摘要 |
PURPOSE: A grain sack and a manufacturing method thereof are provided to prevent the color change and the degeneration of grains by protecting the grains from the moisture using a complex kraft paper layer. CONSTITUTION: A grain sack(1) includes a normal kraft paper layer(10), and a complex kraft paper layer(20). The normal kraft paper layer is formed by overlapping two sheets of kraft paper(10a,10b). The complex kraft paper layer is formed on the outside of the normal kraft paper layer, and includes another page of kraft paper(10c) and a PE bonding layer(20b). The PE bonding layer prevents water from being inserted into the sack.
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