US 12,172,816 B2
Packaging body
Masayuki Sakurai, Koga (JP); Tsutomu Kubota, Hamamatsu (JP); Hiroyuki Wakaki, Koga (JP); and Tatsuya Toyama, Tokyo (JP)
Assigned to MITSUI CHEMICALS TOHCELLO, INC., Tokyo (JP)
Appl. No. 17/761,477
Filed by MITSUI CHEMICALS TOHCELLO, INC., Tokyo (JP)
PCT Filed Sep. 16, 2020, PCT No. PCT/JP2020/035037
§ 371(c)(1), (2) Date Mar. 17, 2022,
PCT Pub. No. WO2021/054349, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 2019-171374 (JP), filed on Sep. 20, 2019.
Prior Publication US 2022/0348391 A1, Nov. 3, 2022
Int. Cl. B65D 75/00 (2006.01); B32B 7/027 (2019.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01); B32B 38/00 (2006.01)
CPC B65D 75/008 (2013.01) [B32B 7/027 (2019.01); B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 27/32 (2013.01); B32B 2038/0028 (2013.01); B32B 2250/02 (2013.01); B32B 2250/242 (2013.01); B32B 2307/31 (2013.01); B32B 2553/00 (2013.01); B65D 2575/30 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A packaging body configured with a packaging film,
wherein an outermost layer is a polyethylene-based resin layer,
the polyethylene-based resin layer is biaxially stretched,
wherein a thickness of the outermost layer is 0.05 μm or more and 6 μm or less, and
wherein an average density of a polyethylene-based resin constituting the polyethylene-based resin layer is 935 kg/m3 or less,
wherein the polyethylene-based resin constituting the polyethylene-based resin layer comprises two or more polyethylene-based resins,
wherein the polyethylene-based resin is at least one selected from the group consisting of high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low density polyethylene, and ultra-high-molecular-weight polyethylene, and
wherein the two or more polyethylene-based resins satisfy at least one of following (i) or (iii);
(i) two of the polyethylene-based resins having different MFR's of 0.5 g/10 minutes or more, a mass ratio of a polyethylene-based resin with a smaller MFR of the two resins/a polyethylene-based resin with a larger MFR of the two resins being same or more than 1,
(iii) two of the polyethylene-based resins having different melting points of 1° C. or more, a mass ratio of a polyethylene-based resin with a lower melting point of the two resins/a polyethylene-based resin with a higher melting point of the two resins being same or more than 1.