Chemical regenerated yarn of high-elasticity polyester imitating cotton and its production method

Abstract

The application discloses a kind of high-elasticity polyester cotton-like chemical regenerated yarn and production method thereof, select chemical regenerated polyester POY as core yarn, FDY is sheath yarn, POY spinning speed 2800-3000 m / min, elongation 80%-110%, and shrinkage is greater than FDY, utilize the yarn length difference of 20%-33% of supposition formed by spinning speed difference, yarn is prepared by false twist composite processing.POY is matt fiber, FDY is semi-light fiber, and the composite texture of forming outer lubrication and inner dumbness is formed;POY DPF is 0.5-1.5, and FDY DPF is 1.6-2.8, and the bone structure is formed and has anti-pilling and moisture absorption and sweat releasing function;POY and FDY are all T2T chemical method regenerated fiber, and carbon emission is reduced by 60%-85%.The yarn obtained by the application has strong cotton feeling, good elasticity, natural appearance and low carbon environmental protection.

Description

Technical Field

[0001] This invention relates to the field of textile fiber technology, specifically to a polyester cotton-like composite yarn with high elasticity, a strong cotton feel, a natural matte appearance, and made from chemically recycled materials, and its production method. Background Technology

[0002] Fibers made from thermoplastic polymers such as polyester and polyamide possess excellent mechanical properties and dimensional stability, making them widely used in clothing, interior decoration, vehicle interiors, and industrial materials. As the applications of fibers diversify, the requirements for their performance also become increasingly diverse.

[0003] In recent years, the market demand for cotton and cotton-feel clothing has been increasing. However, traditional cotton yarn fabrics are prone to wrinkling, shrinking, and not drying easily, while imitation cotton yarn has moisture-wicking properties, high abrasion resistance, good wrinkle resistance, and basically does not deform after washing.

[0004] To achieve cotton-like characteristics and an appearance close to natural cotton, various technical proposals have been made. For example, the invention patent CN202310336500.1 provides a method for producing cotton-like composite fibers using a false twister. However, the cotton-like yarn produced by this method still has a different feel from that of cotton fibers. Based on this difference in feel, this invention, theoretically speaking, provides a method for producing cotton-like yarn that is more cotton-like and more environmentally friendly.

[0005] Addressing the shortcomings of current cotton-like technologies, this invention provides a processing method for composite cotton-like yarns produced using environmentally friendly recycled materials, which enhances the cotton feel and also possesses elasticity. According to this invention, composite false-twist yarns with excellent moisture-wicking and abrasion resistance, while also achieving a soft surface feel and cotton-like appearance, as well as woven fabrics, knitted fabrics, and garments containing them, can be obtained. Summary of the Invention

[0006] Purpose of the invention: This invention aims to provide a high-elastic polyester cotton-like chemically recycled yarn and its production method, which makes it feel stronger than the cotton-like yarn commonly used on the market, with the softness and skin-friendly characteristics of cotton, and improved comfort; at the same time, it has a natural softness and resilience, and visually close to the matte feel of cotton yarn, and uses chemically recycled materials, which is in line with the concept of environmental protection.

[0007] Technical solution: A method for producing high-elastic polyester cotton-like chemically recycled yarn, using chemically recycled polyester POY as the core yarn and chemically recycled polyester FDY as the sheath yarn; The spinning speed of POY is 2800-3000 m / min, the elongation is 80%-110%, and the shrinkage rate of POY is greater than that of FDY. By utilizing the difference in spinning speed, a differential shrinkage effect with an estimated filament length difference of 20%-33% is formed between POY and FDY. After false twisting composite processing, a composite yarn with cotton feel and elasticity is produced.

[0008] Preferably, the POY is a matte fiber and the FDY is a semi-matte fiber; Matte POY is used as the core yarn to reduce light reflection in the inner layer, creating a matte effect. Semi-dull FDY is used as the sheath yarn to soften the light reflection on the surface, creating a warm luster. This results in a composite texture that is smooth on the outside and matte on the inside, giving the fabric a deep color and a matte appearance similar to natural cotton fibers.

