Yak hair / yak wool embedded composite spinning process

Abstract

The invention discloses a yak hair / yak wool embedded type composite spinning technology. The technology comprises the following steps that yak hair rough yarn is prepared; preparing yakwool roving; an embedded composite spinning device is adopted for spinning, the yak hair rough yarn is arranged on the inner side of the first PVA filament, and the yak wool rough yarn is located on the inner side of the second PVA filament; pre-twisting the yak hair roving and the first PVA filament to form a first pre-twisted strand; pre-twisting the yakwool roving and the second PVA filament to form a second pre-twisted strand; and the first pre-twisted fiber strand and the second pre-twisted fiber strand are twisted at the junction C to form the yarn. And an embedded composite spinning mode is adopted, so that the prepared composite yarn is uniform in evenness and less in hairiness. And the used PVA filaments have the effect of being dissolved in hot water, so that the prepared composite yarn has a hollow and fluffy structure after being subjected to hot water treatment, and the heat retention property is good.

Description

Technical Field

[0001] The invention relates to a yak hair / yak wool embedded composite spinning process, belonging to the technical field of embedded spinning processes. Background Art

[0002] While wool and cashmere yarn spinning is relatively mature, yak wool products have also recently emerged on the market. Yaks are a unique breed of cattle native to alpine grasslands, bred in high-altitude regions exceeding 3,000 meters above sea level. They have a rich, long coat, with a downy undercoat. Due to their long-term high-altitude climate, yak wool offers excellent warmth and a distinctive style.

[0003] Yak wool fabrics are made from yarn woven from yak wool. Yaks are a breed native to the alpine grasslands of China's Qinghai-Tibet Plateau and adjacent areas. They are adapted to altitudes of 3,200-4,800 meters and can withstand temperatures as low as -30-40 degrees Celsius. In winter, they grow a dense, thick down on the underside of their chests, which naturally sheds as temperatures rise. The wool is harvested annually, starting around May or June, by hand-pulling. Adult yaks produce 1.17-2.62 kg of wool annually, while young yaks produce 1.30-1.35 kg, with a half-weight split between coarse hair and down. Yak wool is very fine, with a diameter of less than 20 microns and a length of 3.4-4.5 cm. It has irregular curves and tightly interlocking scales. It has a soft luster, strong elasticity, and a smooth, waxy feel. The yak's habitat gives it exceptional warmth, making it extremely cold-resistant and fluffy. Yak wool fiber is 1.5 times stronger than cashmere, making it more resistant to pilling and maintaining dimensional stability after washing. Yak wool fabrics have recently been widely used in clothing, offering warmth and comfort comparable to cashmere. Yak wool is over 20 cm long, has an average strength of approximately 70.6 cN / tex, is straight and smooth, and some have a continuous medulla, resulting in a tough, lustrous feel. However, it has low felting shrinkage. Yak wool production is relatively low, with the production of yak wool exceeding that of yak down. Blending yak wool with yak wool is difficult due to the significant correlation between the properties of wool and cashmere, making it difficult to form blended yarns.

[0004] Professor Xu Weilin of Wuhan Textile University, patent number 200810246351.5, "An Embedded System Positioning Spinning Method," discloses a method for spinning multi-component composite yarns with varying structures by combining two short-fiber rovings and two filaments unwound from a roving bobbin on a ring spinning frame, depending on the relative positions and fiber types. The challenge was to produce yak hair and yak cashmere composite yarns using the embedded spinning process. Summary of the Invention

[0005] The invention aims to provide a yak hair / yak down embedded composite spinning process, which can prepare composite yarn with less hairiness and uniform yarn length.

[0006] In order to solve the above-mentioned technical problems, the purpose of the present invention is achieved as follows:

[0007] The present invention relates to a yak hair / yak wool embedded composite spinning process, comprising the following steps:

[0008] S1. Preparation of yak hair roving: yak hair roving is prepared from yak hair, with a basis weight of 8-12 g / 10 m;

[0009] S2. Preparation of yak wool roving: yak wool is prepared into yak wool roving with a basis weight of 8-12 g / 10 m;

[0010] S3, embedded composite spinning: using embedded composite spinning equipment for spinning, the first PVA filament and the second PVA filament are symmetrically arranged on the outside, the yak wool roving is arranged on the inside of the first PVA filament, and the yak wool roving is arranged on the inside of the second PVA filament;

[0011] The yak wool roving is pre-twisted with the first PVA filament to form a first pre-twisted whisker; the yak wool roving is pre-twisted with the second PVA filament to form a second pre-twisted whisker;

[0012] The first pre-twisted strands and the second pre-twisted strands are twisted into yarn at a converging point C;

[0013] The distance between the yak wool wool and the first PVA filament is 2-4 mm, the distance between the first PVA filament and the second PVA filament is 14-20 mm, and the pre-tension is 1.8-2.0 cN;

[0014] The drafting ratio of the rear zone is 1.25-1.30, and the ratio of the pre-twist degree of the first pre-twisted strand and the second pre-twisted strand to the twist degree of the yarn is 1:3-5.

