A method for preparing silk fabric

Abstract

The present application discloses a method for preparing a silk fabric, comprising the following steps: step 1): applying a finishing agent to the surface of a yarn containing long-staple cotton and mulberry silk for waxing and lubricating treatment; step 2): steam shaping the yarn containing long-staple cotton and mulberry silk; step 3): weaving to obtain a silk fabric; step 4): preparing a finishing liquid, adding the silk fabric into the finishing liquid, soaking, taking out the silk fabric, squeezing, washing, and drying to obtain a silk fabric; in step 1), the finishing agent comprises a wax emulsion and a spinning aid, and the spinning aid is selected from one or two of zinc oxide and aluminum-magnesium hydrotalcite. The silk fabric obtained by the preparation method of the present invention has high stiffness, and after 500 cycles of machine washing, it does not pill, lint, wrinkle, or snag, and still maintains good dimensional stability and tear strength stability.

Description

Technical Field

[0001] The present application relates to the field of textile engineering technology, and in particular to a method for preparing a silk fabric. Background Art

[0002] The main component of mulberry silk is natural animal protein fiber and contains a variety of amino acids. It is the most important raw material for silk weaving. It is smooth and soft, has good moisture absorption, breathability, antistatic properties, biocompatibility, and is comfortable to wear, making it popular among consumers. However, silk fabrics are not crisp, have poor wrinkle elasticity, and have poor wear resistance. The salt in sweat can reduce the strength of mulberry silk and make it easy to snag. It is not easy to machine wash. After machine washing, it is easy to pill, pill, snag, and wrinkle, and its strength is further reduced. In addition, the production and breeding of mulberry silk is limited by the region, resources are relatively scarce, and the price is high.

[0003] Therefore, it is necessary to develop a method for preparing a silk fabric that is more wrinkle-resistant, non-pilling and non-pilling after machine washing. Summary of the invention

[0004] The present invention aims to solve at least one of the problems of the prior art. Thus, the present invention provides a method for preparing a silk fabric, comprising the following steps:

[0005] Step 1): applying a finishing agent to the surface of the yarn containing long-staple cotton and mulberry silk for waxing and lubrication treatment;

[0006] Step 2): steam setting the yarn containing long-staple cotton and mulberry silk;

[0007] Step 3): weaving to obtain silk fabric;

[0008] Step 4): preparing a finishing liquid, adding the silk fabric into the finishing liquid, soaking, taking out the silk fabric, squeezing, washing, and drying to obtain the silk fabric;

[0009] In the step 1), the finishing agent comprises wax emulsion and spinning aid, and the spinning aid is selected from one or both of zinc oxide and aluminum-magnesium hydrotalcite.

[0010] Through the above technical scheme, zinc oxide and aluminum-magnesium hydrotalcite can activate certain groups on mulberry silk or long-staple cotton, thereby changing the microstructure of the silk fabric, thereby improving the stiffness of the silk fabric and improving the tear strength change rate and dimensional change rate after machine washing 500 times.

[0011] Preferably, in step 1), the mass ratio of the wax emulsion to the spinning aid is (20-30):1.

[0012] In the technical solution of the present invention, the mass ratio of the wax emulsion to the spinning aid can be (20-25):1, (25-30):1.

[0013] Preferably, in step 1), the spinning aid is composed of zinc oxide and aluminum-magnesium hydrotalcite in a mass ratio of (3-5):1.

[0014] In the technical solution of the present invention, the mass ratio of zinc oxide to aluminum-magnesium hydrotalcite can be (3-4):1 or (4-5):1.

[0015] Through the above technical scheme, when the spinning aid added to the finishing agent is a mixture of zinc oxide and aluminum-magnesium hydrotalcite, especially when the mass ratio of zinc oxide to aluminum-magnesium hydrotalcite is (3-5):1, the stiffness of the silk fabric is further improved compared with the use of zinc oxide or aluminum-magnesium hydrotalcite alone, and the tear strength change rate and dimensional change rate after machine washing 500 times are further reduced. In terms of improving the stiffness of the silk fabric, zinc oxide and aluminum-magnesium hydrotalcite show obvious synergistic effect.

[0016] Preferably, in step 1), the zinc oxide is nano zinc oxide.

