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Shrink fitting of PTFE tube with a substrate inside

Home/Induction Heating Applications/Induction Shrink Fitting/Shrink fitting of PTFE tube with a substrate inside
Shrink fitting of PTFE tube with a substrate inside 2017-05-16T12:07:29+00:00

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

Objective
Shrink fitting of PTFE tube with a substrate inside using induction susceptor heating. Shrinking temperature is 350°C. Overheating of inner wire must be prevented.

Equipment
SM2/200 Power Supply with thermocouple
HS-8 Heat Station
Ultraflex 3-turns coil

Materials
Stainless steel pipe
Fixture for the stainless steel pipe
Guidewire with diameter app 0.035 inch (0.014 cm)

Key Parameters
Temperature: approximately 662° F (350°C)
Power: 0.4 kW
Time: 35 seconds
Frequency: 143 kHz

Preparing:

  • Stainless steel pipe will be used for susceptor. It will be heated by induction using temperature control of the process.
  • Simple fixture for stainless tube holding was made. Thermo-couple was attached to one end of the tube. Purpose of the fixture is to prevent wire and shrink material to touch the hot surface of the pipe.
  • Thermo-couple was attached to induction generator in order to use internal thermo-regulator.

Process

  • Initial heating with thermo-regulator parameters:

– Power set: 20%
– Temperature set 350°C
– Temperature zone 200°C
– Temperature offset 24°C
Preheating time is around 2 min.

  • Feed and moving the wire through the hot pipe by hand

Results

  • Main objective of the test was achieved. PTFE can be heated from “outside” using controlled process.
  • Heated sections of the wire seem with good quality.
  • Wire doesn’t seem to be damaged.

Conclusions:

  • 2kW air cooled unit is suitable for the process.
  • Custom air cooled (litz wire) coil have to be designed.
  • Speed and temperature have to precised to achieve perfect results.

Recommendations:

  • Induction system:

SM-2/200 with TC
HS-4AN
– Custom designed coil

  • As a vital part of the process, feeding of the wire needs more attention.

Pictures

Video

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