An integrally formed multi-layer flexible fabric circuit

Abstract

The present invention belongs to the technical field of flexible circuits, and discloses an integrally formed multi-layer flexible fabric circuit, which includes a trunk circuit I, a branch circuit I, a trunk circuit II, and a branch circuit II according to functional layout classification, wherein the trunk circuit I is connected to the branch circuit I, the trunk circuit II is connected to the branch circuit II, the trunk circuit I is not connected to the trunk circuit II, and the branch circuit I is not connected to the branch circuit II; the trunk circuit I and the trunk circuit II form a "匚"-shaped area, and the branch circuit I and the branch circuit II are both located in the area; the circuit includes an insulating warp knitted fabric and a single conductive yarn a, a single conductive yarn b, and a plurality of conductive yarns X located therein at the same time; the conductive yarn a and the conductive yarn b are respectively the weft yarns inserted into the insulating warp knitted fabric from the left and right sides. The present invention has the advantages of being light, soft, and breathable, and has good ductility. It is integrally formed during weaving, and the integrity of the structure and the continuity of the yarn are maintained.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible circuits and relates to a multi-layer flexible fabric circuit formed integrally. Background Art

[0002] With the rapid development of technologies related to intelligent textiles, flexible circuits based on fabrics have received extensive attention due to their excellent flexibility and breathability, especially in the fields of motion recognition, health monitoring, etc. Traditional intelligent textiles usually combine rigid materials or semiconductors with fabrics through relatively thick wires, and their disadvantages of being bulky, easily worn, and unable to deform with the fabric cannot meet the diverse needs of people's lives. Therefore, a flexible circuit that is lightweight, soft, and conforms to the human skin has emerged. Flexible circuits are mainly composed of conductive materials such as metal nanoparticles, metal oxides, and conductive polymers doped and compounded with flexible substrates such as paper, film, and silica gel, and usually have high elasticity and wear resistance, but poor breathability. In contrast, flexible circuits based on fabrics have better flexibility and breathability, can achieve deformations such as bending, twisting, and stretching at any angle, and can meet the usage requirements of daily life.

[0003] Currently, common methods for preparing flexible circuits include: screen printing method, inkjet printing method, and conductive yarn introduction method.

[0004] The screen printing method is mainly used to prepare fabric sensors. For example, patent application US20230181110A1 discloses a fabric circuit system for infant health monitoring. Specifically, a flexible printed circuit is integrated into an infant suit, and a temperature sensor is connected through circuit layout design to transmit the collected temperature signal. Patent application US20230358570A1 discloses a strain sensing system for vehicles. A sensing circuit or a shielding circuit is formed on a flexible insulating substrate such as fabric by screen printing using conductive ink. The substrate is an elastic memory film or fabric, which can reduce the damage of the printed circuit on the fabric surface during repeated stretching and relaxation. The literature ("Circuit Design and Performance of Electrothermal Composite Fabrics" [J]. Dyeing & Finishing, 2020, 46(03): 1-4+14.) proposes a method using silver paste as the conductive and heating material. A series or parallel circuit is printed on a thermoplastic polyurethane (TPU) film by screen printing, then laminated and encapsulated with a second TPU film, and finally two polyester fabrics are laminated on the upper and lower surfaces to prepare a flexible electrothermal composite fabric. Its circuit is divided into two types: series and parallel, which serves as both a conductive circuit and a heating material. Because two layers of film and two layers of fabric are laminated, the final fabric has a large gram weight and is not breathable. Another prior art using a similar method is patent application CN202310911132.9, which discloses a large-size double / multi-layer flexible fabric substrate thin-film circuit and its preparation method. The preparation method is to screen print two separate circuit layers on two layers of thermoplastic films using conductive paste. Flexible fabric circuits should meet certain mechanical property requirements. Most printing is carried out under low mechanical stress, and the resistance of the printed flexible circuit will change during the stretching process. For complex circuits, the change in wire resistance will affect the normal operation of the entire connecting wire.

[0005] Inkjet printing is a rapid additive manufacturing method that sprays ink droplets onto a substrate to form a conductive pattern. This method features non-contact, high resolution, high precision, and digital rapid prototyping. For example, Patent ZL202222414823.1 discloses a flexible stretch-resistant printed circuit fabric, whose circuit is arranged in a wavy pattern on the conductive layer and can stretch along with the fabric. By cooperating with the printed circuit made of conductive silver paste and sensors, it can collect human signals when in contact with the human body. However, during inkjet printing, the dispersed silver particles are likely to block the nozzles, and it is necessary to optimize the ink formula and inkjet printing process to improve the ink printing ability. Moreover, the printed pattern must be sintered at high temperature to obtain conductivity, which will cause irreversible damage to the fabric substrate. Secondly, the thickness of the cured conductive material deposited by inkjet printing is usually less than 1μm, making it difficult to print a continuous conductive layer on a fabric with a relatively rough surface. A similar prior art is Patent Application CN202310283345.1. When using this method to print a printed circuit on a fabric, it often exhibits poor ductility and stability as the fabric bends and stretches.

[0006] The method of introducing conductive yarn is to introduce conductive yarn into the fabric structure by using traditional weaving processes such as embroidery, weaving, and knitting to form conductive connecting wires. This kind of conductive fabric is light in weight and good in air permeability, having both the comfort of ordinary fabrics and excellent electrical conductivity. Introducing wires on the fabric surface by embroidery makes the fabric stiffer and reduces the overall extensibility of the fabric, which is not suitable for the circuit design of next-to-skin fabrics. For example, patent application CN202010072986.9 uses a weaving method to co-weave conductive metal wires and conductive tapes with insulated surfaces into a fabric circuit. Patent ZL201720616339.3 and patent application CN201810417358.2 respectively use weaving and knitting methods to co-weave conductive wires and non-conductive wires into plain fabrics. Patent ZL202122012574.9 inserts conductive yarn into the warp knitted fabric base in the form of weft insertion to achieve regular or irregular zigzag, wavy, and trapezoidal distributions of the conductive yarn. Patent application CN201010120005.X designs a double-layer conductive fabric, where the first layer and the second layer are respectively woven with conductive wires and non-conductive wires, and the non-conductive wires weave the first layer and the second layer together. The above-mentioned conductive-yarn-introduced conductive fabrics only introduce conductive yarn into the fabric base and do not introduce electrodes into the fabric to form a complete fabric circuit. Patent ZL202020922231.9 invented a fabric heating sheet, where the single-layer fabric layer is divided into an electrode part and a heating part, but some of the electrode yarns introduced into the fabric still need to be externally connected to a power source by wires, and a complete and integrated fabric circuit has not been truly achieved. Patent ZL202110495938.5 discloses a multi-layer woven machine-woven composite heating fabric, whose internal fabric circuit is formed by the interweaving of two groups of conductive warp and weft yarns respectively, and the warp yarns in the two groups of conductive yarns are woven with insulating yarns in a staggered layer to avoid contact with the conductive weft yarns of the other group. The two groups of conductive yarns of this fabric circuit can be directly connected to the electrodes without the need for additional external wires, but the multi-layer interweaving makes the fabric stiffer and has poor ductility.

