Support post with improved axial strength
An improved support post for cushioning and supporting large products is provided. The post is made from a non-rectangular sheet that is convolutely wound around a mandrel and shaped into a desired cross-sectional shape. The post has a higher axial compression strength than a conventional post.
1. A corner post for protecting and cushioning a product, the corner post made from a single sheet of paper convolutely wound into an elongated hollow tube, the corner post comprising:
a top section having a thickness;
a top edge defined by multiple layers of paper;
a bottom section having a thickness;
a bottom edge defined by multiple layers of paper;
the top and bottom edges defining parallel planes; and
a middle section interposed between the top and bottom sections, the middle section having a thickness greater than the thickness of the top and bottom
wherein the single sheet of paper has a non-rectangular tessellating shape; and
wherein the post has a substantially L-shaped cross-sectional profile.
2. The post of claim 1 wherein the cross-sectional thickness increases continuously along the length of the post beginning at the ends and moving toward the middle section.
3. The post of claim 1 wherein the cross-sectional thickness increases stepwise along the length of the post beginning at the ends and moving toward the middle section.
4. The post of claim 1 wherein the sheet has a straight top edge that forms the top end of the post, a straight bottom edge that forms the bottom end of the post, a straight leading side edge that forms a straight lap seam on the inner surface of the post, and a non-straight trailing edge that forms a seam on the outer surface of the post.
5. The post of claim 4 wherein the sheet is made from paper and the straight leading edge is parallel to the sheet machine direction.
6. The corner post of claim 1 wherein the sheet is pentagonal and comprises a straight side edge, a top edge, a bottom edge and a V-shaped trailing edge comprising two shorter angled edges.
7. The corner post of claim 1 wherein the sheet is octagonal and comprises a straight leading edge, a top edge, a bottom edge and a stepped trailing portion having a height shorter than the height of the rest of the sheet.