| 摘要 |
<p>A punching die (11) for punching out a seal member (34) from a sheet of an inorganic fiber mat (31) having a contour (31a). The punching die includes a base plate (12). A first blade (14) is supported on the base plate and has a cutting edge (13a) extending to form a loop. The first blade punches out a frame-shaped unnecessary portion (33), which includes the contour, and a seal member formation portion, which includes the seal member, from the inorganic fiber mat. A second blade (15), which is supported on the base plate at an outer side of the first blade, partially cuts the frame-shaped unnecessary portion. The at least one second blade forms a perforation in the frame-shaped unnecessary portion to separate the unnecessary portion into a plurality of unnecessary fragments (33a). This improves productivity for production of the seal members.</p> |
