Is the paper jam hard or soft?

Paper jams are hard and soft. Cardboard generally refers to a slightly thick cardboard with a certain hardness, and soft cardboard is a slightly thin cardboard. Cardboard is a kind of thick paper between paper and cardboard, and its weight per square meter exceeds 120g. It is used for postcards, cards, album liners and so on. The paper is fine and smooth, strong and wear-resistant. Cardboard is divided into blue-white single-sided copper card and white-gray bottom copper card. Blue and white double-sided coated paper is obtained by full chemical bleaching, which is divided into western coated paper and copper sika.

Use of cardboard

Cardboard is mainly used to print business cards, and business cards printed with white cardboard are more durable. Cardboard can be used to print certificates, invitations and covers. Desk calendars and postal postcards are also printed on white cardboard. From these aspects, we can see that cardboard is really widely used in life.

White cardboard is divided into paper, cardboard and cardboard, and the division is finer. Although the name white cardboard is white on the surface, the whiteness of cardboard is also very high. The whiteness of grade A white paperboard is not less than 92%, grade B white paperboard is not less than 87%, and grade C white paperboard is not less than 82%.