Tubular conductive heating fabric and method of weaving

Abstract

The present application belongs to the field of functional textile preparation, and particularly relates to a tubular conductive heating fabric prepared by using carbon conductive yarn and a preparation method thereof. The tubular conductive heating fabric comprises a straight pipe area and / or a bent pipe area; the number of knitting needles of each course of the straight pipe area is consistent; the number of knitting needles of each course of the bent pipe area is different; the bent pipe area is locally knitted, the knitting needles of the needle-increasing area temporarily exit knitting, the loops on the needles do not fall off the needles, and the knitting needles re-enter knitting when the needles need to be decreased, so that the effect of upper and lower connection is achieved; the straight pipe area and the bent pipe area both comprise one or several of an electrode area, a heating area and a non-heating area. The tubular conductive heating fabric is knitted by using a local knitting method, different parts are heated by integrated design and full-forming technology, no additional sewing or splicing steps are needed in the manufacturing process, and material waste and labor cost in the production process are reduced; the tubular conductive heating fabric is driven by 24V voltage, can realize heating at different temperatures, and ensures the use safety of the fabric.

Description

Technical Field

[0001] This invention belongs to the field of functional textile preparation, and particularly relates to a method for preparing tubular conductive and heating fabrics using carbon conductive yarns. Background Technology

[0002] With the rapid development of technology and the improvement of people's living standards, smart wearable devices and their functional fabrics have received widespread attention and application. Especially under extreme climatic conditions, conductive heating fabrics, with their unique electrothermal properties and comfort, have become a research hotspot in the field of smart clothing.

[0003] Currently, conductive heating fabrics are classified into three types based on their manufacturing methods: fabrics woven using conductive yarns, fabrics with heating materials directly embedded in the fabric, and fabrics that have undergone post-processing to produce conductive heating fabrics. Fabrics woven using conductive yarns mainly employ methods such as weaving, knitting, and embroidery. Compared to other weaving methods, knitting offers advantages such as directly creating the final product using a fully knitted process, saving yarn and cutting / sewing time, and represents the future trend in conductive heating fabric development.

[0004] This invention addresses the problem of poor fit and inadequate heating experience at curved joints in existing technologies by proposing a novel tubular conductive heating fabric and its weaving method. The tubular conductive heating fabric produced by this method not only possesses excellent conductivity and heating effect but also exhibits good flexibility, bending resistance, and fit, adapting to different movement requirements and providing users with a comfortable wearing experience. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a tubular conductive heating fabric, which solves the issue of poor fit in heating fabrics, adapts to different movement requirements, and provides a more comfortable heating experience. The tubular conductive heating fabric is woven in one piece, reducing subsequent cutting and sewing processes, saving time and effort.

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

[0007] A tubular conductive heating fabric includes a straight tube region and / or a curved tube region; the straight tube region has a consistent number of knitting needles per row; the curved tube region has a different number of knitting needles per row. The curved tube region uses a partial knitting method to temporarily remove the knitting needles from the knitting in the finishing area, without removing the loops from the needles. When it is necessary to release the needles, they re-enter the knitting, thereby achieving the effect of connecting the upper and lower parts; both the straight tube region and the curved tube region include one or more of the electrode region, the heating region, and the non-heating region.

[0008] Preferably, the tubular conductive heating fabric comprises two types of conductive yarns: one is a metal yarn used to weave the electrode area; the other is a carbon conductive yarn used to weave the heating area, which generates heat when energized.

[0009] Preferably, the metal yarn is one of stainless steel wire, silver-plated sewing thread, or nickel-plated copper-wrapped wire, with a resistance value of 0.01-200Ω / m.

[0010] Preferably, the resistance of the carbon conductive yarn is 0.1-100kΩ / m.

[0011] Preferably, the yarn in the non-heat-generating area is one or two of wool yarn, polyester yarn, and cotton yarn.

[0012] Preferably, the tubular conductive heating fabric has one or more of the following weft plain knit, 1-space-1 variation plain knit, and 2-space-2 variation plain knit.

[0013] The method for weaving the tubular conductive heating fabric includes the following steps:

[0014] (1) Process calculation: Based on the size and density of the straight tube area and / or curved tube area of ​​the tubular conductive heating fabric, as well as the width and number of electrode areas, and the length, width and number of heating areas, the number of knitting needles and the number of rows of the straight tube area and / or curved tube area are calculated;

[0015] The design of the number of warp rows in a needle bed knitting section of a straight tube area follows the formula:

[0016]

[0017] Where T is the number of warp rows in one needle bed, in units of rows; L is half the perimeter of the straight tube cross-section, in mm; P a The warp density of knitted fabrics is expressed in warp rows / 5cm.