[0007] Therefore, researching a truly complete flexible fabric circuit is of great significance for enhancing its flexibility and comfort in various application scenarios. Summary of the Invention

[0008] The purpose of the present invention is to solve the problems existing in the prior art and provide a multi-layer flexible fabric circuit with integral molding.

[0009] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0010] An integrally formed multi-layer flexible fabric circuit includes a trunk circuit I, a branch circuit I, a trunk circuit II, and a branch circuit II according to functional layout, wherein the trunk circuit I is connected to the branch circuit I, the trunk circuit II is connected to the branch circuit II, the trunk circuit I is not connected to the trunk circuit II, and the branch circuit I is not connected to the branch circuit II;

[0011] The trunk circuit I and the trunk circuit II form a "匚"-shaped area, and the branch circuit I and the branch circuit II are both located in the area;

[0012] The resistance ratio of the trunk circuit I to the branch circuit I is not less than 6, and the resistance ratio of the trunk circuit II to the branch circuit II is not less than 6, so as to ensure that the current can be transmitted to the entire trunk circuit and the branch circuit, and avoid the current forming a closed loop in a partial length section of the trunk circuit and the branch circuit, and cannot be transmitted to the entire trunk circuit and the branch circuit;

[0013] Classification by composition structure includes insulating warp knitted fabric and single conductive yarn a, single conductive yarn b, and multiple (i.e., more than two) conductive yarns X located inside the insulating warp knitted fabric;

[0014] The conductive yarn a is a weft yarn inserted into the insulating warp knitted fabric from the left side, and the conductive yarn b is a weft yarn inserted into the insulating warp knitted fabric from the right side;

[0015] The main circuit I is composed of a part of the conductive yarn a and a part of the conductive yarn X in contact with it, and the branch circuit I is composed of another part of the conductive yarn a. The main circuit II is composed of a part of the conductive yarn b and another part of the conductive yarn X in contact with it, and the branch circuit II is composed of another part of the conductive yarn b.

[0016] As the preferred technical solution:

[0017] In the above-mentioned one-piece multi-layer flexible fabric circuit, the plurality of conductive yarns X include a plurality of (i.e., more than two) conductive yarns c, a plurality of (i.e., more than two) conductive yarns d, and a plurality of (i.e., more than two) conductive yarns e;

[0018] The plurality of conductive yarns c and the plurality of conductive yarns d respectively correspond to the front section and the rear section arranged along the warp direction after the plurality of conductive yarns Y are cut, and one end of the plurality of conductive yarns c and the plurality of conductive yarns d are exposed from the technical reverse side of the insulating warp knitted fabric;

[0019] The conductive yarn a is divided into two parts, the left part of the conductive yarn b is divided into a left front part and a left rear part arranged along the warp direction; the conductive yarn a is located at the front side of the left rear part of the conductive yarn b;

[0020] The main circuit I is composed of the left part of the conductive yarn a and the conductive yarn c in contact therewith, the branch circuit I is composed of the right part of the conductive yarn a, the main circuit II is composed of the left rear part of the conductive yarn b, the conductive yarn d in contact with the left rear part, the right part of the conductive yarn b, and the conductive yarn e in contact with the right part, and the branch circuit II is composed of the left front part of the conductive yarn b.

[0021] As described above, in an integrally formed multi-layer flexible fabric circuit, multiple conductive yarns Y are woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a warp-lining, weft-lining or looping manner; multiple conductive yarns e are woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a warp-lining, weft-lining or looping manner; when the conductive yarn Y or the conductive yarn e is woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a weft-lining manner, due to the good stretchability of the conductive yarn Y or the conductive yarn e in the warp direction, the stretching performance of the entire multi-layer flexible fabric circuit is excellent; when the conductive yarn Y or the conductive yarn e is woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a looping manner, the resistance of the main circuit I and the main circuit II is small.

[0022] As described above, in an integrally formed multi-layer flexible fabric circuit, all looping methods are selected from one of chain stitch, plain stitch, plush stitch, and twill stitch.

[0023] As described above, in an integrally formed multi-layer flexible fabric circuit, classified by the composition structure, it further includes electrodes located on the surface of the insulating warp knitted fabric, and one end of multiple conductive yarns c and multiple conductive yarns d exposed from the insulating warp knitted fabric are respectively connected to the positive electrode and the negative electrode of the electrode.

[0024] As described above, in an integrally formed multi-layer flexible fabric circuit, classified by the composition structure, it further includes a conductive yarn f located inside the insulating warp knitted fabric, and the conductive yarn f is in contact with both the branch circuit I and the branch circuit II.

[0025] As described above, in an integrally formed multi-layer flexible fabric circuit, the conductive yarn f is woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a warp-lining, weft-lining or looping manner.

[0026] As described above, in an integrally formed multi-layer flexible fabric circuit, the linear resistance of the conductive yarn f is 100 - 5000 Ω / cm, and the linear resistances of the conductive yarn a and the conductive yarn b are 0.01 - 1 Ω / cm, so that the current can act on the conductive yarn f as much as possible.

