Wrapped yarn and preparation method thereof

Abstract

The invention discloses wrap yarn and a preparation method thereof. The invention relates to the technical field of textile, solves the problems that a subsequently manufactured product is insufficient in durability and easy to damage due to insufficient strength of the wrap yarn, and particularly discloses a wrap yarn and a preparation method thereof.The wrap yarn comprises a yarn core and wrap yarn, the wrap yarn wraps the outer surface of the yarn core in a net shape, and the wrap yarn is arranged in the yarn core. The wrap yarn with the twist degree of 650 tpm + / -10 tpm is formed; the yarn core is a combination of one or more of a steel wire, a glass fiber filament, a spandex filament or a polyester filament; the coated yarn comprises a chinlon material and a polyester material, and the mass ratio of the chinlon material to the polyester material in the coated yarn is (1: 4)-(1: 2.5); the breaking strength of the wrap yarn formed by the yarn core and the wrap yarn is not lower than 20 cN / tex, and the elongation at break is controlled to be 52%-56%; the preparation method of the wrap yarn comprises the steps of raw material preparation and loading, wrapping processing, post-processing, quality detection, packaging and warehousing and the like. The invention provides the wrap yarn product with high elasticity, high strength and high durability and the production and manufacturing method of the wrap yarn product.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, in particular to a coated yarn and a preparation method thereof. Background Art

[0002] Covered yarn is made by wrapping part of the fiber or the whole yarn or filament on the yarn core (core filament). According to the wrapping method, it can be divided into many types, such as core-spun yarn with filament as the core, jet-wrapped yarn can be formed by wrapping the side fiber under the action of the nozzle; there are also core-spun yarns formed by wrapping the fibers in different ways on the ring spinning equipment, such as air vortex core-spun yarn, self-twist wrapped yarn, rotor core-spun yarn, etc. Covered yarn has a fluffy structure, a full feel, uniform yarn and less surface hairiness, making it suitable for products such as velvet woven fabrics.

[0003] In spandex covered yarn, the spandex core yarn is the main source of its elastic properties. For example, when there are at least two spandex core yarns arranged in parallel, the elasticity of the composite covered yarn will be greatly enhanced as the number increases. The spandex fineness can be reasonably selected according to the yarn quality requirements. Low-count spandex filaments are used for fine yarns with low elasticity requirements, and high-count spandex filaments are used for thick yarns with high elasticity requirements.

[0004] When making spandex coated yarn, the yarn spinning process involves different spinning methods for ordinary fibers and spandex yarns. Ordinary fibers are mechanically stretched and twisted, while spandex yarns require special equipment for extrusion molding and are pulled and dried. There are different coating methods, such as double-bracket coating and single-bracket coating. The double-bracket coating method can better control the distribution of spandex yarns and improve the coating effect, while the single-bracket coating method has lower costs and higher production efficiency. Finishing of finished products includes operations such as de-impurity, winding, and dyeing, such as removing hairiness, straightening fibers, adjusting tension, evenly winding for easy transportation and storage, and dyeing according to market demand.

[0005] In order to ensure the elastic performance, the coated yarn in the prior art only adjusts the ratio of the yarn core and the coating layer, but has the problem of insufficient strength after molding, so that the subsequent manufactured products are insufficiently durable and easily damaged. Summary of the invention

[0006] In order to solve the problem in the prior art that the strength of the coated yarn is insufficient, resulting in insufficient durability and easy damage of subsequent manufactured products, the present invention provides a coated yarn and a preparation method thereof.

[0007] The technical solution adopted by the present invention is:

[0008] A covered yarn, comprising a yarn core and covering filaments, wherein the covering filaments are arranged on the outer surface of the yarn core in a mesh shape to form a covered yarn with a twist of 650 tpm±10 tpm, wherein tpm is twist / 10 cm, the mass content of the yarn core in the covered yarn is 28%-42%, and the mass content of the covering filaments is 65%-72%;

[0009] Wherein, the yarn core is a combination of one or more of steel wire, glass fiber wire, spandex filament or polyester filament;

[0010] Wherein, the coated yarn comprises nylon material and polyester material, and the mass ratio of the nylon material and the polyester material in the coated yarn is 1:4 to 1:2.5;

[0011] The breaking strength of the covered yarn formed by the yarn core and the covered yarn is not less than 20 cN / tex, and the breaking elongation is controlled at 52%-56%.