[0018] The design of the number of braided rows in the straight pipe area follows the formula:

[0019]

[0020] Where H is the number of braided rows, in units; l is the straight tube length, in mm; P a The warp density of knitted fabric is expressed in warp rows / 5cm; P b The density of knitted fabric is expressed in rows / 5cm.

[0021] The length from the inner radius of the bend region to the i-th needle is designed according to the formula:

[0022] c=\frac {i\times 50} {{P}_{a}}\, \, \, i\in (0,T]

[0023] Where c is the length from the inner radius of the bend to the i-th needle, in mm; P a The warp density of knitted fabrics is expressed in warp rows / 5cm.

[0024] The number of rows knitted by the i-th needle in a loop within a curved tube region is designed according to the formula:

[0025] {c}_{i}=\frac {nπr{P}_{b}} {180N\times 50}+\frac {inπ{P}_{b}} {180N{P}_{a}}\, \, \, i\in (0,T]

[0026] Among them, C i P represents the number of rows knitted by the i-th needle in a single increase / decrease cycle; n is the angle corresponding to the bend, in degrees; r is the inner radius of the bend, in mm; N is the number of equal parts the bend is divided into; P a The warp density of knitted fabric is expressed in warp rows / 5cm; P b The density of knitted fabric is expressed in rows / 5cm.

[0027] (2) Determine the layout of the electrode area, heating area and non-heating area on the tubular conductive heating fabric: The electrode area is located on a fixed number of needles that run vertically through the fabric, and includes at least two electrode areas; the heating area is located between two adjacent electrode areas, and two or more electrode areas are connected in series or parallel to achieve heating; the non-heating area is located in a position other than the heating area and the electrode area.

[0028] (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area by color code 2, and the non-heating area by color code 3. The number of knitting needles, the number of rows, and the structure corresponding to each color code can be adjusted as needed.

[0029] (4) Pattern making: Based on the layout of the electrode area, heating area and non-heating area on the tubular conductive heating fabric, the color code setting and the needle movement, make a pattern; when making the pattern, ensure that the knitting sequence of the horizontal row without the increase and decrease area is: front needle bed - back needle bed - front needle bed - back needle bed; the knitting sequence of the horizontal row with the increase and decrease area is: front needle bed - back needle bed - back needle bed - front needle bed, that is, open on the side with the increase and decrease area and close on the side without the increase and decrease area.

[0030] (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

[0031] Preferably, in step (1), the knitted fabric has a warp density of 10-50 rows / 5cm and a weft density of 10-100 rows / 5cm.

[0032] After the tubular conductive heating fabric is woven off the machine, it can achieve heating at different temperatures by connecting the positive and negative terminals of an external power supply with a 24V input voltage.

[0033] Beneficial effects

[0034] (1) Knitted tubular conductive heating fabric achieves heating of different parts through integrated design and full molding technology. No additional sewing or splicing steps are required in the manufacturing process, reducing material waste and labor costs in the production process.

[0035] (2) Knitted tubular conductive heating fabric has good elasticity and stretchability, which can adapt to the needs of different movements and provide users with a comfortable wearing experience;

[0036] (3) The tubular conductive heating fabric can achieve heating at different temperatures by being driven by 24V voltage, ensuring the safety of the fabric. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0038] Figure 1 This is an effect diagram of the tubular conductive heating fabric in Embodiment 1 of the present invention;

[0039] Figure 2 This is an effect diagram of the tubular conductive heating fabric in Embodiment 2 of the present invention;

[0040] Figure 3 This is an effect diagram of the tubular conductive heating fabric in Embodiment 3 of the present invention;

[0041] Figure 4 This is an effect diagram of the tubular conductive heating fabric in Embodiment 4 of the present invention;

[0042] Figure 5 This is an effect diagram of the tubular conductive heating fabric in Embodiment 5 of the present invention;

[0043] Figure 6 This is an effect diagram of the tubular conductive heating fabric in Embodiment 6 of the present invention;

[0044] In the diagram: 1-Heating area, 2-Non-heating area, 3-Electrode area I, 4-Electrode area II, 5-Electrode area III. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Example 1

[0048] A tubular conductive heating fabric is composed of a curved tube region. The number of knitting needles in each row of the curved tube region varies. The curved tube region uses a partial knitting method to temporarily remove the knitting needles from the knitting in the needle-removing area, without removing the loops from the needles. When it is necessary to release the needles, they re-enter the knitting, thereby achieving the effect of connecting the upper and lower parts. The curved tube region includes an electrode region, a heating region 1, and a non-heating region 2. The angle corresponding to the curved tube is 60°, the inner radius of the curved tube is 50mm, and the perimeter of the curved tube cross section is 220mm.

