US3508389A - Process and apparatus for producing novelty yarns - Google Patents

Process and apparatus for producing novelty yarns Download PDF

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Publication number
US3508389A
US3508389A US756850A US3508389DA US3508389A US 3508389 A US3508389 A US 3508389A US 756850 A US756850 A US 756850A US 3508389D A US3508389D A US 3508389DA US 3508389 A US3508389 A US 3508389A
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United States
Prior art keywords
yarn
twist
effect
yarns
core
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Expired - Lifetime
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US756850A
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English (en)
Inventor
Remy Chatin
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Moulinage et Retorderie de Chavanoz SA
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Moulinage et Retorderie de Chavanoz SA
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Priority claimed from FR69048941A external-priority patent/FR1561939A/fr
Priority claimed from FR69049361A external-priority patent/FR93967E/fr
Priority claimed from FR69049767A external-priority patent/FR94087E/fr
Application filed by Moulinage et Retorderie de Chavanoz SA filed Critical Moulinage et Retorderie de Chavanoz SA
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    • 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
    • D02G1/00—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics
    • D02G1/02—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist
    • D02G1/0206—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting
    • D02G1/024—Producing crimped or curled fibres, filaments, yarns, or threads, giving them latent characteristics by twisting, fixing the twist and backtwisting, i.e. by imparting false twist by false-twisting with provision for imparting irregular effects to the yarn
    • 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
    • D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
    • D02G3/343—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns using hollow spindles

