risers 418 also needs to be optimised to provide for the efficient collection of fibre initial trials have indicated that the benefits of the wire profile of the invention are most evident at low swift doffer draft ie relatively higher doffer speeds this arises because whereas at higher rotational speeds fibres slip off conventional doffer wire teeth back onto the swift the undercuts of the invention facilitate retention of the fibre and so reduce strip back off the roller ie increase the efficiency of transfer in small scale experiments with wire having the profile of fig2 and 3 the transfer efficiency was estimated to be about 20 higher than that of a control conventional wire as indicated by a measured faster rate of decay of fibre on the swift this effect is illustrated in the graph of fig7 there was a corresponding observed increase in hauteur illustrated in fig8 reflecting low retention on the swift and reduced fibre breakage the increased efficiency of the inventive wire can be used in two ways to deliver either an increase in hauteur or an increased production rate in other words topmakers can achieve either a longer wool or a higher production rate another way in which benefit might be derived from the invention is to reduce the doffer diameter from conventional values for example for worsted cards with single doffers the diameter of the doffer is typically 1000 mm it is thought that by adopting doffer wire according to the invention the diameter might be reduced to 300 mm or so there would also be a similar reduction for double doffer cards although the discussion above has been primarily.