Soft skin-fitting double-sided knitted fabric with super-large opening degree and preparation method of soft skin-fitting double-sided knitted fabric

Abstract

The invention discloses an ultra-large-opening soft skin-fitting double-sided knitted fabric and a preparation method thereof, and belongs to the technical field of textile, the key point of the technical scheme is that the preparation method of the ultra-large-opening soft skin-fitting double-sided knitted fabric comprises the following steps: S1, yarn preparation: the fabric comprises the following components in percentage by weight: 84% of chinlon and 16% of spandex; s2, gray cloth weaving: the length of the polyamide yarn is 22.5-26.5 cm / 100 stitches, the length of the spandex yarn is 6.5-7.5 cm / 100 stitches, and a weft knitting double-sided circular knitting machine is used for repeated weaving to obtain gray cloth fabric; s3, deoiling and drying the gray cloth; s4, pre-preparing gray cloth; s5, carrying out color fixation treatment after the gray cloth is dyed; s6, loosening and drying the cloth; s7, sanding is conducted; and S8, after-finishing and shaping the fabric to obtain the double-sided knitted fabric. The double-sided knitted fabric obtained by the application has the properties of super-large stretching opening, super softness, good skin fitting property, dryness, cotton feeling, air permeability, bony feeling and no soft collapse.

Description

Technical Field

[0001] The present application relates to the technical field of textiles, and particularly to a double-sided knitted fabric with an ultra-large opening and soft skin-friendly property and a preparation method thereof. Background Art

[0002] In recent years, the global sportswear market has shown a continuous growth trend. Therefore, sportswear represented by sportswear long sleeves, short sleeves, vests, short skirts, suspender skirts, etc. has become an important part of the sports market. Such fabrics basically fall into two categories: natural fiber fabrics and synthetic fiber fabrics. Among natural fibers, cotton, linen, silk, and wool, due to their respective limitations, cannot widely cover underwear fabrics with various types of requirements. Especially for sportswear fabrics with higher requirements for skin-friendliness, shape retention, support, and elasticity, it is difficult for natural fibers to meet perfect requirements. Therefore, synthetic fiber fabrics have become an ideal choice for such sportswear fabrics. Although conventional chemical fiber fabric sportswear makes sports more convenient, due to fabric performance limitations, such as not being soft and skin-friendly enough, being too soft and sagging when soft enough, having elasticity but being slightly tight, etc., these sportswear are not suitable as daily casual wearing options, restricting the wearing scenarios of sportswear. Summary of the Invention

[0003] In order to solve the problem that the fabrics in the prior art cannot take into account both soft skin-friendliness and a sense of structure, the present application provides a double-sided knitted fabric with an ultra-large opening and soft skin-friendly property and a preparation method thereof. The double-sided knitted fabric obtained in the present application has properties such as an ultra-large stretching opening, super softness, good skin-friendliness, dry and cottony breathability, and a sense of structure without sagging.

[0004] The first aspect of the present application is to provide a preparation method of a double-sided knitted fabric with an ultra-large opening and soft skin-friendly property, adopting the following technical solutions: A preparation method of a double-sided knitted fabric with an ultra-large opening and soft skin-friendly property, comprising the following steps: S1. Yarn preparation: The fabric comprises 84% by weight of polyamide and 16% by weight of spandex. The polyamide is the Orsheni series matte polyamide 66 low-elastic yarn of Yili Polyamide Technology Co., Ltd., and the spandex used is the 20D dyeable spandex H350A of Hyosung Korea. S2. Weaving the greige fabric: The length of the polyamide yarn is 22.5 - 26.5 cm / 100 needles, and the length of the spandex yarn is 6.5 - 7.5 cm / 100 needles. A greige fabric is obtained by repeatedly weaving with a 32-needle 34-inch weft knitting double-sided large circular knitting machine. S3. Degreasing and drying the greige fabric: Degrease the greige fabric and then set and dry it. S4. Pre-setting the greige fabric: The setting temperature is 196 - 200 °C, and the time is 12 - 17 s. S5. After the grey fabric is dyed, a color fixation treatment is carried out. The dyeing temperature is 103 - 107 °C and the time is 38 - 42 min; the color fixation conditions are 70 - 75 °C and the time is 18 - 20 min; S6. Relax the fabric and dry it; S7. Suede the fabric; S8. After-finish and shape the fabric to obtain a double-sided knitted fabric.

