| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively and rapidly provide a technology which reduces an amount of falling cotton.SOLUTION: This quality evaluation method of rock wool comprises the steps of: forming a second rock wool layer on a first rock wool layer; then applying force in a direction in which the first rock wool layer and the second rock wool layer pressure-contact with each other; and checking adhesion strength between the first rock wool layer and the second rock wool layer after the applied force is removed. |
