Abstract
The effect of ring and traveller during twisting of polyester tire cord on the cord has been examined, and the ring material and its lubricating system have been discussed in relation to large package twisting with the following results :
(1) When twisting the polyester cord with a balloon control ring to control balloonings, the polyester cord is deteriorated through melting of fibers due to friction between the cord and the balloon control ring. Therefore, the spindle speed of twisting of polyester tire cord should be reduced about 40% less than that of the nylon cord.
(2) Different from the Nylon cord, the palyester cord is not affected by twisting tension, even if the twisting tension up to 0.3g/den is given.
(3) The spindle speed can be increased about 20% by the use of a Nylon traveller and a porously sintered metal-ring having a high diffusion and high lubricating oil-maintaining ability—more than that of the oil ring.
(4) The automatic pressure lubricating system. through the inner hole having a short cross ditch is more effective than the self-lubricating system. The spindle speed can be increased about 25-30%.
(5) Under the high level twisting condition that the ring diameter is 178∅mm and traverse lift is 355mm (about 4kg pakcage), the maximum spindle speed up to 7000rpm can be possible for nylon 840d/2 cord and up to 5000rpm for polyester 1100d/2 cord.