[0012] Furthermore, the nylon material and polyester material in the coated yarn are nylon yarn and polyester yarn, which are combined to form outer coated fibers tightly coated on the outer surface of the yarn core, and the spacing between the coating points of the nylon yarn and the polyester yarn on the surface of the yarn core is 0.5cm-0.8cm.

[0013] Furthermore, a shrinkage-resistant thread is arranged between the yarn core and the covering yarn. The shrinkage-resistant thread is spirally wound on the surface of the yarn core, and the covering yarn covers the surface of the yarn core and the shrinkage-resistant thread. The shrinkage-resistant thread is used to reduce the size shortening of the covering yarn during weaving and use.

[0014] Furthermore, antibacterial agent, flame retardant, softener and antistatic agent are added to the coated yarn, and the mass percentages of the antibacterial agent, flame retardant, softener and antistatic agent in the coated yarn are 3%-8%, 8%-18%, 2%-4% and 0.5%-2.5% respectively.

[0015] A method for preparing a coated yarn comprises the following steps:

[0016] S100, raw material preparation and loading, according to the design requirements of the covered yarn, prepare the required raw materials of the yarn core and the covering yarn, place the yarn core and the covering yarn in the covering yarn integrated machine to prepare for covering processing;

[0017] S200, covering processing, debugging the covering yarn integrated machine, adjusting the pulling speed, twisting degree and covering angle of the covering yarn integrated machine, starting the equipment to start covering processing;

[0018] S300, post-treatment, heat treatment and shaping treatment are performed on the coated yarn, temperature and time parameters are controlled in the heat treatment and shaping treatment, and the coated yarn is cleaned and arranged to remove impurities and oil stains on the surface;

[0019] S400, quality inspection, quality inspection of the covered yarn, the inspection indicators include breaking strength, breaking elongation and twist, the inspection requires that the parameter error of each indicator is no more than 2%;

[0020] S500, packaging and warehousing, sealing the qualified coated yarn, marking the information by attaching labels on them, and sending the packaged coated yarn to the warehouse for storage.

[0021] Furthermore, the S100 further includes the following steps:

[0022] S101, nylon winding, winding the nylon material with a winding machine to form a nylon yarn tube with a required capacity, ensuring that the nylon has no defects such as nodes and broken ends in the subsequent coating process, and then combining the nylon yarn with the polyester yarn in proportion to form a coated yarn;

[0023] S102, anti-shrinkage pre-treatment, setting anti-shrinkage silk thread on the yarn core, ensuring that the tension of the anti-shrinkage silk thread matches the yarn core, and adjusting the spiral angle and spacing of the anti-shrinkage silk thread according to product parameter requirements.

[0024] Furthermore, the step S200 further includes the following steps:

[0025] S201, when the yarn core and the covering yarn are pulled and twisted in the device, the covering yarn is arranged on the outer surface of the yarn core in a mesh shape to form a covering yarn with a twist of 650 tpm±10 tpm, and the covering point spacing of the covering yarn is adjusted to 0.5 cm-0.8 cm;

[0026] S202. Add antibacterial agent, flame retardant, softener and antistatic agent to the coated yarn, with the added content of antibacterial agent being 3%-8%, flame retardant being 8%-18%, softener being 2%-4%, and antistatic agent being 0.5%-2.5%.

[0027] Furthermore, the S300 specifically includes the following steps:

[0028] S301, heat treating the coated yarn, wherein the heat treatment temperature is controlled at 100° C.-150° C., and the heat treatment time is controlled at 5 minutes-12 minutes;

[0029] S302, shaping the coated yarn, controlling the shaping treatment temperature at 175° C.-205° C., and controlling the shaping treatment time at 30 seconds-2.5 minutes.