[0015] On the basis of the above solution and as a preferred solution of the above solution: the preparation of the yak hair roving comprises the following steps:

[0016] S1-1. Classification and impurity removal: The raw wool is classified according to length and roughness, and a centrifugal dust collector is used to remove sand, dirt, and grass burrs. The impurity content is controlled to less than 3%.

[0017] S1-2, washing and degreasing: first soak the yak hair with clean water for 8-15 minutes, take it out and wash it with detergent, then soak it with alkaline protease at a pH range of 9-10, a temperature of 45-50°C, and ultrasonic conditions of 23-39kHz for 10-20 minutes, then take it out and wash it with clean water at 40-50°C;

[0018] S1-3, softening treatment: soak the degreased yak hair in a softener solution for 10-20 minutes, take it out and place it in an environment of 60-65°C and 80-85% relative humidity for 3-4 hours, and then dry it;

[0019] S1-4, pickling: placing the yak hair treated in the previous step in a pickling tank containing a pickling solution, treating at 55-60°C for 10-15 minutes, then taking it out and rinsing and pressing it dry; the pickling solution contains 5-7.5wt% sulfuric acid;

[0020] S1-5, carbonization: drying the yak hair treated in the previous step, and then drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized, and then rolling and dusting are performed to separate the carbonized grass impurities from the yak hair;

[0021] S1-6, pre-opening: pre-opening the yak hair processed in the previous step;

[0022] S1-7, blending and oiling: Spraying the pre-opened yak hair with a blending emulsion, blending the hair two to three times, and then packing and curing for 24-36 hours; the blending emulsion is used in an amount of 6-8% by weight of the yak hair, and the moisture regain of the yak hair during blending is controlled at 24-30%; the blending emulsion comprises blending oil, an emulsifier, and water;

[0023] S1-8, Combing: Use a three-cylinder two-combination combing machine to comb the fibers to make them straight and parallel single fibers. The combed fibers are made into a wool net, which is then made into small wool strips. The small wool strips are twisted and wound into several coarse yarn cakes.

[0024] On the basis of the above solution and as a preferred solution of the above solution: the preparation of the yak wool roving comprises the following steps:

[0025] S2-1, Sorting: Pick out the hard-to-open felt pieces and the obviously clumped coarse dead hair from the yak wool, and select the yak wool for combing;

[0026] S2-2, opening: using a vertical cotton opener and a drum cotton opener to open the yak wool sorted in the previous step;

[0027] S2-3, cleaning: Place the opened yak wool in a water tank for cleaning to remove dirt and impurities, and press dry;

[0028] S2-4, Removal of oily sweat: Place the cleaned yak wool in a sink containing soft water, add 5-8 wt% detergent and 1-2 wt% builder to the soft water, and treat it under 23-39 kHz ultrasonic waves at 55-60°C for 10-20 minutes, and then wash with soft water and press dry;

[0029] S2-5, drying: drying the yak wool treated in the previous step in an oven to a moisture regain of 14-17% at a temperature of 80-85°C;

[0030] S2-6, pickling: placing the yak wool treated in the previous step in a pickling tank containing a pickling solution, treating at 55-60°C for 10-15 minutes, taking it out, rinsing it, and pressing it dry; the pickling solution contains 5-7.5wt% sulfuric acid;

[0031] S2-7, carbonization: drying the yak wool treated in the previous step, and then drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized;

[0032] S2-8, rolling and opening: the dried yak wool is rolled and opened multiple times, and the rolled and opened yak wool is dusted to separate the carbonized grass impurities from the yak wool;

[0033] S2-9, pre-opening: pre-opening the yak wool processed in the previous step;

[0034] S2-10, wool blending: Spraying the pre-opened yak wool with a wool blending emulsion consisting of wool blending oil and water, blending the wool twice, and then packing and curing for 24-36 hours; the wool blending emulsion contains 0.2-0.5wt% wool blending oil, and the moisture regain of the yak wool during the blending is controlled at 24-30%;

[0035] S2-11, combing and removing coarse wool: combing the yak wool after mixing with the down by using a licker-in flat combined with a carding machine to prepare a hair-free velvet, wherein the coarse wool content of the hair-free velvet is not higher than 2.5%;

[0036] S2-12, Mixing and oiling: Loosen and mix the yak wool and wool according to the set ratio, spray with oil, pour into the bin, mix and oil for two to three times, then pack and store for more than 12 hours;

[0037] S2-13, carding: carding the mixed yak wool with a carding machine, and then making it into a fixed amount of coarse yarn;

[0038] The speed of the cylinder is 330-360rpm, the speed of the licker-in is 350-450rpm, the sliver delivery speed is 80-100m / min, and the card sliver weight is 18-20g / 5m;

[0039] The gauge between the licker-in and the feed plate is 0.15-0.20 mm, the gauge between the licker-in and the cylinder is 0.10-0.15 mm, the gauge between the cylinder and the doffer is 0.08-0.12 mm, the gauge between the cylinder and the cover at the entrance is 0.18-0.25 mm, and the gauge between the cylinder and the cover at the exit is 0.12-0.18 mm;

[0040] S2-14 draw bar adopts three-pass draw bar, including first draw bar, second draw bar and last draw bar, with the draw bar numbers of 6, 8 and 8 respectively, the total drafting ratios of 6.5, 7.5 and 7.8 respectively, and the sliver weight is 3-3.5g / 5m;

[0041] S2-15, roving: spindle speed 800 rpm, twist coefficient 380, axial winding density 3.2 turns / cm;.

