A multi-layer folded-weft formed capacitive sensor and method of manufacturing the same

Abstract

The application provides a multi-layer folded and cross-knitted formed capacitive sensor, which comprises a first spacer fabric, a connecting layer knitted on the upper surface of the first spacer fabric, an upper cross stripe organization arranged above the first spacer fabric and connected with the connecting layer to form a second conductive layer, the first spacer fabric comprising a lower cross stripe organization for forming a first conductive layer, an upper surface layer arranged above the lower cross stripe organization, and a spacer yarn arranged between the lower cross stripe organization and the upper surface layer for connecting the upper and lower coil layers, so that the application can prepare a full-textile sensor with multiple sensing units and high sensitivity through an integrated textile process, the full-textile sensor has a larger pressure response range, and the preparation can be completed without the need of cutting and restacking the multi-layer fabric after the machine, the material consumption is low, and the preparation process is simple.

Description

Technical Field

[0001] The present invention belongs to the field of knitting technology, and in particular relates to a capacitive sensor and a manufacturing method thereof. Background Art

[0002] Flexible capacitive sensors often use flexible materials such as polymers, nanomaterials, and fabrics as sensitive elements and substrates. These sensors have excellent flexibility, ductility, and the ability to bend and even fold freely, making them adaptable to measurement environments of various complex shapes. Their sensing principles can be roughly divided into three types: variable-pole-gap, variable-dielectric-constant, and variable-area. Variable-pole-gap capacitive sensors are the most commonly used sensing principle, offering advantages such as simple structure, strong environmental adaptability, and excellent repeatability. However, they are currently mostly manufactured through multiple steps, with various layers then composited onto a substrate for post-processing. This method uses a variety of complex raw materials, a complex and tedious production process, and high costs, making it difficult to achieve industrial production and practical application.

[0003] In related technologies, even when developing sensors using textile fabrics as sensor substrates, there are still many structural and preparation process defects: the number of sensor arrays formed between the fabric electrodes is small and the sensitivity is poor. The preparation process of the conductive electrodes requires repeated loading and unloading of the machine, or the need to subsequently composite multiple layers of fabric, etc., which will cause the preparation process to be cumbersome and difficult, and the sensing effect is poor.

[0004] Therefore, in summary, it is necessary to develop a capacitive sensor with simple preparation process and better sensing sensitivity to solve such problems. Summary of the Invention

[0005] The present invention provides a multi-layer folded flat-knitted capacitive sensor, comprising a first spacer fabric, a connecting layer woven on the upper surface of the first spacer fabric, an upper horizontal stripe fabric arranged above the first spacer fabric and connected to the connecting layer to form a second conductive layer, the first spacer fabric comprising a lower horizontal stripe fabric for forming the first conductive layer, an upper surface layer arranged above the lower horizontal stripe fabric, and a spacer wire arranged between the lower horizontal stripe fabric and the upper surface layer for connecting the upper and lower layers of coils, so that: the present invention prepares a fully textile sensor with multiple sensing units and high sensitivity through an integrated textile process, which has a larger pressure response range and can be completed without cutting and stacking multiple layers of fabric after leaving the machine, consuming less material and having a simple preparation process.

[0006] Therefore, the first object of the present invention is to overcome the shortcomings of the prior art and provide a multi-layer folded flat-knitted capacitive sensor: a multi-layer folded flat-knitted capacitive sensor, characterized in that it includes a first spacer fabric, a connecting layer woven on the upper surface of the first spacer fabric, an upper horizontal stripe structure arranged above the first spacer fabric and connected to the connecting layer to form a second conductive layer; the first spacer fabric includes a lower horizontal stripe structure for forming the first conductive layer, an upper surface layer arranged above the lower horizontal stripe structure, and a spacer wire arranged between the lower horizontal stripe structure and the upper surface layer for connecting the upper and lower layers of coils.

[0007] A further preferred technical solution is that the upper horizontal stripe structure is formed by alternately weaving conductive yarns and non-conductive yarns to form multiple first electrodes, and the lower horizontal stripe structure is formed by alternately weaving conductive yarns and non-conductive yarns to form multiple second electrodes, and the first electrodes and the second electrodes are orthogonal to each other on the vertical projection plane.

