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Additional resources for Lead 68. Edited Proceedings, Third International Conference on Lead, Venice
Sample text
The arsenic content of this alloy was too low to permit accurate microanalysis by means of the electron probe-microanalyser. 1). Also, although segregation could occur during solidification, experiments in which plasticine was extruded at room temperature suggested that the shear deformation within the material being extruded would mix up the material as it was propelled forwards thus dispersing segregates. Slowly moving material such as that trapped in the key way s was not subject to this intense shear and gross segregates accumulating at such positions in the machine could pass through to the die intermittently without being thoroughly mixed in with the other material passing through the machine.
A small container on the end of a long handle is used for the purpose. The container has a screw top and a large number of holes at the bottom. The container is filled with tallow and dipped under the molten lead. The lead will melt the tallow and displace it from the container. The tallow bubbling through the lead has a cleaning effect, bringing suspended oxide to the surface. 30 MELTING KETTLE ViC LEAD-ALLOY Reference has been made above to modification of the melting kettle. A further feature of the modification is that any foreign particles in the lead will be screened off by raising of the overflow system.
Introduction and Summary Although screw extruders have been in use for many years for sheathing power and telephone cables with lead, some lead alloys still present problems when extruded commercially. 85% antimony) are difficult to extrude consistently to yield a satisfactory quality of sheath at an economic speed. The experiments described here were done in order to get a clearer understanding of the way in which a continuous screw extrusion machine functions so that the cause of the difficulties could be found and, if possible, ameliorative measures recommended.