How are the strength and elongation of knitting yarns measured?
Publish Time: 2025-01-09
The strength and elongation of knitting yarns are important indicators of their physical properties, which have an important impact on the quality, durability and comfort of fabrics. The determination of these properties is carried out through a series of standardized test methods to ensure the accuracy and comparability of the results.The strength determination of knitting yarns mainly focuses on the maximum tensile force that the yarn can withstand. This test is usually carried out using an electronic tensile testing machine. During the test, the knitting yarn is clamped in the fixture of the testing machine and then stretched at a constant speed until the yarn breaks. The testing machine will record the maximum tensile force when the yarn breaks, that is, the breaking strength. This value reflects the yarn's ability to resist stretching and is one of the key indicators for evaluating yarn quality.In addition to strength, elongation is also an important parameter for knitting yarn performance. Elongation indicates the percentage by which the yarn can be stretched before breaking. This test is also carried out on an electronic tensile testing machine. During the stretching process, the test machine will record the original length of the yarn and the length when it breaks. By calculating the ratio of the difference between the two and the original length, the elongation can be obtained. The size of the elongation reflects the elasticity and plastic deformation ability of the yarn, which is of great significance to the elasticity and recovery of the fabric.When testing the strength and elongation of knitting yarn, certain test standards and procedures need to be followed. For example, the preparation of samples, the selection of fixtures, the setting of test speed, etc. need to be carried out in accordance with relevant standards. In addition, during the test, attention should be paid to avoiding stress concentration, premature failure of samples, etc. to ensure the accuracy of the test results.It is worth noting that the strength and elongation of knitting yarn are affected by many factors, such as fiber type, yarn structure, production process, etc. Therefore, when determining these properties, it is necessary to fully consider the impact of these factors on the test results. At the same time, different test methods and standards may be required for evaluation of different types of knitting yarn.In summary, the strength and elongation of knitting yarn are determined by standardized test methods. These test methods can accurately reflect the physical properties of yarns and provide important basis for fabric quality assessment and process optimization. In practical applications, we need to select appropriate test methods and standards according to the specific type and purpose of knitting yarn to ensure the accuracy and reliability of the test results.
