Light and thin anti-light penetration yoga pants fabric and production process thereof

Abstract

The application discloses a light and thin anti-light-transmitting yoga pants fabric and a production process thereof. The light and thin anti-light-transmitting yoga pants fabric comprises a nylon yarn composed of a core layer and a skin layer, the skin layer is wrapped around the periphery of the core layer, in the cross section of the nylon yarn, the skin layer accounts for 60-80% of the total area, and the core layer accounts for 20-40% of the total area; the core layer is composed of 3-5% nanometer titanium dioxide, 2-3% nanometer zinc oxide, 2-3% nanometer microporous silicon dioxide and the balance of polyamide in terms of weight percentage of dry weight; and the skin layer is composed of 1-2% nanometer titanium dioxide and 98-99% polyamide. The production process comprises spinning, manufacturing and post-finishing. The obtained nylon yarn with the skin-core structure has the following advantages: on the one hand, the weaving structure improves the physical shielding and anti-light-transmitting performance of the fabric; and on the other hand, the weaving process improves the anti-snagging performance of the fabric.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of textile fabrics, and particularly relates to a light and thin anti-light-transmitting yoga pants fabric and a production process thereof. BACKGROUND

[0002] With the change of lifestyle, people pay more and more attention to their own health. Yoga, as a basic means of physical exercise, is a sport project with low entry, simple and easy to learn, and is widely loved by people, especially women. In sports, having a comfortable and high-function yoga pants can greatly improve the comfort of sports. Looking at the market, the existing yoga pants fabric materials are mainly polyester fiber and nylon. The color of the fabric is mainly concentrated in dark colors, and the fabric is generally thick. At the same time, the fabric has poor anti-picking performance and is hot. Based on the above problems, the present application provides an anti-light-transmitting fabric, which can reduce the fabric weight and achieve good shielding and anti-light-transmitting function. The fabric has excellent anti-ultraviolet and anti-picking performance through the design of yarn and structure, reducing the damage of ultraviolet light to the body when wearing outdoors. SUMMARY

[0003] In view of the technical problem that the existing yoga pants use double-sided cloth material which is tight, thick, hot and has poor anti-picking performance to achieve the characteristics of not transmitting light and no trace, the present application provides a light and thin anti-light-transmitting yoga pants fabric and a production process thereof.

[0004] The technical scheme of the present application is as follows:

[0005] A light and thin anti-light-transmitting yoga pants fabric comprises nylon yarn composed of a core layer and a skin layer, the skin layer is wrapped around the periphery of the core layer, in the cross section of the nylon yarn, the skin layer accounts for 60-80% of the total area, and the core layer accounts for 20-40% of the total area, the core layer is composed of 3-5% nanometer titanium dioxide, 2-3% nanometer zinc oxide, 2-3% nanometer microporous silicon dioxide and the balance of polyamide in terms of weight percentage of dry weight, and the skin layer is composed of 1-2% nanometer titanium dioxide and 98-99% polyamide.

[0006] The production process of the above-mentioned anti-light-transmitting yoga pants fabric comprises the following steps:

[0007] (1) The powders of various substances are blended according to the composition of the core layer, and then the blended material is extruded after being melted by a spinning screw extruder, cooled, drawn into a strip and cut into granular particles, and then the granular particles are dried to prepare a nylon master batch containing titanium dioxide, zinc oxide and silicon dioxide to prepare a core layer master batch;

[0008] (2) The powder of each substance is blended according to the composition of the above-mentioned skin layer, extruded after melting through a spinning screw extruder, cut into granular particles after cooling and drawing into a strip, and then the granular particles are dried to obtain matt polyamide chips, and the chip material of the skin layer is prepared;

