CN115522267A

CN115522267A - Composite fiber with high velvet feeling and elasticity and preparation method and application thereof

Info

Publication number: CN115522267A
Application number: CN202211240595.9A
Authority: CN
Inventors: 朱军营; 侍野; 杨利军
Original assignee: JIANGSU ZHONGLU TECHNOLOGY DEVELOPMENT CO LTD
Current assignee: JIANGSU ZHONGLU TECHNOLOGY DEVELOPMENT CO LTD
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2022-12-27

Abstract

The invention discloses a composite fiber with high velvet feeling and elasticity, a preparation method and application thereof, wherein the method comprises the following steps: the method has the advantages that the method can be used for preparing the multi-component composite fiber, the production speed can reach 2500-5500m/min, the running cost of an elasticizer or a flat-draw machine is saved, and the ton cost is greatly reduced; and the produced composite fiber has a special structure after boiling water hot setting before weaving, so that the composite fiber has the characteristics of high fluffy feeling, high elasticity, good drapability and rebound resilience, good hand feeling and luster and the like.

Description

Composite fiber with high velvet feeling and elasticity and preparation method and application thereof

Technical Field

The invention relates to the technical field of chemical fibers, in particular to a composite fiber with high velvet feeling and elasticity, and a preparation method and application thereof.

Background

Polyethylene terephthalate (PET) is prepared by exchanging dimethyl terephthalate with ethylene glycol or esterifying terephthalic acid with ethylene glycol to synthesize dihydroxy ethyl terephthalate, and then performing polycondensation reaction. The high-temperature-resistant and high-frequency-resistant composite material has excellent physical and mechanical properties in a wider temperature range, the long-term use temperature can reach 120 ℃, the electrical insulation property is excellent, even under high temperature and high frequency, the electrical property is still good, but the corona resistance is poor, and the creep resistance, the fatigue resistance, the friction resistance and the dimensional stability are good.

Polybutylene terephthalate (PBT), which is a polyester prepared by polycondensation of terephthalic acid and 1, 4-butanediol, is an important thermoplastic polyester, one of five engineering plastics. The polybutylene terephthalate is a milky translucent to opaque semi-crystalline thermoplastic polyester, has high heat resistance, is not resistant to strong acid and strong alkali, can resist organic solvents, is combustible, and can be decomposed at high temperature.

The PTT fiber is an English abbreviation of poly (trimethylene-terephthalate) -1, 3-propylene glycol terephthalate (English) fiber, integrates the characteristics of softness of nylon, bulkiness of acrylic fiber, stain resistance of terylene, inherent elasticity of the PTT fiber, normal-temperature dyeing and the like, integrates the excellent wearability of various fibers, and becomes one of the latest international hot polymer new materials.

In the traditional process, for example, to realize the combination of the three groups of raw material fibers to form the composite fiber, the three groups of raw material fibers are respectively spun to generate corresponding yarn coils, then the three groups of raw material fibers are twisted together in the unwinding process of the yarn coils, or the yarn coils of the parallel bi-component fibers and the yarn coils of the single-component fibers are firstly generated, and then the two groups of raw material fibers and the single-component fibers are combined and twisted in the unwinding process of the yarn coils, wherein the twisting mode is formed by stranding in a false twisting elasticizer or a flat drawing machine, however, the method has more processes, the elasticizer or the flat drawing machine is limited by speed, the highest production speed can only reach about 1000m/min, the yield is low, and the cost is high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an improved production method of composite fibers, which not only can greatly improve the production speed, but also can combine high velvet feeling and high elasticity.

In order to achieve the purpose, the invention adopts the technical scheme that:

a method of producing a composite fiber, the method comprising: respectively taking a polymer with a first intrinsic viscosity as a component A, a polymer with a second intrinsic viscosity as a component B, and a polymer with a third intrinsic viscosity as a component C, wherein the first intrinsic viscosity is greater than the second intrinsic viscosity;

spinning the component A, the component B and the component C through the same spinning component to enable the component A and the component B to spin side-by-side bicomponent fibers and the component C to spin single-component fibers;

then, the treatment is performed by means (i) or (ii):

mode (i): processing a bicomponent tow formed by the spun bicomponent fiber according to an FDY process, and in the FDY process, continuously processing the bicomponent tow processed by the first hot roller and a monocomponent tow formed by the spun monocomponent fiber according to the FDY process after the bicomponent tow and the monocomponent tow are plied;

mode (ii): and (3) treating the bicomponent tows formed by the spun bicomponent fibers according to an FDY process, and in the FDY process treatment process, continuously treating the bicomponent tows treated by the second hot roller and the monocomponent tows formed by the spun monocomponent fibers according to the FDY process after the bicomponent tows treated by the second hot roller and the monocomponent tows formed by the spun monocomponent fibers are folded.

According to some preferred aspects of the invention, the third intrinsic viscosity is greater than the second intrinsic viscosity and less than the first intrinsic viscosity.

According to some preferred aspects of the invention, the difference between the first intrinsic viscosity and the second intrinsic viscosity is 0.1 to 0.9dL/g, further 0.3 to 0.9dL/g.

According to some preferred aspects of the invention, the component a is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.75-1.2dL/g, polybutylene terephthalate with an intrinsic viscosity of 1.0-1.4dL/g, and poly (1, 3-propylene terephthalate) with an intrinsic viscosity of 1.0-1.4 dL/g.

According to some preferred aspects of the invention, the component B is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.40-0.66dL/g, polybutylene terephthalate with an intrinsic viscosity of 0.80-0.95dL/g, and poly (1, 3-propylene terephthalate) with an intrinsic viscosity of 0.80-0.95 dL/g.

According to some preferred aspects of the invention, the component C is selected from at least one of the following polymers: polyethylene terephthalate having an intrinsic viscosity of 0.50 to 0.70dL/g, polybutylene terephthalate having an intrinsic viscosity of 0.85 to 1.0dL/g, and poly (1, 3-propylene terephthalate) having an intrinsic viscosity of 0.85 to 1.0 dL/g.

According to some preferred aspects of the present invention, in the composite fiber, the component a accounts for 10% to 80%, the component B accounts for 10% to 80%, and the component C accounts for 10% to 80% by mass.

According to some preferred aspects of the invention, the spinning pack comprises a spinneret plate comprising a first spinneret plate for spinning side-by-side bicomponent fibers and a second spinneret plate for spinning monocomponent fibers, wherein the first spinneret plate and the second spinneret plate are integrally formed to form the spinneret plate.

Furthermore, the first spinning plate and the second spinning plate are respectively provided with at least one spinning plate and the number of the spinning plates is the same.

Further, the first spinneret plate has any one of the following two structures;

the first structure is as follows: the first spinneret plate comprises a first spinneret hole and a material receiving area groove for respectively introducing the component A melt and the component B melt, and the first spinneret hole is communicated with the material receiving area groove;

the second structure is as follows: the first spinneret plate comprises a component A receiving groove for guiding a component A melt, a component B receiving groove for guiding a component B melt, a component A spinneret orifice communicated with the component A receiving groove, and a component B spinneret orifice communicated with the component B receiving groove; the spinneret orifices of the component A and the spinneret orifices of the component B are respectively arranged in an inclined way, and the central lines of the spinneret orifices of the component A and the spinneret orifices of the component B form an acute included angle;

when the component A is compatible or partially compatible with the component B, the first spinneret plate adopts a second structure; when the component A is incompatible with the component B, the first spinneret plate adopts a first structure or a second structure.

