Abstract: A closable opening device (2) having a frame (15) defining a through hole (16) and fitted about a pierceable portion (4) of a sealed package (1) for pourable food products; a removable cap (17) cooperating with the frame (15) to close the hole (16); and a substantially tubular cutting member (18) engaging, in use, the hole (16) in angularly and axially movable manner, and having an end edge (40) in turn having, on the face, cutting means (41) cooperating with the pierceable portion (4) to open the package (1); the frame (15) and the cutting member (18) are molded in one piece in a preassembly configuration, wherein they are secured coaxially to each other by breakable connecting means (62).

Abstract: A closable opening device (2) having a frame (15) defining a through hole (16) and fitted about a pierceable portion (4) of a sealed package (1) for pourable food products; a removable threaded cap (17) which screws onto the frame (17) to close the hole (16); and a tubular cutting member (18), which engages the hole (16) in movable manner along a spiral feed path, is connected angularly to the cap (17) during disengagement of the cap (17) from the frame (15) when first opening the package (1), and has an end edge (40) in turn having, on the face, a single cutter (55) acting along a major portion (C) of the periphery of the pierceable portion (4) to open the package (1).