US3872659A - Method and apparatus for production of tubular strand and rope - Google Patents

Method and apparatus for production of tubular strand and rope Download PDF

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Publication number
US3872659A
US3872659A US247158A US24715872A US3872659A US 3872659 A US3872659 A US 3872659A US 247158 A US247158 A US 247158A US 24715872 A US24715872 A US 24715872A US 3872659 A US3872659 A US 3872659A
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US
United States
Prior art keywords
filaments
rigid member
die
strand
tubular
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US247158A
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English (en)
Inventor
Robert Edward Campbell
Cyril Duncan Ralph Sherwin
Charles Leslie Turner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridon Ropes Ltd
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Bridon Ropes Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of US3872659A publication Critical patent/US3872659A/en
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
    • D07B1/0693—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a strand configuration
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/12—Ropes or cables with a hollow core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B3/00—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material
    • D07B3/02—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the supply reels rotate about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the component strands away from the supply reels in fixed position
    • D07B3/04—General-purpose machines or apparatus for producing twisted ropes or cables from component strands of the same or different material in which the supply reels rotate about the axis of the rope or cable or in which a guide member rotates about the axis of the rope or cable to guide the component strands away from the supply reels in fixed position and are arranged in tandem along the axis of the machine, e.g. tubular or high-speed type stranding machine
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B5/00—Making ropes or cables from special materials or of particular form
    • D07B5/007—Making ropes or cables from special materials or of particular form comprising postformed and thereby radially plastically deformed elements
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/025—Preforming the wires or strands prior to closing
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/027—Postforming of ropes or strands
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2019—Strands pressed to shape
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53796—Puller or pusher means, contained force multiplying operator
    • Y10T29/53848—Puller or pusher means, contained force multiplying operator having screw operator
    • Y10T29/53857—Central screw, work-engagers around screw
    • Y10T29/53878—Tubular or tube segment forms work-engager
    • Y10T29/53883—Screw threaded work-engager

