Footwear upper including variable stitch density
An article of footwear includes a sole and an upper at least partially formed of a textile element. The textile element includes a yarn matrix having a plurality of interlocked strands oriented in predetermined directions. A structural element may be captured within the matrix at selected locations. In operation, the matrix is stitched onto a temporary substrate. The substrate is removed and the article coupled to a sole structure to form the article of footwear.
1. An upper for an article of footwear, the upper comprising:
a textile structure including a plurality of yarn rows, each yarn row of the plurality of yarn rows including a first strand aligned with a second strand, the first and second strands being interlocked via stitches disposed at selected locations along a length of the yarn row, wherein:
the strands of the plurality of yarn rows are not secured to a substrate;
the stitches of the plurality of yarn rows define a stitch density within the upper, the stitch density being the number of stitches present within a selected area of the upper;
a first selected area of the upper possesses a first stitch density;
a second selected area of the upper possesses a second stitch density; and
the first stitch density is greater than the second stitch density.
2. The upper according to claim 1 , wherein:
each distance between adjacent stitches along the yarn row is 5 mm or less; and
the first strand and the second strand possess a property, and the property of the first strand differs from the property of the second strand.
3. The upper according to claim 1 , further comprising a third area of the upper, the third area possessing a third stitch density, wherein the second stitch density is greater than the third stitch density.
4. The upper according to claim 1 , wherein, in the first stitch density area, the stitches are present every 0.20 mm to 1.50 mm.
5. The upper according to claim 1 , wherein in the second stitch density area, the stitches are present every 1.60 mm to 3.50 mm.
6. The upper according to claim 1 , wherein:
the upper comprises a body defining a perimeter including sole perimeter and an eyelet perimeter; and
the sole perimeter possesses the first stitch density.
7. The upper according to claim 6 , wherein:
the eyelet perimeter further possesses the first stitch density; and
an area between the sole perimeter and the eyelet perimeter possesses the second stitch density.
8. The upper according to claim 7 , wherein:
the body of the upper includes a lateral body side, a medial body side and a tongue opening between the lateral body side and the medial body side; and
a tongue is coupled to the body of the upper such that the tongue is positioned within the tongue opening,
wherein the tongue comprises a textile structure including a plurality of intersecting yarn rows, each yarn row of the plurality of yarn rows including a first strand aligned with a second strand, the first and second strands being interlocked via stitches disposed at selected locations along a length of the yarn row.
9. The upper according to claim 1 , wherein the stitches interlocking the first strand and the second strand are configured as a running stitch or a satin stitch.
10. The upper according to claim 1 , wherein each of the first strand and the second strand comprises nylon.
11. An upper for an article of footwear, the upper comprising:
a textile structure including a plurality of yarn rows, each yarn row of the plurality of yarn rows including a first strand aligned with a second strand, the first and second strands being interlocked via stitches disposed at selected locations along a length of the yarn row, wherein:
the strands of the plurality of yarn rows are not secured to a substrate,
the stitches of the plurality of yarn rows define a stitch density within the upper, the stitch
density being the number of stitches present within a selected area of the upper,
a first selected area of the upper possesses a first stitch density and a second selected area of the upper possesses a second stitch density, and
the first stitch density is greater than the second stitch density;
a channel formed by a plurality of channel strands secured by channel stitches; and
an element positioned within the channel such that each channel strand of the plurality of channel strands extends from a first lateral stitch on a first lateral side of the structural element, over the structural element, and to a second lateral stitch on a second lateral side of the structural element.
12. The upper according to claim 11 , wherein the element is a structural element, a compression element, a support element, or a combination thereof.
13. The upper according to claim 11 , wherein the channel covers a length of the structural element.
14. The upper according to claim 11 , wherein each distance between adjacent stitches along the yarn row is 5 mm or less.
15. The upper according to claim 11 , wherein the structural element is a tensile strand formed of material possessing a tensile strength of at least 1000 MPa.