[0005] Preferably, the weft knitting double-sided large circular knitting machine is a German Mayer weft knitting double-sided large circular knitting machine with a rotational speed of 10 - 20 r / min.

[0006] By adopting the above technical solutions, in this application, by adjusting the ratio of nylon and spandex, the selection of the types of nylon and spandex, as well as the selection of the knitting machine and the yarn length, the softness and stretching opening of the double-sided knitted fabric are effectively improved, so that the fabric has a good cotton-like air permeability effect. In addition, the combination of the above-mentioned nylon and spandex also makes the fabric have good skin-friendly performance and a boned and non-soft and sagging effect. The reasons are as follows: The matte nylon low-elastic yarn is 30D / 51F. Due to the large number of monofilaments, the cross-section of the yarn is more fluffy, forming a micro-void structure, thus endowing the fabric with a dry and breathable and cotton-like tactile sensation. And because the monofilament is extremely fine, the fiber stiffness is greatly reduced, achieving an ultra-soft skin-friendly effect. Moreover, the low-elastic yarn nylon has moderate crimp elasticity, which can not only provide elastic support (prevent soft sagging), but also avoid the tight feeling of high-elastic yarn; when choosing 20D spandex, due to the extremely strong elasticity of spandex, it provides a large stretching opening for the fabric. Therefore, when using 20D spandex from Korea Hyosung and the Orsheni series matte nylon low-elastic yarn 30D / 51F from Yili Nylon Technology together, they complement each other in performance. After knitting, nylon serves as the main fiber to provide structural support, and spandex serves as the elastic fiber to enhance the extensibility of the fabric, so that a double-sided knitted fabric with a large stretching opening, super softness, good skin-friendliness, dry and cotton-like air permeability, and a boned and non-soft and sagging effect can be obtained.

[0007] The knitted fabric obtained by simultaneously matching the nylon yarn length within the range of 22.5 - 26.5 cm / 100 needles and the spandex yarn length within the range of 6.5 - 7.5 cm / 100 needles with a high-precision German Mayer weft knitting double-sided large circular knitting machine can simultaneously take into account the high applicability in both sports and leisure scenarios, that is, the fabric is soft and skin-friendly, with a cotton-like comfort, and a good body feeling can also be felt in the leisure scenario. And the large stretching opening and excellent resilience of the fabric can meet the body feeling requirements in the sports scenario; in addition, when choosing a German Mayer weft knitting double-sided large circular knitting machine to knit the grey fabric, the whole fabric is repeatedly looped and knitted by 2 knitting systems. After the finished product, the surface coils of the fabric float up, significantly enhancing the cotton-like feeling and tactile comfort of the fabric, and also enhancing the air permeability of the whole fabric. And the bottom coils of the fabric are also fluffy but relatively flat, meeting the skin-friendly requirements and air permeability requirements at the same time.

[0008] In addition, the inventor found through experiments that when the length of nylon yarn and spandex yarn are respectively less than 22.5 cm / 100 needles and 6.5 cm / 100 needles, the greige fabric obtained by knitting with a German Mayer weft knitting double-sided large circular knitting machine is relatively tight, has poor air permeability, the fabric feels stiff and rigid, lacks a fluffy cotton feeling, has a small stretching opening, and both comfort and applicability are poor. When the yarn lengths of nylon and spandex are respectively greater than 26.5 cm / 100 needles and 7.5 cm / 100 needles, the fabric surface and fabric bottom texture of the greige fabric obtained by knitting with a German Mayer weft knitting double-sided large circular knitting machine are relatively messy. The finished fabric has very good air permeability, but the whole fabric is too loose and has no texture, is very soft and saggy, and is too thin and transparent after being stretched, which is not suitable for making sports T-shirts or vest fabrics. Therefore, when the nylon yarn length is in the range of 22.5 - 26.5 cm / 100 needles and the spandex yarn length is in the range of 6.5 - 7.5 cm / 100 needles, it can effectively ensure the performance of the fabric such as a large stretching opening, air permeability, and having texture without being soft and saggy.

