Abstract: Process for reinforcing a plastic fuel tank comprising a wall defining an internal closed volume, according to which a structural member is fixed to the wall of the tank outside the closed volume, in at least two points being located in two different portions of said wall where a deflection induced when the tank is filled with fuel, is low; and said structure having at least one contact point with the tank wall in a portion of said wall where the deflection is high.

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 at least two points, the said pipe being deformable.

Abstract: Fuel tank or filler pipe for this tank comprising a multilayer wall constituted at least of one layer based on a reinforced thermoplastic composition and of one inner layer, intended to be in contact with the fuel, based on a non-reinforced thermoplastic composition. Use of such a tank/pipe in a hybrid vehicle.

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: Plastic fuel tank having a lower wall, an upper wall and at least one reinforcing element connecting these two walls, this reinforcing element comprising a hollow plastic pillar having an opening in its lower part and an opening in its upper part, these openings being situated at locations such that they allow, respectively, the filling of the pillar and the degassing thereof, at least one part of the hollow pillar being a constitutive element of an accessory that has an active role in the tank.

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: Process and device for manufacturing a plastic fuel tank equipped with at least one communication component, by molding a parison using a mold comprising two impressions and a core, said process comprising the pressing of the parison against the impressions and formation of a pocket in this parison, the communication component being fastened in this pocket by welding of at least one portion of its side wall to at least one portion of the side wall of the pocket.

Abstract: A process for manufacturing a plastic hollow body by molding a molten plastic parison, which is extruded vertically through a die, in a mold comprising two complementary cavities, characterized in that the die is adjusted so that the shape of the parison matches that of the mold cavities. A die suitable for such a process.

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 plastic fuel tank equipped with a component, by molding a parison using a mold comprising two cavities and a core, the process comprising the mounting of a component around a needle or an oblong object attached to the core, the displacement of the needle or oblong object so as to deform the parison and pierce an opening into it, the needle or oblong object carrying the component with it in order to position the component in the opening, and the withdrawal of the needle/oblong object, leaving the component lodged in the opening.

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 plastic fuel tank (FT) equipped with an internal accessory, by molding a parison using a mold comprising two cavities and a core, said process comprising the following steps: the parison is introduced into the mold cavities; the core is introduced inside the parison, the core having first been fitted with the accessory; the mold is closed so that the cavities come into leaktight contact with the core; the parison is pressed against the cavities by blowing through the core and/or applying a vacuum behind the cavities; the accessory is fastened to the parison by snap riveting using a device attached to the core; the mold is opened to withdraw the core; and the final molding of the parison is carried out by blow molding and/or thermoforming.

Abstract: Process for fastening an accessory to a hollow body obtained by molding a molten plastic parison, this fastening taking place by snap-riveting with the aid of a tool during the actual molding of the parison, according to which, before carrying out the snap-riveting, the parison is locally deformed so as to surround the snap-riveting zone with a dome, the snap-riveting zone being also in relief (hollow) compared to the rest of the accessory.

Abstract: Process for fastening an accessory to a hollow body obtained by molding a molten plastic parison and using a plastic connector comprising coupling means for the accessory and a stop surface intended to limit the penetration of the connector into the molten plastic, according to which the stop surface is provided with a curved double lip (or one-piece part having two concentric curved edges, i.e., two protuberances located preferably at its periphery, which are concentric and are in relief relative to the remainder of the part) and the connector is welded to the inner wall of the parison using this double lip.

Abstract: Process for manufacturing a plastic fuel tank equipped with an internal line by molding a parison using a mold comprising two cavities and a core, comprising the following steps: introducing the parison into the mold cavities; introducing the core inside the parison, said core having first been fitted with the line; closing the mold so that the cavities come into leaktight contact with the core; pressing the parison against the cavities by blowing through the core and/or applying a vacuum behind the cavities; fastening the line to the parison over at least two points using a device attached to the core; opening the mold to withdraw the core; and carrying out the final molding of the parison by blow molding and/or thermoforming, in which the line comprises, between its fastening points, a free length that is capable of coming into contact with the parison and/or with an accessory found thereon when the mold is closed, and wherein during the fastening step, at least one intermediate fastening point is created u

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: Method for producing a fuel tank provided with internal accessories and having a wall made of plastic made in a single piece by moulding a split parison or a parison in at least two parts, said method comprising the following steps: a) the parison is introduced in the heat-softened state into a mould comprising dies; b) a core on which the accessories are placed is introduced inside the parison; c) the parison is pressed onto the dies of the mould; d) the accessories are fastened to the parison with the aid of the core in an ideal layout; e) the core is withdrawn and the mould is closed; f) the tank is moulded from the parison; and g) the tank is removed from the mould.

Abstract: Process for manufacturing a plastic hollow body, said process comprising the following steps: a) a molten plastic parison is extruded, in an extruder, through a die; b) at least one longitudinal cut is made in the parison; c) the parison is introduced into a mould comprising two cavities; and d) the hollow body is moulded by conforming the parison to the mould cavities, said die being equipped with a passage for the molten plastic which gradually modifies the shape of the parison so that it is substantially flattened on exiting. Die suitable for implementing this process.

Abstract: A method for connecting a tubular part made of plastic to a neck of a fuel tank also made of plastic, by welding using a resistive element heated by a resistive effect. The shape and dimensions of the two parts to be connected are chosen such that one surface of each part is up against a corresponding surface of the other part. The resistive element is incorporated into one of the two surfaces, the two surfaces are brought into contact, and an electric current is passed through the resistive element at an intensity to allow the resistive element to be heated to a temperature high enough to melt the plastic of the two surfaces to weld them together. The tubular part and neck each include a barrier layer and are welded such that the two contact surfaces are coaxial and the barrier layers in the weld region are parallel.

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.