| 摘要 |
An improved sealing system is provided in apparatus comprising a distributor block (12), a die tip (11) and therebetween a sealing means (24), said die tip having a centrally located molten polymer channel (14) and a surface mounted in mating abuttment with a mounting surface of said distributor block having a centrally disposed distributor cavity (13), said cavity communicating with said molten polymer channel at a juncture formed by the mounting surfaces of said die tip and said distributor block to define a molten polymer flow passage and said passage communicating with at least one extrusion aperture (16) wherein said apparatus is provided with means (30) for precisely locating the respective mounting surfaces of said die tip and said distributor block, wherein an endless groove (22, 23) surrounding said passage is formed in each of said mounting surfaces, and wherein said sealing means comprises an endless ribbon-shaped sealing member having its narrow edge portions inserted in each of said endless grooves thereby to form an extrusion pressure-tight seal. <IMAGE> |
