Nylon / elastic polyester stranded yarn, cotton-like fabric and preparation method of nylon / elastic polyester stranded yarn

Abstract

The invention discloses a chinlon / elastic polyester stranded yarn, a cotton-like fabric and a preparation method of the chinlon / elastic polyester stranded yarn, and belongs to the technical field of textiles. The chinlon / elastic polyester plied yarn is formed by plying and wrapping chinlon yarns and elastic polyester filaments in proportion and comprises core yarns and outer layer wrap yarns wrapping the core yarns, the core yarns are 20D-50D elastic polyester filaments, the mass ratio of the core yarns is 30%-40%, the F number is 12F-48F, and the elongation at break is 30%-60%; the outer layer wrap yarn is 40-75D DTY polyamide yarn, the mass ratio of the outer layer wrap yarn is 60%-70%, the F number is 34-72F, and the elongation at break is 60%-100%. The plied yarn provided by the invention can be made into a cotton-like fabric, a good cotton-like effect is achieved, and the plied yarn has a cool feeling and a quick-drying function and is excellent in wearing comfort.

Description

Technical Field

[0001] The present invention relates to the field of textiles, and in particular to a nylon / elastic polyester twisted yarn, a cotton-like fabric and a preparation method thereof. Background Art

[0002] Chemical fiber materials have good plasticity and durability and are important raw materials for the modern textile industry. Among them, chemical fiber materials with cotton-like effects have good functionality and comfort, and are highly regarded by the market. Cotton fiber has advantages such as good moisture absorption, and pure cotton fabrics have a soft feel and good comfort. Currently, the most common cotton-like textile materials on the market are mainly polyester-like cotton materials or nylon-like cotton materials. Early polyester-like cotton materials mainly used the characteristics of short fibers to imitate the wooly feel of cotton fibers, with a certain cotton-like and dry effect, but their feel was relatively dry and rough, and the finished product quality and wearing comfort were average. Nylon-like cotton materials have higher moisture absorption than polyester materials, with an improved sense of quality and skin-friendly comfort, but they are too soft and droopy.

[0003] To address these issues, existing technologies primarily improve the properties of cotton-like fibers by modifying the fiber fineness and surface treatment of chemical fibers. For example, by modifying the cross-sectional shape and filament fineness of polyester, it can be made more absorbent and soft, improving its feel and dyeing properties, thereby enhancing wearer comfort. Nylon, on the other hand, is typically produced in the form of spandex-coated yarn to improve its elasticity and spinnability. However, these cotton-like technologies still present certain challenges. It is difficult to combine the cool feel of nylon with the dryness of polyester in a cotton-like material, making it difficult to achieve a perfect balance of strength and flexibility. Summary of the Invention

[0004] In view of this, the present invention provides a nylon / elastic polyester plied yarn, a cotton-like fabric and a preparation method thereof. The plied yarn provided by the present invention can be made into a cotton-like fabric, achieving a good cotton-like effect, while also having a cool feeling and quick-drying functions, and being more comfortable to wear.

[0005] The present invention provides a nylon / elastic polyester plied yarn, which is formed by plying and covering nylon filaments and elastic polyester filaments in proportion. The nylon / elastic polyester plied yarn comprises a core yarn and an outer covering yarn covering the core yarn, wherein the core yarn is 20D-50D elastic polyester filament, with a mass proportion of 30%-40%, an F number of 12F-48F, and an elongation at break of 30%-60%; and the outer covering yarn is 40D-75D DTY nylon filament, with a mass proportion of 60%-70%, an F number of 34F-72F, and an elongation at break of 60%-100%.

[0006] In some embodiments of the present invention, during the plying and coating process, the pre-network pressure is 0.8-1.2 bar, the processing temperature of the nylon segment is 155-170°C, the processing temperature of the elastic polyester segment is 115-130°C, the false twist speed ratio is 1.5-1.8, and the network air pressure is 3.0-3.5 bar, ensuring 80-100 network points per meter.

[0007] In some embodiments of the present invention, the elastic polyester filament is a Sorona filament.

