CN117716075A - Para-aramid staple fiber, aramid spun yarn, and method for producing aramid spun yarn - Google Patents
Para-aramid staple fiber, aramid spun yarn, and method for producing aramid spun yarn Download PDFInfo
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Abstract
本发明涉及一种对位芳纶短纤维，该对位芳纶短纤维通过应用4％以上的高伸长率纱线而具有改善的耐切割性，以及一种使用该对位芳纶短纤维生产芳纶纺纱的方法。The present invention relates to a para-aramid short fiber having improved cut resistance by applying a high elongation yarn of more than 4%, and a method using the para-aramid short fiber. Method for producing spun aramid yarn.
Description
Technical Field
Cross Reference to Related Applications
The present application claims priority from korean patent application No.10-2021-0119851, filed on 8 th 9 of 2021, and korean patent application No.10-2022-0106994, filed on 25 th 8 of 2022, each of which is incorporated herein by reference in its entirety.
The present invention relates to a para-aramid staple fiber which can improve cut resistance, an aramid spun yarn, and a method of producing the same.
Background
Aromatic polyamide fibers, which are generally referred to as aramid fibers, include para-aramid fibers having a structure in which benzene rings are directly connected through an amide group (CONH) and meta-aramid fibers having no such structure. Para-aramid fibers have excellent properties such as high strength, high elasticity, and low shrinkage. A thread of about 5mm diameter manufactured using para-aramid fibers has extremely high strength sufficient to lift an automobile weighing about 2 tons.
Such aramid fibers have excellent heat resistance, flame retardancy, chemical resistance, strength, etc., and have a dense structure with a strong molecular structure and high crystallinity, and therefore they are widely used for fire-resistant clothing, protective clothing, safety gloves, etc.
Incidentally, recently, as the demand for para-aramid gloves having improved cut resistance increases with application use, it is important to develop a spinning for gloves having improved cut resistance.
Thus, generally, para-aramid staple fibers having a filament elongation of about 3.5% are used to produce aramid spun yarns, which are then used to make protective gloves. The aramid staple fiber is manufactured by using a tow formed by combining aramid filaments manufactured by a plurality of guide rolls, crimping the tow and then cutting it into a certain length.
However, para-aramid staple fibers have low elongation and thus, improvement in cut resistance is still limited.
Disclosure of Invention
Technical problem
An object of the present invention is to provide a para-aramid staple fiber which not only maintains high spinnability and excellent strength by applying filaments having high elongation, but also can greatly improve cut resistance by increasing a cutting load as compared with conventional staple fibers.
Another object of the present invention is to provide an aramid yarn having excellent cut resistance and mechanical properties using high elongation yarns and short fibers and a method of producing the same.
Technical proposal
Provided herein is a para-aramid staple fiber having an elongation of 4.1% to 6% and a strength of 15g/d to 24 g/d.
The para-aramid staple fiber may include a tow having an elongation of 3.5% to 5.5% and a strength of 15g/d to 24 g/d.
The para-aramid staple fiber may have a fineness of 0.5de to 3.0de and a fiber length of 20mm to 130mm.
Also provided herein is a method of producing an aramid spun yarn comprising applying the para-aramid staple fiber to a ring spinning process to produce an aramid spun yarn having a single yarn of Ne16 to Ne30 and a twist coefficient (TM) in the range of 2.0 to 4.0.
The aramid yarn may have a twist multiplier of Ne20 singles yarn in the range of 2.0 to 4.0.
The aramid yarn can meet an elongation of 3.5% or more and a strength of 7g/d or more.
The ring spinning process may include applying the para-aramid staple fiber to carding, drawing, slubbing, and spinning processes.
The aramid yarn produced as described above may meet a cut resistance index of 6 to 15 measured according to the test method specified in EN388 cut resistance version 2016.
Also provided herein is an aramid yarn comprising para-aramid staple fibers having an elongation of 4.1% to 6% and a strength of 15g/d to 24 g/d.
In addition, the aramid yarn meets an elongation of 3.5% or more and a strength of 7g/d or more. In addition, the aramid yarn meets a cut resistance index of 6 to 15 measured according to the test method specified in EN388 cut resistance version 2016.
