A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn

Abstract

The present invention discloses a spinning method for rotor-spun polyimide / hemp antibacterial blended yarn. The rotor-spun polyimide / hemp antibacterial blended yarn is produced by feeding, combing, coagulating, and twisting polyimide / hemp blended fiber strips through a rotor spinning process. The fibers are treated with high-temperature steam during the twisting process, and the high-temperature steam temperature is not less than 120°C. The method of the present invention solves the problems of low twisting efficiency and high electrostatic effects in rotor-spun polyimide and hemp fiber blended yarn. The polyimide / hemp antibacterial blended yarn of the present invention has high breaking strength, good yarn uniformity, a smooth yarn surface, low hairiness, and excellent antibacterial and antimicrobial effects. It can be used in the field of fabrics such as clothing and underwear.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning and relates to a rotor spinning method, in particular to a rotor spinning method for polyimide / hemp antibacterial blended yarn. Background Art

[0002] Polyimide fiber is a high-performance fiber containing an imide ring structure in its backbone. It exhibits properties such as high modulus, thermal stability, radiation resistance, high and low temperature resistance, chemical corrosion resistance, and biocompatibility. It is widely used in aerospace, defense, sports equipment, textiles, and apparel. In recent years, the application of polyimide fiber has become increasingly widespread, while retaining its original properties. Existing research results show that when polyimide fiber is used in textiles and apparel, it not only imparts excellent warmth and flame retardancy but also exhibits excellent antibacterial properties. Although the mechanism of polyimide's antibacterial properties is currently unclear, authoritative testing has shown that polyimide fiber has an inhibitory effect against 154 common bacterial species. However, due to its unique molecular structure, polyimide has poor spinnability. In particular, static electricity is easily generated when it comes into contact with the carding and drafting components during spinning, resulting in card wrapping during carding, and a high number of knots generated by the carding components.

[0003] Hemp fiber is a naturally antimicrobial fiber with excellent properties such as antibacterial and mildew-proofing, moisture wicking, UV resistance, and antistatic properties. Hemp fiber is a bundled fiber with poor length uniformity, surface gaps, and uneven fineness. Its unique hollow structure, rich in oxygen and connected to surface cracks and holes, gives the fiber excellent moisture wicking, breathability, and antibacterial properties. However, due to its poor length uniformity and stiffness, hemp fiber spinning requires high temperature and humidity requirements. During the twisting process, hemp fiber typically requires higher temperatures and humidity to facilitate the transfer of fibers in and out of the yarn, thereby improving twisting efficiency, enhancing yarn strength and elongation, and reducing yarn hairiness and other physical and mechanical properties.

[0004] Rotor spinning is the most mature spinning method currently developed besides ring spinning. It features high spinning speeds, a short process flow, and a wide range of raw material lengths and applicability. The principle of rotor spinning is that the fiber strips are first combed by a combing roller into a single fiber state. Under the action of negative pressure airflow, the fiber flow in the single fiber state is transferred through the fiber transport channel to the rotor, where it is twisted into yarn under the combined action of the rotor and false twist disk. Currently, when using rotor spinning for polyimide fibers, due to the poor spinnability of polyimide, it is very easy to cause yarn to wrap around the combing roller needle teeth during spinning, resulting in frequent knotting and breakage. Therefore, polyimide fibers are usually blended with other fibers. Since both hemp fiber and polyimide fiber have antibacterial properties, polyimide fiber and hemp fiber are mixed in a certain proportion. The resulting yarn not only has antibacterial and antibacterial properties, but also has the excellent physical and mechanical properties of polyimide fiber yarn, such as good strength, warmth retention, and flame retardancy, and the moisture absorption, perspiration removal, and breathability of hemp fiber yarn. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art and provide a spinning method for rotor-spun polyimide / hemp antibacterial blended yarn.

[0006] In order to solve the above-mentioned problems, the technical solutions of the present invention are as follows:

[0007] A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn comprises feeding, combing, agglomerating, and twisting polyimide / hemp blended fiber strips through a rotor spinning process to produce the rotor-spun polyimide / hemp antibacterial blended yarn. During the twisting process, high-temperature steam is used to treat the fibers (the high-temperature steam treats the fibers when the fiber strands agglomerated in the rotor move to the surface of a false twist disk during the process of being twisted and drawn out of the rotor, and the fiber aggregation form at this time is a state between the fiber strands and the yarn). The temperature of the high-temperature steam is not lower than 120°C. If the temperature is too low, it is not conducive to improving the twisting efficiency and the effect is not obvious.

[0008] As the preferred technical solution:

[0009] In the above-mentioned rotor spinning method of polyimide / hemp antibacterial blended yarn, the temperature of the high-temperature steam is not higher than 150°C. If the temperature is too high, the energy consumption is high and the requirements for other spinning components are high. The relative humidity of the high-temperature steam is 80-90%.

[0010] A spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn as described above, wherein the twisting and yarn formation relies on the combined action of the rotor, the false twist disc and the yarn delivery roller;

[0011] The false twist disc is composed of an inner shell and an outer shell; the inner shell is nested in the outer shell, and the two enclose a closed hollow chamber; the inner shell is composed of a coaxial trumpet-shaped upper section and a hollow cylindrical lower section, the large end of the upper section is at the top and the small end is at the bottom, and the inner diameter of the small end of the upper section is the same as the inner diameter of the lower section;

[0012] The upper section of the inner shell is provided with 20 to 30 circular holes that penetrate and communicate with the hollow chamber. The number of circular holes is related to the uniform distribution of high-temperature steam and the twisting effect of the false twisting disc. The effect is better within this range.

