CN216639739U - Production equipment for rice-shaped polyester-nylon composite filaments - Google Patents
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- CN216639739U CN216639739U CN202122473192.6U CN202122473192U CN216639739U CN 216639739 U CN216639739 U CN 216639739U CN 202122473192 U CN202122473192 U CN 202122473192U CN 216639739 U CN216639739 U CN 216639739U
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Abstract
The utility model provides production equipment of a Mi-shaped polyester-nylon composite yarn, and relates to the technical field of fiber production. The production equipment of the rice-shaped polyester-nylon composite yarn comprises a bottom plate; the composite polyester-nylon yarn has higher anti-fouling capability and super-softness, the rapid absorption of fibers is increased by adding a moisture absorption medium, and meanwhile, because jade powder and graphene oxide powder are added, the composite polyester-nylon yarn can generate a temperature difference of 2-3 ℃ when being contacted with skin, so the composite polyester-nylon yarn has the advantages of moisture absorption, quick drying, coolness and comfort, the prepared fabric is soft, comfortable, dry and pleasant, the temperature of the inner side of the upper cabinet can be kept to the maximum extent through a feeding heat insulation structure, the phenomenon that the temperature is too fast lost when feeding is molten is avoided, the heating energy consumption of a heating zone of a screw extruder is reduced, and all melts are mixed more uniformly.
Description
Technical Field
The utility model relates to the technical field of fiber production, in particular to production equipment of a polyester-nylon composite yarn shaped like a Chinese character 'mi'.
Background
With the progress of society and the improvement of people's living standard, new healthy and environment-friendly chemical fiber products are more and more popular, the traditional chemical fiber products have low added value and can not adapt to the current situation, the polyester fabric is chemical fiber clothes widely applied to daily life, and the main advantage of the polyester fabric is that the crease resistance and the deformation resistance are good, so the polyester fabric is suitable for outdoor articles such as coats and clothes, various bags and tents, the elasticity of the polyester is close to that of wool, the crease resistance is higher than that of other fibers, the polyester fabric has good deformation resistance, the polyester has lower water absorption rate, moisture regain and good insulating property, but because the water absorption rate is low, the electrostatic current generated by friction is large, the subsequent dyeing property is poor, the nylon has good strength and wear resistance, excellent durability, good moth resistance and corrosion resistance, and the fabric has good elasticity and elastic recovery, however, the polyester-nylon composite fiber product is easy to deform under the action of external force, so that the fabric is easy to crease in the wearing process, and the polyester-nylon composite fiber product is on the market, has soft hand feeling, comfortable wearing and high strength, but is limited by the self material characteristics of polyester and nylon, the elastic recovery rate of the composite fiber is also influenced to a certain extent, and the high-elasticity composite fiber cannot be manufactured, so that certain limitation is brought to the application of the polyester-nylon composite fiber product, the defects of poor hygroscopicity, poor contact cooling performance and the like exist, and the polyester-nylon composite fiber product cannot be used for producing summer wear and sports wear.
The utility model aims to solve the defects of the prior art and provide the Mi-shaped polyester-nylon composite filament which has the functions of hygroscopicity and good contact cooling performance and has the characteristics of composite fiber.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
Aiming at the defects of the prior art, the utility model provides production equipment of a rice-shaped polyester-nylon composite yarn, which solves the problems that the prior art has the defects of poor hygroscopicity, poor contact cooling property and the like, and cannot be used for producing summer clothing and sportswear.