Definitions

  • the present invention relates to a process and apparatus for producing novelty yarns; more particularly, the present invention is directed to a novel process and apparatus for producing novelty yarns, i.e. of the boucl, undulatedor knop type for example through assembly of a core yarn and an effect yarn by false twisting, with subsequent binding of the assembly with a binder yarn.
  • a process for the production of nove ty yarns e.g. of the boucl, undulated or knop type for example, is shown in French Patent 1,493,577, such process being one wherein a false twist is applied to an assembly of a core yarn and an effect yarn overfed relatively to the core yarn, the false twisted assembly of core yarn and effect yarn being subsequently bound by a binder yarn prior to disappearance of the false twist.
  • Such process requires operation in at least two stages.
  • the first stage generally comprises the assembly of the core and effect yarn, while the second stage comprises the fixation of the loops or other variations with the binder yarn.
  • the necessity of having such two distinct stages comprising two distinct operations such as illustrated in French Patent 1,493,577 is disadvantageous from an economic standpoint. Accordingly, it is desirous to eliminate such use of at least two stages and at least two distinct mechanical operations in a manner as to eliminate the inherent deficiencies and disadvantages of such previously employed processes.
  • a further object of the present invention comprises a novel process and apparatus for the production of novelty yarns of the boucl, undulated or knop type characterized in the improvement associated with binding the assembly of core yarn and effect yarn with a binder yarn at the moment of locking of the false twist, i.e. simultaneously with locking of the false twist.
  • FIGURE 1 is a diagrammatic representation of the method and apparatus employed in accordance with the present invention.
  • FIGURE 2 is a diagrammatic representation of amodification of such process and apparatus comprising the irregular distribution of effect yarn or core yarn;
  • FIGURE 3 is a diagrammatic representation of the process and apparatus illustrating an overfeed mechanism with variable excess delivery
  • FIGURE 4 is a diagrammatic representation of a further embodiment of the present invention utilizing a conventional spindle, i.e. double twist spindle.
  • the process of the present invention comprises a new single-stage process for the manufacture of novelty yarns wherein a false twist assembly of a core yarn and an effect yarn supplied in excess with respect to the core yarn is subsequently bound with a binder yarn before disappearance of the false twist.
  • the process of the present invention comprises an improvement in such conventional process for the production of novelty yarns, such improvement residing in the binding of the assembly of core yarn and effect yarn with the binder yarn at the moment of locking of the false twist.
  • the locking of false twist can occur only once or several times, this being merely a matter of choice dependent somewhat on the type of novelty yarn to be produced.
  • locking or locking of the false twist is meant the operation which consists in reversing by some means the direction of the false twist so as to cause a twist upstream from the lock point and an untwisting downstream from the lock point.
  • the locking of the false twist in accordance with the present invention can occur once or several times depending on the novelty yarn and effect desired.
  • the improvement associated with the process and apparatus of the present invention comprises the binding of the core yarn and effect yarn assembly at the moment of locking of the false twist.
  • the process of the present invention comprises an improvement in that process for the production of novelty yarns wherein an effect yarn is overfed relatively to the core yarn in the formation of the assembly false twisted and bound at the time of the locking of the false twist.
  • an effect yarn is overfed relatively to the core yarn in the formation of the assembly false twisted and bound at the time of the locking of the false twist.
  • the overfeed of effect yarn can vary within wide limits.
  • the effect yarn is fed to the apparatus so as to be present based upon the core yarn in an excess of from 10% to 300%.
  • the overfeed rate of effect yarn is defined as the product x100 of the ratio of the linear excess speed of supply of the effect yarn to the rate of supply of the core yarn
