New dyeing technology for colored non-woven fabrics

Non-woven fabric is formed by oriented or random arrangement of textile short fibers or filaments to form a fiber network structure, and then reinforced by mechanical, thermal bonding or chemical methods. It does not need spinning and weaving, and it can pursue a beautiful trend. Various requirements and restrictions and dyeing needs will be put forward for colored non-woven fabrics. Many non-woven fabric dyeing technologies are derived from the papermaking and textile industries. However, in order to meet the unique requirements of the non-woven fabric industry, the dyeing process and the chemicals used in dyeing must be improved. Non-woven fabric dyeing methods can be divided into two main types: fiber dyeing before fabric forming, base fabric dyeing after fabric forming, fiber dyeing before fabric forming, and wet end dyeing of cellulose fibers. The spunlace molding method can use rice to produce cellulose/synthetic fiber substrate, which is a composite of a layer of paper and a layer of synthetic fiber fabric. This composite fabric can be used as a disposable medical coat. In the wet process, the cellulose dyeing technique can be much shorter by step dyeing or continuous dyeing or beating dyeing. The dyeing process can quickly adjust the color. Compared with the step dyeing, the continuous type: the dyeing process produces less uneven color tone and provides it. Direct dyes have better color fastness. But not all are used for step by step. Acid dyes, basic dyes, cationic direct dyes. Pigments have direct dyes: direct dyes are usually sodium salts of organic compounds containing sulfonic acid groups or carboxylic acid groups. These anionic water-soluble dyes have a larger planar molecular structure that can fix the cellulose molecular chain. Due to van der Waals force, the dye and cellulose are well combined. The hydrogen bonding between the granting g on the dye molecule and the hydroxyl group on the cellulose also plays a good role in the affinity between the direct dye and cellulose. In fact. In many cases, using cationic dyes and anionic dyes at the same time can achieve better color fastness than any one of them. The synergistic effect produced by cationic direct dyes acts as a fixative for anionic direct dyes. Using this system can also make the white water clean. Improve softness and absorption and effectively reduce or eliminate fixatives. Synergistic effect when cationic and anionic direct dyes are used together. The total color fastness value is the sum of the color fastness values u200bu200bof five media (deionized water, 50/50 ethanol/water. 1 fatty acid salt, 0.25 wetting agent and pure emulsion). The color fastness grade ranges from 1 (large penetration) to 5 (no penetration). This western effect can only be shown when the selected cationic and anionic direct dye pairs are used together. Most of the technology is borrowed from the paper industry and textile industry, but the improvement of technology and raw materials has been developed to meet the unique needs of the color non-woven industry. Various processes for dyeing non-woven fabrics can be divided into two main types: one is to dye the fibers before the fabric is formed, and the other is to dye the formed fabric. Available step method and continuous process technology, but from the cost considerations tend to choose continuous process. Previous: Non-woven zipper bag that can be completely closed