Device and method for testing the resistance to unraveling of melt-bonded spandex fabric

Abstract

The application discloses a testing device and a testing method for preventing the disintegration of melt-spun spandex fiber fabric, and the testing device comprises an operation platform, a clamping device, a column-shaped telescopic rod and a pressure sensor connected with the column-shaped telescopic rod; the clamping device comprises a clamping disc, a clamping reed and a supporting arm; and the column-shaped telescopic rod is internally provided with a conical probe and a compression spring. In the fabric disintegration prevention testing method using the testing device, after the fabric is punctured, the column-shaped telescopic rod is kept static for 3-7 s every time the force value is increased by 5-15 cN, and if the fabric loop does not disintegrate, the testing is continuously carried out according to the step of keeping the column-shaped telescopic rod static for 3-7 s every time the force value is increased by 5-15 cN until the fabric loop disintegrates. The testing method combines the application performance characteristics of the melt-spun spandex fiber fabric with the action mechanism of the loop slippage and disintegration, is closer to the actual application scene compared with a traditional testing method, and testing data is very effective for judging the disintegration prevention effect of the melt-spun spandex fiber fabric.

Description

Technical Field

[0001] The invention relates to a test of the shedding performance of fabric, and in particular to a testing device and a testing method for the anti-shedding performance of melt-bonded spandex fiber fabric. Background Art

[0002] Melt-bonded spandex, also known as anti-shedding spandex, low-melting-point spandex, and low-temperature thermal bonding spandex, is a differentiated spandex fiber that has emerged in recent years. When heated, it melts and bonds fibers together, preventing further unraveling in damaged or torn fabrics. Melt-bonded spandex melts during the dyeing or heat-setting process, bonding spandex to one another or to other fibers. This creates strong bonds where the spandex filaments intertwine, resulting in knitted fabrics with excellent unraveling resistance.

[0003] Melt-bonded spandex fibers can be used in a variety of applications, primarily in weft-knitted fabrics. For example, for thin stockings, melt-bonded spandex and nylon filament are machine-wrapped to create a covered yarn. After being woven on a hosiery machine, the resulting stockings are resistant to scratching, heat-bonded, and unraveling. While holes in stockings made with standard spandex can easily expand due to unraveling of the loops, this is not the case with stockings made with low-melting-point spandex. This is because the adhesion points formed between the loops after heat setting effectively prevent unraveling and hole expansion, thus preventing unraveling and extending the fabric's lifespan. For example, circular knitted fabrics made with bare yarn can be used to produce custom-made fabrics. Traditional weft-knitted fabrics are prone to unraveling. When the yarn at the edge of the fabric is pulled, the entire edge will unravel in the opposite direction of the weave of the coil rows. Some fabrics even unravel in the same direction of the weave. Therefore, when making finished garments, sewing or binding is necessary. However, the use of free-cut fabrics containing low-melting-point spandex can effectively reduce this problem, improve sewing efficiency, and improve fabric quality and durability. Currently, the use of free-cut fabrics in high-end underwear and other fields is gradually increasing. The two-component Fusion spandex fiber produced by Lycra is a representative product of melt-bonded fiber and is widely used in high-end underwear, T-shirts, stockings and other products.

[0004] Ordinary spandex fibers lack adhesive properties and do not bond between fibers during the dyeing and finishing process. Therefore, fabrics containing ordinary spandex fibers are prone to unraveling or frayed edges after cutting or hooking. As a new type of functional stretch fabric, fabrics containing melt-bonded spandex fibers have anti-unraveling properties, and the quality of these properties has a significant impact on increasing product value and boosting consumer purchasing intent.

