CN116024714B - Preparation method of untwisted sizing-free polyester warp yarn - Google Patents
Preparation method of untwisted sizing-free polyester warp yarn Download PDFInfo
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Abstract
The invention relates to a preparation method of untwisted slurry-free polyester warp yarns, which comprises the steps of preparing untwisted slurry-free polyester warp yarns by pre-oriented polyester fibers through a texturing process; the fineness of the pre-oriented polyester fiber is 22-137 dtex, and the dpf value is 0.306-3.333; the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns; the draft multiple is 1.10-1.30, the twist degree of the false twister A and the twist direction of the false twister B are the same, and the inlet yarn guides of the false twister A and the false twister B adopt rotary yarn guides. The special technological method and equipment of the invention are improved, and the polyester yarn with the advantages of high strength, high elongation, uniform and firm network degree, no fuzzing, no residual twist of the yarn bundles and the like can be prepared, and the wear resistance, yarn hairiness index, breaking strength and friction fastness of the product after warping can meet the requirements of being directly used for weaving.
Description
Technical Field
The invention belongs to the technical field of textile, and relates to a preparation method of untwisted slurry-free polyester warp yarns.
Background
Compared with other fibers, the industrialized production start of the polyester yarn is late, but the polyester yarn has the advantages of easy production of raw materials, excellent performance and wide application range, so that the polyester yarn is widely applied to clothing, decoration, industry and high and new technology industries.
The polyester untwisted yarn fabric is softer, has higher comfort, better hand feeling, higher moisture absorption and moisture permeability and higher warmth retention, and the untwisted yarn is usually produced by adopting a strand unwinding stranding method/an elastic stranding method, but the production efficiency is low and the difficulty is higher because of strand stranding after unwinding and positioning stranding by an elastic machine, for example, 8dtex/18f two-bundle silk stranding is needed for producing 16dtex/36f untwisted yarn, the tow fineness is halved, the production difficulty is increased, and the fineness is 8dtex and the production difficulty is higher.
The warp yarn warping machine has the advantages that a certain number of terylene finished yarn is wound on a warp beam or a beam in parallel according to the specified length and width, so that warp yarn warping and sizing can effectively stabilize warp yarn strength and avoid warp yarn winding, the warp yarn is wear-resistant and difficult to break after sizing, and the weaving efficiency is improved to a certain extent. The sizing process has drawbacks in addition to the benefits above. On one hand, desizing treatment is needed before dyeing the finished cloth in the sizing process, and the process flow is more and complex; on the other hand, the slurry belongs to chemicals, and is not in accordance with the green sustainable development idea advocated by the nation. Whereas conventional untwisted yarn as warp yarn must undergo a sizing process in order to enhance weaving.
The existing slurry-free scheme comprises: the literature (shallow analysis realizes the technical production practice of non-sizing weaving, national society of sizing and sizing technology 2012, P113-115) is added with high-strength enzymolysis silk to compound and coat aqueous coating glue or PU emulsion surface film formation; the patent application CN201911197416.6 is a high-strength sizing-free polylactic acid yarn and a preparation method thereof, wherein the middle skin layer has a low melting point, the core layer has a high melting point, the heating temperature is higher than that of the skin layer and lower than that of the core layer, the binding effect of the melted skin layer on the core layer is utilized to reduce hairiness and increase fiber cohesion, the high strength and sizing-free performance of the yarn are realized, and the yarn is actually a composite yarn with a high-low melting point skin-core structure.
However, the enzymolysis yarn and the polylactic acid yarn are both actual composite yarns, and the yarns which are actually needed are protected from being damaged by adding high-strength and soluble component enzymolysis yarn and low-melting-point skin yarns in the prior art; once the textile task is finished, the enzymolysis part (high-strength layer) and the low-melting point part (protective layer) which play a role in protection are removed by dissolution and high-temperature melting, so that the fineness of the raw yarn needs to be increased to improve the strength and the wear resistance of the textile yarn, and the style of the textile yarn is changed; in addition, the film forming on the surface of the water-based coating adhesive or PU emulsion is only another sizing mode, and the true sizing-free mode is not realized.
