Fire resistant skin-friendly composite yarn overcoming residual torque and its spinning method

Abstract

The application discloses a fireproof skin-friendly composite yarn overcoming residual torque and a spinning method thereof. The composite yarn comprises two soft flame-retardant short fiber slivers and one high-stiffness filament, the high-stiffness filament is wrapped around one soft flame-retardant short fiber sliver to form a wrapped yarn, and the wrapped yarn is twisted with the other soft flame-retardant short fiber sliver to form a plurality of repeated twist zones, the twist zones sequentially comprise a forward strong twisted strand structure zone, a forward weak twisted strand structure zone, a reverse weak twisted strand structure zone, a reverse strong twisted strand structure zone, a reverse weak twisted strand structure zone and a forward weak twisted strand structure zone. The spinning method is as follows: the two soft flame-retardant short fiber slivers and the high-stiffness filament are simultaneously fed into a rubbing roller device in parallel and subjected to repeated rubbing and twisting in a back-and-forth movement, so that the residual torque in the composite yarn is eliminated, the composite yarn is not prone to causing itching caused by high-stiffness burrs, the heat and moisture comfort is improved, and the composite yarn with excellent wearing performance is formed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textiles, and particularly relates to a fireproof skin-friendly composite yarn overcoming residual torque and a spinning method thereof. BACKGROUND

[0002] Basalt fiber, glass fiber, carbon fiber and other high-rigidity brittle fiber materials not only have higher strength and modulus than ordinary fibers, but also have excellent high-temperature resistance, flame resistance and chemical stability. However, inorganic fibers are prone to splitting in the twisting condition, and further cause itching. Organic short fibers such as cotton and aramid fibers usually have low modulus, and have the characteristics of strong spinnability and good comfort. In order to combine the advantages of filaments and short fibers, spinning composite technology is used to make up for the shortcomings of organic fibers and inorganic fibers, and long fibers and short fibers. Unfortunately, there is a large modulus difference between organic fibers and inorganic fibers. High-modulus inorganic filaments are prone to breakage under high-twist conditions, while low-modulus organic fibers cannot well hold the yarn under no-twist conditions. In addition, when plying the yarn made of high-rigidity brittle fibers, the fiber bundle has poor bundling performance and serious splitting due to uneven plying tension and other factors. Therefore, how to spin high-rigidity brittle fiber materials into yarn and improve their wearability is the current research focus.

[0003] Chinese patent CN102296389B discloses a composite spinning device and method for covering rigid fiber filaments with chemical fiber filaments. The method can solve the problem of easy breakage of rigid fiber filaments, while maintaining their high strength and high modulus characteristics, and also protecting the fibers from damage during processing and use. However, when wrapping rigid fibers with conventional ring spinning technology, a sufficient amount of twist needs to be applied to completely cover the rigid fiber filaments. This over-twisting method will cause excessive residual torque inside the yarn, causing severe yarn twist contraction, which is easy to cause discomfort to the wearer, and the rigid fiber filaments are prone to breakage under excessive torsional stress, making it difficult to proceed to the next process.

[0004] Therefore, it is necessary to explore a new spinning technology for fireproof skin-friendly composite yarn overcoming residual torque, wear resistance and high temperature, in order to solve the problems existing in the traditional twisting method and improve the quality and production efficiency of the yarn. SUMMARY

[0005] The present application relates to the technical field of textiles, and particularly relates to a fireproof skin-friendly composite yarn overcoming residual torque and a spinning method thereof.

[0006] The fireproof skin-friendly composite yarn of the present application overcomes residual torque, comprising two soft flame-retardant short fiber strands and a high stiffness filament, one of the high stiffness filaments is wrapped around one of the soft flame-retardant short fiber strands to form a wrapped yarn, the wrapped yarn is twisted with the other soft flame-retardant short fiber strand to form a plurality of repeated twisted areas, the twisted areas in turn include a positive strong twist strand structure area, a positive weak twist strand structure area, a reverse weak twist strand structure area, a reverse strong twist strand structure area, a reverse weak twist strand structure area and a positive weak twist strand structure area.

