Detail view of the BJ-4 Drawtwister used during the early stages of nylon production and research at the DuPont pilot plant in Wilmington, Delaware. As part of the cold-drawing process, drawtwisters were used to stretch the nylon filaments following extrusion. As visible in the photograph, the machine primarily consisted of draw rolls that ensured the filaments were stretched uniformly before being wound onto bobbins.
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“Detail View of BJ-4 Drawtwister at Nylon Pilot Plant,” July 15, 1938. Joseph X. Labovsky Collection of Nylon Photographs and Ephemera, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/dn39x159t.
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