Mechanical pulping with a sequential velocity refiner- a new concept

Abstract

In previous research with refiner mechanical pulps, a theoretical stress analysis indicated that longitudinal tracheids of Pinus taeda L. fail while under torsional stress and unwind into ribbonlike elements that provide the coherence necessary for strength development. When macerated tracheids of loblolly pine were individually stressed in torsion and observed in a scanning electron microscope, the unwinding process was characterized by the formation of a crack, generally parallel to the zone of weakness delineated by the S, layer fibril helix, followed by development of a ribbon with further twisting.

Citation

McMillin, C.W. 1978. Mechanical pulping with a sequential velocity refiner- a new concept. Svensk Papperstidning 18(567-574