[0013] The lower portion of the shell is connected to a vent pipe, and the vent pipe is connected through the hollow chamber;

[0014] The high-temperature steam is used to treat the fibers during the twisting process to form yarns, and this is achieved by transporting the high-temperature steam into the hollow chamber through the ventilation pipe.

[0015] As described above, in a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn, the inner radius of the large end of the upper section of the inner shell is 9 to 10 mm, the inner radius of the small end of the upper section of the inner shell is 1 to 2 mm, and the radius of the circular hole is 0.25 to 0.5 mm; the above three limitations on the size parameters of the false twist disk are based on the structural dimensions of the existing rotor spinning device, which is convenient for installation on the existing rotor spinning device. When it exceeds or falls below this range, it is not conducive to installation and the false twist effect of the false twister will also be affected.

[0016] In the spinning method of the polyimide / hemp antibacterial blended yarn of the rotor spinning as described above, the length of the upper section of the inner shell is 4 to 5 mm, and the wall thickness is 0.5 to 1 mm; the length of the lower section of the inner shell is 15 to 20 mm, and the wall thickness is 0.5 to 1 mm; the above four limitations on the size parameters of the false twist disk are based on the structural dimensions of the existing rotor spinning device, which is convenient for installation on the existing rotor spinning device. When it exceeds or falls below this range, it is not conducive to installation, and the false twist effect of the false twister will also be affected.

[0017] As described above, a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn, the outer shell consists of an upper part and a lower part, the upper part and the lower part of the outer shell are both hollow cylindrical and coaxial; the inner diameter of the upper part of the outer shell is equal to the outer diameter of the large end of the upper section of the inner shell; the length of the upper part of the outer shell is 4-5 mm, and the wall thickness is 0.5-1 mm; the inner diameter of the lower part of the outer shell is 5-6 mm, the length is 15-20 mm, and the wall thickness is 0.5-1 mm; the above five limitations on the size parameters of the false twist disk are based on the structural dimensions of the existing rotor spinning device, which is convenient for installation on the existing rotor spinning device. When it exceeds or falls below this range, it is not conducive to installation and the false twist effect of the false twister will also be affected.

[0018] In the above-mentioned rotor-spinning method for polyimide / hemp antibacterial blended yarn, the connection point between the vent tube and the lower part of the shell is marked as point A, and the distance between point A and the upper part of the shell is 20 to 30% of the length of the lower part of the shell; the parameter is set within this range and is related to the structure of the spinning unit itself. This position is conducive to the installation of the false twist disk.

[0019] In the spinning method of the above-mentioned rotor-spun polyimide / hemp antibacterial blended yarn, the inner diameter of the vent pipe is 3 to 4 mm and the wall thickness is 0.5 to 1 mm; the vent pipe is connected to a regulating device, and the regulating device is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe. The flow rate of the high-temperature water vapor entering the vent pipe is 0.0005 to 0.001 m 3 / s.

[0020] In the above-mentioned rotor-spinning method for polyimide / hemp antibacterial blended yarn, the material of the inner shell is stainless steel or ceramic.

[0021] As described above, a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn adopts a combing roller with a rotation speed of 5000-6000 r / min; the rotation speed of the combing roller affects the combing effect of the fiber. Setting the rotation speed within this range can avoid the problem of insufficient fiber combing when the combing roller speed is low, and the problem of large fiber damage caused by the high rotation speed of the combing roller. The high rotation speed of the combing roller will also cause the polyimide fiber to wrap around the needle cloth; the rotation speed of the rotor is 50000-100000 r / min; the speed of the rotor is related to the output and the stability of the spinning quality. Setting the rotation speed within this range can avoid the problem of too high rotor speed, resulting in a high yarn breakage rate and unstable yarn quality, and the problem of too low rotor speed, low spinning speed, which is not conducive to increasing output.

[0022] As described above, a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn is provided, wherein the mass ratio of polyimide fiber to hemp fiber in the polyimide / hemp blended fiber strip is 80-90:20-10. Controlling the two fibers within this blending ratio range can ensure that the yarn has good strength, elongation, and good spinnability.

[0023] As described above, a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn is provided, and the preparation process of the polyimide / hemp mixed fiber strips is as follows: the polyimide fibers are opened and carded into strips to form polyimide fiber strips, while the hemp fibers are opened and carded into strips to form hemp fiber strips, and then the polyimide fiber strips and the hemp fiber strips are subjected to two drawing processes to form polyimide / hemp mixed fiber strips.

[0024] As described above, in a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn, the quantitative weight of the polyimide fiber strips is 15 to 20 g / 5 m, and the quantitative weight of the hemp fiber strips is 8 to 10 g / 5 m. These two quantitative weights are related to the blending ratio of the two fibers. The proportion of polyimide fiber is high, so the quantitative weight of its pure fiber strips is large.