[0009] The inventor also found through experiments that the selection of the weft knitting double-sided large circular knitting machine also has a very significant impact on the performance of the fabric. For example, when using a 32-needle 34-inch Wild Horse weft knitting double-sided large circular knitting machine from Taiwan, China to knit the greige fabric, the obtained finished fabric has poor yarn evenness, poor fabric texture feeling, poor skin-fitting property of the fabric bottom, and the overall texture of the fabric is not high. When using a 32-needle 34-inch Fukuhara weft knitting double-sided large circular knitting machine from Japan to knit the greige fabric, the obtained finished fabric has poor yarn evenness, poor fabric texture feeling and a high frequency of needle marks, and the fabric quality is relatively poor. Therefore, choosing a German Mayer weft knitting double-sided large circular knitting machine is more conducive to the finished fabric having the performance of a large stretching opening, being super soft, having good skin-fitting property, being dry and breathable with a cotton feeling, and having texture without being soft and saggy.

[0010] Preferably, the degreasing agent in step S3 is HUMECTOL LYS, the dosage is 2.5 - 3.0 g / L, the degreasing temperature is 70 - 90 °C, and the speed of the degreasing machine is 15 - 30 m / min.

[0011] Preferably, the speed of the setting machine in step S3 is 15 - 30 m / min, the drying temperature is 128 - 132 °C, and the drying time is 23 - 26 s.

[0012] Preferably, the auxiliary agent used for setting the embryo in step S4 is Figrep TAY-R new, the dosage is 28 - 30 g / L.

[0013] Preferably, the drying conditions in step S6 are 128 - 132 °C, and the drying time is 13 - 18 s.

[0014] Preferably, the formulation of the after-finishing liquid in step S8 is 9-11 g / L of heat-reactive polyurethane resin, 8-12 g / L of hydrophilic silicone oil, and 0.2-0.3 g / L of pH regulator. The heat-reactive polyurethane resin is purchased from Archroma Chemicals (China) Co., Ltd., with the model Hydroperm RPU liquid; the hydrophilic silicone oil is purchased from Zhongshan Baiao Trade Co., Ltd., with the model SOFTENER L606.

[0015] Preferably, the pH regulator is DL-hydroxybutanedioic acid.

[0016] By adopting the above technical solution, when the above after-finishing liquid is used to finish the fabric, the washability and moisture absorption and sweat discharge performance of the fabric can be significantly improved. The reason may be that the heat-reactive polyurethane resin and hydrophilic silicone oil react with the active groups on the fabric fibers to form chemical bond binding. This bonding effect can significantly enhance the elasticity, abrasion resistance and dimensional stability of the fabric, and improve the durability of the fabric; and the heat-reactive polyurethane resin forms a hydrophilic film on the surface of the fabric. This film has good moisture permeability and moisture transfer ability, and the introduction of hydrophilic silicone oil can increase the contact area between the fabric and sweat, improve the moisture absorption speed. Further, the DL-hydroxybutanedioic acid reacts with the fabric fibers to undergo an esterification reaction to obtain hydrophilic ester bonds. These ester bonds can absorb and fix water molecules, further enhancing the moisture absorption and sweat discharge performance of the fabric. Therefore, after finishing the fabric with the above after-finishing liquid formulation, not only the water resistance and wear resistance of the fabric can be improved, but also the moisture absorption and sweat discharge performance of the fabric can be improved.

[0017] The second aspect of the present application is to provide a double-sided knitted fabric obtained by the above preparation method.

[0018] In summary, the present application has the following beneficial effects: 1. The fabric obtained in the present application has a soft and fluffy hand feeling, a strong cotton feeling, good skin-friendly performance, and is comfortable to wear.

[0019] 2. The fabric has a large stretching opening and good recovery performance, strong wrapping and supporting properties, and can highlight a good figure.

[0020] 3. The fabric is soft and skin-friendly, with a comfortable cotton feeling, and can enjoy a good body feeling in a casual scene. At the same time, the large stretching opening and excellent recovery force can meet the body feeling requirements in a sports scene, and the combination of nylon and spandex improves the abrasion resistance of the fabric. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the knitting structure of the yarn in the embodiment of the present application.

