Technical Bulletins
 

Files

Download

Download Full Text (1.8 MB)

Description

This study was made to determine the potential of softwood thinnings and standing dead softwood as a source of wood pulp, employing the kraft process. In the thinning studies examined eastern white pine, eastern hemlock, balsam fir, norway spruce, red pine, eastern larch, and northern white cedar. The stem (wood and bark) and the top (wood, bark, and needles) and the stem and top combined were pulped. When compared with pulp from a commercial-size softwood species, the thinnings provided pulps of good strength that were slightly undercooked and that had significantly lower yields. The stem portion pulps were superior in all cases to those made from the top portion. This is attributed to the foliage and higher bark content of the branches of the top which resulted in relatively low yields. The brief study of the characteristics of standing dead softwood trees, either killed by fire or natural attrition, indicated that they compare favorably with the live thinnings as a source of pulp when yield and physical properties are the criteria. It was concluded from this study that 35-4 0 percent of the thinnings material is available as a good grade of wood pulp.

Document Type

Article

Volume

82

Publication Date

7-1-1976

Publisher

Life Sciences and Agriculture Experiment Station

City

Orono

Keywords

wood pulp, forest thinning

Disciplines

Wood Science and Pulp, Paper Technology