| 摘要 |
Self-opening plastic closures having a pouring spout including a flange, a cutting member that is moveable in the spout and a screw cap for actuating the cutting member. In this invention, the cutting member carries out a translatory cutting motion by the rotational movement of the screw cap. In order to open the sealed packaging, to which the plastic closure is attached, different torques are brought to bear. According to this invention, first means and second means engage with one another successively to produce different advance paths for each revolution of the screw cap. |