The aramid yarn produced as described above can be used for protective gloves or protective clothing.
Advantageous effects
According to the present invention, by applying a filament (yarn) having an elongation of 4% or more (which is higher than conventional filaments), it is possible to provide: compared with the conventional fiber, the para-aramid short fiber can improve the cutting resistance by more than 15 to 60 percent; and a method for producing an aramid yarn which can produce an aramid yarn having improved mechanical properties and cut resistance equivalent to or higher than conventional spinning levels.
In addition, the para-aramid staple fiber and spun yarn of the present invention have excellent spinnability while having relatively high strength, and can meet basic mechanical properties required for industry, as compared with conventional ones.
Detailed Description
Now, para-aramid staple fibers and a method of producing aramid spun yarns according to embodiments of the present invention will be described in more detail.
According to an embodiment of the present invention, a para-aramid staple fiber having an elongation of 4.1% to 6% and a strength of 15g/d to 24g/d may be provided.
Recently, as the demand for para-aramid gloves having improved cut resistance increases with application use, the present inventors studied developing a spun yarn for gloves, which has improved cut resistance compared to conventional para-aramid spun yarn. Accordingly, the inventors have found through experiments that in the case of using a para-aramid staple fiber to which a yarn having a high elongation of at least 4% or more as compared with a conventional yarn is applied, when a spun yarn to which the same level of twist multiplier is applied is provided, the cut resistance can be greatly improved as compared with the conventional yarn, and completed the present invention.
In addition, the high elongation yarns and staple fibers of the present invention may exhibit uniform fineness and spinnability comparable to or higher than conventional yarns and staple fibers.
Para-aramid staple fiber
Filaments or staple fibers made of para-aramid having high elongation will be described below.
The para-aramid yarn can be applied to protective gloves. For example, para-aramid yarns used in size 7 protective gloves typically have a yarn count (Ne 20) of 20 or more and are provided by knitting the glove with 2 twisted yarns.
Incidentally, para-aramid yarn has a low elongation of 4% or less, and therefore, there is a limit in greatly improving the cut resistance.
Accordingly, in the present invention, by providing a short fiber to which a para-aramid filament having an elongation of at least 4% or more, or 4.1% to 6%, or 4.5 to 6% is applied, it can exhibit an excellent effect of improving cut resistance when the twist factor of spun yarn is equal to or lower than that of conventional yarn. That is, as the elongation of para-aramid filaments and staple fibers increases, the flexibility increases, and due to these properties, an aramid yarn can be produced that can improve cut resistance while maintaining excellent mechanical properties even when a twist factor equal to or lower than that of a conventional yarn is applied. In other words, even if the elongation of the para-aramid yarn is 4% or less, the cut resistance index can be improved as compared with the conventional method by adjusting the elongation of the para-aramid filament to a specific range of 4% or more. Specifically, when the elongation of the para-aramid filament is 4.5% to 6%, the toughness increases, and the cut resistance of the spun yarn can be further improved. The para-aramid staple fiber may have an elongation of 4.1% to 6% or a strength of 15g/d to 24 g/d.
The para-aramid staple fibers may include monofilaments having an elongation of 4.1% to 5.5% and a strength of 20g/d to 30 g/d. More specifically, when the para-aramid staple fiber includes monofilaments having an elongation of 4.2% to 5.5%, or 4.5% to 5.5%, or 4.6% to 6%, and a strength of 20g/d to 30g/d, a spun yarn having more excellent cut resistance can be provided.
In addition, the para-aramid staple fiber may include a tow having an elongation of 3.5% to 5.5% and a strength of 15g/d to 24 g/d. When the elongation of the tow is 4.2% to 5.5%, 4.5% to 5.5%, or 4.6% to 6%, the tow may provide more excellent cut resistance for spinning.
If the elongation of the para-aramid short fiber is 4.1% or less, the cut resistance is not improved, and if the elongation exceeds 6%, there is a problem in the filament manufacturing process, and thus the filament cannot be produced.