[0042] On the basis of the above scheme and as a preferred scheme of the above scheme: the crude oil includes quaternary ammonium salt of terminal amino hyperbranched compound, cross-linked hyperbranched water-based polyurethane acrylate, Taiko oil, sodium fatty alcohol polyvinyl ether sulfate, soybean oil fatty acid methyl ester, octadecyl phosphate, hydroxyl-modified amino silicone oil and deionized water.

[0043] On the basis of the above scheme and as a preferred scheme of the above scheme: Step S2-13 uses the metal card cloth used in the cylinder of the carding machine with a needle tooth density of 460-500 points / inch 2 The card cloth includes a base and needle teeth, the tooth tip hardness is ≥780HV, the tooth tip includes a first arc segment, a straight segment and a second arc segment, the radius of the first arc segment is 0.05mm, the radius of the second arc segment is 0.1mm, and the angle of the front tooth surface is 55-60°, and the angle of the rear tooth surface is 30-35°;

[0044] The doffer card wire has an eagle-beak-shaped tooth tip and a negative rake angle of -5° to -8°.

[0045] The present invention has the following beneficial effects: the yak wool / yak wool embedded composite spinning process employs an embedded composite spinning method, resulting in a composite yarn with uniform yarn length and reduced hairiness. Furthermore, the PVA filaments used are water-soluble, resulting in a hollow and fluffy composite yarn after hot water treatment, thus providing excellent warmth retention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of the yak hair / yak wool embedded composite yarn process involved in the present invention;

[0047] Figure 2 Schematic diagram of the structure of the needle teeth on the metal card cloth used in the cylinder of the carding machine of the present invention;

[0048] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0049] The markings in the figure are as follows: 1-yak hair roving; 2-yak wool roving; 3-first PVA filament; 4-second PVA filament; 5-first pre-twisted whisker; 6-second pre-twisted whisker; 7-composite yarn; A1-A2 are the front roller jaw lines; C is the meeting point; 11-base; 12-needle teeth; 121-first arc segment; 122-straight segment; 123-second arc segment; 124-front tooth surface; 125-back tooth surface. DETAILED DESCRIPTION

[0050] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0051] Example 1

[0052] Combine Figure 1 , this embodiment is described in detail. The yak hair / yak wool embedded composite spinning process involved in this embodiment includes the following steps:

[0053] S1. Preparation of yak hair roving: yak hair roving is prepared from yak hair, with a basis weight of 12 g / 10 m.

[0054] S2. Preparation of yak wool roving: yak wool is prepared into yak wool roving with a basis weight of 12 g / 10 m.

[0055] S3. Embedded composite spinning: Embedded composite spinning equipment is used for spinning. The first PVA filament 3 and the second PVA filament 4 are symmetrically arranged on the outside. The yak wool roving 1 is placed inside the first PVA filament 3, and the yak wool roving 2 is placed inside the second PVA filament 4. The yak wool roving 1 and the first PVA filament 3 are pre-twisted to form a first pre-twisted whisker 5. The yak wool roving 2 and the second PVA filament are pre-twisted to form a second pre-twisted whisker 6. The first pre-twisted whisker 5 and the second pre-twisted whisker 6 are twisted together at a confluence point C to form a yarn. The spacing between the yak wool roving 1 and the first PVA filament 3 is 2 mm, and the spacing between the first PVA filament 3 and the second PVA filament 4 is 14 mm. The pre-twisted tension is 2.0 cN. The back-zone draft is 1.25, and the ratio of the pre-twist degree of the first pre-twisted whisker 5 and the second pre-twisted whisker 6 to the twist degree of the finished yarn is 1:3. The fineness of the PVA filaments used in the first PVA filaments 3 and the second PVA filaments 4 is 4.2 tex, and the fineness of the prepared composite yarn 7 is 10.75 tex×2.

[0056] Furthermore, the preparation of the yak hair roving includes the following steps:

[0057] S1-1. Grading and impurity removal: The raw wool is classified according to length and roughness content, and a centrifugal dust collector is used to remove sand, dirt and grass thorns. The impurity content is controlled to less than 3%.

[0058] S1-2, washing and degreasing: first soak the yak hair with clean water for 15 minutes, take it out and wash it with detergent, then use alkaline protease to immerse it in the pH range of 9, temperature of 50°C and 23kHz ultrasonic conditions for 20 minutes, then take it out and wash it with clean water at 40°C.

[0059] S1-3, softening treatment: soak the degreased yak hair in a softener solution for 20 minutes, take it out and place it in an environment of 60° C. and 85% relative humidity for 3 hours, and then dry it; the softener solution includes 3 wt % of sodium sulfate.

[0060] S1-4, pickling: placing the yak hair treated in the previous step into a pickling tank containing a pickling solution, treating at 60° C. for 10 minutes, taking out, rinsing, and pressing dry; the pickling solution contains 7.5 wt % sulfuric acid.

[0061] S1-5, carbonization: drying the yak hair treated in the previous step, and drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized, and then crushed and dusted to separate the carbonized grass impurities from the yak hair.

[0062] S1-6, pre-opening: pre-opening the yak hair processed in the previous step.

[0063] S1-7, wool blending and oiling: Spread the pre-loosened yak hair and spray the wool blending emulsion on it, blend it two to three times, and pack it for curing for 36 hours; the amount of wool blending emulsion used is 6% of the weight of the yak hair, and the moisture regain of the yak hair during blending is controlled at 30%; the wool blending emulsion includes wool blending oil, emulsifier and water.

[0064] S1-8, Combing: Use a three-cylinder two-combination combing machine to comb the fibers to make them straight and parallel single fibers. The combed fibers are made into a wool net, which is then made into small wool strips. The small wool strips are twisted and wound into several coarse yarn cakes.

[0065] Furthermore, the preparation of the yak wool roving includes the following steps:

[0066] S2-1. Sorting: Pick out the hard-to-open felt pieces and the obviously clumped coarse dead hair from the yak wool, and select the yak wool for combing.

[0067] S2-2, opening: using a vertical cotton opener and a drum cotton opener to open the yak wool sorted in the previous step.

[0068] S2-3, cleaning: Place the opened yak wool in a water tank for cleaning, remove dirt and impurities, and press dry.

[0069] S2-4. Removal of oily sweat: Place the cleaned yak wool in a sink containing soft water, add 8 wt% detergent and 1 wt% builder into the soft water, treat under 39 kHz ultrasonic wave and 55°C for 10 min, and then wash with soft water and squeeze dry.

[0070] Furthermore, the detergent includes 5 parts by mass of sodium stearyl sulfate, 3 parts by mass of fatty alcohol polyoxyethylene ether, sodium laureth-9 sulfate, 5 parts by mass of dodecylamide ethyl ester sulfosuccinate disodium salt, 8 parts by mass of diethylene glycol bismaleic acid dodecyl monoethanolamine diester sodium sulfonate, 10 parts by mass of sodium dodecylbenzenesulfonate, 2 parts by mass of coconut oil diethanolamine, 3 parts by mass of octylphenol polyoxyethylene ether and 100 parts by mass of deionized water.

[0071] S2-5, drying: drying the yak wool treated in the previous step in an oven to a moisture regain of 14% at a temperature of 85°C.

[0072] S2-6, pickling: placing the yak wool treated in the previous step into a pickling tank containing a pickling solution, treating at 60° C. for 10 minutes, taking it out, rinsing it, and pressing it dry; the pickling solution contains 7.5 wt % sulfuric acid.

[0073] S2-7, carbonization: drying the yak wool processed in the previous step, and drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized.

[0074] S2-8, rolling and opening: the dried yak wool is rolled and opened multiple times, and the rolled and opened yak wool is dusted to separate the carbonized grass impurities from the yak wool.

[0075] S2-9, pre-opening: pre-opening the yak wool processed in the previous step.

[0076] S2-10, wool blending: Spread the pre-opened yak wool and spray a wool blending emulsion consisting of wool blending oil and water, blend the wool twice, and pack and cure for 24-36 hours; the wool blending emulsion contains 0.2-0.5wt% wool blending oil, and the moisture regain of the yak wool during blending is controlled at 24-30%.

[0077] S2-11, combing and removing coarse fibers: combing the yak wool after mixing with the down by using a licker-in roller and a flat plate combined with a carding machine to prepare hair-free down, wherein the coarse fiber content of the hair-free down is not higher than 2.5%.

[0078] S2-12, mixing and oiling: Loosen and mix the yak down and wool according to the set ratio, spray the wool oil, pour the bin, mix the down and oil two to three times, and then pack and keep it in a sealed place for more than 12 hours.

[0079] S2-13, Carding: The mixed yak wool is carded using a carding machine and then formed into slivers of fixed weight. The cylinder speed is 360 rpm, the licker-in speed is 350 rpm, the sliver delivery speed is 100 m / min, and the carded sliver weight is 18 g / 5 m. The gauges between the licker-in and the feed plate are 0.20 mm, 0.10 mm, and 0.08 mm, respectively. The gauges between the cylinder and the cover plate at the inlet are 0.25 mm, and 0.12 mm at the outlet.

[0080] S2-14 drawing adopts three-pass drawing including first drawing, second drawing and last drawing. The drawing numbers are 6, 8 and 8 respectively. The total drafting multiples are 6.5, 7.5 and 7.8 respectively. The weight of the finished sliver is 3.5g / 5m.