[0025] According to the spinning method of the rotor-spun polyimide / hemp antibacterial blended yarn as described above, the specific process of subjecting the polyimide fiber strips and the hemp fiber strips to two drawing processes to make the polyimide / hemp mixed fiber strips is: first, the polyimide fiber strips and the hemp fiber strips are subjected to a first drawing process to make mixed semi-cooked strips, and then the mixed semi-cooked strips are subjected to a second drawing process to make the polyimide / hemp mixed fiber strips; the number of roots drawn in the first drawing process is 6 or 8, and the quantitative weight of the mixed semi-cooked strips is 18 to 20 g / 5 m, the number of roots drawn in the second drawing process is 6 or 8, and the quantitative weight of the polyimide / hemp mixed fiber strips is 15 to 22 g / 5 m.

[0026] As described above, a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn, wherein the polyimide fiber is a polyimide fiber treated with an antistatic oil agent, the antistatic oil agent is a mixture of oil and water in a mass ratio of 1:9, and the oil agent is composed of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier.

[0027] In the above-mentioned rotor-spinning method for polyimide / hemp antibacterial blended yarn, the antistatic oil treatment time is 18 to 24 hours.

[0028] A spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn as described in any of the above items, wherein the rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 14-18 cN / tex, a hairiness index of 5-10 yarns / m, a yarn evenness of 10-15%, an antibacterial rate against Candida albicans after 18 hours of 85-90%, an antibacterial rate against Escherichia coli after 18 hours of 88-93%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 97-99.9%. The antibacterial rate test of the present invention refers to the standard GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles - Part 3: Oscillation Method".

[0029] The mechanism of the present invention is as follows:

[0030] The spinning method of the rotor-spun polyimide / hemp antibacterial blended yarn of the present invention can be more conducive to the inward and outward transfer of the polyimide and hemp mixed fiber strands during twisting by subjecting them to the action of high-temperature water vapor on the twisting path during spinning, which is more conducive to yarn formation; the action of the high-temperature water vapor can also have a twist-fixing effect on the twisted yarn, and the twist of the spun yarn is more stable; the high-temperature water vapor will flow into the rotor under the action of the negative pressure airflow, thereby changing the temperature and humidity environment in the rotor during spinning, which is more suitable for the spinning of hemp fibers and is conducive to reducing the static electricity phenomenon during polyimide spinning; and the rotor-spun polyimide / hemp antibacterial blended yarn of the present invention performs antistatic treatment on the polyimide fiber, which greatly reduces the static electricity phenomenon of the polyimide fiber and is more conducive to the smooth progress of the spinning process.

[0031] Beneficial effects

[0032] The invention discloses a spinning method for a rotor-spun polyimide / hemp antibacterial blended yarn, which solves the problems of low twisting efficiency and large electrostatic effect in rotor-spun polyimide and hemp fiber blended yarn. The polyimide / hemp antibacterial blended yarn has high breaking strength, good yarn uniformity, smooth yarn surface, less hairiness, and good antibacterial and antimicrobial effects, and can be used in fabric fields such as clothing and underwear. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic cross-sectional view of a false twist disc of the present invention;

[0034] Figure 2 It is a schematic diagram of a false twist disk of the present invention;

[0035] Among them, 1-inner shell, 2-outer shell, 3-hollow chamber, 4-trumpet-shaped upper section, 5-hollow cylindrical lower section, 6-circular hole, 7-ventilation pipe. DETAILED DESCRIPTION

[0036] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0037] Example 1

[0038] A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn, comprising the following steps:

[0039] (1) Preparation of polyimide / hemp mixed fiber strips;

[0040] The polyimide fiber is opened and carded into strips to prepare polyimide fiber strips with a basis weight of 15g / 5m, and the hemp fiber is opened and carded into strips to prepare hemp fiber strips with a basis weight of 8g / 5m. The polyimide fiber strips and the hemp fiber strips are then subjected to a first drawing process to prepare mixed semi-ripened strips with a basis weight of 18g / 5m, the number of strands of which is drawn in the first drawing process being 6. The mixed semi-ripened strips are then subjected to a second drawing process to prepare polyimide / hemp mixed fiber strips with a basis weight of 15g / 5m, the number of strands of which is drawn in the second drawing process being 6.

[0041] The polyimide fiber is a polyimide fiber treated with an antistatic oil for 18 hours, the antistatic oil is a mixture of oil and water in a mass ratio of 1:9, and the oil consists of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier;

[0042] The mass ratio of the polyimide fiber strips to the hemp fiber strips in the polyimide / hemp mixed fiber strips is 80:20;

[0043] (2) feeding, combing, coagulating, and twisting the polyimide / hemp mixed fiber strips through a rotor spinning process to obtain rotor-spun polyimide / hemp antibacterial blended yarn, wherein the fibers are treated with high-temperature steam during the twisting process, wherein the temperature of the high-temperature steam is 120° C. and the relative humidity is 80%;

[0044] Among them, the combing roller with a rotation speed of 5000r / min is used for combing;

[0045] Twisting into yarn relies on the joint action of rotor, false twist disc and yarn delivery roller;

[0046] The rotating speed of the rotor is 50000r / min;

[0047] like Figures 1-2 As shown, the false twist disc consists of an inner shell 1 and an outer shell 2;

[0048] The inner shell 1 is placed inside the outer shell 2, and the two shells form a closed hollow chamber 3.

