A kind of multifunctional special work clothes fabric and its preparation process

Abstract

The invention discloses a multifunctional special workwear fabric and a preparation process thereof, which relates to the technical field of special fabric preparation, solves the problems that the existing electromagnetic shielding function fabric production process is complicated, the risk is relatively large, the product fabric has poor wear resistance, and does not have good water washing resistance and sweat resistance. The following scheme is now proposed, which includes an inner skin-friendly layer, an intermediate functional layer, and an outer reinforcement layer, and the inner skin-friendly layer, the intermediate functional layer and the outer reinforcement layer are arranged in different ways. The fabric has the characteristics of increasing its electromagnetic shielding, anti-puncture, flame retardant, antibacterial fabric performance, and has better wear resistance.

Description

Technical Field

[0001] The invention relates to the technical field of special fabric preparation, and in particular to a multifunctional special work clothes fabric and a preparation process thereof. Background Art

[0002] In our daily lives, electromagnetic waves are everywhere and invisible, which is called "electronic radiation pollution" by scientists. Microwave ovens and induction cookers that are not used properly or have poor sealing will cause radiation. If not handled properly, individuals will be at risk of cancer, and may also cause explosions and fires. At the same time, in the field of national defense science and technology and special operations, the development of high-performance fabrics with composite functions has become an important topic in the fields of national economy and national defense and military.

[0003] At the same time, with the continuous emergence of high-performance textiles, various functional and differentiated fibers emerge in an endless stream, and fabrics are also developing in the direction of high performance and multi-function. For example, the flame-retardant conductive multifunctional fabric and preparation method disclosed in publication number CN113981696A uses polypyrrole PPY coating to make fabrics. Because it contains a certain amount of nitrogen elements, it can enhance the flame retardant effect of phytic acid. It is a conjugated polymer, and phytic acid as a doping acid can generate positive charges on the main chain of polypyrrole, thereby changing the electron cloud density in the main chain, forming a large conjugated system, and having the ability to conduct electricity, so that the fabric can achieve flame retardancy, conductivity, electromagnetic shielding, heat generation and other multifunctional fabrics. But we should also see the problems:

[0004] 1. Although the coating method is used to achieve flame retardancy and electromagnetic shielding properties of the fabric, when it encounters sweat immersion or washing clothes, its process layer will be washed away by water, and its functionality will be greatly reduced. It does not have good water resistance and sweat resistance;

[0005] 2. The fabric functions are realized by using some chemicals and synthetic processes, which are complicated and involve operational risks;

[0006] 3. And its fabric has poor wear resistance.

[0007] Therefore, a multifunctional special work clothes fabric and a preparation process thereof are proposed. Summary of the invention

[0008] The purpose of the present invention is to provide a multifunctional special work clothes fabric and its preparation process, which solves the problems that the existing electromagnetic shielding function fabric production process is complex and risky, the product fabric has poor wear resistance, and does not have good water washing resistance and sweat resistance.

[0009] To achieve the above objectives, the present invention provides the following technical solutions: a multifunctional special work clothes fabric, comprising an inner skin-friendly layer, a middle functional layer, and an outer reinforcement layer, wherein the inner skin-friendly layer, the middle functional layer and the outer reinforcement layer are arranged in different ways.

[0010] Preferably, the inner skin-friendly layer and the outer reinforcement layer are respectively located on the inner and outer sides of the middle functional layer, and the inner skin-friendly layer is made of moisture absorbing and perspiration-wicking fiber material.

[0011] Preferably, the inner skin-friendly layer is the reference direction layer at 0° and is placed on the first layer of the fabric. The direction of the middle functional layer is adjusted to 45° and is placed on the second layer of the fabric. The direction of the outer reinforcement layer is adjusted to 90° and is placed on the third layer of the fabric.

[0012] Preferably, the materials of the intermediate functional layer and the outer reinforcement layer are both stainless steel microfilaments with a diameter of 0.035 mm and aramid filaments which are twisted and combined into threads and woven into fabrics.

[0013] Preferably, the strand ratio of the stainless steel microfilaments to the aramid filaments is 1:1 or 2:1.