More preferably, if the spun yarn is produced using a staple fiber to which a high elongation yarn is applied, and then used for manufacturing gloves, the cutting load increases, and the cutting resistance (based on EN388 cutting resistance index) may be improved by about 15 to 60%.
On the other hand, para-aramid staple fibers having high elongation can be produced by: synthesis of para-aramid polymer using poly (paraphenylene terephthalamide) (PPTA) particles having an intrinsic viscosity of 5.0. 5.0 dl/g to 10.0dl/g, and then subjecting the resultant para-aramid polymer to a uniform discharging step of a spinning solution to produce an aramid staple fiber having an elongation of 4.1% to 6% and a strength of 15g/d to 24g/d, the aramid staple fiber comprising being produced using a tow having an elongation of 3.5% to 5.5% and a strength of 20g/d to 30g/d of monofilament.
Specifically, the para-aramid short fiber having an elongation of 4% or more can be produced by adjusting the elongation by:
1) dissolving an aromatic diamine in an organic solvent to prepare a mixed solution, 2) adding an aromatic diacid halide to the mixed solution for the first time and reacting to prepare a prepolymer, 3) adding an aromatic diacid halide to the mixed solution for the second time and reacting to prepare a para-aramid polymer, 4) selecting only a polymer having a diameter of 50 μm to 5,000 μm from the prepared para-aramid polymer and dissolving in sulfuric acid to prepare a spinning solution, and 5) spinning the prepared spinning solution into a fiber shape, solidifying, washing and drying to produce an aramid filament.
Then, 6) gathering the aramid filaments together to produce a bundle-like tow, and then washing the tow with spin oil (e.g., at 50 ℃ to 90 ℃ and 1500L/hr to 5500L/hr), extruding at the end of washing (e.g., squeeze roll pressure: 1.0 bar to 5.0 bar), applying a primary spin oil (e.g., a spin oil having a concentration of 1 wt% to 8 wt% applied at a temperature of 30 ℃ to 70 ℃), and extruding (e.g., extrusion roll pressure: 1.0 bar to 5.0 bar) and annealed with steam, then crimped (e.g., rolled with a roller press of 1.5 bar to 3.5 bar and a stuffer box pressure of 0.3 bar to 1.8 bar) to impart a crimp of 5/inch to 10/inch, applying a secondary spin oil (e.g., a secondary spin oil applied at a concentration of 1 wt.% to 8 wt.% at a rate of 150g/min to 300 g/min), followed by a drying process (e.g., conditions of 75 ℃ to 105 ℃ and 2mpm to 6 mpm) and a cutting process (e.g., a draw ratio of 3% to 15% and a condition of 50mpm to 100 mpm), and passing through a baler (e.g., a condition of 30Hz to 60 Hz) to produce para-aramid staple fibers.
Para-aramid polymers for producing para-aramid short fibers can be produced by using aromatic diamine and aromatic diacid or derivatives thereof as monomers, using an inorganic salt as a catalyst in a polar solvent, and vigorously stirring at a temperature of-10 ℃ to 50 ℃.
The aromatic diamine may include p-phenylenediamine, 4 '-diaminobiphenyl, 2, 6-naphthalenediamine, 1, 5-naphthalenediamine, 4' -diaminobenzanilide, and the like.
Examples of the aromatic diacid or derivative thereof may include aromatic diacid halides, and the aromatic diacid halides may include terephthaloyl dichloride, 4' -benzoyl dichloride, 2, 6-naphthalene dicarboxylic acid dichloride, 1, 5-naphthalene dicarboxylic acid dichloride, and the like.
The organic solvent may include N-methyl-2-pyrrolidone (NMP), N '-dimethylacetamide (DMAc), hexamethylphosphoramide (HMPA), N' -Tetramethylurea (TMU), N-Dimethylformamide (DMF), and mixtures thereof.
Inorganic salts may include CaCl2, liCl, naCl, KCl, liBr and KBr.
The aromatic diamine may include p-phenylenediamine, 4 '-diaminobiphenyl, 2, 6-naphthalenediamine, 1, 5-naphthalenediamine, and 4,4' -diaminobenzanilide.
