Extrusion method and apparatus for producing a cable

H - Electricity – 01 – B

Patent

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Details

H01B 13/14 (2006.01) B29C 47/02 (2006.01) B29C 47/06 (2006.01) B29C 47/28 (2006.01)

Patent

CA 2459907

An extrusion method and apparatus (11) for producing a cable (1, 101) including at least one core (7) comprising at least one transmissive element (2, 40), and at least one pair of coating layers (8, 9) arranged at a radially outer position with the respect of the core (7) are described. The method of the invention includes the simultaneous steps of depositing by co-extrusion at least one coating layer (8) of polymeric material and one coating layer (9) of expanded polymeric material and of maintaining a residual pressure not greater than the external pressure in a substantially annular interspace (21) defined between the coating layers. With respect to the methods of the prior art, the present invention allows to avoid the formation of bubbles at the interface between said at least one coating layer (8) of polymeric material and the coating layer (9) of expanded polymeric material, attaining an optimal adhesion between said layers (8, 9).

L'invention concerne un procédé et un appareil d'extrusion (11) destinés à produire un câble (1, 101) comprenant au moins une âme (7) dotée d'au moins un élément de transmission (2, 40) et d'au moins deux couches de revêtement (8, 9) disposées sur un emplacement extérieur radial relativement à l'âme (7). Le procédé de l'invention se réalise en des étapes simultanées qui consistent à: déposer par coextrusion au moins une couche de revêtement (8) en matériau polymérique et une couche de revêtement (9) en matériau polymérique expansé; et à maintenir une pression résiduelle égale ou inférieure à la pression extérieure dans un espacement entre-deux (21) sensiblement annulaire délimité par les couches de revêtement. Le procédé de l'invention, comparé à ceux de la technique antérieure, permet d'éviter la formation de bulles au niveau de l'interface entre la (les) couche(s) de revêtement (8) en matériau polymérique et la couche de revêtement (9) en matériau polymérique expansé, ce qui assure une adhérence optimale entre ces couches (8, 9).

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