Compounds in metal-free, 1:1 or 1:2 metal complex form and in free acid or acid addition salt form, of formula I in which R, T, B, R61, R62, R63 and R64 are hydrogen or organic radicals defined in the Specification, and one R60 is OH the other being NH2. The compounds of formula I are useful as dyestuffs for dyeing textile materials, paper and leather.

A tape-like object such as a fastener tape the shrinkage curve of which is known traverses a plurality of rollers disposed within a heating unit. In order for the tape to travel through the heating unit in a substantially tension-free state or under a prescribed tension, a suitable feed speed based upon the shrinkage curve is obtained. The rollers are driven by drive means, responsive to commands ...