The aromatic diacid halides may include terephthaloyl dichloride, 4' -benzoyl dichloride, 2, 6-naphthalene dicarboxylic acid dichloride, 1, 5-naphthalene dicarboxylic acid dichloride, and the like.
At this time, the prepolymer may be subjected to an aging treatment for 0 to 48 hours, or the content of the inorganic salt in the polymerization solvent may be adjusted to 40 to 60% by weight with respect to the content of the monomer.
Next, the prepared para-aramid polymer is dissolved in sulfuric acid to prepare a spinning solution, and then the spinning solution is spun into a fiber shape through a spinneret, the spun fiber is coagulated through a coagulation tank and a coagulation tube, washed and dried sequentially through a washing roll and a drying roll, and then wound on a winding roll to produce the para-aramid fiber.
As used herein, "staple fibers" have a length cut from a monofilament.
Accordingly, the para-aramid short fiber produced by the above method may have a fineness of 0.5 to 3.0de and a fiber length of 20 to 130mm.
Fineness can be measured using a FAVIMAT device. In addition, the fiber length can be measured by a method of measuring with naked eyes using a ruler.
Method for producing aramid yarn and aramid yarn
On the other hand, according to another embodiment of the present invention, there may be provided a method of producing an aramid yarn including applying para-aramid staple fiber to a ring spinning process to produce an aramid yarn having a single yarn of Ne16 to Ne30 and a Twist Multiplier (TM) in the range of 2.0 to 4.0.
In this case, "Ne" as used herein means british cotton count (Ne) and is used to represent the count (thickness) of spun yarn. In addition, the yarn count refers to the length per unit weight when the yarn length of 840 yards is made from cotton having a weight of 1 pound.
According to the present invention, filaments or staple fibers made of para-aramid having high elongation can be used to provide spun aramid yarns having excellent cut resistance, and thus will be described in more detail below.
As described above, the para-aramid staple fiber has a characteristic that it has an elongation of 4.1% to 6%, which is higher than that of the conventional fiber, and also has a strength of 15g/d to 24 g/d. Such para-aramid staple fiber can be applied even at a relatively high carding speed, for example, it can have high uniformity and excellent mechanical properties even when carded at a speed of 30kg/hr or more, thereby achieving high spinnability and excellent spinning yield.
The present invention can greatly improve cut resistance compared to conventional yarns when providing spun yarns to which a twist multiplier equal to that of conventional yarns is applied. That is, setting the twist multiplier within a certain range contributes to improving the cut resistance of the aramid yarn in addition to the filaments or staple fibers made of para-aramid having high elongation in the spinning production process. In other words, by setting the twist multiplier within a certain range, it is possible to contribute to improvement of the cut resistance of the aramid yarn, in addition to the filaments or staple fibers made of para-aramid having high elongation in the spinning production process.
Specifically, the aramid yarn can be produced by: the para-aramid staple fiber having the above characteristics is applied and subjected to a ring spinning process to have a single yarn of Ne16 to Ne30 count, the Twist Multiplier (TM) of such single yarn is adjusted to be in the range of 2.0 to 4.0, and the yarns are plied. Therefore, when the twist multiplier is applied to the above range within the single yarn count, the aramid yarn can improve the cut resistance as compared with the conventional yarn. In addition, even if the twist coefficient is within the single yarn count as before, the para-aramid staple fiber having specific physical properties is used, so that the cut resistance of the ply-twisted aramid yarn can be further improved.
More specifically, the Twist Multiplier (TM) of the single yarn of the Ne20 of the aramid yarn may be in the range of 2.0 to 4.0, or 2.0 to 3.5, or 2.0 to 3.0, or 2.0 to 2.5. In addition, the aramid yarn can meet a ply-spun yarn elongation of 3.5% or more and a strength of 7g/d or more. At this time, when the count of the aramid yarn is Ne20, if the twist factor (TM) of the single yarn having the count of Ne20 is 2.0 or less, there is a problem in that the twist factor is too small and the single fiber is unwound, which makes it difficult to produce the yarn. In addition, if the twist factor (TM) of Ne20 single yarn is 4.0 or more, the spun yarn becomes stiff due to excessive twisting, which may reduce wearing comfort and may deform the shape of the glove produced.
