Bleached wood chemical pulp usually gives opacities of approximately
70–80% for softwood and 80–85% for hardwood, at a basis
weight of 60 g/m2
. More than 10% higher ISO opacity for an equivalent
mass was obtained with red algae pulp. Table 3 shows the
chemical composition of the soluble carbohydrates in the extractsobtained from G. corneum after sodium thiosulfate extraction at
140 C. The red algae bleached pulp consisted of 64% cellulose,
27% galactose, 6% xylose, and 3% of other materials such as inorganic
ash. In comparison, bleached wood pulp consists of mostly
cellulose, small amounts of hemicellulose (mannan for softwood
and xylan for hardwood), and traces of lignin. The red algae extract
consisted of galactose almost exclusively. There is no lignin in the
red algae pulp and in the extracts of red algae.
Bleached wood chemical pulp usually gives opacities of approximately
70–80% for softwood and 80–85% for hardwood, at a basis
weight of 60 g/m2
. More than 10% higher ISO opacity for an equivalent
mass was obtained with red algae pulp. Table 3 shows the
chemical composition of the soluble carbohydrates in the extractsobtained from G. corneum after sodium thiosulfate extraction at
140 C. The red algae bleached pulp consisted of 64% cellulose,
27% galactose, 6% xylose, and 3% of other materials such as inorganic
ash. In comparison, bleached wood pulp consists of mostly
cellulose, small amounts of hemicellulose (mannan for softwood
and xylan for hardwood), and traces of lignin. The red algae extract
consisted of galactose almost exclusively. There is no lignin in the
red algae pulp and in the extracts of red algae.
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