EP0009924A1 - Ficelle thermoplastique et procédé et appareil pour sa fabrication - Google Patents

Ficelle thermoplastique et procédé et appareil pour sa fabrication Download PDF

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Publication number
EP0009924A1
EP0009924A1 EP79301995A EP79301995A EP0009924A1 EP 0009924 A1 EP0009924 A1 EP 0009924A1 EP 79301995 A EP79301995 A EP 79301995A EP 79301995 A EP79301995 A EP 79301995A EP 0009924 A1 EP0009924 A1 EP 0009924A1
Authority
EP
European Patent Office
Prior art keywords
monofilaments
bundle
twine
twisted
synthetic
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.)
Withdrawn
Application number
EP79301995A
Other languages
German (de)
English (en)
Inventor
William Dewhurst
John Bernard O'neil
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.)
ExxonMobil Technology and Engineering Co
Original Assignee
Exxon Research and Engineering Co
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
Priority claimed from US05/946,889 external-priority patent/US4192127A/en
Priority claimed from US06/946,888 external-priority patent/US4228641A/en
Application filed by Exxon Research and Engineering Co filed Critical Exxon Research and Engineering Co
Publication of EP0009924A1 publication Critical patent/EP0009924A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
    • D02G3/402—Yarns in which fibres are united by adhesives; Impregnated yarns or threads the adhesive being one component of the yarn, i.e. thermoplastic yarn
    • 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
    • D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
    • 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
    • D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
    • D07B5/006—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties by the properties of an outer surface polymeric coating
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/10—Rope or cable structures
    • D07B2201/1088—Rope or cable structures false twisted