Therefore, the research on the preparation method of the untwisted slurry-free polyester warp yarn which can be directly used for weaving after warping has very important significance.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a preparation method of untwisted slurry-free polyester warp yarns. The invention provides a preparation method of untwisted slurry-free polyester warp yarn, which aims to improve warping and weaving efficiency, and relates to a preparation method of high-strength untwisted polyester warp yarn by processing polyester pre-oriented yarn bundles, wherein the untwisted slurry-free polyester warp yarn has good elasticity and flexibility after weaving, meanwhile, the untwisted slurry-free polyester warp yarn prepared by the preparation method has the characteristics of strong wear resistance, high strength, high elongation, no hairiness, no residual torsion of yarn bundles and the like, the wear resistance, yarn hairiness index, breaking strength and friction fastness of the unbleached yarn bundles after warping meet the requirement of being directly used for weaving, the sizing process in the weaving process is reduced, the sizing process is called slurry-free warp yarn, the working efficiency of textile enterprises is improved, and the environment-friendly concept of sustainable development of textile enterprises is met.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the preparation method of the untwisted slurry-free polyester warp yarn comprises the steps that the untwisted slurry-free polyester warp yarn is prepared by a pre-oriented polyester fiber through a texturing process;
the fineness of the pre-oriented polyester fiber is 22-137 dtex, and the dpf value is 0.306-3.333;
the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns;
the draft multiple (the draft multiple refers to the ratio of the speed of the second wire feeding roller to the speed of the first wire feeding roller) is 1.10-1.30, the twist degrees of the false twister A and the false twister B are the same, the twist directions are different, and the inlet wire guides of the false twister A and the false twister B adopt rotary wire guides.
In the texturing process, the draft multiple, namely the speed ratio of the second yarn feeding roller to the first yarn feeding roller, is determined according to the fineness and dpf value of the yarn bundle, so as to find the optimal draft multiple of the warp yarn. The smaller the dpf is, the finer the monofilament is, the stretching multiple is not too high, the broken filaments are easy to pull out, and the broken filaments directly influence entanglement between adjacent yarns of the warp and the broken end rate during warp weaving; the stretching multiple is too low, the drawing is insufficient, and the drawing is easy to produce warp strips for warp yarns. The invention adopts the draft ratio of 1.10-1.30 (the draft ratio is usually 1.55-1.75 in the prior art), the relatively lower draft ratio, the twisting and untwisting tension of the tows produced by the texturing machine is lower, the damage of the tows can be reduced, the hairiness (easy generation of hairiness with smaller dpf value) is facilitated to be reduced, and the strength of the tows is improved.
Moreover, compared with the texturing equipment in the prior art, the false twister with two different twisting directions is adopted, the twisting degrees of the two twisting directions are mutually offset to form a non-twisting effect, the unwinding performance of the tows and the strength of the tows after the tows are unwound are improved from the side surface because of the non-twisting degree, the inlet guide of the false twister adopts the rotary guide, the friction resistance of the tows and the rotary guide is reduced, and compared with the scheme that the inlet of the false twister is fixed on the guide in the prior art, the stretching and the strength of the tows are improved to a certain extent.
Therefore, the invention can meet the use requirement of the sizing-free warp yarn only by changing the texturing process parameters and simply modifying equipment, and the produced untwisted sizing-free polyester warp yarn belongs to functional fibers, thereby effectively shortening the weaving process and greatly improving the weaving efficiency.
As a preferable technical scheme:
according to the preparation method of the untwisted slurry-free polyester warp yarn, the pre-network air pressure is 0.03-0.07 MPa, the first modified hot box temperature is 190-210 ℃, the cooling plate length is 1.2m, the cooling temperature is 26-32 ℃, the second shaping hot box temperature is 150-180 ℃, the second yarn feeding roller speed is 450-800 m/min, the speed ratio of a false twister A is 1.5-2.0, the speed ratio of a false twister B is 1.5-2.0 (the speed ratio of the false twister is the ratio of the false twister speed to the second yarn feeding roller speed), the medium network air pressure is 0.07-0.20 MPa, the shaping yarn feeding roller overfeeding is-5.5-3.0%, the oiling is controlled by an oiling agent pump, the rotating speed of the oiling agent pump is 5-40 r/min, and the DTY winding shaping overfeeding is-5.0-2.0%.
