Testing device and testing method for measuring scratchiness of fabric based on compression modulus

Abstract

The invention discloses a testing device and a testing method for measuring the scratchiness of a fabric based on a compression modulus. The testing device comprises a clamping mechanism used for fixing a fabric to be tested, an electrode plate arranged on the clamping mechanism, a flat film sensor arranged above the clamping mechanism and a lifting adjusting mechanism used for controlling the flat film sensor to move longitudinally, and a lifting piece is arranged on the lifting adjusting mechanism. And the lifting piece is fixedly connected with the flat film sensor. During measurement, an external sensing detection analyzer reads numerical values measured by the flat film sensor, the numerical values are imported into a computer to be analyzed and calculated, a fabric scratchiness probability curve is drawn, and the sensing detection analyzer can be connected with a display to display and analyze various measured data. The planar flat film sensor is used for capturing and measuring the protruding fibers on the surface of the wool fabric, is more accurate and accords with the state that a human body makes contact with the fabric, has more reference value for evaluation of the contact itching feeling, and is simple, easy to understand and easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of fabric detection, and in particular to a testing device and a testing method for measuring the itching sensation of fabric based on compression modulus. Background Art

[0002] Wool products are essential items for keeping warm in winter. They are loved by consumers for their plump and soft touch and good thermal insulation effect. However, wool products are prone to pilling. In addition, wool fibers themselves have a certain degree of roughness and many tiny scale-like structures on the surface. These scales are prone to friction when in contact with the skin, causing skin discomfort. Some chemicals may remain in the wool sweater during processing, such as dyes and softeners. These chemicals can also irritate the skin, further exacerbating the itching sensation. And due to different skin sensitivities, some people are more sensitive to wool fibers and are more likely to feel itchy. This itching sensation can cause great discomfort to the wearer, thus affecting consumers' enthusiasm for purchasing wool products. At present, the quantitative measurement of the itching sensation of wool fabrics is not comprehensive enough, and it is not commonly used in general fabric property testing.

[0003] According to textile physics, we know that the itchiness of fabric is directly related to the number and modulus of protruding fibers on the fabric surface. Therefore, we consider inventing a detection device and a detection method based on compression modulus to test the modulus and probability of protruding fibers on the surface of wool fabrics, so as to quantitatively characterize the itchiness of wool fabrics.

[0004] At present, the detection methods of itching comfort mainly include subjective detection method and objective detection method. Subjective detection methods include animal electrode stimulation method, forearm sleeve wearing evaluation method, and full clothing fitting evaluation method. These subjective methods have problems such as large individual differences in feeling, difficulty in accurate description in words, long detection cycle, and high detection cost in practice, so they are difficult to be widely used. Objective detection methods include low-stress compression instrument, laser counter method, audio test bay method, etc. Among them: the low-stress compression instrument method has the problem of measuring the amount of hairiness on the surface of the fabric, but fails to distinguish the high and low hairiness stiffness, causing large errors; the laser counter method has the problem of low sensitivity in measuring protruding fibers, the inability to detect thinner and transparent fibers, the difficulty in separating multiple overlapping fibers, the inability to obtain the exact number of hairiness and the specific fiber bending stiffness, and the low repeatability of actual operation; the audio test bay method has the problem that the probe may pass through the middle of the entangled hairiness to cause errors. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to provide a testing device and a testing method for measuring the itching sensation of fabrics based on compression modulus.

[0006] In order to achieve the above object, the technical solution of the present invention is: A testing device for measuring the itchiness of fabric based on compression modulus, comprising a clamping mechanism for fixing the fabric to be tested, an electrode plate arranged on the clamping mechanism, a flat film sensor arranged above the clamping mechanism, and a lifting and adjusting mechanism for controlling the longitudinal movement of the flat film sensor, wherein a lifting member is arranged on the lifting and adjusting mechanism, and the lifting member is fixedly connected to the flat film sensor.

[0007] Preferably, the lifting and adjusting mechanism includes a base, a bracket arranged on the base, a screw rod longitudinally arranged on the bracket, and a power mechanism for driving the screw rod to rotate, and the lifting member is connected to the screw rod and moves up and down as the screw rod rotates.

