CN109402802A - False twist textured yarn production equipment and method based on double eddy-current techniques - Google Patents
False twist textured yarn production equipment and method based on double eddy-current techniques Download PDFInfo
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- CN109402802A CN109402802A CN201811578866.5A CN201811578866A CN109402802A CN 109402802 A CN109402802 A CN 109402802A CN 201811578866 A CN201811578866 A CN 201811578866A CN 109402802 A CN109402802 A CN 109402802A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000009987 spinning Methods 0.000 claims abstract description 38
- 238000004804 winding Methods 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 15
- 238000004513 sizing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 4
- 238000009960 carding Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000009998 heat setting Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 description 8
- 238000007382 vortex spinning Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000007378 ring spinning Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 1
- 229920004933 Terylene® Polymers 0.000 description 1
- 210000001520 comb Anatomy 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- 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
- D01H13/00—Other common constructional features, details or accessories
- D01H13/28—Heating or cooling arrangements for yarns
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
The invention discloses a kind of false twist textured yarn production equipments and method based on double eddy-current techniques, the production equipment includes drafting system, device for turbo-spinning below drafting system, false-twisting device and winding mechanism below device for turbo-spinning, the device for turbo-spinning includes the first minor air cell and several first jets in the first minor air cell, first jet is entered the wind by several first tangent air inlets, the false-twisting device includes second eddy current room and several second nozzles in second eddy current room, second nozzle is entered the wind by several second tangent air inlets, first minor air cell and second eddy current room are connected with gas chamber respectively, the first swirl shape air-flow and the second swirl shape air-flow are respectively formed in first minor air cell and second eddy current room.The present invention significantly reduces production process, can effectively reduce equipment investment cost, improves production efficiency, reduces production cost, realizes energy-saving and emission-reduction.
Description
Technical field
The present invention relates to technical field of spinning equipment, raw more particularly to a kind of false twist textured yarn based on double eddy-current techniques
Produce device and method.
Background technique
The method of production false twist textured yarn traditional at present is still divided into two parts, first the spun yarn on spinning machine, then
False twist texturing processing is carried out on false twisting machine.This method needs respectively using spinning machine and false twisting machine, and production wire length, equipment are thrown
Money, cost of labor are relatively high, and production efficiency is lower.
Need to research and develop spinning false twisting all-in-one machine thus, it is public in the patent of Chinese invention patent publication number CN104278369A
A kind of single ingot disc type RING SPINNING false-twisting device and process are opened comprising a rotation is installed on ring spinning frame
Disc type false-twisting device and a spacer rod form the spinning section that two twisting points export front roller using a rotating circular disk
False twisting is carried out, spacer rod is mounted between two false twisting points, is played two false twisting points of separation and is increased spinning section and selector disc
Between pressure effect.Foregoing invention patent is the spinning false twisting integrated equipment based on ring spinning, well known ring spinning
Speed is very slow, and only tens meters of speed per minute, production efficiency are still very low.
Therefore, in view of the above technical problems, it is necessary to provide it is a kind of based on double eddy-current techniques false twist textured yarn production set
Standby and method.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of false twist textured yarn production equipment based on double eddy-current techniques and
Method, to realize the One-step production of false twist textured yarn.
To achieve the goals above, the technical solution that one embodiment of the invention provides is as follows:
A kind of false twist textured yarn production equipment based on double eddy-current techniques, the production equipment include drafting system, are located at
Device for turbo-spinning below drafting system, the false-twisting device below device for turbo-spinning and winding mechanism, the vortex
Spinning apparatus includes the first minor air cell and several first jets in the first minor air cell, and first jet is cut by several first
It is entered the wind to air inlet, the false-twisting device includes second eddy current room and several second nozzles in second eddy current room,
Second nozzle is entered the wind by several second tangent air inlets, first minor air cell and second eddy current room respectively with gas chamber phase
It is connected to, is respectively formed the first swirl shape air-flow and the second swirl shape air-flow in the first minor air cell and second eddy current room.
