Elastic wool worsted fabric containing low-temperature spandex and production method of elastic wool worsted fabric

Abstract

The invention discloses an elastic wool worsted fabric containing low-temperature spandex and a production method of the elastic wool worsted fabric, and relates to the technical field of wool spinning fabric processing, yarn components adopted by the elastic wool worsted fabric are wool fibers and synthetic fibers, the content ratio of the wool fibers is 30%-70%, and the content ratio of the synthetic fibers is 70%-30% correspondingly; wool fibers and synthetic fibers are subjected to wool top dyeing, mixed carding and doubling of low-temperature spandex to obtain wool ammonia yarns, the wool ammonia yarns are subjected to weaving and after-treatment to prepare the elastic wool worsted fabric, and the elastic wool worsted fabric is 1 / 1 plain weave or 2 / 2 twill or variable texture fabric. The production method comprises the following steps: respectively carrying out wool top dyeing on the wool fibers and the synthetic fibers, then carrying out mixed carding, then doubling low-temperature spandex to prepare wool ammonia yarns, then weaving the prepared wool ammonia yarns by using a weaving machine, and finally carrying out after-treatment on the woven fabric to obtain the elastic wool worsted fabric. The method solves the problem of great color change from gray fabric to finished products due to high-temperature setting.

Description

Technical Field

[0001] The invention relates to the technical field of wool fabric processing, in particular to an elastic wool worsted fabric containing low-temperature spandex and a production method thereof. Background Art

[0002] Polyurethane fiber (abbreviated as spandex) is generally not used directly in textiles, but is spun together with nylon, polyester, cotton, wool and other fibers (where the mass fraction of spandex is 1%-10%) to form "core-spun yarn" or "covered yarn".

[0003] In the process of producing wool worsted fabrics containing spandex, some problems will arise in the high-temperature shaping stage of spandex fabrics above 180°C, such as: 1) the color of the grey cloth to the finished product changes greatly due to high-temperature shaping; 2) the wastewater and waste gas generated by high-temperature shaping causes environmental pollution and increases the cost of sewage treatment; 3) the unstable shaping temperature affects the steaming index, and multiple shaping processes are required to increase costs and cause a decrease in the strength index of the fabric.

[0004] Therefore, consider using low-temperature spandex to produce wool worsted fabrics. Summary of the invention

[0005] Aiming at the defects existing in the current production process of wool worsted fabric containing spandex, the invention provides an elastic wool worsted fabric containing low-temperature spandex and a production method thereof.

[0006] In the first aspect, the present invention provides an elastic wool worsted fabric containing low-temperature spandex, and the technical solution adopted to solve the above technical problems is as follows:

[0007] An elastic wool worsted fabric containing low-temperature spandex, wherein the yarn components used in the fabric are wool fiber and synthetic fiber, wherein the wool fiber content accounts for 30%-70%, and the synthetic fiber content accounts for 70%-30% correspondingly;

[0008] Wool fiber and synthetic fiber are dyed, blended and doubling with low-temperature spandex to obtain wool-spandex yarn, which is then woven and finished to make elastic wool worsted fabric. The elastic wool worsted fabric is 1 / 1 plain or 2 / 2 twill or variable weave fabric.

[0009] Optionally, the fineness of the wool fiber is 16μm-20μm, and the length is 70mm-80mm; the fineness of the synthetic fiber is 2D-3D, and the length is 70mm-90mm.

[0010] Optionally, the low-temperature spandex involved is spandex fiber produced by melt spinning technology, with a specification of 40D-45D, and needs to undergo a temperature setting treatment at a maximum of 150°C during the production process or subsequent processing.

