Abstract: A hot runner molding manifold has a first half having flow grooves, a cover piece having flow grooves complementary to the flow grooves of the first half, and a second half securable to the first half and having a cavity for receiving the cover piece. The flow grooves of the first half and the cover piece form flow channels for distributing molten material from an inlet port to outlet ports. The cover piece is engaged with the first half, for example by welding, to reduce leakage of molten material out of the flow channels. Heater grooves in the first half, second half or both the first and second halves receive one or more heating elements for heating the flow channels.

Abstract: The present invention is a mechanism for folding plastic injection molded parts after the parts have been molded and while the parts are still on the mold core half. The mechanism consists of a mold core half having one or more mold cores. The mold core half has a finger movably mounted adjacent the mold core half and movable along a predetermined path between a first position wherein the finger is clear of the mold core and a second position wherein the finger bears against the part on the mold core so as to fold the part. The invention also includes a drive (either electrical, hydraulic or pneumatic) for driving the finger between its first and second positions. The present invention also consists of a method of in-mold folding of a foldable plastic part. The method consists of projecting a finger across a face of the mold core half and towards the plastic part sitting on the mold core such that the finger engages a lower edge of a first portion of the plastic part.