Capillary Viscosity Analysis of Paper Coating Colors in a Paper Mill
Kekkonen, Axel (2022)
Kekkonen, Axel
2022
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2022070150900
https://urn.fi/URN:NBN:fi-fe2022070150900
Tiivistelmä
The capillary viscosity behavior of several coating colors used in a paper mill were analyzed with the ACA-AX100 capillary viscometer. The repeatability of the capillary viscometer was determined. The impact of the temperature and solids content of the coating colors was measured. Average viscosities of all coating colors and their variations were also determined. Finally, the correlation between the capillary viscosity and Brookfield viscosity was calculated to decide if using Brookfield viscosity to control the viscosity of the coating colors is enough for the paper mill.
The repeatability of the capillary viscometer was determined to be sufficient.
The temperature analysis shows the influence of temperature on the viscosity of the coating color in the paper coating process. The already high viscosity coating colors measured have a larger increase in the viscosity with lowering temperatures than the low viscosity coating colors.
The dilution analysis shows that the viscosity of all measured coating colors decreases exponentially with a decrease of solids content, meaning even small amounts of added water into a coating color will significantly lower its viscosity.
The correlations between Brookfield and capillary viscosities were calculated through multiple regressions analysis with and without additional factors. Without the use of additional factors, the correlations were determined to not be sufficient, meaning Brookfield viscosity would not be enough to control the viscosity of the coating colors. However, with the addition of factors such as solids content, temperature and coat weight to the analysis, the correlations were determined to be sufficient for most coating colors.
The repeatability of the capillary viscometer was determined to be sufficient.
The temperature analysis shows the influence of temperature on the viscosity of the coating color in the paper coating process. The already high viscosity coating colors measured have a larger increase in the viscosity with lowering temperatures than the low viscosity coating colors.
The dilution analysis shows that the viscosity of all measured coating colors decreases exponentially with a decrease of solids content, meaning even small amounts of added water into a coating color will significantly lower its viscosity.
The correlations between Brookfield and capillary viscosities were calculated through multiple regressions analysis with and without additional factors. Without the use of additional factors, the correlations were determined to not be sufficient, meaning Brookfield viscosity would not be enough to control the viscosity of the coating colors. However, with the addition of factors such as solids content, temperature and coat weight to the analysis, the correlations were determined to be sufficient for most coating colors.