Process for the production of rigid fiber non-crimped composite yarn

Abstract

The application provides a preparation method of rigid fiber non-twist shrinkage composite yarn, which comprises the following steps: firstly, making rigid fiber filaments and flexible fiber filaments to be combined and twisted to obtain rigid fiber composite filaments; secondly, using a transverse unwinding device to output the rigid fiber composite filaments in a directional and constant speed manner, so as to avoid the twist shrinkage phenomenon of the rigid fiber filaments caused by the residual torque of the rigid fiber filaments during unwinding; and thirdly, using a negative pressure cluster spinning method to twist the rigid fiber composite filaments and flexible short fibers again, and ensuring that the twist of the second twisting is equal to the twist of the combined twisting, so as to effectively avoid the bending and breaking of the rigid fiber filaments during the spinning process, the structure damage of the rigid fiber filaments, the phenomenon of exposed hairiness and the influence on the yarn performance. Through the above method, the rigid fiber non-twist shrinkage composite yarn with stable structure, high strength, uniform strip evenness and less hairiness is successfully spun by using the rigid fiber filaments.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rigid fiber spinning, in particular to a preparation method of rigid fiber non-twist and shrinkage composite yarn. BACKGROUND

[0002] In the process of rigid fiber spinning preparation, the rigid fiber itself is hard and brittle, and after being made into yarn, it will cause the fiber to entangle together due to obvious shrinkage. The rigid fiber is not resistant to bending and is easy to break, and the entangled fiber will cause obvious fluffing phenomenon, the yarn structure is damaged, and the yarn strength is damaged. In order to solve the problem of fiber bending and breaking of rigid fiber in the spinning process, the rigid fiber is usually core-spun, and the short fiber is wrapped outside the rigid fiber. However, in order to completely wrap the rigid fiber filament, a sufficient twist is needed when the rigid fiber is wrapped and spun. However, although the fiber filament is completely wrapped, the wrapped rigid fiber filament in the yarn body has been brittle due to the large twist, and cannot play the high performance characteristics of the rigid fiber. The brittle fiber is easy to expose the yarn body and form burrs, which affects the wearability of the yarn.

[0003] In the prior art, the patent document with the application number CN201110242862.1 and the publication date of November 5, 2014, and the name of "spinning method for symmetrically wrapping rigid fiber filament with short fiber bundle" proposes a spinning device including a filament drum and a guide, one roller of the front roller pair of the ring spinning frame is a slotted roller, and a withdrawal roller is arranged between the slotted roller and the guide; the composite yarn obtained by using the above device is obtained by wrapping the short fiber bundle outside the rigid fiber filament. Although the above technical solution can avoid the bending and breaking of the rigid fiber in the spinning process, the twist balance in the spinning method is uncontrollable, because: in the twisting process of the rigid fiber filament, the twisting degree of the rigid fiber filament is difficult to control, which may cause the brittle phenomenon of the rigid fiber filament; secondly, due to the difficulty in maintaining the twist of the rigid fiber filament, the residual torque of the twisted rigid fiber filament, and the composite yarn wrapped by the short fiber may have serious untwisting and twist shrinkage phenomenon, and the yarn structure is unstable.

[0004] Secondly, the patent document with the application number CN202010764123.8, the publication date is August 31, 2021, and the name is "high rigidity brittle fiber material lossless covered yarn and its spinning method and fabric", in which the high rigidity brittle fiber is implemented positive composite twisting under the twist condition lower than the maximum breaking torque of the high rigidity brittle fiber filament, forming a composite core; then the friction spinning technology is used to reverse twist the composite core, and the flexible flame-retardant fiber is covered on the surface of the composite core twisted back in the opposite direction, forming a core-shell structure composite yarn. The technical problem of not realizing the twisting and holding of the high rigidity fiber in the technical scheme exists, which is due to the composite yarn formed by the flexible flame-retardant fiber twisted back in the opposite direction outside the pre-twisted rigid fiber filament through the friction spinning technology. After the reverse twisting and covering treatment, the pre-twisted rigid fiber filament will untwist, and the rigid fiber filament will always remain in a parallel and straight state. The strength of the yarn cannot reach the purpose of twisting and strengthening. At the same time, due to the lack of twist on the surface of the friction spun yarn and the uneven twist, the covered yarn surface fiber is loose and easy to fuzz and pilling. In addition, the composite core with twist contraction is easy to form a dead knot under the ordinary unwinding mode, which damages the mechanical properties of the high rigidity brittle fiber, causes brittle fracture under the action of drafting force, and affects the spinning process.

