A method for preparing a composite core yarn

Abstract

The present application relates to the technical field of textile products, and particularly relates to a preparation method of composite core-spun yarn, which comprises core yarn, sheath yarn and sheath-core adhesive layer. First, the thicker core yarn is dipped into a melt tank, and then the core yarn covered with the melt adhesive layer is drawn and thinned after the melt is cooled to obtain the core yarn for preparing the core-spun yarn; wherein, during the process from the formation of the core-spun yarn to the winding process in the stage of spinning the core-spun yarn, the core-spun yarn sequentially passes through the hot air area and the cold air area, and finally the composite core-spun yarn is formed. The composite core-spun yarn prepared by the present application has good covering property and structural stability, can effectively solve the problem of core yarn exposure due to the smooth surface of the core yarn in the later use process such as weaving processing, and endows the product with good performance stability; meanwhile, the composite core-spun yarn prepared by the present application also has good strength and wear resistance, and has great application prospect in the field of high-performance or functional high-end textiles.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to a method for preparing composite core-spun yarn. Background Technology

[0002] Flexible mechanical protective materials not only offer excellent wearing comfort but also provide superior bulletproof, stab-proof, cut-proof, and impact-resistant capabilities. They are now widely used in military and civilian applications, such as cut-resistant gloves, bulletproof vests, and blast-proof products. Combining high-performance organic fibers with inorganic metal fibers to form core-spun yarn not only endows flexible protective products with excellent cut-proof performance but also provides the softness and comfort unique to textiles. However, due to the smooth surface of metal fibers, the metal core filaments are prone to slipping out during fabric preparation, becoming exposed from the yarn and limiting their mechanical properties and service life. Therefore, special methods are needed to enhance the stability of the core-spun yarn wrapping.

[0003] Many pieces of information about chemical fiber / metal core-spun yarn can be found in published Chinese patent documents. For example, patent number CN202310776612.9 provides a core-spun yarn production equipment and production process, including a cleaning device. The cleaning device is set on a frame and is used to treat the surface of the metal wire core so that it can remove impurities from the surface of the metal wire core before the short fibers cover the metal wire core.

[0004] The core-spun yarns prepared using the aforementioned existing techniques are prone to core leakage, requiring further technological improvements to more effectively enhance the wrapping properties during the core-spun yarn weaving process, thereby further improving the product's abrasion resistance and service life. As those skilled in the art, there is an urgent need to develop composite core-spun yarns with good structural and performance stability. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a method for preparing composite core-spun yarn, which improves the overall stability of the wrapping structure of chemical fiber-metal core-spun yarn during the weaving process, thereby enhancing its mechanical properties and service life.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for preparing composite core-spun yarn, the composite core-spun yarn comprising a core yarn, a sheath yarn, and a sheath-core bonding layer, the method comprising the following steps:

[0008] Step 1: Preparation of core filaments with a thermal bonding layer: First, the masterbatch material of the core-sheath bonding layer is placed in a heating tank to melt. Then, a thicker core filament is immersed into the melt tank at a certain speed through a pressure roller. After the melt layer is evenly wrapped on the surface of the core filament, it is scraped through a small diameter groove to make the melt thickness on the surface of the core filament thin and uniform. Finally, it is cooled and shaped to form a core filament covered with a thermal bonding layer.

[0009] Step 2: Prepare core yarn with a thermal adhesive layer: Heat the core yarn with adhesive layer obtained in step 1 to a certain temperature so that the surface adhesive layer softens, melts and becomes stretchable. Use a multi-stage drawing device to draw the core yarn with thermal adhesive layer to a preset thickness in multiple stages to obtain the core yarn with adhesive layer, which is used to prepare core-spun yarn.

[0010] Step 3: Spinning core-spun yarn on a spinning machine: The core yarn obtained in step 2 is introduced from the front roller of the spinning machine and passes through the twisting triangle area with the outer yarn. Then, it passes through the hot air area and the cold air area in sequence, so that the organic matter in the adhesive layer softens and melts to bond some of the fibers on the inner surface of the outer yarn. Finally, it is shaped by cold air and wound to obtain composite core-spun yarn.

[0011] Preferably, in step 1, the core-skin adhesive layer is either PE or PP, and the thickness of the core-skin adhesive layer is 0.1-10 μm.

[0012] Preferably, in step 1, the core filament is either a monofilament or a multifilament, the melting point of the core filament is higher than the melting point of the core-sheath bonding layer, the core filament is made of tungsten wire or stainless steel wire, and the equivalent diameter of the core filament is 200-1000 μm.

[0013] Preferably, in step 1, the temperature of the cold air during cooling and forming is 14-20℃, and the wind speed is 0.8-1.5m / s.

[0014] Preferably, in step 2, the equivalent diameter of the core wire obtained after multi-stage drawing is 10-50 μm.