[0009] Preferably, the denier (DPF) of the POY is smaller than that of the FDY. The POY has a DPF of 0.5-1.5, and the FDY has a DPF of 1.6-2.8; The finer POY, used as filling, gives the fabric softness, fluffiness, and drape, while the coarser FDY, used as the skeleton, gives the fabric stiffness and wrinkle resistance, forming a bone and flesh structure with FDY as the bone and POY as the flesh. Furthermore, the POY in the fine DPF is easy to break and fall off during friction, making it less likely to form pills. Combined with the FDY skeleton, it improves the anti-pilling performance. The fine DPF and multiple fine fibers form a capillary effect to achieve the function of moisture absorption and perspiration.

[0010] As a further preferred embodiment, the POY specification is 90D / 72F with a DPF of 1.25; the FDY specification is 70D / 36F with a DPF of 1.94.

[0011] Preferably, both POY and FDY are T2T chemically recycled polyester fibers, which achieve a closed-loop cycle from waste textiles to new textiles through molecular-level decomposition and recombination, reducing carbon emissions by 60%-85%, and the performance of recycled fibers is comparable to that of virgin fibers.

[0012] As a preferred option, the processing flow is as follows: POY passes through the zero and first rollers, while FDY passes through the zero roller, pre-nozzle, first roller, hot box, cooling plate, ceramic disc false twister, second roller, nozzle, third roller, and finally is wound up by the winding drum. The yarn processed by the false twister has a fluffy cotton feel, and the yarn processed after passing through the nozzle has good cohesion, high strength, and small and dense loops.

[0013] Preferably, the speed of the zero roller is 300-700 m / min; the speed ratio of the zero roller to the first roller of the two yarns is 0.8-0.99, so that the POY and FDY between the nozzles are overfed by 1%-20%; The speed ratio between the zeroth roller and the first roller is 1.0-1.1; The speed ratio of the first roller to the second roller is 1.08-1.2; The settling temperature of the hot box is 135-200℃.

[0014] Preferably, the false twister has a D / Y ratio of 1.3-2.5, providing a spring-like full false twist effect; the nozzle network pressure is 0.5-8 bar.

[0015] As a preferred option, the chemically recycled cotton-like DTY produced is one of the following specifications: 40D / 48F, 60D / 72F, 100D / 96F or 150D / 108F. The POY specifications are 30D-150D, fiber count is 5F-216F, and DPF is 0.5-1.5; The FDY has a specification of 30D-150D, a fiber count of 5F-96F, and a DPF of 1.6-2.8; Furthermore, the DPF of the POY is lower than that of the FDY; The POY is a fiber processed by a special spinning process, and both POY and FDY are chemically recycled polyester fibers.

[0016] A high-elastic polyester cotton-like chemically recycled yarn produced by any of the methods described above.

[0017] Beneficial effects: The specific advantages of this invention are as follows: (1) Strong cotton feel: The differential shrinkage effect formed by the difference in spinning speed produces a 20%-33% difference in estimated yarn length, which makes the composite yarn naturally fluffy and softer than ordinary composite yarn, with an extremely strong cotton feel.

[0018] (2) Natural matte appearance: The matte POY core yarn absorbs light, and the semi-gloss FDY sheath yarn softly reflects light, forming a composite texture that is smooth on the outside and matte on the inside. The color is deep and not glaring, and visually close to natural cotton fiber.

[0019] (3) Bone and flesh structure: The coarser FDY provides stiffness and wrinkle resistance, while the finer POY provides softness, fluffiness and drape. Together, they give the fabric a "soft yet firm" feel.

[0020] (4) Anti-pilling: The POY strength of fine DPF is low, and it is easy to break and fall off when rubbed without forming a pill. Combined with the FDY skeleton, the overall anti-pilling performance is excellent.

[0021] (5) Moisture absorption and perspiration: Multiple fine fibers form a capillary effect, which can quickly conduct moisture and improve the comfort of the skin.

[0022] (6) High elasticity: The D / Y ratio of the false twister is 1.3-2.5, which provides sufficient false twist effect, making the yarn have the elasticity of a spring. Combined with the differential shrinkage structure, the elasticity is more durable.

[0023] (7) Environmental protection and low carbon: T2T chemical method is used to regenerate polyester, realizing molecular-level closed-loop recycling of waste textiles, reducing carbon emissions by 60%-85%, saving water resources and energy, and the performance of regenerated fiber is comparable to that of virgin fiber.

