Inorganic fiber double-helix rotating core spinning yarn intelligent knitted fabric and processing method and application thereof

Abstract

The invention provides an inorganic fiber double-helix rotating core spinning yarn intelligent knitted fabric and a processing method and application thereof.Heat-insulating flame-retardant yarn and sensing heat-conducting yarn are prepared through a wrapping-wrapping combined spinning technology and used for weaving weft-knitted double-face spacer fabric, the core-shell structure wraps the heat-insulating flame-retardant yarn as one layer, the core-shell structure wraps the sensing heat-conducting yarn as the other layer, and the core-shell structure wraps the sensing heat-conducting yarn as the other layer; the intelligent knitted fabric made of the inorganic fiber double-helix rotating core spinning yarn has the properties of fire resistance, flame retardance, heat insulation, sensing and the like, and the problems that the inorganic fiber and the sensing yarn are difficult to weave and wear and are used for knitting a three-dimensional structure and the like are solved. The technological process is simple, the fabric has multiple functions and a wide application range, and the prepared intelligent knitted fabric has the characteristics of a three-dimensional structure, fire resistance, flame retardance, heat conduction, sensing and the like, and is suitable for preparing high-quality multifunctional special equipment.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and in particular to an intelligent knitted fabric made of inorganic fiber double helix rotating core-spun yarn, its processing method, and its application. Background Technology

[0002] Spacer fabrics possess excellent properties such as cushioning, warmth, pressure resistance, sound insulation, and shock absorption. Spacer fabrics consist of three layers. The inner layer is typically composed of one or more spacer yarns with high bending stiffness, separating and supporting the upper and lower surface layers, thus creating an air layer of a certain thickness within the inner layer. This creates an intermediate layer with a certain spatial height between the two layers, providing significant added value. Currently, knitted spacer fabrics are mainly used in automotive interior linings, medical products, and padding.

[0003] Inorganic fibers possess excellent thermal insulation and electrical conductivity properties. High-quality yarns made from inorganic fibers using novel spinning technologies, further processed through weaving techniques, can be used to create multifunctional knitted spacer fabrics with broad development prospects. However, current methods for processing inorganic fibers are limited, and their application in spacer fabrics is relatively poor.

[0004] Patent CN117811404 A discloses a variable-thickness weft-knitted spacer fabric-based DC triboelectric nanogenerator. This fabric is composed of a conductive layer and an insulating layer. The conductive layer and the insulating layer are connected by spacer layers made of spacer yarns. The insulating layer has a plain weave structure woven from insulating yarns, and the conductive layer has a plain weave structure woven from conductive yarns. The conductive layer includes at least one set of triboelectric electrode portions and at least one set of breakdown electrode portions, while the transition portion is woven from insulating yarns. This fabric is mainly used for powering microelectronic devices without energy loss. However, the fabric is relatively thick, making it bulky to wear, and it lacks fire resistance.

[0005] Patent CN108437595B discloses a weft-knitted spacer fabric and its preparation method, as well as a polyurethane foam composite material containing the fabric. The spacer fabric consists of three parts: an upper surface layer, spacer yarns in the middle, and a lower surface layer. The spacer yarns are looped together on the upper and lower surface layers, connecting them into a three-dimensional structure. Different looping methods alter the connection distance and number of loops, and the elastic yarns on the upper and lower surface layers cause variations in the thickness of the spacer fabric and the density of the spacer yarns. This invention utilizes the excellent cushioning and compression resistance of the spacer fabric, adjusting the density of the spacer yarns in different parts to achieve different load-bearing conditions in each part, thus achieving an overall reinforcement effect on the shoe sole substrate. However, this fabric cannot combine the cushioning effect of the spacer fabric with sensing performance, resulting in a single performance characteristic.

[0006] Therefore, the challenge of combining high-quality yarn prepared from inorganic fibers with spacer fabric using novel spinning technology to create a multifunctional fire-resistant and heat-insulating intelligent knitted spacer fabric remains to be solved. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this invention is to provide a processing method for intelligent knitted fabrics made of inorganic fiber double helix rotating core spinning yarn with fire resistance, heat insulation and intelligent sensing functions. The intelligent knitted fabric is suitable for special protection fields such as fire fighting, military clothing, and robot clothing.

[0008] To achieve the above objectives, the present invention provides a method for processing intelligent knitted fabrics from inorganic fiber double-helix rotating core-spun yarns, comprising the following steps:

[0009] Step 1: First, the thermally conductive inorganic fibers are twisted to obtain the initial twisted filament of thermally conductive inorganic fibers; then, the two initial twisted filaments of thermally conductive inorganic fibers with opposite α-helices are twisted together in the forward direction to obtain the sensing yarn a with a β-double helix structure.

[0010] Step 2: Twist several thermally conductive inorganic fiber multifilaments with flexible filaments to obtain thermally conductive inorganic fiber multifilaments. Feed them into the covering yarn forming zone of the spinning machine under a certain tension to serve as core yarns. Draft the fiber sliver prepared from the thermally conductive fibers into thermally conductive fiber slivers through the drafting system of the spinning machine. After being output from the drafting system, the thermally conductive fiber slivers enter the covering yarn forming zone and merge with the core yarns. This generates a covering twisting motion where the core yarns rotate and the thermally conductive fibers revolve, so that the thermally conductive fibers are evenly covered on the outer layer of the core yarns, forming a core-sheath structure thermally conductive core-spun yarn b.

