In -Situ Precipitation of CaCO3 within Pulp Fibers Enhances Optical and Printing Properties of Paper
- Type: Conference Presentation
- Conference Type:
AIChE Annual Meeting
- Presentation Date:
October 31, 2012
- Skill Level:
We have studied the effect of fiber-loading with CaCO3 on paper sheets made from bagasse pulp. The bagasse pulp fibers were first soaked in a dilute aqueous suspension/solution of calcium hydroxide, and then, CaCO3 was precipitated in-situ within the fiber cell wall and/or lumen by passing CO2 gas through the pulp suspension. Standard laboratory sheets were prepared from the fiber-loaded pulp. Strength and optical properties of the sheets were determined using standard test methods. The sheets were printed in the laboratory using an IGT printability tester. It was observed that the fiber loading by in-situ precipitation of CaCO3 very significantly improved the light scattering coefficient of the bagasse pulp. As a consequence, the print through of the paper was decreased, which is particularly desirable in low gramage papers.