(II) technical scheme
In order to achieve the purpose, the utility model is realized by the following technical scheme: a production device of a Chinese character 'mi' shaped polyester-nylon composite yarn comprises a bottom plate; the lower wall of the upper cabinet is fixedly connected with the upper wall of the bottom cabinet at a position close to the rear wall; the feeding heat-insulation structure is arranged on the inner side wall of the upper cabinet and used for insulating the upper cabinet; two groups of screw extruders, static mixers and metering pumps which are fixedly connected with the lower wall of the inner side of the upper cabinet from back to front and used for feeding are sequentially arranged; the composite spinning box is fixedly connected to the lower wall of the upper cabinet and positioned on the front side of the bottom cabinet, and a distribution assembly for distributing melt and a box body heat insulation structure for insulating the composite spinning box are arranged in the composite spinning box; the spinneret plate is fixedly connected to the lower wall of the composite spinning box and used for spraying the melt into melt trickle, and a plurality of groups of first spinneret holes and second spinneret holes are formed in the inner wall of the spinneret plate; the side blowing device is fixedly connected to the front wall of the bottom cabinet and is used for cooling and solidifying the melt trickle; the oiling device and the network device are arranged on the front wall of the bottom cabinet from top to bottom and positioned on the lower side of the side blowing device; the first yarn guide disc and the second yarn guide disc are rotatably connected to the front wall of the bottom cabinet and positioned on the lower side of the network device, and the first yarn guide disc is positioned on the right side of the second yarn guide disc; the winder is fixedly connected to the front wall of the bottom cabinet and close to the bottom plate.
Preferably, feeding insulation construction includes first cabinet body heat preservation, second cabinet body heat preservation, cabinet internal container and multiunit support bar, first cabinet body heat preservation, second cabinet body heat preservation, cabinet internal container set gradually at last cabinet inside wall from outside to inside, multiunit support bar fixed connection is between first cabinet body heat preservation and second cabinet body heat preservation, first cabinet body heat preservation, second cabinet body heat preservation pass through multiunit support bar interval formation cavity.
Preferably, box insulation construction includes box heat preservation, box inner bag, heat preservation baffle, box heat preservation fixed connection is at compound spinning incasement lateral wall, box inner bag fixed connection is at the box heat preservation inside wall, heat preservation baffle fixed connection is between box inner bag antetheca and back wall, the box inner bag is inside separates into main cavity body and the vice cavity that controls the setting through the heat preservation baffle, compound spinning incasement wall is provided with respectively to main cavity body and the heat medium circulation heating device that vice cavity heating is heat retaining, and is two sets of the measuring pump exit end all link up with main cavity body and vice cavity respectively through the pipeline.
Preferably, the distribution assembly comprises a first distribution plate and a second distribution plate, the first distribution plate and the second distribution plate are sequentially and fixedly connected to the inner side wall of the composite spinning box from top to bottom and are located on the lower side of the box body heat insulation structure, and the inner walls of the first distribution plate and the second distribution plate are provided with melt distribution cavities.
Preferably, the cross sections of the plurality of groups of first spinneret orifices are in a shape of Chinese character mi.
Preferably, the cross-sectional shapes of the multiple groups of second spinneret orifices are all fan-shaped, and the multiple groups of second spinneret orifices are circumferentially distributed by taking the center of the first spinneret orifice as the circle center and are respectively positioned between eight included angles in the shape of a Chinese character 'mi' of the first spinneret orifice.
The utility model also provides a production method of the Mi-shaped polyester-nylon composite filament, which comprises the following steps:
s1, drying and melting the functional PA6 slices and the PET slices according to a certain proportion through two groups of screw extruders to form melts, mixing the melts through two groups of static mixers, accurately metering the melts through two groups of metering pumps, and feeding the melts into a composite spinning box, wherein the two groups of screw extruders are divided into a first zone with the temperature of 250 +/-2 ℃, a second zone with the temperature of 255 +/-2 ℃, a third zone with the temperature of 259 +/-2 ℃, a fourth zone with the temperature of 261 +/-2 ℃, a fifth zone with the temperature of 263 +/-2 ℃ and a sixth zone with the temperature of 265 +/-2 ℃;
s2, enabling the two groups of melts to respectively enter a main cavity and an auxiliary cavity in a composite spinning box, heating and insulating the melts by a heat medium circulating heating device, respectively distributing the melts to a first spinneret orifice and a second spinneret orifice on a spinneret plate through melt distribution channels on a first distribution plate and a second distribution plate, and spraying a composite melt trickle filled with a functional PA6 as an intermediate skeleton and PET as an included angle through the spinneret plate, wherein the main cavity is kept at 286 +/-2 ℃ and the auxiliary cavity is kept at 266 +/-2 ℃;
s3, blowing, cooling and solidifying the composite melt trickle by a side blowing device to form nascent fibers, wherein the relative humidity of cooling air blown out by the side blowing device is 85%, the air speed is 0.85-1 m/S, the air pressure is 20-40 Pa and the air temperature is 16-20 ℃;
s4, oiling the cooled nascent fiber through an oiling device, winding the cooled nascent fiber into a POY spinning cake through a winding machine after passing through a first godet and a second godet through a netlike device network, wherein the oiling device uses an oiling agent of bamboo F-2583, the oiling concentration is 15%, the rotating speed of the oiling device is 5-7 rpm, the speed of the first godet is 3100m/min, the speed of the second godet is 3120m/min, the network pressure of the netlike device is 0.10MPa, and the winding speed of the winding machine is 3100 m/min.
