Effect of oil composition on physical properties and spread width of polyester multifilament for spinning a composite yarn

This study examines the effect of oil composition (including the anti‐static agent ‐ alkyl ether sulfate) on the physical properties and spread width of polyester multifilament for spinning a composite yarn. The results show that the solid content and viscosity of a special oil are slightly lower than normal oil, which reduces the stickiness of the spreading multifilament. Also, the coefficient of kinetic friction μk and electrical conductivity of oiled polyester multifilaments are higher than normal oil in order to conduct and store charges, and to divide easily and spread widely to maintain good spreading performance. The content of the anti‐static agent is the most important component of a special oil. For example, the amount of alkyl ether sulfate (RO(CH2CH2O)nSO3Na) should be 14% to reduce electrical resistance, and increase spreading performance. Furthermore, the number n of oxyethylene groups(CH2CH2O) on alkyl ether sulfate is 2 or 3 in order to maintain a lower electrical resistance and wider spread width.