Quality evaluation method and system for sock textile wrap yarn

Abstract

The invention relates to the technical field of quality evaluation of sock textile wrap yarns, in particular to a quality evaluation method and system for sock textile wrap yarns. The method comprises the following steps: firstly, obtaining samples of sock textile wrap yarns with different lengths in the same batch; then respectively performing dynamic friction and durability evaluation, compression and fitness evaluation and coating layer anti-shedding evaluation on each test sample with different lengths, and calculating a durability evaluation index, a fitness evaluation index and a stability evaluation index of the covered yarn sample of the batch; and finally, integrating the three indexes, evaluating the comprehensive quality index of the sock textile wrap yarn in the batch, and judging whether the quality of the sock textile wrap yarn in the batch is qualified or not. According to the method, aiming at the special quality requirements of the wrap yarn for sock spinning, the quality performance of the wrap yarn sample under the actual wearing condition is comprehensively evaluated through sample multi-angle simulation testing, and the comprehensiveness and the accuracy of the quality evaluation of the wrap yarn for sock spinning are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of quality assessment of textile covered yarns for hosiery products, and in particular to a quality assessment method and system for textile covered yarns for hosiery products. Background Art

[0002] Covered yarn is a special yarn composed of inner core yarn and outer fiber. The thin outer fiber is wrapped around the thick inner core yarn, and the surface of the yarn is covered with a functional film. This film is the key to the characteristics of good air permeability, good elasticity, antibacterial and antistatic of the covered yarn, which makes the textiles based on the covered yarn usually have high comfort. The outer fiber of the covered yarn is usually composed of natural fiber or other functional fiber, which provides skin-friendliness and comfort; while the inner core yarn is usually composed of tougher fiber, which provides stability and durability; the inner core yarn and outer fiber make the covered yarn show excellent comfort, good air permeability and certain antibacterial and deodorizing effects, and it is widely used in the production and manufacturing of sportswear and close-fitting textiles.

[0003] However, due to the different wearing positions, the quality requirements of coated yarn in hosiery textiles and underwear textiles are different. For example, although the elasticity and comfort of coated yarn are good, in the scenario of long-term wearing and severe friction of socks, the toughness requirements of the inner core yarn of the coated yarn are higher than that of underwear textiles; in addition, the user's standing and movement behavior also put forward higher requirements for the fit of socks, that is, the outer fiber of the coated yarn needs higher support. In summary, although they are both clothing textile materials, due to the particularity of the wearing scene, the quality assessment requirements of sock textile coated yarn and underwear textile coated yarn are different. The current general yarn quality assessment method usually focuses on the basic physical properties of the yarn, such as strength, uniformity and appearance. The strength test is usually instantaneous strength and short-term friction, and does not consider the quality changes of socks under long-term high-intensity friction and pressure; and the test of the uniformity of the coating layer is also difficult to effectively evaluate the shedding or damage of the coating layer of the coated yarn in the high-intensity friction scene. Therefore, the existing yarn quality assessment method is not suitable for the quality assessment of hosiery textile covered yarn and cannot meet the quality assessment needs of hosiery textile covered yarn.

[0004] In order to provide a systematic comprehensive evaluation method for the quality of hosiery textile covered yarns and improve the accuracy and comprehensiveness of the quality evaluation of hosiery textile covered yarns, the present invention proposes a quality evaluation method and system for hosiery textile covered yarns. Summary of the invention

[0005] The purpose of the present invention is to provide a quality assessment method and system for covered yarns used in hosiery textiles. According to the special quality requirements of covered yarns used in hosiery textiles, through multi-angle simulation tests of divided samples, the quality performance of covered yarn samples under long-term high-intensity friction and trampling conditions is comprehensively evaluated, thereby improving the comprehensiveness and accuracy of the quality assessment of covered yarns used in hosiery textiles.

[0006] To achieve the above object, the present invention provides a quality assessment method for hosiery textile covered yarn, comprising: Obtain samples of the same production batch of hosiery textile covered yarns, and divide the samples into a first test sample, a second test sample, and a third test sample; and divide each group of test samples into a first test length, a second test length, and a third test length; Applying dynamic friction to the first test sample, obtaining the strength change of the first test sample under continuous friction, using a target detection algorithm to obtain the fracture condition of the first test sample, and calculating the durability evaluation index of the coated yarn; Apply periodic compression to the second test sample, obtain the recovery degree and rebound condition of the second test sample during the dynamic compression process through an image processing algorithm, and calculate the fitting evaluation index of the coated yarn; The coating resistance of the third test sample is evaluated, the exposed area of ​​the inner core yarn of the third test sample is obtained by a contour detection method, and the stability evaluation index of the coated yarn is calculated; The comprehensive quality index of the covered yarn samples of different test lengths is calculated by combining the durability evaluation index, fit evaluation index and stability evaluation index; the comprehensive quality index is compared with the quality threshold to determine whether the quality of the sample is qualified.

