Production method of plain-color micro-suede wool fabric

Abstract

The invention discloses a production method of plain-color micro-suede wool fabric. The production method sequentially comprises the steps of washing, drying, decating for the first time, piece dyeing, brushing and shearing, drying and setting, decating for the second time, scale stripping and washing. Fibers of the plain micro-suede wool fabric are merino fine wool; the piece dyeing liquor is prepared from acid dye, 0.2% o.w.f to 1% o.w.f of leveling agent, 4% o.w.f to 9% o.w.f of retarding agent anhydrous sodium sulphate, 0.4% o.w.f to 3% o.w.f of permeation defoaming agent and water; the pH value of the dye liquor is 5-6; the dyeing temperature is 90-98 DEG C, and the temperature is kept for 30-60 minutes. According to the production method of the plain-color micro-suede wool fabric, the plain-color micro-suede wool fabric is prepared by dyeing and then scale stripping, which is different from the conventional step sequence of firstly scale stripping and then dyeing, and the one-time success rate of plain-color dyeing is as high as 90%; compared with a wool fabric which is firstly scaled and then dyed, the plain-color micro-suede wool fabric has the advantages that the color defect and color spot probability is obviously reduced, the color difference of sections is small, and the plain color chromaticity consistency is high.

Description

Technical Field

[0001] The present invention relates to the technical field of wool fabric production, and particularly to a production method of a plain-colored micro-velvet wool fabric. Background Art

[0002] The production of wool fabrics with colors mainly includes two methods: one is top dyeing, and the dyed top is woven into cloth; the other is to first weave the top into cloth and then perform piece dyeing on the fabric. Wool is descaled to obtain mercerized wool, and the descalation treatment of wool is usually also divided into two types: top descalation and fabric surface descalation.

[0003] "Comparison of the Changes in Dyeing Properties of Mercerized Wool" in the 8th issue of "Wool Textile Journal" in 2008 pointed out that when acid scarlet dye is used for dyeing mercerized wool and ordinary wool, in the initial stage of dyeing (30 min) and at a lower temperature (30 - 40 °C), the dyeing of mercerized wool is rapid, and the maximum dyeing rate can be 10 times higher than that of wool. Therefore, the conventional process sequence for wool fabric production is to descale first and then dye.

[0004] The wool fibers of mercerized wool fabrics have a consistent degree of descalation on the surface after top descalation treatment; in contrast, after the fabric surface is descalated, there are obvious differences in the degree of descalation between the surface fluff and the wool fibers deep in the fabric yarns; and the surface fluff of the fabric that is descalated first and then dyed lacks the protection of the scale layer, so the fabric is smooth after being infiltrated by the dye liquor, and the probability of slipping and abrasion during the piece dyeing process is relatively high. Based on the above factors, even if auxiliaries such as leveling agents and dyeing retarding agents are added to the dye liquor of the descalated fabric, color streaks, color spots, and color differences in each section of the fabric are still likely to occur, especially in plain-colored fabrics. Summary of the Invention

[0005] One of the purposes of the present invention is to overcome the defects existing in the prior art, and provide a production method of a plain-colored micro-velvet wool fabric. Through the production process of dyeing first and then descalating, and setting brushing, drying and setting, and second decating between dyeing and descalating, which is beneficial to improving the uniformity of descalation, the probability of color streaks and color spots on the fabric is reduced, and the qualified rate of plain-colored fabrics is improved.

[0006] In order to obtain the above technical effects, the technical solution of the present invention is: a production method of a plain-colored micro-velvet wool fabric, including the steps of scouring, drying, first decating, piece dyeing, brushing, drying and setting, second decating, descalating, and water washing in sequence;

[0007] The fiber of the plain-colored micro-velvet wool fabric is merino fine wool;

[0008] The composition of the piece-dyeing liquor includes acid dyes, 0.2% o.w.f - 1% o.w.f leveling agent, 4% o.w.f - 9% o.w.f retarder sodium sulfate, 0.4% o.w.f - 3% o.w.f penetration defoamer and water; the pH value of the liquor is 5 - 6; the dyeing conditions are a temperature of 90 - 98°C and a heat preservation time of 30 - 60 min. Further, the composition of the piece-dyeing liquor includes acid dyes, 0.4% o.w.f - 0.8% o.w.f leveling agent, 4.5% o.w.f - 7.5% o.w.f retarder sodium sulfate, 0.8% o.w.f - 1.2% o.w.f penetration defoamer and water; the pH value of the liquor is 5 - 6; the dyeing conditions are a temperature of 90 - 98°C and a heat preservation time of 30 - 60 min.

