Preparation method of low-elasticity synthetic fiber knitted fabric with multifunctional sensing function

Abstract

The invention discloses a preparation method of a multifunctional sensing low-elasticity synthetic fiber knitted fabric, which comprises the following steps: firstly, carrying out continuous conductive treatment on low-elasticity synthetic fibers through synchronous adhesion of in-situ polymerized polypyrrole and waterborne polyurethane, and then directly knitting the conductive synthetic fibers through a knitting machine to realize the development of the multifunctional sensing knitted fabric. The prepared fabric sensor has high-linearity and durable tensile and compressive sensing performance, and can be used for monitoring the environment temperature and humidity, the metal ion concentration in a solution and the like. According to the invention, a reliable technical guarantee can be laid for realizing high-value utilization of low-elasticity synthetic fibers represented by terylene in the flexible multifunctional intelligent wearable field.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of flexible electronics and intelligent sensing, and relates to a preparation method of low-elastic synthetic fiber knitted fabric with multifunctional sensing. BACKGROUND

[0002] In the field of flexible electronics and intelligent sensing, traditional low-elastic synthetic fiber fabric has become an important carrier for building intelligent wearable sensor devices due to its flexibility and high weavability. For example, some researchers prepared a warp-knitted polyester fabric pressure sensor by dipping carbon / copper paste to realize pressure sensing function. However, the sensor can only respond to a single pressure signal, and its durability is limited when the pressure sensing range is less than 80 kPa. Moreover, directly dipping the fabric reduces the air and moisture permeability of the fabric, thereby affecting the wearing comfort. Some researchers focus on the humidity sensing application of elastic fabric, which can realize humidity monitoring but cannot respond to multiple parameters such as mechanics and temperature, thus limiting its application in complex scenarios (Patent No. CN202011271485.X). In addition, synthetic fibers usually have high hydrophobicity and smooth surfaces, and it is difficult to stably attach conductive materials. High-elasticity materials such as polyurethane can realize large-strain sensing, but due to their dense molecular chain structure and strong elastic recovery force, they are prone to breakage and loop shedding during mechanical knitting on a knitting machine, resulting in low knitting efficiency and difficulty in large-scale production (Patent No. CN202410490674.8). Some researchers have developed a stretchable multi-mode sensor by wrapping a layer of carbon nanotube / polyurethane material on the surface of an elastic core yarn, but the pressure detection range of the sensor is less than 50 kPa, and the mechanical weavability and dynamic signal stability are poor (Patent No. CN201811052129.1). In contrast, low-elastic synthetic fibers have lower elastic recovery rate and good yarn bundling, and their knitting performance is significantly better. They can be used to prepare diversified fabric structures through conventional knitting equipment. However, existing low-elastic synthetic fiber sensors still have obvious shortcomings. Most products have sensing functions focused on a single physical quantity, making it difficult to meet the demand for multifunctional collaborative monitoring. Some products have multifunctional characteristics, such as a polyester fabric strain-humidity sensor prepared by using PEDOT:PSS / natural rubber latex ink, which can respond to both stretching and humidity. However, its linearity in the effective strain range is low, and the application of composite ink makes the fabric lose the advantage of high air and moisture permeability, which limits its application in the field of intelligent wearables.

[0003] Therefore, it is necessary to develop a low-elastic synthetic fiber knitted fabric with multifunctional sensing. SUMMARY

[0004] The application aims to provide a preparation method of low-elastic synthetic fiber knitted fabric with multifunctional sensing.

[0005] The technical scheme of the application is: The application provides a preparation method of low-elastic synthetic fiber knitted fabric with multifunctional sensing, which comprises the following steps: (1) continuously conducting electric treatment on low-elastic synthetic fiber by using pyrrole, water-based polyurethane, a dopant and an oxidant to obtain conductive low-elastic synthetic fiber; (2) bonding the conductive low-elastic synthetic fiber by using polyvinyl alcohol to obtain low-elastic synthetic fiber yarn; (3) weaving the low-elastic synthetic fiber yarn into fabric by using a knitting machine; (4) washing the fabric to remove polyvinyl alcohol and unstable conductive layer, drying the fabric, and packaging two ends of the fabric by using aluminum foil paper, so that the low-elastic synthetic fiber knitted fabric with multifunctional sensing is obtained.

