Fancy thread fabrics generally use fancy threads as inserts, and fancy threads are often many times thicker than the base yarn. Differences in yarn length and tension create difficulties when weaving. Therefore, the number of pierced threads should be reduced in the reed teeth of the fixed-width reed of the warping machine. If the thickness difference is large, an empty reed should be added next to the fancy thread, so that the fancy thread has more room for movement during warping. It will not bulge on the beam and cause length differences. If you use knot thread or discontinuous loop thread or discontinuous corrugated thread as warp, it is better to use equidistant fancy thread. The knots do not overlap each other. If the fancy thread is broken and reconnected, it should also be noted that the knots and the adjacent warp yarns on both sides are staggered (even if the knots do not overlap). Non-equidistant knots are also available.
Cotton yarn must be sizing before weaving, and machine sizing is generally used. Since the fancy thread is thicker and rougher than the base yarn, if it passes through the size tank together with the base yarn, the fancy thread will be very hard, which is not conducive to weaving. Therefore, in the sizing process, the fancy wire can be lifted up with a twist rod alone, so that it can directly enter the drying room above the sizing roll without passing through the pulp tank. When some products only use a small amount of fancy threads as inserts, a gallows can also be temporarily made behind the sizing machine, so that the fancy threads can enter directly without going through the sizing tank. In this method, the tension must be well controlled, otherwise it is not conducive to weaving . State-of-the-art equipment features dual warp beams to maintain equal output for even tension and flat fabric.
No matter what shape the fancy thread is, its appearance is relatively rough, and there will be more friction when passing through the heddle eye. In order to reduce the friction of the fancy wire at the heald eye, the welding eyelet with a larger heald eye must be selected according to the thickness of the fancy wire. Surface effects that cause warp yarn breaks or damage fancy threads at the junction of the heald eye.
Fancy yarns are often interlaced with yarns of different thickness and linear density, so the number and density of thick and thin yarns need to be different relative to their linear density, that is, the number of warp yarns inserted into each reed should be different. However, sometimes it is difficult to pass even a single reed. At this time, two methods can generally be used: if the product is produced in a small batch, the method of pulling the reed teeth can be used, that is, the reed teeth that penetrate the knot line can be used. Pull out a reed piece in the middle to double the spacing of the reed teeth; if the production batch is large and relatively fixed products, a thin and dense reed can be designed according to the process requirements. The distance between each tooth of this reed is based on the fabric structure. It is specially designed according to the number of warp threads per reed. This kind of fabric can achieve better effect and more balanced appearance through different finishing processes.