[0007] Furthermore, the process of obtaining the durability evaluation index includes: Set the friction force, friction frequency and friction cycle of the friction test, apply friction to the first test sample; record the strength change of the first test sample and calculate the strength change rate ; Use the target detection algorithm to obtain the number of fractures of the first test sample after a friction cycle and calculate the loss rate of the first test sample ; By formula Calculation of durability evaluation index ;in, and is a constant coefficient, and As parameters, for right The nonlinear impact factor.

[0008] Furthermore, the process of obtaining the fit evaluation index includes: Set the pressure, dynamic frequency, compression amplitude and compression cycle of the compression test, and apply pressure to the second test sample; measure the rebound rate of the second test sample during dynamic compression through image processing algorithm Rebound rate ; After a compression cycle, record the number of samples whose deformation amplitude after compression exceeds the threshold, and calculate the deformation rate of the second test sample ; By formula Calculate fit evaluation index ;in, and is the weight coefficient, satisfying ; and They are , and The nonlinear index.

[0009] Furthermore, the steps of obtaining the stability evaluation index include: The friction force, tension force, frequency and force application cycle of the friction and tension comprehensive test are set, and the friction force and tension force are applied to the third test sample comprehensively; the exposed area of ​​the inner core wire of the third test sample after one force application cycle is extracted by the contour detection method, and the shedding rate of the coating layer of the third test sample is calculated ; In one force application cycle, the coating shedding rate of the third test sample is calculated several times, and the coating shedding rate of the third test sample is calculated ; pass Calculation of stability evaluation indicators ;in, and They are and The weight coefficient satisfies .

[0010] Furthermore, the calculation process of the comprehensive quality index of the covered yarn sample includes: for the first test sample, the second test sample and the third test sample of the same length, the comprehensive quality index is calculated by comprehensively considering the durability evaluation index, the fit evaluation index and the stability evaluation index; the calculation formula of the comprehensive quality index is: ; in, For the The test length corresponds to the comprehensive quality index of the sample, and Respectively The test length corresponds to the durability evaluation index, fit evaluation index and stability evaluation index of the sample; and They are and The weight coefficient satisfies ; Different quality thresholds are set for samples of different lengths, and the quality of the samples is judged based on the comparison between the comprehensive quality index of the samples and the quality thresholds.

[0011] A quality assessment system for hosiery textile covered yarn is also proposed, comprising: Sample acquisition unit: used to acquire samples of the same production batch of hosiery textile covered yarns, and divide the samples into first test samples, second test samples and third test samples; each group of test samples is divided into first test length, second test length and third test length; Durability evaluation unit: used for applying dynamic friction to the first test sample, obtaining the strength change of the first test sample under continuous friction, obtaining the fracture condition of the first test sample by using a target detection algorithm, and calculating the durability evaluation index of the coated yarn; Fitting evaluation unit: used to evaluate the coating resistance of the third test sample, obtain the exposed area of ​​the inner core yarn of the third test sample by the contour detection method, and calculate the stability evaluation index of the coated yarn; Stability evaluation unit: used to evaluate the anti-shedding property of the coating layer of the third test sample, obtain the exposed area of ​​the inner core yarn of the third test sample by the contour detection method, and calculate the stability evaluation index of the coated yarn; Comprehensive quality assessment unit: used to comprehensively evaluate durability, fit and stability, calculate the comprehensive quality index of covered yarn samples of different test lengths; compare the comprehensive quality index with the quality threshold to determine whether the quality of the sample is qualified.

[0012] The process of obtaining the durability evaluation index through the durability evaluation unit includes: The friction force, friction frequency and friction cycle of the friction test are set, and friction is applied to the first test sample; the strength change of the first test sample is recorded and the strength change rate is calculated; the target detection algorithm is used to obtain the number of fractures of the first test sample after one friction cycle, and the loss rate of the first test sample is calculated; the durability evaluation index is calculated by comprehensively considering the strength change rate and the loss rate.

[0013] The process of obtaining the fit evaluation index through the fit evaluation unit includes: The pressure, dynamic frequency, compression amplitude and compression cycle of the compression test are set, and pressure is applied to the second test sample; the rebound rate and rebound velocity of the second test sample during the dynamic compression process are measured through an image processing algorithm; the number of samples of the second test sample whose deformation amplitude after compression exceeds the threshold after a compression cycle is recorded, and the deformation rate of the second test sample is calculated; the fit evaluation index is calculated by comprehensively considering the rebound rate, rebound velocity and deformation rate.

[0014] The steps of obtaining the stability evaluation index through the stability evaluation unit include: The friction force, tension, frequency and force application cycle of the comprehensive friction and tension test are set, and the friction and tension comprehensive testing machine is used to comprehensively apply friction and tension to the third test sample; the exposed area of ​​the inner core wire of the third test sample after one force application cycle is extracted by a contour detection method, and the coating shedding rate of the third test sample is calculated; within one force application cycle, the coating shedding rate of the third test sample is calculated several times, and the coating shedding rate of the third test sample is calculated; the stability evaluation index is calculated by comprehensively calculating the coating shedding rate and the coating shedding rate.

