A Study on the Shapness of the Sodium Alginate/Sodium carboxymethyl Cellulose Printing Paster

Sodium Alginate/Sodium carboxymethyl Cellulose 날염호의 첨예성에 관한 연구

The sharpness of a pattern depends on the variation in flow properties of thickeners, which can be brought by mixing of the thickening agents. In the present study, sodium alginate and sodium carboxymethyl cellulose were used as single or mixed thickening agent. The variation in flow properties of various thickeners was measured and analyzed through flow curve, structural viscosity index, thixotropy, spinnability and viscosity. Also the effect of the variation in flow properties on sharpness was measured and discussed. By mixing sodium alginate and sodium carboxymethyl cellulose, the viscosity reduces rapidly and the yield value decreases to the half that of sodium caroxymethyl cellulose, The structural viscosity index of sodium carboxymethyl cellulose 2% thickener shows the largest value among the thickeners used and those of 1/1 and 1/4 mixed thickener with sodium carboxymethyl cellulose are larger than that of sodium alginate alone. As for as the mixed thickeners are considered, the best sharpness is obtained when the mixed ratio of sodium alginate to sodium carboxymethyl cellulose is 1:4. The sharpness is improved proportionally to thixotropy.