Fluid-filled structure
A fluid-filled chamber may include a pair of polymer layers that define a plurality of subchambers and a web area. The subchambers are protruding portions of the polymer layers that enclose a fluid, and the web area is portions of the polymer layers that are located between the subchambers and lay adjacent to each other. The subchambers may have greater thickness than the web area. A perimeter bond joining the polymer layers and extends around a periphery of the chamber. In addition, a plurality of interior bonds join the polymer layers and extend around the subchambers, which may seal the fluid within the subchambers.
1. A sole structure including a fluid-filled chamber, the fluid-filled chamber comprising: a first polymer sheet; a second polymer sheet attached to the first polymer sheet and cooperating with the first polymer sheet to define molded regions respectively defining a plurality of protrusions; a first bond formed between the first polymer sheet and the second polymer sheet and extending around a periphery of the chamber; and a plurality of second bonds formed between the first polymer sheet and the second polymer sheet to form a web area located between the protrusions, the second bonds completely surrounding each of the protrusions to seal and pressurize a fluid within the protrusions;
wherein the first polymer sheet and the second polymer sheet remain spaced apart from each other in unbonded portions of the web area between the protrusions, the unbonded portions having a different shape than the protrusions;
wherein a thickness of the chamber in the web area is less than a thickness of the chamber at the protrusions; and
wherein the plurality of protrusions include a first series of protrusions located along a medial side of the chamber, a second series of protrusions located along a lateral side of the chamber, and a third series of protrusions located between the first series of protrusions and the second series of protrusions and being smaller than the first series of protrusions and the second series of protrusions, the unbonded portions being disposed between the first series of protrusions and the third series of protrusions and being disposed between the second series of protrusions and the third series of protrusions and including a substantially uniform size and shape at each location of the unbonded portions.
2. The sole structure of claim 1 , wherein the fluid is pressurized.
3. The sole structure of claim 2 , wherein the protrusions are operable to receive the fluid after formation of the first bond and before formation of the second bonds.
4. The sole structure of claim 1 , wherein the protrusions are operable to receive the fluid after formation of the first bond and before formation of the second bonds.
5. The sole structure of claim 1 , wherein the plurality of protrusions include a substantially spherical shape.
6. The sole structure of claim 1 , wherein the fluid within the protrusions defines a fixed volume.
7. An article of footwear comprising:
a sole structure including a fluid-filled chamber, the fluid-filled chamber comprising:
a first polymer sheet; a second polymer sheet attached to the first polymer sheet and cooperating with the first polymer sheet to define molded regions respectively defining a plurality of protrusions; a first bond formed between the first polymer sheet and the second polymer sheet and extending around a periphery of the chamber; and
a plurality of second bonds formed between the first polymer sheet and the second polymer sheet to form a web area located between the protrusions, the second bonds completely surrounding each of the protrusions to seal and pressurize a fluid within the protrusions; wherein the first polymer sheet and the second polymer sheet remain spaced apart from each other in unbonded portions of the web area between the protrusions, the unbonded portions having a different shape than the protrusions;
wherein a thickness of the chamber in the web area is less than a thickness of the chamber at the protrusions; and
wherein the plurality of protrusions include a first series of protrusions located along a medial side of the chamber, a second series of protrusions located along a lateral side of the chamber, and a third series of protrusions located between the first series of protrusions and the second series of protrusions and being smaller than the first series of protrusions and the second series of protrusions, the unbonded portions being disposed between the first series of protrusions and the third series of protrusions and being disposed between the second series of protrusions and the third series of protrusions and including a substantially uniform size and shape at each location of the unbonded portions.
8. The article of footwear of claim 7 , wherein the fluid is pressurized.
9. The article of footwear of claim 8 , wherein the protrusions are operable to receive the fluid after formation of the first bond and before formation of the second bonds.
10. The article of footwear of claim 7 , wherein the protrusions are operable to receive the fluid after formation of the first bond and before formation of the second bonds.
11. The article of footwear of claim 7 , wherein the plurality of protrusions include a substantially spherical shape.
12. The article of footwear of claim 7 , wherein the fluid within the protrusions defines a fixed volume.