CN111304759B - Stretching method of polyester industrial yarn - Google Patents
Stretching method of polyester industrial yarn Download PDFInfo
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- CN111304759B CN111304759B CN202010083874.3A CN202010083874A CN111304759B CN 111304759 B CN111304759 B CN 111304759B CN 202010083874 A CN202010083874 A CN 202010083874A CN 111304759 B CN111304759 B CN 111304759B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/02—Heat treatment
Abstract
The invention relates to a drawing method of polyester industrial yarns, which is characterized in that according to the technical route of melt spinning industrial yarns, wet-heat drawing is carried out between a first roller and a second roller, the speed of the second roller is increased, the drawing ratio is increased, and simultaneously, the drawing stress is kept low, so that fibers have the structural characteristics of low crystallinity and high orientation degree. The invention also provides a manufacturing method of the polyester industrial yarn based on the drawing method, after wet and hot drawing, the polyester fiber after extrusion forming and bundling is continuously subjected to hot drawing and heat setting, and the polyester industrial yarn with uniform fiber structure and performance is obtained.
Description
Technical Field
The invention belongs to the technical field of fiber preparation, and relates to a drawing method of polyester industrial yarns, in particular to a drawing method for enabling fibers formed by extrusion of polyester industrial yarns to have the structural characteristics of low crystallinity and high orientation degree, and specifically relates to a method for carrying out wet-hot drawing between a first roller and a second roller.
Background
The high-performance fiber prepared by melt spinning the high-molecular-weight polyester has the advantages of environmental-friendly production process, short process flow, high speed and high efficiency, most of the prepared fibers are used in the fields of rubber framework materials, geotextiles, transmission belts, mooring ropes, canvases, safety belts, safety airbags and the like, are conventionally called industrial yarns, and the strength of the fibers is mostly higher than 7.5 cN/dtex. Compared with other high-performance fibers, the high-performance fibers are not the most outstanding in performance, but are called the most cost-effective high-performance fibers if the production cost is taken into consideration.
However, with the expansion of the application field of the polyester industrial yarn, the requirements of customers are continuously improved, and on the premise of meeting basic mechanical properties, some application fields require higher wear resistance and use stability, which actually require higher uniformity of the industrial yarn, and the uniformity is not limited to the linear density unevenness, the strong stretching unevenness, the thermal shrinkage unevenness and the evenness unevenness of the yarn bundle, but also must improve the uniformity of each yarn in the yarn bundle, the radial uniformity of a single yarn, and even the microstructure uniformity on the micrometer and submicron scale.
In order to achieve the above-mentioned goal, the existing production technology adopts many improvement measures from the aspects of improving the melt uniformity, controlling the uniformity of melt preparation and conveying design, spinneret orifice distribution and structure optimization, cooling forming and hot stretching, heat setting equipment and process, etc., and reduces the linear density, strong stretching and yarn evenness; however, in the case of the melt-spun industrial yarn, the number of the bundle filaments is relatively large, and the diameter of the single filament is large, so that the uniformity of the microstructure is hardly improved by the above measures. To this end, researchers have begun to try new process technology routes to overcome the problems of microstructural non-uniformities caused by air cooling and dry heat stretching. The data show that in the spinning forming process, the liquid bath (LIB) is added, the fiber with uniform radial direction and high molecular chain orientation degree can be obtained, and the PET and PEN industrial yarn with high strength and high modulus can be obtained through the subsequent hot stretching and heat setting with lower times. In addition, there is also disclosed a technical method in which, on the FDY equipment, water having a specific composition is added to the fibers by a nozzle to the fibers after forming, and a first hot roll is replaced by a group of ceramic rods to adjust the tension, and is drawn at normal temperature, which is called a water film drawing process, and is heat-set on a second hot roll, so that the tension in the drawing process is uniform and stable, broken ends of broken filaments are not easily generated, and uniform dyeing of the fibers is obtained.
