Patent ID: 7132076

Claim:
A mold for blow molding having a base component for forming at least one portion of a concave base of a blow molded container, the base component comprising a mounting plate having connections for supply and return of a heat transfer fluid, a body having a molding surface defining the shape of the at least one portion of a concave base of the container and a mounting surface substantially opposite the molding surface and having a recess therein having a floor spaced from the molding surface, at least two channels located in the body, each channel comprising an inlet end and an outlet end, at least one channel located in the floor of the recess and lying proximate a portion of the molding surface, at least one channel located in the mounting surface, the inlet end thereof intersecting the recess and connecting to an inlet in the body for conducting heat transfer fluid thereinto, the outlet end thereof intersecting the recess and connecting to an outlet in the body for conducting heat transfer fluid therefrom, the channel in the mounting surface being located at a depth relative to the mounting surface less than the depth of the channel in the floor of the recess, an insert receivable in the recess and defining a communicating passage between an inlet end of at least one channel in the mounting surface and an inlet end of at least one channel in the floor of the recess and a communicating passage between an outlet end of at least one channel in the floor of the recess and an outlet end of at least one channel in the mounting surface, whereby heat transfer fluid is conducted serially through the inlet ends of the channels to progressively greater depths and serially through the outlet ends of the channels to progressively lesser depths.