US3413683A - Annular bi-component spinerette assembly - Google Patents

Annular bi-component spinerette assembly Download PDF

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Publication number
US3413683A
US3413683A US490051A US49005165A US3413683A US 3413683 A US3413683 A US 3413683A US 490051 A US490051 A US 490051A US 49005165 A US49005165 A US 49005165A US 3413683 A US3413683 A US 3413683A
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Prior art keywords
plate
spinnerette
annular
filaments
septa
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Expired - Lifetime
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US490051A
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English (en)
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Jr Roy Lee Yelverton
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Wyeth Holdings LLC
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American Cyanamid Co
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Priority to US490051A priority Critical patent/US3413683A/en
Priority to FR76049A priority patent/FR1493888A/fr
Priority to NL6613027A priority patent/NL6613027A/xx
Priority to GB41746/66A priority patent/GB1150948A/en
Priority to LU52017A priority patent/LU52017A1/xx
Priority to ES0331521A priority patent/ES331521A1/es
Priority to BE687280D priority patent/BE687280A/xx
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Publication of US3413683A publication Critical patent/US3413683A/en
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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
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/217—Spinnerette forming conjugate, composite or hollow filaments

Definitions

  • annular bicomponent spinnerette For spinning economically large numbers of bicomponent fibers from each spinning position, an annular bicomponent spinnerette is provided having a novel spin dope distribution assembly associated therewith.
  • This invention relates to an improved circular extrusion head for multi-component extruded filaments and, more particularly, for bi-component extruded filaments.
  • Synthetic fibers which are achieving rapidly increasing use, are made by extruding polymer into a coagulating or cooling medium.
  • a coagulating or cooling medium There are, in general, three processes.
  • One is melt extrusion, where the materials which form the final filaments are melted and extruded through spinnerettes into a medium which is colder and which may be colder air, a coagulating bath, and the like.
  • the second method is the so-called dry spinning method, in which the materials forming the fiber are dissolved in a solvent of suitable volatility and are then extruded through spinnerettes into a hot atmosphere which may be air, the solvent rapidly evaporating, and the filament solidifying after it leaves the spinnerette nozzles.
  • the third method is the so-called wet spinning method, in which the polymer is dissolved in a solvent and extruded through a spinnerette into a coagulating bath, which causes the material to coagulate.
  • the wet gel is washed free of solvent, stretched and dried to form the final filament.
  • the coagulation may be by dilution of the solvent, chemical action on the materials extruded, or temperature. Very frequently the action of the coagulating bath may be a combination of dilution and temperature change.
  • the COag' lating bath is much colder than the temperature of the extruded dissolved material and also results in dilution, because in this case the spinning solution is a hot aqueous salt solution of polymer and the coagulating bath is a cold salt solution with excess Water. Coagulation takes place, therefore, both by temperature change and by dilution of the solvent.
  • the present invention relates to an apparatus and broadly also to an extruding process for wet spinning, the particular mechanism of coagulation in the bath into which the filaments are extruded is more or less immaterial; and the invention, therefore, is not limited to the wet spinning of any particular solutions into any particular coagulating bath.
  • the specific example which will be described is only a typical use of the invention, although a very valuable one, and is intended to be illustrative only of the operation of the invention.
  • Extruded fibers are produced in two general forms: continuous filament, in which the extruded filament is formed in continuous lengths, though sometimes a thread may have a number of filaments; and the so-called spun threads, which are produced from relatively shorter pieces of filaments, which are frequently referred to as tow or staple. It is with the latter type of synthetic fiber threads that the present invention is most commonly used, but the extrusion of multi-cornponent, continuous filament yarn is not excluded. In the past, when staple or tow was produced the fibers were machanically crimped,
  • the spun thread or yarn is then made into fabrics and usually in the finishing of the fabrics they are subjected to heat, such as hot water, steam and the like, which takes out the remaining mechanical crim leaving the spun yarn with the individual fibers substantially straightened.
  • the yarns spun as described above have achieved widespread commercial use, but there is a demand for a bulkier yarn, for two reasons among others.
  • the bulkier yarn has a softer feel or hand and, secondly, in many cases the bulkier yarn has greater covering power per unit weight, with of course a saving in cost.
