, preferred embodiments and modes of operation of the present invention have been described in the foregoing specificatiOn~ The invention which is intended to be protected herein, however, is not to be construed as limited to the particular forms disclosed since those are to be regarded as illustrative rather than restricti~e. Variations and changes may be made by those skilled in the art without departing from the spirit of t~e invention.
METHOD AND APPARATUS FOR SPINNING BICOMPONENT FILAMENTS
AND PRODUCTS PRODUCED THEREFROM
The present application is a continuation-in-part of patent application Serial No. 454,217 filed ~ecember 21, 1989.
This inven~ion relates to a method and apparatus for spinning bicomponent filaments and the improved products produced therefrom. Further, this invention relates to a method and apparatus for spinning improved bicomponent filaments in eccentric sheath/core relationships.
Backqround Bicomponent filaments of the sheath/core configuration are well known and a variety of spinning packs and spinnerets have been employed in the production of such filaments. A conventional spinning assembly involves feeding the sheath-forming material to the spinneret ori~ices in a direction perpendicular to the oriflce~, and in~ecting the core-forming material into the sheath-~orming material as it flowa into the spinneret orifices.
A bicomponent spinning assembly i9 disclosed in U.S.
4,406,850 whereby molten sheath polymer i8 issued in ribbon flow into recessed slot-like portions of the top surface of the spinneret positioned between rows of raised spinneret core inlets.
U.S. 4,251,200 also discloses a bicomponent spinning assembly comprising a spinneret plate and a distribution plate spaced apart, the distributor plate having an aperture opposite each orifice in the spinneret plate and a plateau-like protrusion hJ ~ 3 extending about the axis common to aperture and the extrusion orifice. Additionally, the assembly includes an orifice plate ~or restricting the entrance to the orifice.
The concentricity of the core and sheath capillaries in the prior art spinning assemblies as described above and in other spinning assemblies is not satisfactory. It is difficult to properly position the distributor plate and the spinneret of the prior art assemblies so that proper alignment of the distributor and flow passages and pressure drop control are obtained so as to produce sheath/core bicomponent fibers of uniform cross section.
Typical o~ spinning assemblies of the prior art as exemplified by the cited references, the gap between the exit sur~ace of the distributor and the inlet surface of the spinneret is ~ixed. Thus, if the sheath polymer viscosity varies or the core sheath ratio changes, the pressure drop control in the prior art assembliQ~ is lost. It i9 nacessary to control sheath polymer pre~sure drop ad~acent the spinneret inlet as will be hereafter discussed to obtain bicomponent fibers consistent from filament to ~ilament.
Further, in those spinning assemblies where the annular gap between the distributor and spinneret is ~ixed, polymer pressure is suf~icient at times to bow the spinneret away from the distributor thereby opening up the gap and changing the pressure drop. The exit and inlet passages o~ the distributor and r~ ~ 7 spinneret, respectively, nearest the center and the source of the sheath polymer will have the widest gaps and those farthest from the center will have the narrowest gap. Sheath polymer will flow preferentially to the inner passages providing poor bicomponent filament uniformity.
Invention By the invention there is provided an improved process and apparatus for the production of improved, bicomponent sheath/core filaments of uniform cross section whereby the spinning pack assembly can be readily adjusted to compensate for changes in sheath polymer viscosity and changes in polymer flux and the sheath polym-r ~low to each spinneret core polymer flow passage can be controlled separately. In particular, an eccentric sheath/core filament is produced having self-crimping properties.
Brief De~¢ription o~ the Drawinas Flgure 1 ls a view in perspectlve of a spin pacX assembly e~bodlment of the invention.
Flgure 2 is a vertical sectlon of a multlple passage distrlbutor/shlm/~plnneret assembly Flgure 3 is a vertical section of a distributor/shim/
splnneret assembly to produce eccentrlc bicomponent filaments ~ , Description of Preferred Embodiments Referring to the accompanying drawings and more specifically to Fig. 1, a bicomponent filament spin pack assembly can be fabricated from a distributor lo, a shim 11 and a spinneret 12.
Distributor 10 is positioned so as to receive a melt-extruded sheath polymer or a sheath polymer in solution through a channel 13 and a melt-extruded core polymer or core polymer in solution through channel 14. Each of the sheath and core polymers are passed to the respective channels 13 and 14 by conventional melt extrusion, pump and filter means not herein illustrated.