[0027] The present invention also provides an integrally formed multi-layer flexible fabric circuit, including an insulating weft knitted double-sided fabric and a single conductive yarn g and a single conductive yarn h located inside it at the same time;

[0028] The conductive yarn g and the conductive yarn h do not contact each other;

[0029] The conductive yarn g is divided into left and right parts. The left part is woven between the front coils and the back coils of the insulating weft-knitted double-sided fabric in a way of laying-in knitting, and the left part forms the main circuit III, while the right part forms the branch circuit III;

[0030] The conductive yarn h is divided into left and right parts. The right part is woven between the front coils and the back coils of the insulating weft-knitted double-sided fabric in a way of laying-in knitting, and the right part forms the main circuit IV, while the left part forms the branch circuit IV;

[0031] The resistance ratio of the main circuit III to the branch circuit III is not less than 6, and the resistance ratio of the main circuit IV to the branch circuit IV is not less than 6. This can ensure that the current can be transmitted to the entire main circuit and branch circuit, and prevent the current from forming a closed loop in some length segments of the main circuit and branch circuit, so that the current cannot be transmitted to the entire main circuit and branch circuit.

[0032] As a preferred technical solution:

[0033] For the integrally formed multi-layer flexible fabric circuit as described above, the right part of the conductive yarn g is a float yarn; the left part of the conductive yarn h is a float yarn.

[0034] For the integrally formed multi-layer flexible fabric circuit as described above, it further includes an electrode located on the surface of the insulating weft-knitted double-sided fabric; one ends of the conductive yarn g and the conductive yarn h are exposed from the same side of the insulating weft-knitted double-sided fabric and are respectively connected to the positive and negative electrodes.

[0035] For the integrally formed multi-layer flexible fabric circuit as described above, it further includes a conductive yarn i located inside the insulating weft-knitted double-sided fabric, and the conductive yarn i is in contact with both the branch circuit III and the branch circuit IV at the same time.

[0036] For the integrally formed multi-layer flexible fabric circuit as described above, the conductive yarn i is woven between the front coils and the back coils of the insulating weft-knitted double-sided fabric in a way of laying-in knitting.

[0037] For the integrally formed multi-layer flexible fabric circuit as described above, the linear resistance of the conductive yarn i is 100 - 5000 Ω / cm, and the linear resistances of the conductive yarn g and the conductive yarn h are 0.01 - 1 Ω / cm. In this way, the current can act on the conductive yarn i as much as possible.

[0038] Beneficial effects:

[0039] The integrally formed multi-layer flexible fabric circuit of the present invention is integrally formed during knitting, without cutting or only needing to be cut once, maintaining the integrity of the structure and the continuity of the yarns.

[0040] The integrally formed multi-layer flexible fabric circuit body of the present invention is an insulating warp knitted fabric or an insulating weft knitted double-sided fabric, which has good ductility, and the warp elongation and weft elongation can reach 30% and 15% respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 and Figure 2 Schematic diagram of an integrally formed multi-layer flexible fabric circuit according to Example 1 of the present invention;

[0042] Figure 3 This is a schematic diagram of an exploded view of an integrally formed multi-layer flexible fabric circuit according to Example 1 of the present invention;

[0043] Figure 4 This is an exploded schematic diagram of an integrally formed multi-layer flexible fabric circuit according to Example 2 of the present invention;

[0044] Figure 5 This is an exploded schematic diagram of an integrally formed multi-layer flexible fabric circuit according to Example 3 of the present invention;

[0045] Among them, 1 is an integrally formed multi-layer flexible fabric circuit, 2-1 is the technical front side of the insulating warp knitted fabric, 2-2 is the technical back side of the insulating warp knitted fabric, 3 is the conductive yarn X, 4 is the conductive yarn f, 5 is the conductive yarn b, 6 is the main circuit I, 7 is the branch circuit I, 8 is the main circuit II, and 9 is the branch circuit II. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0047] Example 1

[0048] An integrally formed multi-layer flexible fabric circuit, such as Figure 2 As shown, the functional layout classification includes a trunk circuit I6, a branch circuit I7, a trunk circuit II8, and a branch circuit II9. The trunk circuit I6 is connected to the branch circuit I7, the trunk circuit II8 is connected to the branch circuit II9, the trunk circuit I6 is not connected to the trunk circuit II8, and the branch circuit I7 is not connected to the branch circuit II9;

[0049] The trunk circuit I 6 and the trunk circuit II 8 form a "匚"-shaped area, and the branch circuit I 7 and the branch circuit II 9 are both located in the area;

[0050] The resistance ratio of the main circuit I 6 to the branch circuit I 7 is 6, and the resistance ratio of the main circuit II 8 to the branch circuit II 9 is 6;

[0051] As Figure 1 shown, the integrally formed multi-layer flexible fabric circuit 1 is classified by its composition structure into an insulating warp knitted fabric (composed of insulating yarns, the insulating yarns being polyacrylonitrile pre-oxidized yarns with a specification of 40s, divided into the process front side 2-1 and the process back side 2-2 of the insulating warp knitted fabric), electrodes located on the surface of the insulating warp knitted fabric, and a single conductive yarn a (the linear resistance of the conductive yarn a is 0.04 Ω / cm, and the conductive yarn a is formed by twisting 9 copper wires with a diameter of 0.03 mm), a single conductive yarn b 5 (the linear resistance of the conductive yarn b is 0.04 Ω / cm, and the conductive yarn b is formed by twisting 9 copper wires with a diameter of 0.03 mm), a conductive yarn X 3, and a conductive yarn f 4 (the conductive yarn f is a polyester fiber coated with carbon nanotube conductive paste with a specification of 70D and a linear resistance of 2000 Ω / cm);

[0052] The conductive yarn a is a weft yarn inserted into the insulating warp knitted fabric from the left side and consists of left and right parts;

[0053] The conductive yarn b 5 is a weft yarn inserted into the insulating warp knitted fabric from the right side and consists of left and right parts. The left part is divided into a left front part and a left rear part arranged along the warp direction;

[0054] The conductive yarn a is located in front of the left rear part of the conductive yarn b 5;

[0055] The conductive yarn X 3 is composed of multiple conductive yarns c, multiple conductive yarns d, and multiple (30) conductive yarns e (the linear resistance of the conductive yarn e is 0.04 Ω / cm, and the conductive yarn e is formed by twisting 9 copper wires with a diameter of 0.03 mm);

