| 摘要 |
PURPOSE: A two ply moisture-proof paper bag is provided to keep sugar for a long time by a superior moisture-proof function, thereby cutting 30% of a price of sugar. CONSTITUTION: A water adhesive is horizontally spread on a paper(21) in a stripe shape and a synthetic resin film(22) is attached to the spread adhesive in a two ply moisture-proof paper bag. Upper/lower openings are covered by outer paper covers. An inner cover is made of the synthetic resin film. The outer paper covers are made of a craft paper whose impact strength is vertically 200~280 and horizontally 300~380 based on KS M7501. |