[0049] The tubular conductive heating fabric contains two types of conductive yarns: one is silver-plated sewing thread, used to weave the electrode area, with a resistance of 180Ω / m; the other is carbon conductive yarn, used to weave the heating area 1, which heats up when energized, with a resistance of 10kΩ / m; the non-heating area 2 of the tubular conductive heating fabric is made of wool yarn; the knitted fabric has a warp density of 22 rows / 5cm and a weft density of 25 rows / 5cm; the electrode area, heating area 1, and non-heating area 2 are constructed with plain weft knit.

[0050] The method for weaving the above-mentioned tubular conductive heating fabric includes the following steps:

[0051] (1) Process calculation: Based on the dimensions and density of the curved area of ​​the tubular conductive heating fabric, and the electrode area width of 10mm, the number of electrode areas is 2; the length of heating area 1 is 10mm, the width of heating area 1 is 200mm, and the number of heating areas 1 is 2; the curved tube is divided into 2 equal parts. Substitute into the formula to calculate the number of knitting needles and the number of rows of the electrode area, heating area 1, and non-heating area 2;

[0052] (2) Determine the layout of the electrode area, heating area 1, and non-heating area 2 on the tubular conductive heating fabric: The electrode area is located on several needles that run vertically through both ends of the front and rear needle beds; the heating area 1 is located between electrode area I3 and electrode area II4 in the curved tube area, and is in a ring shape in the curved tube area; the non-heating area 2 is located in a position other than the heating area 1 and the electrode area.

[0053] (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area 1 is represented by color code 2, and the non-heating area 2 is represented by color code 3;

[0054] (4) Pattern making: Make patterns for the electrode area, heating area 1 and non-heating area 2. When making patterns, ensure that the knitting sequence of the horizontal row without the increase and decrease needle area is: front needle bed - back needle bed - front needle bed - back needle bed; and the knitting sequence of the horizontal row with the increase and decrease needle area is: front needle bed - back needle bed - back needle bed - front needle bed.

[0055] (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

[0056] After the tubular conductive heating fabric is woven off the machine, the metal electrode areas at the left and right ends are connected by wires. When the input voltage is 24V, the temperature of the tubular conductive heating fabric reaches 40℃.

[0057] Example 2

[0058] A tubular conductive heating fabric includes a straight tube region and a curved tube region. The straight tube region has a consistent number of knitting needles per row. The curved tube region has a different number of knitting needles per row. The curved tube region uses a partial knitting method to temporarily remove the knitting needles from the knitting in the finishing area, without removing the loops from the needles. When it is necessary to release the needles, they re-enter the knitting, thereby achieving the effect of connecting the upper and lower sections. The straight tube region includes an electrode region and a non-heating region 2. The total length of the straight tube is 80 mm, and the circumference of the straight tube cross section is 220 mm. The curved tube region includes an electrode region, a heating region 1, and a non-heating region 2. The angle corresponding to the curved tube is 90°, the inner radius of the curved tube is 50 mm, and the circumference of the curved tube cross section is 220 mm.

[0059] The tubular conductive heating fabric contains two types of conductive yarns: one is stainless steel wire, used to weave the electrode area, with a resistance of 130Ω / m; the other is carbon conductive yarn, used to weave the heating area 1, which heats up when energized, with a resistance of 10kΩ / m; the non-heating area 2 of the tubular conductive heating fabric is made of wool yarn; the knitted fabric has a warp density of 22 rows / 5cm and a weft density of 25 rows / 5cm; the electrode area, heating area 1, and non-heating area 2 are constructed with plain weft knit.

