CN116766734A - Manufacturing process of flexible high-sensitivity touch sensor - Google Patents
Manufacturing process of flexible high-sensitivity touch sensor Download PDFInfo
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Abstract
The invention provides a manufacturing process of a flexible high-sensitivity touch sensor, relates to the technical field of sensors, and solves the technical problems of complex process and high cost manufacturing process of the high-sensitivity sensor in the prior art. The device comprises the following operation steps: step S1: spreading two conductive fiber fabric layers on a workbench, and uniformly coating a conductive adhesive on the surfaces of the conductive fiber fabric layers; step S2: respectively flatly attaching the two coated conductive fiber fabric layers on the front and back sides of the middle skin layer to prepare a sensor semi-finished product; step S3: and drying, solidifying, trimming and insulating edge sealing the semi-finished product of the sensor to prepare the flexible high-sensitivity touch sensor.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a manufacturing process of a flexible high-sensitivity touch sensor.
Background
The rapid development of intelligent robots has attracted attention in the world and has played an increasingly important role in the fields of medical devices, sports, industrial equipment, and the like. The intelligent robot directly acts with the external environment during working, so that the physical characteristics of the external environment are perceived and judged, and the robot is required to process the touch information. The realization of visual touch is very important for the intellectualization of the robot. To accommodate such demands, students worldwide place sufficient attention to tactile studies.
In man-machine interaction, in order to ensure safety, the tactile sensor is required to have softness similar to human skin and to be able to adapt to characteristics of different external environments.
However, the current external tactile sensor mainly has three defects: first, high sensitivity sensors often accompany complex and costly manufacturing processes, introducing more uncertainty in the manufacturing process, thereby limiting large area popularization and application; secondly, the micro pressure sensor is difficult to have a large detection range, and the sensor fails under large tactile pressure, so that the application scene of the sensor is limited; thirdly, the sensor is complex in structure, high in requirements on the use environment and easy to damage.
Disclosure of Invention
The invention aims to provide a manufacturing process of a flexible high-sensitivity touch sensor, which aims to solve the technical problems of complex process and high cost manufacturing process of the high-sensitivity sensor in the prior art. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a manufacturing process of a flexible high-sensitivity touch sensor, which comprises the following operation steps:
step S1: spreading two conductive fiber fabric layers on a workbench, and uniformly coating a conductive adhesive on the surfaces of the conductive fiber fabric layers;
step S2: respectively flatly attaching the two coated conductive fiber fabric layers on the front and back sides of the middle skin layer to prepare a sensor semi-finished product;
step S3: and drying, solidifying, trimming and insulating edge sealing the semi-finished product of the sensor to prepare the flexible high-sensitivity touch sensor.
Optionally, the manufacturing process of the conductive fiber fabric layer in step S1 is as follows:
step S11: electroplating copper and nickel on the polyester filaments by adopting an electrophoresis technology to form conductive fibers;
step S12: the conductive fibers and the common fibers are mixed and woven in proportion to prepare a semi-finished product of the conductive fiber fabric;
step S13: and carrying out surface oxidation treatment on the semi-finished product of the conductive fiber fabric to form a conductive fiber fabric layer.
Optionally, the manufacturing process of the conductive adhesive in step S1 is as follows:
and mixing the conductive paste and the resin adhesive in proportion to prepare the conductive adhesive.
Optionally, the manufacturing process of the intermediate skin layer in step S2 is as follows:
step S21: cleaning polyurethane sponge and stirring conductive paste at the same time;
step S22: pouring the stirred conductive paste into spraying equipment;
step S23: starting the spraying equipment, and spraying the conductive paste on the polyurethane sponge to form an electronic skin semi-finished product;
step S24: and drying and curing the electronic skin semi-finished product to form the intermediate skin layer.
