The apparatus 1, wherein {HEAD ~ the axis} of each of the supporting rollers is spaced from the axis of an adjacent supporting roller or of a driving roller by {TAIL ~ a distance} ranging from 2 to 4 times the diameter of a supporting roller 
is spaced by
The apparatus 1 , wherein { HEAD ~ the axis } of each of the supporting rollers is spaced from the axis of an adjacent supporting roller or of a driving roller by { TAIL ~ a distance } ranging from 2 to 4 times the diameter of a supporting roller
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH