| 摘要 |
A melt transfer system is provided for a stack mold. The melt transfer system includes first and second transfer bushings (62, 66) arranged in opposing platens (30, 32) of the mold. Each transfer bushing (62, 66) defines a portion of a runner passage (42, 44) communicating at shear gates (48, 50) disposed in a shearing surface (94) that is parallel to the direction of opening and closing movement for said platens in order to shear the melt when the platens are moving from a closed position to an open position. In another aspect, the shearing surfaces (94) are normal to the direction of movement of the platens and at least one of the transfer bushings is rotatable relative to the platen for shearing the melt. In another aspect, a transfer bushing (62, 66) is provided having a core (97) formed of an insulative material and a shell (95) formed of a conductive material. The core (97) defines a channel (98) for conducting melt between a shear gate (48, 50) at one end of the channel (98) and an aperture at another end of the channel (98). |