[0081] S2-15, roving: spindle speed 800 rpm, twist coefficient 380, axial winding density 3.2 turns / cm.

[0082] Furthermore, the crude oil includes quaternary ammonium salt of terminal amino hyperbranched compound, cross-linked hyperbranched water-based polyurethane acrylate, Taiko oil, sodium fatty alcohol polyvinyl ether sulfate, soybean oil fatty acid methyl ester, octadecyl phosphate, hydroxyl-modified amino silicone oil and deionized water.

[0083] Furthermore, the crude oil includes 5 parts by mass of a quaternary ammonium salt of a terminal amino hyperbranched compound, 8 parts by mass of a cross-linked hyperbranched waterborne polyurethane acrylate, 3 parts by mass of Taiko oil, 5 parts by mass of sodium fatty alcohol polyvinyl ether sulfate, 6 parts by mass of soybean oil fatty acid methyl ester, 10 parts by mass of octadecyl phosphate, 8 parts by mass of a hydroxyl-modified amino silicone oil and 100 parts by mass of deionized water.

[0084] Furthermore, in step S2-13, the metal card cloth used in the cylinder of the carding machine has a tooth density of 500 points / inch. 2 The card clothing includes a base 11 and needle teeth 12, the tooth tip hardness is ≥780HV, the tooth tip includes a first arc segment 121, a straight segment 122 and a second arc segment 123, the radius of the first arc segment 121 is 0.05mm, the radius of the second arc segment 123 is 0.1mm, and the angle of the front tooth surface 124 is 55°, and the angle of the rear tooth surface 125 is 30°; the doffer card clothing uses an eagle-beak-shaped tooth tip with a negative rake angle of -5°.

[0085] Example 2

[0086] Combine Figure 1 , this embodiment is described in detail. The yak hair / yak wool embedded composite spinning process involved in this embodiment includes the following steps:

[0087] S1. Preparation of yak hair roving: yak hair roving is prepared from yak hair, with a basis weight of 12 g / 10 m.

[0088] S2. Preparation of yak wool roving: yak wool is prepared into yak wool roving with a basis weight of 12 g / 10 m.

[0089] S3. Embedded composite spinning: Embedded composite spinning equipment is used for spinning. The first PVA filament 3 and the second PVA filament 4 are symmetrically arranged on the outside. The yak wool roving 1 is placed inside the first PVA filament 3, and the yak wool roving 2 is placed inside the second PVA filament 4. The yak wool roving 1 and the first PVA filament 3 are pre-twisted to form a first pre-twisted whisker 5. The yak wool roving 2 and the second PVA filament are pre-twisted to form a second pre-twisted whisker 6. The first pre-twisted whisker 5 and the second pre-twisted whisker 6 are twisted together at a confluence point C to form a yarn. The spacing between the yak wool roving 1 and the first PVA filament 3 is 4 mm, and the spacing between the first PVA filament 3 and the second PVA filament 4 is 20 mm. The pre-twisted tension is 1.8 cN. The back-zone draft is 1.30, and the ratio of the pre-twist degree of the first pre-twisted whisker 5 and the second pre-twisted whisker 6 to the twist degree of the finished yarn is 1:5. The fineness of the PVA filaments used in the first PVA filaments 3 and the second PVA filaments 4 is 4.2 tex, and the fineness of the prepared composite yarn 7 is 8.5 tex×2.

[0090] Furthermore, the preparation of the yak hair roving includes the following steps:

[0091] S1-1. Grading and impurity removal: The raw wool is classified according to length and roughness content, and a centrifugal dust collector is used to remove sand, dirt and grass thorns. The impurity content is controlled to less than 3%.

[0092] S1-2, washing and degreasing: first soak the yak hair with clean water for 8 minutes, take it out and wash it with detergent, then take it out and soak it with alkaline protease at a pH range of 10, a temperature of 45°C and 39kHz ultrasonic conditions for 10 minutes, then take it out and wash it with clean water at 50°C.

[0093] S1-3, softening treatment: soak the degreased yak hair in a softener solution for 10 minutes, take it out and place it in an environment of 65° C. and 80% relative humidity for 4 hours, and then dry it; the softener solution includes 5wt% sodium sulfate.

[0094] S1-4, pickling: placing the yak hair treated in the previous step into a pickling tank containing a pickling solution, treating at 55° C. for 15 minutes, taking out, rinsing, and pressing dry; the pickling solution includes 5 wt % sulfuric acid.

[0095] S1-5, carbonization: drying the yak hair treated in the previous step, and drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized, and then crushed and dusted to separate the carbonized grass impurities from the yak hair.

[0096] S1-6, pre-opening: pre-opening the yak hair processed in the previous step.

[0097] S1-7, wool blending and oiling: Spread the pre-loosened yak hair and spray the wool blending emulsion on it, blend it two to three times, and pack it for curing for 24 hours; the amount of wool blending emulsion used is 8% of the weight of the yak hair, and the moisture regain of the yak hair during blending is controlled at 24%; the wool blending emulsion includes wool blending oil, emulsifier and water.

