Disposable self-opener for opening a tubular bag-cartridge and for pressing out a pasty material from the latter

A disposable self-opener apparatus for opening a tubular bag cartridge and squeezing a pasty composition therefrom, comprising:

• a conical tube shoulder having an orifice with said conical tube shoulder being made via a plastic molding procedure;
• a screw cap associated with one end of a tube portion of said conical tube shoulder;
• a self-opener device screwable with said screw cap for joining said self-opener device with said one end of said tube portion of said conical tube shoulder, said self-opener device having gable-shaped pairs of cutting edges on an inner side with peaks of said gable-shaped pairs of cutting edges pointing in a direction of screwing;
• and,
• a retainer basket for receiving a metal clip of a tubular bag cartridge to be opened is centrally located on the inner side of said self-opener device, so that the metal clip does not enter a nozzle attached to the orifice of the conical tube shoulder for dispensing a pasty composition, thereby preventing the metal clip from obstructing a flow of the pasty composition through the nozzle.