| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling pack unit that has high cooling effects, and makes it possible to extend a time duration length of the cooling effects, simplify manufacturing processes, and make manufacturing costs low.SOLUTION: There is provided a cooling pack sheet 1 that is configured by including: a top surface layer 3 and a back layer 4 each made of a gas-permeable and moisture-impermeable synthetic resin sheet; and a cold storage layer housed in a flat bag body 2 and cooled with cooling components of a high-pressure cooling gas. A cooling gas injection port 21 is formed of an opening formed in or near an edge of the flat bag body 2, a gas introduction path 23 is formed of the top layer 3 and back layer 4 by thermal fusion 24 while extended from both ends of the opening as the cooling gas injection port 21 into the flat bag body 2 while connecting with the cooling gas injection port 21, and a gas exhaust port 22 is formed of an opening formed at or near one or both adjacent portions of the opening of the cooling gas injection port 21, and the whole periphery of the flat bag body 2 except the cooling gas injection port 21 and gas exhaust port 22 is closed. |