Definitions

  • This invention relates to synthetic monofilament twines. More particularly, this invention relates to synthetic monofilament twines produced from a bundle of oriented thermoplastic monofilaments which are twisted along the length of the twine and which are bound by a thermoplastic material which extends around the bundle in spiral form.
  • Another aspect of the present invention relates to a method and apparatus for producing the twine described above from thermoplastic materials.
  • U.S. Patent No. 2,552,210 to W. B. Parker discloses a ply yarn comprising a bundle of natural fibers entwined together with a fine filament nylon yarn.
  • the ply yarn has a twist imoarted to it.
  • U.S: Patent No. 3,315,454 to Enerza discloses a synthetic twine suitable for forming knots in baling, tying and other automatic knot tying machines.
  • the twine comprises a plurality of filaments of a thermoplastic resin and containing dispersed therein a gas so as to produce foamed filaments.
  • U.S. Patent No. 3,446,002 to Kip p an discloses a twine comprised of a bundle of substantially parallel synthetic monofilaments with a synthetic binder material in thin band form wrapped around and fused to the outer monofilaments.
  • U.S. Patent No. 3,577,873 discloses a core yarn comprising a core component of set false twisted synthetic continuous multifilaments and at least one wrapping component of synthetic continuous filaments formed in helices around the core components, the direction of the helices being reversed at intervals along the yarn.
  • U.S. Patent No. 3,769,787 to Rosenstein et al discloses a multiple filament yarn of synthetic textile useful for knitting, winding and weaving which multi-filament textile yarn has continuously disposed thereabout two special wrapper filaments wrapoed in a generally helical path about the core filaments of the yarn, one wrapper being disposed in a clockwise manner and the other wrapper being disposed in a counterclockwise manner.
  • U.S. Patent No. 3,851,457 to Waters discloses a ore yarn comorised of a set false twisted core and a wrapoer of filaments formed in reversing helices.
  • U.S. Patent No. 3,415,919 to KioDan discloses a method of oroducing a twine by extruding a thermoplastic material in a spiral onto an untwisted bundle of oriented thermoplastic monofilaments.
  • prior art fiber twine of necessity is twisted in order to transmit stress fro one fiber to another and develop the continuity of tensile strength of the cord.
  • the patentee notes that monofilament twine prior to his development was twisted so that the monofilaments contained themselves by intertwined helixes to form a unit twine or cord.
  • Kippan notes several disadvantages of twisted twine
  • the primary disadvantage is a weaker twine, since the helixes are able to assume only a portion of an applied tensile load, whereas in a oarallel alignment of monofilaments each filament is able to fully bear an applied tensile load.
  • the tensile strength of a twine having all of the monofilaments aligned is the sum of the tensile strengths of each filament (in practice tensile strength is slightly less)
  • Kiooan Another disadvantage of the twisted cord according to Kiooan is that it tends to untwist when it is slack, forming snarls which can cause problems in mechanical hay balers.
  • U.S. Patent 2,953,418 shows the use of a composite yarn of Teflon and Dacron or nylon in the preparation of a molded resin bearing.
  • U.S. Patent 2,281,647 deals with a method whereby staple fibers are firmly anchored in the body of yarn containing said fiber utilizing a technique whereby one or more relatively fine threads which carry a solvent or softening agent are embedded in the structure of the spun yarn.
  • U.S. Patent 4,095,403 discloses a method in which two yarns, one of which is a cord yarn and one an effect yarn, are fed to a junction point and then fed together through a heat treatment zone and assembled into a fancy yarn in a false twisting step, the cord yarn being provided with a thermoplastic binder upstream of the junction point, the heat treatment in the zone being sufficient to develop the hot melt adhesive properties of the thermoplastic binder.
  • U.S. Patent 3,315,455 discloses a synthetic rope having improved structure comprising a core of unfoamed synthetic filaments and an enclosing layer of foamed polymer filaments.
  • U.S. Patent 3,332,228 discloses polypropylene baling twine which is certainly pertinent in its broad terminology to the present claimed invention.
  • the twine is made from strips or ribbons of unidirectionally oriented isotactic polypropylene film, which are fibrillated by the act of twisting the strip or strips which set the film as a twine.
  • This patent discloses the possibility of using a foam poly p ro- pylene in preparing the twine.
  • U.S. Patent 3,593,509 relates to an apparatus and method for stranding a twisted unit of cable.
  • twine or cord such as described by Kippan having parallel monofilaments bound by an extruded binder, also is disadvantageous in mechanical balers.
  • the straight monofilaments can be deformed in the knotting operations such that individual fibers break out between the spiral binding.
  • the structure becomes less homogeneous in the knotting step and a protruding monofilament may catch in the mechanism.
  • twines having consistent characteristics throughout the length thereof, and which are rot resistant and resistant to ultraviolet radiation. It is a further object of the invention to provide a synthetic twine having monofilaments twisted with resoeon to each other along the length of the twine, and a means ror retaining the monofilaments in their twisted relationship to each other without interfering with the flexibility of the twine.