[0030] Furthermore, the breaking strength of the covered yarn formed by the yarn core and the covered yarn in S400 is not less than 20 cN / tex, and the breaking elongation is controlled at 52%-56%.

[0031] Furthermore, in S500, the temperature of the warehouse storage environment is controlled at 20° C. to 28° C., the humidity is controlled at 50% to 70%, and the storage environment is free from direct sunlight.

[0032] The beneficial effects of the present invention are:

[0033] The performance of the coated yarn product of the present invention is precisely controlled, so that the coated yarn product has good air permeability and hand feel, and is not easy to wrinkle or deform, thereby improving the strength and durability of the coated yarn after molding. In the production process of the coated yarn, polyester and nylon are mixed and used as the outer layer to cover the core yarn of the yarn. This structure makes the coated yarn of the present invention not only have excellent elasticity, but also integrates the wear resistance, wrinkle resistance and air permeability characteristics of polyester. Compared with the coated yarn of the prior art, the coated yarn of the present invention can meet higher requirements for fabric weaving, and the products made are comfortable to use and have a longer service life.

[0034] The coated yarn product produced by the coated yarn preparation method of the present invention has better physical properties. The method adjusts the parameters such as the pulling speed, twisting degree and coating angle of the adjustment equipment during the coating process, thereby ensuring the uniform and stable quality of the coated yarn and improving its physical properties; through precise raw material selection management, the waste and loss of raw materials are avoided, thereby reducing production costs. The preparation method reduces the scrap rate and rework rate in the production process, further reducing costs. The preparation method of the present invention also improves product quality and stability. By accurately controlling the temperature and humidity of the storage environment, the method can ensure that the elasticity and softness of each fiber are maintained to the greatest extent, preventing the degradation of fiber performance due to improper environment, and suitable humidity conditions help maintain the moisture balance of the fiber, preventing adhesion, agglomeration and physical property changes caused by excessive drying or excessive humidity, thereby ensuring the stability of the yarn. The preparation method of the present invention controls the temperature and time parameters in the heat treatment and the shaping treatment, and the method has high accuracy, thereby ensuring the consistency and high quality of the coated yarn product. Through the heat treatment and the shaping treatment, the dimensional stability and durability of the coated yarn are significantly improved, and the overall quality of the product is improved. The quality inspection link accurately detects key indicators such as breaking strength, breaking elongation and twist, and sets a strict error range, thereby effectively controlling the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative work, among which:

[0036] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The coated yarn of the present invention is composed of a yarn core and a coating filament, wherein the coating filament is arranged on the outer surface of the yarn core in a mesh-like manner. This structure enables the coated yarn to have both the strength and characteristics of the yarn core and the flexibility and wear resistance of the coating filament. The twist of the coated yarn is 650tpm±10tpm (tpm is twist / 10cm), which ensures the stability and strength of the yarn. At the same time, the mass content of the yarn core is 28%-42%, and the mass content of the coating filament is 65%-72%. This ratio enables the coated yarn to have good elasticity and wear resistance while maintaining sufficient strength.

[0041] Preferably, the yarn core can be selected from one or more combinations of steel wire, glass fiber yarn, spandex filament or polyester filament, in order to make the coated yarn have a wide range of applicability and application scenarios. The coated yarn includes nylon material and polyester material, and the mass ratio of nylon material and polyester material in the coated yarn is 1:4 to 1:2.5, in order to optimize the physical properties of the coated yarn. The breaking strength of the coated yarn is not less than 20cN / tex, and the elongation at break is controlled at 52%-56%. By controlling the performance parameters, the reliability and durability of the coated yarn in practical applications can be ensured.