[0005] The current industry standard for testing the unraveling resistance of fabrics such as socks and stockings containing melt-bonded spandex fibers is FZ / T 73055-2016, "Unraveling-Resistant Socks." This standard targets socks that utilize special knitting structures or finishing processes to achieve unraveling resistance. The testing process involves constant force and constant speed stretching, and the unraveling resistance is determined by the unraveling length of the loops at the constant force. The method utilizes relatively common tensile testing equipment, making the experimental method relatively easy to implement. When a person wears clothing, the fabric is stretched in all four directions. Therefore, testing unraveling resistance requires subjecting the fabric to four-dimensional stretching. Testing in either the warp or weft direction alone cannot fully characterize the fabric's unraveling resistance. Comparative testing indicates that the 25N constant force test specified in the standard is not suitable for stockings containing melt-bonded spandex fibers. Firstly, the fabric can only be stretched in the warp or weft direction. Second, the 25N constant force test is essentially a destructive test. However, the linear density of melt-bonded spandex fibers is low, and the weight of stockings themselves is also low, so such a large tensile force is not required for testing. Combined with the stretching state of the fabric when worn on the human body, and the thin and light characteristics of stockings, the above standards are not suitable for stockings containing melt-bonded spandex fibers.

[0006] Currently, there is no formal testing standard for unraveling resistance in fabrics containing melt-bonded spandex fibers, such as high-end underwear and T-shirts. Some manufacturers use the national standard GB / T7742, "Burst Properties of Textile Fabrics," for unraveling resistance testing. This standard defines the bursting strength and burst expansion of fabrics and describes the test method. Whether hydraulic or pneumatic bursting is used, the standard requires the use of a diaphragm. The fabric's bursting pressure is calculated by subtracting the diaphragm bursting pressure from the total bursting pressure of the diaphragm and fabric. Fabric bursting resistance measures a fabric's ability to withstand pressure in all directions, including warp, weft, and diagonal. It reflects the fabric's resistance to bursting under high-intensity movement, friction, and tearing. It is suitable for testing woven fabrics, nonwovens, heavyweight knits, and laminated fabrics. Fabric unraveling refers to the ability of a knitted fabric to break and separate from the fabric, or the separation of loops after the loops lose their connection, leading to the fabric's disintegration. This is the opposite of a knitting process in which loops are interlocked. Therefore, the above standard is not applicable to testing the anti-shedding properties of light-weight, thin and transparent fabrics containing melt-bonded spandex fibers. Summary of the Invention

[0007] To address the shortcomings of existing fabric unraveling resistance testing devices and methods, the present invention provides a device and method for testing the unraveling resistance of melt-bonded spandex fiber fabrics. These devices can effectively assess the unraveling resistance of lightweight, thin, and transparent fabrics containing melt-bonded spandex fibers. Furthermore, the present testing device can also be used to assess the bursting and pressure sensitivity of fabrics, providing effective data reference for the application of melt-bonded spandex fibers in textile fabrics.

[0008] A test device for the anti - shedding performance of melt - bonded spandex fiber fabrics, characterized in that it includes an operation platform, a clamping device, a cylindrical telescopic rod and a pressure sensor connected to the cylindrical telescopic rod; the clamping device includes a clamping disc, a clamping reed and a support arm; a conical probe and a compression spring are arranged inside the cylindrical telescopic rod.

[0009] Further, the clamping disc is square, that is, in the shape of a "square", including a front clamping disc, a rear clamping disc, a left clamping disc and a right clamping disc. The 4 clamping discs are of the same size and material, with lengths of 7 - 15 cm respectively and widths of 1 - 3 cm respectively.

[0010] Further, clamping reeds are respectively installed on the front clamping disc, the rear clamping disc, the left clamping disc and the right clamping disc for clamping the fabric sample to be tested. The number of clamping reeds on each clamping disc is at least 1, and they are symmetrically arranged respectively.

[0011] Further, the height of the support arm from the operation platform is 8 - 12 cm. The support arm is fixed on the operation platform to support the clamping disc.

[0012] Further, the lower part of the cylindrical telescopic rod is cylindrical, with a diameter range of 2 - 4 cm. The top of the cylindrical telescopic rod is in a semi - circular arc shape, and the central angle of the semi - circular arc is 180°. The semi - circular arc is of an open - and - close type and is in a closed state during the normal test process.

[0013] Further, the conical probe is a combined structure of a cone and a cylinder, divided into a conical probe cone module and a conical probe cylinder module. The cone angle is 30 - 45°, and the cone height is 5 - 10 mm. The cylinder diameter is 2.68 - 8.28 mm, and the cylinder height is 3.5 - 4.5 cm. When a puncturing action is required, the semi - circular arc at the top of the cylindrical telescopic rod opens, the conical probe rises to puncture the fabric, the semi - circular arc closes, and then the conical probe descends to the initial position.