Definitions

  • Strands can be Compressed by the die, and the Central le 0 earc support of the wires or strands may be maintained pression.
  • Tubular during at least the start of com t mm C C e? d ma Th C .1 Sh n w UH .m ,n a .w, m 0 v r a .wu C I. PC 1 m t. n 6 CC Ma mm Mh
  • References Cited UNITED STATES PATENTS wires abut along interfaces which are straight lines in transverse section.
  • the present invention relates to a method and apparatus for the manufacture of tubular wire strand or wire rope or core for wire rope; strand comprises a plurality of parallel or helically laid wires, and rope comprises a plurality of strands laid in helical or parallel relationship.
  • tubular rope as a thermie lance is known and is described in British Pat. Specification No. 1,188,079, but the previous methods of manufacture are either slow and time consuming or relatively expensive, and production is confined to comparatively short lengths.
  • the object of the present invention is to provide a method and apparatus whereby tubular strand or rope, in a wide variety of constructions, may be manufactured as a continuous operation of considerable duration.
  • the present invention provides a method of forming tubular wire-strand or wire-rope or core for wire-rope, comprising leading a plurality of filaments through a die, and centrally supporting the filaments against inward collapse at least until the filaments are in mutual contact.
  • filament includes wire and strand.
  • the method further comprises, within the die and after mutual contact of the filaments, compressingthe filaments inwardly by means of the die, to cause plastic flow at the points of mutual contact of the filaments.
  • the filaments are centrally supported during at least i supported during at least the initial part of the compression.
  • a wire strand or core By carrying the compression sufficiently far, while centrally supporting the wires by means of a rigid member ofcircular transverse section, a wire strand or core can be produced which in transverse section has a central circular void, and in which adjacent wires abut along interfaces which are straight lines in transverse section.
  • the production of tubular strand is achieved by attaching a circular rod or mandrel to the lay plate of a stranding machine in such a manner that the longitudinal axis of the mandrel lies parallel and concentric with the longitudinal axis of the lay plate and a forming die having a parallel bore, the length of the mandrel being such that, when in operation, its free end projects into the forming die for a distance not less than half the length of the parallel bore of the die.
  • the mandrel is attached to the nose" of a preforming head on a closing machine so that the longitudinal axis of the mandrel lies parallel and concentric with the common horizontal axis of the pre-forming head and the closing die having a parallel bore, the length of the mandrel being such that the free end projects into the closing die for a distance not less than half the length of the parallel bore of the die.
  • the function of the mandrel when operating in either a stranding or closing machine, is that ofa continuously retractable central or core element affording support to the overlying wires or strands at the moment of forming, and for a controlled length of time thereafter whilst consolidation by the forming or closing die takes place. From this stage onwards no further internal sup port is required and the strand or rope emerges from the die in tubular form.
  • FIG. 1 is an isometric view of part ofa stranding machine
  • FIGS. 2a, and 2b are longitudinal sections of the free end of two types of mandrel which lies within the die;
  • FIGS. 3 to 8 are cross-sections of a five, seven, eight, nine, and ten wire tubular strand respectively, before compression by the die of the stranding machine of FIG. 1;
  • FIGS. 9 to 14 show the respective tubular strands of FIGS, 3 to 8 upon emergence from the die of the stranding machine of FIG. 1 used in conjunction with the mandrel shown in FIG. 2b, corresponding to FIGS. 5 to 8 respectively;
  • FIG. 15 shows the tubular strand of FIG. 4 upon emergence from the forming die of the stranding ma chine of FIG. 1 used in conjunction with the mandrel shown in FIG. 2b;
  • FIG. 16 is a 27 round-wire strand formed in three covers 9 X 9 X 9/0; before radial compression
  • FIG. 17 shows the consolidated cross-section of the strand of FIG. 16 upon emergence from the forming die of the stranding machine of FIG. l-used in conjunction with the mandrel shown in FIG. 2a;
  • FIG. 18 is an 18 round-wire strand before compression formed in two covers 9 X 9/0 incorporating wires of different diameter;
  • FIG. 19 shows the consolidated cross-section of the strand of FIG. 18 upon emergence from the die of the stranding machine of FIG. I used in conjunction with the mandrel shown in FIG. 2a;
  • FIG. 20 is a tubular steel wire strand is comprised of non-ferrous wires
  • FIG. 21 shows the consolidated cross-section of the strand of FIG. 20 upon emergence from the die of the stranding machine of FIG. 1 in conjunction with the mandrel shown in FIG. 2a and;
  • FIG. 22 is an isometric view of part of a closing machine fitted with rope preforming head.
  • suitable lengths of round, cold drawn, high tensile carbon steel wire are wound on bobbins 2 and loaded into a stranding machine shown in part in FIG.'I.
  • the number of bobbins is equal to the number of wire desired strand constructron.
  • the wires 1 from the bobbins 2 run along guides in the tube 9 of the strander, and are then threaded through fairlcads 3 in the lay plate 4, and then led to a focal or forming point 5 on the horizontal axis AB of the strander.
  • the individual wires 1, upon reaching the focal point 5, make physical contact with the surface ofa mandrel 6 fixed to the lay plate 4 and concentric with the axis A-B; the individual wires make contact with adjacent wires as they assume assigned positions to form a peripheral layer around the circumference of the mandrel 6.
  • the wires 1 traverse into the lead-in, or mouth, of the die 7 making progressive cir cumferential contact with the working surface or bore 8 of the die.
  • the tube 9 of the strander is rotated clockwise or anti-clockwise, the individual wires 1 adopt a left or right hand helical lay at the forming point 5, thereby forming a coreless or tubular strand.
  • the emergent strand is post-formed by alternate bending in opposite directions.
