Production process of colored core-spun yarn dyed by cheese

Abstract

The invention discloses a production process of colored core-spun yarn dyed by cheese, and belongs to the technical field of core-spun yarn production. Comprising the following steps that (1) yarn spinning is conducted, specifically, bulked fibers and thermal shrinkage type fibers are selected as raw materials and spun into covering yarn through a vortex spinning technology, and the mass ratio of the bulked fibers to the thermal shrinkage type fibers is 70-85%: 15-30%; (2) spooling: rewinding the covering yarns on a loose spooling machine by adopting a loose spooling process; and (3) cheese dyeing: feeding the bobbin subjected to loose spooling treatment into a dye vat for cheese dyeing to obtain the colored covering yarn, the covering yarn comprises at least two components, one component is fluffy when heated, the other component is shrunk when heated, the stability of the covering yarn can be kept during high-temperature dyeing of the bobbin by adjusting the proportion of the two components, and the color of the covering yarn is improved. The problem that the conventional elastic core-spun yarn shrinks after being heated and cannot be directly dyed by a bobbin is solved.

Description

Technical Field

[0001] This invention relates to a production process for colored core-spun yarn using dyed yarn packages, belonging to the field of core-spun yarn production technology. Background Technology

[0002] Existing core-spun yarns are generally composed of core yarn and outer yarn. The core yarn is usually made of off-white yarn, while the outer yarn is made of colored yarn, thus creating a style where the outer yarn and core yarn present different colors.

[0003] For example, CN103556331A obtains rabbit hair-style vortex-spun yarn by pre-blending, pre-drawing, and vortex spinning of unbleached polyester, colored viscose fiber, and colored Tencel.

[0004] CN102995176A describes the process of blending pretreated dyed viscose fiber, Tencel, wool, and silk in a certain proportion, followed by blending, opening, carding, drawing, and vortex spinning to obtain a multi-component full-color vortex-spun yarn product.

[0005] The core yarns of the aforementioned core-spun yarns are mostly white cores or other undyed yarns, resulting in relatively dull colors in applications and limited color effects on the fabric.

[0006] Therefore, in its earlier patent application CN120465166A, "A Core-Spun Yarn and Its Preparation Method and Application," the applicant included a core yarn and a sheath yarn. The core yarn was a natural-colored filament or a colored filament, and the sheath yarn was a natural-colored short fiber or a colored short fiber. The two were vortex-spun to form a core-spun yarn with a sheath-core structure. This application not only gives the core-spun yarn a good wrapping effect but also introduces elasticity and color effects. By combining different raw materials and proportions of the core yarn and the sheath yarn, the yarn can be given a variety of dazzling styles, which can meet the needs of various application environments.

[0007] As mentioned earlier, the outer yarn and core yarn of the aforementioned core-spun yarn are dyed separately and then spun into yarn using a conventional spinning process. Instead of dyeing the core-spun yarn in packages, the dyeing process is different. The reason for this is that, taking spandex core-spun yarn as an example, during package dyeing, the spandex fibers shrink drastically under high temperatures, increasing the density and hardening of the entire package. This prevents the dye liquor from penetrating the package, leading to problems such as incomplete dyeing and uneven color distribution.

[0008] Currently, some manufacturers also use the loose winding method to release the stress of the yarn package, such as the "Dyeing Method for Cotton-Nylon Core-Spun Spandex Yarn Packages" in CN108625198A. This method involves first winding the yarn in a loose shell with a large diameter, and then using a mechanical extrusion device to extrude and replace the loose shell with a loose shell with a small diameter to obtain loose yarn packaged on a small diameter loose shell. However, the loose winding method has limited stress release and still cannot fundamentally solve the problem of uneven and thorough dyeing when dyeing core-spun yarn packaged. Summary of the Invention

[0009] The purpose of this invention is to provide a simple and uniform dyeing process for producing colored core-spun yarn using yarn cones.