[0005] Therefore, it is necessary to design an improved preparation method of rigid fiber non-twist contraction composite yarn to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a preparation method of rigid fiber non-twist contraction composite yarn, which can effectively eliminate the residual torque of rigid fiber yarn formation, keep the yarn structure stable, and reasonably wind, store and transport the yarn, so as to meet the actual production needs.

[0007] In order to achieve the above-mentioned purpose of the application, the present application provides a preparation method of rigid fiber non-twist contraction composite yarn, which comprises the following steps:

[0008] S1, first make a flexible fiber filament and a rigid fiber filament respectively unwound from the first flexible filament bobbin and the second rigid fiber filament bobbin, then make the flexible fiber filament and the rigid fiber filament move to the side of the first winding tube under the restriction of the first guide hook by passing through the double-slot guide eyelet and the single-slot guide eyelet in turn, drive the first wire ring on the first ring by the rotation of the first winding tube, and combine and twist the flexible fiber filament and the rigid fiber filament to obtain rigid fiber composite filament with a certain twist, and the rigid fiber composite filament after combined twisting is wound on the first winding tube for standby;

[0009] S2, the first winding bobbin in step S1 is sleeved on the unwinding shaft of the transverse unwinding device, and is fixed by a fixing piston, so as to ensure that the first winding bobbin is fixed on the unwinding shaft, the rigid fiber filament with twist is actively transported by the transverse unwinding device, and the bending stress is reduced; the rigid fiber composite filament and the flexible short fiber are secondarily compounded and twisted by using the negative pressure aggregation spinning method, and the flexible short fiber is wrapped on the surface of the rigid fiber composite filament, so as to obtain the rigid fiber non-shrinkage composite yarn.

[0010] Preferably, in step S2, the process of preparing the rigid fiber non-shrinkage composite yarn by using the negative pressure aggregation spinning method comprises the following steps: the rigid fiber composite filament is introduced into the front nipper through a guide roller, the guide roller can guide the rigid fiber composite filament, at the same time, the flexible short fiber is unwound from the short fiber roving pipe and fed into the horn mouth, and then passes through the rear roller, the middle roller and the front roller in turn, and is fed into the front nipper in parallel with the rigid fiber composite filament, the flexible short fiber is uniformly wrapped on the surface of the rigid fiber composite filament, and moves to the side of the second winding bobbin under the restriction of the second guide hook, the second steel ring on the second steel ring is driven to move by the rotation of the second winding bobbin, the rigid fiber composite filament wrapped with the flexible short fiber is secondarily twisted, and the rigid fiber non-shrinkage composite yarn is prepared, and the rigid fiber non-shrinkage composite yarn is wound on the second winding bobbin.

[0011] Preferably, the twist direction of the rigid fiber composite filament is "S" direction or "Z" direction, and the twist direction of the flexible short fiber is opposite to that of the rigid fiber composite filament.

[0012] Preferably, the twist of the combined twisting is equal to the twist of the secondary twisting, and the twisting directions of the combined twisting and the secondary twisting are opposite.

[0013] Preferably, in step S2, the flexible short fiber is para-aramid fiber, modified flexible flame-retardant short fiber or linear aromatic high-temperature-resistant flame-retardant fiber twisted.

[0014] Preferably, the twist of the flexible short fiber is 400-600 T / m, and the yarn count is 50-70 English.

[0015] Preferably, in step S2, the unwinding speed of the unwinding device is 10-14 m / min, and the unwinding speed is equal to the linear speed of the front roller.

[0016] Preferably, in step S2, the transverse unwinding device comprises a support arm perpendicular to the ground and an unwinding shaft arranged on the upper part of the support arm, one end of the unwinding shaft is fixed on the support arm, and the other end of the unwinding shaft is provided with a fixing piston for fixing the first winding tube on the unwinding shaft, and the wall surface of the support arm is provided with an unwinding speed adjusting switch and a device switch.

