CN117867683A - High-strength PA6 industrial yarn and structure process coupling regulation preparation method thereof - Google Patents
High-strength PA6 industrial yarn and structure process coupling regulation preparation method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000008569 process Effects 0.000 title claims abstract description 30
- 238000010168 coupling process Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000008878 coupling Effects 0.000 title claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 17
- 239000000835 fiber Substances 0.000 claims abstract description 64
- 230000001276 controlling effect Effects 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 229920006240 drawn fiber Polymers 0.000 claims description 34
- 238000009987 spinning Methods 0.000 claims description 9
- 238000009998 heat setting Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000012681 fiber drawing Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 3
- 229920002292 Nylon 6 Polymers 0.000 description 33
- 230000000052 comparative effect Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 3
- 229920006351 engineering plastic Polymers 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
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Abstract
The invention discloses a high-strength PA6 industrial yarn and a preparation method for coupling regulation of a structural process thereof, wherein the temperature and the draft multiplying power of a draft roller are regulated and controlled through crystallinity. The crystallinity and the grain size are main determinants for determining the molecular chain along a drawing stress curve, the fiber drawing temperature and multiplying power can be decoupled through controlling the fiber crystallinity, the process conditions are controlled more accurately, and the multi-factor decoupling research method is adopted to carry out joint regulation and control on processes such as first-stage, second-stage and third-stage drawing multiplying power, drawing temperature and the like and all-stage fiber structures, so as to obtain the optimal value of the processes; the PA industrial yarn prepared by the preparation method has the advantages of monofilament linear density of 6-10dtex, breaking strength of 8.0-10.0cN/dtex, elongation of 20+/-5 percent and better performance.
Description
Technical Field
The invention relates to the technical field of PA6 industrial yarns, in particular to a high-strength PA6 industrial yarn and a structural process coupling regulation preparation method thereof.
Background
Polyamide 6 (Polyamide 6) is PA6 for short, is a linear semi-crystalline aliphatic thermoplastic engineering plastic, and has the advantages of light weight, high strength, abrasion resistance, fatigue resistance, weak acid and weak base resistance, some organic solvents, corrosion resistance and the like. The PA6 is easy to mold and process, and engineering plastics, films, fibers and the like can be prepared through processes such as injection molding, blow molding, extrusion, film pressure, melt spinning and the like, so that the PA6 can be used as a reinforcing material, plastic steel, copper and other metals can be replaced, and can be blended with other fibers to prepare cords, conveyor belts, parachutes and the like with high wear resistance, and has wide application in the fields of textile clothing, industrial textiles, national defense and military industry and the like.
The PA6 industrial yarn is one of main raw materials of the tire cord, the strength of the PA6 industrial yarn directly influences the wear resistance and the service life of the tire, and the improvement of the breaking strength of the PA6 fiber is a main direction of the development of the industrial yarn. In the prior art, because of the mutual influence of the temperature such as the drawing multiplying power, the drawing temperature, the shaping temperature and the like and the fiber structure in the multi-stage drawing process of the industrial yarn, the condensed state structure and the mechanical property of the fiber are difficult to adjust and control by a single factor. In addition, the conventional method controls the drafting temperature and the drafting multiplying power range, controls the mechanical property of the fiber through experience, and can only judge the process quality through the mechanical property of the final fiber. However, the drawing temperature and the drawing multiplying power have coupling influence on the condensed structure and mechanical property of the fiber, are not in a linear increasing relation with the mechanical property, are mainly influenced by the crystallinity of the fiber, can only obtain the extreme value of the fiber strength, and cannot obtain the optimal value.
Disclosure of Invention
Based on the method, the invention provides a high-strength PA6 industrial yarn and a structure process coupling regulation preparation method thereof, so as to solve the problem that the PA6 industrial yarn in the prior art is difficult to regulate and control the condensed state structure and mechanical property of the fiber through a single factor.