[0010] The technical solution adopted in this invention is as follows: A production process for colored core-spun yarn using dyed yarn packages includes the following steps: (1) Yarn spinning The bulky fiber and heat-shrinkable fiber are selected as raw materials and spun into core-spun yarn using vortex spinning technology. The mass ratio of bulky fiber to heat-shrinkable fiber is 70-85%:15-30%.

[0011] Preferably: The expanded fiber refers to a fiber that expands when heated, preferably a fiber with an expansion rate (expansion degree) of 10%-30%.

[0012] The bulked fiber is selected from a single bulked acrylic fiber or a composite of it with other fibers. Preferably, it is a single bulked acrylic fiber with an expansion rate of 15-20%, or a composite of the bulked acrylic fiber with cellulose fibers such as lyocell fiber or hemp fiber.

[0013] The heat-shrinkable fiber refers to a fiber that shrinks when heated, preferably a fiber with a shrinkage rate of 5%-20%. Spandex fiber with a shrinkage rate of 10-15% is particularly preferred.

[0014] In step (1): the core-spun yarn is heat-shrinkable fiber and the outer yarn is bulky fiber.

[0015] Particularly preferred is the core yarn, which is made of spandex filament with a shrinkage rate of 12%. The outer yarn is a composite of bulked acrylic fiber with an expansion rate of 18%, lyocell fiber, and hemp fiber, wherein the ratio of bulked acrylic fiber:lyocell fiber:hemp fiber is 60%:20%:20%. The ratio of the core yarn to the outer yarn satisfies 25:75.

[0016] The expansion rate and shrinkage rate of fibers referred to in this invention are those tested or labeled in accordance with relevant national or industry standards, such as GB / T6505-2017 and FZ / T 50041-2020.

[0017] This invention avoids the problem of heat shrinkage in core-spun yarn during package dyeing by rationally configuring the core yarn and outer yarn of the core-spun yarn. Specifically, when the core yarn is made of spandex fiber with a high shrinkage rate, the outer yarn is made of bulk acrylic fiber with a high expansion rate. During high-temperature dyeing of packaged yarn, the spandex fiber will shrink, while the bulk acrylic fiber will expand. By rationally setting the ratio of the two, this shrinkage and expansion can be effectively offset, thereby maintaining the stability of the core-spun yarn and eliminating the problem of inconsistent dyeing of packaged yarn caused by the shrinkage or expansion of the core-spun yarn due to high temperature.

[0018] (2) Winding tube The loose winding process is used, in which the core-spun yarn is wound onto a loose winding machine. After loose winding, the yarn bobbin diameter increases by 1-3 cm, and the yarn bobbin density decreases by 0.1-0.35 g / cm³. 3 .

[0019] Preferably: Before pouring: The cylinder diameter is 14.0 cm, and the density is 0.58 g / cm³. 3 .

[0020] After inverting the cylinder: the cylinder diameter is 16.5 cm, and the density is 0.25 g / cm³. 3 .

[0021] By using a loose winding process, the density of the yarn bobbin can be reduced, making the fibers more loose and allowing for certain gaps. The advantages of this are: 1. It provides sufficient space for the expansion and contraction of fibers during subsequent high-temperature dyeing of the yarn bobbin; 2. In the next dyeing process, the dye liquor can more easily enter the fiber gaps inside the yarn bobbin, ensuring uniform dyeing of the inner and outer fibers and avoiding serious color differences between the inside and outside of the yarn bobbin.

[0022] (3) Dyeing of yarn packages The dyeing process employs a two-stage dyeing technique, in which the first dyeing uses cationic dyeing and the second dyeing uses reactive dyes.

[0023] The dyeing process is as follows: 3.1 Pre-processing Pretreatment process: Add 1-2 g / L of degreasing agent, control the bath ratio to 1:8-10, heat the working solution to 40-60℃, keep it at that temperature for 10-30 minutes, drain the solution, and wash with water.

[0024] 3.2 Staining The dyeing process employs an over-dyeing technique, wherein the first dyeing uses cationic dyeing, and the second dyeing uses reactive dyes. 3.2.1 First staining dye: Cationic Blue X-BL 1.0-1.5% owf.

