Publicación: COMPRESSION WOOD IN PINUS RADIATA III: KRAFT PULP PROPERTIES
Fecha
2012
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MADERAS: CIENCIA Y TECNOLOGIA
Resumen
PREVIOUS STUDIES WITH RADIATA PINE TREES GROWING SLIGHTLY LEANED TOWARDS ONE SIDE SHOWED THAT THEY HAVE SMALL AMOUNTS OF COMPRESSION WOOD WITH DIFFERENT CHARACTERISTICS THAN THE OPPOSITE WOOD AT THE OTHER SIDE OF THE ANNUAL RINGS. THESE DIFFERENCES INCLUDE SHORTER TRACHEIDS, HIGHER DENSITY, HIGHER PROPORTION OF LINING, HIGHER PROPORTION OF EXTRACTIVES IN TOLUENE ETHANOL, AND A SMALLER AMOUNT OF ALPHA-CELLULOSE.
THE PRESENT STUDY COMPARES THE PROPERTIES OF KRAFT PULP, WITH AND WITHOUT BLEACHING, FOR MIXTURES OF COMPRESSION AND OPPOSITE WOOD OBTAINED FROM FIFTEEN 22-YEAR-OLD RADIATA PINE TREES THAT GREW IN HUMID SAND SOILS OF CHILE. THE KRAFT PULP MIXTURE WAS STUDIED FOR DIFFERENT PROPORTIONS OF 0, 40, 70 AND 100% COMPRESSION WOOD. CONSIDERING ALL MIXTURES WITH AND WITHOUT BLEACHING, THE STUDY REPORTS VALUES BETWEEN 501 AND 695 KG/M3 DENSITY, 28 AND 51 NM/G TENSION INDEX, 18 AND 25 MNM2/G TEAR INDEX, 2,2 AND 4,1 KPAM2/G BURST INDEX, AND 44% AND 50,6% PULP YIELD.......