  • a tubular strand i.e., a strand without a permanent centre or king wire
  • mandrel 6 the free end of which may have the longitudinal profile shown in FIGS. 21:, and 2b.
  • the particular form of mandrel employed depends on the strand construction, wire diameter, and desired bore of the tubular strand.
  • the effective working portion 12 of the mandrel shown in FIG. 2a commences at a point 11, the diame ter at this point being the desired bore of the strand, it is maintained from the point 11 to the extremity 15 of the mandrel.
  • the effective working portion of the mandrel shown in FIG. 2a commencesat the point 11 and progressively tapers to a point 14, the diameter at this point being the desired bore of the finished tubular strand; the remaining portion of the mandrel to its extremity 15 is cylindrical and has the same diameter as the point 14.
  • the mandrel shown in FIG. 2b is continuously tapered from its starting diameter at the point 11 to its extremity 15, and would be employed in those strand constructions requiring a micro-bore and maximum metal in the wall of the strand. In such instances the mandrel is used to provide internal support to the point at which the consolidated strand is completely stable, and the forming die is used as a reducing means and provides control over the final strand configuration (FIG. 15).
  • the mandrel In conjunction with the forming die, the mandrel, irrespective of its design, has an initial function which is to afford temporary support whilst the strand is being formed in the absence of a king wire. It subsequently maintains this support whilst the formed strand is consolidated by radial compression to the stage where the components are capable of sustaining one another in their assigned positions, and the strand becomes resistant to collapse, that is to say when the wires have started to flow plastically at the lines of mutual contact with adjacent wires.
  • the support offered by the mandrel is temporary, initially allowing the component wires to make line contact one with another. Its subsequent retention is to provide support whilst the radial pressure induces plastic flow and deformation of the steel at these lines of contact to initiate conjoint plane surfaces.
  • the internal support afforded by the mandrel can be withdrawn, the uniform inwardly directed radial pressure required to bring the tubular strand to its finished size being exercised by the forming die.
  • FIG. 3 illustrates a five-wire strand as it would appear in crosssection at the point 11, the radius (r) of the individual wires 1 being greater than the radius (R) of the mandrel 6.
  • FIG. 9 shows the same strand construction upon leaving the extremity 15 of the mandrel the initially round-wires 1 (broken line) are transformed to wires which, in section, have an arcuate head 16, radiused at the corners to merge with the plane surfaces 17 between adjacent wires, and leave a central circular void 18.
  • FIG. 10 The effect of applying the same treatment to the six-wire tubular strand of FIG. 4 is shown in FIG. 10.
  • FIGS. 11 to 14 The resulting strands are illustrated in FIGS. 11 to 14.
  • FIG. 2b shows the mandrel shown in FIG. 2b.
  • the bore of the forming die is also tapered so that, as the strand traverses beyond the tip of the mandrel, the forming die continues to exert a uniform radial pressure which results in further inwardly directed consolidation of the strand.
  • FIG. 15 shows the ultimate very small tubular construction achieved by this means from the six-wire strand shown in FIG. 4. l
  • FIGS. 16, 18, and 20 show the strands in cross-section as they would be, using the mandrel shown in FIG. 2a at the point 11, whilst FIGS. 17, 19, and 21 illustrate the tubular shape of the respective strands as they would be on emergence from the forming die.
  • the desired construction can be built up from a plurality of helically spun round-wire strands having a king wire or from tubular strands.
  • the rope is produced by winding a plurality of strands, onto bobbins and loading them into a closing machine (FIG. 22).
  • the free end of strand from each bobbin is fed through the machine via fairleads to the lay plate 19 and on through a pre-forming head 20.
  • the pre-forming head 20 is of orthodox design, except that a mandrel 21, conforming to FIG. 2a, is anchored at the apex 22 of the pre-forming head, its longitudinal axis being concentric and parallel with the longitudinal axis C-D of the pre-forming head.
  • the length of the mandrel 21, from the point of anchorage to its extremity is sufficient to allow its effective working length 12 (FIG. 2a and 2b) to protrude into the closing die 23 for a distance not less than half the length of the parallel portion of the bore of the die.
  • the ends of strand projecting from the exit side of the die 23 are secured to a strap attached to the take-up portion (not shown) of the closer, after passing through a set of compression rollers.
  • the function of the mandrel during the closing of a rope is comparable with that of the mandrel during stranding in that it provides temporary central support until such time as the rope has been consolidated under the influence of the forming die, and becomes selfsupporting. At this stage the diameter of the strands is greater than that of the central void and continued support from the mandrel becomes unnecessary as the tubular rope traverse forward.
  • the strands or ropes may be circumferentially sheathed, coated, or wrapped with a layer or layers of elastomer, with or without reinforcement, or spirally taped with metal, or covered with composite overlapping layers of metal and elastomer.
  • a method of forming a tubular wire-strand or tubular wire-rope or tubular core for wire-rope by leading a plurality of round filaments, all of the same material, onto a rigid member having a circular transverse section with a portion thereof tapering in the direction of movement of the filaments passing through a circular annular die coaxial relative to the rigid member comprising the steps of: centrally supporting the filaments on the rigid member against inward collapse until the filaments are in mutual contact, compressing the filaments radially inwardly by means of the die to cause plastic flow at the points of mutual contact of the filaments; and centrally supporting the filaments, during at least the initial part of the compression, by supporting the filaments on the tapering portion of the rigid member,