[0017] Preferably, in step S1, the rigid fiber filament is one of carbon fiber, basalt fiber, glass fiber and metal fiber.

[0018] Preferably, the bottom of the support arm is further provided with a magnetic base, and the cross section of the magnetic base is in the shape of "T".

[0019] The beneficial effects of the present application are:

[0020] 1. The preparation method of the rigid fiber non-twist shrinkage composite yarn provided by the present application first combines and twists the rigid fiber filament and the flexible fiber filament to obtain rigid fiber composite filament, then uses a transverse unwinding device to output the rigid fiber composite filament in a directional and constant speed manner to avoid the twist shrinkage of the rigid fiber filament after twisting treatment, and then uses a negative pressure cluster spinning method to twist the rigid fiber composite filament again, and ensures that the twist of the second twisting is equal to the twist of the combined twisting, thereby effectively avoiding the bending and breaking of the rigid fiber filament during the spinning process, which damages the structure of the rigid fiber filament and causes the phenomenon of exposed hair, affecting the performance of the yarn. Through the above-mentioned manner, the rigid fiber non-twist shrinkage composite yarn with stable structure, high strength, uniform strip, and less hair is successfully spun by using the rigid fiber filament.

[0021] 2. The preparation method of the rigid fiber non-twist shrinkage composite yarn provided by the present application sets a transverse unwinding device to output the rigid fiber composite filament obtained after combined twisting in a directional and constant speed manner to avoid the twist shrinkage of the rigid fiber composite filament during unwinding, which damages the structure of the rigid fiber filament. At the same time, when the flexible short fibers are wrapped around the surface of the rigid fiber composite filament in the subsequent negative pressure cluster spinning, the twisting direction in the second twisting process balances the torque of the rigid fiber filament after combined twisting, so that after wrapping the flexible short fibers, no twist shrinkage occurs, and the stable structure is still maintained, which protects the rigid fiber filament during the spinning process and avoids the damage to the structure of the rigid fiber filament. Secondly, the two opposite direction twisting methods can balance the torque of the rigid fiber filament after twisting to give it a certain twist on the premise of not damaging the rigid fiber filament, so as to enhance the mechanical strength of the composite yarn.

[0022] 3. The method for preparing rigid fiber untwisted composite yarn provided by the present invention ensures that the rigid fiber composite filament remains straight by making the unwinding speed equal to the linear speed of the front roller, thus preventing the rigid fiber filament from shrinking back. This ensures that the twist and structure of the rigid fiber composite filament are not changed or damaged after unwinding, and guarantees the stability of the rigid fiber filament structure. By designing the winding bobbin to be twice the size of a conventional bobbin, damage to the rigid fiber filament or composite yarn is avoided during the winding process. This also prevents the rigid fiber filament from breaking brittlely due to collisions and friction during transportation and use, which would cause exposed fuzz and a burr-like feel, damaging the yarn's structure and strength. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the apparatus for twisting rigid fiber filaments during the preparation of rigid fiber untwisted shrinkage composite yarn in Embodiment 1 of the present invention.

[0024] Figure 2 This is a schematic diagram of the device used for secondary twisting in the preparation of rigid fiber untwisted composite yarn according to Embodiment 1 of the present invention;

[0025] Figure 3 for Figure 2 A schematic diagram of the transverse unwinding device in the middle;

[0026] Figure 4 for Figure 2 A schematic diagram of the guide wheel in the middle;

[0027] Figure 5 An optical photograph of the rigid fiber untwisted composite yarn obtained in Example 1 of the present invention;

[0028] The attached figures are labeled as follows:

[0029] 1. First flexible fiber filament spool; 2. Double-groove guide roller; 3. Single-groove guide roller; 4. First winding bobbin; 5. Second rigid fiber filament spool; 6. First guide hook; 7. Lateral unwinding device; 8. Guide roller; 9. Front roller; 10. Second winding bobbin; 11. Short fiber roving tube; 12. Rear roller; 13. Middle roller; 14. Unwinding shaft; 15. Unwinding speed adjustment switch; 16. Device switch; 17. Magnetic base; 18. Fixed piston; 19. Support arm; 20. Threaded shaft; 21. Rolling shaft. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] It should be noted that, in order not to obscure the present application with unnecessary details, only the structures and / or processing steps closely related to the present application are shown in the drawings, and other details not closely related to the present application are omitted.

