| abstract |
Provided is a heat-shrinkable polyester film satisfying: (A) a heat shrinkage percentage of 10% to 50% in a maximum shrinkage direction in a hot water at 70° C., (B) a heat shrinkage percentage of not less than 75% in a maximum shrinkage direction, and not more than 10% in an orthogonal to the maximum shrinkage direction in a hot water at 85° C., n (C) a heat shrinkage percentage difference ΔX(%)=X 0 −X 10 of a sample is 10% to 20%, wherein, X 0 and X 10 are defined as follows, X 0 (%): a heat shrinkage percentage in a maximum shrinkage direction in a hot water at 95° C.; and X 10 (%): a heat shrinkage percentage in a maximum shrinkage direction of a film having experienced heat shrink by 10% in a maximum shrinkage direction; (D) a three-dimensional surface roughness Δa gives 0.008 to 0.04; and (E) a three-dimensional surface roughness SRz gives 0.6 to 1.5 micrometers. Even in use for full label usage, the heat-shrinkable polyester film has excellent quality after shrink-finishing, reinforcement function of containers after wrapped by shrinking, and blocking resistance, and furthermore exhibits excellent film-formation property, and processability as well. In addition, the present invention provides a heat-shrinkable polyester film having ultraviolet absorptivity, and a heat-shrinkable polyester film roll exhibiting uniform heat shrinkage properties over whole of a long film. |