In this case, the glove manufactured using spinning can achieve 15% to 60% improvement in cut resistance as compared with the conventional glove.
According to a preferred embodiment, the aramid yarn produced as described above may meet a cut resistance index of 12 to 18 measured according to the test method specified in EN388 cut resistance version 2016. More specifically, the cut resistance index may be 12 to 17, or 12.3 to 16.7.
In addition, the ring spinning process may be provided according to methods known in the art. For example, ring spinning processes include carding, drawing, and spinning processes on para-aramid staple fibers to provide spun yarns having the single yarn range and twist multiplier described above. In this case, a blowing process may be further included before the carding process. In addition, the ring spinning process may also include a roving process to stretch the sliver and provide minimal twist after the stretching process is completed.
More specifically, the step of carding para-aramid staple fibers at a speed of 30kg/hr or more may be performed under the following conditions: wherein the card clothing density of the stationary carding bars in the carding machine is applied at 200PPSI to 700PPSI for the doffer upper end, at 10PPSI to 400PPSI for the licker-in upper end, and at a cylinder speed of 200rpm to 500 rpm.
The aramid yarn produced as described above can meet an elongation of 3.5% or more and a strength of 7g/d or more for a single yarn of Ne16 to Ne30 as well as a ply-spun yarn.
The method of producing aramid yarn may include attenuating sliver or roving as a continuous fiber bundle and gathering the fiber bundles together for twisting.
In addition, the method of producing an aramid yarn may further include gathering the sub-tapes obtained after the carding step together to perform the drawing step and the spinning step.
The aramid filaments are gathered together using a plurality of guide rolls to produce a bundle-shaped tow, and then the tow is washed with spin oil, extruded at the end of washing, applied with a primary spin oil, extruded at the end of primary spin oil application and annealed with steam, and then crimped to produce a crimp of 5/inch to 10/inch, applied with a secondary spin oil, followed by a drying process and a cutting process, and passed through a baler to produce para-aramid staple fibers.
The produced aramid staple fibers may be subjected to a carding process to produce a plurality of sub-strips. That is, the short aramid fibers may be aligned in parallel by a carding process to obtain sub-strips as fiber aggregates.
Then, after the sub-slivers are put together, the slivers are subjected to a minimum twisting to maintain the strength thereof by a drawing process, and then the slivers are twisted while being drawn by a spinning process to produce an aramid yarn.
Thus, according to another embodiment of the present invention, an aramid yarn including para-aramid staple fibers having an elongation of 4.1% to 6% and a strength of 15g/d to 24g/d may be provided.
Accordingly, as described above, the aramid yarn according to the present invention may have a single yarn having a count of Ne16 to Ne30 and a Twist Multiplier (TM) of 2.0 to 4.0.
In addition, the aramid yarn meets an elongation of 3.5% or more and a strength of 7g/d or more. In addition, the aramid yarn meets a cut resistance index of 6 to 15 measured according to the test method specified in EN388 cut resistance version 2016.
At this time, the strength and elongation of the para-aramid monofilament, the para-aramid staple fiber and the para-aramid spun yarn according to the present invention can be evaluated according to the KS K ISO 2062 test method. Furthermore, the setting conditions of the gauge length and the test speed can be measured according to the contents in the manual.
In addition, the cut resistance index of the spun yarn may be evaluated based on the test method specified in EN388 cut resistance version 2016. Accordingly, the aramid yarn has excellent cut resistance, and thus can be applied to products including protective gloves or protective clothing, more preferably, protective gloves. The protective glove comprises a protective glove with the specification No. 7, and the protective suit can comprise a fire-fighting suit, a welding suit, a professional protective suit and the like. The product may be a knitted or woven fabric comprising aramid yarns. Most preferably, the product may be a size 7 protective glove comprising a knitted fabric of aramid yarn. The knitted or woven fabric may be knitted according to methods known in the art.
As described above, the present invention can provide an effect of improving cut resistance even when a high elongation yarn/staple fiber is applied and TM is low, so that it can reduce the risk of injury to workers, and thus improve stability when applied to protective gloves (e.g., no. 7 specification glove) and protective clothing.
