In-line annealing of sutures

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

1995-02-10

1996-12-24

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642105, 2642107, 2642108, 2642356, 264342RE, D01D 508, D01D 1002

Patent

active

055871224

ABSTRACT:
We have discovered a process for producing a polypropylene suture including 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 5.times. to about 7.5.times. to produce a singly drawn filament; (c) drawing the singly drawn filament in the range of form about 1.times. to about 2.5.times. in a second heated zone being maintained at a temperature in the range of from about 30.degree. C. to about 160.degree. 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.degree. C. to about 180.degree. C., to form a polypropylene suture.

REFERENCES:
patent: 5217485 (1993-06-01), Liu et al.
patent: 5269807 (1993-12-01), Liu
patent: 5294389 (1994-03-01), Hain et al.
patent: 5294395 (1994-03-01), Broyer

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