BIODEGRADABLE ALIPHATIC POLYESTER DRAWN YARN AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To stably provide a biodegradable aliphatic polyester drawn yarn having high strength and high toughness.SOLUTION: (A) A biodegradable aliphatic polyester drawn yarn has a molecular weight retention of 75% or more with respect to a biodegradable aliphatic polyester resin raw material; (B) the biodegradable aliphatic polyester drawn yarn is formed by drawing a biodegradable aliphatic polyester undrawn yarn whose extension rate λsatisfies the condition represented by the following formula (i): 1.0≤λ≤2.0 (i); (C) the draw ratio relative to the undrawn yarn λsatisfies the condition represented by the following formula (ii): 3.3≤λ(ii); (D) the network draw ratio λsatisfies the condition represented by the following formula (iii): 3.5≤λ≤20.0 (iii); and (E) the tensile strength (unit: cN/dtex) and the tensile elongation (unit: %) satisfy the condition represented by the following formula (iv): (tensile strength)×(tensile elongation)≥30 (iv).