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Then, the upper group is lowered by the loom mechanism, and the lower group is raised (shedding), allowing to pass the shuttle in the opposite direction, also in a straight motion.
Repeating these actions form a fabric mesh but without beating-up, the final distance between the adjacent wefts would be irregular and far too large.
Some carry the filling yarns across the loom at rates in excess of 2,000 metres per minute. The warp is sized in a starch mixture for smoother running.
Manufacturers such as Picanol have reduced the mechanical adjustments to a minimum, and control all the functions through a computer with a graphical user interface. The loom warped (loomed or dressed) by passing the sized warp threads through two or more heddles attached to harnesses.
The longitudinal threads are called the warp and the lateral threads are the weft or filling.
Every time the harness (the heddles) moves up or down, an opening (shed) is made between the threads of warp, through which the pick is inserted.The threads of the warp extend in parallel order from the warp-beam to the front of the loom where they are attached to the cloth-roll.