  • the two components In order to produce a bullrier yarn it has been proposed to extrude multi-component and, preferably, bi-component fibers, the two components having slightly different rates of shrinkage.
  • These multi-cornponent fibers which in the balance of the specification will be referred to as bi-component fibers in accordance with the preferred form, tend to curl or crimp on relaxation from stretching and when such fibers are made up into yarns the curl results in a bulkier and softer yarn.
  • the fibers For textile processing purposes, after the fibers have been extruded from a spinnerette into a suitable coagulating bath they are usually stretched. If they are allowed to relax and curl, the crimp frequency and amplitude usually are too extensive for satisfactory textile processing, and therefore it is common to remove the curl temporarily by stretching under suitable conditions and then mechanically crimping for spinning purposes.
  • the spun yarn either before or after being formed into a fabric is then subjected to heat and cooling, for example by hot water, and on cooling the individual fibers curl and the bulky yarn results.
  • the present invention deals only with the extrusion of the oi-component threads, and the further treatment, spinning and the like, is not significantly changed by the present invention.
  • a guide plate back of the spinnerette plate had channels communicating with the rows of orifices in the spinnerette plate, and behind this were mounted septa along each row, which, in effect, with the plate defined a Y-sh-aped channel, the sharp edges of the septa of course being aligned with the center of the orifice openings in the back of the spinnerette plate.
  • Supply manifolds were provided so that one solution of material to be extruded flowed down one leg of the Y and the other down the other and joined and flowed in laminar fiow down through the stem of the Y and into the orifice openings in the spinnerette plate. This laminar fiow produced no substantial mixing of the normally quite viscous spinning solutions, and so, a filament was extruded which had in cross section a semi-circle of one component and the other semi-circle the other.
  • the present invention is not concerned with the exact shape and size of the spinnerette orifices.
  • the semi-circular cross sections are, of course, produced by round orifices.
  • the size of the orifices is determined by a number of factors, including the cross sectional size of the fiber produced.
  • a and B the two different spinning solutions were referred to as A and B, and this same convenient designation will be followed in the present specification.
  • the patent above referred to also describes a refinement in the form of an extremely fine mesh screen, for example less than 200 mesh, immediately back of the orifice openings in the spinnerette plate. This produced a very slight amount of local turbulence so that at the interface of the two semi-cylindrical filament components there was very slight mixing, which prevented the separation at the interface when the filament was coagulated.
  • the coagulating bath has to pass from the outside of the rope of extruded filaments into its center.
  • the temperature of the coagulating bath changes, because in many cases the spinning solutions are quite hot, for example a temperature difference of 60 C. and more from the approximately C. coagulating bath in the case of acrylic fibers extruded into aqueous thiocyanate baths, as described in the specific example below.
  • the chemical nature of the bath changed, because in coagulating the thiocyanate content of the coagulating bath increased, and in the case of other coagulating baths different chemical changes may result.
  • the filaments near the center of the rope did not coagulate at the same rate as those nearer the outside, and this problem is referred to in the art as white core.
  • the problem was not so severe that extrusion heads could not be used, but it required a wider tolerance for practical acceptance and so was a distinct practical disadvantage. It is more particularly with a solution to this problem and the elimination or great reduction of bending of septa during cleaning that the present invention relates.
  • the present application may, therefore, be considered as an improvement on the Sulich application; but it should be noted that the problems solved are really acute only with extrusion heads for commercial machines which have thousands of orifices.
  • the problems do not arise, at least in severe form, in laboratory machines which may have extrusion heads of only a hundred or a few hundred orifices.
  • the present invention is, therefore, an improved head for practical commercial machines and not a new principle which is needed in all sizes of extrusion heads, even for laboratory machines.
  • the present invention utilizes horizontal stacking, but the plates are neither rectangular or circular, they are annular.
  • the extrusion head therefore, has a large central conduit through which fresh cold coagulating bath is continually circulating.
  • the outer shape of the head would not theoretically need to be circular, it could be square; but as this would only increase manufacturing costs and slightly decrease efficiency, practical extrusion heads according to the present invention are made up of elements which are pure annuli with concentric inner and outer circular peripheries.
