| 摘要 |
A manufacturing method of a bag body that has a bag-shaped member made of an elastic and airtight material, and a granular substance filled inside of the bag-shaped member, includes a step of preparing a core for forming the bag-shaped member, by hardening the granular substance; a step of forming the bag-shaped member by forming a covering made of the elastic and airtight material around the core; and a step of breaking up the core that is inside of the bag-shaped member. |
