Multi-gradient-color fabric, covering yarn and preparation method of multi-gradient-color fabric

Abstract

The invention relates to a multi-gradient color covering yarn and a preparation method thereof. Different from the prior art, core yarn of the multi-gradient color covering yarn is POY bar code yarn, and skin yarn of the multi-gradient color covering yarn is POY slub yarn; the dye is prepared by one-bath dyeing. Wherein the core yarn bar code yarn has dark and light colors due to thickness difference, and the skin yarn slub yarn also has dark and light colors due to different densities; due to the fact that the materials of the skin yarn and the core yarn are different, the dyeing effects are different in the same time, and therefore the multi-gradient-color covering yarn comprises four different gradient colors and can be used for weaving gradient-color clothes. Meanwhile, the yarn has special texture feelings of bamboo joints and bar codes, and a garment fabric prepared from the yarn has vivid texture matched with gradient colors, so that a reflective rendering effect can be formed, and a good visual effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of textiles, and in particular to a multi-gradient color fabric, a core-spun yarn and a preparation method thereof. Background Art

[0002] Gradient color fabrics have a gradient color effect on the surface and are becoming more and more popular in the market, meeting the personalized needs of different groups of people.

[0003] At present, in the textile field, the production of general gradient color fabrics is to first dye the yarn, and then arrange the colored yarns of different colors according to the designed pattern for weaving; this method has complex line arrangement and cumbersome steps, and it is not easy to produce a more complex gradient effect. In addition, the dye can be printed on the fabric of the fabric to form a gradient color effect, but the process control of the gradient color printing and dyeing process is complex, and the printing and dyeing effect is relatively rigid. The depth of printing and dyeing is not easy to control, and it is not as natural as the direct dyeing method. In addition, the production method of the above gradient color fabrics is complicated, the dyeing time is long, the water consumption is large, and a large amount of production wastewater is generated, which puts great pressure on the environment. Summary of the invention

[0004] In view of the above problems, the present application provides a multi-gradient color core-spun yarn, wherein the core yarn is a POY barcode yarn, the skin yarn is a POY slub yarn, and the core yarn and the skin yarn are made of different materials; the multi-gradient color core-spun yarn is dyed by a one-bath method. The multi-gradient color core-spun yarn includes 4 different gradient colors and 2 different textures, wherein 2 gradient colors and 1 texture exist on the core yarn and have hidden properties. The yarn itself has a gradient property and can be directly used to weave gradient color fabrics.

[0005] The present application first provides a multi-gradient color core-spun yarn, wherein the core yarn of the core-spun yarn is POY barcode yarn, the skin yarn is POY bamboo yarn, and the core yarn and the skin yarn are made of different materials; the multi-gradient color core-spun yarn is prepared by one-bath dyeing.

[0006] Different from the prior art, a multi-gradient color core-spun yarn has a core yarn of POY barcode yarn and a skin yarn of POY slub yarn; the multi-color core-spun yarn is prepared by one-bath dyeing. The core yarn barcode yarn has light and dark colors due to the difference in thickness, and the skin yarn slub yarn has two colors of light and dark due to the different density; since the skin yarn and the core yarn are made of different materials, the dyeing effect is different in the same time, so the multi-gradient color core-spun yarn presents 4 different gradient colors, and the yarn can be used to weave gradient color clothing. At the same time, the yarn has a special texture of bamboo and barcode, and the fabric prepared by the yarn has a variety of vivid textures with gradient colors, forming various reflective rendering effects, and has a good decorative effect.

[0007] Furthermore, the POY barcode yarn is polyester POY barcode yarn, and the POY slub yarn is nylon POY slub yarn.

[0008] The present application also provides a method for preparing the multi-gradient color core-spun yarn, wherein the equipment used in the preparation method is an air texturing machine, and the method comprises the following steps:

[0009] S1: After the first raw silk is subjected to heat stretching and heat setting at a fixed stretching ratio, bamboo knots are prepared through a fancy device to obtain a POY bamboo knot yarn semi-finished product; after the second raw silk is subjected to heat stretching with a variable stretching ratio and heat setting, a POY barcode yarn semi-finished product is obtained;

[0010] S2: feeding the POY barcode yarn semi-finished product and the POY slub yarn semi-finished product into a nozzle for compounding, and spraying out a core-spun yarn; the core yarn of the core-spun yarn is the POY barcode yarn, and the sheath yarn is the POY slub yarn;

[0011] S3: Dyeing the core-spun yarn using a one-bath process to obtain a core-spun yarn with multiple gradient colors.

