On 10/11/2012 21:11, Tony Duell wrote:
What I was really asking is what is the physcal
difference between the
2 toners that cause them to behave differntly. What is the physical
meaning of 'The toner has a different polarity'? -tony
Laser printer toner tends to be mono component, that is it does not
require a separate carrier or developer to transport it to the
photoreceptor and is magnetic. Copier toner tends to require a separate
carrier that is made of a coated magnetic powder. The Carrier is
recycled and not consumed, but does wear out over time.
Laser printers work by charging a light sensitive, semiconducting drum
or belt, the charge will vary depending on the type of material used.
The drum may be charged positive or negative. A laser or LED array will
then erase certain parts of the charge on the photoreceptor, then
depending on which and how much charge the toner carries it will stick
to either the charged or discharged areas. These charges are always
different even on m/c's made by the same company so toners are rarely
the same between m/c's.
Also fusing tempratures of these toners are different. not enough heat
and you can rub the toner from the sheet, too much it sticks to the
fusing rollers..
Roger