“A hot runner system usually includes a heated manifold and a number of heated nozzles. The main task of the manifold is to distribute the plastic entering the mold to the various nozzles which then meter it precisely to the injection points in the cavities.” (Wikipedia 7/31/2009)

“Two main types of hot runner systems are the externally heated and internally heated. In the externally heated type, molten plastic runs within a solid manifold and within the nozzles. In the internally heated, (now obsolete) the plastic flows directly over slender heaters inside oversized runners. The outside boundaries of the runners normally solidify, so the plastic material flows only in proximity of the internal heaters or "torpedoes". A hot runner controller is a temperature controller used to control the temperature in the hot runner. This helps create the most consistent part(s).” (Wikipedia 7/31/2009)

“Hot runner systems were first developed and came into sporadic use in the early 60s with generally negative results. They gained popularity in the 80s and 90s as technological advantages allowed improved reliability and the escalation of plastic materials prices made hot runner systems more desirable and cost effective.” (Wikipedia 7/31/2009) 

Injection Molding
Processing

Recent US Patents

Recent Journal Articles

Comments