[0007] Further, in the positive strong twist strand structure area and the positive weak twist strand structure area, the high stiffness filament is positively wrapped around one of the soft flame-retardant short fiber strands.

[0008] Further, in the reverse weak twist strand structure area and the reverse strong twist strand structure area, the high stiffness filament is reversely wrapped around one of the soft flame-retardant short fiber strands.

[0009] Further, the soft flame-retardant short fiber strand is a polyimide fiber or an aramid fiber or a polytetrafluoroethylene fiber or a polyphenylene sulfide fiber.

[0010] Further, the high stiffness filament is a basalt fiber filament or a quartz fiber filament or a ceramic fiber filament or a carbon fiber filament or a silicon carbide fiber filament.

[0011] A spinning method of the fireproof skin-friendly composite yarn for overcoming the residual torque as described above, two bundles of soft flame-retardant short fiber slivers and one high stiffness filament are simultaneously fed into the twisting roller device for twisting treatment, and the two bundles of soft flame-retardant short fiber slivers and one high stiffness filament are subjected to repeated friction twisting back-and-forth movement under the action of the twisting roller; the process of repeated friction twisting is as follows: when a positive twisting action is applied, one high stiffness filament and one bundle of soft flame-retardant short fiber slivers are positively wrapped to form a wrapped yarn, and at the same time, the wrapped yarn is positively twisted with the other bundle of soft flame-retardant short fiber slivers to form a positive strong twist strand structure zone; then when a reverse twisting action is applied, the wrapped yarn and the other bundle of soft flame-retardant short fiber slivers first form a positive weak twist strand structure zone, then a reverse weak twist strand structure zone, and then a reverse strong twist strand structure zone; wherein the positive weak twist strand structure zone is that the high stiffness filament is positively wrapped on the soft flame-retardant short fiber sliver, and the reverse weak twist strand structure zone and the reverse strong twist strand structure zone are that the high stiffness filament is reversely wrapped on the soft flame-retardant short fiber sliver; when a positive twisting action is applied again, part of the residual torque is released, and the wrapped yarn and the other bundle of soft flame-retardant short fiber slivers first form a reverse weak twist strand structure zone, then a positive weak twist strand structure zone, and then a positive strong twist strand structure zone; wherein the reverse weak twist strand structure zone is that the high stiffness filament is reversely wrapped on the soft flame-retardant short fiber sliver, and the positive weak twist strand structure zone and the positive strong twist strand structure zone are that the high stiffness filament is positively wrapped on the soft flame-retardant short fiber sliver; the above-mentioned back-and-forth twisting movement is repeatedly performed to obtain a fireproof skin-friendly composite yarn with low residual torque.

[0012] Further, 5-10 cm of positive twisting action is applied each time.

[0013] Further, 5-10 cm of reverse twisting action is applied each time.

[0014] Further, the twisting direction when the positive twisting action is applied is S twist, and the twisting direction when the reverse twisting action is applied is Z twist; or the twisting direction when the positive twisting action is applied is Z twist, and the twisting direction when the reverse twisting action is applied is S twist.

[0015] Further, the feeding speed of the soft flame-retardant short fiber sliver is 0.4-1 m / min, the feeding speed of the high stiffness filament is 10-30 m / min, the output speed is 10-30 m / min, the relative distance between one high stiffness filament and one bundle of soft flame-retardant short fiber slivers in the wrapped yarn is 0-15 mm, the twist factor is 150-250, and the twist direction is S and Z cyclically alternating.

[0016] The present invention adopts a reciprocating twisting method to synchronously apply positive twist to a high-rigidity filament and two bundles of soft flame-retardant short fiber strands, and then performs reverse twisting, thereby changing the twisting motion trajectory of the fibers, balancing the torsional stress distribution between the fibers, and eliminating the residual torque inside the yarn. Since the positive and reverse twisting motions of the twisting rollers eliminate the residual torque inside the yarn, the composite yarn is not prone to the itchy feeling caused by high-rigidity burrs, its thermal and moisture comfort is improved, and a high-performance composite yarn with excellent wearing performance is formed.