[0009] Further, the leveling agent is Albegal SET and the penetration defoamer is Albegal FFA.

[0010] The preferred technical solution is that the process of scale removal is to treat the fabric with a normal-temperature chlorine-containing scale removal liquor in a wetting plus spraying manner, and the fabric after scale removal is successively subjected to the first clear water wash, reduction dechlorination wash and the second clear water wash; the chlorine-containing scale removal liquor is prepared by initially charging and continuously supplementing chlorine into a penetrant solution.

[0011] The composition of the chlorine-containing scale removal liquor includes: a chlorine mass concentration of 4.5 - 8 g / L, a penetrant of 0.5 - 2 g / L and water, and the fabric running speed is 8 - 10 m / min. Specifically, the soaking time of the fabric in the scale removal liquor is 20 - 30 s. Further, the composition of the chlorine-containing scale removal liquor includes: 5 - 7.5 g / L of chlorine, 0.7 - 1.5 g / L of penetrant and water, and the fabric running speed is 8 - 10 m / min. Further, the penetrant is Listril NGS (Stephenson Speciality Chemicals). The chlorine mass concentration refers to the mass-volume ratio of chlorine concentration to the penetrant solution.

[0012] The preferred technical solution is that the piece-dyeing liquor is heat-preserved at 40 - 45°C for 10 - 20 min for dyeing, and then rises to 60 - 70°C at a heating rate of 0.35 - 0.9°C / min, and after heat-preserving for 20 - 30 min, it rises to the dyeing condition temperature again at a heating rate of 0.35 - 0.9°C / min. Further, the heating rate of the piece-dyeing liquor is 0.5 - 0.7°C / min.

[0013] The preferred technical solution is that the yarn of the wool fabric is a double-twist yarn with reverse twists, and the reverse twist degrees of the yarn are not less than 650 twists / meter. In the brushing and shearing step, the fluff on both sides of the fabric surface is cut to less than 0.5 mm. Further, in the brushing and shearing step, the fluff on both sides of the fabric surface is cut to less than 0.35 mm.

[0014] The preferred technical solution is that the first decating and / or the second decating is open - type atmospheric decating, the steam pressure is 0.15 - 0.25 Mpa, and the decating time is not more than 6 min.

[0015] The preferred technical solution is that after the water washing, it further includes in sequence drying, shearing, softening, and the third decating;

[0016] The process parameters of the third decating are: open - type atmospheric decating, the steam pressure is 0.15 - 0.25 Mpa, and the decating time is not more than 6 min.

[0017] The preferred technical solution is that the water washing includes in sequence caustic washing and pickling steps;

[0018] The caustic washing is washing with a soda ash solution, the pH value of the soda ash solution is 7 - 8, the temperature is 40 - 50 °C, and after the caustic washing, it is rinsed with clear water;

[0019] The pickling is to add glacial acetic acid to the washing liquid in the clear - water - rinsing step to adjust the pH value to 6 - 7, and then the fabric is taken out of the machine and dried.

[0020] The preferred technical solution is that the heat setting is to wet the wool fabric with a padding machine and then pad - dry it. The padding pressure is 0.32 - 0.4 Mpa, and the drying is carried out in two stages. The drying temperature of the first stage is 130 - 140 °C, and the drying temperature of the second stage is 145 - 155 °C.

[0021] The preferred technical solution is that the washing liquid for the reduction dechlorination washing is a sodium metabisulfite solution, and the concentration of the sodium metabisulfite solution is 0.7 - 1.5 g / L. Further, the concentration of the sodium metabisulfite solution is 0.8 - 1.3 g / L. Furthermore, the washing liquid for the reduction dechlorination washing further includes polyols such as glycerol, ethylene glycol, propylene glycol, and sorbitol, and the concentration of ethylene glycol is 2 - 7 g / L. Still further, the washing liquid for the reduction dechlorination washing is placed in an ultrasonic cleaning tank, and the ultrasonic frequency is 40 - 60 kHz.