[0056] Multiple conductive yarns c and multiple conductive yarns d respectively correspond to the front and rear segments arranged along the warp direction formed after multiple (30) conductive yarns Y (the linear resistance of the conductive yarn Y is 0.04 Ω / cm, and the conductive yarn Y is formed by twisting 9 copper wires with a diameter of 0.03 mm) are cut. One end of each of the multiple conductive yarns c and multiple conductive yarns d exposes from the process back side 2-2 of the insulating warp knitted fabric and is respectively connected to the positive and negative electrodes;

[0057] The main circuit I 6 is composed of the left part of the conductive yarn a and the conductive yarn c in contact with it, the branch circuit I 7 is composed of the right part of the conductive yarn a, the main circuit II 8 is composed of the left rear part of the conductive yarn b 5, the conductive yarn d in contact with the left rear part, the right part of the conductive yarn b 5, and the conductive yarn e in contact with the right part, and the branch circuit II 9 is composed of the left front part of the conductive yarn b 5;

[0058] The conductive yarn f 4 is in contact with both the branch circuit I 7 and the branch circuit II 9;

[0059] like Figure 3 As shown, multiple conductive yarns Y are woven into the loop stem and extension line of the insulating warp knitted fabric in the form of warp lining; multiple conductive yarns e are woven into the loop stem and extension line of the insulating warp knitted fabric in the form of warp lining; conductive yarn f4 is woven into the loop stem and extension line of the insulating warp knitted fabric in the form of weft lining.

[0060] The method for preparing the above-mentioned integrated multi-layer flexible fabric circuit is as follows: a single needle bed warp knitting machine with two large transverse pattern combs and three ground combs is used for weaving, and the arrangement order of the combs from the front to the back of the machine is: GB1 (ground comb), GB2 (ground comb), GB3 (ground comb), PB1 (large transverse pattern comb), PB2 (large transverse pattern comb), during the weaving process, GB1 forms a warp flat, GB2 is used as a lining warp, GB3 is used as a 1-needle weft lining, and PB1 and PB2 are arranged in a straight line. Figure 3 The weft insertion movement is performed along the trajectory shown in the figure, and then the woven fabric is unloaded from the machine. Figure 3 As shown, the conductive yarn Y is cut and the electrodes are connected to obtain an integrally formed multi-layer flexible fabric circuit 1; wherein GB1 is fully penetrated with insulating yarn, GB2 is fully penetrated with 30 conductive yarns X on both sides, GB3 is fully penetrated with conductive yarn f, PB1 is penetrated with 1 conductive yarn a, and PB2 is penetrated with 1 conductive yarn b.

[0061] Example 2

[0062] An integrally formed multi-layer flexible fabric circuit, such as Figure 4 As shown, the functional layout classification includes trunk circuit I, branch circuit I, trunk circuit II, and branch circuit II. The trunk circuit I is connected to the branch circuit I, the trunk circuit II is connected to the branch circuit II, the trunk circuit I is not connected to the trunk circuit II, and the branch circuit I is not connected to the branch circuit II;

[0063] The trunk circuit I and the trunk circuit II form a "匚"-shaped area, and the branch circuit I and the branch circuit II are both located in the area;

[0064] The resistance ratio of the main circuit I to the branch circuit I is 10, and the resistance ratio of the main circuit II to the branch circuit II is 10;

[0065] Classified by the composition structure, it consists of an insulating warp knitted fabric (made of insulating yarns, the insulating yarns are flame-retardant nylon filaments with a specification of 100D / 48F), electrodes located on the surface of the insulating warp knitted fabric, and a single conductive yarn a (the wire resistance of conductive yarn a is 0.025 Ω / cm, and conductive yarn a is twisted from 12 copper wires with a diameter of 0.03 mm), a single conductive yarn b (the wire resistance of conductive yarn b is 0.025 Ω / cm, and conductive yarn b is twisted from 12 copper wires with a diameter of 0.03 mm), conductive yarn X, and conductive yarn f (conductive yarn f is pre-oxidized yarn low-temperature carbonized with a wire resistance of 3000 Ω / cm);

[0066] Conductive yarn a is a weft yarn inserted into the insulating warp knitted fabric from the left side and consists of left and right parts;

[0067] Conductive yarn b is a weft yarn inserted into the insulating warp knitted fabric from the right side and consists of left and right parts. The left part is divided into a left front part and a left rear part arranged along the warp direction;

[0068] Conductive yarn a is located on the front side of the left rear part of conductive yarn b;

[0069] Conductive yarn X is composed of multiple conductive yarns c, multiple conductive yarns d, and multiple (30) conductive yarns e (conductive yarn e is a copper wire with a diameter of 0.03 mm, twisted from 12 strands, and the wire resistance is 0.025 Ω / cm);

[0070] Multiple conductive yarns c and multiple conductive yarns d respectively correspond to the front and rear segments arranged along the warp direction formed after multiple (30) conductive yarns Y (conductive yarn Y is a copper wire with a diameter of 0.03 mm, twisted from 12 strands, and the wire resistance is 0.025 Ω / cm) are cut. One end of each of multiple conductive yarns c and multiple conductive yarns d exposes from the technical reverse side of the insulating warp knitted fabric and is respectively connected to the positive and negative electrodes;

[0071] The main circuit I is composed of the left part of conductive yarn a and the conductive yarn c in contact with it. The branch circuit I is composed of the right part of conductive yarn a. The main circuit II is composed of the left rear part of conductive yarn b, the conductive yarn d in contact with the left rear part, the right part of conductive yarn b, and the conductive yarn e in contact with the right part. The branch circuit II is composed of the left front part of conductive yarn b;

[0072] Conductive yarn f is in contact with both branch circuit I and branch circuit II at the same time;

[0073] Multiple conductive yarns Y are woven into the insulating warp knitted fabric between the loop and the extension line in the form of weft insertion; multiple conductive yarns e are woven into the insulating warp knitted fabric between the loop and the extension line in the form of weft insertion; conductive yarn f is woven into the insulating warp knitted fabric between the loop and the extension line in the form of warp insertion.