[0022] Figure 2This is an enlarged view of the surface and base of the finished double-sided fabric of the embodiment of the present application under an optical microscope.

[0023] Figure 3 This is a physical picture of the fabric surface and fabric base of the finished double-sided fabric of the embodiment of the present application.

[0024] Figure 4 This is an enlarged view of the fabric surface of the finished fabric of Comparative Example 3 of the present application under an optical microscope. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings. All reagents without manufacturer indicated are conventional reagent products that can be purchased commercially.

[0026] Example 1 A method for preparing a double-sided knitted fabric with ultra-large opening, soft and close-fitting to the skin, comprising the following steps: S1. Yarn preparation: Orsheni series matte nylon 66 low-elastic yarn of Yili Nylon Technology is used, with specifications of 30D / 51F. The spandex uses 20D dyeable spandex H350A from Korea Hyosung. In the fabric design, nylon accounts for 84% and spandex accounts for 16%; S2. Weaving grey fabric: Design a weft knitted double-sided knitted structure. The nylon yarn length is 24.5cm / 100 needles and the spandex yarn length is 7cm / 100 needles. Use a 32-needle 34-inch German Meyer weft knitted double-sided circular machine to repeatedly knit the grey fabric. The weft knitted double-sided circular machine has a knitting speed of 15r / min. The entire fabric is repeatedly woven by a 2-way knitting system. The overall knitting structure is as follows: Figure 1 As shown in the figure, the surface coils of the finished fabric float, and the bottom coils are fluffy but relatively flat. The finished double-sided fabric is as follows Figure 2 and Figure 3 shown, and Figure 2 and Figure 3 The left side in the middle is all cloth top, and the right side is all cloth bottom; S3, degreasing and drying of the grey cloth, using a Goller open width degreasing machine to degreasing the grey cloth, the degreasing agent used is HUMECTOL LYS of Anchor Chemicals (China) Co., Ltd., the dosage is 3.0g / L, water, the degreasing temperature is 80°C, the degreasing machine speed is 25m / min, the grey cloth is put on the setting machine needle chain after leaving the degreasing machine, and then put into the setting machine oven for drying, the setting machine speed is 20m / min, the drying temperature is 130°C, and the drying time is 25s; S4, pre-forming of the grey cloth, using a setting machine to pre-form the grey cloth obtained in step S3, the setting temperature is 198°C, the time is 15s, and the auxiliary agent used for setting is Figrep TAY-R new, used at 30 g / L, water, purchased from Vigor Textile Auxiliary (Jiangmen) Co., Ltd.; S5. After the grey cloth is dyed, it is subjected to a color fixing treatment, the dyeing temperature is 105°C, the time is 40 minutes; the color fixing condition is 75°C, the time is 20 minutes, and the color fixing condition is two consecutive color fixings; S6, loosening and drying, using a water press to press water and loosen the rope-shaped fabric out of the cylinder, and then drying it in a setting machine, the drying condition is 130°C, and the drying time is 15s; S7, sanding; S8. Double-sided knitted fabric was obtained by finishing the fabric. The finishing liquid formula was 10 g / L of heat-reactive polyurethane resin (purchased from Archroma Chemicals (China) Co., Ltd., model number Hydroperm RPU liquid), 10 g / L of hydrophilic silicone oil (Zhongshan Biotec Trading Co., Ltd., model number SOFTENER L606), 0.3 g / L of DL-hydroxysuccinic acid (Fujian Jinjiang Xindemei Chemical Co., Ltd.), and water.

