This is a demonstration of processing electric wires into a heat-shrinkable tube using a carbon ring heater.
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Related page:
Shrinkage of heat shrink tube with heat resistance of 200℃ 
Heating of the heat shrink tubing with the Halogen Ring Heater 
No.14 Shrink processing 
No.12 Heating of heat-shrinkable tubing 
No.9 Heat source of heat shrink tunnel 
No.11 Heating the upper part of the test tube 
Heat shrink film of battery 
No.10 Pre-heating glass processing