US3650659A - Spinning die - Google Patents

Spinning die Download PDF

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Publication number
US3650659A
US3650659A US24094A US3650659DA US3650659A US 3650659 A US3650659 A US 3650659A US 24094 A US24094 A US 24094A US 3650659D A US3650659D A US 3650659DA US 3650659 A US3650659 A US 3650659A
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Prior art keywords
flanks
flank
spinning
spinning die
distance
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Expired - Lifetime
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US24094A
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English (en)
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Hans Stapp
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Akzona Inc
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Akzona Inc
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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
    • D01D5/253—Formation of filaments, threads, or the like with a non-circular cross section; Spinnerette packs therefor

Definitions

  • ABSTRACT Spinning nozzle and the production of profiled filaments, threads, bristles or the like in the melt-spinning of a synthetic thermoplastic high molecular weight fiber-forming linear polymer by means of an H-shaped spinning orifice or opening wherein the crossbar flanks are parallel to and the inner flanks of the legbars are perpendicular to the axis of symmetry, the outer flanks of the legbars of the H-shaped orifice being at an angle of at least 5 up to 45 to the corresponding inner flanks.
  • INVEN'I'OR H A N 5 STA P P 0%?? I ATT'YS SPINNING DIE
  • a number of profiled spinning Openings have been proposed which are more or less similar to the shape of an H.
  • Such H-profiled orifices or openings are sometimes desired as a double-T profile or, if the crossbar or crossmember is very strongly pronounced in comparison to the height of the profile, as I-profiles. 1
  • FIG. 1 of Pat. No. 42,973 of the Office of Invention and Patent Matters of the German Democratic Republic there is illustrated a shaping or forming nozzle for the continuous drawing of glass-fiber-reinforced synthetic resin elements in which the nozzle has a double-T profile.
  • the crossbar flanks or edges of the profiled opening run parallel to the axis of symmetry which is parallel and midway between these flanks.
  • the inner flanks or edges formed by the legs or legbars projecting from the crossbar (designated by A and C) run perpendicular to the axis of symmetry.
  • the outer flanks or edges of these projecting legs run parallel to the inner flanks, i.e., so as to be also perpendicular to the axis of symmetry through the crossbar.
  • the inner and outer leg flanks of the I-I-profiled opening shown in FIG. 11 of Pat. No. 32,870 of the Office of Invention and Patent Matters of the German Democratic Republic likewise run parallel to one another. At the points of intersection between the inner leg flanks and the crossbar blanks, bores or enlarged openings are provided in order to assure a better connection between the individual bands of the molten polymer, the bores providing-an increased feed of the melt at each point of intersection.
  • a similar construction is followed in the spinning openings according to FIGS. 5 and 6 of Pat. No. 23,616 of the Office of Invention and Patent Matters of the German Democratic Republic.
  • French Pat. No. 1,358,092 likewise illustrates in FIG. 2 an H-shaped profiled opening in which the inner and outer flanks of the legbar projections run parallel.
  • the crossbar flanks in this case extend laterally beyond the outer legbar flanks.
  • the filament cross sections achieved by means of a spinning nozzle profiled in this manner are multi-lobed and are strongly dependent on the viscosity of the melt. Even with a shortening of the crossbar flanks, the extruded filaments exhibit no great similarity to an I i-shape once they are spun and drawn.
  • a similar conclusion can. be applied to the I-I-profile represented in FIG. 21 of Italian Pat. No. 269,130, as well as for the lprofiles of FIGS. l to V of US. Pat. No. 2,945,739, the use of which leads to bandor ribbonlike products without any precisely definedcross-sectional shape.
  • One object of the present invention is to provide a spinning nozzle capable of yielding a profiled filamentary synthetic thermoplastic polymer product under otherwise conventional spinning conditions such that the profile or cross section of the spun product has a definite and uniform H-shape, i.e., with a clearly defined crossbar andfour projecting legs or legbars extending approximately perpendicular to the crossbar at either end thereof.
  • Another object of the invention is to provide a spinning nozzle which can be used to achieve useful I-I- profiled filaments, bristles or the like of melt-spun and drawn fiber-forming linear polymers.
  • the invention has as an object the process of melt-spinning with the precisely shaped spinning orifice and the resulting product of this process.
  • the exact shape or configuration of the spinning nozzle of the invention is quite critical in achieving precisely H-shaped filamentary products, but otherwise it is possible to employ conventional melt-spinning and drawing apparatus and processing conditions which are well known in the art of synthetic filaments or similar extrusion products.
  • This criticality arises due to previous difficulties experienced in attempting to produce relatively fine or thin profiled filaments which are subject to considerably distortion and reduction in size or shape during the spinning and drawing operations. Nevertheless,-in order to achieve a linearly oriented filamentary product, these distorting influences cannot be avoided, and the particular shape of the spinning orifice has been found to be of very special importance in achieving a uniformly H- shaped product.
  • All synthetic fiber-forming linear polymers are generally suitable as melt-spinnable substances for purposes of the invention, and especially desirable products are obtained when using conventional polyamides or nylons such as polyhexamethylene adipamide or polycaprolactam and also linear saturated polyesters such as polyethylene terephthalate.
