Double-sided velvet high-elastic fabric and preparation method thereof

Abstract

The present application belongs to the technical field of double-sided plush high-elastic fabric, and provides a double-sided plush high-elastic fabric and a preparation method thereof. The preparation method comprises weaving and dyeing and finishing in sequence. The weaving is performed by using an RD2N double-comb double-needle bed warp knitting machine, which comprises a GB1 comb and a GB2 comb and is free of an intermediate connecting comb. The double-needle bed independently forms loops in sequence, and the woven fabric is free of a sandwich connecting structure and only relies on the yarns of the GB1 comb and the GB2 comb for connecting by alternately laying-in the front and rear needle beds. The GB1 comb is used for weaving by using a change warp plain plush weave, and the GB2 comb is used for weaving by using a two-needle warp satin weave. The present application is woven by using the RD2N double-comb double-needle bed warp knitting machine free of the intermediate connecting comb, the whole machine is only provided with two working combs, the double-layer fabric is interlocked and integrally formed, a double-layer integrated double-sided elastic plush surface structure is constructed, the fabric sandwich gap is completely eliminated, and the cloth surface is ensured to be flat and dense. The double-comb differential loop-forming weave structure is collaboratively designed, the division of labor is clear, and the performance is complementary.

Description

Technical Field

[0001] This invention relates to the field of double-sided fleece high-elastic fabric technology, and in particular to a double-sided fleece high-elastic fabric and its preparation method. Background Technology

[0002] Existing double-sided fleece stretch fabrics are mainly woven using weft-knitting circular knitting machines, single-needle-bed warp knitting machines, and multi-comb double-needle-bed warp knitting machines with intermediate connecting combs. However, all of these methods have significant technical shortcomings, making it difficult to simultaneously achieve the comprehensive performance requirements of fabric smoothness and lightness, balanced two-way elasticity, strong dimensional stability, good resilience and durability, and a delicate fabric surface. For example, double-sided fleece stretch fabrics produced by traditional weft-knitting circular knitting machines have a loose structure, large loop slippage, and poor dimensional stability. Furthermore, they are prone to deformation, curling, and elasticity loss after washing and setting. The fabric's stretch uniformity and appearance smoothness are insufficient to meet the requirements of high-end intimate apparel and functional textiles. On the other hand, stretch fabrics produced by conventional single-needle-bed warp knitting machines are mainly elastic in the warp direction, with low weft elongation and insufficient elasticity. The fabric has poor multi-directional fit, resulting in a noticeable feeling of restriction when worn and failing to adapt to the multi-dimensional stretching needs of the human body. Multi-comb double needle bed warp knitting machines are equipped with a middle connecting comb, which connects the upper and lower layers of fabric by means of the middle extension yarn. The fabrics woven by this type of machine generally have defects such as large gaps between layers, thick fabric, high weight, and poor fabric smoothness. It is only suitable for weaving interlayer cushioning fabrics and cannot produce dense, thin, and smooth double-sided fleece elastic fabrics, which severely limits the applicable scenarios of the fabrics.

[0003] In summary, the lack of existing technologies for large-scale weaving processes that can simultaneously achieve a flat and dense fabric surface, light thickness, balanced warp and weft elasticity, excellent dimensional stability, and fine and uniform pile surface in double-sided fleece elastic fabrics severely restricts the industrial application of high-end close-fitting functional fabrics. Summary of the Invention

[0004] The purpose of this invention is to provide a double-sided fleece high-elastic fabric and its preparation method, aiming to solve the defects of traditional double-sided fleece elastic fabrics such as loose structure, poor dimensional stability, uneven bidirectional elasticity, thick fabric, rough fleece surface, and easy deformation after washing, so as to achieve stable mass production of lightweight, flat, highly elastic, and highly dimensionally stable double-sided fleece elastic fabrics.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for preparing a double-sided fleece high-elastic fabric, comprising sequential weaving and dyeing / finishing. The weaving process uses an RD2N double-comb double-needle bed warp knitting machine, which includes GB1 comb and GB2 comb, without intermediate connecting comb; the double needle beds form loops independently, and the woven fabric has no interlayer connecting structure, relying solely on the yarns of GB1 comb and GB2 comb to alternately pad the yarns on the front and rear needle beds for connection. The GB1 comb is woven using a variable warp velvet weave, while the GB2 comb is woven using a two-needle warp satin weave.

[0006] Preferably, the padding yarn structure of the GB1 comb is 12, 34, 32, 10 / / , and the yarn threading method is full threading.

