Article of footwear with first and second outsole components and method of manufacturing an article of footwear
A sole structure for an article of footwear comprises a midsole including a polymeric bladder element enclosing a fluid-filled interior cavity, a first outsole component secured to a bottom surface and to a side surface of the polymeric bladder element, and a second outsole component. The first outsole component includes a first base, and a wall integral with the first base. The second outsole component includes a second base secured to the first base, and a wall integral with the second base and secured to the outer surface of the wall of the first outsole component. A method of manufacturing the article of footwear includes thermoforming the bladder element and the first outsole component, and securing the second outsole component to the first outsole component.
1. A method of manufacturing an article of footwear comprising:
placing a preformed first outsole component in a thermoforming mold; wherein the preformed first outsole component has:
a base with integral tread elements protruding from a first portion of a bottom surface of the base, and with a second portion of the bottom surface free of any tread elements; and
an outer wall integral with the base and adjacent the second portion of the bottom surface and an inner wall integral with the base;
placing a first polymeric sheet and a second polymeric sheet in the thermoforming mold with the first outsole component;
closing the thermoforming mold to enclose the first polymeric sheet, the second polymeric sheet, and the first outsole component in a mold cavity;
applying a vacuum to conform the first polymeric sheet to a first mold surface of the thermoforming mold and to conform the second polymeric sheet to an upper surface of the first outsole component and to a second mold surface of the thermoforming mold, thereby defining an interior cavity between the first polymeric sheet and the second polymeric sheet;
thermally bonding the first polymeric sheet to the second polymeric sheet to enclose the interior cavity;
thermally bonding a lower surface of the second polymer sheet to the upper surface of the first outsole component;
removing the first polymer sheet, the second polymer sheet, and the first outsole component from the thermoforming mold as a unit;
positioning a second outsole component on the second portion of the bottom surface of the base; and
adhering the second outsole component to the first outsole component so that the second outsole component extends along the bottom surface of the base, partway up the outer wall, and partway up the inner wall.
2. The method of claim 1 , wherein removing the first polymeric sheet, the second polymeric sheet, and the first outsole component from the thermoforming mold as a unit is performed after a predetermined cooling period.
3. The method of claim 1 , wherein:
the first outsole component has a recess; and
said positioning the second outsole component is performed by nesting the second outsole component in the recess.
4. The method of claim 3 , wherein said nesting includes placing an upper edge of the second outsole component along a lip of the first outsole component at an upper extent of the recess.
5. The method of claim 4 , wherein:
the recess extends along the bottom surface of the base, partway up the outer wall, and further up the inner wall than the outer wall.
6. The method of claim 1 , wherein, after adhering the second outsole component to the first outsole component, the first polymeric sheet, the second polymeric sheet, the first outsole component, and the second outsole component are configured as a forefoot sole structure, the method further comprising:
securing the forefoot sole structure to a forefoot region of a footwear upper; and
securing a heel sole structure to a heel region of the footwear upper with a forward edge of the heel sole structure adjacent a rearward edge of the forefoot sole structure.
7. The method of claim 1 , further comprising:
securing a footwear upper to an upper surface of the first polymeric sheet.
8. The method of claim 1 , wherein:
the second mold surface has a positioning marker; and
placing the first outsole component in the thermoforming mold includes placing a predetermined portion of the first outsole component at the positioning marker, thereby orienting the first outsole component in a predetermined position in the thermoforming mold.
9. The method of claim 1 , wherein the second outsole component and the integral tread elements of the first outsole component together establish a ground-engaging surface of the article of footwear.
10. A method of manufacturing an article of footwear comprising:
placing a preformed first outsole component in a thermoforming mold; wherein the preformed first outsole component has:
a base with integral tread elements protruding from a first portion of a bottom surface of the base, and with a second portion of the bottom surface free of any tread elements; and
a wall integral with the base and adjacent the second portion of the bottom surface; wherein the first outsole component has a recess in an outer surface of the wall;
placing a first polymeric sheet and a second polymeric sheet in the thermoforming mold with the first outsole component;
closing the thermoforming mold to enclose the first polymeric sheet, the second polymeric sheet, and the first outsole component in a mold cavity;
applying a vacuum to conform the first polymeric sheet to a first mold surface of the thermoforming mold and to conform the second polymeric sheet to an upper surface of the first outsole component and to a second mold surface of the thermoforming mold, with an interior cavity between the first polymeric sheet and the second polymeric sheet;
thermally bonding the first polymeric sheet to the second polymeric sheet to enclose the interior cavity;
thermally bonding a lower surface of the second polymer sheet to the upper surface of the first outsole component;
removing the first polymeric sheet, the second polymeric sheet, and first outsole component from the thermoforming mold as a unit after a predetermined cooling period;
positioning a second outsole component on the second portion of the bottom surface of the base by nesting the second outsole component in the recess;
wherein said nesting includes placing an upper edge of the second outsole component along a lip of the first outsole component at an upper extent of the recess; and
adhering the second outsole component to the first outsole component; wherein the wall is an outer wall, the first outsole component includes an inner wall integral with the base, and the recess extends along the bottom surface of the base, partway up the outer wall, and further up the inner wall than the outer wall.
11. The method of claim 10 , wherein, after adhering the second outsole component to the first outsole component, the first polymeric sheet, the second polymeric sheet, the first outsole component, and the second outsole component are configured as a forefoot sole structure, the method further comprising:
securing the forefoot sole structure to a forefoot region of a footwear upper; and
securing a heel sole structure to a heel region of the footwear upper with a forward edge of the heel sole structure adjacent a rearward edge of the forefoot sole structure.
12. The method of claim 10 , further comprising:
securing a footwear upper to an upper surface of the first polymeric sheet.
13. The method of claim 10 , wherein the second mold surface has a positioning marker; and
placing the first outsole component in the thermoforming mold includes placing a predetermined portion of the first outsole component at the positioning marker, thereby orienting the first outsole component in a predetermined position in the thermoforming mold.