As a further improvement of the present invention, first tangent air inlet is rotated in a first direction distribution, the first vortex
The first swirl shape air-flow that indoor formation is rotated in a first direction, the second tangent air inlet rotate in a second direction distribution, and second
The the second swirl shape air-flow rotated in a second direction is formed in minor air cell, first direction and second direction are opposite.
As a further improvement of the present invention, between the gas chamber and the first minor air cell be equipped with the first solenoid valve, gas chamber with
Second solenoid valve is equipped between second eddy current room, the swirl shape air-flow of the first minor air cell and second eddy current room passes through the first electricity respectively
Magnet valve and second solenoid valve are controlled.
As a further improvement of the present invention, the device for turbo-spinning further includes being set to the first indoor sley point of vortex
And hollow spindle.
As a further improvement of the present invention, the false-twisting device further includes positioned at the hot plate of second eddy current room front end and cold
But plate and the sizing heater box positioned at second eddy current room rear end.
As a further improvement of the present invention, the drafting system includes several rollers.
As a further improvement of the present invention, the winding mechanism includes self-tightening type delivery roller and winding device, winding
The winding speed of device is 250m/min~450m/min.
Another embodiment of the present invention provides technical solution it is as follows:
A kind of false twist textured yarn production method based on double eddy-current techniques, the production method include:
S1, rove is obtained after successively carrying out opening or cleaning, cotton carding and drafting to fiber；
S2, by rove feeding drafting system carry out drawing-off after, into device for turbo-spinning；
S3, device for turbo-spinning export yarn after being spinned by the first indoor first swirl shape air-flow of vortex；
S4, yarn enter second eddy current room after hot plate heats and coldplate is cooling, pass through second eddy current indoor second
Swirl shape air-flow carries out yarn untwisting, and the yarn after untwisting carries out thermal finalization through sizing heater box, obtains false twist textured yarn,
In, the first swirl shape air-flow is opposite with the direction of rotation of the second swirl shape air-flow；
S5, false twist textured yarn is wrapped by winding mechanism.
As a further improvement of the present invention, in the step S3, the pressure of the first swirl shape air-flow is 0.3~
0.6Mpa。
As a further improvement of the present invention, in the step S4, the heating temperature of hot plate is 190~220 DEG C, coldplate
Cooling temperature be 20~35 DEG C, the pressure of the second swirl shape air-flow is 0.3~0.6Mpa, the heat setting temperature for heater box of being formed
It is 180~220 DEG C.
The beneficial effects of the present invention are:
The present invention realizes the function of carrying out air vortex spinning, yarn false-twisted deformation on the same device, compares traditional
The spinning of false twist textured yarn, false twisting twice, the equipment significantly reduce production process, can effectively reduce equipment investment at
This, improves production efficiency, reduces production cost, realizes energy-saving and emission-reduction；
The spinning speed of false twist textured yarn is very fast, most can achieve 450m/min fastly, and quality is reliable and stable, difference batch
A quality difference of taking second place is small.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in invention, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of false twist textured yarn production equipment in a specific embodiment of the invention；
Fig. 2 is the air inlet schematic diagram of the first minor air cell in a specific embodiment of the invention；
Fig. 3 is the air inlet schematic diagram of second eddy current room in a specific embodiment of the invention.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
The term of the representation spaces relative position such as such as " left side " used herein, " left side ", " right side ", " right side " is for just
A unit as shown in the drawings or feature are described relative to another unit or the relationship of feature in the purpose of explanation.It is empty
Between the term of relative position can be intended to include different direction of the equipment in use or work other than orientation as shown in the figure.
For example, the unit for being described as being located at other units or feature " left side " will be located at other if the equipment in figure overturn
Unit or feature " right side ".Therefore, exemplary term " left side " can include both orientation of left and right side.Equipment can be with
Other modes are directed (be rotated by 90 ° or other directions), and are interpreted accordingly used herein with space correlation description language.
Join shown in Fig. 1, the invention discloses a kind of false twist textured yarn production equipments based on double eddy-current techniques, including drawing-off
Device, the device for turbo-spinning below drafting system, false-twisting device and winding mechanism below device for turbo-spinning,
Each structure is described in detail below.
