A core-spun yarn with moisture-sensitive shape memory effect and preparation method thereof

Abstract

The present invention discloses a core-spun yarn with a moisture-sensitive shape memory effect. The core-spun yarn utilizes a hydrophilic fiber filament bundle with a certain twist as the core layer and a low-melting-point hydrophobic polyester staple fiber as the sheath layer. After heat processing during the spinning process, the sheath fibers melt and bond with the core fibers, solidifying the yarn's twisted structure. When exposed to moisture, the core layer absorbs water, expands, and untwists and rotates, driving the sheath layer to untwist and rotate. When the yarn returns to dryness, the sheath layer drives the core layer back to its twisted state. Based on the differential moisture absorption and swelling of the two materials and the structural combination of the twisted core layer and solidified sheath layer of the core-spun yarn, the core-spun yarn exhibits moisture sensitivity and shape memory properties. The core-spun yarn is produced using jet vortex spinning technology, resulting in high spinning efficiency, high yarn strength, and excellent wear resistance. Fabrics woven with this core-spun yarn have a smooth surface and excellent pilling resistance. After wrinkling or deformation, they return to their original shape after drying with a simple moisture stimulus.

Description

Technical Field

[0001] The invention relates to a core-spun yarn with a moisture-sensitive shape memory effect and a preparation method thereof, and belongs to the field of spinning. Background Art

[0002] Core-spun yarn, also known as composite yarn or covered yarn, is a new type of yarn composed of two or more fibers. It leverages the excellent physical properties of the core filament yarn and the performance and surface characteristics of the outer staple fibers, fully leveraging the strengths of both fibers while compensating for their deficiencies. For example, polyester-cotton core-spun yarn leverages the strengths of polyester filament—its stiffness, wrinkle resistance, and quick washability—while also leveraging the outer cotton fibers' excellent moisture absorption, low static charge, and resistance to pilling. Core-spun yarn also reduces fabric weight while maintaining or improving fabric properties, and leverages the different chemical properties of the core filament and outer staple fibers.

[0003] Air-jet vortex spinning technology is a new spinning method that uses a fixed vortex spinning tube to replace the high-speed rotating spinning cup for spinning. Air-jet vortex spinning technology has the remarkable characteristics of fast spinning speed, short spinning process, small footprint and high degree of automation. The vortex spinning yarn produced has low hairiness (hair longer than 3mm is almost zero), high wear resistance and anti-pilling.

[0004] So far, some have used air-jet vortex spinning technology to prepare wear-resistant core-spun yarn (CN202210124435.1), long-lasting antibacterial core-spun yarn (CN202110313152.7), flame-retardant core-spun yarn (CN201810789516.7), and moisture-absorbing and quick-drying core-spun yarn (CN201922352962.4). Most of these use a core-spun yarn structure in which the core fibers are parallel and straight, and the skin layer is wrapped to form a shape. Research on shape memory properties is relatively limited. In addition, some have used alloy wire (CN201610649764.2) and thermosensitive polyurethane (CN201720391994.3) as the core layer to prepare core-spun yarns with shape memory functions, but their raw materials and processing equipment are not universal.

[0005] Therefore, it is necessary to invent a novel shape memory core-spun yarn to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a core-spun yarn with a moisture-sensitive shape memory effect and a preparation method thereof. After wrinkling and deformation, the core-spun yarn and its fabric only need simple wet stimulation and can restore their original shape after drying. The raw materials are widely available, the operation is simple, and the practicability is strong.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A core-spun yarn with a moisture-sensitive shape memory effect, comprising:

[0009] The core layer is arranged at the center of the core-spun yarn, and uses a hydrophilic fiber filament bundle as the core yarn bundle. The core yarn bundle needs to be twisted by a pre-twisting device, and the twist range is 100 to 1000 twists / m;

[0010] The skin layer is wrapped around the outer periphery of the core layer and is made of hydrophobic low-melting-point polyester staple fibers as outer covering strands.

[0011] Furthermore, the hydrophilic fiber filament bundle may be a viscose filament bundle or a fiber-rich filament bundle.