[0015] The process of obtaining the comprehensive quality index of the covered yarn sample through the comprehensive quality evaluation unit includes: For the first test sample, the second test sample and the third test sample of the same length, the comprehensive quality index is calculated by comprehensively considering the durability evaluation index, the fit evaluation index and the stability evaluation index; Different quality thresholds are set for samples of different lengths, and the quality of the samples is judged based on the comparison between the comprehensive quality index of the samples and the quality thresholds.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention first simulates the daily wearing intensity of coated yarn textile socks except for high-intensity exercise, and evaluates the durability and fit of the coated yarn by applying dynamic friction and dynamic compression to the coated yarn. In the evaluation of durability and fit, the parameters of dynamic friction and compression are not in a linear relationship with the strength change and deformation of the coated yarn, that is, with the continuous application of friction and compression, the strength and resilience of the coated yarn actually decrease at a non-uniform rate. In order to accurately describe this nonlinear relationship, this method introduces nonlinear influencing factors in the calculation process of durability and fit evaluation indicators, so as to better reflect the strength change and deformation of the coated yarn under long-term high friction and pressure conditions. The obtained durability and fit evaluation indicators also provide a modular theoretical and technical basis for the comprehensive quality evaluation of textile coated yarns for socks.

[0017] 2. In order to simulate the structural stability of the coated yarn of socks during exercise, especially in running and jumping, the present invention adopts a comprehensive test method of friction and tension. By applying periodic friction and tension at the same time, the exposed area of ​​the inner core wire in the coated yarn is detected and the shedding rate and shedding speed of the coating are calculated; not only the strength and toughness of the inner core wire of the coated yarn are detected, but also the stability of the outer fiber coating under multiple intensity friction is paid attention to. After the coated yarn with unqualified stability is made into socks, the outer fiber will fall off quickly under the combined action of high-intensity friction and tension, causing the socks to lose their original breathability and comfort; this method proposes to evaluate the stability of the coated yarn, and the stability evaluation index obtained provides a new dimension for improving the accuracy of the comprehensive quality evaluation of the textile coated yarn of socks.

[0018] 3. The present invention aims at the difference in quality requirements for covered yarns between hosiery textiles and underwear textiles, and takes into account the particularity of hosiery wearing scenarios. From the durability and fit of the covered yarns under daily wearing intensity to the stability under high-intensity running and jumping conditions, the quality of hosiery textile covered yarns is comprehensively evaluated in all aspects. This method groups samples and divides each group into three different test lengths in order to simultaneously simulate the quality requirements of different positions of socks; for example, the friction and pressure at the toes and heels are relatively large, while the friction and pressure at the ankles and soles are relatively weak. Different weight coefficients are assigned to each evaluation indicator according to different test lengths, and the obtained comprehensive quality evaluation index can accurately reflect the comprehensive performance of the covered yarn under different conditions. The comprehensive quality evaluation method proposed in the present invention improves the accuracy of quality evaluation of hosiery textile covered yarns in dynamic and complex scenarios, and also improves the quality evaluation efficiency of hosiery textile covered yarns. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic flow chart of a quality assessment method for hosiery textile covered yarn provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of a quality assessment system for hosiery textile covered yarn provided by an embodiment of the present invention; Figure 3 A schematic diagram of sock divisions corresponding to different test lengths provided in an embodiment of the present invention.

[0020] In the figure: 1, first test length; 2, second test length; 3, third test length. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] With the improvement of living standards, people have higher and higher requirements for the quality of textiles for wearing. In the field of socks, consumers are beginning to care more about the functionality of textile materials, such as whether the foot feels comfortable, whether it fits well, whether it is sweat-absorbent and breathable, and whether the quality is durable. Based on the above considerations, coated yarns are favored by sock textile manufacturers because of their material and structural characteristics. However, coated yarns are often used in the weaving of sportswear or underwear, which is very different from the wearing environment of socks. Therefore, the current general quality inspection methods for yarns mostly rely on traditional static testing methods, such as tensile tests, break tests, and appearance tests, etc., and lack a comprehensive evaluation of the yarn under the influence of multiple complex factors such as long-term stress, friction, and deformation in the actual environment. That is, the existing yarn quality inspection methods cannot be simply applied to the quality assessment of coated yarns for sock textiles.

[0023] In order to make up for the shortcomings of the current detection method and improve the quality assessment effect and efficiency of hosiery textile covered yarn, the present invention provides a quality assessment method for hosiery textile covered yarn, which is applied to a quality assessment system for hosiery textile covered yarn. Figure 1 and Figure 2 , the following will combine Figure 1 and Figure 2 The present invention provides a method and system for evaluating the quality of covered yarns for hosiery textiles in a specific implementation manner.

[0024] Embodiment 1 This embodiment is used to combine Figure 1 The present invention describes a specific implementation of a quality assessment method for hosiery textile covered yarn. Figure 1 A schematic flow chart of a quality assessment method for hosiery textile covered yarn provided in an embodiment.