[0011] In a second aspect, the present invention provides a method for producing an elastic wool worsted fabric containing low-temperature spandex, and the technical solution adopted to solve the above technical problems is as follows:

[0012] A method for producing an elastic wool worsted fabric containing low-temperature spandex, comprising the following steps:

[0013] S1. Select wool fiber and synthetic fiber, wherein the content of wool fiber is 30%-70%, and the content of synthetic fiber is 70%-30% correspondingly, and dye the wool fiber and synthetic fiber respectively;

[0014] S2, combing the wool fiber and the synthetic fiber dyed in step S1 and then doubling them into low-temperature spandex to obtain wool-spandex yarn;

[0015] S3, using a loom to weave the wool-spandex yarn obtained in step S2;

[0016] S4, post-finishing the fabric woven in step S3 to obtain an elastic wool worsted fabric.

[0017] Optionally, step S1 is performed to dye the wool fibers, and the specific operations are as follows:

[0018] S1.1.1. Add environmentally friendly reactive dyes, leveling agents and defoamers into the dye bath, and adjust the pH value of the dye bath to 4-5 with formic acid;

[0019] S1.1.2, adjust the dye bath temperature to 20℃-30℃, immerse the wool fiber, start dyeing, then gradually increase the temperature of the dye bath at a heating rate of 0.5℃ / min-2℃ / min until the dye bath temperature reaches 90℃-99℃, and keep it warm for 40min-60min;

[0020] S1.1.3. After the holding time is reached, the dye bathtub is cooled down naturally to 20℃-30℃, then the dye bathtub is emptied, water is added to the dye bathtub until the wool fibers are covered, and ammonia water is added to adjust the pH value to 8-8.5, and then the dye bathtub is heated up in stages at a heating rate of 1℃ / min-2℃ / min until the temperature reaches 80℃-85℃, and the temperature is kept for 20min-30min; water is added to the dye bathtub again to rinse the wool fibers, remove excess dyes and chemical additives, and then take the wool out of the bathtub;

[0021] S1.1.4, add antistatic agent to rewash the wool fibers after leaving the vat;

[0022] Execute step S1 to dye the synthetic fiber strips. The specific operations are as follows:

[0023] S1.2.1. Add low-temperature disperse dye and dispersant into the dye bath, and adjust the pH value of the dye bath to 5-6 with acetic acid;

[0024] S1.2.2, adjust the temperature of the dye bath to 40℃-60℃, immerse the wool fiber and start dyeing, first heat the dye bath to 80℃-95℃ at a heating rate of 1℃ / min-3℃ / min, then heat the dye bath to 110℃-120℃ at a heating rate of 0.5℃ / min-2℃ / min, and keep warm for 70min-80min;

[0025] S1.2.3. After the holding time is reached, cool the dye bath at a cooling rate of 1°C / min-3°C / min until the temperature of the dye bath drops to 40°C-60°C, drain the dye bath, rinse the dyed synthetic fibers with water, and remove excess dyes and chemical additives;

[0026] S1.2.4. Add antistatic agent to rewash the rinsed synthetic fibers.

[0027] Optionally, step S2 is performed to comb the dyed wool fibers and synthetic fibers together. The specific operation is as follows:

[0028] S2.1.1, drawing and blending: the dyed wool fiber and synthetic fiber are drawn separately, and the two synthetic slivers are blended to make the wool fiber and synthetic fiber fully interlaced and evenly mixed;

[0029] S2.1.2, Combing and needle combing: Use a combing machine to comb the mixed fibers to remove impurities; the combing process adopts a processing technology of dense needles, small gauge, low speed, small feed and small draft.

[0030] Further optionally, step S2 is performed to mix and comb the dyed wool fiber and the synthetic fiber and then combine them into low-temperature spandex to produce wool-spandex yarn, which specifically includes the following process:

[0031] S2.2.1, roving and spinning: the combed fiber is first made into roving, and then further processed into spinning. The spinning is a composite yarn with elasticity and warmth retention formed by blending a single fiber with low-temperature spandex fiber. The CV value of the roving process is controlled within 5.5%, and the spinning speed is controlled between 7500r / min-8000r / min;

[0032] S2.2.2, winding and doubling: the spun yarn is wound into a bobbin shape by a winding machine, and then the composite yarn spun through the spun yarn process is combined and doubling with the normal Z-twisted wool yarn by doubling; the tension of the winding machine is 4-6cN, and the doubling speed is controlled between 700m / min-750m / min;