[0025] Cationic Yellow X-GL 0.2-0.8% owf.

[0026] Cationic Red X-GRL 0.5-1.0% owf.

[0027] Leveling agent 0.1-0.2% owf.

[0028] pH value: 3.5-4.2.

[0029] Bath ratio: 1:8-10.

[0030] Process flow: Add acetic acid at 40-60℃ to adjust the pH value to 3.5-4.2, then add cationic dye and leveling agent, run for 10-30 minutes, raise to 95-100℃ at 1-1.5℃ / min, and keep warm for 50-60 minutes.

[0031] Post-treatment: First wash with water, then soap at 60-70℃ for 10-15 minutes with 1.0-1.5 g / L of soaping agent; then perform color fixing and softening treatment.

[0032] 3.2.2 Second staining Dye: Reactive Black W-NN 3-8% owf.

[0033] Additives: Sodium sulfate 20-40g / l, soda ash 10-20g / l.

[0034] pH value: 10.5-11.5.

[0035] Bath ratio: 1:8-10.

[0036] Process flow: Add reactive dye at 30-40℃, run for 10-15 minutes, then add sodium sulfate, run for 10-15 minutes, then raise the temperature to 50-60℃ at 1-1.5℃ / min, run for 15-30 minutes, then add soda ash in 3 portions, and then keep warm for 50-60 minutes.

[0037] Post-treatment: Neutralize with acetic acid for 10-15 minutes, then soap for 15-30 minutes with 1-2 g / L soaping agent, followed by color fixing and softening treatment.

[0038] The beneficial effects of this invention are as follows: (1) Design of core-spun yarn raw materials By designing the raw materials for the core yarn and the outer yarn, and combining this with vortex spinning technology, this invention prepares a core-spun yarn suitable for dyeing packaged yarns. This core-spun yarn contains at least two components: when the core yarn uses spandex fiber with a high shrinkage rate, the outer yarn uses bulked acrylic fiber with a high expansion rate. During high-temperature dyeing of packaged yarns, the spandex fiber shrinks, while the bulked acrylic fiber expands. By rationally setting the ratio of the two components, this shrinkage and expansion can be effectively offset, thereby maintaining the stability of the core-spun yarn and eliminating the problem of inconsistent dyeing of packaged yarns caused by the shrinkage or expansion of the core-spun yarn due to high-temperature heating.

[0039] (2) Winding and dyeing process design This invention employs a loose winding method, solving the problem of uneven dyeing inside and outside the yarn package. Simultaneously, by optimizing the yarn package dyeing process, a two-stage dyeing process is adopted, where the first dyeing uses cationic dyeing, and the second dyeing uses reactive dyeing. Ultimately, a yarn package dyeing process suitable for core-spun yarn is designed. This process solves the problem of dyeing consistency in yarn packages, achieving the effect of skein yarn dyeing. However, compared to skein yarn dyeing, it eliminates the two steps of converting yarn packages into skeins and then back into yarn packages, reducing costs, saving energy, and minimizing pollution. Attached Figure Description

[0040] Figure 1 The product comparison is between the bulked acrylic / spandex black core-spun yarn prepared in Example 1 and the conventional spandex black core-spun yarn prepared in Comparative Example 1. in: Figure 1 a is the conventional black spandex core-spun yarn prepared in Comparative Example 1. Figure 1 b is the expanded acrylic / spandex composite black core-spun yarn prepared in Example 1. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments, but this does not constitute a limitation on the present invention. Unless otherwise specified, the raw materials and reagents used in the embodiments are all existing technologies in the field or commercially available products.

[0042] Example 1

[0043] This embodiment mainly describes the preparation of bulked acrylic / spandex composite black core-spun yarn, including the following steps: 1. Yarn spinning The core yarn and the outer yarn are configured at a mass ratio of 25:75, and then spun into bulk acrylic composite / spandex core-spun yarn using a vortex spinning process.