[0027] Example 2 A method for preparing a double-sided knitted fabric with ultra-large opening, soft and close-fitting to the skin, comprising the following steps: S1. Yarn preparation: Orsheni series matte nylon 66 low-elastic yarn of Yili Nylon Technology is used, with specifications of 30D / 51F. The spandex uses 20D dyeable spandex H350A from Korea Hyosung. In the fabric design, nylon accounts for 84% and spandex accounts for 16%; S2. Weaving grey fabric: Design a weft knitted double-sided knitted structure. The nylon yarn length is 22.5cm / 100 needles and the spandex yarn length is 6.5cm / 100 needles. Use a 32-needle 34-inch German Meyer weft knitted double-sided circular machine to repeatedly knit the grey fabric. The weft knitted double-sided circular machine has a knitting speed of 10r / min. The entire fabric is repeatedly woven by a 2-way knitting system. The overall knitting structure is as follows: Figure 1 As shown in the figure, the surface coils of the finished fabric float, and the bottom coils are fluffy but relatively flat. The finished double-sided fabric is as follows Figure 2 and Figure 3 As shown; S3, degreasing and drying of the grey cloth, using a Goller open width degreasing machine to degreasing the grey cloth, the degreasing agent used is HUMECTOL LYS of Anchor Chemicals (China) Co., Ltd., the dosage is 2.5g / L, water, the degreasing temperature is 70°C, the degreasing machine speed is 15m / min, the grey cloth is put on the setting machine needle chain after leaving the degreasing machine, and then put into the setting machine oven for drying, the setting machine speed is 15m / min, the drying temperature is 128°C, and the drying time is 23s; S4, pre-forming of the grey cloth, using a setting machine to pre-form the grey cloth obtained in step S3, the setting temperature is 196°C, the time is 12s, and the auxiliary agent used for setting is Figrep TAY-R new, dosage 28 g / L, water, purchased from Vigor Textile Auxiliary (Jiangmen) Co., Ltd.; S5. After the grey cloth is dyed, it is subjected to a color fixing treatment, the dyeing temperature is 103°C, the time is 38 minutes; the color fixing condition is 70°C, the time is 18 minutes, and the color fixing condition is two consecutive color fixings; S6, loosening and drying, using a water press to press water and loosen the rope-shaped fabric out of the cylinder, and then drying it in a setting machine, the drying condition is 128°C, and the drying time is 13s; S7, sanding; S8. Double-sided knitted fabric was obtained by finishing the fabric. The finishing liquid formula was 9 g / L of heat-reactive polyurethane resin (purchased from Archroma Chemicals (China) Co., Ltd., model number Hydroperm RPU liquid), 8 g / L of hydrophilic silicone oil (Zhongshan Biooge Trading Co., Ltd., model number SOFTENER L606), 0.2 g / L of DL-hydroxysuccinic acid (Fujian Jinjiang Xindemei Chemical Co., Ltd.), and water.

[0028] Example 3 A method for preparing a double-sided knitted fabric with ultra-large opening, soft and close-fitting to the skin, comprising the following steps: S1. Yarn preparation: Orsheni series matte nylon 66 low-elastic yarn of Yili Nylon Technology is used, with specifications of 30D / 51F. The spandex uses 20D dyeable spandex H350A from Korea Hyosung. In the fabric design, nylon accounts for 84% and spandex accounts for 16%; S2. Weaving grey fabric: Design a weft knitted double-sided knitted structure. The nylon yarn length is 26.5cm / 100 needles and the spandex yarn length is 7.5cm / 100 needles. Use a 32-needle 34-inch German Meyer weft knitted double-sided circular machine to repeatedly knit the grey fabric. The weft knitted double-sided circular machine has a knitting speed of 20r / min. The entire fabric is repeatedly woven by a 2-way knitting system. The overall knitting structure is as follows: Figure 1 As shown in the figure, the surface coils of the finished fabric float, and the bottom coils are fluffy but relatively flat. The finished double-sided fabric is as follows Figure 2 and Figure 3 As shown; S3, degreasing and drying of the grey cloth, using a Goller open width degreasing machine to degreasing the grey cloth, the degreasing agent used is HUMECTOL LYS of Anchor Chemicals (China) Co., Ltd., the dosage is 3.0g / L, water, the degreasing temperature is 90°C, the degreasing machine speed is 30m / min, the grey cloth is put on the setting machine needle chain after leaving the degreasing machine, and then put into the setting machine oven for drying, the setting machine speed is 30m / min, the drying temperature is 132°C, and the drying time is 26s; S4. Pre - setting the greige fabric. Use a stenter to pre - set the greige fabric obtained in step S3. The pre - setting temperature is 200 °C, the time is 17 s, and the auxiliary agent used for pre - setting is Figrep TAY - R new, with a dosage of 30 g / L of water, purchased from Weigesi Textile Auxiliaries (Jiangmen) Co., Ltd.; S5. After dyeing the greige fabric, carry out a color - fixing treatment. The dyeing temperature is 107 °C and the time is 42 min; the color - fixing conditions are 75 °C and the time is 20 min, and the color - fixing is carried out continuously twice; S6. Relaxing and drying the fabric. Use a water - squeezing machine to squeeze water and relax and open - width the rope - shaped fabric out of the cylinder, and then send it to a stenter for drying. The drying conditions are 132 °C and the drying time is 18 s; S7. Singeing; S8. After - finishing and setting the fabric to obtain a double - sided knitted fabric. The formula of the after - finishing liquid is 11 g / L of heat - reactive polyurethane resin (purchased from Archroma Chemicals (China) Co., Ltd., model: Hydroperm RPU liquid), 12 g / L of hydrophilic silicone oil (Zhongshan Baiao Trade Co., Ltd., model: SOFTENER L606), 0.3 g / L of DL - hydroxybutanedioic acid (Fujian Jinjiang Xindemei Chemical Co., Ltd.), and water.