  • annular will be used in a slightly broader sense as shapes in which the central opening and the outer periphery form concentric curves which, however, do not have to be pure circles, although for practical purposes nothing is gained by departing from the ideal perfect annular shape.
  • the present invention does have certain general, though not sharply critical, dimensional relationships.
  • an annular head with a minute central opening is no better than a head with no opening at all, and it is of importance that the distance from the outer periphery of the annulus to the inner be sufiiciently small so that the number of rows of orifices is not excessive.
  • the cross sectional area of the central channel should not be significantly less than 5% of the area of the annular part of the extrusion head in which the orifices are located.
  • Another important advantage of the present invention is a greatly increased pull-away of the filaments from the extrusion orifices, which permits satisfactory operation at considerably higher speeds.
  • This is an advantage which can be enjoyed in two difierent ways.
  • higher speed can be used, or with the same speed, an enormously greater factor of safety can be enjoyed.
  • a compromise is usually chosen, increasing the speed markedly while at the same time not going to the limit, so as to increase relia ility of operation.
  • the best particular compromise in this respect will be chosen in each case in conjunction with the operating requirements, which include not only the nature of the material extruded but also its cross-sectional size.
  • the movement of the filaments through the coagulating bath serves to pull the bath along with it. In other words, they exert a pumping action. it is, therefore, ordinarily not necessary to use pumps which circulate bath at high speeds. Generally it is sufilcient to pump in bath at a rate such that it will not be degraded by warming up, change of chemical concentration, and the like; and the flow through a conventional bath chamber is quite largely effected by the pumping action of the filaments. In this connection, it should also be noted that there is a much stronger pum ing action on the bath entering through the central opening than that around the outer surface of the tubular rope of filaments. This pumping effect increases markedly the reliability of operation and is one of the factors permitting operation at higher speeds.
  • the generally annular arrangement of the orifices is not critical.
  • the rows may be perfect circles, each having a septum which is continuous around the row.
  • Other designs are possible, such as radial septa and holes. In such cases the holes need not be exactly in perfectly concentric circles. It is sufiicient that the rows of holes form an annular band.
  • the preferred pure annular shape of the plates has an additional advantage.
  • the septa now are cylinders fastened to a rigid fiat plate. This is both easy to produce mechanically and it reduces the possibility of slight bending or warping of the septa when an extrusion head is disassembled for cleaning to a very significant extent.
  • a cylindrical surface When supported at one end, a cylindrical surface represents a maximum of stiffness and so, the problem of septa bending which, although reduced over the vertical stacked extrusion head by the horizontal stacked head, still existed is solved in the present invention, and it is solved by reason of the shape and design of the invention and not by the addition of further elements.
  • FIG. 1 is an exploded view of the plates forming the stack of one modification
  • FIG. 2 is a cross section through a stack taken on the line 22 of FIG. 6;
  • FIG. 3 is a section along the line 33 of FIG. 5;
  • FIGS. 4A and 4B are cross sections along the lines 4A 4A and 4B4B respectively of FIG. 5, both at right angles to the section of EEG. 3;
  • FIG. 5 is a plan view, partly broken away, of two plates forming the distribution element for different solutions
  • FIG. 6 is an elevation of the front view of the primary distribution plate
  • PEG. 7 is an exploded view of a stack similar to FIG. 1 but showing a modified final distribution plate
  • FIG. 8 is a rear view, partly brokn away, of a portion of the distribution plate of FIG. 7.
  • FIG. 1 shows the principal elements of a stack in exploded form with the exception of a screen just back of the spinnerette orifices which does not show in this figure but can be seen in FIG. 2, as will be de scribed below.
  • the stack is made up of six main elements, a primary solution distribution plate 1 provided with external threads 18, an intermediate plate 2 with two rows of staggered holes 22 and 23, a final distribution element in two pieces 3 shown partly broken away in FIG. 1 and in more detail in FIGS. 3, 4A and 4B, an orifice plate 4 with orifices 20, an outer clamp ring 5 with a tapered skirt 1?. with internal threads 19 and an internal clamping element 6 with a clamp flange d, separate body It and external threads 9.
  • FIG. 1 it will be seen that as all of the elements of FIG. 1 are annular, when the stack is clamped together, as is shown in FIG. 2, there is a central passageway, shown generally at 7, which flares at its rear end where the tapered portion of the body 16 of the element 6 screws into the internal theads 11 of plate 1. This will be seen best in FIG. 2.
  • the stack will be described in connection with its operation with two supplies of polymer solutions of different shrinkage characteristics. These solutions will be labeled A and B in all of the figures in addition to the numerical labeling of the actual elements of each plate.
