The main process parameters of sizing include: sizing rate, damping rate, press-out damping rate, elongation, sizing enhancement rate, sizing elongation reduction rate, total solids of sizing liquid, etc.
1, sizing rate:
After sizing the dry weight of the warp yarn on the dry weight of the original warp yarn before sizing percentage.
Sizing rate (%) = dry weight of pulp * 100% / dry weight of the original warp yarns
In the actual production of sizing rate fluctuations should be controlled at ± 1% in the right. Sizing pass rate should be greater than 95% is good.
2, moisture back rate:
Sizing damping rate is the percentage of water content on the dry weight of the sizing.
Moisture return rate = (sizing wet weight - sizing dry weight) * 100% / sizing dry weight
Moisture back rate is too large to cause the weaving opening is not clear, the moisture back rate is too small, will cause brittle head, in the actual production, the moisture back rate fluctuations should be less than ± 0.5%, the moisture back rate should be mastered in the 90% of the best.
3, press out of the dampness rate:
The weight of water contained in the sizing yarn before entering the drying room after the sizing roller, the percentage of the dry weight of the sizing yarn.
4, elongation:
Warp yarn sizing yarn elongation of the original warp yarn length of the percentage.
Sizing elongation % = (sizing length - the original length of the warp yarn) * 100% / the original length of the warp yarn
General sizing elongation mastered in 0.5-1.5% is appropriate.
5, sizing enhancement rate:
The breaking strength of the sizing yarn and the breaking strength of the original yarn of the difference between the breaking strength of the original yarn of the percentage of the breaking strength.
Sizing enhancement rate of % = (sizing breaking strength - the breaking strength of the original yarn) * 100% / the breaking strength of the original yarn
6, sizing yarn elongation reduction:
Sizing before the original warp yarn of the difference between the breaking elongation of the original yarn breaking elongation of the percentage.
The sizing of the elongation reduction rate of % = (the breaking elongation of the original yarn - sizing the breaking elongation) * 100% / the breaking elongation of the original yarn
7, the total solids of the pulp:
Pulp mixing end of fixed volume, fixed viscosity, fixed temperature after the total content of dry pulp in the slurry.
Total solids % = dry weight of pulp * 100% / (water weight in the pulp + dry weight of pulp)
8, and slurry composition:
Slurry contained in a variety of slurry, according to the process design ratio mixed into a slurry. Including: water, the main slurry and auxiliary slurry three major parts.
Main slurry: mainly adhesive.
Auxiliary slurry: In order to make the sizing after the yarn quality is better, the performance of the film is intact, mixed with the relevant auxiliary slurry. Such as: decomposition agents, lubricants, preservatives, penetrating agents, defoamers, antistatic agents, softeners, hygroscopic agents, abrasive agents and so on.
9, the pulp process of the three fixed:
Fixed concentration, fixed viscosity, fixed temperature.
Concentration: in the slurry, the total dry weight of the slurry content. In the case of other conditions remain unchanged, the concentration directly affects the sizing rate, the concentration is high, the sizing rate is high.
Determination of concentration methods are: (1) concentration meter: such as Boomerang meter, sugar meter, etc.. (2) Baking method. (3) Calculation method. The actual production operation, the concentration of commonly used slurry volume, also known as the fixed product method.
Viscosity: the viscosity of the slurry is related to the penetration of the slurry. Viscosity is small, fluidity, penetration is better, so that the adhesion between the fibers and hold better, less relative slippage between the fibers, is conducive to the enhancement of sizing, reduce breakage.
Determination of viscosity methods: (1) laboratory commonly used NDJ-79 type rotary viscosity machine. (2) production operations commonly used funnel viscometer.
Temperature: it is the temperature when the specified thickness and viscosity are fixed, and the temperature of the slurry is related to the viscosity of the slurry.
10, slurry immersion, phi re and slurry film integrity:
The soaking of the slurry, phi re, and the integrity of the slurry film directly affects the quality of the slurry yarn. Soaking and sizing yarn strength. The batch is related to the smoothness and abrasion resistance of the sizing yarn. The integrity of the film is related to the abrasion resistance and hairiness of the sizing yarn.
Soaking: In the process of sizing, the sizing liquid enters into the yarn to make the fibers bond with each other and increase the strength.
Slurry batch: the slurry in the yarn exterior coating a layer of slurry film, so that the surface of the slurry yarn smooth, reduce hairiness, weaving wear resistance. Batch size will affect the quality of sizing, batch is too large, the penetration is less caused by the surface sizing, drop pulp more, weaving caused by brittle break; batch is small incomplete, easy to hair.
Sizing film integrity: sizing in the yarn surface coating the degree of integrity of the sizing film.
11, with pulp quota:
A ton of dry warp yarn used in the main amount of pulp (kg / ton) is one of the economic indicators of accounting product costs
Enterprise assessment of the pulp quota is also commonly used per meter of blank cloth consumed by the cost of pulp to account for (yuan / m)
12, sizing efficiency:
Laboratory measured sizing rate in line with the process design requirements of the percentage of sizing rate.