The polyester yarns are heated to the vitrification temperature in the first deformation hot box, and the higher the temperature of the first deformation hot box is, the stronger the molecular chain mobility of the polyester yarns is, so that the physical properties of the polyester yarns such as strength, elongation and the like are directly affected; in a certain temperature range, the strength of the polyester yarn bundle is increased along with the temperature rise, the elongation is slightly reduced, and the curling shrinkage is increased. The strength is increased, so that the wear resistance of the tows is improved, and the warp sizing-free warp yarn has the beneficial effect in the later stage. However, the temperature is too high, which is easy to cause terylene plasticization and strength reduction, and is unfavorable for the use of the post sizing-free warp yarns. The temperature of the first deformation hot box in the process flow is set at 190-210 ℃, and is 10-30 ℃ higher than that of the conventional process variety with the same specification, so that the polyester molecular chains are more active, the full stretching deformation is facilitated, the effective improvement of the strength of the tows is ensured, and the elongation also meets the use requirement of the sizing-free warp yarns; and 205-210 ℃ is the highest point of thermal stability of the polyester yarn, and the molecular chains are recombined, namely recombined and recrystallized at the temperature higher than the highest point, so that the style is changed.
And presetting the tows after the stretching deformation in the processing process, and fixing the appearance form of the tows. The temperature setting of the second shaping hot box is particularly important, the temperature is required to be set between 150-180 ℃ (the conventional process is closed or 130-140 ℃), the shaping temperature is high, the curling shrinkage rate is reduced, the bonding and cohesion among monofilament fibers in the product are good, the curling stability is improved, the tows are relatively straight to unwind and are not easy to wind and tie, and the sizing-free warp is beneficial to post spinning.
The second yarn feeding roller speed is the processing speed, and the processing speed is closely related to the network air pressure in the process flow. In order to increase the network degree and network fastness of the tows and reduce the yarn breakage rate in the production process, the processing speed is set to be lower than that of the conventional variety. The increase of the network degree and the network fastness is beneficial to improving the cohesion between warp monofilaments, and has the beneficial effect of avoiding warp sizing; the network degree and the fastness are improved simply by improving the network pressure, so that the monofilament in the filament bundle is easy to damage; the invention adopts a speed reduction mode, on one hand, the yarn breakage rate in production can be reduced, and in addition, the network degree and network fastness at low speed under the same network pressure can be improved. The second yarn feeding roller is adopted, the speed is 450-800 m/min, the medium-network air pressure is 0.07-0.20 MPa, the network degree of the sizing-free polyester warp yarn is stable, the network fastness is good, the cohesion among the filaments of the yarn bundle is improved, and the wear resistance of the yarn is effectively improved.
The twisting direction of the false twister A is S twisting, the twisting direction of the false twister B is Z twisting (if the false twister A is Z twisting, the false twister B is S twisting, the effect can be achieved theoretically, but the rising effect is poor in the actual operation process, the rising is easy to break, the efficiency is greatly influenced), and the twisting directions of the two twisting directions are mutually counteracted to form the untwisted effect.
According to the preparation method of the untwisted slurry-free polyester warp yarn, the twist range of the false twister A and the false twister B is 5-45 r/m.
According to the preparation method of the untwisted slurry-free polyester warp yarn, the false twister A and the false twister B are both friction disc false twisters, the disc at the bottommost layer is a ceramic knife edge disc (called knife edge disc for short), the disc at the topmost layer is a ceramic disc, the disc at the middle layer is a Polyurethane (PU) floppy disc, the hardness of the polyurethane floppy disc is 70shore A, the hardness of the polyurethane floppy disc is reduced by 20% compared with the hardness of the conventional variety, the surface resistance of the disc is reduced, the twisting and untwisting tension is reduced, the internal structure of a silk bundle is complete, the strength and the elongation of a product are improved, and the preparation is made for the slurry-free warp yarn; the false twister A is a triaxial six-disc and the false twister B is a triaxial five-disc, and experiments prove that the untwisting tension of the silk strings in series can be mutually counteracted through the untwisting tension of the outlet of the triaxial six-disc S twist and the untwisting tension of the outlet of the triaxial five-disc Z twist respectively.
According to the preparation method of the untwisted sizing-free polyester warp yarn, the oiling adopts the oil nozzle oiling mode, and compared with the oil tank and oil wheel contact oiling mode in the prior art, the non-contact oiling mode is adopted by the texturing machine, so that the direct contact oiling of tows and an oiling roller is avoided, the protective effect on the physical properties of the tows is better, and the strength and the elongation of products are improved.
