According to the purpose, paper can be roughly divided into four categories: cultural paper, industrial and agricultural technology paper, packaging paper and household paper. The types of packaging paper are:

① Ordinary paper, kraft paper, cellophane, neutral packaging paper, paper bag paper, parchment, etc.

② Special paper gloss paper, wet strength paper, grease proof paper, tea bag paper, high-grade telescopic paper, etc.

③ Decorative paper surface float and sink paper, embossed paper, coated paper, offset paper, etc.

④ Deep processing paper, vacuum aluminized paper, antirust paper, paraffin paper, asphalt paper, etc.

Paperboard is also generally divided into four categories: packaging paperboard, industrial technology paperboard, construction paperboard and printing and decoration paperboard. The types of cardboard used for packaging are:

① Ordinary paperboard, whiteboard, yellow board, carton board, etc.

② Deep processing of corrugated base paper, corrugated board, etc.

In terms of packaging, paper is mainly used for packaging goods, making handbags and printing decoration trademarks; Cardboard is mainly used to produce cartons, cartons, paper drums and other packaging containers.

The specification and size of paper and paperboard (unit: mm) have two requirements according to their different forms.

Flat paper requires length and width, and its format size is 787mm × 1092mm， 850mmx1168mm，880mm × 1230mm, according to the needs of users, can produce many special sizes of paper and paperboard.

Specifying the size standard of paper and paperboard is very important to realize the standardization and serialization of paper containers such as cartons, cartons and paper barrels.

As long as the web is wide, the domestic web mainly has 1575mm (i.e. 2x787mm), 1092mm, 880mm, 787mm and other specifications, and the length is generally 6000m.

Generally speaking, 500 sheets of paper below 250G / m * are used as a ream, and several reams are used as a piece, and each piece generally does not exceed 250kg; How many reams a piece of cardboard above 250G / m or how many sheets each ream depends on the gram weight of the paper. Each piece of web paper is generally 250 ~ 350kg, and the maximum is no more than 1t.