B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
26/197
B29C 47/02 (2006.01) G02B 6/44 (2006.01) H01B 13/00 (2006.01)
Patent
CA 1252991
ABSTRACT OF THE DISCLOSURE Process and apparatus for forming a core for optical fiber cables, the core having a central reinforcing element surrounded and contacted by a layer of plastic having helical grooves at its surface. The helical grooves are formed by passing the reinforcing element through a plastic extruder having a groove forming die and while the plastic is being applied at the extruder, the element is alternately rotated in opposite directions in advance of its entry into the extruder. The reinforcing element may be rotated by a pair of driven belts which frictionally engage the element and which are mounted on rotatable rings driven by an alternating rotation motor drive or may be rotated by a pulley which frictionally engages the element and which is carried by a support rotatable around the longi- tudinal axis of the element by an alternating rotation motor drive.
497783
Smart & Biggar
Societa Cavi Pirelli S.p.a.
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