Composite closure member

In a reusable, composite container closure member, the combination of:

• (a) a continuous rim formed from an injection molded, thermoplastic material and comprising:
• (i) a laterally disposed shelf;
• (ii) a skirt depending from said shelf for engagement with a wall of a container body;
• (iii) a recess;
• (b) a central panel, formed from a blank of generally flexible sheet material such as paperboard, and having a fluted marginal portion presenting a plurality of circumferential spaced, radially extending, alternately disposed ridges and grooves;
• (c) said panel marginal portion being disposed within the recess of said rim and bonded thereto by the material of said rim with part of said material received in the grooves of said marginal portion.