[0008] The present invention provides a cotton-like fabric comprising the nylon / elastic polyester twisted yarn described above.

[0009] In some embodiments of the present invention, the imitation cotton fabric is a knitted fabric with a gram weight of 150-180 g / m 2 .

[0010] In some embodiments of the present invention, the imitation cotton fabric is a disperse dyed fabric.

[0011] The present invention provides a method for preparing a cotton-like fabric, comprising the following steps:

[0012] The nylon / elastic polyester plied yarn described above is woven and chemically processed to obtain a cotton-like fabric.

[0013] In some embodiments of the present invention, the chemical processing includes dyeing, and the dyeing is performed using disperse dyes in an alkaline one-bath method with a pH value of 8.0-8.5.

[0014] In some embodiments of the present invention, graded color fixing is further performed after dyeing, and the graded color fixing includes: first washing with 40-50°C clean water, then treating with glacial acetic acid and nylon fixing agent at 80-90°C, and then washing with 40-50°C clean water to obtain the fixed fabric.

[0015] In some embodiments of the present invention, after the graded color fixation, the chemical processing includes setting, the setting temperature is 150-160° C., the time is 28-32 seconds, and the overfeed rate is 8%-10%.

[0016] Among the existing textile materials, there are blended fabrics of nylon and polyester. In addition to the lack of cotton-like function, the biggest problem at present is the solution to the dyeing problem. Polyester is commonly dyed with disperse dyes, and nylon will also be dyed with some disperse dyes. There is no good way to fix the disperse dyes on nylon. The disperse dyes on the finished nylon will be slowly released during use, resulting in poor color fastness to friction and sunlight, making it difficult to meet national standards.

[0017] Compared to existing technologies, this invention utilizes nylon yarn and elastic polyester filament (such as Sorona) of specific specifications, twisted and coated in an optimal ratio to create a nylon / elastic polyester coated yarn. In this invention, the skin-friendly and flexible nylon is used as the outer coating yarn, providing a skin-friendly cotton feel, while the relatively rigid elastic polyester is used as the core yarn, imparting elasticity and support, thereby achieving a cotton-like effect and a structural function that combines both rigidity and flexibility.

[0018] Based on the twisted yarn, the present invention can form a cotton-like fabric that combines the feel of cotton, the coolness of nylon, and the quick-drying properties of polyester, and is a very high-end and comfortable textile clothing material.

[0019] Furthermore, the present invention applies alkaline one-bath dyeing (pH 8.0-8.5) to the cotton-like fabric. By optimizing dyeing processes, the dyeing of disperse dyes to nylon can be inhibited, reducing staining by up to 62%. The finished fabric provided by the embodiments of the present invention not only has a good cotton-like effect, but also combines the cool feel of nylon and the quick-drying function of polyester. It also solves the staining problem of nylon-polyester blends and is very comfortable to wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the plied yarn according to some embodiments of the present invention;

[0021] Figure 2 This is a physical picture of the finished fabric sample of Example 1 of the present invention. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0023] The present invention provides a nylon / elastic polyester plied yarn, which is formed by plying and covering nylon filaments and elastic polyester filaments in proportion. The nylon / elastic polyester plied yarn comprises a core yarn and an outer covering yarn covering the core yarn, wherein the core yarn is 20D-50D elastic polyester filament, with a mass proportion of 30%-40%, an F number of 12F-48F, and an elongation at break of 30%-60%; the outer covering yarn is 40D-75D DTY nylon filament, with a mass proportion of 60%-70%, an F number of 34F-72F, and an elongation at break of 60%-100%.

[0024] The twisted yarn provided by the present invention can be made into cotton-like fabrics, achieving a good cotton-like effect, and also having both a cool feeling and quick-drying functions, which is convenient for application.

[0025] See also Figure 1 , Figure 1 Schematic diagram of the twisted yarn structure according to some embodiments of the present invention, wherein 1 is the core yarn (Sorona filament) and 2 is the outer covering yarn (DTY nylon).