[0029] Comparative Example 1 A method for preparing a double - sided knitted fabric with extra - large opening and soft skin - friendly property, which is different from Example 1 in that the polyamide fiber uses 30D / 51F matte polyamide 6 low - elastic yarn produced by Zhejiang Jiahua, and the others are the same as in Example 1.

[0030] Comparative Example 2 A method for preparing a double - sided knitted fabric with extra - large opening and soft skin - friendly property, which is different from Example 1 in that the polyamide fiber uses 30D / 36F matte polyester low - elastic yarn produced by Hengli Group, and the others are the same as in Example 1.

[0031] Comparative Example 3 A method for preparing a double - sided knitted fabric with extra - large opening and soft skin - friendly property, which is different from Example 1 in that the polyamide yarn length is 20 cm / 100 needles and the spandex yarn length is 5.7 cm / 100 needles. Use a 40 - needle 34 - inch German Mayer weft - knitted double - sided large - diameter circular knitting machine to knit the greige fabric, and the others are the same as in Example 1. The enlarged view of the finished fabric under an optical microscope is as Figure 4 shown. The fabric is relatively tight and has poor air permeability.

[0032] Comparative Example 4 A method for preparing a double - sided knitted fabric with extra - large opening and soft skin - friendly property, which is different from Example 1 in that the polyamide yarn length is 28 cm / 100 needles and the spandex yarn length is 8 cm / 100 needles, and the others are the same as in Example 1.

[0033] Comparative Example 5 A method for preparing a double-sided knitted fabric with super-large opening and soft skin-friendly property, which is different from Example 1 in that the base fabric is knitted by a 32-needle 34-inch Wild Horse weft knitting double-sided large circular knitting machine from Taiwan Province, China, and the others are the same as in Example 1.

[0034] Comparative Example 6 A method for preparing a double-sided knitted fabric with super-large opening and soft skin-friendly property, which is different from Example 1 in that the base fabric is knitted by a 32-needle 34-inch Fukuhara weft knitting double-sided large circular knitting machine from Japan, and the others are the same as in Example 1.

[0035] Performance testing The double-sided knitted fabrics obtained from the above examples and comparative examples were tested for tensile performance, air permeability, moisture permeability, softness, fluffiness and stability, and the test results are shown in Tables 1 and 2.

[0036] Among them, the elongation rate was measured by Method A in BS EN ISO14704-1:2005, which is the elongation rate under a force of 25 N, and the residual elongation rate was measured by the residual elongation rate after 1 min of tensile test by Method A in BS EN ISO14704-1:2005.

[0037] The air permeability was carried out according to the relevant regulations in GB / T5453-1997 "Determination of air permeability of textiles fabrics", and the air flow rate passing vertically through a given area of the specimen within a certain time was measured.

[0038] The moisture permeability rate was carried out according to the relevant regulations in GB / T12704.2-2009 "Textiles Test methods for moisture permeability of fabrics Part 2 Evaporation method".