[0008] A further preferred technical solution is that: it further includes a second spacer fabric provided between the first spacer fabric and the upper horizontal stripe tissue and connected to the first spacer fabric via the connecting layer.

[0009] A further preferred technical solution is that the second spacer fabric is woven from non-conductive yarns.

[0010] A further preferred technical solution is that there are multiple second spacer fabrics.

[0011] The second aspect of the present invention is to provide a method for preparing the multi-layer folded flat-knitted capacitive sensor described above:

[0012] S11: Using conductive yarn and non-conductive yarn to alternately weave a horizontal stripe structure of intermediate colors on the rear needle bed to form a first conductive layer, using non-conductive yarn to weave the upper surface layer on the front needle bed, using non-conductive monofilament as a spacer yarn to connect the first conductive layer and the upper surface layer by tucking between the two needle beds, repeating the above operation to complete the weaving of a first spacer fabric of a certain size;

[0013] S12: knitting a certain number of rows of single-sided fabric using non-conductive yarn on the upper surface of the first spacer fabric as a connecting layer;

[0014] S13: Use conductive yarn and non-conductive yarn to re-knit the intermediate color horizontal stripe structure on the empty needles of the front needle bed to form a second conductive layer. After knitting a certain number of rows, the whole needle is turned over. After shifting one stitch length horizontally, the needle is turned over again to complete the connection between the longitudinal row coils of the second conductive layer and the horizontal column coils of the connecting layer, so as to realize the preparation of a multi-layer folded flat-knitted capacitive sensor.

[0015] A further preferred technical solution is that in the step S11 and the step S13, the conductive yarn is woven into the first conductive layer and the second conductive layer in a plating manner.

[0016] The third aspect of the present invention is to provide a method for preparing another multi-layer folded flat-knitted capacitive sensor as described above:

[0017] S21: Using conductive yarn and non-conductive yarn to alternately knit an intermediate color stripe structure on the rear needle bed to form a first conductive layer, using non-conductive yarn to knit an upper surface layer on the front needle bed, using non-conductive monofilament as a spacer yarn to connect the first conductive layer and the upper surface layer by tucking between the two needle beds, repeating the above operation to complete the knitting of a first spacer fabric of a certain size;

[0018] S22: knitting a certain number of rows of single-sided fabric using non-conductive yarn on the upper surface of the first spacer fabric as a connecting layer;

[0019] S23: Weaving a second spacer fabric using non-conductive yarn, connecting the lower surface of the second spacer fabric to the first spacer fabric via a connecting layer, and weaving a connecting layer again on the upper surface of the second spacer fabric for connecting to the second conductive layer;

[0020] S24: Use conductive yarn and non-conductive yarn to re-knit the intermediate color horizontal stripe structure on the empty needle of the front needle bed to form a second conductive layer, knit a certain number of rows, and then turn the needle over as a whole. Move the needle horizontally for one stitch and then turn the needle over again to complete the connection between the vertical row coils of the second conductive layer and the horizontal row coils of the connecting layer on the upper surface of the second spacer fabric, so as to realize the preparation of a multi-layer folded flat-knitted capacitive sensor.

[0021] A further preferred technical solution is that in the step S21 and the step S23, the conductive yarn is woven into the first conductive layer and the second conductive layer in a plating manner.

[0022] The beneficial effects of the present invention are at least:

[0023] A fully textile sensor with a sensing array of a certain scale is provided, which utilizes the multi-layer structure of the spacer fabric to realize the integrated weaving of the first conductive layer and the dielectric layer, and then completes the connection between the second conductive layer and the first conductive layer by moving the other horizontal strip of fabric horizontally through the needle, and forms a cross-type electrode that is staggered horizontally and vertically by flipping, and a plurality of sensing units are formed between the two electrode layers, which effectively improves the spatial resolution and can more sensitively measure the exact position of the pressure; furthermore, a folded horizontally woven capacitive sensor with a plurality of dielectric layer structures is provided, which increases the compressible thickness of the fabric, has a larger pressure response range, and is suitable for a variety of application scenarios; at the same time, the application also provides a preparation method for the above two sensors, which introduces a thinner single-sided fabric as a folding connecting layer between different spacer fabrics to facilitate folding the multi-layer fabric after it is unloaded from the machine, greatly reducing the previous cutting waste in the fabric operation after it is unloaded from the machine, improving the preparation efficiency, and reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 It is the sensing principle diagram of the present invention;