[0026] The nylon / elastic polyester plied yarn provided in the embodiment of the present invention includes a core yarn 1 and an outer covering yarn 2. The core yarn 1 is specifically 20D-50D Sorona filament, and the outer covering yarn 2 is 40D-75D DTY nylon yarn, and the mass percentage of the two is 30-40%:60-70%.

[0027] "Sorona" is the Chinese translation of "Sorona." Sorona polymer is made from two main raw materials: 1,3-propylene glycol (PDO) and terephthalic acid or dimethyl terephthalate (PTA or DMT). PDO is the key raw material, accounting for 37% of the total raw materials, and is environmentally friendly. The present invention is not limited to using Sorona filament as the core yarn; other elastic polyester filaments, such as T800, can also be used.

[0028] The elastic polyester filaments may have specifications of 20D-50D (preferably 30D, 40D, or 50D), a F number of 12F-48F (preferably 12F, 34F, or 48F), and a breaking elongation of 30%-60%. For example, 50D / 48F Sorona may be used.

[0029] Denier (D), also known as denier, refers to the weight in grams of 9,000 meters of yarn or fiber at a specified moisture regain. It is a fixed-length unit; a larger weight indicates a thicker yarn or fiber. It is commonly used to indicate chemical filaments and silk. The F number refers to the number of individual fibers in a filament.

[0030] Nylon (PA), also known as polyamide fiber or nylon, is a general term for thermoplastic resins containing repeating amide groups (-NHCO-) in their molecular chains. The nylon yarn in the present invention is primarily PA6 filament. Nylon DTY, or nylon draw-textured yarn, is produced by continuously or synchronously stretching pre-oriented yarn (POY) in a texturing machine, followed by texturing in a twister to impart a certain degree of elasticity.

[0031] The outer covering yarn, DTY nylon yarn, is available in specifications ranging from 40D to 75D (preferably 50D or 75D), with an F number of 34F to 72F and an elongation at break of 60% to 100%. The nylon and Sorona yarns described in this embodiment are combined in an optimal ratio to create a yarn that is both rigid and flexible, providing a skin-friendly, crisp feel and a perfect blend of the cool feel of nylon and the dryness of polyester.

[0032] In the embodiment of the present invention, nylon yarns of specific specifications and elastic polyester filaments are twisted and covered according to the above-mentioned mass ratio to obtain the twisted yarn. This spinning method generally feeds elastic polyester filaments and DTY nylon yarns into the spinning process, and twists them together in a core-spun manner to produce the nylon / elastic polyester twisted yarn (which can be referred to as core-spun yarn or covered yarn).

[0033] During the ply-wrapping process, the pre-interlacing pressure is 0.8-1.2 bar to enhance fiber cohesion. The processing temperature for the nylon segment is 155-170°C, and the processing temperature for the elastic polyester segment is 115-130°C. Furthermore, the false twist speed ratio is 1.5-1.8, optimizing the curl volume. The interlacing air pressure is 3.0-3.5 bar, ensuring 80-100 interlacing points per meter.

[0034] The present invention provides a cotton-like fabric comprising the nylon / elastic polyester twisted yarn described above. In some embodiments, the cotton-like fabric is a knitted fabric with a gram weight of 150-180 g / m 2 In some other embodiments, the imitation cotton fabric is further a disperse dyed fabric, which has better properties such as color fastness.

[0035] An embodiment of the present invention provides a method for preparing a cotton-like fabric, comprising the following steps:

[0036] The nylon / elastic polyester plied yarn described above is woven and chemically processed to obtain a cotton-like fabric.

[0037] The embodiment of the present invention mainly adopts 28G30 inch double-sided weft knitting machine for knitting; its fabric structure includes but is not limited to double thread structure, and the weight is 160g / m 2 , 170g / m 2 , 180g / m 2 wait.

[0038] After the grey fabric is woven, it is subjected to chemical processing such as dyeing and finishing in the embodiment of the present invention. Preferably, the obtained knitted grey fabric is subjected to degreasing pretreatment and then dyed.

