Linerboard, corrugating medium, and corrugated containers from mixtures of Philippine hardwoods

FOREST SERVICE, IN COOPERATION WITH THE UNIVERSITY OF WISCONSIN, CONDUCTS EXPERIMENTAL RESEARCH ON THE POTENTIAL USES OF WOOD PRODUCTS NATIVE TO DEVELOPING COUNTRIES. THIS REPORT PRESENTS THE METHODS AND FINDINGS OF A PROGRAM DESIGNED TO ASSESS THE USE OF PHILIPPINE HARDWOODS IN MAKING LINERBOARD, A CORRUGATING MEDIUM, AND CORRUGATED CONTAINERS. CORRUGATED FIBERBOARD CONTAINERS WERE SUCCESSFULLY MADE FROM NOMINAL 42-POUND LINERBOARD CONSISTING OF 50 PERCENT HIGH-YIELD KRAFT PHILIPPINE HARDWOODS AND 50 PER-CENT WESTERN KRAFT SOFWOOD PULP, AND FROM A 26-POUND CORRUGATING MEDIUM MADE FROM 100 PERCENT HIGH-YIELD KRAFT PHILIPPINE HARDWOOD SCREENINGS. THE CORRUGATING MEDIUM MADE FROM NSSC PULP FRACTURED WHEN FLUTED ON THE SINGLEFACER AT 20 FEET PER MINUTE AND MINIMUM TENSION. OF THE FACTORS STUDIED, ONLY INCREASING THE BASIS WEIGHT OR APPLYING STARCH AS A SURFACE SIZE IMPROVED THE BURSTING STRENGTH TO 100 OR ABOVE. SCREENED PULP FROM HIGH-YIELD DIGESTIONS HAD ABOUT THE SAME BURSTING AND TENSILE STRENGTHS AS THE FULLY COOKED PULP, BUT ABOUT 13 PERCENT LESS TEARING RESISTANCE.