[0032] In addition, it should be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device.

[0033] Please refer to Figures 1 to 4 The present application provides a preparation method of a rigid fiber non-shrinkage composite yarn, comprising the following steps:

[0034] S1, first make a flexible fiber filament and a rigid fiber filament respectively from the first flexible fiber filament reel 1 and the second rigid fiber filament reel 5, then pass through the double-slot guide 2 and the single-slot guide 3 in turn, under the restriction of the first guide hook 6, the two fiber filaments move to the side of the first winding drum 4, the rotation of the first winding drum 4 drives the first wire ring on the first ring to move, and the two fiber filaments are combined and twisted to obtain rigid fiber composite filaments with a certain twist, and the rigid fiber composite filaments after the above combined twisting are wound on the first winding drum 4 for standby;

[0035] S2, the first winding drum 4 wound with the rigid fiber composite filaments in step S1 is sleeved on the unwinding shaft 14 of the transverse unwinding device 7 and fixed by the fixed piston 18, to ensure that the first winding drum 4 is fixed on the unwinding shaft 14, the rigid fiber composite filaments are actively transported by the transverse unwinding device 7, the unwound rigid fiber composite filaments are secondly twisted by the method of negative pressure gathering spinning, and the flexible short fibers are wrapped on the surface of the rigid fiber composite filaments to obtain the rigid fiber non-shrinkage composite yarn.

[0036] Preferably, the twist degree of the combined twisting in step S1 is equal to the twist degree of the second twisting in step S2.

[0037] Preferably, in step S1, the rigid fiber filament is carbon fiber, basalt fiber, glass fiber, metal fiber or the like.

[0038] Preferably, the size of the first winding bobbin 4 and the second winding bobbin 10 is 2 times of the conventional winding bobbin, and the size of the first ring and the second ring is also adjusted according to the size of the first winding bobbin 4 and the second winding bobbin 10; with this arrangement, the bending degree of the rigid fiber filament or the composite yarn during winding can be reduced, the structure of the rigid fiber filament during spinning processing is protected from damage, and the stability of the finally prepared composite yarn structure is ensured.

[0039] Specifically, in step S2, the process of preparing the rigid fiber untwisted composite yarn by using the negative pressure aggregation spinning method includes the following steps: the untwisted rigid fiber composite filament is introduced into the front nipper through the guide roller 8, the guide roller 8 can guide the rigid fiber composite filament, avoiding the bending phenomenon of the fiber filament after the rigid fiber composite filament with a certain twist is unwound from the transverse unwinding device 7, to ensure that the form of the rigid fiber composite filament is changed as little as possible during spinning, the guide roller 8 can rotate around the rolling shaft 21 inside it, at the same time, the flexible short fibers are unwound from the short fiber roving pipe 11, fed into the horn mouth, and sequentially pass through the back roller 12, the middle roller 13, and the front roller 9 to hold and stretch, and are fed into the front nipper in parallel with the rigid fiber composite filament, the flexible short fibers are uniformly wrapped on the surface of the rigid fiber composite filament, and under the restriction of the second guide hook, the flexible short fibers move to the side of the second winding bobbin 10, the second steel ring on the second ring is driven to move by the rotation of the second winding bobbin 10, the rigid fiber composite filament is twisted again, and the rigid fiber untwisted composite yarn is prepared, and the yarn is wound on the second winding bobbin 10.

[0040] Preferably, in step S2, the flexible short fibers are linear aromatic high-temperature-resistant flame-retardant fibers such as meta-aramid or polyimide, polyamide, polybenzimidazole (PBI), poly-p-phenylene-benzobisoxazole (PBO), polyphenylene sulfide (PPS), polyaryl sulfone amide (PSA), and modified flexible flame-retardant fibers such as polytetrafluoroethylene, flame-retardant viscose, and flame-retardant vinylon, which are obtained by twisting, and the twist of the flexible short fibers is 400-600T / m, and the yarn count is 50-70 English.

