US3848403A - Aerodynamic spinning of composite yarn - Google Patents

Aerodynamic spinning of composite yarn Download PDF

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Publication number
US3848403A
US3848403A US00385720A US38572073A US3848403A US 3848403 A US3848403 A US 3848403A US 00385720 A US00385720 A US 00385720A US 38572073 A US38572073 A US 38572073A US 3848403 A US3848403 A US 3848403A
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fibers
roll
groove
yarn
substrate
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E Bobkowicz
A Bobkowicz
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • D01H4/02—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by a fluid, e.g. air vortex
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
    • 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

Definitions

  • ABSTRACT Watkins Attorney, Agent, or Firm-Stevens, Davis, Miller & Mosher [57] ABSTRACT It has been found that with the use of air vortex at the initial stages of yarn formation, one can impart a desired light twist to the yarn. This light twist can be used as a pre-twist which supplements regular yarn pinp nea 4p is1ewe e wi l iy re esi twi r tentlon.
  • This invention relates to a novel aerodynamic method and apparatus for spinning of composite yarn.
  • the invention provides a novel and very advantageous method of applying light twist to composite fiber strand at the very beginning of the yarn forming operation.
  • the light twist can also be used as a pre-twist and the strand so pre-twisted can then be subjectedto a regular spinning operation to achieve final yarn with increased twist retention.
  • the method of this invention essentially comprises introducing fibers, alone or together with a tacky substrate, into a defined chamber and forming an air vortex in said chambenDue to this air vortex, the fibers become helically rearranged and twisted and are then consolidated in such helically twisted condition with a tacky substrate to form spun composite yarn which can be linearly wound-up on a collecting roll.
  • the fibers and the substrate may be further twisted by conventional twisting or by means of a false twist spindle prior to their consolidation into yarn. This produces a composite spun yarn with increased twist retention.
  • the consolidation of the helically'twisted fibers with the tacky substrate is effected in accordance with a preferred embodiment of this invention within a groove of a rotatable circumferentially grooved roll into which the fibers combined with the tacky substrate are introduced upon emergence from the air vortex chamber and in which they are condensed and consolidated to form spun yarn. Additional fibers of the same or different type can be introduced directly into the groove of the roll during consolidation; these additional fibers will be combined with the other components and will form a modified yarn with desired characteristics.
  • the groove of the circumferentially grooved roll is preferably provided with slots at its bottom and air suction means are then mounted within the grooved roll to impart suction through these slots and thereby produce a strong holding and wrapping action of the yarn against the bottom of the groove during consolidation.
  • the grooved consolidating roll can be rotated at very high speeds since, according to this invention, output speeds of above 1000 feet per minute are achievable.
  • speed in excess of about 300 feet per minute the fiber-polymer stream supplied into the groove of the consolidating roll will be exposed to strong centrifugal and air friction forces. These forces amplify as the speed of the roll increases and even when the roll is provided with suction means therewithin, the control and consolidation of the fibers with the polymer within the groove, which is generally V-shaped, is rendered very difficult.
  • the upper layer of the fiber mass not adequately engaged by the suction from within the consolidating roll, may slip or shift during high speed operation thereby resulting in the formation of unevenness in the yarn. This is particularly proticularly at output speeds exceeding 300 feet per minute.
  • One design of the grooved roll which will achieve this objective comprises forming a circumferential channel over and above each side of the V-grooved surface of the roll, which channel is provided 'at the top with holes or slots leading to the outside of the roll where a suc tion device is mounted.
  • the fibers When the fibers are introduced into such channeled groove and air suction is applied through said slots, the fibers will be projected into said channel, aided by the centrifugal forces of the roll axially revolving at high speed.
  • the fibers will remain within said channel on the sides of the'V-grooved roll until the suction is withdrawn and eventually replaced by blowing air from an air blowing device positioned at a predetermined point of the rolls path of travel.
  • the channels on each side of the grooved surface of the roll can be of any desired shape or configuration, although they will usually be U or V shaped.
  • the fibers may be supplied into the groove and subsequently into the channels from one or two separate sources, thus resulting in the accumula tion in each channel of the same or different fiber materials or blends thereof.
  • This fiber supply is preferably effected by means of a double position fiber lickerin roller having protruding sharp teeth or needles and eventually interposed projecting blades on its peripheral surface.