[0026] Figure 2 This is a fabric effect diagram of the present invention;

[0027] Figure 3 It is a schematic diagram of the specifications of the present invention;

[0028] Figure 4 It is a process schematic diagram of the present invention;

[0029] Figure 5 It is a schematic diagram of the fabric weaving of the present invention. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0031] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively. They are relative concepts and may therefore change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0032] Example 1

[0033] As attached Figures 1 to 5 As shown, a multi-layer folded flat-knitted capacitive sensor includes a first spacer fabric, a connecting layer woven on the upper surface of the first spacer fabric, an upper horizontal stripe fabric arranged above the first spacer fabric and connected to the connecting layer to form a second conductive layer; the first spacer fabric includes a lower horizontal stripe fabric for forming the first conductive layer, an upper surface layer arranged above the lower horizontal stripe fabric, and a spacer wire arranged between the lower horizontal stripe fabric and the upper surface layer for connecting the upper and lower layers of coils.

[0034] In this embodiment, the multi-layer folded horizontally woven capacitive sensor mainly includes three modules, which are composed of a first conductive layer, a dielectric layer and a second conductive layer. The change in capacitance is achieved by changing the distance between the two electrode layers of the first conductive layer / the second conductive layer when an external force is applied, thereby achieving the effect of measuring the surface pressure of the fabric; wherein, the lower surface layer of the first spacer fabric, that is, the lower horizontal stripe tissue serves as the first conductive layer, the upper surface layer of the first spacer fabric, the spacer wire and the connecting layer together form a dielectric layer, and the upper horizontal stripe tissue serves as the second conductive layer. The connecting layer can act as a crease to facilitate folding after it is subsequently unloaded from the machine, and the stacking of the multi-layer sensor is quickly completed without the need for reconnection.

[0035] As a preferred embodiment of this invention, the upper horizontal stripe structure is formed by alternately weaving conductive yarns and non-conductive yarns to form a plurality of first electrodes, and the lower horizontal stripe structure is formed by alternately weaving conductive yarns and non-conductive yarns to form a plurality of second electrodes, and the first electrodes and the second electrodes are orthogonal to each other on the vertical projection plane.

[0036] In this embodiment, the non-conductive yarn (hereinafter referred to as a) is selected from one or more low-elastic polyester multifilament, nylon multifilament, etc., and the conductive yarn (hereinafter referred to as b) is one or more copper wire, silver-plated nylon yarn or yarn coated with other conductive materials. The raw material specifications are all one or more combined, and the denier is preferably 600D. The raw materials of the spacer yarn, the upper surface layer, and the connecting layer are preferably polyester monofilament with a diameter of 0.16 mm (hereinafter referred to as c), and the tissue structure is preferably a single-sided plain needle; further, the upper horizontal stripe tissue is a single-sided plain needle interlaced horizontal stripe tissue, and the non-conductive substrate and the first electrode of the first conductive layer are formed by alternately weaving two yarn guides respectively provided with conductive yarn and non-conductive yarn. Similarly, the lower horizontal stripe tissue is prepared using the same raw materials and tissues to form the non-conductive substrate and the second electrode of the second conductive layer. The upper horizontal stripe tissue is rotated 90 degrees by turning the needle, shifting horizontally, and turning the needle again, and the first conductive layer and the second conductive layer are connected to each other through the connecting layer. At this time, the first electrode and the second electrode are arranged to be a cross array that crosses horizontally and vertically, preferably in an orthogonal state, which effectively improves the electrical performance of the sensor.

