Process for making heather yarn from bulked continuous-filament yarns

Claim 1

An improved process for making a bulked, continuous-filament, heather-dyeable yarn which includes the steps of feeding from separate sources at least two differentially dyeable types of bulked, continuous-filament component yarns, each component yarn consisting essentially of filaments of the same dyeable type and being substantially free of yarn twist and of filament entanglement, into a trnasverse-impingement fluid-jet filament intermingling zone with at least 5% overfeed and collecting the resulting heather-dyeable combined yarn, wherein the improvement comprises differentially overfeeding a component yarn of one type, which type consists essentially of filaments that are lighter dyeing than the filaments in the other yarn types and that comprise from about 20% to about 50% of the total filaments in the component yarns, to the zone at a percent overfeed which is from about 15% to about 45% above the percent overfeed of the other component yarn types and randomly entangling filaments in said zone within and among the component yarns to provide a coherent heather-dyeable combined yarn having a mean separation distance by the lateral pull-apart test of no more than about 1.5 inches.