[0007] Preferably, the padding yarn structure of the GB2 comb is 10, 12, 23, 21 / / , and the yarn threading method is full threading.

[0008] Preferably, the yarn-threading component of the GB1 comb is 30~70D spandex filament, and the yarn-threading component of the GB2 comb is 10~30D nylon DTY yarn.

[0009] Preferably, the number of single filaments of the 10~30D nylon DTY yarn is 12~96F.

[0010] Preferably, the dyeing and finishing process includes sequential processes of flat-width washing, pre-setting, dyeing, and final setting.

[0011] Preferably, the predetermined type includes a low-temperature predetermined type and a high-temperature predetermined type performed sequentially.

[0012] Preferably, the temperature of the low-temperature pre-conditioning is 135~145℃, and the low-temperature pre-conditioning time is 30~50s; The temperature for the high-temperature pre-conditioning is 195~205℃, and the high-temperature pre-conditioning time is 40~60s.

[0013] The present invention also provides a double-sided fleece high-elastic fabric prepared by the aforementioned preparation method.

[0014] The beneficial effects of this invention are: This invention employs the RD2N double-comb double-needle bed warp knitting machine without intermediate connecting combs for weaving. The entire machine is equipped with only two working combs, eliminating the intermediate connecting comb structure of traditional double-needle bed machines. This achieves interlocking and integrated molding of double-layer fabrics, constructing a double-layer, integrated, and layer-free double-sided elastic pile structure, completely eliminating fabric gaps, and ensuring a smooth and dense fabric surface. From the equipment structure level, it solves the problems of traditional multi-comb double-needle bed fabrics being thick, having poor smoothness, and being unable to weave lightweight and close-fitting fabrics. The differentiated loop-forming structure of the double combs is designed collaboratively, with clear division of labor and complementary performance. The variation of GB1 comb through the velvet weave is responsible for constructing a two-way elastic network and structural stability, ensuring the overall structural stability and two-way balanced elasticity of the fabric; GB2 comb... The two-needle warp satin weave controls the fabric thickness and nap fineness, achieving a lightweight fabric. The differentiated padding yarn movement combination of GB1 comb long span elastic variation warp velvet weave and GB2 short span two-needle warp satin weave, with the two sets of padding yarn movement cycles matched and loop phases coordinated, breaks through the technical bottleneck of traditional double-sided fleece fabrics being unable to simultaneously achieve stability, high elasticity, and lightweight. The two combs respectively use a differentiated raw material yarn combination of 30~70D spandex filament and 10~30D nylon DTY yarn, giving the fabric both high-ratio double-sided elasticity and excellent anti-sag and washability. After multiple washes, the elasticity decreases little, the dimensional deformation rate is low, and the dimensional stability and resilience durability are significantly better than traditional weft-knitted and ordinary warp-knitted double-sided fleece fabrics.

[0015] The preparation method of this invention has controllable process parameters, strong weaving stability, and high product consistency. The resulting double-sided fleece high-elastic fabric is delicate and uniform, soft to the touch, and has balanced elasticity in both warp and weft directions. It is suitable for multi-directional stretching and fitting needs of the human body in various scenarios and can be widely used in high-end functional textile fields such as high-end seamless underwear, functional sports compression fabrics, medical elastic substrates, and fine home textiles. It has broad prospects for industrialization and promotion. Attached Figure Description

[0016] Figure 1 This is a diagram showing the movement of the comb-and-pad yarn structure according to GB1 standards. Figure 2 This is a diagram of the movement of the comb and pad yarn structure according to GB2. Detailed Implementation

[0017] This invention provides a method for preparing a double-sided fleece high-elastic fabric, comprising sequential weaving and dyeing / finishing. The weaving process uses an RD2N double-comb double-needle bed warp knitting machine, which includes GB1 comb and GB2 comb, without intermediate connecting comb; the double needle beds form loops independently, and the woven fabric has no interlayer connecting structure, relying solely on the yarns of GB1 comb and GB2 comb to alternately pad the yarns on the front and rear needle beds for connection. The GB1 comb is preferably woven using a variable warp velvet weave, and the GB2 comb is preferably woven using a two-needle warp satin weave.

[0018] In this invention, the RD2N double-comb double-needle bed warp knitting machine has no intermediate connecting comb. The double-layer fabric woven by the double needle bed is interlocked with each other and has no interlayer connecting structure, ensuring that the fabric is dense and flat as a whole without gaps or defects.