[0042] As one of the embodiments, the spacing between the coating points of nylon yarn and polyester yarn on the surface of the yarn core is 0.5cm-0.8cm, so that the coated yarn has good flexibility and hand feel while maintaining strength. Anti-shrinkage silk thread is also arranged between the yarn core and the coating silk, and is spirally wound on the surface of the yarn core. The anti-shrinkage silk thread can effectively reduce the size shortening of the coated yarn during weaving and use, and improve the stability and reliability of the product. The present invention can also add antibacterial agents, flame retardants, softeners and antistatic agents to the coated silk. These additives can make the coated yarn product have multiple functional characteristics such as antibacterial, flame retardant, soft and antistatic, and meet the needs of different application scenarios.

[0043] The performance of the coated yarn product of the present invention is precisely controlled, so that the coated yarn product has good air permeability and hand feel, and is not easy to wrinkle or deform, thereby improving the strength and durability of the coated yarn after molding. In the production process of the coated yarn, polyester and nylon are mixed and used as the outer layer to cover the core yarn of the yarn. This structure makes the coated yarn of the present invention not only have excellent elasticity, but also integrates the wear resistance, wrinkle resistance and air permeability characteristics of polyester. Compared with the coated yarn of the prior art, the coated yarn of the present invention can meet higher requirements for fabric weaving, and the products made are comfortable to use and have a longer service life.

[0044] The preparation method of the coated yarn of the present invention can be specifically implemented as follows:

[0045] S100, raw material preparation and loading, according to the design requirements of the covered yarn, prepare the required raw materials of the yarn core and the covering yarn, place the yarn core and the covering yarn in the covering yarn integrated machine for covering processing, which may specifically include:

[0046] S101, nylon winding, winding the nylon material with a winding machine to form a nylon yarn tube with a required capacity, ensuring that the nylon has no defects such as nodes and broken ends in the subsequent coating process, and then combining the nylon yarn with the polyester yarn in proportion to form a coated yarn;

[0047] S102, anti-shrinkage pre-treatment, setting anti-shrinkage silk thread on the yarn core, ensuring that the tension of the anti-shrinkage silk thread matches the yarn core, and adjusting the spiral angle and spacing of the anti-shrinkage silk thread according to product parameter requirements.

[0048] S200, covering processing, debugging the covering yarn integrated machine, adjusting the traction speed, twisting degree and covering angle of the covering yarn integrated machine, starting the equipment to start covering processing, which may specifically include:

[0049] S201, when the yarn core and the covering yarn are pulled and twisted in the device, the covering yarn is arranged on the outer surface of the yarn core in a mesh shape to form a covering yarn with a twist of 650 tpm±10 tpm, and the covering point spacing of the covering yarn is adjusted to 0.5 cm-0.8 cm;

[0050] S202. Add antibacterial agent, flame retardant, softener and antistatic agent to the coated yarn, with the added content of antibacterial agent being 3%-8%, flame retardant being 8%-18%, softener being 2%-4%, and antistatic agent being 0.5%-2.5%.

[0051] S300, post-treatment, heat treatment and shaping treatment are performed on the coated yarn, temperature and time parameters are controlled in the heat treatment and shaping treatment, and the coated yarn is cleaned and sorted to remove impurities and oil stains on the surface, which may specifically include:

[0052] S301, heat treating the coated yarn, wherein the heat treatment temperature is controlled at 100° C.-150° C., and the heat treatment time is controlled at 5 minutes-12 minutes;

[0053] S302, shaping the coated yarn, controlling the shaping treatment temperature at 175° C.-205° C., and controlling the shaping treatment time at 30 seconds-2.5 minutes.

[0054] S400, quality inspection, quality inspection of the coated yarn, the inspection indicators include breaking strength, breaking elongation and twist, and the inspection requires that the parameter error of each indicator is not more than 2%; as a preferred embodiment, the breaking strength of the coated yarn formed by the yarn core and the coated yarn in S400 is not less than 20cN / tex, and the breaking elongation is controlled at 52%-56%.

