Double needle bar basic lapping principles

Using only one fully-threaded guide bar, overlapping on one bed only will produce a single-faced structure. Overlapping on both beds will produce a double-faced structure but this will only be cohesive if each guide overlaps at least two different needles in one of the beds during the repeat. To understand the appearance and properties of two-bar structures, it is necessary to consider the lapping movements that occur on each needle bed in isolation, as if produced by two separate guide bars.

Figure 29.1a illustrates a lapping movement which is unsatisfactory because the warp threads cannot hold the double-faced wales of loops together. Although the raschel lapping movement is 2-0,4-6/ the overlapping on the front bed is always 4-6, which is equivalent to a closed lap chain on each bed. Thus the wales cannot be held together in either bed.

Figure 29.1b illustrates the simplest lapping movement that can produce a cohesive structure. In this case the lapping movement is 2-4,4-6/4-2,2-0. On the front bed, upright loops are produced because an open lap pillar stitch notation 2-4/4-2 is lapped, whereas on the back bed the lapping movement is 4-6/2-0, which causes alternate courses to be inclined in opposite directions, but ensures that the wales are held cohesively together (Fig. 29.2).

Held Stitches Notations
Fig. 29.1 Double needle bar lapping notations.
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  • Semhar
    How to read lapping movement of guide bars?
    7 years ago

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