Hovey Williams LLP
Apparatus for obtaining balanced flow of hot melt in a distribution manifold
An injection manifold has a main runner provided with a supply inlet intermediate opposite ends of the runner. A number of branches intersect with the runner along its length so as to be disposed at unequal distances from the inlet. In order to achieve more simultaneous delivery, uniform fill rate, and identity of temperature of hot melt across all cavities of a multi-cavity set to achieve more uniform cooling of the preforms, restrictor pin assemblies are provided in association with certain of the branches to adjustably constrict the space available for melt flow from the runner into the branch. In a preferred form each restrictor pin assembly includes a pin aligned axially with the branch and passing transversely through the runner, the pin being adjustable between a fully extended, maximum constriction position in which the tip of the pin is located within the branch and a fully retracted, open position in which the tip is withdrawn out of the branch and is spaced below the opening of the branch.
R & D Tool & Engineering Co.
B B B
B29C B29C B29K
inventional additional additional
Jincheng
Chen