[0037] In this embodiment, the specific process of the multi-layer folded flat-knitted capacitive sensor is as follows:

[0038] Assuming that the longitudinal density of the fabric is E / cm and the transverse density is G / cm, the longitudinal density is larger than the transverse density, and n = or ≠ m, in actual situations, the process conversion can be carried out in combination with the size:

[0039] The corresponding number of needles in the width direction is N=x*G;

[0040] The number of rows corresponding to a non-conductive horizontal strip in the height direction is h1 = n*E;

[0041] The number of rows corresponding to a conductive horizontal strip in the height direction is h2 = m*E;

[0042] The number of rows corresponding to the connection layer in the height direction h3 = t*E;

[0043] The number of rows corresponding to the upper horizontal stripe structure / lower horizontal stripe structure in the height direction is H=11h1+10h2;

[0044] Combine Figure 3 Calculate the weaving process of the second conductive layer:

[0045] The number of traverses is equal to the number of needles N in the width;

[0046] The number of knitting rows after each transverse transfer is h4=H / N;

[0047] A capacitive sensor is developed based on the first spacer fabric. The lower surface layer of the first spacer fabric, i.e., the lower horizontal stripe structure, is the first conductive layer. The spacer layer and the upper surface layer of the first spacer fabric are dielectric layers. Yarn a is always woven into the upper surface layer, spacer yarn c is woven into the spacer layer, and yarns a and b take turns weaving layer A. Specifically, yarn a is woven into h1 rows of single-sided plain stitches on the front and rear needle beds, and then yarns a and b are woven into h2 rows of single-sided weft plain stitches on the front and rear needle beds, respectively. During this period, spacer yarn c connects the two surface layers between the two needle beds in a tuck manner to complete a cycle of weaving. The cycle is repeated 10 times to complete the preparation of the first spacer fabric. Finally, the loops on the rear needle bed are turned over to the front needle bed, and yarn a is used to weave h3 rows of single-sided weft plain stitches on the front needle bed to complete the weaving of the connecting layer. The above-mentioned completed knitted fabric is not unloaded and waits for connection with the second conductive layer. Specifically, the empty needle N+1-2N on the front needle bed closest to the fabric is selected for re-knitting. First, yarn A is started for knitting. In this process, it is possible that one yarn is always used to complete one h4 row of knitting, or it is possible that two yarns are used, which is determined by the number of rows of each horizontal stripe. Then all the loops N+1-2N are turned over to the back needle bed, and the whole is moved horizontally to the left by one stitch length, and then all the loops are turned back to the front needle bed. At this time, the N knitting needle has two overlapping loops, and the 2N needle is an empty needle, completing one h4 row. Repeat the above steps for connecting the coils. During this period, N needles are always turned and moved horizontally as a whole, the coils in the first longitudinal row are overlapped and connected with the coils in the connecting layer, and the second conductive layer is gradually rotated toward the connecting layer. Repeat the above steps until all the coils in the first longitudinal row of the second conductive layer are connected with all the coils in the horizontal row of the connecting layer, and the second conductive layer completes a 90-degree counterclockwise rotation. After removing from the machine, the second conductive layer is folded along the connecting layer and orthogonally covered on the surface of the dielectric layer to form a cross-shaped row. Finally, a sensor with a single-layer spacer fabric can be obtained.

[0048] This embodiment also relates to a method for manufacturing the multi-layer folded flat-knitted capacitive sensor:

[0049] S11: Using conductive yarn and non-conductive yarn to alternately weave a horizontal stripe structure of intermediate colors on the rear needle bed to form a first conductive layer, using non-conductive yarn to weave the upper surface layer on the front needle bed, and using non-conductive yarn as a spacer yarn to connect the first conductive layer and the upper surface layer by tucking between the two needle beds. Repeat the above operation to complete the weaving of a first spacer fabric of a certain size;

[0050] S12: knitting a certain number of rows of single-sided fabric using non-conductive yarn on the upper surface of the first spacer fabric as a connecting layer;

[0051] S13: Use conductive yarn and non-conductive yarn to re-knit the intermediate color horizontal stripe structure on the empty needles of the front needle bed to form a second conductive layer. After knitting a certain number of rows, the whole needle is turned over. After shifting one stitch length horizontally, the needle is turned over again to complete the connection between the longitudinal row coils of the second conductive layer and the horizontal column coils of the connecting layer, so as to realize the preparation of a multi-layer folded flat-knitted capacitive sensor.