[0024] (8) Process stability: By controlling the speed ratio of each roller, overfeed, temperature of the heating box and network air pressure, the yarn cohesion is ensured to be good and the coils are small and dense, so that a variety of specifications of products can be produced stably. Attached Figure Description

[0025] Figure 1 This is a flowchart of the production method of the present invention; Wherein: 1. POY; 2. FDY; 3. First roller; 4. Zero roller; 5. Pre-nozzle; 6. First roller; 7. Hot box; 8. Ceramic disc false twister; 9. Second roller; 10. Nozzle; 11. Third roller; 12. Take-up drum. Detailed Implementation

[0026] Example 1 This embodiment provides a method for producing chemically recycled polyester cotton-like yarn.

[0027] Chemically recycled polyester POY was selected as the core yarn, and chemically recycled polyester FDY as the sheath yarn. The POY is a dull fiber, spun at a speed of 3000 m / min, with an elongation of 170%, a specification of 90D / 72F, and a DPF of 1.25. The FDY is a semi-dull fiber, with a specification of 70D / 36F and a DPF of 1.94. The shrinkage rate of the POY is greater than that of the FDY.

[0028] The difference in spinning speed creates a differential shrinkage effect between POY and FDY, with an estimated filament length difference of 33%. Matte POY, used as the core yarn, reduces light reflection in the inner layer, creating a matte effect. Semi-dull FDY, used as the sheath yarn, softens surface light reflection, creating a warm luster, resulting in a composite texture that is smooth on the outside and matte on the inside. Finer POY (1.25 DPF) acts as filling, giving the fabric softness, fluffiness, and drape, while coarser FDY (1.94 DPF) acts as the skeleton, giving the fabric stiffness and wrinkle resistance, forming a "bony and flesh" structure with FDY as the skeleton and POY as the flesh. The fine DPF POY is easily broken and shed during friction, reducing the likelihood of pilling. Combined with the FDY skeleton, it enhances anti-pilling performance. The fine DPF and multiple fine fibers create a capillary effect, achieving moisture-wicking function.

[0029] Both POY and FDY are T2T chemically recycled polyester fibers. Through molecular-level decomposition and recombination, a closed-loop cycle from waste textiles to new textiles is achieved, reducing carbon emissions by 60%-85%, and the performance of recycled fibers is comparable to that of virgin fibers.

[0030] like Figure 1 As shown, the processing flow in this embodiment is as follows: POY1 passes through roller 3, FDY2 passes through roller 4, pre-nozzle 5, first roller 6, hot box 7, cooling plate, ceramic disc false twister 8, second roller 9, nozzle 10, third roller 11, and finally is wound up by take-up drum 12. The yarn processed by the false twister has a fluffy cotton feel, and the yarn processed after passing through the nozzle has good cohesion, high strength, and small and dense loops.

[0031] The process parameters in this embodiment are as follows: the zero roller speed is 500 m / min; the speed ratio of the zero roller to the first roller of the two yarns is 0.9, so that the POY and FDY between the nozzles are overfed by 10%; the speed ratio of the zero-first roller to the first roller is 1.05; the speed ratio of the first roller to the second roller is 1.14; the setting temperature of the hot box is 180℃; the D / Y ratio of the false twister is 1.8; and the network air pressure of the nozzle is 4 bar.

[0032] The resulting chemically recycled cotton-like DTY yarn has a specification of 80D / 108F. The yarn is soft and fluffy to the touch, with a distinct cotton feel, a lustrous exterior and a matte interior, an elastic recovery rate of ≥85%, a pilling resistance grade of ≥4, and excellent moisture absorption and wicking properties.

[0033] Example 2 This embodiment provides a method for producing chemically recycled polyester cotton-like yarn.

[0034] Chemically recycled polyester POY was selected as the core yarn, and chemically recycled polyester FDY as the sheath yarn. The POY is a dull fiber, spun at a speed of 3700 m / min, with an elongation of 120%, a specification of 60D / 72F, and a DPF of 0.83. The FDY is a semi-dull fiber, with a specification of 50D / 36F and a DPF of 1.39. The shrinkage rate of the POY is greater than that of the FDY.