[0074] The method for preparing the above-mentioned integrated multi-layer flexible fabric circuit is as follows: a single needle bed warp knitting machine with two large transverse pattern combs and three ground combs is used for weaving, and the arrangement order of the combs from the front to the back of the machine is: GB1 (ground comb), GB2 (ground comb), GB3 (ground comb), PB1 (large transverse pattern comb), PB2 (large transverse pattern comb), during the weaving process, GB1 forms a warp flat, GB2 is used as a lining warp, GB3 is used as a 1-needle weft lining, and PB1 and PB2 are arranged in a straight line. Figure 3 The weft insertion movement is performed along the trajectory shown in the figure, and then the woven fabric is unloaded from the machine. Figure 3 As shown, the conductive yarn Y is cut and the electrodes are connected to obtain an integrated multi-layer flexible fabric circuit; wherein GB1 is fully penetrated with insulating yarn, GB2 is fully penetrated with 30 conductive yarns X on both sides, GB3 is fully penetrated with conductive yarn f, PB1 is penetrated with 1 conductive yarn a, and PB2 is penetrated with 1 conductive yarn b.

[0075] Example 3

[0076] An integrally formed multi-layer flexible fabric circuit, such as Figure 5 As shown, the functional layout classification includes trunk circuit I, branch circuit I, trunk circuit II, and branch circuit II. The trunk circuit I is connected to the branch circuit I, the trunk circuit II is connected to the branch circuit II, the trunk circuit I is not connected to the trunk circuit II, and the branch circuit I is not connected to the branch circuit II;

[0077] The trunk circuit I and the trunk circuit II form a "匚"-shaped area, and the branch circuit I and the branch circuit II are both located in the area;

[0078] The resistance ratio of the main circuit I to the branch circuit I is 20, and the resistance ratio of the main circuit II to the branch circuit II is 20;

[0079] According to the composition structure, it is composed of an insulating warp knitted fabric (composed of insulating yarn, which is wool yarn with a specification of 60Nm), an electrode located on the surface of the insulating warp knitted fabric, and a single conductive yarn a located inside the insulating warp knitted fabric (the line resistance of the conductive yarn a is 0.015Ω / cm, and the conductive yarn a is twisted by 7 copper wires with a diameter of 0.05mm), a single conductive yarn b (the line resistance of the conductive yarn b is 0.015Ω / cm, and the conductive yarn b is twisted by 12 copper wires with a diameter of 0.05mm), a conductive yarn X, and a conductive yarn f (the conductive yarn f is a pre-oxidized yarn carbonized at low temperature, and the line resistance is 5000Ω / cm);

[0080] The conductive yarn a is a weft yarn inserted into the insulating warp knitted fabric from the left side, and consists of two parts, left and right;

[0081] The conductive yarn b is a weft yarn inserted into the insulating warp knitted fabric from the right side, and is composed of two parts, the left part is divided into a left front part and a left rear part arranged along the warp direction;

[0082] The conductive yarn a is located on the front side of the left rear part of the conductive yarn b;

[0083] The conductive yarn X is composed of multiple conductive yarns c, multiple conductive yarns d, and multiple (30) conductive yarns e (the conductive yarn e is a copper wire with a diameter of 0.05 mm, twisted by 7 strands, and the wire resistance is 0.015 Ω / cm);

[0084] Multiple conductive yarns c and multiple conductive yarns d respectively correspond to the front section and the rear section arranged along the warp direction formed after multiple (30) conductive yarns Y (the conductive yarn Y is a copper wire with a diameter of 0.05 mm, twisted by 7 strands, and the wire resistance is 0.015 Ω / cm) are cut. One ends of multiple conductive yarns c and multiple conductive yarns d both expose from the technological reverse side of the insulating warp knitted fabric and are respectively connected to the positive electrode and the negative electrode of the electrode;

[0085] The main circuit I is composed of the left part of the conductive yarn a and the conductive yarn c in contact with it. The branch circuit I is composed of the right part of the conductive yarn a. The main circuit II is composed of the left rear part of the conductive yarn b, the conductive yarn d in contact with the left rear part, the right part of the conductive yarn b, and the conductive yarn e in contact with the right part. The branch circuit II is composed of the left front part of the conductive yarn b;

[0086] The conductive yarn f is in contact with both the branch circuit I and the branch circuit II simultaneously;

[0087] Multiple conductive yarns Y are woven into the loop and the extension line of the insulating warp knitted fabric in a looped (the looping method is chain stitch) manner; multiple conductive yarns e are woven into the loop and the extension line of the insulating warp knitted fabric in a looped (the looping method is chain stitch) manner; the conductive yarn f is woven into the loop and the extension line of the insulating warp knitted fabric in a looped (the looping method is plain stitch) manner.

[0088] The preparation method of the integrally formed multi - layer flexible fabric circuit as described above is as follows. The specific process is: using a single - needle - bed warp knitting machine with two large - shogging pattern combs and three ground combs. The arrangement order of the combs from the front of the machine to the back is: GB1 (ground comb), GB2 (ground comb), GB3 (ground comb), PB1 (large - shogging pattern comb), PB2 (large - shogging pattern comb). During the knitting process, GB1 forms plain stitch, GB2 makes inlay warp, GB3 makes 1 - needle inlay weft, and PB1 and PB2 do inlay weft movement according to the Figure 3 shown trajectory, and then the knitted fabric is taken off the machine. Cut the conductive yarn Y according to the Figure 3 shown, connect the electrodes, and then the integrally formed multi - layer flexible fabric circuit is obtained. Among them, GB1 is fully threaded with insulating yarn, both the left and right sides of GB2 are fully threaded with 30 conductive yarns X, GB3 is fully threaded with conductive yarn f, PB1 is threaded with 1 conductive yarn a, and PB2 is threaded with 1 conductive yarn b.

