Plastic coffee container with top load support by particulate product

1. A rigid container for a particulate product with enhanced top load support, comprising:

an interior volume formed by a base, a surrounding wall member upstanding from said base, and a top; and

a particulate product provided in said interior volume, said particulate product provided in sufficient quantity to fill said interior volume up to where a predetermined minimum headspace is provided such that said particulate product provides a significant resistance force to compression of the surrounding wall member when a top load on the container is present, the predetermined minimum headspace being that which produces a top load ratio of at least 3:1, where the top load ratio is defined as a ratio of the top load force sufficient to cause a 0.30″ deflection in the rigid container when filled to the predetermined minimum headspace and when said particulate product is providing a resistance force to compression over the top load force sufficient to cause a 0.30″ deflection in the rigid container when empty.

2. A rigid container as claimed in claim 1 , and further including an enlarged top opening in said top and a flexible closure attached to said top and spanning said top opening, wherein said predetermined minimum headspace is also sufficient so that about 20% of said flexible closure contacts a top portion of said particulate product when a pressure of said interior volume is 3 psi less than ambient and causes said flexible closure to flex inward.

3. A rigid container as claimed in claim 1 , wherein a top half of said surrounding wall member has a wall thickness which is greater than a wall thickness of a bottom half.

4. A rigid container as claimed in claim 1 , wherein a wall thickness of said surrounding wall member changes gradually over a height thereof from adjacent said top to adjacent said base.

5. A rigid container as claimed in claim 1 , wherein a portion of said surrounding wall member is generally curved in cross section.

6. A rigid container as claimed in claim 1 , wherein said surrounding wall member is rectangular in cross section.

7. A rigid container as claimed in claim 1 , wherein the particulate product is compacted coffee.

8. A rigid container as claimed in claim 1 , wherein said base, said surrounding wall member and said top are made of a plastic material.

9. A rigid container as claimed in claim 8 , further including a flexible closure attached to said top and spanning said top opening, and a one-way valve provided in said flexible closure.

10. A rigid container as claimed in claim 9 , wherein said interior volume has a volume of at least one liter.

11. A method for reinforcing a rigid container for a particulate product against top load forces comprising the steps of:

forming a rigid container with a container interior volume formed by a base, a surrounding wall member which is upstanding from the base, and a top which connects with the surrounding wall member and which includes an opening therein; and

filling the interior volume with a particulate product so that at least a predetermined minimum headspace is provided such that said particulate product provides a significant resistance force to compression of the surrounding wall member when a top load on the container is present, the predetermined minimum headspace being that which produces a top load ratio of at least 3:1, where the top load ratio is defined as a ratio of the top load force sufficient to cause a 0.30″ deflection in the plastic container when filled to the predetermined minimum headspace and when said particulate product is providing a resistive force to compression over the top load force sufficient to cause a 0.30″ deflection in the plastic container when empty.

12. A method for reinforcing a rigid container as claimed in claim 11 , and further including, after said filling step, the step of attaching a flexible closure to said top and spanning the top opening, wherein the predetermined minimum headspace is also sufficient so that about 20% of the flexible closure contacts a top portion of the particulate product when a pressure of the interior volume is 3 psi less than ambient and this pressure causes the flexible closure to flex inward.

13. A method for reinforcing a rigid container as claimed in claim 11 , wherein the particulate product is coffee, and wherein said filling step includes the step of vibrating the particulate coffee.

14. A method for reinforcing a rigid container as claimed in claim 13 , wherein said forming step forms the rigid container of a plastic material, and wherein said filling step fills the container with at least one liter of the particulate coffee.

15. A method for reinforcing a rigid container as claimed in claim 11 , wherein said filling step includes the steps of providing a one-way valve in a flexible closure and attaching the flexible closure to the top and spanning the top opening.

16. A method for reinforcing a rigid container as claimed in claim 11 , wherein said forming step includes creating a wall thickness of the surrounding wall member which is greater adjacent a top half than a bottom half.

17. A method for reinforcing a rigid container as claimed in claim 11 , wherein said creating step causes a wall thickness of the surrounding wall member over a height thereof to change gradually from adjacent the top to adjacent the base.

18. A method for reinforcing a rigid container as claimed in claim 11 , wherein a portion of the surrounding wall member is generally curved in cross section.

19. A method for reinforcing a rigid container as claimed in claim 11 , wherein the surrounding wall member is rectangular in cross section.

20. A rigid container for a particulate coffee with enhanced top load support, comprising:

an interior volume holding at least one liter and formed by a base, a surrounding wall member upstanding from said base, a top with an enlarged opening sufficient for a five inch cylinder to fit therethrough, a flexible closure attached to said top and spanning said top opening, and a one-way valve provided in said flexible closure;

wherein said base, said surrounding wall member and said top are formed of a plastic material, and said surrounding wall member has a wall thickness which is greater adjacent said top than adjacent said base; and

a particulate compacted coffee provided in said interior volume, said particulate compacted coffee provided in sufficient quantity to fill said interior volume up to a level where a predetermined minimum headspace is provided such that said particulate product provides a significant resistance force to compression of the surrounding wall member when a top load on the container is present, the predetermined minimum headspace being that which produces a top load ratio of at least 3:1, where the top load ratio is defined as a ratio of the top load force sufficient to cause a 0.30″ deflection in the plastic container when filled to the predetermined minimum headspace and when said particulate product is providing a resistive force to compression over the top load force sufficient to cause a 0.30″ deflection in the plastic container when empty; and

wherein said predetermined minimum headspace is also sufficient so that about 20% of said flexible closure contacts a top portion of said particulate product when a pressure of said interior volume is 3 psi less than ambient and causes said flexible closure to flex inward.