[0014] A preparation process of a multifunctional special workwear fabric comprises the following steps:

[0015] S1: Production environment setting: production machine segmentation control, production site temperature and humidity control;

[0016] S2: doubling process: stainless steel microfilaments as fine as 0.035 mm and aramid filaments are first doubling on a doubling machine, with the yarn number ratio being 1 to 2:1, and the doubling speed being set at a medium speed of 300 m / min to obtain untwisted multifilaments;

[0017] S3: Heat setting process 1: heat setting the multi-tube untwisted multifilament to prevent the untwisted multifilament from twisting during the twisting process, and use a high temperature oven at 90°C under vacuum for 1 hour to set the shape;

[0018] S4: Twisting process:

[0019] (1) Use a two-for-one twister to twist the multi-tube untwisted multifilaments, and use an anti-winding grooved drum to prevent excessive tension from abrading the yarn surface structure and producing powder;

[0020] (2) According to the winding direction trend of the untwisted multifilament during paralleling, the corresponding twist direction is selected so that the gyration forces between the single filaments offset each other and reduce the elastic loss of the composite twisted filament;

[0021] (3) The derailment of the belt disc under the twister needs to be corrected every 30 minutes to reduce equipment failure rate and downtime rate, improve production efficiency, and obtain multi-tube composite twisted yarn;

[0022] S5: Heat setting process 2: heat setting the multi-tube composite twisted yarn again, and put it in a high temperature oven at 120°C under vacuum for 3 hours;

[0023] S6: Sizing process:

[0024] (1) The multi-tube composite twisted yarn is sizing treated by using a fully automatic single yarn sizing machine, a double-immersion double-pressing sizing method and a double-tumbler hot air drying method;

[0025] (2) When sizing, the workshop temperature is 25℃-30℃, and the relative humidity is controlled at 65%-70%. Before starting sizing, add a large twisted wire between the shafts;

[0026] (3) When warping and beaming, add a small twisted wire between two adjacent yarns;

[0027] S7: Weaving process: Weaving the multi-tube composite twisted yarn, using a rapier loom, selecting a reed number of 70, inserting three warp yarns into each reed, the warp yarns are composite twisted yarns after sizing, and the weft yarns are composite twisted yarns without sizing;

[0028] S8: Desizing process: Put the sample cloth into clean water, boil for 15-20 minutes, then take it out, rinse the sample yarn with clean water until the surface of the sample cloth is clean, then put the sample cloth into the oven, dry it to a constant weight and then take it out.

[0029] Preferably, the twist (1) in S4 is set to 50T / 10cm, the winding tension compensation is set to 1N, and the machine spindle speed is set to 6000r / min.

[0030] Preferably, in said S6 (1), the sizing speed is 40 m / min, the winding tension is 210 N, the feeding tension is 100 N, the unwinding tension is 300 N, the pre-baking temperature is 120° C., the main baking temperature is 100° C., and the weaving shaft is tightly wound.

[0031] Preferably, the slurry in S6 is: modified starch, PVA1799, acrylic acid, antistatic agent and smoothing agent, with a mass ratio of 6:2:1:1:1, and is poured into a beaker and placed on a magnetic stirrer, and fully stirred for 10 minutes to dissolve.

[0032] Preferably, the S7 has a warp density of 210 strands / 10 cm, a weft density of 260 strands / 10 cm, a warp tightness of 73.09%, a weft tightness of 82.04%, a total tightness of 95.53%, and a plain weave with tight warp and weft interweaving, a weft shrinkage of 1.33%, a warp shrinkage of 1.64%, a piece length of 18 cm, and a width of 15 cm.

[0033] Compared with the related art, the multifunctional special workwear fabric and the preparation process thereof provided by the present invention have the following beneficial effects:

[0034] 1. The present invention provides a multifunctional special work clothes fabric and a preparation process thereof. By adopting a multi-layer fabric structure and using hydrophilic fibers as the inner skin-friendly layer of the fabric, the sweat produced by the human body is quickly absorbed, and then transmitted to the outside through the gap between the middle functional layer and the outer reinforcement layer, thereby achieving a comfortable and cool body feeling. At the same time, the three layers of fabric are arranged in different ways, thereby increasing its electromagnetic shielding, anti-puncture, flame retardant and antibacterial fabric properties.

