In a preferable embodiment, at least five identical film-like test pieces are gathered, bundled and used as one set, and one edge section in the longitudinal direction is heat-sealed in order to integrate the set, and the set is held along the patch plate of the upper clamping tool. 好ましい具体例として、同一フィルム試験片を、最低5枚を1組として収束し、長手方向の片方端部を熱融着し一体化させ、上部つかみ具の当て板に沿って挟持させる場合をあげることができる。 - 特許庁