[0012] Furthermore, the preparation method is adopted in an air texturing machine, comprising the following steps:

[0013] S1: The nylon raw yarn is overfed by 15%-35%, passed through a first heating roller for a first heat stretching with a fixed stretching ratio, passed through a second heating roller for heat setting, and then passed through a fancy device to prepare slubs to obtain a nylon POY slub yarn semi-finished product; the polyester raw yarn is overfed by 8%-20%, passed through a third heating roller for a second heat stretching with a variable stretching ratio, and then passed through a fourth heating roller for heat setting to obtain a polyester POY barcode yarn semi-finished product;

[0014] S2: feeding the polyester POY barcode yarn semi-finished product and the nylon POY slub yarn semi-finished product into a nozzle for compounding, and spraying out a core-spun yarn; the core yarn of the core-spun yarn is the polyester POY barcode yarn, and the sheath yarn is the nylon POY slub yarn;

[0015] S3: Dyeing the core-spun yarn using a one-bath process to obtain a core-spun yarn with multiple gradient colors.

[0016] Furthermore, the nylon raw yarn is overfed by 15%-20%, and the polyester raw yarn is overfed by 8%-15%.

[0017] Furthermore, the first stretching ratio is 1.75 times.

[0018] Furthermore, the temperature of the first heating roller is set to 95-100°C, and the temperature of the second heating roller is set to 140-150°C.

[0019] Furthermore, in the second heat stretching, the stretching ratio varies between 1.3 and 1.78 times.

[0020] Furthermore, the temperature of the third heating roller is set to 95-100°C, and the temperature of the fourth heating roller is set to 140-150°C.

[0021] Furthermore, the air pressure of the nozzle is set to 8 MPa.

[0022] Furthermore, in the step S2, the nylon raw yarn is overfed by 15%-35%, is subjected to a first heat stretching with a fixed stretching ratio by a first heating roller, is heat-set by a second heating roller, is prepared into bamboo knots by a fancy machine, and is twisted by a false twister to obtain a nylon POY bamboo knot yarn semi-finished product.

[0023] The present application further provides a multi-gradient color fabric, which is woven from the multi-gradient color core-spun yarn.

[0024] Different from the existing technology, the multi-gradient core-spun yarn presents 4 different gradient colors and 2 different patterns. When the yarn is not stretched, the core yarn barcode yarn is covered by the skin yarn slub yarn, and the 2 gradient colors and barcode patterns are hidden; when the yarn has a certain stretch, the gradient color and barcode patterns of the core yarn will appear.

[0025] Therefore, when the fabric is stretched, the clothes will show hidden patterns and gradient colors, which is very design-oriented and meets the personalized pursuit of modern people. Users can also design the weaving process and different stretching ratios to make different parts of the fabric show 2 gradient colors and 1 pattern or 4 gradient colors and 2 patterns, presenting a changing and unified color effect.

[0026] The above-mentioned records related to the invention content are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the written contents of the specification, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the specific implementation methods of the present application are explained below. DETAILED DESCRIPTION

[0027] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments.

[0028] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description in conjunction with the specific embodiments listed. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0029] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0030] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0031] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0032] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0033] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0034] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0035] The present application first provides a multi-gradient color core-spun yarn, wherein the core yarn of the core-spun yarn is POY barcode yarn, the skin yarn is POY bamboo yarn, and the core yarn and the skin yarn are made of different materials; the multi-gradient color core-spun yarn is prepared by one-bath dyeing.

[0036] Different from the prior art, a multi-gradient color core-spun yarn has a core yarn of POY barcode yarn and a skin yarn of POY slub yarn; the multi-gradient color core-spun yarn is prepared by one-bath dyeing. The core yarn barcode yarn has light and dark colors due to the difference in thickness, and the skin yarn slub yarn has two colors of light and dark due to the different density; since the skin yarn and the core yarn are made of different materials, the dyeing effect is different in the same time, so the multi-gradient color core-spun yarn includes 4 different gradient colors, which can be used to weave gradient color clothing. At the same time, the yarn has a special texture of bamboo and barcode, and the clothing fabric prepared by it has a vivid texture with gradient colors, which will form a reflective rendering effect and have a good visual effect.

