| 摘要 |
A slug of powdery depolarizer material is inserted into a paper-line zinc can 35, by extruding the material along a passage 4 by a ram 1, which over the first part of its stroke consolidates the material against the effect of a restriction 5 in the passage 4 and then injects the consolidated material through a nozzle 3 into the can 35 so as to fill the can in a single stroke of operation, the bottom of the can starting close to the nozzle and then progressively moving away from it at a rate which is directly proportional to that of the ram 1, under positive control by a cam 37. The working end of the ram 1 is formed with a recess communicating with the outer surface of the ram by way of one or more bleed holes 51, which is or are closed just before extrusion starts, whereby a substantially constant volume of material is injected for each stroke of the ram. <IMAGE> |