According to some preferred aspects of the present invention, the second spinneret plate comprises a component C receiving groove for introducing a component C melt, and a second spinneret hole communicated with the component C receiving groove, wherein the center line of the second spinneret hole is perpendicular to the upper surface or the lower surface of the second spinneret plate.

According to some preferred and specific aspects of the present invention, before entering the spinning assembly, the component a, the component B, and the component C are each independently melt-extruded or melt-direct-spun by a screw extruder.

In some embodiments of the present invention, when the component a, the component B, and the component C are made of the polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and 1, 3-polytrimethylene terephthalate (PTT) as raw materials, the component a, the component B, and the component C are respectively melt-extruded by screw extruders, and are conveyed to respective metering pumps and spinning boxes through respective melt pipelines, and the screw temperature of each zone of the component a is controlled at 220-310 ℃,220-310 ℃,220-310 ℃,220-310 ℃,220-310 ℃,220-310 ℃; the temperature of screws in each zone of the component B is controlled at 220-290 ℃,220-290 ℃,220-290 ℃,220-290 ℃ and 220-290 ℃; the temperature of each area of the screw of the component C is controlled to be 220-295 ℃,220-295 ℃,220-295 ℃,220-295 ℃ and 220-295 ℃; the temperature of each box pipeline of the component A, the component B and the component C is controlled to be 220-305 ℃,220-288 ℃ and 220-292 ℃ respectively.

In some embodiments of the invention, the component A and the component B are respectively melt-extruded by a screw extruder, the component C is obtained by melt direct spinning, and the temperature of a pipeline and a box of the component C is controlled to be 220-292 ℃.

Further, when the component A, the component B and the component C adopt the polyethylene terephthalate (PET), the polybutylene terephthalate (PBT) and the poly-1, 3-propylene glycol terephthalate (PTT) as raw materials, the crystallization temperature of the component A, the component B and the component C is controlled to be 105-180 ℃, the drying temperature is controlled to be 100-180 ℃, and the required dry sliced sheets are prepared, so that the water content is ensured to be less than or equal to 40ppm.

According to some preferred aspects of the invention, embodiments of mode (i) comprise: cooling and oiling a plurality of spun bicomponent fibers to form bicomponent tows, and respectively carrying out pre-network treatment and first hot roller treatment on the bicomponent tows;

cooling and oiling the spun monocomponent fiber to form monocomponent tows;

and (3) plying the double-component tows and the single-component tows which are processed by the first hot roller, performing middle network processing, second hot roller processing and main network processing, and winding and forming.

According to some preferred aspects of the invention, embodiments of mode (ii) comprise: cooling and oiling a plurality of spun bicomponent fibers to form bicomponent tows, and respectively carrying out pre-network treatment, first hot roller treatment and second hot roller treatment on the bicomponent tows;

cooling and oiling the spun monocomponent fiber to form monocomponent tows;

and (3) plying the double-component tows and the single-component tows which are processed by the second hot roller, processing by adopting an intermediate network and a main network, and winding and forming.

According to some preferred aspects of the invention, in embodiments of mode (i) or mode (ii):

the cooling is carried out by adopting circular blowing, and the wind pressure is 10-50Pa;

the pressure of the pre-network treatment is 0.3-2.5bar, the pressure of the intermediate network treatment is 1.0-5.0bar, and the pressure of the main network treatment is 1.0-5.0bar;

the temperature of the first hot roller treatment is 45-90 ℃, the temperature of the second hot roller treatment is 95-160 ℃, and the drafting multiple is 1.1-3.5;

the winding forming speed is 2500-5500m/min.

In some embodiments of the invention, the oil shelf height of the oiling is controlled between 600 and 1200mm.

In some embodiments of the invention, the rotation speed of a finish oil pump for oiling is set according to the oil content, and the rotation speed of a metering pump for melting is set according to the linear density.

The invention provides another technical scheme that: a composite fiber produced by the production method.

The invention provides another technical scheme that: the application of the composite fiber in woven fabrics and knitted fabrics.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

based on the defects of low production efficiency, complicated working procedures and the like of the existing composite fiber, on the basis of a large number of experiments, the inventor accidentally finds that if the same spinning component is adopted to respectively spin the bicomponent fiber and the monocomponent fiber, then on the basis of the FDY process, the bicomponent tows formed by the spun bicomponent fiber are subjected to the treatment of a first hot roller or a second hot roller in the treatment process of the FDY process and then are stranded with the monocomponent tows formed by the spun monocomponent fiber and then are continuously treated according to the FDY process, the mode not only can be used for preparing the multicomponent composite fiber, but also can be used for realizing ultrahigh production speed which can reach 2500-5500m/min, the running cost of an elasticizer or a flat-drawn machine is saved, and the cost of ton yarn is greatly reduced; particularly, the single-component fibers are prevented from being stretched by the first hot roll, the produced composite fibers have special structures after being subjected to heat setting before weaving, particularly the double-component fibers are arranged inside the fabric, the single-component fibers are wound on the outer surfaces of the double-component fibers in a wavy mode, and the wavy arching density of the single-component fibers is high, so that the composite fibers have the characteristics of high velvet feeling, high elasticity, good drapability and rebound resilience, good hand feeling and luster and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.

FIG. 1 is a first schematic view of a production system used in a method for producing composite fibers according to an embodiment of the present invention; wherein, 1, spinning assembly; 2. a cooling mechanism; 3. an oiling mechanism; 4. a guide wire hook frame; 5. a scissor arrangement; 6. a pre-network processor; 7. a first devillicate row; 8. a second wire dividing row; 9. a first hot roll; 10. a third devillicate row; 11. a first dividing roll; 12. a fourth filament row; 13. a first cold roll; 14. an intermediate network processor; 15. a second heat roller; 16. a second dividing roller; 17. an iron plate wire separator; 18. a main network processor; 19. a winding machine; l1, bicomponent fibers; l2, monocomponent fibers; l3, composite fibers;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

FIG. 3 is a second schematic structural view of a production system used in the method for producing a composite fiber according to an embodiment of the present invention; wherein, 1', a spinning assembly; 2', a cooling mechanism; 3', an oiling mechanism; 4', a guide wire hook frame; 5', a scissor device; 6', a pre-network processor; 7', a first devillicating row; 8' and a second devillicate row; 9', a first thermo roll; 10', a first dividing roll; 11' and a third devillicate row; 12', a second thermo roll; 13' and a second yarn dividing roller; 14', a first cold roll; 15', a fourth wire dividing row; 16', an intermediate network processor; 17', a second cold roll; 18', an iron plate wire separator; 19', a master network processor; 20', a winder; l1', bicomponent fibers; l2', monocomponent fibers; l3', composite fibers;

FIG. 4 is an enlarged schematic view at B of FIG. 3;

FIG. 5 is a first schematic diagram of the construction of a spinneret plate in a spin pack assembly used in an embodiment of the present invention;

fig. 6 is a first schematic diagram of the internal structure of the spinneret plate shown in fig. 5;

fig. 7 is a second schematic view of the internal structure of the spinneret plate shown in fig. 5;