According to the preparation method of the untwisted slurry-free polyester warp yarn, the breaking strength of the pre-oriented polyester fiber is 2.5-3.5 cN/dtex, and the breaking elongation is 105-125%.
According to the preparation method of the untwisted slurry-free polyester warp yarn, the twist of the untwisted slurry-free polyester warp yarn is 0, the breaking strength is 5.2-5.6 cN/dtex, the elongation at break is 22-25%, the degree of network is 110-165 per meter, and the untwisted polyester warp yarn has good network fastness and no wool yarn.
According to the preparation method of the untwisted slurry-free polyester warp yarn, the wear resistance of the untwisted slurry-free polyester warp yarn after warping is 30500-33000 times, the hairiness index is 0.5-2.3/m, the breaking strength is 5.2-5.5 cN/dtex, and the dry friction fastness is 3-4 levels. The abrasion resistance, yarn hairiness index, breaking strength and friction fastness of the warp yarn after warping meet the requirements of being directly used for weaving, and the warp yarn warping machine is used for weaving parallel axis warp yarns, so that the process flow of spinning sizing is reduced.
The beneficial effects are that:
(1) According to the preparation method of the untwisted slurry-free polyester warp yarn, the special process method and equipment transformation are adopted, so that the polyester yarn with the advantages of high strength, high elongation, uniform and firm network degree, no wool, no residual twist of tows and the like can be prepared, and the wear resistance, yarn hairiness index, breaking strength and friction fastness of the product after warping can meet the requirements of being directly used for weaving;
(2) The untwisted sizing-free polyester warp yarn prepared by the method can be directly used for weaving after warping, and the sizing process flow of spinning is saved.
Drawings
FIG. 1 is a process flow diagram of a twist-free slurry-free polyester warp yarn preparation according to the present invention;
FIG. 2 is a schematic view of the rotary inlet wire guide of the false twister of FIG. 1;
the device comprises a 1-pre-oriented polyester fiber, a 2-pre-network, a 3-first wire feeding roller, a 4-first deformation hot box, a 5-cooling plate, a 6-false twister, a 7-second wire feeding roller, an 8-medium network, a 9-second shaping hot box, a 10-shaping wire feeding roller, a 11-oiling roller, a 12-nozzle oiling device, a 13-winding forming device, a 14-rotary wire guide, a 15-ceramic disc, a 16-polyurethane floppy disc and a 17-ceramic knife edge disc.
Detailed Description
The invention is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The technological process for warping the untwisted slurry-free polyester warp yarn in the embodiment of the invention comprises the following steps: warp cylinder (creel), shredder, yarn guide roller and warp beam; the warping speed is 1000m/min.
The test method adopted by the invention is as follows:
(1) Breaking strength: testing by adopting a single yarn strong stretching instrument;
(2) Elongation at break: testing by adopting a single yarn strong stretching instrument;
(3) Network degree: adopting a manual network point sampling test;
(4) Abrasion resistance: adopting a wear-resistant tester to test by a flat grinding method;
(5) Hairiness index: sampling and detecting by adopting a microscope;
(6) Dry rub fastness: and testing by adopting a rubbing fastness detector.
Example 1
A preparation method of untwisted slurry-free polyester warp yarn comprises the following steps:
(1) Preparing pre-oriented polyester fiber with the specification of 65dtex/144f, the breaking strength of 3.01cN/dtex and the elongation at break of 121.4 percent as raw materials for standby;
(2) Adopting a BAMAG texturing machine, and preparing untwisted sizing-free polyester warp yarns from the pre-oriented polyester fibers in the step (1) through a texturing process;
as shown in fig. 1, the texturing process flow is as follows: pre-oriented polyester fiber 1- & gt pre-network 2- & gt first yarn feeding roller 3- & gt first deformation hot box 4- & gt cooling plate 5- & gt false twister 6 (false twister A and false twister B in sequence- & gt second yarn feeding roller 7- & gt middle network 8- & gt second shaping hot box 9- & gt shaping yarn feeding roller 10- & gt oiling (oiling through oiling roller 11- & gt DTY winding overfeeding (winding forming through winding forming device 13- & gt untwisting sizing-free polyester warp;
wherein the pre-network air pressure is 0.04MPa; the first variation hot box temperature was 205 ℃; the length of the cooling plate is 1.2m, and the cooling temperature is 28 ℃; as shown in fig. 2, the inlet yarn guides of the false twister a and the false twister B adopt rotary yarn guides 14, the false twister a and the false twister B are friction disc false twisters, the bottom disc is a ceramic knife edge disc 17, the top disc is a ceramic disc 15, the middle disc is a polyurethane floppy disc 16, the hardness of the polyurethane floppy disc is 70shore a, the false twister a is three-axis six discs, the false twister B is three-axis five discs, the twists of the false twister a and the false twister B are 21r/m, the twisting direction of the false twister a is S-twist, and the twisting direction of the false twister B is Z-twist; the second yarn feeding roller speed is 580m/min, and the draft multiple is 1.18; the speed ratio of the false twister A is 1.66, and the speed ratio of the false twister B is 1.7; the air pressure of the medium network is 0.08MPa; the temperature of the second shaping hot box is 150 ℃; overfeeding the shaping yarn feeding roller to be-4.75%; the oiling adopts a nozzle tip oiling mode (namely, adopts a nozzle tip oiling device 12 to oil), and is controlled by an oiling agent pump, wherein the rotating speed of the oiling agent pump is 13r/min; the overfeeding of the DTY winding forming is-3.6 percent.
