Fabric softness testing device and working method thereof

Abstract

A fabric softness testing device comprises two chucks, an adjustable light source, a vacuum housing, a high-pressure vacuum blower, and a three-dimensional sensing device. The two chucks are positioned horizontally relative to each other within the vacuum housing, with one end of each chuck connected to a power unit via a telescopic rod. The adjustable light source is mounted on the vacuum housing, with its axis and position aligning with the centerline of the two chucks. The vacuum housing is equipped with a high-pressure vacuum blower, and a three-dimensional sensing device is positioned on either side of each chuck. The three-dimensional sensing device, combined with image processing to digitize the test process, makes the test results more convincing and accurate. The device offers advantages such as simplicity, convenience, and accurate testing results.

Description

Technical Field

[0001] The present invention relates to the field of textile clothing performance testing, and in particular to a fabric softness testing device and method. Background Art

[0002] Fabric softness is a mechanical and physical indicator of fabrics. Its physical meaning is "the ability of a fabric to resist changes in shape along its bending direction." Different fabrics have varying internal and external qualities, resulting in varying degrees of softness. In the textile industry, varying fabric types and fiber spinning and weaving methods result in varying wear properties. Different softness, feel, and style determine the application areas and methods of textiles, and are directly related to the sales performance of these textiles. Therefore, testing material softness has become a key assessment indicator for fabric testing in the textile industry.

[0003] Existing softness testers include the M508 fabric softness tester, used to measure the rigidity and flexibility of fabrics, collar fabrics, non-woven fabrics, and artificial leather; the HOM softness tester, which can test materials including non-woven fabrics, sanitary napkins, facial tissue, films, and textiles; and specialized testers such as fabric softness testers, paper softness testers, leather softness testers, and linen softness testers. All of these testers have specific requirements for the material and surface smoothness of the test specimens, otherwise the results will be inaccurate. To determine the softness of specimens of varying materials and uneven surfaces, the test specimens must first be ironed to smooth them, and then the tester must be selected based on the material requirements of the tester. The variety of materials and the complexity of sample preparation increase the test workload and reduce instrument utilization, resulting in time-consuming, labor-intensive, and material-intensive testing. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a fabric softness testing device and method. The specific technical solutions are as follows:

[0005] Among them, a specific technology of a fabric softness testing device is:

[0006] A fabric softness testing device, characterized by comprising two clamps (2), an adjustable light source (6), a vacuum cover (5), a vacuum high-pressure blower (4), and a three-dimensional sensing device (3);

[0007] The two clamps (2) are relatively horizontally arranged in the vacuum cover (5), and one end of the clamp (2) is connected to the power device through a telescopic rod (7);

[0008] The adjustable light source (6) is mounted on the vacuum cover (5), and the axial direction and position of the adjustable light source (6) coincide with the center lines of the two clamps (2);

[0009] A vacuum high-pressure blower (4) is provided in the vacuum cover (5), and a three-dimensional sensing device (3) is correspondingly provided on any side of each clamp (2).

[0010] Among them, a working method of a fabric softness testing device is:

[0011] A working method of a fabric softness testing device is characterized by: adopting the following steps:

[0012] Use the following steps,

[0013] Step 1: Select the sample to be tested, select the size S of the sample to be tested, cut the sample to be tested into the size S, clamp the two ends of the sample to be tested between two clamps, and keep the fabric horizontal and natural length;

[0014] Step 2: Adjust the brightness of the adjustable light source to ensure that the image captured by the 3D sensing device is clear;

[0015] Step 3: Close the vacuum cover to make it closed;

[0016] Step 4: Turn on the vacuum high-pressure blower to extract the air in the device, so that the air pressure in the device drops below 0Pa;

[0017] Step 5: Release the sample from any chuck and let it fall freely;

[0018] Step 6: The 3D sensing device captures the fabric at the falling angle to form a 3D image;

[0019] Step 7: Using the information of the three-dimensional image, a spatial model is established to extract the softness index;

[0020] Step 8: Assume that when the fabric is clamped horizontally, the midpoint of the clamp is point O, the clamped edge is the X-axis, the direction perpendicular to the clamped edge is the Y-axis, and the direction perpendicular to the horizontal plane is the Z-axis. The angle θ is the angle between the line connecting the center of gravity G and point O, calculated by the computer based on the obtained data, and the straight line projected onto the XOY plane. Set the angle θ to 15°. At this angle, the coordinates of the center of gravity of the sample are G(x0, y0, z0). Assume that the falling distance of the sample is h0 = z0, and the falling time is t0.

