LINER INJECTION MOLDING APPARATUS AND CONTAINER LID HAVING INJECTION-MOLDED SYNTHETIC RESIN LINER

摘要

PROBLEM TO BE SOLVED: To provide a container lid having a synthetic resin liner sufficiently good from an aspect of hermetic sealability by obtaining a liner injection molding apparatus capable of molding a good liner sufficiently uniform in its peripheral direction even when a liner to be molded has a ring shape with a relatively large diameter. SOLUTION: A liner injection molding apparatus 14 is provided with an injection molding means 18 including a first mold having a core 30 and a second mold having a housing cavity and a feed means 42 feeding in and out a container lid shell 2 with respect to either one of the core and the housing cavity. An injection-molded synthetic resin liner 12 includes a ring-shaped main portion 38 and a gate portion 40 displaced to the inside or outside in a radial direction from the ring-shaped main portion.