[0049] The inner shell 1 is made of stainless steel and consists of a coaxial trumpet-shaped upper section 4 and a hollow cylindrical lower section 5. The upper section of the inner shell 1 is 4 mm long and 0.5 mm thick; the lower section of the inner shell 1 is 15 mm long and 0.5 mm thick. The upper section of the inner shell 1 has a large end at the top and a small end at the bottom. The inner radius of the large end of the upper section is 9 mm, and the inner radius of the small end of the upper section is 1 mm. The inner diameter of the small end of the upper section is the same as that of the lower section. The upper section of the inner shell 1 has 20 circular holes 6 with a radius of 0.25 mm distributed throughout the hollow chamber 3.

[0050] The outer shell 2 consists of an upper portion and a lower portion, both of which are hollow cylindrical and coaxial. The inner diameter of the upper portion of the outer shell 2 is equal to the outer diameter of the larger end of the upper section of the inner shell 1. The length of the upper portion of the outer shell 2 is 4 mm and the wall thickness is 0.5 mm. The inner diameter of the lower portion of the outer shell 2 is 5 mm, the length is 15 mm, and the wall thickness is 0.5 mm.

[0051] The lower portion of the housing 2 is connected to a vent tube 7, which penetrates and communicates with the hollow chamber 3. The vent tube 7 has an inner diameter of 3 mm and a wall thickness of 0.5 mm. The connection point between the vent tube 7 and the lower portion of the housing 2 is designated as point A. The distance between point A and the upper portion of the housing 2 is 20% of the length of the lower portion of the housing 2.

[0052] The vent pipe 7 is connected to a regulating device, which is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe 7. The flow rate of the high-temperature water vapor entering the vent pipe 7 is 0.0005m 3 / s;

[0053] The high-temperature steam is used to treat the fibers during twisting into yarns by transporting the high-temperature steam into the hollow chamber 3 through the vent pipe 7 .

[0054] The final rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 14 cN / tex, a hairiness index of 6 yarns / m, a yarn uniformity of 10.5%, an antibacterial rate against Candida albicans after 18 hours of 85%, an antibacterial rate against Escherichia coli after 18 hours of 90%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 98%.

[0055] Example 2

[0056] A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn, comprising the following steps:

[0057] (1) Preparation of polyimide / hemp mixed fiber strips;

[0058] The polyimide fiber is opened and carded into strips to prepare polyimide fiber strips with a basis weight of 16 g / 5 m, and the hemp fiber is opened and carded into strips to prepare hemp fiber strips with a basis weight of 9 g / 5 m. The polyimide fiber strips and the hemp fiber strips are then subjected to a first drawing process to prepare mixed semi-ripened strips with a basis weight of 18 g / 5 m, the number of strands of which is drawn in the first drawing process being 6. The mixed semi-ripened strips are then subjected to a second drawing process to prepare polyimide / hemp mixed fiber strips with a basis weight of 16 g / 5 m, the number of strands of which is drawn in the second drawing process being 6.

[0059] The polyimide fiber is a polyimide fiber treated with an antistatic oil for 19 hours, the antistatic oil is a mixture of oil and water in a mass ratio of 1:9, and the oil consists of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier;

[0060] The mass ratio of the polyimide fiber strips to the hemp fiber strips in the polyimide / hemp mixed fiber strips is 85:15;

[0061] (2) feeding, combing, coagulating, and twisting the polyimide / hemp mixed fiber strips through a rotor spinning process to obtain rotor-spun polyimide / hemp antibacterial blended yarn, wherein the fibers are treated with high-temperature steam during the twisting process, wherein the temperature of the high-temperature steam is 130° C. and the relative humidity is 80%;

[0062] Among them, the combing roller with a rotation speed of 5300r / min is used;

[0063] Twisting into yarn relies on the joint action of rotor, false twist disc and yarn delivery roller;

[0064] The rotating speed of the rotor is 60000r / min;

[0065] The false twist disc consists of an inner shell and an outer shell;

[0066] The inner shell is placed inside the outer shell, and the two shells form a closed hollow chamber.

[0067] The inner shell is made of stainless steel and consists of a coaxial trumpet-shaped upper section and a hollow cylindrical lower section. The upper section is 4mm long and 0.6mm thick; the lower section is 16mm long and 0.6mm thick. The upper section has the large end at the top and the small end at the bottom, with an inner radius of 9mm at the large end and 1mm at the small end. The inner diameter of the small end is the same as that of the lower section. The upper section has 22 circular holes with a radius of 0.3mm that penetrate the hollow chamber.

[0068] The outer shell is composed of an upper portion and a lower portion, both of which are hollow cylindrical and coaxial. The inner diameter of the upper portion of the outer shell is equal to the outer diameter of the large end of the upper section of the inner shell. The length of the upper portion of the outer shell is 4 mm and the wall thickness is 0.6 mm. The inner diameter of the lower portion of the outer shell is 5 mm, the length is 16 mm, and the wall thickness is 0.5 mm.

[0069] The lower portion of the housing is connected to a vent pipe, which penetrates and communicates with the hollow chamber. The vent pipe has an inner diameter of 3 mm and a wall thickness of 0.6 mm. The connection point between the vent pipe and the lower portion of the housing is designated as point A, and the distance between point A and the upper portion of the housing is 22% of the length of the lower portion of the housing.

[0070] The vent pipe is connected to a regulating device, which is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe. The flow rate of the high-temperature water vapor entering the vent pipe is 0.0005m 3 / s;

[0071] The high-temperature steam is used to treat the fibers during twisting into yarns by conveying the high-temperature steam into the hollow chamber through a ventilation pipe.

