| 摘要 |
<p>PURPOSE:To restrain a pressure rise when a temperature inside a container is raised rapidly by a method wherein a ventilation-resistance adjusting mechanism is installed at a ventilation port. CONSTITUTION:A ventilation port 3a is provided with a ventilation-resistance adjusting mechanism 12. When a temperature is raised, a ventilation resistance at the ventilation port 3a is reduced. Consequently, when a temperature inside a container is raised, the ventilation-resistance adjusting mechanism 14 is actuated, the ventilation resistance at the ventilation port 3a is reduced, a much more air current amount flows out to the outside from the ventilation port and a pressure rise due to a temperature rise is released. Thereby, it is possible to restrain the pressure rise due to the rapid temperature rise inside the container.</p> |
