S.i.p.a. Societa' Industrializzazione Progettazione E Automazione S.p.a.

Giancarlo Besa

Matteo Zoppas

Alberto Armellin

Michele Varaschin

A method for increasing the injection speed of a melted plastic injection device for injecting said melted plastic into a molding cavity (), said injection device comprising a first cylinder () provided with a tubular casing () defining a first inner diameter d, and a first piston () slidable inside said tubular casing (), adapted to be loaded with melted plastic and to inject said melted plastic toward the molding cavity (); a second cylinder () constrained to the first cylinder () and provided with a second piston () which rod () is connected to the first piston () and is adapted to actuate said first cylinder () during an injection operation; the method comprising the steps of: &#x2014;releasing second cylinder () and first cylinder () by extracting the first piston () from the tubular casing (); &#x2014;coaxially inserting a tubular body (), defining a second inner diameter dwhich is smaller than the first inner diameter d, into the tubular casing (); &#x2014;disconnecting the first piston () from the rod (); &#x2014;connecting a third piston () to the rod (), said third piston () being sized to slide inside said tubular body (); &#x2014;constraining second cylinder () and first cylinder () by inserting the third piston () into the tubular casing ().

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Orsago, Italy

Giancarlo Besa