[0012] Furthermore, the count of the hydrophilic fiber filament bundle is 150D to 270D.

[0013] Furthermore, the mass proportion of the core filament bundle in the core-spun yarn is 45% to 50%.

[0014] Furthermore, the melting point of the hydrophobic low-melting-point polyester staple fiber is 85-145°C.

[0015] Furthermore, the basis weight of the outer wrapped strands is 10 to 25 g / 5 m.

[0016] Furthermore, the core-spun yarn is produced by a jet vortex hot air spinning process.

[0017] A method for preparing a core-spun yarn having a moisture-sensitive shape memory effect comprises the following steps:

[0018] S1, twisting the core yarn tow through a pre-twisting device, passing through a tension controller, and then entering the front roller of the vortex spinning machine and the front roller matched with the front roller and outputting;

[0019] S2, after being drawn by the back roller, the middle roller and the front roller, the outer wrapped strands enter the front roller of the vortex spinning machine and the front top roller matched with the front roller and are output;

[0020] S3. The core filament bundle and the outer covering strands are gathered together and enter the vortex spinning hot air hollow spindle together. Under the action of the vortex hot air flow, a moisture-sensitive shape memory vortex spinning core-spun yarn is obtained.

[0021] Furthermore, the spinning speed of the vortex spinning machine is 300m / min to 500m / min, the jet pressure of the hot air flow in the vortex spinning machine is 0.40MPa to 0.65MPa, and the temperature of the hot air flow in the vortex spinning machine is 90 to 150°C.

[0022] Furthermore, the moisture-sensitive shape memory vortex-spun core-spun yarn has a yarn count of 20 to 40 tex.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention uses a hydrophilic fiber filament bundle with a certain twist as the core layer, and is wrapped with a hydrophobic low-melting-point polyester staple fiber as the outer layer. The twisted shape is fixed by hot air vortex spinning. When subjected to moisture stimulation, the core layer absorbs water, expands, and untwists and rotates, driving the outer layer to untwist and rotate. When it returns to dryness, the outer layer drives the core layer to return to the twisted state. Due to the difference in moisture absorption and swelling between the two materials and the structural combination of the twisted core layer and the solidified outer layer of the core yarn, the core yarn has moisture sensitivity and shape memory.

[0025] 2. The present invention uses air-jet vortex spinning technology to prepare core-spun yarn, which has high spinning efficiency. By changing the types of the core layer and the skin layer of the core-spun yarn, the yarn has the advantages of high strength, good wear resistance, smooth fabric surface, and good anti-pilling properties;

[0026] 3. When the fabric woven with the core-spun yarn disclosed in the present invention is wrinkled or deformed, it only needs simple wet stimulation to cause the fabric to curl and deform under the drive of the yarn rotation. The fabric can be restored to its original shape after drying. The raw materials are generally available, the operation is simple and efficient, and the practicality is strong.

[0027] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a structural schematic diagram of a spinning device according to a preferred embodiment of the present invention.

[0030] 1. Outer wrapped yarn; 2. Back roller; 3. Middle roller; 4. Front roller; 5. Vortex spinning hot air hollow spindle; 6. Fiber-rich filament bundle; 7. Pre-twisting device; 8. Core bundle; 9. Tension device; 10. Moisture-sensitive shape memory vortex spinning core-spun yarn. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0032] A core-spun yarn with a moisture-sensitive shape memory effect is shown in a preferred embodiment of the present invention. The core-spun yarn has both moisture-sensitive and shape memory properties and is easy to use. The core-spun yarn includes a core layer and a skin layer wrapped around the core layer.

[0033] The core layer is positioned at the center of the core-spun yarn, using a hydrophilic fiber filament bundle as the core bundle. The hydrophilic fiber filament bundle used can be a viscose filament bundle, a fiber-rich filament bundle, or other non-limiting examples. In this embodiment, the use of a fiber-rich filament bundle as the hydrophilic fiber filament bundle ensures that the resulting core-spun yarn and fabric have a moisture content that meets the physiological requirements of human skin, is smooth and cool, breathable, antistatic, and has brilliant dyeing properties. Furthermore, they exhibit properties such as low shrinkage, high strength, excellent elasticity, and good alkali resistance. The fiber-rich filament bundle has a yarn count of 150D to 270D, ensuring strength while making the resulting core-spun yarn and fabric soft and smooth.

