the afn and ceramic finish applicator guide is actually lower than the sum of the individual coefficients of friction this result actually confirms the wiping action of the afn which apparently leads to a lowering of a contact area between the ceramic application guide and moving yarn to summarize the friction experiments the afn showed approximately 14 higher friction than the low friction ceramic guide the combination of the afn and ceramic applicator guide showed a 17 higher coefficient of friction compared to the low friction ceramic applicator guide alone thorough comparison of friction surfaces involves 3 dimensional plots of yarn speed v input tension v coefficient of friction for each of the afn ceramic guide and the combination of afn ceramic guide the comparison reveals one very important detail of the afn 39 s performance for the ceramic applicator guide the higher the speed the higher the friction and such an increase is virtually linearly proportional to the yarn speed at the same time the afn exhibits a slowing of friction build up with increased speed and this effect is also pronounced for the combination of the afn and ceramic applicator guide this means that at yarn speeds exceeding 1000 m min.