[0014] Further, the compression spring is connected to the conical probe cylinder module. In the initial position, the compression spring is in a compressed state; when it is necessary to puncture the fabric, the compression spring releases, and the conical probe rises, thereby puncturing the fabric.

[0015] Further, the pressure sensing module is located inside the operation platform and is used to receive the pressure exerted by the fabric sample on the cylindrical telescopic rod. The range of the pressure sensor is 10 - 50 N.

[0016] In this test device, the operation platform is connected to a PLC control system, which can control the rising and falling of the cylindrical telescopic rod and the conical probe, as well as the opening and closing of the open - and - close type semi - circular arc at the top of the cylindrical telescopic rod.

[0017] A method for testing the anti-shedding property of the melt-bonded spandex fiber fabric anti-shedding property testing device is characterized by comprising the following steps:

[0018] (1) Place the melt-bonded spandex fabric to be tested into a clamping plate and secure it with a clamping reed;

[0019] (2) Adjust the position of the telescopic column so that the top of the telescopic column is in contact with the fabric but without pressure;

[0020] (3) Set the rising and falling speeds of the cylindrical telescopic rod and the conical probe on the operating platform, and then start the test;

[0021] (4) When the force value of the pressure sensor reaches 20-50 cN, the cylindrical telescopic rod stops rising; at this time, the conical probe starts to rise and pierce the fabric, then descends and returns to the inside of the cylindrical telescopic rod;

[0022] (5) The column telescopic rod continues to rise, and the force value is used as a unit at this time; that is, the column telescopic rod is stationary for 3-7 seconds for every 5-15 cN increase in force. If the fabric coil does not become loose, continue to test according to the steps of increasing the force value by 5-15 cN and the column telescopic rod being stationary for 3-7 seconds until the fabric coil becomes loose;

[0023] (6) The pressure sensor records the final test force value; after the column telescopic rod returns to its initial position,

[0024] Use a ruler to measure the unraveled length of the fabric.

[0025] In this test method, the melt-bonded spandex fiber fabric to be tested needs to be placed in a constant temperature and humidity environment for 8 hours to ensure the stability of the sample to be tested and make the test results more accurate.

[0026] This test method evaluates the results based on the force. If the force values ​​are the same, the evaluation is based on the unraveling length. The greater the force at which the sample unravels, the shorter the unraveling length, indicating that the sample has better anti-unraveling properties.

[0027] In step (1), the fabric is clamped on the reed to ensure that the sample is flat and wrinkle-free. At least three fabric samples of the same brand or model should be prepared. Preparing multiple fabric samples for parallel testing can ensure the accuracy of the test results.

[0028] In step (3), the rising speed of the columnar telescopic rod is 80-100 mm / min.

[0029] When the fabric is punctured, the rising speed of the cylindrical telescopic rod is adjusted to 15-30mm / min. The slow rising speed is conducive to observing the length and direction of the fabric unraveling, and it is also convenient for recording the force value at a certain unraveling length.

[0030] After the fabric is untied, the descending speed of the column telescopic rod is 80-100mm / min.

[0031] The rising and falling speeds of the tapered probe are 50-70 mm / min, and the rising and falling speeds are the same.

[0032] In step (4), when the force value of the pressure sensor reaches 20-50 cN, the cylindrical telescopic rod stops rising. The force value setting here is determined on the one hand based on the fact that the elongation of the fabric when worn is generally in the range of 30%-50%, that is, the tensile force required to stretch the fabric to 30%-50% is approximately 20-50 cN. On the other hand, it is related to the gram weight, weaving structure and spandex content of the fabric itself. Normally, the greater the gram weight of the fabric, the greater the warp and weft density per unit area of ​​the fabric. When stretching the fabric to the same length, the force value required for a heavy fabric is of course greater than that for a light fabric. For weft knitted fabrics, the basic principles of weaving structure are horizontal coil extension and vertical coil interlacing. When we say here that the force value is related to the weaving structure, it should be said that it is the weaving yarn, not the weaving structure. The weaving yarn can be the same in adjacent paths or the same every other path, which needs to be designed according to different applications of the fabric. If the spandex fiber is woven in every path during the weaving process of the fabric, the ammonia content must be greater than that of the fabric woven in every other path. This means that when stretching these two fabrics, the fabric with a higher ammonia content will inevitably experience greater tension. The maximum force value of the pressure sensor is 50 cN. If the force is too high, the cylindrical telescopic rod will exert greater pressure on the fabric, causing significant deformation. If the force is less than 20 cN, the fabric will experience less tensile deformation. Due to the elastic retraction of spandex, the coils will be tightly packed and stacked, failing to reflect the stretched deformation of the fabric during normal wear.