A preparation method for coupling regulation of a high-strength PA6 industrial yarn structure process comprises the following steps:
s1: quantitatively and uniformly extruding the PA6 melt from micropores of a spinneret plate, wherein the spinning temperature is 275-285 ℃, so as to obtain PA6 nascent fibers;
s2: the method comprises the steps of feeding PA6 primary fibers into a primary drawing roller through a roller, adjusting the drawing temperature of the primary drawing roller and the drawing multiplying power between the primary drawing roller and a secondary drawing roller to obtain primary drawn fibers, and controlling the crystallinity of the fibers through a enthalpy value method;
s3: carrying out secondary drawing on the primary drawn fiber, and controlling the temperature of a secondary drawing roller, the drawing multiplying power of the secondary drawing roller and the drawing multiplying power of a tertiary drawing roller according to the crystallinity of the primary drawn fiber to obtain the secondary drawn fiber;
s4: performing tertiary drawing on the secondary drawing fiber, and controlling the temperature of a tertiary drawing roller, the drawing multiplying power of the tertiary drawing roller and the drawing multiplying power of a quaternary drawing roller according to the crystallinity of the secondary drawing fiber to obtain the tertiary drawing fiber;
s5: and (3) carrying out heat setting on the three-stage drawn fiber, regulating the temperature of a four-stage drawing roller according to the crystallinity of the three-stage drawn fiber, controlling setting pressure through the speed difference between the four-stage drawing roller and a five-stage drawing roller, and finally winding to prepare the high-strength PA6 industrial yarn.
Preferably, in the step S1, the post-drawing multiplying power is regulated and controlled by controlling the diameter of the micropore of the spinneret plate to be 0.3-0.5mm and regulating the spinneret drawing ratio of the fiber.
Preferably, in the step S2, the primary drafting temperature is 60-75 ℃, and the primary drafting temperature is adjusted according to the linear density of the monofilaments; the primary draft ratio is 2.5-3.6 times, and the crystallinity of the primary draft fiber is controlled to be 15-25%.
Preferably, in step S2, the enthalpy value method is a method for measuring the crystallinity of the fiber by using a differential scanning calorimeter DSC, specifically, sampling on line and then performing DSC measurement to obtain the crystallinity of the fiber.
Preferably, in step S3, the second-stage drawing temperature is 140-170 ℃, the second-stage drawing temperature and the drawing multiplying power are adjusted according to the crystallinity of the first-stage drawn fiber, and when the crystallinity of the first-stage drawn fiber is less than 15%, the drawing temperature is reduced to 140 ℃; when the crystallinity of the primary drawn fiber is 15-20%, the drawing temperature is 141-150 ℃; when the crystallinity of the primary drawn fiber is more than 20%, the drawing temperature is 151-160 ℃; the secondary draft ratio is 1.3-1.5 times, and the secondary draft fiber with the crystallinity of 25-30% is prepared.
Preferably, in the step S4, the third-stage drawing temperature is 160-200 ℃, and the third-stage drawing temperature is controlled according to the crystallinity of the second-stage drawn fiber; when the crystallinity is less than 25%, the three-stage drawing temperature is 160 ℃; when the crystallinity is 25-28%, the three-stage drafting temperature is 160-180 ℃; when the crystallinity is more than 28%, the three-stage drafting temperature is 180-200 ℃; three-stage drawing fiber with crystallinity of 30-35% is prepared with three-stage drawing ratio of 1.05-1.20.
Preferably, in the step S5, the heat setting temperature is 215 ℃, the speed difference between the four-level drawing roller and the five-level drawing roller is +/-5%, and the tension is controlled; when the crystallinity of the three-stage drawn fiber is less than 30%, the speed difference is 3-5%; when the crystallinity is 30-32%, the speed difference is 0-3%; when the crystallinity is more than 32%, the speed difference is-5% to 0%.
Preferably, the spinning temperature is 275-285 ℃, and is adjusted according to the linear density of the fiber monofilaments, and the higher the linear density is, the higher the spinning temperature is.
The monofilament linear density of the high-strength PA6 industrial yarn is 6-10dtex, the breaking strength is 8.0-10.0cN/dtex, and the elongation is 20+/-5%.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
1. in the prior art, the condensed state structure and mechanical property of the fiber are difficult to adjust and control by a single factor, and are mainly influenced by the crystallinity of the fiber, and only the extremum of the fiber strength can be obtained, but the optimal value cannot be obtained; the invention can decouple the fiber drawing temperature and multiplying power by controlling the fiber crystallinity, more precisely control the process conditions, and jointly regulate and control the processes of the first, second, third-level drawing multiplying power, drawing temperature and the like and the fiber structures of all levels by adopting a multi-factor decoupling research method to obtain the optimal value of the process;
2. the PA6 industrial yarn prepared by the prior art has the linear density of 4-7 dtex, the breaking strength of 7.0-9.0 cN/dtex and the elongation of 23+/-5%; the test result shows that the monofilament linear density of the PA6 industrial yarn is 6-10dtex, the breaking strength is 8.0-10.0cN/dtex, the elongation is 20+/-5%, and the performance is better.