[0033] S2.2.3, double twisting and yarn steaming: after doubling, the strands are twisted by a double twisting machine; during the twisting process, the twist coefficient is set to 170, and the same-direction twisting method without triangle area is adopted. The strands after twisting are twisted by 8-10 counts; during the double twisting process, the CV value is controlled at 16%-17%, the twist deviation is controlled within 4-5%, the yarn steaming temperature is controlled between 70℃-90℃, and the time is controlled between 20-30 minutes.

[0034] Preferably, when executing step S2, the low-temperature spandex involved is spandex fiber produced by melt spinning technology, with a specification of 40D-45D, and needs to be subjected to a temperature setting treatment of up to 150° C. during the production process or subsequent processing;

[0035] The fineness of the obtained wool-spandex yarn is 60-100Nm / 2 or 40-50Nm / 1, and the twist is 870-1120 twists / m.

[0036] Optionally, step S3 is performed, and when the wool-spandex yarn is weaved by a loom, the warp and weft density of the weaving machine is 220-340×250-320 yarns / 10cm, and the reeding is 2-4 yarns / reed.

[0037] Optionally, step S4 is performed to perform post-finishing on the woven fabric, and the specific operation is as follows:

[0038] S4.1, raw repair, singeing, flat washing and continuous boiling, where the singeing speed is 100m / min-120m / min, and the singeing flame temperature is 150℃-170℃;

[0039] S4.2, soft washing, opening, and drying, wherein the washing temperature is 30°C-40°C, and the washing speed is 180m / min-200m / min;

[0040] S4.3, trimming, brushing and shearing, where the shearing is done with four blades and the shearing speed is 18m / min-20m / min;

[0041] S4.4, drying, wherein the vehicle speed is controlled between 20m / min-25m / min, the overfeed is controlled between 9%-12%, and the temperature is controlled between 120℃-140℃;

[0042] S4.5, shaping, wherein the vehicle speed is controlled between 15m / min-20m / min, the overfeed is controlled between 12%-15%, and the temperature is controlled between 130℃-150℃;

[0043] S4.6, decatizing, wherein the decatizing temperature is controlled between 100°C and 120°C, and the decatizing pressure is controlled between 0.5MPa and 0.8MPa;

[0044] S4.7, adding materials for drying and re-desiccation, wherein the re-desiccation temperature is controlled between 100°C and 120°C, and the re-desiccation pressure is controlled between 0.5MPa and 0.8MPa.

[0045] The elastic wool worsted fabric containing low-temperature spandex and the production method thereof of the present invention have the following beneficial effects compared with the prior art:

[0046] 1. The elastic wool worsted fabric of the present invention can improve the problem of large color changes caused by high temperature setting, which is beneficial to color control and stability;

[0047] 2. The production method of elastic wool worsted fabric of the present invention improves the problem of large color changes caused by high-temperature setting, is beneficial to color control and stability, is beneficial to fabric steam shrinkage and dimensional stability, can shorten the post-finishing process, reduce the use of water, electricity and gas, is beneficial to cost control, and can also reduce energy consumption and waste generation, reduce dependence on traditional chemical setting, thereby reducing the difficulty of wastewater and waste gas treatment and environmental pollution. DETAILED DESCRIPTION

[0048] In order to make the technical solution, the technical problem solved and the technical effect of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in conjunction with specific embodiments.

[0049] Embodiment 1:

[0050] This embodiment provides an elastic wool worsted fabric containing low-temperature spandex, wherein the yarn components used in the fabric are wool fiber and synthetic fiber, wherein the content of wool fiber accounts for 30%-70%, and the content of synthetic fiber accounts for 70%-30% correspondingly;

[0051] Wool fiber and synthetic fiber are dyed, blended and doubling with low-temperature spandex to obtain wool-spandex yarn, which is then woven and finished to make elastic wool worsted fabric. The elastic wool worsted fabric is 1 / 1 plain or 2 / 2 twill or variable weave fabric.