[0022] The preferred technical solution is that the cloth washing includes in sequence open - width cloth washing, drying, rope - form cloth washing, open - width cloth washing, and double - boiling;

[0023] The double - boiling includes the following cyclic steps: The fabric is wound around the decating roller in the first decating tank. After the feeding is completed, the decating in the first decating tank starts. After the decating in the first decating tank is completed, the fabric is reversed and wound around the decating roller in the second decating tank, and the inner and outer layers of the winding structure are exchanged. After the feeding is completed, the decating in the second decating tank starts until the decating in the second decating tank is completed;

[0024] The decating temperature is 80 - 90 °C, and the duration is 60 - 80 min. The decating duration of both the first decating tank and the second decating tank is 5 - 6 min.

[0025] The advantages and beneficial effects of the present invention are as follows:

[0026] The production method of the solid-color micro-velvet wool fabric is obtained by first dyeing and then scouring, which is different from the conventional step sequence of first scouring and then dyeing. The one-time success rate of solid-color dyeing is as high as 90%;

[0027] Compared with the wool fabric scoured first and then dyed, the probability of color streaks and color patches on the solid-color micro-velvet wool fabric is significantly reduced, the color difference between pieces is small, and the chromaticity consistency of solid colors is high;

[0028] The optimized production steps and process parameters are beneficial to reducing the color difference between the dyed fabric and the scoured fabric, improving the utilization rate of dyes in the whole fabric production process, and reducing the treatment difficulty of colored wastewater in the scouring process after dyeing;

[0029] The fabric has good shrinkage resistance, resilience and drapability, and good air permeability. Detailed implementation manners

[0030] The following combines examples to further describe the detailed implementation manners of the present invention. The following examples are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0031] In the description of this application, it should be noted that unless otherwise specified, "above" and "below" include the present number, "at least one" means "one or more", and the meaning of "multiple" is a combination of two and more than two.

[0032] The above application content of this application does not intend to describe each disclosed implementation manner or each implementation method in this application. The following description more specifically gives examples of exemplary implementation manners. Throughout the application, guidance is provided through a series of examples, which can be used in various combinations. In each example, the enumeration is only used as a representative group and should not be construed as exhaustive.

[0033] Examples

[0034] The production method of the solid-color micro-velvet wool fabric in Example 1 is as follows;

[0035] S1 Spinning: Using 100% Australian Merino fine wool as raw material, producing 60 / 2*60 / 2 double-strand yarn, with a twist of 670 / 950, and high-twist yarns in both positive and negative directions are combined;

[0036] S2 Weaving: Weaving on an imported dobby loom, the fabric parameters are a gram weight of 350 g / m 2 , warp density of 351 ends / 10 cm, weft density of 257 picks / 10 cm;

[0037] S3 Open-width scouring: Select an open-width scouring machine and adopt the high-temperature open-width scouring process. During scouring, the temperature is 82±2°C and the vehicle speed is 12 meters per minute. Add 1% of a neutral scouring aid during scouring to avoid damaging wool fibers with a strong alkaline component detergent.

[0038] S4 Rope scouring: Adopt a scouring method with pressure and scouring agent addition. Add a weak alkaline scouring agent, about 0.5 kg per piece. The scouring time is 20 min per piece, the rinsing time is 20 min per piece, and the water bath temperature is 45±2°C.

[0039] S5 Open-width scouring: The process parameters are the same as those of S3, and no scouring aid is added.

[0040] S6 Double boiling: The following cyclic steps are carried out in the first boiling trough and the second boiling trough: The fabric is wound around the boiling roller in the first boiling trough. After the fabric feeding is completed, boiling in the first boiling trough starts. After the boiling in the first boiling trough is completed, the fabric is reversed and wound around the boiling roller in the second boiling trough, and the inner and outer layers of the winding structure are exchanged. After the fabric feeding is completed, boiling in the second boiling trough starts until the boiling in the second boiling trough is completed. The boiling temperature is 80 - 90°C, and the duration is 60 - 80 min. The boiling duration of both the first boiling trough and the second boiling trough is 5 - 6 min. Soft water is selected and no additives are added.

[0041] S7 First steaming: Adopt an open-type steaming process, carried out under normal pressure. The steaming time is 6 min. After the fabric feeding is completed, turn on the steam switch. The steam pressure is 0.2 Mpa, and the fabric is cooled by suction and taken out in the last 1 minute.

