Process of and apparatus for making tapes or yarns
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United States of America Patent
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Nov 30, 1999
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N/A
app pub date -
Jan 30, 1998
filing date -
Jan 13, 1998
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Abstract
For manufacturing tape or yarns, plastic polymer material is extruded into a film (20, 21) having a pattern of parallel, longitudinal, alternating ribs (31, 32) and deep, narrow grooves (33, 34) on each of its two opposite sides, at least a plurality of the grooves (33, 34) in one side each being located diametrically opposite one of the grooves (34, 33) in the other, opposite side. Yarns and tapes obtained in the form of or from such a film typically have a substantially improved tensile strength and are more supple and smooth.
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