[0052] The wool fiber involved in this embodiment has a fineness of 16 μm-20 μm and a length of 70 mm-80 mm; the synthetic fiber has a fineness of 2D-3D and a length of 70 mm-90 mm.

[0053] This embodiment specifically uses the Z305 series spandex fiber of Hebei Bangtai Spandex Technology Co., Ltd., which is only available in black and white. This low-temperature spandex is a spandex fiber produced by melt spinning technology, with a specification of 40D-45D. During the production process or subsequent processing, it needs to be subjected to a temperature setting treatment of up to 150°C. The production process of this spandex fiber is clean, low-carbon and green manufacturing, does not consume water resources, does not add DMF, DMAC solvents, does not add toxic substances such as amine additives, and the fiber has no harmful substances remaining. It is safe and healthy, soft and comfortable, and has good resilience. Low-temperature spandex is currently the only degradable and renewable elastic fiber with the characteristics of green, healthy, low-carbon, safe, and technological. Specifically, the test data comparison of low-temperature spandex and normal spandex fiber is shown in Table 1.

[0054] Table 1

[0055]

[0056] Embodiment 2:

[0057] This embodiment provides a method for producing an elastic wool worsted fabric containing low-temperature spandex, which comprises the following steps:

[0058] S1. Select wool fiber and synthetic fiber, wherein the wool fiber accounts for 30%-70% and the synthetic fiber accounts for 70%-30%;

[0059] Wool and synthetic fibers are top dyed separately.

[0060] S1.1. Dyeing wool fibers in wool tops. The specific operation is as follows:

[0061] S1.1.1. Add environmentally friendly reactive dyes, leveling agents and defoamers into the dye bath, and adjust the pH value of the dye bath to 4-5 with formic acid;

[0062] S1.1.2, adjust the dye bath temperature to 20℃-30℃, immerse the wool fiber, start dyeing, then gradually increase the temperature of the dye bath at a heating rate of 0.5℃ / min-2℃ / min until the dye bath temperature reaches 90℃-99℃, and keep it warm for 40min-60min;

[0063] S1.1.3. After the holding time is reached, the dye bathtub is cooled down naturally to 20℃-30℃, then the dye bathtub is emptied, water is added to the dye bathtub until the wool fibers are covered, and ammonia water is added to adjust the pH value to 8-8.5, and then the dye bathtub is heated up in stages at a heating rate of 1℃ / min-2℃ / min until the temperature reaches 80℃-85℃, and the temperature is kept for 20min-30min; water is added to the dye bathtub again to rinse the wool fibers, remove excess dyes and chemical additives, and then take the wool out of the bathtub;

[0064] S1.1.4. Add antistatic agent to rewash the wool fibers after they leave the vat.

[0065] S1.2. Dyeing of synthetic fibers. The specific operation is as follows:

[0066] S1.2.1. Add low-temperature disperse dye and dispersant into the dye bath, and adjust the pH value of the dye bath to 5-6 with acetic acid;

[0067] S1.2.2, adjust the temperature of the dye bath to 40℃-60℃, immerse the wool fiber and start dyeing, first heat the dye bath to 80℃-95℃ at a heating rate of 1℃ / min-3℃ / min, then heat the dye bath to 110℃-120℃ at a heating rate of 0.5℃ / min-2℃ / min, and keep warm for 70min-80min;

[0068] S1.2.3. After the holding time is reached, cool the dye bath at a cooling rate of 1°C / min-3°C / min until the temperature of the dye bath drops to 40°C-60°C, drain the dye bath, rinse the dyed synthetic fibers with water, and remove excess dyes and chemical additives;

[0069] S1.2.4. Add antistatic agent to rewash the rinsed synthetic fibers.