The distributor 10 functions to form the core polymer into ~ilament~ and to channel the flow of sheath polymer to spinneret 12. The core polymer is pumped through multiple passages 16 to the lower, even surface of distributor 10. Passages 16 can be arranged in any number of rows or columns depending upon their size, the viscosity Or the core polymer, the length of passages 16 and the ~low characteristics o~ the particular core polymer. The bottom o~ each passage 16 is tapered to provide a core filament of the desired diameter. Although not to be limited thereto, the density o~ passages 16 in distributor 10 when, for example, the core polymer is melted polyethylene terephthalate and the exit passage diamster is in the range from 0.1 millimeter (mm) to 1.0 mm, can be such that each passage utilizes 10 square mm of the spinneret area.
Sheath polymer flowing through channel 13 is pumped to passages 17 and through passages 17 to spinneret 12. Although not to be limited thPreto, the passages 17 are preferably axially positioned in distributor 10 so that upon exiting passages 17 the sheath poly~er will flow radially outwardly toward the inlets o~
passages 22.
A shim 11 is positioned between distributor 10 and spinneret 12 and maintained in fixed relationship to distributor 10 and spinneret 12 by dowels-pins 19 engaging threaded reces6es 20 in distributor 10. Distributor 10 and spinneret 12 are relatively positioned by dowel pin~ 18. In order to overcome bowing and separation o~ distributor 10 and spinneret 12 which can occur in the operation of conventional spin pack assemblies, a ring of bolts 19 ha~ been positioned in the center of the assembly as shown in Figure 2. The shlm can be ~abricated from a variety of materials such as stainles~ steel or brass with stainless steel being pre~erred. The shim can be constructed as a single unit or in two separate inner and outer plece~. The number and positioning of bolts 19 is such as to control deflection, preferably limiting deflection to less than .002 ~m.
Shim 11 must be of substantially constant thickness, preferably having a variance in thickness of less than .002 mm and the circular openings 21 must be in proper alignment with distributor passages 16 and spinneret passages 22. Shims 11 of different thicknesses, normally ranglng from .025 to 0.50 mm, are employed to adjust for changes in sheath polymer viscosity, changes in polymer flux or to change the pressure drop as will be hereafter discussed.
The top smooth, even surface of the spinneret 12 is recessed, providing a channel 23 for the flow of sheath polymer to each passage 22. Raised circular portions or buttons 24 surround each passage ~2. The raised portions or buttons 24 project upwardly from channel 23 to a height which is equal to the top surface 25 of spinneret 12. The rate of outward flow of sheath polymer through channel 23 and over the buttons 24 to passages 22 is a result o~ the pressure drop determined by the thickness of shim 11. The pressure drop is inversely proportioned to the third power of the height of the gap 26 between distributor lO and spinneret 12. Close control o~ this gap height is effected by shim 11 and maintained by the inner and outer circle of bolt~ 19.
The reces~ depth o~ channel 23 is selected so as to provide a low pressure drop ~normally 20-50 psi) radially across the top of the spinneret. The shim thickness is selected to normally provide a 100-1000 p8i pressure drop across the raised buttons 24.
As will be evident ~rom the drawings, each passage 22 mu~t be in concentric alignment with its corresponding passage 16. The core polymer ~lows through passages 16 and passages 22, exiting spinneret 12 as the core o~ a bicomponent fiber. The sheath polymer ~lows through passages 17, channel 23 and gap 26 to fsJ ~ !3 ~ ~ ~J f~,, form a sheath about the filament of core polymer producing the aforementioned bicomponent fiber. The center axis of distributor passage 16 should be within a circle having a radius less than 200 microns, preferably less than 50 microns from the center axis of the spinneret counterbore.
The production of eccentric sheath/core fibers is illustrated in Figure 3. The holes in shim 11 are positioned so as to restrict the f 7 OW of sheath polymer 33 in the manner illustrated.
The eccentric cross section of the formed bicomponent filament is also illustrated in Figure 3.
The bicomponent sheath/core filaments produced by the spinneret assembly of the invention are of uniform cross section from filament to ~ilament. The core and sheath of each filament will have sub~tantially the same cross sectional shape and area.
