Mold for injection-compression molding

Abstract

A mold (1) for injection-compression molding includes a punch (2) and a matrix (3) suitable to close on the punch (2) to delimit with this an injection chamber (10) to contain the material to be injected. The matrix (3) and punch (2) are axially movable between them with respect to an axial direction (Y-Y) of opening/closing of the mold (1). The mold has a perimetral ring (4) slidingly associated to the punch (2) or the matrix (3), along the axial direction (Y-Y), suitable to define, together with the matrix (3) and the punch (2), the profile of the injection chamber (10). The perimetral ring (4) includes an interface profile (43) engaging with the matrix (3) or with the punch (2), equipped with a particular geometry generating in the closing phase of the mold (1), a compression force of the ring (4) towards the inside of the mold (1).

Dependencies are inferred from the claim text.