[0009] (3) The core layer master batch obtained in step (1) and the chip material of the skin layer obtained in step (2) are respectively put into a production line, melted and extruded through respective screw extruders, passed through a melt pipe and a metering pump, then weighed according to the area ratio of the skin layer 60%-80% and the core layer 20%-40%, passed through a skin-core structure spinneret assembly to form a filament yarn, and then cooled, wound and wound into a bobbin through a ring blowing air to form a raw silk; after drawing, twisting and heat setting through post-spinning, the raw silk is wound, packaged, and a skin-core structure nylon yarn with a fineness of 30-100D is prepared;

[0010] (4) The nylon yarn and the nylon yarn obtained in step (3) are knitted in a use amount ratio of 20%-40%:60%-80%, 3 guide bars are used for knitting, GB1 and GB2 are used to knit nylon yarn, and GB3 is used to knit spandex yarn, and the threading mode is:

[0011] GB1: 1-0 / 0-1 / / , 1 is worn in two spaces; the yarn knitted by the front combing plays a role in consolidating the fabric, and the mode of 1 wearing 2 spaces can maintain the lightness of the fabric;

[0012] GB2: 2-3 / 1-0 / / , full threading;

[0013] GB3: 0-2 / 3-1 / / , full threading.

[0014] Further, in step (4), the fineness of the spandex yarn is 20-40D.

[0015] Further, the let-off amount of GB2 is 1408mm.

[0016] Further, in step (4), the knitting is carried out by using a Karl Mayer warp knitting machine, the machine number is 32G, and the equipment speed is 1000-1400r / min.

[0017] Further, it further includes a finishing process after step (4), and the finishing process is:

[0018] (a) Fabric refining; the water washing oil removal process of the flat water washing machine can make the fabric in a tension-free state, reducing the overstretching of the fabric; during processing, the fabric is immersed in the refining liquid, i.e. 2-3g / L oil removal agent, 1-2g / L caustic soda and 1g / L chelating agent are added in the refining tank; the fabric after refining is dehydrated and dried before entering the next process;

[0019] (b) Pre-setting of the grey fabric; after weaving, the elastic fiber in the longitudinal direction shrinks the loops together, so the effect of pre-setting is of great significance to the fixation of the elasticity of the spandex loops; if the pre-setting effect of the spandex loops is not good, the surface flatness of the fabric is poor, and sparse longitudinal strip effects are easily formed, which affect the quality of the fabric; therefore, in the setting process, we adopt a two-time pre-setting process, the machine temperature is set to 150-170℃ (preferably 160℃) in the first pre-setting, and the speed is 33-37m / min (preferably 35m / min), in the second pre-setting, the machine temperature is 180-200℃ (preferably 190℃), and the speed is 38-42m / min (preferably 40m / min), through the two-time pre-setting process, the stability of the produced fabric is good, the elasticity and stretch recovery rate are high, and the wearability of the fabric is greatly improved;

[0020] (c) Dyeing; in this link, the warp dyeing process is adopted. Since the fabric is used for yoga pants, the fabric is stretched in size during wearing, so the uniformity of the fabric dyeing is also improved. In order to obtain a fabric with good dyeing uniformity, it is necessary to reduce the inner and outer layer color difference and the frequency of dyeing defects that occur in warp dyeing. First, we control the stable winding density when winding on the warp beam, so that the dyeing can fully enter the inner layer, and the winding density of the fabric wound on the warp beam is 0.28-0.30kg / m 3 (preferably 0.29kg / m 3 ). Secondly, the temperature during dyeing is 94-96℃ (preferably 95℃), and 2-4g / L leveling agent (preferably 3g / L) is added. When the dye is added to the dyeing vat, we adopt a two-step temperature rising curve, the first stage temperature rising rate is 1-1.4℃ / min, when the temperature rises to 75-80℃, we adopt a temperature rising rate of 1.5-2℃ / min to speed up the temperature rising. The two-stage temperature rising curve can reduce the dyeing rate of nylon, so that the dye molecules can fully enter the fiber, thereby improving the dyeing effect and reducing the occurrence of dyeing defects;

[0021] (d) Fabric drying; after the fabric comes out of the dyeing vat, it is dried by a drying machine. The drying temperature is set to 120-150℃ (preferably 140℃), and the speed of the drying machine is 18-22m / min (preferably 20m / min);

[0022] (e) Product setting; after drying, the fabric is passed through a setting machine to complete the last product setting link, i.e. the anti-light transmission yoga fabric of the present application is obtained. In the product setting, the setting temperature is 160-180℃ (preferably 170℃), and the speed of the setting machine is 38-42m / min (preferably 40m / min).