The advance of the above technology in improving the microstructure uniformity of the fiber is obvious, but the above technology is difficult to be widely popularized, and the fundamental reason is that: 1) the water bath is added before the fiber is solidified, so that the spinning stress is greatly increased, the orientation degree of the fiber is improved, and as the temperature, the stress, the speed and the like of a strand silk before solidification along the spinning are changed and present continuous gradient change, namely the stage is a non-isothermal process, researchers also indicate that the position, the length, the temperature and the like of the water bath on the spinning can influence the structure and the performance of the fiber, so that too much uncertainty is brought to the reasonable control of the actual production. 2) The FDY water film drawing process is to carry out water film drawing on fibers with high orientation, the aim is to improve the dyeing uniformity of civil silk, special requirements are made on the composition of a water film, an auxiliary agent needs to be added to improve the water content of the fibers to achieve the aim of normal-temperature drawing, the introduction of the auxiliary agent not only increases the raw material cost, but also considers the treatment problem of the auxiliary agent in the production and post-processing processes, and unnecessary secondary pollution is caused.
Disclosure of Invention
In order to overcome the limitations of the prior art, the invention aims to provide a drawing method of polyester industrial yarns, which performs wet-heat drawing between a first roller and a second roller according to the technical route of melt spinning industrial yarns, increases the speed of the second roller, increases the drawing ratio of the section, and keeps lower drawing stress, so that the fibers have the structural characteristics of low crystallinity and high orientation degree.
The present invention also provides a method for producing a polyester industrial yarn based on the above drawing method, wherein the polyester fiber after extrusion molding and bundling is subjected to wet heat drawing, and then is subjected to heat drawing and heat setting to obtain a polyester industrial yarn having a uniform fiber structure and properties.
In the existing polyester industrial yarn production technology, after extrusion, drawing, cooling and forming, air is filled between a first roller (about 65 ℃) and a second roller (about 95 ℃), when the air reaches the second roller, the temperature rises above the glass transition temperature of polyester, preparation is made for subsequent multistage multiple drawing, which can be called pre-drawing, the drawing multiplying power is about 1.05 times generally, and the drawing multiplying power is limited by the low crystallization and low orientation of yarn strips, and the temperature of the two rollers and the drawing multiplying power can only be limited in a narrow range, and the problem is that: firstly, air and polyester heat conductivity coefficient are little itself, lead to the fibre to be heated unevenly easily, secondly cause the orientation of separating of partial molecular chain section easily if the hot roller high temperature or multiplying power undersize, thirdly if the hot roller low temperature or multiplying power too big cause the fibre local stretching inhomogeneous easily, and neither does not do benefit to going on smoothly of follow-up hot stretching, can lead to the uneven rate of final fibre to increase even. Carry out damp and hot drawing between first and second roller, utilize the steam that coefficient of heat conductivity is big, improve fibrous uniformity of being heated, all improve with the radial temperature uniformity of single fibre between the fibre, avoid the low high stress problem that causes of local temperature, solve tensile inhomogeneous problem, increase this section drawing rate simultaneously, prevent to solve the emergence of orientation, can obtain the fibre of low crystallinity, high orientation degree, do benefit to follow-up hot drawing.
The invention relates to a stretching method of polyester industrial yarns, which comprises the following steps of stretching polyester fibers subjected to wet heat stretching, extrusion molding and bundling, and performing wet heat stretching between a first roller and a second roller, wherein the specific conditions are as follows: the humidity is 100%, and the temperature is 80-98 ℃; after the wet and hot stretching, the crystallinity of the fiber is 0-5%, the birefringence is 0.04-0.08, and the trans-conformation content of an amorphous region is 40-75%, the birefringence reflects the overall situation that the sub-chain segments of the polyester fiber crystal region and the amorphous region are arranged along the axial direction of the fiber, the trans-conformation of the amorphous region reflects the straightening situation of the molecular chain segments of the amorphous region of the fiber, the crystallinity is not high, the trans-conformation content of the amorphous region is higher, the arrangement uniformity degree of the molecular chain segments in the fiber is high, the defects are few, and the preparation of the highly uniform fiber after the subsequent hot stretching and heat setting is facilitated.
As a preferred technical scheme:
the drawing method of the polyester industrial yarn has the polyester intrinsic viscosity of 0.9-1.2 dL/g.