  • Other thermoplastic fiber-forming polymers such as polyacrylonitrile or polyolefins such as polypropylene may also be used. In spite of the fact that such polymers must be spun as a highly viscous melt, very uniform H-profiled filaments are obtained with a precisely defined cross section.
  • the spinning nozzle of the invention is contained in the usual nozzle plate or die through which the polymer melt is extruded.
  • Each die normally is furnished with a larger number of spinning opening or orifices, depending on the size of the extruded filaments and capacity of the spinning head, but for convenience only one of such openings or orifices has been illustrated.
  • the H-shaped opening has four projecting legs or legbars as defined by the inner flanks or edges 1 and the outer flanks or edges 2 connected by the crossbar or crossmember of the H as defined by the parallel flanks or edges 3,3.
  • the l-l-shaped opening has a horizontal axis of symmetry 4 extending through the middle of the crossbar and parallel to the crossbar flanks 3,3 so that the upper and lower portions of the H-shaped profile are substantially identical. It is likewise preferable to employ an orifice which is symmetrical about a vertical axis positioned midway between the oppositely disposed inner flanks 1 of the legbars.
  • the inner flanks 1 of the legbars are perpendicular to the crossbar flanks 3,3, i.e., so that the legbars intersect at a right angle to the crossbar.
  • the outer flanks 2 of the legbars must form the angle a with each corresponding inner flank 1 such that 5 a 45.
  • the outer flanks 2 of the pair of legbars on each side of the I-l-shaped opening will taper inwardly to intersect at the horizontal axis of symmetry and form an angle of intersection of 2a.
  • the opening or orifice is finally closed or completed by the end flanks or edges 5 which are preferably in a position perpendicular to a line 6 bisecting the flank angle at, Le, a line at the angle 11/2 midway between the flanks l and 2.
  • This position of flanks 5 favors the formation of a true H- profile of the melt-spun polymer.
  • the smallest distance or spacing b between the inner flank l and outer flank 2 of each legbar should be approximately equal to the spacing a between the crossbar flanks 3,3.
  • the spacing or distance c between oppositely disposed inner flanks l of the legbars and also the length d of these inner flanks are of some importance in achieving an H-profiled structure.
  • the spacing b always remains approximately equal to the spacing a.
  • the spinning nozzle or orifice is employed wherein the flank angle 0 lies between about and
  • the flank angle i.e., the angle between the inner flank l and outer flank 2 of each legbar.
  • the resulting melt-spun structures have a profile or cross section which is most comparable to the letter H.
  • Each leg of the H is clearly defined as an approximately perpendicular projection extending from the end of'the crossbar and blending smoothly and uniformly with the adjacent leg at the same end of the crossbar, all of the legs being substantially uniform in shape and size as bandlike protrusions or extensions on a uniform bandlike crossbar.
  • filaments is employed herein as including threads, bristles or even ribbonlike profiled structures composed of a fiber-forming polymer, such products being especially useful in brushes or similar articles requiring relatively flexible but durable filamentary parts with fingerlike or leglike extensions.
  • the orifice as well as the products can assume any position or spatial orientation and that these terms are merely used with reference to the normally observed position of the letter H, i.e., where the legs are vertical and the crossbar is horizontal.
  • the orifices can be placed in any position in the nozzle plate of the spinning apparatus, and although filaments are usually continuously spun in a vertical direction, this is not essential for purposes of the invention.
  • the filaments are spun and solidified with conventional spinning equipment other than the special nozzle or extrusion orifice, they are preferably immediately drawn for molecular orientation in accordance with known principles. They can then be collected on a winding spool or cut to suitable lengths.
  • the resulting filamentary products exhibited a highly uniform H-profile over a long continuous spinning run and maintained this profile within normal spinning and drawing conditions.
  • the spinning nozzle of the present invention is especially adapted to the production of profiled filaments having a relatively small overall dimension.
  • the final profiled products are preferably those with a size of about 1.0 to 20.0 denier, preferably 2.0 to 5.0 denier, these sizes being a measure of the weight per unit length as is conventional in the art of synthetic filaments and textiles.
  • Relatively thick or heavy filaments are especially useful as bristles for heavy duty brushes or brooms, while finer filaments can be used in softer brushes or may also be used in producing special textile products.
  • a spinning die for the production of at least one profiled melt-spun filament of a synthetic thermoplastic high molecular weight fiber-forming linear polymer
  • the improvement which comprises a spinning nozzle with a flanked opening defining an H-shaped extrusion orifice having a horizontal axis of symmetry through the crossbar of the H, said crossbar being formed by flanks of the opening running parallel to said axis of symmetry and each projecting legbar of the H being formed by an inner flank running perpendicular to said axis of symmetry and an outer flank positioned at an angle a to said inner flank of at least 5 and not more than 45, the smallest distance between said inner flank and outer flank of each legbar being approximately equal to the spacing between the parallel flanks of said cross bar.
  • a spinning die as claimed in claim 2 wherein the overall dimensions of said extrusion orifice are adapted to produce a melt-spun and drawn thermoplastic, fiber-forming linear polymer having a size of about 2.0 to 5.0 denier.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Biological Treatment Of Waste Water (AREA)
US24094A 1969-04-05 1970-03-31 Spinning die Expired - Lifetime US3650659A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE6913818U DE6913818U (de) 1969-04-05 1969-04-05 Spinnduese