  • the two solutions A and B enter through pairs of pipes 13 and 15 in plate 1. This is best seen in FIG. 6, although FIG. 2 shows some of the elements in cross section. It will be seen that plate 1, looking at it from the front, is provided with two concentric grooves 14 and 16 which extend around a full circumference of the plate 1. It will be seen from FIG. 6 that solution A entering through the pipes 13 flows into the outer groove 14 whereas solution B, entering through pipes 15, flows out into groove 16.
  • Plate 2 mounts on the face of plate 1 with the outer ring of holes 22 registering with the groove 14 and the inner row of holes 23 registering with the groove 16. Plate 2 transforms the grooves 14 and 16 into conduits. Solutions A and B pass from the conduits through plate 2, through the holes 22 and 23 respecetively.
  • FIG. shows a front view, broken away to illustrate its three levels.
  • the rear-most level which is shown at the right, is provided with oblong openings 24 and 25. These openings alternate and the openings 24 extend radially beyond the ends of the openings 25.
  • the alignment is such that the openings 24 communicate with the staggered holes 22 of plate 2 and at their opposite end extend sufficiently to communicate with elements in the middle level of plate 3, as will be described below.
  • the openings 25 are shorter and communicate with the inner row of holes 23 of plate 2. Therefore, the openings 24- will be filled with solution A and the openings 25 with solution B.
  • the solution labeling is repeated for the first four openings in FIG. 5.
  • the openings 24 and 25 are really depressions in the rear-most portion of the plate 3 which is shown generally at 26 in FIGS. 3, 4A and 4B, as well as FIG. 5. It will be apparent that the plate 2 closes the rear of the depressions 24 and 25 transforming them into cavities with inlets from the holes 22 and 23 of plate 2 respectively.
  • FIGS. 3 to 5 it will be seen that there are concentric interrupted openings 27 and 28, as will be seen from FIG. 5. These grooves are flared, FIGS. 4A and 4B.
  • the appearance on FIG. 5 that the grooves would extend into two chambers 24 and 25 is because the flared portion is seen, but the grooves do not extend into these two chambers, since each only communicates with a single chamber.
  • the front level of plate 3 is shown at 29 in FIG. 3. It also appear in the section in FIG. 2, but the illustration is clearer in FIG. 3, which is to a larger scale.
  • the openings 27 are opposite solid portions 30, and corresponding solid portions 31 are opposite the openings 28. These solid portions are staggered, as appears more clearly from the left hand portion of FIG. 5 and FIGS. 4A and 4B.
  • septa 32 which are in the form of short concentric cylinders. Each septum is opposite the center of an annular row of spinnerette holes 20 of spinnerette orifice plate 4. It will be seen from a consideration of FIGURES 2, 3 and 5 that different streams A and B of polymer solutions flow on different sides of each septum. With the orific plate 4, the septa define annular channels through which the different polymer solutions flow. The particular solutions A and B are shown for a few septa in FIGS. 3, 4A and 4B, and the flow of solution B appears most clearly from FIG. 3, whereas the upper portion of FIG. 2 shows the flow for solution A. For clarity, only a few septa are shown in FIG. 2. It will be seen from FIG. 2 that a very fine mesh screen 21, for example a ZOO-mesh screen, is between the edges of the septa and the orifices in the back of plate 4. This screen produces slight turbulence at the interfaces of the streams of the two polymers.
  • a very fine mesh screen 21 for example a ZOO-mes
  • the spinnerette stack ex trudes into a coagulating bath, as has been described above. It will be seen, particularly from FIG. 2, that there is a fairly wide central passage through the spinnerette stack. Through this passage coagulating bath flows.
  • the filaments are extruded in the form of a hollow tube, coagulating bath flows between them both from the outside and from the inside, as described above.
  • the travel transversely through the tube of filaments is sufficiently short so that there is no substantial change in the characteristics of the coagulating bath for different fibers, and therefore the problem of White core is solved. The great effect of the short travel will be discussed below in connection with specific tests.
  • the septa are machined into the solid plate 29. They are, therefore, in the form of low, concentric cylinders with one end part of a rigid backing plate. This gives the septa the maximum strength against bending and greatly reduces or completely eliminates problems of bending of septa when the head is disassembled for cleaning, which, as has been pointed out above, must be effected periodically in practical machines. At the same time, the automatic alignment of septa with rows of orifices is fully maintained. In other words, all of the advantages of the horizontal stack spinnerette heads of the Sulich application referred to above are shared by the present invention. This represents an unusual and advantageous situation, because generally when apparatus is modified to eliminate one drawback, this is at the expense of certain other features. In other words, usually a compromise results. In the present case the important advantages of the solution of the white core problem and maximum insurance against bending of septa on cleaning are obtained without any offsetting disadvantages.
