Reducible-diameter center made of injection-molded plastic for the formation of spools of yarn for dyeing and other treatments

摘要

An injection moulded yarn spool has a cylindrical centre section (51) provided with rows of elongated slots (53), each row staggered relative to adjacent rows where each end of the cylindrical section (51A:51B) has an annular section of reduced thickness (55:155) formed of aligned indentations (59A:61:62) :(159A:161:162) and ribs (59:65):(159:165).