[0035] 2. The present invention provides a multifunctional special work clothes fabric and its preparation process. Through this process, especially the sizing process, the inherent strength of the warp yarn is strengthened, the wear resistance of the warp yarn is improved, the surface hairiness of the yarn is more adherent, the wear resistance is improved, the internal stress of the yarn caused by twisting is smoothed, and the subsequent weaving is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a schematic structural diagram of an inner skin-friendly layer and a middle functional layer of a multifunctional special workwear fabric.

[0037] Figure 2 The present invention is a schematic diagram of the structure of three layers of multifunctional special work clothes fabric.

[0038] Figure 3 The present invention is a schematic structural diagram of the inner skin-friendly layer of a multifunctional special workwear fabric.

[0039] Figure 4 The diagram is a schematic structural diagram of an intermediate functional layer of a multifunctional special workwear fabric according to the present invention.

[0040] Figure 5 The present invention is a schematic structural diagram of an outer reinforcing layer of a multifunctional special workwear fabric.

[0041] Figure 6 The diagram is a schematic diagram of the layer structure of a multifunctional special workwear fabric of the present invention.

[0042] Figure 7 The figure is a relationship diagram between the number of intermediate functional layers used and the electromagnetic shielding effectiveness of a multifunctional special workwear fabric of the present invention.

[0043] Figure 8 The present invention is a graph showing the relationship between the strand ratio of stainless steel microfilaments to aramid filaments and shielding effectiveness in a middle functional layer of a multifunctional special workwear fabric.

[0044] Fig. 9 This is a three-layer electromagnetic shielding effect diagram of a multifunctional special work clothes fabric of the present invention.

[0045] In the figure: 1. Inner skin-friendly layer; 2. Middle functional layer; 3. Outer reinforcement layer. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] Embodiment 1:

[0048] See also Figure 1-9 The present invention provides a technical solution: a multifunctional special workwear fabric, comprising an inner skin-friendly layer 1, a middle functional layer 2, and an outer reinforcement layer 3, wherein the inner skin-friendly layer 1, the middle functional layer 2 and the outer reinforcement layer 3 are arranged in different ways.

[0049] The inner skin-friendly layer 1 and the outer reinforcement layer 3 are respectively located on the inner and outer sides of the middle functional layer 2. The inner skin-friendly layer 1 is made of moisture absorbing and perspiration-wicking fiber material.

[0050] The inner skin-friendly layer 1 is the reference direction layer at 0° and is placed on the first layer of the fabric. The middle functional layer 2 is adjusted to 45° and is placed on the second layer of the fabric. The outer reinforcement layer 3 is adjusted to 90° and is placed on the third layer of the fabric.

[0051] The materials of the middle functional layer 2 and the outer reinforcement layer 3 are both stainless steel microfilaments with a diameter of 0.035 mm and aramid filaments which are twisted and compounded into threads and woven into fabrics.

[0052] The strand ratio of stainless steel microfilament to aramid filament is 1:1 or 2:1.

[0053] Furthermore, the fabrics of the middle functional layer 2 and the outer reinforcement layer 3 are both composite yarns formed by paralleling stainless steel microfilaments and aramid filaments with a diameter of 0.035 mm on a paralleling machine, and the yarns are woven into the composite yarns. The strand ratio of the stainless steel microfilaments to the aramid filaments in the middle functional layer 2 and the outer reinforcement layer 3 is 1:1.

[0054] Embodiment 2:

[0055] See also Figure 1-9 The present invention provides a technical solution: a multifunctional special workwear fabric, comprising an inner skin-friendly layer 1, a middle functional layer 2, and an outer reinforcement layer 3, wherein the inner skin-friendly layer 1, the middle functional layer 2 and the outer reinforcement layer 3 are arranged in different ways.

[0056] The inner skin-friendly layer 1 and the outer reinforcement layer 3 are respectively located on the inner and outer sides of the middle functional layer 2. The inner skin-friendly layer 1 is made of moisture absorbing and perspiration-wicking fiber material.

[0057] The inner skin-friendly layer 1 is the reference direction layer at 0° and is placed on the first layer of the fabric. The middle functional layer 2 is adjusted to 45° and is placed on the second layer of the fabric. The outer reinforcement layer 3 is adjusted to 90° and is placed on the third layer of the fabric.

