Shifted angle fabric
View Patent ↗An apparatus and method for producing a shifted angle fabric and the product produced thereby. The apparatus includes a supply of fabric and a differential tenter frame. The differential tenter frame includes a frame, a pair of opposed, constant path rails and a differential drive. The differential tenter frame is located downstream from the supply of fabric for receiving the opposing edges of the fabric and advancing the opposing edges at different speeds to shift the weft angle of the fabric as the fabric travels the length of the differential tenter frame. A high velocity, low heat drying range adjacent to the differential tenter frame simultaneously dries the fabric as the fabric travels the length of the differential tenter frame. A take-up roll downstream from the differential tenter frame then takes up the dried fabric.
1. A shifted angle woven fabric having warp yarns and weft yarns, wherein said weft yarns are shifted between about 110 degrees and about 125 degrees relative said warp yarns, wherein the crimp of said fabric is substantially equal in both the warp and weft directions, and wherein side-to-side variation in warp yarn crimp is negligible.
2. The shifted angle woven fabric according to claim 1 , wherein said fabric is shifted about 112 degrees.
3. The shifted angle woven fabric according to claim 1 , wherein the ratio of warp crimp to weft crimp of said fabric is between about 0.5 and about 1.5 when crimp is measured according to ASTM-3883-90.
4. The shifted angle woven fabric according to claim 3 , wherein the ratio of warp crimp to weft crimp of said fabric is about 0.9.
5. The shifted angle woven fabric according to claim 1 , wherein the crimp of said fabric is between about 3% and about 10% in both the warp and weft directions.
6. The shifted angle woven fabric according to claim 1 , wherein the elongation value of said fabric is between about 35% and about 55% when tested according to ASTM-5034-95.
7. The shifted angle woven fabric according to claim 6 , wherein the elongation value of said fabric is about 55%.