[0017] Through the above technical solution, when zinc oxide becomes nano zinc oxide, nano zinc oxide can more easily penetrate into the interior of the silk fabric, thereby improving the stiffness of the silk fabric, and improving the tear strength change rate and dimensional change rate after 500 machine washes.

[0018] Preferably, in step 4), the finishing solution comprises hexahydroxy resin and sodium chloride, the concentration of the hexahydroxy resin is 200-250 g / L, and the concentration of the sodium chloride is 4-8 g / L.

[0019] In the technical solution of the present invention, the concentration of the hexahydroxy resin can be 200-220 g / L or 220-250 g / L.

[0020] In the technical solution of the present invention, the concentration of sodium chloride can be 4-5g / L or 5-8g / L.

[0021] Through the above technical scheme, zinc oxide can not only activate certain groups on mulberry silk or long-staple cotton, but also activate the hydroxyl groups of hexahydroxy resin, improve the cross-linking effect between mulberry silk or long-staple cotton and hexahydroxy resin, and then change the microstructure of silk fabric, thereby improving the stiffness of silk fabric and improving the tear strength change rate and dimensional change rate after machine washing 500 times.

[0022] Preferably, in step 4), the mass ratio of sodium chloride to hexahydroxy resin is (0.016-0.04):1.

[0023] In the technical solution of the present invention, the mass ratio of sodium chloride to hexahydroxy resin can be (0.016-0.027):1, (0.027-0.04):1.

[0024] Preferably, the finishing solution further comprises gluten, and the concentration of the gluten is 20-30 g / L.

[0025] In the technical solution of the present invention, the concentration of gluten powder can be 20-25 g / L or 25-30 g / L.

[0026] Through the above technical solution, the tear strength change rate of the silk fabric after machine washing 500 times becomes smaller.

[0027] Furthermore, in the step 4), the soaking is performed at 20-35 degrees Celsius for 3-5 hours.

[0028] In the technical solution of the present invention, the soaking temperature can be 20-30 degrees Celsius, 20-25 degrees Celsius, 25-30 degrees Celsius, or 30-35 degrees Celsius.

[0029] Furthermore, in the step 4), the mass volume ratio of the silk fabric to the finishing liquid is 60-80 g / L.

[0030] In the technical solution of the present invention, the mass volume ratio of the silk fabric to the finishing liquid can be 60-70 g / L or 70-80 g / L.

[0031] Furthermore, the yarn containing long-staple cotton and mulberry silk is prepared by the following steps:

[0032] Step 1: Take long-staple cotton and carry out cotton cleaning and carding processes, and then carry out doubling, roving and spun yarn processing to obtain single yarn;

[0033] Step 2: two single yarns are made according to step 1, and the two single yarns are twisted into double yarns;

[0034] Step 3: Take mulberry silk and make single yarn;

[0035] Step 4: twisting the double-ply yarn obtained in step 2 and the single yarn obtained in step 3 into three-ply yarn, which is the yarn containing long-staple cotton and mulberry silk.

[0036] The beneficial effects of the present invention are:

[0037] The present invention provides a method for preparing a silk fabric. By adjusting the spinning aid in the waxing process and treating the silk fabric with a finishing liquid, a silk fabric is obtained which does not pill, lint, wrinkle or snag after machine washing. The silk fabric has high stiffness and a bending length of 55 mm or more, 60 mm or more, or even 75 mm or more, or 80 mm or more. After 500 cycles of machine washing, the knitted fabric obtained by the preparation method of the present invention still maintains good dimensional stability and tear strength stability, with a dimensional change rate within the range of -2.0%-1.0%, or even within the range of -0.5%-0%, and a tear strength reduction rate within the range of 15%, or even within the range of 10%, within the range of 5%, or within the range of 3%. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with specific examples, but the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. In the following examples, if specific conditions are not specified, they are carried out according to conventional conditions or conditions recommended by the manufacturer. The methods used are conventional methods known in the art unless otherwise specified, and the consumables and reagents used are commercially available unless otherwise specified. Unless otherwise specified, the professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method or material similar to or equal to the recorded content can also be applied to the present invention. In the embodiment, the wax emulsion is a polyethylene wax emulsion, specifically RUCO-FILAWG polyethylene wax emulsion produced by Rudolf Company of Germany. Nano zinc oxide was purchased from Nanjing Xianfeng Nanomaterial Technology Co., Ltd. Hexahydroxy resin is methylated hexahydroxymethyl melamine resin, purchased from Zhejiang Xinhaitian Biotechnology Co., Ltd. Aluminum magnesium hydrotalcite was purchased from Shanghai Jizhi Biochemical Technology Co., Ltd.

