| 摘要 |
A dummy block (2)comprises a dummy block body (20) having a front face (281) provided with a circular groove (40) and outside of the groove (40) a peripheral annular sealing lip (28) that is sufficiently elastically deformable to be pressed outward by the extrusion pressure to seal against an inside lining (72) of a container (71). The groove (40) has an inner wall portion(23), an outer wall portion(24), and a bottom (22), said outer wall portion (24) being conical to make the groove (40) open outward. A filler ring (10) is adapted to fit in an upper part of the groove (40) while forming a gap (41) toward the groove bottom (22). The ring (10) has a conical outer wall portion (14) complementary to the conical outer wall portion (24) of the groove (40), which when being pressed toward the bottom (22) of the groove (40), forces the sealing lip (28) outward to seal against the inside wall (72) of the container (71). Also the inner wall portion (23) of the groove (40) is conical to make a cross-section of the groove (40) substantially symmetrical, and the filler ring (10) has a conical inner wall portion (13) complementary to the conical inner wall portion (23) of the groove (40). |
