| 摘要 |
A bias fabric having parallel, spaced-apart yarns oriented +/-45 DEG relative to the long axis of the fabric is formed by directing one or more pluralities of the yarns back and forth across the width of the fabric and securing the yarns around pins mounted on movable conveyors at the opposite sides of the fabric. Alternatively, the yarns are mounted on strips of film with the film strips being secured to the opposite conveyors. In one preferred embodiment one or more elongated yarn laying units arranged to supply yarns through apertures along the length thereof are cycled laterally between the opposite conveyors as the conveyors are moved at a controlled speed to form a 2-ply fabric, the yarns being wrapped around pins on the opposite conveyors using an adjustable roller arrangement mounted on the shuttle or a plurality of pin mounting rings the alternate ones of which move in unison so as to engage odd and then even numbered yarns in the yarn array. Slotted guides can be used in lieu of pins, with each different guide traversing a width of the fabric with the shuttle and then being mounted on a conveyor to hold the yarns in place. In an alternative embodiment, one or more rapier assemblies traverse the width of the fabric at a 45 DEG angle to lay groups of yarns back and forth across the fabric. Each yarn group is disposed around two different sets of pins on each conveyor to complete the turnaround. The bias fabric is stabilized prior to removal from the conveyors by various techniques including stitching threads along the length thereof, depositing beads of molten plastic along the length thereof, attaching an adhesive coated film or impregnating with and at least partially curing a resin.
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