Preferably, the preparation method of the functional PA6 slice is as follows:
1) drying and melting MgSO4 powder, CaCl2 powder, jade powder and graphene oxide powder, injecting the mixture into a dynamic mixer, and fully fusing the mixture with a PA6 melt, wherein the mass ratio of the jade powder to the graphene oxide powder is 1-3: 0.15-0.5, and the graphene oxide powder is graphene prepared by a redox method;
2) and extruding the fused melt by an extruder, and carrying out water cooling, granulating and drying to prepare functional PA6 slices.
Preferably, the proportion of the functional PA6 slices to the PET slices is 60-90: 10-40.
Preferably, the functional PA6 slice index is relative viscosity 2.78 +/-0.01 and melting point 220+2 ℃.
(III) advantageous effects
The utility model provides production equipment of a rice-shaped polyester-nylon composite yarn. The method has the following beneficial effects:
1. the product of the utility model is used as one of polyester-nylon composite yarns, has higher anti-fouling capability and super-softness, and can improve the physical properties of synthetic fibers, such as high elasticity, high strength, wear resistance and corrosion resistance.
2. The moisture absorption medium is added to increase the rapid absorption of the fibers, the cross sections of the fibers are in a shape of rice, the effects of rapid absorption, diffusion and moisture volatilization of the fibers are increased, meanwhile, the jade powder and the graphene oxide powder are added, so that the fabric can generate a temperature difference of 2-3 ℃ when being contacted with the skin, and the fabric has the advantages of moisture absorption, quick drying, coolness and comfort, is soft, comfortable, dry and pleasant, and can be widely applied to summer wear and sports leisure wear.
3. Can keep the inboard temperature of upper cabinet by the at utmost through feeding insulation construction, the temperature runs off at the excessive speed when avoiding the feeding melting, reduces the heating energy consumption of the screw extruder zone of heating, and each fuse-element mixes more evenly.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a sectional view of the top view of the upper cabinet of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is a sectional view showing the internal structure of the composite manifold;
FIG. 5 is a top view of a spinneret plate structure;
fig. 6 is a partially enlarged view of fig. 5 at B.
Wherein, 1, a bottom plate; 2. a bottom cabinet; 3. loading the cabinet; 4. a first cabinet body heat-insulating layer; 5. a hollow layer; 6. a supporting strip; 7. a second cabinet body heat insulation layer; 8. an inner container of the cabinet body; 9. a screw extruder; 10. a static mixer; 11. a metering pump; 12. a composite spinning box; 13. a box body heat insulation layer; 14. an inner container of the box body; 15. a heat-insulating partition plate; 16. a main chamber; 17. a secondary cavity; 18. a first distribution plate; 19. a second distribution plate; 20. a spinneret plate; 21. a first spinneret orifice; 22. a second spinneret orifice; 23. a side blowing device; 24. an oiling device; 25. a network device; 26. a first godet; 27. a second godet; 28. and (4) a winding machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 6, an embodiment of the present invention provides a production apparatus for a mi-shaped polyester-nylon composite yarn, including a bottom plate 1; the lower wall of the upper cabinet 3 and the position close to the rear wall are fixedly connected with the upper wall of the bottom cabinet 2; the feeding heat-insulation structure is arranged on the inner side wall of the upper cabinet 3 and used for insulating the upper cabinet 3; two groups of screw extruders 9, static mixers 10 and metering pumps 11 which are fixedly connected with the lower wall of the inner side of the upper cabinet 3 for feeding are sequentially arranged from back to front, and two groups of melts forming the composite filament are respectively melted, stirred, metered and conveyed through the two groups of screw extruders 9, the static mixers 10 and the metering pumps 11; the composite spinning box 12 is fixedly connected with the lower wall of the upper cabinet 3 and positioned on the front side of the bottom cabinet 2, and a distribution assembly for distributing melt and a box body heat insulation structure for insulating the