[0055] S500, packaging and warehousing, sealing the qualified coated yarn, marking the information by affixing labels on the labels, and sending the packaged coated yarn to the warehouse for storage; as a preferred embodiment, in S500, the temperature of the warehouse storage environment is controlled at 20°C to 28°C, the humidity is controlled at 50% to 70%, and the storage environment is free from direct sunlight.

[0056] The coated yarn product produced by the coated yarn preparation method of the present invention has better physical properties. The method adjusts the parameters such as the pulling speed, twisting degree and coating angle of the adjustment equipment during the coating process, thereby ensuring the uniform and stable quality of the coated yarn and improving its physical properties; through precise raw material selection management, the waste and loss of raw materials are avoided, thereby reducing production costs. The preparation method reduces the scrap rate and rework rate in the production process, further reducing costs. The preparation method of the present invention also improves product quality and stability. By accurately controlling the temperature and humidity of the storage environment, the method can ensure that the elasticity and softness of each fiber are maintained to the greatest extent, preventing the degradation of fiber performance due to improper environment, and suitable humidity conditions help maintain the moisture balance of the fiber, preventing adhesion, agglomeration and physical property changes caused by excessive drying or excessive humidity, thereby ensuring the stability of the yarn. The preparation method of the present invention controls the temperature and time parameters in the heat treatment and the shaping treatment, and the method has high accuracy, thereby ensuring the consistency and high quality of the coated yarn product. Through the heat treatment and the shaping treatment, the dimensional stability and durability of the coated yarn are significantly improved, and the overall quality of the product is improved. The quality inspection link accurately detects key indicators such as breaking strength, breaking elongation and twist, and sets a strict error range, thereby effectively controlling the product quality.

[0057] The coated yarn and preparation method of the present invention are specifically described below by way of examples:

[0058] Example 1

[0059] This embodiment is one of the embodiments of the covered yarn and the preparation method thereof of the present invention. In this embodiment, the covered yarn is arranged on the outer surface of the yarn core in a mesh shape, wherein the yarn core is spandex filament.

[0060] Yarn core mass content: 35%; covering yarn mass content: 65%.

[0061] The mass ratio of nylon material and polyester material:

[0062] The mass ratio of nylon material to polyester material in the coated yarn is 1:4, the breaking strength of the coated yarn is not less than 20 cN / tex, and the breaking elongation is controlled at 52%.

[0063] When the yarn core and the covering yarn are pulled and twisted in the equipment, the covering yarn is arranged on the outer surface of the yarn core in a mesh-like manner, and the twist accuracy is 650tpm±10tpm; the spacing between the covering points is adjusted to: 0.5cm.

[0064] Additive content:

[0065] Antibacterial agent: 3%; Flame retardant: 8%; Softener: 2%; Antistatic agent: 0.5%.

[0066] Heat treatment and shaping treatment parameters:

[0067] The coated yarn is heat treated, the heat treatment temperature is controlled at 100°C, and the heat treatment time is controlled at 12 minutes;

[0068] The coated yarn is shaped, the shaping treatment temperature is controlled at 175° C., and the shaping treatment time is controlled at 2.5 minutes.

[0069] The temperature of the warehouse storage environment is controlled at 20℃ and the humidity is controlled at 70%.

[0070] Example 2

[0071] This embodiment is one of the embodiments of the covered yarn and the preparation method thereof of the present invention. In this embodiment, the covered yarn is arranged on the outer surface of the yarn core in a mesh shape, wherein the yarn core is polyester filament.

[0072] Yarn core mass content: 28%; covering yarn mass content: 72%.

[0073] The mass ratio of nylon material and polyester material:

[0074] The mass ratio of nylon material to polyester material in the coated yarn is 1:3, the breaking strength of the coated yarn is not less than 20 cN / tex, and the breaking elongation is controlled at 54%.

[0075] When the yarn core and the covering yarn are pulled and twisted in the equipment, the covering yarn is arranged on the outer surface of the yarn core in a mesh-like manner, and the twist accuracy is 650tpm±10tpm; the spacing between the covering points is adjusted to: 0.6cm.