[0023] The nylon yarn with the core-sheath structure obtained in step (3) of the present application has a round cross section for the outer layer of the spinneret shape of the sheath-core fiber, and the core part of the inner layer has a special cross section, which is nested with each other. The core layer is an eight-petal-shaped special cross section, and the sheath layer wraps the core layer in the form of a circle (as shown in the figure). Because the specific surface of the core layer yarn is increased, more light is diffused and reflected when the light enters, thereby greatly reducing the light directly penetrating the yarn. Figure 1

[0024] The present application has the following beneficial effects:

[0025] (1) The nylon yarn with the core-sheath structure obtained in the present application has a difference in molecular density between the inner and outer layers, which causes the light to pass through the yarn not strictly according to the principle of uniform reflection and refraction, but to first reflect and refract in the sheath layer, and the refracted optical fiber is then subjected to optical refraction and reflection again after passing through the core layer. This multiple optical fiber filtering greatly reduces the light penetrating the fiber. Titanium dioxide and zinc oxide are a broad-spectrum ultraviolet shielding agent, which has good shielding effect on UVA ultraviolet light with a wavelength of 320-400 nm and UVB ultraviolet light with a wavelength of 280-320 nm; while other organic ultraviolet absorbers only have absorption effect on UVA and UVB. The refractive index of titanium dioxide to light is 2.71, and the refractive index of zinc oxide to light is 2.03, which has obvious effect on light refraction. The combination of the two materials has absorption, reflection and scattering effects on ultraviolet light. The microporous silica nanomaterial has a porosity of 95%, and the nano-porous structure makes its thermal conductivity low. Thermal conduction is mainly determined by two factors: solid conduction and radiation conduction. The presence of titanium dioxide and zinc oxide makes the material have a certain light-shielding property, thereby reducing the thermal radiation effect of the silica material, and the thermal conductivity is lower, which has good heat insulation effect. When the clothes made of the yarn absorb heat under the sunlight, the heat will not be conducted to the skin surface, thereby reducing the heating rate of the clothes.

[0026] ​(2) the woven structure of the application improves the physical shielding and anti-penetration performance of the fabric. The GB2 yarn is fed at an optimal amount, and the GB2 yarn serves as the base yarn of the fabric. The loops formed by the yarn on the GB3 shrink due to tension, and the connecting extension lines between the loops are in a relaxed state and slightly raised, which greatly increases the porosity of the fabric. The coverage of the GB2 yarn is increased due to the raised extension lines, and when the fabric is stretched during wearing, the GB2 yarn is stretched from the raised state to the flat state, and the fabric still has sufficient coverage during this process and does not appear to be transparent, which reduces the embarrassing phenomenon that the conventional fabric leaks the clothes in the inner layer due to the increased distance between the loops caused by stretching, and the fabric has good shielding and anti-penetration performance. On the other hand, the weaving process improves the anti-snagging performance of the fabric. When the fabric is affected by a sharp object and appears to be snagged, we can pull the straight and horizontal loops of the fabric to return the snagged yarn to the fabric, so that the fabric surface is flat as before, and the anti-snagging performance of the fabric is improved. The GB1 plays a role in consolidation and can avoid the problem of large-area loop scattering caused by the snagging of a yarn. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The structure of the core-sheath yarn obtained by the application is shown in the figure.

[0028] Figure 2 The GB1 inlay motion schematic diagram is shown in the figure.

[0029] Figure 3 The GB2 inlay motion schematic diagram is shown in the figure.

