engleski

A new pre-wet sizing process – yes or no?

The paper describes the results of changed size viscosity as a function of temperature, concentration and shearstress. The rheological properties of size with various concentrations in combination with components of synthetic sizing agents on the basis of polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) were investigated. Size viscosity increased with decreasing temperatures and increasing the spindle speed of the viscometer. Breaking force and abrasion resistance of the yarn sized under different rheological conditions by changing the temperature of sizing were examined. Measurement results show that by changing size temperature from 50 oC to 80 oC the breaking force of yarn mostly increased too. A change in size temperature affects yarn abrasion resistance, but these changes do not follow the linearity of breaking force either which is expressed by a comparison of synthetic sizing agents with the same concentrations.

Rheological properties of size, Size viscosity; Newtonian and non-Newtonian fluids; size concentration

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