  • FIGS. 1 to 6 represent a very economical form of the invention in which the final distribution plate or element is made up of several portions and lends itself to cheap and simple fabrication.
  • FIGS. 7 and 8 illustrate a modification which operates in the same way with maximum rigidity of the final distribution plate but which presents the disadvantage of somewhat more expensive machining or fabrication.
  • the plates or elements 1, 2, 4, 5 and 6 are the same as in FIG. 1, they bear the same reference numerals.
  • the flow of solutions A and B through them is also the same, and the description will not be repeated.
  • the final distribution plate or element 33 is different and is illustrated in detail in FIG. 8, which shows part of the element broken away, exposing three different levels. Contrary to the element 3 of the earlier figures, this plate is in one piece, and FIG.
  • FIG. 8 shows a view from the rear and not from the front, as is the case in FIG. 6.
  • the rear face of the plate is provided with depressions 34 and 35 which, though slightly different in shape, perform exactly the same functions as the corresponding elements 24 and 25 of FIG. 5.
  • the plate 2 With the plate 2 they form conduits or chambers which communicate with the different staggered holes 22 and 23 of plate 2.
  • the resulting chamber 34 receives solution A and 35 solution B.
  • FIG. 8 Looking at the portion of FIG. 8 immediately to the left of center, it will be seen that there are a radial series of slots 36 and 37.
  • the front face of the plate 33 which appears at the extreme left of FIG. 8, has concentric septa machined in, the septa being the same short cylinders as appear in FIG. 5, but they are machined integrally in a single plate instead of a separate element.
  • the septa constitute the same type of element and perform the same function as in FIGS. 2, 3 and 5, they are designated by the same reference numeral 32.
  • plate 33 although of different mechanical construction, performs exactly the same function as the multiple element, distribution plate 3 of FIGS. 1 to 6. While plate 33 is illustrated as a single, unitary structure, it can be fabricated as a multiple structure element. The feature of the sinuous baffie would still be retained. While the modification of FIGS. 7 and 8 may be somewhat more expensive to make, when in the single, unitary form it operates with the same efficiency and, in fact, as far as bending of the septa is concerned, it is, if anything,
  • the present invention requires means for distributing the two polymer solutions on either side of each cylindrical or concentric septum, and the final distribution plates 3 and 33 represent only two possible mechanical distribution means. They are, therefore, illustrative only, though in a more specific aspect they constitute desirable mechanical structures.
  • the concentration of the coagulant rises as it extracts salt from the coagulating filaments.
  • the coagulant concentration should not be permitted to rise above a certain maximum so no single filament gets exposed to too high a concentration of coagulant. Since the coagulant concentration rises as the coagulant penetrates the fiber bundle, the coagulant fed to the spinning apparatus must have a low enough concentration to allow for this rise without reaching that level at which the white core problem exists. Since the flow path of coagulant through the fiber bundle is greatly shortened by the present invention, the concentration rise in the coagulant is greatly lessened. Thus, the coagulant fed to the spinning apparatus using the present invention can be much higher (up to 50% higher) without defective filaments due to improper coagulation.
  • annular spinnerette assembly comprising an annular spinnerette having a plurality of orifices disposed in concentric circular rows, means to introduce two separate spinning solutions thereto, and an annular distributor mounted adjacent said spinnerette to keep separate said two spinning solutions until just prior to flowing both said spinning solutions side-by-side through each orifice of said spinnerette;
  • the improved distributor comprising an annular plate provided with (a) a plurality of annular septa defining a plurality of annular spinning solution channels in one face thereof, (b) a plurality of slots in the base of each such channel extending through such distributor, such slots being disposed in radial arrays with each such slot in any single such spinning solution channel being adjacent to and substantially coextensive with the slots in the next adjacent spinning solution channels, and (c) means to direct the two spinning solutions alternately into slots in alternate spinning solution channels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Artificial Filaments (AREA)
US490051A 1965-09-24 1965-09-24 Annular bi-component spinerette assembly Expired - Lifetime US3413683A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US490051A US3413683A (en) 1965-09-24 1965-09-24 Annular bi-component spinerette assembly
FR76049A FR1493888A (fr) 1965-09-24 1966-09-12 Procédé et appareil pour le filage de filaments composites
NL6613027A NL6613027A (enrdf_load_stackoverflow) 1965-09-24 1966-09-15
GB41746/66A GB1150948A (en) 1965-09-24 1966-09-19 Spinneret for Producing Bi-Component Filaments by Wet-Spinning
LU52017A LU52017A1 (enrdf_load_stackoverflow) 1965-09-24 1966-09-22
ES0331521A ES331521A1 (es) 1965-09-24 1966-09-23 Procedimiento y aparato para la extrusion de filamentos.
BE687280D BE687280A (enrdf_load_stackoverflow) 1965-09-24 1966-09-23