[0006] Further, in step (1), the low-elastic synthetic fiber is any one or more of polyester fiber, polyamide fiber, polyolefin fiber and polylactic acid fiber; the dopant is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate; and the oxidant is ferric chloride or ammonium persulfate.

[0007] Further, in step (1), the concentration of the pyrrole is 1.5-2 mol / L, the concentration of the water-based polyurethane is 3-7 wt.%, the concentration of the dopant is 0.2-1 mol / L, and the concentration of the oxidant is 1-2 mol / L.

[0008] Further, in step (1), the moving speed of the low-elastic synthetic fiber is 90-180 m / h.

[0009] Further, in step (2), the concentration of the polyvinyl alcohol is 1-2 wt.%.

[0010] Further, in step (2), the diameter of the low-elastic synthetic fiber yarn ranges from 200 µm to 500 µm.

[0011] Further, in step (3), the needle number of the knitting machine is 10-16, and the fabric organization is any one of weft plain stitch, rib stitch, air layer stitch, full-needle rib stitch and double-reverse stitch.

[0012] Further, in step (3), the width of the fabric is 1.5-3 cm, and the length of the fabric is 3-5 cm.

[0013] Further, in step (4), the washing is specifically washing in a shaking water bath at a temperature of 50-70℃ for 20-40 min, and the drying is specifically drying in an oven at a temperature of 50-60℃.

[0014] The application provides a preparation method of low-elastic synthetic fiber knitted fabric with multifunctional sensing, which has the advantages that: through in-situ polymerization of simultaneous adhesion of polypyrrole and water-based polyurethane, continuous conductive treatment of low-elastic synthetic fiber is realized, the low-elastic synthetic fiber knitted fabric sensor prepared by combining the knitting process of a knitting machine not only maintains the excellent mechanical knitting performance of low-elastic synthetic fiber, but also can accurately respond to mechanical signals such as stretching and compression, and can also synchronously monitor temperature, humidity and metal ion concentration, and has excellent stability and durability, and the comprehensive performance is significantly better than that of the prior art, and a breakthrough is realized in the multifunctional sensing performance, which provides key technical support for high-value application of low-elastic synthetic fiber in the field of flexible multifunctional sensing, and provides an innovative scheme with structural flexibility, wearing comfort and multifunctional sensing for the field of flexible wearable sensors, and will promote the practical application of functional textiles in the field of intelligent monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A physical diagram of the fabric sensor prepared by the preparation method of the low-elastic synthetic fiber knitted fabric with multifunctional sensing; Figure 2 A schematic diagram of a full-needle rib polyester fabric with a yarn diameter of 389 µm and a knitting machine needle number of 14 of the low-elastic synthetic fiber knitted fabric with multifunctional sensing prepared by the preparation method of the low-elastic synthetic fiber knitted fabric with multifunctional sensing, wherein (a) is a physical diagram, and (b) is a structural diagram; Figure 3 A transverse strain sensing performance schematic diagram of the fabric sensor prepared by the preparation method of the low-elastic synthetic fiber knitted fabric with multifunctional sensing, wherein (a) is polyester, a yarn diameter is 389 µm, a structure is full-needle rib structure, and a knitting machine needle number is 14; (b) is nylon, a yarn diameter is 309 µm, a structure is weft plain stitch structure, and a knitting machine needle number is 12; (c) is acrylic, a yarn diameter is 278 µm, a structure is 1+1 rib structure, and a knitting machine needle number is 10; and (d) is polylactic acid, a yarn diameter is 427 µm, a structure is air layer structure, and a knitting machine needle number is 16; Figure 4A schematic diagram of the pressure sensing performance of a fabric sensor prepared by the preparation method of a low-elastic synthetic fiber knitted fabric with multifunctional sensing according to the present application, wherein (a) is polyester, yarn diameter: 389 µm, stitch structure: full needle rib stitch, knitting machine needle number: 14; (b) is nylon, yarn diameter: 309 µm, stitch structure: weft plain stitch, knitting machine needle number: 12; (c) is acrylic, yarn diameter: 278 µm, stitch structure: 1+1 rib stitch, knitting machine needle number: 10; (d) is polylactic acid, yarn diameter: 427 µm, stitch structure: air layer stitch, knitting machine needle number: 16; Figure 5 A schematic diagram of the sensing performance, stability, and durability of a polyester fabric sensor with a yarn diameter of 389 µm, a stitch structure of full needle rib stitch, and a knitting machine needle number of 14 prepared by the preparation method of a low-elastic synthetic fiber knitted fabric with multifunctional sensing according to the present application, wherein (a) is strain sensing performance; (b) is pressure sensing performance; (c) is stability under 1000 cycles of stretching at 50% strain; (d) is stability under 2000 cycles of compression at a pressure of 20 kPa; Figure 6 A schematic diagram of the response of a polyester fabric sensor with a yarn diameter of 389 µm, a stitch structure of full needle rib stitch, and a knitting machine needle number of 14 prepared by the preparation method of a low-elastic synthetic fiber knitted fabric with multifunctional sensing according to the present application to humidity and temperature, wherein (a) is the relative resistance change under different humidity; (b) is the electrical signal under a humidity of 40%-80%; (c) is the relative resistance change under different temperature; (d) is the electrical signal under a temperature of 20-40℃. DETAILED DESCRIPTION

