Patent ID: 6135751
Filing Date: 2000-10-24
Classification: B29C

Abstract:
A melt dividing bushing having a side surface extending from a rear end to a front end for use in a multi-cavity hot runner injection molding apparatus having a plurality of heated nozzles mounted in a mold, for dividing a melt passage extending therethrough from a single inlet to four outlets at the front end thereof, the melt dividing bushing comprising at least first, second and third layers integrally joined together, the first layer having a rear face and a front face, the third layer having a rear face, a front face and four spaced holes extending therethrough from the rear face to the front face, the second layer having a rear face, a front face and two spaced holes extending therethrough from the rear face to the front face, the rear face of the second layer abutting against the front face of the first layer, the front face of the second layer abutting against the rear face of the third layer, the front face of the first layer and the rear face of the second layer having matching grooves which form a first melt conduit which branches from the single inlet to the two spaced holes extending through the second layer, and the front face of the second layer and the rear face of the third layer having matching grooves which form two second melt conduits, each of said second melt conduits branching from one of the two spaced holes through the second layer to two of the four spaced holes extending through the third layer, whereby the melt passage extends from the single inlet through the first melt conduit, the two spaced holes through the second layer, the two second melt conduits and the four spaced holes through the third layer.