| 摘要 |
PROBLEM TO BE SOLVED: To provide a scratch property evaluation method for resin molding, by which the degree of conspicuousness of a scratch in resin molding can objectively and quantitatively be evaluated at high reproducibility by a simple method, also an evaluation result highly correlated with visual evaluation can be obtained, and the degree of conspicuousness of scratch when resin molding is used for a long term under direct sunlight can be evaluated, and to provide a manufacturing method for resin molding, using this evaluation method.SOLUTION: In a scratch property evaluation method for resin molding, an absolute value (&Dgr;L) of the difference between the brightness of the surface of a resin molding before scratched, measured by SCE system, and the brightness of the surface of the resin molding after scratched, measured by the SCE system, is obtained, also an absolute value (&Dgr;L) of the difference between the brightness of the surface of resin molding before scratched, measured by SCI system, and the brightness of the surface of the resin molding after scratched, measured by the SCI system, is obtained, and &Dgr;Land &Dgr;Lare used as evaluation indexes for the degree of conspicuousness of scratch. |