[0037] Furthermore, the POY barcode yarn is polyester POY barcode yarn, and the POY slub yarn is nylon POY slub yarn.

[0038] Furthermore, the preparation method uses an air texturing machine, which includes the following steps:

[0039] S1: After the first raw silk is subjected to heat stretching and heat setting at a fixed stretching ratio, bamboo knots are prepared through a fancy device to obtain a POY bamboo knot yarn semi-finished product; after the second raw silk is subjected to heat stretching with a variable stretching ratio and heat setting, a POY barcode yarn semi-finished product is obtained;

[0040] S2: feeding the POY barcode yarn semi-finished product and the POY slub yarn semi-finished product into a nozzle for compounding, and spraying out a core-spun yarn; the core yarn of the core-spun yarn is the POY barcode yarn, and the sheath yarn is the POY slub yarn;

[0041] S3: Dyeing the core-spun yarn using a one-bath process to obtain a core-spun yarn with multiple gradient colors.

[0042] Furthermore, the preparation method is adopted in an air texturing machine, comprising the following steps:

[0043] S1: The nylon raw yarn is overfed by 15%-35%, passed through a first heating roller for a first heat stretching with a fixed stretching ratio, passed through a second heating roller for heat setting, and then passed through a fancy device to prepare slubs to obtain a nylon POY slub yarn semi-finished product; the polyester raw yarn is overfed by 8%-20%, passed through a third heating roller for a second heat stretching with a variable stretching ratio, and then passed through a fourth heating roller for heat setting to obtain a polyester POY barcode yarn semi-finished product;

[0044] S2: feeding the polyester POY barcode yarn semi-finished product and the nylon POY slub yarn semi-finished product into a nozzle for compounding, and spraying out a core-spun yarn; the core yarn of the core-spun yarn is the polyester POY barcode yarn, and the sheath yarn is the nylon POY slub yarn;

[0045] S3: Dyeing the core-spun yarn using a one-bath process to obtain a core-spun yarn with multiple gradient colors.

[0046] Furthermore, the design effect can be achieved by adjusting the position of the fancy machine to change the size and length of the yarn slub. Factors that affect the length of the slub include: speed, overfeeding, yarn drawing time, and fancy machine position. The faster the spinning speed, the longer the slub, the larger the overfeeding, the more obvious the slub, the faster the yarn drawing time, the more slub, and the farther the upper and lower holes of the fancy machine are from each other, the larger the slub. Technicians can control the size and length of the slub by adjusting the above indicators, but the larger and more obvious the slub is, the greater the challenge to subsequent garment weaving will be, because it is not easy to unwind, so the above factors must be controlled.

[0047] Furthermore, the nylon raw yarn is overfed by 15%-20%, and the polyester raw yarn is overfed by 8%-15%.

[0048] The larger the overfeed, the better the wool feeling. The present application selects a lower overfeed amount, so that the linear density of the yarn becomes smaller, that is, the accumulation of yarn in a unit area becomes less, avoiding the damage to the yarn structure during the later spraying, and enhancing the overall strength of the yarn.

[0049] Furthermore, the first stretching ratio is 1.75 times.

[0050] Furthermore, the temperature of the first heating roller is set to 95-100°C, and the temperature of the second heating roller is set to 140-150°C.

[0051] Furthermore, in the second heat stretching, the stretching ratio varies between 1.3 and 1.78 times.

[0052] Furthermore, the temperature of the third heating roller is set to 95-100°C, and the temperature of the fourth heating roller is set to 140-150°C.

[0053] Furthermore, the air pressure of the nozzle is set to 8 MPa.

[0054] The nozzle air pressure is set to a low pressure of 8MPa, which can reduce the damage to the yarn structure (mainly the skin yarn) during yarn spraying and enhance the overall strength of the core-spun yarn.

[0055] Furthermore, in the step S2, the nylon raw yarn is overfed by 15%-35%, is subjected to a first heat stretching with a fixed stretching ratio by a first heating roller, is heat-set by a second heating roller, is prepared into bamboo knots by a fancy machine, and is twisted by a false twister to obtain a nylon POY bamboo knot yarn semi-finished product.

[0056] Furthermore, twisting by a two-for-one twister can also increase the strength of the sheath yarn, thereby increasing the overall strength of the core-spun yarn.

[0057] The present application further provides a multi-gradient color fabric, which is woven from the multi-gradient color core-spun yarn.