The present invention will be explained in more detail with reference to the following examples. However, the following examples are for illustrative purposes only and thus do not limit the scope of the present invention.
Examples and comparative examples: production of aramid staple fiber and aramid spun yarn
As shown in tables 1 and 2, para-aramid staple fibers and aramid spun yarns were produced by varying yarn properties and spinning conditions.
Example 1
Comprises NMP as an organic solvent and CaCl as an inorganic salt in a weight ratio of 92:8 2 Is placed in a reactor under a nitrogen atmosphere, and p-phenylene diamine (PPD) is added thereto so that the concentration of PPD in the slurry is 5 wt% to prepare the slurry.
Then, 40 mole% terephthaloyl chloride (TPC), corresponding to the mole number of PPD, was added to the slurry, and then reacted to prepare a para-aramid prepolymer.
Subsequently, 60 mole% of TPC corresponding to the mole number of PPD was secondarily added to the prepared para-aramid prepolymer, and then reacted to prepare a para-aramid polymer.
The para-aramid polymer obtained as described above was dissolved in 99.8 wt% sulfuric acid at 19 wt% based on the total weight of the spinning solution to produce a spinning solution. And spinning the spinning solution into a fiber shape through a spinneret, solidifying the spun fiber when passing through a solidification tank and a solidification pipe, washing and drying the spun fiber sequentially through a washing roller and a drying roller, and winding the spun fiber on a winding roller to produce the para-aramid filament with single yarn fineness of 1.5 denier and elongation of 4.9 percent. At this time, the elongation of the para-aramid yarn was 4.5%.
Next, the aramid filaments are gathered together using a plurality of guide rolls to produce a bundle-shaped tow, and then the tow is washed with spin oil, extruded at the end of washing, applied with a primary spin oil, extruded and annealed with steam at the end of primary spin oil application, and then crimped to produce a crimp of 5/inch to 10/inch, and applied with a secondary spin oil, followed by a drying process and a cutting process, and passed through a baler to produce para-aramid staple fibers.
Next, a ring spinning process is performed on the para-aramid staple fiber to produce an aramid spun yarn.
Specifically, a card clothing density of a fixed carding bar in a carding machine is applied at an upper end of a doffer at 200PPSI to 700PPSI, a licker-in upper end at 10PPSI to 400PPSI, and a cylinder speed is applied at 200rpm to 500rpm, a high-speed carding process of 30kg/hr or more is performed to produce para-aramid staple fibers into a plurality of sub-strips. Each sub-sliver is then gathered together and then subjected to a drawing process to twist the sliver and maintain strength at the levels shown in table 1. Then, the sliver was simultaneously twisted and drawn by the slub and spinning process to produce a single yarn having a count of 20 (Ne 20) and a Twist Multiplier (TM) of 2.3TM, and the 2 single yarns were combined together to produce an aramid 2-ply spun yarn (spinning end product count: 20/2).
Example 2
Para-aramid staple fiber and aramid spun yarn were produced in the same manner as in example 1, except that the twist factor of a single yarn having a count of 20 (Ne 20) was set to TM2.9 in the spinning production process as shown in table 1 below.
Example 3
Para-aramid staple fiber and aramid spun yarn were produced in the same manner as in example 1, except that the twist factor of a single yarn having a count of 20 (Ne 20) was set to TM3.5 in the spinning production process as shown in table 1 below.
Example 4
Para-aramid staple fiber and aramid spun yarn were produced in the same manner as in example 1, except that para-aramid monofilament and para-aramid staple fiber having an elongation of 4.1% were used as shown in the following table 1.
Comparative example 1
An aramid yarn was produced in the same manner as in example 1, except that para-aramid short fibers having an elongation of 4.0% and a strength of 20g/d, which were generally used in the past, were used according to the conditions of table 1, as shown in table 2 below.
Comparative example 2
An aramid yarn was produced in the same manner as in example 2, except that para-aramid short fibers having an elongation of 4.0% and a strength of 20g/d, which were generally used in the past, were used according to the conditions of table 1, as shown in table 2 below.