[0019] In this invention, the preferred weft yarn structure of the GB1 comb is 12, 34, 32, 10 / / , and the preferred yarn threading method is full threading. This weft yarn structure has dense interlacing points and strong loop constraint structure stability, which can effectively suppress loop slippage and fabric deformation during weaving and dyeing processes.

[0020] In this invention, the GB1 comb is an elastic loop comb, and its digital yarn circulation preferably includes the following four modes: ① 1-2, 3-4, 3-2, 1-0 / / , ② 3-4, 3-2, 1-0, 1-2 / / , ③ 3-2, 1-0, 1-2, 3-4 / / , ④ 1-0, 1-2, 3-4, 3-2 / / ; Taking ①1-2, 3-4, 3-2, 1-0 / / as an example, specifically: A four-step cyclic yarn padding pattern is adopted. A complete cyclic structure includes four forward lateral shifts and four backward lateral shifts, namely: GB1 begins with forward yarn padding between the 1st and 2nd needles of the front needle bed to form a loop. Then, a backward lateral shift is performed from front to back between the 2nd needle of the front needle bed and the 3rd needle of the back needle bed, forming a cross-layer extension line; next, forward yarn padding is performed between the 3rd and 4th needles of the back needle bed to form a loop, followed by... The fourth stitch, positioned between the third stitch of the front needle bed, is moved laterally from back to front, forming a cross-layer extension line. Next, a loop is formed between the third and second stitches of the front needle bed. Then, a loop is formed between the second stitch of the front needle bed and the first stitch of the rear needle bed, moving laterally from front to back, forming another cross-layer extension line. Finally, a loop is formed between the first and zero stitches of the rear needle bed, and then a loop is formed between the zero stitch of the rear needle bed and the first stitch of the front needle bed, moving laterally from back to front, forming yet another cross-layer extension line. This cycle of alternating loops between the front and rear needle beds, numerous cross-needle extension segments, and tight loop weaving, with the raw material yarn (spandex) participating throughout the warp and weft loop formation of the double-layer fabric, ensures ample lateral extension and stable longitudinal loop locking. This is the core reason for achieving bidirectional balanced elasticity and high structural stability, effectively suppressing loop slippage and avoiding the defects of uneven elasticity and unstable fabric surface in traditional single-sided warp plain weaves.

[0021] In this invention, the preferred yarn weave structure of the GB2 comb is 10, 12, 23, 21 / / , and the preferred yarn threading method is full threading. This yarn weave structure has the core characteristic of short interlayer extension lines, which can maximize the compression of the overall fabric thickness and achieve a lighter and thinner fabric.

[0022] In this invention, the GB2 comb is a thin-base shaping comb, and its digital yarn circulation preferably includes the following four modes: ① 1-0, 1-2, 2-3, 2-1 / / , ② 1-2, 2-3, 2-1, 1-0 / / , ③ 2-3, 2-1, 1-0, 1-2 / / , ④ 2-1, 1-0, 1-2, 2-3 / / ; Taking ①1-0, 1-2, 2-3, 2-1 / / as an example, the specific method is as follows: a four-step cyclic yarn padding pattern is adopted: A complete cycle consists of four forward and four backward lateral movements, namely: GB2 begins with a forward yarn padding loop formed between the 1st and 0th needles of the front needle bed, followed by a backward lateral movement between the 0th needle of the front needle bed and the 1st needle of the rear needle bed, forming a cross-layer extension line; then, a forward yarn padding loop is formed between the 1st and 2nd needles of the rear needle bed, followed by a backward lateral movement between the 2nd needle of the rear needle bed and the 2nd needle of the front needle bed, forming a cross-layer extension line; next, a forward yarn padding loop is formed between the 2nd and 3rd needles of the front needle bed, followed by a backward lateral movement between the 3rd needle of the front needle bed and the 2nd needle of the rear needle bed, forming a cross-layer extension line; finally, a forward yarn padding loop is formed between the 2nd and 1st needles of the rear needle bed, followed by a backward lateral movement between the 1st needle of the rear needle bed and the 1st needle of the front needle bed, forming a cross-layer extension line. The above-mentioned padding yarn structure features extremely short interlayer extension lines, few cross-needle steps, and minimized float length, which greatly reduces the overall thickness of the fabric and achieves a lighter and thinner fabric. The loop arrangement is regular and the fabric surface is highly flat. Combined with fine denier (10~30D) nylon DTY yarn, it forms a delicate double-sided nap, while not destroying the overall double-layer interlocking structure. It perfectly meets the weaving requirements of RD2N without intermediate comb and with a dense and flat surface.

