26.03.2014
As with the A-series and B-series of sizes, each C-size is twice the size of the one below it, and half the size of the one above it.
The following diagrams illustrate some common envelope sizes in comparison with the size of a sheet of A4 paper. This is a DL (110x220mm) size envelope.it can hold a A4 piece of paper folded into thirds or an A5 piece of paper folded once, this style of envelope is most commonly used in buisness.
A certain set of envelope sizes in common use are called the C-series and designated C4, C3, etc.
A size chart illustrating the ISO A series and a comparison with American letter and legal formats. Many paper size standards conventions have existed at different times and in different countries. See Switching costs, Network effects and Standardization for possible reasons for differing regional adoption rates of the ISO standard sizes. The international paper size standard, ISO 216, is based on the German DIN 476 standard for paper sizes.
Successive paper sizes in the series A1, A2, A3, and so forth, are defined by halving the preceding paper size across the larger dimension.
According to some theorists, ISO 216 sizes are generally too tall and narrow for book production (see: Canons of page construction). The German standard DIN 476 was published in 1922 and is the original specification of the A and B sizes.
However, DIN 216:2007 notes 2A0 and 4A0 in the table of Main series of trimmed sizes (ISO-A series) as well. The most common paper sizes used for commercial and industrial printing in Colombia are close to the ISO B1, B2 and B3 and are referred to as pliego, 1?2 pliego and 1?4 pliego respectively. In commercial and academic typesetting, the most common paper size is carta, equivalent to US Letter (8.5" by 11"). The United States, Canada and Mexico use a different system of paper sizes compared to the rest of the world. By extension of the American standards the half letter size meets the needs of many applications.


Other, larger sizes continuing the alphabetic series illustrated above exist, but it should be noted that they are not part of the series per se, because they do not exhibit the same aspect ratios.
In addition to the ANSI system as listed above, there is a corresponding series of paper sizes used for architectural purposes. In countries where the ISO sizes are standard, most notebooks and tablets are sized to ISO specifications (for example, most newsagents in Australia stock A4 and A3 tablets).
Traditionally, a number of different sizes were defined for large sheets of paper, and paper sizes were defined by the sheet name and the number of times it had been folded.
The PA formats did not end up in ISO 216, because the committee decided that the set of standardized paper formats should be kept to the minimum necessary.
PA4, sometimes dubbed L4, is also a useful compromise between A4 and North American Letter sizes.
Although the movement is towards the international standard metric paper sizes, on the way there from the traditional ones there has been at least one new size just a little larger than that used internationally.
It can hold a piece of A4 paper folded into quarters, an A5 piece of paper folded in half once or a piece of unfolded A6.
These are defined from ISO 216 and are the geometrical mean of the A and B size envelopes, therefore C4 is bigger than A4, but smaller than B4. Porstmann's system was introduced as a DIN standard (DIN 476) in Germany in 1922, replacing a vast variety of other paper formats. The current standard sizes are unique to that continent, although due to the size of the North American market and proliferation of both software and printing hardware from the region, other parts of the world have become increasingly familiar with these sizes (though not necessarily the paper itself).
It was prescribed by Herbert Hoover when he was Secretary of Commerce to be used for US government forms, apparently to enable discounts from the purchase of paper for schools, but more likely due to the standard use of trimming books (after binding) and paper from the standard letter size paper to produce consistency and allow "bleed" printing. The specific problem is: some entries repeat sizes defined elsewhere, some specify mere aliases Please help improve this table if you can. There are many sizes of tablets of paper, that is, sheets of paper bound at one edge, usually by a strip of plastic or hardened PVA adhesive. The remaining formats fit in between all these formats, such that the sequence of formats A4, E4, C4, G4, B4, F4, D4, H4, A3 is a geometric progression, in which the dimensions grow by a factor 16v2 from one size to the next. In later years, as photocopy machines proliferated, citizens wanted to make photocopies of the forms, but the machines did not generally have this size paper in their bins.


This series is somewhat similar to the ISO standard in that cutting a sheet in half would produce two sheets of the next smaller size.
The system allows scaling without compromising the aspect ratio from one size to another—as provided by office photocopiers, e.g. As a result, B0 is 1 metre wide, and other sizes in the B series are a half, a quarter or further fractions of a metre wide.
The practical usage of this is that a letter written on A4 paper fits inside a C4 envelope, and C4 paper fits inside a B4 envelope.
However, the SIS 014711 standard does not define any size between a D format and the next larger A format (called H in the previous example). Organizers, notepads, and diaries also often use this size paper thus 3 ring binders are also available in this size.
Both A- and B-series paper is widely available in Japan, Taiwan and China, and most photocopiers are loaded with at least A4 and either one of A3, B4 and B5 paper.
The American Forest and Paper Association argues that the dimension originates from the days of manual paper making, and that the 11-inch length of the page is about a quarter of "the average maximum stretch of an experienced vatman's arms."[10] However, this does not explain the width or aspect ratio. Booklets of this size are created using word processing tools with landscape printing in two columns on letter paper which are then cut or folded into the final size. Lastly, a pad of sheets each weakly stuck with adhesive to the sheet below, trademarked as "Post-It" or "Stick-Em" and available in various sizes, serve as a sort of tablet. Some visual arts fields also continue to use these paper formats for large-scale printouts, such as for displaying digitally painted character renderings at life-size as references for makeup artists and costume designers, or to provide an immersive landscape reference. The B-series is widely used in the printing industry to describe both paper sizes and printing press sizes, including digital presses.
With the German standard DIN 476 "Trimmed sizes of paper" the sizes can be expanded by using a factor in front of the size: 2A0 is twice the size of A0 4A0 is four time the size of A0 Oversized ISO A Sheets Oversized sheets are used when it is desirable to give extra protection to the drawing sheets by providing a binding or trimming margin.
B3 paper is used to print two US letter or A4 pages side by side using imposition; four pages would be printed on B2, eight on B1, etc.




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