[0060] The method for weaving the above-mentioned tubular conductive heating fabric includes the following steps:

[0061] (1) Process calculation: Based on the dimensions and density of the straight and curved areas of the tubular conductive heating fabric, the electrode area is 10mm wide and there are 2 electrode areas; the heating area 1 is 10mm long and 200mm wide and there are 4 heating areas; the curved area is divided into 4 equal parts. Substitute these values ​​into the formula to calculate the number of knitting needles and the number of rows for the electrode area, heating area 1, and non-heating area 2;

[0062] (2) Determine the layout of the electrode area, heating area 1, and non-heating area 2 on the tubular conductive heating fabric: The electrode area is located on several needles that run vertically through both ends of the front and rear needle beds; the heating area 1 is located between electrode area I3 and electrode area II4 in the curved tube area, and is in a ring shape in the curved tube area; the non-heating area 2 is located in a position other than the heating area 1 and the electrode area.

[0063] (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area 1 is represented by color code 2, and the non-heating area 2 is represented by color code 3;

[0064] (4) Pattern making: Make patterns for the electrode area, heating area 1 and non-heating area 2. When making patterns, ensure that the knitting sequence of the horizontal row without the increase and decrease needle area is: front needle bed - back needle bed - front needle bed - back needle bed; and the knitting sequence of the horizontal row with the increase and decrease needle area is: front needle bed - back needle bed - back needle bed - front needle bed.

[0065] (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

[0066] After the tubular conductive heating fabric is woven off the machine, the metal electrode areas at the left and right ends are connected by wires. When the input voltage is 24V, the temperature of the tubular conductive heating fabric reaches 44℃.

[0067] Example 3

[0068] A tubular conductive heating fabric includes a straight tube region and a curved tube region. The straight tube region has a consistent number of knitting needles per row; the curved tube region has a different number of knitting needles per row. The curved tube region uses a partial knitting method to temporarily remove the knitting needles from the knitting in the finishing area, without removing the loops from the needles. When it is necessary to release the needles, they re-enter the knitting, thereby achieving the effect of connecting the upper and lower sections. The straight tube region includes an electrode region, a heating region 1, and a non-heating region 2. The total length of the straight tube is 80 mm, and the circumference of the straight tube cross section is 220 mm. The curved tube region includes an electrode region and a non-heating region 2. The angle corresponding to the bend is 90°, the inner radius of the bend is 50 mm, and the circumference of the bend cross section is 220 mm.

[0069] The tubular conductive heating fabric contains two types of conductive yarns: one is stainless steel wire, used to weave the electrode area, with a resistance of 75Ω / m; the other is carbon conductive yarn, used to weave heating area 1, which heats up when energized, with a resistance of 10kΩ / m; the non-heating area 2 of the tubular conductive heating fabric is made of polyester yarn; the knitted fabric has a warp density of 21 rows / 5cm and a weft density of 39 rows / 5cm; the structure of the electrode area, heating area 1, and non-heating area 2 is a plain knit with alternating 1-row stitches.

[0070] The method for weaving the above-mentioned tubular conductive heating fabric includes the following steps:

[0071] (1) Process calculation: Based on the dimensions and density of the straight and curved areas of the tubular conductive heating fabric, the electrode area is 10mm wide and there are 2 electrode areas; the heating area 1 is 10mm long and 200mm wide and there are 4 heating areas; the curved tube is divided into 6 equal parts. Substitute these values ​​into the formula to calculate the number of knitting needles and the number of rows for the electrode area, heating area 1, and non-heating area 2;

[0072] (2) Determine the layout of the electrode area, heating area 1, and non-heating area 2 on the tubular conductive heating fabric: The electrode area is located on several needles that run vertically through both ends of the front and rear needle beds; the heating area 1 is located between electrode area I3 and electrode area II4 in the straight tube area, and is in a ring shape in the straight tube area; the non-heating area 2 is located in a position other than the heating area 1 and the electrode area.

[0073] (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area 1 is represented by color code 2, and the non-heating area 2 is represented by color code 3;

[0074] (4) Pattern making: Make patterns for the electrode area, heating area 1 and non-heating area 2. When making patterns, ensure that the knitting sequence of the horizontal row without the increase and decrease needle area is: front needle bed - back needle bed - front needle bed - back needle bed; and the knitting sequence of the horizontal row with the increase and decrease needle area is: front needle bed - back needle bed - back needle bed - front needle bed.

[0075] (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

[0076] After the tubular conductive heating fabric is woven off the machine, the metal electrode areas at the left and right ends are connected by wires. When the input voltage is 24V, the temperature of the tubular conductive heating fabric reaches 45℃.

