| 摘要 |
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 DEG C to about 160 DEG 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 DEG C to about 180 DEG C, to form a polypropylene suture. |