[0089] Example 4

[0090] An integrally formed multi-layer flexible fabric circuit includes a trunk circuit I, a branch circuit I, a trunk circuit II, and a branch circuit II according to functional layout, wherein the trunk circuit I is connected to the branch circuit I, the trunk circuit II is connected to the branch circuit II, the trunk circuit I is not connected to the trunk circuit II, and the branch circuit I is not connected to the branch circuit II;

[0091] The trunk circuit I and the trunk circuit II form a "匚"-shaped area, and the branch circuit I and the branch circuit II are both located in the area;

[0092] The resistance ratio of the main circuit I to the branch circuit I is 15, and the resistance ratio of the main circuit II to the branch circuit II is 15;

[0093] According to the composition structure, it is composed of an insulating warp knitted fabric (composed of insulating yarn, the insulating yarn is flame-retardant polyester, and the specification is 100D / 48F), an electrode located on the surface of the insulating warp knitted fabric, and a single conductive yarn a located inside the insulating warp knitted fabric (the line resistance of the conductive yarn a is 0.04Ω / cm, and the conductive yarn a is twisted by 9 copper wires with a diameter of 0.03mm), a single conductive yarn b (the line resistance of the conductive yarn b is 0.04Ω / cm, and the conductive yarn b is twisted by 9 copper wires with a diameter of 0.03mm), a conductive yarn X, and a conductive yarn f (the conductive yarn f is a pre-oxidized yarn carbonized at low temperature, and the line resistance is 5000Ω / cm);

[0094] The conductive yarn a is a weft yarn inserted into the insulating warp knitted fabric from the left side, and consists of two parts, left and right;

[0095] The conductive yarn b is a weft yarn inserted into the insulating warp knitted fabric from the right side, and is composed of two parts, the left part is divided into a left front part and a left rear part arranged along the warp direction;

[0096] The conductive yarn a is located at the front side of the left rear portion of the conductive yarn b;

[0097] The conductive yarn X is composed of a plurality of conductive yarns c, a plurality of conductive yarns d, and a plurality of (30) conductive yarns e (the conductive yarn e is a copper wire with a diameter of 0.03 mm, which is twisted by 9 strands and has a line resistance of 0.04 Ω / cm);

[0098] The plurality of conductive yarns c and the plurality of conductive yarns d correspond to the front section and the rear section arranged along the warp direction formed by cutting a plurality of (30) conductive yarns Y (the conductive yarn Y is a copper wire with a diameter of 0.03 mm, which is twisted by 9 strands and has a line resistance of 0.04 Ω / cm), respectively. One end of the plurality of conductive yarns c and the plurality of conductive yarns d are exposed from the technical reverse side of the insulating warp knitted fabric and are respectively connected to the positive electrode and the negative electrode of the electrode;

[0099] The main circuit I is composed of the left part of the conductive yarn a and the conductive yarn c in contact with it. The branch circuit I is composed of the right part of the conductive yarn a. The main circuit II is composed of the left rear part of the conductive yarn b, the conductive yarn d in contact with the left rear part, the right part of the conductive yarn b, and the conductive yarn e in contact with the right part. The branch circuit II is composed of the left front part of the conductive yarn b;

[0100] The conductive yarn f is in contact with both the branch circuit I and the branch circuit II at the same time;

[0101] Multiple conductive yarns Y are woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a looped (the looping method is plain warp) manner; multiple conductive yarns e are woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a looped (the looping method is plain warp) manner; the conductive yarn f is woven between the loop stems and the extension yarns of the insulating warp knitted fabric in a looped (the looping method is chain stitch) manner.

[0102] The preparation method of the integrally formed multi-layer flexible fabric circuit as described above is as follows: A single needle bed warp knitting machine with two large cross-lapping combs and three ground combs is used for knitting. The arrangement order of the combs from the front of the machine to the back is: GB1 (ground comb), GB2 (ground comb), GB3 (ground comb), PB1 (large cross-lapping comb), PB2 (large cross-lapping comb). During the knitting process, GB1 forms plain warp, GB2 does inlay warp, GB3 does 1 needle inlay weft, and PB1 and PB2 do inlay weft movement according to the Figure 3 shown trajectory, and then the knitted fabric is taken off the machine, and the conductive yarn Y is cut according to the Figure 3 shown, and the electrodes are connected to obtain the integrally formed multi-layer flexible fabric circuit; among them, GB1 is fully threaded with insulating yarn, both the left and right sides of GB2 are fully threaded with 30 conductive yarns X, GB3 is fully threaded with the conductive yarn f, PB1 is threaded with 1 conductive yarn a, and PB2 is threaded with 1 conductive yarn b.

[0103] Example 5

[0104] An integrally formed multi-layer flexible fabric circuit is composed of an insulating weft knitted double-sided fabric (composed of insulating yarn, the insulating yarn is polyacrylonitrile pre-oxidized yarn, with a specification of 40s), electrodes located on the surface of the insulating weft knitted double-sided fabric, and a single conductive yarn g (the linear resistance of the conductive yarn g is 0.04 Ω / cm, and the conductive yarn g is twisted from 9 copper wires with a diameter of 0.03 mm), a single conductive yarn h (the linear resistance of the conductive yarn h is 0.04 Ω / cm, and the conductive yarn h is twisted from 9 copper wires with a diameter of 0.03 mm), and a conductive yarn i (the conductive yarn i is a polyester fiber coated with carbon nanotube conductive paste, with a specification of 70D and a linear resistance of 2000 Ω / cm) located inside the insulating weft knitted double-sided fabric at the same time;

[0105] The conductive yarn g and the conductive yarn h are not in contact;

[0106] One end of the conductive yarn g and the conductive yarn h is exposed from the same side of the insulating weft knitted double-sided fabric and is respectively connected to the positive electrode and the negative electrode of the electrode;

[0107] The conductive yarn g is divided into left and right parts. The left part is knitted between the front coils and the back coils of the insulating weft knitted double-sided fabric in the way of plating stitch. The right part is a float yarn. The left part constitutes the main circuit III, and the right part constitutes the branch circuit III;

[0108] The conductive yarn h is divided into left and right parts. The right part is knitted between the front coils and the back coils of the insulating weft knitted double-sided fabric in the way of plating stitch. The left part is a float yarn. The right part constitutes the main circuit IV, and the left part constitutes the branch circuit IV;

[0109] The resistance ratio of the main circuit III to the branch circuit III is 6, and the resistance ratio of the main circuit IV to the branch circuit IV is 6;

[0110] The conductive yarn i is in contact with both the branch circuit III and the branch circuit IV at the same time;

[0111] The conductive yarn i is knitted between the front coils and the back coils of the insulating weft knitted double-sided fabric in the way of plating stitch.