Drafting system is located at the top of equipment, and the rove fed from yarn guide enters drafting system, drawing-off through horn mouth
Device includes four rollers, respectively the 4th roller 14, third roller 13, middle roller 12 and front roller 11.
The rove that drafting obtains feeds the 4th roller 14, third roller 13, middle roller 12 and front roller 11 by horn mouth
Four drawing-offs effect after, into device for turbo-spinning 20.
As shown in connection with fig. 2, device for turbo-spinning 20 include the first minor air cell and in the first minor air cell several first
Nozzle, device for turbo-spinning 20 further include during hollow spindle is tapered set on the indoor sley point of the first vortex and hollow spindle
Sky setting.In the present embodiment, the main function of sley point is to ensure that sliver is entered in the first minor air cell with non-twist state, and prevents
The only upward downstream of the twist in downstream；Hollow spindle is the hollow shape of a taper, and boring channel is the yarn twisted
Line transfer passage, the tail end lodging of fiber hollow spindle conical surface upper end and carry out under the drive of air-swirl revolution plus
It twists.
Wherein, first jet is entered the wind by several first tangent air inlets 21, and the first minor air cell is connected with gas chamber,
The first swirl shape air-flow 201 is formed in first minor air cell.Between gas chamber 50 and the first minor air cell be equipped with the first solenoid valve 51, first
The swirl shape air-flow of minor air cell is controlled by the first solenoid valve 51, can control the switch and size of air-flow.
First minor air cell's nozzle is there are four the first tangent air inlet 21 for being distributed clockwise in the present embodiment, and air-flow is from first
Tangent air inlet enters the first minor air cell, forms clockwise first swirl shape air-flow.By the effect of air-flow, free end is driven
Fiber looping twists to form yarn.
Fiber enters device for turbo-spinning 20, the first vortex along spiral helicine fiber channel under the drive of axial flow
4 clockwise first tangent air inlets form high-speed rotating swirl shape air-flow clockwise in room, drive lodging in hollow ingot
Fiber on the sub- conical surface is turned round with air-swirl, and encirclement is wrapped on subsequent fiber, and along the yarn inside hollow spindle
Line passage output.
As shown in connection with fig. 3, false-twisting device includes second eddy current room 31 and several second nozzles in second eddy current room,
Second nozzle is entered the wind by several second tangent air inlets 311, and second eddy current room 31 is connected with gas chamber 50, second eddy current
Indoor the second swirl shape of formation air-flow 301.Second solenoid valve 52, second eddy current room are equipped between gas chamber 50 and second eddy current room 31
Swirl shape air-flow controlled by second solenoid valve, can control the switch and size of air-flow.
Second eddy current room nozzle is there are four the second tangent air inlet 311 for being distributed counterclockwise in the present embodiment, and air-flow is from the
Two tangent air inlets enter second eddy current room 31, form the second swirl shape air-flow 301 counterclockwise.It is right by the effect of air-flow
Vortex spinning yarn made of twisting carries out untwisting, to ultimately form false twist textured yarn.
Further, false-twisting device further include positioned at second eddy current room front end hot plate 32 and coldplate 33 and be located at
The sizing heater box 34 of second eddy current room rear end.
The yarn come out from spinning room first passes through hot plate 32 and heats, hot plate 32 directly and yarn contacts, heating and temperature control
At 190~220 DEG C, it is therefore an objective to so that its structure is formed, eliminate internal stress caused by twisting, reach equilibrium state, anti-retaining
It twists and occurs.
Then yarn passes through coldplate 33, and coldplate 33 is directly controlled with yarn contacts, temperature at 20~35 DEG C, makes yarn
Temperature drops to glass transition temperature hereinafter, to make Yarn twisting form fix.
Subsequent yarn is again introduced into second eddy current room 31, and spray nozzle device is equipped with the second tangential air inlet in second eddy current room 31
Mouthful, nozzle airintake direction in the direction and the first minor air cell of air inlet is on the contrary, stream pressure is 0.3~0.6Mpa, to reach
Untwisting purpose.
