Extrusion method and apparatus for producing a cable

Details Extrusion method and apparatus for producing a cable Extrusion method and apparatus for producing a cable

2006-06-13

2006-06-13

Tentoni, Leo B. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

C264S101000, C264S102000, C264S171130, C264S171140, C264S171170, C264S171180

Reexamination Certificate

active

07060209

ABSTRACT:
An extrusion method and apparatus for producing a cable including at least one core having at least one transmissive element and at least one pair of coating layers arranged at a radially outer position with respect to the core. At least one coating layer of polymeric material and one coating layer of expanded polymeric material are deposited by co-extrusion simultaneously and residual pressure not greater than the external pressure is maintained in a substantially annular interspace defined between the coating layers. The method avoids the formation of bubbles at the interface between the at least one coating layer of polymeric material and the coating layer of expanded polymeric material, attaining an optimal adhesion between the layers.

REFERENCES:
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patent: 4252755 (1981-02-01), Normanton et al.
patent: 4468435 (1984-08-01), Shimba et al.
patent: 4744930 (1988-05-01), Twist et al.
patent: 4916198 (1990-04-01), Scheve et al.
patent: 43 34 232 (1995-04-01), None
patent: 0 507 988 (1992-10-01), None
patent: WO 98/52197 (1998-11-01), None

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