FIG. 8 is a second schematic diagram of the construction of a spinneret plate in a spin pack assembly used in an embodiment of the present invention;

fig. 9 is a first schematic diagram of the internal structure of the spinneret plate shown in fig. 8;

fig. 10 is a schematic view of the internal structure of the spinneret plate shown in fig. 8;

FIG. 11 is a schematic diagram of a third configuration of a spinneret plate in a spin pack assembly for use in an embodiment of the present invention;

fig. 12 is a first schematic view of the internal structure of the spinneret shown in fig. 11;

fig. 13 is a second schematic view of the internal structure of the spinneret shown in fig. 11;

FIG. 14 is a fourth schematic diagram of the construction of a spinneret plate in a spin pack assembly used in an embodiment of the present invention;

fig. 15 is a first schematic view of the internal structure of the spinneret plate shown in fig. 14;

fig. 16 is a second schematic view of the internal structure of the spinneret plate shown in fig. 14;

wherein, 100, spinneret plates; 110. a first spinneret plate; 111. a receiving area slot; 112. a first spinneret orifice; 113. the component A is connected with a material groove; 114. the component B is connected with a material tank; 115. a spinneret orifice of the component A; 116. a spinneret orifice of the component B; 120. a second spinneret plate; 121. a material receiving groove for the component C; 122. a second spinneret orifice;

fig. 17 is a schematic structural view of the composite fiber prepared in example 1 of the present invention after boiling water heat setting before weaving; 200 of single-component tows; 300. a bicomponent tow; 400. composite fibers;

FIG. 18 is a cross-sectional view of a composite fiber prepared in example 1 of the present invention;

FIG. 19 is a schematic structural view of the composite fiber prepared in comparative example 1 after boiling water heat setting before weaving; wherein, 400' is a composite fiber;

FIG. 20 is a comparison of the composite fibers of example 1 and comparative example 1 after boiling water heat-setting, respectively;

FIG. 21 is a comparison of the cloth cover states of the composite fibers of example 1 and comparative example 1 after being respectively woven into the cloth cover;

FIG. 22 is a cloth cover state diagram after the composite fiber of example 3 is woven into a cloth cover;

FIG. 23 is a graph showing the comparison of dyeing ability at 100 ℃ after the composite fibers of example 4 and comparative example 1 were respectively woven into a band.

Detailed Description

The main inventive concept of the invention is as follows: the method comprises the steps of respectively spinning bicomponent fibers and monocomponent fibers by using the same spinning component, then respectively carrying out different treatments on the bicomponent fibers and the monocomponent fibers, specifically, carrying out hot roller treatment on the bicomponent fibers for stretching and shaping, avoiding carrying out stretching treatment on the monocomponent fibers at a hot roller, and further enabling bicomponent tows formed by the spun bicomponent fibers to be subjected to first hot roller treatment or second hot roller treatment in the FDY process treatment process, then plying with monocomponent tows formed by the spun monocomponent fibers, and then continuously carrying out treatment according to the FDY process; the production mode is different from the general conventional FDY idea by virtue of an FDY process, namely, the process treatment modes such as hot roller treatment and the like for carrying out subsequent stretching and shaping on single and double components after being folded are abandoned, and the invention unexpectedly discovers that the treatment mode obtains the specific composite fiber which has a special structure after being subjected to heat shaping before weaving, specifically, double-component tows are arranged inside and single-component tows are wound on the outer surface of the double-component fiber in a wavy shape, and the wavy camber density of the single-component tows is higher (a specific structural schematic diagram can be seen in figure 17), so that the composite fiber has high downy feel and elasticity, good drapability and rebound resilience, good hand feeling and luster, and the method can also have excellent production efficiency, and the production speed can reach 2500-5500m/min.

Based on this, the invention provides a production method of composite fiber, which comprises the following steps: respectively taking a polymer with a first intrinsic viscosity as a component A, a polymer with a second intrinsic viscosity as a component B and a polymer with a third intrinsic viscosity as a component C, wherein the first intrinsic viscosity is greater than the second intrinsic viscosity;

spinning the component A, the component B and the component C through the same spinning assembly to enable the component A and the component B to spin side-by-side bicomponent fibers, and the component C to spin single-component fibers;

then, the treatment is performed by the method (i) or the method (ii):

mode (ii): and (3) processing the bicomponent tows formed by the spun bicomponent fibers according to an FDY process, and in the FDY process, continuously processing according to the FDY process after the bicomponent tows processed by the second hot roller and the monocomponent tows formed by the spun monocomponent fibers are folded.

In the present invention, mode (i): the single-component tows are subjected to setting temperature adjustment, the styles such as velvet feeling of the cloth surface and the like can be changed, one cold roller is omitted for the filament path, and the operation cost is lower than that of the second scheme; mode (ii): the single-component tows are not subjected to temperature setting, and under the same process conditions and in a comparison mode (i), the cloth cover velvet feeling is stronger, and the special high velvet feeling requirements are met.

Preferably, the third intrinsic viscosity is greater than the second intrinsic viscosity and less than the first intrinsic viscosity, the difference between the first intrinsic viscosity and the second intrinsic viscosity is 0.1 to 0.9dL/g, further 0.3 to 0.9dL/g, and component a is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.75-1.2dL/g, polybutylene terephthalate with an intrinsic viscosity of 1.0-1.4dL/g, and poly-1, 3-propylene terephthalate with an intrinsic viscosity of 1.0-1.4dL/g, wherein the component B is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.40-0.66dL/g, polybutylene terephthalate with an intrinsic viscosity of 0.80-0.95dL/g, and poly-1, 3-propylene terephthalate with an intrinsic viscosity of 0.80-0.95dL/g, wherein the component C is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.50-0.70dL/g, polybutylene terephthalate with an intrinsic viscosity of 0.85-1.0dL/g, and poly (1, 3-propylene terephthalate) with an intrinsic viscosity of 0.85-1.0 dL/g.

Preferably, in the composite fiber, the component A accounts for 10-80 percent, the component B accounts for 10-80 percent and the component C accounts for 10-80 percent by mass percentage.

In order to more clearly understand the process of the invention, the invention further provides a production system of the composite fiber, which comprises a spinning assembly, a cooling mechanism, an oiling mechanism, a pre-network processor, a first hot roller, an intermediate network processor, a second hot roller, a main network processor and a winder, and is shown in fig. 1 to 16; the spinning assembly comprises a spinneret plate, the spinneret plate comprises a first spinneret plate and a second spinneret plate, the first spinneret plate is used for spinning parallel bicomponent fibers, the second spinneret plate is used for spinning single-component fibers, and the first spinneret plate and the second spinneret plate are integrally formed to form the spinneret plate; the cooling mechanism comprises a double-component cooling area and a single-component cooling area, and the oiling mechanism comprises a double-component oiling area and a single-component oiling area;

the production system comprises a bicomponent processing zone, a monocomponent processing zone, a ply production zone, the bicomponent processing zone comprising a first spinneret plate, a bicomponent cooling zone, a bicomponent oiling zone, a pre-network processor, a first hot roll, and optionally a second hot roll;

the single-component processing area comprises a second spinneret plate, a single-component cooling area and a single-component oiling area;

the plying production area comprises an intermediate network processor, a main network processor, a winding machine and an optional second hot roller;

the second heated roll is included by either the bicomponent processing zone, the plying production zone; when the bicomponent processing zone includes a second hot roll, the second hot roll is positioned along the path of travel between the first hot roll and the intermediate web processor; when the ply production zone includes a second heated roll, the intermediate web processor is positioned between the first heated roll and the second heated roll along the filament path.

