Heating effects on Nichrome blade 2 1

[KAP67]

Not sure how to reply to dpc, first time on site therefore re issue ? with aditional info. if you could please also guide me on how to reply/keep thread running.

Thanks

Sorry if I didn't explain fully, the heat seal blade has a thermocouple connected to it, this is fed into a temperature trip unit, I also have a timer on the system to ensure the blade is only energised for a short period of time & am looking at current limiting. The fault condition is if these forms of protection fail and the blade continues to heat, what would be the max. temp this blade would reach, would it 'pop' or is there an equilibrium point at which the blade can heat no more ? and if so what are the formulas for calculating this based upon the original info supplied.

Hope this helps further.

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I have a requirement for a Nichrome heat seal blade which is used to heat seal & cut a polythene bag. The problem I hope somebody could assist me with is the maximum heating of the blade under fault conditions, what temp will it reach ? or will it 'pop' like a fuse ?

Blade details
Material - Nichrome 80/20
Size - 65mm x 30mm x 0.5mm
Electrical resistivity @ RT - 108Microhm/cm
Temp coefficient of Resistivity - 100ppm/°C (25° to 105°C)
Thermal conductivity @ 100°C - 15.0W/múK
Supply 110vac

 

[redtrumpet]

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