Patent ID: 7887318

Claim:
A resin injection mold assembly having a mold cavity for molding a flange of a tape reel assembly around which a recording tape is wound and which comprises a reel hub forming a cylindrical tape-winding core and at least one flange coaxially secured to, and extending radially outwardly from one of opposite axial ends of said reel hub, said flange having a tapered inside surface sloping down at a fixed taper angle from an inside periphery to an outside periphery thereof, said resin injection mold assembly comprising: a lower mold having a mold surface for bordering at least a lower part of said mold cavity which configures an outside surface of said flange; and an upper mold having a mold surface for bordering at least an upper part of said mold cavity which configures said tapered inside surface of said flange; wherein said mold surface of said upper mold comprises a plurality of flat surface sections sloping at different taper angles gradually decreasing from said inside periphery to said outside periphery so as to be convex to said mold cavity.