Optionally, the manufacturing process of the polyurethane sponge in step S21 is as follows:
step S211: uniformly mixing polyurethane raw materials, polyether, azodicarbonamide, dicumyl peroxide and adhesive resin together to form a semi-finished product raw material;
step S212: pouring the mixed semi-finished raw materials into a mould, and sealing the mould;
step S213: injecting a foaming agent into the mould, and introducing pressure air into the mould to expand the semi-finished product raw material into a spongy polymer with a loose porous structure;
step S214: and drying, curing and cutting the sponge polymer to form the polyurethane sponge.
Optionally, the manufacturing process of the conductive paste comprises the following steps:
step S215: uniformly mixing the carbon nano tube, nickel powder, brass powder and silver powder to form conductive powder;
step S2: mixing the conductive powder and a pure water solvent in proportion to uniformly disperse the conductive powder in the pure water solvent to form stable conductive dispersion liquid;
step S3: carrying out paper separation and filtration on the conductive dispersion liquid;
step S4: and mixing isoamyl acetate and a pure water solvent in proportion to prepare a diluent, and mixing the conductive dispersion liquid and the diluent in proportion to prepare the conductive paste.
Optionally, in step S3, the drying, curing, trimming and insulating edge sealing treatment of the sensor semi-finished product is specifically operated as:
step S31: naturally drying the semi-finished sensor at room temperature for 10-14 hours, or drying the semi-finished sensor at 40-60 ℃ by using drying equipment until the conductive adhesive is completely cured;
step S32: and (3) flatly cutting the periphery of the solidified sensor semi-finished product by using a cutter, uniformly coating insulating paint on the periphery of the cut sensor semi-finished product, and drying at normal temperature to prepare the flexible high-sensitivity touch sensor.
The flexible high-sensitivity touch sensor is manufactured by sticking two conductive fiber fabric layers on the front and back sides of a middle skin layer by using a conductive adhesive, drying, curing, trimming and insulating edge sealing, and has the advantages of simple manufacturing process and low manufacturing cost, and solves the technical problems of complex process and high manufacturing process of the high-sensitivity sensor in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a test chart of a flexible high-sensitivity tactile sensor test response speed provided by an embodiment of the invention;
FIG. 2 is a data graph of 1N compression force test response accuracy for a flexible high sensitivity tactile sensor provided by an embodiment of the invention;
FIG. 3 is a data graph of the response accuracy of a flexible high-sensitivity tactile sensor according to an embodiment of the present invention tested with a 5N compression force;
FIG. 4 is a data graph of the response accuracy of the flexible high-sensitivity tactile sensor according to an embodiment of the present invention tested with a pressing force of 10N;
FIG. 5 is a data graph of the response accuracy of a flexible high-sensitivity tactile sensor according to an embodiment of the present invention tested with a 50N compression force;
FIG. 6 is a data graph of 100N compression force test response accuracy for a flexible high sensitivity tactile sensor provided by an embodiment of the invention;
FIG. 7 is a plot of effective compression point density for a flexible high sensitivity tactile sensor according to an embodiment of the invention for testing high detection density;
FIG. 8 is an enlarged view of an effective number of compression points density for testing high detection density of a flexible high sensitivity tactile sensor provided by embodiments of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
In the description of the present invention, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., refer to an orientation or positional relationship based on that shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
The invention provides a manufacturing process of a flexible high-sensitivity touch sensor, which comprises the following operation steps:
step S1: spreading two conductive fiber fabric layers on a workbench, and uniformly coating a conductive adhesive with conductive performance on the surface of the conductive fiber fabric layers;
step S2: the two coated conductive fiber fabric layers are respectively and flatly attached to the front side and the back side of the middle skin layer, and the flattening fixture is used for pressing the front side and the back side of the middle skin layer, so that the middle skin layer and the conductive fiber fabric layers are tightly attached to each other, and a sensor semi-finished product is manufactured;
step S3: and drying, solidifying, trimming and insulating edge sealing the semi-finished product of the sensor to prepare the flexible high-sensitivity touch sensor.