[0016] The present application aims to provide a preparation method of a low-elastic synthetic fiber knitted fabric with multifunctional sensing, which includes a conductive treatment of low-elastic synthetic fibers and a weaving process of a low-elastic synthetic fiber knitted fabric.

[0017] The above method includes the following steps: A low-elastic synthetic fiber is continuously conductively treated by pyrrole (Py), waterborne polyurethane (WPU), a dopant, and an oxidant to obtain a conductive low-elastic synthetic fiber, wherein the low-elastic synthetic fiber includes polyester fibers such as polyester, polyamide fibers such as nylon, polyolefin fibers such as acrylic, polylactic acid fibers, etc., the dopant includes sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS), etc., the oxidant includes ferric chloride (FeCl3), ammonium persulfate (APS), etc., the concentration of Py is 1.5-2 mol / L, the concentration of WPU is 3-7 wt.%, the concentration of the dopant is 0.2-1 mol / L, the concentration of the oxidant is 1-2 mol / L, and the speed of the low-elastic synthetic fiber is 90-180 m / h. The conductive low-elastic synthetic fiber is adhered by polyvinyl alcohol (PVA) to prevent the conductive low-elastic synthetic fiber from being seriously abraded during weaving and to protect the conductive layer, wherein the concentration of the PVA is 1-2 wt.%, and the diameter of the yarn after adhesion ranges from 200 to 500 µm; (3) The low-elastic synthetic fiber yarn after adhesion is woven into a fabric by using a knitting machine, the fabric width is 1.5-3 cm, the length is 3-5 cm, the needle gauge of the knitting machine is 10-16, and the fabric organization is weft plain stitch, rib stitch, air layer stitch, full-needle rib stitch, double-reverse stitch, etc.; (4) The fabric is cleaned in a shaking water bath oven at 50-70 ℃ for 20-40 min to remove the polyvinyl alcohol and the unstable conductive layer, and finally dried in an oven at 50-60 ℃. The two ends of the fabric are packaged by using aluminum foil paper to obtain a low-elastic synthetic fiber knitted fabric with multifunctional sensing.

[0018] Please refer to Figure 1 , Figure 1 It is a physical map of the fabric sensor prepared by the preparation method of the low-elastic synthetic fiber knitted fabric with multifunctional sensing. As shown in Figure 1 To prevent the fabric from being uncoiled and rolled, the rib stitch is used to fix the sensing organization on both sides of the fabric in the loop direction, the knitted fabric sample is in the shape of a rectangle as a whole, the fabric width is 1.5-3 cm, and the length is 3-5 cm, wherein the fixed organization width of the two sides is 0.5 cm. The two ends of the fabric are fixed between two layers of aluminum foil paper as connecting electrodes respectively to make a fabric sensor.

[0019] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions of the present application will be further described below in combination with specific examples. However, the present application is not limited to the listed examples, and any known changes within the scope of the claimed rights of the present application are also included.

[0020] The term "one embodiment" or "an embodiment" as used herein means that a particular feature, structure, or characteristic described can be included in at least one implementation of the present application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a single, alternative embodiment.