[0034] The core yarn is pre-twisted in a twisting device with a twist range of 100 to 1000 twists / m. This twisting creates an inclined spiral twist in the core yarn, forming a compact structure that is resistant to lateral damage and possesses a certain strength, elongation, and elasticity. This improves the processability of the resulting core-spun yarn, enabling it to withstand the various mechanical forces encountered during dyeing, processing, and use. It also enhances its hygroscopicity and thermal stability, promoting comfort during dyeing, processing, and use. The resulting core-spun yarn exhibits excellent resistance to pilling, snagging, and dyeability, ensuring the final textile is colorful, smooth, and supple, making it popular with consumers.

[0035] The mass proportion of the core yarn in the core-spun yarn is not limited and can be any proportion. Preferably, in this embodiment, the mass proportion of the core yarn in the core-spun yarn is 45% to 50%. The resulting core-spun yarn has high strength, is easy to form, has few broken ends, and has excellent moisture sensitivity and shape memory.

[0036] The cortex is wrapped around the outer periphery of the core layer, and hydrophobic low-melting-point polyester staple fibers are used as the outer covering whiskers. The quantitative weight of the outer covering whiskers is 10-25g / 5m, which can effectively reduce yarn defects and improve the quality of the core-spun yarn. The core-spun yarn produced is strong and durable, wrinkle-resistant and iron-free, non-sticky, wrinkle-resistant and shape-retaining, resistant to sunlight, abrasion, mildew and moth-eaten, and has high strength and elastic recovery ability.

[0037] Specifically, the low-melting-point polyester staple fiber has a melting point of 85-145° C., has a low requirement on the temperature of the hot air flow required for the spinning process, and has good spinnability.

[0038] As mentioned above, the core layer of the core-spun yarn is made of hydrophilic fiber filament bundles with a certain twist, and the sheath layer is made of hydrophobic low-melting-point polyester staple fibers. There is a significant difference in moisture absorption and swelling between the two. After being heated during the spinning process, the sheath fibers melt and bond with the core fibers, solidifying the twisted structure of the yarn. Based on the difference in moisture absorption and swelling between the two materials and the structural combination of the twisted core layer and consolidated sheath of the core-spun yarn, when the deformed core-spun yarn is subjected to wet stimulation, the core-spun yarn untwists and rotates under the drive of the core layer; when it is restored to dryness, the sheath drives the core layer to restore its original twisted state, and it has moisture sensitivity and shape memory. Therefore, after wrinkles and deformation, the fabric woven with this core-spun yarn only needs a simple wet stimulation, and the fabric can return to its original shape after drying. In addition, the raw materials are generally easy to obtain, the operation is simple and efficient, and it is highly practical.

[0039] The core-spun yarn is made by a jet vortex hot air spinning process. The core-spun yarn consisting of the core layer and the skin layer is obtained by adjusting the spinning speed, hot air flow temperature, and jet pressure of the vortex spinning machine.

[0040] See also Figure 1 As shown, the specific preparation method of the core-spun yarn with moisture-sensitive shape memory effect described in this embodiment is:

[0041] S1. The fiber-rich filament bundle 6 is twisted by the pre-twisting device 7, passes through the tension device 9, enters the front roller 4 of the vortex spinning machine and the front roller matched with the front roller 4, and is output.

[0042] S2. After being drawn by the back roller 2, the middle roller 3 and the front roller 4, the outer wrapped strand 1 enters the front roller 4 and the front top roller matched with the front roller 4 of the vortex spinning machine and is output.