[0058] The materials of the middle functional layer 2 and the outer reinforcement layer 3 are both stainless steel microfilaments with a diameter of 0.035 mm and aramid filaments which are twisted and compounded into threads and woven into fabrics.

[0059] The strand ratio of stainless steel microfilament to aramid filament is 1:1 or 2:1.

[0060] Furthermore, the fabrics of the middle functional layer 2 and the outer reinforcement layer 3 are both composite yarns formed by paralleling stainless steel microfilaments with a diameter of 0.035 mm and aramid filaments on a paralleling machine, and the yarn ratio of the stainless steel microfilaments to the aramid filaments in the middle functional layer 2 is 1:1; the yarn ratio of the stainless steel microfilaments to the aramid filaments in the outer reinforcement layer 3 is 2:1.

[0061] Embodiment three:

[0062] See also Figure 1-9 The present invention provides a technical solution: a multifunctional special workwear fabric, comprising an inner skin-friendly layer 1, a middle functional layer 2, and an outer reinforcement layer 3, wherein the inner skin-friendly layer 1, the middle functional layer 2 and the outer reinforcement layer 3 are arranged in different ways.

[0063] The inner skin-friendly layer 1 and the outer reinforcement layer 3 are respectively located on the inner and outer sides of the middle functional layer 2. The inner skin-friendly layer 1 is made of moisture absorbing and perspiration-wicking fiber material.

[0064] The inner skin-friendly layer 1 is the reference direction layer at 0° and is placed on the first layer of the fabric. The middle functional layer 2 is adjusted to 45° and is placed on the second layer of the fabric. The outer reinforcement layer 3 is adjusted to 90° and is placed on the third layer of the fabric.

[0065] The materials of the middle functional layer 2 and the outer reinforcement layer 3 are both stainless steel microfilaments with a diameter of 0.035 mm and aramid filaments which are twisted and compounded into threads and woven into fabrics.

[0066] The strand ratio of stainless steel microfilament to aramid filament is 1:1 or 2:1.

[0067] Furthermore, the fabrics of the middle functional layer 2 and the outer reinforcement layer 3 are both composite yarns formed by paralleling stainless steel microfilaments and aramid filaments with a diameter of 0.035 mm on a paralleling machine, and the yarns are woven into the composite yarns. The strand ratio of the stainless steel microfilaments to the aramid filaments in the middle functional layer 2 and the outer reinforcement layer 3 is 2:1.

[0068] As for the hydrophilic fiber material of the inner skin-friendly layer 1, specifically, it is a moisture-absorbing and perspiration-wicking fabric, including some fibers with heterogeneous cross-sections, hollow or microporous fibers, fibers with surface chemical modifications, and fibers treated with hydrophilic additives.

[0069] According to GB / T30142-2013 "Test Method for Shielding Effectiveness of Planar Electromagnetic Shielding Materials", the electromagnetic shielding performance of the samples was tested using an electromagnetic radiation protection performance tester. The shielding performance SE is used to characterize the electromagnetic shielding effect. The shielding performance of electromagnetic waves passing through the shielding material can be calculated as follows:

[0070]

[0071] In formula (1), SE is the shielding effectiveness, in dB; E0 is the electric field strength when there is no shielding material; E1 is the electric field strength when there is shielding material; H0 is the magnetic field strength when there is no shielding material; H1 is the magnetic field strength when there is shielding material.

[0072] According to 2.7.1 of GB / T 26667-2011 electromagnetic shielding material terminology: electromagnetic shielding effectiveness SE is usually a negative value, but it is customary to use its absolute value. When there is no sample shielding, the SE value is 0. The larger the SE value, the better the electromagnetic radiation protection effect.

[0073] According to Schelkunoff shielding theory, the shielding performance of shielding materials is determined by shielding effectiveness (SE), that is, SE = R + A + B. Therefore, when electromagnetic waves propagate to the surface of the fabric, three different electromagnetic wave reflections usually occur: (1) electromagnetic wave reflection attenuation (R) caused by impedance mutation of different structures on the incident fabric surface; (2) attenuation (A) that is not reflected but enters the interior of the fabric and is absorbed by the specific material of the fabric; (3) multiple reflection attenuation (B) after entering the interior of the fabric. According to the present invention, as the lamination angle of the fabric changes, that is, by arranging the three layers of fabric, namely the inner skin-friendly layer 1, the middle functional layer 2 and the outer reinforcement layer 3, in different ways, the fabric itself is more closed with the support of plain weave without floating lines, resulting in an increase in the number and loss of electromagnetic wave reflections (B) inside the fabric, resulting in accelerated loss of electromagnetic waves, so the shielding effectiveness will increase. The line graph of the shielding effect calculated by formula (1) is shown in the attached manual. Figure 4-5 shown.