Further, referring to fig. 1 and 2, which schematically show an embodiment of the production system of the composite fiber of the present invention, after spinning the bicomponent fiber L1 from the first spinneret plate of the spinning pack 1, the bicomponent fiber L passes through the bicomponent cooling zone of the cooling mechanism 2 and then runs to the bicomponent oiling zone of the oiling mechanism 3, after oiling there, the bicomponent tow is formed and is threaded through the thread guide 4, and then passes through the scissors device 5 (the scissors device 5 is not operated in normal production, only plays a role of scissors the fiber in abnormal production state and temporarily holds the fiber end, so as to facilitate the extending operation in the start of the post-production), then the preliminary cohesion is performed at the pre-network processor 6, and the tow is guided and carded through the second thread distribution row 8 and then enters the first hot roll 9 for the stretching process (the first hot roll 9 cooperates with the first spinneret roll 11, the process temperature can be adjusted, etc.);

after being spun from a second spinneret plate of the spinning assembly 1, the single-component fibers L2 pass through a single-component cooling area cold area of the cooling mechanism 2 and then move to a single-component oiling area of the oiling mechanism 3, form single-component tows after being oiled at the single-component oiling area, then pass through a scissor device 5 after being guided by a yarn guiding hook frame 4, then enter a third tow dividing row 10 after being guided and carded by a first tow dividing row 7;

then, the double-component tows and the single-component tows are stranded at a fourth tow dividing row 12 (serving as a stranding and splitting device), guided and carded, conveyed and guided by a first cold roll 13, then subjected to cohesion treatment again at a middle network processor 14, then subjected to shaping treatment by a second hot roll 15, subjected to shaping temperature adjustment and the like by matching of the second hot roll 15 and a second tow dividing roll 16, subjected to retreating by an iron plate tow dividing device (the iron plate tow dividing device mainly plays a yarn guiding role, and the iron plate is made of stainless steel) 17, then subjected to final cohesion treatment in a main network processor 18, and finally wound by a winding machine 19.

Further, referring to fig. 3 and 4, another embodiment of the system for producing the composite fiber of the present invention is exemplarily shown, after being spun from the first spinneret plate of the spinning assembly 1', the bicomponent fiber L1' passes through the cooling zone of the bicomponent cooling zone of the cooling mechanism 2' and then travels to the bicomponent oiling zone of the oiling mechanism 3', where the bicomponent tow is oiled to form bicomponent tow and is guided by the guide wire hook frame 4' to pass through the scissors device 5', then the bicomponent fiber is preliminarily clasped at the pre-network processor 6', guided by the second tow guide row 8', carded into the first hot roll 9' for stretching treatment (the first hot roll 9' is used in cooperation with the first tow roll 10', the treatment temperature can be adjusted, etc.), and then enters the second hot roll 12' for setting treatment after being treated by the third tow guide row 11', and the second hot roll 12' is used in cooperation with the second tow roll 13' for adjustment of the setting temperature, etc.;

after being spun out from a second spinneret plate of the spinning assembly 1', the single-component fibers L2' pass through a single-component cooling area of a cooling mechanism 2 'and then run to a single-component oiling area of an oiling mechanism 3', are oiled to form single-component tows, then pass through a scissor device 5 'after being guided by a guide wire hooking frame 4', then are guided by a first split wire row 7 'to be carded, and then are conveyed and guided by a first cooling roller 14';

then the double-component filament bundle and the single-component filament bundle are plied, guided and carded at a fourth filament dividing row 15 '(serving as a plying filament divider), enter an intermediate network processor 16' for carrying out cohesion treatment again, are transmitted and guided by a second cold roll 17 'and then enter an iron plate filament divider 18' for carrying out treatment, and are finally plied by a main network processor 19 'and then are wound by a winding machine 20'.

In the present invention, the cooling mechanism, the oiling mechanism, the pre-network processor, the first hot roller, the intermediate network processor, the second hot roller, the main network processor, the winding machine, and the structures of the yarn dividing rows, the yarn dividing rollers, the yarn dividing devices, the scissors devices, and the yarn guiding hook frames may be conventional structures, which are not described herein in detail.

Further, in the embodiment of the present invention, optionally, the dual-component cooling zone and the single-component cooling zone are independent cooling components, respectively, or the dual-component cooling zone and the single-component cooling zone are integrally formed to form a cooling mechanism; the two-component oiling area and the single-component oiling area are respectively independent oiling nipples, or the two-component oiling area and the single-component oiling area are integrally formed to form an oiling mechanism.

Further, referring to fig. 5 to 16, several arrangements of the spinneret plate are exemplarily shown.

For example, in the structures shown in fig. 5 to 7, the number of the first spinneret plate 110 and the number of the second spinneret plate 120 are 1, and the two spinneret plates are integrally formed to form the spinneret plate 100, as shown in fig. 5, the first spinneret plate and the second spinneret plate can be arranged on the left side and the right side of the spinneret plate;

the first spinneret plate 110 has about two structures, and the internal structure of the spinneret plate shown in fig. 6 is: the first spinneret plate 110 comprises a component A receiving groove 113 for introducing a component A melt, a component B receiving groove 114 for introducing a component B melt, a component A spinneret hole 115 communicated with the component A receiving groove 113 and a component B spinneret hole 116 communicated with the component B receiving groove 114; the spinneret orifices 115 and 116 of the component A and the component B are respectively arranged in an inclined manner, and the central lines of the spinneret orifices 115 and 116 of the component B form an acute included angle which is 20-60 degrees or 30-50 degrees, specifically 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees and the like, and the first spinneret plate 110 is used for spinning the component A melt and the component B melt into parallel bi-component fibers; the second spinneret plate 120 comprises a component C receiving groove 121 for introducing the component C melt, and a second spinneret hole 122 communicated with the component C receiving groove 121, wherein the center line of the second spinneret hole 122 is perpendicular to the upper surface or the lower surface of the second spinneret plate 120, and the second spinneret plate 120 is used for spinning the component C melt into single-component fibers;

the internal structure of the spinneret shown in fig. 7 is: the first spinneret plate 110 comprises a first spinneret hole 112 and a material receiving area groove 111 for respectively introducing the component A melt and the component B melt, the first spinneret hole 112 is communicated with the material receiving area groove 111, and the first spinneret plate 110 is used for spinning the component A melt and the component B melt into parallel bicomponent fibers; the second spinneret plate 120 comprises a component C receiving groove 121 for introducing the component C melt, and a second spinneret hole 122 communicated with the component C receiving groove 121, wherein the center line of the second spinneret hole 122 is perpendicular to the upper surface or the lower surface of the second spinneret plate 120, and the second spinneret plate 120 is used for spinning the component C melt into single-component fibers;

when the component A melt is compatible or partially compatible with the component B melt, the first spinneret plate adopts the structure shown in FIG. 6; when the component A melt is incompatible with the component B melt, the first spinneret plate can adopt the structures shown in the figures 6 and 7.

