Patent ID: 11919216
Assignee: TOYOBO CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C | IPC B  C

Claim 5:
6. The roll of the white heat-shrinkable polyester-based film according to claim 1, wherein
the roll of the white heat-shrinkable polyester-based film has an amorphous unit derived from at least one selected from the group consisting of isophthalic acid, neopentyl glycol and cyclohexane dimethanol;
the difference between the maximum and minimum content of the amorphous unit among samples is 2 mol % by mass or less, wherein the samples are taken from each part of the film divided into five in the film width direction; and
the difference between the maximum and minimum content of the amorphous unit among samples is 2.0 mol % by mass or less, wherein the samples are taken from the film every 100 m in the film longitudinal direction from the place forming surface layer of the roll of the white heat-shrinkable polyester-based film to the starting place of winding the film.