Procedure to manufacture a rigid recipient of multiple layers. The flowers of polymers for the interior and exterior superficial layers and the soil layer of the walls of the container are virtually injected in a simultaneous way in a cavity of mold of the parison through an injection nozzle which has separate ducts for each casting of polymer provided to drive until holes of coaxial annular nozzles surrounding the central hole. Also additional layers or layers can be injected between surface and soil layers simultaneously to produce a wall of a recipient that has four or more layers. (Machine-translation by Google Translate, not legally binding)
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