[0011] Step 3: Using the sensing yarn a prepared in Step 1 as the core yarn and the thermally conductive core-spun yarn b prepared in Step 2 as the outer wrapping yarn, a cross-wound sensing thermally conductive yarn is prepared by a filament wrapping spinning machine. The sensing yarn a is output from the front roller through the drafting device and passes through the upper and lower hollow spindles respectively. The rotation of the upper and lower hollow spindles causes the thermally conductive core-spun yarn b wound on the hollow spindles to unwind and evenly cover the sensing yarn a. The upper hollow spindle unwinds the thermally conductive core-spun yarn b in the S-twist direction, and the lower hollow spindle unwinds the thermally conductive core-spun yarn b in the Z-twist direction, thereby wrapping the thermally conductive core-spun yarn b in the forward and reverse directions on the outer layer of the sensing yarn to obtain the cross-wound sensing thermally conductive yarn A. The sensing thermally conductive yarn A is wound on a bobbin to form a package.

[0012] Step 4: First, twist the heat-insulating inorganic fibers to obtain heat-insulating inorganic fiber initial twist yarn; then twist the two reverse α-helical heat-insulating inorganic fiber initial twist yarns in the forward direction to obtain heat-insulating yarn c with β double helix structure.

[0013] Step 5: Twist several heat-insulating inorganic fiber multifilaments with flexible filaments to obtain heat-insulating inorganic fiber multifilaments, and feed them into the covering yarn forming zone of the spinning machine under a certain tension as core yarns; Draft the fiber sliver prepared from flame-retardant and heat-insulating organic fibers into fiber slivers through the drafting system of the spinning machine. After being output from the drafting system, the flame-retardant and heat-insulating fiber slivers enter the covering yarn forming zone and merge with the core yarns, generating a covering twisting motion of core yarn rotation and flame-retardant and heat-insulating fiber revolution, so that the flame-retardant and heat-insulating fibers are evenly covered on the outer layer of the heat-insulating inorganic fiber multifilaments, forming a core-sheath structure heat-insulating core-spun yarn d;

[0014] Step 6: Using the insulating yarn c prepared in Step 4 as the core yarn and the insulating core-spun yarn d prepared in Step 5 as the outer wrapping yarn, cross-wound insulating and flame-retardant yarn B is prepared by a filament wrapping spinning machine. The insulating yarn c is output from the front roller through the drafting device and passes through the upper and lower hollow spindles respectively. The rotation of the upper and lower hollow spindles causes the insulating core-spun yarn d wound on the core-sheath structure of the hollow spindle to unwind and evenly cover the insulating yarn c. The upper hollow spindle unwinds the insulating core-spun yarn d in the S-twist direction, and the lower hollow spindle unwinds the insulating core-spun yarn d in the Z-twist direction, so that the insulating core-spun yarn d is wrapped on the outer layer of the insulating yarn in the forward and reverse directions to obtain the cross-wound insulating and flame-retardant yarn B. Finally, the insulating and flame-retardant yarn B is wound on a bobbin to form a package.

[0015] Step 7: The upper layer uses the sensing and heat-conducting yarn A prepared in step 3, the lower layer uses the heat-insulating and flame-retardant yarn B prepared in step 6, and the two layers are connected together by high-strength yarn as a spacer to form a three-dimensional spacer fabric, thus obtaining the inorganic fiber double helix rotating core spun yarn intelligent knitted fabric.

[0016] As a further improvement of the present invention, in steps 2 and 5, the spinning machine is a ring spinning machine, a friction spinning machine, a vortex spinning machine, or a rotor spinning machine; in steps 3 and 6, the filament wrapping spinning machine is a fancy twisting machine or a filament covering machine.

[0017] As a further improvement of the present invention, in step 2, the thermally conductive inorganic fiber multifilament is composed of 10 to 300 thermally conductive inorganic fibers, the diameter of a single thermally conductive inorganic fiber is 20 to 30 μm, and the twist is 20 to 40 twists / 10cm; the thermally conductive inorganic fiber is one of carbon fiber, metal fiber, stainless steel fiber, aluminum alloy fiber, and silicon nitride fiber; the thermally conductive fiber is one of silicon carbide fiber, carbon nanotube fiber, and boron nitride fiber.

[0018] As a further improvement of the present invention, in step 2, the flexible filament is one of polyester filament, nylon filament, ultra-high molecular weight polyethylene filament, polypropylene filament, and acrylic filament; in step 5, the flexible filament is one of aramid filament, aramid sulfone filament, polybenzimidazole filament, polyphenylenepyridinium diimidazole filament, and alumina filament.

[0019] As a further improvement of the present invention, in step 4, the heat-insulating inorganic fiber is one of basalt fiber, glass fiber, and alumina fiber.

[0020] As a further improvement of the present invention, in step 5, the heat-insulating inorganic fiber multifilament is composed of 10 to 300 heat-insulating inorganic fibers, and the heat-insulating inorganic fiber is one of asbestos fiber, diatomaceous earth fiber, perlite fiber, calcium silicate fiber, and mullite fiber.

[0021] As a further improvement of the present invention, in step 5, the flame-retardant and heat-insulating organic fiber is one of polyimide fiber, flame-retardant gas gel fiber, hollow aramid fiber, flame-retardant mixed fiber, cork ester fiber, polystyrene fiber, and polyurethane fiber.

