Injection molded articles and mold apparatuses for forming same

An injection molded article comprising:

• a) an article first portion having internal threading extending helically about an article axis, the threading configured to be formed by a thread mold in a mold core;
• and
• b) an article second portion spaced radially apart from the article first portion and connected to the article first portion by a connection portion, the article second portion having at least one ejection-assist rib configured to be formed by at least one rib mold feature in the mold core, the ejection-assist rib defining a helical slide surface extending helically about the article axis, wherein during an initial unscrewing rotation of the molded article relative to the mold core, the rib mold feature of the mold core bears against the slide surface of the ejection-assist rib to urge the article second portion axially away from the mold core during ejection of the molded article from the mold core;
• wherein the article second portion includes at least one retaining feature projecting axially along the article axis and configured to be formed by a retaining mold feature in the mold core, and wherein the retaining feature comprises a protrusion radially adjacent the ejection-assist rib.

An injection molded article comprising:

• a) an article first portion having internal threading extending helically about an article axis, the threading configured to be formed by a thread mold in a mold core;
• and
• b) an article second portion spaced radially apart from the article first portion and connected to the article first portion by a connection portion, the article second portion having at least one ejection-assist rib configured to be formed by at least one rib mold feature in the mold core, the ejection-assist rib defining a helical slide surface extending helically about the article axis, wherein during an initial unscrewing rotation of the molded article relative to the mold core, the rib mold feature of the mold core bears against the slide surface of the ejection-assist rib to urge the article second portion axially away from the mold core during ejection of the molded article from the mold core;
• and
• wherein the article second portion comprises two said ejection-assist ribs, and wherein the helical slide surface of each rib extends continuously over a circumferential arc of 180 degrees.