  • Such likerin rollers shred a fleece or a fiber web into desired fibers and the fiber feed from these rollers is transferred by suction or the like into the vortex chambers or directly into the groove of the to yarn by an air vortex means, the embodiment.
  • the air vortex may be applied both to the fiber and the tacky substrate simultaneously or it can be applied only tothe fibers which will thereby achieve the desired helical configuration. These fibers will then be transferred onto the grooved roll from the air vortex chamber and will be combined and consolidated therein with a tacky substrate which will be supplied at the same time into said groove.
  • the air vortex forces are applied in a specially provided vortex chamber positioned just above the groove of the consolidating roll.
  • a specially provided vortex chamber positioned just above the groove of the consolidating roll.
  • such chamber is of generally tubular or conical shape. Two such chambers may be used side by side to supply fibers from different sources as already mentioned above.
  • a twist imparting device such as a false twist spindle, through which the resulting yarn will pass.
  • This twisting device will impart additional twist to the yarn, which will be transferred by the yarn itself to the point of consolidation within the groove of the roll.
  • the twist will be substantially retained in the yarn due to interfiber and intermolecular slippage occuring during twisting, aided by the restraining braking forces produced by air suction and the centrifugal forces of the axially rotating roll, and enhanced by the cohesion forces of the vortex feed-in material in already pretwisted condition.
  • a good spun yarn with increased twist retention is obtained in this way.
  • the tacky substrate which is used with the fibers in accordance with the present invention, and which may be introduced either into the air vortex chamber or directly into the groove of the consolidating roll may be in any desired condition.
  • it may be in the form of extruded tacky polymer strands or filaments or in the form of a mist or spray of tacky particles or something of this sort.
  • Polymers such as polyethylene, polypropylene, polyamid, polyester, PVC and the like are eminently suitable for this purpose.
  • suitable forms of therrnosetting resins can be also utilized such as acrylic latices, phenolics, urea compounds, alkyds, epoxies and the like.
  • the staple fibers may also be any desired natural or man-made fibers, including glass fibers, metallic fibers, asbestos fibers, fibrids and the like.
  • the apparatus basically comprises: at least one air vortex chamber; means for introducing staple fibers into said vortex chamber; means for imparting vortex forces to said staple fibers within said chamber; a consolidating roll with at least one circumferential groove below said chamber; means for transfering the fiber supply from the air vortex chamber into the groove of said consolidating roll; means for simultaneously introducing a tacky substrate into thegroove of the roll; and means for consolidating said fibers with said tacky substrate within the groove of said roll to produce spun yarn which can subsequently be linearly wound on a collecting roll.
  • the tacky substrate can be introduced either directly into the groove of the consolidating roll or through the air vortex chamber, in which case it is first introduced into the air vortex chamber and then into the groove of the roll together with the fibers. In this latter situation the fibers will already be helically arranged around the tacky substrate within the vortex chamber, and will then be transferred together with said tacky substrate into the groove of the consolidating roll.
  • the groove of the consolidating roll is preferably V-shaped and is provided with holds or slots at the bottom thereof while suction means are provided within the roll to hold by suction the fibers and the substrate against the bottom of the groove during consolidation thereof into yarn.
  • channels may be provided over and above the sides of the groove with holes or slots at the top and suction means are provided outside of the roll to hold the fibers against the sides of the groove within said channels, then the suction is withdrawn and preferably blowing air is applied to move the fibers towards the center of the groove and combine and consolidate them with the tacky substrate in the said center of the groove.
  • This second embodiment is particularly preferred at high output speeds in excess of 300 feet per minute.
  • a twist imparting device such as a false twist spindle, may be provided following the consolidating roll, through which the obtained yarn is passed.
  • the twist generated by this device is transferred back into the groove and is applied to the yarn being formed as a positive additional twist.
  • the pre-twist obtained by air vortex means minimizes and offsets the counter twist created by the positive twisting torque of the false twist spindle at the initial point of consolidating engagement of the fibers with the polymer substrate within the groove of the consolidating roll, and enables to produce a spun yarn with substantially increased twist retention.
  • FIG. 1 is a partly sectional side elevation view of one embodiment in accordance with this invention showing an air vortex pre-twist chamber in the initial stage of composite yarn producing operation;