The specification of the prepared untwisted slurry-free polyester warp yarn is 55dtex/144f, the twist is 0, the breaking strength is 5.36cN/dtex, the elongation at break is 19.64%, the degree of network is 150/m, and the untwisted polyester warp yarn has good network fastness and no fuzzing.
The abrasion resistance of the untwisted slurry-free polyester warp yarn after warping is 31100 times, the hairiness index is 1.83 pieces/m, the breaking strength is 5.3cN/dtex, and the dry friction fastness is 3 grade.
Comparative example 1
A preparation method of terylene sizing warp yarn basically comprises the same steps as in the embodiment 1, wherein in the step 2, a false twister B is not used, an inlet yarn guide of the false twister A adopts an unmodified fixed yarn guide, the oiling mode is contact oiling, the temperature of a first modified hot box is 172 ℃, the temperature of a second shaping hot box is OFF, and the draft multiple is 1.57.
The twist of the prepared 44dtex/144f polyester sizing warp yarn is 22 counts/m, the breaking strength is 3.92cN/dtex, the elongation at break is 19.03%, and the network degree is 150 counts/m;
the abrasive resistance of unglued yarn after warping is 18000 times, the yarn hairiness index is 4.55/m, the breaking strength is 3.77cN/dtex, the dry friction fastness is 1 grade, the physical index is poor, the unglued yarn is directly used for easily breaking warp in the warp weaving process, the weaving efficiency is not achieved, the defective white blank cloth with more broken yarn stopping times has higher defective rate, and the requirement of pulp-free direct weaving is not met;
the abrasion resistance after warping and sizing is 32900 times, the yarn hairiness index is 1.01 per m, the breaking strength is 5.28cN/dtex, and the dry rubbing fastness is 3 grades.
Example 2
A preparation method of untwisted slurry-free polyester warp yarn comprises the following steps:
(1) Preparing pre-oriented polyester fiber with the specification of 120dtex/36f, the breaking strength of 2.69cN/dtex and the elongation at break of 127.5 percent as a raw material for standby;
(2) Adopting a BAMAG texturing machine, and preparing untwisted sizing-free polyester warp yarns from the pre-oriented polyester fibers in the step (1) through a texturing process;
the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns;
wherein the pre-network air pressure is 0.07MPa; the first modified hot box temperature is 197 ℃; the length of the cooling plate is 1.2m, and the cooling temperature is 26 ℃; the inlet yarn guides of the false twister A and the false twister B adopt rotary yarn guides, the false twister A and the false twister B are friction disc type false twisters, the disc at the bottommost layer is a ceramic knife edge disc, the disc at the topmost layer is a ceramic disc, the disc at the middle layer is a polyurethane floppy disc, the hardness of the polyurethane floppy disc is 70Shore A, the false twister A is three-axis six discs, the false twister B is three-axis five discs, the twist of the false twister A and the false twister B are 44r/m, the twist direction of the false twister A is S twist, and the twist direction of the false twister B is Z twist; the second yarn feeding roller speed is 750m/min, and the draft multiple is 1.25; the speed ratio of the false twister A is 1.72, and the speed ratio of the false twister B is 1.75; the air pressure of the medium network is 0.16MPa; the temperature of the second shaping hot box is 172 ℃; overfeeding the shaping yarn feeding roller to be-5.25%; the oiling adopts a nozzle type oiling mode, and is controlled by an oiling agent pump, and the rotating speed of the oiling agent pump is 39r/min; the overfeeding of the DTY winding forming is-4.3 percent.