[0033] The conical probe extends at a speed of 50-70 mm / min, piercing the stocking and continuing to rise until the conical tip of the probe is 4-5.5 cm above the hole in the stocking (i.e., the cylindrical module of the probe also penetrates the fabric a certain distance). The conical probe then stops rising and descends to its initial position at a speed of 50-70 mm / min. This step simulates the state of stockings when worn by the human body, that is, under a certain pressure, the stockings are hooked or pulled by external forces, causing holes.

[0034] In step (5), the cylindrical telescopic rod is stationary for 3-7 seconds, at which time the fabric is stretched and elongated on all four sides. The part where the cylindrical telescopic rod contacts the fabric has the greatest pressure and the greatest deformation, which is equivalent to the closer to the top of the cylindrical telescopic rod, the greater the stretching deformation, and the most serious deformation of the coil. Since the weaving of the fabric is a mutual intertwining of the coils, when the pressure increases, the coils will move and misalign. Due to the mutual friction and constraints between the yarns, the coils cannot reach a relatively stable position in time. Therefore, the cylindrical telescopic rod needs to be stationary for 5-7 seconds to provide the coils with sufficient time to return to a stable position. On the other hand, it can also be used to simulate the situation when the fabric is in a certain pressure state when worn by the human body. At the same time, the human eye is given a certain amount of time to observe the coil disengagement state, and the pressure sensor can fully record the changes in force value when the fabric coil disengages during this time period.

[0035] In step (6), when measuring the unraveling length of the fabric, the fabric does not need to be removed from the clamping plate.

[0036] The above-mentioned testing device can also be used to test the pressure-sensitive properties of melt-bonded spandex fiber fabrics, comprising the following steps:

[0037] (1) Place the melt-bonded spandex fabric to be tested into a clamping plate and secure it with a clamping reed;

[0038] (2) Adjust the position of the telescopic column so that the top of the telescopic column is in contact with the fabric but without pressure;

[0039] (3) Set the rising speed, falling speed and rising height of the telescopic column on the operating platform, and then start the test;

[0040] (4) According to the test method of constant elongation, set up three stretching-recovery cycle steps. Record the tensile force when the cylindrical telescopic rod rises to 20mm, 40mm, 60mm or 30mm, 50mm, 70mm or 50mm, 70mm, 90mm and the tensile force when it falls to 20mm,

[0041] 40mm, 60mm or 30mm, 50mm, 70mm or 50mm, 70mm, 90mm

[0042] The restoring force at each position is calculated, and the average force value at each position is calculated. If the tensile force value is small, the stockings can be stretched easily and are easy to wear; if the restoring force value is large, the stockings fit the human body well.

[0043] Therefore, the smaller the tensile force value and the larger the recovery force value, the better the pressure sensitivity performance.

[0044] In step (4), the height of the rise and fall simulates the different stretching states of stockings worn by people of different body proportions, or the stretching degree of stockings when the human body is in different motion states. It can also be changed according to the spandex content or weaving structure of the fabric.

[0045] The above-mentioned testing device can also be used to test the bursting performance of melt-bonded spandex fiber fabrics, comprising the following steps:

[0046] (1) Place the melt-bonded spandex fabric to be tested into a clamping plate and secure it with a clamping reed;

[0047] (2) Adjust the position of the telescopic column so that the top of the telescopic column is in contact with the fabric but without pressure;

[0048] (3) Set the rising and falling speeds of the telescopic rod on the operating platform and start the test;

[0049] (4) According to the breaking strength test method, record the force value when the stockings burst and the elongation value of the cylindrical telescopic rod. The greater the force value and elongation value, the better the fabric's bursting performance.