composite spinning box 12 are arranged in the composite spinning box 12; a spinneret plate 20 fixedly connected to the lower wall of the composite spinning box 12 and used for spraying the melt into melt trickle, wherein the inner wall of the spinneret plate 20 is provided with a plurality of groups of first spinneret holes 21 and second spinneret holes 22, the cross sections of the plurality of groups of first spinneret holes 21 are in a shape of Chinese character 'mi', the cross sections of the plurality of groups of second spinneret holes 22 are in a shape of sector, and the plurality of groups of second spinneret holes 22 are circumferentially distributed by taking the center of the first spinneret hole 21 as the center of a circle and are respectively positioned between eight included angles in the shape of Chinese character 'mi' of the first spinneret hole 21; the side blowing device 23 is fixedly connected to the front wall of the bottom cabinet 2 and used for cooling and solidifying the melt trickle, and the side blowing device 23 supplies cooling air through a cooling air blowing system; the oiling device 24 and the network device 25 are arranged on the front wall of the bottom cabinet 2 from top to bottom and positioned on the lower side of the side blowing device 23; a first godet 26 and a second godet 27 which are rotatably connected to the front wall of the bottom cabinet 2 and are positioned at the lower side of the network device 25, wherein the first godet 26 comprises GR1 and SR1, the second godet 27 comprises GR2 and SR2, and the first godet 26 is positioned at the right side of the second godet 27; a winder 28 fixedly connected to the front wall of the base cabinet 2 and adjacent to the base plate 1.
Feeding insulation construction includes first cabinet body heat preservation 4, second cabinet body heat preservation 7, internal container 8 of cabinet and multiunit support bar 6, first cabinet body heat preservation 4, second cabinet body heat preservation 7, internal container 8 of cabinet sets gradually at last 3 inside walls of cabinet from outside to inside, 6 fixed connection of multiunit support bar are between first cabinet body heat preservation 4 and second cabinet body heat preservation 7, first cabinet body heat preservation 4, second cabinet body heat preservation 7 forms well hollow 5 through 6 intervals of multiunit support bar, through first cabinet body heat preservation 4, second cabinet body heat preservation 7 and middle well hollow 5, can furthest keep the inside temperature of 3 upper cabinets, avoid the temperature to run off too fast and the screw extruder 9 that causes continuously heats, the production energy consumption has been reduced.
The box insulation construction includes box heat preservation 13, box inner bag 14, thermal baffle 15, 13 fixed connection of box heat preservation is at 12 inside walls of composite spinning case, 14 fixed connection of box inner bag is at 13 inside walls of box heat preservation, 15 fixed connection of thermal baffle is between 14 antethecas of box inner bag and back wall, 14 inside main cavity 16 and the vice cavity 17 of setting about separating into through thermal baffle 15, 12 outer walls of composite spinning case are provided with respectively to main cavity 16 and vice cavity 17 heat retaining heat medium circulation heating device, 11 exit ends of two sets of measuring pumps all link up with main cavity 16 and vice cavity 17 respectively through the pipeline, heat main cavity 16 and vice cavity 17 separate heating through heat medium circulation heating device, cooperation box insulation construction, make two sets of fuse-elements can keep being fit for separately spinning in the temperature range.
The distribution assembly comprises a first distribution plate 18 and a second distribution plate 19, the first distribution plate 18 and the second distribution plate 19 are sequentially and fixedly connected to the inner side wall of the composite spinning box 12 from top to bottom and are located on the lower side of the box body heat insulation structure, the inner walls of the first distribution plate 18 and the second distribution plate 19 are respectively provided with a melt distribution cavity channel, and two groups of melts are distributed to a first spinneret orifice 21 and a second spinneret orifice 22 through the first distribution plate 18 and the second distribution plate 19.