The specification of the prepared untwisted slurry-free polyester warp yarn is 83dtex/36f, the twist is 0, the breaking strength is 5.31cN/dtex, the elongation at break is 19.29%, the network degree is 110/m, and the untwisted polyester warp yarn has good network fastness and no fuzzing.
The abrasion resistance of the untwisted slurry-free polyester warp yarn after warping is 31800 times, the hairiness index is 0.66 per m, the breaking strength is 5.26cN/dtex, and the dry friction fastness is 4 grades.
Example 3
A preparation method of untwisted slurry-free polyester warp yarn comprises the following steps:
(1) Preparing pre-oriented polyester fiber with the specification of 44dtex/72f, the breaking strength of 3.26cN/dtex and the elongation at break of 114.2 percent as raw materials for standby;
(2) Adopting a BAMAG texturing machine, and preparing untwisted sizing-free polyester warp yarns from the pre-oriented polyester fibers in the step (1) through a texturing process;
the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns;
wherein the pre-network air pressure is 0.05MPa; the first modified hot box temperature is 200 ℃; the length of the cooling plate is 1.2m, and the cooling temperature is 30 ℃; the inlet yarn guides of the false twister A and the false twister B adopt rotary yarn guides, the false twister A and the false twister B are friction disc type false twisters, the disc at the bottommost layer is a ceramic knife edge disc, the disc at the topmost layer is a ceramic disc, the disc at the middle layer is a polyurethane floppy disc, the hardness of the polyurethane floppy disc is 70Shore A, the false twister A is three-axis six discs, the false twister B is three-axis five discs, the twist numbers of the false twister A and the false twister B are 11r/m, the twist direction of the false twister A is S twist, and the twist direction of the false twister B is Z twist; the second yarn feeding roller speed is 650m/min, and the draft multiple is 1.2; the speed ratio of the false twister A is 1.55, and the speed ratio of the false twister B is 1.6; the air pressure of the medium network is 0.12MPa; the temperature of the second shaping hot box is 166 ℃; overfeeding the shaping yarn feeding roller is-4.5%; the oiling adopts a nozzle type oiling mode, and is controlled by an oiling agent pump, and the rotating speed of the oiling agent pump is 12r/min; the overfeeding of the DTY winding forming is-5%.
The specification of the prepared untwisted slurry-free polyester warp yarn is 33dtex/72f, the twist is 0, the breaking strength is 5.41cN/dtex, the elongation at break is 23.79%, the network degree is 150/m, and the untwisted polyester warp yarn has good network fastness and no fuzzing.
The abrasion resistance of the untwisted slurry-free polyester warp yarn after warping is 32300 times, the hairiness index is 1.35 pieces/m, the breaking strength is 5.4cN/dtex, and the dry friction fastness is 4 grades.
Example 4
A preparation method of untwisted slurry-free polyester warp yarn comprises the following steps:
(1) Preparing a pre-oriented polyester fiber with the specification of 22dtex/36f, the breaking strength of 2.88cN/dtex and the elongation at break of 109 percent as a raw material for standby;
(2) Adopting a BAMAG texturing machine, and preparing untwisted sizing-free polyester warp yarns from the pre-oriented polyester fibers in the step (1) through a texturing process;
the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns;
wherein the pre-network air pressure is 0.04MPa; the first modified hot box temperature is 198 ℃; the length of the cooling plate is 1.2m, and the cooling temperature is 32 ℃; the inlet yarn guides of the false twister A and the false twister B adopt rotary yarn guides, the false twister A and the false twister B are friction disc type false twisters, the disc at the bottommost layer is a ceramic knife edge disc, the disc at the topmost layer is a ceramic disc, the disc at the middle layer is a polyurethane floppy disc, the hardness of the polyurethane floppy disc is 70Shore A, the false twister A is three-axis six discs, the false twister B is three-axis five discs, the twist of the false twister A and the false twister B is 9r/m, the twist direction of the false twister A is S twist, and the twist direction of the false twister B is Z twist; the second yarn feeding roller speed is 520m/min, and the draft multiple is 1.20; the speed ratio of the false twister A is 1.6, and the speed ratio of the false twister B is 1.65; the air pressure of the medium network is 0.13MPa; the temperature of the second shaping hot box is 170 ℃; overfeeding the shaping yarn feeding roller to be-4%; the oiling adopts a nozzle type oiling mode, and is controlled by an oiling agent pump, and the rotating speed of the oiling agent pump is 8r/min; the overfeeding of the DTY winding forming is-4.25 percent.