[0042] S8 White fabric piece dyeing: Select acid dyes with similar properties, similar compatibility values, and similar dyeing conditions: Kelanda Yellow K-GLN, Kelanda Red K-GLN, Kelanda Grey K-BLN.

[0043] The composition of the piece dyeing solution includes 0.13% o.w.f of Kelanda Yellow K-GLN, 0.09% o.w.f of Kelanda Red K-GLN, 0.063% o.w.f of Kelanda Grey K-BLN, 0.5% o.w.f of a leveling agent, 6% o.w.f of the retarding agent sodium sulfate, 1% o.w.f of a penetration defoamer, and water. The dyeing solution is adjusted to a pH value of 5.5 with acetic acid. The dyeing conditions are as follows: The temperature (the highest temperature in stepwise heating) is 95±2°C, and the holding time is 60 min.

[0044] The piece dyeing solution is held at 40°C for 20 min for dye uptake, then rises to 65°C at a heating rate of 0.6°C / min, holds at 65±2°C for 20 min, then rises to 95±2°C again at a heating rate of 0.6°C / min, and finally cools and is rinsed with clear water.

[0045] S8 Brushing and Shearing: Use a drum - type brushing machine to comb the wool fibers neatly, making the fluff straighter, more uniform and in the same direction. After brushing, shear the wool. Use a three - blade shearing device with 2 forward blades and 1 reverse blade to shear the fluff on both sides of the fabric to 0.34 mm (the thickness of two pieces of kraft paper).

[0046] S9 Drying and Setting: First soak, then pad - dry. The padding pressure is 0.35 Mpa, and it is completed on a setting device. The drying and setting equipment has a total of 5 drying chambers. The temperature of the first chamber is 130 °C, and the temperatures of the subsequent four chambers are 150 °C;

[0047] S10 Second Decating: Adopt an open - type decating process, carried out under normal pressure. The decating time is 6 min. After the fabric feeding is completed, turn on the steam switch. The steam pressure is 0.2 Mpa, and then carry out cold - air extraction in the last 1 minute and take the fabric out of the machine;

[0048] S11 Scaling - off: Charge chlorine into the penetrant solution according to the mass - volume ratio of chlorine to penetrant solution of 6 g / L. Then continuously supplement chlorine into the penetrant solution to keep the mass - volume ratio of chlorine to penetrant solution at 6 ± 0.5 g / L. The concentration of penetrant Listril NGS in the penetrant solution is 1 g / L, and the fabric running speed is 10 m / min; The impregnation time of the fabric at the marked position with the scaling - off liquid is 25 ± 2 s;

[0049] The scaling - off process is to treat the fabric with normal - temperature chlorinated scaling - off liquid in the way of soaking plus spraying. After scaling - off, the fabric is successively washed with water for the first time, dechlorinated by reduction washing, and washed with water for the second time;

[0050] The dechlorination by reduction washing is carried out with a 1 g / L sodium metabisulfite solution at normal temperature.

[0051] S12 Washing: Use a drum - type washing equipment, completed in two steps. First, load the scaled - off fabric into the machine, add soda ash to adjust the pH to 7, control the temperature at about 50 °C, wash for 50 min and then rinse; Then add glacial acetic acid to adjust the pH to 6.5, rinse and take the fabric out of the machine, dehydrate and dry it

[0052] S13 Shearing: Shear the fabric to 0.45 mm according to the suede surface requirement of the finished product;

[0053] S14 Softening: Pad with a softener solution, the padding rate is 80%, single - trough, processed on a drying and setting combined machine. After padding, put it into the drying chamber to dry. According to the requirements of the finished product, adjust the width and overfeed, and unload the dried fabric;

[0054] S15 Third Decating: Adopt an open - type decating process, carried out under normal pressure. The loading amount each time is 2 pieces (about 125 meters), the decating time is 6 min. After the fabric feeding is completed, turn on the steam switch. The steam pressure is 0.2 Mpa, and then carry out cold - air extraction in the last 1 minute and take the fabric out of the machine, dry it to obtain the sample fabric.

