Technological process of flannel fabric: singeing, desizing, bleaching, mercerizing, fleece, scouring.

1. Singeing, whether the flannel needs singeing, should be decided according to the fabric organization and processing requirements. Under normal circumstances, flannel does not need singeing, such as printed single-sided fleece. If the printed pattern is printed on the fleece side, singeing loses its meaning. However, printed single-sided velvet, such as the printed pattern, is printed on the non-velvet side, and the non-velvet side can be singed.

2. Desizing, (cooking) if the size on the flannel is not cleaned, the fibers will be adhered to the pulp, which will affect the fuzzing effect. Therefore, the flannel must not only be desizing, but also require a good desizing effect. At the same time, it is required to maintain a certain amount of wax on the fabric before flocking, because the presence of wax is conducive to the insertion and detachment of the raising needles and improving the raising effect. In order to maintain the waxiness of the fabric, the general flannel may not be scoured, but without scouring, the impurities on the grey fabric cannot be removed, which will affect the appearance of the finished product.

3. Bleaching, flannel bleaching generally adopts sodium hypochlorite bleaching process. Because the flannel is lightly scoured or not scoured, in addition to strengthening the desizing process, the bleaching process should also be strengthened. Only in this way can the quality of the semi-finished flannel scouring and bleaching be guaranteed. Flannel bleaching requires not only to ensure the strength of the fabric, but also to achieve the required whiteness standard, and the cloth surface should be free of cotton seed hulls.

4. After mercerizing and fabric mercerizing, the yarn twist increases, the fiber swells, and the warp and weft density changes accordingly. At the same time, mercerizing can also remove some natural oil wax on the fabric, thereby increasing the difficulty of raising fleece, so the flannel is generally No mercerizing is required. But mercerizing can reduce the shrinkage rate, increase the vividness of the color and improve the printing effect of the calico, so the question of whether the flannel should be mercerized is still worth studying.

5. Raising, bleached velvet and dyed velvet are generally padded with softeners separately before raising, and bleached velvet should be appropriately whitened with whitening agent and paint blue liquid, and then raised; printed velvet is bleached and dried. Generally, it can be raised directly.

6. After washing the fleece, the fabric will have a layer of fluffy fluff after being raised. The fabric feels very soft. Some short fluffs that are broken during the raising process are attached to the surface of the flannelette. These short fluffs must be removed. Otherwise, it will cause color dragging, slurry dragging, intarsia tube and other defects during printing.