Three samples of different wood densities of Douglas-fir
(Pseudotsuga menziesii (Mirb.) Franco) were cooked by
the kraft process. The yields and the Kappa numbers were
studied to establish the rates and the energies of activation
of the pulping and delignification reactions
respectively. Wood properties did not show significant
effects on...
High yield unbleached kraft pulp for linerboard and bag paper
was deshived in a PFI mill and a Bauer model 187 double disk refiner.
Levels of plate gap, specific energy consumption, throughput rate,
and stock consistency were varied to control PFI mill and Bauer 187
deshive refining. Shive content reductions...
Samples of Douglas-fir chips and western hemlock/true fir chips were pulped by the kraft and sulfite processes respectively. The spent liquors were analyzed for fluorescent response, and the fluorescent intensities of each liquor sample correlated with yields, Kappa numbers, and lignin contents of the pulps. Linear relationships were seen between...
A study has been made of the kraft pulping properties of young Douglas-fir trees which were thinned from an experimental plantation. The purpose of the plantation study is to determine, whether two year old seedlings can be selected on the criteria of height and branch count for future desirable tree...
Comparisons were made between anthraquinone modified soda pulp (soda-AQ), and methanol modified kraft (kraft-Me0H) and sulfite (sulfite-Me0H) pulps on western Oregon Douglas-fir. The kappa number, yield, brightness, and deshive values were all measured. The soda-AQ and kraft-Me0H pulps were the traditional brown color but the sulfite-Me0H pulps came out of...
Douglas-fir wood chips from Oregon were pulped with kraft
green liquor to produce semi-chemical pulps with properties suitable
for the manufacture of corrugating medium. The effects of five cooking
variables were studied, chemical charge, chip size, bark content
of chips, pulping temperature, and liquor sulfidity. The combinations
of levels of...
Sapwood and heartwood groundwood samples were prepared separately from a second growth, coastal range, young Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). The bleaching responses of these two groundwoods to zinc hydrosulfite were examined, and the roles of both dihydroquercetin and quercetin in this bleaching reaction were investigated. Heartwood groundwood was identified...
