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US 5,634,249 AGranted
Process for the production of multifilament yarn drawn in the interlacing stage, from partially oriented thermoplastic yarns
OwnerVito Ballaratiinventor
Life of this patent
Estimating the term…
Abstract
A process and apparatus for simultaneously drawing and interlacing partially oriented thermoplastic yarns. The process is carried out in a single apparatus by maintaining the yarn under drawing tension and simultaneously contacting the tensioned yarn with a gaseous fluid at an angle, temperature and pressure such that the yarn is simultaneously drawn and interlaced at the point it is being drawn.
Claims11
A process for preparing drawn thermoplastic yarns comprising
- subjecting a partially oriented multifilament yarn to a tension sufficient to completely orient the yarn, and
- simultaneously contacting the taut yarn with a gaseous fluid jet at an angle, temperature and pressure such that the yarn is simultaneously drawn and interlaced at the point in is being drawn.
A process for producing drawn thermoplastic yarns comprising
- subjecting a partially oriented multifilament yarn to a tension sufficient to form a drawing neck, and
- simultaneously contacting the yarn at the drawing neck with a gaseous fluid jet at an angle, temperature and pressure such that the yarn is simultaneously drawn and interlaced.
An apparatus for simultaneously drawing and interlacing thermoplastic yarns at the same point, comprising
- at least one tubular chamber for drawing a partially oriented yarn, and
- a nozzle for injecting a jet of gaseous fluid into the tubular chamber positioned so that the jet of gaseous fluid is perpendicular to the direction of the yarn, said jet of gaseous fluid being at a temperature and pressure suitable for drawing and interlacing the yarn at the same point.
Dependencies are inferred from the claim text.