[0039] The fluffiness performance was tested by a FAST-1 compression instrument to measure the thickness and compression performance of the fabric, which was expressed by the surface compressibility rate. The principle is that under two different loads of 2 gf / cm 2 (196 Pa) and 100 gf / cm 2 (9.81 kPa), the relaxed surface thickness and the absolute surface thickness of the fabric were calculated, and the compressibility performance of the fabric was calculated from the difference between the two thicknesses. The formula is as follows: ST = T2 - T100, where ST is the surface thickness of the fabric, T2 is the thickness of the fabric under the condition of 2 gf / cm 2 (relaxed surface thickness), and T100 is the thickness of the fabric under the condition of 100 gf / cm 2 (absolute surface thickness).

[0040] Flexibility is tested using a FAST-2 bending instrument and expressed as bending stiffness. The FAST-2 bending instrument is an instrument that uses the cantilever beam method to test the bending rigidity of fabrics according to the British standard BS.3356-1961 (or the standard L-3084 in Taiwan, China, ASTM D-1388). The fabric bending stiffness is calculated using the bending length and the weight per unit area of the fabric. The formability can be calculated by combining the bending stiffness with the extensibility measured by FAST-3. It is related to the quality of the fabric sewing performance. The overall performance is not only crucial for aesthetics such as drapability and handfeel, but also has a significant impact on clothing production. Its main indicator is the bending stiffness, and the formula is as follows: B = W × C 3 × 9.807 × 10 ﹣6 , where B is the bending stiffness (μN·m), W is the weight per unit of the fabric (g / m 2 ), and C is the bending length (mm).

[0041] The fabric stability is tested by the shrinkage rate after washing the fabric, and the test is carried out according to the relevant regulations in ISO6330-2012.

[0042] Table 1 Tensile test results of double-sided knitted fabric It can be seen from Table 1 that the double-sided knitted fabrics obtained in Examples 1-3 of this application have an extremely large tensile opening and good elasticity.

[0043] The differences between Comparative Examples 1-2 and Example 1 are that when the nylon yarn is selected as the 30D / 51F matte nylon 6 low-elastic yarn produced by Zhejiang Jiahua and the 30D / 36F matte polyester low-elastic yarn produced by Hengli Group, the tensile properties of the double-sided knitted fabrics obtained in Comparative Examples 1-2 decrease, and the residual elongation rate increases, indicating that the elastic recovery performance of the fabrics obtained in Comparative Examples 1-2 decreases. It can be seen that when the Orsheni series matte nylon 66 low-elastic yarn of Yili Nylon Technology is selected in this application, the tensile opening and elasticity of the fabric can be effectively improved.

[0044] Compared with Example 1, in Comparative Examples 3-6, when the yarn length exceeds the limit of this application, the tensile properties and elasticity of the double-sided knitted fabrics obtained in Comparative Examples 3-4 both decrease; when the weft knitting double-sided circular knitting machine is used to weave fabrics with Yema in Taiwan, China or Fukuhara in Japan, the tensile properties and elasticity of the fabrics obtained in Comparative Examples 5-6 also both decrease. It can be seen that the length of the yarn and the choice of the knitting machine have significant effects on the tensile properties and elasticity of the fabric.

[0045] Table 2 Detection results of air permeability, moisture permeability, softness and fluffiness of double-sided knitted fabric The smaller the bending stiffness, the softer the fabric. The larger the surface compressibility, the better the fluffiness of the fabric.

[0046] As can be seen from Table 2, the fabrics obtained in Examples 1-3 of this application have good fluffiness and softness.

[0047] Compared with Example 1, in Comparative Examples 1-2, the air permeability and moisture permeability of the fabrics obtained in Comparative Examples 1-2 are relatively poor, and their surface compressibilities are lower than those in Example 1, indicating that the fluffiness of the fabrics obtained in Comparative Examples 1-2 is relatively poor. The bending stiffness of the fabric obtained in Comparative Example 1 is greater than the complete stiffness in Example 1 of this application, indicating that the fabric obtained in Comparative Example 1 is harder and has relatively poor softness. While the bending stiffness in Comparative Example 2 is much smaller than that in Example 1, and the fabric is too soft, resulting in a lack of structure and affecting the texture of the fabric.