[0022] This invention also provides an intelligent knitted fabric made of inorganic fiber double helix rotating core-spun yarn, which is obtained by the above-mentioned processing method of the intelligent knitted fabric made of inorganic fiber double helix rotating core-spun yarn. The fabric is a knitted fabric with at least three layers formed by interlocking loops. The outer layer of the fabric is a thermally conductive and electrically conductive layer formed by interlocking sensing yarn loops. The sensing yarn used is a thermally conductive rotating core yarn with a β double helix as the core and a thermally conductive fiber covering layer as the sheath. Its core is a β double helix yarn formed by forward twisting two opposing α helix thermally conductive inorganic fiber single yarns. The sheath... The fabric consists of a core-sheath structure of thermally conductive core-spun yarn with thermally conductive fibers wrapped around inorganic thermally conductive fibers; the inner layer of the fabric is an insulating and flame-retardant layer formed by loops of insulating yarn. The insulating and flame-retardant yarn used is an insulating core-spun yarn with a β double helix as the core and a flame-retardant and heat-insulating organic fiber wrapping layer as the sheath. The core is a β double helix yarn formed by forward twisting two opposing α helix insulating inorganic fiber single yarns. The sheath is an insulating core-spun yarn with a core-sheath structure of flame-retardant and heat-insulating organic fibers wrapped around inorganic insulating fibers; the middle layer is connected to the inner and outer layers by high-strength, high-modulus yarn as a spacer.

[0023] The inorganic fiber double-helix rotating core-spun yarn intelligent knitted fabric is used in special work clothes, intelligent fire-fighting clothing, electronic component protective cases, robot intelligent clothing, military clothing, and military tents.

[0024] The beneficial effects of this invention are:

[0025] (1) The processing method of the inorganic fiber double helix core-spun yarn intelligent knitted fabric provided by the present invention uses the coating-wrapping combined spinning technology to prepare heat-insulating and flame-retardant yarn and sensing and heat-conducting yarn. The two yarns are used to weave weft-knitted double-sided spaced fabric. The core-shell structure coating heat-insulating and flame-retardant yarn is used as one layer, and the sensing and heat-conducting coating and wrapping yarn is used as another layer. They are connected together by loops in the middle to obtain the inorganic fiber double helix core-spun yarn intelligent knitted fabric. The prepared fabric has the properties of knitted fabric, excellent fire resistance and heat insulation properties, and intelligent sensing properties. It improves the application range of knitted fabric and solves the problems that inorganic fibers and sensing yarns are difficult to weave into clothing and use for knitting three-dimensional structures.

[0026] (2) The inorganic fiber double helix rotating core spun yarn smart knitted fabric prepared by the present invention utilizes the difference in electron binding force between heat insulation fiber and heat conduction fiber. During the contact friction process, the heat conduction layer and the heat insulation layer form an electric potential difference. The electrical signal is extracted through the sensing yarn, realizing the effective combination of triboelectric nanogenerator and knitted fabric. At the same time, it realizes a multifunctional fabric that combines fire resistance, heat insulation and sensing.

[0027] (3) The process of the present invention is simple, the fabric has multiple functions and wide application. The intelligent knitted fabric prepared has three-dimensional structure, fire resistance and flame retardancy, thermal conductivity and sensing characteristics, and is suitable for the preparation of high-quality multi-functional special equipment.

[0028] (4) The inorganic fiber double helix rotating core spun yarn intelligent knitted fabric prepared by the present invention has a multi-layer structure and different functions. It can be a double-layer fabric connected by a single layer of spacer yarn, or a three-dimensional spacer knitted fabric with three or more layers.

[0029] (5) The inorganic fiber double helix core-spun yarn intelligent knitted fabric prepared by the present invention adopts a new core-spun technology to wrap the inorganic fiber filaments that are difficult to spin or form into yarn with organic fibers, thereby improving the spinnability of inorganic fibers and the universality of their products, and solving the problems of difficult yarn formation and weaving of inorganic fibers. Attached Figure Description

[0030] Figure 1 A schematic flowchart of the processing method for intelligent knitted fabrics made from inorganic fiber double helix rotating core spinning yarn of the present invention.

[0031] Figure 2 This is a schematic diagram of the initial twisting of pretreated inorganic fibers for ring spinning.

[0032] Figure 3 A schematic diagram of an apparatus for tightly spinning and covering thermally conductive and insulating yarns.

[0033] Figure 4 This is a schematic diagram of a hollow spindle wrapping spinning machine.

[0034] Figure 5 The results are the electrical output performance test results of Example 1 and Comparative Examples 1-4.

[0035] Figure Labels

[0036] 1-First yarn guide device; 2-Second yarn guide device; 3-Front roller; 4-Front roller; 5-Yarn guide hook; 6-Boll tube; 7-Ring; 8-Trapezoidal wire; 9-Composite yarn; 10-Flexible filament; 11-Roving; 12-Flare mouth; 13-Rear roller; 14-Middle roller; 15-Front roller; 16-Rear roller; 17-Middle roller; 18-Front roller; 19-Auxiliary conveying unit; 20-Drafting system; 21-Negative pressure adsorption assembly; 22-Yarn guide hook; 23-Boll yarn; 24-Front roller; 25-Front roller; 26-Upper hollow spindle; 27-False twister; 28-Lower hollow spindle; 29-Output roller; 30-Covering yarn forming area; 31-Yarn guiding traverse device; 32-Yarn guide hole; 33-Boll yarn. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0039] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] This invention provides a method for processing intelligent knitted fabrics from inorganic fiber double-helix rotating core-spun yarn, the process of which is as follows: Figure 1 As shown, it includes the following steps:

[0041] Step 1: First, the thermally conductive inorganic fibers are twisted to obtain the initial twisted thermally conductive inorganic fiber yarn; then, two opposing α-helical initial twisted thermally conductive inorganic fiber yarns (Z twist) are twisted together in the forward direction to obtain the sensing yarn a (S twist) with a β double helix structure.

