TUBO DE MATERIAL PLASTICO MULTICAPA COEXTRUIDO

LA INVENCION SE REFIERE A UN TUBO DE PLASTICO DE MULTIPLES CAPAS COEXTRUIDAS QUE COMPRENDE UN TUBO INTERIOR (1) Y UN TUBO EXTERIOR (2) Y ENTRE ELLOS UNA CAPA INTERMEDIA (2) DE UN MATERIAL MAS BLANDO QUE EL DEL TUBO INTERIOR. LA INVENCION TAMBIEN SE REFIERE A UN METODO PARA LA PRODUCCION DE UN TUBO D...

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Bibliographische Detailangaben
1. Verfasser:	JARVENKYLA, JYRI
Format:	Patent
Sprache:	spa
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BLASTING ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING JOINTS OR FITTINGS FOR PIPES LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM LIGHTING MAKING GRANULES OR PREFORMS MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING PERFORMING OPERATIONS PIPES PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Zusammenfassung:	LA INVENCION SE REFIERE A UN TUBO DE PLASTICO DE MULTIPLES CAPAS COEXTRUIDAS QUE COMPRENDE UN TUBO INTERIOR (1) Y UN TUBO EXTERIOR (2) Y ENTRE ELLOS UNA CAPA INTERMEDIA (2) DE UN MATERIAL MAS BLANDO QUE EL DEL TUBO INTERIOR. LA INVENCION TAMBIEN SE REFIERE A UN METODO PARA LA PRODUCCION DE UN TUBO DE MULTIPLES CAPAS COEXTRUIDAS EN UN EXTRUSOR DE MULTIPLES CAPAS Y A UN APARATO PARA LA PRODUCCION DE UN TUBO DE MULTIPLES CAPAS COEXTRUIDAS. A method and an apparatus for producing a multilayer plastic pipe. The method comprises producing said multilayer pipe in an extruder (4) with at least one screw for the inner pipe(s) (1), and one screw (5) for the middle layer (3) for conveying and plasticising plastic material prior to forming it as a pipe. Pressurised gas is injected to the plastic material in the plasticisation zone (A) of the screw (5) for the middle layer (3) at a point where the plastic material is already substantially melted, and the gas is mixed with the plastic material and extruded into the cavity formed by the inner pipe(s) (1) and the outer pipe (2).