[0008] Preferably, the power mechanism includes a worm wheel coaxially arranged at one end of the lead screw, a worm matched with the worm wheel, and a motor arranged at one side of the worm, and the output shaft of the motor is coaxially connected to the worm.

[0009] Preferably, the clamping mechanism includes a base plate, and stretching clamps are provided on both sides of the base plate, and the stretching clamps include a mounting column arranged on the base plate, a transverse clamping plate slidably arranged on the mounting column, and a side clamping plate arranged on one side of the bottom of the transverse clamping plate and extending obliquely, and the end of the side clamping plate abuts against the side of the base plate; a limiting block is provided on the top of the mounting column, and a spring 1 is also sleeved on the mounting column, and the two ends of the spring 1 respectively abut against the limiting block and the transverse clamping plate.

[0010] Preferably, an elastic sheet slot is provided at the connection between the transverse clamping plate and the side clamping plate, and an elastic sheet is inserted into the elastic sheet slot; the elastic sheet is bent as a whole, and includes a transverse elastic sheet located in the transverse clamping plate and a lateral elastic sheet located in the side clamping plate, and the transverse elastic sheet and the lateral elastic sheet are integrally formed.

[0011] Preferably, a locking mechanism is also provided on the lifting and adjusting mechanism, and the locking mechanism includes a mounting groove opened on the side of the bracket, a one-way tooth plate longitudinally arranged in the mounting groove, and a spring 2 arranged between the inner side wall of the mounting groove and the one-way tooth plate, and the two ends of the spring 2 are respectively fixedly connected to the inner side wall of the mounting groove and the one-way tooth plate; the side of the lifting member is provided with a latch tooth matching the one-way tooth plate, and the latch tooth extends into the mounting groove and engages with the one-way tooth plate.

[0012] Preferably, a handle is provided on the side of the one-way tooth plate, and the handle passes through the inner side wall of the mounting groove and extends to the other side of the bracket.

[0013] Preferably, the lifting member is further provided with a reinforcing member, one end of which is connected to the screw rod and moves up and down with the rotation of the screw rod.

[0014] A test method for measuring the itchiness of fabrics based on compression modulus, comprising the following steps: Step 1: Adjust the temperature and humidity of the fabric, cut it into samples and place them on the bottom plate, so that the fabric completely covers the electrode plate; Step 2: Power on the electrode plate and use the electrostatic effect until the surface fibers are visible to the naked eye, then disconnect the power supply; Step 3: Control the flat film sensor to move downward through the lifting and adjusting mechanism until the flat film sensor stops when it is 0.35mm away from the cloth surface; Step 4: Use an external sensor detection analyzer to read the values ​​measured by the flat film sensor and import them into the computer for analysis and calculation. The calculation method and formula are as follows: Fx=Ppressure≤X mN=Number of sensors that detect pressure below X mN / 100X=10,20,30,40,50,60,70,80,90,100 The probability curve of fabric itching sensation is obtained by drawing according to the above formula.

[0015] Among them, the relationship function between the amount of electricity and the thickness of the fabric in the second step is as follows: U=500+50x U is the charge and x is the fabric thickness.

[0016] The beneficial effects of the present invention are: 1. The present invention uses a flat film sensor based on compression modulus to capture and measure the fibers protruding from the surface of wool fabric, which is more accurate and consistent with the state of human body contacting the fabric, and has more reference value for the evaluation of contact itching sensation.

[0017] 2. The testing device of the present invention is relatively compact and has a stable structure. It adopts a lifting and adjusting mechanism controlled by a motor and cooperates with a locking mechanism. It has high control accuracy and can stay stably at any height and is easy to operate.

