Footwear upper comprising stretch zones
An upper of an article of footwear comprises a plurality of stretch zones each having a respective stretching capability. Suitable example stretch zones may include four-way stretch zones, two-way stretch zones, and/or lock-out zones. In some examples, an upper having a plurality of stretch zones comprises a single continuous piece of material configured to have regions of different stretching capability. The single piece of material may comprise a layered material having two stretchable outer layers, wherein a plurality of stretch zones of the piece of material are defined by corresponding intermediate layers disposed at selected locations between the outer layers. Examples of intermediate layers providing two-way stretch, four-way stretch, and little or no stretch are disclosed.
1. A method of manufacturing an upper for an article of footwear, the method comprising:
sandwiching a patterned intermediate layer between two continuous outer layers; and
forming a single continuous sheet including a plurality of stretch zones, each stretch zone defined by a selected directional elasticity, by coupling the patterned intermediate layer to the two continuous outer layers, such that at least two stretch zones of the plurality of stretch zones are sandwiched by the two continuous outer layers;
wherein the patterned intermediate layer is disposed between the two continuous outer layers in the at least two stretch zones of the plurality of stretch zones.
2. The method of claim 1 , wherein the patterned intermediate layer has a structure including at least one pattern of openings configured to stretch along one or more predetermined stretch axes, such that the at least one pattern of openings in the patterned intermediate layer determines the directional elasticity of a first stretch zone of the at least two stretch zones.
3. The method of claim 1 , further comprising forming an upper using the single continuous sheet and lasting the upper.
4. The method of claim 3 , further comprising coupling a sole to the upper.
5. The method of claim 3 , wherein forming the upper out of the single continuous sheet includes coupling the single continuous sheet to at least one other piece of material.
6. The method of claim 1 , wherein the patterned intermediate layer comprises a foam.
7. The method of claim 1 , further comprising:
perforating a sheet to form the patterned intermediate layer;
wherein differentiation of the perforations defines the plurality of stretch zones, such that different zones have different stretch capabilities.
8. The method of claim 7 , wherein perforating the sheet comprises creating perforations of different sizes within a single stretch zone.
9. The method of claim 1 , wherein sandwiching the intermediate layer between two continuous outer layers comprises applying a selected pattern of adhesive to inner surfaces of at least one of the continuous outer layers.
10. The method of claim 1 , wherein the continuous outer layers each comprise an elastic material.
11. The method of claim 2 , wherein the patterned intermediate layer of the at least two stretch zones extends to a second stretch zone and includes a second pattern of openings determining a directional elasticity of the second stretch zone, wherein the directional elasticity of the second stretch zone is different than the directional elasticity of the first stretch zone.
12. A method of manufacturing a sheet of material comprising two or more stretch zones, the method comprising:
layering a patterned intermediate layer of material between two continuous outer layers of material; and
adhering the patterned intermediate layer to the two continuous outer layers;
wherein adhering the patterned intermediate layer to the two continuous outer layers forms a single continuous sheet including a first stretch zone and a second stretch zone, the first stretch zone defined by a first directional elasticity and the second stretch zone defined by a second directional elasticity different from the first directional elasticity; and
wherein the patterned intermediate layer is disposed between the two continuous outer layers in the first stretch zone.
13. The method of claim 12 , wherein adhering the patterned intermediate layer to the two continuous outer layers comprises applying an adhesive to inner surfaces of one or both continuous outer layers in an engineered pattern.
14. The method of claim 13 , wherein adhering the patterned intermediate layer to the two continuous outer layers comprises activating the adhesive by heating the layers.
15. The method of claim 12 , wherein the patterned intermediate layer comprises a foam.
16. The method of claim 15 , wherein the patterned intermediate layer has a lattice structure including at least one pattern of openings configured to stretch along one or more predetermined stretch axes, such that the at least one pattern of openings in the patterned intermediate layer determines the directional elasticity of the first stretch zone.
17. The method of claim 16 , wherein the patterned intermediate layer extends to the second stretch zone and includes at least a second pattern of openings determining a directional stretching capability of the second stretch zone, the directional stretching capability of the second stretch zone being different from a directional stretching capability of the first stretch zone.
18. The method of claim 16 , wherein the pattern of openings includes openings of different sizes.
19. The method of claim 12 , wherein each of the two continuous outer layers is configured to stretch along two axes.
20. A method of manufacturing an upper for an article of footwear, the method comprising:
sandwiching a patterned intermediate layer between two continuous outer layers;
coupling the patterned intermediate layer to the two continuous outer layers to form a single continuous sheet including a plurality of stretch zones including a first stretch zone having a first directional elasticity and a second stretch zone having a second directional elasticity different from the first directional elasticity; and
coupling the single continuous sheet to itself at a single seam or to at least one other piece of material;
wherein the patterned intermediate layer is disposed between the two continuous outer layers in the first stretch zone of the plurality of stretch zones;
wherein the patterned intermediate layer has a pattern of openings configured to stretch along one or more predetermined stretch axes, such that the pattern of openings in the patterned intermediate layer determines the first directional elasticity of the first stretch zone.