Re: photocopier toner- what is it?
Richard Knoppow (dickburk@ix.netcom.com)
Tue, 11 Nov 1997 22:51:16 -0800
At 04:23 PM 11/11/97 -0800, George Mackie wrote:
>
>Can anyone explain how photocopier works please. All I know is that the
>toner is negatively charged and attracts to the + charges created on the
>paper but how do they make the latent image on the paper + charged in the
>first place, and what is the chemical composition of the toner.
>If you stop the copier before the paper has gone through the hot rollers
>at the end, the image is still soft and smears easily, so heat is
>necessary to fix it in place on the paper.
>
>
Someone else has posted the ingredients of toner. The Xerox type copier
works by having a drum coated with a material that will hold a charge
without letting it leak off laterally. The drum is charged by a brush with
high-voltage on it. When exposed to light the charge is knocked off
leaving an image of the dark areas of the original in the form of the
remaining charge. This charge picks up the toner. The paper is then
brought against the drum and the toner transferred to the paper with
another charge. The paper then runs under a heater to fuse the toner to
the paper. Much of the magic of the copier is in the details of the drum
coating.
----
Richard Knoppow
Los Angeles,Ca.
dickburk@ix.netcom.com