[0072] The final rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 16 cN / tex, a hairiness index of 7 yarns / m, a yarn uniformity of 12%, an antibacterial rate against Candida albicans after 18 hours of 87%, an antibacterial rate against Escherichia coli after 18 hours of 88%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 99%.

[0073] Example 3

[0074] A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn, comprising the following steps:

[0075] (1) Preparation of polyimide / hemp mixed fiber strips;

[0076] The polyimide fiber is opened and carded into strips to prepare polyimide fiber strips with a basis weight of 17 g / 5 m, and the hemp fiber is opened and carded into strips to prepare hemp fiber strips with a basis weight of 10 g / 5 m, and the polyimide fiber strips and hemp fiber strips are then subjected to a first drawing process to prepare mixed semi-ripened strips with a basis weight of 19 g / 5 m, the number of strands of which is drawn in the first drawing process being 6, and the mixed semi-ripened strips are then subjected to a second drawing process to prepare polyimide / hemp mixed fiber strips with a basis weight of 18 g / 5 m, the number of strands of which is drawn in the second drawing process being 6;

[0077] The polyimide fiber is a polyimide fiber treated with an antistatic oil for 20 hours, the antistatic oil is a mixture of oil and water in a mass ratio of 1:9, and the oil consists of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier;

[0078] The mass ratio of polyimide fiber strips to hemp fiber strips in the prepared polyimide / hemp mixed fiber strips is 88:12;

[0079] (2) feeding, combing, coagulating, and twisting the polyimide / hemp mixed fiber strips through a rotor spinning process to obtain rotor-spun polyimide / hemp antibacterial blended yarn, and treating the fibers with high-temperature steam during the twisting process, wherein the temperature of the high-temperature steam is 135° C. and the relative humidity is 88%;

[0080] Among them, the combing roller with a rotation speed of 5500r / min is used for combing;

[0081] Twisting into yarn relies on the joint action of rotor, false twist disc and yarn delivery roller;

[0082] The rotating speed of the rotor is 70000r / min;

[0083] The false twist disc consists of an inner shell and an outer shell;

[0084] The inner shell is placed inside the outer shell, and the two shells form a closed hollow chamber.

[0085] The inner shell is made of stainless steel and consists of a coaxial trumpet-shaped upper section and a hollow cylindrical lower section. The upper section is 4mm long and 0.7mm thick; the lower section is 17mm long and 0.7mm thick. The upper section has the large end at the top and the small end at the bottom, with an inner radius of 9mm at the large end and 1mm at the small end. The inner diameter of the small end is the same as that of the lower section. The upper section has 24 circular holes with a radius of 0.35mm that penetrate the hollow chamber.

[0086] The outer shell is composed of an upper portion and a lower portion, both of which are hollow cylindrical and coaxial. The inner diameter of the upper portion of the outer shell is equal to the outer diameter of the large end of the upper section of the inner shell. The length of the upper portion of the outer shell is 4 mm and the wall thickness is 0.7 mm. The inner diameter of the lower portion of the outer shell is 5 mm, the length is 17 mm, and the wall thickness is 0.5 mm.

[0087] The lower portion of the housing is connected to a vent pipe, which penetrates and communicates with the hollow chamber. The vent pipe has an inner diameter of 3 mm and a wall thickness of 0.7 mm. The connection point between the vent pipe and the lower portion of the housing is designated as point A, and the distance between point A and the upper portion of the housing is 24% of the length of the lower portion of the housing.

[0088] The vent pipe is connected to a regulating device, which is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe. The flow rate of the high-temperature water vapor entering the vent pipe is 0.0007m 3 / s;

[0089] The high-temperature steam is used to treat the fibers during twisting into yarns by conveying the high-temperature steam into the hollow chamber through a ventilation pipe.

[0090] The final rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 17 cN / tex, a hairiness index of 5 yarns / m, a yarn uniformity of 13%, an antibacterial rate against Candida albicans after 18 hours of 90%, an antibacterial rate against Escherichia coli after 18 hours of 91%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 97%.

[0091] Example 4

[0092] A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn, comprising the following steps:

[0093] (1) Preparation of polyimide / hemp mixed fiber strips;

[0094] The polyimide fiber is opened and carded into strips to prepare polyimide fiber strips with a basis weight of 18 g / 5 m, and the hemp fiber is opened and carded into strips to prepare hemp fiber strips with a basis weight of 8 g / 5 m. The polyimide fiber strips and the hemp fiber strips are then subjected to a first drawing process to prepare mixed semi-ripened strips with a basis weight of 19 g / 5 m, the number of strands of which is drawn in the first drawing process being 8. The mixed semi-ripened strips are then subjected to a second drawing process to prepare polyimide / hemp mixed fiber strips with a basis weight of 20 g / 5 m, the number of strands of which is drawn in the second drawing process being 8.