[0042] Specifically, such as Figure 2As shown, at least one initial twisted thermally conductive inorganic fiber yarn is output from the front nip of the ring spinning machine, which is composed of the front roller 4 and the front skin roller 3, through the first fixed yarn guide device 1. At least one initial twisted thermally conductive inorganic fiber yarn unwound from another bobbin package is fed into the front nip of the ring spinning machine, which is composed of the front roller 4 and the front skin roller 3, through the second fixed yarn guide device 2. The two initial twisted thermally conductive inorganic fiber yarns are then fed into the front nip at intervals and parallel to each other, so that the two initial twisted thermally conductive inorganic fiber yarns are twisted into yarn through the speed difference between the rotation of the wire ring 8 on the ring 7 and the yarn tube on the bobbin support frame 6 via the yarn guide hook 5.

[0043] Two thermally conductive inorganic fiber filaments output from the front jaws are forward twisted to form a double-helix sensing yarn a, which is then wound into a bobbin for later use. The twist is 20-40 twists / 10cm, and the twist direction is S-twist.

[0044] Thermally conductive inorganic fibers are one of the following: carbon fiber, metal fiber, stainless steel fiber, aluminum alloy fiber, and silicon nitride fiber.

[0045] Step 2: Twist several thermally conductive inorganic fiber multifilaments with flexible filaments to obtain thermally conductive inorganic fiber multifilaments. Feed them into the covering yarn forming zone of the spinning machine under a certain tension to serve as core yarns. Draft the fiber sliver prepared from the thermally conductive fibers into thermally conductive fiber slivers through the drafting system of the spinning machine. After being output from the drafting system, the thermally conductive fiber slivers enter the covering yarn forming zone and merge with the core yarns. This generates a covering twisting motion where the core yarns rotate and the thermally conductive fibers revolve, so that the thermally conductive organic fibers are evenly coated on the outer layer of the core yarns, forming a core-sheath structure of thermally conductive core-spun yarn b.

[0046] Specifically, the twisted thermally conductive inorganic fiber multifilament 9 and flexible filament 10 are fed into the covering yarn forming zone 30, which consists of a front roller 18, an auxiliary conveying unit 19, and a negative pressure adsorption component 21, under a certain tension. The thermally conductive fiber sliver is then drawn by the drawing system 20, which consists of a front roller 15, a middle roller 14, and a rear roller 13, to obtain a thermally conductive fiber sliver. After the thermally conductive inorganic multifilament is combined with the flexible filament to form a thermally conductive inorganic fiber initial twisted composite filament, it is then combined with the drawn sliver in the covering yarn forming zone. After passing through the yarn guide hook 22, the thermally conductive inorganic fiber initial twisted composite filament rotates, causing the thermally conductive fiber to revolve, so that the fiber is evenly wrapped around the outer layer of the core filament, forming a core-sheath structure thermally conductive core-wrapped yarn b, and finally forming a cone yarn 23.

[0047] Specifically, the thermally conductive inorganic fiber multifilament consists of 10 to 300 thermally conductive inorganic fibers, with a diameter of 20 to 30 μm for each fiber and a twist of 20 to 50 twists / 10 cm.

[0048] Thermally conductive inorganic fibers are one of the following: carbon fiber, graphene fiber, metal fiber, stainless steel fiber, aluminum alloy fiber, and silicon nitride fiber.

[0049] The thermally conductive fiber is one of silicon carbide fiber, carbon nanotube fiber, or boron nitride fiber.

[0050] Flexible filament is one of polyester filament, nylon filament, ultra-high molecular weight polyethylene filament, polypropylene filament, or acrylic filament.

[0051] Step 3: Using the sensing yarn a prepared in Step 1 as the core yarn and the thermally conductive core-spun yarn b prepared in Step 2 as the outer wrapping yarn, a cross-wound sensing and thermally conductive yarn is prepared by a filament wrapping spinning machine. The sensing yarn a is output from the front roller through the drafting device and passes through the upper and lower hollow spindles respectively. The rotation of the upper and lower hollow spindles causes the thermally conductive core-spun yarn b wound on the hollow spindles to unwind and evenly cover the sensing yarn a. This process is repeated in both forward and reverse directions to obtain the cross-wound sensing and thermally conductive yarn A. The sensing and thermally conductive yarn A is then wound onto a bobbin to form a package.

[0052] Specifically, such as Figure 4 As shown, the β-double helix structure sensing yarn a prepared in step 1 is output from the nip formed by the front roller output 25 and the front skin roller 24 through the drafting device, passes through the upper hollow spindle 26, then through the false twister 27, and then through the lower hollow spindle 28. The upper and lower hollow spindles unwind the core-sheath structure thermally conductive core-spun yarn b on the hollow spindle by rotating in opposite directions and then wrap it around the β-double helix structure sensing yarn a prepared in step 1. Specifically, the upper hollow spindle unwinds the thermally conductive core-spun yarn b in the S-twist direction, and the lower hollow spindle unwinds the thermally conductive core-spun yarn b in the Z-twist direction, thereby wrapping the thermally conductive core-spun yarn b around the sensing yarn in both the forward and reverse directions to form the wrapped core-sheath structure sensing thermally conductive yarn A. Finally, after being output through the output roller 29, it passes through the yarn guide hole 32 on the yarn guide traverse device 31 and is wound into a bobbin 33.

[0053] Step 4: First, twist the heat-insulating inorganic fibers to obtain heat-insulating inorganic fiber initial twist yarn; then twist the two reverse α-helical inorganic heat-insulating fiber initial twist yarns in the forward direction to obtain heat-insulating yarn c with a β double helix structure.

[0054] The processing procedure is largely the same as step 1, with the main difference being that the twisted filaments are heat-insulating inorganic fibers. These heat-insulating inorganic fibers can be one of the following: basalt filaments, glass fiber filaments, alumina fibers, ceramic fibers, or quartz fibers.