[0039] Example 1

[0040] The method for preparing a silk fabric comprises the following steps:

[0041] Step 1): taking long-staple cotton and putting it into a cotton plucking machine for cotton cleaning and combing, and then performing doubling, roving and spun yarn processing to obtain single yarn;

[0042] Step 2): two single yarns are made according to step 1), and the two single yarns are twisted into 80s / 2 double yarns by a twisting machine;

[0043] Step 3): Take mulberry silk and make 80s / 1 single yarn;

[0044] Step 4): twisting the double-ply yarn obtained in step 2) and the single yarn obtained in step 3) into a yarn (three-ply yarn) containing long-staple cotton and mulberry silk using a twisting machine;

[0045] Step 5): the yarn wax emulsion and the spinning aid are mixed to form a finishing agent, and the finishing agent is adhered to the surface of the three-ply yarn by a waxing machine;

[0046] Step 6): shaping the three-ply yarn by spraying steam with water;

[0047] Step 7): Weaving the three-ply yarn formed in step 6) by conventional process using a large circular knitting machine with high needle and high density to obtain a silk fabric;

[0048] Step 8): Prepare a finishing liquid, add the silk fabric into the finishing liquid, soak it at 25 degrees Celsius for 4 hours, take out the silk fabric, squeeze it dry, wash it with clean water, and dry it to obtain the silk fabric.

[0049] In step 5), the finishing agent is obtained by uniformly mixing 25 kg of wax emulsion and 1 kg of spinning auxiliary agent, and the spinning auxiliary agent is zinc oxide.

[0050] In step 8), the finishing liquid is an aqueous solution containing hexahydroxy resin and sodium chloride, wherein the concentration of the hexahydroxy resin is 220 g / L and the concentration of the sodium chloride is 5 g / L.

[0051] The mass volume ratio of silk fabric to finishing liquid is 70g / L.

[0052] Example 2

[0053] The method for preparing a silk fabric comprises the following steps:

[0054] Step 1): taking long-staple cotton and putting it into a cotton plucking machine for cotton cleaning and combing, and then performing doubling, roving and spun yarn processing to obtain single yarn;

[0055] Step 2): two single yarns are made according to step 1), and the two single yarns are twisted into 80s / 2 double yarns by a twisting machine;

[0056] Step 3): Take mulberry silk and make 80s / 1 single yarn;

[0057] Step 4): twisting the double-ply yarn obtained in step 2) and the single yarn obtained in step 3) into a yarn (three-ply yarn) containing long-staple cotton and mulberry silk using a twisting machine;

[0058] Step 5): the yarn wax emulsion and the spinning aid are mixed to form a finishing agent, and the finishing agent is adhered to the surface of the three-ply yarn by a waxing machine;

[0059] Step 6): shaping the three-ply yarn by spraying steam with water;

[0060] Step 7): Weaving the three-ply yarn formed in step 6) by conventional process using a large circular knitting machine with high needle and high density to obtain a silk fabric;

[0061] Step 8): prepare a finishing liquid, add the silk fabric into the finishing liquid, soak it at 20 degrees Celsius for 5 hours, take out the silk fabric, squeeze it dry, wash it with clean water, and dry it to obtain the silk fabric.

[0062] In step 5), the finishing agent is obtained by uniformly mixing 20 kg of wax emulsion and 1 kg of spinning auxiliary agent, and the spinning auxiliary agent is zinc oxide.

[0063] In step 8), the finishing liquid is an aqueous solution containing hexahydroxy resin and sodium chloride, wherein the concentration of the hexahydroxy resin is 250 g / L and the concentration of the sodium chloride is 4 g / L.