[0041] Preferably, in step S2, the twist direction of the rigid fiber composite filament is “S” or “Z”, and the twist direction of the flexible short fiber is opposite to that of the rigid fiber composite filament.

[0042] Preferably, in step S2, the unwinding speed of the unwinding device is 10-14 m / min, and the unwinding speed is equal to the linear speed of the front roller 9, which ensures that the rigid fiber composite filament always remains in a straight state and avoids the shrinkage of the rigid fiber filament, so that the twist and structure of the rigid fiber composite filament after unwinding are not changed and damaged, and the stability of the rigid fiber filament structure is ensured.

[0043] Preferably, in step S2, the godet wheel 8 is provided with a rotatable rolling shaft 21, and the godet wheel 8 is provided with threaded shafts 20 at both ends to facilitate the installation of the godet wheel 8 on the cradle.

[0044] Preferably, in step S2, the transverse unwinding device 7 includes a support arm 19 perpendicular to the ground and an unwinding shaft 14 arranged on the upper part of the support arm 19, one end of the unwinding shaft 14 is fixed on the support arm 19, and the other end is provided with a fixing piston 18 for fixing the first winding bobbin 4 on the unwinding shaft 14, the wall surface of the support arm 19 is provided with an unwinding speed adjusting switch 15 and a device switch 16; in particular, the bottom of the support arm 19 is provided with a magnetic base 17, the cross section of the magnetic base 17 is "T-shaped", so as to endow the support arm 19 with magnetism and ensure the stability of the transverse unwinding device 7.

[0045] The preparation method of the rigid fiber non-shrinkage composite yarn of the present application will be further described below in combination with specific examples:

[0046] Example 1

[0047] In this embodiment, a rigid fiber non-shrinkage composite yarn is prepared, and the specific preparation method includes the following steps:

[0048] S1, first make a carbon fiber filament and soluble vinylon respectively unwound from the first flexible fiber filament bobbin 1 and the second rigid fiber filament bobbin 5, both of which pass through the double-slot godet wheel 2 and the single-slot godet wheel 3 in turn, and under the restriction of the first godet hook 6, move to the side of the first winding bobbin 4, driven by the rotation of the first winding bobbin 4, the first steel ring on the first steel ring moves, and the carbon fiber filament and the soluble vinylon are combined and twisted to obtain a rigid fiber composite filament with a twist of 500T / m, and the rigid fiber composite filament after the above twisting treatment is wound on the first winding bobbin 4 for standby;

[0049] S2, the rigid fiber composite filament with a twist of 500 T / m on the first winding bobbin 4 in step S1 is sleeved on the unwinding shaft 14 of the transverse unwinding device 7 and is fixed by the fixed piston 18, ensuring that the winding drum of the rigid fiber composite filament is fixed on the unwinding shaft 14; the rigid fiber composite filament unwound from the winding drum is guided into the front nip by the guide roller 8, the guide roller 8 can guide the rigid fiber composite filament, avoiding the bending phenomenon of the fiber filament after the rigid fiber composite filament is unwound from the transverse unwinding device 7, so as to ensure that the shape of the rigid fiber filament changes as little as possible during the spinning process; the guide roller 8 can rotate around the rolling shaft 21 inside it, at the same time, the flexible short fibers made of meta-aramid are unwound from the short fiber roving pipe 11, fed from the horn mouth, and sequentially pass through the back roller 12, the middle roller 13, and the front roller 9 to hold and stretch, and are fed into the front nip in parallel with the rigid fiber composite filament, the flexible short fibers are uniformly covered on the surface of the rigid fiber composite filament, and move to the side of the second winding bobbin 10 under the restriction of the second guide hook, the rotation of the second winding bobbin 10 drives the second wire ring on the second steel ring to move, and drives the rigid fiber composite filament to be twisted again, the twist of the second twist is equal to the twist of the combined twist, both are 500 T / m, a rigid fiber untwist and shrink yarn with a yarn count of 30 English is prepared, and the yarn is wound on the second winding bobbin 10. In this embodiment, the diameter of the guide roller 8 is 8 cm, and the length of the rolling shaft 21 is 7 cm; the unwinding speed of the unwinding device is 12 m / min; the twist of the flexible short fiber is 500 T / m, and the yarn count is 60 English. The optical photograph of the rigid fiber untwist and shrink composite yarn prepared in this embodiment is shown in Figure 5 As can be seen from the figure, the surface structure of the composite yarn is uniform and has less hair.

