Dynamic evaluation method for wrinkle recovery properties of fabrics

The dynamic evaluation method of fabric wrinkle recovery performance includes the following steps: (1), using a fabric wrinkle recovery performance dynamic testing system to obtain dynamic angle data; obtaining the curve of the wrinkle recovery angle of the sample with time; (2), from step (1) Four types of indexes are extracted from the ) curve to evaluate the wrinkle recovery performance of the sample, and reflect the recovery conditions of the initial stage of recovery, the rapid elastic stage and the slow elastic stage; the present invention obtains dynamic angle data through the dynamic testing system of fabric wrinkle recovery performance, and obtains four The class index evaluates the wrinkle recovery performance of the samples. It has the advantages of being accurate and reasonable. The wrinkle recovery performance of the fabric is an important indicator to measure the quality of the fabric, which not only determines the appearance of the fabric, but also affects the service life of the fabric. At present, the standard for evaluating the wrinkle recovery performance of fabrics by the size of the recovery angle is still the static evaluation method of measuring the wrinkle recovery angle at a specific time. The angle at the moment of 5min is used as the evaluation index. However, wrinkle recovery is a dynamic process, and this evaluation method only reflects the recovery angle state of the sample at a specified time, and cannot accurately reflect the wrinkle recovery performance of the sample. For example, the recovery angle of the two fabrics is similar at 5min of the recovery process, but one of the fabrics reaches the recovery angle value of the recovery stage 5min at the beginning of the recovery stage, and the recovery angle of the other fabric continues to increase after the recovery stage 5min. . Therefore, extracting the dynamic evaluation index of fabric wrinkle recovery can realize the accurate evaluation of fabric wrinkle recovery performance. The purpose of the present invention is to propose an accurate and reasonable dynamic evaluation method for the wrinkle recovery performance of fabrics; to solve the above-mentioned problems of the prior art. The purpose of the present invention is achieved through the following technical solutions. A kind of dynamic evaluation method of fabric wrinkle recovery performance, comprising the following steps: (1), adopt fabric wrinkle recovery performance dynamic test system to obtain dynamic angle data; Obtain the wrinkle recovery angle curve of sample with time; (2), from step (1) Four kinds of indexes are extracted from the curve to evaluate the wrinkle recovery performance of the sample, and reflect the recovery situation of the initial stage of recovery, the rapid elastic stage and the slow elastic stage; The second category, the third category and the fourth category. The first type of index is the initial recovery rate, and the slope of the linear growth and fitting straight line of the angle linear growth in the initial stage of the dynamic angle data is extracted as the initial recovery rate, which reflects the recovery situation of the initial stage of the wrinkle recovery of the fabric. The second type of indicators described are the snapping time and snapping recovery angle, and the time corresponding to the maximum curvature of the dynamic angle data fitting curve is extracted as snapping time, and the recovery angle corresponding to snapping time is taken as snapping recovery angle, reflecting The transition process in which the angle changes from sharp to slow during the wrinkle recovery process of the fabric. The third type of indicators are the slow-bounce time and the slow-elastic recovery angle. The time when the fabric wrinkle recovery angle is basically stable is extracted as the slow-elastic time, and the recovery angle corresponding to the slow-elastic time is taken as the slow-elastic recovery angle, reflecting that the fabric wrinkle recovery angle is basically stable. The time required and the recovery angle; it reflects the situation in the stable stage of the wrinkle recovery of the fabric. The fourth type of index is the recovery rate, and the ratio of the recovery angle and the slow-bounce recovery angle at any moment is extracted as the recovery rate at this moment, reflecting the recovery degree of the fabric at any moment. The invention obtains dynamic angle data through the dynamic testing system of fabric wrinkle recovery performance, and obtains four types of indexes to evaluate the wrinkle recovery performance of the sample. It has the advantages of being accurate and reasonable. The specific implementation method uses a fabric wrinkle recovery performance dynamic testing system to obtain dynamic angle data. During image acquisition, the acquisition frame rate for the first 30 s is set to 30 frames/s, and the subsequent acquisition speed is set to 1 frame/s. The time curve of the wrinkle recovery angle of one of the collected samples is shown in Figure 1. In Figure 1, the recovery angle curve shows a sharp increase in the initial stage, and then gradually becomes flat and stable. Four types of indicators can be extracted from the curve to evaluate the wrinkle recovery performance of the sample, reflecting the recovery conditions of the initial stage of recovery, the rapid elastic stage and the slow elastic stage.
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