[0070] When executing step S1, the equipment used for dyeing includes: using the American Datercoler color measuring and matching instrument, the Italian DATDCOLOUR automatic dripping system, the German DES automatic dye decomposition system, the German DES Eco-Bloc-X1100LB dyeing machine, and the Italian CMT wool top rewashing machine.

[0071] S2, combing the wool fiber and the synthetic fiber dyed in step S1 and then doubling them into low-temperature spandex to obtain wool-spandex yarn.

[0072] In this step, the dyed wool fibers and synthetic fibers are combed together, and the specific operation is as follows:

[0073] S2.1.1, drawing and blending: the dyed wool fiber and synthetic fiber are drawn separately, and the two synthetic slivers are blended to make the wool fiber and synthetic fiber fully interlaced and evenly mixed;

[0074] S2.1.2, Combing and needle combing: Use a combing machine to comb the mixed fibers to remove impurities; the combing process adopts a processing technology of dense needles, small gauge, low speed, small feed and small draft.

[0075] The mixing process parameters are shown in Table 2.

[0076] Table 2

[0077]

[0078] In this step, the dyed wool fiber and the synthetic fiber are combed and then combined into low-temperature spandex to obtain wool-spandex yarn, which specifically includes the following processes:

[0079] S2.2.1, roving and spinning: the combed fiber is first made into roving, and then further processed into spinning. The spinning is a composite yarn with elasticity and warmth retention formed by blending a single fiber with low-temperature spandex fiber. The CV value of the roving process is controlled within 5.5%, and the spinning speed is controlled between 7500r / min-8000r / min;

[0080] S2.2.2, winding and doubling: the spun yarn is wound into a bobbin shape by a winding machine, and then the composite yarn spun through the spinning process is doubling with the normal Z-twisted wool yarn (normal Z-twisted wool yarn refers to the spun yarn without low-temperature spandex. During the twisting process, the yarn tilts from the lower left corner to the upper right corner, forming a shape similar to the letter "Z") to form a strand; the winding machine tension is 4-6cN, and the doubling speed is controlled between 700m / min-750m / min;

[0081] S2.2.3, double twisting and yarn steaming: after doubling, the strands are twisted by a double twisting machine; during the twisting process, the twist coefficient is set to 170, and the same-direction twisting method without triangle area is adopted. The strands after twisting are twisted by 8-10 counts; during the double twisting process, the CV value is controlled at 16%-17%, the twist deviation is controlled within 4-5%, the yarn steaming temperature is controlled between 70℃-90℃, and the time is controlled between 20-30 minutes.

[0082] This embodiment specifically uses Z305 series spandex fiber from Hebei Bangtai Spandex Technology Co., Ltd., which is available in only two colors, black and white. This low-temperature spandex is produced by melt spinning technology, with a specification of 40D-45D. During the production process or subsequent processing, it needs to be subjected to a temperature setting treatment of up to 150°C; the fineness of the obtained wool-spandex yarn is 60-100Nm / 2 or 40-50Nm / 1, and the twist is 870-1120 twists / m.

[0083] When executing step S2, the equipment configuration used for the mixed combing includes: a combing machine from NSC of France, a gill combing machine from Sant'Andrea of ​​Italy, a spinning frame from Oerlikon of Germany, a winding machine from SAVIO of Italy, a yarn combining machine from SSM of Switzerland, a two-for-one twisting machine from SAVIO of Italy, and a yarn steaming machine from OBEM of Italy.

[0084] S3, utilizing a loom to weave the wool-spandex yarn obtained in step S2.

[0085] The warp and weft density of the weaving machine is 220-340×250-320 strands / 10cm, and the reed is 2-4 strands / reed.

[0086] When executing step S3, the loom is an Optimax loom, and the parameters of the Optimax loom are set as follows: the flatness of the heald is 300-350°, the tension is 1.2-1.8 kN, the height of the heald is 185 / 180 mm, and the speed is 450-500 r / min.

[0087] S4, post-finishing the fabric woven in step S3 to obtain an elastic wool worsted fabric.

