US3480996A - Spinneret for conjugate spinning - Google Patents

Spinneret for conjugate spinning Download PDF

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Publication number
US3480996A
US3480996A US702667A US3480996DA US3480996A US 3480996 A US3480996 A US 3480996A US 702667 A US702667 A US 702667A US 3480996D A US3480996D A US 3480996DA US 3480996 A US3480996 A US 3480996A
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Prior art keywords
spinneret
orifice
formula
channel
duct
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Masao Matsui
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SNIA Viscosa SpA
Kanebo Ltd
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SNIA Viscosa SpA
Kanebo Ltd
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    • 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
    • D01D5/32—Side-by-side structure; Spinnerette packs therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/26—Composite fibers made of two or more materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/217—Spinnerette forming conjugate, composite or hollow filaments

Definitions

  • An improved spinneret for producing side-by-side type conjugate filament having a uniform conjugate ratio in a high productivity comprises a first and second reservoir for the molten two polymeric materials, a partition wall of uniform thickness between said first and second reservoirs, a plurality of straight channels connecting to said first and second reservoirs respectively, a plurality of ducts perpendicular to said channels, each having an inlet in said channel and an outlet at one orifice, and a large number of orifices, connecting said ducts re spectively and arranged in a zig-zag form, the cross sectional area of said channel being sufiiciently larger than those of said duct and said orifice to make the difference in the' pressure loss between said two polymeric materials which flow along said passages in opposite directions until they meet at the inlet of said duct considerably smaller than the pressure loss which the polymeric materials suffer, while conjugately travelling along said duct and said
  • the present invention relates to
  • spinnerets for conjugate spinning are known in the art.
  • Said spinnerets comprise a plurality of spinning orifices wherein two differing molten polymeric materials are concurrently and meteredly fed and simultaneously spun to provide a two-component conjugate filament.
  • such spinnerets comprise two reservoirs arranged in side-by-side or in concentrical relationship, and passages by which each spinning orifice communicates with both said reservoirs, said orifices being arranged at even intervals along a straight line or respectively a circumference. Certain limits have been found critical for such intervals. The number of the orifices is therefore limited by the length of said straight line or of said circumference, divided by said interval at least 2 mm.
  • the principal object of this invention is to provide a new and improved spinneret having a high orifice density, wherein a great plurality of zig-zag arranged orifices are provided and wherefrom substantially uniform conjugate filaments of equal conjugate ratio are simultaneously spun.
  • a further object of the present invention is to provide a spinneret for conjugate spinning which is very simple in structure, and easy in the manufacture and the operation and which can produce conjugate filaments in a high productivity.
  • a given conjugate ratio predetermined by meteredly feeding a first and a second reservoirs with first and respectively second molten polymeric materials, can be provided and maintained at each spinning orifice, in a spinneret as referred to above, irrespective of the length of the path which each individual polymeric material is caused to travel from one reservoir to any individual spinning orifice, provided that:
  • Each orifice communicates with both first and second reservoirs by means of channels having inlets in the said first and in the said second reservoirs and wherein the said first and second polymeric materials travel in opposite directions until they meet at a location intermediate between said inlets, and of a common duct having its inlet at said location and its outlet in said orifice;
  • the dimensional parameters of said channel, duct and orifice, influencing the pressure loss, which the polymeric materials suffer while conjugately travelling along said common duct and orifice, are selected so that said pressure loss is so great in comparison of the pressure loss, which the individual polymeric materials suffer when travelling along said passages, that the difierence of said latter pressure loss, due to different lengths of said passages, does not essentially modify the total pressure loss which the polymeric materials suffer in their entire travel from said reservoirs to outside said orifice, the selection of said dimensional parameters being ensured when the wherein I is a length of the duct (mrn.), I the depth of the orifice (mm), x the length of the passage from the nearby reservoir to an inlet of the duct (mm) y the length of the passage from the farther reservoir to the inlet of the duct (mm.), K a shape factor of the channel and the duct and K is a shape factor of the orifice and the channel.