[0077] Example 4

[0078] A tubular conductive heating fabric includes a straight tube region and a curved tube region. The straight tube region has a consistent number of knitting needles per row; the curved tube region has a different number of knitting needles per row. The curved tube region uses a partial knitting method to temporarily remove the knitting needles from the knitting in the finishing area, without removing the loops from the needles. When it is necessary to release the needles, they re-enter the knitting, thereby achieving the effect of connecting the upper and lower sections. Both the straight tube region and the curved tube region include an electrode region, a heating region 1, and a non-heating region 2. The total length of the straight tube is 80 mm, and the perimeter of the straight tube cross-section is 220 mm. The angle corresponding to the curved tube is 90°, the inner radius of the curved tube is 50 mm, and the perimeter of the curved tube cross-section is 220 mm.

[0079] The tubular conductive heating fabric contains two types of conductive yarns: one is silver-plated sewing thread, used to weave the electrode area, with a resistance of 100Ω / m; the other is carbon conductive yarn, used to weave the heating area 1, which heats up when energized, with a resistance of 10kΩ / m; the non-heating area 2 of the tubular conductive heating fabric is made of cotton yarn; the knitted fabric has a warp density of 19 rows / 5cm and a weft density of 43 rows / 5cm; the structure of the electrode area, heating area 1, and non-heating area 2 is a 2-spaced, 2-variable plain knit.

[0080] The method for weaving the above-mentioned tubular conductive heating fabric includes the following steps:

[0081] (1) Process calculation: Based on the dimensions and density of the straight and curved areas of the tubular conductive heating fabric, the electrode area is 10mm wide and there are 2 electrode areas; the heating area 1 is 10mm long and 200mm wide and there are 8 heating areas; the curved tube is divided into 4 equal parts. Substitute these values ​​into the formula to calculate the number of knitting needles and the number of rows for the electrode area, heating area 1, and non-heating area 2;

[0082] (2) Determine the layout of the electrode area, heating area 1, and non-heating area 2 on the tubular conductive heating fabric: The electrode area is located on several needles that run vertically through both ends of the front and rear needle beds; the heating area 1 is located between electrode area I3 and electrode area II4 in the straight tube area and the curved tube area, forming a ring in the straight tube area and the curved tube area; the non-heating area 2 is located in a position other than the heating area 1 and the electrode area.

[0083] (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area 1 is represented by color code 2, and the non-heating area 2 is represented by color code 3;

[0084] (4) Pattern making: Make patterns for the electrode area, heating area 1 and non-heating area 2. When making patterns, ensure that the knitting sequence of the horizontal row without the increase and decrease needle area is: front needle bed - back needle bed - front needle bed - back needle bed; and the knitting sequence of the horizontal row with the increase and decrease needle area is: front needle bed - back needle bed - back needle bed - front needle bed.

[0085] (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

[0086] After the tubular conductive heating fabric is woven off the machine, the metal electrode areas at the left and right ends are connected by wires. When the input voltage is 24V, the temperature of the tubular conductive heating fabric reaches 42℃.

[0087] Example 5

[0088] A tubular conductive heating fabric includes a straight tube region and a curved tube region. The straight tube region has a consistent number of knitting needles per row; the curved tube region has a different number of knitting needles per row. The curved tube region uses a partial knitting method to temporarily remove the knitting needles from the knitting in the finishing area, without removing the loops from the needles. When it is necessary to release the needles, they re-enter the knitting, thereby achieving the effect of connecting the upper and lower sections. The straight tube region includes an electrode region, a heating region 1, and a non-heating region 2. The total length of the straight tube is 80 mm, and the circumference of the straight tube cross section is 220 mm. The curved tube region includes the non-heating region 2. The angle corresponding to the bend is 90°, the inner radius of the bend is 50 mm, and the circumference of the bend cross section is 220 mm.

[0089] The tubular conductive heating fabric contains two types of conductive yarns: one is copper-plated nickel-wrapped yarn, used to weave the electrode area, with a resistance of 10Ω / m; the other is carbon conductive yarn, used to weave the heating area 1, which heats up when energized, with a resistance of 80kΩ / m; the non-heating area 2 of the tubular conductive heating fabric is made of cotton yarn; the knitted fabric has a warp density of 22 rows / 5cm and a weft density of 25 rows / 5cm; the electrode area, heating area 1, and non-heating area 2 are constructed with plain weft knit.

