| 摘要 |
PROBLEM TO BE SOLVED: To enable a person to feel less heat on the fingertips when the person holds a heat insulating double container made by rolling and sticking a paper sleeve 3 on the outer periphery of the drum of a synthetic resin inner container 1, after hot water has been poured in the heat insulating container or the heat insulating container has been heated in a microwave oven. SOLUTION: On the outer periphery of the drum of the inner container 1, a number of recessed grooves 4 are formed longitudinally at equal pitches. On the outer periphery of the sleeve 3, a number of projected rules 7 are formed longitudinally at equal pitches, where each pitch is different from that of the recessed grooves 4. |