[0055] Step 5: First, twist several heat-insulating inorganic fiber multifilaments with flexible filaments to obtain heat-insulating inorganic fiber multifilaments, and feed them into the covering yarn forming zone of the spinning machine under a certain tension as core yarns; the fiber slivers prepared from flame-retardant and heat-insulating organic fibers are drawn into fiber slivers by the drawing system of the spinning machine. After being output by the drawing system, the flame-retardant and heat-insulating fiber slivers enter the covering yarn forming zone and merge with the core yarns, generating a covering twisting motion of core yarn rotation and flame-retardant and heat-insulating fiber revolution, so that the flame-retardant and heat-insulating fibers are evenly covered on the outer layer of the heat-insulating inorganic fiber multifilaments, forming a core-sheath structure heat-insulating core-spun yarn d.

[0056] The processing procedure is largely the same as step 2, with the main difference being the different fiber materials used.

[0057] Specifically, the thermal insulation inorganic fiber multifilament is composed of 10 to 300 thermal insulation inorganic fibers, which are one of the following: asbestos fiber, diatomaceous earth fiber, perlite fiber, calcium silicate fiber, and mullite fiber.

[0058] The flexible filament is one of the following: aramid filament, aramid sulfone filament, polybenzimidazole filament, polyphenylenepyridinium diimidazole filament, and alumina filament.

[0059] Flame-retardant and heat-insulating organic fibers are one of the following: polyimide fibers, flame-retardant gas gel fibers, hollow aramid fibers, flame-retardant blended fibers, cork ester fibers, polystyrene fibers, and polyurethane fibers.

[0060] Step 6: Using the heat-insulating yarn c prepared in step 4 as the core yarn and the heat-insulating core-spun yarn d prepared in step 5 as the outer wrapping yarn, cross-wound heat-insulating and flame-retardant yarn B is prepared by a filament wrapping spinning machine.

[0061] The insulating yarn c is output from the front roller through the drafting device and passes through the upper and lower hollow spindles respectively. The rotation of the upper and lower hollow spindles causes the insulating core-spun yarn d wound on the core-sheath structure of the hollow spindle to unwind and evenly cover the insulating yarn c. Specifically, the upper hollow spindle unwinds the insulating core-spun yarn d in the S-twist direction, and the lower hollow spindle unwinds the insulating core-spun yarn d in the Z-twist direction, thereby wrapping the insulating core-spun yarn d in the forward and reverse directions on the outer layer of the insulating yarn to obtain the cross-wound insulating flame-retardant yarn B. Finally, the insulating flame-retardant yarn B is wound on a bobbin to form a package.

[0062] Step 7: The upper layer uses the sensing and heat-conducting yarn A prepared in step 3, the lower layer uses the heat-insulating and flame-retardant yarn B prepared in step 6, and the two layers are connected together by high-strength yarn as a spacer to form a three-dimensional spacer fabric, thus obtaining the inorganic fiber double helix rotating core spun yarn intelligent knitted fabric.

[0063] In steps 2 and 5, the spinning machine is a ring spinning machine, a friction spinning machine, a vortex spinning machine, or a rotor spinning machine.

[0064] In steps 3 and 6, the filament wrapping spinning machine is a fancy twisting machine or a filament covering machine.

[0065] A smart knitted fabric made of inorganic fiber double-helix rotating core yarn was prepared using the aforementioned technical solution. This fabric is a three-layer knitted fabric composed of interlocking loops. The outer layer of the fabric is a thermally conductive and electrically conductive layer formed by interlocking sensing yarn loops. The sensing yarn used is a thermally conductive rotating core yarn with a β-double helix as the core and a thermally conductive fiber covering layer as the sheath. The core is a β-double helix yarn formed by forward twisting two opposing α-helical thermally conductive inorganic fiber single yarns. The sheath consists of thermally conductive fibers covering inorganic thermally conductive fibers. The core-sheath structure is a heat-conducting core-spun yarn; the inner layer of the fabric is a heat-insulating and flame-retardant layer formed by insulating yarn loops. The heat-insulating and flame-retardant yarn used is a heat-insulating core yarn with a β double helix as the yarn core and a flame-retardant and heat-insulating organic fiber covering layer as the yarn sheath. Its yarn core is a β double helix yarn formed by forward twisting two opposite α helix heat-insulating inorganic fiber single yarns. The yarn sheath is a core-sheath structure heat-insulating core-spun yarn with flame-retardant and heat-insulating organic fiber covering inorganic heat-insulating fiber; the middle layer is a high-strength, high-modulus yarn as a spacer connecting the inner and outer layers.

[0066] It should be understood that the inorganic fiber double helix rotating core spun yarn intelligent knitted fabric prepared by the present invention has a multi-layer structure and different functions. It can be a double-layer fabric connected by a single layer of spacer yarn, or a three-dimensional spacer knitted fabric with three or more layers.

[0067] This inorganic fiber double-helix rotating core-spun yarn intelligent knitted fabric is used in special work clothes, intelligent fire-fighting clothing, electronic component protective cases, robot intelligent clothing, military clothing, and military tents.

[0068] The following describes the processing method of the intelligent knitted fabric of inorganic fiber double helix rotating core spinning yarn provided by the present invention with reference to specific embodiments.

