Why are heated rollers used in photocopy machines?

Question by Sez1o1: Why are heated rollers used in photocopy machines?
In relation with static electricity, why are heated rollers used in photo copy machines?

Best answer:

Answer by Daniel
Essentially, a copier “paints” the photoreceptor drum or belt with static electricity, creating a patch of positively charged images of letters surrounded by negatively charged areas that will remain white.

Once the image of the document has been statically “painted” on the drum or belt, the copying system covers the plate with a negatively-charged black powder called toner. Wherever the toner particles find positively-charged areas on the photoreceptor, they will stick like the pepper flakes on a statically-charged comb. The toner will not stick to the negatively-charged areas of the belt or drum, so those areas will remain white.

After the toner particles have settled into the positively-charged areas, a sheet of paper is introduced above the photoreceptor. A Corona wire passes over this paper to give it a positive charge. The toner particles are transferred to the charged paper and now resemble the image of the original document. The toner is still in the form of a loose powder, however, so the new copy is pressed through a set of heated rollers known as a fuser. The heat of the fuser melts the toner into the paper permanently.

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