公开(公告)号：US20220388746A1

公开(公告)日：2022-12-08

申请号：US17886683

申请日：2022-08-12

Applicant: TOPPAN INC.

Inventor： Wataru YAMAMOTO ,  Tetsuo SATO ,  Yoshifumi KUROSE

IPC: B65D65/42 ,  B32B1/00 ,  B32B27/36 ,  B32B27/34 ,  B32B27/32 ,  B32B27/08 ,  B32B7/12 ,  B65D65/40

Abstract: A freezing packaging film having transparency that produces a color difference (ΔE) of 30 or less on a surface of contents when subjected to frozen storage at −20° C. for 2 weeks, the contents being a reagent containing 0.14 mass % of methylene blue and having L* of 55 to 65, a* of 3 to 9 and b* of 45 to 55 in a L*a*b* color system.