Bottom seal for container
The present invention generally provides a bottom seal for a container. The container has a side wall having an upper end and a lower end. A bottom wall closes the lower end of the side wall. The bottom wall has a base and a skirt projecting from an outer periphery of the base. A bottom seal made of a portion of the lower end of the side wall being folded generally radially inward and back on itself forms a first seal region and an adjacent second seal region. The first seal region includes the skirt and the lower end of the side wall. The second seal region does not include the skirt. One or more concentric ring seals, knurling patterns, or both are formed in at least one of the first and second seal regions of the bottom seal.
1. A container comprising:
a side wall having an upper end and a lower end;
a rim at the upper end of the side wall;
a bottom wall that closes the lower end of the side wall to form a cavity therebetween, the bottom wall having a base and a skirt projecting from an outer periphery of the base;
an outer portion of the lower end of the side wall that transitions at a crease into an inner portion of the lower end of the side wall, the outer and inner portions abutting opposite surfaces of the skirt, wherein a lowermost edge of the skirt is positioned a distance from the crease;
a primary seal formed between the outer and inner portions of the lower end of the side wall;
a secondary seal formed between the skirt and the outer and inner portions of the side wall, wherein the secondary seal connects the bottom wall to the side wall, and wherein the secondary seal is formed of a three-dimensional component, wherein the three-dimensional component in the secondary seal comprises a first circumferential ring provided in a plane substantially parallel to the base; and
a second circumferential ring in an innermost region of the primary seal, the second circumferential ring being in a plane substantially parallel to the base.
2. The container of claim 1 , wherein the base is generally disk-shaped.
3. The container of claim 1 further comprising:
a third circumferential ring in the innermost region of the secondary seal, the second circumferential ring being in a plane substantially parallel to the base.
4. The container of claim 1 , wherein the first circumferential ring forms an indentation in the secondary seal.
5. The container of claim 1 , wherein the three-dimensional component comprises a knurled seal.
6. The container of claim 1 , wherein the lowermost edge of the skirt is located at least 1 millimeter above the crease.
7. The container of claim 1 , wherein the lowermost edge of the skirt is located at least 2 millimeters above the crease.
8. The container of claim 1 , wherein the lowermost edge of the skirt is located at least 3 millimeters above the crease.
9. The container of claim 1 , wherein the side wall is generally conical.
10. The container of claim 1 , wherein the container is made of a paper-based material.