  • the rate of overfeed of effect yarn should be at least 40%, the optimum value of over- Eeed effect yarn being supplied to obtain the boucl yarn being readily determined by a person of ordinary skill in the art as a function of the operating conditions and the desired results.
  • the binding produced by the binder yarn can also be effected by the false twist.
  • all of the lengths of the novelty yarn that ire produced retain their initial twist in the finished product.
  • the overfeed rate of :he effect yarn can be variable or not variable.
  • :he binder yarn itself can be supplied regularly or irfegularly and under certain circumstances can be supplied n excess.
  • the effect yarn that is employed in the :ore yarn-effect yarn assembly can be regularly or ir- 'egularly distributed on the core yarn. This is particularly me where a knop yarn is desired.
  • the regular distribution )f the effect yarn on the core yarn where desired for )articular purposes can be most advantageously effected Jy the motion of free oscillation of the effect yarn in a firection perpendicular to the direction of advance of the :ore yarn.
  • he yarns employed in the process and in connection with he apparatus of the present invention may be any natural, trtificial or synthetic material.
  • the arns employed in accordance with the process of the )resent invention can comprise wool, cotton, cellulose tcetate and similar yarns, synthetic polyamide and poly- :ster yarns as well as mixtures of these with any and all trtificial or natural yarns generally employed in the iI'OdllCiiOIl of novelty yarns.
  • the apparatus employed in accordance with he present invention comprises a feed mechanism for at east two yarns with means to provide overfeed rate of me of the yarns, i.e. the effect yarn relative to the other, .e. the core yarn
  • t contains a false twist element comprising a turning tube that bears a support for the binder yarn, such support for the binder yarn being associated with a twist locking element furnished at the twist locking point of a yarn guide.
  • This yarn guide element can comprise any suitable and conventional means such as a traveller or eye.
  • other equivalent means generally employed in the production of novelty yarns can be utilized for the yarn guide element in accordance with the apparatus of the present invention.
  • the turning tube comprising the false twist element employed in accordance with the apparatus of the present invention preferably is a hollow spindle such as that conventionally employed in mills producing novelty yarns.
  • Such hollow spindle can be surmounted by a guide element furnished with an eye mounted in free rotation at the top of the hollow spindle or associated with the traveller of a fixed ring disposed around the spindle.
  • the binder yarn is also given a false twist, it is advantageous that the two false twisting adjoining operations for core yarn or effect yarn on the one hand, and core and effect yarns with binder yarn on the other, occur simultaneously.
  • an apparatus is employed wherein the support for the binder yarn is substantially fixed with the twist lock element being furnished at the point of locking of a yarn guide rigidly connected to the turning tube.
  • the false twist element or device can comprise a double twist type spindle.
  • a double twist type spindle as embodied by French Patent 1,300,575 presents at its downstream part an extension of the axial passage of the spindle, a false twise tip rigidly connected to the rotary element of the spindle. It receives in addition to a yarn that is axially drawn from the fixed bobbin mounted on the stator of the double twist spindle, an assembly deriving from distinct fixed supports for the spindle, the spindle being associated with at least one yarn guide disposed axially upstream of the spindle, causing formation of a balloon by the assembly when the rotor of the spindle turns.
  • a double twist type spindle which can be employed in accordance with the apparatus of the present invention as a further embodiment of the present invention is a conventional yarn producing element such as described in French Patent 1,300,575.
  • the device or element comprising the feed mechanism for at least two yarns can comprise any conventional suitable means, such as a deliverer.
  • a deliverer In the case of variable overfeed, such an element or device can comprise for example, a mechanism with electrical clutch control, or with mechanical control programmed for variation of speed.
  • a simple means for the irregular distribution of the yarn comprises two rolls with controlled delivery rate, the axes of rotation of such rolls being staggered with reference to the path of the core yarn so as to distribute the effect yarn in a direction that is substantially perpendicular to the direction of advance of the core yarn.
