The relationship between decoration and density
When designing plain fabrics, the density of warp and weft yarns has a greater impact on the loom construction. The specific situation is as follows: (1) First, we must understand the large density range that the silk loom can weave. For example, the density range of the K274 silk loom is 6.9-114 threads/cm, and it has weavability as long as it is within this range during design. (2) In the warp direction, the influence of warp density on heald density should be considered to study whether there is weavability. Of course, heald density is not only affected by warp density, but also by fabric structure, warp raw materials, and heald threading methods. Commonly used The heald density range is 7-2. If it exceeds this range, the number of healds should be increased accordingly. 
Heald density (roots/cm) = number of inner warp wires (reed inner width The warp density design is restricted by the number of needles and pattern width of the jacquard machine. The installation mode is usually determined based on the warp density and pattern width. When the pattern width and the number of pattern needles are certain, the density needs to be increased and hoisting can be used. However, this It must also be within the same range as the number of needles. In addition, the increase or decrease in warp density is also restricted by the number of ground tissue cycles. In short, the design of warp and weft density is affected by many factors and should be considered comprehensively. Based on silk, viscose silk and tussah silk, the commonly used linear density and tissue density requirements are listed in Table 7-3 for reference during design. Since the weft density can be adjusted during the trial weaving process, the weft density design has greater sensitivity. However, some fabrics that have strict requirements on pattern appearance, such as group flowers, squares, elephant scenes, etc. cannot be adjusted arbitrarily, otherwise it will cause The pattern is deformed and becomes a defective product. When designing, the weft density of the fabric is generally less than the warp density. This is mainly because the linear density of the warp threads is thin, the quality of the warp threads is good, the tension on the machine is large, and the threads are complete, which has a greater impact on the quality of the fabric. The weft density is small It is helpful to improve production efficiency, and it is easy to remove weft when weaving defects occur. The meridional density reference is shown in Table 7-3. 
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