  • FIG. 2 is a partly sectional plan view of another embodiment of this invention showing two air-vortex pretwist chambers for fiber pre-twisting;
  • FIG. 3 is a partly sectional side view of still another embodiment of the arrangement in accordance with this invention.
  • an air vortex chamber 10 which is of a generally tubular shape, is provided within a metal block 11 and air vortex is produced within said chamber by sources of compressed air 12 and 13.
  • Fibers are fed into the air vortex chamber 10 from a lickerin roller 14 mounted within the same block 11 and having outwardly projecting needles 15 on its surface.
  • the fibers are forwarded from a fiber web 16, through supply roller 17, onto the surface of lickerin roller 14 where they are attenuated by the projecting needles 15.
  • These fibers are then blown out into the air vortex chamber by means of an air blowing device 18 mounted within roller 14.
  • Preferably two such fiber feeding arrangements are provided within the block 11, one on each side of air vortex chamber 10.
  • a tacky polymer substrate is introduced simultaneously with the fibers into air vortex chamber 10 from an extrusion nozzle 19.
  • the substrate is extruded in the form of a tacky polymer filament into the air vortex chamber 10 where the fibers wrap around such tacky filament assuming a helical configuration and forming a slight twist or pre-twist in the composite strand 20 issuing from said air vortex chamber 10.
  • a ready made filament 21 or yarn 22 can be introduced through the middle of the extrusion nozzle 19 or in any other desirable manner into the air vortex chamber where it may serve as a carrier.
  • the polymer substrate and the fibers will be held and carried by such carrier and the latter will constitute the core of the ultimately formed yarn.
  • such carrier is fed through the extrusion nozzle in such a way that when it leaves the same, it becomes coated with a film of tacky substrate supplied from the extruder.
  • the fibers are then wrapped around this tacky strand in helically rearranged manner in the air vortex chamber 10.
  • additional air is blown from above by air blowing devices 23 and 24.
  • the strand 20 which has acquired a light twist is forwarded to and through the groove of a rotatable grooved consolidating roll 25.
  • This groove 26 provided circumferentially on the roll 25 is generally V-shaped and at the bottom thereof there may be holes or slots 27 leading inside the roll 25 where an air suction device (not shown) may be mounted.
  • This strand 20 is consolidated within such groove 26 of rotating roll 25 and the air suction from inside, when provided, helps to produce a stronger hold against the bottom of the groove during consolidation. This is particularly important if one desires to incorporate additional fibers at this consolidation stage, when the substrate is still somewhat tacky. Such additional fibers can be fed by another lickerin roller 28 having needles 29 projecting on its surface.
  • the fibers are formed by supplying a fibrous web 30, through supply roller 31, onto the surface of such lickerin roller 28, where the web is shred into staple fibers, which are then transferred onto the surface of the roll 25 and within its circumferential groove by suction from within said roll 25.
  • the obtained yarn with a liqht twist can simply be forwarded through a tension roller 32 to the winding arrangement 33 where it is wound on a collecting roll 34.
  • the yarn can also pass through oscillating rolls 35, 36 to further condense the same into a round strand which is then wound on the collecting roll 34.
  • this yarn is to apply to it a strong twist by a twist imparting device 37.
  • This twist is transmitted through the yarn itself and is retained in the yarn at the point of consolidation within the groove 26 of the roll 25, due to interfiber and intermolecular slippage at this point. This enables to form a yarn with increased twist retention which is then simply and linearly wound on the collecting roll 34.
  • FIG. 2 instead of having one air vortex chamber, there are provided two air vortex chambers 40a and 40b, positioned side by side within block 39.
  • the air vortex within these chambers is imparted from a source of compressed air 41 and the fibers are supplied from two lickerin rollers 42a and 42b also positioned side by side and provided with needles 43 projecting upwardly on their surface and eventually with blades 44 mounted in staggered arrangement between the needles. This enables a good shredimparted with a twist therein.
  • the so twisted or pretwisted fibers are then fed within the V-shaped groove 46 of a rotating consolidating roll 45.
  • these fibers are blown towards the middle of the groove 46 by air blowing devices 51, 52 while a tacky substrate is also introduced into the middle of the groove at 53.
  • The'whole is combined and consolidated by imparting a twist from below to form spun yarn 54 with increased twist retention,
  • an air+vortex chamber 40 is provided and air vortex is produced therein by a source of compressed air 41.
  • Fibers are introduced into said air vortex chamber 40 from lickerin roller 42 provided with needles 43 and blades 44 onits surface.
  • This lockerin roller 42 is driven by a driving mechanism 55 i in the direction shown by the arrow in the middle of said roller 42.