[0074] From the above specific implementation modes one to three, it can be concluded that in this implementation mode, the strand ratio of stainless steel microfilaments to aramid filaments in the middle functional layer 2 is 1:1; the strand ratio of stainless steel microfilaments to aramid filaments in the outer reinforcement layer 3 is 2:1; and the electromagnetic shielding effect of the obtained fabric is better and the cost is the lowest.

[0075] Its multi-layer fabric structure uses hydrophilic fibers as the skin-friendly layer on the inside of the fabric, which quickly absorbs sweat produced by the human body, and then transmits it to the outside through the gap between the middle functional layer and the outer reinforcement layer, thereby achieving a comfortable and cool body feeling. At the same time, the three layers of fabric are arranged in different ways, which increases its electromagnetic shielding, anti-puncture, flame retardant and antibacterial fabric properties.

[0076] Embodiment 4:

[0077] See also Figure 1-9 As shown, based on the first embodiment, the present invention provides a technical solution: a preparation process of a multifunctional special workwear fabric, comprising the following steps:

[0078] S1: Production environment setting: production machine segmentation control, production site temperature and humidity control;

[0079] S2: doubling process: stainless steel microfilaments as fine as 0.035 mm and aramid filaments are first doubling on a doubling machine, with the yarn number ratio being 1 to 2:1, and the doubling speed being set at a medium speed of 300 m / min to obtain untwisted multifilaments;

[0080] S3: Heat setting process 1: heat setting the multi-tube untwisted multifilament to prevent the untwisted multifilament from twisting during the twisting process, and use a high temperature oven at 90°C under vacuum for 1 hour to set the shape;

[0081] S4: Twisting process:

[0082] (1) Use a two-for-one twister to twist the multi-tube untwisted multifilaments, and use an anti-winding grooved drum to prevent excessive tension from abrading the yarn surface structure and producing powder;

[0083] (2) According to the winding direction trend of the untwisted multifilament during paralleling, the corresponding twist direction is selected so that the gyration forces between the single filaments offset each other and reduce the elastic loss of the composite twisted filament;

[0084] (3) The derailment of the belt disc under the twister needs to be corrected every 30 minutes to reduce equipment failure rate and downtime rate, improve production efficiency, and obtain multi-tube composite twisted yarn;

[0085] S5: Heat setting process 2: heat setting the multi-tube composite twisted yarn again, and put it in a high temperature oven at 120°C under vacuum for 3 hours;

[0086] S6: Sizing process:

[0087] (1) The multi-tube composite twisted yarn is sizing treated by using a fully automatic single yarn sizing machine, a double-immersion double-pressing sizing method and a double-tumbler hot air drying method;

[0088] (2) When sizing, the workshop temperature is 25℃-30℃, and the relative humidity is controlled at 65%-70%. Before starting sizing, add a large twisted wire between the shafts;

[0089] (3) When warping and beaming, add a small twisted wire between two adjacent yarns;

[0090] S7: Weaving process: Weaving the multi-tube composite twisted yarn, using a rapier loom, selecting a reed number of 70, inserting three warp yarns into each reed, the warp yarns are composite twisted yarns after sizing, and the weft yarns are composite twisted yarns without sizing;

[0091] S8: Desizing process: Put the sample cloth into clean water, boil for 15-20 minutes, then take it out, rinse the sample yarn with clean water until the surface of the sample cloth is clean, then put the sample cloth into the oven, dry it to a constant weight and then take it out.

[0092] The twist (1) in S4 is set to 50T / 10cm, the winding tension compensation is set to 1N, and the machine spindle speed is set to 6000r / min.

[0093] In S6, (1) the sizing speed is 40 m / min, the winding tension is 210 N, the feeding tension is 100 N, the unwinding tension is 300 N, the pre-drying temperature is 120 °C, the main drying temperature is 100 °C, and the weaving beam should be tightly wound.

