Patent ID: 7696110

Claim:
A sheet material for a seat comprising a sheet material formed out of a knitted fabric in which an insertion yarn is used, a ground structure forming the knitted fabric being formed out of a combined texture of chain stitch in every course in at least one guide bar of a knitting machine and knitting stitch of 3-8 needle shogging in every course in at least one other guide bar of the knitting machine, the insertion yarn being a warp yarn inserted in a direction equal to or reverse to an underlap direction of the knitting stitch of the ground structure with a shopping width of 3 needle shopping or less per course, and the sheet material having a stress at 5% elongation (A) of from 40 to 300 N/4 cm width, where A is a stress measured in a longitudinal direction and a ratio A/B is from 1.5 to 15.0, where B is a stress measured in a lateral direction and a reduction in width (H) of from 0 to 15% when the sheet material is fixed on a frame at one end and at an opposite end while being stretched and pressured.