  • the fibers are produced'by this licker-in roller by shredding a fleece or fiber web 56 is fed by supply roller 57 driven by driving mechanism 58 in the direction shown by the arrow in the middle of said roller.
  • a carrier strand 60 is unwound from bobbin 59 and forwarded through extruder 61 and into the air vortex chamber 40, aided by anair flow through tube 62.
  • a tacky polymer substrate is introduced into extruder 61 through inlet 63 and extruded into the air vortex chamber 40 so as to coat the carrier 60 with a layer of tacky substrate.
  • the fibers are helically wrapped around such tacky carrier to provide a desired pre-twist. Then, upon its exit from the air vortex chamber, the combined material is consolidated within the V-shaped groove 46 of the rotating consolidation roll 45 driven by driving mechanism 64.
  • Air is blown into the groove of said roll 45 through inlet 65 to help in the consolidation of the yarn and a protective plate 66 is provided at this point to prevent any fly-away of the fibers.
  • the yarn exiting from the consolidation roll 45 is further twisted by a false twist spindle 67 and then forwarded through a tension roller 68 towards a winding station.
  • Method for producing spun yarn which comprises forming an air vortex in a defined chamber, introducing into said chamber staple fibers and permitting said fibers to become helically twisted by said air vortex,'consolidating said helically twisted fibers with a tacky substrate to form spun yarn, and linearly winding up said yarn on a collecting roll.
  • Method according to claim 1 comprising forwarding simultaneously and helically twisted fibers from the air vortex chamber and said tacky substrate into and through a groove of a rotatable circumferentially grooved roll and imparting to said fibers and said substrate a strong holding and wrapping action against said groove whereby said fibers and said substrate are condensed and consolidated to form spun yarn.
  • Method according to claim 5 comprising providing the bottom of said groove of the circumferentially grooved roll with slots and imparting suction to said slots from within the roll, thereby producing the strong holding and wrapping action of said fibers and said substrate against the bottom of the groove required during formation of said spun yarn.
  • Method according to claim 5, comprising forming said groove of the circumferentially grooved roll as a general V-shaped groove, providing said groove with circumferential channels over and above its side faces, forming slots at the upper end of said channels and imparting suction through said slots so as to produce a holding action for the fibers within said circumferential channels on the side faces of the V-shaped groove and, when the fibers have thus accumulated within said channels removing said suction to allow said fibers to project from the channels towards the middle of the V- shaped groove of the roll and be condensed and consolidated there with the tacky substrate to form spun yarn.
  • Method according to claim 5, comprising further twisting said yarn being formed within said groove to produce spun yarn with increased twist.
  • Apparatus for producing spun yarn which comprises at least one air vortex chamber, means for introducing staple fibers into said vortex chamber, means for imparting vortex forces to said staple fibers within said chamber, a consolidating roll with at least one circumferential groove below said chamber, means for transferring the fibers from the air vortex chamber into the groove to said consolidating roll, means for simultaneously introducing a tacky substrate into the grooves of the roll and means for consolidating said fibers with said substrate within the groove of said roll to produce spun yam which can subsequently be linearly wound on a collecting roll.
  • Apparatus according to claim 10 further comprising a twist imparting device following said consolidating roll and means to pass the yarn coming out of the consolidating roll through said twist imparting device to impart to said yarn additional twist.
  • Apparatus according to claim 10 wherein the groove of the circumferentially grooved roll is provided with slots at the bottom and air suction means are mounted within said grooved roll to impart suction through said slots and thereby produce a strong holding and wrapping action of the yarn against the bottom of the groove.
  • the groove of the circumferentially grooved roll is generally V-shaped and is provided with circumferential channels over and above its side faces, said channels having slots at the top,'and air suction means are provided outside of the roll to impart suction through said slots and thereby produce a holding action for the fibers within said circumferential channels on the side faces of the V-shaped groove, and means are provided to remove said air suction at a predetermined point and thereby allow the fibers accumulated within the channel to project towards the middle of the V-shaped groove of the roll and be condensed and consolidated there with the tacky substrate.
  • Apparatus according to claim 16 further comprising guide means in front of the grooved roll so that staple fibers being blown towards the middle of the groove cannot fly out due to rotational forces of the rolland air blowing.
  • Apparatus according to claim 10 further comprising an extruder-above said vortex chamber for extruding the tacky substrate directly into said chamber.
US00385720A 1972-11-29 1973-08-06 Aerodynamic spinning of composite yarn Expired - Lifetime US3848403A (en)

