Abstract:

The moisture absorption and liberation regularities of textile sizes was studied to provide theoretical basis for setting up the relative humidity in weaving workshop. According to the national standards, the oven drying method was used to analysis the moisture absorption and liberation regularities of starch size, polyrinyl alcohol (PVA ) and polyacrylic acid sizes. The differences of moisture absorption and liberation regularities among the sizes were also analyzed from their structures. The reslts show that for the moisture absorption performance at the same relative humidity, the polyacrylamide is the best, the starch is better than PVA, and  polyacrylate is the worst. It means that polyacrylate is not sensitive to humidity. The liberation regularities of variety sizes show that starch size and polyacrylamide have higher moisture regains. The final moisture absorption regains and liberation regains of sizes under the relative humidity of 56% indicate that absorption hysteresis exists.

Key words: moisture absorption property, moisture absorption rate, moisture liberation curve, moisture regain