[0021] Example 1 The following example shows a preparation method of a low-elastic synthetic fiber knitted fabric with multifunctional sensing, and the specific steps are as follows: A mixed solution with SDS concentration of 0.6 mol / L, aqueous polyurethane concentration of 5 wt.% and pyrrole monomer of 1.75 mol / L and 1.5 mol / L FeCl3 aqueous solution were prepared. The polyester fiber was sequentially passed through the above two solutions at a yarn speed of 180 m / h, and then dried. The above steps were cycled 5 times.

[0022] The conductive polyester fiber yarn was sized with 1 wt.% PVA, and the diameter of the polyester yarn obtained was 389 µm. Then the sized and dried conductive polyester yarn was knitted into a full needle rib fabric with a size of 3.0×5.0 cm 2 by using a hand flat knitting machine with a needle number of 14. 2 The two ends of the fabric were connected with aluminum foil electrodes to form a sensor with a size of 3.0×3.0 cm

[0023] Referring to Figure 2 , Figure 2 the full needle rib polyester fabric with a yarn diameter of 389 µm and a knitting machine needle number of 14 prepared by the preparation method of the low-elastic synthetic fiber knitted fabric with multifunctional sensing according to the present application is shown in the schematic diagram, wherein (a) is a physical diagram and (b) is a structural diagram. As shown in Figure 2 (a), the fabric has good conductive performance, the square resistance is 6.68 kΩ / sq, the fabric thickness is 1.80 mm, and the unfullness coefficient is 3.00. As shown in Figure 2 (b), the conductive polyester yarn in the sensor forms a loop structure and is intertwined to form a stable conductive network.

[0024] The sensor has multifunctional sensing performance, including strain response, pressure response, humidity response, temperature response, etc.

[0025] Referring to Figure 3 , Figure 3 the transverse strain sensing performance schematic diagram of the fabric sensor prepared by the preparation method of the low-elastic synthetic fiber knitted fabric with multifunctional sensing according to the present application is shown. As shown in Figure 3 (a), the ductility of the loop gives the fabric sensor good transverse strain sensing performance, the strain sensing range is 0-120%, the sensitivity in this strain range is 0.14, and the linearity is 0.995.

[0026] Referring to Figure 4 , Figure 4 the pressure sensing performance schematic diagram of the fabric sensor prepared by the preparation method of the low-elastic synthetic fiber knitted fabric with multifunctional sensing according to the present application is shown. As shown in Figure 4As shown in (a), the stacking of coils gives the sensor good pressure sensing performance; the sensor's sensitivity reaches 0.60 kPa under pressures of 0-100 kPa. -1 The linearity is as high as 0.988.

[0027] Please see Figure 5 , Figure 5 This diagram illustrates the sensing performance, stability, and durability of a polyester fabric sensor prepared using the method for preparing a multifunctional sensing low-elastic synthetic fiber knitted fabric according to the present invention. The sensor uses a yarn diameter of 389 µm, a full-needle rib knit structure, and a knitting machine needle gauge of 14. Figure 5 As shown in (a) and (b), the signal from this fabric sensor exhibits high periodic stability under 1000 cycles of 50% stretching and 2000 cycles of 20 kPa compression. Figure 5 As shown in (c) and (d), the sensing performance of the fabric sensor is basically unaffected after 5,000 rubs and 50 washes, demonstrating good durability.

[0028] This fabric sensor can also detect ambient temperature and humidity. Please refer to [link / reference]. Figure 6 , Figure 6 This diagram illustrates the response of a polyester fabric sensor to humidity and temperature, prepared using a yarn diameter of 389 µm, a full-needle rib knit structure, and a 14-gauge knitting machine, according to the method for preparing a multifunctional sensing low-elastic synthetic fiber knitted fabric as described in this invention. Figure 6 As shown in (a) and (b), the relative resistance change of this fabric sensor is proportional to the ambient relative humidity, with a humidity response range of 35%-90%, and it exhibits a stable electrical signal during relative humidity changes of 40%-80%. Furthermore, as... Figure 6 As shown in (c) and (d), the relative resistance change of the fabric sensor is inversely proportional to the ambient temperature, and its temperature response range is 0-100℃. It can also present a stable electrical signal during temperature changes from 20-40℃.