[0088] The specific operations of post-processing are as follows:

[0089] S4.1, Raw repair, singeing, flat washing and boiling; Among them, the singeing speed is 100m / min-120m / min, and the singeing flame temperature is 150℃-170℃.

[0090] Raw repair is a preliminary inspection and trimming of the woven fabrics to remove surface defects and uneven parts; singeing is the use of flames to burn off the fluff on the surface of the fabric to make the surface of the fabric smoother and flatter; flat washing and boiling is to soak the fabric in water containing detergent for cleaning to remove impurities and stains on the fabric.

[0091] S4.2, washing the fabric softly, opening the fabric width, and drying the fabric, wherein the washing temperature is 30°C-40°C, and the washing speed is 180m / min-200m / min.

[0092] Softening the fabric is made soft and comfortable through designated detergents and processes; opening the fabric is to unfold the fabric treated with softening the fabric to a predetermined width; drying is to evaporate the moisture in the fabric through hot air or an oven to make the fabric dry.

[0093] S4.3, trimming, brushing and shearing, wherein the shearing is done by four knives and the shearing speed is 18m / min-20m / min.

[0094] Trimming is the finishing work performed on the fabric after a series of processing to ensure that the quality of the fabric meets the requirements; brushing is to use a brush to lightly brush the surface of the fabric to remove dust and impurities on the surface; shearing is to use scissors to cut off excess fibers at the edge of the fabric to make the edge of the fabric neat and beautiful.

[0095] S4.4, drying, wherein the vehicle speed is controlled between 20m / min-25m / min, the overfeed is controlled between 9%-12%, and the temperature is controlled between 120℃-140℃.

[0096] This step is to dry the fabric after the above processing again to remove the residual moisture in the fabric and improve the dimensional stability of the fabric.

[0097] S4.5, shaping, wherein the vehicle speed is controlled between 15m / min-20m / min, the overfeed is controlled between 12%-15%, and the temperature is controlled between 130℃-150℃.

[0098] The shaping process is to stabilize the shape and size of the fabric through specific equipment and technology. This step is of great significance to improving the quality and performance of the fabric.

[0099] S4.6, decatizing, wherein the decatizing temperature is controlled between 100°C and 120°C, and the decatizing pressure is controlled between 0.5MPa and 0.8MPa.

[0100] Etching is the process of treating fabrics with steam to improve their feel and appearance. This step makes the fabric softer, smoother and has a good gloss.

[0101] S4.7, adding materials for drying and re-desiccation, wherein the re-desiccation temperature is controlled between 100°C and 120°C, and the re-desiccation pressure is controlled between 0.5MPa and 0.8MPa.

[0102] After decatizing, the fabric can be treated with additional materials (such as softener, waterproofing agent, etc.) as needed, and then dried and decatized to further improve the performance and quality of the fabric.

[0103] The equipment used in step S4 includes: a singeing machine from OSTOFF of Germany, a washing and shrinking combined machine from CIMI of Italy and M-TEC of Germany, a flat washing and boiling machine from CIMI of Italy, a drying and shaping machine from KRANTZ of Germany, a four-knife shearing machine from LAFER of Italy, and a can steaming machine from Esprorot of Italy.

[0104] In this embodiment, the elastic wool worsted fabric produced by low-temperature spandex is compared with the wool worsted fabric produced by normal DuPont Lycra. The indicators are compared in Table 3 below.

[0105] Table 3

[0106]

[0107]

[0108] It can be seen from Table 3 that the elastic wool worsted fabric produced by using low-temperature spandex has the following advantages:

[0109] The low-temperature spandex is set at 150℃ once or unset, and the fabric indicators of steaming size change rate and elastic elongation after drying and steaming can meet the national standard requirements (National Combed Elastic Wool Fabric Standard FZ / T24006-2015), which solves the problem of large color changes from grey cloth to finished product due to high-temperature setting. The color rating standard meets the national combed wool fabric GB / T26382-2024.