[0015] Preferably, in step 3, the yarn is composed of short fibers, and the yarn is any one of high-strength, high-modulus PVA fiber, PET fiber, or aramid fiber, and the melting point of the yarn is higher than the melting point of the core-sheath adhesive layer.

[0016] Preferably, in step 3, the air temperature in the hot air zone is slightly higher than the softening temperature of the core-skin adhesive layer.

[0017] Preferably, in step 3, the air temperature in the cold air zone is room temperature.

[0018] By adopting the above technical solution: first, core yarn is prepared; then, a multi-stage drafting device is used to draft the core yarn to a preset diameter to prepare core yarn for core-spun yarn; finally, a spinning machine is used to prepare composite core-spun yarn.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This invention uses a core yarn made by melting a low-melting-point organic material and wrapping it around the surface of the core yarn, and then producing a core yarn through a multi-stage drawing process. The core yarn is then made of high-temperature resistant and high-mechanical-strength short fibers. The core yarn is then bonded to the fibers inside the core yarn by a hot air device on a spinning machine to produce a core yarn.

[0021] 2. The core yarn obtained in this invention can achieve a thin and uniform surface thermal bonding layer while ensuring the preparation of extremely small diameter yarn, without significantly affecting the softness of the core-spun yarn.

[0022] 3. This invention can ensure the softness and comfort of the yarn surface while solving the problem of core-spun yarn being easily exposed due to the smoothness of the metal core wire during the weaving process. It endows the core-spun yarn with outstanding structural stability and performance stability, giving it good wrapping properties, abrasion resistance, strength and service life. Attached Figure Description

[0023] Figure 1 This is a flowchart of the present invention;

[0024] Figure 2 This is a schematic diagram illustrating the principle of preparing a core wire with an adhesive layer on its surface in this invention. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, so that those skilled in the art can better understand the advantages and features of the present invention, thereby making a clearer definition of the scope of protection of the present invention. The embodiments described in this invention are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] Reference Figures 1-2 A method for preparing composite core-spun yarn, the composite core-spun yarn comprising core yarn, outer yarn, and a core-outer-outer bonding layer, the method comprising the following steps:

[0027] Step 1: Preparation of core wire with a thermally adhesive layer: Low-melting-point organic materials such as PE and PP are selected as the core-sheath adhesive layer. The masterbatch is placed in a heating bath and heated to above the softening temperature, causing the masterbatch slices to become a melt. Tungsten wire, stainless steel wire, or other metal wires with a diameter of (200-1000) μm are selected as the core wire. The core wire is immersed in the melt bath at a certain speed through pressure rollers. The organic melt is evenly coated on the surface of the core wire. After passing through upper and lower pressure rollers and a small-diameter scraper groove, the melt thickness on the surface of the core wire is made as uniform and thin as possible. Finally, it is formed by cold air to form a core wire with an organic thermally adhesive layer.

[0028] Step 2: Prepare core yarn with a thermally bonded layer: Heat the core yarn with the bonded layer to a certain temperature so that the surface bonded layer softens, melts and becomes stretchable. Use a multi-stage drawing device to draw the core yarn with the thermally bonded layer to (10-50) μm to obtain the core yarn with the thermally bonded layer, which is used to prepare core-spun yarn and improve the mechanical protection performance of core-spun yarn.

[0029] Step 3: Spinning core-spun yarn on a spinning machine: The core yarn is introduced from the front roller of the spinning machine and passed through the twisting triangle zone with short fiber yarns such as aramid fiber, high-strength high-modulus polyvinyl alcohol fiber, and PET fiber. Then, it passes through a hot air zone with a temperature slightly higher than the softening temperature of the core-spun yarn bonded layer, so that the heat-bonded layer softens and melts, bonding only the inner part of the yarn fibers. Then, it is cooled and shaped in a cold air zone and wound to obtain composite core-spun yarn.

[0030] In this embodiment, the core filament has an extremely small diameter and its surface thermal bonding layer is thin and uniform, which will not have a significant impact on the softness of the core-spun yarn. The resulting core-spun yarn can ensure the softness and comfort of the yarn surface while solving the problem of core-spun yarn being easily exposed due to the smoothness of the metal core filament during the weaving process. It has outstanding structural stability and performance stability, exhibiting good wrapping properties, abrasion resistance, strength and service life, and can be applied to functional or protective textiles, providing functions such as cut resistance and abrasion resistance.

[0031] Specifically, taking aramid / tungsten filament core-spun yarn as an example, the following is an embodiment:

[0032] Step 1: Preparation of core wire with a thermally bonded layer: PE is selected as the core-sheath bonding layer. The PE masterbatch is placed in a heating bath and heated to 120-180℃, causing the PE masterbatch slices to melt. Tungsten wire with a diameter of 200μm is selected as the core wire. The tungsten wire is immersed in the melt bath at a certain speed through pressure rollers. The PE melt is evenly coated on the surface of the tungsten wire. After passing through upper and lower pressure rollers and a small-diameter scraper with a 250μm aperture, the PE melt coating on the surface of the tungsten wire is made as uniform and thin as possible. Finally, it is formed by cold air to create a tungsten wire core wire with a PE bonding layer.