[0098] S1-8, Combing: Use a three-cylinder two-combination combing machine to comb the fibers to make them straight and parallel single fibers. The combed fibers are made into a wool net, which is then made into small wool strips. The small wool strips are twisted and wound into several coarse yarn cakes.

[0099] Furthermore, the preparation of the yak wool roving includes the following steps:

[0100] S2-1. Sorting: Pick out the hard-to-open felt pieces and the obviously clumped coarse dead hair from the yak wool, and select the yak wool for combing.

[0101] S2-2, opening: using a vertical cotton opener and a drum cotton opener to open the yak wool sorted in the previous step.

[0102] S2-3, cleaning: Place the opened yak wool in a water tank for cleaning, remove dirt and impurities, and press dry.

[0103] S2-4. Removal of oily sweat: Place the cleaned yak wool in a sink containing soft water, add 5 wt% detergent and 2 wt% builder into the soft water, treat under 23 kHz ultrasonic wave and 60°C for 20 min, and then wash with soft water and press dry.

[0104] Furthermore, the detergent includes 10 parts by mass of sodium stearyl sulfate, 5 parts by mass of fatty alcohol polyoxyethylene ether, sodium laureth-9 sulfate, 2 parts by mass of dodecylamide ethyl ester sulfosuccinate disodium salt, 3 parts by mass of diethylene glycol bismaleic acid dodecyl monoethanolamine diester sodium sulfonate, 5 parts by mass of sodium dodecylbenzenesulfonate, 3 parts by mass of coconut oil diethanolamine, 5 parts by mass of octylphenol polyoxyethylene ether and 100 parts by mass of deionized water.

[0105] S2-5, drying: drying the yak wool treated in the previous step in an oven to a moisture regain of 17% at a temperature of 80°C.

[0106] S2-6, pickling: placing the yak wool treated in the previous step into a pickling tank containing a pickling solution, treating at 55° C. for 15 minutes, taking it out, rinsing it, and pressing it dry; the pickling solution contains 7.5 wt % sulfuric acid.

[0107] S2-7, carbonization: drying the yak wool processed in the previous step, and drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized.

[0108] S2-8, rolling and opening: the dried yak wool is rolled and opened multiple times, and the rolled and opened yak wool is dusted to separate the carbonized grass impurities from the yak wool.

[0109] S2-9, pre-opening: pre-opening the yak wool processed in the previous step.

[0110] S2-10, wool blending: Spread the pre-opened yak wool and spray a wool blending emulsion consisting of wool blending oil and water, blend the wool twice, and pack and cure for 24-36 hours; the wool blending emulsion contains 0.2-0.5wt% wool blending oil, and the moisture regain of the yak wool during blending is controlled at 24-30%.

[0111] S2-11, combing and removing coarse fibers: combing the yak wool after mixing with the down by using a licker-in roller and a flat plate combined with a carding machine to prepare hair-free down, wherein the coarse fiber content of the hair-free down is not higher than 2.5%.

[0112] S2-12, mixing and oiling: Loosen and mix the yak down and wool according to the set ratio, spray the wool oil, pour the bin, mix the down and oil two to three times, and then pack and keep it in a sealed place for more than 12 hours.

[0113] S2-13, Carding: The mixed yak wool is carded using a carding machine and then formed into slivers of fixed weight. The cylinder speed is 330 rpm, the licker-in speed is 450 rpm, the sliver delivery speed is 80 m / min, and the carded sliver basis weight is 18 g / 5 m. The gauges between the licker-in and the feed plate are 0.20 mm, 0.10 mm, and 0.12 mm, respectively. The gauges between the cylinder and the cover plate at the inlet and outlet are 0.18 mm and 0.18 mm, respectively.

[0114] S2-14 drawing adopts three-pass drawing including first drawing, second drawing and last drawing. The drawing numbers are 6, 8 and 8 respectively. The total drafting multiples are 6.5, 7.5 and 7.8 respectively. The weight of the finished sliver is 3.5g / 5m.

[0115] S2-15, roving: spindle speed 800 rpm, twist coefficient 380, axial winding density 3.2 turns / cm.

[0116] Furthermore, the crude oil includes quaternary ammonium salt of terminal amino hyperbranched compound, cross-linked hyperbranched water-based polyurethane acrylate, Taiko oil, sodium fatty alcohol polyvinyl ether sulfate, soybean oil fatty acid methyl ester, octadecyl phosphate, hydroxyl-modified amino silicone oil and deionized water.

[0117] Furthermore, the crude oil includes 5 parts by mass of a quaternary ammonium salt of a terminal amino hyperbranched compound, 8 parts by mass of a cross-linked hyperbranched waterborne polyurethane acrylate, 3 parts by mass of Taiko oil, 5 parts by mass of sodium fatty alcohol polyvinyl ether sulfate, 6 parts by mass of soybean oil fatty acid methyl ester, 10 parts by mass of octadecyl phosphate, 8 parts by mass of a hydroxyl-modified amino silicone oil and 100 parts by mass of deionized water.

