Abstract:

In order to study sizing of the granular cold water soluble potato starch (GCWS) at low temperature, GCWS was prepared by optimized alcohol-alkaline method. The sizing performance of GCWS including viscosity, adhesion capability, sizing ratio, enhancement ratio and abrasion resistance were tested when the yarns were sized at low temperature from 65℃ to 95℃. The size property of GCWS was compared with the industrially used potato oxidized starch to validate the feasibility of sizing of GCWS at low temperature. The experiment results indicated that the viscosity of GCWS potato starch from 65℃ to 95℃ is low, which meets the requirement of pulp with low viscosity. The adhesion of GCWS potato starch is close to that of potato oxidized starch from 85℃ to 95℃, while the adhesion of GCWS potato starch is slightly lower when sizing at 65℃ to 75℃. According to the sizing experiments with single yarn from 75 ℃ to 95 ℃, the enhancement ratio and abrasion resistance of GCWS potato starch are larger than 25.49% and 38.89%, which are close to the corresponding property of potato oxidized starch at 95 ℃, meeting sizing requirements at low temperature. The sizing property of GCWS, therefore, is close to that of potato oxidized starch, and GCWS is applicable for sizing at 75℃ which can reduce energy consumption due to high concentration and low viscosity.

Key words: alcohol-alkaline method, cold water soluble starch, potato starch, low temperature sizing