[0110] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elastic wool worsted fabric containing low-temperature spandex, characterized in that: The yarn components used in the fabric are wool fiber and synthetic fiber, wherein the content of wool fiber accounts for 30%-70%, and the content of synthetic fiber accounts for 70%-30% accordingly; The wool fiber and the synthetic fiber are dyed, combed and doubling with low-temperature spandex to obtain wool-spandex yarn, and the wool-spandex yarn is woven and finished to make elastic wool worsted fabric, which is 1 / 1 plain weave or 2 / 2 twill or variable weave fabric.

2. The elastic wool worsted fabric containing low-temperature spandex according to claim 1, characterized in that: The wool fiber has a fineness of 16 μm-20 μm and a length of 70 mm-80 mm; the synthetic fiber has a fineness of 2D-3D and a length of 70 mm-90 mm.

3. The elastic wool worsted fabric containing low-temperature spandex according to claim 1, characterized in that: The low-temperature spandex is a spandex fiber produced by melt spinning technology, with a specification of 40D-45D. During the production process or subsequent processing, it needs to undergo a temperature setting treatment at a maximum of 150°C.

4. A method for producing elastic wool worsted fabric containing low-temperature spandex, characterized in that: The following steps are involved: S1. Select wool fiber and synthetic fiber, wherein the content of wool fiber is 30%-70%, and the content of synthetic fiber is 70%-30% correspondingly, and dye the wool fiber and synthetic fiber respectively; S2, combing the wool fiber and the synthetic fiber dyed in step S1 and then doubling them into low-temperature spandex to obtain wool-spandex yarn; S3, using a loom to weave the wool-spandex yarn obtained in step S2; S4, post-finishing the fabric woven in step S3 to obtain an elastic wool worsted fabric.

5. The method for producing an elastic wool worsted fabric containing low-temperature spandex according to claim 4, characterized in that: Execute step S1 to dye the wool fibers. The specific operation is as follows: S1.1.

1. Add environmentally friendly reactive dyes, leveling agents and defoamers into the dye bath, and adjust the pH value of the dye bath to 4-5 with formic acid; S1.1.2, adjust the dye bath temperature to 20℃-30℃, immerse the wool fiber, start dyeing, then gradually increase the temperature of the dye bath at a heating rate of 0.5℃ / min-2℃ / min until the dye bath temperature reaches 90℃-99℃, and keep it warm for 40min-60min; S1.1.

3. After the holding time is reached, the dye bathtub is cooled down naturally to 20℃-30℃, then the dye bathtub is emptied, water is added to the dye bathtub until the wool fibers are covered, and ammonia water is added to adjust the pH value to 8-8.5, and then the dye bathtub is heated up in stages at a heating rate of 1℃ / min-2℃ / min until the temperature reaches 80℃-85℃, and the temperature is kept for 20min-30min; water is added to the dye bathtub again to rinse the wool fibers, remove excess dyes and chemical additives, and then take the wool out of the bathtub; S1.1.4, add antistatic agent to rewash the wool fibers after leaving the vat; Execute step S1 to dye the synthetic fiber strips. The specific operations are as follows: S1.2.

1. Add low-temperature disperse dye and dispersant into the dye bath, and adjust the pH value of the dye bath to 5-6 with acetic acid; S1.2.2, adjust the temperature of the dye bath to 40℃-60℃, immerse the wool fiber and start dyeing, first heat the dye bath to 80℃-95℃ at a heating rate of 1℃ / min-3℃ / min, then heat the dye bath to 110℃-120℃ at a heating rate of 0.5℃ / min-2℃ / min, and keep warm for 70min-80min; S1.2.

3. After the holding time is reached, cool the dye bath at a cooling rate of 1°C / min-3°C / min until the temperature of the dye bath drops to 40°C-60°C, drain the dye bath, rinse the dyed synthetic fibers with water, and remove excess dyes and chemical additives; S1.2.