Yarn after untwisting is heated through heater box 34 of being formed using hot-air mode, and temperature is controlled at 180~220 DEG C, is moved back
The internal stress relaxation generated when deformation is eliminated in twist yarn thermal finalization under hot air acting, reduces percent thermal shrinkage, is obtained elastic preferable
False twist textured yarn.
Winding mechanism includes self-tightening type delivery roller 41 and winding device 42, for the package of false twist textured yarn, winding dress
The winding speed set is 250m/min~450m/min.
False twist textured yarn reaches self-tightening type delivery roller 41 through electronic yarn clearer, yarn tension sensor, finally by volume
The cylinder yarn that winding apparatus 42 is wound into.
The invention also discloses a kind of false twist textured yarn production methods based on double eddy-current techniques comprising opening or cleaning process,
Carding step, mixing in doubling step, air vortex spinning process, rolling step.
Staple fiber passes through opening or cleaning process, and effectively shredding, mixing, removal of impurities are carried out on opening picking machinery；Subsequently enter comb
Cotton process effectively combs the good fiber of shredding, improves the extended parallelization of fiber as far as possible；Then using drafting work
Sequence reduces the weight unevenness of rove so that fiber is further uniformly mixed, and the suitable of subsequent Technology of Air Vortex Spinning can be effectively ensured
Benefit carries out；After rove feeding false twist textured yarn production equipment after drafting, spinning becomes required yarn, then by winding
Device is wound into cylinder yarn.
Specifically, the present invention in the false twist textured yarn production method based on double eddy-current techniques the following steps are included:
S1, rove is obtained after successively carrying out opening or cleaning, cotton carding and drafting to fiber.
S2, by rove feeding drafting system carry out drawing-off after, into device for turbo-spinning；
S3, device for turbo-spinning export yarn after being spinned by the first indoor first swirl shape air-flow of vortex.
Preferably, the pressure of the first swirl shape air-flow is 0.3~0.6Mpa.
S4, yarn enter second eddy current room after hot plate heats and coldplate is cooling, pass through second eddy current indoor second
Swirl shape air-flow carries out yarn untwisting, and the yarn after untwisting carries out thermal finalization through sizing heater box, obtains false twist textured yarn,
In, the first swirl shape air-flow is opposite with the direction of rotation of the second swirl shape air-flow；
Preferably, the heating temperature of hot plate is 190~220 DEG C, and the cooling temperature of coldplate is 20~35 DEG C, the second vortex
The pressure of shape air-flow is 0.3~0.6Mpa, and the heat setting temperature for heater box of being formed is 180~220 DEG C.
S5, false twist textured yarn is wrapped by winding mechanism.
Preferably, the winding speed of winding mechanism is 250m/min~450m/min.
In a specific embodiment of the invention, the first break draft ratio of drafting system is 3.0, and middle draw ratio is 2.8, dominant draft
Than being 30, the first indoor pressure of vortex is 0.5Mpa, and hot plate temperature is 200 DEG C, and cooling plate temperature is 30 DEG C, second eddy current room
Interior pressure is 0.5Mpa, and sizing heater box temperature is 200 DEG C, spinning speed 430m/min, and roll angle is 15 °.
Production equipment and method provided by the invention can be realized continuous high-speed production vortex spinning false twist textured yarn, can be with
In the velocity interval that spinning speed is 250m/min~450m/min, a kind of One-step production based on double eddy-current techniques is provided
Different size, different shape, different performance vortex spinning false twist textured yarn, different fiber species (terylene, viscose glue can also be directed to
Fiber etc.) it is pure spinning or blended false twist textured yarn.