  • an additional means comprising a movable finger driven in a reciprocating motion, such finger being disposed in the path of the effect yarn downstream 'of the driven rolls and upstream of the point of junction of the core yarn and effect yarn.
  • Such movable finger driven in a reciprocating motion exerts an intermittent drawing action on the effect yarn, such drawing action or force being advantageously exerted substantially perpendicular to the direction of advance of the effect yarn.
  • the rate of rotation of the driven feed rolls for the effect yarn can be variable and, in addition, such rolls can even halt momentarily.
  • all of such modifications and various embodiments of both the process and apparatus of the present invention can be easily selected where novelty yarns of a particular type are desired for particular purposes.
  • FIGURE 1 diagrammatically illustrates the process and apparatus of the present invention.
  • a core yarn 1 is fed into a false twist device simultaneously with an effect yarn 2 by means of a delivery mechanism, not shown, of known conventional type, causing overfeed of the effect yarn relative to the core yarn.
  • the false twist device comprises a hollow spindle 3 with a control whorl 4 topped by a guide member 5 mounted in free rotation on the spindle head and having an eye 6.
  • the two yarns, core yarn 1 and effect yarn 2 are assembled by false twist, by passage through hollow spindle 3, then through the eye of guide member 5 where the false twist is locked by the action of a binder yarn 7 coming from a bobbin 8 carried by hollow spindle 3.
  • the novelty yarn then passes into guide loop 9 before being wound on any known conventional device, not illustrated.
  • the effect yarn 2 is distributed irregularly on the core yarn 1 by means of two driven rolls 10 and 11 which deliver the effect yarn 2 substantially perpendicularly to the direction of advance of the core yarn 1.
  • the effect yarn 2 accumulates then on the core yarn 1, executing a longitudinal oscillating movement on the core yarn 1.
  • a finger 12 disposed between rolls 10 and 11 and the meeting point of effect yarn 2 and core yarn 1 or any other equivalent location impresses upon the effect yarn 2 an oscillating motion upstream of the core yarn 1.
  • rolls 10 and 11 can be driven at varying r.p.m., the revolutions even being subject to a complete halt.
  • Such means can obviously be combined wtih means that produce a variable overfeed for the effect yarn 2, as shown in FIGURE 3.
  • the apparatus generally comprises a hollow spindle 3 driven by a motor 13 by means of a driven whorl 4.
  • the spindle 3 supports a bobbin 8 on which a binder yarn 7 is wound, and it is topped at its downstream end by a guide member 5 providing two eyes 6.
  • the means for varying the rate of overfeed of the effect yarn 2 comprise two drive rolls 14 and 15 mounted on a shaft that is rigidly joined to a counter plate 16 on which two clutch plates 17 and 18 are applied. Plates 17 and 18 receive their motion from two speed changers 19 and 20 and from gears 21 and 22 and chains 23 and 24.
  • These means of variation comprise a programmer 25 of known type that acts by means of two sweeping elements 26 and 27.
  • This device allows irregular and controlled overfeed of an effect yarn 2 that passes through the hollow spindle 4 at the same time as a core yarn 1.
  • the two yarns, core 1 and effect 2 then pass through eye 6 where they are bound by the yarn 7.
  • the product then passes through guide loop 9 before being received on a winding system, not illustrated.
  • the apparatus comprises a hollow spindle associated with a guide but other equivalent means can be utilized, such as a fixed ring presenting a traveller, or even an assembly spindle of the double twist type as described in French Patent 1,300,575 as i1- lustrated in FIGURE 4.
  • a core yarn 1 is drawn with rather strong tension at overfeed of a bobbin 34, passing over a tensioning device 35. It then is combined with an effect yarn 2 supplied in excess by a set of driven rolls 37 and 38, passing through an eye 36.
  • the feed means for the effect yarn is of any known type.
  • the assembly formed by the core yarn 1 and the effect yarn 2 passes over a bar 40 which is rigidly connected with a turning plate 39.
  • the assembly is bound with a binder yarn 7 in a false twist device comprising a hollow tube 41 which bears a yarn deflector 42 and yarn guides 43 and 44.
