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Shrink fitting Teflon insulation onto a wire inside of a stainless steel susceptor

///Shrink fitting Teflon insulation onto a wire inside of a stainless steel susceptor
Shrink fitting Teflon insulation onto a wire inside of a stainless steel susceptor 2017-07-06T06:21:06+00:00

Shrink fitting of PTFE tube with a substrate insideShrink fitting of PTFE tube with a substrate inside

Objective
Shrink fit Teflon insulation onto a wire by heating a stainless steel pipe as a susceptor using induction. The target shrink-fitting temperature is 350°C (660°F) and overheating of the inner wire must be prevented to achieve a uniform shrink-fitting of the insulation.

Equipment
SM2/200 Power Supply with Thermocouple
HS-8 Heat Station
Ultraflex 3-turn induction coil

Materials
Stainless steel pipe
Fixture for the stainless steel pipe
Wire, 0.014 cm (0.035 in) diameter
Teflon insulation

Key Parameters
Temperature: 350°C (660° F)
Power: 0.4 kW
Time: 35 secs.
Frequency: 143 kHz

Preparing:

  • The stainless steel pipe will be used as a susceptor to heat the Teflon insulation around the wire.
  • A simple fixture to hold the stainless steel pipe was made to prevent the wire and insulation from touching the hot surface of the pipe.
  • The thermocouple was attached to one end of the tube and to the induction generator to use the generator’s thermo-regulation.

Process

  • Initial heating with thermo-regulator parameters:
    Power set: 20%
    Temperature set: 350°C (660°F)
    Temperature zone: 200°C (390°F)
    Temperature offset: 24°C (75°F)
  • Feed and move the wire through the heated susceptor (the stainless steel pipe).

Results

  • Main objective of the test was achieved.
  • The Teflon insulation is shrink-fitted with high quality, and the wire is not damaged by the process.

Conclusions:

  • 2 kW air cooled unit is suitable for the process.
  • The Teflon insulation can be heated from the “outside” using controlled process.

Pictures

Video

Request information or contact us about this application. Reference info: Application Note 3464-4593.

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