[0118] Furthermore, in step S2-13, the metal card cloth used in the cylinder of the carding machine has a needle tooth density of 460 points / inch. 2 The card clothing includes a base 11 and needle teeth 12, the tooth tip hardness is ≥780HV, the tooth tip includes a first arc segment 121, a straight segment 122 and a second arc segment 123, the radius of the first arc segment 121 is 0.05mm, the radius of the second arc segment 123 is 0.1mm, and the angle of the front tooth surface 124 is 60°, and the angle of the rear tooth surface 125 is 35°; the doffer card clothing uses an eagle-beak-shaped tooth tip with a negative rake angle of -8°.

[0119] The CV (%) of the yak hair / yak wool composite yarn prepared in Example 1 and Example 2 were 9.97 and 9.85, respectively, while the CV (%) of the conventional yak wool yarn with a fineness of 11.8 tex×2 was 16.54.

[0120] The hairiness index of the yak hair / yak wool composite yarn prepared in Example 1 and Example 2 and the conventional yak wool yarn with a fineness of 11.8 tex×2 was tested, and the results were as follows:

[0121] Hairiness index Example 1 Example 2 Comparative Example 1mm 150.5 143.5 180.5 2mm 25.6 28.4 40.6 3mm 5.6 7.4 12.3 4mm 1.2 1.8 4.2 5mm 0.3 0.8 2.1 6mm 0.1 0.6 1.3 7mm 0.08 0.16 0.34 8mm 0.08 0.14 0.25 9mm 0.08 0.12 0.19

[0122] The yak hair / yak wool composite yarn prepared in Example 1 and Example 2 was used to prepare a woven fabric according to a plain weave with a gram weight of 180 grams per square meter. The wool worsted yarn was used to prepare a woven fabric according to a plain weave with a gram weight of 182 grams per square meter. The thermal conductivity coefficients were tested, and the test results were 0.086, 0.092 W / (m·k), and 0.112 W / (m·k), respectively, which showed excellent thermal insulation properties.

[0123] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A yak hair / yak wool embedded composite spinning process, characterized in that: The steps include: S1. Preparation of yak hair roving: yak hair roving is prepared from yak hair, with a basis weight of 8-12 g / 10 m; S2. Preparation of yak wool roving: yak wool is prepared into yak wool roving with a basis weight of 8-12 g / 10 m; S3, embedded composite spinning: using embedded composite spinning equipment for spinning, the first PVA filament (3) and the second PVA filament (4) are symmetrically arranged on the outside, the yak wool roving (1) is arranged on the inside of the first PVA filament (3), and the yak wool roving (2) is located on the inside of the second PVA filament (4); The yak wool roving (1) is pre-twisted with the first PVA filament (3) to form a first pre-twisted whisker (5); the yak wool roving (2) is pre-twisted with the second PVA filament to form a second pre-twisted whisker (6); The first pre-twisted strand (5) and the second pre-twisted strand (6) are twisted into yarn at a converging point (C); The distance between the yak hair roving (1) and the first PVA filament (3) is 2-4 mm, the distance between the first PVA filament (3) and the second PVA filament (4) is 14-20 mm, and the pre-tension is 1.8-2.0 cN; The drafting ratio in the rear zone is 1.25-1.30, and the ratio of the pre-twisting degree of the first pre-twisted strand (5) and the second pre-twisted strand (6) to the twist degree of the yarn is 1:3-5.

2. The yak hair / yak wool embedded composite spinning process according to claim 1, characterized in that: The preparation of the yak hair roving comprises the following steps: S1-1. Classification and impurity removal: The raw wool is classified according to length and roughness, and a centrifugal dust collector is used to remove sand, dirt, and grass burrs. The impurity content is controlled to less than 3%. S1-2, washing and degreasing: first soak the yak hair with clean water for 8-15 minutes, take it out and wash it with detergent, then soak it with alkaline protease at a pH range of 9-10, a temperature of 45-50°C, and ultrasonic conditions of 23-39kHz for 10-20 minutes, then take it out and wash it with clean water at 40-50°C; S1-3, softening treatment: soak the degreased yak hair in a softener solution for 10-20 minutes, take it out and place it in an environment of 60-65°C and 80-85% relative humidity for 3-4 hours, and then dry it; S1-4, pickling: placing the yak hair treated in the previous step in a pickling tank containing a pickling solution, treating at 55-60°C for 10-15 minutes, then taking it out and rinsing and pressing it dry; the pickling solution contains 5-7.5wt% sulfuric acid; S1-5, carbonization: drying the yak hair treated in the previous step, and then drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized, and then rolling and dusting are performed to separate the carbonized grass impurities from the yak hair; S1-6, pre-opening: pre-opening the yak hair processed in the previous step; S1-7, blending and oiling: Spraying the pre-opened yak hair with a blending emulsion, blending the hair two to three times, and then packing and curing for 24-36 hours; the blending emulsion is used in an amount of 6-8% by weight of the yak hair, and the moisture regain of the yak hair during blending is controlled at 24-30%; the blending emulsion comprises blending oil, an emulsifier, and water; S1-8, Combing: Use a three-cylinder two-combination combing machine to comb the fibers to make them straight and parallel single fibers. The combed fibers are made into a wool net, which is then made into small wool strips. The small wool strips are twisted and wound into several coarse yarn cakes.

