Closure device

A product container provided with a closure device, said closure device comprising a base having a body with a connector portion mounted on the product container, said base comprising a product channel in the body of base,

• wherein a rupturable seal occludes the product channel and forms a lower seal,
• wherein the closure device comprises a rotary part that is rotatably journalled on the base,
• wherein the rotary part has a product passage in communication with the product channel,
• wherein the closure device comprises an upper sealing arrangement arranged on the rotary part and forming an upper seal that is remote from the lower seal and seals the product passage of the rotary part,
• wherein the closure device comprises a lower seal rupturing member, which is movable in a rupturing motion relative to the base to rupture the rupturable lower seal,
• wherein the closure device comprises a motion transfer means adapted so as to effect the rupturing motion of the lower seal rupturing member upon suitable rotary actuation of the rotary part,
• wherein a protective overcap is provided that is removable by the user,
• wherein the upper sealing arrangement is in closed condition prior to first time removal of the overcap,
• wherein the overcap is connected to the base and is adapted to be rotated by the user with respect to the base in order to remove the overcap from the base,
• wherein the overcap engages on the rotary part so as to cause rotary motion of the rotary part upon removal of the overcap, so that the lower seal rupturing member effects the rupturing motion to rupture the rupturable lower seal and thereby open the product channel by user removal of said overcap,
• and wherein the upper sealing arrangement is adapted to remain in closed condition during the process of removal of the overcap.