This specification covers the requirements for a document storage box which is one piece, shipped flat, self locking, and made from low lignin corrugated board. Assembly shall be self locking. Assembly shall not include adhesive or metal fasteners. Construction shall be such that the self locking walls are double thickness and alternate, that is, when the box is closed, both side walls and front wall shall be double thickness.
All fold lines are to be scored or crimped, with no perforations.
When the paperboard is scored twice to assemble a double wall, the space between parallel scores shall not exceed two board thicknesses. A shallow thumb cut shall be centered on the outside foredge. The spine of the box shall be cut so that it is flush with the side walls when the assembled box is closed. All box sizes shall be constructed from the same corrugated board type. All layers of the corrugated paperboard laminate shall be made from cotton or linen pulp, fully bleached chemical wood pulp, or a mixture.