4. Add antistatic agent to rewash the rinsed synthetic fibers.

6. The method for producing an elastic wool worsted fabric containing low-temperature spandex according to claim 4, characterized in that: Step S2 is performed to comb the dyed wool fibers and synthetic fibers together. The specific operation is as follows: S2.1.1, drawing and blending: the dyed wool fiber and synthetic fiber are drawn separately, and the two synthetic slivers are blended to make the wool fiber and synthetic fiber fully interlaced and evenly mixed; S2.1.2, Combing and needle combing: Use a combing machine to comb the mixed fibers to remove impurities; the combing process adopts a processing technology of dense needles, small gauge, low speed, small feed and small draft.

7. The method for producing an elastic wool worsted fabric containing low-temperature spandex according to claim 6, characterized in that: Step S2 is performed to mix and comb the dyed wool fiber and the synthetic fiber and then combine them into low-temperature spandex to obtain wool-spandex yarn, which specifically includes the following process: S2.2.1, roving and spinning: the combed fiber is first made into roving, and then further processed into spinning. The spinning is a composite yarn with elasticity and warmth retention formed by blending a single fiber with low-temperature spandex fiber. The CV value of the roving process is controlled within 5.5%, and the spinning speed is controlled between 7500r / min-8000r / min; S2.2.2, winding and doubling: the spun yarn is wound into a bobbin shape by a winding machine, and then the composite yarn spun through the spun yarn process is combined and doubling with the normal Z-twisted wool yarn by doubling; the tension of the winding machine is 4-6cN, and the doubling speed is controlled between 700m / min-750m / min; S2.2.3, double twisting and yarn steaming: after doubling, the strands are twisted by a double twisting machine; during the twisting process, the twist coefficient is set to 170, and the same-direction twisting method without triangle area is adopted. The strands after twisting are twisted by 8-10 counts; during the double twisting process, the CV value is controlled at 16%-17%, the twist deviation is controlled within 4-5%, the yarn steaming temperature is controlled between 70℃-90℃, and the time is controlled between 20-30 minutes.

8. The method for producing an elastic wool worsted fabric containing low-temperature spandex according to claim 7, characterized in that: When executing step S2, the low-temperature spandex is spandex fiber produced by melt spinning technology, with a specification of 40D-45D, and needs to be subjected to a temperature setting treatment of up to 150° C. during the production process or subsequent processing; The fineness of the obtained wool-spandex yarn is 60-100Nm / 2 or 40-50Nm / 1, and the twist is 870-1120 twists / m.

9. The method for producing an elastic wool worsted fabric containing low-temperature spandex according to claim 4, characterized in that: Execute step S3, when using a loom to weave the wool-spandex yarn, the warp and weft density of the weaving machine is 220-340×250-320 yarns / 10cm, and the reed is 2-4 yarns / reed.

10. The method for producing an elastic wool worsted fabric containing low-temperature spandex according to claim 4, characterized in that: Execute step S4, and the specific operation of post-finishing the woven fabric is as follows: S4.1, raw repair, singeing, flat washing and continuous boiling, where the singeing speed is 100m / min-120m / min, and the singeing flame temperature is 150℃-170℃; S4.2, soft washing, opening, and drying, wherein the washing temperature is 30°C-40°C, and the washing speed is 180m / min-200m / min; S4.3, trimming, brushing and shearing, where the shearing is done with four blades and the shearing speed is 18m / min-20m / min; S4.4, drying, wherein the vehicle speed is controlled between 20m / min-25m / min, the overfeed is controlled between 9%-12%, and the temperature is controlled between 120℃-140℃; S4.5, shaping, wherein the vehicle speed is controlled between 15m / min-20m / min, the overfeed is controlled between 12%-15%, and the temperature is controlled between 130℃-150℃; S4.6, decatizing, wherein the decatizing temperature is controlled between 100°C and 120°C, and the decatizing pressure is controlled between 0.5MPa and 0.8MPa; S4.7, adding materials for drying and re-desiccation, wherein the re-desiccation temperature is controlled between 100°C and 120°C, and the re-desiccation pressure is controlled between 0.5MPa and 0.8MPa.

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