[0050] Beneficial effects:

[0051] This invention uses a cylindrical telescopic rod as a testing element, ensuring that the stress-bearing area of ​​the fabric remains stable and unmoved. A pressure sensor connected to the rod precisely controls the tensile and restorative forces of the fabric. A conical probe within the rod automatically extends and retracts as needed, ensuring safe fabric testing.

[0052] In the anti-shedding property test method adopted by the present invention, the force value is used as the unit after the fabric is punctured.

[0053] Each time the force increases by 5-15 cN, the telescopic rod is at rest for 3-7 seconds. If the fabric coils do not become loose, continue testing by increasing the force by 5-15 cN and keeping the telescopic rod at rest for 3-7 seconds until the fabric coils become loose. The telescopic rod is at rest for a period of time, which can keep the fabric at rest in a certain pressure state.

[0054] Under this condition, the coils in the fabric are given a certain time to react to the loosening; at the same time, the human eye has a certain time to observe the loosening state of the fabric. The pressure sensor can fully record the change in the force value when the fabric coils are loosened during this period of time. This test method combines the application performance characteristics of melt-bonded spandex fiber fabrics with coil slippage,

[0055] Compared with traditional industry standard testing methods, the unraveling mechanism is closer to actual application scenarios. The test data is very effective in evaluating the anti-unraveling effect of melt-bonded spandex fiber fabrics. It is particularly suitable for melt-bonded spandex fiber fabrics such as light-weight, thin and transparent stockings, socks, high-end underwear, T-shirts, etc.

[0056] The testing device of the present invention can also be used to test the pressure sensitivity and bursting performance of melt-bonded spandex fiber fabrics. The testing program and test parameters can be set by the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a schematic structural diagram of a device for testing the anti-shedding properties of melt-bonded spandex fiber fabrics according to the present invention;

[0058] Figure 2 Schematic diagram of the structure of the cylindrical telescopic rod and the conical probe.

[0059] Description of reference numerals:

[0060] Clamping disc 101, clamping reed 102, support arm 103, cylindrical telescopic rod 104, operating platform 105, pressure sensor 106, opening and closing semicircular arc top 201, conical probe conical module 202, conical probe cylindrical module 203, compression spring 204, conical probe 205. DETAILED DESCRIPTION

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the following text will further clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. For the sake of clarity and conciseness, not all features of the actual implementation are described in this specification. However, it should be understood that in the process of developing any such actual embodiment, many implementation-specific decisions must be made to achieve the specific goals of the developers.

[0062] It is also necessary to explain here that the elements and features described in one figure or one embodiment of the present invention can be combined with the elements and features shown in one or more other figures or embodiments. In order to avoid obscuring the present invention due to unnecessary details, only the device structures closely related to the solutions according to the present invention are described in the figures and descriptions. In order to more clearly show the structure of the device described in the present invention, some structures are omitted in the figures to highlight the characteristic structures of important parts.

[0063] Example 1

[0064] The present invention relates to a testing device for the anti-shedding property of melt-bonded spandex fiber fabrics, and its structural schematic diagram is shown as follows: Figure 1 and Figure 2 shown.

[0065] A test device for the anti - shedding property of melt - bonded spandex fiber fabric, including a clamping disc 101, a clamping reed 102, a support arm 103, a cylindrical telescopic rod 104, an operation platform 105, a pressure sensor 106, an open - close semi - circular top 201, a conical probe conical module 202, a conical probe cylindrical module 203, a compression spring 204, and a conical probe 205.

[0066] The clamping disc 101 is square, that is, in the shape of a "square frame", including a front clamping disc, a rear clamping disc, a left clamping disc, and a right clamping disc. The 4 clamping discs have the same size and material, with a length of 10 cm and a width of 2 cm respectively; and 2 clamping reeds 102 are respectively installed on the 4 clamping discs. The clamping reeds 102 are symmetrically arranged and are used to clamp the fabric sample to be tested, keeping the sample flat and without wrinkles.

[0067] The support arm 103 is 10 cm above the operation platform 105. The support arm 103 is fixed on the operation platform 105 and is used to support the clamping disc 101.