For example, in the structures shown in fig. 8 to 10, there are 2

first spinneret plates

110 and 2 second spinneret plates 120, and the four spinneret plates are integrally formed to form the spinneret plate 100, as shown in fig. 8, the four spinneret plates are arranged from left to right in the following order: the first spinneret plate 110, the second spinneret plate 120, the first spinneret plate 110 and the second spinneret plate 120; the first spinneret plate has two structures, the structure of fig. 9 is similar to that of fig. 7, but the number of internally arranged spinneret holes is different, and the arrangement mode is different; the structure of FIG. 10 is similar to that of FIG. 6, and similarly, the number of internally disposed orifices is different, and the arrangement is also different.

For example, in the structure shown in fig. 11 to 13, which is similar to the structure shown in fig. 8 to 10, the first spinneret plate 110 and the second spinneret plate 120 also have 2 spinneret plates, but the four spinneret plates are arranged in different order from left to right, as shown in fig. 11, the four spinneret plates are arranged in the order from left to right: the first spinning plate 110, the second spinning plate 120 and the first spinning plate 110; fig. 12 and 13 show the arrangement of the internal spinneret holes and the receiving slots, respectively.

For example, in the structure shown in fig. 14 to 16, which is similar to the structure shown in fig. 8 to 10, the first spinneret plate 110 and the second spinneret plate 120 also have 2 spinneret plates, but the four spinneret plates are arranged in different order from left to right, as shown in fig. 14, the four spinneret plates are arranged in the order from left to right: the second spinneret plate 120, the first spinneret plate 110 and the second spinneret plate 120; fig. 15 and 16 show the arrangement of the internal spinneret holes and the receiving slots, respectively.

Specifically, before entering the spinning assembly, the component A, the component B and the component C are respectively and independently obtained by melt extrusion or melt direct spinning of a screw extruder.

Further, when the component A, the component B and the component C adopt the polyethylene terephthalate (PET), the polybutylene terephthalate (PBT) and the poly-1, 3-trimethylene terephthalate (PTT) as raw materials, the component A, the component B and the component C are respectively melt-extruded by screw extruders and are conveyed to respective metering pumps and spinning manifold bodies through respective melt pipelines, and the temperature of screws in each zone of the component A is controlled at 220-310 ℃,220-310 ℃,220-310 ℃ and 220-310 ℃; the temperature of screws in each area of the component B is controlled at 220-290 ℃,220-290 ℃,220-290 ℃,220-290 ℃ and 220-290 ℃; the temperature of each area of the screw of the component C is controlled to be 220-295 ℃,220-295 ℃,220-295 ℃,220-295 ℃ and 220-295 ℃; the temperature of the pipelines of the box bodies of the component A, the component B and the component C is respectively controlled at 220-305 ℃,220-288 ℃ and 220-292 ℃.

As an alternative embodiment, the component A and the component B are respectively melt-extruded by a screw extruder, the component C is obtained by melt direct spinning, and the temperature of a pipeline and a box body of the component C is controlled to be 220-292 ℃.

Further, when the component A, the component B and the component C adopt the polyethylene terephthalate (PET), the polybutylene terephthalate (PBT) and the poly-1, 3-trimethylene terephthalate (PTT) as raw materials, the crystallization temperature of the component A, the component B and the component C is controlled to be 105-180 ℃, the drying temperature is controlled to be 100-180 ℃, and the required dry slices are prepared, so that the water content is less than or equal to 40ppm.

As an optional implementation mode, the cooling mechanism can adopt circular blowing for cooling, and the wind pressure is 10-50Pa; the pressure of pre-network treatment is 0.3-2.5bar, the pressure of intermediate network treatment is 1.0-5.0bar, and the pressure of main network treatment is 1.0-5.0bar; the temperature of the first hot roller is 45-90 ℃, the temperature of the second hot roller is 95-160 ℃, and the drawing multiple is 1.1-3.5.

In the invention, the speed of winding forming can be selected from 2500-5500m/min.

The above-described scheme is further illustrated below with reference to specific examples; it is to be understood that these embodiments are provided to illustrate the general principles, essential features and advantages of the present invention, and the present invention is not limited in scope by the following embodiments; the implementation conditions used in the examples can be further adjusted according to specific requirements, and the implementation conditions not indicated are generally the conditions in routine experiments.

Not specifically illustrated in the following examples, all starting materials are commercially available or prepared by methods conventional in the art.

Example 1

The present example provides a method for producing a composite fiber using the production system shown in fig. 1-2, and the spinneret in the spinning pack has the structure shown in fig. 5 and 6.

Specifically, raw material selection: component A is PET with the intrinsic viscosity of 0.92dL/g, component B is PET with the intrinsic viscosity of 0.4dL/g, and component C is PET with the intrinsic viscosity of 0.65 dL/g; wherein, the composite fiber is controlled by the mass percentage, the component A accounts for 22 percent, the component B accounts for 22 percent and the component C accounts for 56 percent.

The production specification of this example was 180D/108F conjugate fiber.

The process conditions are as follows: before entering a spinning assembly, the crystallization temperature of the component A, the component B and the component C is controlled to be 170 ℃, the drying temperature is controlled to be 168 ℃, and after drying, the moisture value is respectively tested to be 21ppm,25ppm and 20ppm;

then respectively and independently pass through a screw extruder to be subjected to melt extrusion to obtain:

temperature of each zone of the screw for component A: 265 ℃,275 ℃,288 ℃,305 ℃,305 ℃;

temperature of each zone of the screw for component B: 258 ℃,268 ℃,285 ℃,285 ℃,285 ℃;

temperature of each zone of the screw for component C: 262 ℃,272 ℃,278 ℃,290 ℃,290 ℃;

the pipeline temperature of each box body of the component A, the component B and the component C is 298 ℃;278 ℃;290 ℃;

cooling by circular blowing, wherein the air pressure is 30Pa; the height of an oil frame (the position of an oiling cluster point, the higher the height of the oil frame, the larger the spinning tension, and conversely, the smaller the spinning tension): 1000mm;

the pressure of pre-network treatment is 1.0bar, the pressure of intermediate network treatment is 3.0bar, and the pressure of main network treatment is 2.5bar; the speed of the roll forming was 2800m/min, the temperature of the first heat roll treatment (stretching temperature) was 88 ℃, the temperature of the second heat roll treatment (setting temperature) was 120 ℃, and the draft ratio was 2.8.

The composite fibers were subjected to the following performance tests, and the specific results are shown in table 1.

TABLE 1

Test item	Unit of	As a result, the	Test method
				Linear density of	dtex	198	GB/T 14343-2008
Breaking strength	cN/dtex	2.05	GB/T 14344-2008
				Elongation at break	％	21.2	GB/T 14344-2008
Evenness CV	％	1.54	GB/T 14346-2015
				Oil content	％	1.0	GB/T 6504-2017
Shrinkage in boiling water	％	38	GB/T 6505-2017
				Network degree	Per meter	12	FZ/T 50001-2005
Appearance of the product	/	Is normal	Visual inspection of
				Crimp shrinkage	％		13	GB/T 6506-2017
AA color rating	/	4	GB/T 6508-2015

The composite fiber prepared by the method is subjected to a subsequent weaving process, which comprises the following steps: water-jet shuttle weft application (loom is Jintian horse, ZW-8100, the same as below), 11 twists, yarn steaming temperature of 80 ℃ twice for 40min, and weaving speed of 650r/min; the dyeing setting temperature is 190 ℃, and the width of the machine is 208cm. A schematic structural diagram of the prepared composite fiber 400 after boiling water heat setting before weaving is shown in fig. 17 (the bicomponent filament bundle 300 is inside, the single component filament bundle 200 is entwined around the outer surface of the bicomponent filament bundle 300 in a wavy shape, and the wavy arch density of the single component filament bundle 200 is high).

