摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
The invention relates to a system for preforming an extruded plastics parison including a nonplanar conveyor belt. It also relates to a method for preforming an extruded parison, including a step during which the parison is deposited on a conveyor belt. The conveyor belt is not planar. This step may be accompanied by a step in which the parison undergoes transverse deformation. The invention also relates to a method of manufacturing at least one article, including such a preforming step.
摘要:
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.
摘要:
Composite article comprising an injected hollow body or a solid body based on at least one plastic A, reinforced by at least one bundle of continuous reinforcing fibers, the bundle being wound externally at its surface, substantially perpendicular to its axis, as well as by reinforcing fibers dispersed within it, substantially parallel to its axis, and continuous process for manufacturing it.
摘要:
The flexible multilayer structures comprise a layer of vinylidene chloride copolymer bonded to a layer of plasticized vinyl chloride polymer with the aid of a polymeric adhesive consisting of a mixture of vinyl acetate polymer and of polymethyl methacrylate, for which the product of the vinyl acetate weight content, expressed in per cent, multiplied by the dynamic viscosity at 100.degree. C. and 1 s.sup.-1, expressed in kPa s, is greater than 1.3.times.10.sup.3.The flexible multilayer structures may be in the form of films, sheets, cartons or flexible pouches which can be employed in the packaging field.
摘要:
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.