[0068] The cylindrical telescopic rod 104 is located directly below the clamping disc 101. The lower part of the cylindrical telescopic rod 104 is cylindrical, with a diameter of 3 cm; the upper part is an open - close semi - circular top 201, and the central angle of the semi - circle is 180°. The semi - circle is open - close and is in the closed state during the normal test process; when it is necessary to pierce the fabric, the semi - circle opens.

[0069] The conical probe 205 is a combined structure of a cone and a cylinder, divided into a conical probe conical module 202 and a conical probe cylindrical module 203. The cone angle is 30°, and the cone height is 5 mm. The cylinder diameter is 2.68 mm, and the cylinder height is 4 cm. When a piercing action is required, the open - close semi - circular top 201 on the upper part of the cylindrical telescopic rod 104 opens, the conical probe 205 rises to pierce the fabric. After the conical probe conical module 202 rises to a certain height, the open - close semi - circular top 201 closes, and then the conical probe 205 descends to the initial position.

[0070] The compression spring 204 is connected to the conical probe cylindrical module 203. In the initial position, the compression spring 204 is in a compressed state; when it is necessary to pierce the fabric, the compression spring 204 releases, and the conical probe 205 rises, thus piercing the fabric.

[0071] The pressure sensor 106 is located inside the operation platform 105. The range of the pressure sensor is 50 N, and it is connected to the cylindrical telescopic rod 104, and is used to receive the pressure exerted by the fabric sample on the cylindrical telescopic rod and measure the force value of fabric shedding.

[0072] The testing device can not only be used to measure the anti-shedding property of melt-bonded spandex fiber fabrics, but also to measure the pressure-sensitive property and bursting property of fabrics.

[0073] Example 2

[0074] This embodiment 2 relates to a method for testing the anti-shedding property of a melt-bonded spandex fiber fabric. The anti-shedding property of the melt-bonded spandex fiber fabric is tested using the testing device in embodiment 1. The specific steps are as follows:

[0075] (1) Take the melt-bonded spandex stockings A to be tested and place them in a constant temperature and humidity environment for 8 hours. Then use scissors to cut the stockings into samples with a size of 15 cm long * 15 cm wide. Place them in the clamping plate 101. At this time, the clamping area of ​​the clamping plate 101 is 10 cm long * 10 cm wide. Secure it with a clamping reed 102.

[0076] (2) Adjust the position of the cylindrical telescopic rod 104 so that the top of the cylindrical telescopic rod 104 is in contact with the stocking A sample without pressure;

[0077] (3) Set the rising speed of the cylindrical telescopic rod 104 on the operating platform 105 to 90 mm / min,

[0078] The rising speed and the descending speed of the tapered probe 205 are 20 mm / min and 90 mm / min respectively, and then the test is started;

[0079] (4) When the force value displayed by the pressure sensor 106 reaches 30 cN, the cylindrical telescopic rod 104 stops rising. At this time, the retractable semicircular top 201 is opened and the conical probe 205 is started to

[0080] The speed of 60mm / min rises to pierce the stocking A until the cone module of the cone probe 104

[0081] 202 is 3.5 cm vertically away from the hole in stocking A, then descends at a speed of 60 mm / min and returns to the inside of the cylindrical telescopic rod 104, closing the retractable semicircular top 201;

[0082] (5) The columnar telescopic rod 104 continues to rise at a speed of 20 mm / min.

[0083] That is, for every 10 cN increase in force, the telescopic rod 104 remains stationary for 5 seconds. If the stocking A coil does not become untied, continue testing by increasing the force by 10 cN and keeping the telescopic rod 104 stationary for 5 seconds until the stocking A coil becomes untied. Then, stop the test and lower the telescopic rod 104 to its initial position at a speed of 90 mm / min.

[0084] (6) The pressure sensor 106 records the final test force value. After the cylindrical telescopic rod 104 returns to its initial position, the fabric is still fixed in the clamping plate 101. Use a ruler to measure the untied length of stocking A and record it. Then take 4 groups of stocking A samples, namely A2 / A3 / A4 / A5, 5 groups of stocking B samples and 5 groups of stocking C samples, namely B1 / B2 / B3 / B4 / B5 / ,

[0085] C1 / C2 / C3 / C4 / C5, where sample A weighs 35g, sample B weighs 32g, and sample C weighs 36g. Stockings A, B, and C are from different brands and all contain melt-bonded spandex fibers. Parallel testing was performed using the above test method, and the averaged results were calculated. Table 1 shows the evaluation results. The force values ​​were used to determine the evaluation results. If the force values ​​were the same, the unraveling length was used for evaluation. The greater the unraveling force value and the shorter the unraveling length, the better the unraveling resistance of the sample.