[0069] Example 1

[0070] Example 1 provides a method for processing intelligent knitted fabrics from inorganic fiber double-helix rotating core-spun yarn, the steps of which are as follows:

[0071] Step 1: At least one initially twisted thermally conductive inorganic fiber filament is output from the front nip of the ring spinning machine via the first fixed guide device 1, consisting of the front roller 4 and the front slip roller 3. At least one initially twisted thermally conductive inorganic fiber filament unwound from another bobbin is fed into the front nip of the ring spinning machine via the second fixed guide device 2, parallel to the initially twisted thermally conductive inorganic fiber filament. The two initially twisted inorganic fiber filaments are then twisted into yarn via the speed difference between the guide hook 5, the wire loop 8 on the ring 7, and the yarn tube on the bobbin support 6. The two initially twisted thermally conductive inorganic fiber filaments output from the front nip are forward twisted to form a β-double helix structure sensing yarn a, which is then wound onto a bobbin for later use. The twist is 20–40 twists / 10cm, and the twist direction is S-twist.

[0072] Step 2: The thermally conductive inorganic fiber initial twist composite yarn 9 and the flexible filament 10 are fed into the covering yarn forming area 30, which consists of a front roller 18, an auxiliary conveying unit 19, and a negative pressure adsorption component 21, under a certain tension. The thermally conductive fiber sliver is then stretched by the drafting system 20, which consists of a front roller 15, a middle roller 14, and a rear roller 13, to obtain a thermally conductive fiber sliver. After the thermally conductive inorganic composite yarn merges with the flexible filament to form a thermally conductive inorganic fiber initial twist composite yarn, it merges with the stretched sliver in the covering yarn forming area. After passing through the yarn guide hook 22, the thermally conductive inorganic fiber initial twist composite yarn rotates due to its own rotation, causing the thermally conductive fiber to revolve. This results in the fiber uniformly covering the outer layer of the thermally conductive inorganic fiber initial twist composite yarn, forming a core-sheath structure thermally conductive core-spun yarn b, and finally forming a cone yarn 23.

[0073] Step 3: The β-double helix structure sensing yarn a obtained in Step 1 is output from the nip formed by the front roller output 25 and the front skin roller 24 through the drafting device, passes through the upper hollow spindle 26, then through the false twister 27, and then through the lower hollow spindle 28. The upper and lower hollow spindles unwind the core-sheath structure thermally conductive core-spun yarn b on the hollow spindle by rotating in opposite directions and then wrap it around the β-double helix structure sensing yarn a prepared in Step 1. Specifically, the upper hollow spindle unwinds the thermally conductive core-spun yarn b in the S-twist direction, and the lower hollow spindle unwinds the thermally conductive core-spun yarn b in the Z-twist direction, thereby wrapping the thermally conductive core-spun yarn b around the sensing yarn in both the forward and reverse directions to form the sensing thermally conductive yarn A. Finally, after passing through the output roller 32, it passes through the yarn guide hole 32 on the yarn guide traverse device 31 and is wound into a bobbin yarn 33.

[0074] Step 4, the processing procedure is largely the same as step 1, the main difference being that the twisted filament is basalt filament. The prepared yarn is a β-double helix insulating yarn c.

[0075] Step 5, the processing procedure is largely the same as step 2, the main difference being the fiber materials used. Specifically, the insulating inorganic fiber multifilament consists of 300 insulating inorganic fibers, and the insulating organic fiber is polyimide fiber. The prepared yarn is a core-sheath structure insulating core-spun yarn d.

[0076] Step 6 is the same as step 3, except that the β double helix structure sensing yarn a is replaced with the β double helix structure heat insulation yarn c prepared in step 4, and the wrapping yarn is the core-sheath structure heat insulation core-spun yarn d prepared in step 5, forming heat insulation and flame retardant yarn B.

[0077] Step 7: The upper layer uses the sensing and heat-conducting yarn A prepared in step 3, the lower layer uses the heat-insulating and flame-retardant yarn B prepared in step 6, and high-strength yarn is used as a spacer to connect the upper and lower layers together to form a three-dimensional spacer fabric.

[0078] Comparative Examples 1-4

[0079] Comparative Examples 1-4 provide a method for processing intelligent knitted fabrics using inorganic fiber double-helix core-spun yarns. The main difference compared to Example 1 is that in Comparative Example 1, the two outer wrapping yarns were not covered and were directly twisted with flexible filaments before being used as outer wrapping yarns; in Comparative Example 2, the core yarns of the two yarns have a single-helix structure; in Comparative Example 3, the hollow spindle wrapping spinning method was not used, but the ring spinning twisting method shown in step 1 was directly used for helical wrapping; in Comparative Example 4, a machine weaving process was used to weave a double-layer fabric. Other experimental conditions were basically the same as in Example 1 and will not be elaborated further here.

[0080] Table 1 shows the performance test results of the inorganic fiber double-helix core-spun yarn smart knitted fabric and the mechanical property test results of the heat-insulating and flame-retardant yarn B prepared in Examples 1 and Comparative Examples 1-4. The electrical output performance is as follows: Figure 5 As shown.

[0081] TPP test

[0082] The TPP value of the intelligent knitted fabric made of inorganic fiber double helix rotating core spun yarn was tested using a thermal protection performance tester. The sample was placed on the test table for testing, and the time of second-degree burn was recorded after the test.

[0083] According to the formula TPP value (cal / cm) 2 =FT, calculate the TPP value of the sample;

[0084] F: Specified heat source heat flow (2.0 cal / (cm³)) 2 ·s))

[0085] T: Time (s) required to cause a second-degree burn.

[0086] Table 1 Performance test results of Example 1 and Comparative Examples 1-4

[0087]

[0088] From Table 1 and Figure 5 It can be seen that in Comparative Example 1, the two types of outer wrapping yarns were not coated, resulting in a decrease in the thermal protection performance of the fabric, as well as a deterioration in heat insulation and fabric strength. Due to the lack of coating treatment, the cohesion of the yarn and fiber aggregates weakened and the porosity increased, leading to a decrease in the fabric's thermal protection, heat insulation, and strength. At the same time, the lack of fiber coating also resulted in poorer contact electrostatic properties between fibers, reducing the fabric's electrical output performance.