[0052] Compared with the existing technology, the technical solution described in this application has the following advantages: the preparation of the full-fabric capacitive sensor is completed through an integrated weaving process, and there is no need to connect and compound the fabric after it is taken off the machine. The process is simple and reliable, and a sensor array with multiple cross-sensing units is formed, which effectively improves the spatial resolution and has a more sensitive response effect.

[0053] Example 2

[0054] Based on the first embodiment, this embodiment adds a second spacer fabric as a part of the dielectric layer to increase the thickness and expand the application range.

[0055] It also includes a second spacer fabric that is arranged between the first spacer fabric and the upper horizontal stripe tissue and connected through the connecting layer; the second spacer fabric is woven by non-conductive yarn; and there are multiple second spacer fabrics.

[0056] In this embodiment, after completing the weaving of a single first spacer fabric in Example 1, yarn a is used alone to weave the upper and lower surface layers of the second spacer fabric, and yarn c is used as a spacer wire to connect the upper and lower surface layers of the second spacer fabric. At least one second spacer fabric is used as part of the dielectric layer, and is connected to the first spacer fabric and the upper horizontal stripe tissue (i.e., the second conductive layer) through the connecting layer. After leaving the machine, each second spacer fabric is folded along the connecting layer in turn, and the second conductive layer is orthogonally covered on the outermost layer, completing the weaving of the sensor with multiple layers of folded spacer fabric as the dielectric layer.

[0057] This embodiment also relates to a method for manufacturing the multi-layer folded flat-knitted capacitive sensor:

[0058] S21: Using conductive yarn and non-conductive yarn to alternately knit an intermediate color horizontal stripe structure on the rear needle bed to form a first conductive layer, using non-conductive yarn to knit an upper surface layer on the front needle bed, and using non-conductive yarn as a spacer yarn to connect the first conductive layer and the upper surface layer by tucking between the two needle beds. Repeat the above operation to complete the knitting of a first spacer fabric of a certain size;

[0059] S22: knitting a certain number of rows of single-sided fabric using non-conductive yarn on the upper surface of the first spacer fabric as a connecting layer;

[0060] S23: Weaving a second spacer fabric using non-conductive yarn, connecting the lower surface of the second spacer fabric to the first spacer fabric via a connecting layer, and weaving a connecting layer again on the upper surface of the second spacer fabric for connecting to the second conductive layer;

[0061] S24: Use conductive yarn and non-conductive yarn to re-knit the intermediate color horizontal stripe structure on the empty needle of the front needle bed to form a second conductive layer, knit a certain number of rows, and then turn the needle over as a whole. Move the needle horizontally for one stitch and then turn the needle over again to complete the connection between the vertical row coils of the second conductive layer and the horizontal row coils of the connecting layer on the upper surface of the second spacer fabric, so as to realize the preparation of a multi-layer folded flat-knitted capacitive sensor.

[0062] Compared with the existing technology, the technical solution described in this application has the following advantages: the introduction of the second spacer fabric as part of the dielectric layer effectively expands the compressible thickness of the sensor, thereby having a larger pressure response range. In actual situations, it can be selected and designed according to the application product.

[0063] Example 3

[0064] Based on the same inventive concept, the embodiments of the present application also provide optimization of the preparation methods in the above-mentioned embodiments 1 and 2.

[0065] In the step S11 and the step S13, the conductive yarn is woven into the first conductive layer and the second conductive layer by adding yarn; in the step S21 and the step S23, the conductive yarn is woven into the first conductive layer and the second conductive layer by adding yarn.

[0066] During the preparation of the first and second conductive layers, two yarn guides, each using a conductive yarn and a non-conductive yarn, are used to alternately weave the conductive yarn into the conductive layer. During weaving, two different yarns are fed to the hooks of the knitting needles from two yarn feed ports staggered in position, one leading and the other trailing. In the lower horizontal stripe (i.e., the first conductive layer), a is the surface yarn, and b is the ground yarn, serving as the inner layer. B acts as a barrier to protect a and mitigate wear during use. Similarly, in the upper horizontal stripe (i.e., the second conductive layer), a is the ground yarn and b is the surface yarn, achieving the effect of the second conductive layer covering the dielectric layer.