[0030] Figure 4 The GB3 inlay motion schematic diagram is shown in the figure. DETAILED DESCRIPTION

[0031] The application will be further described in detail below in conjunction with specific embodiments, but the application is not limited thereto.

[0032] Example 1

[0033] A production process of a light and thin anti-penetration light yoga pants fabric includes the following steps:

[0034] (1) according to the weight percentage of dry weight, 5% titanium dioxide, 2% zinc oxide, 3% nano-sized particle powder of ground silica and 90% polyamide powder are blended, then the blended material is extruded after melting by a spinning screw extruder, stretched by cooling, and cut into granular particles, then the granular particles are dried to prepare a nylon master batch containing titanium dioxide, zinc oxide and silica, and a core layer master batch is prepared;

[0035] (2) according to the weight percentage of dry weight, 2% of titanium dioxide powder particles and 98% of polyamide powder are blended, extruded after melting through a spinning screw extruder, cut into granular particles after cooling and drawing into a strip, then the granular particles are dried to obtain matt polyamide chips, and the chip material of the skin layer is prepared;

[0036] (3) the core layer master batch obtained in step (1) and the chip material of the skin layer obtained in step (2) are respectively put into the production line, melted and extruded through the respective screw extruders, passed through the melt pipeline and the metering pump, then weighed according to the area ratio of the skin layer 70% and the core layer 30%, passed through the skin-core structure spinneret assembly to form a filament yarn, and then cooled, wound and wound after ring blowing to form a raw silk; after drawing, twisting and heat setting, the raw silk is wound and packed to obtain a skin-core structure nylon yarn;

[0037] (4) weaving is carried out by using Karl Mayer warp knitting machine, the machine number is 32G, the equipment speed is 1200r / min, and the nylon yarn and the nylon yarn obtained in step (3) are woven in a use amount ratio of 30%:70%, 2 guide bars are used for weaving, GB1 and GB2 are used for weaving nylon yarn, and GB3 is used for weaving nylon yarn, and the yarn feeding mode is:

[0038] GB1: 1-0 / 0-1 / / , 1 is worn in two spaces; the yarn of the front comb weaving plays a role in consolidating the fabric, and the mode of 1 wearing 2 spaces can maintain the lightness of the fabric;

[0039] GB2: 2-3 / 1-0 / / , full wear; the let-off amount of GB2 is 1408mm;

[0040] GB3: 0-2 / 3-1 / / , full wear;

[0041] (5) the greige fabric is refined; the water washing oil removal process of the flat water washing machine is used, and when processing, the fabric is immersed in the refining liquid, that is, 2g / L of non-ionic environmentally friendly emulsified / dispersed oil removal agent, 2g / L of soda ash and 1g / L of organic phosponate chelating agent are added in the refining tank; after refining, the fabric is dehydrated and dried to enter the next process;

[0042] (6) the greige fabric is pre-set; the process flow of 2 times of pre-setting is adopted, the machine temperature is set to 160℃ in the first pre-setting, and the speed is 35m / min, in the second pre-setting, the machine temperature is 190℃, and the speed is 40m / min;

[0043] (7) dyeing; the warp dyeing process is adopted, first, the winding density of the fabric wound on the warp beam is controlled to be 0.29kg / m 3Secondly, the dyeing temperature is controlled at 95℃, and 3g / L leveling agent non-ionic DM2209 is added at the same time. When the dye is added to the dyeing vat, a two-gradient step-up temperature curve is adopted. The first stage of the temperature rising rate is 1℃ / min. When the temperature rises to 80℃, the temperature rising rate is 1.5℃ / min to the dyeing temperature 95℃;

[0044] (8) Fabric drying; drying treatment is carried out by using a drying machine, the temperature of the drying machine is 140℃, and the speed of the drying machine is 20m / min;

[0045] (9) Product setting; after the dried fabric passes through a setting machine and a product setting link, a finished product is obtained. During the product setting, the setting temperature is 170℃, and the speed of the setting machine is 40m / min.