  • the binder yarn 7 is drawn from a bobbin 45 mounted on stationary bobbin holder 46, which is immobilized by magnets 47 and 48.
  • the bobbin holder 46 presents an axial passage 49 for binder yarn 7.
  • the product is then withdrawn via hollow shaft 50- of tube 41 and then wound on a bobbin 51.
  • a boucl yarn was prepared by the combination of a polyhexamethylene adipamide yarn (polyamide 6 6) 44 d. tex. (40 denier), 13 filaments, presenting, a Z twist of 20 turns to the meter (t./m.), with a cellulose acetate yarn tex. (150 denier), 13 filaments, presenting a Z twist of 100 t./m., overfed by 50% excess. Binding was effected by a 6 6 polyamide binder yarn (44 d. tex./40 denier/13 filaments) with a 20 t./m. Z twist.
  • the take up rate was 6 m./min.
  • the spindle turned at 6000 r.p.m. (t./min.) which corresponds to 1000 false twist turns to the meter. Since the spindle was rotated clockwise, the false twist produced was an S twist and the twist of the assembled yarns with the binder yarn was a Z twist.
  • the product produced had small, regularly spaced loops.
  • Example II Example I was repeated except that the overfeed of the effect yarn was only 15%, thereby producing undulated yarn instead of a boucl since the excess feed of the effect yarn was insufficient to completely close the loops so they appear as undulations on the finished yarn.
  • a knop yarn was made by combining a polyhexamethylene adipamide yarn (polyarnide 6 6) 44 d. tex. (40 denier) 13 filaments, presenting a 2-0 t./m. Z twist, with a 200 d. tex. denier) 13 filaments cellulose acetate yarn presenting a 100 t./m. Z twist overfed by 70% excess.
  • the assembled yarns are bound with a polyamide 6 6 binder yarn, 44 d. tex. (40 denier) 13 filaments Z twist with 20 turns to the meter.
  • the winding speed is 6 meters/minute.
  • the spindle turned at 6000 r.p.m.
  • the product appeared with regularly spaced knops.
  • a novelty yarn was produced by combining a polyhexamethylene adipamide yarn (polyamide 6 6) 44 d. (40 denier) 13 filaments, presenting a 20 t./m. Z twist and a cellulose acetate yarn 165 d. tex. (150 denier) 13 filaments, presenting a 100 t./m. Z twist, such being supplied in excess with continuous periodic variations of the rate of overfeed supply ranging from 20% to 60% relative to the core yarn.
  • the take up rate is 6 m./min.
  • the spindle rotated at 6000 r.p.m.
  • Example IV was repeated except the variations of the rate of overfeed were irregular.
  • the yarn produced had very distinct zones of transition between the undulated and boucl (looped) effects.
  • a boucl yarn was produced by combining a polyhexamethylene adipamide yarn (polyamide 6- 6) 44 d. tex. (40 denier) 13 filaments, presenting a 20 t./m. twist, with a cellulose acetate yarn 110 d. tex. (100 denier) 32 filaments, presenting a 100 t./m. S twist, overfed by 70%.
  • Binding was effected with a binder yarn of polyamide 6 6, 44 d. tex. (4O denier) 13 filaments, With 20 t./m. Z twist.
  • the rate of feed of the effect yarn was 6 m./min, and that of the receiving spool 3.50 m./min.
  • the spindle turned at a rate of 5,150 r.p.m.
  • the product had small regularly spaced loops. Moreover, the initial twist of the various constituent yarns was retained in it.
  • Apparatus for the manufacture of novelty yarns comprising in combination, feed means to supply an assembly of at least two yarns, one in excess with respect to the other, a false twist means to provide a false twist to said assembly, said false twist means bearing means to support a binder yarn, a yarn guide means atop said false twist element, and a twist locking means located at the twist locking point of said yarn guide.
  • said false twist means comprises a turning tube.
  • twist locking means is rigidly joined to said turning tube and said binder yarn support. means is substantially stationary.
  • the apparatus of claim 11 further containing means for the irregular distribution of the effect yarn in said assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US756850A 1967-07-20 1968-09-03 Process and apparatus for producing novelty yarns Expired - Lifetime US3508389A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR69048941A FR1561939A (enrdf_load_stackoverflow) 1967-07-20 1967-07-20
FR69049361A FR93967E (fr) 1967-07-20 1967-11-22 Nouveau procédé de fabrication d'un fil fantaisie et dispositif a cet effet.
FR69049767A FR94087E (fr) 1967-07-20 1968-03-14 Nouveau procédé de fabrication d'un fil fantaisie et dispositif a cet effet.
FR49838A FR95049E (fr) 1967-07-20 1968-03-29 Nouveau procédé de fabrication d'un fil fantaisie et dispositif a cet effet.