[0023] In this invention, the yarn-threading component of the GB1 comb is preferably 30-70D spandex filament, more preferably 40-60D spandex filament, and even more preferably 50D spandex filament; the yarn-threading component of the GB2 comb is preferably 10-30D nylon DTY yarn, more preferably 15-25D nylon DTY yarn, and even more preferably 20D nylon DTY yarn. The 30-70D spandex filament participates in the loop-forming and lateral extension movements of the front and rear needle beds throughout the entire process, simultaneously constructing a uniform warp and weft bidirectional elastic recovery system, ensuring balanced warp and weft elasticity of the fabric, long-lasting resilience, and resistance to loosening; the 10-30D nylon DTY yarn can form a fine and dense double-sided fleece structure, significantly improving the fabric's smoothness, softness, and drape.

[0024] In this invention, the number of single filaments of the 10-30D nylon DTY yarn is preferably 12-96F, specifically 12F, 16F, 20F, 24F, 28F, 30F, 34F, 36F, 38F, 40F, 42F, 46F, 48F, 50F, 52F, 56F, 58F, 60F, 62F, 64F, 66F, 68F, 70F, 72F, 74F, 76F, 78F, 80F, 82F, 84F, 86F, 88F, 90F, 92F, 94F, and 96F.

[0025] In this invention, the 10~30D nylon DTY yarn preferably includes, but is not limited to, 10~30D nylon 66DTY yarn and 10~30D nylon 6DTY yarn.

[0026] In this invention, the preferred warp feed rate of the GB1 comb is 1450~1650mm / R, specifically 1450mm / R, 1480mm / R, 1500mm / R, 1520mm / R, 1540mm / R, 1550mm / R, 1580mm / R, 1600mm / R, 1620mm / R, and 1650mm / R; The preferred warp feed rate of the GB2 comb is 2100~2500mm / R, and more preferably 2100mm / R, 2150mm / R, 2200mm / R, 2250mm / R, 2300mm / R, 2350mm / R, 2400mm / R, 2450mm / R, or 2500mm / R.

[0027] In this invention, the specific positions of the GB1 comb and GB2 comb in the RD2N double comb double needle bed warp knitting machine are not limited. They can be set as GB1 comb and GB2 comb respectively from front to back, or they can be set as GB1 comb and GB2 comb respectively from back to front.

[0028] In this invention, the dyeing and finishing process preferably includes sequential processes of flat-width washing, pre-setting, dyeing, and final setting.

[0029] In this invention, the temperature of the flat-width water washing is preferably 70~85℃, more preferably 78~82℃, and even more preferably 80℃; the speed of the flat-width water washing is preferably 20~24 m / min, more preferably 21~23 m / min, and even more preferably 22 m / min.

[0030] In this invention, the predetermined type preferably includes a low-temperature predetermined type and a high-temperature predetermined type performed sequentially.

[0031] In this invention, the temperature of the low-temperature pre-conditioning is preferably 135~145℃, more preferably 140℃; the time of the low-temperature pre-conditioning is preferably 30~50s, more preferably 40s. The temperature of the high-temperature pre-conditioning is preferably 195~205℃, more preferably 198~202℃, and even more preferably 200℃; the time of the high-temperature pre-conditioning is preferably 40~60s, and even more preferably 50s.

[0032] In this invention, the final setting temperature is preferably 160~175℃, more preferably 165℃; the final setting time is preferably 40~60s, more preferably 50s.

[0033] The present invention also provides a double-sided fleece high-elastic fabric prepared by the aforementioned preparation method.

[0034] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0035] Example 1

[0036] The raw materials are 10D / 12F nylon 66DTY yarn and 30D spandex filament. The warping tension of the raw materials is 5g for 10D / 12F nylon 66DTY yarn and 1g for 30D spandex filament.

[0037] A 138-inch RD2N double-comb double-needle bed warp knitting machine without intermediate connecting combs is selected. From front to back, it includes GB1 comb and GB2 comb. GB1 comb is woven with a variable warp velvet structure, with a padding yarn pattern of 12, 34, 32, 10 / / and a padding yarn digital cycle of 1-2, 3-4, 3-2, 1-0 / / . GB2 comb is woven with a two-needle warp satin structure, with a padding yarn pattern of 10, 12, 23, 21 / / and a padding yarn digital cycle of 1-0, 1-2, 2-3, 2-1 / / . One set of warped 30D spandex filament yarn is coiled onto GB1 comb and threaded using a full-thread method. One set of warped 10D / 12F nylon 66DTY yarn is coiled onto GB2 comb and threaded using a full-thread method.