[0094] The slurry in S6 is: modified starch, PVA1799, acrylic acid, antistatic agent and smoothing agent, with a mass ratio of 6:2:1:1:1. It is poured into a beaker and placed on a magnetic stirrer, and stirred for 10 minutes to dissolve.

[0095] S7 has a warp density of 210 strands / 10cm, a weft density of 260 strands / 10cm, a warp tightness of 73.09%, a weft tightness of 82.04%, and a total tightness of 95.53%. The machine pattern selects a plain weave with tight warp and weft interweaving, a weft shrinkage of 1.33%, a warp shrinkage of 1.64%, a piece length of 18cm, and a width of 15cm.

[0096] In this embodiment:

[0097] 1) Production environment settings:

[0098] Production machine segmentation control. According to the characteristics of aramid fiber, before production, the placement of machines and the layout of manufacturing processes should be considered according to the characteristics of the fiber, and the machines suitable for different raw materials should be clearly divided to avoid the residue of raw materials of different colors and characteristics in the machines, which will affect the production and cause defects such as pilling, oil stains, etc. Because aramid fiber is light yellow in color, it can be divided into three lines of light color, dark color and mixed color with other production lines. At the same time, hard partitions or soft partitions are used in combination between each production line to ensure that the lines do not interfere with each other. In addition, in order to maintain constant temperature and humidity at the production site, heat-insulating polyurethane insulation sheds can be used in the processes of paralleling, twisting, weaving, etc.

[0099] Temperature and humidity control at the production site. Aramid fiber is sensitive to changes in temperature and humidity during production. High or low temperature will affect the production process and product quality. If the temperature and humidity are low, static electricity will be serious during production, and a large amount of aramid fiber will be adsorbed on the surface of the doubling and twisting parts and equipment, resulting in problems such as broken wires, poor winding, thick sections, and increased defects. If the temperature and humidity are high, the moisture on the surface of the aramid fiber will increase, and the doubling and twisting will not be good, which will cause the subsequent weaving process to be hindered.

[0100] According to many experiments, the overall environment of high temperature and high humidity is ideal, especially for the two processes of doubling and twisting.

[0101] In terms of humidity control, a combination of high-grade full-range spray humidification with cold evaporative humidifier and high-grade local ultrasonic humidifier is used. The doubling table uses a mobile humidifier for mid-range humidification; the twisting table uses a cold evaporative humidifier for mid-range humidification in the air; the weaving rapier loom uses a combination of mobile humidifier mid-range humidification and ground sprinkling.

[0102] In terms of temperature control, a 5-horsepower air conditioner is used to adjust the temperature. The temperature of the doubling process is above 20°C and the relative humidity is above 60%; the temperature of the twisting process is above 22°C and the relative humidity is above 70%; the temperature of the weaving process is above 22°C and the relative humidity is above 63%.

[0103] 2) Parallel process

[0104] Stainless steel microfilaments as fine as 0.035mm and aramid filaments are first paralleled on the paralleling machine, and the yarn number ratio is 2:1. Metal grooved drums are used to reduce static electricity generation, increase the quantitative filament tension disk, and the paralleling speed is set to 300m / min at a medium speed, and the tension is controlled at a large tension. Handle with care during operation, keep the site clean, prevent flying flowers and powder from attaching to the bobbin, drop the bobbin into the AGV smart car and store it with a cover. The yarn structure obtained is similar to the wrapped yarn, the outer layer of stainless steel microfilaments is evenly wound as the decorative thread according to the twist setting, and the inner layer of aramid filaments is the baseline, so that the aramid and stainless steel microfilaments are evenly wound to obtain multi-cylinder untwisted multifilaments.

[0105] 3) Heat setting process

[0106] The multi-tube untwisted multifilament is heat-set to prevent the strands from twisting during the twisting process. The high-temperature oven is used for setting at 90°C under vacuum for 1 hour.