  • the left side of the above Formula 11 is referred to as a uniformity factor and abridged as U.F. hereinafter. Namely, the Formula 1 can be shown by U.F.;IO.
  • a spinneret for conjugate spinning is complicated in structure as compared with a usual spinneret for spinning one-component filament, so that the increase of the orifice density has a problem in view of construction and production cost, and this is one cause for raising the production cost of the conjugate filament.
  • orifices are arranged in a zigzag form in order to increase the orifice density.
  • orifices are arranged in such a zig-zag form that two orifices constitute one cycle as shown in FIG. 3, it is possible to arrange the orifices in the maximum two times more than when orifices are arranged on a straight line.
  • the conjugated ratio in the obtained two component filament is liable to be considerably uniform as shwon in FIG. 1 due to the diiference of the distance from two reservoirs to orifice.
  • the inventor has made various investigations with respect to a spinneret for conjugate spinning which has a simple structure and has orifices arranged in a zig-zag form, in which the ununiformity based on the difference of the distances from each reservoir to each orifice is decreased so that uniform conjugate filaments are eX- truded through each orifice and the present invention has been accomplished.
  • the present invention consists in an improved spinneret for simultaneously extruding in side-by-side relationship a first and a second molten polymeric material through a plurality of orifices, for simultaneously producing a corresponding plurality of conjugate filaments, comprising, in combination:
  • FIG. 1 are cross-sectional views of a plurality of two component filaments in which conjugate ratio is ununiform
  • FIG. 2 is a longitudinal-sectional view of one embodiment of the spinnert of the present invention.
  • FIG. 3 is a cross-sectional view of the spinneret shown in FIG. 2 taken on line A-A';
  • FIG. 4 is a longitudinal-sectional view of the spinneret shown in FIG. 2 taken on line BB' and also is a sectional view taken on line CC' in FIG. 3;
  • FIGS. 5 and 6 show two embodiments of channels having circular and triangle cross-sections, respectively
  • FIG. is a cross-sectional view of the spinneret in which orifices are arranged in a zig-Zag form along the circumference of the spinneret plate;
  • FIG. 8 is a cross-sectional view of a so-called tri-lobal type two component filament
  • FIG. 9 shows one embodiment of orifices applicable for spinning a tri-lobal filament
  • FIG. 10 shows one embodiment of an orifice consisting of Y-type slit.
  • the spinneret of the present invention consists essentially of reservoirs 1 and 2, channels 4 for connecting said two reservoirs, orifices 6 arranged in a zig-zag form and ducts 5 for connecting the channels 4 to the orifices 6 as shown in FIG. 2.
  • the channel 4 is groove provided in the spinneret plate 7 and connects two reservoirs 1 and 2.
  • the ducts 5 and the orifices 6 are arranged in a zig-zag form wherein two form one cycle unit.
  • the groove provided in the spinneret plate at a contact face of the partition Wall 3 with the spinneret plate 7 is the channel and in this case the cross-section thereof is a tetragon.
  • FIG. 2 is a cross-sectional view taken on line D-D in FIG. 4.
  • FIG. 5 shows a channel 4 having a circular cross-section which is formed by assembling two grooves having a semi-circular cross-section engraved on the partition wall 3 and the spinneret plate 7.
  • FIG. 6 shows a channel 4 which is a groove having a triangular cross-section formed in the partition wall 3.
  • the cross-sectional configuration of the channel to be applicable to the present invention may be circular, semi-circular, polygonal or other irregular forms, but the nearer to a circle the cross-sectional configuration, the less the stagnation.
  • two reservoirs 1 and 2 arranged concentrically are separated by the partition wall 3.
  • the channels 4 provided in a contact face of the partition wall 3 and the spinneret plate 7 are arranged radially.
  • the ducts 5 and the orifices -6 are arranged in such a zig-za g form that four form one cycle.
  • FIG. 9 shows a plurality of small holes arranged in Y-type, which are used to extrude a tri-lobal filament as shown in FIG. 8.
