| 摘要 |
PROBLEM TO BE SOLVED: To easily and reliably cancel a positive pressure without opening a valve by an operating member. SOLUTION: The portable heat-insulating container includes a container body 1 which is made into a heat insulating structure and has an opening 1a with a diameter approximately equal to that of a barrel and a plug 2 detachably mounted on the opening 1a. Vent holes 14, 14, etc., for allowing the inside and the outside of the container body to communicate with each other are formed on a bottom of the plug 2, and an attaching frame 17 having numerous communication holes 20, 20, etc., is mounted to cover the vent holes 14, 14, etc. In addition, a first porous film 19 which is air-permeable and water-impermeable is supported on the frame 17. Thus, even if a pressure inside the container body 1 increases as in the case where hot water is poured, the internal pressure can escape outside via the first porous film 19 which is air-permeable. |
