Accession Number : AD0454833

Title :   THE EFFECT OF COOKING AGENTS ON WOOD. I. ALKALINE COOKING OF POPLAR WOOD. EFFECT ON STRENGTH AND COMPOSITION,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA SASKATOON (SASKATCHEWAN) PRAIRIE REGIONAL LAB

Personal Author(s) : Sinclair,G. D.

Report Date : 1964

Pagination or Media Count : 5

Abstract : Small specimens of wood were cooked in dilute solutions of NaOH, Na2S, Na2SO4, NH4OH, LiOH. The specimens were cooked in one-litre Erlenmeyer flasks fitted with reflux condensers. The loss of weight and strength and water sorption due to these cooking chemicals was determined. The wet breaking strength of poplar heartwood was reduced from 292 lb. to 118 lb. after cooking with 8 per cent NaOH for 2 hr. at atmospheric pressures. Poplar sapwood had an original strength of 386 lb. and this was reduced to 124 lb. after cooking for 2 hr. with 10 per cent NaOH. The loss in weight during cooking was greater for sapwood than heartwood. Sapwood sorbed less water than heartwood during cooking. Lithium hydroxide reduced the strength of the wood more than the other chemicals and also removed a greater percentage of wood. Cooked wood was analysed for holocellulose, pentosans and lignin. The 4ore severe cooking removed more holocellulose than the other two components. There appears to be a relation between the wet breaking strength of wood and the power needed for refining. (Author)

Descriptors :   (*WOOD, PROCESSING), (*PROCESSING, PAPER INDUSTRY), HEATING, SOLUTIONS(MIXTURES), HYDROXIDES, SULFATES, SULFIDES, AMMONIUM COMPOUNDS, LITHIUM COMPOUNDS, SODIUM COMPOUNDS, RUPTURE, WATER, SORPTION, CANADA

Distribution Statement : APPROVED FOR PUBLIC RELEASE