  • a twine comprising a core bundle of continuous synthetic oriented monofilaments extending lengthwise and twisted so as to contain from 3 to about 30 turns per linear foot of monofilament twine and a synthetic binder in thin band form made from a material compatible with the monofilament material and spirally wound in a direction reverse to the core bundle twist so as to contain from about 8 to 30 spirals per linear foot of the twisted monofilaments, the spirally wound band being adhered to the monofilaments along the length of the twisted core bundle.
  • the twist imparted into the core bundle of monofilaments generally is of the false twist tyoe.
  • a "false twist” as the term is generally used and understood herein is a twist which is applied to a filament or a bundle of filaments by a torque apolied thereto, which will reverse and return to the zero twist upon release of the torque.
  • the method of making twine according to the oresent invention comprises continuously drawing a bundle of substantially parallel synthetic monofilaments along a path, imparting a false twist to said bundle to monofilaments, and directing a stream of molten synthetic material, which is compatible with the monofilament material, onto the outer surface of said moving, twisted monofilament bundle to form a spiral band therearound.
  • the molten material is directed onto the surface of the bundle at a temperature and pressure sufficient to cause the band which is formed to fuse to the contacted monofilaments, but without materially affecting the strength of the fused monofilaments.
  • the monofilaments on the inside of the bundle are free to move relative to each other.
  • the apparatus of the invention comprises a oath along which a bundle of substantially parallel synthetic monofilaments having a false twist therein can be continuously drawn, means for directing a continuous stream of molten synthetic material which is compatible with said monofilament material onto the outer monofilaments of the twisted moving bundle, thereby forming a spiral band therearound, means for supplying said molten synthetic material to said directing means at a temperature and pressure sufficient to cause the formed spiral band to fuse with said outer monofilaments without materially affecting the strength of said outer monofilaments, whereby the other monofilaments of said bundle are left free to move relative to each other, and a false twisting means for imparting a false twist to said bundle of monofilaments at a noint prior to said directing means whereby said bundle is characterized as having a false twist therein along said path.
  • twine as used herein is understood to include twine, cord, yarn and the like.
  • the yarns of the oresent invention are preferably made from synthetic thermoplastic resins and the present apparatus and process are particularly suited for the use of preferred synthetic thermoplastic materials, such as polyethylene, polypropylene and their copolymers.
  • preferred synthetic thermoplastic materials such as polyethylene, polypropylene and their copolymers.
  • synthetic materials which may be employed include oolyamides, e.g., poly (hexamethylene adioamide), polyesters, such as polymers of terephthalic acid or isoohthalic acid and a lower glycol, e.
  • the binder band must be formed of a material that is compatible with the monofilament material such that they both react to heat in substantially the same manner.
  • the spiral binders are prepared from thermoolastic resins or thermoplastic rubbers, such as, for examole, polypropylene, polyethylene, pclyamide, polyesters, polycarbonates, polyvinyl tyoes, copolymers of ethylene and propylene and ethylene-propylene rubbers.
  • Another preferred rubber is a block copolymer comprising polystyrene end blocks with polyolefin rubbers as the midblock such as KRATONR oroduced by Shell Chemical Company.
  • the filaments may have a wide variety of cross-sections in addition to the usual circular cross-section, such as, eliolical, Y-shaped, triangular, heart-shaoed, square and the like.
  • the number of continuous monofilaments emoloyed in the twine can be from about 40 to about 340 and preferably from about 95 to 195 monofilaments per twine bundle. Most preferably, the twine bundle comprises about 130 continuous monofilaments. The monofilaments are generally wound about with one continuous spiral band.
  • the twine will have a denier in the range of 5000 to 50,000 more preferably about 20,000 to about 40,000 with each monofilament falling in the range of 50 to about 1000 denier, and preferably about 200 denier.
  • the false twist will generally be applied at a rate of 3 to 30 turns per linear foot of monofilament, preferably about 5 to 15 turns per linear foot most preferably 6 turns.
  • the binder band will be applied at the rate of 8 to 30 spirals per linear foot of twines, and preferably about 10 to about 16 spirals per linear foot of twine.
  • the monofilament bundle will generally be drawn through the apparatus at 200 to 2000 feet per minute, preferably about 500 to 1500 feet per minute.
  • Fig. 1 shows a process line according to the present invention.
  • a plurality of thermoplastic monofilaments 4 are conveyed along a path, the axis A-A, through a die assembly 5 attached to an extruder 2, hence through cooler tank 6 through false twisting means 8 and into drawing apparatus 12 through which the completed twine 10 is passed to the take up apparatus (not shown).