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  • Ropes Or Cables (AREA)
US247158A 1971-04-26 1972-04-24 Method and apparatus for production of tubular strand and rope Expired - Lifetime US3872659A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1143671A GB1373814A (en) 1971-04-26 1971-04-26 Tubular strand and rope

Publications (1)

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US3872659A true US3872659A (en) 1975-03-25

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US247158A Expired - Lifetime US3872659A (en) 1971-04-26 1972-04-24 Method and apparatus for production of tubular strand and rope

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US (1) US3872659A (enrdf_load_stackoverflow)
BE (1) BE782688A (enrdf_load_stackoverflow)
DE (1) DE2219816A1 (enrdf_load_stackoverflow)
FR (1) FR2136723A5 (enrdf_load_stackoverflow)
GB (1) GB1373814A (enrdf_load_stackoverflow)
IT (1) IT956235B (enrdf_load_stackoverflow)
LU (1) LU65245A1 (enrdf_load_stackoverflow)
NL (1) NL7205582A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4040942A (en) * 1976-08-23 1977-08-09 Kennecott Copper Corporation Multiple-track cathode for electroformation of metallic filaments
US4311001A (en) * 1978-12-08 1982-01-19 Glushko Mikhail F Method for manufacturing twisted wire products and product made by this method
US4601165A (en) * 1984-06-07 1986-07-22 Akzo Nv Method of manufacturing a compact, multilayer single strand reinforcing cord for use in elastomeric products and a cord produced by this method
US4724663A (en) * 1984-07-09 1988-02-16 N.V. Bekaert S.A. Steel cord twisting structure
US4915490A (en) * 1987-01-13 1990-04-10 Stc Plc Optical fibre cable with crush-resistant tube
US4936647A (en) * 1985-05-15 1990-06-26 Babcock Industries, Inc. High tensile strength compacted towing cable with signal transmission element
US5303537A (en) * 1990-06-28 1994-04-19 The Goodyear Tire & Rubber Company Apparatus for making metallic cord
US20060096107A1 (en) * 2004-11-05 2006-05-11 Hickey James K Lay out line
US20080105327A1 (en) * 2006-11-07 2008-05-08 James Christopher Kish Mandrel for a tubular strander
CN102296473A (zh) * 2011-08-19 2011-12-28 甘肃荣信电材科技有限公司 能提高钢丝绳捻制质量的压丝环
US20150152596A1 (en) * 2012-07-02 2015-06-04 Casar Drahtseilwerk Saar Gmbh Device and method for producing a strand or a cable
US20170370028A1 (en) * 2016-06-28 2017-12-28 Loftex Usa Llc Method for producing single-hole ultra soft yarns

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2851664C2 (de) * 1978-11-29 1985-02-21 Wsesojusnyj naučno-issledovatel'skij institut metisnoj promyšlennosti, Magnitogorsk Verfahren zur Herstellung verseilter Drahterzeugnisse
GB2262970B (en) * 1991-12-19 1995-02-15 Bridon Plc Flexible roof bolt
AU2008241376A1 (en) * 2007-04-23 2008-10-30 Onesteel Wire Pty Limited Reinforcing of formations
RU2372431C2 (ru) * 2007-12-12 2009-11-10 Общество с ограниченной ответственностью "Научно-производственный центр "Гальва" Канат-кабель с облегченным пластмассовым сердечником для подъема грузов и транспортировки химических реагентов в нефтяных и газовых скважинах
CN111648150B (zh) * 2020-05-11 2022-05-24 贵州钢绳股份有限公司 粗直径单股钢丝绳
CN112111850B (zh) * 2020-09-25 2022-04-01 山东海工科技有限公司 用于编织绳索的多层夹芯送线装置

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US330047A (en) * 1885-11-10 Gable armoring machine
US475889A (en) * 1892-05-31 Machine for making hollow wire cable
US1245067A (en) * 1916-12-11 1917-10-30 Goodrich Co B F Method of making hollow cord.
US1261317A (en) * 1914-04-20 1918-04-02 Goodrich Co B F Machine for making hallow cord.
US1537632A (en) * 1923-04-20 1925-05-12 Salisbury & Satterlee Co Wire-coiling machine
US1712264A (en) * 1923-02-26 1929-05-07 John R Gammeter Machine and method for forming cables
US2222505A (en) * 1940-07-01 1940-11-19 Haskell Dawes Machine Company Sizing die for twisters
US3083817A (en) * 1953-11-18 1963-04-02 British Ropes Ltd Wire ropes
US3128799A (en) * 1961-05-29 1964-04-14 Northern Electric Co Strand forming device
US3130536A (en) * 1961-09-21 1964-04-28 American Chain & Cable Co Method of manufacturing wire rope
US3667206A (en) * 1970-02-16 1972-06-06 American Chain & Cable Co Interlocked multi-wire member
US3707839A (en) * 1970-10-23 1973-01-02 Od Polt Institut Method of making a closed layer of shaped wire in wire ropes, etc.