The stretching method of the polyester industrial yarn as described above, wherein the wet and hot stretching ratio: 1.1-3.5 times. Under the condition of low temperature, adopting low stretching multiple, and under the condition of high temperature, adopting high stretching multiple; when the stretch ratio is too small, the birefringence and the trans-conformation content of the amorphous region are reduced, and when the stretch ratio is too large, the crystallinity is greatly increased.
A process for drawing a polyester industrial yarn as described above, said wet-heat drawing being carried out between a first roll and a second roll: the speed of the first roller is 500-2000 m/min, the temperature is 60-75 ℃, the speed of the second roller is 550-2500 m/min, and the temperature is 90-120 ℃. A low temperature corresponds to a low speed and a high temperature corresponds to a high speed in order to control the stress during the wet-hot drawing of the fibers.
According to the stretching method of the polyester industrial yarn, the length of the wet and hot stretching section is 0.4-0.8 m. The length is set to correspond to the speed and the temperature, and when the speed is low and the temperature is low, the length is longer.
The manufacturing method of the polyester industrial yarn comprises the following steps: the wet and hot stretched fiber is continuously subjected to hot stretching and hot setting, and the setting of the subsequent hot stretching stage can adopt two modes, wherein the existing two-stage hot stretching or the improvement of the two-stage hot stretching to the one-stage hot stretching is adopted to obtain the polyester industrial yarn, the filament number of the obtained polyester industrial yarn is 2.2-9.6 dtex, the breaking strength is 8.0-8.8 cN/dtex, the breaking elongation is 10-24%, the breaking strength irregularity is less than or equal to 3%, and the breaking elongation irregularity is less than or equal to 5%.
In the method for producing the polyester industrial yarn, the hot drawing magnification is 1.4 to 5.5 times, and the hot drawing temperature is 135 to 195 ℃.
The conditions for heat setting in the method for producing the polyester industrial yarn described above are as follows: the temperature is 150-165 ℃.
Has the advantages that:
(1) according to the drawing method of the polyester industrial yarn, the low-crystallization and high-orientation fiber is obtained before the subsequent hot drawing, and is used for preparing the high-performance polyester industrial yarn; the drawing process of the present invention is feasible.
(2) The manufacturing method of the polyester industrial yarn has unique process, and the manufactured polyester industrial yarn has high breaking strength, small unevenness of the breaking strength and low unevenness of the elongation at break.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
A polyester industrial yarn drawing method comprises the steps of extruding polyester with the intrinsic viscosity of 1.05dL/g through a spinning assembly at 305 ℃, wherein the extrusion speed is 3m/min, the first roller speed is 500m/min, the temperature is 70 ℃, and carrying out damp-heat drawing between a first roller and a second roller, wherein the damp-heat drawing conditions are as follows: the relative humidity of the environment is 100 percent, the temperature of the environment is 90 ℃, the speed of the second roller is 850m/min, the temperature is 90 ℃, the crystallinity of the obtained polyester fiber is 2 percent, the birefringence is 0.05, and the trans-form conformation content of the amorphous region is 60 percent.
Comparative example 1
A polyester industrial yarn drawing method is characterized in that polyester with the intrinsic viscosity of 1.05dL/g is extruded out through a spinning assembly at the temperature of 300 ℃, the extrusion speed is 3m/min, the first roller speed is 500m/min, the temperature is 70 ℃, the second roller speed is 525m/min, the temperature is 95 ℃, the crystallinity of fibers is 8%, the birefringence is 0.02, and the trans-conformation content of an amorphous region is 20%.
Example 2
A polyester industrial yarn manufacturing method comprises the steps of extruding polyester with the intrinsic viscosity of 0.9dL/g through a spinning assembly at 295 ℃, wherein the extrusion rate is 3.2m/min, the first roller speed is 500m/min, the temperature is 60 ℃, the second roller speed is 550m/min, the temperature is 90 ℃, and wet-heat stretching is carried out between the first roller and the second roller, and the wet-heat stretching conditions are as follows: ambient relative humidity 100%, ambient temperature 80 ℃, when the crystallinity of the fiber is 0%, the birefringence is 0.04, the trans-conformation content of the amorphous region is 40%, followed by hot stretching by a third hot roll, hot stretching by a fourth hot roll, heat setting by a fifth hot roll: the hot stretching conditions are that the temperature of the third hot roller is 135 ℃, the speed of the third hot roller is 2300m/min, the temperature of the fourth hot roller is 190 ℃, and the speed of the fourth hot roller is 3200 m/min; the heat setting conditions are as follows: the temperature of the fifth hot roll was 165 ℃ and the speed of the fifth hot roll was 3150m/min, and the obtained polyester fiber had a single-filament fineness of 2.2dtex, a breaking strength of 8.0cN/dtex, an elongation at break of 24%, a breaking strength irregularity of 1.5%, and an elongation at break irregularity of 3%.