[0050] Examples 2 to 4

[0051] Examples 2 to 4 are different from Example 1 in that the parameter settings of the preparation process are different from those of Example 1, and the other steps are basically the same as those of Example 1, which will not be repeated here. The strength of the rigid fiber untwist and shrink composite yarn prepared under different experimental conditions is shown in Table 1. The results show that the method proposed in the present application can prepare rigid fiber untwist and shrink composite yarn with excellent performance from carbon fiber, basalt fiber, glass fiber and other rigid fiber filaments.

[0052] Table 1. Parameter settings of Examples 1 to 3 and strength of rigid fiber untwist and shrink composite yarn prepared under different experimental conditions

[0053]

[0054] Comparative Example 1

[0055] The difference between Comparative Example 1 and Example 1 is only that the transverse orientation and constant speed output of the combined and twisted rigid fiber filaments is not provided by the transverse unwinding device 7, but the combined and twisted rigid fiber filaments are directly prepared into rigid fiber untwisted shrinkage composite yarns together with the flexible short fibers, and other steps are basically the same as those of Example 1 and will not be repeated here. The spinning process of Comparative Example 1 and Comparative Example 1 shows that the method of Example 1 can unwind the rigid fiber composite filaments smoothly, and the yarns prepared do not have twist shrinkage phenomenon, while in the method of Comparative Example 1, the composite filaments produce dead knots in the unwinding process, form long thick nodes, and even entangle and break, which cannot be continuously spun.

[0056] Comparative Example 2

[0057] The difference between Comparative Example 2 and Example 1 is only that in step S2, the composite yarn is not prepared by using the negative pressure aggregation spinning method, but the flexible short fibers are coated on the surface of the rigid fiber filaments by using the conventional twisting method, and other steps are basically the same as those of Example 1 and will not be repeated here. The performance comparison of the rigid fiber untwisted shrinkage composite yarns prepared by Example 1 and Comparative Example 2 is shown in Table 2, and it can be seen from Table 2 that the yarn prepared by Example 1 shows higher strength than that of Comparative Example 2; the surface performance of the yarn prepared by Example 1 and Comparative Example 2 shows that the yarn prepared by Example 1 does not have twist shrinkage phenomenon, and the hairiness of Comparative Example 2 is more and the evenness is poorer, which is mainly because: in Example 1, the rigid fiber filaments and the flexible fiber filaments are first combined and twisted, and then the transverse unwinding device is used for directional and constant speed output, and then the negative pressure aggregation spinning method is used for secondary twisting to realize the spinning processing of the rigid fiber filaments. The above processing method can effectively avoid the twist shrinkage of the rigid fiber filaments in the processing process, so as to ensure that the structure of the finally prepared yarn is stable and has high strength.

[0058] Table 2 Performance comparison of rigid fiber untwisted shrinkage composite yarns prepared by Example 1 and Comparative Example 2

[0059]

[0060] To sum up, the preparation method of the rigid fiber non-twist and shrinkage composite yarn provided by the application avoids the twist shrinkage phenomenon of the rigid fiber filaments due to the residual torque of the rigid fiber filaments during unwinding by first performing the combined twisting treatment on the rigid fiber filaments, then outputting the rigid fiber filaments at a constant speed in a certain direction by using the transverse unwinding device, and then performing the secondary twisting on the rigid fiber filaments by using the negative pressure condensing spinning method, and ensuring that the twist of the combined twisting is equal to the twist of the secondary twisting, so as to effectively avoid the bending and breaking of the rigid fiber filaments during the spinning process, which causes the structure of the rigid fiber filaments to be damaged, the phenomenon of exposed hairiness to occur, and the yarn performance to be affected. By the above-mentioned manner, the rigid fiber non-twist and shrinkage composite yarn with stable structure, high strength, uniform strip evenness and less hairiness is successfully spun by using the rigid fiber filaments.

