1. The optical projection method places the yarn under a microscope equipped with an eyepiece test ruler at about 100 times, or under a projector with the same magnification, with a predetermined tension, and after focusing, the projected shape of the yarn surface can be obtained. Determine the diameter standard after removing hairiness, randomly select detection points on the yarn at a certain interval, and after more than 300 observation values are obtained, the average value of the yarn diameter is calculated by statistical method. Due to the fuzzy characteristics of the yarn diameter boundary, the artificial definition of the yarn diameter to remove the fuzzy boundary of the yarn hairiness is affected by human subjective factors.
This method has human observation and visual error, but since the yarn has been magnified 100 times during the test, the accuracy of visual inspection has been improved, and the test results are still relatively correct. The disadvantage of this method is that there are many test points required for the sample, the operation is time-consuming and laborious, and the test efficiency is low.
2. Indirect calculation method Due to the shortcomings of measuring diameter by optical projection method, a diameter calculation method derived from the formula of yarn fineness is produced. Let the yarn be a cylinder, the length is L (mm), the weight is G (mg), and the cross-sectional area is S (mm)²), the volume weight isδ(g/cm³), the diameter is d (mm): the relationship between the diameter of the yarn and the yarn special number Nt, the metric count Nm, and the fineness D is: the volume weight of the yarnδIt is related to the nature of the fiber and the twist of the yarn. The common yarn volume weight values are shown in the table: if it is expressed by a general formula, the expression of the yarn diameter can be written as where Kd is called the yarn diameter coefficient in order to find a certain value. The diameter of a kind of yarn must be measured by its diameter coefficient. The diameter coefficient of the yarn is also determined by the optical projection method, so the direct calculation of the diameter is essentially an optical method test. The disadvantage of this method is that the yarn diameter coefficient Kd is related to the volume weight of the yarnδrelated. With different yarn varieties, different blending ratios and the emergence of new fibers, the volume weight of the yarn changes greatly, and the diameter calculated by the diameter coefficient of the yarn is greatly restricted.
Electronic Wrap Reel to produce skeins of yarn of a pre-determined length and number of turns for count and/or strength testing. Complete with yarn package stand and pre-tension device, fitted with pre-determined counter.
The ISO2062 Single Yarn Testing Machine is designed to measure the breaking load and elongation of single yarns, with a force capacity up to 5000 centigrams. This electronically operated machine provides two force scales, 0-500cg and 0-5000cg, along with an extension scale graduated in millimeters and percentage of the standard test length (500mm).
Yarn Twist Tester, to determine yarn twist in single or plied yarns, quadrant type with auto stop & reverse for conventional or untwist/re-twist methods. Twist tester is very important in textile testing. Our Yarn Twisting Machine price is also competitive.
Electronic Single Yarn Strength Tester is used to test the breaking strength and elongation percentage of various cotton, wool, linen, silk, chemical fiber, core-spun single yarn, pure or blending natural or chemical fiber yarns.
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