Spin finish oil (OPU) test Process
The spin finish oil is a molecular layer applied to the surfaces of fibers to improve anti-static properties and induce inter-adhesion between filaments. It is a major parameter of yarn quality. The spin finish oil content has a minimum level and a maximum level. Iranian National Standard No. 925 proposes a spin finish oil content range of 0.7–1.3% for FDY yarn.
Spin finish oil Content (OPU) Test
- ASTM D2257 under National Iranian Standard No. 925 for the spin finish oil content of FDY yarn
- The Iranian National Standard proposes a spin finish oil content range of 0.25–1.0% for POY and 1–3% for DTY yarn.
- An oil extractor with an efficient solvent for oil extraction, a digital scale with a precision of 0.1 mg, and an oven with a desiccator to dry yarn samples are employed to measure the spin finish oil content of yarns.
Solvents used on this test:
Alcohols and halogenated hydrocarbons are used as solvents:
- Chloroform tetrachloromethane or ethanol