| 摘要 |
PROBLEM TO BE SOLVED: To improve strength and rigidity of a lid of a cold insulating container and prevent the lid from warping due to difference in thermal expansion by a difference in temperatures between the inside and the outside of the container by welding a plurality of reinforcing and welding ribs formed on a base plate of a lower lid with a top plate of an upper lid. SOLUTION: The lid C of a cold insulating container comprises a plurality of reinforcing and welding ribs 5 formed on a base plate 1 of a lower lid C1 and a top plate 7 of an upper lid C2 which are welded. |
