| 摘要 |
PURPOSE: An environment friendly lightweight board using wastepaper is provided to minimize safety accidents by making the board light. CONSTITUTION: An environment friendly lightweight board using wastepaper comprises a floor(11), a lid(21) and a concavo-convex part. A lib(12) of the fixed height is formed on the inner floor at a tilt. A plurality of projection insertion grooves(13) is composed in the inner surface of the floor. A protrusion(22) is inserted in the projection insertion groove. The elevation of a long wall(23) of concavo-convex part and a short wall(24) is same as the lib. The width of the inside of the concavo-convex part is bigger than the floor.
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