[0038] The weaving process parameters are set as follows: machine density 30c / cm, GB1 carding warp feed 1480mm / R, spandex draft ratio 60%; GB2 carding warp feed 2100mm / R. The warp feed of GB2 carding 66DTY nylon yarn is relaxed, making the fabric loop column longer. The floats form loop pile on both sides of the fabric, which can cover the relatively small 30D spandex filament.

[0039] Weaving is performed according to the above parameter settings. The double needle beds form loops independently one after the other. The yarns of the GB1 comb and GB2 comb are alternately padded and connected on the front and rear needle beds to obtain a double-sided fleece high-elastic fabric rough fabric without interlayer connection structure.

[0040] The double-sided fleece high-elastic fabric greige is sequentially subjected to flat-width washing, low-temperature pre-setting, high-temperature pre-setting, dyeing, drying, and final finishing to obtain the finished double-sided fleece high-elastic fabric. The process parameters for each step are as follows: Flat-width washing: The washing temperature is 70℃ and the machine speed is 20 meters / min. This process removes impurities such as spinning oil, spandex oil, and knitting needle oil from the raw fabric and causes the fabric to shrink evenly, releasing the internal stress of the fabric.

[0041] Low-temperature pre-forming: Temperature 135℃, pre-forming for 30 seconds, uniform stretching of the fabric weight, and initial dimensional stabilization.

[0042] High-temperature pre-setting: Temperature 195℃, pre-setting time 40s, stabilizes dimensions, flattens the fabric surface, and prevents further shrinkage during dyeing.

[0043] Dyeing: For flat-width dyeing in a rotary kiln, add 1.0% (mass fraction) leveling agent, 0.5 g / L spandex anti-staining agent, 0.3% (mass fraction) spandex coloring agent, 1.3% (mass fraction) Acid Yellow M-2G dye, 1.2% (mass fraction) Acid Black M-RD dye, 2.1% (mass fraction) Acid Black BF dye, and 0.03% (mass fraction) Disperse Black ETF dye to room temperature water. Heat to 80℃ at a rate of 1℃ / min, then add 1.0 g / L spandex anti-staining agent and maintain the temperature for 1 day. 5 min → Heat to 98℃ at a rate of 1.0℃ / min and dye for 40 min → Cool to 50℃ and drain directly, add 1 g / L soda ash and 1 g / L soaping agent, and soap for 30 minutes, followed by two hot washes, each lasting 15 minutes → Heat to 70℃ at a rate of 1.5℃ / min, add 5% (mass fraction) fixing agent and fix for 30 minutes → Cool to 50℃ and drain directly, add 1 g / L soda ash and 1 g / L soaping agent, and soap for 30 minutes → Hot wash twice, each lasting 15 minutes.

[0044] Drying: Temperature 160℃, dry for 40 seconds, ensuring the fabric surface is flat.

[0045] Final shaping: Temperature 160℃, final shaping for 40 seconds, adjust softness, and further stabilize dimensions.

[0046] Example 2

[0047] The raw materials are 20D / 20F nylon 66DTY yarn and 40D spandex filament. The warping tension of the raw materials is 7g for 20D / 20F nylon 66DTY yarn and 1.6g for 40D spandex filament.

[0048] A 138-inch RD2N double-comb double-needle bed warp knitting machine without intermediate connecting combs is selected. From front to back, it includes GB1 comb and GB2 comb. GB1 comb is woven with a variable warp velvet structure, with a padding yarn pattern of 12, 34, 32, 10 / / and a padding yarn digital cycle of 1-2, 3-4, 3-2, 1-0 / / . GB2 comb is woven with a two-needle warp satin structure, with a padding yarn pattern of 10, 12, 23, 21 / / and a padding yarn digital cycle of 1-0, 1-2, 2-3, 2-1 / / . One set of warped 40D spandex filament yarn is coiled onto GB1 comb and threaded using a full-thread method. One set of warped 20D / 20F nylon 66DTY yarn is coiled onto GB2 comb and threaded using a full-thread method.

[0049] The weaving process parameters are set as follows: machine density 29c / cm, GB1 carding warp feed 1540mm / R, spandex draft ratio 60%; GB2 carding warp feed 2300mm / R. The warp feed of GB2 carding 66DTY nylon yarn is relaxed, making the fabric loop column longer. The floats form loop pile on both sides of the fabric, which can cover the relatively small 40D spandex filament.