  • FIG. 10 shows an orifice consisting of a Y-type slit.
  • the uniformity is more than 95%.
  • R R and R represent radii of the channel, the duct and the orifice respectively and l 1 x and y have the same meanings as described in the Formula 1.
  • the value in the Formula 5 should be less than /1 From the Formulae 3, 4 and 5, the ununiformity is shown by the following Formula 6, so that the value in the Formula 6 should be less than
  • the reciprocal of the Formula 6 is the following Formula 7.
  • the Formula 7 is applicable to the case wherein in the Formula 1 the channel, the duct and the orifice have the configuration and the dimension of the above described condition, and in this case,
  • the conjugate filament having an ununiformity of less than 5% can be obtained by using the spinneret in which dimensions and the requirement of arrangement of the duct satisfy the Formula 7. It is apparent that even if the cross-section of the channel is not circular but is polygonal or semicircular or other irregular form, if the radius of the circle which inscribes said channel, satisfies the Formula 7 (or the Formula 1), the satisfactory result can be obtained.
  • the main object of the present invention is to increase the orifice density as mentioned before. Accordingly, it is required that the width of the channel is narrow as far as possible. In order to increase the uniformity of the conjugate ratio which is the other main object of the present invention by using the above channel having the narrower width, it is necessary that the height of cross-section of the channel is large. In such a case, it should be considered that the channel has a plurality of cylinders inscribing the channel. For example, when a cross-section of the channel is a rectangle having a width of 2W and a height of approx imately 2W N (N: a natural number), it should be considered that there are N cylinders inscribing the channel, the radius of which is W. In this case, considering the development of the Formula 7 derived from the Formula 2, the flow of the spinning solution flowing through one cylinder having a radius of W, is 1/ N of the total amount, so that the Formula 1 is approximately shown by the following Formula 8.
  • the Formula 8 is applicable to the case wherein in the Formula 1 the cross-section of the channel is rectangular and the conditions of the duct and the orifice are the same as those of the Formula 7, and in this case K and K are as follows:
  • the Formula 8 is effective for not only the channel having a rectangular section but also that having a form similar to a rectangle.
  • FIG. 9 shows a plurality of small holes arranged in Y-type which are used to extrnde a tri-lobal filament as shown in FIG. 8.
  • a group of small holes arranged closely for spinning unitary filament is hereinafter called as a unit orifice group.
  • the unit orifice group consisting of small holes having two or more different radii can be similarly used.
  • the present invention is applicable to said orifices.
  • FIG. 8 shows a cross-section of a so-called tri-lobal two component filament having three lobes.
  • the flow Q is led from the Formula 9 as in the case wherein the Formula 9 is derived from the Formulae 3 and 4, and the flow Q is led similarly, whereby the following Formula 10 is obtained.
  • the Formula 1 is shown by the Formula 10.
  • the Formula 10 is applicable to the case wherein the conditions of the channel and the duct in the Formula 1 are the same as those in the Formula 7 and the unit orifice group is composed of in, small holes having a radius of r and m small holes having a radius of 1' and in this case K and K are as follows:
  • this formula corresponds to the Formula 8 when m is 1 and m is (or m is 0 and m is l).
  • the Formula 11 is applicable to the case wherein the conditions of the channel and the duct in the Formula 1 are the same as those in the Formula 8 and the condition of the orifice is the same as that in the Formula 10, and in this case K and K are as follows:
  • the Formula 12 shows the relation between the back pressure and the flow from the slit having a width of g, a length of f and a depth of 1
  • the following Formula 13 is similarly obtained from the Formula 12 in the same manner as in the Formula 3.
  • the Formula 14 is applicable to the case wherein the conditions of the channel and the duct in the Formula 1 are the same as those in the Formula 8 and the orifice is a slit having a width of g and a length of f, and in this case K and K are as follows:
  • the slit use may be made of ones having various cross-sectional configurations, for example, I-type, V-type, C-type, L-type, T-type, Y-type, X-type, H-type, etc., but the Formula 14 is applicable to the slit when the total length of the slit is longer than the width thereof.