[0018] 3. The present invention is suitable for various fabrics, not only wool worsted fabrics, but also various fabrics on the market that need to be tested for itch sensation can use the testing device and testing method provided by the present invention. The testing method is simple, easy to understand and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 for Figure 2 The enlarged view of point A in the middle; Figure 4 It is a structural schematic diagram of the power mechanism of the present invention; Figure 5It is a schematic diagram of the structure of the flat film sensor of the present invention; Figure 6 It is a structural schematic diagram of the clamping mechanism of the present invention; Figure 7 is a cross-sectional view of the clamping mechanism of the present invention; Figure 8 It is a schematic diagram of the structure of the transverse clamping plate and the side clamping plate of the present invention; Fig. 9 This is a probability curve diagram of fabric itching measured in Example 1; Fig.10 This is a probability curve diagram of fabric itching measured in Example 2; Fig.11 This is a curve diagram of the probability of fabric itching measured in Example 3; Fig.12 This is a curve diagram of the probability of fabric itching measured in Example 4. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with embodiments.

[0021] like Figure 1-8 The test device for measuring the irritation of fabrics based on compression modulus shown in the figure comprises a clamping mechanism 1 for fixing the fabric to be tested, an electrode plate 6 arranged on the clamping mechanism 1, a flat film sensor 2 arranged above the clamping mechanism 1, and a lifting and adjusting mechanism 3 for controlling the longitudinal movement of the flat film sensor 2, wherein the lifting and adjusting mechanism 3 is provided with a lifting member 31, and the lifting member 31 is fixedly connected to the flat film sensor 2. The size of the flat film sensor can be set to 100mm×100mm, which is divided into 100 grid areas of 10mm×10mm and distributed in an array, and each grid area has a micro pressure sensor.

[0022] The lifting and adjusting mechanism 3 includes a base 32, a bracket 33 arranged on the base 32, a screw 34 longitudinally arranged on the bracket 33, and a power mechanism 4 for driving the screw 34 to rotate. The lifting member 31 is provided with a screw nut matched with the screw 34. The lifting member 31 is connected to the screw 34 and can move up and down with the rotation of the screw 34. The upper end of the screw 34 is rotatably connected to the bracket, and a mounting seat can be arranged on the base 32, and the lower end of the screw 34 is rotatably connected to the mounting seat. The power mechanism 4 includes a worm gear 41 coaxially arranged at one end of the screw 34, a worm 42 matched with the worm gear 41, and a motor 43 arranged on one side of the worm 42, and the output shaft of the motor 43 is coaxially connected with the worm 42. The worm gear 41 is generally arranged at the lower end of the screw 34, and the worm 42 can be arranged on the base 32 through a matching mounting frame. The motor 43 preferably adopts a stepping motor or a servo motor and the motor 43 is installed on one side of the screw 34. By controlling the motor 43 to rotate, the worm 42 can be driven to rotate synchronously, and then the worm 42 drives the worm wheel 41 and the lead screw 34 to rotate, thereby realizing the lifting and lowering control of the lifting member 31.

[0023] The clamping mechanism 1 can be implemented in a variety of forms, such as a structure that is directly fixed by a clip, or a clamping plate mechanism that is adjusted and fixed by a nut. In one implementation of the clamping mechanism 1, the clamping mechanism 1 includes a base plate 11, and the electrode plate 6 can be embedded on the top of the base plate 11. Both sides of the base plate 11 are provided with stretching clamps 12, and the stretching clamps 12 include a mounting column 13 arranged on the base plate 11, a transverse clamping plate 14 slidably arranged on the mounting column 13, and a side clamping plate 141 arranged on one side of the bottom of the transverse clamping plate 14 and extending obliquely, and the end of the side clamping plate 141 is in contact with the side of the base plate 11, that is, the end of the side clamping plate 141 can apply a certain pressure to the side of the base plate 11. The side clamping plate 141 is preferably made of a material with a large friction coefficient, such as rubber. A limit block 15 is provided on the top of the mounting column 13, and a spring 16 is also sleeved on the mounting column 13, and the two ends of the spring 16 are respectively in contact with the limit block 15 and the transverse clamping plate 14. When the fabric to be measured is fixed to the bottom plate 11, it is generally necessary to flatten the fabric manually, and it is often difficult to flatten the fabric. However, with the structure of the above-mentioned clamping mechanism 1, when the transverse clamping plate 14 and the side clamping plate 141 are pressed down by the spring, the side clamping plate 141 can resist the side of the fabric and apply a downward pulling force to both sides of the fabric to be measured as the side clamping plate 141 moves downward, so that the fabric to be measured is flattened, ensuring the accuracy and stability of the measurement results.

