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1. Cartons are made of paper at all levels. The reasonable distribution of paper is the basic condition to ensure the compressive strength of cartons. By checking the physical function of each laye
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General carton: Generally speaking, it is a three framed box, that is, a carton made of three layers of paper "the outer surface paper, the central corrugated paper and the innermost box board
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Card board can be divided into single-sided card board (four sides into forklift), double-sided card board (two sides into forklift). Most of the cards are of Sichuan type. Use of card board: card