[0095] The polyimide fiber is a polyimide fiber treated with an antistatic oil for 21 hours, the antistatic oil is a mixture of oil and water in a mass ratio of 1:9, and the oil consists of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier;

[0096] The mass ratio of the polyimide fiber strips to the hemp fiber strips in the polyimide / hemp mixed fiber strips is 80:20;

[0097] (2) feeding, combing, coagulating, and twisting the polyimide / hemp mixed fiber strips through a rotor spinning process to obtain rotor-spun polyimide / hemp antibacterial blended yarn, wherein the fibers are treated with high-temperature steam during the twisting process, wherein the temperature of the high-temperature steam is 125° C. and the relative humidity is 88%;

[0098] Among them, the combing roller with a rotation speed of 5700r / min is used;

[0099] Twisting into yarn relies on the joint action of rotor, false twist disc and yarn delivery roller;

[0100] The rotating speed of the rotor is 80000r / min;

[0101] The false twist disc consists of an inner shell and an outer shell;

[0102] The inner shell is placed inside the outer shell, and the two shells form a closed hollow chamber.

[0103] The inner shell is made of ceramic and consists of a coaxial trumpet-shaped upper section and a hollow cylindrical lower section. The upper section is 5mm long and 0.8mm thick; the lower section is 18mm long and 0.8mm thick. The upper section has the larger end at the top and the smaller end at the bottom, with an inner radius of 10mm at the larger end and 2mm at the smaller end. The inner diameter of the smaller end is the same as that of the lower section. The upper section has 26 circular holes with a radius of 0.4mm that penetrate the hollow chamber.

[0104] The outer shell is composed of an upper portion and a lower portion, both of which are hollow cylindrical and coaxial. The inner diameter of the upper portion of the outer shell is equal to the outer diameter of the large end of the upper section of the inner shell. The length of the upper portion of the outer shell is 5 mm and the wall thickness is 0.8 mm. The inner diameter of the lower portion of the outer shell is 6 mm, the length is 18 mm, and the wall thickness is 1 mm.

[0105] The lower portion of the housing is connected to a vent tube, which penetrates and communicates with the hollow chamber. The vent tube has an inner diameter of 4 mm and a wall thickness of 0.8 mm. The connection point between the vent tube and the lower portion of the housing is designated as point A, and the distance between point A and the upper portion of the housing is 26% of the length of the lower portion of the housing.

[0106] The vent pipe is connected to a regulating device, which is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe. The flow rate of the high-temperature water vapor entering the vent pipe is 0.0007m 3 / s;

[0107] The high-temperature steam is used to treat the fibers during twisting into yarns by conveying the high-temperature steam into the hollow chamber through a ventilation pipe.

[0108] The final rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 15 cN / tex, a hairiness index of 8 yarns / m, a yarn uniformity of 13.5%, an antibacterial rate against Candida albicans after 18 hours of 88%, an antibacterial rate against Escherichia coli after 18 hours of 92%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 99.9%.

[0109] Example 5

[0110] A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn, comprising the following steps:

[0111] (1) Preparation of polyimide / hemp mixed fiber strips;

[0112] The polyimide fiber is opened and carded into strips to prepare polyimide fiber strips with a basis weight of 19 g / 5 m, and the hemp fiber is opened and carded into strips to prepare hemp fiber strips with a basis weight of 9 g / 5 m. The polyimide fiber strips and the hemp fiber strips are then subjected to a first drawing process to prepare mixed semi-ripened strips with a basis weight of 20 g / 5 m, the number of fibers drawn in the first drawing process being 8, and the mixed semi-ripened strips are then subjected to a second drawing process to prepare polyimide / hemp mixed fiber strips with a basis weight of 19 g / 5 m, the number of fibers drawn in the second drawing process being 8;

[0113] The polyimide fiber is a polyimide fiber treated with an antistatic oil for 22 hours, the antistatic oil is a mixture of oil and water in a mass ratio of 1:9, and the oil consists of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier;

[0114] The mass ratio of the polyimide fiber strips to the hemp fiber strips in the polyimide / hemp mixed fiber strips is 90:10;

[0115] (2) feeding, combing, coagulating, and twisting the polyimide / hemp mixed fiber strips through a rotor spinning process to obtain rotor-spun polyimide / hemp antibacterial blended yarn, wherein the fibers are treated with high-temperature steam during the twisting process, wherein the temperature of the high-temperature steam is 140° C. and the relative humidity is 90%;

[0116] Among them, the combing roller uses a speed of 5900r / min;

[0117] Twisting into yarn relies on the joint action of rotor, false twist disc and yarn delivery roller;

[0118] The rotating speed of the rotor is 90000r / min;

[0119] The false twist disc consists of an inner shell and an outer shell;

[0120] The inner shell is placed inside the outer shell, and the two shells form a closed hollow chamber.

[0121] The inner shell is made of ceramic and consists of a coaxial trumpet-shaped upper section and a hollow cylindrical lower section. The upper section is 5mm long and 0.9mm thick; the lower section is 19mm long and 0.9mm thick. The upper section has the large end at the top and the small end at the bottom, with an inner radius of 10mm at the large end and 2mm at the small end. The inner diameter of the small end is the same as that of the lower section. The upper section has 28 circular holes with a radius of 0.45mm that penetrate and connect to the hollow chamber.

[0122] The outer shell is composed of an upper portion and a lower portion, both of which are hollow cylindrical and coaxial. The inner diameter of the upper portion of the outer shell is equal to the outer diameter of the large end of the upper section of the inner shell. The length of the upper portion of the outer shell is 5 mm and the wall thickness is 0.9 mm. The inner diameter of the lower portion of the outer shell is 6 mm, the length is 19 mm, and the wall thickness is 1 mm.