[0090] The method for weaving the above-mentioned tubular conductive heating fabric includes the following steps:

[0091] (1) Process calculation: Based on the dimensions and density of the straight and curved areas of the tubular conductive heating fabric, the electrode area is 10mm wide and there are 2 electrode areas; the heating area 1 is 10mm long and 30mm wide and there are 3 heating areas; the curved tube is divided into 6 equal parts. Substitute these values ​​into the formula to calculate the number of knitting needles and the number of rows for the electrode area, heating area 1, and non-heating area 2;

[0092] (2) Determine the layout of the electrode area, heating area 1, and non-heating area 2 on the tubular conductive heating fabric: the electrode area is located on several needles along the entire straight tube length of the front needle bed; the heating area is located between electrode area I3 and electrode area II4 in the straight tube area; the non-heating area 2 is located in a position other than heating area 1 and electrode area.

[0093] (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area 1 is represented by color code 2, and the non-heating area 2 is represented by color code 3;

[0094] (4) Pattern making: Make patterns for the electrode area, heating area 1 and non-heating area 2. When making patterns, ensure that the knitting sequence of the horizontal row without the increase and decrease needle area is: front needle bed - back needle bed - front needle bed - back needle bed; and the knitting sequence of the horizontal row with the increase and decrease needle area is: front needle bed - back needle bed - back needle bed - front needle bed.

[0095] (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

[0096] After the tubular conductive heating fabric is woven off the machine, the metal electrode areas at the left and right ends are connected by wires. When a 24V voltage is input, the temperature of the tubular conductive heating fabric reaches 30℃.

[0097] Example 6

[0098] A tubular conductive heating fabric is composed of straight tube regions. The number of knitting needles in each row of the straight tube regions is the same. The straight tube regions include an electrode region, a heating region 1, and a non-heating region 2. The total length of the straight tube is 80 mm, and the perimeter of the straight tube cross-section is 220 mm.

[0099] The tubular conductive heating fabric contains two types of conductive yarns: one is copper-plated nickel-wrapped yarn, used to weave the electrode area, with a resistance of 4.5Ω / m; the other is carbon conductive yarn, used to weave the heating area 1, which heats up when energized, with a resistance of 20kΩ / m; the non-heating area 2 of the tubular conductive heating fabric is made of polyester yarn; the knitted fabric has a warp density of 22 rows / 5cm and a weft density of 25 rows / 5cm; the electrode area, heating area 1, and non-heating area 2 are constructed with plain weft knit.

[0100] The method for weaving the above-mentioned tubular conductive heating fabric includes the following steps:

[0101] (1) Process calculation: Based on the dimensions and density of the straight tube area of ​​the tubular conductive heating fabric, the electrode area width is 10mm and the number of electrode areas is 3; the length of heating area 1 is 10mm, the width of heating area 1 is 50mm, and the number of heating areas 1 is 4. Substitute these values ​​into the formula to calculate the number of knitting needles and the number of rows for the electrode area, heating area 1, and non-heating area 2;

[0102] (2) Determine the layout of the electrode area, heating area 1, and non-heating area 2 on the tubular conductive heating fabric: The electrode area is located on several needles that run vertically through the front and rear needle beds at both ends and in the middle of the front needle bed; the heating area 1 is located between electrode area I3 and electrode area III5, and between electrode area II4 and electrode area III5. The three electrode areas are connected in series and parallel to achieve heating; the non-heating area 2 is located in a position other than the heating area 1 and the electrode area.

[0103] (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area 1 is represented by color code 2, and the non-heating area 2 is represented by color code 3;

[0104] (4) Pattern making: Pattern making is carried out for the electrode area, heating area 1 and non-heating area 2 to ensure the knitting order of the horizontal rows: front needle bed - back needle bed - front needle bed - back needle bed;

[0105] (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

[0106] After the tubular conductive heating fabric is woven off the machine, the metal electrode areas at the left and right ends are connected by wires. When the input voltage is 24V, the temperature of the tubular conductive heating fabric reaches 45℃.