[0017] By controlling the relative position of high-rigidity filaments and soft, flame-retardant staple fiber strands, the present invention adjusts the wrapping angle between them, thereby producing yarns of varying structures and qualities. As the relative distance between the high-rigidity filaments and the soft, flame-retardant staple fiber strands increases, the wrapping angle between them increases, strengthening the mutual binding effect and increasing the coverage of the soft, flame-retardant staple fiber over the high-rigidity, brittle filaments. This reduces the likelihood of the high-rigidity, brittle filaments splitting under external forces, resulting in burrs and improving wearability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a fire-resistant and skin-friendly composite yarn that overcomes residual torque in a spinning method provided by the present invention.

[0019] 1. Upper twisting roller; 2. Lower twisting roller; 3. Soft flame-retardant staple fiber strands; 4. High-rigidity filaments; 5. Twisting triangle area; 6. Forward strong twist strand structure area; 7. Forward weak twist strand structure area; 8. Reverse weak twist strand structure area; 9. Reverse strong twist strand structure area. DETAILED DESCRIPTION

[0020] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0021] like Figure 1 As shown, the present invention provides a fire-resistant and skin-friendly composite yarn that overcomes residual torque and a spinning method thereof, comprising the following steps:

[0022] A spinning method for a fire-resistant and skin-friendly composite yarn that overcomes residual torque as described above, wherein two bundles of soft flame-retardant staple fiber strands and a high-rigidity filament are simultaneously fed into a rubbing roller device in parallel for twisting. The two bundles of soft flame-retardant staple fiber strands and the high-rigidity filament are subjected to repeated friction and twisting back and forth motion under the action of the rubbing rollers. The repeated friction and twisting process is specifically as follows:

[0023] When a forward twisting action is applied, one high stiffness filament and one bundle of soft flame-retardant short fiber sliver are forwardly wrapped to form a wrapped yarn, and the wrapped yarn is forwardly twisted with another bundle of soft flame-retardant short fiber sliver to form a forward strong twist structure zone; then when a reverse twisting action is applied, the wrapped yarn is first formed into a forward weak twist structure zone with another bundle of soft flame-retardant short fiber sliver, then into a reverse weak twist structure zone, and then into a reverse strong twist structure zone; wherein the forward weak twist structure zone is that the high stiffness filament is forwardly wrapped on the soft flame-retardant short fiber sliver, the reverse weak twist structure zone and the reverse strong twist structure zone are that the high stiffness filament is reversely wrapped on the soft flame-retardant short fiber sliver; when a forward twisting action is applied again, part of the residual torque is released, and the wrapped yarn is first formed into a reverse weak twist structure zone with another bundle of soft flame-retardant short fiber sliver, then into a forward weak twist structure zone, and then into a forward strong twist structure zone; wherein the reverse weak twist structure zone is that the high stiffness filament is reversely wrapped on the soft flame-retardant short fiber sliver, the forward weak twist structure zone and the forward strong twist structure zone are that the high stiffness filament is forwardly wrapped on the soft flame-retardant short fiber sliver; the above-mentioned back-and-forth twisting motion is repeatedly performed to obtain a low-residual-torque fireproof skin-friendly composite yarn.

[0024] Two bundles of soft flame-retardant short fiber slivers and one high stiffness filament are subjected to the forward and reverse twisting stresses cyclically applied by a pair of twisting rollers to form a yarn structure with one forward twist and one reverse twist; the forward torque and the reverse torque in the composite yarn cancel each other out to form a high-performance composite yarn in which the soft flame-retardant short fiber slivers and the high stiffness filament are wrapped around each other and have no residual torque.

[0025] In the above twisting spinning process, the parameters can be respectively set as follows: the soft flame-retardant short fiber feeding speed is 0.4-1 m / min; the high stiffness filament feeding speed is 10-30 m / min; the output speed is 10-30 m / min; in the wrapped yarn, the relative distance between one high stiffness filament and one bundle of soft flame-retardant short fiber slivers is 0-15 mm; the twist factor is 150-250, and the twist direction is S and Z which are cyclically alternated.