Drawings
FIG. 1 is a physical diagram of a high-strength PA6 industrial yarn prepared by an embodiment of the invention;
FIG. 2 is a graph showing the mechanical properties of the high-strength PA6 industrial yarn prepared in the comparative example of the present invention;
FIG. 3 is a comparative chart showing DSC test results of high-strength PA6 industrial filaments prepared in comparative examples and examples of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 3, the invention provides a high-strength PA6 industrial yarn and a structural process coupling regulation preparation method thereof, which specifically comprise the following steps:
a preparation method for coupling regulation of a high-strength PA6 industrial yarn structure process comprises the following steps:
s1: quantitatively and uniformly extruding the PA6 melt from micropores of a spinneret plate, wherein the spinning temperature is 275-285 ℃, so as to obtain PA6 nascent fibers;
s2: the method comprises the steps of feeding PA6 primary fibers into a primary drawing roller through a roller, adjusting the drawing temperature of the primary drawing roller and the drawing multiplying power between the primary drawing roller and a secondary drawing roller to obtain primary drawn fibers, and controlling the crystallinity of the fibers through a enthalpy value method;
s3: carrying out secondary drawing on the primary drawn fiber, and controlling the temperature of a secondary drawing roller, the drawing multiplying power of the secondary drawing roller and the drawing multiplying power of a tertiary drawing roller according to the crystallinity of the primary drawn fiber to obtain the secondary drawn fiber;
s4: performing tertiary drawing on the secondary drawing fiber, and controlling the temperature of a tertiary drawing roller, the drawing multiplying power of the tertiary drawing roller and the drawing multiplying power of a quaternary drawing roller according to the crystallinity of the secondary drawing fiber to obtain the tertiary drawing fiber;
s5: and (3) carrying out heat setting on the three-stage drawn fiber, regulating the temperature of a four-stage drawing roller according to the crystallinity of the three-stage drawn fiber, controlling setting pressure through the speed difference between the four-stage drawing roller and a five-stage drawing roller, and finally winding to prepare the high-strength PA6 industrial yarn.
Further, in the step S1, the post-drawing multiplying power is regulated and controlled by controlling the diameter of the micropore of the spinneret plate to be 0.3-0.5mm and regulating the spinneret drawing ratio of the fiber.
Further, in the step S2, the primary drafting temperature is 60-75 ℃, the adjustment is carried out according to the linear density of the single filaments, and the larger the linear density of the single filaments is, the higher the primary drafting temperature is; the primary draft ratio is 2.5-3.6 times, and the crystallinity of the primary draft fiber is controlled to be 15-25%.
Further, in step S2, the enthalpy value method is a method for measuring the crystallinity of the fiber by using a differential scanning calorimeter DSC, specifically, sampling on line and then performing DSC measurement to obtain the crystallinity of the fiber.
Further, in the step S3, the secondary drawing temperature is 140-170 ℃, the secondary drawing temperature and the drawing multiplying power are adjusted according to the crystallinity of the primary drawing fiber, and when the crystallinity of the primary drawing fiber is less than 15%, the drawing temperature is reduced to 140 ℃; when the crystallinity of the primary drawn fiber is 15-20%, the drawing temperature is 141-150 ℃; when the crystallinity of the primary drawn fiber is more than 20%, the drawing temperature is 151-160 ℃; the secondary draft ratio is 1.3-1.5 times, and the secondary draft fiber with the crystallinity of 25-30% is prepared.
Further, in the step S4, the third-stage drawing temperature is 160-200 ℃, and the third-stage drawing temperature is controlled according to the crystallinity of the second-stage drawn fiber; when the crystallinity is less than 25%, the three-stage drawing temperature is 160 ℃; when the crystallinity is 25-28%, the three-stage drafting temperature is 160-180 ℃; when the crystallinity is more than 28%, the three-stage drafting temperature is 180-200 ℃; three-stage drawing fiber with crystallinity of 30-35% is prepared with three-stage drawing ratio of 1.05-1.20.
Further, in step S5, the heat setting temperature is 215 ℃, the speed difference between the four-stage drawing roller and the five-stage drawing roller is ±5%, and the tension is controlled; when the crystallinity of the three-stage drawn fiber is less than 30%, the speed difference is 3-5%; when the crystallinity is 30-32%, the speed difference is 0-3%; when the crystallinity is more than 32%, the speed difference is-5% to 0%.
