With the increase of needle looms and the higher requirements of the market for product quality, the correct development and use of slurry is an important issue on the front of China's textile industry.
Main properties of textile pulp
The main process properties of the textile pulp are: adhesion, viscosity, film formation, water solubility and hygroscopicity.
Adhesion is the ability to combine with each other when two or more objects are in contact. The sizing process relies on this property to allow the slurry to bond to each other between the fibers, increasing the ability of the warp to resist friction and other mechanical effects. Adhesion properties are closely related to sizing effect and sizing quality.
Viscosity is a flow characteristic when a liquid flows. The internal frictional resistance experienced when a liquid flows is called viscosity. Viscosity has an important factor in the sizing process. The viscosity and the slurry can be evenly and completely distributed in the yarn, which is also an important factor affecting the sizing rate.
3. Film formation
Film formation is another important property of the slurry. The warp sizing process requires that the slurry has a good film forming ability, and that the film is required to be applied to the warp yarn as completely as possible, and that the mechanical properties of the film are similar to those of the yarn. The film-forming substance is generally a linear polymer compound having a relatively flexible molecular chain or a linear polymer compound having a short chain branch. The film properties are closely related to the glass transition temperature Tg of the polymer compound. Generally, a linear polymer compound having a low Tg is relatively flexible and bendable, such as PVA; a linear polymer compound having a high Tg has a hard and brittle film and a large rigidity, such as: straight starch; Tg is too low The polymer compound, although the film is very soft, has too low strength and is highly viscous, and is not suitable for bulk slurry applications, such as polybutyl acrylate.
4. Water solubility and hygroscopicity
The water-soluble polymer compound must contain a hydrophilic group such as a hydroxyl group, an amide group, a carboxyl group, and an alkali metal salt thereof. Therefore, such substances must have good hygroscopicity. A certain hygroscopicity is advantageous in the sizing process and in the sizing of the sizing, so that the film can have better rigidity and flexibility and bendability. However, excessive hygroscopicity makes the film soft, sticky, and re-sticking, causing warp yarn breakage, reducing weaving efficiency, and increasing weaving defects.