The flexible high-sensitivity touch sensor is manufactured by sticking two conductive fiber fabric layers on the front and back sides of a middle skin layer by using a conductive adhesive, drying, curing, trimming and insulating edge sealing, and has the advantages of simple manufacturing process and low manufacturing cost, and solves the technical problems of complex process and high manufacturing process of the high-sensitivity sensor in the prior art.
As an alternative embodiment, the manufacturing process of the conductive fiber fabric layer in step S1 is as follows:
step S11: electroplating copper and nickel on the polyester filaments by adopting an electrophoresis technology to form conductive fibers so as to achieve the effects of conductivity and softness;
step S12: conducting fiber and common fiber are mixed and woven in a ratio of 0.8:1-1.2:1 to prepare a semi-finished product of the conducting fiber fabric;
step S13: carrying out surface oxidation treatment on the semi-finished product of the conductive fiber fabric, and spraying an antioxidant to prevent the surface of the conductive fiber fabric layer from being oxidized so as to improve the conductivity and durability of the conductive fiber fabric layer and form the conductive fiber fabric layer;
the resistance of the conductive fiber fabric layer can be detected, and the resistance of the conductive fiber fabric layer which is required to be selected is smaller than 0.1 omega, so that the overall conductivity of the conductive fiber fabric layer is ensured.
For example, a conductive fiber fabric layer 300mm long and 200mm wide was used as a sample for testing, and the performance parameters were as follows: the color is silver gray, and the gram weight is 65-75g/m 2 The thickness is 0.07-0.08 mm, and the measured value of the surface resistance is 0.05 omega. The flexible material containing silver ion conductive fibers in the conductive fiber fabric layer has good conductive, shielding and heat conduction performances.
As an alternative embodiment, the manufacturing process of the conductive adhesive in step S1 is as follows:
the conductive paste and the resin adhesive are mixed in a ratio of 2.4:1-3.6:1 to prepare the conductive adhesive, and the conductive adhesive has conductive performance so as to reduce the influence of the conductive adhesive on the conductive performance of the flexible high-sensitivity touch sensor.
As an alternative embodiment, the manufacturing process of the intermediate skin layer in step S2 is as follows:
step S21: cleaning the polyurethane sponge to ensure that the conductive paste can be fully attached to the surface of the polyurethane sponge and completely infiltrate the inside; simultaneously stirring the conductive paste, and uniformly stirring to ensure uniform distribution of particles in the conductive paste;
step S22: pouring the stirred conductive paste into spraying equipment, adopting a fan-shaped 45-degree atomizing nozzle, and adjusting the air pressure of the spraying equipment to be 0.4 Mpa-0.8 Mpa, so that the conductive paste sprayed by the spraying equipment is in an atomized state and has no dripping phenomenon;
step S23: starting a spraying device, aligning an atomization nozzle with the surface of the polyurethane sponge, uniformly spraying the conductive paste on the polyurethane sponge, and preventing the overlapping part from being excessively sprayed to form an electronic skin semi-finished product in order to ensure uniform spraying and to enable the conductive paste to infiltrate into the inside, wherein the spraying frequency of the same part of the polyurethane sponge is not more than 3 times;
step S24: drying and curing the electronic skin semi-finished product, wherein the specific operation is that the electronic skin semi-finished product is naturally dried for 40-60 hours at room temperature, or the drying equipment is used for accelerating the drying at the temperature of 70-90 ℃ until the conductive paste is completely cured to form an intermediate skin layer;
the resistance of the middle skin layer can be measured by adopting a resistance meter, and whether the resistance value of the middle skin layer is stable and uniform can be checked.
The middle skin layer is made of loose, porous and high-elasticity polyurethane materials, and a large number of free conductive tiny particles exist in the middle skin layer after the middle skin layer is treated by spraying conductive paste.
In a normal state, the conductive tiny particles are far apart, the resistance value between the front surface and the back surface of the middle skin layer is extremely large, even in an open circuit state, and the conductive tiny particles have stable resistance isolation performance; after being pressed by external force, the middle skin layer is deformed and compressed, so that the distance between the conductive micro particles in the middle is reduced, and the resistance value between the front surface and the back surface of the middle skin layer is reduced; and the larger the deformation compression amount of the front and back surfaces of the middle skin layer is, the smaller the distance between the conductive tiny particles is, so that the smaller the resistance is, and a certain linear relation is presented.
