Plain tricot structures knitted with two full set guide bars are by far the most popular of all warp knitted structures and are mainly based on a two-course repeat cycle with a change of direction lap at each course.Although the majority have been made on 28-gauge tricot machines using 40 denier nylon, other gauges, yarn types and counts, and also raschel machines, are used.
The two bars make different lapping movements because, if they were both to make the same lapping movement a structure having single needle bar characteristics would be produced. Each guide bar contributes a thread to every overlap and the two underlaps can be clearly distinguished as they lap to a different angle, extent or direction. Under normal conditions, the threads of the front guide bar tend to dominate the face as well as the back of the fabric (Fig. 25.1).
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