| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a polypropylene-based material that improves the heat resistance of a polypropylene-based material.SOLUTION: A method for manufacturing a polypropylene-based material includes: a melting step of melting a polypropylene-based material extending at least in one direction at a temperature ranging from a melting peak temperature Tm +5°C of the polypropylene-based material before extended to a melting peak temperature Tm +50°C in a differential scanning calorimetry; and a heat treatment step of subjecting the polypropylene-based material melted in the melting step to heat treatment at a temperature ranging from a melting peak temperature Tm -20°C to less than a melting peak temperature Tm -10°C. |