[0048] Compared with Example 1, in Comparative Examples 3-4, the fluffiness of their fabrics is worse than that in Example 1. And the fabric obtained in Comparative Example 3 is too hard. Although the air permeability of the fabric obtained in Comparative Example 4 is better than that of the fabric obtained in Example 1, due to the fact that the fabric obtained in Comparative Example 4 is too soft, it leads to a lack of structure and is not suitable for making sports T-shirts or vest fabrics.

[0049] Compared with Example 1, in Comparative Examples 5-6, after using two weft knitting double-sided large diameter circular knitting machines from Yema in Taiwan Province of China and Fukuhara in Japan, the air permeability, moisture permeability, fluffiness and softness of the fabrics obtained in Comparative Examples 5-6 are all worse than those in Example 1. It can be seen that the selection of the weft knitting double-sided large diameter circular knitting machine also has a very significant impact on the fabric performance.

[0050] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A method for preparing a double-sided knitted fabric with ultra-large opening, soft and close to the skin, characterized in that: The steps include: S1. Yarn preparation; the fabric includes 84% ​​nylon and 16% spandex by weight. The nylon is Orsheni series matte nylon 66 low-elastic yarn from Yili Nylon Technology, and the spandex is 20D dyeable spandex H350A from Korea Hyosung. S2, weaving grey cloth: nylon yarn length is 22.5-26.5cm / 100 needles, spandex yarn length is 6.5-7.5cm / 100 needles, and the grey cloth fabric is obtained by repeated weaving with a 32-needle 34-inch weft knitting double-sided circular machine; S3, degreasing and drying the grey cloth, degreasing the grey cloth, shaping and drying it; S4, the grey cloth is pre-embroided, the temperature of the embryo is 196-200℃, and the time is 12-17s; S5. After the grey cloth is dyed, it is subjected to a color fixing treatment at a dyeing temperature of 103-107°C for 38-42 minutes; the color fixing condition is 70-75°C for 18-20 minutes; S6, loosen the cloth and dry it; S7, sanding; S8. The fabric is post-processed and shaped to obtain a double-sided knitted fabric.

2. The method for preparing a double-sided knitted fabric with ultra-large opening and soft skin-friendly according to claim 1, characterized in that: The weft knitting double-sided circular machine adopts the German Meyer weft knitting double-sided circular machine with a rotation speed of 10-20r / min.

3. The method for preparing a double-sided knitted fabric with ultra-large opening and soft skin-friendly according to claim 1, characterized in that: The degreasing agent in step S3 is HUMECTOL LYS, the dosage is 2.5-3.0 g / L, the degreasing temperature is 70-90° C., and the degreasing machine speed is 15-30 m / min.

4. The method for preparing a double-sided knitted fabric with ultra-large opening and soft skin-friendly according to claim 1, characterized in that: The speed of the setting machine in step S3 is 15-30 m / min, the drying temperature is 128-132° C., and the drying time is 23-26 s.

5. The method for preparing a double-sided knitted fabric with ultra-large opening and soft skin-friendly according to claim 1, characterized in that: The auxiliary agent used for embryo fixation in step S4 is Figrep® TAY-R new, and the dosage is 28-30 g / L.

6. The method for preparing a double-sided knitted fabric with ultra-large opening and soft skin-friendly according to claim 1, characterized in that: The drying condition in step S6 is 128-132° C., and the drying time is 13-18 seconds.

7. The method for preparing a double-sided knitted fabric with ultra-large opening and soft skin-friendly according to claim 1, characterized in that: The formula of the finishing liquid in step S8 is 9-11 g / L of heat-reactive polyurethane resin, 8-12 g / L of hydrophilic silicone oil, and 0.2-0.3 g / L of pH adjuster; The heat-reactive polyurethane resin was purchased from Archroma Chemicals (China) Co., Ltd., with the model number HydropermRPU liquid; the hydrophilic silicone oil was purchased from Zhongshan Biooge Trading Co., Ltd., with the model number SOFTENER L606.

8. The method for preparing a double-sided knitted fabric with ultra-large opening and soft skin-friendly properties according to claim 1, characterized in that: The pH regulator is DL-hydroxysuccinic acid.

9. A double-sided knitted fabric obtained by the method for preparing a double-sided knitted fabric with ultra-large opening, soft and close to the skin as described in any one of claims 1 to 8.

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