[0086] Table 1 Test results of anti-shedding properties of stockings A / B / C samples

[0087]

[0088]

[0089] The unraveling force and unraveling length values ​​for the three samples are shown in the table above. As can be seen from the data, Sample A has the highest unraveling force and the shortest unraveling length, while Sample B has the lowest unraveling force and the longest unraveling length, indicating that Sample A has the best unraveling resistance, Sample B has the worst, and Sample C falls between A and B. This also demonstrates that the melt-bonded spandex in Sample A exhibits superior melt-bonding performance compared to Samples B and C, capable of withstanding high tension and snagging without unraveling or with minimal unraveling. Samples A, B, and C were simultaneously sent to three different manufacturers for evaluation of their melt-bonding performance. Feedback from these three manufacturers confirmed consistent trends with laboratory test data: Sample A exhibited excellent unraveling resistance, Sample B exhibited little to no resistance, and Sample C was average. This method effectively tests the unraveling resistance of three different samples on the market, allowing for feasibility assessment of the true melt-bonding performance of melt-bonded spandex from different manufacturers.

Claims

1. A device for testing the anti-shedding properties of melt-bonded spandex fiber fabrics, characterized by: The device comprises an operating platform, a clamping device, a cylindrical telescopic rod, and a pressure sensor connected to the cylindrical telescopic rod; the clamping device comprises a clamping plate, a clamping reed, and a support arm; a conical probe and a compression spring are provided inside the cylindrical telescopic rod; the top of the cylindrical telescopic rod is semicircular, with a central angle of 180°, and the semicircle is open and closeable; The cylindrical telescopic rod is in an ascending state at the beginning of the test. When the pressure sensor force value reaches 20-50 cN, the cylindrical telescopic rod stops ascending. At this time, the conical probe is activated to ascend and pierce the fabric, then descend and return to the inside of the cylindrical telescopic rod. Finally, after the conical probe returns to the interior of the cylindrical telescopic rod, the cylindrical telescopic rod continues to rise until the fabric coils become untied.

2. The device for testing the anti-shedding property of melt-bonded spandex fiber fabric according to claim 1, characterized in that: The tapered probe is a combined structure of a cone and a cylinder, and is divided into a tapered probe cone module and a tapered probe cylinder module.

3. The testing method of the testing device according to any one of claims 1 to 2, characterized in that: The steps include: (1) Place the melt-bonded spandex fabric to be tested into the clamping plate and fix it with a clamping reed; (2) Adjust the position of the telescopic column so that the top of the telescopic column is in contact with the fabric but without pressure; (3) Set the rising and falling speeds of the cylindrical telescopic rod and the conical probe on the operating platform, and then start the test; (4) When the force value of the pressure sensor reaches 20-50 cN, the cylindrical telescopic rod stops rising; at this time, the conical probe starts to rise and pierce the fabric, then descends and returns to the inside of the cylindrical telescopic rod; (5) The cylindrical telescopic rod continues to rise, and the force value is used as the unit at this time; that is, the cylindrical telescopic rod remains stationary for 3-7 seconds for every 5-15 cN increase in force. If the fabric coil does not become loose, continue to test according to the steps of increasing the force value by 5-15 cN and the cylindrical telescopic rod remaining stationary for 3-7 seconds until the fabric coil becomes loose; (6) The pressure sensor records the final test force value; after the cylindrical telescopic rod returns to its initial position, the unraveling length of the fabric is measured with a ruler.

4. The testing method according to claim 3, wherein: The rising speed of the cylindrical telescopic rod is 80-100 mm / min and 15-30 mm / min, and the descending speed is 80-100 mm / min.

5. The testing method according to claim 3, wherein: The rising speed and the falling speed of the tapered probe are 50-70 mm / min, and the rising speed and the falling speed are the same.

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