Claims

1. A tubular electrically conductive heating fabric, characterized in that, The tubular conductive heating fabric includes a straight tube region and / or a curved tube region; the number of knitting needles in each row of the straight tube region is consistent; the number of knitting needles in each row of the curved tube region varies. The curved tube region uses a partial knitting method to temporarily remove the knitting needles from the knitting in the finishing area, without removing the loops from the needles. When it is necessary to release the needles, they re-enter the knitting, thereby achieving the effect of connecting the upper and lower parts; both the straight tube region and the curved tube region include one or more of the electrode region, heating region, and non-heating region. The tubular conductive heating fabric is determined based on the following process calculations and layout, and is obtained through the following weaving method: (1) Process calculation: Based on the size and density of the straight tube area and / or curved tube area of ​​the tubular conductive heating fabric, as well as the width and number of electrode areas, and the length, width and number of heating areas, the number of knitting needles and the number of rows in the straight tube area and / or curved tube area are calculated. The design of the number of warp rows in a needle bed knitting section of a straight tube follows the formula: Wherein, T is the number of needle bed knitting longitudinal rows, unit is piece; L is half of the straight pipe section circumference, unit is mm; P a is the knitting fabric horizontal density, unit is longitudinal row / 5 cm; The design of the number of braided rows in the straight pipe area follows the formula: Wherein, H is the number of knitting courses, unit: pieces; l is the length of straight pipe, unit: mm; P a is the horizontal density of knitted fabric, unit: courses / 5cm; P b is the vertical density of knitted fabric, unit: courses / 5cm; The length from the inner radius of the bend region to the i-th needle is designed according to the formula: c = i × 50 P a i ∈ 0 T Wherein, c is the length of the inside radius of the bend to the i th needle, in mm; P a is the knit fabric horizontal density, in courses / 5 cm; The number of rows knitted by the i-th needle in a loop within a curved tube region is designed according to the formula: c i = n π r P b 180 N × 50 + i n π P b 180 N P a i ∈ 0 T wherein C i is the number of courses knitted by the ith needle in one needle-in / needle-out cycle, in units of pieces; n is the angle corresponding to the elbow, in units of °; r is the radius of the inner side of the elbow, in units of mm; N is the number of parts into which the elbow is divided; P a is the course gauge of the knitted fabric, in units of wales / 5 cm; P b is the wale gauge of the knitted fabric, in units of courses / 5 cm; (2) Determine the layout of the electrode area, heating area and non-heating area on the tubular conductive heating fabric: The electrode area is located on a fixed number of needles that run vertically through the fabric, and includes at least two electrode areas; the heating area is located between two adjacent electrode areas, and two or more electrode areas are connected in series or parallel to achieve heating; the non-heating area is located in a position other than the heating area and the electrode area. (3) Set color codes: Set different color codes for the three areas respectively. The electrode area is represented by color code 1, the heating area by color code 2, and the non-heating area by color code 3. The number of knitting needles, the number of rows, and the structure corresponding to each color code can be adjusted as needed. (4) Pattern making: Based on the layout of the electrode area, heating area and non-heating area on the tubular conductive heating fabric, the color code setting and the needle action, make a pattern; when making the pattern, ensure that the knitting sequence of the horizontal row without the increase and decrease area is: front needle bed - back needle bed - front needle bed - back needle bed; the knitting sequence of the horizontal row with the increase and decrease area is: front needle bed - back needle bed - back needle bed - front needle bed, that is, open on the side with the increase and decrease area and close on the side without the increase and decrease area. (5) Weaving: Import the compiled program into the computer flat knitting machine and weave.

2. The tubular electrically conductive heating fabric of claim 1, wherein, The tubular conductive heating fabric comprises two types of conductive yarns: one is a metal yarn used to weave the electrode area; the other is a carbon conductive yarn used to weave the heating area, which generates heat when energized.

3. The tubular electrically conductive heating fabric of claim 2, wherein, The metal yarn is one of stainless steel wire, silver-plated stranded wire, or copper-plated silver-wrapped wire, with a resistance value of 0.01-200Ω / m.

4. The tubular electrically conductive heating fabric of claim 2, wherein, The resistance of the carbon conductive yarn is 0.1-100kΩ / m.

5. The tubular electrically conductive heating fabric of claim 1, wherein, The yarn in the non-heat-generating area is one or two of wool yarn, polyester yarn, and cotton yarn.

6. The tubular electrically conductive heating fabric of claim 1, wherein, The tubular conductive heating fabric has a weft plain knit, 1-spaced 1-variable plain knit, and 2-spaced 2-variable plain knit, or one or more of these weft plain knits.

7. The tubular electrically conductive heating fabric of claim 1, wherein, The step (1) has 10-50 wales / 5cm and 10-100 courses / 5cm. The step (1) has 10-50 wales / 5cm and 10-100 courses / 5cm.

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