The biggest difference between A3 paper and A4 paper is that the paper size is different. a3:297×420mm； A4: 2 10× 297mm。 A3 paper refers to the international standard A3 paper, the size of which is 297mm×420mm, which is twice that of A4 paper.

Main uses of A4 paper and A3 paper: The main uses of A4 paper are: As the most commonly used office copy paper, it has a wide range of functions, such as printing and copying office documents, promotional materials, contracts and so on. , usually used as draft paper. The main uses of A3 paper are: the size of A3 copy paper is exactly half that of A2, which is generally used for small-size drawing and widely used in copy shops.

According to the size, folio is usually divided into three types: large format, medium format and small format. For 787× 1092 paper, 12 format is large format, 16 ~ 36 format is medium format, and 40 format is small format, but books with mainly characters are generally medium format.

Folio shapes are rectangles with different proportions except 6 quarts, 12 quarts, 20 quarts, 24 quarts and 40 quarts, which are suitable for books with different properties and uses.

Types of office paper

1, inkjet printing paper

Ink-jet printing paper is specially designed for ink-jet printing, so the printing quality is also high, much better than ordinary copy paper. Mainly used for laser printing, CAD printing, hot melt printing, xerography and fax.

2. Computer printing paper

Computer printing paper is divided into one layer, two layers, three layers, four layers and five layers, which are mainly used in mobile phone business halls and banks. Be clear about the number of floors you need when purchasing, and be sure to choose the wrong one.

Step 3 copy paper

Copy paper is widely used, which can be used for laser printing paper, needle printer, copier, inkjet printer and other materials with low requirements on output effect, mainly used for tables, copied texts, legends and so on.

4. carbon paper

Carbon paper is divided into carbon powder carbon paper and carbonless carbon paper. Mostly used as joint documents and bills. Toner carbon paper can be used for pens, pencils, typewriters, etc., and can be transferred to plain paper. But there is a disadvantage that it is easy to get on hands and clothes. Carbonless copy paper is a kind of hidden color copy, which can be developed directly by writing on it with a pen.

5, thermal printing paper

Thermal paper is a kind of processing paper, also known as thermal paper, thermal paper and thermal paper. Its principle is to coat a layer of "thermal paint" on high-quality base paper, which is mainly used for faxes, receipts, trademarks, ECG paper and so on.

6. Cash register paper

For ordinary needle printers, you can use ordinary 1-3 layers of printing paper to print; For thermal head printers, only thermal printing paper can be used for printing. Cashier paper is a roll of paper used by cash registers to record cashier details, and its main function is to provide customers with a detailed shopping list.