[0025] Reference Figure 1 S10 in the method is used to obtain samples of the same production batch of hosiery textile covered yarns, and divide the samples into a first test sample, a second test sample and a third test sample; each group of test samples is divided into a first test length 1, a second test length 2 and a third test length 3. Specifically: In this embodiment, a batch of covered yarn samples are first obtained from the covered yarn production line of covered yarn production factory A, and the batch of samples are divided into three groups: first test samples, second test samples and third test samples; for each group of samples, it is divided into a first test length 1, a second test length 2 and a third test length 3. Here, different test lengths are used to distinguish the quality requirements of the covered yarn at different positions of the socks, such as the ankle, heel, sole and toe positions, referring to Figure 3 , Figure 3 A schematic diagram of sock divisions corresponding to different test lengths provided in this embodiment.

[0026] In this embodiment, 360 covered yarns of the same batch were obtained from the covered yarn production line of covered yarn production factory A and were equally divided into three groups of test samples. Each group of test samples was divided into three lengths of 15 cm, 30 cm and 45 cm, and each length had 40 test samples.

[0027] Further, refer to Figure 1 S20 in the method is used to perform dynamic friction and durability evaluation on the first test sample, obtain the strength change and fracture of the first test sample under continuous friction, and calculate the durability evaluation index of the coated yarn. Specifically: The friction force, friction frequency and friction cycle of the friction tester are set, and first test samples of different lengths are placed in the friction tester so that the friction process covers the entire surface of the first test sample, simulating the friction force that the coated yarn is subjected to during actual wearing after being made into socks.

[0028] Before and after a friction test cycle, use a stress strain tester to test the strength change of the first test sample of different lengths and calculate the strength change rate ; The calculation formula of strength change rate is: ; In the formula for the rate of change of intensity, and They are the strength of the first test sample before one friction cycle and the strength after one friction cycle, respectively.

[0029] The target detection algorithm is used to obtain the number of fractures of the first test samples of different lengths after one cycle, and the loss rate of the first test sample in one friction cycle is calculated. ; The calculation formula of loss rate is: ; In the loss rate calculation formula, is the number of first test samples of different lengths, is the number of breaks of the first test samples of different lengths.

[0030] The durability evaluation index of the first test sample is calculated by combining the strength change rate and loss rate of the first test sample: ; in, is a durability evaluation index. and is a constant coefficient, and As parameters, for right In this embodiment, and are set to 0.2 and 0.8 respectively; and is set to 0.05 and 0.1; Set to 2. In actual usage scenarios, the above constant coefficients, parameters and nonlinear influencing factors can be adjusted according to the settings of the friction testing machine and the actual quality requirements.

[0031] The parameter settings of the friction tester in this embodiment include but are not limited to: friction force 10N, friction frequency 1Hz and friction cycle 5000 times; this embodiment conducts three rounds of friction tests in total, and the test value takes the average value of the three rounds of tests. The durability evaluation index of the first test sample is shown in Table 1.

[0032] Table 1 Durability evaluation index of the first test sample

[0033] This embodiment simulates the friction and pressure that socks are subjected to during actual wearing, and conducts a friction test on the covered yarn used for sock weaving, which can accurately evaluate the durability of the covered yarn after it is made into socks. The strength change rate mainly measures the friction resistance and strength retention ability of the covered yarn, and can reflect whether the covered yarn socks can maintain sufficient strength under long-term wear; the loss rate mainly measures the fracture resistance of the covered yarn, and reflects the wear of the covered yarn socks in actual use scenarios. This method combines the strength change rate and loss rate of the covered yarn, simulates and evaluates the durability of the covered yarn socks, and calculates the evaluation index, providing data and theoretical basis for the evaluation of the comprehensive quality of the covered yarn from the perspective of durability.

[0034] Further, refer to Figure 1 S30 in the embodiment is used to evaluate the compression and fit of the second test sample, obtain the recovery degree and rebound of the second test sample during the dynamic compression process, and calculate the fit evaluation index of the coated yarn. Specifically: Setting the pressure, dynamic frequency, compression amplitude and compression cycle of the compression tester, applying pressure to the second test samples of different lengths using the compression tester; and recording the compression test process using a high-speed camera; The sample height before compression, maximum compression and rebound, as well as the rebound time are extracted through OpenCV image processing technology; the rebound rate of the second test sample of different lengths during dynamic compression is calculated Rebound rate , the calculation formulas for rebound rate and rebound velocity are: ; In the above formula, and are the heights of the second test sample before compression and after rebound, The height at which the second test sample reaches maximum compression, For the second test sample from Rebound to The time elapsed.

[0035] Set the deformation threshold of the second test sample to , record the number of samples whose deformation amplitude after compression exceeds the threshold after a compression cycle, and calculate the deformation rate of the second test sample : ; in, The deformation amplitude exceeds the threshold The number of second test samples, is the number of second test samples of different lengths.

