Common sulphate cooking of beach and oak wood
2014
Seman Blažej | Geffert Anton
This work deals with common sulphate cooking of heartwood (oak) and sapwood (beech) and their influence on the sulphate cooking process. Sulphate pulp from beech, oak and from the mixture of both was prepared under the same conditions. In the prepared unbleached pulp were observed the characteristics of sulphate batch. Part of the pulp was bleached by sodium chlorate. The unbleached and bleached pulps were determined the selected mechanical features, optical features and dimensional characteristics of the pulps. In common sulphate batch of different wood species occurs to the influence of each other. It is caused by differences in characteristics between the heartwood and sapwood. Different wood structure affects the rate of penetration of the cooking liquor into the chips. Then it is reflected in the manufacturing process of bad impregnating of the chips by cooking liquor. These results are the lower yields, increased volume of rejects, tearing the paper in the pulp machine and worse optical features of pulps.
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