Modular die set for blow molding containers

Abstract

A modular die system is disclosed for use in blow molding an extruded plastic parison to form container members of essentially similar design but differeing dimensionally. Through use of composite die sets having modular elements, containers of different capacities can be molded without requiring complete die sets for each individual container size. That is, die elements used in molding a container member of one size may also serve in molding container members of a different size. This capability is achieved through break-down of the usual integral, cavity-defining die halves of a split die set into a plurality of die elements so selected that each of them controls but two of the three dimensions of the die cavity. Provision is made for substituting different die elements in the composite die sets and for securing these together on the platens of a blow molding press. The system simplifies tooling inventory and cost, especially in the manufacture of larger containers having a base or tray and hinged cover or lid, where the tray and lid are of congruent form but differ in their "hardware" configurations to provide non-identical but complementary hinge and latch formations, handle provisions, and the like.

Dependencies are inferred from the claim text.