Quality of refiner groundwood pulp as related to handsheet properties and gross wood characteristics

✍ Scribed by Charles W. McMillin

• Publisher: Springer
• Year: 1969
• Tongue: English
• Weight: 824 KB
• Volume: 3
• Category: Article
• ISSN: 0043-7719
• DOI: 10.1007/bf00352303

✦ Synopsis

Pulp quality, in terms of a fiber shape factor S and a fiber length factor L, was determined for 96 pulps disk-refined from chips of varying characteristics. S was evaluated in terms of the Canadian Standard Freeness of the 48/100 fiber length fraction and is a parameter inversely proportional to specific surface. L is the percentage, by weight, of pulp retained on a 48-mesh screen and reflects the distribution by weight of fiber length in the whole pulp. S and L accounted for as much as 83 percent of the variation in handsheet properties. Properties were improved by using pulps displaying low values of S and relatively high values of L. Both S and L were related to specific refining energy and wood quality. S increased with increasing unextraeted chip specific gravity and rings per inch of growth rate but decreased with increasing latewood content and refining energy. L decreased with increasing refining energy, rings per inch of growth rate, and unextracted chip specific gravity but increased with increasing latewood.