Abstract: A method for manufacturing a plastic fuel tank including: a) inserting a plastic parison including two distinct parts into an open two-cavity mold; b) inserting a core, bearing at least part of a reinforcing element configured to create a link between the two parison parts, inside the parison; c) pressing the parison firmly against the mold cavities, for example by blowing through the core and/or creating suction behind the cavities; d) fixing the part of the reinforcing element to at least one of the parison parts using the core; e) withdrawing the core; f) closing the mold, bringing its two cavities together to grip the two parison parts around their periphery to weld them together; g) injecting a pressurized fluid into the mold and/or creating a vacuum behind the mold cavities to press the parison firmly against the mold cavities; and h) opening the mold and extracting the tank.

Abstract: Method for manufacturing a plastic fuel tank by moulding a parison in a mould, in which method the parison is locally deformed during moulding of the parison in order to obtain an impermeable hollow built-in connector provided with a screw thread, and to do so by means of a concave counter-form and a convex form that can penetrate the counter-form, these two pieces being secured, one to the mould and the other to a core located inside the mould, or vice versa, and at least one of these pieces being provided with a screw thread, the moulding of the connector taking place by the convex form penetrating the concave counter-form.

Abstract: A method for manufacturing a plastic fuel tank including a built-in neck, by molding a parison in a mold. The neck is molded by locally deforming the parison using a concave counter-form and a convex form configured to enter the counter-form, these two parts being secured one of them to the mold and the other to a core located inside the mold, or vice versa.

Abstract: Process for manufacturing a plastic hollow body, the process comprising the following steps: a) a tubular stream of molten plastic is extruded; b) this stream is taken up by means of a tensioning device; c) a transverse cut is made in this stream so as to create a parison having one free edge that is not taken up by the tensioning device; d) the parison is moved relative to the tensioning device so that the free edge of the parison is also taken up by the tensioning device; and e) at least one longitudinal cut is made in the parison over its entire length. Equipment suitable for implementing this process.

Abstract: Process for manufacturing a fuel tank provided with internal accessories, based on a plastic parison, which is split or in at least two parts, in which process, the accessories are positioned on the parison while it is being moulded, using a core (1) forming part of a mould which also comprises dies (2a, 2b), and in which process, the core is able to move in a controlled manner at a variable speed and/or between optional stop positions of variable duration.

Abstract: Method for fastening an accessory (2) at at least two points of a wall of a plastic fuel tank, this fastening taking place during the actual manufacture of the tank by molding. According to this method, the accessory (2) is provided, at least at one of its fastening points, with a fastening part (1, 1?) in such a way that the accessory (2) is fastened to the wall of the tank and can move relative to the corresponding fastening point on the wall of the tank (3).

Abstract: Method for manufacturing a plastic fuel tank by moulding a parison in which, during the moulding operation, a pipe (3) is attached to the parison at least two points, the said pipe being deformable.

Abstract: Method for stake-fastening an accessory (4) into a plastic fuel tank, whereby:—the accessory (4) is equipped with at least one orifice (5) which passes right through the accessory (4); —at least some of the plastic of which the wall of the tank (1) is made is melted; and—some of the molten plastic is forced through the orifice (5) of the accessory without becoming detached from the remainder of the molten plastic; —the protruding molten plastic is given an appropriate shape (8) to obtain a self-formed plastic rivet, and is left to solidify; the size and shape of the orifice (5) and/or of the solidified plastic (8) being such that the accessory (4) is mechanically fastened to the tank by at least some of the solidified plastic (8), the stake-fastening of the accessory (4) occurring at the time of manufacture of the tank (1) through the moulding of a split or at least two-part parison.

Abstract: A process and device for extrusion/molding of thermoplastic hollow bodies using at least one extruder and at least two molds and including the extrusion of a flow of material, its cutting into parisons, and the molding of the parisons to produce the hollow body, alternately in the first mold and then in the second mold. The process may work in parallel for certain of its operations. The process and the device are well suited for producing hollow bodies of complex three-dimensional geometry with a high productivity.

Abstract: A method for fixing a component onto a plastic fuel tank produced as a single piece by molding. In the method a parison is introduced into a mold; the parison is pressed against the mold; at least part of the component is introduced into the parison and secured thereto; the tank is removed from the mold; an opening is made in the tank; the part of the component is detached from the tank through the opening; and this part of the component is fixed to the opening of the tank by an assembly member.

Abstract: Device and associated method for attaching a component (1) to a hollow body with a wall (4) made of plastic of multilayer structure comprising at least one layer of barrier material (5), the device comprising one or more O-ring seals (6) arranged in a groove formed at the periphery of the component (1) or in the wall (4) of the hollow body, at least one of the O-ring seals (6) being compressed radially and being in contact with the layer of barrier material (5). Fuel system for motor vehicles comprising a tank and at least one component (1) attached to the tank by this device.

Abstract: Injection-moulded plastic flange for mounting accessories, in order to close off an opening in a hollow thermoplastic body, which flange has a thread on its periphery. Process for manufacturing a fuel tank comprising such a threaded flange on which at least one accessory is mounted by placing a compressible seal around the periphery of the flange, by making the flange and the seal bear on the perimeter of the opening in a shell, by screwing a ring onto the thread of the flange and by welding the shell to at least one other shell in order to obtain a tank.

Abstract: Process and device for the extrusion-moulding of hollow bodies made of a thermoplastic, comprising the extrusion of a tubular parison, its deposition via the use of a robot arm in a preforming device which takes it into a lower part of a mold in which the parison is blow-molded in order to produce the hollow body. Certain steps of the process may be carried out in parallel. This process and this device are very suitable for producing hollow bodies of complex three-dimensional geometry with a high productivity.

Abstract: Process and device for the extrusion-moulding of hollow bodies made of a thermoplastic, comprising the extrusion of a tubular parison, its deposition via the use of a robot arm in a preforming device which takes it into a lower part of a mould in which the parison is blow-moulded in order to produce the hollow body. Certain steps of the process may be carried out in parallel. This process and this device are very suitable for producing hollow bodies of complex three-dimensional geometry with a high productivity.