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US330047A (en) * 1885-11-10 Gable armoring machine
US475889A (en) * 1892-05-31 Machine for making hollow wire cable
US1261317A (en) * 1914-04-20 1918-04-02 Goodrich Co B F Machine for making hallow cord.
US1245067A (en) * 1916-12-11 1917-10-30 Goodrich Co B F Method of making hollow cord.
US1712264A (en) * 1923-02-26 1929-05-07 John R Gammeter Machine and method for forming cables
US1537632A (en) * 1923-04-20 1925-05-12 Salisbury & Satterlee Co Wire-coiling machine
US2222505A (en) * 1940-07-01 1940-11-19 Haskell Dawes Machine Company Sizing die for twisters
US3083817A (en) * 1953-11-18 1963-04-02 British Ropes Ltd Wire ropes
US3128799A (en) * 1961-05-29 1964-04-14 Northern Electric Co Strand forming device
US3130536A (en) * 1961-09-21 1964-04-28 American Chain & Cable Co Method of manufacturing wire rope
US3667206A (en) * 1970-02-16 1972-06-06 American Chain & Cable Co Interlocked multi-wire member
US3707839A (en) * 1970-10-23 1973-01-02 Od Polt Institut Method of making a closed layer of shaped wire in wire ropes, etc.

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4040942A (en) * 1976-08-23 1977-08-09 Kennecott Copper Corporation Multiple-track cathode for electroformation of metallic filaments
US4311001A (en) * 1978-12-08 1982-01-19 Glushko Mikhail F Method for manufacturing twisted wire products and product made by this method
US4601165A (en) * 1984-06-07 1986-07-22 Akzo Nv Method of manufacturing a compact, multilayer single strand reinforcing cord for use in elastomeric products and a cord produced by this method
US4724663A (en) * 1984-07-09 1988-02-16 N.V. Bekaert S.A. Steel cord twisting structure
US4936647A (en) * 1985-05-15 1990-06-26 Babcock Industries, Inc. High tensile strength compacted towing cable with signal transmission element
US4915490A (en) * 1987-01-13 1990-04-10 Stc Plc Optical fibre cable with crush-resistant tube
US5303537A (en) * 1990-06-28 1994-04-19 The Goodyear Tire & Rubber Company Apparatus for making metallic cord
US20060096107A1 (en) * 2004-11-05 2006-05-11 Hickey James K Lay out line
US7231722B2 (en) * 2004-11-05 2007-06-19 Stud Line Tool Company Lay out line
US7500345B2 (en) * 2006-11-07 2009-03-10 The Goodyear Tire & Rubber Company Mandrel for a tubular strander
US20080105327A1 (en) * 2006-11-07 2008-05-08 James Christopher Kish Mandrel for a tubular strander
CN102296473A (zh) * 2011-08-19 2011-12-28 甘肃荣信电材科技有限公司 能提高钢丝绳捻制质量的压丝环
US20150152596A1 (en) * 2012-07-02 2015-06-04 Casar Drahtseilwerk Saar Gmbh Device and method for producing a strand or a cable
US10190256B2 (en) * 2012-07-02 2019-01-29 Casar Drahtseilwerk Saar Gmbh Device and method for producing a strand or a cable
US20170370028A1 (en) * 2016-06-28 2017-12-28 Loftex Usa Llc Method for producing single-hole ultra soft yarns
US20170370022A1 (en) * 2016-06-28 2017-12-28 Loftex Usa Llc Method for producing multi-hole ultra soft yarns
US20170370029A1 (en) * 2016-06-28 2017-12-28 Loftex Usa Llc Method for producing multi-hole ultra soft yarns
US10538865B2 (en) * 2016-06-28 2020-01-21 Loftex Usa Llc Method for producing multi-hole ultra soft yarns
US10655247B2 (en) * 2016-06-28 2020-05-19 Loftex Usa Llc Method for producing multi-hole ultra soft yarns
US10655246B2 (en) * 2016-06-28 2020-05-19 Loftex Usa Llc Method for producing single-hole ultra soft yarns

Also Published As

Publication number Publication date
BE782688A (fr) 1972-08-16
FR2136723A5 (enrdf_load_stackoverflow) 1972-12-22
GB1373814A (en) 1974-11-13
IT956235B (it) 1973-10-10
NL7205582A (enrdf_load_stackoverflow) 1972-10-30
LU65245A1 (enrdf_load_stackoverflow) 1972-07-14
DE2219816A1 (enrdf_load_stackoverflow) 1972-11-16

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