seldom occurring

See: infrequent
References in periodicals archive ?
The production process of these speciality and effect yarns create - besides the "classic yarns" seldom occurring yarn faults such as neps, short- and long faults - new, process-related yarn faults, such as "eccentric" core in core yarns, missed slubs in the slub yarn rapport, twist differences in multi-twist yarns.
The production process of these speciality and effect yarns create - besides the "classic" seldom occurring yarn faults such as neps, short- and long faults - new, process-related yarn faults, such as "eccentric" core in core yarns, missed slubs in the slub yarn rapport, twist differences in multi-twist yarns.