[0055] Performance testing of the sample fabric:

[0056] 1. Detect the color fastness of the test specimen according to GB / T 3920-2024;

[0057] 2. Detect the soaping of the test specimen according to GB / T 3921-2008;

[0058] 3. Detect the hair soiling of the test specimen according to GB / T 3922-2013;

[0059] 4. Detect the pilling of the test specimen according to GB / T 4802.1-2008;

[0060] 5. Detect the breaking strength of the test specimen according to GB / T 3923.1-2013;

[0061] 6. Detect the dimensional change of the test specimen after steam ironing according to GB / T 38006-2019;

[0062] 7. The detection of chloride ions in the product after reduction dechlorination washing is carried out according to the following steps:

[0063] 8. The detection of chloride ions in the product after reduction dechlorination washing is carried out according to the following steps:

[0064] S01: Cut the fabric sample into pieces, take 5 ± 0.01 g of the cut fabric and 100 ml of distilled water, add them to a conical flask, place the conical flask in a constant temperature water bath at 40 ± 2 °C and shake and extract for 30 ± 2 min. After shaking, cool it in an environment at 20 ± 3 °C for 30 ± 2 min;

[0065] S02: Take 50 ml of distilled water into a beaker, titrate it with 0.05 mol / L silver nitrate solution on an automatic potentiometric titrator to obtain the volume V1 of silver nitrate consumed by the blank distilled water;

[0066] S03: Take 50 ml of the extraction solution from S01 into a beaker, titrate it with 0.05 mol / L silver nitrate solution on an automatic potentiometric titrator to obtain the volume V2 of silver nitrate consumed by the extraction solution;

[0067] S04: Calculate the chloride ion content in the textile based on the volume of silver nitrate consumed by the fabric extraction solution as V2 - V1.

[0068] Example 1 Fabric performance parameters and statistics of fabric color streaks and other defects (based on 1 bolt of fabric):

[0069] 1. The fabric style and basic performance are as follows:

[0070]

[0071] 2. The statistics of fabric color streaks and other defects and the one-time success rate of dyeing in the example are shown in the following table:

[0072]

[0073]

[0074] Based on the same fabrics, dyes, auxiliaries, equipment and consistent on-site operation specifications, the one-time success rate of dyeing refers to the ability to meet the predetermined quality standards in the first attempt during the dyeing process.

[0075] 3. The color measurement results of the fabric after dyeing in Example 1 (average value of 10 points, the same below) are: L 57.01; A 8.94; B 18.89. The color measurement results of the fabric after the third decatizing in Example 1 are: L 58.48; A 8.45; B 18.66;

[0076] 4. Fabric sensory evaluation: The visual appearance color of the fabric in Example 1 is bright, pure and consistent. The surface of the fabric has a delicate flannel feeling and a strong texture. The hand feeling is plump, smooth and waxy, and the smoothness is evenly distributed everywhere. There are no obvious blocky or stripy bright traces, indicating that the degree of scale peeling on the fabric surface is uniform;

[0077] 5. The shortest washing time for a single piece of fabric to reduce the chlorine ion content in the fabric to below 35 mg / kg by reduction dechlorination washing is 360 s.

[0078] Comparative Example

[0079] The process parameters of the comparative example are the same as those of Example 1, the difference lies in the process steps: open-width scouring → drying → rope scouring → open-width scouring → double boiling → decatizing → brushing and shearing → drying and setting → the first decatizing → scale peeling → dyeing → decatizing → shearing → softening → the second decatizing → finished product; the scale peeling liquid is acidic, which is consistent with the acidic system of dyeing. Therefore, only water washing is carried out between the scale peeling and dyeing steps, and no other cleaning steps are added; the scale peeling treatment itself will damage the scale layer, so the decatizing step between scale peeling and dyeing is omitted.

[0080] Statistics of defects such as color streaks on the fabric of the comparative example and the one-time success rate of dyeing are shown in the following table:

[0081] Defective variety Result Colored flower Calculated by vats, with 8 pieces dyed in each vat, occurrence probability ≥ 20% Color spot Calculated by piece, occurrence probability > 15%, number 6 - 12 Color difference between pieces Color difference grade 3 - 4 One-time success rate of dyeing Comprehensive evaluation 30% - 70%

[0082] Example 2

[0083] Example 2 is based on Example 1, the difference is that: the step of the second decatizing in S10 is omitted.

[0084] The color measurement results (average value of 10 points) of the test fabric in Example 2: L 57.65; A 8.77; B 18.73;

[0085] Sensory evaluation of fabrics: The visual appearance of the fabric of Example 2 has strip-shaped or block-shaped bright marks on the surface; the bright area feels too slippery and light in color, which is significantly different from the feel of the non-bright area, indicating that the degree of scaling on the bright area is higher, while the degree of scaling on the non-bright area is lower, that is, the degree of scaling on the fabric is unevenly distributed.

[0086] Example 3

[0087] Embodiment 3 is based on embodiment 1, and the difference is that: S8 brush shear adjusts the fluff shears on the front and back sides of the cloth to 0.68 mm.

[0088] Color measurement results of sample fabric (10-point average): L 57.94; A 8.64; B 18.68;

[0089] Sensory evaluation of fabrics: The visual appearance of the fabric of Example 3 has strip-shaped or block-shaped bright traces on the surface, and the area occupied by the bright part is much smaller than that of the fabric of Example 2; the difference in feel and color between the bright part and the non-bright part is consistent with the fabric of Example 2; but the descaling effect is better than that of Example 2.

[0090] Example 4

[0091] Example 4 is based on Example 1, with the difference that the sodium metabisulfite solution for reduction dechlorination washing also includes ethylene glycol, and the concentration of ethylene glycol is 5 g / L.

[0092] Example 4 Sample fabric color measurement results (10-point average): L 58.43; A 8.49; B 18.59, the shortest washing time for a single piece of fabric after reduction dechlorination washing until the chloride ion content in the fabric is less than 35 mg / kg is 375s;

[0093] Example 5

[0094] Example 5 is based on Example 1, with the difference that an ultrasonic device is provided in the washing liquid tank of the reduction dechlorination washing liquid (sodium metabisulfite solution), and the ultrasonic frequency is 50 kHz.

[0095] The color measurement results of the sample fabric of Example 5 (10-point average value) are: L 58.38; A 8.33; B 18.64. The shortest washing time for a single piece of fabric after reduction dechlorination washing until the chloride ion content in the fabric is less than 35 mg / kg is 290 s;

[0096] Example 6

[0097] Example 6 is based on Example 1, with the difference that an ultrasonic device is provided in the washing liquid tank of the reduction dechlorination washing liquid (the sodium metabisulfite solution also includes ethylene glycol, and the concentration of ethylene glycol is 5 g / L), and the ultrasonic frequency is 50 kHz.

[0098] Color measurement results of the sample fabric in Example 6 (average value of 10 points): L 58.20; A 8.44; B 18.67. The shortest washing time for a single piece of cloth to reduce and dechlorinate wash until the chloride ion content in the fabric reaches below 35 mg / kg is 286 s.

[0099] In Examples 4 - 6, the visual appearance color of the fabric is bright, pure and consistent; the smoothness of the fabric feels evenly distributed everywhere, without obvious blocky or stripy bright traces.

[0100] In Example 4, ethylene glycol was added to the sodium metabisulfite solution to perform reduction and dechlorination washing on the sample fabric. The increase in the L value is slightly smaller than that in Example 1, but the shortest washing time for a single piece increases. The possible reason is that the hydroxyl group of ethylene glycol forms hydrogen bonds with water, increasing the surface tension of the sodium metabisulfite solution and weakening the wetting ability of the sodium metabisulfite solution on the residual scales on the fiber surface, thereby reducing the decolorization amount of acid dye molecules in the wool fiber entering the sodium metabisulfite solution.

[0101] In Example 5, ultrasonic reduction and dechlorination washing was used. The cavitation effect of ultrasonic waves promoted the chlorine gas and chloride ions in the fiber pores and on the fabric surface generated from the residual scales to enter the sodium metabisulfite solution, greatly shortening the washing time, and the increase in the L value was smaller than that in Example 1.

[0102] In Example 6, ultrasonic reduction and dechlorination washing was performed using a sodium metabisulfite solution containing ethylene glycol. The shortest washing time for a single piece is equivalent to that in Example 5, but the increase in the L value is further reduced compared to Examples 4 and 5, indicating that the simultaneous action of ethylene glycol and ultrasonic waves further reduces the decolorization amount of acid dye in the reduction and dechlorination washing step, and further improves the dye utilization rate in the process of dyeing first and then desquamating.

