Determining Heatset Temperature by Near-Infrared Reflectance Spectroscopy

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Abstract
Heat has a significant impact on the molecular structure of nylon 6 and 66, which in turn changes the yarns' physical and chemical properties and their morphological response to further processing. One of the major components of heatsetting is the temperature at which the yarn is heatset. Nylon 6 and 66 yams were heatset at different temperatures in a Suessen unit, and near infrared (NIRA) and x-ray diffraction analyses were then made on these samples. A regression modeled calibration curve was established by measuring the NIRA reflectance of yams heatset at known temperatures. This curve was in turn used to determine effectively the heatset temperature of nylon 6 and 66 yams. Correlation of the NIRA data with the x-ray diffraction data indicates that the NIRA regression models detect and measure crystalline perfection and growth with the increase in Suessen heatset temperature.