[0026] Example 1

[0027] A 19.7 tex composite yarn is produced by using the spinning method of the application. The soft flame-retardant short fiber sliver is polyimide fiber, and the high stiffness filament is basalt filament; the polyimide fiber feeding speed is 0.6 m / min; the basalt filament feeding speed is 14 m / min; the output speed is 14 m / min; in the wrapped yarn, the relative distance between one high stiffness filament and one bundle of soft flame-retardant short fiber slivers is 4 mm; the twist factor is 180, and the twist direction is S and Z which are cyclically alternated.

[0028] Example 2

[0029] The 19.7 tex composite yarn is produced by using the spinning method of the application. The soft flame-retardant short fiber strand is aramid fiber, and the high stiffness filament is carbon fiber filament; the feeding speed of the aramid fiber is 0.7 m / min; the feeding speed of the carbon fiber filament is 19 m / min; the output speed is 19 m / min; in the wrapped yarn, the relative distance between the feeding of one high stiffness filament and the soft flame-retardant short fiber strand is 6 mm; the twist factor is 200, and the twist direction is S and Z cyclic alternation.

[0030] Example 3

[0031] The 19.7 tex composite yarn is produced by using the spinning method of the application. The soft flame-retardant short fiber strand is aramid fiber, and the high stiffness filament is carbon fiber filament; the feeding speed of the aramid fiber is 0.7 m / min; the feeding speed of the carbon fiber filament is 19 m / min; the output speed is 19 m / min; in the wrapped yarn, the relative distance between the feeding of one high stiffness filament and the soft flame-retardant short fiber strand is 6 mm; the twist factor is 200, and the twist direction is S and Z cyclic alternation.

[0032] Comparative Example 1

[0033] The 19.7 tex Sirofil composite yarn is produced by using the traditional ring spinning method. The twist direction is only Z twist, without the repetition of the forward twisting action and the reverse twisting action, and the other conditions are the same as those in Example 1.

[0034] The main performance of each yarn sample is tested, in which the residual torque is tested by using the wet wrapping method, and the main performance test results of each yarn sample are shown in Table 1.

[0035] Table 1

[0036]

[0037] As shown in Table 1, compared with the Sirofil composite yarn spun by using the traditional ring spinning machine, the residual torque (wet kink number) of the composite yarn spun by using the spinning method of the application is significantly reduced, the breaking strength and the breaking elongation are greatly improved, the hairiness condition is improved to a certain extent, and the evenness performance is slightly decreased. The reason is that the spinning method of the application balances the torsional stress distribution between the fibers, eliminates the residual torque in the yarn, and makes the high stiffness filament in a state of almost no twist contraction, which can greatly exert the high strength characteristics of the high stiffness filament. However, the counteraction of the positive and negative twisting movements of the twisting roller reduces the binding effect of the filament on the short fibers, resulting in a certain unevenness. The technical method of the application is not only simple, but also effectively eliminates the residual torque in the yarn, improves the quality of the finished yarn, and has low manufacturing cost, which is suitable for popularization and application in the textile industry.

[0038] The above not involved, apply to the prior art.

[0039] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood that the examples are for illustration only and should not limit the scope of the present application. Those skilled in the art can make various modifications or additions or employ similar ways to replace the described specific embodiments without departing from the spirit of the present application or exceeding the scope of the appended claims. Those skilled in the art should understand that any modification, equivalent replacement, improvement, etc. made according to the technical essence of the present application to the above embodiments should be included in the protection scope of the present application.

