Paper wrapped foam cup and method of assembly
A commercially viable paper wrapped foam cup comprising a taper portion that prevents the shrinkage-induced curling from interfering with the un-nesting of nested paper wrapped foam cups. The paper wrapped cup further comprises a fillet for strengthening the cup foot to retard shrinkage-induced curling of the foot. The paper wrapper has abutting to overlapping opposing ends to completely hide the foam cup to enhance the visual appearance of the cup. The overlapping portions of the paper wrapper are not bonded to each other to prevent wrinkling of the paper wrapper as the cup shrinks. A machine and corresponding method provide for automatically supplying foam cups and paper wrappers, wrapping the paper wrapped cup, and stacking the wrapped cups.
1. A wrapped foam cup comprising:
an expanded foam cup comprising a bottom wall and a peripheral wall extending away from the bottom wall, the bottom wall having an upper surface and a lower surface, the peripheral wall having an inner surface and an outer surface, the upper surface and the inner surface defining a beverage cavity, and the peripheral wall terminating in a lip that defines an opening to the beverage cavity;
a wrapper wrapped around and bonded to the outer surface of the cup, the wrapper having opposing ends connected by an upper edge and a lower edge, with the upper edge of the wrapper near the lip of the cup;
a shoulder located along the inner surface of the peripheral wall for supporting a similar wrapped foam cup in a nested relationship with the wrapped foam cup;
wherein the peripheral wall has a first portion, above the shoulder, with a first outward taper and a second portion, above the first portion, with a second outward taper, the second portion extending at least up to the lip of the cup, and the upper edge of the wrapper lies on the second portion of the peripheral wall; and
wherein the second outward taper is greater than the first outward taper.
2. The wrapped foam cup according to claim 1 , wherein the second portion has a thickness less than the first portion.
3. The wrapped foam cup according to claim 2 , wherein the second portion has a continuously reducing thickness in a direction toward the upper edge of the peripheral wall.
4. The wrapped foam cup according to claim 1 , wherein the second outward taper is variable.
5. The wrapped foam cup according to claim 4 , wherein the first outward taper is constant.
6. The wrapped form cup according to claim 5 , wherein the first outward taper extends along the entire length of the first portion of the peripheral wall.
7. A pair of wrapped foam cups, each cup comprising:
a bottom wall and a peripheral wall extending away from the bottom wall, the bottom wall having an upper surface and a lower surface, the peripheral wall having an inner surface and an outer surface, the upper surface and the inner surface defining a beverage cavity, and the peripheral wall terminating in a lip that defines an opening to the beverage cavity;
a wrapper wrapped around and bonded to the outer surface of the cup, the wrapper having opposing ends connected by an upper edge and a lower edge, with the upper edge of the wrapper near the lip of the cup;
a shoulder located along the inner surface of the peripheral wall for supporting one of the pair of wrapped foam cups in a nested relationship with the other of the pair of wrapped foam cup;
wherein the peripheral wall has a first portion, above the shoulder, with a first outward taper and a second portion, above the first portion, with a second outward taper, the second portion extending at least up to the lip of the cup, and the upper edge of the wrapper lies on the second portion of the peripheral wall; and
wherein the second outward taper is greater than the first outward taper.
8. The wrapped foam cup of claim 7 , wherein the shoulder is located along the inner surface of the peripheral wall such that an air gap is formed between the peripheral walls of a pair of nested wrapped foam cups.
9. The wrapped foam cup according to claim 8 , wherein the second outward taper is such that the lip of the foam cup does not extend into the cavity beyond the air gap upon the shrinkage of the wrapped foam cup.
10. The wrapped foam cup according to claim 1 , wherein portions of the opposing ends are in an overlapping relationship.
11. The wrapped foam cup according to claim 10 , wherein the portions of the opposing ends are not bonded together.
12. The wrapped foam cup according to claim 1 , wherein the cup further comprises a foot extending downwardly from the bottom wall and the lower edge of the wrapper overlies a portion of the foot.
13. The wrapped foam cup according to claim 12 , wherein the cup further comprises a fillet extending between the foot and the lower surface of the bottom wall.
14. The wrapped foam cup according to claim 1 , wherein the wrapper is made from paper.
15. The wrapped foam cup according to claim 14 , wherein the paper is coated and the coating contains suitable bonding materials for adhering the paper to the foam cup.
16. The wrapped foam cup according to claim 1 , wherein the lip is part of a top edge of the cup for mounting a lid.
17. The wrapped foam cup according to claim 16 , wherein the upper edge of the wrapper abuts the lip.
18. The wrapped foam cup of claim 16 wherein the upper edge of the paper wrapper lies 0.030 inches or less from the lip.
19. The wrapped foam cup of claim 7 wherein the second outward taper is greater relative to vertical than the first outward taper by an amount such that any curling attributable to the shrinkage of the portion of the foam cup, above the upper edge of the wrapper, is not greater than an air gap formed between second portions of a pair of nested wrapped foam cups.