The chemical fiber finish mainly adjusts the friction of the fiber surface and gives the fiber smooth and soft properties. At the same time, it prevents or eliminates the accumulation of static electricity, so that chemical fibers can smoothly pass through the processes of spinning, drawing, and spinning.
 ALFA NMR uses low-intensity pulsed nuclear magnetic resonance to detect the oil content of chemical fibers. This method has the advantages of fast speed, simple operation and easy correction.
 Detection method: Establish a calibration curve before testing the samples. Generally, at least 6 standard samples are used, preferably 12 . During the test, first weigh the sample, log the electronic balance data into the computer manually or automatically, and then load the sample into the test hole on the top of the instrument. The test time is about 2 minutes .