Apparatus for injection molding and injection blow

专利名称：Apparatus for injection molding and injection

blow molding multi- layer articles

发明人：Frederick G. Kudert,Maurice G.

Latreille,Robert J. McHenry,George F.Nahill,Henry Pfutzenreuter, III,William A.Tennant,Thomas T. Tung,John Vella, Jr.

申请号：US06/484707申请日：19830413公开号：US04712990A公开日：19871215

摘要：Apparatus for unit cavity and multi-cavity, multi-layer injection molding andinjection blow-molding machines are provided, which in preferred embodiments, includeone or more co-injection nozzle means each having a central channel, at least twopassageways having associated orifices which communicate with the central channel andvalve means operative in the central channel and movable to block and unblock theorifices. The valve means preferably comprise an elongated sleeve having an axial centralpassageway and a port in its side wall and an elongated pin axially-reciprocable within thesleeve central passageway. The sleeve and pin are mounted in close tolerance slip fitrelationship to prevent significant accumulation of polymer melt material therebetween.Preferably, each coinjection nozzle has a gate at one end and at least three passagewayorifices, the first more proximate the gate than the others, the third operative at aposition more remote from the gate than the first, and the second located between thefirst 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.

申请人：AMERICAN CAN COMPANY

代理人：Paul R. Audet

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