  • total length of the slit used herein means the sum of lengths of every portion in the slit.
  • the orifice shown in FIG. 10 is the Y-type slit, in which the width is g, and the lengths of three branched portions are f f and f respectively, and in this case the total length of said slit approximates (f +f +f Even in a slit, wherein each portion is separated, if the length of each portion is sufficiently longer than the width thereof, the sum of length of each portion may be the total length of the slit.
  • the slit constitutes a curve, for example, C-type
  • the length of the center line may be the total length of the slit.
  • the Formula 12 is obtained herein by ignoring the influence at the end of the slit, but said influence appears in a tendency of increase of the left side P in the Formula 12, so that the uniformity factor (U.F.) obtained by the Formula 14 is liable to become smaller than a true value.
  • the length 1 of the slit should be sufliciently larger than the width g, for example, 10 times of g, but the Formula 14 is applicable to even the case wherein the influence at the end of the slit cannot be ignored (for example, the length of the slit is 3 to 10 times the width g), because the influence at the end of the slit appears in the tendency of increase of the uniformity in two component filaments, so that this tendency is more safe and advantageous for the object of the present invention.
  • the Formula 15 is applicable to the case wherein conditions of the channel and the duct in the Formula 1 are the same as those in the Formula 8 and the orifice is a slit shape and in the same condition as that in the Formula 14, and in this case K and K are as follows:
  • the channel is a groove having a width of 0.5-4 mm., a height of 0.54 mm., a product of said width and height of 2-16 mm. and a length of 6-25 mm.
  • the channel is a cylinder having a diameter of 24 mm. and a length of 6-25 mm.
  • the duct is a cylinder having a diameter of 0.8-4 mm. and a length of -30 mm.
  • the orifice is a circular hole having a diameter of 0.1-0.4 mm.
  • the orifice is a circular hole having a diameter of 0.15-0.3 mm.
  • the unit orifice group corresponding to one duct is composed of a plurality of small circular holes each having a diameter of 0.050.2 mm.
  • the spinneret of the present invention has the above described structure, so that not only the orifice density is increased to improve the productivity, but also the uniformity of the conjugate filament can be maintained at a high level. Furthermore, the structure is simple, so that the production operation, and the maintenance are very easy.
  • Nylon-6 having a number average polymerization degree of 126, which contained no pigment, and the nylon-6 containing 0.6% of powdery titanium oxide as a pigment were melted separately and extruded simultaneously through common orifice of the concentric spinneret as shown in FIG. 7 with an extrusion ratio of U1 to form unitary filaments. After quenched, the filaments were taken up according to a conventional method. The crosssection of the obtained filament was checked by a microscope to determine the uniformity of the conjugate ratio.
  • Spinneret A had the constitution as shown in Table 2 and spinneret B had the constitution as shown in Table 3.
  • Duct 5 A cylinder having a radius (R of 1 mm. and a length (1 of 14 mm.
  • Orifice 6 -A circular hole having a radius (R of 0.2 mm. and a depth (1 of 0.4 mm. U.F. by the Formula 7 1.6.
  • Duct 5 A cylinder having a radius (R of 0.8 mm. and a length (l of 14 mm.
  • Orifice 6 A circular hole having a radius (R of 0.1 mm. and a depth (1 of 0.2 mm.
  • the cross-section of two component filament extruded through the spinneret A was checked by a microscope and as the result the mean value of the conjugate ratio was 50/50, the maximum deviation was 67/33 and the standard deviation was 15.2%.
  • the crosssection of two component filament extruded through the spinneret B was checked by a microscope and as the result the mean value of the conjugate ratio was 50/50, the maximum deviation was 53/47 and the standard deviation was 3.3%.
  • the lowest limit of the uniformity has been safely calculated and. the uniformity of two component filament obtained practically is often extremely higher than the lowest uniformity anticipated from these formulae, because, for example, the fluid resistance of a cylinder inscribing the channel is usually higher than that of the channel (fluid resistance is equal when the channel is cylindrical).