[0123] The lower portion of the housing is connected to a vent tube, which penetrates and communicates with the hollow chamber. The vent tube has an inner diameter of 4 mm and a wall thickness of 0.9 mm. The connection point between the vent tube and the lower portion of the housing is designated as point A, and the distance between point A and the upper portion of the housing is 28% of the length of the lower portion of the housing.

[0124] The vent pipe is connected to a regulating device, which is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe. The flow rate of the high-temperature water vapor entering the vent pipe is 0.001m 3 / s;

[0125] The high-temperature steam is used to treat the fibers during twisting into yarns by conveying the high-temperature steam into the hollow chamber through a ventilation pipe.

[0126] The final rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 18 cN / tex, a hairiness index of 9 yarns / m, a yarn uniformity of 14%, an antibacterial rate against Candida albicans after 18 hours of 89%, an antibacterial rate against Escherichia coli after 18 hours of 89%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 99%.

[0127] Example 6

[0128] A spinning method for rotor-spun polyimide / hemp antibacterial blended yarn, comprising the following steps:

[0129] (1) Preparation of polyimide / hemp mixed fiber strips;

[0130] The polyimide fiber is opened and carded into strips to prepare polyimide fiber strips with a basis weight of 20g / 5m, and the hemp fiber is opened and carded into strips to prepare hemp fiber strips with a basis weight of 10g / 5m. The polyimide fiber strips and the hemp fiber strips are then subjected to a first drawing process to prepare mixed semi-cooked strips with a basis weight of 20g / 5m, the number of fibers drawn in the first drawing process being 8, and the mixed semi-cooked strips are then subjected to a second drawing process to prepare polyimide / hemp mixed fiber strips with a basis weight of 20g / 5m, the number of fibers drawn in the second drawing process being 8;

[0131] The polyimide fiber is a polyimide fiber treated with an antistatic oil for 24 hours, the antistatic oil is a mixture of oil and water in a mass ratio of 1:9, and the oil consists of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier;

[0132] The mass ratio of the polyimide fiber strips to the hemp fiber strips in the polyimide / hemp mixed fiber strips is 90:10;

[0133] (2) feeding, combing, coagulating, and twisting the polyimide / hemp mixed fiber strips through a rotor spinning process to obtain rotor-spun polyimide / hemp antibacterial blended yarn, wherein the fibers are treated with high-temperature steam during the twisting process, wherein the temperature of the high-temperature steam is 150° C. and the relative humidity is 90%;

[0134] Among them, the combing roller with a rotation speed of 6000r / min is used;

[0135] Twisting into yarn relies on the joint action of rotor, false twist disc and yarn delivery roller;

[0136] The rotating speed of the rotor is 100000r / min;

[0137] The false twist disc consists of an inner shell and an outer shell;

[0138] The inner shell is placed inside the outer shell, and the two shells form a closed hollow chamber.

[0139] The inner shell is made of ceramic and consists of a coaxial trumpet-shaped upper section and a hollow cylindrical lower section. The upper section is 5mm long and 1mm thick; the lower section is 20mm long and 1mm thick. The upper section has a large end at the top and a small end at the bottom. The inner radius of the large end is 10mm, and the inner radius of the small end is 2mm. The inner diameter of the small end of the upper section is the same as that of the lower section. The upper section of the inner shell has 30 circular holes with a radius of 0.5mm that penetrate and connect to the hollow chamber.

[0140] The outer shell is composed of an upper portion and a lower portion, both of which are hollow cylindrical and coaxial. The inner diameter of the upper portion of the outer shell is equal to the outer diameter of the large end of the upper section of the inner shell. The length of the upper portion of the outer shell is 5 mm and the wall thickness is 1 mm. The inner diameter of the lower portion of the outer shell is 6 mm, the length is 20 mm, and the wall thickness is 1 mm.

[0141] The lower portion of the housing is connected to a vent pipe, which penetrates and communicates with the hollow chamber. The vent pipe has an inner diameter of 4 mm and a wall thickness of 1 mm. The connection point between the vent pipe and the lower portion of the housing is designated as point A, and the distance between point A and the upper portion of the housing is 30% of the length of the lower portion of the housing.

[0142] The vent pipe is connected to a regulating device, which is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe. The flow rate of the high-temperature water vapor entering the vent pipe is 0.001m 3 / s;

[0143] The high-temperature steam is used to treat the fibers during twisting into yarns by conveying the high-temperature steam into the hollow chamber through a ventilation pipe.

[0144] The final rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 18 cN / tex, a hairiness index of 10 yarns / m, a yarn uniformity of 12%, an antibacterial rate against Candida albicans after 18 hours of 86%, an antibacterial rate against Escherichia coli after 18 hours of 93%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 99.5%.