[0024] As a preferred solution, an elastic sheet slot 5 is provided at the connection between the transverse clamping plate 14 and the side clamping plate 141, and an elastic sheet 51 is inserted into the elastic sheet slot 5. The elastic sheet 51 is bent as a whole, and includes a transverse elastic sheet 52 located in the transverse clamping plate 14 and a lateral elastic sheet 53 located in the side clamping plate 141, and the transverse elastic sheet 52 and the lateral elastic sheet 53 are integrally formed. The design of the elastic sheet 51 can make the lateral pressure of the side clamping plate 141 on the bottom plate 11 more stable, and also make the overall structure of the transverse clamping plate 14 and the side clamping plate 141 more stable. When necessary, the elastic sheet 51 can also be easily replaced.

[0025] As another preferred solution, the lifting and adjusting mechanism 3 is also provided with a locking mechanism, which includes a mounting groove 71 provided on the side of the bracket 33, a one-way tooth plate 77 longitudinally provided in the mounting groove 71, and a spring 17 provided between the inner side wall of the mounting groove 71 and the one-way tooth plate 77, and the two ends of the spring 17 are respectively fixedly connected to the inner side wall of the mounting groove 71 and the one-way tooth plate 77. The spring 17 can be provided with multiple springs 17 and evenly distributed in the mounting groove 71. The spring 17 makes the one-way tooth plate 77 usually in a fixed initial position, and can move when subjected to thrust and reset after the thrust disappears. The side of the lifting member 31 is provided with a latching tooth 72 matching the one-way tooth plate 77, and the latching tooth 72 extends into the mounting groove 71 and meshes with the one-way tooth plate 77. The tooth shape of the one-way tooth plate 77 is inclined on the upper side and horizontal on the lower side. This structure allows the latching tooth 72 to move down smoothly, but when moving up, it will be stuck by the teeth on the one-way tooth plate 77 and cannot move up, so as to lock the lifting member 31. The above locking mechanism is combined with the worm gear transmission structure that has a certain locking effect, so that the lifting member 31 can stay stably at any height. Balls 79 can also be provided on both sides of the latching tooth 72, and the friction force when the latching tooth 72 moves can be reduced by the contact between the ball 79 and the inner wall of the mounting groove 71.

[0026] In order to facilitate the movement of the one-way tooth plate 77 when the lifting member 31 needs to move upward, a handle 74 is provided on the side of the one-way tooth plate 77, and the handle 74 extends through the inner wall of the mounting groove 71 to the other side of the bracket 33. This design allows the operator to separate the one-way tooth plate 77 from the latch 72 by simply pulling the handle 74. In addition, under the action of the spring 17, the one-way tooth plate 77 can also be reset. A reinforcing member 35 is also provided on the lifting member 31. A screw nut connected to the screw 34 is provided on one end of the reinforcing member 35, and the other end is fixedly connected to the lifting member 31, and it can move up and down with the rotation of the screw 34. The design of the reinforcing member 35 makes the structure of the lifting member 31 more stable, while reducing the shaking of the flat film sensor 2 when it moves up and down, thereby reducing the measurement error.

[0027] A test method for measuring the itchiness of fabrics based on compression modulus, comprising the following steps: Step 1: Adjust the temperature and humidity of the fabric to be tested according to the requirements of GB / T6529, cut it into samples and fix it on the clamping mechanism 1. Note that the fabric should cover the bottom plate 11 as much as possible / completely, and the fabric should completely cover the electrode plate 6; Step 2: Power the electrode plate 6. The amount of electricity is adjusted according to the thickness of the wool fabric and the fiber thickness, generally ranging from 500V to 1500V. Use the electrostatic effect until the surface fibers are visibly erected, then disconnect the power supply. The relationship between the amount of electricity and the thickness of the fabric is as follows: U=500+50x U is the charge, x is the fabric thickness. In actual operation, this formula is used as the reference parameter setting. Fine adjustments can be made according to the actual fiber uprightness until the surface fibers are visibly erected. If they are not fully erected, the voltage can be adjusted until they are fully erected.