The utility model also provides a production method of the Mi-shaped polyester-nylon composite filament, which comprises the following steps:
s1, drying and melting the functional PA6 slices and the PET slices according to a certain proportion by two groups of screw extruders 9 to form melts, mixing the melts by two groups of static mixers 10, accurately metering the melts by two groups of metering pumps 11, and feeding the melts into a composite spinning box 12, wherein the two groups of screw extruders 9 are divided into a first zone at the temperature of 250 +/-2 ℃, a second zone at the temperature of 255 +/-2 ℃, a third zone at the temperature of 259 +/-2 ℃, a fourth zone at the temperature of 261 +/-2 ℃, a fifth zone at the temperature of 263 +/-2 ℃ and a sixth zone at the temperature of 265 +/-2 ℃;
s2, enabling the two groups of melts to respectively enter a main cavity 16 and an auxiliary cavity 17 in a composite spinning box 12, heating and insulating the melts by a heat medium circulating heating device, respectively distributing the melts to a first spinneret orifice 21 and a second spinneret orifice 22 on a spinneret plate 20 through melt distribution cavity channels on a first distribution plate 18 and a second distribution plate 19, and spraying a composite melt trickle filled by taking functional PA6 as an intermediate skeleton and PET as an included angle through the spinneret plate 20, wherein the temperature of the main cavity 16 is kept at 286 +/-2 ℃, and the temperature of the auxiliary cavity 17 is kept at 266 +/-2 ℃;
s3, blowing, cooling and solidifying the composite melt by a lateral blowing device 23 to form nascent fibers, wherein the relative humidity of cooling air blown out by the lateral blowing device 23 is 85%, the air speed is 0.85-1 m/S, the air pressure is 20-40 Pa and the air temperature is 16-20 ℃;
s4, oiling the cooled nascent fiber through an oiling device 24, winding the cooled nascent fiber into a POY spinning cake through a winding machine 28 after passing through a first godet 26 and a second godet 27 through a netlike device 25 network, wherein the oiling device 24 uses bamboo F-2583 as oiling agent, the oiling concentration is 15%, the rotating speed of the oiling device 24 is 5-7 rpm, the speed of the first godet 26 is 3100m/min, the speed of the second godet 27 is 3120m/min, the network pressure of the netlike device 25 is 0.10MPa, and the winding speed of the winding machine 28 is 3100 m/min.
The functional PA6 slice is prepared as follows:
1, drying and melting MgSO4 powder, CaCl2 powder, jade powder and graphene oxide powder, injecting the mixture into a dynamic mixer, and fully fusing the mixture with a PA6 melt, wherein the mass ratio of the jade powder to the graphene oxide powder is 1-3: 0.15-0.5, and the graphene oxide powder is graphene prepared by a redox method;
2 extruding the fused melt by an extruder, granulating after water cooling, drying and preparing into functional PA6 slices.
The proportion of the functional PA6 slices to the PET slices is 60-90: 10-40.
The indexes of the functional PA6 slices are relative viscosity of 2.78 +/-0.01 and melting point of 220+2 ℃.
