What is the copy paper for?
Bureaucracy arose thousands of years ago. Once during the archaeological excavations in Egypt, a huge number of clay tablets with the same text were found. The rewriting then engaged in literate slaves.
For the first time, the technology by whichmade a copy paper, was patented on October 7, 1806 in the UK. The paper was two-sided, saturated with printing ink. The invention of the famous "copy" belongs to Ralph Wedgwood.
In the 1820s, copying paper based onsoot began to be produced on an industrial scale. The peak of its popularity fell on the 70th, when the printing machines began to appear massively. The coating began to add mastic, which allowed to avoid the drawback of the previous option - the pollution of everything to which it touched. Before the advent of modern copying equipment (copier, fax), a carbon copy was very much in demand. Today it is not so popular and is used primarily in sewing.
The copying paper has a small density. On one side of it is applied a color layer, which helps to receive several copies at the time of writing, printing or drawing. A sheet is laid between ordinary paper with a color layer down. When writing on a sheet located at the top, by pressing the handles, the coloring particles pass to the sheet that is placed underneath the carbon paper.
With this paper, you can receive copies ofvarious documents. Today, special materials for blueprinting are distributed, and there is also a variety of them intended for high contrast color copies.
Also now there is photo-technical reflexpaper for copies from barcoded originals (one- and two-sided) by way of contact copying. There were also photoshoot photosensitive materials (negative, positive) for obtaining copies from dashed and halftone originals by means of photocopying. Another type is a photocamera, which is used to produce copies from bar-like originals using contact and projection printing. Also, a thermoset copying paper is used for reflex replicating in thermal (infrared) beams and thermal transfer of images onto ordinary paper. The photopolymer photographic materials have a thin light-sensitive semiconductor layer on the surface based on zinc oxide.
Office copy paper, whichcan be in many stores, high contrast images. The time to make a copy can be from a few seconds to a minute or more. According to the technology of their processing (fixation, manifestation, etc.) and the duration of storage of copies, there are also different kinds of paper.
Often, to obtain copies, the usualpaper not processed, as in the case of contact or matrix-portable copying, as well as when reproducing the original through the possibilities of operational printing.