Abstract: An apparatus having an extrusion machine and a feeding unit. for producing foamed polymeric material, in particular polyethylene and polypropylene, is disclosed. The extrusion machine includes a cylindrical barrel which is connected with a first end thereof to the feeding unit to receive a blend of plastic material to be extruded, a parallel pair of screws in the cylindrical barrel, a driving unit for driving the screws into rotation in opposite directions, a gas tank containing CO2 as a foaming gas, injection means for injecting the foaming gas into the cylindrical barrel; a head mounted at a second end of the cylindrical barrel opposite to the first end and heating means arranged around the cylindrical barrel for transferring heat thereto.

Abstract: A plastic internally hollow body has a cavity for containing liquids, solids or gases, and includes a main body shaped and having an inner surface at least partially defining the cavity. The inner surface terminates in a shaped edge that delimits a coupling aperture to the cavity. The internally hollow body includes a closure body, having an outer sealing surface suitable at least partially engaging the inner surface of the main body. The closure body at least partially closes the cavity in correspondence of the coupling aperture. The main body is joined to the closure body at least partially along the shaped edge by a joining element over-moulded to the main body and the closure body and covering the over-moulding seat resulting between the main body and the closure body. A method for making the internally hollow body over-moulds the joining element by injection moulding with an over-moulding mould.

Abstract: A plastic, internally hollow body has a cavity for containing liquid, solid or gaseous material and comprises a shaped main body and a closure body joined together by a joining element, overmolded to the main body and to the closure body. A method for producing the internally hollow body provides for joining the main body and the closure body in the same step wherein a second closure body and/or of a second main body to be used in a subsequent union step are molded to obtain a second internally hollow body. The internally hollow body is molded by means of a mold comprising punch impressions and die impressions and a movable shaped element which engages with the punch or with the die and which is movable to transfer the first main body from a main die or a punch impression to a union impression of a die or punch.

Abstract: A plastic internally hollow body has a cavity for containing liquids, solids or gases, and includes a main body shaped and having an inner surface at least partially defining the cavity. The inner surface terminates in a shaped edge that delimits a coupling aperture to the cavity. The internally hollow body includes a closure body, having an outer sealing surface suitable at least partially engaging the inner surface of the main body. The closure body at least partially closes the cavity in correspondence of the coupling aperture. The main body is joined to the closure body at least partially along the shaped edge by a joining element over-moulded to the main body and the closure body and covering the over-moulding seat resulting between the main body and the closure body. A method for making the internally hollow body over-moulds the joining element by injection moulding with an over-moulding mould.