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Apparatus and method for forming a stackable container from a container blank. The apparatus generally includes a blank feeder configured to place the blank on a conveyor, an index folder configured to pre-fold a plurality of inner fold-down flaps and an index flap over each of two opposing sidewall

Apparatus and method for forming a stackable container from a container blank. The apparatus generally includes a blank feeder configured to place the blank on a conveyor, an index folder configured to pre-fold a plurality of inner fold-down flaps and an index flap over each of two opposing sidewall flaps of the blank, and a pressure former configured to attach a first leading extension to a leading wall of the blank and a first trailing extension to a trailing wall of the blank, wherein the first leading extension and the first trailing extension are foldably attached at an angle of about 90 degrees to one of the inner fold-down flaps or one of the sidewall flaps. Embodiments of the present the present invention can advantageously provide a reliable approach for forming a container from a blank with relatively fewer folding defects.

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What is claimed is: 1. An apparatus for forming a stackable container from a container blank, said apparatus comprising: a blank feeder configured to place said blank on a conveyor; plow structures configured to fold two opposing sidewalls of said container blank at an angle of approximately 90 deg

What is claimed is: 1. An apparatus for forming a stackable container from a container blank, said apparatus comprising: a blank feeder configured to place said blank on a conveyor; plow structures configured to fold two opposing sidewalls of said container blank at an angle of approximately 90 degrees with respect to a base of said container blank; an index folder comprising two parallel holding members and two folding members parallel to said holding members, said index folder configured to pre-fold a plurality of fold-down flaps and an index flap over each opposing sidewall flap of said two opposing sidewalls, each of said holding members contacting an inner surface of one of said opposing sidewall flaps below a first fold line between said index flap and said sidewall flap and approximately at a second fold line between said sidewall flap and at least one of said fold-down flaps, and each of said folding members configured to push against an outer surface of said plurality of fold-down flaps and said index flap above said first and second fold lines, wherein said index flap is configured to form an index tab protruding above said second fold line when folded at an angle of 180° with respect to said sidewall flap; and a pressure former configured to attach a first leading extension to a leading wall of said blank and a first trailing extension to a trailing wall of said blank, wherein said first leading extension and said first trailing extension are foldably attached at an angle of about 90 degrees to one of said fold-down flaps or one of said sidewall flaps. 2. The apparatus of claim 1, wherein each of said holding members comprises a straight section along the length of said sidewall flap. 3. The apparatus of claim 2, wherein each of said holding members further comprises a guide section angled away from said inner surface of said sidewall flap. 4. The apparatus of claim 1, wherein said conveyor is configured to move said blank from said blank feeder to said index folder, and from said index folder to said pressure former. 5. The apparatus of claim 1, wherein said first leading extension is foldably attached at an angle of approximately 90 degrees to an edge of said sidewall flap nearest said leading wall and said first trailing extension is foldably attached at an angle of approximately 90 degrees to an edge of said sidewall flap nearest said trailing wall. 6. The apparatus of claim 5, wherein said pressure former is further configured to attach a second leading extension foldably attached to one of said fold-down flaps to said first extension and to attach a second trailing extension foldably attached to one of said fold-down flaps to said first trailing extension. 7. The apparatus of claim 6, wherein said second leading extension and said second trailing extension each comprise a corner post section and an attachment section, wherein said corner post section is foldably attached to one of said fold-down flaps and said attachment section is foldably attached to said corner post section. 8. The apparatus of claim 7, wherein said pressure former is further configured to: fold each of said corner post sections at an angle of from 30 degrees to 60 degrees with respect to one of said sidewall flaps; fold each of said attachment sections at an angle of approximately 90 degrees with respect to one of said sidewall flaps; and attach each of said attachment sections to one of said first leading extensions or said first trailing extensions. 9. The apparatus of claim 8, wherein said pressure former further comprises a press configured to push one of said attachment sections against one of said first leading extensions or said first trailing extensions. 10. The apparatus of claim 1, further comprising an adhesive applicator configured to apply adhesive to one or more surfaces of said blank. 11. The apparatus of claim 10, wherein said adhesive comprises adhesive tape and/or hot-melt glue. 12. The apparatus of claim 1, wherein said blank feeder comprises at least one picker arm having a plurality of vacuum cups mounted thereon. 13. The apparatus of claim 12, wherein said picker arm is configured to pull said blank between said plow structures and fold said sidewalls at an angle of approximately 90 degrees with respect to said base. 14. The apparatus of claim 1, wherein the holding member has a length about equal to a length of the folding member. 15. The apparatus of claim 14, wherein the length of the holding member and the folding member is greater than or equal to a length of the sidewall of the container blank. 16. A method for forming a stackable container from a container blank, said method comprising the steps of: placing said blank on a conveyor; folding opposing sidewalls of said container blank at an angle of approximately 90 degrees with respect to a base of said container blank; pre-folding a plurality of fold-down flaps and an index flap over each of two opposing sidewall flap of said opposing sidewalls, comprising placing a holding member against an inner surface of said each opposing wall flap below a first fold line between said index flap and said sidewall flap and approximately at a second fold line between said sidewall flap and said fold-down flaps, and pushing a folding member against an outer surface of said plurality of fold-down flaps and said index flap of each opposing sidewall above said first and second fold lines, wherein said folding member is parallel to said holding member, and said index flap is configured to form an index tab protruding above said second fold line when folded at an angle of 180° with respect to said sidewall flap; and attaching a first leading extension to a leading wall of said blank and a first trailing extension to a trailing wall of said blank, wherein said first leading extension and said first trailing extension are foldably attached at an angle of about 90 degrees to one of said fold-down flaps or one of said sidewall flaps. 17. The method of claim 16, further comprising moving said blank on said conveyor from a blank feeder configured to perform said placing to an index folder configured to perform said pre-folding, and from said index folder to a pressure former configured to perform said attaching. 18. The method of claim 16, wherein said attaching further comprises: folding said first leading extension at an angle of approximately 90 degrees to an edge of said sidewall flap nearest leading wall; and folding said first trailing extension at an angle of approximately 90 degrees to an edge of said sidewall flap nearest said trailing wall. 19. The method of claim 18, further comprising: attaching a second leading extension foldably attached to one of said fold-down flaps to said first extension; and attaching a second trailing extension foldably attached to one of said fold-down flaps to said first trailing extension. 20. The method of claim 19, wherein said second leading extension and said second trailing extension each comprise a corner post section and an attachment section, wherein said corner post section is foldably attached to one of said fold-down flaps and said attachment section is foldably attached to said corner post section. 21. The method of claim 20, further comprising: folding each of said corner post sections at an angle of from 30 degrees to 60 degrees with respect to one of said sidewall flaps; folding each of said attachment sections at an angle of approximately 90 degrees with respect to one of said sidewall flaps; and attaching each of said attachment sections to one of said first leading extensions or said first trailing extensions. 22. The method of claim 21, further comprising pushing one of said attachment sections against one of said first leading extensions or said first trailing extensions. 23. The method of claim 16, further comprising applying adhesive to one or more surfaces of said blank. 24. The method of claim 22, wherein said adhesive comprises adhesive tape and/or hot-melt glue. 25. The method of claim 16, wherein said placing comprises: forming a negative pressure in a plurality of vacuum cups attached to at least one picker arm; applying said vacuum cups to said blank; and pulling said blank between plow structures, thereby folding said sidewalls at an said angle of approximately 90 degrees with respect to said base. 26. The method of claim 16, wherein the holding member has a length about equal to a length of the folding member. 27. The method of claim 26, wherein the length of the holding member and the folding member is greater than or equal to a length of the sidewall of the container blank.