In-line annealing of sutures

Details In-line annealing of sutures In-line annealing of sutures

D - Textiles, Paper

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D

D01D 10/00 (2006.01) A61L 17/00 (2006.01) A61L 17/04 (2006.01) A61L 17/14 (2006.01) D01F 6/06 (2006.01)

Patent

CA 2169149

We have discovered a process for producing a polypropylene suture comprising the steps of (a) extruding melted polypropylene resin through an orifice and rapidly quenching the melted polypropylene resin to produce a filament; (b) drawing the filament in the range of from about 5X to about 7.5X to produce a singly drawn filament; (c) drawing the singly drawn filament in the range of form about 1X to about 2.5X in a second heated zone being maintained at a temperature in the range of from about 30°C to about 160°C, to form a doubly drawn filament; (d) shrinking the doubly drawn filament in the range of from about 0.75 percent to about 0.95 percent, in a second heated zone being maintained at a temperature in the range of from about 100°C to about 180°C, to form a polypropylene suture.

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