[0089] In Comparative Example 2, neither of the two core yarns used a double helix structure, which reduced the overall bulkiness of the yarn during the wrapping process, weakened the insulation performance of the first layer, and worsened the fire resistance of the fabric. Meanwhile, in terms of electrical output, the double helix yarn exhibited more stable resilience and better performance than the single helix structure during contact separation and friction.

[0090] In Comparative Example 3, hollow spindle wrapping was not used. When ordinary ring spinning wraps yarn, it is done by twisting, i.e. spiral wrapping, which makes the yarns more tightly bound and reduces the static air content. As a result, the heat insulation performance of the fabric is worse. Using ring spinning spiral wrapping increases the exposure of the core yarn, which leads to more subsequent power loss and weaker power output performance.

[0091] Comparative Example 4 uses a woven fabric to prepare a double-layered fabric. During the weaving process, the outer and inner weft layers are tightly interwoven with the outer and inner warp layers, resulting in weak resilience. When in contact with a heat source, the tight bonding between the layers facilitates heat conduction, leading to poor insulation. In terms of electrical performance, the smaller deformation during contact reduces the probability of electron gain or loss, resulting in a weaker potential difference between the two surfaces, a smaller current, and a weaker electrical signal.

[0092] In summary, this invention employs a combined coating-wrapping spinning technique to prepare heat-insulating and flame-retardant yarn and sensing and heat-conducting yarn. These two yarns are used to weave a weft-knitted double-sided spacer fabric. The core-shell structure coating heat-insulating and flame-retardant yarn forms one layer, while the sensing and heat-conducting coating and wrapping yarn forms another layer. They are connected by interlocking loops to obtain an intelligent knitted fabric made from inorganic fiber double-helix rotating core-spun yarn. The prepared fabric possesses fire-resistant, flame-retardant, heat-insulating, and sensing properties, solving the problems of inorganic fibers and sensing yarns being difficult to weave into clothing and for use in knitting three-dimensional structures. This invention features a simple process, multi-functional fabric, and wide application. The prepared intelligent knitted fabric has a three-dimensional structure, fire resistance, flame retardancy, and thermal conductivity and sensing properties, making it suitable for the preparation of high-quality, multi-functional special equipment.

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for processing intelligent knitted fabrics from inorganic fiber double-helix rotating core-spun yarn, characterized in that, Includes the following steps: Step 1: First, twist the thermally conductive inorganic fibers to obtain the initial twisted thermally conductive inorganic fiber yarn; Then, the two opposing α-helical thermally conductive inorganic fiber filaments are twisted together in the forward direction to obtain the sensing yarn a with a β-double helix structure. Step 2: Twist several thermally conductive inorganic fiber multifilaments with flexible filaments to obtain thermally conductive inorganic fiber multifilaments. Feed them into the covering yarn forming zone of the spinning machine under a certain tension to serve as core yarns. Draft the fiber sliver prepared from the thermally conductive fibers into thermally conductive fiber slivers through the drafting system of the spinning machine. After being output from the drafting system, the thermally conductive fiber slivers enter the covering yarn forming zone and merge with the core yarns. This generates a covering twisting motion where the core yarns rotate and the thermally conductive fibers revolve, so that the thermally conductive fibers are evenly covered on the outer layer of the core yarns, forming a core-sheath structure thermally conductive core-spun yarn b. Step 3: Using the sensing yarn a prepared in Step 1 as the core yarn and the thermally conductive core-spun yarn b prepared in Step 2 as the outer wrapping yarn, cross-wound sensing and thermally conductive yarn is prepared by a filament wrapping spinning machine; the sensing yarn a is output from the front roller through the drafting device and passes through the upper and lower hollow spindles respectively. The rotation of the upper and lower hollow spindles causes the thermally conductive core-spun yarn b wound on the hollow spindles to unwind and evenly cover the sensing yarn a. The upper hollow spindle unwinds the heat-conducting core-spun yarn b in the S-twist direction, and the lower hollow spindle unwinds the heat-conducting core-spun yarn b in the Z-twist direction, thereby wrapping the heat-conducting core-spun yarn b in the forward and reverse directions on the outer layer of the sensing yarn to obtain the cross-wound sensing heat-conducting yarn A, and then winding the sensing heat-conducting yarn A on the bobbin to form a roll. Step 4: First, twist the heat-insulating inorganic fibers to obtain heat-insulating inorganic fiber initial twist yarn; then twist the two reverse α-helical heat-insulating inorganic fiber initial twist yarns in the forward direction to obtain heat-insulating yarn c with β double helix structure. Step 5: Twist several heat-insulating inorganic fiber multifilaments with flexible filaments to obtain heat-insulating inorganic fiber multifilaments, and feed them into the covering yarn forming zone of the spinning machine under a certain tension as core yarns; Draft the fiber sliver prepared from flame-retardant and heat-insulating organic fibers into fiber slivers through the drafting system of the spinning machine. After being output from the drafting system, the flame-retardant and heat-insulating fiber slivers enter the covering yarn forming zone and merge with the core yarns, generating a covering twisting motion of core yarn rotation and flame-retardant and heat-insulating fiber revolution, so that the flame-retardant and heat-insulating fibers are evenly covered on the outer layer of the heat-insulating inorganic fiber multifilaments, forming a core-sheath structure heat-insulating core-spun yarn d; Step 6: Using the insulating yarn c prepared in step 4 as the core yarn and the insulating core-spun yarn d prepared in step 5 as the outer wrapping yarn, cross-wound insulating and flame-retardant yarn B is prepared by a filament wrapping spinning machine; the insulating yarn c is output from the front roller through the drafting device and passes through the upper and lower hollow spindles respectively. The rotation of the upper and lower hollow spindles causes the insulating core-spun yarn d wound on the core-sheath structure of the hollow spindle to unwind and evenly cover the insulating yarn c. The upper hollow spindle unwinds the heat-insulating core-spun yarn d in the S-twist direction, and the lower hollow spindle unwinds the heat-insulating core-spun yarn d in the Z-twist direction, thereby wrapping the heat-insulating core-spun yarn d in the forward and reverse directions on the outer layer of the heat-insulating yarn to obtain the cross-wound heat-insulating and flame-retardant yarn B. Finally, the heat-insulating and flame-retardant yarn B is wound on the bobbin to form a roll. Step 7: The upper layer uses the sensing and heat-conducting yarn A prepared in step 3, the lower layer uses the heat-insulating and flame-retardant yarn B prepared in step 6, and the two layers are connected together by high-strength yarn as a spacer to form a three-dimensional spacer fabric, thus obtaining the inorganic fiber double helix rotating core spun yarn intelligent knitted fabric.