[0033] The cooling air blowing system controls the temperature at 14-20℃ and the air speed at 0.8-1.5m / s to ensure that the outer PE layer can cool down quickly and solidify.

[0034] Step 2: Preparation of core wire with a thermal adhesive layer: The core wire raw filament covered with the adhesive layer is heated to a certain temperature, so that the surface adhesive layer softens, melts and becomes stretchable. The core wire raw filament covered with the melt adhesive layer is stretched by about 6.6 times in multiple stages using a multi-stage drawing device, and drawn thin to 30μm to obtain tungsten wire core wire covered with PE thermal adhesive layer, which is used to prepare core-spun yarn.

[0035] Step 3: Spinning core-spun yarn on a spinning machine: The tungsten core yarn is introduced from the front roller of the spinning machine and passes through the twisting triangle zone with the aramid short fiber yarn. Then, it passes through a hot air zone with a temperature slightly higher than the softening temperature of the core-spun yarn bonded layer, so that the heat-bonded layer softens and melts, bonding only the inner part of the yarn fibers. Then, it passes through a cold air zone to cool and shape, and is wound to obtain aramid / tungsten core-spun yarn.

[0036] The hot air system temperature is controlled between 150-200℃, and the hot air zone is about 10cm long.

[0037] The aramid / tungsten filament core-spun yarn obtained in this embodiment has good softness and surface comfort, as well as excellent structural stability and performance stability. It can effectively avoid core leakage during later weaving and use, improve its abrasion resistance and service life, and can be used to prepare cut-resistant textile products.

[0038] In summary, the composite core-spun yarn prepared by this invention has good covering properties and structural stability, which can effectively solve the problem of core yarn exposure caused by the smooth surface of the core yarn during the later weaving and processing, and endow the product with good performance stability.

[0039] The descriptions and practices disclosed in this invention are readily apparent and understandable to those skilled in the art, and various modifications and refinements can be made without departing from the principles of this invention. Therefore, any modifications or improvements made without departing from the spirit of this invention should also be considered within the scope of protection of this invention.

Claims

1. A method for preparing composite core-spun yarn, characterized in that, The composite core-spun yarn comprises a core yarn, a sheath yarn, and a sheath-core bonding layer. The preparation method of the composite core-spun yarn includes the following steps: Step 1: Preparation of core filaments with a thermal bonding layer: First, the masterbatch material of the core-sheath bonding layer is placed in a heating tank to melt. Then, a thicker core filament is immersed into the melt tank at a certain speed through a pressure roller. After the melt layer is evenly wrapped on the surface of the core filament, it is scraped through a small diameter groove to make the melt thickness on the surface of the core filament thin and uniform. Finally, it is cooled and shaped to form a core filament covered with a thermal bonding layer. Step 2: Prepare core yarn with a thermal adhesive layer: Heat the core yarn with adhesive layer obtained in step 1 to a certain temperature so that the surface adhesive layer softens, melts and becomes stretchable. Use a multi-stage drawing device to draw the core yarn with thermal adhesive layer to a preset thickness in multiple stages to obtain the core yarn with adhesive layer, which is used to prepare core-spun yarn. Step 3: Spinning core-spun yarn on a spinning machine: The core yarn obtained in step 2 is introduced from the front roller of the spinning machine and passes through the twisting triangle area with the outer yarn, and then passes through the hot air area and the cold air area in sequence, so that the organic matter in the adhesive layer softens and melts to bond some of the fibers on the inner surface of the outer yarn. Finally, it is shaped by cold air and wound to obtain composite core-spun yarn. In step 1, the core-skin adhesive layer is either PE or PP, and the thickness of the core-skin adhesive layer is 0.1-10 μm; In step 1, the core filament is either a monofilament or a multifilament, the melting point of the core filament is higher than the melting point of the core-sheath bonding layer, the core filament is made of tungsten wire or stainless steel wire, and the equivalent diameter of the core filament is 200-1000μm. In step 1, the temperature of the cold air during cooling and forming is 14-20℃, and the wind speed is 0.8-1.5m / s; In step 2, the equivalent diameter of the core wire obtained after multi-stage drawing is 10-50 μm; In step 3, the leather yarn is composed of short fibers, and the leather yarn is any one of high-strength high-modulus PVA fiber, PET fiber or aramid fiber. The melting point of the leather yarn is higher than the melting point of the leather core adhesive layer. In step 3, the air temperature in the hot air zone is slightly higher than the softening temperature of the core-sheath adhesive layer, causing the thermal adhesive layer to soften and melt, bonding only the inner part of the fibers of the yarn. In step 3, the air temperature in the cold air zone is room temperature.

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