The slurry film formed by starch slurry on cotton gauze fabrics feels stiff and brittle, and is easy to break. In order to eliminate this shortcoming, reduce breakage, and improve the fabric style to make the cotton gauze fabric feel soft, softness must be added to the slurry. agent.
The reason why cotton gauze fabric textile softener can make sizing soft is because the softener is pre-emulsified oil, which is dispersed into very small particles after stirring and evenly distributed in the slurry. After drying, the oil-containing slurry is like a sponge, deforming under stress, so that the serofilm and the fibers have a smaller static friction factor, thus having better softness and elongation. Generally speaking, the smaller the diameter of the oil particles and the more uniform the dispersion in the slurry, the better the softness. The best oil particle diameter of the softening oil agent is 1~2pm. Oil particles smaller than 1pm will quickly penetrate into the fiber, thereby reducing the softness of the serous film.
It can be seen from the softening mechanism that liquid oil has the best softening effect, but if it is not mastered well, oil stains and defects may easily occur. Cotton gauze fabric textile mills traditionally prefer to use solid beef and mutton fat (freezing point: 40~48°C) or semi-solid lard (freezing point: 36~38°C) at room temperature. These beef and mutton fats or lard must use emulsifiers with good hydrophilicity, that is, oil-in-water surfactants, to improve the stability of the oil particles in the slurry.