[0046] Example 2

[0047] A production process of a light and thin anti-light-transmitting yoga pants fabric includes the following steps:

[0048] (1) According to the weight percentage of dry weight, 4% titanium dioxide, 3% zinc oxide, and 2% nano-sized particle powder of ground silica are blended with 91% polyamide powder. Then, the blended material is extruded after melting by a spinning screw extruder. After cooling and drawing into a strip, it is cut into granular particles. Then, the granular particles are dried by drying treatment to produce a nylon master batch containing titanium dioxide, zinc oxide, and silica, thereby producing a core layer master batch;

[0049] (2) According to the weight percentage of dry weight, 1% titanium dioxide powder particles are blended with 99% polyamide powder. After melting by a spinning screw extruder, it is extruded. After cooling and drawing into a strip, it is cut into granular particles. Then, the granular particles are dried by drying treatment to obtain a matt polyamide chip, thereby producing a chip material of a skin layer;

[0050] (3) The core layer master batch obtained in step (1) and the chip material of the skin layer obtained in step (2) are respectively put into the production line, melted and extruded by the respective screw extruders, passed through the melt pipeline and the metering pump, and then weighed according to the area ratio of the skin layer 70% and the core layer 30%. After that, the yarn is formed by the skin-core structure spinneret assembly, and then cooled, wound, and wound after the ring blowing. The resulting yarn is drawn, twisted, and heat set after the post-spinning, wound, packaged, and a skin-core structure nylon yarn is obtained.

[0051] (4) Weaving is carried out by using Karl Mayer warp knitting machine, the machine gauge is 32G, the equipment rotating speed is 1000 r / min, the nylon yarn and the polyamide yarn obtained in step (3) are woven in a ratio of 30%:70%, two guide bars are used for weaving, GB1 and GB2 weave polyamide yarn, GB3 weaves nylon yarn, and the threading mode is as follows:

[0052] GB1: 1-0 / 0-1 / / , two empty; the yarn woven by the front combing plays a role in consolidating the fabric, and the mode of 1 threading 2 empty can keep the fabric light and thin;

[0053] GB2: 2-3 / 1-0 / / , full threading; the let-off of GB2 is 1408 mm;

[0054] GB3: 0-2 / 3-1 / / , full threading;

[0055] (5) Rinsing of the fabric; the water washing oil removal process of the flat washing machine is used, and when processing, the fabric is immersed in the refining liquid, that is, 3 g / L of non-ionic environmentally friendly emulsified / dispersed oil removal agent, 1 g / L of soda ash and 1 g / L of organic chelating agent of phosphonate are added in the refining tank; after the fabric is refined, it is dehydrated and dried before entering the next process;

[0056] (6) Pre-setting of the fabric; the process flow of 2 times of pre-setting is used, the machine temperature is set to 150 DEG C in the first pre-setting, and the speed is 36 m / min, in the second pre-setting, the machine temperature is 180 DEG C, and the speed is 38 m / min;

[0057] (7) Dyeing; the warp beam dyeing process is used, firstly, when winding on the warp beam, the winding density of the fabric on the warp beam is controlled to be 0.29 kg / m 3 , secondly, the dyeing temperature is controlled to be 96 DEG C, and 2 g / L of leveling agent non-ionic DM2209 is added at the same time, when the dye is added to the dyeing vat, a two-gradient stepwise temperature rising curve is used, the first stage rising rate is 1.2 DEG C / min, when the temperature rises to 80 DEG C, the rising rate is 1.5 DEG C / min to the dyeing temperature 96 DEG C;

[0058] (8) Drying of the fabric; the drying machine is used for drying treatment, the temperature of the drying machine is 150 DEG C, and the speed of the drying machine is 22 m / min;

[0059] (9) Product setting; after drying, the fabric passes through the first setting machine and the product setting link to obtain the finished product; in the product setting, the setting temperature is 160 DEG C, and the speed of the setting machine is 38 m / min.

