Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...
Patent
1983-04-13
1987-12-15
Silbaugh, Jan H.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
264 451, 264513, 264255, 2643288, 425523, 425564, B29C 4516, B29C 4522, B29C 4922
Patent
active
047129905
ABSTRACT:
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.
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Iwawaki; Kijima, Shitara; Multi-Layer Blow Molding Technique Using Ring Piston Accumulator.
Kudert Frederick G.
Latreille Maurice G.
McHenry Robert J.
Nahill George F.
Pfutzenreuter, III Henry
American Can Company
Audet Paul R.
Durkin II Jeremiah F.
Silbaugh Jan H.
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