Plastic corrugated container with soft score line

Patent metadata

Field	Value
Publication number	US-10625916-B2
Application number	US-201715629806-A
Country	US
Kind code	B2
Filing date	Jun 22, 2017
Priority date	Dec 24, 2013
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A box formed from a plastic corrugated material with soft score lines is provided. The soft score lines are formed to enable the top flaps of the box to lay substantially flat against the outer surface of the box when folded to an open position.

First claim

I claim:

1. A corrugated plastic box with a soft score line comprising:
a plurality of side walls, each of the side walls formed from a corrugated plastic sheet of material;
a first top flap extending upward from a first one of the plurality of side walls, the first top flap formed from the corrugated plastic sheet of material and separated from the first one of the plurality of side walls by a single first score line without a slit wherein the first score line is configured to allow the first flap to lay flat against an outer surface of the first one of the plurality of side walls without spring back when the first flap is folded against the outer surface of the first one of the plurality of side walls.

2. The corrugated plastic box of claim 1 wherein the corrugated plastic sheets of material includes a first outer layer of plastic, a second outer layer of plastic and a plurality of flutes between the first outer layer and the second outer layer.

3. The corrugated plastic box of claim 1 wherein the first score line is formed to have an inwardly concave radius of 0.01 inches.

4. The corrugated plastic box of claim 1 further comprising:
a second top flap extending from a second one of the plurality of side walls, the second top flap formed from the corrugated plastic sheet of material and separated from the second one of the plurality of side walls by a second single score line without a slit wherein the second score line is configured to allow the second flap to lay flat against an outer surface of the second one of the plurality of side walls without spring back when the second flap is folded against the outer surface of the second one of the plurality of side walls.

5. The corrugated plastic box of claim 4 further comprising:
a third top flap extending from a third one of the plurality of side walls, the third flap formed from the corrugated plastic sheet of material and separated from the third one of the plurality of side walls by a third single score line without a slit wherein the third score line is configured to allow the third flap to lay flat against an outer surface of the third one of the plurality of side walls without spring back when the third flap is folded against the outer surface of the third one of the plurality of side walls.

6. The corrugated plastic box of claim 5 further comprising:
a fourth top flap extending from a fourth one of the plurality of side walls, the fourth flap formed from the corrugated plastic sheet of material and separated from the fourth one of the plurality of side walls by a single fourth score line without a slit wherein the fourth score line is configured to allow the fourth flap to lay flat against an outer surface of the fourth one of the plurality of side walls without spring back when the fourth flap is folded against the outer surface of the fourth one of the plurality of side walls.

7. The corrugated plastic box of claim 6 wherein each of the first, second, third and fourth flaps-form a top of the box.

8. The corrugated plastic box of claim 7 further including a plurality of bottom flaps, each of the plurality of flaps connected to one of the plurality of side walls to form a bottom wall of the box.

9. A method of forming a plastic box with a soft score line comprising:
providing a blank of corrugated plastic material, the blank formed to include a plurality of side walls and a top first flap extending from a first one of the plurality of side walls;
forming a single score line without a slit between the first top flap and the first one of the plurality of side walls sufficiently wide such that the first top flap is configured to lay flat against an outer surface of the first one of the plurality of side walls without spring back when the first top flap is folded against the outer surface of the first one of the plurality of side walls.

10. The method of forming a plastic box of claim 9 wherein the forming a score line step comprises applying a rotary ultrasonic horn against the blank.

11. The method of forming a plastic box of claim 9 wherein the forming a score line step comprises applying a plunge ultrasonic horn against the blank.

12. The method of forming a plastic box of claim 9 wherein the forming a score line step comprises applying heat and pressure to the blank.

13. The method of forming a plastic box of claim 10 wherein the ultrasonic horn includes a contact segment having a radius of 0.01 inches.

14. The method of forming a plastic box of claim 9 wherein the blank includes a second top flap extending from a second one of the plurality of side walls, and the method further comprises:
forming a single score line without a slit between the second top flap and the second one of the plurality of side walls sufficiently wide such that the second top flap is configured to lay flat against an outer surface of the second one of the plurality of side walls without spring back when the second top flap is folded against the outer surface of the second one of the plurality of side walls.

15. The method of forming a plastic box of claim 14 wherein the blank includes a third top flap extending from a third one of the plurality of side walls, and the method further comprises:
forming a single score line without a slit between the third top flap and the third one of the plurality of side walls sufficiently wide such that the third top flap is configured to lay flat against an outer surface of the third one of the plurality of side walls without spring back when the third top flap is folded against the outer surface of the third one of the plurality of side walls.

16. The method of forming a plastic box of claim 15 wherein the blank includes a fourth top flap extending from a fourth one of the plurality of side walls, and the method further comprises:
forming a single score line without a slit between the fourth top flap and the fourth one of the plurality of side walls sufficiently wide such that the fourth top flap is configured to lay flat against an outer surface of the fourth one of the plurality of side walls without spring back when the fourth top flap is folded against the outer surface of the fourth one of the plurality of side walls.

17. The method of claim 16 wherein the step of providing a blank of corrugated plastic material comprises:
extruding a sheet of plastic having a first outer layer, a second outer layer and a plurality of flutes between the first outer layer and the second outer layer.

18. The method of claim 17 wherein the step of providing a blank of corrugated plastic material comprises:
forming fold lines on the sheet to form the plurality of side walls; and,
cutting the sheet to form flaps extending from each of the plurality of side walls.

19. The method of claim 18 further comprising the step of forming the blank into a box shape.

Assignees

• Orbis Corp

Inventors

• Balazs Donald J

Classifications

• B31F1/10

  by rotary tools · CPC title

• B31B2110/35

  rectangular, e.g. square · CPC title

• B31B50/256 Primary

  using tools mounted on a drum · CPC title

• B31B2105/0022

  Making boxes from tubular webs or blanks, e.g. with separate bottoms, including tube or bottom forming operations · CPC title

• B31B2100/0022

  made from tubular webs or blanks, including by tube or bottom forming operations · CPC title