The cross-sectional view of the resulting composite fiber is shown in FIG. 18, where the bicomponent cross-section is substantially "peanut-shaped" and the monocomponent cross-section is substantially circular.

The composite fiber prepared in this example was subjected to the following weaving process and the results were counted or tested, and the results are shown in table 2 below.

TABLE 2

Comparative example 1

It is essentially the same as example 1 except that: the method comprises the steps of pre-network treating the double-component filament bundles, directly plying the double-component filament bundles and the single-component filament bundles, then enabling the double-component filament bundles and the single-component filament bundles to enter a first hot roller for stretching treatment, enabling the double-component filament bundles and the single-component filament bundles to enter a second hot roller for shaping treatment, enabling the double-component filament bundles and the single-component filament bundles to enter an intermediate network processor for secondary cohesion treatment, enabling the double-component filament bundles and the single-component filament bundles to be wound by a winding machine after the double-component filament bundles and the single-component filament bundles are finally cohesive by a main network processor.

The composite fiber obtained was subjected to the following performance tests, and the specific results are shown in table a.

TABLE a

Test item	Unit	Results	Test method
				Linear density of	dtex	198	GB/T 14343-2008
Breaking strength	cN/dtex	2.5	GB/T 14344-2008
				Elongation at break	％		20	GB/T 14344-2008
Evenness CV	％	1.52	GB/T 14346-2015
				Oil content	％	1.0	GB/T 6504-2017
Shrinkage in boiling water	％		12					GB/T 6505-2017
				Network degree	Per meter	12	FZ/T 50001-2005
Appearance of the product	/	Is normal and normal	Visual inspection of
				Shrinkage of crimp	％		12	GB/T 6506-2017
AA color grade	/	4.0	GB/T 6508-2015

Fig. 19 shows a schematic structure of the prepared composite fiber 400' after boiling water heat setting before weaving.

Comparative example 2

It is essentially the same as example 1 except that: after pre-network treatment, the bicomponent filament bundle enters a first hot roller for stretching treatment and a second hot roller for shaping treatment;

allowing the single-component filament bundle to enter a first hot roller for stretching treatment and a second hot roller for shaping treatment;

and then the double-component tows and the single-component tows which are respectively subjected to stretching treatment and shaping treatment are plied, enter a middle network processor for carrying out cohesion treatment, are subjected to final cohesion treatment by a main network processor and then are wound by a winding machine.

The resulting composite fibers were subjected to the following performance tests, and the specific results are shown in table b.

Table b

Test item	Unit	As a result, the	Test method
				Linear density of	dtex	198	GB/T 14343-2008
Breaking strength	cN/dtex	2.7	GB/T 14344-2008
				Elongation at break	％		20	GB/T 14344-2008
Evenness CV	％	1.5	GB/T 14346-2015
				Oil content	％	1.0	GB/T 6504-2017
Shrinkage in boiling water	％	8.5	GB/T 6505-2017
				Network degree	Per meter	12	FZ/T 50001-2005
Appearance of the product	/	Is normal and normal	Visual inspection of
				Crimp shrinkage	％	12.5	GB/T 6506-2017
AA color grade	/	4.0	GB/T 6508-2015

In comparison with comparative examples 1 and 2, the shrinkage in boiling water is significantly increased in example 1, which indicates that the fabric sample has a stronger napped feel. Further, as shown in fig. 20, after boiling water thermal setting, comparative example 1 has no obvious change, while the yarn of example 1 of the present invention has obvious fluffy feeling, and the single component fiber wound on the outer side has a continuously repeated wavy state, which finally can make the cloth cover have better fluffy feeling, as shown in fig. 21, the cloth cover made of the composite fiber of comparative example 1 is the left side in fig. 21, and the cloth cover made of the composite fiber of example 1 of the present invention is the right side in fig. 21, it can be known that the present invention has obviously better fluffy feeling.

Example 2

This example provides a method of producing composite fibers using the production system described above and illustrated in fig. 1-2, with the spinneret in the spin pack selected from the configurations shown in fig. 5 and 6.

Specifically, raw material selection: component A is PTT with the intrinsic viscosity of 1.25dL/g, component B is PET with the intrinsic viscosity of 0.42dL/g, and component C is PET with the intrinsic viscosity of 0.65 dL/g; wherein, in the composite fiber, the mass percentage content is controlled to be 19 percent of the component A, 19 percent of the component B and 62 percent of the component C.

The production specification of this example was 133D/108 conjugate fiber.

The process conditions are as follows:

before entering a spinning assembly, the crystallization temperature of the component A is controlled to be 150 ℃, the drying temperature is controlled to be 148 ℃, the crystallization temperature of the component B and the component C is controlled to be 170 ℃, the drying temperature is controlled to be 168 ℃, and after drying, the water content values are respectively tested to be 18ppm,25ppm and 20ppm;

then respectively and independently melt-extruding through a screw extruder to obtain:

temperature of each zone of the screw for component A: 225 ℃,245 ℃,268 ℃,268 ℃ and 268 ℃;

temperature of each zone of the screw for component B: 255 ℃,265 ℃,282 ℃,282 ℃;

the pipeline temperature of each box body of the component A, the component B and the component C is 265 ℃;275 ℃;288 ℃;

cooling by circular blowing, wherein the air pressure is 30Pa; height of the oil rack: 1000mm;

the pressure of pre-network treatment is 1.0bar, the pressure of intermediate network treatment is 3.0bar, and the pressure of main network treatment is 2.5bar; the speed of the roll forming was 3000m/min, the temperature of the first hot roll treatment (stretching temperature) was 75 ℃, the temperature of the second hot roll treatment (setting temperature) was 140 ℃, and the draft ratio was 2.6.

The composite fibers were subjected to the following performance tests, and the specific results are shown in table 3.

TABLE 3

The composite fiber prepared by the method is subjected to a subsequent weaving process, which comprises the following steps: the weft-weaving method comprises the following steps of (1) water-jet woven weft-weaving application, 11 twists, a yarn steaming temperature of 80 ℃ for 1 time and 120min, and a weaving speed of 600r/min; dyeing and setting temperature is 180 ℃, and the width of the machine is 220cm. The cloth surface has high velvet feeling and elasticity.

The composite fiber prepared as described above in this example was subjected to the following weaving process and the results were counted or tested, and the results are shown in table 4 below.

TABLE 4

Example 3

Specifically, raw material selection: the component A is PBT with the intrinsic viscosity of 1.25dL/g, the component B is PET with the intrinsic viscosity of 0.4dL/g, and the component C is modified PET with the intrinsic viscosity of 0.65dL/g (Jiangsu Zhongpercidae technology development Co., ltd., brand number F07-1111); wherein, the composite fiber is controlled by the mass percentage, the component A accounts for 18 percent, the component B accounts for 18 percent and the component C accounts for 64 percent.