Further, the spinning temperature is 275-285 ℃, and the spinning temperature is higher as the linear density of the fiber monofilaments is higher.
The invention can decouple the fiber drawing temperature and multiplying power through the control of the fiber crystallinity, more precisely control the process conditions, and adopts a multi-factor decoupling research method to jointly regulate and control the processes of the first, second, third drawing multiplying power, drawing temperature and the like and the fiber structures of all levels to obtain the optimal value of the process; the test result of the PA industrial yarn prepared by the preparation method shows that the PA industrial yarn has the advantages of monofilament linear density of 6-10dtex, breaking strength of 8.0-10.0cN/dtex, elongation of 20+/-5 percent and better performance.
In order to enable those skilled in the art to better understand and realize the technical solutions of the present invention, examples 1-4 and comparative example 1 are presented using the above preparation methods and the corresponding process parameters provided in table 1.
Table 1 process parameter tables of examples 1-4 and comparative example 1
| Example 1 | Example 2 | Example 3 | Examples4 | Comparative example 1 | |
| Crystallinity of first-stage drawn fiber (%) | 19.0 | 18.9 | 21.5 | 21.7 | 15.2 |
| Crystallinity of second-stage drawn fiber (%) | 25.8 | 26.0 | 26.8 | 28.0 | 23.4 |
| Crystallinity of three stage drawn fiber (%) | 30.8 | 31.1 | 33.5 | 34.3 | 28.6 |
| First-order draft multiplying power (times) | 2.8 | 2.8 | 2.9 | 2.9 | 2.5 |
| Two-stage drawing ratio | 1.35 | 1.35 | 1.35 | 1.40 | 1.30 |
| Three-stage drawing ratio (times) | 1.05 | 1.10 | 1.20 | 1.20 | 1.10 |
| First-order draft temperature (. Degree. C.) | 65 | 65 | 65 | 65 | 65 |
| Second-stage drawing temperature (. Degree. C.) | 150 | 150 | 160 | 160 | 150 |
| Three-stage draft temperature (. Degree. C.) | 170 | 170 | 180 | 180 | 160 |
| Heat setting temperature (DEG C) | 215 | 215 | 215 | 215 | 215 |
| Differential speed of setting roller and tension roller (%) | 3 | 2 | -2 | -2 | 4 |
The high-strength PA6 industrial yarn prepared by the method has the measured mechanical property indexes shown in Table 2.
TABLE 2 Performance index Table of high-strength PA6 Industrial filaments obtained in examples 1-4 and comparative example 1
| Monofilament linear density (dtex) | Breaking strength (cN/dtex) | Elongation (%) | |
| Example 1 | 6.67 | 8.01 | 22.57 |
| Example 2 | 6.67 | 8.35 | 20.40 |
| Example 3 | 7.78 | 9.12 | 18.80 |
| Example 4 | 8.89 | 9.88 | 16.60 |
| Comparative example 1 | 6.67 | 6.60 | 24.00 |
As shown in Table 2, the high-strength PA6 industrial yarns prepared in examples 1-4 all show good mechanical properties compared with the comparative examples, wherein the breaking strength is greatly improved and can reach 9.88cN/dtex, and the elongation at break is 16.60%, so that the requirements of the industrial yarns are met.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, one skilled in the art may make modifications and equivalents to the specific embodiments of the present invention, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention.
Claims (9)
1. The preparation method for the high-strength PA6 industrial yarn structure process coupling regulation is characterized by comprising the following steps of:
s1: quantitatively and uniformly extruding the PA6 melt from micropores of a spinneret plate, wherein the spinning temperature is 275-285 ℃, so as to obtain PA6 nascent fibers;
s2: the method comprises the steps of feeding PA6 primary fibers into a primary drawing roller through a roller, adjusting the drawing temperature of the primary drawing roller and the drawing multiplying power between the primary drawing roller and a secondary drawing roller to obtain primary drawn fibers, and controlling the crystallinity of the fibers through a enthalpy value method;
s3: carrying out secondary drawing on the primary drawn fiber, and controlling the temperature of a secondary drawing roller, the drawing multiplying power of the secondary drawing roller and the drawing multiplying power of a tertiary drawing roller according to the crystallinity of the primary drawn fiber to obtain the secondary drawn fiber;
s4: performing tertiary drawing on the secondary drawing fiber, and controlling the temperature of a tertiary drawing roller, the drawing multiplying power of the tertiary drawing roller and the drawing multiplying power of a quaternary drawing roller according to the crystallinity of the secondary drawing fiber to obtain the tertiary drawing fiber;
s5: and (3) carrying out heat setting on the three-stage drawn fiber, regulating the temperature of a four-stage drawing roller according to the crystallinity of the three-stage drawn fiber, controlling setting pressure through the speed difference between the four-stage drawing roller and a five-stage drawing roller, and finally winding to prepare the high-strength PA6 industrial yarn.
