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Fibers are formed from enzyme-treated, acid-soluble collagen by coagulation of extrudates in ammonium hydroxide followed by cross-linking with glutaraldehyde. A tensile strength of 60 MPa is attained when a 5% collagen solution (pH 3.1) is extruded at an average velocity of 11.8 cm/s through a die which is 0.89 mm in diameter. Coagulation for 1 min in 0.2 N ammonium hydroxide is followed by cross-linking for 3 min in a mixture of 0.5% glutaraldehyde, 9.5% water, and 90% ethanol. Sodium chloride was inferior to the ammonium hydroxide as a coagulant as far as development of tensile strength was concerned. The effects of die diameter, coagulation, and cross-linking times and concentrations are explored.

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