[0112] The preparation method of the integrally formed multi-layer flexible fabric circuit as described above is as follows: On a computerized flat knitting machine with a gauge of 18 needles, 4 yarn feeders are used for knitting to form an electrothermal fabric. The yarn feeders from left to right are YG1, YG2, YG3, and YG4. YG1 and YG2 knit rib plating stitch on the left side of the fabric. YG1 and YG3 knit rib plating stitch in the middle of the fabric. YG1 and YG4 knit rib plating stitch on the right side of the fabric. YG2 and YG4 respectively bring the yarn i area through float yarns to connect the electrodes. Among them, YG1 is threaded with insulating yarn, YG2 is threaded with conductive yarn g, YG3 is threaded with conductive yarn i, and YG4 is threaded with conductive yarn h.

[0113] Example 6

[0114] An integrally formed multi-layer flexible fabric circuit is composed of an insulating weft knitted double-sided fabric (made of insulating yarn, the insulating yarn is a flame-retardant nylon filament with a specification of 100D / 48F), electrodes located on the surface of the insulating weft knitted double-sided fabric, and a single conductive yarn g (the linear resistance of the conductive yarn g is 0.025 Ω / cm, and the conductive yarn g is twisted from 12 copper wires with a diameter of 0.03 mm), a single conductive yarn h (the linear resistance of the conductive yarn h is 0.025 Ω / cm, and the conductive yarn g is twisted from 12 copper wires with a diameter of 0.03 mm), and a conductive yarn i (the conductive yarn i is pre-oxidized yarn low-temperature carbonized, and the linear resistance is 3000 Ω / cm) located inside the insulating weft knitted double-sided fabric at the same time;

[0115] The conductive yarn g and the conductive yarn h do not contact;

[0116] One end of the conductive yarn g and the conductive yarn h is exposed from the same side of the insulating weft knitted double-sided fabric and is respectively connected to the positive electrode and the negative electrode of the electrode;

[0117] The conductive yarn g is divided into left and right parts. The left part is knitted between the front coils and the back coils of the insulating weft knitted double-sided fabric in the way of plating stitch. The right part is a float yarn. The left part constitutes the main circuit III, and the right part constitutes the branch circuit III;

[0118] The conductive yarn h is divided into left and right parts. The right part is knitted between the front coils and the back coils of the insulating weft knitted double-sided fabric in the way of plating stitch. The left part is a float yarn. The right part constitutes the main circuit IV, and the left part constitutes the branch circuit IV;

[0119] The resistance ratio of the main circuit III to the branch circuit III is 8, and the resistance ratio of the main circuit IV to the branch circuit IV is 8;

[0120] The conductive yarn i is in contact with both the branch circuit III and the branch circuit IV simultaneously;

[0121] The conductive yarn i is knitted between the front coils and the back coils of the insulating weft knitted double-sided fabric in the way of plating stitch.

[0122] The preparation method of the integrally formed multi-layer flexible fabric circuit as described above is as follows: On a computer flat knitting machine with a gauge of 18 needles, 4 yarn feeders are used for knitting to form an electrothermal fabric. The yarn feeders are YG1, YG2, YG3, and YG4 from left to right. YG1 and YG2 knit rib plating stitch on the left side of the fabric. YG1 and YG3 knit rib plating stitch in the middle of the fabric. YG1 and YG4 knit rib plating stitch on the right side of the fabric. YG2 and YG4 respectively bring the yarn i area through float yarns to make the electrodes connected; among them, YG1 is threaded with insulating yarn, YG2 is threaded with conductive yarn g, YG3 is threaded with conductive yarn i, and YG4 is threaded with conductive yarn h.

[0123] Example 7

[0124] An integrally formed multi-layer flexible fabric circuit is composed of an insulating weft knitted double-sided fabric (made of insulating yarn, the insulating yarn is wool yarn, and the specification is 60 Nm), electrodes located on the surface of the insulating weft knitted double-sided fabric, and a single conductive yarn g (the linear resistance of the conductive yarn g is 0.015 Ω / cm, and the conductive yarn g is twisted by 7 copper wires with a diameter of 0.05 mm), a single conductive yarn h (the linear resistance of the conductive yarn h is 0.015 Ω / cm, and the conductive yarn h is twisted by 7 copper wires with a diameter of 0.05 mm), and a conductive yarn i (the conductive yarn i is pre-oxidized yarn low-temperature carbonized, and the linear resistance is 5000 Ω / cm) located inside the insulating weft knitted double-sided fabric at the same time;

[0125] The conductive yarn g and the conductive yarn h do not contact each other;

[0126] One end of the conductive yarn g and the conductive yarn h protrudes from the same side of the insulating weft knitted double-sided fabric and is respectively connected to the positive and negative electrodes of the electrode;

[0127] The conductive yarn g is divided into left and right parts. The left part is knitted between the front coil and the back coil of the insulating weft knitted double-sided fabric in the way of inlay knitting. The right part is a floating yarn. The left part forms the main circuit III, and the right part forms the branch circuit III;

[0128] The conductive yarn h is divided into left and right parts. The right part is knitted between the front coil and the back coil of the insulating weft knitted double-sided fabric in the way of inlay knitting. The left part is a floating yarn. The right part forms the main circuit IV, and the left part forms the branch circuit IV;

[0129] The resistance ratio of the main circuit III to the branch circuit III is 10, and the resistance ratio of the main circuit IV to the branch circuit IV is 10;

[0130] The conductive yarn i is in contact with both the branch circuit III and the branch circuit IV at the same time;

[0131] The conductive yarn i is knitted between the front coil and the back coil of the insulating weft knitted double-sided fabric in the way of inlay knitting.

[0132] The preparation method of the integrally formed multi-layer flexible fabric circuit as described above is as follows: On a computerized flat knitting machine with a gauge of 18 needles, 4 yarn feeders are used for knitting to form an electrothermal fabric. The yarn feeders are YG1, YG2, YG3, and YG4 from left to right. YG1 and YG2 knit rib inlay stitch on the left side of the fabric. YG1 and YG3 knit rib inlay stitch in the middle of the fabric. YG1 and YG4 knit rib inlay stitch on the right side of the fabric. YG2 and YG4 respectively bring the yarn i into the area through floating yarns to connect the electrodes. Among them, YG1 is threaded with insulating yarn, YG2 is threaded with conductive yarn g, YG3 is threaded with conductive yarn i, and YG4 is threaded with conductive yarn h.

