Process and apparatus for manufacturing a core provided with open helical grooves for receiving optical fibers
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United States of America Patent
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Jun 16, 1987
Grant Date -
N/A
app pub date -
Dec 12, 1985
filing date -
Dec 17, 1984
priority date (Note) -
Expired
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Abstract
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 alternatley 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 longitudinal axis of the element by an alternating rotation motor drive.
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