[0064] The mass volume ratio of silk fabric to finishing liquid is 80g / L.

[0065] Example 3

[0066] The method for preparing a silk fabric comprises the following steps:

[0067] Step 1): taking long-staple cotton and putting it into a cotton plucking machine for cotton cleaning and combing, and then performing doubling, roving and spun yarn processing to obtain single yarn;

[0068] Step 2): two single yarns are made according to step 1), and the two single yarns are twisted into 80s / 2 double yarns by a twisting machine;

[0069] Step 3): Take mulberry silk and make 80s / 1 single yarn;

[0070] Step 4): twisting the double-ply yarn obtained in step 2) and the single yarn obtained in step 3) into a yarn (three-ply yarn) containing long-staple cotton and mulberry silk using a twisting machine;

[0071] Step 5): the yarn wax emulsion and the spinning aid are mixed to form a finishing agent, and the finishing agent is adhered to the surface of the three-ply yarn by a waxing machine;

[0072] Step 6): shaping the three-ply yarn by spraying steam with water;

[0073] Step 7): Weaving the three-ply yarn formed in step 6) by conventional process using a large circular knitting machine with high needle and high density to obtain a silk fabric;

[0074] Step 8): prepare a finishing liquid, add the silk fabric into the finishing liquid, soak it at 30 degrees Celsius for 3 hours, take out the silk fabric, squeeze it dry, wash it with clean water, and dry it to obtain the silk fabric.

[0075] In step 5), the finishing agent is obtained by uniformly mixing 30 kg of wax emulsion and 1 kg of spinning auxiliary agent, and the spinning auxiliary agent is zinc oxide.

[0076] In step 8), the finishing liquid is an aqueous solution containing hexahydroxy resin and sodium chloride, wherein the concentration of the hexahydroxy resin is 200 g / L and the concentration of the sodium chloride is 8 g / L.

[0077] The mass volume ratio of silk fabric to finishing liquid is 60g / L.

[0078] Example 4

[0079] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 1, except that the spinning aid in step 5) is aluminum-magnesium hydrotalcite.

[0080] Example 5

[0081] This embodiment provides a method for preparing a silk fabric, and the preparation method is referred to Example 1, except that the spinning aid in step 5) is a mixture of zinc oxide and aluminum-magnesium hydrotalcite, wherein the mass ratio of zinc oxide to aluminum-magnesium hydrotalcite is 4:1.

[0082] Example 6

[0083] This embodiment provides a method for preparing a silk fabric, and the preparation method is referred to in Example 1, except that the spinning aid in step 5) is a mixture of zinc oxide and aluminum-magnesium hydrotalcite, wherein the mass ratio of zinc oxide to aluminum-magnesium hydrotalcite is 3:1.

[0084] Example 7

[0085] This embodiment provides a method for preparing a silk fabric, and the preparation method is referred to Example 1, except that the spinning aid in step 5) is a mixture of zinc oxide and aluminum-magnesium hydrotalcite, wherein the mass ratio of zinc oxide to aluminum-magnesium hydrotalcite is 5:1.

[0086] Example 8

[0087] This embodiment provides a method for preparing a silk fabric. The preparation method is based on the method of embodiment 5, except that the zinc oxide used as a spinning aid in step 5) is nano zinc oxide.

[0088] Example 9

[0089] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 8, except that in step 8), the finishing liquid further contains gluten powder, and the concentration of the gluten powder is 25 g / L.

[0090] Example 10

[0091] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 9, except that in step 8), the concentration of gluten is 20 g / L.

[0092] Embodiment 11

[0093] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 9, except that in step 8), the concentration of gluten is 30 g / L.

[0094] Example 12

[0095] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 9, except that in step 8), the soaking temperature is 35 degrees Celsius.

[0096] Comparative Example 1

[0097] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 1, except that in step 5), the spinning aid is titanium dioxide.

[0098] Comparative Example 2

[0099] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 1, except that, in step 5), no spinning aid is included.

[0100] Comparative Example 3

[0101] This embodiment provides a method for preparing a silk fabric. The preparation method is similar to that of Embodiment 1, except that the method does not include the finishing liquid treatment process in step 8).

[0102] That is, step 8): washing the silk fabric with clean water and drying it to obtain the silk fabric.

