Film roll of heat-shrinkable polyester

A film roll of heat-shrinkable polyester film obtained by winding around a paper pipe with heat-shrinkable polyester film having a longitudinal direction as a main shrinkage direction,

• wherein the polyester film has a shrinkage of 40% or more in the main shrinkage direction after a treatment in hot water of 90° C. for 10 seconds,
• wherein the polyester film is obtained from a polyester comprising
• (a) 50 mol % or more of ethylene terephthalate based on 100 mol % total constituent components of the polyester,
• (b) 0-3 mol % of one or more aliphatic dicarboxylic acids based on 100 mol % total polycarboxylic acid content, and
• (c) 14 mol % or more of one or more monomers which can form an amorphous component based on 100 mol % total polyhydric alcohol content or 100 mol % total polycarboxylic acid content,
• wherein the monomers which can form an amorphous component are selected from the group consisting of neopentyl glycol, 1,4-cyclohexanedimethanol, isophthalic acid, 1,4-cyclohexanedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,2-diethyl-1,3-propanediol, 2-n-butyl-2-ethyl-1,3-propanediol, 2,2-isopropyl-1,3-propanediol, 2,2-di-n-butyl-1,3-propanediol, and hexanediol,
• wherein the polyester has a glass transition temperature (Tg) of 60° C. to 80° C., and
• wherein the film roll satisfies the following requirements (1) to (7):
• (1) a winding length of the film is 1000-30000 m;
• (2) a width of the film is 50-1500 mm;
• (3) a thickness of the film is 5-30 μm;
• (4) a thickness unevenness of the film is 20% or less over a whole width direction of the film on a surface of the film roll;
• (5) an internal diameter of the paper pipe is 3 inch, a gap difference of the paper pipe in a width direction of the paper roll is 0.5 mm or less after a removal of the film from the film roll, and a flattening pressure strength of the paper pipe is 1700 N/100 mm or more after the removal of the film;
• (6) an average winding hardness of the film in a width direction of the film is 500-850 on the surface of the film roll;
• and
• (7) a natural shrinkage of the film in a longitudinal direction of the film is 2.0% or less after aging the film in an atmosphere of 40° C. and 85% relative humidity for 28 days.