[0060] Example 3

[0061] A production process of a light and thin anti-light penetration yoga pants fabric, comprising the following steps:

[0062] (1) according to the weight percentage of dry weight, 3% titanium dioxide, 3% zinc oxide, 2% nano-sized particle powder of silicon dioxide and 92% polyamide powder are blended, then the blended material is extruded after melting by a spinning screw extruder, and then the material is cut into granular particles after cooling and drawing into a strip, then the granular particles are dried to obtain a core layer master batch containing titanium dioxide, zinc oxide and silicon dioxide;

[0063] (2) according to the weight percentage of dry weight, 2% titanium dioxide powder particles and 98% polyamide powder are blended, then the blended material is extruded after melting by a spinning screw extruder, and then the material is cut into granular particles after cooling and drawing into a strip, then the granular particles are dried to obtain a matt polyamide chip, which is used to make a skin layer chip material;

[0064] (3) the core layer master batch obtained in step (1) and the skin layer chip material obtained in step (2) are respectively put into a production line, melted and extruded by a screw extruder, then passed through a melt pipe and a metering pump, then weighed according to the area ratio of the skin layer 70% and the core layer 30%, and then passed through a skin-core structure spinneret assembly to form a filament yarn, and then cooled, wound and wound into a raw silk after ring blowing; the raw silk is drawn, twisted and heat set after post-spinning, and then wound, packaged to obtain a skin-core structure nylon yarn;

[0065] (4) weaving is carried out by using a Karl Mayer warp knitting machine, the machine number is 32G, the equipment speed is 1500r / min, the nylon yarn and the nylon yarn obtained in step (3) are woven in a ratio of 30%:70%, 2 guide bars are used to weave, GB1 and GB2 are used to weave nylon yarn, and GB3 is used to weave spandex yarn, and the threading mode is:

[0066] GB1: 1-0 / 0-1 / / , two empty; the yarn woven by the front combing plays a role in consolidating the fabric, and the mode of 1 threading 2 empty can keep the fabric light and thin;

[0067] GB2: 2-3 / 1-0 / / , full threading; the let-off of GB2 is 1408mm;

[0068] GB3: 0-2 / 3-1 / / , full threading;

[0069] (5) the raw fabric is refined; the water washing oil removal process of a flat water washing machine is used, and when processing, the fabric is immersed in a refining liquid, that is, 3g / L of non-ionic environmentally friendly emulsified / dispersed oil removal agent, 2g / L of soda ash and 1g / L of organic chelating agent of phosphonate are added in the refining tank; after refining, the fabric is dehydrated and dried before entering the next process;

[0070] (6) Fabric pre-setting; 2 times of pre-setting process is adopted, the first pre-setting machine temperature is set to 160 DEG C, and the speed is 35 m / min, in the second pre-setting, the machine temperature is 190 DEG C, and the speed is 40 m / min;

[0071] (7) Dyeing; adopting warp dyeing process, first, when winding the warp, the winding density of the fabric wound on the warp is controlled to be 0.29 kg / m 3 , second, the dyeing temperature is controlled to be 94 DEG C, and 3 g / L leveling agent nonionic DM2209 is added, when the dye is added to the dyeing vat, 2 gradient stepwise temperature rising curves are adopted, the first stage temperature rising rate is 1.4 DEG C / min, when the temperature rises to 80 DEG C, the temperature rising rate is 1.8 DEG C / min to the dyeing temperature 94 DEG C;

[0072] (8) Fabric drying; drying treatment is carried out by using a drying machine, the temperature of the drying machine is 130 DEG C, and the speed of the drying machine is 18 m / min;

[0073] (9) Product setting; after the fabric is dried, the fabric is subjected to a setting machine and a product setting process to obtain a finished product; in the product setting process, the setting temperature is 180 DEG C, and the speed of the setting machine is 42 m / min.