[0028] Step 3: Control the flat film sensor 2 to move downward through the lifting adjustment mechanism 3 until the flat film sensor 2 stops when it is 0.35 mm away from the cloth surface; Step 4: The external sensor detection analyzer reads the value measured by the flat film sensor 2 and imports it into the computer for analysis and calculation. The calculation method and formula are as follows: Fx=Ppressure≤X mN=Number of sensors that detect pressure below X mN / 100X=10,20,30,40,50,60,70,80,90,100 The probability curve of fabric itching sensation is obtained by drawing according to the above formula.

[0029] The external sensor detection analyzer can also be connected to a display to display and analyze various measured data.

[0030] The following are several specific embodiments: Example 1

[0031] 1mm thin wool fabric itching test A voltage of 550 volts is applied to the electrode plate, and the pressure sensor on the flat film sensor 2 has a measuring range of 0 to 100 mN.

[0032] The probability curve of fabric itching is measured as follows: Fig. 9 shown.

[0033] The probability curve of fabric itch shows that the probability of the fabric being between 40mN and 80mN is higher, and it has a certain itch. The probability distribution is relatively uniform, indicating that the fabric has more hairiness.

[0034] At the same time, if the testing method in FZ / T 01158-2022 is used, since it is a unidirectional test, it is necessary to test each direction 5 times, the workload increases, and the itching probability curve cannot be obtained, which is somewhat different from the actual wearing experience. Example 2

[0035] 5mm medium-thick cashmere fabric itching test A voltage of 750 volts is applied to the electrode plate, and the pressure sensor on the flat film sensor 2 has a measuring range of 0 to 100 mN.

[0036] The probability curve of fabric itching is measured as follows: Fig.10 shown.

[0037] It can be seen from the probability curve of the fabric itching that the probability of the fabric is higher between 0mN and 60mN, the itching sensation is weaker, but it is not completely smooth and has a fuller touch. Example 3

[0038] 10mm ultra-thick wool-like fabric itching test A voltage of 1000 volts is applied to the electrode plate, and the pressure sensor range on the flat film sensor 2 is set to 0-100 mN.

[0039] The probability curve of fabric itching is measured as follows: Fig.11 shown.

[0040] From the probability curve of fabric itch, it can be seen that the probability of the fabric is higher between 50mN and 80mN, indicating that the fabric has a certain itch. Given that the probability decreases from 0mN to 50mN, it can be seen that the fabric does not have much hairiness, but the fiber is relatively stiff. Example 4

[0041] 0.8mm thin ramie fabric itching test A voltage of 700 volts is applied to the electrode plate, and the pressure sensor range on the flat film sensor 2 is set to 0-100 mN.

[0042] The probability curve of fabric itching is measured as follows: Fig.12 shown.

[0043] The probability curve of fabric itch sensation shows that the probability of the fabric being between 0mN and 20mN is relatively high, indicating that the fabric is very smooth and almost hairless. However, there is some probability between 80mN and 100mN, which may be protruding fibers, which will have a certain impact on the wearing feel.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A testing device for measuring the itchiness of fabrics based on compression modulus, characterized in that: The invention comprises a clamping mechanism (1) for fixing a fabric to be tested, an electrode plate (6) arranged on the clamping mechanism (1), a flat film sensor (2) arranged above the clamping mechanism (1), and a lifting and adjusting mechanism (3) for controlling the longitudinal movement of the flat film sensor (2), wherein a lifting member (31) is arranged on the lifting and adjusting mechanism (3), and the lifting member (31) is fixedly connected to the flat film sensor (2).

2. The testing device for measuring the itching sensation of fabric based on compression modulus according to claim 1, characterized in that: The lifting and adjusting mechanism (3) comprises a base (32), a bracket (33) arranged on the base (32), a screw rod (34) longitudinally arranged on the bracket (33), and a power mechanism (4) for driving the screw rod (34) to rotate; the lifting member (31) is connected to the screw rod (34) and moves up and down as the screw rod (34) rotates.

