Weaving is the process of interlacing warp and weft yarns at right angles to form fabric. Historically, shuttles were used to pass the weft yarn through alternating raised and lowered warp yarns (shedding), but now shuttleless looms using air, rapier or projectile mechanisms are more common. The key steps in weaving are warping to prepare parallel warp yarns, sizing the warp yarns, drawing the yarns into the loom, shedding to separate warp yarns, picking to pass the weft through, and beating-up to push the weft into place. Weaving involves the interlacing of the length-wise warp