Comparative example 3
An aramid yarn was produced in the same manner as in example 3, except that para-aramid short fibers having an elongation of 4.0% and a strength of 20g/d, which were generally used in the past, were used according to the conditions of table 1, as shown in table 2 below.
Test example
The properties of the para-aramid fibers and the spun yarns of the examples and the comparative examples were evaluated by the following methods, and the results are shown in tables 1 and 2 below.
(1) Measurement of strength and elongation of monofilaments, staple fibers and spun yarns
The spun yarn was evaluated using the USTER apparatus using the KS K ISO 2062 test method, and the set conditions of the gauge length and the test speed were measured according to the manual content.
(2) Measuring cut resistance
The cut resistance of the examples and comparative examples was evaluated based on the test method specified in EN388 cut resistance version 2016. The cut resistance was evaluated by manufacturing knitted fabrics using the para-aramid yarns of examples and comparative examples by glove knitting using a glove knitting machine for the size of a No. 7 standard protective glove (manufactured with 20 count, 2 ply, 5 ply 100% para-aramid yarn).
TABLE 1
TABLE 2
As shown in tables 1 and 2, the aramid yarns of examples 1 to 4 use para-aramid staple fibers having an elongation of 4.1% to 6% and a strength of 15g/d to 24g/d, and thus, when the twist factor of the spun yarn is given at the same level as before (the twist factor of a single yarn having a count of 20 (Ne 20) is TM2.3 to 3.5), they exhibit significantly improved cut resistance as compared with comparative examples 1 to 3. In particular, the present invention uses high elongation yarns and short fibers, and thus, when TM is reduced to about 2.3, cut resistance is greatly improved as compared with comparative examples 1 to 3. That is, it has been confirmed that in examples 1 to 3, the cut resistance of the spun yarn was further improved by using the para-aramid staple fiber comprising the tow having a strength of 22.7g/d and a high elongation of 4.5%. In particular, example 1 exhibited the highest cut resistance even at low twist multiplier, thereby providing a protective glove having excellent quality and stability. In addition, example 4 using a yarn having an elongation of 4.1% exhibited further improved cut resistance as compared to comparative example 1 using a yarn having an elongation of 4.0%.
On the other hand, comparative examples 1 to 3 used a staple fiber having an elongation of 4.0% (this elongation is a level commonly used), and the elongation of the tows included in the para-aramid staple fiber was 3.5%, and exhibited a strength of 21.5g/d, and therefore, it can be seen that when a twist factor (twist factor: TM of a single yarn having a count of 20 (Ne 20) is 2.3 to 3.5) was applied under the same conditions as in examples 1 to 3, they exhibited relatively low cut resistance than in examples.
Claims (14)
1. Para-aramid staple fibers having an elongation of 4.1% to 6% and a strength of 15g/d to 24 g/d.
2. The para-aramid staple fiber of claim 1 wherein:
the para-aramid staple fiber includes a tow having an elongation of 3.5% to 5.5% and a strength of 15g/d to 24 g/d.
3. The para-aramid staple fiber of claim 1 wherein:
the fineness of the para-aramid short fiber is 0.5 to 3.0de and the fiber length is 20 to 130mm.
4. A method of producing an aramid yarn comprising applying the para-aramid staple fiber of claim 1 to a ring spinning process to produce an aramid yarn having a single yarn of Ne16 to Ne30 and a Twist Multiplier (TM) in the range of 2.0 to 4.0.
5. The method for producing an aramid yarn according to claim 4, wherein:
the twist factor of the Ne20 single yarn of the aramid yarn is in the range of 2.0 to 4.0.
6. The method for producing an aramid yarn according to claim 4, wherein:
the aramid yarn meets the elongation of more than 3.5% and the strength of more than 7 g/d.
7. The method for producing an aramid yarn according to claim 4, wherein:
the ring spinning process includes applying the para-aramid staple to carding, drawing, slubbing and spinning processes.
8. The method for producing an aramid yarn according to claim 4, wherein:
the aramid yarn produced meets a cut resistance index of 12 to 18 measured according to the test method specified in EN388 cut resistance version 2016.