[0107] 4) Twisting process

[0108] The multi-cylinder untwisted multifilaments are twisted using a double twisting machine, and an anti-winding grooved cylinder is used to prevent excessive tension from abrading the surface structure of the yarn and producing powder. The twist is set to 50T / 10cm, the winding tension compensation is set to 1N, and the machine spindle speed is set to 6000r / min. This parameter effectively prevents the stainless steel microfilaments with a small elongation at break from falling off and slipping. Compared with the strength of each single wire, the breaking strength of the composite twisted yarn effectively increases the twist direction. According to the winding direction trend of the untwisted multifilament when paralleling, the corresponding twist direction is selected so that the gyration forces between the single wires offset each other and reduce the elastic loss of the composite twisted yarn. In addition, the derailment of the belt disc needs to be corrected every 30 minutes to reduce the equipment failure rate and downtime rate, improve production efficiency, and obtain multi-cylinder composite twisted yarn.

[0109] 5) Heat setting process

[0110] The multi-tube composite twisted yarn is heat-set again to reduce the wear of aramid fiber and the large stiffness of the yarn. After twisting, the twisting and winding force is large, the strands are severely twisted, and the phenomenon of small braid yarn appears, so as to avoid affecting the subsequent process. It is placed in a high-temperature oven at 120℃ vacuum for 3 hours to set, so as to reduce the twisting of the composite twisted yarn and the inability to neutralize the internal stress in time.

[0111] 6) Sizing process

[0112] The multi-drum composite twisted yarn is sized using a fully automatic single yarn sizing machine, double-immersion double-pressure sizing method and double-cage hot air drying method. The sizing speed is 40m / min, the winding tension is 210N, the feeding tension is 100N, the unwinding tension is 300N, the pre-drying temperature is 120℃, the main drying temperature is 100℃, and the weaving shaft should be tightly wound. The workshop temperature is 25℃-30℃ during sizing, and the relative humidity is controlled at 65%-70%. Before sizing, add a large twisted wire between the shafts, and add a small twisted wire between the two adjacent yarns when warping and dropping the shaft. After dry splitting, the adjacent yarns will reduce adhesion, which is conducive to splitting.

[0113] The slurry is: modified starch, PVA1799, acrylic acid, antistatic agent and smoothing agent, with a mass ratio of 6:2:1:1. Pour it into a beaker and place it on a magnetic stirrer. Stir it thoroughly for 10 minutes to dissolve it. This can effectively solve problems such as strong hydrophobicity, smooth surface, and poor cohesion between fibers, avoid multiple stretching, bending, and impact, reduce the breakage rate, increase the fit of the hairiness, and improve the smoothness.

[0114] 7) Weaving process

[0115] The multi-cylinder composite twisted yarn is woven using a rapier loom with a reed number of 70. Three warp yarns are inserted into each reed. The warp yarn is selected from the composite twisted yarn after sizing, and the weft yarn is selected from the composite twisted yarn without sizing. The warp density is 210 yarns / 10cm, the weft density is 260 yarns / 10cm, the warp tightness is 73.09%, the weft tightness is 82.04%, and the total tightness is 95.53%. The machine pattern selects a plain weave with precise warp and weft interweaving, with a weft shrinkage of 1.33%, a warp shrinkage of 1.64%, a piece length of 18cm, and a width of 15cm.

[0116] 8) Desizing process

[0117] Put the sample cloth into clean water, boil it for 15-20 minutes, then take it out, rinse the sample yarn with clean water until the surface of the sample cloth is clean, then put the sample cloth into the drying oven, dry it to a constant weight and then take it out.

[0118] The sizing process in this method makes the produced fabric have the following characteristics:

[0119] 1. As a warp, it has strong intrinsic strength;

[0120] 2. Improve the wear resistance of warp yarn;

[0121] 3. Make the yarn surface hairiness more flatter and improve wear resistance;

[0122] 4. It can relieve the internal stress of yarn caused by twisting, which is convenient for subsequent weaving.