[0133] Example 8

[0134] An integrally formed multi-layer flexible fabric circuit is composed of an insulating weft-knitted double-sided fabric (made of insulating yarns, the insulating yarns are flame-retardant polyester with a specification of 100D / 48F), electrodes located on the surface of the insulating weft-knitted double-sided fabric, and a single conductive yarn g (the wire resistance of the conductive yarn g is 0.04Ω / cm, and the wire resistance of the conductive yarn g is 0.04Ω / cm. The conductive yarn g is twisted from 7 copper wires with a diameter of 0.03mm), a single conductive yarn h (the conductive yarn h is a copper wire with a diameter of 0.03mm, twisted from 9 wires, and the wire resistance is 0.04Ω / cmΩ / cm), and a conductive yarn i (the conductive yarn i is a pre-oxidized silk yarn low-temperature carbonized, and the wire resistance is 5000Ω / cm);

[0135] The conductive yarn g and the conductive yarn h do not contact each other;

[0136] One end of the conductive yarn g and the conductive yarn h protrudes from the same side of the insulating weft-knitted double-sided fabric and is respectively connected to the positive and negative electrodes;

[0137] The conductive yarn g is divided into left and right parts. The left part is woven into the front and back coils of the insulating weft-knitted double-sided fabric in the way of inlay knitting, and the right part is a floating yarn. The left part forms the main circuit III, and the right part forms the branch circuit III;

[0138] The conductive yarn h is divided into left and right parts. The right part is woven into the front and back coils of the insulating weft-knitted double-sided fabric in the way of inlay knitting, and the left part is a floating yarn. The right part forms the main circuit IV, and the left part forms the branch circuit IV;

[0139] The resistance ratio of the main circuit III to the branch circuit III is 10, and the resistance ratio of the main circuit IV to the branch circuit IV is 10;

[0140] The conductive yarn i is in contact with both the branch circuit III and the branch circuit IV at the same time;

[0141] The conductive yarn i is woven into the front and back coils of the insulating weft-knitted double-sided fabric in the way of inlay knitting.

[0142] The preparation method of the integrally formed multi-layer flexible fabric circuit as described above is as follows: On a computerized flat knitting machine with a gauge of 18 needles, 4 yarn feeders are used for knitting, and an electrothermal fabric is knitted. The yarn feeders from left to right are YG1, YG2, YG3, and YG4. YG1 and YG2 knit rib inlay knitting on the left side of the fabric, YG1 and YG3 knit rib inlay knitting in the middle of the fabric, YG1 and YG4 knit rib inlay knitting on the right side of the fabric. YG2 and YG4 respectively bring the yarn i area through floating yarns to make the electrodes connected; among them, YG1 passes through the insulating yarn, YG2 passes through the conductive yarn g, YG3 passes through the conductive yarn i, and YG4 passes through the conductive yarn h.

Claims

1. An integrally formed multi-layer flexible fabric circuit, characterized in that, The functional layout classification includes trunk circuit I, branch circuit I, trunk circuit II, and branch circuit II. The trunk circuit I is connected to the branch circuit I, the trunk circuit II is connected to the branch circuit II, the trunk circuit I is not connected to the trunk circuit II, and the branch circuit I is not connected to the branch circuit II; The trunk circuit I and the trunk circuit II form a "匚"-shaped area, and the branch circuit I and the branch circuit II are both located in the area; The resistance ratio of the main circuit I to the branch circuit I is not less than 6, and the resistance ratio of the main circuit II to the branch circuit II is not less than 6; Classification by composition structure includes insulating warp knitted fabric and single conductive yarn a, single conductive yarn b, and multiple conductive yarns X located inside the insulating warp knitted fabric; The conductive yarn a is a weft yarn inserted into the insulating warp knitted fabric from the left side, and the conductive yarn b is a weft yarn inserted into the insulating warp knitted fabric from the right side; The plurality of conductive yarns X include a plurality of conductive yarns c, a plurality of conductive yarns d, and a plurality of conductive yarns e; The plurality of conductive yarns c and the plurality of conductive yarns d respectively correspond to the front section and the rear section arranged along the warp direction after the plurality of conductive yarns Y are cut, and one end of the plurality of conductive yarns c and the plurality of conductive yarns d are exposed from the technical reverse side of the insulating warp knitted fabric; The conductive yarn a is divided into two parts, the left part of the conductive yarn b is divided into a left front part and a left rear part arranged along the warp direction; the conductive yarn a is located at the front side of the left rear part of the conductive yarn b; The main circuit I is composed of the left part of the conductive yarn a and the conductive yarn c in contact with it, the branch circuit I is composed of the right part of the conductive yarn a, the main circuit II is composed of the left rear part of the conductive yarn b, the conductive yarn d in contact with the left rear part, the right part of the conductive yarn b, and the conductive yarn e in contact with the right part, and the branch circuit II is composed of the left front part of the conductive yarn b; Classification by composition structure also includes electrodes located on the surface of the insulating warp knitted fabric, and one end of a plurality of conductive yarns c and a plurality of conductive yarns d exposed from the insulating warp knitted fabric is respectively connected to the positive electrode and the negative electrode of the electrode.

2. The multi-layer flexible fabric circuit formed in one piece according to claim 1, wherein Multiple conductive yarns Y are woven into the loop stem and extension line of the insulating warp knitted fabric in the form of warp lining, weft lining or looping; multiple conductive yarns e are woven into the loop stem and extension line of the insulating warp knitted fabric in the form of warp lining, weft lining or looping.

3. The one-piece multi-layer flexible fabric circuit according to claim 2, characterized in that, All loop-forming methods are selected from chain weaving, plain warp, pile warp and bias warp.

4. The one-piece multi-layer flexible fabric circuit according to claim 1, characterized in that, According to the composition structure, the conductive yarn f is also located inside the insulating warp knitted fabric, and the conductive yarn f is in contact with the branch circuit I and the branch circuit II at the same time; the conductive yarn f is woven between the loop stem and the extension line of the insulating warp knitted fabric in the form of warp lining, weft lining or loop forming; the line resistance of the conductive yarn f is 100-5000Ω / cm, and the line resistance of the conductive yarn a and the conductive yarn b is 0.01-1Ω / cm.

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