[0036] The resilience, rebound rate and deformation rate of the second test sample are combined to calculate the fit evaluation index of the second test sample: ; in, Fit evaluation index, and is the weight coefficient, satisfying ; and They are , and In this embodiment, and Set to 0.4, 0.3 and 0.3 respectively; and They are set to 1.2, 1.1 and 1.3 respectively; the weight coefficient and nonlinear index in the above formula can be dynamically adjusted according to the settings of the compression testing machine and the actual quality requirements.

[0037] The parameter settings of the compression testing machine in this embodiment include but are not limited to: friction force 10N, compression frequency 1Hz, compression amplitude 1.5mm and compression cycle 5000 times; this embodiment performs three rounds of compression tests, and the test value takes the average value of the three rounds of tests. The fit evaluation index of the second test sample is shown in Table 2.

[0038] Table 2 Evaluation index of the fit of the second test sample

[0039] This embodiment uses a compression testing machine to apply dynamic compression to test samples of different lengths, and uses a high-speed camera and image processing technology to accurately obtain the rebound and deformation characteristics of the coated yarn during the dynamic compression process. The rebound rate mainly measures the ability of the coated yarn to recover its original shape after compression or stretching, and reflects the degree of recovery of the coated yarn hosiery after deformation with the foot movement when worn; the rebound rate measures the speed at which the coated yarn recovers its shape after compression, and reflects whether the coated yarn hosiery can quickly adapt to the deformation of the foot, whether there will be a sense of restraint or "not following the foot" performance; the deformation rate measures the degree of deformation of the coated yarn after multiple compressions, and reflects whether the coated yarn hosiery can maintain its shape and fit the foot stably after multiple wears. This method combines the rebound rate, rebound rate and deformation rate of the coated yarn, simulates the fit of the coated yarn hosiery and calculates the fit evaluation index, and provides modular support for improving the comprehensiveness and accuracy of the comprehensive quality evaluation of the coated yarn from the perspective of fit.

[0040] Further, refer to Figure 1 S40 in the method is used to evaluate the anti-shedding property of the coating layer of the third test sample, obtain the shedding and damage conditions of the outer fiber of the third test sample, and calculate the stability evaluation index of the coated yarn. Specifically: A tensile tester is placed in the friction tester, and the friction force, tensile force, force application frequency and force application cycle are set, and the friction force and tensile force are applied comprehensively to the third test samples of different lengths; The images of the third test sample of different lengths before and after a force cycle are obtained, and the area of ​​the third test sample in the image before a force cycle and the exposed area of ​​the inner core wire after a force cycle are extracted by a contour detection method; the shedding rate of the coating layer of the third test sample is calculated by the ratio of the exposed area of ​​the inner core wire in the image to the area of ​​the third test sample. : ; in, is the exposed area of ​​the inner core wire in the image, is the area of ​​the third test sample in the image.

[0041] In one force application cycle, the coating shedding rate of the third test sample is calculated several times, and the coating shedding rate of the third test sample is calculated. : ; in, and They are respectively Second and The calculated coating shedding rate is For the Second and The time difference for calculating the dropout rate.

[0042] The stability evaluation index of the third test sample is calculated by combining the coating shedding rate and coating shedding rate of the third test sample. : ; in, and They are and The weight coefficient satisfies In this embodiment, and They are set to 0.6 and 0.4 respectively, and can be adjusted dynamically according to actual quality requirements.

[0043] The parameter settings of friction and tension in this embodiment include but are not limited to: friction force 30N, tension 30N, force application frequency 1Hz and force application cycle 5000 times; this embodiment conducts a total of three rounds of friction and tension comprehensive tests, and the test value is the average value of the three rounds. The stability evaluation index of the third test sample is shown in Table 3.

[0044] Table 3 Stability evaluation index of the third test sample

[0045] This embodiment combines friction and tension tests, applies friction and tension to the third test sample at the same time, and uses the contour detection method to extract the area of ​​the third test sample and the exposed area of ​​the inner core wire before and after the friction and tension comprehensive test, which can accurately obtain the stability of the coating layer of the coated yarn under high-intensity friction and tensile conditions. The coating shedding rate measures the degree of shedding of the outer fiber of the coated yarn under external forces such as strong friction and pressure, and reflects whether the coated yarn hosiery can maintain smoothness and stability under wearing conditions such as running and jumping; the coating shedding rate measures the ability of the coated yarn to maintain the integrity of the outer fiber under long-term friction and tension, and reflects the wear resistance of the coated yarn hosiery under high-intensity wearing conditions. This method combines the coating shedding rate and coating shedding rate of the coated yarn, simulates the stability of the coated yarn hosiery under extreme conditions such as high-intensity running and jumping, and calculates the stability evaluation index, which provides a new idea for improving the accuracy of the comprehensive quality evaluation of the coated yarn from the perspective of anti-shedding performance.