[0021] Step 9: Take the height of the fabric falling 0.001s before and 0.001s after t0 as h -0.001 、h +0.001 , that is, h -0.001 =z 0-0.001 , h +0.001 =z 0+0.001 , then the velocity v at time t0 is 01 Can be obtained

[0022] Take the height of the fabric falling at 0.002s before and after t0 as h -0.002 、h +0.002 , that is, h -0.002 =z 0-0.002 , h +0.002 =z 0+0.002 , then the velocity v at time t0 is 02 Can be obtained

[0023] The height of the fabric falling at 0.003s before and 0.003s after t0 is h -0.003 、h +0.003 , that is, h -0.003 =z 0-0.003 , h +0.003 =z 0+0.003 , then the velocity v at time t0 is 03 Can be obtained

[0024] Step 10: In v 01 、v 02 、v 03 Choose any two speeds and take the average value to get the speed v0 at t0;

[0025] Step 11: Substitute h0 and v0 into the formula using the law of conservation of energy:

[0026]

[0027] γ is the softness reference value, g is the gravity constant, v is the velocity, and (x, y, z) is the spatial coordinate point;

[0028] Step 12: Determine the softness of the sample based on the size of γ. A standard value C is set. If γ is greater than the standard value C, it means that the sample is very soft. If γ is less than the standard value C, it means that the sample is not very soft.

[0029] Furthermore, the calculation formula of the center of gravity G(x0, y0, z0) in step 8 is:

[0030] S1: Tiled sample, denoted as S(x, y) and gridded as S i (x i ,y i )i(0, 1, 2, 3...n...m);

[0031] S2: After the sample is meshed, the surface density of each mesh module is expressed as

[0032] S3: The chuck clamps the sample for testing;

[0033] S4: The 3D sensing device collects the 3D image of the overhanging part and establishes a 3D model of the space;

[0034] S5: setting an x-axis, wherein the x-axis direction coincides with the bending line of the sample;

[0035] S6: The area of ​​the vertical part is recorded as

[0036] S7: The grid module density of the overhang is expressed as

[0037] S8: The mass of the overhang is

[0038] S9: The center of gravity of the overhang is G(x0, y0, z0);

[0039]

[0040]

[0041]

[0042] S10: Let the angle θ between the center of gravity G and the plane passing through the x-axis and y-axis be the size of the center of gravity offset angle, and the size of θ is expressed as

[0043] The beneficial effects of the present invention are as follows: compared with other fabric softness testers, the present invention has the advantages of being able to test various single-layer materials and having simple sample preparation steps. The present invention designs a set of softness testing devices that conform to its own design ideas, and the calculation principles and calculation basis used are different from those of common softness testers. The present invention combines a three-dimensional sensing device and uses image processing to display the test process in a digital manner, making the test results more convincing and correct, and has the advantages of being simple and convenient, and having accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a top view of the fabric softness device;

[0045] Figure 2 Fabric softness device Figure 1 AA cross-sectional view;

[0046] Figure 3 Schematic diagram of fabric softness index. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0048] like Figure 1 He Ru Figure 2 As shown: A fabric softness testing device, comprising two clamps 2, an adjustable light source 6, a vacuum cover 5, a vacuum high-pressure blower 4, and a three-dimensional sensing device 3;

[0049] The two chucks 2 are relatively horizontally arranged in the vacuum cover 5, and one end of the chuck 2 is connected to the power device through a telescopic rod 7;

[0050] The adjustable light source 6 is mounted on the vacuum cover 5 , and the axial direction and position of the adjustable light source 6 coincide with the center lines of the two chucks 2 ;

[0051] A vacuum high-pressure blower 4 is provided in the vacuum cover 5 , and a three-dimensional sensing device 3 is provided on either side of each chuck 2 .

[0052] The vacuum high-pressure blower 4 is used to remove the air in the device when the vacuum cover 5 is closed, so that the air pressure in the device drops below 0 Pa, so as to prevent the fabric from being affected by air resistance when falling, resulting in inaccurate results;

[0053] The three-dimensional sensing device 3 facilitates timely scanning to obtain a correct three-dimensional image.