PrefQrably, the diameter coefficient of variability for the blcomponent fibers o~ this invention will be less than 2.50% based upon dlameter measurements o~ at least twenty-five simultaneously produced filaments. The coefficient of variability (CV1 is determined by:
CV ~ Standard deviation of the filament diameter x lO0 Mean filament diameter The eccentricity coef~icient of variability for twenty-five simultaneously produced concentric bicomponent filaments of the invention will preferably be less than 1.0%. The eccentricity coefficient variabilitv (ECV) is determined by the following relationship:
ECV = Dis~lacement of core center x lOO
~icomponent filamenter diameter Normally, the diameter coefficient of variability for co~mercially produced sheath/core bicomponent filaments will exceed 4.5% and the eccentricity coefficient of variability for concentric sheath/core bicomponent filaments will exceed 6.00%.
The invention will hereafter be described as it relates to the production of sheath/core eccentric bicomponent fibers wherein the sheath polymer comprises a melted polyethylene terephthalate having an intrinsic viscosity of about 0.485 deciliters/gm in the solvent base orthochlorophenol at 25 C and the core polymsr comprises a melted polyethylene terephthalate having an intrinsic viscosity o~ about 0.70 deciliters/gm in the solvent base orthochlorophenol at 25 C.
EXAMPLE I
The spinneret assembly of Figure 1 having spinneret hole diameters of O.375 mm for Experiment l and O.565 mm (Experiments 2 and 3) were used to spin eccentric bicomponent sheath/core filaments with core sheath ratios of 50:50 weight percent. The melted sheath polymer was passed to passages 17 at a temperature of 285-C. The melted core polymer was passed to passages 16 at a temperature of 285 c. The throughput per spinneret hole was 0.762, 1.375 and 1.375 g/min, respectively.
The bicomponent filaments were air quenched with 25 - 30 C
air and wound up at a speed of 2092 fpm for Experiment 1 and 2400 for Experiments 2 and 3. The resulting filaments were then drawn at a draw ratio of 3.05 at 70 C. Fibers from Experiments 1, 2 and part of 3 were crimped in a conventional stuffer box. The crimp development of the remaining fibers of Experiment 3 was allowed to develop with the assistance of an air ejector. After heat setting at 150 C - 170 C, the filaments were cut to 2 and 3 inch fiber lengths and the properties are shown below in Table I.
TABLE I
STRESS ~T
SPEClrlED CPIIIPS PER
Delllell PER EUXIC~TION INCH
FIL~EIIT ~DPF) TEII~ClTr % ELCI~G. ~lOO ~CPI) X CRIMP
~STM ~ ~STM ~ ~An~ STM ~ ~STM ~ ~ASTM ~
EXPE~IIMEIIT D~2101~82) D~2101~82) D~2101~82) D~2102~82) D~3937~8Z2 D~3937~82) 4.4 3.1 77 1.011 1Z.3 33 2 6.5 3.3 67 1.16 a.s 40 3 6.7 3.1 73 1.1Z 8 28 Th- spinneret assembly o~ the invention can be employed to produce solutlon spun bicomponent ~ilaments. By ad~usting the pack dimensions and polymer solution vlscosities, bicomponent ~ilaments ~rom, ~or example, cellulose acetate and viscose could be produced.
. ..
.
~ 5 ~ . r The principles, preferred embodiments and modes of operation of the present invention have been described in the foregoing specificatiOn~ The invention which is intended to be protected herein, however, is not to be construed as limited to the particular forms disclosed since those are to be regarded as illustrative rather than restricti~e. Variations and changes may be made by those skilled in the art without departing from the spirit of t~e invention.
Claims (7)
1. In a filament spinneret assembly for the production of eccentric sheath/core bicomponent filaments which comprises a distributor having a plurality of spaced core polymer flow passages and multiple sheath polymer flow passages, a spinneret having a plurality of spaced core polymer flow passages and multiple sheath polymer flow passages, each said spinneret core polymer passage in axial alignment with the outlet of the respective core distributor flow passage, core polymer supply means for delivery of pressurized polymer to the inlet of each said distributor core polymer flow passage, and sheath polymer supply means for delivery of pressurized sheath polymer to the inlet of each said sheath polymer flow passage; the improvement which comprises a shim means positioned between said spinneret and said distributor for spacing said spinneret from said distributor and for controlling the sheath polymer flow from the outlet of said distributor sheath polymer flow passages to the inlet of each said spinneret core polymer flow passage separately to form eccentric sheath/core bicomponent fibers wherein the sheath polymer is a polyester having an intrinsic viscosity of about 0.485 deciliters/gm in a solvent base of orthochlorophenol at 25°
C and the core polymer is a polyester having an intrinsic viscosity of 0.685 deciliters/gm in a solvent base of orthochlorophenol at 25° C.
