Footwear including a textile upper
An article of footwear includes a sole structure and an upper attached to the sole structure. The upper is formed from a textile including interlocked strands oriented in a predetermined configuration. The strands include one or more inelastic strands operable to provide stretch and/or recovery properties to the upper.
1. An article of footwear including a foot cavity, the article of footwear comprising:
a sole structure; and
an upper coupled to the sole structure, the upper defining a forward section including a toe cage section, a rearward section including a heel section, and an intermediate section disposed between the forward section and the rearward section, the upper comprising a knit structure with strands oriented in courses and wales, the strands including a plurality of bicomponent strands and a plurality of non-bicomponent strands, wherein a course spacing between individual bicomponent strands differs between the toe cage section and the heel section such that a first number of courses that separates each bicomponent strand from a nearest bicomponent strand within a portion of the toe cage section differs from a second number of courses that separates each bicomponent strand from a nearest bicomponent strand within a portion of the heel section, each bicomponent strand of the plurality of bicomponent strands comprising a first component polymer integrally formed with a second component polymer, the polymer components being oriented in side-by-side relationship along the length of the bilateral strand,
wherein the knit structure excludes elastomeric strands, and the first component polymer possesses a first rate of shrinkage and the second component polymer possesses a second rate of shrinkage, the first rate of shrinkage differing from the second rate of shrinkage such that, when each bicomponent strand is subjected to heat, coils are generated within the bicomponent strand to impart non-elastomeric, mechanical and stretch properties for the bicomponent strand such that the bicomponent strand is capable of recovering substantially to its original length upon being stretched.
2. The article of footwear according to claim 1 , wherein each bicomponent strand of the plurality of bicomponent strands is a polyester bicomponent strand comprising a first component polymer of poly(trimethylene terephthalate) and a second component polymer selected from the group consisting of poly(ethylene terephthalate), poly(tetramethylene terephthalate), and combinations thereof.
3. An article of footwear including a foot cavity, the article of footwear comprising:
a sole structure; and
an upper coupled to the sole structure, the upper defining a forward section including a toe cage section, a rearward section including a heel section, and an intermediate section disposed between the forward section and the rearward section, the upper comprising a knit structure with strands oriented in courses and wales, the strands including a plurality of bicomponent strands and a plurality of non-bicomponent strands, wherein a course spacing between individual bicomponent strands differs between the toe cage section and the heel section such that a first number of courses that separates each bicomponent strand from a nearest bicomponent strand within a portion of the toe cage section differs from a second number of courses that separates each bicomponent strand from a nearest bicomponent strand within a portion of the heel section, each bicomponent strand of the plurality of bicomponent strands comprises a coiled strand including a first polymer segment integrally formed with a second polymer segment such that the polymer segments are oriented in side-by-side relationship along the length of the bilateral strand, and wherein the bicomponent strand is configured to recover substantially to its original length upon being stretched; and wherein each of the first number of courses and the second number of courses, independently from each other, is from every second course to every tenth course.