[0074] Fabric performance index test results

[0075] Fabric shielding and penetration resistance test

[0076] Reference test method: visual shielding test method in appendix A and appendix B of HX / T 51009-2015; two kinds of fabrics with the same fabric composition, gram weight and post-processing are selected, sample 1 is a conventional warp pile structure fabric, and sample 2 is the fabric obtained in example 1 of the application, then deep, medium and light three colors are selected to compare the penetration resistance difference of the two kinds of fabrics; the higher the grade, the worse the penetration resistance, the lower the grade, the better the penetration resistance, and 5 is the worst, and 1 is the best.

[0077]

[0078] From the above comparison results, it can be seen that the penetration resistance of the fabric of the application is much better than that of the ordinary fabric.

[0079] Fabric anti-picking performance test

[0080] Three kinds of fabrics are selected for comparative test, and sample a and sample b are comparative samples. Sample a is a weft-knitted double-sided structure yoga pants fabric, and the fabric composition is 81% polyamide + 19% spandex; sample b is a warp-knitted pile structure yoga pants fabric, and the fabric composition is 75% polyamide + 25% spandex; sample c is the fabric obtained in Example 1 of the present application. The fabric compositions, gram weights and other basic information of sample a, sample b and sample c are the same, and the structures are different.

[0081] Test method: GB / T 11047, nail hammer method for evaluating the snagging performance of textile fabrics. The higher the test level, the better the anti-snagging performance, and the level 5 is the best and the level 1 is the worst.

[0082]

[0083] As can be seen from the above table, the transverse anti-snagging performance of the fabric with the structure of the present application is level 4, and the straight anti-snagging performance is level 4-5, which are better than those of the comparative samples, indicating that the structure of the present application has a good improvement effect on the anti-snagging performance of the fabric.

[0084] Anti-ultraviolet test of fabric

[0085] Three kinds of fabrics are selected for comparative test, and sample I and sample II are comparative samples. Sample I, sample II and sample III are selected from blue fabrics of the same color system. The fabric of sample I is a weft-knitted plain structure, and the fabric composition is 80% polyamide + 20% spandex; sample II is a warp-knitted pile structure, and the fabric composition is 78% polyamide + 22% spandex; sample III is the fabric obtained in Example 1 of the present application.

[0086] Test method:

[0087] The blocking rate test method is referred to the test method of Guangdong Textile Inspection Institute, GTTC / GF TM 091-2002, test method for ultraviolet-visible-near infrared blocking rate of textile. The higher the data, the better the blocking effect of ultraviolet.

[0088] Anti-ultraviolet performance test method: GB / T 18830-2009, evaluation of anti-ultraviolet performance. The higher the data, the better the anti-ultraviolet effect.

[0089]

[0090]

[0091] As can be seen from the table, the blocking rate of the fabric of the present application to ultraviolet is 100%, and the UPF value is also higher than that of other fabrics, and the clothes made of the fabric have a good anti-ultraviolet effect.

