Pin in barrel injection molding nozzle using short pin

摘要

An apparatus for injecting a viscous fluid and a non-viscous fluid into a mold cavity of a mold body includes a nozzle body having a discharge end a flow passage for the viscous fluid extending to the discharge end. A valve element is mounted for reciprocation in the nozzle body flow passage to control the flow of the viscous fluid through the nozzle body discharge end. The valve element includes a barrel having a first end and a second end and a first bore extending longitudinally in the barrel. A tip is detachably secured to the barrel first end for selectively engaging a portion of the nozzle body discharge end to prevent a flow of the viscous fluid therepast. The tip has a first end, a second end and a second bore extending longitudinally through the tip from the first end to the second end. A pin is located in the second bore. The pin has a first end located adjacent the tip first end, such that the pin and the tip define between them an annular opening at the tip first end. The annular opening communicates with the barrel bore. The pin also has an enlarged diameter section which is selectively securable between the tip and the barrel. The pin can be removed from the barrel when the tip is detached from the barrel.