[0035] By utilizing the difference in spinning speed, a differential shrinkage effect with an estimated filament length difference of 25% is created between POY and FDY. Matte POY, used as the core yarn, reduces light reflection in the inner layer, creating a matte effect. Semi-dull FDY, used as the sheath yarn, softens surface light reflection, creating a warm luster, resulting in a composite texture that is smooth on the outside and matte on the inside. Finer POY, used as filling, imparts softness, fluffiness, and drape to the fabric, while coarser FDY, used as the skeleton, provides stiffness and wrinkle resistance, forming a "bony and flesh" structure with FDY as the skeleton and POY as the flesh. Fine DPF POY is prone to breakage and shedding during friction, reducing the likelihood of pilling. Combined with the FDY skeleton, this enhances anti-pilling performance. The fine DPF and multiple fine fibers create a capillary effect, achieving moisture-wicking functionality.

[0036] Both POY and FDY are T2T chemically recycled polyester fibers, which achieve a closed-loop cycle from waste textiles to new textiles through molecular-level dismantling and recombination, reducing carbon emissions by 60%-85%.

[0037] The processing flow is the same as in Example 1. The process parameters are as follows: the zero roller speed is 400 m / min; the speed ratio of the zero roller to the first roller of the two yarns is 0.85, so that the POY and FDY between the nozzles are overfed by 15%; the speed ratio of the zero roller to the first roller is 1.02; the speed ratio of the first roller to the second roller is 1.10; the setting temperature of the hot box is 160℃; the D / Y ratio of the false twister is 2.0; and the network air pressure of the nozzle is 3 bar.

[0038] The resulting chemically recycled cotton-like DTY is 55D / 108F. The yarn has a strong softness and good drape, and the fabric surface has a natural matte finish and a smooth feel.

[0039] Example 3 This embodiment provides a method for producing chemically recycled polyester cotton-like yarn.

[0040] Chemically recycled polyester POY was selected as the core yarn, and chemically recycled polyester FDY was selected as the sheath yarn. The POY is a dull fiber, spun at a speed of 2800 m / min, with 100% elongation, a specification of 120D / 144F, and a DPF of 0.83. The FDY is a semi-dull fiber, with a specification of 100D / 48F and a DPF of 2.08. The shrinkage rate of the POY is greater than that of the FDY.

[0041] By utilizing the difference in spinning speed, a differential shrinkage effect with an estimated 20% difference in filament length is created between POY and FDY. Matte POY, used as the core yarn, reduces light reflection in the inner layer, resulting in a matte finish. Semi-dull FDY, used as the sheath yarn, softens surface light reflection, creating a warm, lustrous sheen, resulting in a composite texture that is smooth on the outside and matte on the inside. Finer POY, used as filling, imparts softness, fluffiness, and drape to the fabric, while coarser FDY, used as the skeleton, provides stiffness and wrinkle resistance, forming a skeletal structure where FDY forms the bone and POY forms the flesh.

[0042] Both POY and FDY are T2T chemically recycled polyester fibers.

[0043] The processing flow is the same as in Example 1. The process parameters are as follows: the zero roller speed is 650 m / min; the speed ratio of the zero roller to the first roller of the two yarns is 0.95, so that the POY and FDY between the nozzles are overfed by 5%; the speed ratio of the zero roller to the first roller is 1.08; the speed ratio of the first roller to the second roller is 1.18; the setting temperature of the hot box is 200℃; the D / Y ratio of the false twister is 1.5; and the network air pressure of the nozzle is 6 bar.

[0044] The resulting chemically recycled cotton-like DTY is 110D / 192F. The fabric is crisp but not stiff, making it suitable for outerwear, jackets, and other products.

[0045] Comparative Example The cotton-like composite fiber prepared using the method described in CN202310336500.1 was used as a comparative example. Compared with Examples 1-3 of the present invention, the cotton-like silk of the comparative example has a significantly different feel from cotton fiber, lacks the cotton feel, and does not possess the external lustrous and internal matte luster effect and the combination of softness and crispness brought by the bone and flesh structure of the present invention.

[0046] In this invention, POY and FDY are false-twisted simultaneously. The relationship between the POY elongation and the difference in estimated filament length at different spinning speeds is shown in Table 1 below: Table 1. Relationship between POY spinning speed, elongation, and filament length difference.

