Medición del acabado de centrifugado mediante RMN

Acabado de giro Measurement by NMR

Spin finish measurement Background

Spin finish measurement is a critical quality control parameter in the textile industry as it directly determines whether the fibers meet the required specifications for their intended use. Uneven acabado de giro distribution is a common issue in chemical fiber production. Las fibras con bajo contenido de aceite son propensas a la electricidad estática., while those with high oil content are more likely to tangle, both of which can significantly impact the textile processing process. Por lo tanto, it is essential to accurately and quickly measure the oil content of fibers to effectively monitor and control the amount of acabado de giro.

Acabado de giro Métodos de medición

Various test methods are specified in the GB/T 6504–2008 “Chemical Fiber Oil Content Test Method,” including the extraction method, método de lavado con jabón neutro, método de índice de refracción óptico, and nuclear magnetic resonance (RMN) method. Además, to streamline production, some companies have developed alternative test methods such as the rapid extraction method, método de absorción atómica, método de conductividad, método de oscilación del agua destilada, y espectroscopia ultravioleta, which are tailored for specific product types.

The principles of some commonly used acabado de giro test methods are as follows:

1. Método de extracción estándar: This method involves dissolving the oil that can be dissolved in a specific organic solvent, extracting the oil from the sample using an appropriate organic solvent through a fat extractor, evaporating the solvent to dryness, and weighing the residue. Based on the oil quality and sample quality, the oil content of the sample is calculated.
2. Método de lavado con jabón neutro.: This method utilizes the affinity between soap and oil. Under the influence of washing force, El aceite de la muestra se transfiere al jabón., and the oil content of the sample is then determined by measuring the change in sample weight after washing.
3. Método del índice de refracción óptico: This method measures the refractive index of an unknown substance using the critical angle of total reflection. By quantitatively analyzing certain components in the solution, the purity of the substance can be determined.
4. Low-field nuclear magnetic resonance method: The NMR method employs NMR spectroscopy to apply a pulsed magnetic field to the fiber sample. The response magnetic signal of the sample is detected when the magnetic field is canceled. As the signal emitted by the fiber decays faster than that of the oil, the difference between the two can be used to calculate the oil content of the sample.

Advantages of Acabado de giro Measurement by NMR

Among these methods, the low-field NMR method offers several advantages for acabado de giro análisis. Most traditional detection methods for fiber oil content rely on extraction methods, which are time-consuming, yield delayed results, require the use of potentially harmful reagents, incur high labor costs, and are subject to empirical errors. In response to these limitations, NIUMAG has developed a low-field NMR method for acabado de giro pruebas.

Key performance characteristics of low-field NMR method include its speed, exactitud, and non-destructiveness. In just 30 segundos, precise acabado de giro data can be obtained, providing the possibility for online real-time quality control.

This innovative approach to acabado de giro measurement addresses the shortcomings of traditional methods, ofreciendo una solución más rápida y eficiente que garantiza una recopilación de datos precisa y facilita un control de calidad eficaz en la producción textil.

NIUMAG NMR Spin-Finish Analyzer – Benchtop NMR Analyzer Fiber PQ001