The specification of the prepared untwisted slurry-free polyester warp yarn is 16dtex/36f, the twist is 0, the breaking strength is 5.33cN/dtex, the elongation at break is 22.32%, the degree of network is 155 pieces/m, and the untwisted slurry-free polyester warp yarn has good network fastness and no fuzzing yarn.
The abrasion resistance of the untwisted slurry-free polyester warp yarn after warping is 30900 times, the hairiness index is 0.55/m, the breaking strength is 5.3cN/dtex, and the dry friction fastness is 3 grade.
Example 5
A preparation method of untwisted slurry-free polyester warp yarn comprises the following steps:
(1) Preparing pre-oriented polyester fiber with the specification of 111dtex/288f, the breaking strength of 2.60cN/dtex and the elongation at break of 112.5 percent as a raw material for standby;
(2) Adopting a BAMAG texturing machine, and preparing untwisted sizing-free polyester warp yarns from the pre-oriented polyester fibers in the step (1) through a texturing process;
the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns;
wherein the pre-network air pressure is 0.03MPa; the first modified hot box temperature is 208 ℃; the length of the cooling plate is 1.2m, and the cooling temperature is 26 ℃; the inlet yarn guides of the false twister A and the false twister B adopt rotary yarn guides, the false twister A and the false twister B are friction disc type false twisters, the disc at the bottommost layer is a ceramic knife edge disc, the disc at the topmost layer is a ceramic disc, the disc at the middle layer is a polyurethane floppy disc, the hardness of the polyurethane floppy disc is 70Shore A, the false twister A is three-axis six discs, the false twister B is three-axis five discs, the twist of the false twister A and the false twister B are 42r/m, the twist direction of the false twister A is S twist, and the twist direction of the false twister B is Z twist; the second yarn feeding roller speed is 600m/min, and the draft multiple is 1.22; the speed ratio of the false twister A is 1.72, and the speed ratio of the false twister B is 1.7; the air pressure of the medium network is 0.1MPa; the temperature of the second shaping hot box is 170 ℃; overfeeding the shaping yarn feeding roller to be-4.75%; the oiling is controlled by an oiling agent pump, the rotating speed of the oiling agent pump is 35r/min, and an oil nozzle oiling mode is adopted; the overfeeding of the DTY winding forming is-5%.
The specification of the prepared untwisted slurry-free polyester warp yarn is 83dtex/288f, the twist is 0, the breaking strength is 5.51cN/dtex, the elongation at break is 24.89%, the degree of network is 160/m, and the untwisted polyester warp yarn has good network fastness and no wool.
The abrasion resistance of the untwisted slurry-free polyester warp yarn after warping is 32400 times, the hairiness index is 2.1 pieces/m, the breaking strength is 5.43cN/dtex, and the dry friction fastness is 4 grades.
Example 6
A preparation method of untwisted slurry-free polyester warp yarn comprises the following steps:
(1) Preparing a pre-oriented polyester fiber with the specification of 66dtex/216f, the breaking strength of 2.74cN/dtex and the elongation at break of 106.1 percent as a raw material for standby;
(2) Adopting a BAMAG texturing machine, and preparing untwisted sizing-free polyester warp yarns from the pre-oriented polyester fibers in the step (1) through a texturing process;
the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns;
wherein the pre-network air pressure is 0.04MPa; the first modified hot box temperature is 200 ℃; the length of the cooling plate is 1.2m, and the cooling temperature is 30 ℃; the inlet yarn guides of the false twister A and the false twister B adopt rotary yarn guides, the false twister A and the false twister B are friction disc type false twisters, the disc at the bottommost layer is a ceramic knife edge disc, the disc at the topmost layer is a ceramic disc, the disc at the middle layer is a polyurethane floppy disc, the hardness of the polyurethane floppy disc is 70Shore A, the false twister A is three-axis six discs, the false twister B is three-axis five discs, the twist numbers of the false twister A and the false twister B are 23r/m, the twist direction of the false twister A is S twist, and the twist direction of the false twister B is Z twist; the second yarn feeding roller speed is 500m/min, and the draft multiple is 1.1; the speed ratio of the false twister A is 1.75, and the speed ratio of the twister B is 1.8; the air pressure of the medium network is 0.12MPa; the temperature of the second shaping hot box is 175 ℃; overfeeding the shaping yarn feeding roller to be-4%; the oiling adopts a nozzle type oiling mode, and is controlled by an oiling agent pump, and the rotating speed of the oiling agent pump is 15r/min; the overfeeding of the DTY winding forming is-3.25 percent.