2. The process coupling regulation and control preparation method for the high-strength PA6 industrial yarn structure according to claim 1, wherein in the step S1, the post-draft ratio is regulated and controlled by controlling the diameter of the spinneret micropores to be 0.3-0.5mm, and regulating the spinneret stretch ratio of the fiber.
3. The process coupling regulation and control preparation method for the high-strength PA6 industrial yarn structure according to claim 1, wherein in the step S2, the primary drawing temperature is 60-75 ℃, the adjustment is carried out according to the linear density of the monofilaments, and the larger the linear density of the monofilaments is, the higher the primary drawing temperature is; the primary draft ratio is 2.5-3.6 times, and the crystallinity of the primary draft fiber is controlled to be 15-25%.
4. The method for preparing the high-strength PA6 industrial yarn structure by coupling process coupling regulation according to claim 1, wherein in the step S2, the enthalpy value method is a method for measuring the crystallinity of the fiber by a differential scanning calorimeter DSC, specifically, online sampling is carried out, and then DSC measurement is carried out, so that the crystallinity of the fiber is obtained.
5. The process coupling regulation and control preparation method of the high-strength PA6 industrial yarn structure according to claim 1, wherein in the step S3, the secondary drawing temperature is 140-170 ℃, the secondary drawing temperature and the drawing multiplying power are regulated according to the crystallinity of the primary drawing fiber, and when the crystallinity of the primary drawing fiber is less than 15%, the drawing temperature is reduced to 140 ℃; when the crystallinity of the primary drawn fiber is 15-20%, the drawing temperature is 141-150 ℃; when the crystallinity of the primary drawn fiber is more than 20%, the drawing temperature is 151-160 ℃; the secondary draft ratio is 1.3-1.5 times, and the secondary draft fiber with the crystallinity of 25-30% is prepared.
6. The process coupling regulation and control preparation method of the high-strength PA6 industrial yarn structure according to claim 1, wherein in the step S4, the tertiary drawing temperature is 160-200 ℃, and the tertiary drawing temperature is controlled according to the crystallinity of the secondary drawing fiber; when the crystallinity is less than 25%, the three-stage drawing temperature is 160 ℃; when the crystallinity is 25-28%, the three-stage drafting temperature is 160-180 ℃; when the crystallinity is more than 28%, the three-stage drafting temperature is 180-200 ℃; three-stage drawing fiber with crystallinity of 30-35% is prepared with three-stage drawing ratio of 1.05-1.20.
7. The process coupling regulation and control preparation method of the high-strength PA6 industrial yarn structure according to claim 1, wherein in the step S5, the heat setting temperature is 215 ℃, the speed difference between a four-stage drawing roller and a five-stage drawing roller is +/-5%, and the tension is controlled; when the crystallinity of the three-stage drawn fiber is less than 30%, the speed difference is 3-5%; when the crystallinity is 30-32%, the speed difference is 0-3%; when the crystallinity is more than 32%, the speed difference is-5% to 0%.
8. The process coupling regulation and control preparation method for the high-strength PA6 industrial yarn structure according to claim 1, wherein the spinning temperature is 275-285 ℃, and the spinning temperature is higher as the linear density of the fiber monofilaments is higher.
9. The high-strength PA6 industrial yarn according to claim 1, wherein the PA6 industrial yarn has a filament linear density of 6 to 10dtex, a breaking strength of 8.0 to 10.0cN/dtex and an elongation of 20.+ -. 5%.
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| CN115323520A (en) * | 2022-08-16 | 2022-11-11 | 神马实业股份有限公司 | Production method of high-strength ultralow-shrinkage polyamide 66 high-denier fiber |
| JP7368918B1 (en) * | 2022-09-29 | 2023-10-25 | ユニチカ株式会社 | Easy-adhesive polyamide film and its manufacturing method |
| CN116949598A (en) * | 2023-06-20 | 2023-10-27 | 海阳科技股份有限公司 | High-strength low-shrinkage PA6 industrial yarn and preparation method thereof |
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