Heating effects on Nichrome
Heating effects on Nichrome
(OP)
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
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





RE: Heating effects on Nichrome
RE: Heating effects on Nichrome
Hope this helps further.
RE: Heating effects on Nichrome
RE: Heating effects on Nichrome
the way i understand it is that you use this blade to seal/cut a polythene bag......questions..
do you have a temperature control for this blade?
is the thermocouple mounted beside the blade or on another casing?
i suggest to use a temp. control with alarm setting ...say set at 350 deg.F with +/- 10 deg...if temperature exceeds 360 deg. F then an alarm signal will activate cutting of the relay that is supplying power to the blade..
i hope i got you right
dydt
RE: Heating effects on Nichrome
RE: Heating effects on Nichrome
Blade size 2.55" x 1.18" x .019" i.e. about 1.2" wide and 2.6 " long ???
If you connect 108 microOhm to 110V, it will take 112 Megawatts !!!
<nbucska@pcperipherals.com>
RE: Heating effects on Nichrome
108 uohm * L/A = 0.0048ohm, better, but not by much, only 23,000 amps required
It looks like your cross-sectional area is waaaaaay too large. You may need to use a smaller cross-section and mount it on a passive heat spreader.
TTFN
RE: Heating effects on Nichrome
<nbucska@pcperipherals.com>
RE: Heating effects on Nichrome