[0050] Weaving is performed according to the above parameter settings. The double needle beds form loops independently one after the other. The yarns of the GB1 comb and GB2 comb are alternately padded and connected on the front and rear needle beds to obtain a double-sided fleece high-elastic fabric rough fabric without interlayer connection structure.

[0051] The double-sided fleece high-elastic fabric greige is sequentially subjected to flat-width washing, low-temperature pre-setting, high-temperature pre-setting, dyeing, drying, and final finishing to obtain the finished double-sided fleece high-elastic fabric. The process parameters for each step are as follows: Flat-width washing: The washing temperature is 80℃ and the machine speed is 21 meters / min. This process removes impurities such as spinning oil, spandex oil, and knitting needle oil from the raw fabric and causes the fabric to shrink evenly, releasing the internal stress of the fabric.

[0052] Low-temperature pre-forming: Temperature 140℃, pre-forming for 40 seconds, uniform stretching of the fabric weight, and initial dimensional stabilization.

[0053] High-temperature pre-setting: Temperature 200℃, pre-setting for 50 seconds, stabilizes dimensions, flattens the fabric surface, and prevents further shrinkage during dyeing.

[0054] Dyeing: For flat-width dyeing in a rotary kiln, add 1.0% (mass fraction) leveling agent, 0.5 g / L spandex anti-staining agent, 0.3% (mass fraction) spandex coloring agent, 1.3% (mass fraction) Acid Yellow M-2G dye, 1.2% (mass fraction) Acid Black M-RD dye, 2.1% (mass fraction) Acid Black BF dye, and 0.03% (mass fraction) Disperse Black ETF dye to room temperature water. Heat to 80℃ at a rate of 1℃ / min, then add 1.0 g / L spandex anti-staining agent and maintain the temperature for 1 day. 5 min → Heat to 98℃ at a rate of 1.0℃ / min and dye for 40 min → Cool to 50℃ and drain directly, add 1 g / L soda ash and 1 g / L soaping agent, and soap for 30 minutes, followed by two hot washes, each lasting 15 minutes → Heat to 70℃ at a rate of 1.5℃ / min, add 5% (mass fraction) fixing agent and fix for 30 minutes → Cool to 50℃ and drain directly, add 1 g / L soda ash and 1 g / L soaping agent, and soap for 30 minutes → Hot wash twice, each lasting 15 minutes.

[0055] Drying: Temperature 165℃, dry for 50 seconds, ensuring the fabric surface is flat.

[0056] Final shaping: Temperature 165℃, final shaping for 50 seconds, adjust softness, and further stabilize dimensions.

[0057] Example 3

[0058] The raw materials are 30D / 34F nylon 66DTY yarn and 70D spandex filament. The warping tension of the raw materials is 8g for 30D / 34F nylon 66DTY yarn and 2.5g for 70D spandex filament.

[0059] A 138-inch RD2N double-comb double-needle bed warp knitting machine without intermediate connecting combs is selected. From front to back, it includes GB1 comb and GB2 comb. GB1 comb is woven with a variable warp velvet structure, with a padding yarn pattern of 12, 34, 32, 10 / / and a padding yarn digital cycle of 1-2, 3-4, 3-2, 1-0 / / . GB2 comb is woven with a two-needle warp satin structure, with a padding yarn pattern of 10, 12, 23, 21 / / and a padding yarn digital cycle of 1-0, 1-2, 2-3, 2-1 / / . One set of warped 70D spandex filament yarn is coiled onto GB1 comb and threaded using a full-thread method. One set of warped 30D / 34F nylon 66DTY yarn is coiled onto GB2 comb and threaded using a full-thread method.

[0060] The weaving process parameters are set as follows: machine density 27c / cm, GB1 carding warp feed 1620mm / R, spandex draft ratio 60%; GB2 carding warp feed 2450mm / R. The warp feed of GB2 carding 66DTY nylon yarn is relaxed, making the fabric loop column longer. The floats form loop pile on both sides of the fabric, which can cover the relatively small 70D spandex filament.

[0061] Weaving is performed according to the above parameter settings. The double needle beds form loops independently one after the other. The yarns of the GB1 comb and GB2 comb are alternately padded and connected on the front and rear needle beds to obtain a double-sided fleece high-elastic fabric rough fabric without interlayer connection structure.

