Foamed sole components and method for making a sole with foamed sole components
A sole structure for articles of footwear and a method of manufacturing them comprising at least one polymeric foamed component expanded through supercritical fluid (SCF) expansion of a shaped pre-expanded polymeric material. The polymeric foamed component may include apertures situated and fashioned in the formation of the pre-expanded polymeric material to promote uniform expansion and optimal curing conditions during the SCF expansion process. At least one polymeric foamed component having one set of physical properties that may be bound to or assembled in conjunction with one or more sole components having the same or another set of physical properties.
1 . A sole for footwear comprising:
a. a foam constructed from a polymer material comprising EVA wherein the polymer material is expanded by supercritical fluid (SCF) to form the foam;
b. the foam comprising a first surface and a second surface wherein the first surface is opposite of the second surface; and
c. the foam having a plurality of holes or cavities introduced into the first surface of the polymer material prior to supercritical fluid expansion, wherein a relative proportion of the plurality of holes or cavities increases with a thickness of the polymer material.
2 . The sole of claim 1 wherein the plurality of holes or cavities are in a first portion of the polymer material wherein the first portion of the polymer material has a greater thickness between the first surface and the second surface than a second portion of the polymer material, and the second portion is devoid of any apertures introduced into the first surface.
3 . The sole of claim 2 wherein the plurality of holes or cavities partially extend between the first surface and the second surface.
4 . The sole of claim 2 wherein the plurality of holes or cavities have openings with an area between 3 mm 2 to 7 mm 2 .
5 . The sole of claim 1 wherein the foam comprises average cell size diameters ranges from at least 600 to 1400 microns.
6 . The sole of claim 1 , wherein the polymer material further comprises rubber, and the EVA content ranges from 40 to 60 parts per hundred rubber (phr).
7 . The sole of claim 1 , further comprising:
at least one skeleton matrix composed of support walls within the foam.
8 . The sole of claim 1 , further comprising:
at least one fluid-filled bladder within the foam.
9 . The sold of claim 1 , wherein the plurality of holes or cavities comprise cylindrical upper portions and hexagonal prism lower portions.
10 . A sole for footwear comprising:
a. a foam constructed from a polymer material comprising ethylene vinyl acetate (EVA) wherein the polymer material is expanded by a supercritical fluid (SCF) to form the foam;
b. the foam comprising a first surface and a second surface wherein the first surface is opposite of the second surface;
c. the foam comprising a plurality of holes or cavities introduced into the first surface prior to the expansion by the SCF, wherein a relative proportion of the plurality of holes or cavities increases with a thickness of the polymer material; and
d. the foam having density range of 0.14 to 0.16 g/cm 3 and resiliency range of 60-66% (ASTM D-2632).
11 . The sole of claim 10 wherein the foam comprises average cell size diameters ranges from at least 600 to 1400 microns.
12 . The sole of claim 10 wherein at least a portion of the foam having the least one hole or cavity is translucent.
13 . The sole of claim 10 wherein the sole comprises a composite structure with the foam being an SCF-expanded polymer material and another portion of the sole comprising an opaque material.
14 . The sole of claim 13 wherein the opaque material is visualized through the SCF-expanded polymer material.
15 . The sole of claim 14 wherein the opaque material comprises a carbon fiber material.
16 . A sole for footwear comprising:
a. a foam constructed from a polymer material wherein the polymer material is expanded by supercritical fluid (SCF) to form the foam;
b. the foam comprising a first surface and a second surface wherein the first surface is opposite of the second surface;
c. the foam having a plurality of holes or cavities introduced into the first surface of the polymer material prior to supercritical fluid expansion, wherein a relative proportion of the plurality of holes or cavities increases with a thickness of the polymer material;
d. wherein the plurality of holes or cavities have an opening with an area between 3 mm 2 to 7 mm 2 ; and
e. wherein at least a portion of the foam having the least one hole or cavity is translucent.
17 . The sole of claim 16 wherein the polymer material comprises ethylene vinyl acetate (EVA).
18 . The sole of claim 17 wherein the foam comprises average cell size diameters ranges from at least 600 to 1400 microns.
19 . The sole of claim 16 wherein the sole comprises a composite structure with the foam being an SCF-expanded polymer material and another portion of the sole comprising an opaque material.
20 . The sole of claim 19 where in the opaque material is visualized through the SCF-expanded polymer material.
21 . The sole of claim 19 where in the opaque material comprises a carbon fiber material.
22 . The sole of claim 19 wherein the polymer material comprises ethylene vinyl acetate (EVA).
23 . The sole claim 22 where a carbon fiber material is visualized through portions of an SCF-expanded polymer material comprising EVA.
24 . The sole of claim 16 wherein the polymer material comprises EVA, the foam has a plurality of holes or cavities, each hole or cavity is spaced away from another hole or cavity by at least 3 mm prior to supercritical fluid expansion, each aperture has an opening with an area between 3 mm 2 to 7 mm 2 , the foam has average cell size diameters ranging from at least 600 to 1400 microns, and the polymer material has a density range of 0.14 to 0.16 g/cm 3 and a resiliency range of 60-66%.