Abstract: A method for manufacturing a hollow body, typically a tank, from a plastic material. The method includes molding a preform into shells in a molding tool; joining an insert to an inner surface of a shell of said shells, the insert defining a sub volume within the hollow body to be made; joining together the shells to form the hollow body by closing the molding tool and applying a main pressure to a main volume enclosed by the shells. It is proposed to apply a sub pressure to the sub volume while applying the main pressure to the main volume, such that a pressure difference between the main volume and the sub volume is bigger than 0.20 bar (P1??P2?>0.20 bar) and smaller than 3.00 bar (P1??P2?<3.00 bar).

Abstract: A process for manufacturing a plastic hollow body by molding two sheets of molten plastic in a mold including two cavities, the process including: a) two molten plastic sheets are manufactured by extrusion of at least one stream of molten plastic and transverse cutting thereof; b) these sheets are introduced between the mold cavities; c) the mold is closed and the hollow body is manufactured by conforming the two sheets to the mold cavities; d) the hollow body thus obtained is removed from the mold; e) all of operations a) to d) are repeated to manufacture another hollow body from two new sheets; and before, during, or after the transverse cutting operation, the lower portion of the two new sheets is cooled using a specific device that makes possible a local cooling of the sheets in the lower portion.

Abstract: A method for manufacturing a hollow body, typically a tank, from a plastic material. The method includes molding a preform into shells in a molding tool; joining an insert to an inner surface of a shell of said shells, the insert defining a sub volume within the hollow body to be made; joining together the shells to form the hollow body by closing the molding tool and applying a main pressure to a main volume enclosed by the shells. It is proposed to apply a sub pressure to the sub volume while applying the main pressure to the main volume, such that a pressure difference between the main volume and the sub volume is bigger than 0.20 bar (P1??P2?>0.20 bar) and smaller than 3.00 bar (P1??P2?<3.00 bar).

Abstract: A process for manufacturing a fuel tank including a thermoplastic wall and a fibrous reinforcement on at least one portion of its outer surface, according to which: a molten thermoplastic parison is molded in a mold and is left to cool in order to obtain a wall of the tank; a fibrous reinforcement is chosen that includes a thermoplastic similar to or compatible with that of the wall of the tank and the reinforcement is heated so as to soften or even melt the thermoplastic of the reinforcement; and the reinforcement is applied to an outer surface of the tank by exerting a force that makes it possible to weld the reinforcement and the outer surface.

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: A process for manufacturing a plastic hollow body by molding two sheets of molten plastic in a mold including two cavities, the process including: a) two molten plastic sheets are manufactured by extrusion of at least one stream of molten plastic and transverse cutting thereof; b) these sheets are introduced between the mold cavities; c) the mold is closed and the hollow body is manufactured by conforming the two sheets to the mold cavities; d) the hollow body thus obtained is removed from the mold; e) all of operations a) to d) are repeated to manufacture another hollow body from two new sheets; and before, during, or after the transverse cutting operation, the lower portion of the two new sheets is cooled using a specific device that makes possible a local cooling of the sheets in the lower portion.

Abstract: A process for manufacturing a fuel tank including a thermoplastic wall and a fibrous reinforcement on at least one portion of its outer surface, according to which: a molten thermoplastic parison is molded in a mold and is left to cool in order to obtain a wall of the tank; a fibrous reinforcement is chosen that includes a thermoplastic similar to or compatible with that of the wall of the tank and the reinforcement is heated so as to soften or even melt the thermoplastic of the reinforcement; and the reinforcement is applied to an outer surface of the tank by exerting a force that makes it possible to weld the reinforcement and the outer surface.

Abstract: Layer made of base plastic comprising, in the dispersed form, nodules with a diameter of less than or equal to one micron comprising barrier plastic incompatible with the base plastic; multilayer structure comprising at least one such layer and process for the manufacture of such layers/structures.

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: Layer made of base plastic comprising, in the dispersed form, nodules with a diameter of less than or equal to one micron comprising barrier plastic incompatible with the base plastic; multilayer structure comprising at least one such layer and process for the manufacture of such layers/structures.

Abstract: Process for manufacturing hollow plastic bodies, especially motor-vehicle fuel tanks, from an extruded parison of closed cross section, in which at least one cut is made in the parison which is then formed by moulding.

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 for manufacturing hollow plastic bodies, especially motor-vehicle fuel tanks, from an extruded parison of closed cross section, in which at least one cut is made in the parison which is then formed by moulding.

Abstract: Process for manufacturing hollow plastic bodies, especially motor-vehicle fuel tanks, from an extruded parison of closed cross section, in which at least one cut is made in the parison which is then formed by molding.

Abstract: Process for manufacturing a plastic fuel tank from two shells formed by molding, which are joined together, at least one shell being produced by compression-molding a portion of a plastic sheet between a mold and a punch and by the remaining portion of the sheet being blow-molded in the region not compression-molded.

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.

Abstract: The invention relates to a multilayer tank or tubing made of a thermoplastic, comprising at least one layer comprising a barrier resin, adjacent to at least one layer consisting of a blend comprising at least one polyolefin and at least one functionalized polyolefin, and the said functionalized polyolefin of which comprises functional monomeric units chosen from carboxylic acids, dicarboxylic acids and the anhydrides corresponding to the said dicarboxylic acids.

Abstract: Multilayer hollow body comprising an inner layer which comprises a conductive compound based on a virgin polyolefin or a virgin polyamide, an outer layer comprising a virgin polyolefin, a layer which is a barrier to hydrocarbons, at least one adhesive and at least one layer comprising recycled plastic. Process for manufacturing this hollow body using the technique of coextrusion blow moulding, comprising a step of extruding a parison, a step of transversely preforming the parison by means of a tool and a moulding step.

Abstract: The invention relates to a multilayer tank or tubing made of a thermoplastic, comprising at least one layer comprising a barrier resin, adjacent to at least one layer consisting of a blend comprising at least one polyolefin and at least one functionalized polyolefin, and the said functionalized polyolefin of which comprises functional monomeric units chosen from carboxylic acids, dicarboxylic acids and the anhydrides corresponding to the said dicarboxylic acids.

Abstract: Process for manufacturing hollow plastic bodies, especially motor-vehicle fuel tanks, from an extruded parison of closed cross section, in which at least one cut is made in the parison which is then formed by molding.