[0044] Core yarn: Select 75D spandex filament with a shrinkage rate of 12%.

[0045] Leather yarn: Select bulked acrylic fiber with an expansion rate of 18%. The bulked acrylic fiber is compounded with lyocell fiber and hemp fiber, wherein the ratio of bulked acrylic fiber: lyocell: hemp is 60%: 20%: 20%.

[0046] Vortex spinning process: The core yarn and the outer yarn are mixed at a mass ratio of 25:75 and fed into the feed inlet of an air-jet vortex spinning machine (Murata 870 vortex spinning machine) for air-jet vortex spinning. The process configuration for air-jet vortex spinning is as follows: spandex filaments are fed into the core tube of the air-jet vortex spinning machine to form the core yarn, the spinning speed is 350m / min, the back draft is 2.5 times, the main draft is 25 times, the traverse angle is 14 degrees, and the feed ratio is 0.95. The bulked acrylic composite fiber is fed in from the outside of the core yarn. Under the action of the vortex airflow, the bulked acrylic composite fiber spirally wraps around the outside of the core yarn to form the outer yarn. The outer yarn and the core yarn constitute the bulked acrylic composite / spandex core-spun yarn.

[0047] 2. Winding The loose winding process is used to rewind the expanded acrylic composite / spandex core-spun yarn on a loose winding machine.

[0048] Machine type: Loose winding machine.

[0049] Before pouring: The cylinder diameter is 14.0 cm, and the density is 0.58 g / cm³. 3 .

[0050] After inverting the cylinder: the cylinder diameter is 16.5 cm, and the density is 0.25 g / cm³. 3 .

[0051] 3. Dyeing of yarn packages A bulked acrylic / spandex composite black core-spun yarn was prepared using a package dyeing process.

[0052] Dyeing process flow: pretreatment, dyeing, posttreatment.

[0053] 3.1 Pre-processing Pretreatment process: Add 1 g / L of degreasing agent, control the bath ratio to 1:8, heat the working solution to 50℃, keep it at that temperature for 20 minutes, drain the solution, and wash with water.

[0054] Degreasing agent formulation: TF-129 (Zhejiang Chuanhua) is selected as the degreasing agent, with a dosage of 1 g / L. The purpose of adding the degreasing agent is to remove spinning oil, improve fiber wettability, and enhance the uniformity of subsequent dyeing.

[0055] 3.2 Staining The dyeing process employs a two-stage dyeing technique, in which the first dyeing uses cationic dyeing and the second dyeing uses reactive dyes.

[0056] 3.2.1 First staining dye: Cationic Blue X-BL 1.1% owf.

[0057] Cationic Yellow X-GL 0.5% owf.

[0058] Cationic Red X-GRL 0.8% owf.

[0059] Cationic (acrylic) leveling agent 0.1% owf.

[0060] pH value: 4.0.

[0061] Bath ratio: 1:8.

[0062] Process flow: Add acetic acid at 50℃ to adjust the pH value to 4.0, add cationic dye and leveling agent, run for 10 minutes, raise to 100℃ at 1℃ / min, keep warm for 60 minutes, cool to 60℃ and drain.

[0063] Post-treatment: First, wash with water for 10 minutes, then soap at 70℃ for 15 minutes, and then perform color fixing and softening treatment.

[0064] Soap washing formula: 209 detergent 1.5 g / L.

[0065] 3.2.2 Second staining Dye: Reactive Black W-NN, dye dosage 4% owf.

[0066] Additives: 30g / L sodium sulfate, 15g / L soda ash.

[0067] pH value: 11.

[0068] Bath ratio: 1:10.

[0069] Process flow: Add reactive dye at 30℃, run for 10 minutes, then add sodium sulfate, run for 10 minutes, then raise the temperature to 60℃ at 1℃ / min, run for 15 minutes, then add soda ash in 3 portions, and then keep warm for 60 minutes.

[0070] Post-treatment: Neutralize with acetic acid for 10 minutes, then soap for 15 minutes, followed by color fixing and softening treatment.