[0054] A working method of a fabric softness testing device comprises the following steps:

[0055] Step 1: Select the sample to be tested, select the size S of the sample to be tested, cut the sample to be tested into the size S, S = 20mm * 130mm, clamp the two ends of the sample to be tested between two clamps, and keep the fabric horizontal and natural length;

[0056] Step 2: Adjust the brightness of the adjustable light source to ensure that the image captured by the 3D sensing device is clear;

[0057] Step 3: Close the vacuum cover to make it closed;

[0058] Step 4: Turn on the vacuum high-pressure blower to extract the air in the device, so that the air pressure in the device drops below 0Pa;

[0059] Step 5: Release the sample from any chuck and let it fall freely;

[0060] Step 6: The 3D sensing device captures the fabric at the falling angle to form a 3D image;

[0061] Step 7: Using the information of the three-dimensional image, a spatial model is established to extract the softness index;

[0062] Step 8: Assume that when the fabric is clamped as a horizontal plane, the midpoint of the clamp is point O, the clamped edge is the X-axis, the direction perpendicular to the clamped edge is the Y-axis, and the direction perpendicular to the horizontal plane is the Z-axis.

[0063] The center of gravity G is calculated by the computer based on the collected three-dimensional image data;

[0064] The line connecting the center of gravity G and point O and the straight line projected onto the XOY plane form an angle θ, which can be any angle less than the maximum bending angle;

[0065] Here, the angle θ is taken as 45°. When the angle θ is 45°, the center of gravity of the sample is G(x0, y0, z0). Assuming that the falling distance of the sample is h0=z0 and the falling time is t0, the specific calculation is:

[0066] S1: Tiled sample, denoted as S(x, y) and gridded as S i (x i ,y i )i(0, 1, 2, 3...n...m);

[0067] S2: After the sample is meshed, the surface density of each mesh module is expressed as

[0068] S3: The chuck clamps the sample for testing;

[0069] S4: The 3D sensing device collects the 3D image of the overhanging part and establishes a 3D model of the space;

[0070] S5: setting an x-axis, wherein the x-axis direction coincides with the bending line of the sample;

[0071] S6: The area of ​​the vertical part is recorded as

[0072] S7: The grid module density of the overhang is expressed as

[0073] S8: The mass of the overhang is

[0074] S9: The center of gravity of the overhang is G(x0, y0, z0);

[0075]

[0076]

[0077]

[0078] S10: Assume that when the fabric is clamped as a horizontal plane, the midpoint of the clamping head is point O, the clamped side is the X-axis, the direction perpendicular to the clamped side is the Y-axis, and the direction perpendicular to the horizontal plane is the Z-axis.

[0079] The center of gravity G is calculated by the computer based on the collected three-dimensional image data;

[0080] The line connecting the center of gravity G and point O and the straight line projected onto the XOY plane form an angle θ;

[0081] The size of the angle θ is expressed as When the center of gravity offset angle is 45°, The coordinates of the center of gravity are obtained as G(0.6077, 51.7202, 51.7236). At this time, the falling distance of the sample is h0 = z0 = 51.7236 mm, and the falling time is t0 = 0.23 s.

[0082] Step 9: Take the height of the fabric falling 0.001s before and 0.001s after t0 as h -0.001 、h +0.001 , that is, h -0.001 =z 0-0.001 =50.9367mm,h +0.001 =z 0+001 =52.5524mm, then the velocity v at time t0 01 Can be obtained

[0083] Take the height of the fabric falling at 0.002s before and after t0 as h -0.002 、h +0.002 , that is, h -0.002 =z 0-0.002 =50.1462mm,h +0.002 =z 0+0.002 =53.3892mm, then the velocity v at time t0 02 Can be obtained

[0084] The height of the fabric falling at 0.003s before and 0.003s after t0 is h -0.003 、h +0.003 , that is, h -0.003 =z 0-0.003 =49.3661mm,h +0.003 =z 0+0.003 =54.1624mm, then the velocity v at time t0 is 03 Can be obtained

[0085] Step 10: Due to v 01 With v 02 The values ​​are relatively close, so we take the average value, v0 = 0.8095 m / s;

[0086] Step 11: Substitute h0 and v0 into the formula using the law of conservation of energy:

[0087]

[0088] γ is the softness reference value, g is the gravity constant, v is the velocity, and (x, y, z) is the spatial coordinate point;

[0089] Step 12: Determine the softness of the sample based on the size of γ. A standard value C is set. If γ is greater than the standard value C, it means that the sample is very soft. If γ is less than the standard value C, it means that the sample is not very soft.

