Heat bed Study for Scalar XL – Test 7

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In this case, we are studying the impact of the insulation when we swap the cork and the insulator foil compared with test 6.

The setup

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In a similar manner, the corkis now placed on top of the insulator foil, against the heating element.

From top to bottom we have:

  • Aluminum plate
  • 2 heating plates
  • Cork
  • Insulator foil
  • Wood plate

Setup details:

  • Heat beds: 2
  • Bed 1: MK1a (with the thermistor) powered by PSU N°1 (360W)
  • Bed 2: MK2B powered by PSU N°2 (300W)
  • Initial Temperature: 24°C
  • Target Temperature: 110°C
  • Print Surface: 1x 3mm aluminum plate (435x320mm)
  • Isolant: 2mm insulator foil + 2mm cork sheet

Temperature profiles:

The red curve is the heating profile, when we apply the 110°C target.
The blue curve is the cooling profile, when the target temperature is set to 0°C.Here the power supplies are OFF.

At the bottom of each graph you have the time in seconds

On the left of the graphs you have the temperature in °C

 

Conclusion

While heating we have:

  • 60°C in 4 min 09 (249 sec)
  • 100°C in 30 min 54s (1854 sec)

The system can barely reach 100°C !

And we must wait 6 min 40 sec (400 sec) to  cool down from 100°C to 60°C

Comparison with the previous test:

Compared with  test 6 the performances are slightly better at 100°C but slighly worth around 60°C

  • Heating time to reach 60°C has increased by 4%
  • Heating time to reach 100°C MAX has decreased by 0.5%.

In the end , the insulation foil has better performances when placed directly against the heating element allowing it to push back to the aluminum plate the whole IR radiation.

Also the Cork seems to have some kind of heat capacity that decreases the heat bed performances.

However it allows to keep the heat longer during cooling times.