[0046] Further, refer to Figure 1 S50 in the test is used to comprehensively evaluate the durability, fit and stability of the yarn, and calculate the comprehensive quality index of the covered yarn samples of different test lengths; the comprehensive quality index is compared with the quality threshold to determine whether the quality of the sample is qualified. Specifically: For the first test sample, the second test sample and the third test sample of the same length, the comprehensive quality index is calculated based on the durability evaluation index, the fit evaluation index and the stability evaluation index; the calculation formula of the comprehensive quality index is: ; in, For the The test length corresponds to the comprehensive quality index of the sample, and Respectively The test length corresponds to the durability evaluation index, fit evaluation index and stability evaluation index of the sample; and They are and The weight coefficient satisfies ; This embodiment will and The comprehensive quality indexes of the samples of the coated yarns of different lengths obtained in this embodiment are shown in Table 4.

[0047] Table 4 Comprehensive quality index of this batch of covered yarn samples

[0048] Different quality thresholds are set for samples of different lengths, and the quality thresholds of covered yarns of 15cm, 30cm and 45cm are set to 2.4, 2.3 and 2.2 respectively; covered yarns exceeding the quality thresholds of covered yarns of corresponding lengths are deemed to be of qualified quality, and covered yarns that do not reach the quality thresholds of covered yarns of corresponding lengths are deemed to be of unqualified quality and fail to meet the hosiery textile standards.

[0049] In this embodiment, for the covered yarn samples of different lengths, the corresponding durability evaluation index, fit evaluation index and stability evaluation index are comprehensively calculated with different weight ratios as a comprehensive quality index to evaluate the quality results of the batch of covered yarn samples applied to socks textile. The durability evaluation index can reflect the strength change and loss of the covered yarn socks under daily wear, the fit evaluation index reflects the fit ability of the covered yarn socks as the footsteps change, and the stability evaluation focuses on the anti-falling ability of the coating layer, reflecting the ability of the covered yarn socks to maintain the integrity of the fiber structure in high-intensity sports scenes. The comprehensive quality index calculated by the present invention based on the above factors can comprehensively evaluate the various performance indicators of the socks textile covered yarn and accurately quantify the quality performance of the socks textile covered yarn under different conditions.

[0050] This embodiment first obtains the same batch of coated yarn from the coated yarn production line and divides it into different test sample groups, and evaluates the quality of the samples according to different test lengths. Different lengths correspond to the quality standard requirements of different parts of the socks, which improves the comprehensiveness of the evaluation. Then, this embodiment performs a friction test on the first test sample to simulate the friction that the coated yarn socks are subjected to during actual daily wear, obtains the strength change rate and fracture of the first test sample, and calculates the durability evaluation index; performs a compression test on the second test sample to simulate the elastic recovery performance of the coated yarn socks in actual daily wear, obtains the rebound performance and deformation of the second test sample, and calculates the fit evaluation index; performs a comprehensive strong friction and tension test on the third test sample to simulate the anti-shedding performance of the outer fiber of the coated yarn socks in high-intensity running and jumping scenarios, and calculates the stability evaluation index. Finally, the comprehensive quality index of the batch of socks textile covering yarn is calculated by comprehensively evaluating the durability, fit and stability. This can comprehensively and accurately reflect the quality of the socks textile covering yarn, provide effective theoretical and technical support for the quality control of socks production, and ensure the comfort and durability of the socks produced in actual use scenarios.

[0051] Embodiment 2 This embodiment is used to combine Figure 2 The specific implementation of the quality assessment system for hosiery textile covered yarn proposed by the present invention is described. Figure 2 A schematic structural diagram of a quality assessment system for hosiery textile covered yarn provided in this embodiment.

[0052] The present invention provides a quality assessment system for hosiery textile covered yarns, comprising a sample acquisition unit, a durability assessment unit, a fit assessment unit, a stability assessment unit and a comprehensive quality assessment unit.

[0053] Furthermore, the sample acquisition unit acquires the same batch of covered yarn samples and divides them into three groups: the first test sample, the second test sample and the third test sample; each group of samples is divided into the first test length 1, the second test length 2 and the third test length 3. Here, different test lengths are used to distinguish the quality requirements of the covered yarn at different positions of the socks, such as the ankle, heel, sole and toe positions.

[0054] Furthermore, dynamic friction and durability evaluation is performed by a durability evaluation unit, specifically: The friction force, friction frequency and friction cycle of the friction tester are set, and first test samples of different lengths are placed in the friction tester so that the friction process covers the entire surface of the first test sample, simulating the friction force that the coated yarn is subjected to during actual wearing after being made into socks.

[0055] Before and after a friction test cycle, the stress strain tester is used to test the strength change of the first test samples of different lengths, and the strength change rate is calculated. The target detection algorithm is used to obtain the number of fractures of the first test samples of different lengths after a cycle, and the loss rate of the first test sample in a friction cycle is calculated. Combining the strength change rate and loss rate of the first test sample, the durability evaluation index of the first test sample is calculated: Furthermore, compression and fit evaluation are performed by a fit evaluation unit, specifically: Setting the pressure, dynamic frequency, compression amplitude and compression cycle of the compression tester, applying pressure to the second test samples of different lengths using the compression tester; and recording the compression test process using a high-speed camera; The sample heights before compression, after maximum compression and rebound, as well as the rebound time were extracted using OpenCV image processing technology; the rebound rate and rebound velocity of the second test samples of different lengths during dynamic compression were calculated.