According to the definition of resistance: r=ρt/S, where ρ is resistivity, T is thickness, and S is cross-sectional area. Wherein the determinants influencing the magnitude of the resistance and the corresponding rate of change of the resistance are ρ, T and S, the material of the intermediate skin layer determines the magnitude of ρ, and the shape of the intermediate skin layer determines the magnitude of T and S, i.e. the tensile deformation rate of the intermediate skin layer.
In order to obtain good flexibility and stretchability, the foaming molding material of polyurethane is innovatively selected, a large number of loose and porous bubbles exist in the molding material, and the structure has high rebound resilience and flexibility. Therefore, the slight stress can reflect the change of T and S. After the polyurethane is formed, a large amount of conductive tiny particles are filled in the pores of the polyurethane through spraying and soaking treatment of the conductive paste. The resistivity ρ of these conductive fine particles is a variable amount per unit area, and according to the formula ρ=ρ 'D, ρ' is the resistivity of the fixed material, and D is the inter-conductive fine particle distance.
Therefore, the deformation of the polyurethane sponge directly influences the change of rho besides determining the change of T and S, solves the problem that the rho value of the fixing material is fixed, and finally solves the problems of extremely high detection precision under slight deformation and difficult overload of an electric signal under extremely large deformation by utilizing the change of the rho value, the T value, the S value and the like of the fixing material, thereby greatly improving the change efficiency and the speed of the resistor R and finally greatly improving the response precision and the response speed of the flexible high-sensitivity tactile sensor.
As an alternative embodiment, the manufacturing process of the polyurethane sponge in step S21 is as follows:
step S211: uniformly mixing polyurethane raw materials, polyether, azodicarbonamide, dicumyl peroxide and adhesive resin together to form a semi-finished product raw material;
step S212: pouring the mixed semi-finished raw materials into a mould, and sealing the mould;
step S213: injecting a foaming agent into a mould, wherein the addition amount of the foaming agent is 10% of the total raw material volume, and introducing 50-70 kpa of pressure air into the mould to expand the semi-finished raw material into a spongy polymer with a loose porous structure;
step S214: drying, solidifying and cutting the sponge polymer, wherein the specific operation is that the sponge polymer is placed at the temperature of 40-60 ℃ and solidified for more than 10 hours, so that the sponge polymer has certain strength and stability, and then the solidified sponge polymer is cut to form polyurethane sponge according to the required shape and size.
As an alternative embodiment, the manufacturing process of the conductive paste is as follows:
step S215: uniformly mixing the carbon nano tube, nickel powder, brass powder and silver powder to form conductive powder;
step S2: mixing conductive powder and pure water solvent in a ratio of 1:6-1:4 to uniformly disperse the conductive powder in the pure water solvent to form stable conductive dispersion;
step S3: carrying out paper separation and filtration on the conductive dispersion liquid to remove impurities and large particles in the conductive dispersion liquid so as to ensure the purity and uniformity of the conductive dispersion liquid;
step S4: the isoamyl acetate and the pure water solvent are mixed according to the proportion of 1:120-1:80 to prepare a diluent, and then the conductive dispersion liquid and the diluent are mixed according to the proportion of 1:120-1:80 to prepare the resistance conductive paste.
As an alternative embodiment, in step S3, the drying, curing, trimming and insulating edge sealing treatment of the sensor semi-finished product operates specifically as:
step S31: naturally drying the semi-finished sensor product at room temperature for 10-14 hours, or drying the semi-finished sensor product at 40-60 ℃ by using drying equipment until the conductive adhesive is completely cured, so that the adhesion between the middle skin layer and the conductive fiber fabric layer can be ensured without separation;
step S32: the periphery of the sensor semi-finished product after being cut and solidified is flattened by a cutter, and the conductive adhesive which prevents overflowing adheres the conductive fiber fabric layers on the front surface and the back surface together, so that the manufactured flexible high-sensitivity touch sensor is prevented from being in a complete conduction state; and then uniformly coating the insulating paint on the periphery of the cut sensor semi-finished product to ensure that the periphery of the sensor semi-finished product is in a sealed and insulating state, and drying at normal temperature to prepare the flexible high-sensitivity touch sensor.
