| abstract |
A method for preparation of a fibrous stock suitable for manufacture of paper out of herb-stemmed plants, such as, for example, straw or flax. The method comprises steps in which the fibrous raw-material is cut into chips, cooked, and bleached. As the cooking liquor, water is used to which an acid has been added so that the ultimate pH of the cooking is lower than 7 but higher than 3. For regulation of pH, it is possible to use an anorganic acid or some organic acid, such as formic acid or acetic acid or a mixture of same. By means of bleaching, it is ensured that the stock is defibrated. Favourably, peroxide is used as the bleaching chemical. |