Injection molding of cable ties.

摘要

A cable tie (10) having a tongue (12) with ratchet teeth (22. 24) on opposite broad sides (14. 16) of the tongue and two stationary teeth (42) on an abutment surface (30) opposite a hinged pawl (28) within a locking head opening (26) is injection molded by combining a first mold part (50) defining a portion of a mold cavity (54) that forms a first set of ratchet teeth (22) on the one broad side (14) of the tongue and a second mold part (52) that defines a portion of the mold cavity that forms a second set of ratchet teeth (24) on the other broad side (16) of the tongue. The second mold part includes a core (56) that defines at least a portion of the mold cavity that forms the opening in the locking head (18); and the first mold part is combined with the core of the second mold part at an interior parting surface (58) that is remote from the portion (60) of the mold cavity that forms the apexes (46) of the stationary teeth. The solidified tie is ejected from the opened mold without separating the mold parts at any portion of the mold cavity that forms an apex of the stationary teeth.