[0029] Example 2 The following embodiments illustrate a method for preparing a low-elasticity synthetic fiber knitted fabric with multifunctional sensing capabilities. The specific steps are as follows: A mixed solution of SDBS (1 mol / L), aqueous polyurethane (3 wt.%), and pyrrole monomer (1.5 mol / L) and an APS aqueous solution (1 mol / L) were prepared. Nylon fibers were sequentially passed through both solutions at a yarn speed of 150 m / h, followed by drying. This process was repeated five times.

[0030] The conductive nylon yarns were then knitted into a fabric with size width x length of 1.5 x 3.0 cm by using a hand flat knitting machine with 12 needles. 2 The conductive nylon yarns were then knitted into a fabric with size width x length of 1.5 x 3.0 cm by using a hand flat knitting machine with 12 needles. 2 The fabric has good conductivity with sheet resistance of 8.45 kQ / sq, fabric thickness of 1.01 mm, and fullness factor of 5.66. The conductive nylon yarns in the sensor form single loop structures and interlace with each other to form a stable conductive network.

[0031] The sensor has multi-functional sensing performance, including strain response, pressure response, humidity response, temperature response, etc.

[0032] Please continue to refer to Figure 3 , as shown in Figure 3 (b), the extensibility of the loops endows the fabric sensor with good transverse strain sensing performance, with a strain sensing range of 0-60% and a sensitivity of 0.25 and a linearity of 0.979 within this strain range.

[0033] Please continue to refer to Figure 4 , as shown in Figure 4 (b), the stacking of the loops endows the sensor with good pressure sensing performance, with a sensitivity of 0.21 kPa -1 and a linearity of 0.963 within a pressure range of 0-100 kPa. The fabric sensor has strain and pressure response capabilities and can also respond to environmental temperature and humidity, with excellent stability and durability of the response signal.

[0034] Example 3 The following example demonstrates a method for preparing a low-elastic synthetic fiber knitted fabric with multi-functional sensing, with the specific steps as follows: A mixed solution with SDS concentration of 0.2 mol / L, aqueous polyurethane concentration of 7 wt.%, and pyrrole monomer of 2 mol / L, and a 2 mol / L aqueous FeCl3 solution were prepared. The acrylic fibers were sequentially passed through the two solutions at a yarn speed of 120 m / h, and then dried. The same steps were repeated for 5 cycles.

[0035] The conductive acrylic yarns were then knitted into a fabric with size width x length of 2.5 x 4.0 cm by using a hand flat knitting machine with 10 needles. 21+1 rib fabric, and the fabric was connected to aluminum foil electrodes at both ends to make a sensor with a size of 2.5 x 2.0 cm 2 The fabric has good electrical conductivity, with a square resistance of 7.31 kΩ / sq, a fabric thickness of 1.54 mm, and a non-compactness of 8.25. The conductive acrylic yarn in the sensor forms an overlapping coil structure and is intertwined with each other to form a stable conductive network.

[0036] The sensor has multifunctional sensing performance, including strain response, pressure response, humidity response, temperature response, etc.

[0037] Please continue to refer to Figure 3 , as shown in Figure 3 (c), the ductility of the coil gives the fabric sensor good transverse strain sensing performance, with a strain sensing range of 0-120%, a sensitivity of 0.04 in this strain range, and a linearity of 0.933.

[0038] Please continue to refer to Figure 4 , as shown in Figure 4 (c), the stacking of the coil gives the sensor good pressure sensing performance, with a sensitivity of 0.50 kPa -1 under 0-100 kPa pressure, and a linearity of up to 0.982. The fabric sensor has strain and pressure response capabilities, and can also respond to environmental temperature and humidity, with excellent stability and durability of the response signal.

[0039] Example 4 A mixed solution with a SDS concentration of 1 mol / L, an aqueous polyurethane concentration of 5 wt.%, and a pyrrole monomer of 1.5 mol / L, and a 1 mol / L aqueous FeCl3 solution were prepared, and the polylactic acid fiber was sequentially passed through the two solutions at a yarn speed of 90 m / h, and then dried. The same steps were repeated 5 times.

