초록 ▼

Apparatus for unit cavity and multi-cavity, multi-layer injection molding and injection blow-molding machines are provided, which in preferred embodiments, include one or more co-injection nozzle means each having a central channel, at least two passageways having associated orifices which communica

Apparatus for unit cavity and multi-cavity, multi-layer injection molding and injection blow-molding machines are provided, which in preferred embodiments, include one or more co-injection nozzle means each having a central channel, at least two passageways having associated orifices which communicate with the central channel and valve means operative in the central channel and movable to block and unblock the orifices. The valve means preferably comprise an elongated sleeve having an axial central passageway and a port in its side wall and an elongated pin axially-reciprocable within the sleeve central passageway. The sleeve and pin are mounted in close tolerance slip fit relationship to prevent significant accumulation of polymer melt material therebetween. Preferably, each coinjection nozzle has a gate at one end and at least three passageway orifices, the first more proximate the gate than the others, the third operative at a position more remote from the gate than the first, and the second located between the first and third. In one embodiment, the valve means in one position blocks the second orifice while it does not block the first or third orifice or both the first and third orifices.

대표청구항 ▼

Apparatus for a multi-layer injection molding machine, which comprises a co-injection nozzle having a gate at one end, a central channel in communication with the gate, at least three polymeric melt material flow stream passageways in communication with the central channel, each passageway having an

Apparatus for a multi-layer injection molding machine, which comprises a co-injection nozzle having a gate at one end, a central channel in communication with the gate, at least three polymeric melt material flow stream passageways in communication with the central channel, each passageway having an associated orifice whereat the passageway communicates with the central channel, wherein the first of said orifices is more proximate the gate than said other orifices, the third of said orifices is operative at a position more remote from the gate than said first orifice, and the second of said orifices is located between the first and third orifices, and valve means moveable in the co-injection nozzle central channel, operative with respect to said orifices and adapted to block and unblock and prevent and allow the flow of polymeric melt material through the orifices into said central channel, said valve means being adapted to in one position block said second orifice while it does not block the first or third orifice or both the first and third orifices.