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CA157,798A CA942487A (en) 1972-11-29 1972-11-29 Aerodynamic spinning of composite yarn

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JP (1) JPS4981635A (es)
AR (1) AR200890A1 (es)
AT (1) AT332258B (es)
AU (1) AU6283473A (es)
BE (1) BE807763A (es)
BR (1) BR7309313D0 (es)
CA (1) CA942487A (es)
CH (3) CH586764B5 (es)
ES (1) ES419626A1 (es)
FR (1) FR2208013B1 (es)
GB (1) GB1427373A (es)
IT (1) IT999842B (es)
NL (1) NL7315146A (es)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987612A (en) * 1973-09-19 1976-10-26 Bobkowicz E Method and apparatus for manufacture of composite yarn products
US4142354A (en) * 1977-03-24 1979-03-06 Murata Kikai Kabushiki Kaisha Direct spinning apparatus
US4244174A (en) * 1977-11-03 1981-01-13 The Bobtex Corporation, Ltd. Poy yarn compositions
US4676062A (en) * 1984-01-21 1987-06-30 Brockmanns K J Method and device for the formation of spinning fibers
US6106913A (en) * 1997-10-10 2000-08-22 Quantum Group, Inc Fibrous structures containing nanofibrils and other textile fibers
US20050109373A1 (en) * 1999-06-01 2005-05-26 Brown Brian J. Roller that avoids substrate slippage
CN102691143A (zh) * 2012-05-30 2012-09-26 武汉纺织大学 一种改善涡流纺纱成纱性能的方法
CN103215701A (zh) * 2013-04-18 2013-07-24 武汉纺织大学 一种改善涡流复合纺纱成纱结构的方法
CN104233550A (zh) * 2014-08-21 2014-12-24 绍兴文理学院 一种稀土光致变色的闪色喷气涡流纱加工方法
CN108642636A (zh) * 2018-05-03 2018-10-12 东华大学 批量化可控结构纳米纤维包覆纱的制备装置及其使用方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS210725B1 (en) * 1979-02-14 1982-01-29 Stanislav Srajtr Yarn manufacturing process and apparatus for making thereof
ZA823333B (es) * 1981-04-24 1983-11-14
WO1983003434A1 (en) * 1982-03-31 1983-10-13 Barnes, Alan Flame resistant yarns and fabrics, and furnishings incorporating such fabrics
JPS62500955A (ja) * 1984-10-29 1987-04-16 コモンウエルス　サイエンテイフイツク　アンド　インダストリアル　リサ−チ　オ−ガニゼ−シヨン 熱気体中の酸素分圧の測定のための検知器および方法

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US2972221A (en) * 1956-07-31 1961-02-21 Rex Asbestwerke Method of converting individual fibers into coherent fibrous bodies
US3382662A (en) * 1965-07-15 1968-05-14 Wyomissing Corp Covered elastomeric yarns
US3494118A (en) * 1967-11-20 1970-02-10 Bobkowicz E Universal open-end spinning method of multicomponent yarns production
US3548462A (en) * 1964-02-15 1970-12-22 Pavena Ag Process for the preparation of a fiber arrangement or strand composed of staple fibers for undergoing a subsequent high draft
US3659410A (en) * 1970-03-09 1972-05-02 Vyzk Ustav Banlnarsky Spinning machine and method