Claims

1. A spinning method for fire-resistant and skin-friendly composite yarn that overcomes residual torque, characterized by: The flame-retardant and skin-friendly composite yarn for overcoming residual torque includes two bundles of soft flame-retardant staple fiber strands and a high-rigidity filament, wherein one of the high-rigidity filaments is wrapped around one bundle of the soft flame-retardant staple fiber strands to form a wrapped yarn, and the wrapped yarn is twisted with the other bundle of the soft flame-retardant staple fiber strands to form a plurality of repeated twisting zones, wherein the twisting zones sequentially include a forward strong twist strand structure zone, a forward weak twist strand structure zone, a reverse weak twist strand structure zone, a reverse strong twist strand structure zone, a reverse weak twist strand structure zone, and a forward weak twist strand structure zone; The spinning method is as follows: two bundles of soft flame-retardant staple fiber strips and a high-rigidity filament are fed into a rubbing roller device in parallel for twisting treatment at the same time, and the two bundles of soft flame-retardant staple fiber strips and the high-rigidity filament are subjected to repeated friction and twisting back and forth motions under the action of the rubbing rollers; the process of repeated friction and twisting is specifically as follows: when a forward twisting action is applied, a high-rigidity filament and a bundle of soft flame-retardant staple fiber strips are forwardly wrapped to form a bundle of wrapped yarns, and at the same time, the wrapped yarn and another bundle of soft flame-retardant staple fiber strips are forwardly twisted to form a forward strong twist strand structure area; and when a reverse twisting action is then applied, the wrapped yarn and another bundle of soft flame-retardant staple fiber strips first form a forward weak twist strand structure area, then form a reverse weak twist strand structure area, and then form a reverse strong twist strand structure area; wherein, the forward weak twist strand area is the first strand area of ​​the soft flame-retardant staple fiber strips, and then form a reverse weak twist strand structure area. The twisted yarn structure area is composed of high-rigidity filaments wrapped forwardly on the soft flame-retardant staple fiber strips, and the reverse weak twisted yarn structure area and the reverse strong twisted yarn structure area are composed of high-rigidity filaments wrapped reversely on the soft flame-retardant staple fiber strips; when the forward twisting action is applied again, part of the residual torque is released, and the wrapped yarn and another bundle of soft flame-retardant staple fiber strips first form a reverse weak twisted yarn structure area, then form a forward weak twisted yarn structure area, and then form a forward strong twisted yarn structure area; among them, the reverse weak twisted yarn structure area is composed of high-rigidity filaments wrapped reversely on the soft flame-retardant staple fiber strips, and the forward weak twisted yarn structure area and the forward strong twisted yarn structure area are composed of high-rigidity filaments wrapped forwardly on the soft flame-retardant staple fiber strips; the back-and-forth twisting motion is repeated continuously to obtain a fire-resistant and skin-friendly composite yarn with low residual torque; Apply 5-10 cm of forward twisting action each time; apply 5-10 cm of reverse twisting action each time.

2. A spinning method for a fire-resistant and skin-friendly composite yarn that overcomes residual torque according to claim 1, characterized in that: The soft flame-retardant short fiber strips are polyimide fibers, aramid fibers, polytetrafluoroethylene fibers, or polyphenylene sulfide fibers.

3. The spinning method of the fire-resistant and skin-friendly composite yarn for overcoming residual torque according to claim 1, characterized in that: The high-rigidity filaments are basalt fiber filaments, quartz fiber filaments, ceramic fiber filaments, carbon fiber filaments, or silicon carbide fiber filaments.

4. The spinning method of the fire-resistant and skin-friendly composite yarn that overcomes residual torque according to claim 1, characterized in that: The twist direction when a forward twisting action is applied is S twist, and the twist direction when a reverse twisting action is applied is Z twist; or the twist direction when a forward twisting action is applied is Z twist, and the twist direction when a reverse twisting action is applied is S twist.

5. The spinning method of the fire-resistant and skin-friendly composite yarn that overcomes residual torque according to claim 1, characterized in that: The feeding speed of the soft flame-retardant staple fiber strands is 0.4-1 m / min; the feeding speed of the high-rigidity filaments is 10-30 m / min; the output speed is 10-30 m / min; in the wrapped yarn, the relative feeding distance between a high-rigidity filament and a bundle of soft flame-retardant staple fiber strands is 0-15 mm; the twist coefficient is 150-250, and the twist direction is alternating between S and Z cycles.

6. A fire-resistant and skin-friendly composite yarn that overcomes residual torque and is prepared by the spinning method according to any one of claims 1 to 5.

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