Effect of sodium alginate on warp sizing

　　Effect of sodium alginate as warp sizing.

　　1. The slurry mixing operation is convenient, the formula is simple, and other auxiliary slurries (such as sodium silicate, talcum powder, grease, etc.) are saved or used less. The sizing tank is easy to clean, which reduces the labor intensity of sizing workers.

　　Second, high-temperature sizing, slurry permeability is good, viscosity is stable, and the remaining slurry does not deteriorate (when the temperature is high, appropriate preservatives are added to facilitate recycling).

　　Third, the bonding situation of the guide roller in the wet zone of the drying room is better than that of sodium carboxymethyl cellulose pulp, and the drying efficiency is higher than that of starch pulp and sodium carboxymethyl cellulose pulp.

　　Fourthly, there are fewer defects such as sizing spots, doubling heads and twisting heads, and the sizing yarn is not easy to break at the reed teeth, which is beneficial to operation and can improve the quality of the sizing shaft.

　　5. The sizing rate is low (generally 1/3 to 2/3 lower than that of starch), and the winding capacity of the pulp shaft can be increased by 10% to 15%, which correspondingly improves the let-in and loom efficiency.

　　Six, the weaving opening is clear, the warp ends are the same as using starch pulp, and the production is stable.

　　7. The sodium alginate slurry has good hygroscopicity, and the relative temperature in the weaving workshop can be reduced to 65% ~ 70%.

　　Eight, printing and dyeing desizing is easy, which not only saves chemical raw materials, but also ensures bleaching degree, brightness, color fastness and strength.

　　9. At 20℃ and 1% concentration, the viscosity of sodium alginate solution can reach 0.3 ~ 0.5 Pa s, but its density is only 1.025g/cm3. When sizing with pure sodium alginate, the sizing rate is generally controlled at 3.0% ~ 5.5%, which is 40 ~ 50% of starch slurry.

　　X. The size film formed by heating and drying the sodium alginate solution is similar to the sodium carboxymethyl cellulose size film, and is tougher than the starch size film, which is beneficial to the reinforcement and elongation reduction of warp yarns.

　　Eleven, sodium alginate can be mixed with any proportion of starch, sodium carboxymethyl cellulose, polyvinyl alcohol, polyacrylamide and so on, and the effect is good.