Core - The central member
of a sandwich construction (can be honeycomb material,
foamed plastic, or solid sheet) to which the face of
the sandwich are attached; the central member of a plywood
assembly. (2) A channel in a mold for circulation of
heat-transfer media. (3) Part of a complex mold that
molds undercut parts. Cores are usually withdrawn to
one side before the main sections of the mold open.
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