Claims

1. A preparation process of a multifunctional special workwear fabric, characterized in that: The preparation process is used to prepare a multifunctional special workwear fabric, the multifunctional special workwear fabric comprising an inner skin-friendly layer (1), an intermediate functional layer (2), and an outer reinforcement layer (3), wherein the inner skin-friendly layer (1), the intermediate functional layer (2), and the outer reinforcement layer (3) are arranged in different ways; The inner skin-friendly layer (1) and the outer reinforcement layer (3) are respectively located on the inner and outer sides of the middle functional layer (2); the inner skin-friendly layer (1) is made of moisture-absorbing and perspiration-wicking fiber material; The inner skin-friendly layer (1) is the reference layer with a direction of 0° and is placed on the first layer of the fabric. The middle functional layer (2) is adjusted to a direction of 45° and is placed on the second layer of the fabric. The outer reinforcement layer (3) is adjusted to a direction of 90° and is placed on the third layer of the fabric. The material of the intermediate functional layer (2) and the outer reinforcement layer (3) are both stainless steel microfilaments with a diameter of 0.035 mm and aramid filaments which are twisted and composited into a line and woven into a fabric; The ratio of the number of strands of the stainless steel microfilaments to the aramid filaments is: 1:1 or 2:1; The preparation process comprises the following steps: S1: Production environment setting: production machine segmentation control, production site temperature and humidity control; S2: doubling process: stainless steel microfilaments as fine as 0.035 mm and aramid filaments are first doubling on a doubling machine, with the yarn number ratio of 1 to 2:1 and the doubling speed set at a medium speed of 300 m / min to obtain untwisted multifilaments; S3: Heat setting process 1: heat setting the multi-tube untwisted multifilament yarn in a high temperature oven at 90°C under vacuum for 1 hour; S4: Twisting process: (1) Use a two-for-one twister to twist the multi-tube untwisted multifilament yarn, and use an anti-winding grooved drum to prevent excessive tension from abrading the yarn surface structure and producing powder; (2) According to the winding direction trend of the untwisted multifilament during paralleling, the corresponding twist direction is selected so that the gyration forces between the single filaments offset each other and reduce the elastic loss of the composite twisted yarn; (3) The derailment of the belt disc under the twister needs to be corrected every 30 minutes to reduce the equipment failure rate and downtime rate, improve production efficiency, and obtain multi-tube composite twisted yarn; S5: Heat setting process 2: The multi-tube composite twisted yarn is heat set again and placed in a high temperature oven at 120 °C under vacuum for 3 h to set; S6: Sizing process: (1) The multi-tube composite twisted yarn is sizing treated by using a fully automatic single yarn sizing machine, double dipping and double pressing sizing method and double rotating cage hot air drying method; (2) When sizing, the workshop temperature is 25℃-30℃, and the relative humidity is controlled at 65%-70%. Before starting the sizing process, add a large twisted wire between the shafts; (3) When warping and beaming, add a small twisted wire between two adjacent yarns; S7: Weaving process: Weaving the multi-tube composite twisted yarn, using a rapier loom, selecting a reed number of 70, inserting three warp yarns into each reed, the warp yarns are composite twisted yarns after sizing, and the weft yarns are composite twisted yarns without sizing; S8: Desizing process: Put the sample cloth into clean water, boil for 15-20 minutes, then take it out, rinse the sample yarn with clean water until the surface of the sample cloth is clean, then put the sample cloth into the oven, dry it to a constant weight and then take it out.

2. The preparation process of a multifunctional special workwear fabric according to claim 1, characterized in that: The twist (1) in S4 is set to 50T / 10cm, the winding tension compensation is set to 1N, and the machine spindle speed is set to 6000r / min.

3. The preparation process of a multifunctional special workwear fabric according to claim 1, characterized in that: In the above-mentioned S6, (1) the sizing speed is 40 m / min, the winding tension is 210 N, the feeding tension is 100 N, the unwinding tension is 300 N, the pre-baking temperature is 120° C., and the main baking temperature is 100° C.

4. The preparation process of a multifunctional special workwear fabric according to claim 1, characterized in that: The slurry in the S6 is: modified starch, PVA1799, acrylic acid, antistatic agent and smoothing agent, with a mass ratio of 6:2:1:1:

1. It is poured into a beaker and placed on a magnetic stirrer, and is fully stirred for 10 minutes to dissolve.

5. The preparation process of a multifunctional special workwear fabric according to claim 1, characterized in that: The S7 has a warp density of 210 strands / 10cm, a weft density of 260 strands / 10cm, a warp tightness of 73.09%, a weft tightness of 82.04%, and a total tightness of 95.53%. The machine pattern selects a plain weave with tight warp and weft interweaving, a weft shrinkage of 1.33%, a warp shrinkage of 1.64%, a piece length of 18cm, and a width of 15cm.

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