3. The testing device for measuring the itching sensation of fabric based on compression modulus according to claim 2, characterized in that: The power mechanism (4) comprises a worm wheel (41) coaxially arranged at one end of the screw rod (34), a worm (42) matched with the worm wheel (41), and a motor (43) arranged at one side of the worm (42), wherein the output shaft of the motor (43) is coaxially connected to the worm (42).

4. The testing device for measuring the itching sensation of fabric based on compression modulus according to claim 1, characterized in that: The clamping mechanism (1) comprises a base plate (11), and a stretching clamp (12) is arranged on both sides of the base plate (11). The stretching clamp (12) comprises a mounting column (13) arranged on the base plate (11), a transverse clamping plate (14) slidably arranged on the mounting column (13), and a side clamping plate (141) arranged on one side of the bottom of the transverse clamping plate (14) and extending obliquely, wherein the end of the side clamping plate (141) contacts the side surface of the base plate (11); a limit block (15) is arranged on the top of the mounting column (13), and a spring (16) is also sleeved on the mounting column (13), and the two ends of the spring (16) contact the limit block (15) and the transverse clamping plate (14) respectively.

5. The testing device for measuring the itching sensation of fabric based on compression modulus according to claim 4, characterized in that: An elastic sheet slot (5) is provided at the connection between the transverse clamping plate (14) and the side clamping plate (141), and an elastic sheet (51) is inserted into the elastic sheet slot (5); the elastic sheet (51) is bent as a whole, and comprises a transverse elastic sheet (52) located in the transverse clamping plate (14) and a lateral elastic sheet (53) located in the side clamping plate (141); the transverse elastic sheet (52) and the lateral elastic sheet (53) are integrally formed.

6. The testing device for measuring the itching sensation of fabric based on compression modulus according to claim 2, characterized in that: The lifting and adjusting mechanism (3) is also provided with a locking mechanism, the locking mechanism comprising a mounting groove (71) provided on the side of the bracket (33), a one-way tooth plate (77) longitudinally arranged in the mounting groove (71), and a second spring (17) arranged between the inner side wall of the mounting groove (71) and the one-way tooth plate (77), the two ends of the second spring (17) being respectively fixedly connected to the inner side wall of the mounting groove (71) and the one-way tooth plate (77); a latching tooth (72) matching the one-way tooth plate (77) is provided on the side of the lifting member (31), the latching tooth (72) extending into the mounting groove (71) and meshing with the one-way tooth plate (77).

7. The testing device for measuring the itching sensation of fabric based on compression modulus according to claim 6, characterized in that: A handle (74) is provided on the side of the one-way toothed plate (77), and the handle (74) passes through the inner side wall of the mounting groove (71) and extends to the other side of the bracket (33).

8. The testing device for measuring the itching sensation of fabric based on compression modulus according to claim 2, characterized in that: The lifting member (31) is also provided with a reinforcing member (35), one end of which is connected to the screw rod (34) and moves up and down as the screw rod (34) rotates.

9. A test method for measuring the itchiness of fabrics based on compression modulus, characterized in that: The following steps are included: Step 1: Adjust the temperature and humidity of the fabric, cut it into samples and place them on the bottom plate, so that the fabric completely covers the electrode plate; Step 2: Power on the electrode plate and use the electrostatic effect until the surface fibers are visible to the naked eye, then disconnect the power supply; Step 3: Control the flat film sensor to move downward through the lifting and adjusting mechanism until the flat film sensor stops when it is 0.35mm away from the cloth surface; Step 4: Use an external sensor detection analyzer to read the values ​​measured by the flat film sensor and import them into the computer for analysis and calculation. The calculation method and formula are as follows: F(x) = P(pressure ≤ X mN) = number of sensors that detect a pressure of less than X mN / 100 (X = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100) The probability curve of fabric itching sensation is obtained by drawing according to the above formula.

10. The test method for measuring the itching sensation of fabric based on compression modulus according to claim 9, characterized in that: The relationship between the amount of electricity and the thickness of the fabric in the second step is as follows: U=500+50x U is the charge and x is the fabric thickness.

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