Claims

1. A production process of light and thin and anti-light penetration yoga pants fabric, characterized by, The light, thin and anti-light penetrating yoga pants fabric comprises nylon yarn composed of a core layer and a skin layer, the skin layer is wrapped around the periphery of the core layer, in the cross section of the nylon yarn, the skin layer accounts for 60-80% of the total area, and the core layer accounts for 20-40% of the total area, the core layer is composed of 3-5% nanometer titanium dioxide, 2-3% nanometer zinc oxide, 2-3% nanometer microporous silicon dioxide and the balance of polyamide in terms of weight percentage of dry weight, and the skin layer is composed of 1-2% nanometer titanium dioxide and 98-99% polyamide; The production process comprises the following steps: (1) according to the composition of the core layer, the powders of various substances are blended, then the mixed material is melted and extruded through a screw extruder, cut into particles after cooling and drawing into strips, and then the particles are dried to obtain nylon master batch containing nanometer titanium dioxide, nanometer zinc oxide and nanometer microporous silicon dioxide, thereby preparing the core layer master batch; (2) according to the composition of the skin layer, the powders of various substances are blended, then the mixed material is melted and extruded through a screw extruder, cut into particles after cooling and drawing into strips, and then the particles are dried to obtain matt polyamide chips, thereby preparing the chip material of the skin layer; (3) the core layer master batch obtained in step (1) and the chip material of the skin layer obtained in step (2) are respectively put into the production line, melted and extruded through respective screw extruders, passed through a melt pipe and a metering pump, then weighed according to the proportion of the total area of the yarn cross section, passed through a skin-core structure spinneret assembly to form skin-core fibers, and then cooled, wound and wound into a bobbin through a ring blowing machine, thereby preparing the raw silk; after drawing, twisting and heat setting, the prepared raw silk is wound, packaged, and the nylon yarn with a skin-core structure is prepared, and the yarn fineness is 30-100D; (4) the nylon yarn and the nylon yarn obtained in step (3) are knitted in a usage ratio of 20-40%:60-80%, three guide bars are used for knitting, GB1 and GB2 are used for knitting nylon yarn, and GB3 is used for knitting spandex yarn, and the threading mode is as follows: GB1: 1-0 / 0-1 / / , 1 thread 2 empty; the yarn knitted by the front combing plays a role in consolidating the fabric, and the 1 thread 2 empty mode can keep the fabric light and thin; GB2: 2-3 / 1-0 / / , full threading; GB3: 0-2 / 3-1 / / , full threading; In step (3), the outer layer of the skin-core fiber forming spinneret assembly of the nylon yarn with a skin-core structure is a circular cross section, and the core part of the inner layer is a special-shaped cross section, which is nested with each other; In step (3), the core layer of the nylon yarn with a skin-core structure is an eight-petal special-shaped cross section, and the skin layer wraps the core layer in a circular form.

2. The production process according to claim 1, characterized in that, In step (4), the fineness of the spandex yarn is 20-40D.

3. The production process according to claim 1, characterized in that, In step (4), Karl Mayer warp knitting machine is used for knitting, the machine number is 32G, and the equipment rotating speed is 1000-1400r / min.

4. The production process according to claim 1, characterized in that, It also comprises a finishing process, and the steps of the finishing process are as follows: (a) the greige fabric is refined; the water washing and oil removing process of the open-width washing machine is adopted, and during the processing, the fabric is immersed in the refining liquid, i.e. 2-3 g / L oil removing agent, 1-2 g / L soda ash and 1 g / L chelating agent are added into the refining tank; after the refining, the fabric is dehydrated and dried, and then enters the next process; (b) the greige fabric is pre-set; the process flow of 2 times of pre-setting is adopted, during the first pre-setting, the machine temperature is set to 150-170 ℃, and the speed is 33-37 m / min, during the second pre-setting, the machine temperature is 180-200 ℃, and the speed is 38-42 m / min; (c) dyeing; using a warp dyeing process, first, the winding density of the fabric wound on the warp beam is controlled to be 0.28-0.30 kg / m when the warp beam is wound 3 second, the dyeing temperature is controlled to be 94-96°C, and 2-4 g / L levelling agent is added at the same time, a two-gradient stepwise temperature rising curve is used when the dye is added to the dyeing vat, the first stage temperature rising rate is 1-1.4°C / min, when the temperature rises to 75-80°C, the temperature rising rate is 1.5-2°C / min to the dyeing temperature; (d) the fabric is dried; the drying machine is adopted for drying treatment, the temperature of the drying machine is 120-150 ℃, and the speed of the drying machine is 18-22 m / min; (e) the finished product is set; after the drying, the fabric passes through the once setting machine, and the last finished product setting link is completed, and the finished product light-proof yoga fabric is obtained; during the finished product setting, the setting temperature is 160-180 ℃, and the speed of the setting machine is 38-42 m / min.

5. A light, thin and anti-light penetration yoga pants fabric, characterized in that, obtained by the production process according to any one of claims 1 to 4.

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