Mold cavity-defining die assembly to produce formed millwork products having interior stiffening ribs

摘要

A mold cavity-defining die assembly includes lower and upper molds adapted to be disposed against one another. The lower mold has an inner surface defining an outer side of a mold cavity and forming an outside wall of a formed millwork product produced in the mold cavity. The upper mold supports an array of core members such that the core members protrude into the mold cavity so as to define an inner side of the mold cavity and form an inside wall and interior ribs of the product such that the inside wall and interior ribs together provide sufficient surface area to ensure that the product clings to the upper mold and core members and releases from the lower mold upon separation of the molds from one another.