[0061] The above examples are only used to illustrate the technical solutions of the application and not limit the application. Although the application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the application.

Claims

1. A method of making a rigid fiber non-crimped composite yarn, characterized by, It comprises the following steps: S1, firstly, a flexible fiber filament and a rigid fiber filament are unwound from a first flexible filament bobbin and a second rigid fiber filament bobbin respectively, then the flexible fiber filament and the rigid fiber filament pass through a double-slot guide groove and a single-slot guide groove in turn, and under the restriction of a first guide hook, move to the side of a first winding tube, the rotation of the first winding tube drives the first wire ring on the first ring to move, the flexible fiber filament and the rigid fiber filament are combined and twisted, a rigid fiber composite filament with a certain twist is obtained, and the rigid fiber composite filament after combined twisting is wound on the first winding tube for standby; S2, the first winding tube in step S1 is sleeved on the unwinding shaft of a transverse unwinding device, and is fixed by a fixed piston, so as to ensure that the first winding tube is fixed on the unwinding shaft, the transverse unwinding device is used to actively transport the rigid fiber filament with a certain twist, so as to reduce the bending stress, and the rigid fiber composite filament and the flexible short fiber are secondly combined and twisted by using the method of negative pressure cluster spinning, and the flexible short fiber is wrapped on the surface of the rigid fiber composite filament, so as to obtain the rigid fiber non-shrinkage composite yarn, the transverse unwinding device comprises a support arm perpendicular to the ground and an unwinding shaft arranged on the upper part of the support arm, one end of the unwinding shaft is fixed on the support arm, the other end of the unwinding shaft is provided with a fixed piston for fixing the first winding tube on the unwinding shaft, and the wall surface of the support arm is provided with an unwinding speed adjusting switch and a device switch; In step S2, the process of preparing the rigid fiber non-shrinkage composite yarn by using the method of negative pressure cluster spinning comprises the following steps: the rigid fiber composite filament is introduced into the front nip through a guide groove, the guide groove can guide the rigid fiber composite filament, at the same time, the flexible short fiber is unwound from a short fiber roving pipe and fed into a horn mouth, and then passes through a rear roller, a middle roller and a front roller in turn, is held and stretched, and is fed into the front nip in parallel with the rigid fiber composite filament, the flexible short fiber is uniformly wrapped on the surface of the rigid fiber composite filament, and under the restriction of a second guide hook, moves to the side of a second winding tube, the rotation of the second winding tube drives the second wire ring on the second ring to move, the rigid fiber composite filament wrapped with the flexible short fiber is secondly twisted, and the rigid fiber non-shrinkage composite yarn is prepared, and the rigid fiber non-shrinkage composite yarn is wound on the second winding tube.

2. The method of claim 1, wherein the rigid fiber non-crimped composite yarn is prepared by the steps of: The twist direction of the rigid fiber composite filament is "S" direction or "Z" direction, and the twist direction of the flexible short fiber is opposite to that of the rigid fiber composite filament.

3. The method of claim 1, wherein the rigid fiber non-crimped composite yarn is prepared by the steps of: The twist of the combined twisting is equal to that of the second twisting, and the twisting directions of the combined twisting and the second twisting are opposite.

4. The method of claim 1, wherein the rigid fiber non-crimped composite yarn is prepared by the steps of: In step S2, the flexible short fiber is a linear aromatic high-temperature resistant flame-retardant fiber twisted.

5. The method of claim 4, wherein the rigid fiber non-crimped composite yarn is prepared by the steps of: The twist of the flexible short fiber is 400-600 T / m, and the yarn count is 50-70 English.

6. The method of claim 1, wherein the rigid fiber non-crimped composite yarn is prepared by the steps of: In step S2, the unwinding speed of the unwinding device is 10-14 m / min, and the unwinding speed is equal to the linear speed of the front roller.

7. The method for preparing rigid fiber untwisted composite yarn according to claim 1, characterized in that, In step S1, the rigid fiber filament is one of carbon fiber, basalt fiber, glass fiber and metal fiber.

8. The method of claim 1, wherein the rigid fiber non-crimped composite yarn is prepared by the steps of: The bottom of the support arm is also provided with a magnetic base, and the cross section of the magnetic base is in the shape of "T".

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