Textile pulps are classified into three major categories: starch, polyvinyl alcohol (PVA) and acrylic pulp. At present, the three main types of slurry are still used at home and abroad. There are about 1 million looms in China, of which about 30% are shuttleless looms. According to relevant information, in 2006, the output of cloth was 43.797 billion meters, and the annual consumption of pulp was over 300,000 tons. Among them, starch (including modified starch) accounts for more than 70%, PVA dosage is less than 20%, and acrylic acid and other pulps are about 10%.
We all know that sizing is to add some slurry to the warp yarn, and there are some problems when sizing. When some warp yarns are sizing after sizing, the yarn is excessively woven, the machine is frequently stopped, and the efficiency is too low. If this problem is encountered, it is indicated that this is due to the poor film forming property of the slurry, which causes the slurry to affect the weaving, and as the filament slurry, the water resistance and the adhesion are emphasized. The water resistance of the slurry is poor, causing partial dissolution of some of the slurry film, and the slurry is smeared during weaving to block the steel slag, causing the warp to stop. On the other hand, due to the poor adhesion of the slurry, the fiber cannot be completely bundled, due to the weaving due to the weaving. The hairiness caused by the tearing of the monofilament affects the weaving.
Sizing is the key process of weaving engineering. The purpose of sizing is to improve the wear resistance of the yarn, reduce the hairiness, increase the strength of the yarn, and reduce the elongation to withstand the complex mechanical action of the yarn in the weaving process. Improve the woven properties of the yarn. Starch has a long history of warp sizing. This is because starch is a kind of regenerative plant with abundant resources and low price. It has good adhesion to hydrophilic fibers (such as cotton and viscose), so it is in three. The largest amount of slurry is used in the largest category.