[0058] Different from the existing technology, the multi-gradient core-spun yarn presents 4 different gradient colors and 2 different patterns. When the yarn is not stretched, the core yarn barcode yarn is covered by the skin yarn slub yarn, and the 2 gradient colors and barcode patterns are hidden; when the yarn has a certain stretch, the gradient color and barcode patterns of the core yarn will appear.

[0059] Therefore, the fabric or clothing woven with this yarn will show hidden patterns and gradient colors when stretched, which is very design-oriented and meets the personalized pursuit of modern people. Users can also design the weaving process and different stretching ratios to make different parts of the fabric or clothing show 2 gradient colors and 1 pattern or 4 gradient colors and 2 patterns, presenting a changing and unified color effect.

[0060] The air texturing machine used in this embodiment is a high-performance air texturing machine of SSM Company, model DP5-TF.

[0061] In this embodiment, the strength index of the core-spun yarn is tested using a fully automatic single yarn strength tester, wherein the clamping length is 500 mm, the speed is 500 mm / min, and the pre-tension is 0.20 cn / dtex.

[0062] Example 1 A multi-gradient color core-spun yarn

[0063] The core yarn of the multi-gradient color core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the skin yarn is 130dtex / 68F nylon POY slub yarn.

[0064] S1: The nylon raw yarn is overfed by 15% (overfeeding time: 0.05s random range 20%); the first heat stretching (yarn drawing time: 0.1s random range 40%) with a stretching ratio of 1.75 is performed by a first heating roller (100°C), heat-set by a second heating roller (150°C), and then a slub is prepared by a fancy device (a single fancy FF3 yarn picker is set to the 6th hole, a fancy upper hole T7 and a lower hole X3, and a traverse of 70mm random range 40%) to obtain a nylon POY slub yarn semi-finished product;

[0065] The polyester raw yarn is overfed by 10% (overfeeding time: 0.05s random range 12%) and passed through the third heating roller (100°C) for the second heat stretching with a variable stretching ratio, and the second heat stretching is set to have a maximum stretching ratio of 1.78 times and a minimum stretching ratio of 1.3 times (maximum to minimum change time: 0.3S, minimum holding time: 4S, time random range: 60%; minimum to maximum change time: 0.5S, maximum holding time: 2S, time random range: 150%), and then passed through the fourth heating roller (150°C) for heat setting to obtain a polyester POY barcode yarn semi-finished product;

[0066] S2: The polyester POY barcode yarn semi-finished product and the nylon POY slub yarn semi-finished product are sent into a nozzle (air pressure 8 MPa, production speed: 300 m / min) for compounding, and the core-spun yarn is sprayed out; the core yarn of the core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the skin yarn is 130dtex / 68F nylon POY slub yarn; the strength index of the core-spun yarn is 2.3cN / dtex.

[0067] S3: dyeing the core-spun yarn with a one-bath method to obtain a multi-gradient core-spun yarn. The core yarn barcode yarn has light and dark colors due to thickness differences, and the skin yarn slub yarn also has two light and dark colors due to different densities; since the skin yarn and the core yarn are made of different materials, the dyeing effects are different in the same time, so there are 4 different gradient colors on the multi-gradient core-spun yarn.

[0068] Example 2

[0069] The core yarn of the multi-gradient color core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the sheath yarn is 140dtex / 36F cationic POY slub yarn.

[0070] S1: cationic material is overfed by 15% (overfeeding time: 0.05s random range 20%); the first heat stretching (yarn drawing time: 0.1s random range 40%) with a stretching ratio of 1.75 is performed by a first heating roller (100°C), heat-set by a second heating roller (150°C), and then a slub is prepared by a fancy device (a single fancy FF3 yarn picker is set to the 6th hole, a fancy upper hole T7 and a lower hole X3, and a traverse of 70mm random range 40%) to obtain a cationic POY slub yarn semi-finished product;

[0071] The polyester raw yarn is overfed by 10% (overfeeding time: 0.05s random range 12%) and passed through the third heating roller (100°C) for the second heat stretching with a variable stretching ratio, and the second heat stretching is set to have a maximum stretching ratio of 1.78 times and a minimum stretching ratio of 1.3 times (maximum to minimum change time: 0.3S, minimum holding time: 4S, time random range: 60%; minimum to maximum change time: 0.5S, maximum holding time: 2S, time random range: 150%), and then passed through the fourth heating roller (150°C) for heat setting to obtain a polyester POY barcode yarn semi-finished product;

[0072] S2: The polyester POY barcode yarn semi-finished product and the cationic POY slub yarn semi-finished product are fed into a nozzle (air pressure 8 MPa, production speed: 300 m / min) for compounding, and the core-spun yarn is sprayed out; the core yarn of the core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the skin yarn is 140dtex / 36F cationic POY slub yarn; the strength index of the core-spun yarn is 1.7 cN / dtex.