The production specification of this example was 80D/84F conjugate fiber.

The process conditions are as follows:

before entering the spinning assembly, the crystallization temperature of the component A is controlled to be 130 ℃, the drying temperature is controlled to be 125 ℃, the crystallization temperature of the component B and the component C is controlled to be 170 ℃, the drying temperature is controlled to be 168 ℃, and after drying, the water content values are respectively tested to be 20ppm,25ppm and 38ppm;

temperature of each zone of the screw for component B: 255 ℃,265 ℃,278 ℃,278 ℃ and 278 ℃;

temperature of each zone of the screw for component C: 262 ℃,272 ℃,278 ℃,282 ℃ and 282 ℃;

the pipeline temperature of each box body of the component A, the component B and the component C is 262 ℃ respectively; 275 ℃;280 ℃;

cooling by circular blowing, wherein the air pressure is 20Pa; height of the oil rack: 800mm;

the pressure of pre-network treatment is 0.6bar, the pressure of intermediate network treatment is 3.0bar, and the pressure of main network treatment is 2.0bar; the speed of the roll forming was 3000m/min, the temperature of the first hot roll treatment (stretching temperature) was 72 ℃, the temperature of the second hot roll treatment (setting temperature) was 128 ℃, and the draft ratio was 2.2.

The resulting composite fibers were subjected to the following performance tests, and the specific results are shown in table 5.

TABLE 5

Test items	Unit of	As a result, the	Test method
				Linear density of	dtex	88	GB/T 14343-2008
Breaking strength	cN/dtex	2.7	GB/T 14344-2008
				Elongation at break	％		20	GB/T 14344-2008
Evenness CV	％	1.6	GB/T 14346-2015
				Oil content	％		1	GB/T 6504-2017
Shrinkage in boiling water	％	28	GB/T 6505-2017
				Network degree	Per meter	12	FZ/T 50001-2005
Appearance of the product	/	Is normal	Visual inspection of
				Shrinkage of crimp	％	26	GB/T 6506-2017
AA color rating	/	4	GB/T 6508-2015

The composite fiber prepared by the method of the embodiment is subjected to the subsequent weaving process, which comprises the following steps: the weft-weaving method comprises the following steps of (1) water-jet woven weft-weaving application, 11 twists, a yarn steaming temperature of 80 ℃ for 1 time and 120min, and a weaving speed of 600r/min; dyeing and setting temperature is 180 ℃, and the width of the machine is 220cm.

The cloth cover is suitable for tatting and knitting, has high velvet feeling and elasticity, has a double-color effect due to the main modification characteristic, and has a double-color effect of white and dyed colors after being dyed as shown in figure 22.

The composite fiber prepared in this example was subjected to the following weaving process and the results were counted or tested, and the results are shown in table 6 below.

TABLE 6

Example 4

Specifically, raw material selection: the component A is PET with the intrinsic viscosity of 0.86dL/g (the product of the development of the Technological technology of Micropteridae, inc. in Jiangsu, the brand number is F02-1111), the component B is PET with the intrinsic viscosity of 0.47dL/g, and the component C is PET with the intrinsic viscosity of 0.65 dL/g; wherein, the composite fiber is controlled by the mass percentage, the component A accounts for 22 percent, the component B accounts for 22 percent and the component C accounts for 56 percent.

The production specification of this example is 180D/108F composite fiber.

The process conditions are as follows:

before entering a spinning assembly, the crystallization temperature of the component A is controlled to be 138 ℃, the drying temperature is controlled to be 135 ℃, the crystallization temperature of the component B and the component C is controlled to be 170 ℃, the drying temperature is controlled to be 168 ℃, and after drying, the water content values are respectively 33ppm,25ppm and 20ppm;

temperature of each zone of the screw for component A: 265 ℃,275 ℃,288 ℃,289 ℃,289 ℃;

the pipeline temperatures of the box bodies of the component A, the component B and the component C are 283 ℃,275 ℃ and 288 ℃ respectively;

the pressure of pre-network treatment is 1.0bar, the pressure of intermediate network treatment is 3.0bar, and the pressure of main network treatment is 2.5bar; the speed of the roll forming was 2800m/min, the temperature of the first heat roll treatment (stretching temperature) was 85 ℃, the temperature of the second heat roll treatment (setting temperature) was 126 ℃, and the draft ratio was 2.8.

The composite fibers were subjected to the following performance tests, and the specific results are shown in table 7.

TABLE 7

Test items	Unit of	Results	Test method
				Linear density of	dtex	198	GB/T 14343-2008
Breaking strength	cN/dtex	1.65	GB/T 14344-2008
				Elongation at break	％	22	GB/T 14344-2008
Evenness CV	％	1.6	GB/T 14346-2015
				Oil content	％		1	GB/T 6504-2017
Boiling waterShrinkage rate	％	26	GB/T 6505-2017
				Network degree	Per meter	12	FZ/T 50001-2005
Appearance of the product	/	Is normal and normal	Visual inspection of
				Shrinkage of crimp	％	24	GB/T 6506-2017
AA color rating	/	4	GB/T 6508-2015

The composite fiber prepared by the method of the embodiment is subjected to the subsequent weaving process, which comprises the following steps: for water-jet woven weft, 11 twists, the yarn steaming temperature of 80 ℃ twice for 40min, and the weaving speed of 650r/min; the dyeing setting temperature is 150 ℃, and the width of the machine is 208cm.

The composite fiber prepared as described above in this example was subjected to the following weaving process and the results were counted or tested, and the results are shown in table 8 below.

TABLE 8

This example is suitable for tatting and knitting, the cloth cover has high velvet feeling and elasticity, can be colored at low temperature, and has a dyeing depth of more than 2 grades, as shown in fig. 23, when the stocking is dyed at 100 ℃, the stocking made of the composite fiber of the conventional comparative example 1 is dyed as shown in the left side of fig. 23, and the stocking made of the composite fiber of this example is dyed as shown in the right side of fig. 23.

Example 5

Specifically, raw material selection: the component A is modified PET (national hope high fiber Co., ltd., jiangsu, brand L01-1111) with the intrinsic viscosity of 0.85dL/g, the component B is PET with the intrinsic viscosity of 0.47dL/g, and the component C is PET with the intrinsic viscosity of 0.65 dL/g; wherein, in the composite fiber, the component A accounts for 22 percent, the component B accounts for 22 percent and the component C accounts for 56 percent by weight percentage.

The production specification of this example is 180D/108F composite fiber.

The process conditions are as follows:

before entering a spinning assembly, the crystallization temperature of the component A is controlled to be 130 ℃, the drying temperature is controlled to be 128 ℃, the crystallization temperatures of the component B and the component C are controlled to be 170 ℃, the drying temperature is controlled to be 168 ℃, and after drying, the moisture values are respectively 32ppm,25ppm and 20ppm;

temperature of each zone of the screw for component A: 265 ℃,275 ℃,288 ℃,295 ℃,295 ℃;

temperature of each zone of the screw for component B: 258 ℃,268 ℃,285 ℃,285 ℃ and 285 ℃;

the pipeline temperature of each box body of the component A, the component B and the component C is 290 ℃;278 ℃;288 ℃;

The composite fibers were subjected to the following performance tests, and the specific results are shown in table 9.