The flexible high-sensitivity touch sensor manufactured by the invention has the following advantages:
1. high flexibility and folding resistance: the flexible fiber material has high flexibility, high stretchability, bending resistance and easy processing. Compared with the existing film pressure sensor, the stretching rate is higher than 50%, and the bending radius can be as low as 0.5mm.
2. High sensitivity: the pressure of 0.1 to hundreds of cattle can be sensitively detected, the detection range is wide, and the sensitivity is high. Compared with the sensor pressure sensor, the sensor can simultaneously give consideration to extremely high detection precision and cover a wide measurement range.
3. High detection density: the unit area has extremely high effective detection density, and the effective detection point number can reach 4 ten thousand points in 100mm of 100mm area, which is far higher than the detection density of the existing multipoint pressure sensor.
4. The detection area can be infinitely extended: because of the specificity of the structure, the working procedures of cutting, splicing, folding and the like can be conveniently carried out, so that the detection area can be infinitely increased with low cost, the pressure detection device is suitable for pressure detection in a large scale range, and the laying of the detection area of hundreds of square meters can be achieved.
Therefore, the flexible high-sensitivity touch sensor is suitable for all application scenes such as robot electronic protection skin, safety carpet, safety door anti-clamping, manipulator grabbing detection and the like, which need touch pressing, collision detection, safety protection and the like.
Referring to fig. 1, a test chart of test response speed of a flexible high-sensitivity tactile sensor:
a flexible high-sensitivity tactile sensor sample with the length of 100mm, the width of 100mm and the thickness of 5mm is connected to an oscilloscope instrument, and the rising Time (Rise Time) is recorded by inputting a 20ms square wave signal: the Time from the start of the input signal change to the output signal reaching its final value is 11.1ms, and the Fall Time (Fall Time) is recorded: the Response Time (Response Time) is calculated from the end of the input signal change to the Time at which the output signal reaches its final value of 10.6 ms: the average of the rise time and fall time, i.e. 10.85ms.
Referring to fig. 2-6, the flexible high-sensitivity tactile sensor with the length of 100mm, the width of 100mm and the thickness of 5mm is taken as a sample to test response precision, the test is repeated for a plurality of times by pressing forces of 1N, 5N, 10N, 50N and 100N, the resistance value is recorded, and the error range is smaller than 1% after the plurality of times of tests.
Referring to fig. 6 and 8, a flexible high-sensitivity tactile sensor with a length of 100mm, a width of 100mm and a thickness of 2mm is used as a sample to test high detection density, a standard cylindrical pressing head with a diameter of 1mm is arranged at the tail end of a robot, the flexible high-sensitivity tactile sensor is pressed once respectively from the X, Y direction of the flexible high-sensitivity tactile sensor by the movement of the robot with a feeding amount of 0.5mm each time, and the effective pressing can be seen through instrument display; through calculation, the lengths of the X direction and the Y direction are respectively 100mm, the feeding amount is 0.5mm, so that the effective pressing points of each row and each column are respectively 100mm/0.5 mm=200, and the effective points of the comprehensive XY matrix are: 200 x 200 = 40000 effective compression point number density.
