| 摘要 |
Axial thrust force on the feed screw of a plastic materials extruder increases in proportion to the increase of pressures developing within the discharge chamber of the extruder, to produce a proportionate increase in the sealing force developed between a stationary seal plate, and a rotary seal plate secured to the feed screw shaft. The seal takes up automatically for wear. An interchange of seal plates is provided to control the rate of escape of materials through the seal. Prepositioning of the feed screw shaft in the axial direction is also provided, to adjustably predetermine the seal space dimension between the plates.
|
