The invention relates to a method for producing a container from thermoplastic material having a connection element (5) passing through the wall thereof. The method comprises making available at least one plate-shaped or shell-shaped or tube-shaped preform (3) made of plasticized thermoplastic material, introducing the preform (3) into a multipart molding tool (1) having cavities defining at least one molding recess, molding and final shaping of the preform (3) within the molding tool (1) using differential pressure, piercing of the still warm-plastic preform (3) from the tool side by means of a mandrel (9) in order to produce an opening (6) in the preform (3), insertion from the molding recess side of a connection element (5) into the opening (6) produced by the mandrel (9), and connection of the connection element (5) to the preform (3).

A tool for inflating a chamber (50) in an article composed at least partially of polymer layers, such as thermoplastic layers. The tool can allow for forming an aperture in a polymer layer (350), inflating a chamber (50) or volume (130) in fluid communication with the aperture, and then welding or sealing the chamber (50) so that the inflation fluid is substantially retained in the chamber (50) and/or does not escape via the aperture. In various aspects, the formation of the aperture, inflation of the chamber (50), and sealing of the chamber (50) or aperture can be performed by a single tool and/or based on a single registration of the thermoplastic article with a tool. In some aspects, formation of the aperture is enabled in part by using a punch (100, 201, 205) with a cupped surface (341) that allows the top layer of a thermoplastic article to be breached without forming a hole in at least one lower layer (350).

A method for inflating a chamber in an article composed at least partially of polymer layers, such as thermoplastic layers, is provided. The methods can allow for forming an aperture in a polymer layer, inflating a chamber or volume in fluid communication with the aperture, and then sealing the chamber so that the inflation fluid is substantially retained in the chamber and/or does not escape via the aperture. The formation of the aperture, inflation of the chamber, and sealing of the chamber or aperture may be performed by a single tool and/or based on a single registration of the thermoplastic article with a tool. In some aspects, formation of the aperture is enabled in part by using a punch with a cupped surface that allows the top layer of a thermoplastic article to be breached without forming a hole in at least one lower layer.

A method for inflating a chamber in an article composed at least partially of polymer layers, such as thermoplastic layers. The method can allow for forming an aperture in a polymer layer, inflating a chamber or volume in fluid communication with the aperture, and then welding or sealing the chamber so that the inflation fluid is substantially retained in the chamber and/or does not escape via the aperture. In various aspects, the formation of the aperture, inflation of the chamber, and sealing of the chamber or aperture can be performed by a single tool and/or based on a single registration of the thermoplastic article with a tool. In some aspects, formation of the aperture is enabled in part by using a punch with a cupped surface that allows the top layer of a thermoplastic article to be breached without forming a hole in at least one lower layer.