How many kinds of cardboard?
There are several kinds of binding cardboard(1) grey cardboard. Also called the book sealed shell board, is the national industry business book sealed shell cardboard.(2) straw paperboard. Also known as mafen paerboard, rough surface of our early yellow book sealed shell cardboard(3) yellow paperboard. A surface is smooth, and yellow smoke (same color hard, rigid kraft paper board, commonly used in the production of binding envelope is also used in the making of book sealed shell
Divided cattle card with two white kraft, kraft with cattle and the white card is divided into five layers, three layers, four layers of cardboard.
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