2. The processing method for intelligent knitted fabrics made from inorganic fiber double-helix rotating core-spun yarn according to claim 1, characterized in that, In steps 2 and 5, the spinning machine is a ring spinning machine, a friction spinning machine, a vortex spinning machine, or a rotor spinning machine; in steps 3 and 6, the filament wrapping spinning machine is a fancy twisting machine or a filament covering machine.

3. The processing method for intelligent knitted fabrics made from inorganic fiber double-helix rotating core-spun yarn according to claim 1, characterized in that, In step 2, the thermally conductive inorganic fiber multifilament is composed of 10 to 300 thermally conductive inorganic fibers, with a diameter of 20 to 30 μm for each fiber and a twist of 20 to 40 twists / 10 cm. The thermally conductive inorganic fiber is one of carbon fiber, graphene fiber, metal fiber, stainless steel fiber, aluminum alloy fiber, and silicon nitride fiber. The thermally conductive fiber is one of silicon carbide fiber, carbon nanotube fiber, and boron nitride fiber.

4. The processing method for intelligent knitted fabrics made from inorganic fiber double-helix rotating core-spun yarn according to claim 1, characterized in that, In step 2, the flexible filament is one of polyester filament, nylon filament, ultra-high molecular weight polyethylene filament, polypropylene filament, and acrylic filament.

5. The processing method for intelligent knitted fabrics made from inorganic fiber double-helix rotating core-spun yarn according to claim 1, characterized in that, In step 5, the flexible filament is one of aramid filament, aramid sulfone filament, polybenzimidazole filament, polyphenylenepyridinium diimidazole filament, and alumina filament.

6. The processing method for intelligent knitted fabrics made from inorganic fiber double-helix rotating core-spun yarn according to claim 1, characterized in that, In step 4, the heat-insulating inorganic fiber is one of basalt fiber, glass fiber, and alumina fiber.

7. The processing method for intelligent knitted fabrics made from inorganic fiber double-helix rotating core-spun yarn according to claim 1, characterized in that, In step 5, the thermal insulation inorganic fiber multifilament is composed of 10 to 300 thermal insulation inorganic fibers, which are one of asbestos fiber, diatomaceous earth fiber, perlite fiber, calcium silicate fiber, and mullite fiber.

8. The processing method for intelligent knitted fabrics made from inorganic fiber double-helix rotating core-spun yarn according to claim 1, characterized in that, In step 5, the flame-retardant and heat-insulating organic fiber is one of polyimide fiber, flame-retardant gas gel fiber, hollow aramid fiber, flame-retardant mixed fiber, cork ester fiber, polystyrene fiber, and polyurethane fiber.

9. A smart knitted fabric made of inorganic fiber double helix rotating core-spun yarn, characterized in that, The inorganic fiber double-helix rotating core-spun yarn intelligent knitted fabric is obtained by the processing method of the inorganic fiber double-helix rotating core-spun yarn intelligent knitted fabric according to any one of claims 1-8. The fabric is a knitted fabric with at least three layers formed by interlocking loops. The outer layer of the fabric is a thermally conductive and electrically conductive layer formed by interlocking sensing yarn loops. The sensing yarn used is a thermally conductive rotating core yarn with a β double helix as the yarn core and a thermally conductive fiber covering layer as the yarn sheath. Its yarn core is a β double helix yarn formed by forward twisting two opposing α-helical thermally conductive inorganic fiber single yarns. The yarn sheath is a core-sheath structure of thermally conductive fiber covered with inorganic thermally conductive fiber, which is a thermally conductive core-spun yarn. The inner layer of the fabric is a heat-insulating and flame-retardant layer formed by insulating yarn loops. The heat-insulating yarn used is a heat-insulating core yarn with a β double helix as the yarn core and a flame-retardant and heat-insulating organic fiber covering layer as the yarn sheath. Its yarn core is a β double helix yarn formed by two opposing α helix heat-insulating inorganic fiber single yarns twisted in the forward direction. The yarn sheath is a core-sheath structure of flame-retardant and heat-insulating organic fiber covered with inorganic heat-insulating fiber, which is a heat-insulating core-spun yarn. The middle layer is connected to the inner and outer layers by high-strength and high-modulus yarn as spacer yarn.

10. The application of the intelligent knitted fabric made of inorganic fiber double helix rotating core-spun yarn according to claim 9, characterized in that, The inorganic fiber double-helix rotating core-spun yarn intelligent knitted fabric is used in special work clothes, intelligent fire-fighting clothing, electronic component protective cases, robot intelligent clothing, military clothing, and military tents.

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