Abstract: Provided is a heat-shrinkable polyester film which undergoes less change in the physical properties even in a high-humidity environment, has excellent storage stability, and effectively suppresses a breakage phenomenon of the film after heat shrinkage. Disclosed is a heat-shrinkable polyester film derived from a polyester resin, in which when tensile strengths in a main shrinkage direction obtained before and after immersion in water at 23° C. for 168 hours in a tensile test as measured according to JIS K 7127 are designated as C1 (MPa) and C2 (MPa), the following Relational Expression (1) is satisfied: ?5.3<(C2?C1)<4.

Abstract: A heat-shrinkable polyester film that effectively suppresses a breakage phenomenon is provided. Disclosed is a heat-shrinkable polyester film derived from a polyester resin, the heat-shrinkable polyester film satisfying the following configurations (a) to (c): (a) a thermal shrinkage ratio in the TD direction obtainable under the conditions of 10 seconds in hot water at 80° C. as designated A1 is a value of 25% or greater; (b) when a thermal shrinkage ratio in the TD direction obtainable under the conditions of 10 seconds in hot water at 90° C. as designated A2 is a value of 40% or greater; and (c) when the upper yield point stress is E1 and the lower yield point stress is E2, a numerical value represented by E1?E2 is a value of 5 MPa or less.

Abstract: A heat-shrinkable polyester film having excellent wrinkle resistance characteristics is provided. A heat-shrinkable polyester film satisfying the following configurations (a) to (c): (a) a thermal shrinkage ratio in the TD direction obtainable under the conditions of 10 seconds in hot water at 90° C. as designated as A2, is a value of 53% or greater; (b) a maximum shrinkage stress in the TD direction at 90° C. as designated as B is a value of 2 to 10 MPa; and (c) a value represented by B/A2 is a value of 0.08 to 0.15 MPa/%.

Abstract: Provided is a polyester-based shrink film having excellent predetermined impact resistance and having a uniform shrinkage ratio near the shrinking temperature. Disclosed is a polyester-based shrink film that satisfies the following configurations (a) to (c): (a) the impact resistance strength before shrinking as measured by a film impact tester is designated as A1, and this is within 20 to 60 J/mm; (b) when the impact resistance strength measured by a film impact tester after having been shrunk by 10% in hot water at 80° C. is designated as A2, the numerical value represented by A2/A1×100 is within 60% to 110%; and (c) when the shrinkage ratio under the conditions of 80° C. and 10 seconds is designated as B1, and the shrinkage ratio under the conditions of 90° C. and 10 seconds is designated as B2, the numerical value represented by B1/B2×100 is within 70% to 90%.

Abstract: What is provided is a heat-shrinkable film and a heat-shrinkable label that, when applied to a container in which the difference between the diameter of the body portion and the diameter of the mouth portion is large, sufficiently shrink in the mouth portion and do not easily allow the generation of a wrinkle or a sink mark in the mouth portion. The heat-shrinkable film contains polyester, a dicarboxylic acid component that constitutes the polyester contains 95 mol % or more of terephthalic acid, and a diol component that constitutes the polyester contains 50 mol % or more of ethylene glycol and 15 mol % or more of cyclohexanedimethanol. The shrinkage rate in the primary shrinkage direction when the heat-shrinkable film is immersed in hot water at 70° C. for 30 seconds is 20% or less, the shrinkage rate in the primary shrinkage direction when the heat-shrinkable film is immersed in hot water at 80° C.