Carbon paper

Carbonless paper, also blue paper, carbon paper, self-copying paper or carbon paper called, is used to create documents in multiple copies.

While in Austria, there is also the name of carbonless paper, but has a different meaning. It said sheet is referred to the write-through, on which the copy is made with a paper punch.

The carbon paper is placed under to the original, while under the carbon paper another (often thin ) sheet of paper is placed. Now by using the pen when writing on the top sheet firmly enough ink is transferred from the carbon paper on the bottom sheet. This also works with typewriters, which bring the characters to print on the paper, especially with a type lever or ball head. And multiple copies ( copies) may be made by one sheet of carbon paper and a sheet of ordinary paper is placed underneath. The maximum number of copies depends on the pressure.

Most are black carbon paper for typewriters punches and blue for handwritten copies used. Corrections are expensive because they must be run on each sheet individually. Therefore, at the typewriter particularly much care must be given to correct writing.

Even for line printers, as they are sometimes still used in data centers, there are endless paper records containing carbonless paper.

Because computer with word processing software have almost completely replaced the typewriter, carbon papers are nowadays practically only for handwritten documents in use.

From the English word for a punch, Carbon Copy, comes the now common in e -mail traffic abbreviation CC.

Who invented the carbon paper, is not known. On October 7, 1806 a patent for the Englishman Ralph Wedgwood was assigned to an apparatus for duplication of documents, with an ink- impregnated paper was meant in conjunction with a metal stylus. The production began a few years later. Ralph Wedgwood should not be confused with Thomas Wedgwood, who worked a few years earlier in the manufacture of contact copies optically.

As carbon paper also Florpost used.

Carbonless paper without carbon layer

Modern carbonless copy papers used to make copies without carbon layer, for example, for invoices (one third of total consumption), forms and contracts.

Is a wood-free base paper, which is coated with different chemicals. The copy is formed by the chemical reaction between a color former and a developer. The principle is therefore based on to make a copy, by a chemical reaction between two complementary layers is caused by the generated by a writing instrument, a computer printer or typewriter print on the paper. The first transmitting layer, the so-called CB- layer ( coated back - coated back ), is composed of microcapsules containing a embedded in a binder colorant. These capsules with a diameter of tens of micrometers, for example, contain a colorless crystal violet. If mechanical pressure on these capsules is exercised, they burst and release the ink well, by the second, absorbing layer, the so-called CF - layer (Coated Front - coated front), is absorbed. This CF layer is composed of a reactive substance ( or "activated clay ") which reacts with the color encoder for example, to blue-violet triphenylmethane dye and produces an image.

There are two basic systems for the production of carbonless paper. The predominantly used system ( more than 95 % of carbonless paper for use comes ) is the microencapsulated dye and the carbonless developers to apply separately. Using this procedure, three types are generated by carbonless paper:

• CB cover sheet ( coated back - coated back ): This is a carbonless paper with a transmitting coating on the back, which contains the filled with the color encoder microcapsules. This sort of carbonless paper is used as the top copy of the records.

• CFB (Coated Front and Back - coated front and rear): This variety of carbonless paper is coated on the front with a acting as a chemical developer reactive substance and on the back with microcapsules. CFB paper is used as the middle sheet or an average of multiple sheets of the form sets. It is the central part of the sentence, which both receives a copy and passes.

• CF (Coated Front - coated front): This variety of carbonless paper is used as a final copy of the bundle and coated on the front with a reactive substance, while the back is not coated with microcapsules containing the color former.

A special case is the SC ( self contained ) designated paper dar. Here, microcapsules and color formers are on the same sheet. This enables SC paper with any paper (eg normal copy paper or company letterhead ) to be used to produce a copy.

3M offers specifically for typewriter users, the so-called ( available also colored) Paper Action, which was behind the original to be inscribed in plain paper clamped in the typewriter. In contrast to the aforementioned coated paper (upper - middle and lower leaf ) the material micro capsules (also handwritten ) were destroyed by the pressure during the writing process and discolored contact with oxygen contained. This worked well with single sheets as punch, up to three legible copies could then be made in one operation.