Claims

1. A spinning method for rotor-spinning polyimide / hemp antibacterial blended yarn, characterized in that: The polyimide / hemp mixed fiber strips are fed, combed, coagulated, and twisted into yarn through a rotor spinning process to produce a rotor-spun polyimide / hemp antibacterial blended yarn. The fibers are treated with high-temperature steam during the twisting process. The high-temperature steam treats the fibers when the fiber strands coagulated in the rotor move to the surface of the false twist disk during the process of being twisted and drawn out of the rotor. At this time, the fiber aggregation form is a state between the fiber strands and the yarn. The temperature of the high-temperature steam is not less than 120° C. The twisting process relies on the joint action of the rotor, the false twist disk, and the yarn delivery roller. The false twist disc is composed of an inner shell and an outer shell; the inner shell is nested in the outer shell, and the two enclose a closed hollow chamber; the inner shell is composed of a coaxial trumpet-shaped upper section and a hollow cylindrical lower section, the large end of the upper section is at the top and the small end is at the bottom, and the inner diameter of the small end of the upper section is the same as the inner diameter of the lower section; 20 to 30 circular holes are distributed on the upper section of the inner shell and are connected to the hollow chamber; The lower portion of the shell is connected to a vent pipe, and the vent pipe is connected through the hollow chamber; The high-temperature steam is used to treat the fibers during the twisting process to form yarns, and this is achieved by transporting the high-temperature steam into the hollow chamber through the ventilation pipe.

2. The spinning method of a rotor-spun polyimide / hemp antibacterial blended yarn according to claim 1, characterized in that: The temperature of the high-temperature water vapor is not higher than 150°C, and the relative humidity is 80-90%.

3. The spinning method of a rotor-spun polyimide / hemp antibacterial blended yarn according to claim 1, characterized in that: The inner radius of the large end of the upper section of the inner shell is 9-10 mm, the inner radius of the small end of the upper section of the inner shell is 1-2 mm, and the radius of the circular hole is 0.25-0.5 mm; The length of the upper section of the inner shell is 4-5 mm, and the wall thickness is 0.5-1 mm; the length of the lower section of the inner shell is 15-20 mm, and the wall thickness is 0.5-1 mm; The outer shell is composed of an upper portion and a lower portion, both of which are hollow cylindrical and coaxial; the inner diameter of the upper portion of the outer shell is equal to the outer diameter of the large end of the upper section of the inner shell; the length of the upper portion of the outer shell is 4 to 5 mm, and the wall thickness is 0.5 to 1 mm; the inner diameter of the lower portion of the outer shell is 5 to 6 mm, the length is 15 to 20 mm, and the wall thickness is 0.5 to 1 mm; The connection point between the vent pipe and the lower portion of the housing is marked as point A, and the distance between point A and the upper portion of the housing is 20 to 30% of the length of the lower portion of the housing; The inner diameter of the vent pipe is 3-4 mm, and the wall thickness is 0.5-1 mm. The vent pipe is connected to a regulating device, which is used to adjust the temperature and flow rate of the high-temperature water vapor entering the vent pipe. The flow rate of the high-temperature water vapor entering the vent pipe is 0.0005-0.001 m 3 / s.

4. The spinning method of a rotor-spun polyimide / hemp antibacterial blended yarn according to claim 1, characterized in that: The combing adopts a combing roller with a rotation speed of 5000-6000 r / min, and the rotation speed of the rotor cup is 50000-100000 r / min.

5. The spinning method of a rotor-spun polyimide / hemp antibacterial blended yarn according to claim 1, characterized in that: The mass ratio of polyimide fiber to hemp fiber in the polyimide / hemp mixed fiber strip is 80-90:20-10.

6. The spinning method of a rotor-spun polyimide / hemp antibacterial blended yarn according to claim 5, characterized in that: The preparation process of the polyimide / hemp mixed fiber strips is as follows: polyimide fibers are opened and carded into strips to form polyimide fiber strips, while hemp fibers are opened and carded into strips to form hemp fiber strips, and then the polyimide fiber strips and the hemp fiber strips are subjected to two drawing processes to form polyimide / hemp mixed fiber strips; the quantitative weight of the polyimide fiber strips is 15 to 20 g / 5 m, and the quantitative weight of the hemp fiber strips is 8 to 10 g / 5 m.

7. The spinning method of polyimide / hemp antibacterial blended yarn according to claim 6, characterized in that: The specific process of preparing the polyimide fiber strips and the hemp fiber strips into polyimide / hemp mixed fiber strips through two drawing processes is as follows: first, the polyimide fiber strips and the hemp fiber strips are prepared into mixed semi-cooked strips through a first drawing process, and then the mixed semi-cooked strips are prepared into polyimide / hemp mixed fiber strips through a second drawing process; the number of fibers drawn in the first drawing process is 6 or 8, and the weight of the mixed semi-cooked strips is 18 to 20 g / 5 m; the number of fibers drawn in the second drawing process is 6 or 8, and the weight of the polyimide / hemp mixed fiber strips is 15 to 22 g / 5 m.

8. The spinning method of polyimide / hemp antibacterial blended yarn according to claim 6, characterized in that: The polyimide fiber is a polyimide fiber treated with an antistatic oil agent, the antistatic oil agent is a mixture of oil and water in a mass ratio of 1:9, and the oil agent consists of 78.4wt% white oil, 2wt% antistatic agent, 13.72wt% JFC penetrant, 2.94wt% MOA-3 emulsifier and 2.94wt% MOA-9 emulsifier.

9. A method for producing rotor-spun polyimide / hemp antibacterial blended yarn according to any one of claims 1 to 8, characterized in that: The rotor-spun polyimide / hemp antibacterial blended yarn has a breaking strength of 14-18 cN / tex, a hairiness index of 5-10 yarns / m, a yarn evenness of 10-15%, an antibacterial rate against Candida albicans after 18 hours of 85-90%, an antibacterial rate against Escherichia coli after 18 hours of 88-93%, and an antibacterial rate against Staphylococcus aureus after 18 hours of 97-99.9%.

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