A New Photoelectric Device for the Measurement of Yarn Diameter and Yarn Evenness. Part I: Improvement of the Variance of Radiant Intensity by Using the Area-compensation Method (ACM)

Tsai, I-Shou; Chu, W.-C.

doi:10.1080/00405009608631350

Cited by 10 publications

(2 citation statements)

References 6 publications

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“…Different methods for measuring yarn´s dimensions employing optical methods are found in the literature. Among them, it is possible to highlight the TEM (Transmission Electron Microscopy) [2] and the SEM (Scanning Electron Microscopy) [1,2,3] methods, but some other methods where employed [4,5,6,7,8,9,10,11]. These methods are extremely accurate, however, they perform static measurement of the yarns, which means that, during the experimental tests, the yarn is tensioned to a certain length, the test is paused to take measurements, and after the tensioning is resumed.…”

Section: Multifilament Yarn Diameter Measuring Methodsmentioning

confidence: 99%

Longitudinal and Transversal Behavior of Multifilament Yarn Subjected to Longitudinal Load Using Image Analysis

Vinha¹,

Fangueiro

2019

KEM

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The understanding of textile yarns behavior is of paramount relevance for the textile industry, mainly for technical applications. This describes the research work to introduce an alternative method for both yarns diameter and volumetric measurement using image analysis. Its main goal is to better describe the transverse dynamic behavior of multifilament yarns when submitted to tensile loads. Methods for measuring yarns diameter found in the literature are described and discussed. The proposed method presents significant advantages allowing the possibility to perform tests without interruption, as well as the ability to generate a greater amount of data, providing more accurate results. Longitudinal tensile tests using two types of multifilament polyamide yarns were performed and their actual dynamic behavior is analyzed using the experimental results.

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Section: Multifilament Yarn Diameter Measuring Methodsmentioning

confidence: 99%

Longitudinal and Transversal Behavior of Multifilament Yarn Subjected to Longitudinal Load Using Image Analysis

Vinha¹,

Fangueiro

2019

KEM

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“…The work is time-consuming because multiple sets of samples should be measured in order to get accurate results. Capacitive measurement [20] is based on monitoring the capacitance changes in proportion to the fiber amount in yarn section. This method can compute the yarn diameter indirectly through measuring the yarn mass.…”

Section: Introductionmentioning

confidence: 99%

Measuring the unevenness of yarn apparent diameter from yarn sequence images

Pan

Zhang

et al. 2015

Meas. Sci. Technol.

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This article presents a novel method for measuring the unevenness of yarn apparent diameter based on yarn sequence images captured from a moving yarn. A dynamic threshold module was designed to gain the global threshold for segmenting yarns in the sequence images. In the module, a K-means clustering algorithm was employed to classify the pixels of each frame in the sequence into two clusters—yarn and background. The cluster center of the current frame was used as the initial value of the cluster center for the next frame in the sequence to expedite the segmentation process. From the segmented yarn image, the yarn core was further extracted utilizing the characteristics of yarn hairiness, and two judgment templates were adopted to remove burrs, isolated points and unrelated small areas in the images. The yarn apparent diameter was measured on the yarn core at a given interval. The same kind of yarns were tested by using this method and Uster Evenness Tester 5. The experimental results show that the proposed method can accurately detect the unevenness of yarn apparent diameter and provide new useful information about yarn unevenness, such as the short-term, the long-term, and the periodic variations of yarn apparent diameters.

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Development of a new infrared device for monitoring the coefficient of variation in yarns

Huang

Tang

2007

J of Applied Polymer Sci

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The coefficient of variation (CV) in yarns is the most important evenness characteristic in textile processing and quality control. This article develops a new infrared device for monitoring the coefficient of variation in yarns, based on on-line measurement of the yarn diameter, during the yarn manufacturing process. The device is composed of a 555 astable oscillator, four pairs of infrared emitters and receivers, a summing amplifier, an inverting amplifier, an alternating current (AC) to direct current (DC) converter, a unity-gain second-order Sallen-Key lowpass filter, and a data acquisition system. The optimum values of some factors with the circuit, including the oscillator frequency, amplified gain, cutoff frequency of the low-pass filter, sampling time, and number of sampling data to be averaged in the moving average method, are systematically chosen by the Taguchi method to reduce the variance in the output voltage of the device. The CV based on measured yarn diameter data is transformed to that based on mass profiles. The experimental results reveal that the CVs evaluated by the infrared device are close to those by the Uster Evenness Tester, which is verified by the statistical analysis of variance.

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A New Photoelectric Device for the Measurement of Yarn Diameter and Yarn Evenness. Part I: Improvement of the Variance of Radiant Intensity by Using the Area-compensation Method (ACM)

Cited by 10 publications

References 6 publications

Longitudinal and Transversal Behavior of Multifilament Yarn Subjected to Longitudinal Load Using Image Analysis

Longitudinal and Transversal Behavior of Multifilament Yarn Subjected to Longitudinal Load Using Image Analysis

Measuring the unevenness of yarn apparent diameter from yarn sequence images

Development of a new infrared device for monitoring the coefficient of variation in yarns

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