[0076] Additive content:

[0077] Antibacterial agent: 5%; Flame retardant: 13%; Softener: 3%; Antistatic agent: 1.5%.

[0078] Heat treatment and shaping treatment parameters:

[0079] The coated yarn is heat treated, the heat treatment temperature is controlled at 120°C, and the heat treatment time is controlled at 9 minutes;

[0080] The coated yarn is shaped, the shaping treatment temperature is controlled at 190° C., and the shaping treatment time is controlled at 1.5 minutes.

[0081] The temperature of the warehouse storage environment is controlled at 25°C and the humidity is controlled at 60%.

[0082] Example 3

[0083] This embodiment is one of the embodiments of the covered yarn and the preparation method thereof of the present invention. In this embodiment, the covered yarn is arranged on the outer surface of the yarn core in a mesh shape, wherein the yarn core is a combination of spandex filaments and polyester filaments.

[0084] Yarn core mass content: 42%; covering yarn mass content: 58%.

[0085] The mass ratio of nylon material and polyester material:

[0086] The mass ratio of nylon material to polyester material in the coated yarn is 1:2.5, the breaking strength of the coated yarn is not less than 20 cN / tex, and the breaking elongation is controlled at 52%.

[0087] When the yarn core and the covering yarn are pulled and twisted in the equipment, the covering yarn is arranged on the outer surface of the yarn core in a mesh-like manner, and the twist accuracy is 650tpm±10tpm; the spacing between the covering points is adjusted to: 0.8cm.

[0088] Additive content:

[0089] Antibacterial agent: 8%; Flame retardant: 18%; Softener: 4%; Antistatic agent: 2.5%.

[0090] Heat treatment and shaping treatment parameters:

[0091] The coated yarn is heat treated, the heat treatment temperature is controlled at 150°C, and the heat treatment time is controlled at 5 minutes;

[0092] The coated yarn is shaped, the shaping treatment temperature is controlled at 205° C., and the shaping treatment time is controlled at 30 seconds.

[0093] The temperature of the warehouse storage environment is controlled at 28°C and the humidity is controlled at 50%.

[0094] The high-quality coated yarn product of the present invention has broad application prospects in multiple fields such as clothing, home furnishings, and automobile interiors.

[0095] As described above, the embodiments of the present invention are described above. The preferred embodiments of the present invention are described above. If the preferred implementation methods in each preferred embodiment are not obviously self-contradictory or based on a preferred implementation method, each preferred implementation method can be arbitrarily superimposed and used in combination. The embodiments and specific parameters in the embodiments are only for the purpose of clearly describing the invention verification process of the inventor, and are not used to limit the patent protection scope of the present invention. The patent protection scope of the present invention is still subject to its claims. Any equivalent structural changes made by using the contents of the description and drawings of the present invention should be included in the protection scope of the present invention.

Claims

1. A covered yarn, characterized in that: It comprises a yarn core and a covering yarn, wherein the covering yarn is arranged on the outer surface of the yarn core in a mesh shape to form a covering yarn with a twist of 650 tpm±10 tpm, wherein the mass content of the yarn core in the covering yarn is 28%-42%, and the mass content of the covering yarn is 65%-72%; Wherein, the yarn core is a combination of one or more of steel wire, glass fiber wire, spandex filament or polyester filament; Wherein, the coated yarn comprises nylon material and polyester material, and the mass ratio of the nylon material and the polyester material in the coated yarn is 1:4 to 1:2.5; The breaking strength of the covered yarn formed by the yarn core and the covered yarn is not less than 20 cN / tex, and the breaking elongation is controlled at 52%-56%.

2. A covered yarn according to claim 1, characterized in that: The nylon material and polyester material in the coated yarn are nylon yarn and polyester yarn. After the nylon yarn and polyester yarn are combined, they form outer coated fibers that tightly coat the outer surface of the yarn core. The spacing between the coating points of the nylon yarn and the polyester yarn on the surface of the yarn core is 0.5cm-0.8cm.

