EFFECTS OF GRINDER SHOWER WATER TEMPERATURE ON THE RELEASE OF SPRUCE WOOD COMPONENTS INTO WATER

The effects of shower water temperature on the dissolution and dispers ion of spruce wood components into water was studied using a laborator y-scale grinder. Grinding trials with shower water temperatures of 90 degrees C, 120 degrees C and 140 degrees C were carried out and the am ounts of carbohydrates, lipophilic extractives and lignins released we re determined. A grinding trial was also conducted with CaCl2 present in the shower water. The amount of dissolved and dispersed wood compon ents increased with higher grinder shower water temperature. The incre ase was mainly due to the greater dissolution of polysaccharides conta ining mannose, galactose and galacturonic acid units. Substances conta ining glucose other than glucomannans, such as starch and monomeric gl ucose, dissolved at 90 degrees C. The dissolution of lignins increased slightly at higher shower water temperatures. The shower water temper ature did not significantly affect the amount or composition of disper sed lipophilic extractives. Addition of 40 mg/l CaCl2 to the shower wa ter suppressed the amount of lipophilic extractives in the process wat er by about 30%, but did not notably affect the release of carbohydrat es or lignins.