Comparative example 2
A method for manufacturing polyester industrial yarn is to extrude polyester with the intrinsic viscosity of 0.9dL/g through a spinning component at 295 ℃, wherein the extrusion rate is 3.2m/min, the first roller speed is 500m/min, the temperature is 60 ℃, the second roller speed is 525m/min, the temperature is 95 ℃, and the crystallinity is 3%, the birefringence is 0.016, and the trans-form conformation content of an amorphous region is 18%. Then, carrying out hot stretching through a third hot roller and a fourth hot roller, and carrying out heat setting through a fifth hot roller: the hot stretching conditions are that the temperature of the third hot roller is 130 ℃, the speed of the third hot roller is 2200m/min, the temperature of the fourth hot roller is 230 ℃, and the speed of the fourth hot roller is 3200 m/min; the heat setting conditions are as follows: the temperature of the fifth hot roll was 150 ℃ and the speed of the fifth hot roll was 3150m/min, and the obtained polyester fiber had a breaking strength of 7.6cN/dtex, an elongation at break of 14%, a variation in breaking strength of 5.5%, and a variation in elongation at break of 7.5%.
Example 3
A polyester industrial yarn manufacturing method comprises the steps of extruding polyester with the intrinsic viscosity of 1.2dL/g through a spinning assembly at 315 ℃, wherein the extrusion rate is 9.5m/min, the first roller speed is 2200m/min, the temperature is 75 ℃, the second roller speed is 2200m/min, the temperature is 120 ℃, and wet-heat stretching is carried out between the first roller and the second roller, and the wet-heat stretching conditions are as follows: ambient relative humidity 100%, ambient temperature 98 ℃, at which point the crystallinity of the fiber is 5%, the birefringence is 0.08, the trans-conformation content of the amorphous region is 75%, followed by hot stretching by a third hot roll, heat setting by a fourth hot roll: the hot stretching conditions are that the temperature of the third hot roller is 195 ℃ and the speed of the third hot roller is 3080 m/min; the heat setting conditions are as follows: the temperature of the fourth hot roll is 160 ℃, the speed of the fourth hot roll is 3000m/min, and the obtained polyester fiber has the breaking strength of 8.8cN/dtex, the elongation at break of 10 percent, the irregularity of the breaking strength of 3 percent and the irregularity of the breaking elongation of 5 percent.
Comparative example 3
A method for manufacturing polyester industrial yarns comprises the steps of extruding polyester with the intrinsic viscosity of 1.2dL/g through a spinning assembly at 315 ℃, wherein the extrusion rate is 9.5m/min, the first roller speed is 2200m/min, the temperature is 75 ℃, the second roller speed is 2300m/min, the temperature is 105 ℃, and the crystallinity is 12%, the birefringence is 0.035%, and the trans-form content of an amorphous region is 32%. Then, carrying out hot stretching through a third hot roller and a fourth hot roller, and carrying out heat setting through a fifth hot roller: the hot stretching conditions are that the temperature of the third hot roller is 140 ℃, the speed of the third hot roller is 2500m/min, the temperature of the fourth hot roller is 230 ℃, and the speed of the fourth hot roller is 3200 m/min; the heat setting conditions are as follows: the temperature of the fifth hot roll is 160 ℃, the speed of the fifth hot roll is 3150m/min, the breaking strength of the obtained polyester fiber is 8.4cN/dtex, the elongation at break is 15%, the irregularity of the breaking strength is 3.8%, and the irregularity of the elongation at break is 7.2%.