[0062] The double-sided fleece high-elastic fabric greige is sequentially subjected to flat-width washing, low-temperature pre-setting, high-temperature pre-setting, dyeing, drying, and final finishing to obtain the finished double-sided fleece high-elastic fabric. The process parameters for each step are as follows: Flat-width washing: The washing temperature is 85℃ and the machine speed is 22 meters / min. This process removes impurities such as spinning oil, spandex oil, and knitting needle oil from the raw fabric and causes the fabric to shrink evenly, releasing the internal stress of the fabric.

[0063] Low-temperature pre-forming: Temperature 145℃, pre-forming for 50 seconds, uniform stretching of the fabric weight, and initial dimensional stabilization.

[0064] High-temperature pre-setting: Temperature 205℃, pre-setting time 60s, stabilizes dimensions, flattens the fabric surface, and prevents further shrinkage during dyeing.

[0065] Dyeing: For flat-width dyeing in a rotary kiln, add 1.0% (mass fraction) leveling agent, 0.5 g / L spandex anti-staining agent, 0.3% (mass fraction) spandex coloring agent, 1.3% (mass fraction) Acid Yellow M-2G dye, 1.2% (mass fraction) Acid Black M-RD dye, 2.1% (mass fraction) Acid Black BF dye, and 0.03% (mass fraction) Disperse Black ETF dye to room temperature water. Heat to 80℃ at a rate of 1℃ / min, then add 1.0 g / L spandex anti-staining agent and maintain the temperature for 1 day. 5 min → Heat to 98℃ at a rate of 1.0℃ / min and dye for 40 min → Cool to 50℃ and drain directly, add 1 g / L soda ash and 1 g / L soaping agent, and soap for 30 minutes, followed by two hot washes, each lasting 15 minutes → Heat to 70℃ at a rate of 1.5℃ / min, add 5% (mass fraction) fixing agent and fix for 30 minutes → Cool to 50℃ and drain directly, add 1 g / L soda ash and 1 g / L soaping agent, and soap for 30 minutes → Hot wash twice, each lasting 15 minutes.

[0066] Drying: Temperature 175℃, dry for 60 seconds, ensuring the fabric surface is flat.

[0067] Final shaping: Temperature 175℃, final shaping for 60 seconds, adjust softness, and further stabilize dimensions.

[0068] The performance of the double-sided fleece high-elastic fabrics prepared in Examples 1-3 was tested. A 2-meter section of the finished product was cut from a distance of at least 10 meters from the fabric end for performance testing. The test results are shown in Table 1.

[0069] Table 1 Performance Test Results of Double-Sided Fleece High-Elastic Fabric

[0070] As shown in Table 1, comparing the fabric performance of Examples 1-3, the double-sided fleece high-elastic fabric prepared in Example 1 has the lowest elastic modulus, making it easier to stretch under the same tensile force. It has a soft hand feel, conforms to the body without feeling restrictive, and has a low weight, making it suitable for close-fitting and summer clothing. Its high radial density avoids a smooth, flat surface, resulting in a fine texture. The high spandex content provides sufficient basic tensile potential, but also increases cost. However, its bursting strength is relatively weak, and its abrasion and tear resistance are relatively poor, making it prone to snagging. Its narrow width leads to low cutting utilization and significant garment waste. Furthermore, its relatively low elongation and resilience make it prone to loosening after repeated stretching. In summary, the double-sided fleece high-elastic fabric prepared in Example 1 is suitable for making ultra-thin close-fitting underwear, yoga base layers, lightweight summer shapewear, and disposable elastic fabrics.

[0071] The double-sided fleece high-elastic fabric prepared in Example 2 exhibits superior overall elasticity, with the highest elongation and resilience compared to Examples 1 and 3. It demonstrates greater stretch and better resilience, resisting sagging even after prolonged wear and exhibiting good dimensional stability. Its moderate elastic modulus provides sufficient elasticity without sag, achieving a balance between support and softness. The balanced ratio of nylon and spandex balances elasticity and strength, resulting in moderate durability and controllable cost. Its medium width allows for manageable cutting losses. The weight makes it suitable for all seasons. However, its lower warp density results in a less refined fabric surface compared to Example 1, and slightly inferior breathability and lightweight properties. In conclusion, the double-sided fleece high-elastic fabric prepared in Example 2 is suitable for manufacturing high-end yoga wear, fitness compression garments, everyday shaping pants, and all-season sportswear.