Publications (1)

Publication Number Publication Date
US3650659A true US3650659A (en) 1972-03-21

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Application Number Title Priority Date Filing Date
US24094A Expired - Lifetime US3650659A (en) 1969-04-05 1970-03-31 Spinning die

Country Status (10)

Country Link
US (1) US3650659A (fr)
AT (1) AT314066B (fr)
BE (1) BE745508A (fr)
CH (1) CH497548A (fr)
DE (1) DE6913818U (fr)
ES (1) ES155266Y (fr)
FR (1) FR2042911A5 (fr)
GB (1) GB1285261A (fr)
LU (1) LU60593A1 (fr)
NL (1) NL7003834A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981948A (en) * 1975-01-02 1976-09-21 Eastman Kodak Company Arrangements in spinnerets of spinning orifices having significant kneeing potential
US5208107A (en) * 1991-05-31 1993-05-04 Basf Corporation Hollow trilobal cross-section filament
US5723159A (en) * 1989-04-04 1998-03-03 Eastman Chemical Company Spinnerets for making fibers capable of spontaneously transporting fluids
US5731010A (en) * 1995-02-16 1998-03-24 Nissan Motor Co., Ltd. Spinneret for manufacturing modified cross-section fibers with optical function
US6100207A (en) * 1995-02-02 2000-08-08 Eastman Chemical Company Absorbent head band

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2373892A (en) * 1942-12-30 1945-04-17 Eastman Kodak Co Production of resilient filaments and fibers
US3103264A (en) * 1961-03-16 1963-09-10 Anaconda American Brass Co Extruded cross sections for architectural screens
US3121040A (en) * 1962-10-19 1964-02-11 Polymers Inc Unoriented polyolefin filaments
US3188264A (en) * 1962-12-21 1965-06-08 Tektronix Inc Loose fill packing material
GB1170552A (en) * 1967-04-11 1969-11-12 Snam Progeiti S P A Spinneret Plates for use in Melt-Spinning Filaments of Non-Circular Cross-Section, and Filaments Produced therewith

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2373892A (en) * 1942-12-30 1945-04-17 Eastman Kodak Co Production of resilient filaments and fibers
US3103264A (en) * 1961-03-16 1963-09-10 Anaconda American Brass Co Extruded cross sections for architectural screens
US3121040A (en) * 1962-10-19 1964-02-11 Polymers Inc Unoriented polyolefin filaments
US3188264A (en) * 1962-12-21 1965-06-08 Tektronix Inc Loose fill packing material
GB1170552A (en) * 1967-04-11 1969-11-12 Snam Progeiti S P A Spinneret Plates for use in Melt-Spinning Filaments of Non-Circular Cross-Section, and Filaments Produced therewith

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981948A (en) * 1975-01-02 1976-09-21 Eastman Kodak Company Arrangements in spinnerets of spinning orifices having significant kneeing potential
US5723159A (en) * 1989-04-04 1998-03-03 Eastman Chemical Company Spinnerets for making fibers capable of spontaneously transporting fluids
US5733490A (en) * 1989-04-04 1998-03-31 Eastman Chemical Company Process for helically crimping a fiber
US5855798A (en) * 1989-04-04 1999-01-05 Eastman Chemical Company Process for spontaneouly transporting a fluid
US5972505A (en) * 1989-04-04 1999-10-26 Eastman Chemical Company Fibers capable of spontaneously transporting fluids
US5208107A (en) * 1991-05-31 1993-05-04 Basf Corporation Hollow trilobal cross-section filament
US6100207A (en) * 1995-02-02 2000-08-08 Eastman Chemical Company Absorbent head band
US5731010A (en) * 1995-02-16 1998-03-24 Nissan Motor Co., Ltd. Spinneret for manufacturing modified cross-section fibers with optical function

Also Published As

Publication number Publication date
FR2042911A5 (fr) 1971-02-12
AT314066B (de) 1974-03-25
DE6913818U (de) 1969-09-04
NL7003834A (fr) 1970-10-07
GB1285261A (en) 1972-08-16
ES155266U (es) 1970-06-01
ES155266Y (es) 1971-01-01
LU60593A1 (fr) 1970-05-26
BE745508A (fr) 1970-07-16
CH497548A (de) 1970-10-15

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