[0103] The stiffness, tear strength change rate after 500 machine washings, and dimensional change rate of the silk fabrics obtained in Examples 1-12 and Comparative Examples 1-3 were measured by the following methods, respectively. The results are shown in Table 1, and the appearance (pilling, fuzzing, wrinkling, snagging, etc.) was evaluated.

[0104] The tear strength is tested on a YG065H / PC electronic fabric strength tester with reference to GB / T 3917.2-2009 Tear properties of textile fabrics Part 2: Determination of tear strength of trouser-shaped specimens (single seam). Three samples are tested in the same direction for each sample and the average value is taken.

[0105] In a washing machine (Haier EG100MATE2S), wash with warm water at 40°C for 45 minutes, rinse at 30°C for 15 minutes, and dry. This is considered one cycle. After 500 consecutive cycles, the tear strength is measured again.

[0106] Tear strength change rate % = ((tear strength after washing - tear strength before washing) / tear strength before washing) × 100%.

[0107] Stiffness: Refer to GB / T 18318-2001 "Determination of bending length of textile fabrics".

[0108] Dimensional change rate: In a washing machine (Haier EG100MATE2S), use 40°C warm water to wash for 45 minutes, then rinse at 30°C for 15 minutes and dry. This is one cycle. After 500 consecutive cycles, calculate the dimensional change rate in the same direction to determine the washing durability.

[0109] Dimensional change rate % = ((length after washing - length before washing) / length before washing) x 100%.

[0110] Table 1 Measurement results of stiffness, tear strength change rate and dimensional change rate of silk fabrics obtained in Examples 1-12 and Comparative Examples 1-3 after 500 machine washings

[0111]

[0112] At the same time, in a washing machine (Haier EG100MATE2S), washing was performed with warm water at 40°C for 45 minutes, then rinsed at 30°C for 15 minutes, and dried. The above was considered as one cycle. After 500 consecutive cycles, the surface morphology was observed from the aspects of pilling, fuzzing, wrinkling, and snagging. The results showed that Examples 1-12 had no pilling, no fuzzing, no wrinkling, and no snagging, while Comparative Example 1 had fuzzing and wrinkling, Comparative Example 2 had fuzzing, wrinkling, and pilling, and Comparative Example 3 had pilling, fuzzing, wrinkling, and snagging.

[0113] By comparing Examples 1-3 with Comparative Example 1 and combining the data in Table 1, it can be seen that when the spinning aid in the finishing agent is changed to titanium dioxide, the stiffness of the silk fabric is significantly reduced, and the tear strength change rate and size change rate after 500 machine washings are significantly increased. This shows that zinc oxide is beneficial to improving the stiffness of the silk fabric and improving the tear strength change rate and size change rate after 500 machine washings. This may be because zinc oxide can activate certain groups on mulberry silk or long-staple cotton, thereby changing the microstructure of the silk fabric, thereby improving the stiffness of the silk fabric and improving the tear strength change rate and size change rate after 500 machine washings.

[0114] Comparison of Examples 1-3 with Comparative Example 2 and the data in Table 1 shows that when zinc oxide is not added as a spinning aid in the finishing agent, the stiffness of the silk fabric significantly decreases, and the tear strength change rate and dimensional change rate after 500 machine washes significantly increase.

[0115] Comparison of Examples 1-3 with Comparative Example 3 and the data in Table 1 shows that when the preparation method of the silk fabric does not include step 8), there is no treatment process with the finishing liquid, and the stiffness of the silk fabric is significantly reduced, and the tear strength change rate and size change rate after machine washing 500 times are significantly increased. This may be because the hexahydroxy resin can cross-link with certain groups on mulberry silk or long-staple cotton, and zinc oxide can not only activate certain groups on mulberry silk or long-staple cotton, but also activate the hydroxyl group of the hexahydroxy resin, improve the cross-linking effect between mulberry silk or long-staple cotton and the hexahydroxy resin, and then change the microstructure of the silk fabric, thereby improving the stiffness of the silk fabric, and improving the tear strength change rate and size change rate after machine washing 500 times.