As can be seen from comparative examples 2 and 3, since the molecular segments of the fibers formed before the third roll are oriented to a low degree without being subjected to the wet heat drawing, the temperature of the third roll cannot be increased, and therefore, it is inconsistent with the process conditions of examples 2 and 3, and the strength and the elongation unevenness of the finally obtained polyester industrial yarn are high.
Example 4
A polyester industrial yarn drawing method is to extrude and bundle polyester with the intrinsic viscosity of 0.95dL/g, and carry out damp and hot drawing with the multiplying power of 1.1 times between a first roller and a second roller, wherein the length of the damp and hot drawing section is 0.4 meter, and the specific conditions are as follows: the humidity is 100%, the ambient temperature is 85 ℃, the speed of a first roller is 550m/min, the temperature of the first roller is 70 ℃, the speed of a second roller is 900m/min, and the temperature of the second roller is 95 ℃; after the wet and hot stretching, the crystallinity of the fiber is 2.5 percent, the birefringence is 0.06 percent and the trans-form conformation content of the amorphous region is 60 percent;
the fiber after the wet heat stretching was subjected to heat stretching with a total magnification of 1.45 times (the heat stretching was carried out in two stages: the first stage heat stretching temperature was 150 ℃, the stretching magnification was 1.2 times, and the second stage heat stretching temperature was 165 ℃) and heat setting at 155 ℃ were continued to obtain a polyester industrial yarn having a single-filament fineness of 2.5dtex, a breaking strength of 8.2cN/dtex, an elongation at break of 15%, a strength irregularity at break of 2.6%, and an elongation at break irregularity of 4.6%.
Example 5
A polyester industrial yarn drawing method is to extrude and bundle polyester with the intrinsic viscosity of 0.9dL/g, and carry out damp and hot drawing with the multiplying power of 1.8 times between a first roller and a second roller, wherein the length of the damp and hot drawing section is 0.5 meter, and the specific conditions are as follows: the humidity is 100%, the ambient temperature is 80 ℃, the speed of a first roller is 500m/min, the temperature of the first roller is 60 ℃, the speed of a second roller is 600m/min, and the temperature of the second roller is 90 ℃; after the wet heat stretching, the crystallinity of the fiber is 0.5 percent, the birefringence is 0.05 percent, and the trans-conformation content of the amorphous region is 45 percent;
the fiber after the wet heat stretching is continuously subjected to heat setting with the total magnification of 2.5 times (the heat stretching is divided into two stages, the first stage heat stretching temperature is 135 ℃, the stretching magnification is 1.2 times, the second stage heat stretching temperature is 140 ℃) and the temperature is 150 ℃, and the obtained polyester industrial yarn has the filament number of 2.2dtex, the breaking strength of 8cN/dtex, the breaking elongation of 24%, the breaking strength irregularity of 3% and the breaking elongation irregularity of 3%.
Example 6
A polyester industrial yarn drawing method is to extrude and bundle polyester with the intrinsic viscosity of 1.2dL/g, and carry out damp and hot drawing with the multiplying power of 2.5 times between a first roller and a second roller, wherein the length of the damp and hot drawing section is 0.8 meter, and the specific conditions are as follows: the humidity is 100%, the ambient temperature is 98 ℃, the speed of the first roller is 2000m/min, the temperature of the first roller is 75 ℃, the speed of the second roller is 2200m/min, and the temperature of the second roller is 120 ℃; after the wet heat stretching, the crystallinity of the fiber is 3 percent, the birefringence index is 0.07, and the trans conformation content of the amorphous region is 75 percent;
the fiber after the wet heat stretching was subjected to heat stretching with a total magnification of 5.5 times (the heat stretching was carried out in two stages: the first stage heat stretching temperature was 160 ℃, the stretching magnification was 3.4 times, and the second stage heat stretching temperature was 195 ℃) and heat setting at 160 ℃ to obtain a polyester industrial yarn having a single-filament fineness of 9.6dtex, a breaking strength of 8.6cN/dtex, an elongation at break of 13%, a strength irregularity at break of 1.8%, and an elongation at break irregularity of 4.5%.
