Sole assembly and related method of manufacture
AssigneeWolverine Outdoors, Inc.
InventorIan M. Cobb
Life of this patent
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Abstract
A method of forming a sole assembly for footwear construction comprises providing a first polymeric composition having a first density and a second polymeric composition having a second density in a mold to form a pre-expanded midsole. The pre-expanded midsole is expanded using a supercritical fluid to form a midsole. The midsole includes an exterior portion having a third density and an interior portion having a fourth density, which is different than the third density. The midsole defines a first surface and a second surface opposite the first surface. An outsole is joined with the second surface of the midsole.
Claims9
A method of forming a sole assembly for a footwear construction, the method comprising:
- providing in a mold a first polymeric composition having a first density and a second polymeric composition having a second density to form a pre-expanded midsole;
- expanding the pre-expanded midsole using a supercritical fluid to form a midsole, the midsole defining a first surface and a second surface opposite the first surface and including an exterior portion having a third density and an interior portion having a fourth density different than the third density;
- and
- joining an outsole with the second surface of the midsole,
- wherein the first polymeric composition comprises ethylene vinyl acetate and titanium dioxide,
- wherein the second polymeric composition comprises ethylene vinyl acetate and a colorant.
Dependencies are inferred from the claim text.