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4. Different types of heads and dies
4.1 Extrusion head function
The plastic material exits the extruder in the form of a rod. An extrusion head is needed to shape this material into a tube, which is then placed on a conductor (to insulate a wire) or on an assembly of wires (to sheath it).
What's more, the extruder outlet flow is parallel to the extruder axis, whereas the formed insulation tube must be perpendicular to it, to allow the conductor (or wire or wire assembly) to pass through. Indeed, a head whose formed tube would have an axis parallel to the screw would prevent the conductor from passing through. This function is performed by the connection between the extrusion head and the trumpet.
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Different types of heads and dies
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References
Manufacturer – Suppliers – Distributors
(Non-exhaustive list)
Website of wire-drawing machine and wire-drawing wire manufacturers mentioned
Niehoff : http://niehoff.de/
Samp : http://www.sampsistemi.com/
Elektrisola...
Websites
The history of cables and their production.
Porthcuno Telegraph Museum: http://www.porthcurno.org.uk/html/submarine.html
History of the Atlantic submarine telegraph cable http:// www.atlantic-cable.com/
...
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