The following destructive test was performed on a flexible high-sensitivity tactile sensor 300mm long, 200mm wide and 3mm thick as a sample:
1. violently kneading, folding, pulling and the like;
2. carrying out 500kg overload pressing by using a pressure tester;
3. penetrating puncture is carried out on the needle by sewing;
4. cutting it with scissors (remaining connected to the main body);
after the flexible high-sensitivity touch sensor is tidied and restored, the pressing test is performed again, so that the flexible high-sensitivity touch sensor can be effectively detected.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The manufacturing process of the flexible high-sensitivity touch sensor is characterized by comprising the following operation steps of:
step S1: spreading two conductive fiber fabric layers on a workbench, and uniformly coating a conductive adhesive on the surfaces of the conductive fiber fabric layers;
step S2: respectively flatly attaching the two coated conductive fiber fabric layers on the front and back sides of the middle skin layer to prepare a sensor semi-finished product;
step S3: and drying, solidifying, trimming and insulating edge sealing the semi-finished product of the sensor to prepare the flexible high-sensitivity touch sensor.
2. The process for manufacturing a flexible high-sensitivity tactile sensor according to claim 1, wherein the process for manufacturing the conductive fiber fabric layer in step S1 is as follows:
step S11: electroplating copper and nickel on the polyester filaments by adopting an electrophoresis technology to form conductive fibers;
step S12: the conductive fibers and the common fibers are mixed and woven in proportion to prepare a semi-finished product of the conductive fiber fabric;
step S13: and carrying out surface oxidation treatment on the semi-finished product of the conductive fiber fabric to form a conductive fiber fabric layer.
3. The process for manufacturing a flexible high-sensitivity tactile sensor according to claim 1, wherein the process for manufacturing the conductive adhesive in step S1 is as follows:
and mixing the conductive paste and the resin adhesive in proportion to prepare the conductive adhesive.
4. The process for manufacturing a flexible high-sensitivity tactile sensor according to claim 1, wherein said process for manufacturing said intermediate skin layer in step S2 comprises:
step S21: cleaning polyurethane sponge and stirring conductive paste at the same time;
step S22: pouring the stirred conductive paste into spraying equipment;
step S23: starting the spraying equipment, and spraying the conductive paste on the polyurethane sponge to form an electronic skin semi-finished product;
step S24: and drying and curing the electronic skin semi-finished product to form the intermediate skin layer.
5. The process for manufacturing a flexible high-sensitivity tactile sensor according to claim 4, wherein the process for manufacturing the polyurethane sponge in step S21 is as follows:
step S211: uniformly mixing polyurethane raw materials, polyether, azodicarbonamide, dicumyl peroxide and adhesive resin together to form a semi-finished product raw material;
step S212: pouring the mixed semi-finished raw materials into a mould, and sealing the mould;
step S213: injecting a foaming agent into the mould, and introducing pressure air into the mould to expand the semi-finished product raw material into a spongy polymer with a loose porous structure;
step S214: and drying, curing and cutting the sponge polymer to form the polyurethane sponge.
6. The process for manufacturing a flexible high-sensitivity tactile sensor according to claim 3 or 4, wherein the process for manufacturing the conductive paste is as follows:
step S215: uniformly mixing the carbon nano tube, nickel powder, brass powder and silver powder to form conductive powder;
step S2: mixing the conductive powder and a pure water solvent in proportion to uniformly disperse the conductive powder in the pure water solvent to form stable conductive dispersion liquid;
step S3: carrying out paper separation and filtration on the conductive dispersion liquid;
step S4: and mixing isoamyl acetate and a pure water solvent in proportion to prepare a diluent, and mixing the conductive dispersion liquid and the diluent in proportion to prepare the conductive paste.
7. The process for manufacturing a flexible high-sensitivity tactile sensor according to claim 1, wherein in step S3, the drying, curing, trimming and insulating edge sealing process of the semi-finished product of the sensor is specifically performed as follows:
step S31: naturally drying the semi-finished sensor at room temperature for 10-14 hours, or drying the semi-finished sensor at 40-60 ℃ by using drying equipment until the conductive adhesive is completely cured;
step S32: and (3) flatly cutting the periphery of the solidified sensor semi-finished product by using a cutter, uniformly coating insulating paint on the periphery of the cut sensor semi-finished product, and drying at normal temperature to prepare the flexible high-sensitivity touch sensor.
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