[0116] From the comparison of Example 4 and Comparative Example 2 combined with the data in Table 1, it can be seen that when a spinning aid is added to the finishing agent and the spinning aid is aluminum-magnesium hydrotalcite, the stiffness of the silk fabric is slightly improved, and the tear strength change rate and dimensional change rate after machine washing 500 times are significantly improved.

[0117] Comparison of Example 1, Example 4, and Examples 5-7 combined with the data in Table 1 shows that when the spinning aid added to the finishing agent is a mixture of zinc oxide and aluminum-magnesium hydrotalcite, especially when the mass ratio of zinc oxide to aluminum-magnesium hydrotalcite is (3-5):1, the stiffness of the silk fabric is further improved compared with using zinc oxide or aluminum-magnesium hydrotalcite alone, and the tear strength change rate and dimensional change rate after machine washing 500 times are further reduced. In terms of improving the stiffness of the silk fabric, zinc oxide and aluminum-magnesium hydrotalcite show obvious synergistic effect.

[0118] Comparison of Examples 5-7 and Example 8 combined with the data in Table 1 shows that when zinc oxide becomes nano zinc oxide, zinc oxide can more easily penetrate into the interior of the silk fabric, the stiffness of the silk fabric is improved, and the tear strength change rate and dimensional change rate after machine washing 500 times are improved.

[0119] Comparison of Example 8 and Examples 9-11 combined with the data in Table 1 shows that when gluten is further added to the finishing liquid in step 8), the tear strength change rate of the silk fabric after machine washing 500 times is improved.

[0120] Comparison of Example 9 and Example 12 combined with the data in Table 1 shows that when the immersion temperature in step 8) increases, the stiffness of the silk fabric decreases slightly, and the tear strength change rate and dimensional change rate after 500 machine washings increase slightly.

[0121] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for preparing a silk fabric, characterized in that: The steps include: Step 1): The finishing agent is applied to the surface of the yarn containing long-staple cotton and mulberry silk for waxing and lubrication treatment; Step 2): Steam setting of yarn containing long-staple cotton and mulberry silk; Step 3): Weaving to obtain silk fabric; Step 4): preparing a finishing liquid, adding the silk fabric into the finishing liquid, soaking, taking out the silk fabric, squeezing, washing, and drying to obtain the silk fabric; In the step 1), the finishing agent includes wax emulsion and spinning aid, The spinning aid is composed of zinc oxide and aluminum-magnesium hydrotalcite in a mass ratio of (3-5):1; In the step 4), the finishing solution includes hexahydroxy resin and sodium chloride, the concentration of the hexahydroxy resin is 200-250 g / L, and the concentration of the sodium chloride is 4-8 g / L.

2. The method for preparing silk fabric according to claim 1, characterized in that: In the step 1), the mass ratio of the wax emulsion to the spinning aid is (20-30):

1.

3. The method for preparing silk fabric according to claim 1, characterized in that: In the step 1), the zinc oxide is nano zinc oxide.

4. The method for preparing silk fabric according to claim 1, characterized in that: In the step 4), the mass ratio of sodium chloride to hexahydroxy resin is (0.016-0.04):

1.

5. The method for preparing silk fabric according to claim 1, characterized in that: In the step 4), the finishing liquid further comprises gluten powder, and the concentration of the gluten powder is 20-30 g / L.

6. The method for preparing silk fabric according to claim 1, characterized in that: In the step 4), the soaking is performed at 20-35 degrees Celsius for 3-5 hours.

7. The method for preparing silk fabric according to claim 1, characterized in that: In the step 4), the mass volume ratio of the silk fabric to the finishing liquid is 60-80 g:1 L.

8. The method for preparing silk fabric according to claim 1, characterized in that: The yarn containing long-staple cotton and mulberry silk is prepared by the following steps: Step 1: Take long-staple cotton and carry out cotton cleaning and carding processes, and then carry out doubling, roving and spun yarn processing to obtain single yarn; Step 2: two single yarns are made according to step 1, and the two single yarns are twisted into double yarns; Step 3: Take mulberry silk and make single yarn; Step 4: twisting the double-ply yarn obtained in step 2 and the single yarn obtained in step 3 into three-ply yarn, which is the yarn containing long-staple cotton and mulberry silk.

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