| 摘要 |
Foam earplugs (90) are produced by extruding foamable material through a nozzle (12) having a throat (30) where the nozzle diameter is smallest, to produce an extrusion (34) that expands in diameter along an expansion zone (D) as the extrusion moves forward. Applicant moves dies (70, 72) against opposite sides of the extrusion and then moves the dies forward with the moving extrusion while the foam solidifies into earplugs. The earplugs to be formed have sealing portions that seal to a person's ear canal, of a maximum diameter G of about 0.4 inch, and the nozzle throat has a diameter B no more than 0.1 inch to provide a long expansion zone so the dies can begin to mold the extrusion while the extrusion is still expanding in diameter.
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