[0072] The double-sided fleece high-elastic fabric prepared in Example 3 has a high basis weight, is thick, and has good windproof and warmth retention, but slightly poor breathability; it has high bursting strength, is abrasion-resistant, snag-resistant, tear-resistant, and has a long service life; it has a high elastic modulus, high tensile resistance, good high-pressure shaping effect, and is not easily deformed; however, its rebound rate and elongation are slightly low, making it prone to loosening and deformation after long-term wear, with small stretch allowance, strong restraint, and low comfort; its warp density is loose, and the fabric texture is relatively coarse; it has a large width, resulting in high cutting utilization. In summary, the double-sided fleece high-elastic fabric prepared in Example 3 is suitable for making high-pressure shaping garments, postoperative repair shapewear, thickened tights for autumn and winter, and outdoor abrasion-resistant elastic workwear, etc.

[0073] As can be seen from the above embodiments, the present invention provides a method for preparing double-sided fleece high-elastic fabric. The weaving process uses an RD2N double-comb double-needle bed warp knitting machine. The RD2N double-comb double-needle bed warp knitting machine includes GB1 combs and GB2 combs, without an intermediate connecting comb. The double needle beds form loops independently, relying solely on the yarns of GB1 combs and GB2 combs alternating between the front and rear needle beds for connection. The division of labor is clear, and their performance is complementary. The variation of the GB1 comb through the plain weave structure is responsible for constructing a two-way elastic network and structural stability, ensuring the overall structural stability and two-way balanced elasticity of the fabric. The two-needle satin weave of the GB2 comb is responsible for controlling the fabric thickness and the fineness of the fleece surface, achieving a lightweight fabric. The GB1 comb and GB2 comb adopt... By employing a differentiated combination of padding yarn movements, with two sets of padding yarn movements cyclically matched and looping phases coordinated, the technical bottleneck of traditional double-sided fleece fabrics being unable to simultaneously achieve stability, high elasticity, and lightweight properties is overcome. The double comb uses a differentiated combination of raw materials, namely 30-70D spandex filaments and 10-30D nylon DTY yarns, giving the fabric both high-ratio double-sided elasticity and excellent anti-sag and washability. After multiple washes, the elasticity decreases little, the dimensional deformation rate is low, and the dimensional stability and resilience durability are significantly better than traditional weft-knitted and ordinary warp-knitted double-sided fleece fabrics. The process parameters of the preparation method are controllable, and the resulting high-elastic double-sided fleece fabric is suitable for various application scenarios and has broad prospects for industrialization and promotion.

[0074] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a double-sided fleece high-elastic fabric, characterized in that, This includes the sequential weaving and dyeing processes; The weaving process uses an RD2N double-comb double-needle bed warp knitting machine, which includes GB1 comb and GB2 comb, without intermediate connecting comb; the double needle beds form loops independently, and the woven fabric has no interlayer connecting structure, relying solely on the yarns of GB1 comb and GB2 comb to alternately pad the yarns on the front and rear needle beds for connection. The GB1 comb is woven using a variable warp velvet weave, while the GB2 comb is woven using a two-needle warp satin weave.

2. The method for preparing double-sided fleece high-elastic fabric according to claim 1, characterized in that, The padding yarn structure of the GB1 comb is: 12, 34, 32, 10 / / , and the yarn threading method is full threading.

3. The method for preparing double-sided fleece high-elastic fabric according to claim 1 or 2, characterized in that, The padding yarn structure of the GB2 comb is: 10, 12, 23, 21 / / , and the yarn threading method is full threading.

4. The method for preparing double-sided fleece high-elastic fabric according to claim 3, characterized in that, The GB1 comb has a yarn-threading component of 30~70D spandex filament, and the GB2 comb has a yarn-threading component of 10~30D nylon DTY filament.

5. The method for preparing double-sided fleece high-elastic fabric according to claim 4, characterized in that, The number of single filaments of the 10~30D nylon DTY yarn is 12~96F.

6. The method for preparing double-sided fleece high-elastic fabric according to claim 4 or 5, characterized in that, The dyeing and finishing process includes sequential steps of flat-width washing, pre-setting, dyeing, and final setting.

7. The method for preparing double-sided fleece high-elastic fabric according to claim 6, characterized in that, The predetermined type includes a low-temperature predetermined type and a high-temperature predetermined type, which are carried out sequentially.

8. The method for preparing double-sided fleece high-elastic fabric according to claim 7, characterized in that, The temperature for the low-temperature pre-conditioning is 135~145℃, and the low-temperature pre-conditioning time is 30~50s; The temperature for the high-temperature pre-conditioning is 195~205℃, and the high-temperature pre-conditioning time is 40~60s.

9. The double-sided fleece high-elastic fabric prepared by the preparation method according to any one of claims 1 to 8.

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