| 摘要 |
<p>The present invention regards an opening and closing device for a package (1) comprising a flexible container (2), the device comprising a pourer body (15) associated with an opening and closing cap (16), said pourer body (15) comprising a base (18) intended to associated with said container and provided with a substantially cylindrical through channel (20) with pre-established axis (X), and a coaxial neck (22) provided with cutting means (42) suitable to perforate said flexible container at the first opening thereof, said neck (22) being rotatably engaged and movable in said channel (20) between an upper end stop position wherein said cutting means(42) are situated in said channel (20) in the condition of maximum removal from the container (2) and a lower end stop position wherein said cutting means (42) are in a position of maximum advancement and are capable of perforating said container (2), and being characterised in that said neck (22) comprises an upper end portion provided with outer thread (32) along an axial part thereof in threaded coupling with an inner thread of said cap (16), and a lower end portion (33) provided with outer thread (34) along an axial part thereof in threaded coupling with an inner thread of said channel (20), said thread (32) of the upper end portion (31) and said thread (34) of the lower end portion (33) being made in substantially opposite direction so to allow, at the time of the first opening of said container (2), the perforation of said container and the screwing off of the cap by means of a prolonged rotary movement in one single direction.</p> |