[0073] S3: dyeing the core-spun yarn with a one-bath method to obtain a multi-gradient color core-spun yarn. The core yarn barcode yarn has light and dark colors due to thickness differences, and the skin yarn slub yarn also has two colors of light and dark due to different densities; since the skin yarn and the core yarn are made of different materials, the dyeing effects are different in the same time, so the multi-gradient color core-spun yarn includes 4 different gradient colors.

[0074] Example 3

[0075] The core yarn of the multi-gradient color core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the sheath yarn is 140dtex / 36F cationic POY slub yarn.

[0076] S1: cationic material is overfed by 15% (overfeeding time: 0.05s random range 20%); the first heat stretching (yarn drawing time: 0.1s random range 40%) with a stretching ratio of 1.75 is performed by a first heating roller (100°C), heat-set by a second heating roller (150°C), and then a slub is prepared by a fancy device (a single fancy FF3 yarn picker is set to the 6th hole, a fancy upper hole T7 and a lower hole X3, and a traverse of 70mm random range 40%) to obtain a cationic POY slub yarn semi-finished product;

[0077] The polyester raw yarn is overfed by 10% (overfeeding time: 0.05s random range 12%) and passed through the third heating roller (100°C) for the second heat stretching with a variable stretching ratio, and the second heat stretching is set to have a maximum stretching ratio of 1.78 times and a minimum stretching ratio of 1.3 times (maximum to minimum change time: 0.3S, minimum holding time: 4S, time random range: 60%; minimum to maximum change time: 0.5S, maximum holding time: 2S, time random range: 150%), and then passed through the fourth heating roller (150°C) for heat setting to obtain a polyester POY barcode yarn semi-finished product;

[0078] S2: The polyester POY barcode yarn semi-finished product and the cationic POY slub yarn semi-finished product are fed into a nozzle (air pressure 11 MPa, production speed: 300 m / min) for compounding, and the core-spun yarn is sprayed out; the core yarn of the core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the skin yarn is 140dtex / 36F cationic POY slub yarn; the strength index of the core-spun yarn is 1.5 cN / dtex.

[0079] S3: dyeing the core-spun yarn with a one-bath method to obtain a multi-gradient color core-spun yarn. The core yarn barcode yarn has light and dark colors due to thickness differences, and the skin yarn slub yarn also has two colors of light and dark due to different densities; since the skin yarn and the core yarn are made of different materials, the dyeing effects are different in the same time, so the multi-gradient color core-spun yarn includes 4 different gradient colors.

[0080] Example 4 A multi-gradient color core-spun yarn

[0081] The core yarn of the multi-gradient color core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the sheath yarn is 140dtex / 36F cationic POY slub yarn.

[0082] S1: cationic material is overfed by 35% (overfeeding time: 0.05s); the first heat stretching (yarn drawing time: 0.1s, random range 40%) with a stretching ratio of 1.75 is performed by a first heating roller (100°C), heat-set by a second heating roller (150°C), and then a slub is prepared by a fancy device (a single fancy FF3 yarn picker is set to the 6th hole, a fancy upper hole T7 and a lower hole X3, and a traverse of 70mm, random range 40%) to obtain a cationic POY slub yarn semi-finished product;

[0083] The polyester raw yarn is overfed by 10% (overfeeding time: 0.05s) and passed through the third heating roller (100°C) for the second heat stretching with a variable stretching ratio, and the second heat stretching is set to have a maximum stretching ratio of 1.78 times and a minimum stretching ratio of 1.3 times (maximum to minimum change time: 0.3s, minimum holding time: 4s, time random range: 60%; minimum to maximum change time: 0.5s, maximum holding time: 2s, time random range: 150%), and then passed through the fourth heating roller (150°C) for heat setting to obtain a polyester POY barcode yarn semi-finished product;

[0084] S2: The polyester POY barcode yarn semi-finished product and the cationic POY slub yarn semi-finished product are fed into a nozzle (air pressure 11 MPa, production speed: 300 m / min) for compounding, and the core-spun yarn is sprayed out; the core yarn of the core-spun yarn is 140dtex / 72F polyester POY barcode yarn, and the skin yarn is 140dtex / 36F cationic POY slub yarn; the strength index of the core-spun yarn is 1.3cN / dtex.