[0047] The yarn of this invention has a strong cotton feel, good elasticity, a natural matte appearance, is resistant to pilling and fuzzing, absorbs moisture and wicks away sweat, is highly elastic, environmentally friendly and low-carbon, and has stable processing.

Claims

1. A method for producing a high-elastic polyester cotton-like chemically recycled yarn, characterized in that: Chemically recycled polyester POY is selected as the core yarn, and chemically recycled polyester FDY is selected as the sheath yarn; The spinning speed of POY is 2800-3000 m / min, the elongation is 80%-110%, and the shrinkage rate of POY is greater than that of FDY. By utilizing the difference in spinning speed, a differential shrinkage effect with an estimated shrinkage difference of 20%-33% is formed between POY and FDY. After false twisting composite processing, a composite yarn with cotton feel and elasticity is produced.

2. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 1, characterized in that: The POY is a matte fiber, and the FDY is a semi-matte fiber; Matte POY is used as the core yarn to reduce light reflection in the inner layer, creating a matte effect. Semi-dull FDY is used as the sheath yarn to soften the light reflection on the surface, creating a warm luster. This results in a composite texture that is smooth on the outside and matte on the inside, giving the fabric a deep color and a matte appearance similar to natural cotton fibers.

3. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 1, characterized in that: The denier of the POY filament is less than that of the FDY filament; The POY has a denier of 0.5-1.5, and the FDY has a denier of 1.6-2.

8. The finer POY, used as filling, gives the fabric softness, fluffiness, and drape, while the coarser FDY, used as the skeleton, gives the fabric stiffness and wrinkle resistance, forming a bone and flesh structure with FDY as the bone and POY as the flesh. Furthermore, POY with fine monofilament denier is easy to break and fall off during friction, making it less likely to form pills. Combined with FDY skeleton, it improves anti-pilling performance. The fine monofilament denier and multiple fine fibers form a capillary effect to achieve moisture absorption and perspiration function.

4. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 3, characterized in that: The POY specification is 90D / 72F with a DPF of 1.25; the FDY specification is 70D / 36F with a DPF of 1.

94.

5. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 1, characterized in that: Both POY and FDY are T2T chemically recycled polyester fibers, which achieve a closed-loop cycle from waste textiles to new textiles through molecular-level dismantling and recombination, reducing carbon emissions by 60%-85%.

6. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 1, characterized in that: Its processing flow is as follows: POY (1) passes through the zero-first roller (3), FDY (2) passes through the zero-first roller (4), pre-nozzle (5), first roller (6), hot box (7), cooling plate, ceramic disc false twister (8), second roller (9), nozzle (10), third roller (11), and finally passes through the winding drum (12) for winding; Yarn processed by a false twister has a fluffy cotton feel, and yarn processed after passing through a nozzle has good cohesion, high strength, and small and dense loops.

7. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 6, characterized in that: The speed of the zero roller (4) is 300-700 m / min; the speed ratio of the zero roller (4) and the first roller (6) of the two yarns is 0.8-0.99, so that the POY and FDY between the nozzles are overfed by 1%-20%; The speed ratio of the zeroth roller (3) and the first roller (6) is 1.0-1.1; The speed ratio of the first roller (6) to the second roller (9) is 1.08-1.2; The shaping temperature of the hot box (7) is 135-200℃.

8. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 6, characterized in that: The D / Y ratio of the ceramic disc false twister (8) is 1.3-2.5; The network air pressure of the nozzle (10) is 0.5-8 bar.

9. The method for producing high-elastic polyester cotton-like chemically recycled yarn according to claim 6, characterized in that: The chemically recycled cotton-like DTY produced is one of the following specifications: 40D / 48F, 60D / 72F, 100D / 96F or 150D / 108F. The POY specifications are 30D-150D, fiber count is 5F-216F, and DPF is 0.5-1.5; The FDY has a specification of 30D-150D, a fiber count of 5F-96F, and a DPF of 1.6-2.8; Furthermore, the DPF of the POY is lower than that of the FDY; The POY is a fiber processed by a special spinning process, and both POY and FDY are chemically recycled polyester fibers.

10. A high-elastic polyester cotton-like chemically recycled yarn produced by the production method of the high-elastic polyester cotton-like chemically recycled yarn according to any one of claims 1-9.

Images