Arrangement for spraying plastic into cavity of plastic spraying machine, has valves comprising respective intake and return-flow pipes, where pipes are connected with source and container over inlet and return manifolds, respectively

摘要

The arrangement (1) has needle closure nozzles arranged on a clamping plate and operated by respective operating units (4a, 4b). Each nozzle has a cylinder (10) and a piston (12) loaded with pressure fluid of a pressure fluid source (52) for moving closure needles (16) toward an injection mold. The operating units comprise respective valves (8a, 8b), and intake pipes (P-1, P-2) of the respective valves are connected with the source over an inlet manifold (P). Return-flow pipes (T-1, T-2) of the respective valves are connected with a supply container over a return manifold (T).