Patent ID: 6382946
Filing Date: 2002-05-07
Classification: B29C

Abstract:
A multi cavity nozzleless coinjection mold for simultaneously producing a plurality of multi-layered articles corprising:a mold structure defining a plurality of mold cavities; a first supply source for suppling a first molding material; a second supply source for suppling a second molding material; a hot runner system in communication with said first and second supply sources for conveying metered quantities of said first and said second materials separately to a region proximate each cavity; and each said region comprising a nozzleless contiguous gate and adjacent passage with a reciprocal pin closely housed in the passage, the pin having only two operating positions in a first of which the pin is in a fully retracted position, in which the first and second materials conveyed in metered quantities to the proximate region are allowed to pass sequentially and contiguously through said passage and said gate to the proximate cavity, and in a second of which, at the end of each injection cycle, when the metered quantities of the first and second materials have been conveyed to the passage, the pin is moved into the gate to dose the gate, in which position the pin has ejected the first and second materials remaining in the passage, after conveyance of the metered quantities to the passage into the proximate cavity, the passage and gate having the same cross-section and size without restriction therebetween.