TABLE 9

The composite fiber prepared by the method of the embodiment is subjected to the subsequent weaving process, which comprises the following steps: the weft-wise application of water-jet tatting is that 11 twists are formed, the yarn steaming temperature is 80 ℃ for 40min twice, and the weaving speed is 650r/min; the dyeing setting temperature is 190 ℃, and the width of the machine is 208cm.

The composite fiber prepared in this example was subjected to the following weaving process and the results were counted or tested, and the results are shown in table 10 below.

TABLE 10

The application is as follows: is suitable for tatting and knitting, and has stronger cloth cover velvet feeling and drapability.

Example 6

This example provides a method of producing composite fibers using the production system described above and illustrated in fig. 3-4, with the spinneret in the spin pack selected from the configurations shown in fig. 5 and 6.

Specifically, raw material selection: the component A is modified PET (national hope high fiber Co., ltd., jiangsu, brand L01-1111) with the intrinsic viscosity of 0.85dL/g, the component B is PET with the intrinsic viscosity of 0.47dL/g, and the component C is PET with the intrinsic viscosity of 0.65 dL/g; wherein, the composite fiber is controlled by the mass percentage, the component A accounts for 22 percent, the component B accounts for 22 percent and the component C accounts for 56 percent.

The production specification of this example was 180D/108F conjugate fiber.

The process conditions are as follows:

before entering a spinning assembly, the crystallization temperature of the component A is controlled to be 130 ℃, the drying temperature is controlled to be 128 ℃, the crystallization temperature of the component B and the component C is controlled to be 170 ℃, the drying temperature is controlled to be 168 ℃, and after drying, the water content values are respectively 32ppm,25ppm and 20ppm;

temperature of each zone of the screw for component A: 265 ℃,275 ℃,288 ℃,295 ℃ and 295 ℃;

The resulting composite fibers were subjected to the following performance tests, and the specific results are shown in table 11.

TABLE 11

Test item	Unit	As a result, the	Test method
				Linear density of	dtex	198	GB/T 14343-2008
Breaking strength	cN/dtex	1.70	GB/T 14344-2008
				Elongation at break	％	22	GB/T 14344-2008
Evenness CV	％	1.53	GB/T 14346-2015
				Oil content	％		1	GB/T 6504-2017
Shrinkage in boiling water	％	45	GB/T 6505-2017
				Network degree	Per meter	12	FZ/T 50001-2005
Appearance of the product	/	Is normal	Visual inspection of
				Shrinkage of crimp	％	26.5	GB/T 6506-2017
AA color rating	/	4	GB/T 6508-2015

The composite fiber prepared in this example was subjected to a subsequent weaving process and the results were counted or tested, and the results are shown in table 12 below.

TABLE 12

The application is as follows: the method is suitable for tatting and knitting, and the boiling water shrinkage is increased by 3% due to the difference of silk paths under the same process conditions as those in the embodiment 5 in the embodiment 6.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.

Claims

1. A method for producing a composite fiber, comprising: respectively taking a polymer with a first intrinsic viscosity as a component A, a polymer with a second intrinsic viscosity as a component B and a polymer with a third intrinsic viscosity as a component C, wherein the first intrinsic viscosity is greater than the second intrinsic viscosity;

spinning the component A, the component B and the component C by the same spinning assembly to enable the component A and the component B to spin side-by-side bicomponent fibers, and the component C to spin single-component fibers;

then, the treatment is performed by the method (i) or the method (ii):

mode (i): processing a bicomponent tow formed by spun bicomponent fibers according to an FDY (fully drawn yarn) process, and in the FDY process, continuously processing the bicomponent tow processed by a first hot roller and a monocomponent tow formed by the spun monocomponent fibers according to the FDY process after the bicomponent tow and the monocomponent tow are folded;

2. The method of producing a composite fiber according to claim 1, wherein the third intrinsic viscosity is greater than the second intrinsic viscosity and less than the first intrinsic viscosity.

3. The method of producing a conjugate fiber as claimed in claim 1, wherein the difference between the first intrinsic viscosity and the second intrinsic viscosity is 0.1 to 0.9dL/g, and further 0.3 to 0.9dL/g.

4. A method for producing a composite fiber according to claim 1, 2 or 3, wherein the component a is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.75-1.2dL/g, polybutylene terephthalate with an intrinsic viscosity of 1.0-1.4dL/g, and poly (1, 3-propylene terephthalate) with an intrinsic viscosity of 1.0-1.4 dL/g;

the component B is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.40-0.66dL/g, polybutylene terephthalate with an intrinsic viscosity of 0.80-0.95dL/g, and poly (1, 3-propylene terephthalate) with an intrinsic viscosity of 0.80-0.95 dL/g;

the component C is selected from at least one of the following polymers: polyethylene terephthalate with an intrinsic viscosity of 0.50-0.70dL/g, polybutylene terephthalate with an intrinsic viscosity of 0.85-1.0dL/g, and poly (1, 3-propylene terephthalate) with an intrinsic viscosity of 0.85-1.0 dL/g.

5. The method for producing a composite fiber according to claim 1, wherein the component a is 10% to 80%, the component B is 10% to 80%, and the component C is 10% to 80% in the composite fiber by mass percentage.

6. The method of claim 1, wherein the spinning assembly comprises a spinneret plate, the spinneret plate comprises a first spinneret plate and a second spinneret plate, the first spinneret plate and the second spinneret plate are used for spinning the side-by-side bicomponent fibers, and the first spinneret plate and the second spinneret plate are integrally formed to form the spinneret plate.

7. The method for producing composite fibers according to claim 6, wherein the number of the first spinneret plate and the second spinneret plate is equal to at least one.

8. The method of producing a composite fiber according to claim 6, wherein the first spinneret plate has either one of the following two structures;

9. The method for producing composite fibers according to claim 8, wherein the second spinneret plate comprises a component C receiving groove for introducing a component C melt, and a second spinneret hole communicated with the component C receiving groove, and a center line of the second spinneret hole is perpendicular to an upper surface or a lower surface of the second spinneret plate.

10. The method for producing the composite fiber according to claim 1, wherein the component A, the component B and the component C are respectively and independently obtained by melt extrusion or melt direct spinning through a screw extruder before entering the spinning assembly.

11. The method for producing a composite fiber according to claim 1, wherein the embodiment of the mode (i) includes: cooling and oiling a plurality of spun bicomponent fibers to form bicomponent tows, and respectively carrying out pre-network treatment and first hot roller treatment on the bicomponent tows;

cooling and oiling the spun monocomponent fiber to form monocomponent tows;

and (3) stranding the double-component tows and the single-component tows which are processed by the first hot roller, performing middle network processing, second hot roller processing and main network processing, and winding and forming.

12. The method of claim 1, wherein embodiment (ii) comprises: cooling and oiling a plurality of spun bicomponent fibers to form bicomponent tows, and respectively carrying out pre-network treatment, first hot roller treatment and second hot roller treatment on the bicomponent tows;

cooling and oiling the spun monocomponent fiber to form monocomponent tows;

13. The method for producing a conjugate fiber according to claim 11 or 12, wherein in the embodiment of mode (i) or the embodiment of mode (ii):

the winding forming speed is 2500-5500m/min.

14. A composite fiber produced by the production method described in any one of claims 1 to 13.

15. Use of the composite fiber of claim 14 in woven and knitted fabrics.