According to the utility model, the prepared product is tested, and the test results are shown in the following table 1:
TABLE 1
The data show that the Mi-shaped polyester-nylon composite fiber obtained by the utility model has good performance in various performance indexes, and the comprehensive performance indexes of the obtained product meet the technical standards of the industry.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a production facility of rice style of calligraphy polyester-polyamide composite filament which characterized in that: comprises a bottom plate (1);
the bottom cabinet (2) and the upper cabinet (3) are fixedly connected to the upper surface of the bottom plate (1), and the lower wall of the upper cabinet (3) and the position close to the rear wall are fixedly connected with the upper wall of the bottom cabinet (2);
the feeding heat-insulation structure is arranged on the inner side wall of the upper cabinet (3) and is used for insulating the upper cabinet (3);
two groups of screw extruders (9), a static mixer (10) and a metering pump (11) which are fixedly connected with the lower wall of the inner side of the upper cabinet (3) from back to front in sequence and used for feeding;
the composite spinning box (12) is fixedly connected to the lower wall of the upper cabinet (3) and located on the front side of the bottom cabinet (2), and a distribution assembly for distributing melt and a box body heat insulation structure for insulating the composite spinning box (12) are arranged inside the composite spinning box (12);
the spinneret plate (20) is fixedly connected to the lower wall of the composite spinning box (12) and used for spraying melt into melt trickle, and a plurality of groups of first spinneret holes (21) and second spinneret holes (22) are formed in the inner wall of the spinneret plate (20);
a side blowing device (23) fixedly connected to the front wall of the bottom cabinet (2) and used for cooling and solidifying the melt trickle;
the oiling device (24) and the network device (25) are arranged on the front wall of the bottom cabinet (2) from top to bottom and positioned on the lower side of the side blowing device (23);
the first yarn guide disc (26) and the second yarn guide disc (27) are rotatably connected to the front wall of the bottom cabinet (2) and located on the lower side of the network device (25), and the first yarn guide disc (26) is located on the right side of the second yarn guide disc (27);
a winding machine (28) fixedly connected to the front wall of the bottom cabinet (2) and close to the bottom plate (1).
2. The production equipment of rice-shaped polyester-nylon composite wires according to claim 1, which is characterized in that: feeding insulation construction includes first cabinet body heat preservation (4), second cabinet body heat preservation (7), internal container of cabinet (8) and multiunit support bar (6), first cabinet body heat preservation (4), second cabinet body heat preservation (7), internal container of cabinet (8) are from outer and interior to set gradually at last cabinet (3) inside wall, multiunit support bar (6) fixed connection is between first cabinet body heat preservation (4) and second cabinet body heat preservation (7), first cabinet body heat preservation (4), second cabinet body heat preservation (7) form cavity layer (5) through multiunit support bar (6) interval.
3. The production equipment of rice-shaped polyester-nylon composite wires according to claim 1, which is characterized in that: box insulation construction includes box heat preservation layer (13), box inner bag (14), heat preservation baffle (15), box heat preservation layer (13) fixed connection is at composite spinning case (12) inside wall, box inner bag (14) fixed connection is at box heat preservation layer (13) inside wall, heat preservation baffle (15) fixed connection is between box inner bag (14) antetheca and back wall, box inner bag (14) inside separates main cavity body (16) and vice cavity (17) that the left and right sides set up through heat preservation baffle (15), composite spinning case (12) outer wall is provided with respectively to main cavity body (16) and vice cavity (17) heat retaining heat medium circulation heating device, and is two sets of metering pump (11) exit end all link up with main cavity body (16) and vice cavity (17) respectively through the pipeline.
4. The production equipment of rice-shaped polyester-nylon composite wires according to claim 1, which is characterized in that: the distribution assembly comprises a first distribution plate (18) and a second distribution plate (19), the first distribution plate (18) and the second distribution plate (19) are sequentially and fixedly connected to the inner side wall of the composite spinning box (12) from top to bottom and are located on the lower side of the box body heat insulation structure, and the inner walls of the first distribution plate (18) and the second distribution plate (19) are provided with melt distribution cavities.
5. The production equipment of rice style of calligraphy of claim 1 is washed bright compound silk of silk, its characterized in that: the cross sections of the first spinneret orifices (21) are in a shape of Chinese character 'mi'.
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| CN202122473192.6U CN216639739U (en) | 2021-10-14 | 2021-10-14 | Production equipment for rice-shaped polyester-nylon composite filaments |
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| CN202122473192.6U CN216639739U (en) | 2021-10-14 | 2021-10-14 | Production equipment for rice-shaped polyester-nylon composite filaments |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114150390A (en) * | 2021-10-14 | 2022-03-08 | 江苏嘉通能源有限公司 | Production equipment and production method of polyester-nylon composite yarn shaped like Chinese character' mi |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114150390A (en) * | 2021-10-14 | 2022-03-08 | 江苏嘉通能源有限公司 | Production equipment and production method of polyester-nylon composite yarn shaped like Chinese character' mi |
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