C and the core polymer is a polyester having an intrinsic viscosity of 0.685 deciliters/gm in a solvent base of orthochlorophenol at 25° C.
2. The spin-pack of claim 1 wherein the top spinneret surface containing said spaced core polymer passage inlets also contains sheath polymer channels, said shim means being positioned to effect a controlled pressure drop between each of said channels and adjacent spinneret flow passage inlets.
3. The spin-pack of claim 2 wherein said sheath polymer is caused to flow radially outwardly through said channels to each of said spinneret core polymer passage inlets.
4. The method of melt spinning sheath/core bicomponent fibers comprising passing multiple streams of pressurized molten core polymer from distributor flow passages into multiple parallel spinneret flow passages in respective axial alignment with said multiple distributor flow passages, passing pressurized molten sheath polymer through channels positioned in the top surface of said spinneret and surrounding the inlets of said spinneret flow passages, and directing said sheath polymer to flow from said channels into each of said spinneret flow passages and each of the core polymer streams at a controlled pressure drop wherein the sheath polymer is a polyester having an intrinsic viscosity of about O.485 deciliters/gm in a solvent base of orthochlorophenol at 25° C and the core polymer has an intrinsic viscosity of about O.700 deciliters/gm in a solvent base of orthochlorophenol at 25°
C.
C.
5. The method of claim 7 wherein said sheath polymer is caused to flow radially outwardly through said channels to each of said spinneret core passage inlets.
6. The method of claim 4 wherein each of the bicomponent fibers exiting said spinneret is an eccentric sheath/core filament.
7. Bicomponent sheath/core melt spinnable polymer filaments produced by the method of claim 4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US70343891A | 1991-05-15 | 1991-05-15 | |
| US07/703,438 | 1991-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2067672A1 true CA2067672A1 (en) | 1992-11-16 |
Family
ID=24825395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2067672 Abandoned CA2067672A1 (en) | 1991-05-15 | 1992-04-30 | Method and apparatus for spinning bicomponent filaments and products produced therefrom |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0514084A3 (en) |
| JP (1) | JPH05171508A (en) |
| CA (1) | CA2067672A1 (en) |
| IE (1) | IE921536A1 (en) |
| MX (1) | MX9202229A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6554599B2 (en) | 2001-04-06 | 2003-04-29 | Arteva North America S.A.R.L. | Apparatus for spiral-boss heterofil spinneret |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1157433A (en) * | 1965-10-06 | 1969-07-09 | Ici Ltd | Polyester Fibres |
| GB1179436A (en) * | 1967-05-22 | 1970-01-28 | Ici Ltd | Helically Crimped Filamentary Materials |
| GB1228640A (en) * | 1967-10-18 | 1971-04-15 | ||
| JPS522005A (en) * | 1975-06-24 | 1977-01-08 | Tooru Toyoshima | Casttin place pile driving and method of and apparatus for reinforcing foundation |
| JPS5537602A (en) * | 1978-09-06 | 1980-03-15 | Nec Corp | Circuit used for simulation of integrated-circuit element |
| JPS5966507A (en) * | 1982-10-01 | 1984-04-16 | Toyobo Co Ltd | Method for spinning at high speed |
| JPS6366942A (en) * | 1986-09-08 | 1988-03-25 | Fuji Xerox Co Ltd | Method of mounting element onto substrate |
| JPH02139412A (en) * | 1988-11-16 | 1990-05-29 | Toray Ind Inc | Adhesive polyester conjugate fiber for sewing thread |
| JPH02307905A (en) * | 1989-05-23 | 1990-12-21 | Asahi Chem Ind Co Ltd | Spinneret of conjugate spinning |
| CA2030311A1 (en) * | 1989-12-21 | 1991-06-22 | Barrie L. Davies | Method and apparatus for spinning bicomponent filaments and products produced therefrom |
-
1992
- 1992-04-30 CA CA 2067672 patent/CA2067672A1/en not_active Abandoned
- 1992-05-07 EP EP19920304128 patent/EP0514084A3/en not_active Withdrawn
- 1992-05-14 MX MX9202229A patent/MX9202229A/en unknown
- 1992-05-15 JP JP12303892A patent/JPH05171508A/en active Pending
- 1992-07-01 IE IE921536A patent/IE921536A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0514084A3 (en) | 1993-08-04 |
| MX9202229A (en) | 1992-11-01 |
| IE921536A1 (en) | 1992-11-18 |
| EP0514084A2 (en) | 1992-11-19 |
| JPH05171508A (en) | 1993-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |