CA2938554C

Reinforced polygonal containers and blanks, methods, and machine for making the same

Abstract

A method of forming a polygonal container from a blank of sheet material using a machine, the blank including a bottom panel having opposing side edges and opposing end edges, two opposing side panels each extending from one of the side edges of the bottom panel, two opposing end panels each extending from one of the end edges of the bottom panel, and a reinforcing panel assembly including a plurality of reinforcing panels separated by a plurality of fold lines, the reinforcing panel assembly extending from a first side edge of a first side panel of the two side panels, the machine including a hopper station, a corner post forming station, and a plunger station, said method comprising: rotating the reinforcing panel assembly upwardly about a first fold line of the plurality of fold lines toward the first side panel as the blank is transported from the hopper station to the corner post forming station, an exterior surface of the blank facing downward within the hopper station; forming a corner wall and a reinforcing end tab by folding the plurality of reinforcing panels about the plurality of fold lines as the blank is transported through the corner post forming station to the plunger station; rotating the side panels and the end panels to be substantially perpendicular to the bottom panel by directing the blank through the plunger station; and coupling the reinforcing end tab to one of the end panels to form the container.

CA2938554C, drawing sheet 1
Sheet 1 of 45

Term

2.6 yearsleft in the term

Expires 7 May 2029.

  1. Priority and filed
  2. Granted
  3. Today
  4. Expires

33 claims: 15 independent, 18 dependent

  1. 1
    CA 2938554 2017-03-13 What is claimed is:1. A method of forming a polygonal container from a blank of sheet material using a machine, the blank including a bottom panel having opposing side edges and opposing end edges, two opposing side panels each extending from one of the side edges of the bottom panel, two opposing end panels each extending from one of the end edges of the bottom panel, and a reinforcing panel assembly including a plurality of reinforcing panels separated by a plurality of fold lines, the reinforcing panel assembly extending from a first side edge of a first side panel of the two side panels, the machine including a hopper station, a comer post forming station, and a plunger station, said method comprising: rotating the reinforcing panel assembly upwardly about a first fold line of the plurality of fold lines toward the first side panel as the blank is transported from the hopper station to the comer post forming station, an exterior surface of the blank facing downward within the hopper station;forming a comer wall and a reinforcing end tab by folding the plurality of reinforcing panels about the plurality of fold lines as the blank is transported through the comer post forming station to the plunger station, the reinforcing end tab comprising two panels of the plurality of reinforcing panels in face-to-face contact;rotating the side panels and the end panels to be substantially perpendicular to the bottom panel by directing the blank through the plunger station;and coupling the reinforcing end tab to one of the end panels to form the container.
  2. 2
    A method in accordance with claim 1 wherein the reinforcing panel assembly includes an outer reinforcing panel extending from the first side edge of the first side panel, an inner reinforcing panel extending from a side edge of the outer reinforcing panel, and an inner side panel extending from a side edge of the inner reinforcing panel, said forming a comer wall and a reinforcing end tab further comprising:maintaining an angle between the outer reinforcing panel and the first side panel using at least one lower rail of the comer post forming station;rotating the inner reinforcing panel toward an interior surface of the outer reinforcing panel using a first upper rail of the comer post forming station;and rotating the inner side panel toward an exterior surface of the inner reinforcing panel by causing the inner side panel to contact a stop plate of the comer post forming station as the blank is transported through the comer post forming station. -63CA 2938554 2017-03-13
  3. 3
    A method in accordance with claim 2 wherein the outer reinforcing panel includes a comer panel extending from the first side edge of the first side panel and a first reinforcing end panel extending from a side edge of the comer panel, and the inner reinforcing panel includes a second reinforcing end panel extending from a side edge of the first reinforcing end panel and an inner reinforcing comer panel extending from a side edge of the second reinforcing end panel, the inner side panel extending from a side edge of the inner reinforcing comer panel, said forming a comer wall and a reinforcing end tab further comprising:rotating the interior surface of the inner reinforcing panel into face-to-face contact with the interior surface of the outer reinforcing panel;rotating an interior surface of the inner side panel into contact with an interior surface of the first side panel as the blank is transported past the stop plate;and rotating the first reinforcing end panel and the second reinforcing end panel toward the reinforcing comer panel by transporting the blank past a second upper rail of the comer post forming station.
  4. 4
    A method in accordance with claim 3 further comprising applying an adhesive to the interior surface of the first side panel by transporting the blank past a first adhesive applicator of the comer post forming station before rotating the interior surface of the inner side panel into contact with the interior surface of the first side panel.
  5. 5
    A method in accordance with claim 3 or 4 wherein:maintaining an angle between the outer reinforcing panel and the first side panel further comprises maintaining an angle of about 135° between the outer reinforcing panel and the first side panel;and rotating the first reinforcing end panel and the second reinforcing end panel toward the reinforcing comer panel further comprises rotating the first reinforcing end panel and the second reinforcing end panel toward the reinforcing comer panel to define an angle of about 135° between the second reinforcing end panel and the reinforcing comer panel.
  6. 6
    A method in accordance with any one of claims 1 to 5 wherein rotating the side panels and the end panels to be substantially perpendicular to the bottom panel further comprises:forcing the blank downward through a plunger opening by applying a force to -64CA 2938554 2017-03-13 the bottom panel using a plunger located at the plunger station;applying a first force to an exterior surface of the two end panels using end panel plow assemblies located at the plunger station;and applying a second force to an exterior surface of the two side panels using side panel plows located at the plunger station.
  7. 7
    A method in accordance with claim 6 wherein applying a first force to an exterior surface of the two end panels using end panel plow assemblies further comprises:rotating a frame of each end panel plow assembly toward the plunger opening as the plunger forces the blank downward;and pressing an interior surface of a first end panel of the two end panels into contact with an exterior surface of the reinforcing end tab using at least one of a glue roller and a glue plate of a first end panel plow assembly.
  8. 8
    A method in accordance with claim 6 wherein the blank includes at least one outer reinforcing comer panel extending from a first side edge of a first end panel of the two end panels and the reinforcing panel assembly includes a comer panel extending from the first side edge of the first side panel, said method further comprising:applying adhesive to at least one of an interior surface of the at least one outer reinforcing comer panel and an exterior surface of the comer panel;rotating the at least one outer reinforcing comer panel toward the exterior surface of the comer panel by applying a third force to the at least one outer reinforcing comer panel using a comer pusher located at the plunger station;and pressing the at least one outer reinforcing panel into contact with the comer panel with the comer pusher to secure the at least one outer reinforcing panel to the comer panel using the adhesive.
  9. 9
    A method in accordance with any one of claims 1 to 8 wherein rotating the reinforcing panel assembly further comprises:grasping an exterior surface of the bottom panel with a feed mechanism of the hopper station;pulling the blank from a hopper of the hopper station in a downward direction using the feed mechanism;applying a restraining force to the reinforcing panel assembly at the hopper to rotate the reinforcing panel assembly toward an interior surface of the first side panel;-65CA 2938554 2017-03-13 supporting the reinforcing panel assembly at a predetermined angle to the first side panel using a plow within the hopper station;and transporting the blank into the comer post forming station using the feed mechanism in a substantially horizontal direction.
  10. 10
    A method in accordance with any one of claims 1 to 9, wherein the blank includes four reinforcing panel assemblies, each reinforcing panel assembly extending from a side edge of a respective side panel, said method further comprising:rotating each reinforcing panel assembly upwardly about a respective fold line toward a respective side panel as the blank is transported from the hopper station to the comer post forming station;forming a comer wall and a reinforcing end tab from each of the four reinforcing panel assemblies by folding the plurality of reinforcing panels of each reinforcing panel about the plurality of fold lines as the blank is transported through the comer post forming station to the plunger station;coupling each of four reinforcing end tabs to one of the end panels to form the container.
  11. 11
    A method of forming a polygonal container from a blank of sheet material using a machine, the blank including a bottom panel having opposing side edges and opposing end edges, two opposing side panels each extending from one of the side edges of the bottom panel, two opposing end panels each extending from one of the end edges of the bottom panel, and a reinforcing panel assembly including a plurality of reinforcing panels separated by a plurality of fold lines, the reinforcing panel assembly extending from a first side edge of a first side panel of the two side panels, the machine including a hopper station, a comer post forming station, and a plunger station, said method comprising:rotating the reinforcing panel assembly upwardly about a first fold line of the plurality of fold lines toward the first side panel as the blank is transported from the hopper station to the comer post forming station, an exterior surface of the blank facing downward within the hopper station;forming a comer wall and a reinforcing end tab by folding the plurality of reinforcing panels about the plurality of fold fines as the blank is transported through the comer post forming station to the plunger station;rotating the side panels and the end panels to be substantially perpendicular to the bottom panel by directing the blank through the plunger station;and -66CA 2938554 2017-03-13 coupling the reinforcing end tab to one of the end panels to form the container;wherein the reinforcing panel assembly includes an outer reinforcing panel extending from the first side edge of the first side panel, an inner reinforcing panel extending from a side edge of the outer reinforcing panel, and an inner side panel extending from a side edge of the inner reinforcing panel, said forming a comer wall and a reinforcing end tab further comprising: maintaining an angle between the outer reinforcing panel and the first side panel using at least one lower rail of the comer post forming station;rotating the inner reinforcing panel toward an interior surface of the outer reinforcing panel using a first upper rail of the comer post forming station;and rotating the inner side panel toward an exterior surface of the inner reinforcing panel by causing the inner side panel to contact a stop plate of the comer post forming station as the blank is transported through the comer post forming station;and wherein the outer reinforcing panel includes a comer panel extending from the first side edge of the first side panel and a first reinforcing end panel extending from a side edge of the comer panel, and the inner reinforcing panel includes a second reinforcing end panel extending from a side edge of the first reinforcing end panel and an inner reinforcing comer panel extending from a side edge of the second reinforcing end panel, the inner side panel extending from a side edge of the inner reinforcing comer panel, said forming a comer wall and a reinforcing end tab further comprising: rotating the interior surface of the inner reinforcing panel into faceto-face contact with the interior surface of the outer reinforcing panel;rotating an interior surface of the inner side panel into contact with an interior surface of the first side panel as the blank is transported past the stop plate;and rotating the first reinforcing end panel and the second reinforcing end panel toward the reinforcing comer panel by transporting the blank past a second upper rail of the comer post forming station.
  12. 12
    A method in accordance with claim 11 further comprising applying an adhesive to the interior surface of the first side panel by transporting the blank past a first adhesive applicator of the comer post forming station before rotating the interior surface of the inner side panel into contact with the interior surface of the first side panel. -67CA 2938554 2017-03-13
  13. 13
    A method in accordance with claim 11 or 12 wherein maintaining an angle between the outer reinforcing panel and the first side panel further comprises maintaining an angle of about 135° between the outer reinforcing panel and the first side panel;and rotating the first reinforcing end panel and the second reinforcing end panel toward the reinforcing comer panel further comprises rotating the first reinforcing end panel and the second reinforcing end panel toward the reinforcing comer panel to define an angle of about 135° between the second reinforcing end panel and the reinforcing comer panel.
  14. 14
    A method in accordance with any one of claims 11 to 13 wherein rotating the side panels and the end panels to be substantially perpendicular to the bottom panel further comprises:forcing the blank downward through a plunger opening by applying a force to the bottom panel using a plunger located at the plunger station;applying a first force to an exterior surface of the two end panels using end panel plow assemblies located at the plunger station;and applying a second force to an exterior surface of the two side panels using side panel plows located at the plunger station.
  15. 15
    A method in accordance with claim 14 wherein applying a first force to an exterior surface of the two end panels using end panel plow assemblies further comprises:rotating a frame of each end panel plow assembly toward the plunger opening as the plunger forces the blank downward;and pressing an interior surface of a first end panel of the two end panels into contact with an exterior surface of the reinforcing end tab using at least one of a glue roller and a glue plate of a first end panel plow assembly.
  16. 16
    A method in accordance with claim 14 wherein the blank includes at least one outer reinforcing comer panel extending from a first side edge of a first end panel of the two end panels and the reinforcing panel assembly includes a comer panel extending from the first side edge of the first side panel, said method further comprising:applying adhesive to at least one of an interior surface of the at least one outer reinforcing comer panel and an exterior surface of the comer panel;-68CA 2938554 2017-03-13 rotating the at least one outer reinforcing comer panel toward the exterior surface of the comer panel by applying a third force to the at least one outer reinforcing comer panel using a comer pusher located at the plunger station;and pressing the at least one outer reinforcing panel into contact with the comer panel with the comer pusher to secure the at least one outer reinforcing panel to the comer panel using the adhesive.
  17. 17
    A method in accordance with any one of claims 11 to 16 wherein rotating the reinforcing panel assembly further comprises:grasping an exterior surface of the bottom panel with a feed mechanism of the hopper station;pulling the blank from a hopper of the hopper station in a downward direction using the feed mechanism;applying a restraining force to the reinforcing panel assembly at the hopper to rotate the reinforcing panel assembly toward an interior surface of the first side panel;supporting the reinforcing panel assembly at a predetermined angle to the first side panel using a plow within the hopper station;and transporting the blank into the comer post forming station using the feed mechanism in a substantially horizontal direction.
  18. 18
    A method in accordance with any one of claims 11 to 17, wherein the blank includes four reinforcing panel assemblies, each reinforcing panel assembly extending from a side edge of a respective side panel, said method further comprising:rotating each reinforcing panel assembly upwardly about a respective fold line toward a respective side panel as the blank is transported from the hopper station to the comer post forming station;forming a comer wall and a reinforcing end tab from each of the four reinforcing panel assemblies by folding the plurality of reinforcing panels of each reinforcing panel about the plurality of fold lines as the blank is transported through the comer post forming station to the plunger station;and coupling each of four reinforcing end tabs to one of the end panels to form the container.
  19. 19
    A machine for forming a polygonal container from a blank of sheet material, the blank including a bottom panel having opposing side edges and opposing end edges, two opposing side panels each extending from one of the side edges of the -69CA 2938554 2017-03-13 bottom panel, two opposing end panels each extending from one of the end edges of the bottom panel, and a reinforcing panel assembly including a plurality of reinforcing panels separated by a plurality of fold lines, the reinforcing panel assembly extending from a first side edge of a first side panel of the two side panels, said machine comprising:a hopper station configured to rotate the reinforcing panel assembly upwardly about a first fold line of the plurality of fold lines toward the first side panel, an exterior surface of the blank facing downward within said hopper station;a comer post forming station configured to form a partially formed container from the blank by folding the plurality of reinforcing panels about the plurality of fold lines, the partially formed container including a comer wall and a reinforcing end tab formed from the reinforcing panel assembly;and a plunger station configured to rotate the side panels and the end panels to be substantially perpendicular to the bottom panel and to couple the reinforcing end tab to one of the end panels to transform the partially formed container into the container, said plunger station comprising: a plurality of plows configured to rotate the side panels and the end panels toward an interior surface of the bottom panel to form side walls and end walls of the container, said plurality of plows adjacent to a plunger opening;and a plunger having a cross-sectional shape corresponding to a crosssectional shape of the container and being vertically movable through said plunger opening, said plunger configured to contact the interior surface of the bottom panel and to push the partially formed container downward through said plunger opening and past said plurality of plows.
  20. 20
    A machine in accordance with claim 19 wherein the reinforcing panel assembly includes an outer reinforcing panel extending from the first side edge of the first side panel, an inner reinforcing panel extending from a side edge of the outer reinforcing panel, and an inner side panel extending from a side edge of the inner reinforcing panel, said comer post forming station comprises:a transport system for transporting the blank downstream from said hopper station toward said plunger station;a first rail set adjacent said hopper station and configured to fold the outer reinforcing panel and the inner reinforcing panel into face-to-face contact about the plurality of fold lines and said transport system transports the blank downstream;and a second rail set adjacent said plunger station and configured to fold the outer reinforcing panel and the inner reinforcing panel about the plurality of fold lines to -70CA 2938554 2017-03-13 form the comer wall and the reinforcing end tab said second rail set downstream from said first rail set.
  21. 21
    A machine in accordance with claim 20 wherein said first rail set comprises:an upper rail configured to rotate the inner reinforcing panel toward an interior surface of the outer reinforcing panel by contacting an exterior surface of at least one of the inner reinforcing panel and the inner side panel;a first lower rail configured to maintain a position of the outer reinforcing panel with respect to the first side panel by contacting an interior surface of the outer reinforcing panel;and a second lower rail configured to maintain the position of the outer reinforcing panel with respect to the first side panel by contacting an exterior surface of the outer reinforcing panel.
  22. 22
    A machine in according with claim 21 further comprising a stop plate adjacent to said first rail set, said upper rail configured to rotate the inner side panel toward said stop plate, and said stop plate configured to apply a force to an interior surface of the inner side panel to rotate the inner side panel toward the exterior surface of the inner reinforcing panel.
  23. 23
    A machine in accordance with claim 20 wherein the outer reinforcing panel includes a comer panel extending from the first side edge of the first side panel and a first reinforcing end panel extending from a side edge of the comer panel, and the inner reinforcing panel includes a second reinforcing end panel extending from a side edge of the first reinforcing end panel and an inner reinforcing comer panel extending from a side edge of the second reinforcing end panel, the inner side panel extending from a side edge of the inner reinforcing comer panel, said second rail set comprising:an upper rail configured to rotate the first reinforcing end panel and the second reinforcing end panel toward an exterior surface of the reinforcing comer panel by contacting an exterior surface of the first reinforcing end panel, wherein the first reinforcing end panel and the second reinforcing end panel are in face-to-face contact;and a lower rail configured to maintain a position of the comer panel and the reinforcing comer panel with respect the first side panel by contacting an exterior surface of the comer panel, wherein the comer panel and the reinforcing comer panel are in face-to-face contact. -71CA 2938554 2017-03-13
  24. 24
    A machine in accordance with claim 23 wherein said lower rail of said second rail set comprises a lower rail of said first rail set.
  25. 25
    A machine in accordance with claim 23 or 24 further comprising a series of rollers adjacent said second rail set, said series of rollers comprising at least one angled roller and at least one vertical roller, said angled roller configured to contact an exterior surface of the reinforcing comer panel for maintaining an angle between at least the reinforcing comer panel and the first side panel, and said vertical roller configured to contact at least an exterior surface of the inner side panel to facilitate securing the inner side panel to the first side panel.
  26. 26
    A machine in accordance with any one of claims 19 to 25 wherein said plurality of plows comprises:at least one pair of side panel plows configured to rotate the first side panel toward the interior surface of the bottom panel by contacting an exterior surface of the first side panel;and at least one end panel plow assembly configured to rotate a first end panel of the two end panels toward the interior surface of the bottom panel by contacting an exterior surface of the first end panel.
  27. 27
    A machine in accordance with claim 26 wherein said at least one end panel plow assembly comprises:a frame that is rotatable with respect to the plunger opening;an end panel plow coupled to said frame, said end panel plow configured to rotate the first end panel toward the interior surface of the bottom panel by contacting the exterior surface of the first end panel;a pair of glue plates coupled to said frame, wherein said end panel plow is positioned between said glue plates;and a pair of glue rollers, each glue roller coupled adjacent a top end of a respective glue plate of said pair of glue plates, a first glue plate and a first glue roller configured to press an interior surface of the first end panel into contact with the reinforcing end tab to form the container.
  28. 28
    A machine in accordance with claim 26, wherein the blank includes at least one outer reinforcing comer panel extending from a first side edge of a first end panel of the two end panels and the reinforcing panel assembly includes a comer panel -72CA 2938554 2017-03-13 extending from the first side edge of the first side panel, said machine further comprising at least one comer pusher positioned between a first side panel plow of said pair of side panel plows and said at least one end panel plow assembly, said comer pusher configured to move toward the plunger opening to force the at least one outer reinforcing comer panel into contact with an exterior surface of the comer panel to form the container.
  29. 29
    A machine in accordance with any one of claims 19 to 28 wherein said hopper station comprises:a hopper configured to support the blank substantially horizontally with the exterior surface of the blank facing downward;a feed mechanism configured to pull the blank downward through said hopper station to remove the blank from said hopper;at least one stationary plow configured to fold the reinforcing panel assembly with respect to the first side panel;and at least one moving plow configured to fold a second reinforcing panel assembly with respect to a second side panel of the two side panels, said at least one moving plow configured to move toward and away from said at least one stationary plow.
  30. 30
    A machine in accordance with claim 29 wherein said feed mechanism comprises:at least one suction cup;at least one support bar configured to contact the exterior surface of the bottom panel;a vertical actuator configured to move said at least one suction cup and said at least one support bar toward and away from said hopper;and a horizontal actuator configured to move said at least one suction cup and said at least one support toward and away from said comer post forming station.
  31. 31
    A machine in accordance with any one of claims 19 to 30 further comprising a first adhesive applicator positioned between said hopper station and said comer post forming station, said first adhesive applicator configured to apply adhesive to an interior surface of the side panels.
  32. 32
    A machine in accordance with any one of claims 19 to 31 further comprising a second adhesive applicator positioned between said comer post forming station and -73CA 2938554 2017-03-13 said plunger station, said second adhesive applicator configured to apply adhesive to at least an exterior surface of an outer reinforcing panel of the reinforcing panel assembly.
  33. 33
    A machine in accordance with any one of claims 19 to 32 further comprising an ejection station comprising an exit conveyor extending at least partially through a bottom end of said plunger station.
Independent claims33