  • the uniformity is more than 99%, and it is considered to be completely uniform in practice.
  • EXAMPLE 2 The spinneret, in which the configuration and the di mension are substantially similar to those of the spinneret A in Example 1 and the unit orifice group was composed of 13 small circular holes having a radius (r of 0.1 mm. and a depth of 0.2 mm., which were arranged as shown in FIG. 9, was used as the spinneret C.
  • Duct 5 A cylinder having a radius (R of 2.0 mm. and a length (1 of 15 1mm.
  • Orifice 6 A Y-type slit having a width (g) of 0.2 mm., a total length (fl'i'fZl'fZi) of 4 mn a depth of 0.2 mm.
  • Duct 5 A cylinder having a radius (R of 1 mm. and a length of mm.
  • Orifice 6 A Y-type slit having a width (g) of 0.1 mm., a total length (f
  • An improved spinneret for simultaneously extruding in side-by-side relationship a first and a second molten polymeric spinnable materials through a plurality of orifices, for simultaneously producing a corresponding plurality of conjugate filaments, comprising, in combination:
  • the cross-sectional area of said channel being sufficiently larger than those of said duct and said orifice to make the difference in the pressure loss between said two polymeric materials which fiow along said passages in opposite directions until they meet at the inlet of said duct considerably smaller than the pressure loss which the polymeric materials suffer while conjugately travelling along said duct and said orifice.
  • Z is a length of the duct (mm), the depth of the orifice (mm), x the length of the passage from the nearer reservoir to an inlet of the duct (mm.), y the length of the passage from the farther reservoir to the inlet of the duct (mm), k a shape factor of the channel and the duct and k is the shape factor of the orifice and the channel as hereinbefore calculated.
  • said rectangular channel has a width of 2W and a height of ZWXN, R is the radius of the duct, m is the number of small holes having a radius of r and m is the number of small holes having a radius of T 10.
  • the channel is a groove having a width of 0.5-4 mm., a height of 0.5-4 mm., a product of said width and height of 2-16 mm. and a length of 6-25 mm.
  • a spinneret for manufacturing conjugate filament having a circular cross-section comprising two reservoirs connected mutually by a plurality of channels through a partition wall, orifices corresponding to each channel,
  • said partition wall being a cylinder having an inner diameter of 50 mm. and a thickness of 16 mm.
  • said channel being a rectangular groove having a width of 0.8 mm., a depth of 1.6 mm. and a length of 16 mm.
  • said duct being a cylinder having a radius of 0.8 mm. and a length of 14 mm.
  • said orifice being a circular hole having a radius of 0.1 mm. and a depth of 0.2 mm., a part of said ducts being positioned at a distance of 4 mm. and 12 mm. from the first and the second reservoirs respectively, and another part of said ducts being positioned at the reverse relation to said first part of the ducts.
  • a spinneret for manufacturing tri-lobal conjugate filament comprising two reservoirs connected mutually by a plurality of channels through a partition wall, orifices corresponding to each channel and composed of a plurality of small holes as shown in FIG. 9, which orifices are arranged in a Zig-zag form and ducts connecting the above described channels to the corresponding orifices, which comprises said partition wall being a cylinder having an inner diameter of 50 mm. and a thickness of 16 mm., said channel being a rectangular groove having at width of 0.8 mm., a depth of 1.6 mm. and a length of 16 mm., said duct being a cylinder having a radius of 0.8 mm.
  • the orifice being composed of 13 small circular holes having a radius of 0.05 mm. and a depth of 0.2 mm., a part of said ducts being positioned at a distance of 4 mm. and 12 mm. from the first and the second reservoirs respectively, and another part of said ducts being positioned at the reverse relation to said first part of the ducts.