  • the principal difference in this apparatus and that which would ordinarily be found in facilities making monofilament twine according to the prior art is the twister 8.
  • thermoplastic monofilament is conventionally extruded by means well known in the art and which forms no part of this invention.
  • the filaments are oriented along the axis of the twine in known manner.
  • the monofilaments 4 are preferably made of a bundle of substantially parallel, oriented thermoplastic monofilaments; the oresent bundle 4 is twisted at a point 3 prior to entry into die assembly 5, so that a bundle having 3 to 30 turns per linear foot oasses into die assembly 5 wherein a continuous spiral band 18 of a compatible thermoplastic material is aoplied to the twisted bundle of monofilaments 4.
  • the spiral band is comprised of a material which is compatible with the monofilament material and is applied at a temperature and pressure, so as to fuse the band to only the outer layer of monofilaments.
  • a conventional cooling section such as that shown, having a water quench 6, drying soonges 7 and air drying means 9, which is employed to solidify the extruded spiral band 18.
  • the cooling of band 18 which is fused to the outer monofilaments serves to entrap some of the false twist or the characteristics of the twisted monofilament bundle.
  • the twist in the monofilament bundle 4 is obtained by having a false twisting means 8 downstream of the extruder 2.
  • the twist is obtained by the false twister grasping the banded monofilament bundle 4, as for examole with the arrangement shown in Fig. 6, and continuously rotating the Albanyoing portion of the false twister 360° around an axis parallel to the axis A-A of the monofilament bundle 4, thereby extending the twist upstream along the bundle 4, through the cooler 6, through the die assembly 5 and back to ooint 3 upstream of the extruder 2.
  • the twisted monofilaments are freed of the torque from the false twister and would normally return to their untwisted, longitudinal state, which is also their tendency here, but for the band 18 which is fused to the outer monofilaments.
  • a segment of twine 10 produced according to the present invention is illustrated.
  • the monofilaments 14 (inner) and 16 (outer) are shown to have a Z twist, which is a counterclockwise twist.
  • the spiral band 18 (in this embodiment) has an S twist, which is clockwise.
  • the twist would normally not be present in the twine, unless it were heat treated to set the twist in the monofilament.
  • the psiral band or binder 18 is fused to the twisted outer monofilaments, thereby capturing at least some of the twist in the final product 10. Thereis a slight torque thus captured in the monofilaments which are seeking to return to their static or dead untorqued state.
  • the spiral band 18 could have the same twist configuration as the monofilaments, and it would also capture some torque in the monofilaments in the same fashion, since the sDiral band 18, is itself in the static or dead state and will resist the movement of the torqued monofilaments, to which it is bound.
  • either the monofilament bundle or the binder may be S or Z when different configurations are desired.
  • the monofilament bundle and binder have the same twist configuration, i.e., both S or both Z twist, the product has been found to be a very flat band of monofilaments with the binder therearound.
  • the soiral band or binder 18 is illustrated as a single band, it should be appreciated that two or more bands may be used and in fact normally two bands would be emoloyed.
  • Figs. 3-5 illustrate the die assembly 5 and show the relationship of the monofilament bundle 4 and the twist beginning at point 3 prior to the die assembly 5.
  • the die assembly 5 includes a crosshead 28 having a die passage 22 extending therethrough.
  • An elongated die 24 is rotatably mounted in and extends through passage 22.
  • This die has an axial bore 46 extending therethrough which is just large enough to accommodate a moving monofilament bundle 4 which has been oreviously formed by conventional means not shown and which may be twisted in a counterclockwise direction and which may be drawn through the bore in any suitable manner. such as by the drawing apparatus 12 (which must be located down stream of the twister 8).
  • Die 24 is rotated around the longitudinal axis thereof in any suitable manner.
  • the direction of rotation is opposite to the twist direction.
  • a pulley 38 may be mounted on an elongated tubular drive shaft 44 rotatably mounted in bearing 36 of a plurality of support blocks 42.
  • Pulley 38 is rotated by a drive belt 40 which, in turn, extends to an appropriate motor means (not shown).
  • Suitable means is provided for directing one or more streams of molten synthetic material through rotating die 24 into bore 46 thereof and onto the outer surface of bundle 4, as the latter moves linearly through said bore.
  • An annular groove 50 is formed in the outer surface of die 24, and one or more passages 52, extend from said groove 50 inwardly and open into bore 46. These passages or noxxles are oreferably taoered inwardly from the groove towards the bore.
  • the molten synthetic material is directed into annular groove 50 through passage 48 extending through crosshead 28.
  • the molten material is fed to passage 48 by a standard plastic extruder 2.
  • annular grooves 26 and 34 are provided in the outer surface of die 24 on opposite sides of groove 50. Passages 30 and 32 in crosshead 28 communicate with grooves 26 and 34, respectively and extend downward therefrom, and may be connected by pipes to extend away from the apparatus.