[0040] The conductive polylactic acid fiber yarn was sized with 1 wt.% PVA, and the obtained polylactic acid yarn had a diameter of 427 µm. Then, the sized and dried conductive polylactic acid yarn was woven into a size of 2.0 x 5.0 cm 2 air layer fabric, and the fabric was connected to aluminum foil electrodes at both ends to make a sensor with a size of 2.0 x 3.0 cm 2 The fabric has good electrical conductivity, with a square resistance of 5.58 kΩ / sq, a fabric thickness of 1.93 mm, and a non-compactness of 2.52. The conductive polylactic acid yarn in the sensor forms a coil structure and is intertwined with each other to form a stable double-sided hollow conductive network.

[0041] This sensor has multifunctional sensing capabilities, including strain response, pressure response, humidity response, and temperature response.

[0042] Please continue reading. Figure 3 ,like Figure 3 As shown in (d), the extensibility of the coil gives the fabric sensor good lateral strain sensing performance, with a strain sensing range of 0-120%, and a sensitivity of 0.10 and a linearity of 0.992 within this strain range.

[0043] Please continue reading. Figure 4 ,like Figure 4 As shown in (d), the stacking of coils gives the sensor good pressure sensing performance; the sensor's sensitivity reaches 0.43 kPa under pressures of 0-100 kPa. -1 The linearity is as high as 0.969. In addition to its strain and pressure response capabilities, this fabric sensor can also respond to environmental temperature and humidity, and the response signal has excellent stability and durability.

[0044] In summary, the method for preparing a multifunctional sensing low-elastic synthetic fiber knitted fabric described in this invention produces a fabric sensor with high linearity and durability in tensile and compression sensing performance. Furthermore, it can monitor ambient temperature, humidity, and the concentration of metal ions in a solution. This preparation method provides a reliable technical guarantee for the high-value utilization of low-elastic synthetic fibers, represented by polyester, in the field of flexible, multifunctional, and intelligent wearable devices.

[0045] 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 it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for producing a low-stretch synthetic fiber knitted fabric having multifunctional sensing, characterized by, The method comprises the following steps: (1) continuously conducting a conductive treatment on low-elastic synthetic fibers by using pyrrole, aqueous polyurethane, a dopant and an oxidant, to obtain conductive low-elastic synthetic fibers; (2) bonding the conductive low-elastic synthetic fibers by using polyvinyl alcohol, to obtain low-elastic synthetic fiber yarns; (3) weaving a fabric by using a knitting machine; (4) washing the fabric to remove polyvinyl alcohol and an unstable conductive layer, drying the fabric, and packaging both ends of the fabric by using aluminum foil paper, to obtain a low-elastic synthetic fiber knitted fabric with multifunctional sensing.

2. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1, wherein: In step (1), the low-elastic synthetic fibers are any one or more of polyester fibers, polyamide fibers, polyolefin fibers and polylactic acid fibers; the dopant is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate; and the oxidant is ferric chloride or ammonium persulfate.

3. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1 wherein: In step (1), the concentration of the pyrrole is 1.5-2 mol / L, the concentration of the aqueous polyurethane is 3-7 wt.%, the concentration of the dopant is 0.2-1 mol / L, and the concentration of the oxidant is 1-2 mol / L.

4. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1 wherein: In step (1), the moving speed of the low-elastic synthetic fibers is 90-180 m / h.

5. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1 wherein: In step (2), the concentration of the polyvinyl alcohol is 1-2 wt.%.

6. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1 wherein: In step (2), the diameter of the low-elastic synthetic fiber yarns ranges from 200 to 500 µm.

7. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1 wherein: In step (3), the needle gauge of the knitting machine is 10-16, and the stitch of the fabric is any one of weft plain stitch, rib stitch, air layer stitch, full-needle rib stitch and double-reverse stitch.

8. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1 wherein: In step (3), the width of the fabric is 1.5-3 cm, and the length is 3-5 cm.

9. A process for the production of low stretch synthetic fibre knitted fabric with multi-functional sensing as claimed in claim 1 wherein: In step (4), the washing is specifically performed in a shaking water bath at a temperature of 50-70 ℃ for 20-40 min, and the drying is specifically performed in an oven at a temperature of 50-60 ℃.

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