9. An aramid yarn comprising para-aramid staple fibers having an elongation of 4.1% to 6% and a strength of 15g/d to 24 g/d.
10. The aramid yarn of claim 9 having a single yarn of Ne16 to Ne30 and a Twist Multiplier (TM) of 2.0 to 4.0.
11. The aramid yarn of claim 9 wherein:
the elongation of the ply-spun yarn is 3.5% or more, and the strength of the ply-spun yarn is 7g/d or more.
12. The aramid yarn of claim 9 wherein:
the aramid yarn meets a cut resistance index of 6 to 15 measured according to the test method specified in EN388 cut resistance version 2016.
13. The aramid yarn according to claim 9, which is used for protective gloves or protective clothing.
14. The aramid yarn of claim 9 for a No. 7 gauge protective glove comprising the knitted fabric of the aramid yarn.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| KR10-2021-0119851 | 2021-09-08 | ||
| KR10-2022-0106994 | 2022-08-25 | ||
| KR1020220106994A KR102860998B1 (en) | 2021-09-08 | 2022-08-25 | Para-aramid staple fiber, aramid spun yarns and manufacturing method threof |
| PCT/KR2022/012812 WO2023038346A1 (en) | 2021-09-08 | 2022-08-26 | Para-aramid staple fiber, aramid spun yarns and manufacturing method threof |
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| CN117716075A true CN117716075A (en) | 2024-03-15 |
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| JP2008274496A (en) * | 2007-05-07 | 2008-11-13 | Asahi Kasei Fibers Corp | Spun yarn |
| CN102383218A (en) * | 2011-08-26 | 2012-03-21 | 南充易安新材料有限公司 | High strength and high modulus para-aramid fiber and preparation method thereof |
| KR20160010917A (en) * | 2014-07-21 | 2016-01-29 | 삼일방 (주) | Long staple aramid fiber air-jet yarn having excellent uniformity, stress and strain, friction resistance and process of producing thereof |
| KR20160032493A (en) * | 2014-09-16 | 2016-03-24 | 코오롱인더스트리 주식회사 | Method of manufacturing aramid copolymer and copolymerized aramid fiber |
| KR20160072408A (en) * | 2014-12-15 | 2016-06-23 | 코오롱인더스트리 주식회사 | Method of manufacturing aramid copolymer and copolymerized aramid fiber |
| JP2016186143A (en) * | 2015-03-27 | 2016-10-27 | 東レ・デュポン株式会社 | Crimped aramid short fibers and high-strength spun yarns, fiber structures and protective materials comprising the same |
| JP2017082351A (en) * | 2015-10-27 | 2017-05-18 | 東レ・デュポン株式会社 | Spun yarn and knitted fabric |
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2022
- 2022-08-26 CN CN202280047010.3A patent/CN117716075A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008274496A (en) * | 2007-05-07 | 2008-11-13 | Asahi Kasei Fibers Corp | Spun yarn |
| CN102383218A (en) * | 2011-08-26 | 2012-03-21 | 南充易安新材料有限公司 | High strength and high modulus para-aramid fiber and preparation method thereof |
| KR20160010917A (en) * | 2014-07-21 | 2016-01-29 | 삼일방 (주) | Long staple aramid fiber air-jet yarn having excellent uniformity, stress and strain, friction resistance and process of producing thereof |
| KR20160032493A (en) * | 2014-09-16 | 2016-03-24 | 코오롱인더스트리 주식회사 | Method of manufacturing aramid copolymer and copolymerized aramid fiber |
| KR20160072408A (en) * | 2014-12-15 | 2016-06-23 | 코오롱인더스트리 주식회사 | Method of manufacturing aramid copolymer and copolymerized aramid fiber |
| JP2016186143A (en) * | 2015-03-27 | 2016-10-27 | 東レ・デュポン株式会社 | Crimped aramid short fibers and high-strength spun yarns, fiber structures and protective materials comprising the same |
| JP2017082351A (en) * | 2015-10-27 | 2017-05-18 | 東レ・デュポン株式会社 | Spun yarn and knitted fabric |
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