Dip on Fibers

Elastomer Coating on Fibers

For special fiber applications, an elastomer coating, so-called dip, is necessary to improve the fiber’s properties such as wind stopping, water repellent, and reinforcement. Such additional properties also qualify the fibers for technical use, for example, for clothing and for rubber products like car tires or conveyor belts. Using the minispec, the dip amount on fibers can be quickly and accurately analyzed in a one-step measurement.

Application Method

The application dip on fibers is based on different relaxation times of the dip and fiber. Measuring the decay of the time-domain (TD) NMR signal of the coated fiber, the dip signal is well-separated from the fiber signal and its amplitude correlates with the dip amount.

Note: The method requires the weight of the fiber sample. Make sure not to exceed the tube filling height. The average sample mass depends on the kind of textile and the detection limit on the amount of dip measured.

Application Example

For analyzing the dip on nylon fibers, 5 samples of known dip contents were measured for calibration. For each sample two replicates were prepared. The 18 mm sample tubes of the minispec mq20 Spin Finish Analyzer were filled with approximately 5 g of the sample and were tempered at 40°C prior to measurements. The reference values were determined using gravimetry. The comparison between TD-NMR and gravimetry is remarkable: the results are almost equal to the reference values, see figure below.