Office paper specifications

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The definition of the International Organization for Standardization International standard for paper sizes used in most countries around the world today. It is the standard that defines the well-known paper sizes.
This standard was originally incorporated by the German Empire in 1999 (numbered as), although some of the formats were also developed by France during the same period, but were later forgotten.
Three groups of paper sizes, B and C, are defined. Group C paper sizes are mainly used for envelopes.
The aspect ratio of the group of paper sizes is: rc, then rounded to the nearest millimeter. It is defined as paper with an area of one square meter and an aspect ratio of: rc. The following paper sizes are defined as folding the paper with one size less number in half along the long side, and then rounding off to the nearest millimeter. The most commonly used paper size is its size times millimeters.
The paper size of group B is the geometric mean of the group of papers with the same number and one number less. For example, B is the geometric mean of and.
Similarly, the size of paper in group C is the geometric mean of the papers in group B with the same number. For example, C is the geometric mean of B and . (In addition, Japan has an incompatible Group B paper size, which is defined by the arithmetic mean rather than the geometric mean.
Group paper sizes are mainly used for envelopes. A piece of paper of the size can fit into a C A C-sized envelope. If you fold the paper in half, it will fit into a C-sized envelope, and so on.
Before being widely adopted, there were many different paper formats internationally. These formats It is not a coherent system, and many are not defined in metric units. The format follows the :rc ratio. Two sheets of paper placed next to each other have the same aspect ratio and sides. This feature simplifies a lot of things. , for example: reduce two pieces of paper
Photocopy to one piece of paper Enlarge one piece of paper to one piece of paper Photocopy and enlarge half of the paper to one piece of paper, etc.
The main obstacle to this standard is The United States and Canada still use the reliability (r), c paper size system. (Canada uses a set of paper sizes, but it is actually the paper size used in the United States, and then takes the closest metric size.) China National Standard of the People's Republic of China B/ "Format Dimensions of Printing, Writing and Drawing Paper", and are not equivalent to: "National Standard of China" "Paper Dimensions (After Cutting)" of the Republic of China, similar to:

Standard paper specifications (size)

The nationally prescribed format sizes are the adopted international standard series, which have now been incorporated into the national industry standard B/ and are implemented nationwide. The current format sizes of books and periodicals are mainly series specifications , there are the following types:




Note: The size has not been determined yet, but it is commonly used.
The copying we talk about in our daily life Paper, paper refers to these sizes, that is, the size of paper (paper) is:, notebook (notebook) specifications are: .c. Paper size introduction paper size (large open) paper size (large open) paper size (wide open) b paper size (open) b paper size (open) Open paper size paper can be divided into newsprint, letterpress printing paper, offset paper, glossy coated paper, matte paper, dictionary paper, map paper, gravure printing paper, Weekly newspapers, graphic newspapers, white board paper, written paper, special paper, etc.
Ordinary paper can be divided into,,,,,,,,,, according to the weight. Open means open, the size is, if it is inside r No, then set it yourself. Fully open, loaded into sheets, you measure it. The specifications of the paper refer to the paper after it is made, trimmed and trimmed, and cut into a certain size. In the past, it was measured in terms of how many open (such as open or open) etc.) to indicate the size of the paper. Now I adopt the international standard, which stipulates that the format specifications of the paper should be expressed with marks such as,,,B,B... etc. The standard stipulates the width (indicated by) and length ( Expressed in ), the proportional relationship is:: .
According to the basic area of the paper format, the format specifications are divided into series, B series and C series. The format size of the format specification is ?, and the format area is square meters B. The format size is ?, the format area is .m2. The format size of C is ?, the format area is .m2. The format specifications of copy paper only use series and B series. If the paper is cut in half along the length, it becomes a standard. If the paper is cut in half along the length, it becomes a standard. If the paper is cut into two equal parts, it will be cut into two equal parts. The format sizes of ~ and B~B are listed in the table below. Among them, format specifications such as,,,, and B, B, and B are commonly used specifications for copy paper.
Example: r paper is a paper of basic size folded several times, so the area of a piece of paper is one-third of the power of the area of the basic paper, that is, /. The rest can be deduced in this way.
When I was making pictures before, I never thought about how big the size should be. I always felt that it was difficult to convert pixels into our commonly used basic units such as millimeters and centimeters, and we also had to consider the size of the resolution. Last time I was full of confidence. I made a resume cover by myself. The effect of the picture is very good, but the paper printout is blurry and ugly. Today I specially studied this problem. In fact, it is not difficult. The analysis is as follows. The size of the paper is *, that is, .c*.c, And inches.c, when the resolution is pixels/inch, we convert it into pixels/cm, which is..., now, when we convert it into pixels when making pictures, it is (*.)*(.*.), that is :* (unit is pixels) In the same way, we can get that when the resolution is pixels/inch, the size is * (unit is pixels) when the resolution is pixels/inch, the size is *. (The unit is pixels) So if you want to print out the picture you made, it is best to convert it first, otherwise the picture quality is likely to be reduced! Generally speaking, if it is a printed matter, it is best to use pixels/inch. If it is a printer or inkjet printing, you can choose the resolution of pixels/inch. *
*
*
*
Specifications: *
Unit is millimeters