[0085] S3: dyeing the core-spun yarn with a one-bath method to obtain a multi-gradient color core-spun yarn. The core yarn barcode yarn has light and dark colors due to thickness differences, and the skin yarn slub yarn also has two colors of light and dark due to different densities; since the skin yarn and the core yarn are made of different materials, the dyeing effects are different in the same time, so the multi-gradient color core-spun yarn includes 4 different gradient colors.

[0086] Examples 2-4 show that reducing overfeed and nozzle air pressure is beneficial to maintaining the integrity of the sheath yarn, thereby improving the overall strength of the core yarn.

[0087] Finally, it should be noted that although the above embodiments have been described in the text of the specification of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the text of the specification of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A multi-gradient color core-spun yarn, characterized in that: The core yarn of the core-spun yarn is POY barcode yarn, the skin yarn is POY slub yarn, and the core yarn and the skin yarn are made of different materials; the multi-gradient color core-spun yarn is prepared by one-bath dyeing.

2. The multi-gradient color core-spun yarn according to claim 1, characterized in that: The POY barcode yarn is polyester POY barcode yarn, and the POY slub yarn is nylon POY slub yarn.

3. A method for preparing the multi-gradient color core-spun yarn according to claim 1 or 2, characterized in that: The preparation method uses an air texturing machine, which comprises the following steps: S1: After the first raw silk is subjected to heat stretching and heat setting at a fixed stretching ratio, bamboo knots are prepared through a fancy device to obtain a POY bamboo knot yarn semi-finished product; the second raw silk is subjected to heat stretching with a variable stretching ratio and then heat setting to obtain a POY barcode yarn semi-finished product; S2: feeding the POY barcode yarn semi-finished product and the POY slub yarn semi-finished product into a nozzle for compounding, and spraying out a core-spun yarn; the core yarn of the core-spun yarn is the POY barcode yarn, and the sheath yarn is the POY slub yarn; S3: Dyeing the core-spun yarn using a one-bath process to obtain a core-spun yarn with multiple gradient colors.

4. The preparation method according to claim 3, characterized in that: The preparation method is adopted in an air texturing machine, and comprises the following steps: S1: The nylon raw yarn is overfed by 15%-35%, passed through a first heating roller for a first heat stretching with a fixed stretching ratio, passed through a second heating roller for heat setting, and then passed through a fancy device to prepare slubs to obtain a nylon POY slub yarn semi-finished product; the polyester raw yarn is overfed by 8%-20%, passed through a third heating roller for a second heat stretching with a variable stretching ratio, and then passed through a fourth heating roller for heat setting to obtain a polyester POY barcode yarn semi-finished product; S2: feeding the polyester POY barcode yarn semi-finished product and the nylon POY slub yarn semi-finished product into a nozzle for compounding, and spraying out a core-spun yarn; the core yarn of the core-spun yarn is the polyester POY barcode yarn, and the sheath yarn is the nylon POY slub yarn; S3: Dyeing the core-spun yarn using a one-bath process to obtain a core-spun yarn with multiple gradient colors.

5. The preparation method according to claim 4, characterized in that: The nylon raw yarn is overfed by 15%-20%, and the polyester raw yarn is overfed by 8%-15%.

6. The preparation method according to claim 4, characterized in that: The first stretching ratio is 1.75 times.

7. The preparation method according to claim 4, characterized in that: The temperature of the first heating roller is set to 95-100°C, the temperature of the second heating roller is set to 140-150°C; the temperature of the third heating roller is set to 95-100°C, and the temperature of the fourth heating roller is set to 140-150°C.

8. The preparation method according to claim 4, characterized in that: In the second heat stretching, the stretching ratio varies between 1.3 and 1.78 times.

9. The preparation method according to claim 4, characterized in that: The air pressure of the nozzle was set to 8 MPa.

10. A multi-gradient color fabric, characterized in that: The multi-gradient color fabric is woven from the multi-gradient color core-spun yarn described in claim 1 or 2.