Process and apparatus for the production of a low-shrinkage aliphatic polyamide yarn, and low-shrinkage yarn

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United States of America Patent

PATENT NO 10689778
APP PUB NO 20170327972A1
SERIAL NO

15537866

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Abstract

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A process and an apparatus for production of a low-shrinkage aliphatic polyamide fibre, in which polyamide is extruded through a spinneret to form filaments, then cooled and combined to form at least one yarn. The at least one yarn is subjected to drawing between the spinneret and a pair of inlet rolls, then in a further multi-stage drawing step is subjected to 4-fold to 6-fold drawing by pairs of draw rolls. The pairs of draw rolls successively heat the yarn and at least the last pair of draw rolls has a temperature of 5° C. to 20° C. below the melting point of the yarn. The yarn is relaxed by from 6% to 10% in a subsequent at least three-stage relaxation zone and is kept in a temperature range of 5° C. to 15° C. below the melting point of the yarn, and is subsequently wound up on a reel device. The invention further relates to a yarn composed of a low-shrinkage aliphatic polyamide fibre.

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Patent Owner(s)

Patent OwnerAddress
TRÜTZSCHLER GROUP SEDUVENSTR 82-92 41199 MÖNCHENGLADBACH 41199

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Keulers, Martinus Joseph Maria AA Echt, NL 7 0
Nasri, Lassad Winterthur, CH 5 0
Stepanyan, Roman AA Echt, NL 12 0

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