[0103] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A production method of a plain micro-velvet wool fabric, characterized in that, It includes the following steps in sequence: scouring, drying, first steaming, piece dyeing, brushing and shearing, drying and setting, second steaming, scaly peeling, and water washing. The fibers of the plain micro-velvet wool fabric are Merino fine wool. The composition of the piece dyeing solution includes acid dyes, 0.2% o.w.f - 1% o.w.f leveling agent, 4% o.w.f - 9% o.w.f retarder sodium sulfate, 0.4% o.w.f - 3% o.w.f penetration and defoaming agent, and water; the pH value of the dyeing solution is 5 - 6; the dyeing conditions are a temperature of 90 - 98°C and a heat preservation time of 30 - 60 min.

2. The production method of the solid-color micro-suede wool fabric according to claim 1, characterized in that, The process of scaly peeling is to treat the fabric with normal-temperature chlorine scaly peeling solution in a wetting plus spraying manner. After scaly peeling, the fabric is successively washed with water for the first time, dechlorinated by reduction washing, and washed with water for the second time. The chlorine scaly peeling solution is prepared by initially charging and continuously supplementing chlorine gas into the penetrant solution. The composition of the chlorine scaly peeling solution includes: 4.5 - 8 g / L chlorine mass concentration, 0.5 - 2 g / L penetrant, and water. The fabric running speed is 8 - 10 m / min.

3. The production method of the plain micro suede wool fabric according to claim 1, characterized in that The piece dyeing solution is heat-preserved at 40 - 45°C for 10 - 20 min for dyeing uptake, then rises to 60 - 70°C at a heating rate of 0.35 - 0.9°C / min, and after heat preservation for 20 - 30 min, it rises to the dyeing condition temperature again at a heating rate of 0.35 - 0.9°C / min.

4. The production method of the plain micro-velvet wool fabric according to claim 1, characterized in that, The yarn of the wool fabric is a double-twist yarn with reverse and forward twists, and the reverse and forward twist degrees of the yarn are not less than 650 twists per meter. In the brushing and shearing step, the fluff on both sides of the fabric surface is cut to less than 0.5 mm.

5. The production method of the plain micro-velvet wool fabric according to claim 1, characterized in that, The first steaming and / or the second steaming is open-type atmospheric steaming, the steam pressure is 0.15 - 0.25 Mpa, and the steaming time is not more than 6 min.

6. The production method of the plain micro suede wool fabric according to claim 5, characterized in that, After water washing, it also includes the following steps in sequence: drying, shearing, softening, and third steaming. The process parameters of the third steaming are: open-type atmospheric steaming, the steam pressure is 0.15 - 0.25 Mpa, and the steaming time is not more than 6 min.

7. The production method of the plain micro-velvet wool fabric according to claim 1, characterized in that, Water washing includes the following steps in sequence: alkali washing and acid washing. Alkali washing is washing with a soda ash solution. The pH value of the soda ash solution is 7 - 8, the temperature is 40 - 50°C, and after alkali washing, it is rinsed with clear water. Acid washing is to add glacial acetic acid to the washing solution in the clear water rinsing step to adjust the pH value to 6 - 7, and then the fabric is taken out of the machine and dried.

8. The production method of the plain micro-velvet wool fabric according to claim 1, characterized in that, Drying and setting is to wet the wool fabric with a sizing machine, then roll the liquid and dry it. The rolling pressure is 0.32 - 0.4 Mpa. The drying is carried out in two stages. The drying temperature in the first stage is 130 - 140°C, and the drying temperature in the second stage is 145 - 155°C.

9. The production method of the solid-color micro-suede wool fabric according to claim 2, characterized in that, The washing solution for the dechlorination by reduction washing is a sodium metabisulfite solution, and the concentration of the sodium metabisulfite solution is 0.7 - 1.5 g / L.

10. The production method of the solid-color micro-suede wool fabric according to claim 1, characterized in that, The scouring includes the following steps in sequence: open-width scouring, drying, rope scouring, open-width scouring, and double boiling. The double boiling includes the following cyclic steps: The fabric is wound around the boiling roller in the first boiling tank. After the fabric feeding is completed, the boiling in the first boiling tank starts. After the boiling in the first boiling tank is completed, the fabric is reversed and wound around the boiling roller in the second boiling tank, and the inner and outer layers of the winding structure are exchanged. After the fabric feeding is completed, the boiling in the second boiling tank starts until the boiling in the second boiling tank is completed. The fulling temperature is 80 - 90 °C, and the duration is 60 - 80 min. The fulling duration of the first fulling trough and the second fulling trough is 5 - 6 min each.

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