As can be seen from the above technical solutions, the invention has the following beneficial effects:
The present invention realizes the function of carrying out air vortex spinning, yarn false-twisted deformation on the same device, compares traditional
The spinning of false twist textured yarn, false twisting twice, the equipment significantly reduce production process, can effectively reduce equipment investment at
This, improves production efficiency, reduces production cost, realizes energy-saving and emission-reduction；
The spinning speed of false twist textured yarn is very fast, most can achieve 450m/min fastly, and quality is reliable and stable, difference batch
A quality difference of taking second place is small.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (10)
1. a kind of false twist textured yarn production equipment based on double eddy-current techniques, which is characterized in that the production equipment includes drawing-off
Device, the device for turbo-spinning below drafting system, false-twisting device and winding mechanism below device for turbo-spinning,
The device for turbo-spinning includes the first minor air cell and several first jets in the first minor air cell, if first jet passes through
Dry first tangent air inlet is entered the wind, the false-twisting device include second eddy current room and in second eddy current room several the
Two nozzles, second nozzle are entered the wind by several second tangent air inlets, first minor air cell and second eddy current room difference
It is connected with gas chamber, the first swirl shape air-flow and the second swirl shape air-flow is respectively formed in the first minor air cell and second eddy current room.
2. production equipment according to claim 1, which is characterized in that first tangent air inlet is rotated in a first direction
It is distributed, forms the first swirl shape air-flow being rotated in a first direction in the first minor air cell, the second tangent air inlet is in a second direction
Rotation is distributed, and the second swirl shape air-flow rotated in a second direction, first direction and second direction phase are formed in second eddy current room
Instead.
3. production equipment according to claim 2, which is characterized in that be equipped with first between the gas chamber and the first minor air cell
Solenoid valve is equipped with second solenoid valve, the swirl shape air-flow of the first minor air cell and second eddy current room between gas chamber and second eddy current room
It is controlled respectively by the first solenoid valve and second solenoid valve.
4. production equipment according to claim 1, which is characterized in that the device for turbo-spinning further includes being set to the first whirlpool
Flow indoor sley point and hollow spindle.
5. production equipment according to claim 1, which is characterized in that the false-twisting device further includes being located at second eddy current room
The hot plate and coldplate of front end and sizing heater box positioned at second eddy current room rear end.
6. production equipment according to claim 1, which is characterized in that the drafting system includes several rollers.
7. production equipment according to claim 1, which is characterized in that the winding mechanism include self-tightening type delivery roller and
Winding device, the winding speed of winding device are 250m/min~450m/min.
8. a kind of false twist textured yarn production method based on double eddy-current techniques, which is characterized in that the production method includes:
S1, rove is obtained after successively carrying out opening or cleaning, cotton carding and drafting to fiber；
S2, by rove feeding drafting system carry out drawing-off after, into device for turbo-spinning；
S3, device for turbo-spinning export yarn after being spinned by the first indoor first swirl shape air-flow of vortex；
S4, yarn enter second eddy current room after hot plate heats and coldplate is cooling, pass through indoor second vortex of second eddy current
Shape air-flow carries out yarn untwisting, and the yarn after untwisting carries out thermal finalization through sizing heater box, obtains false twist textured yarn, wherein the
One swirl shape air-flow is opposite with the direction of rotation of the second swirl shape air-flow；
S5, false twist textured yarn is wrapped by winding mechanism.
9. production method according to claim 8, which is characterized in that in the step S3, the pressure of the first swirl shape air-flow
Power is 0.3~0.6Mpa.
10. production method according to claim 8, which is characterized in that in the step S4, the heating temperature of hot plate is
190~220 DEG C, the cooling temperature of coldplate is 20~35 DEG C, and the pressure of the second swirl shape air-flow is 0.3~0.6Mpa, sizing
The heat setting temperature of heater box is 180~220 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811578866.5A CN109402802A (en) | 2018-12-21 | 2018-12-21 | False twist textured yarn production equipment and method based on double eddy-current techniques |
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| CN201811578866.5A CN109402802A (en) | 2018-12-21 | 2018-12-21 | False twist textured yarn production equipment and method based on double eddy-current techniques |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110004549A (en) * | 2019-05-09 | 2019-07-12 | 江苏恒宇纺织集团有限公司 | A kind of compound traction fiber of high-shrinkage polyester cotton and preparation method thereof |
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