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Shut-off nozzle : ウィキペディア英語版 | Shut-off nozzle
Shut-off nozzles are used in the manufacturing process of plastic injection molding. Machine shut-off nozzles serve as the connection between the plasticizing barrel (with reciprocating screw) and the mold. They are mounted on the machineside of the plastic injection molding process, unlike hot runner nozzles which are mounted on the moldside of the process. Machine shut-off nozzles differ from open nozzles because of their closable melt channel. == Reasons for using ==
Shut-off nozzles are used to avoid drooling of the melt and stringing, as well as to feed with a retracted nozzle.〔Johannaber, Friedrich (2008). ''Injection Molding Machines: A User's Guide.'' Carl Hanser Publishers, Munich. ISBN 978-3-446-22581-7〕
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