[0067] Compared with the existing technology, the technical solution described in this application has the advantage that the sensing part of the sensor prepared therein can be effectively protected by the fabric of the non-sensing part, which not only ensures the sensing performance but also extends the service life.

[0068] The solution to the problem provided by the optimization of the preparation method is similar to the solution described in the above preparation method, so the specific limitations provided can be found in the above limitations and will not be repeated here.

[0069] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the present invention.

Claims

1. A multi-layer folded flat-knitted capacitive sensor, characterized in that: The invention comprises a first spacer fabric, a connecting layer woven on the upper surface of the first spacer fabric, an upper horizontal stripe structure arranged above the first spacer fabric and connected to the connecting layer to form a second conductive layer; the first spacer fabric comprises a lower horizontal stripe structure for forming the first conductive layer, an upper surface layer arranged above the lower horizontal stripe structure, and spacer wires arranged between the lower horizontal stripe structure and the upper surface layer for connecting the upper and lower layers of coils; The upper horizontal stripe structure is formed by alternately weaving conductive yarns and non-conductive yarns to form a plurality of first electrodes, and the lower horizontal stripe structure is formed by alternately weaving conductive yarns and non-conductive yarns to form a plurality of second electrodes, and the first electrodes and the second electrodes are orthogonal to each other on a vertical projection plane; The method for manufacturing the multi-layer folded flat-knitted capacitive sensor comprises the following steps: S11: Using conductive yarn and non-conductive yarn to alternately weave a horizontal stripe structure of intermediate colors on the rear needle bed to form a first conductive layer, using non-conductive yarn to weave the upper surface layer on the front needle bed, using non-conductive monofilament as a spacer yarn to connect the first conductive layer and the upper surface layer by tucking between the two needle beds, repeating the above operation to complete the weaving of a first spacer fabric of a certain size; S12: knitting a certain number of rows of single-sided fabric using non-conductive yarn on the upper surface of the first spacer fabric as a connecting layer; S13: Use conductive yarn and non-conductive yarn to re-knit the intermediate color horizontal stripe structure on the empty needles of the front needle bed to form a second conductive layer. After knitting a certain number of rows, the whole needle is turned over. After shifting one stitch length horizontally, the needle is turned over again to complete the connection between the longitudinal row coils of the second conductive layer and the horizontal column coils of the connecting layer, so as to realize the preparation of a multi-layer folded flat-knitted capacitive sensor.

2. The multi-layer folded flat-knitted capacitive sensor according to claim 1, characterized in that: The invention also includes a second spacer fabric which is arranged between the first spacer fabric and the upper horizontal stripe and connected to the first spacer fabric by the connection layer.

3. The multi-layer folded flat-knitted capacitive sensor according to claim 2, characterized in that: The second spacer fabric is woven from non-conductive yarns.

4. The multi-layer folded flat-knitted capacitive sensor according to claim 2, characterized in that: The number of the second spacer fabrics is plural.

5. The multi-layer folded flat-knitted capacitive sensor according to claim 1, characterized in that: In the manufacturing method, step S12 further includes the steps of: weaving a second spacer fabric using non-conductive yarn, connecting the lower surface of the second spacer fabric to the first spacer fabric via a connecting layer, and weaving a connecting layer again on the upper surface of the second spacer fabric for connecting to the second conductive layer.

6. The multi-layer folded flat-knitted capacitive sensor according to claim 1, characterized in that: In the S11 and S13, the conductive yarn is woven into the first conductive layer and the second conductive layer in a plating manner.

7. The multi-layer folded flat-knitted capacitive sensor according to claim 1, characterized in that: In the S11, the conductive yarn is woven into the first conductive layer and the second conductive layer in a plating manner.

8. The multi-layer folded flat-knitted capacitive sensor according to claim 5, characterized in that: In the step S12: the non-conductive yarn is woven into the first conductive layer and the second conductive layer in a plating manner.

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