The specification of the prepared untwisted slurry-free polyester warp yarn is 55dtex/216f, the twist is 0, the breaking strength is 5.39cN/dtex, the elongation at break is 24.33%, the degree of network is 160/m, and the untwisted polyester warp yarn has good network fastness and no fuzzing.
The abrasion resistance of the untwisted slurry-free polyester warp yarn after warping is 31800 times, the hairiness index is 2.2 pieces/m, the breaking strength is 5.24cN/dtex, and the dry friction fastness is 3 grades.
Claims (4)
1. A preparation method of untwisted slurry-free polyester warp yarn is characterized by comprising the following steps: the pre-oriented polyester fiber is subjected to an texturing process to prepare untwisted slurry-free polyester warp yarns;
the fineness of the pre-oriented polyester fiber is 22-137 dtex, and the dpf value is 0.306-3.333;
the elasticizing process flow is as follows: pre-oriented polyester fiber, pre-networking, a first yarn feeding roller, a first deformation hot box, a cooling plate, a false twister A, a false twister B, a second yarn feeding roller, a middle networking, a second shaping hot box, a shaping yarn feeding roller, oiling, overfeeding by winding with a DTY (draw textured yarn) to form untwisted sizing-free polyester warp yarns;
the draft multiple is 1.18-1.30, the twist degrees of the false twister A and the false twister B are the same, the twist directions are different, and the inlet yarn guides of the false twister A and the false twister B adopt rotary yarn guides; the twisting direction of the false twister A is S twisting, and the twisting direction of the false twister B is Z twisting;
the false twister A and the false twister B are friction disc type false twisters, the disc at the bottom layer is a ceramic knife edge disc, the disc at the top layer is a ceramic disc, the disc at the middle layer is a polyurethane floppy disc, and the hardness of the polyurethane floppy disc is 70Shore A; the false twister A is a triaxial six-disc and the false twister B is a triaxial five-disc;
the oiling adopts a nozzle type oiling mode;
the twist of the untwisted slurry-free polyester warp yarn is 0, the breaking strength is 5.2-5.6 cN/dtex, the breaking elongation is 22-25%, and the network degree is 110-165 pieces/m; the abrasion resistance of the untwisted slurry-free polyester warp yarn after warping is 30500-33000 times, hairiness index is 0.5-2.3/m, breaking strength is 5.2-5.5 cN/dtex, and dry friction fastness is 3-4 grade.
2. The method for preparing untwisted slurry-free polyester warp yarns according to claim 1, wherein the pretwisted web air pressure is 0.03-0.07 MPa, the temperature of a first modified hot box is 190-210 ℃, the length of a cooling plate is 1.2m, the cooling temperature is 26-32 ℃, the temperature of a second shaping hot box is 150-180 ℃, the speed of a second yarn feeding roller is 450-800 m/min, the speed ratio of a false twister A is 1.5-2.0, the speed ratio of a false twister B is 1.5-2.0, the medium web air pressure is 0.07-0.20 MPa, the overfeeding of a shaping yarn feeding roller is-5.5-3.0%, oiling is controlled by an oiling agent pump, the rotating speed of the oiling agent pump is 5-40 r/min, and the overfeeding of DTY winding forming is-5.0-2.0%.
3. The method for preparing untwisted slurry-free polyester warp yarns according to claim 2, wherein the twist range of the false twister A and the false twister B is 5-45 r/m.
4. The method for preparing untwisted slurry-free polyester warp yarns according to claim 3, wherein the pre-oriented polyester fiber has a breaking strength of 2.5-3.5 cN/dtex and an elongation at break of 105-125%.
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