[0039] In the present embodiment, conventional disperse dyes are used to dye grey fabric, preferably using an alkaline one-bath dyeing method with a pH of 8.0-8.5. The dyeing process includes: dyeing at a concentration of 2-3% by weight of the fabric, a dyeing solution with a pH of 8.0-8.5, and a bath ratio of 1:30 (g / L); dyeing is performed at room temperature, heated to 130°C, and maintained at this temperature for 20-60 minutes.

[0040] In some embodiments of the present invention, after dyeing, graded color fixation (washing) is performed. The graded color fixation includes: first washing with 40-50°C clean water, then treating with glacial acetic acid and a nylon color fixative at 80-90°C, and then washing with 40-50°C clean water to obtain a fixed fabric. Specifically, the graded color fixation is performed using multiple washing tanks; the concentration of the glacial acetic acid can be 0.5g / L, and the amount of the nylon color fixative can be 3-5% (to the weight of the fabric). Its chemical composition is an anionic aromatic sulfonic acid color fixative, which is a commercially available color fixative product. The alkaline one-bath dyeing combined with graded color fixation washing described in the embodiments of the present invention can inhibit the dyeing of nylon with disperse dyes, significantly reducing the staining rate.

[0041] In addition, the embodiment of the present invention further performs a setting finishing on the fabric after color fixing. The setting temperature is preferably 150-160°C, the time is 28-32 seconds, and the overfeed rate is 8%-10%, which is conducive to enhancing the fluffy and cotton-like feel.

[0042] The finished fabric obtained in the embodiment of the present invention has a good cotton-like effect, and has both the cool feeling of nylon and the quick-drying function of polyester. At the same time, it has little staining during dyeing and finishing, is of high quality, and is very comfortable to wear.

[0043] In order to better understand the technical content of the present invention, the following specific examples are provided to further illustrate the present invention. Among them, the raw materials of the examples of the present invention are commercially available.

[0044] Example 1

[0045] 1. Ply yarn

[0046] Covering yarn raw material: Nylon 6DTY, 75D / 72F, accounting for 60%, elongation at break 60%; core yarn: Sorona, 50D / 48F, accounting for 40%, elongation at break 30%.

[0047] During the plying and covering process, the pre-network pressure is 0.8-1.2 bar, the processing temperature of the nylon section is 160-170°C, the processing temperature of the elastic polyester section is 120-130°C, the false twist speed ratio is 1.7-1.8, and the network air pressure is 3.0-3.5 bar, ensuring 90 network points per meter.

[0048] 2. Weaving

[0049] Equipment: 28G30 inch double-sided weft knitting machine;

[0050] Structure: double thread structure, weight 180g / m 2 .

[0051] 3. Dyeing and finishing

[0052] a) Pretreatment: Degreasing, the degreasing must be thorough.

[0053] b) Alkaline one-bath dyeing: HA type dispersed navy 2.5% (owf), pH = 8.0-8.5, bath ratio 1:30; heating: room temperature - 130°C (holding temperature for 30 min).

[0054] c) Graded color fixation: Tank 1: clean water at 45°C; Tank 2: 0.5g / L glacial acetic acid + 4% (owf) nylon color fixative (Fastness, anionic aromatic sulfonic acid), temperature 85°C; Tank 3: wash with clean water at 45°C.

[0055] d) Setting: 155℃×30s, overfeed rate 10%.

[0056] Example 2

[0057] The yarn was twisted and coated as in Example 1 to obtain yarn;

[0058] The yarn is woven into a gram weight of 160g / m 2 fabrics;

[0059] The dyeing and finishing process was carried out according to Example 1 to obtain a colored cotton-like fabric.

[0060] The obtained finished fabric samples were subjected to performance tests, and the performance comparison results are as follows; Figure 1 This is a sample diagram of Example 1.

[0061] 1. The fabric was tested according to the American standard AATCC 202-2012 (2020). The tactile results of the embodiment are shown in the following table:

[0062] Table 1 Comparison of touch test of Sorona finished fabric and conventional imitation cotton fabric in Example 1

[0063]

[0064]

[0065] In the table above, the conventional fabric is a cotton-like fabric, the nylon + Sorona version 1 is the nylon / Sorona ply-twisted cotton-like fabric from Example 1, and the nylon + Sorona version 2 is the nylon / Sorona ply-twisted cotton-like fabric from Example 1. It can be seen that the nylon / Sorona ply-twisted fabric performs better in terms of wrinkle recovery, softness score, and smoothness score.

