Researches on Mechanical Wood Pulp. (Part VII).

Enzymatic Bleaching of Wood Pulp

The dark colour of kraft pulp after the wood chips have been heated at high temperature with NaOH solution is caused by lignin (a complex phenolic polymer) still attached to the cellulose fibres. Traditionally this pulp is treated with chlorine to bleach the pulp to make it suitable for paper making. Unfortunately this leads to the formation of some potentially toxic chlorophenolic compounds of...

Hæmatological Technique. Part VII

Effects of Some Wood Chip Properties on Pulp Quality

A series of TMP experiments were performed at CIPP’s TMP pilot plant, and some pulp properties were measured. By comparing chip and pulp properties, and using projections to latent structures (PLS) analysis, we were able to demonstrate that on-line CMS measurements can be used to predict some pulp properties. It should be pointed out that the focus of this paper is to show how CMS measurements ...

Estimating With Objects - Part VII

This column is the seventh in a series about estimating. The first was in the July 1996 issue. The most recent several columns have focused on estimates based on lines of code (LOC). There are, however, several types of source code as well as many other important product types. Examples are new, modified, and reused code, as well as documentation, screens, reports, and files. The principal ques...

Densification of Wood Veneers Combined with Oil- Heat Treatment. Part Ii: Hygroscopicity and Mechanical Properties

In an effort to achieve high mechanical performance and improved dimensional stability, densification combined with oil-heat treatment (OHT) was performed. In our previous study, OHT was successfully applied to densified veneer, which resulted in improved dimensional stability. In the present study, the impact of OHT on densified wood veneer hygroscopicity and mechanical properties was determin...