  • the false twisting means 8 as shown in Fig. 6, consist of housing 60 affixed to a suooort 62 by support members 64. Each support member 64 is attached to the supoort 62 and housing 60 on opposite sides of the housing. Each support member 64 has a bore 72 therethrough, a support bearing 66 and a biased bearing 70, both of said bores 72 being aligned with each other.
  • a rotatably mounte ' d shaft 76 having a bore 80 therethrough and a pulley 78 mounted thereon extends through the bore 72 of one support member into housing 60.
  • a second rotatably mounted shaft 82 having a bore 84 therethrough extends through the bore 72 of the other support member 64 into housing 60, the bores 80 and 84 being aligned.
  • Mounted between the two shafts 76 and 82 is plate 86.
  • Rotatably mounted to said plates are two sheaves or rollers 74.
  • the rollers 74 are mounted diagonally on opposite sides of the axis of the bores 80 and 84, by means of oins 75, so that rollers 75 are free to rotate.
  • the bearings 70 are biased by means 68 against shafts 76 and 82 respectively.
  • Pulley 78 is rotated by a drive belt 88, which in turn is connected to an appropriate motor (not shown).
  • the bundle 4 which has had the spiral band 18 applied in the crosshead 5 enters the housing 60 through the bore 80 of shaft 76, passes around one roller 74 then around the other roller 74 and hence out of the housing through bore 84 of shaft 82.
  • a slight tension on the twine 10 by the drawing apparatus 12 allows the twine 10 to be gripped in this manner so that as the shaft 76 is rotated the entire assembly comprised of the two shafts 76 and 82, the attached plate 86 and the rollers 74 mounted thereon, rotates about the longitudinal axis A-A of the twine thereby twisting the twine 10.
  • Bushing 90 tightly abuts the twine thereby forcing the twisting to extend upstream to point 3 on the bundle 4. This is only one means of twisting the monofilament bundle and any means which will achieve this function may be employed.
  • each monofilament bundle on a sheave there may be more than one monofilament bundle on a sheave, for example, two or three independent bundles may be on one sheave provided the sheaves or rollers 74 are wide enough.
  • the twist is extended down each bundle and the bundles may be twisted about one another, however, this has no adverse effect.
  • the individual oroduct twines separate as they leave the twister 8 and are taken up seoarately. This allows for an economy of equipment, since only one cooling section and twister are required for the oreoaration of a plurality of twines.
  • die 24 is rotated at a desired speed.
  • the monofilament bundle 4 is continuously drawn through the bore of the die by the drawing aooaratus 12 and twisted by twisting means 8 such that a bundle of monofilaments having a desired number of turns per foot is passed into the die.
  • the compatible synthetic material is directed to the extruder 2 through oassage 48 and annular passage 50 into radial passages or nozzles 52 in the rotating die.
  • the two passages form two spiral bands on the twisted bundle 4.
  • the compatible molten material is at a temperature and pressure to fuse to the outer monofilaments it contacts. Any molten material moving along bore 22 over the outer surface of die 24 drains off through low pressure passages 30 and 32.
  • the temoerature of the molten thermoplastic extruded onto the twisted monofilament bundle must be adjusted to ore- vent damage or degradation of the monofilaments, which those operating the process need to routinely determine for the materials emoloyed.
  • the adjustment of the rate of speed at which the monofilament bundle is drawn along its oath, the rate of twist in relation thereto and the rate of spiral band application are all adjustable as desired or required for any particular thermoplastics employed.
  • the monofilaments and band material can be foamed by dispersion of gas through the filaments at about 16 to about 66% by volume based on the volume of the resin and more preferably, at about 32% by volume based on the volume of the resin.
  • the spiral band can be foamed alone or both the monofilaments and the spiral band can be foamed. Processes for preparing the foaming resin are well known and such processes are disclosed in, for example, U.S. Patent No. 3,214,234 of Bottom- ley and U.S. Patent No. 3,315,454 of Carranza.
  • Suitable stabilizer or pigments can be added to the resins which form the monofilaments and binder in order to protect them against ultraviolet degradation.
  • suitable fillers and blowing agents may be added to the resins for monofilament and binder in order to change the density or bulkiness prooerty.
  • binder bands also can be of any desired cross section, although it is preferably to use bands of rectangular or oval cross section.
  • the present invention provides a means to produce a twine which has some loss of tensile strength but which has better characteristics for use, especially in tying the knot and knot strength, than prior art twine made without the false twist.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP79301995A 1978-09-28 1979-09-25 Ficelle thermoplastique et procédé et appareil pour sa fabrication Withdrawn EP0009924A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US05/946,889 US4192127A (en) 1978-09-28 1978-09-28 Method and apparatus for making monofilament twines
US946889 1978-09-28
US06/946,888 US4228641A (en) 1978-09-28 1978-09-28 Thermoplastic twines
US946888 1995-03-08

