A blog about antique and vintage writing instruments: fountain pens, mechanical (propelling) pencils, dip pens, and more.
Tuesday, May 5, 2015
Another illustration of hard rubber cap manufacture
The cap on this Wirt slip-cap eyedropper nicely illustrates how such caps were made, as discussed here and here. Before vulcanization, the soft rubber mix was wrapped in sheet form around a mandrel. The edge of the sheet is clearly visible in the top image as a longitudinal break in the patterning. The view below shows how the end of the mandrel was covered with a disk of soft black rubber mix.
Labels:
manufacture,
materials
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