Method for producing a tube and injection-molding device

A method for producing a tube by injection molding a thermoplastic molding compound while using an injection molding device having an article cavity which defines an external contour of the tube, having an injection device which is configured for driving a projectile through the article cavity that is filled with the thermoplastic molding compound while displacing a liquid core of the molding compound, wherein the method comprises

• introducing the projectile into a first opening of the article cavity;
• closing a second opening of the article cavity, disposed so as to be remote from the first opening, by way of a mold core which together with the article cavity forms a molding cavity and which has a secondary cavity that is fillable with the molding compound, wherein the molding cavity is formed partially in an area between the article cavity and the mold core;
• at least partially filling the article cavity and the molding cavity with the thermoplastic molding compound;
• driving the projectile from the first opening through the article cavity to the second opening while partially displacing the molding compound into the secondary cavity, wherein the projectile is driven toward or into the mold core, and a thin place or a predetermined breaking line is generated between the molding compound that forms the tube and the molding compound that is displaced into the secondary cavity;
• and
• pulling the mold core together with the filled secondary cavity, wherein, by the pulling of the mold core, the displaced molding compound is separated from the molding compound that forms the tube.