[0056] After one compression cycle, the number of samples of which the deformation amplitude of the second test sample after compression exceeds the threshold is recorded, and the deformation rate of the second test sample is calculated.

[0057] The resilience, resilience rate and deformation rate of the second test sample are comprehensively considered to calculate the fit evaluation index of the second test sample.

[0058] Furthermore, the coating layer anti-falling property is evaluated by the stability evaluation unit, specifically: A tensile tester is placed in the friction tester, and the friction force, tensile force, force application frequency and force application cycle are set, and the friction force and tensile force are applied comprehensively to the third test samples of different lengths; Images of the third test sample of different lengths before and after a force application cycle are obtained, and the area of ​​the third test sample in the image before a force application cycle and the exposed area of ​​the inner core wire after a force application cycle are extracted using a contour detection method.

[0059] The coating shedding rate of the third test sample is calculated by the ratio of the exposed area of ​​the inner core wire in the image to the area of ​​the third test sample. In one force application cycle, the coating shedding rate of the third test sample is calculated several times to calculate the coating shedding rate of the third test sample. The stability evaluation index of the third test sample is calculated by combining the coating shedding rate and the coating shedding rate of the third test sample.

[0060] Further, the comprehensive quality index is calculated by the comprehensive quality evaluation unit, specifically: For the first test sample, the second test sample and the third test sample of the same length, the comprehensive quality index is calculated by comprehensively considering the durability evaluation index, the fit evaluation index and the stability evaluation index.

[0061] In this embodiment, 720 covered yarns of the second batch were obtained from the covered yarn production line of covered yarn production plant A and were equally divided into three groups of test samples. Each group of test samples was divided into three lengths of 15 cm, 30 cm and 45 cm, and each length had 80 test samples.

[0062] In this embodiment, the weights of the durability evaluation index, the fit evaluation index and the stability evaluation index are set to 0.3, 0.4 and 0.3 respectively; the comprehensive quality index of the second batch of covered yarn samples of different lengths is shown in Table 5.

[0063] Table 5 Comprehensive quality index of the second batch of covered yarn samples

[0064] Different quality thresholds are set for samples of different lengths, and the quality thresholds of the second batch of covered yarns of 15cm, 30cm and 45cm are set to 2.5, 2.4 and 2.4 respectively; the covered yarns exceeding the quality thresholds of the covered yarns of the corresponding lengths are deemed to be of qualified quality, and the covered yarns that do not reach the quality thresholds of the covered yarns of the corresponding lengths are deemed to be of unqualified quality and fail to meet the hosiery textile standards.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quality assessment method for hosiery textile covered yarn, characterized in that: include: Obtaining samples of textile covered yarns of hosiery products from the same production batch, dividing the samples into a first test sample, a second test sample and a third test sample; dividing each group of the test samples into a first test length (1), a second test length (2) and a third test length (3); Applying dynamic friction to the first test sample to obtain a strength change of the first test sample under continuous friction, and using a target detection algorithm to obtain a fracture condition of the first test sample; Calculating a durability evaluation index of the covered yarn according to the fracture condition; Applying periodic compression to the second test sample, obtaining the recovery and rebound conditions of the second test sample during the dynamic compression process through an image processing algorithm, and calculating the fit evaluation index of the coated yarn according to the recovery and rebound conditions; The coating resistance of the third test sample is evaluated, the inner core wire exposed area of ​​the third test sample is obtained by a contour detection method, and the stability evaluation index of the coated yarn is calculated according to the inner core wire exposed area; The durability evaluation index, the fit evaluation index and the stability evaluation index are comprehensively considered to calculate the comprehensive quality index of the covered yarn samples of different test lengths; the comprehensive quality index is compared with the quality threshold to determine whether the quality of the sample is qualified.

2. A quality assessment method for hosiery textile covered yarn according to claim 1, characterized in that: The process of obtaining the durability evaluation index includes: Setting the friction force, friction frequency and friction cycle of the friction test, applying the friction test to the first test sample; recording the strength change of the first test sample and calculating the strength change rate ; Use the target detection algorithm to obtain the number of fractures of the first test sample after a friction cycle, and calculate the loss rate of the first test sample ; By formula Calculation of the durability evaluation index ;in, and is a constant coefficient, and As parameters, for right The nonlinear impact factor.

3. A quality assessment method for hosiery textile covered yarn according to claim 1, characterized in that: The process of obtaining the fit evaluation index includes: Setting the pressure, dynamic frequency, compression amplitude and compression cycle of the compression test, applying the compression test to the second test sample; measuring the rebound rate of the second test sample during the dynamic compression process by the image processing algorithm Rebound rate ; Record the number of the second test samples whose deformation amplitude exceeds the threshold after one compression cycle, and calculate the deformation rate of the second test sample ; By formula Calculate the fit evaluation index ;in, and is the weight coefficient, satisfying ; and They are , and The nonlinear index.