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US3508389A true US3508389A (en) 1970-04-28

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US756850A Expired - Lifetime US3508389A (en) 1967-07-20 1968-09-03 Process and apparatus for producing novelty yarns

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US (1) US3508389A (enrdf_load_stackoverflow)
BE (1) BE715837A (enrdf_load_stackoverflow)
DE (1) DE1760927A1 (enrdf_load_stackoverflow)
ES (1) ES356191A1 (enrdf_load_stackoverflow)
FR (1) FR95049E (enrdf_load_stackoverflow)
GB (1) GB1198948A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683607A (en) * 1969-06-26 1972-08-15 Chavanoz Moulinage Retorderie Novel guide element for use in producing novelty yarns
US3717959A (en) * 1971-02-10 1973-02-27 Chavanoz Moulinage Retorderie Process for producing fancy effect yarns
US3868812A (en) * 1970-12-18 1975-03-04 Chavanoz Moulinage Retorderie Process and apparatus for the manufacture of effect yarn
US3889456A (en) * 1974-05-30 1975-06-17 Barden Corp Yarn covering spindle
US3913308A (en) * 1971-08-31 1975-10-21 Saint Andre Filature Method and apparatus for the manufacture of fancy yarns
US3928957A (en) * 1973-08-27 1975-12-30 Dso Textil Bg1973082724402 Method of and device for shaped effect yarns with or without ladders
US4010601A (en) * 1975-06-24 1977-03-08 Toyo Boseki Kabushiki Kaisha Method for manufacturing a fancy textured yarn provided with slubs
DE2849034A1 (de) * 1977-11-14 1979-09-27 Afa Corp Einheitsventil
US20100132537A1 (en) * 2008-12-03 2010-06-03 Generon Igs, Inc. Automatic lacer for bundles of polymeric fiber
CN105970368A (zh) * 2016-07-29 2016-09-28 江苏宇顺纺织有限公司 花式纱张力区分罗拉系统
CN106319715A (zh) * 2016-10-09 2017-01-11 江南大学 一种逐层紧密包缠纱及其生产方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRM20030449A1 (it) * 2003-09-30 2005-04-01 Arratex Srl Procedimento per la produzione di filati fantasia con fili formanti un ballon discendente.
CN104131386A (zh) * 2014-07-01 2014-11-05 无锡裕盛纱线有限公司 雪尼尔蜈蚣纱设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1874502A (en) * 1928-09-19 1932-08-30 Green Allan Apparatus for encircling threads
US2131893A (en) * 1935-10-26 1938-10-04 Charles C Jessen Process and apparatus for twisting threads
FR895678A (fr) * 1943-06-23 1945-01-31 Dispositif et métier pour l'enveloppement d'un fil en vue de la fabrication d'un fil bouclé non retordu
US3382655A (en) * 1967-08-01 1968-05-14 Wasserman Allan Apparatus and method for making metallic frieze yarns
US3439484A (en) * 1964-11-18 1969-04-22 Chavanoz Moulinage Retorderie Method and apparatus for making novelty yarn
US3445994A (en) * 1966-06-17 1969-05-27 Chavanoz Moulinage Retorderie Process for the manufacture of a looped yarn and apparatus therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1874502A (en) * 1928-09-19 1932-08-30 Green Allan Apparatus for encircling threads
US2131893A (en) * 1935-10-26 1938-10-04 Charles C Jessen Process and apparatus for twisting threads
FR895678A (fr) * 1943-06-23 1945-01-31 Dispositif et métier pour l'enveloppement d'un fil en vue de la fabrication d'un fil bouclé non retordu
US3439484A (en) * 1964-11-18 1969-04-22 Chavanoz Moulinage Retorderie Method and apparatus for making novelty yarn
US3445994A (en) * 1966-06-17 1969-05-27 Chavanoz Moulinage Retorderie Process for the manufacture of a looped yarn and apparatus therefor
US3382655A (en) * 1967-08-01 1968-05-14 Wasserman Allan Apparatus and method for making metallic frieze yarns

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683607A (en) * 1969-06-26 1972-08-15 Chavanoz Moulinage Retorderie Novel guide element for use in producing novelty yarns
US3868812A (en) * 1970-12-18 1975-03-04 Chavanoz Moulinage Retorderie Process and apparatus for the manufacture of effect yarn
US3717959A (en) * 1971-02-10 1973-02-27 Chavanoz Moulinage Retorderie Process for producing fancy effect yarns
US3913308A (en) * 1971-08-31 1975-10-21 Saint Andre Filature Method and apparatus for the manufacture of fancy yarns
US3928957A (en) * 1973-08-27 1975-12-30 Dso Textil Bg1973082724402 Method of and device for shaped effect yarns with or without ladders
US3889456A (en) * 1974-05-30 1975-06-17 Barden Corp Yarn covering spindle
US4010601A (en) * 1975-06-24 1977-03-08 Toyo Boseki Kabushiki Kaisha Method for manufacturing a fancy textured yarn provided with slubs
DE2849034A1 (de) * 1977-11-14 1979-09-27 Afa Corp Einheitsventil
US20100132537A1 (en) * 2008-12-03 2010-06-03 Generon Igs, Inc. Automatic lacer for bundles of polymeric fiber
US8171710B2 (en) * 2008-12-03 2012-05-08 Generon Igs, Inc. Automatic lacer for bundles of polymeric fiber
CN105970368A (zh) * 2016-07-29 2016-09-28 江苏宇顺纺织有限公司 花式纱张力区分罗拉系统
CN106319715A (zh) * 2016-10-09 2017-01-11 江南大学 一种逐层紧密包缠纱及其生产方法

Also Published As

Publication number Publication date
FR95049E (fr) 1970-03-27
ES356191A1 (es) 1970-04-01
GB1198948A (en) 1970-07-15
DE1760927A1 (de) 1972-02-10
BE715837A (enrdf_load_stackoverflow) 1968-10-16

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