[0071] Soap washing formula: AST detergent (Nanjing Jiahe Chemical) 2 g / L.

[0072] Example 2

[0073] To test the effect of different core yarn to leather yarn ratios on the dyeing effect of core-spun yarn, the following experiment was conducted.

[0074] The process steps are the same as in Example 1, except that the ratio of core yarn to outer yarn in the core-spun yarn is adjusted and its effect on the dyeing effect of the core-spun yarn is tested.

[0075] The dyeing effect was mainly evaluated by color difference ΔE and color fastness, which included tests for wash fastness and rubbing fastness. The results are shown in Table 1.

[0076] Table 1 .

[0077] analyze: The applicant discovered through experiments that the ratio of core yarn to outer yarn has a significant impact on the dyeing effect in packaged yarn dyeing. The reason for this is likely as follows: During cationic dyeing, the dyeing temperature is relatively high (100℃). At this temperature, spandex fibers shrink due to heat, while the outer yarn, a composite of bulked acrylic fibers, lyocell fibers, and hemp fibers, expands. When the ratio is appropriate, the expansion of the bulked acrylic fibers and the shrinkage of the spandex fibers counteract each other during high-temperature dyeing, thus maintaining the stability of the core-spun yarn dyeing. This solves the problem of conventional spandex core-spun yarn shrinking due to heat and being unsuitable for direct dyeing in packages. On the other hand, the proportion of spandex in the core yarn should not be too high. An excessively high proportion of spandex can lead to "core exposure," affecting the dyeing and appearance of the core-spun yarn. Furthermore, an excessively high spandex proportion can cause the shrinkage rate of the packaged yarn to exceed its expansion rate, resulting in incomplete and uneven dyeing during packaged yarn dyeing, leading to a significant decrease in color difference and color fastness. Experiments have shown that when the ratio of core yarn to leather yarn is 25:75, the best dyeing effect can be obtained by selecting 75D spandex filament with a shrinkage rate of 12% for the core yarn and bulked acrylic fiber with an expansion rate of 18% combined with lyocell fiber and hemp fiber for the leather yarn.

[0078] Comparative Example 1

[0079] This embodiment mainly focuses on the preparation of ordinary spandex black core-spun yarn, with Example 1 as a control. The preparation method is the same as that in Example 1, except that in the yarn spinning of step 1, the outer yarn is not made of bulky acrylic fiber, but is made of ordinary acrylic fiber instead. The other processes and parameters are the same as those in Example 1.

[0080] Comparison of effects: Please refer to Figure 1 As shown: Figure 1 a is the conventional black spandex core-spun yarn prepared in Comparative Example 1. Figure 1b represents the bulked acrylic / spandex composite black core-spun yarn prepared in Example 1. Spandex black core-spun yarn prepared using ordinary acrylic fibers suffers from problems such as "core exposure" and "color unevenness" because spandex shrinks during the dyeing process, preventing the yarn from being fully dyed. However, the bulked acrylic / spandex composite black core-spun yarn prepared in Example 1 of this invention solves the problem of heat shrinkage in conventional spandex core-spun yarn, allowing for "fully and evenly dyed" results in significantly improved dyeing uniformity. This invention effectively solves the problem that conventional spandex core-spun yarn cannot be directly dyed in packages.

[0081] The above embodiments are merely illustrative examples of the inventive concept and do not constitute a limitation on the scope of protection of the present invention. The scope of protection of the present invention shall be determined by the scope of protection set forth in the claims.

Claims

1. A production process for colored core-spun yarn using dyed yarn packages, characterized in that, Includes the following steps: (1) Yarn spinning: Bulky fiber and heat-shrinkable fiber are selected as raw materials and spun into core-spun yarn using vortex spinning process. The mass ratio of bulky fiber to heat-shrinkable fiber is 70-85:15-30. (2) Winding tube: The loose winding process is used to rewind the core-spun yarn onto the loose winding machine; (3) Dyeing of yarn packages: After being loosely wound, the yarn bobbins are sent to a dyeing vat for dyeing to obtain colored core-spun yarn.

