Bendable corrugated paperboard
AssigneeInternational Paper Company
InventorCharles J. Machery
Life of this patent
Estimating the term…
Abstract
This invention provides a paperboard with an improved score line, the method for making the improved score line, and the apparatus for imparting the improved score line. The score line makes the process of folding a flat paperboard into a corner an easier and more consistent process. The score is a V-shaped groove fashioned from a bar score line flanked by two parallel slit cut lines. The method for creating the score line includes utilizing different scoring hubs for bar scoring and slit scoring the paperboard. The apparatus for creating the bar score is a four shaft slitter-scorer having multiple shafts in series, wherein each shaft has at least one hub for slit scoring, bar scoring or supporting the paperboard.
Claims10
A paperboard blank having a predetermined thickness and having at least one score line formed in one surface thereof to form a corner of a container when the blank is folded about said score line, said score line comprising two spaced apart, substantially parallel cut lines extending more than half way through the thickness of the blank to delineate a section of material between the cut lines, and a V-shaped depression formed in the section of material between and substantially parallel to the cut lines, said V-shaped depression having a depth approximately one-half the thickness of the blank and defining a tuck portion between the depression and each respective adjacent cut line, whereby when the blank is folded about said score line to form a corner, said tuck portions are compressed and folded together at said V-shaped depression with said cut lines lying in substantial contiguous relationship to one another to form an interior corner that is essentially a line, free of material protruding into the interior corner.
A paperboard container having an interior surface and an exterior surface and having at least two sides folded about a score line to form a corner, said at least two sides having a predetermined thickness, and said score line comprising:
- two spaced apart, substantially parallel cut lines made in said interior surface, extending through a majority of the thickness, delineating a section of material between the cut lines;
- and
- a V-shaped depression formed in the section of material between and substantially parallel to the cut lines, said V-shaped depression defining a tuck portion between the depression and each respective adjacent cut line, said tuck portions being compressed and folded together at said V-shaped depression, with said cut lines lying in substantially contiguous relationship to one another, forming an interior corner that is essentially a line, free of material protruding into the interior corner.
Dependencies are inferred from the claim text.