3. A covered yarn according to claim 1, characterized in that: A shrink-resistant thread is also arranged between the yarn core and the covering yarn. The shrink-resistant thread is spirally wound on the surface of the yarn core. The covering yarn covers the surface of the yarn core and the shrink-resistant thread. The shrink-resistant thread is used to reduce the size shortening of the covering yarn during weaving and use.

4. A covered yarn according to claim 1, characterized in that: Antibacterial agent, flame retardant, softener and antistatic agent are added to the coated yarn, and the mass percentages of the antibacterial agent, flame retardant, softener and antistatic agent in the coated yarn are 3%-8%, 8%-18%, 2%-4% and 0.5%-2.5% respectively.

5. A method for preparing the covered yarn according to any one of claims 1 to 4, characterized in that: The steps include: S100, raw material preparation and loading, according to the design requirements of the covered yarn, prepare the required raw materials of the yarn core and the covering yarn, place the yarn core and the covering yarn in the covering yarn integrated machine to prepare for covering processing; S200, covering processing, debugging the covering yarn integrated machine, adjusting the pulling speed, twisting degree and covering angle of the covering yarn integrated machine, starting the equipment to start covering processing; S300, post-treatment, heat treatment and shaping treatment are performed on the coated yarn, temperature and time parameters are controlled in the heat treatment and shaping treatment, and the coated yarn is cleaned and arranged to remove impurities and oil stains on the surface; S400, quality inspection, quality inspection of the covered yarn, the inspection indicators include breaking strength, breaking elongation and twist, the inspection requires that the parameter error of each indicator is no more than 2%; S500, packaging and warehousing, sealing the qualified coated yarn, marking the information by attaching labels on them, and sending the packaged coated yarn to the warehouse for storage.

6. The method for preparing the covered yarn according to claim 5, characterized in that: The S100 further includes the following steps: S101, nylon winding, winding the nylon material with a winding machine to form a nylon yarn tube with a required capacity, ensuring that the nylon has no defects such as nodes and broken ends in the subsequent coating process, and then combining the nylon yarn with the polyester yarn in proportion to form a coated yarn; S102, anti-shrinkage pre-treatment, setting the anti-shrinkage thread on the yarn core, ensuring that the tension of the anti-shrinkage thread matches the yarn core, and adjusting the spiral angle and spacing of the anti-shrinkage thread according to product parameter requirements.

7. The method for preparing the covered yarn according to claim 5, characterized in that: The S200 further includes the following steps: S201, when the yarn core and the covering yarn are pulled and twisted in the device, the covering yarn is arranged on the outer surface of the yarn core in a mesh shape to form a covering yarn with a twist of 650 tpm±10 tpm, and the covering point spacing of the covering yarn is adjusted to 0.5 cm-0.8 cm; S202. Add antibacterial agent, flame retardant, softener and antistatic agent to the coated yarn, with the added content of antibacterial agent being 3%-8%, flame retardant being 8%-18%, softener being 2%-4%, and antistatic agent being 0.5%-2.5%.

8. The method for preparing the covered yarn according to claim 5, characterized in that: The S300 specifically includes the following steps: S301, heat treating the coated yarn, wherein the heat treatment temperature is controlled at 100° C.-150° C., and the heat treatment time is controlled at 5 minutes-12 minutes; S302, shaping the coated yarn, controlling the shaping treatment temperature at 175° C.-205° C., and controlling the shaping treatment time at 30 seconds-2.5 minutes.

9. The method for preparing the covered yarn according to claim 5, characterized in that: The breaking strength of the covered yarn formed by the yarn core and the covering yarn in the S400 is not less than 20 cN / tex, and the breaking elongation is controlled at 52%-56%.

10. The method for preparing the covered yarn according to claim 5, characterized in that: In S500, the temperature of the warehouse storage environment is controlled at 20°C to 28°C, and the humidity is controlled at 50% to 70%, and The storage environment should not be exposed to direct sunlight.

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