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US3439491A (en) * 1965-08-09 1969-04-22 Monsanto Co Process for making core spun yarns

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972221A (en) * 1956-07-31 1961-02-21 Rex Asbestwerke Method of converting individual fibers into coherent fibrous bodies
US3548462A (en) * 1964-02-15 1970-12-22 Pavena Ag Process for the preparation of a fiber arrangement or strand composed of staple fibers for undergoing a subsequent high draft
US3382662A (en) * 1965-07-15 1968-05-14 Wyomissing Corp Covered elastomeric yarns
US3494118A (en) * 1967-11-20 1970-02-10 Bobkowicz E Universal open-end spinning method of multicomponent yarns production
US3659410A (en) * 1970-03-09 1972-05-02 Vyzk Ustav Banlnarsky Spinning machine and method

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987612A (en) * 1973-09-19 1976-10-26 Bobkowicz E Method and apparatus for manufacture of composite yarn products
US4142354A (en) * 1977-03-24 1979-03-06 Murata Kikai Kabushiki Kaisha Direct spinning apparatus
US4244174A (en) * 1977-11-03 1981-01-13 The Bobtex Corporation, Ltd. Poy yarn compositions
US4676062A (en) * 1984-01-21 1987-06-30 Brockmanns K J Method and device for the formation of spinning fibers
US6106913A (en) * 1997-10-10 2000-08-22 Quantum Group, Inc Fibrous structures containing nanofibrils and other textile fibers
US6308509B1 (en) * 1997-10-10 2001-10-30 Quantum Group, Inc Fibrous structures containing nanofibrils and other textile fibers
US20060189465A1 (en) * 1999-06-01 2006-08-24 Applied Materials, Inc. Roller that avoids substrate slippage
US6918864B1 (en) * 1999-06-01 2005-07-19 Applied Materials, Inc. Roller that avoids substrate slippage
US20050109373A1 (en) * 1999-06-01 2005-05-26 Brown Brian J. Roller that avoids substrate slippage
CN102691143A (zh) * 2012-05-30 2012-09-26 武汉纺织大学 一种改善涡流纺纱成纱性能的方法
CN102691143B (zh) * 2012-05-30 2014-12-10 武汉纺织大学 一种改善涡流纺纱成纱性能的方法
CN103215701A (zh) * 2013-04-18 2013-07-24 武汉纺织大学 一种改善涡流复合纺纱成纱结构的方法
CN103215701B (zh) * 2013-04-18 2015-07-22 武汉纺织大学 一种改善涡流复合纺纱成纱结构的方法
CN104233550A (zh) * 2014-08-21 2014-12-24 绍兴文理学院 一种稀土光致变色的闪色喷气涡流纱加工方法
CN108642636A (zh) * 2018-05-03 2018-10-12 东华大学 批量化可控结构纳米纤维包覆纱的制备装置及其使用方法
CN108642636B (zh) * 2018-05-03 2021-08-20 东华大学 批量化可控结构纳米纤维包覆纱的制备装置及其使用方法

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ES419626A1 (es) 1976-03-01
CH1474373A4 (es) 1976-10-29
GB1427373A (en) 1976-03-10
CH578062A5 (es) 1976-07-30
JPS4981635A (es) 1974-08-06
BE807763A (fr) 1974-03-15
DE2359590B2 (de) 1977-04-28
BR7309313D0 (pt) 1974-09-05
AT332258B (de) 1976-09-27
IT999842B (it) 1976-03-10
ATA969173A (de) 1975-12-15
AR200890A1 (es) 1974-12-27
DE2359590A1 (de) 1974-07-11
CA942487A (en) 1974-02-26
NL7315146A (es) 1974-05-31
CH586764B5 (es) 1977-04-15
AU6283473A (en) 1975-05-29
FR2208013B1 (es) 1976-05-14
FR2208013A1 (es) 1974-06-21

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