Single Sheet

Continuous-Form Paper

What paper type?

How fast?

The speed of a printer is measured in several ways:

cps	= characters per second
lpm	= lines per minute
ppm	= pages per minute
The faster the printing, the more expensive the printer.

Old style: Sheets are connected together with a strip of punched holes running down each side. The pages unfold in a zig-zag. After printing, you can tear the pages apart and tear off the punched hole strips. Those holes are used to pull the paper through the printer.

This kind of paper is not used as often as it once was. It is still used with sheets of forms amd receipts that make multiple copies with carbonless paper (using old-style dot-matrix printers).

Advantage:	Don't need to put in new paper often. Can make multiple carbon copies.
Disadvantage:	May need to separate the pages and remove the strips of perforations from the edges.

Advantage:	Can change to special paper easily, like colored sheets, letterhead, card stock, or envelopes. Can print on both sides, either in a duplex printer or by running the page back through.
Disadvantage:	Must add paper more often. Cannot do carbon copies.

What print quality?

LQ	Letter Quality =	as good as best typewriter output
NLQ	Near Letter Quality =	nearly as good as best typewriter output
Draft	used internally or for a test print
The better the quality, the slower the printing.

A measure of print quality using numbers is printer resolution. Measured in dots per inch (dpi), this determines how smooth a diagonal line is when printed. A resolution of 300 dpi will produce text that shows jagged edges only under a magnifying glass. A lower resolution than this will produce text with stair-step edges, especially at large sizes. Even higher resolutions are needed to get smooth photo reproduction.

Professionals in graphics use 1200 to 2400 dpi printers. Draft quality on such a printer would be 600 dpi.

Дата добавления: 2014-12-23