[0043] S3, the core yarn bundle 8, and the outer fiber strand 1 are combined and fed into the vortex spinning hot air hollow spindle 5. The spinning speed of the vortex spinning machine is set at 300m / min to 500m / min, and the temperature of the hot air flow is set at 90 to 150°C. The hot air jet pressure is 0.40MPa to 0.65MPa, which is suitable for the spinning speed. The resulting yarn is strong and high-quality, and backflow is avoided during the spinning process. Under the action of the vortex hot air flow, the desired moisture-sensitive shape memory vortex-spun core-spun yarn 10 is obtained. The yarn count of the spun core-spun yarn is 20 to 40tex, the production process is stable, and it is not easy to break. It can be used to weave moisture-sensitive shape memory fabrics with a smooth texture.

[0044] In summary, the present invention adopts a hydrophilic fiber filament bundle with a certain twist as the core layer, and wraps it with a hydrophobic low-melting point polyester staple fiber as the sheath layer. The twisted shape is fixed by hot air vortex spinning. When subjected to wet stimulation, the core layer absorbs water, swells, untwists and rotates, and drives the sheath layer to untwist and rotate. When it is restored to dryness, the sheath layer drives the core layer to restore the twisted state. Based on the difference in moisture absorption and swelling between the two materials and the structural combination of the twisted core layer and the consolidated sheath layer of the core-spun yarn, the core-spun yarn has moisture sensitivity and shape memory; the core-spun yarn is prepared by jet vortex spinning technology, and the spinning efficiency is high. By changing the types of the core layer and the sheath layer of the core-spun yarn, the yarn has the advantages of high strength, good wear resistance, smooth fabric surface, and good anti-pilling properties; the fabric woven with the core-spun yarn disclosed by the present invention only needs simple wet stimulation after wrinkling and deformation, and the fabric will curl and deform under the drive of the yarn rotation, and the fabric can be restored to its original state after drying. The raw materials are generally easy to obtain, the operation is simple and efficient, and the practicability is strong.

[0045] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A core-spun yarn with moisture-sensitive shape memory effect, characterized in that: include: The core layer is arranged at the center of the core-spun yarn, and uses a hydrophilic fiber filament bundle as the core bundle. The core bundle needs to be twisted by a pre-twisting device, and the twist range is 100~1000 twists / m. The mass proportion of the core bundle in the core-spun yarn is 45%~50%; The cortex is wrapped around the outer periphery of the core layer, and is made of hydrophobic low-melting-point polyester staple fiber as the outer covering strands. The melting point of the hydrophobic low-melting-point polyester staple fiber is 85~145℃. The core-spun yarn is processed by a jet vortex hot air spinning process. The spinning speed of the vortex spinning machine used in the jet vortex hot air spinning process is 300m / min~500m / min, the jet pressure of the hot air flow in the vortex spinning machine is 0.40MPa~0.65MPa, and the temperature of the hot air flow in the vortex spinning machine is 90~150℃.

2. The core-spun yarn with moisture-sensitive shape memory effect according to claim 1, wherein: The hydrophilic fiber filament bundle is a viscose filament bundle or a fiber-rich filament bundle.

3. The core-spun yarn with moisture-sensitive shape memory effect according to claim 1, wherein: The specification of the hydrophilic fiber filament bundle is 150D~270D.

4. The core-spun yarn with moisture-sensitive shape memory effect according to claim 1, wherein: The weight of the outer wrapped strands is 10-25 g / 5 m.

5. A method for preparing a core-spun yarn having a moisture-sensitive shape memory effect according to any one of claims 1 to 4, characterized in that: The steps include: S1, twisting the core yarn tow through a pre-twisting device, passing through a tension controller, and then entering the front roller of the vortex spinning machine and the front roller matched with the front roller and outputting; S2, after being drawn by the back roller, the middle roller and the front roller, the outer wrapped strands enter the front roller of the vortex spinning machine and the front top roller matched with the front roller and are output; S3. The core filament bundle and the outer covering strands are gathered together and enter the vortex spinning hot air hollow spindle together. Under the action of the vortex hot air flow, a moisture-sensitive shape memory vortex spinning core-spun yarn is obtained.

6. The method for preparing the core-spun yarn with moisture-sensitive shape memory effect according to claim 5, wherein: The yarn count of the moisture-sensitive shape memory vortex-spun core-spun yarn is 20-40 tex.

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