3. The yak hair / yak wool embedded composite spinning process according to claim 1, characterized in that: The preparation of the yak wool roving comprises the following steps: S2-1, Sorting: Pick out the hard-to-open felt pieces and the obviously clumped coarse dead hair from the yak wool, and select the yak wool for combing; S2-2, opening: using a vertical cotton opener and a drum cotton opener to open the yak wool sorted in the previous step; S2-3, cleaning: Place the opened yak wool in a water tank for cleaning to remove dirt and impurities, and press dry; S2-4, Removal of oily sweat: Place the cleaned yak wool in a sink containing soft water, add 5-8 wt% detergent and 1-2 wt% builder to the soft water, and treat it under 23-39 kHz ultrasonic waves at 55-60°C for 10-20 minutes, and then wash with soft water and press dry; S2-5, drying: drying the yak wool treated in the previous step in an oven to a moisture regain of 14-17% at a temperature of 80-85°C; S2-6, pickling: placing the yak wool treated in the previous step in a pickling tank containing a pickling solution, treating at 55-60°C for 10-15 minutes, taking it out, rinsing it, and pressing it dry; the pickling solution contains 5-7.5wt% sulfuric acid; S2-7, carbonization: drying the yak wool treated in the previous step, and then drying it again after loosening, so that the acidified grass impurities are burnt, brittle and carbonized; S2-8, rolling and opening: the dried yak wool is rolled and opened multiple times, and the rolled and opened yak wool is dusted to separate the carbonized grass impurities from the yak wool; S2-9, pre-opening: pre-opening the yak wool processed in the previous step; S2-10, wool blending: Spraying the pre-opened yak wool with a wool blending emulsion consisting of wool blending oil and water, blending the wool twice, and then packing and curing for 24-36 hours; the wool blending emulsion contains 0.2-0.5wt% wool blending oil, and the moisture regain of the yak wool during the blending is controlled at 24-30%; S2-11, combing and removing coarse wool: combing the yak wool after mixing with the down by using a licker-in flat combined with a carding machine to prepare a hair-free velvet, wherein the coarse wool content of the hair-free velvet is not higher than 2.5%; S2-12, Mixing and oiling: Loosen and mix the yak wool and wool according to the set ratio, spray with oil, pour into the bin, mix and oil for two to three times, then pack and store for more than 12 hours; S2-13, carding: carding the mixed yak wool with a carding machine, and then making it into a fixed amount of coarse yarn; The speed of the cylinder is 330-360rpm, the speed of the licker-in is 350-450rpm, the sliver delivery speed is 80-100m / min, and the card sliver basis weight is 18-20g / 5m; The gauge between the licker-in and the feed plate is 0.15-0.20 mm, the gauge between the licker-in and the cylinder is 0.10-0.15 mm, the gauge between the cylinder and the doffer is 0.08-0.12 mm, the gauge between the cylinder and the cover at the entrance is 0.18-0.25 mm, and the gauge between the cylinder and the cover at the exit is 0.12-0.18 mm; S2-14 draw bar adopts three-pass draw bar, including first draw bar, second draw bar and last draw bar, with the draw bar numbers of 6, 8 and 8 respectively, the total drafting ratios of 6.5, 7.5 and 7.8 respectively, and the sliver weight is 3-3.5g / 5m; S2-15, roving: spindle speed 800 rpm, twist coefficient 380, axial winding density 3.2 turns / cm;.

4. The yak hair / yak wool embedded composite spinning process according to claim 2 or 3, characterized in that: The crude oil comprises quaternary ammonium salt of terminal amino hyperbranched compound, cross-linked hyperbranched waterborne polyurethane acrylate, Taiko oil, sodium fatty alcohol polyvinyl ether sulfate, soybean oil fatty acid methyl ester, octadecyl phosphate, hydroxyl modified amino silicone oil and deionized water.

5. The yak hair / yak wool embedded composite spinning process according to claim 3, characterized in that: Step S2-13 uses a metal card cloth with a tooth density of 460-500 points / inch used in the cylinder of the carding machine. 2 The card cloth includes a base and needle teeth, the tooth tip hardness is ≥780HV, the tooth tip includes a first arc segment, a straight segment and a second arc segment, the radius of the first arc segment is 0.05mm, the radius of the second arc segment is 0.1mm, and the angle of the front tooth surface is 55-60°, and the angle of the rear tooth surface is 30-35°; The doffer card wire has an eagle-beak-shaped tooth tip and a negative rake angle of -5° to -8°.

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