Claims

1. A method for operating a fabric softness testing device, characterized in that: The device comprises two clamps (2), an adjustable light source (6), a vacuum cover (5), a vacuum high-pressure blower (4), and a three-dimensional sensing device (3); The two clamps (2) are relatively horizontally arranged in the vacuum cover (5), and one end of the clamp (2) is connected to the power device through a telescopic rod (7); The adjustable light source (6) is installed on the top of the vacuum cover (5), and the lighting end of the adjustable light source (6) is located on the vacuum cover (5); A vacuum high-pressure blower (4) is provided in the vacuum cover (5), and the three-dimensional sensing device (3) is installed adjacent to each of the clamps (2), and the three-dimensional sensing device (3) is fixedly mounted on the side wall of the vacuum cover (5); Use the following steps, Step 1: Select the sample to be tested and set it to a standard size S; cut the sample to be tested into the standard size S, clamp the two ends of the sample to be tested between two clamps, and keep the fabric horizontal and natural length; Step 2: Adjust the brightness of the adjustable light source to ensure that the image captured by the 3D sensing device is clear; Step 3: Close the vacuum cover to make it closed; Step 4: Turn on the vacuum high-pressure blower to extract the air in the device, so that the air pressure in the device drops below 0Pa; Step 5: Release the sample from any chuck and let it fall freely; Step 6: The 3D sensing device captures the 3D shape of the fabric during its falling process and forms 3D image information; Step 7: Using the information of the three-dimensional image, a spatial model is established to extract the softness index; Step 8: Assume that when the fabric is clamped in a horizontal plane, the midpoint of the clamp is point O, the clamped edge is the X-axis, the direction perpendicular to the clamped edge is the Y-axis, and the direction perpendicular to the horizontal plane is the Z-axis; The center of gravity G is calculated by the computer based on the collected three-dimensional image data; The line connecting the center of gravity G and point O and the straight line projected onto the XOY plane form an angle θ; Assume that the coordinates of the center of gravity of the sample are G(x0, y0, z0), the falling distance of the sample is h0=z0, and the falling time is t0; Step 9: Take the height of the fabric falling 0.001s before and 0.001s after t0 as h -0.001 、h +0.001 , that is, h -0.001 =z 0-0.001 , h +0.001 =z 0+0.001 , then the velocity v at time t0 is 01 Can be obtained Take the height of the fabric falling at 0.002s before and after t0 as h -0.002 、h +0.002 , that is, h -0.002 =z 0-0.002 , h +0.002 =z 0+0.002 , then the velocity v at time t0 is 02 Can be obtained The height of the fabric falling at 0.003s before and 0.003s after t0 is h -0.003 、h +0.003 , that is, h -0.003 =z 0-0.003 , h +0.003 =z 0+0.003 , then the velocity v at time t0 is 03 Can be obtained Step 10: In v 01 、v 02 、v 03 Choose any two speeds and take the average value to get the speed v0 at t0; Step 11: Substitute h0 and v0 into the formula using the law of conservation of energy: γ is the softness reference value, g is the gravity constant, v is the velocity, and (x, y, z) is the spatial coordinate point; Step 12: Determine the softness of the sample based on the size of γ. A standard value C is set. If γ is greater than the standard value C, it means that the sample is very soft. If γ is less than the standard value C, it means that the sample is not very soft.

2. A method for operating the fabric softness testing device according to claim 1, characterized in that: The calculation formula of the center of gravity G(x0, y0, z0) in step 8 is: S1: Tiled sample, denoted as S(x, y) and gridded as S i (x i ,y i )i(0,1,2,33....n...m); S2: After the sample is meshed, the surface density of each mesh module is expressed as S3: The chuck clamps the sample for testing; S4: The 3D sensing device collects the 3D image of the overhanging part and establishes a 3D model of the space; S5: setting an x-axis, wherein the x-axis direction coincides with the bending line of the sample; S6: The area of ​​the vertical part is recorded as S7: The grid module density of the overhang is expressed as S8: The mass of the overhang is S9: The center of gravity of the overhang is G(x0, y0, z0); S10: Let the angle θ between the center of gravity G and the plane passing through the x-axis and y-axis be the size of the center of gravity offset angle, and the size of θ is expressed as 3. The method for testing the fabric softness according to claim 1, wherein: The angle θ is 15°, 30° or 45°.

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