  • a spinneret for manufacturing tri-lobal conjugate filament comprising two reservoirs connected mutually by a plurality of channels through a partition wall, orifices of Y-type slits as shown in FIG. 10 corresponding to each channel which are arranged in a zigzag form and ducts connecting the above described channels to the corresponding orifices, which comprises said partition wall being a flat board having a thickness of 25 mm., said channel being a rectangular groove having a width of 2 mm. and a depth of 4 mm., said duct being a cylinder having a radius of 1 mm.
  • said orifice being a Y-type slit having a width of 0.1 mm., a total length of 2 mm. and a depth of 0.2 mm., a part of said ducts being positioned at a distance of 5 mm and 20 mm. from the first and the second reservoirs respectively, and another part of said ducts being positioned at the reverse relation to said first part of the ducts.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Multicomponent Fibers (AREA)
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752616A (en) * 1967-12-20 1973-08-14 Kanegafuchi Spinning Co Ltd Mix-spinning apparatus
US3814561A (en) * 1970-04-07 1974-06-04 Kanagafuchi Boseki Kk Spinnerets for producing multi-segment filaments
US5244614A (en) * 1991-09-26 1993-09-14 Basf Corporation Process of making multicomponent trilobal fiber
EP0596248A2 (en) * 1992-10-19 1994-05-11 Mario Miani Extrusion head for two-component fibers, having a spinneret with high perforation density
US5468275A (en) * 1993-11-05 1995-11-21 Owens-Corning Fiberglas Technology, Inc. Apparatus having elongated orifices for centrifuging dual-component, curly, glass fibers
US5511960A (en) * 1992-03-17 1996-04-30 Chisso Corp. Spinneret device for conjugate melt-blow spinning
US5707735A (en) * 1996-03-18 1998-01-13 Midkiff; David Grant Multilobal conjugate fibers and fabrics

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052146A (en) * 1976-11-26 1977-10-04 Monsanto Company Extrusion pack for sheath-core filaments

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174184A (en) * 1962-06-25 1965-03-23 Monsanto Co Spinnerette
US3176346A (en) * 1962-06-25 1965-04-06 Monsanto Co Conjugate spinnerette

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174184A (en) * 1962-06-25 1965-03-23 Monsanto Co Spinnerette
US3176346A (en) * 1962-06-25 1965-04-06 Monsanto Co Conjugate spinnerette

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752616A (en) * 1967-12-20 1973-08-14 Kanegafuchi Spinning Co Ltd Mix-spinning apparatus
US3814561A (en) * 1970-04-07 1974-06-04 Kanagafuchi Boseki Kk Spinnerets for producing multi-segment filaments
US5244614A (en) * 1991-09-26 1993-09-14 Basf Corporation Process of making multicomponent trilobal fiber
US5458972A (en) * 1991-09-26 1995-10-17 Basf Corporation Multicomponent cross-section fiber
US5511960A (en) * 1992-03-17 1996-04-30 Chisso Corp. Spinneret device for conjugate melt-blow spinning
EP0596248A2 (en) * 1992-10-19 1994-05-11 Mario Miani Extrusion head for two-component fibers, having a spinneret with high perforation density
EP0596248A3 (en) * 1992-10-19 1994-11-23 Mario Miani Two-component fiber extrusion head with a highly perforated spinneret.
US5466142A (en) * 1992-10-19 1995-11-14 Miani; Mario Two-component extrusion head, having a spinneret with high perforation density
US5468275A (en) * 1993-11-05 1995-11-21 Owens-Corning Fiberglas Technology, Inc. Apparatus having elongated orifices for centrifuging dual-component, curly, glass fibers
US5707735A (en) * 1996-03-18 1998-01-13 Midkiff; David Grant Multilobal conjugate fibers and fabrics

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FR1553488A (US20070149660A1-20070628-C00088.png) 1969-01-10
ES350357A1 (es) 1969-04-16
NL6801911A (US20070149660A1-20070628-C00088.png) 1968-08-12
BE710593A (US20070149660A1-20070628-C00088.png) 1968-06-17
DE1710626A1 (de) 1972-04-06
GB1184417A (en) 1970-03-18

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