[0066] 2. The functional fabric samples were tested in accordance with national standards, and the test results are as follows: the material has good performance in wear resistance, UV resistance, breathability, cooling feeling, drying speed, and heat shielding.

[0067] Table 2 National standard test results of fabric samples of Example 1

[0068]

[0069]

[0070] 3. Feel:

[0071] The fabric obtained in Example 1 has a cool, comfortable, cotton-like feel, is not stuffy or sticky when worn, has an elegant color, and has a high texture and is very high-end.

[0072] As can be seen from the above embodiments, the present invention adopts nylon yarn and elastic polyester filament (such as Sorona filament) of specific specifications, and wraps them in the optimal ratio to obtain a twisted yarn with a nylon / elastic polyester coating structure. In the present invention, skin-friendly and flexible nylon is used as the outer coating yarn to provide a skin-friendly cotton feel, and relatively rigid elastic polyester is used as the core yarn to impart elasticity and support, thereby achieving a cotton-like effect and a "rigid and flexible" structural function. Based on the twisted yarn, the present invention can form a cotton-like fabric that combines the feel of cotton, the coolness of nylon, and the quick-drying of polyester. It is a very high-end and comfortable textile clothing material. Furthermore, the present invention performs alkaline one-bath dyeing (PH8.0-8.5) on the cotton-like fabric. By optimizing the dyeing process, the disperse dye can be inhibited from dyeing nylon, and the staining rate can be reduced by up to 62%.

[0073] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core ideas. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A nylon / elastic polyester plied yarn, characterized in that: It is formed by plying and covering nylon yarn and elastic polyester filament in proportion, including a core yarn and an outer covering yarn covering the core yarn. The core yarn is 20D-50D elastic polyester filament, with a mass proportion of 30%-40%, an F number of 12F-48F, and an elongation at break of 30%-60%; the outer covering yarn is 40D-75D DTY nylon yarn, with a mass proportion of 60%-70%, an F number of 34F-72F, and an elongation at break of 60%-100%.

2. The nylon / elastic polyester plied yarn according to claim 1, characterized in that: During the plying and covering process, the pre-network pressure is 0.8-1.2 bar, the processing temperature of the nylon segment is 155-170°C, the processing temperature of the elastic polyester segment is 115-130°C, the false twist speed ratio is 1.5-1.8, and the network air pressure is 3.0-3.5 bar, ensuring 80-100 network points per meter.

3. The nylon / elastic polyester plied yarn according to claim 1 or 2, characterized in that: The elastic polyester filament is a Sorona filament.

4. A cotton-like fabric, characterized in that: The invention comprises the nylon / elastic polyester plied yarn according to any one of claims 1 to 3.

5. The imitation cotton fabric according to claim 4, characterized in that: The imitation cotton fabric is a knitted fabric with a gram weight of 150-180g / m 2 .

6. The imitation cotton fabric according to claim 4, characterized in that: The imitation cotton fabric is a disperse dyed fabric.

7. A method for preparing a cotton-like fabric, characterized in that: The following steps are involved: The nylon / elastic polyester plied yarn according to any one of claims 1 to 3 is woven and chemically processed to obtain a cotton-like fabric.

8. The preparation method according to claim 7, characterized in that The chemical processing includes dyeing, which is carried out using disperse dyes in an alkaline one-bath method with a pH value of 8.0-8.

5.

9. The preparation method according to claim 8, characterized in that After dyeing, graded color fixing is performed, which includes: first washing with 40-50°C clean water, then treating with glacial acetic acid and nylon color fixing agent at 80-90°C, and then washing with 40-50°C clean water to obtain the fixed fabric.

10. The preparation method according to claim 9, characterized in that After the graded color fixation, the chemical processing includes setting, the setting temperature is 150-160° C., the time is 28-32 seconds, and the overfeed rate is 8%-10%.

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