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Application Number Priority Date Filing Date Title
US490051A US3413683A (en) 1965-09-24 1965-09-24 Annular bi-component spinerette assembly

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US3413683A true US3413683A (en) 1968-12-03

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US490051A Expired - Lifetime US3413683A (en) 1965-09-24 1965-09-24 Annular bi-component spinerette assembly

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US (1) US3413683A (enrdf_load_stackoverflow)
BE (1) BE687280A (enrdf_load_stackoverflow)
ES (1) ES331521A1 (enrdf_load_stackoverflow)
FR (1) FR1493888A (enrdf_load_stackoverflow)
GB (1) GB1150948A (enrdf_load_stackoverflow)
LU (1) LU52017A1 (enrdf_load_stackoverflow)
NL (1) NL6613027A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884606A (en) * 1971-10-01 1975-05-20 Dow Chemical Co Apparatus for multilayer coextrusion of sheet or film
US4568506A (en) * 1980-07-29 1986-02-04 Teijin Limited Process for producing an assembly of many fibers
US5466142A (en) * 1992-10-19 1995-11-14 Miani; Mario Two-component extrusion head, having a spinneret with high perforation density
US7987614B2 (en) * 2004-04-12 2011-08-02 Erickson Robert W Restraining device for reducing warp in lumber during drying

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2047313A (en) * 1932-04-30 1936-07-14 Dreyfus Henry Production of artificial filaments
US2536092A (en) * 1946-09-21 1951-01-02 American Viscose Corp Method and apparatus for wet spinning of artificial filaments
US3245113A (en) * 1963-06-10 1966-04-12 American Cyanamid Co Apparatus for forming multi-component fibers
US3248466A (en) * 1958-10-30 1966-04-26 Beaunit Corp Process for producing two component crimpable regenerated cellulose fiber
US3341645A (en) * 1963-03-07 1967-09-12 Teijin Ltd Method of producing viscose rayon staple and a spinning apparatus for use in the method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2047313A (en) * 1932-04-30 1936-07-14 Dreyfus Henry Production of artificial filaments
US2536092A (en) * 1946-09-21 1951-01-02 American Viscose Corp Method and apparatus for wet spinning of artificial filaments
US3248466A (en) * 1958-10-30 1966-04-26 Beaunit Corp Process for producing two component crimpable regenerated cellulose fiber
US3341645A (en) * 1963-03-07 1967-09-12 Teijin Ltd Method of producing viscose rayon staple and a spinning apparatus for use in the method
US3245113A (en) * 1963-06-10 1966-04-12 American Cyanamid Co Apparatus for forming multi-component fibers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884606A (en) * 1971-10-01 1975-05-20 Dow Chemical Co Apparatus for multilayer coextrusion of sheet or film
US4568506A (en) * 1980-07-29 1986-02-04 Teijin Limited Process for producing an assembly of many fibers
US5466142A (en) * 1992-10-19 1995-11-14 Miani; Mario Two-component extrusion head, having a spinneret with high perforation density
US7987614B2 (en) * 2004-04-12 2011-08-02 Erickson Robert W Restraining device for reducing warp in lumber during drying

Also Published As

Publication number Publication date
LU52017A1 (enrdf_load_stackoverflow) 1966-11-22
GB1150948A (en) 1969-05-07
FR1493888A (fr) 1967-09-01
ES331521A1 (es) 1967-11-16
NL6613027A (enrdf_load_stackoverflow) 1967-03-28
BE687280A (enrdf_load_stackoverflow) 1967-03-23

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