Publications (1)

Publication Number Publication Date
EP0009924A1 true EP0009924A1 (fr) 1980-04-16

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Application Number Title Priority Date Filing Date
EP79301995A Withdrawn EP0009924A1 (fr) 1978-09-28 1979-09-25 Ficelle thermoplastique et procédé et appareil pour sa fabrication

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EP (1) EP0009924A1 (fr)
ES (3) ES484513A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106835781A (zh) * 2017-03-30 2017-06-13 义乌市源德进出口有限公司 一种救生索制造机

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1369618A (fr) * 1963-02-28 1964-08-14 Wall Rope Works Perfectionnements aux cordages et à leurs procédés de fabrication
US3315454A (en) * 1964-03-09 1967-04-25 William L Carranza Synthetic baling and tying twines
US3405516A (en) * 1966-08-22 1968-10-15 Wall Ind Inc Yarn, cordage, ropes, and the like
US3415919A (en) * 1965-07-02 1968-12-10 Delta Rope & Twine Ltd Method and apparatus for making twine
FR1559728A (fr) * 1966-12-24 1969-03-14
US3446002A (en) * 1965-03-22 1969-05-27 Delta Rope & Twine Ltd Monofilament twines
US3589960A (en) * 1967-05-29 1971-06-29 Wall Ind Inc Method of making non-twisted cordage
DE2537680A1 (de) * 1975-08-23 1977-03-03 Hoechst Ag Verfahren zur herstellung eines vorgarnes
US4067362A (en) * 1976-02-02 1978-01-10 A. O. Smith-Inland, Inc. Reinforced ribbed tubular structure and method of making same

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1369618A (fr) * 1963-02-28 1964-08-14 Wall Rope Works Perfectionnements aux cordages et à leurs procédés de fabrication
US3315454A (en) * 1964-03-09 1967-04-25 William L Carranza Synthetic baling and tying twines
US3446002A (en) * 1965-03-22 1969-05-27 Delta Rope & Twine Ltd Monofilament twines
US3415919A (en) * 1965-07-02 1968-12-10 Delta Rope & Twine Ltd Method and apparatus for making twine
US3405516A (en) * 1966-08-22 1968-10-15 Wall Ind Inc Yarn, cordage, ropes, and the like
FR1559728A (fr) * 1966-12-24 1969-03-14
US3589960A (en) * 1967-05-29 1971-06-29 Wall Ind Inc Method of making non-twisted cordage
DE2537680A1 (de) * 1975-08-23 1977-03-03 Hoechst Ag Verfahren zur herstellung eines vorgarnes
US4067362A (en) * 1976-02-02 1978-01-10 A. O. Smith-Inland, Inc. Reinforced ribbed tubular structure and method of making same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106835781A (zh) * 2017-03-30 2017-06-13 义乌市源德进出口有限公司 一种救生索制造机

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ES246564Y (es) 1980-10-01
ES485639A1 (es) 1980-09-01
ES484513A1 (es) 1980-08-16
ES246564U (es) 1980-04-01

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