4. A quality assessment method for hosiery textile covered yarn according to claim 1, characterized in that: The step of obtaining the stability evaluation index comprises: The friction force, tension, frequency and force application cycle of the friction and tension comprehensive test are set, and the friction and tension comprehensive test is comprehensively applied to the third test sample; the exposed area of ​​the inner core wire of the third test sample after one force application cycle is extracted by the contour detection method, and the shedding rate of the coating layer of the third test sample is calculated ; In one force application cycle, the coating shedding rate of the third test sample is calculated several times, and the coating shedding rate of the third test sample is calculated ; pass Calculate the stability evaluation index ;in, and They are and The weight coefficient satisfies .

5. The quality assessment method for covered yarn of hosiery textile according to claim 1, characterized in that: The calculation process of the comprehensive quality index of the covered yarn sample includes: For the first test sample, the second test sample and the third test sample of the same length, the comprehensive quality index is calculated by comprehensively considering the durability evaluation index, the fit evaluation index and the stability evaluation index; the calculation formula of the comprehensive quality index is: ;in, For the The test length corresponds to the comprehensive quality index of the sample, and Respectively The test length corresponds to the durability evaluation index, the fit evaluation index and the stability evaluation index of the sample; and They are and The weight coefficient satisfies ; Different quality thresholds are set for the samples of different lengths, and whether the quality of the sample is qualified is judged based on the comparison between the comprehensive quality index of the sample and the quality threshold.

6. A quality assessment system for hosiery textile covered yarn, characterized in that: include: Sample acquisition unit: used for acquiring samples of textile covered yarns of hosiery products from the same production batch, dividing the samples into a first test sample, a second test sample and a third test sample; and dividing each group of the test samples into a first test length (1), a second test length (2) and a third test length (3); Durability evaluation unit: used for applying dynamic friction to the first test sample, obtaining the strength change of the first test sample under continuous friction, and obtaining the fracture condition of the first test sample by using a target detection algorithm; Calculating a durability evaluation index of the covered yarn according to the fracture condition; A fit evaluation unit: used for applying periodic compression to the second test sample, obtaining the recovery and rebound conditions of the second test sample during the dynamic compression process through an image processing algorithm, and calculating the fit evaluation index of the coated yarn according to the recovery and rebound conditions; Stability evaluation unit: used to evaluate the anti-shedding property of the coating layer of the third test sample, obtain the exposed area of ​​the inner core wire of the third test sample by a contour detection method, and calculate the stability evaluation index of the coated yarn according to the exposed area of ​​the inner core wire; Comprehensive quality assessment unit: used to comprehensively consider the durability assessment index, the fit assessment index and the stability assessment index to calculate the comprehensive quality index of the covered yarn samples of different test lengths; compare the comprehensive quality index with the quality threshold to determine whether the quality of the sample is qualified.

7. A quality assessment system for hosiery textile covered yarn according to claim 6, characterized in that: The process of obtaining the durability evaluation index includes: The friction force, friction frequency and friction cycle of the friction test are set, and the friction test is applied to the first test sample; the strength change of the first test sample is recorded and the strength change rate is calculated; the target detection algorithm is used to obtain the number of fractures of the first test sample after a friction cycle, and the loss rate of the first test sample is calculated; the durability evaluation index is calculated by combining the strength change rate and the loss rate.

8. A quality assessment system for hosiery textile covered yarn according to claim 6, characterized in that: The process of obtaining the fit evaluation index includes: The pressure, dynamic frequency, compression amplitude and compression cycle of the compression test are set, and the compression test is applied to the second test sample; the rebound rate and rebound velocity of the second test sample during the dynamic compression process are measured by the image processing algorithm; the number of the second test samples whose deformation amplitude exceeds the threshold after a compression cycle is recorded, and the deformation rate of the second test sample is calculated; the fit evaluation index is calculated by comprehensively considering the rebound rate, the rebound velocity and the deformation rate.

9. A quality assessment system for hosiery textile covered yarn according to claim 6, characterized in that: The step of obtaining the stability evaluation index comprises: The friction force, tension, frequency and force application cycle of the comprehensive friction and tension test are set, and the comprehensive friction and tension test is comprehensively applied to the third test sample; the exposed area of ​​the inner core wire of the third test sample after one force application cycle is extracted by the contour detection method, and the coating shedding rate of the third test sample is calculated; the coating shedding rate is calculated several times within one force application cycle, and the coating shedding rate of the third test sample is calculated; the stability evaluation index is calculated by comprehensively considering the coating shedding rate and the coating shedding rate.

10. A quality assessment system for hosiery textile covered yarn according to claim 6, characterized in that: The calculation process of the comprehensive quality index of the covered yarn sample includes: For the first test sample, the second test sample and the third test sample of the same length, the comprehensive quality index is calculated by comprehensively considering the durability evaluation index, the fit evaluation index and the stability evaluation index; Different quality thresholds are set for the samples of different lengths, and whether the quality of the sample is qualified is judged based on the comparison between the comprehensive quality index of the sample and the quality threshold.

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