Example 7
A polyester industrial yarn drawing method is to extrude and bundle polyester with the intrinsic viscosity of 1.05dL/g, and carry out the wet and hot drawing with the multiplying power of 3.0 times between a first roller and a second roller, wherein the length of the wet and hot drawing section is 0.8 meter, and the specific conditions are as follows: the humidity is 100%, the ambient temperature is 90 ℃, the speed of the first roller is 2000m/min, the temperature of the first roller is 75 ℃, the speed of the second roller is 2500m/min, and the temperature of the second roller is 120 ℃; after the wet heat stretching, the crystallinity of the fiber is 5 percent, the birefringence index is 0.08, and the trans-conformation content of the amorphous region is 70 percent;
the fiber after the wet heat stretching was continuously subjected to heat stretching with a total magnification of 3.5 times (the heat stretching was carried out in two stages: the first stage heat stretching temperature was 140 ℃, the stretching magnification was 2.9 times, and the second stage heat stretching temperature was 155 ℃) and heat setting at 158 ℃ to obtain a polyester industrial yarn having a single-filament fineness of 5.5dtex, a breaking strength of 8.5cN/dtex, an elongation at break of 15%, a strength irregularity at break of 2.2%, and an elongation irregularity at break of 3.8%.
Example 8
A polyester industrial yarn drawing method is to extrude and bundle polyester with the intrinsic viscosity of 1.15dL/g, and carry out the wet and hot drawing with the multiplying power of 3.5 times between a first roller and a second roller, wherein the length of the wet and hot drawing section is 0.6 meter, and the specific conditions are as follows: the humidity is 100%, the ambient temperature is 95 ℃, the speed of a first roller is 1000m/min, the temperature of the first roller is 65 ℃, the speed of a second roller is 1500m/min, and the temperature of the second roller is 110 ℃; after the wet heat stretching, the crystallinity of the fiber is 4 percent, the birefringence index is 0.05, and the trans conformation content of the amorphous region is 55 percent;
the fiber after the wet heat stretching is continuously subjected to heat stretching with the total magnification of 4.2 times (the heat stretching is divided into two stages, the first stage heat stretching temperature is 165 ℃, the stretching magnification is 3.0 times, the second stage heat stretching temperature is 180 ℃) and heat setting with the temperature of 160 ℃ is carried out, and the obtained polyester industrial yarn has the filament number of 8.5dtex, the breaking strength of 8.8cN/dtex, the elongation at break of 10%, the irregularity in breaking strength of 2.5% and the irregularity in breaking elongation of 4.1%.
Claims (4)
1. A drawing method of polyester industrial yarn is characterized in that: carrying out wet-hot stretching on the extruded and bundled polyester fibers between a first roller and a second roller, wherein the specific conditions are as follows: the humidity is 100%, the temperature is 80-98 ℃, and the stretching ratio is 1.1-3.5 times; the length of the wet and hot stretching section is 0.4-0.8 m; the wet heat stretching is performed between a first roller and a second roller: the speed of the first roller is 500-2200 m/min, the temperature of the first roller is 60-75 ℃, the speed of the second roller is 550-2500 m/min, and the temperature of the second roller is 90-120 ℃; after the wet and hot stretching, the crystallinity of the fiber is 0-5%, the birefringence is 0.04-0.08, and the trans-form conformation content of the amorphous region is 40-75%; and (3) continuously carrying out hot stretching and hot setting on the fiber subjected to the wet-hot stretching to obtain the polyester industrial yarn, wherein the filament number of the obtained polyester industrial yarn is 2.2-9.6 dtex, the breaking strength is 8.0-8.8 cN/dtex, the elongation at break is 10-24%, the non-uniformity of the breaking strength is less than or equal to 3%, and the non-uniformity of the elongation at break is less than or equal to 5%.
2. The process of claim 1, wherein the intrinsic viscosity of the polyester is 0.9 to 1.2 dL/g.
3. The method for drawing the industrial polyester yarn according to claim 1, wherein the hot drawing ratio is 1.4 to 5.5 times, and the hot drawing temperature is 135 to 195 ℃.
4. The drawing method of polyester industrial yarn according to claim 1, wherein the conditions of said heat-setting are: the temperature is 150-165 ℃.
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| 纺丝工艺对并列复合聚酯纤维性能的影响;李明明等;《纺织学报》;20191231;第40卷(第12期);第16-20页 * |
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| CN111304759A (en) | 2020-06-19 |
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