2. The production process of colored core-spun yarn using dyed yarn packages according to claim 1, characterized in that: In step (1): the expanded fiber refers to a fiber with an expansion rate of 10%-30%.

3. The production process of colored core-spun yarn using dyed yarn packages according to claim 2, characterized in that: In step (1): the bulked fiber is selected from a single bulked acrylic fiber or a composite of it with other fibers.

4. The production process of colored core-spun yarn using dyed yarn packages according to claim 3, characterized in that: In step (1): the bulked fiber is selected from a single bulked acrylic fiber with an expansion rate of 15-20%, or a composite of the bulked acrylic fiber with lyocell fiber and hemp fiber.

5. The production process of colored core-spun yarn dyed from packaged yarn according to claim 1, characterized in that: In step (1): the heat-shrinkable fiber is selected from fibers with a shrinkage rate of 5%-20%.

6. The production process of colored core-spun yarn dyed from packaged yarn according to claim 5, characterized in that: In step (1): the heat-shrinkable fiber is selected from spandex fiber with a shrinkage rate of 10-15%.

7. The production process of colored core-spun yarn dyed from packaged yarn according to claim 1, characterized in that: In step (1): the core yarn is heat-shrinkable fiber and the outer yarn is bulky fiber, and the ratio of the core yarn to the outer yarn satisfies 25:

75.

8. The production process of colored core-spun yarn dyed from packaged yarn according to claim 1, characterized in that: Step (2) Loose winding process: The core-spun yarn is rewinded on a loose winding machine. After loose winding, the yarn bobbin diameter increases by 1-3 cm, and the yarn bobbin density decreases by 0.1-0.35 g / cm³. 3 .

9. The production process of colored core-spun yarn using dyed yarn packages according to claim 1, characterized in that: The dyeing of the yarn package in step (3) adopts an over-dyeing process, wherein the first dyeing is cationic dyeing and the second dyeing is reactive dyeing.

10. The production process of colored core-spun yarn dyed from packaged yarn according to claim 1, characterized in that: The dyeing of the yarn package in step (3) is as follows: 3.1 Pre-processing Pretreatment process: Add 1-2 g / L of degreasing agent, control the bath ratio to 1:8-10, heat the working solution to 40-60℃, keep it at that temperature for 10-30 minutes, drain the solution, and wash with water; 3.2 Staining The dyeing process employs an over-dyeing technique, wherein the first dyeing uses cationic dyeing, and the second dyeing uses reactive dyes. 3.2.1 First staining dye: Cationic Blue X-BL 1.0-1.5% owf; Cationic Yellow X-GL 0.2-0.8% owf; Cationic Red X-GRL 0.5-1.0% owf; Leveling agent 0.1-0.2% owf; pH value: 3.5-4.2; Bath ratio: 1:8-10; Process flow: Add acetic acid at 40-60℃ to adjust the pH value to 3.5-4.2, then add cationic dye and leveling agent, run for 10-30 minutes, raise to 95-100℃ at 1-1.5℃ / min, and keep warm for 50-60 minutes; Post-treatment: First wash with water, then soap at 60-70℃ for 10-15 minutes with 1.0-1.5 g / L of soaping agent, followed by color fixing and softening treatment; 3.2.2 Second staining Dye: Reactive Black W-NN 3-8% owf; Additives: Sodium sulfate 20-40g / L, soda ash 10-20g / L; pH value: 10.5-11.5; Bath ratio: 1:8-10; Process flow: Add reactive dye at 30-40℃, run for 10-15 minutes, then add sodium sulfate, run for 10-15 minutes, then raise the temperature to 50-60℃ at 1-1.5℃ / min, run for 15-30 minutes, then add soda ash in 3 portions, and then keep warm for 50-60 minutes. Post-treatment: Neutralize with acetic acid for 10-15 minutes, then soap for 15-30 minutes with 1-2 g / L soaping agent, followed by color fixing and softening treatment.

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