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

Containers were made from nominal 42-pound starch surface-sized linerboard consisting of 50% high-yield kraft pulp from Colombian hardwoods and 50% western kraft softwood pulp. Containers were also made from 26-pound corrugating medium made from 100% high-yield kraft Colombian hardwood screenings. These containers did not have as high a compressive strength as containers used for controls. The combined board and linerboards were slightly low in bursting strength. Screened pulp from high-yield digestions had about 30% less bursting strength and tearing resistance than the fully cooked pulp and about 20% less tensile strength. This study concludes that: (1) corrugating medium made from 100% high-yield kraft screenings can be fluted and combined with linerboard made from 50% high-yield kraft hard-wood screened pulp and 50% western softwood unbleached kraft pulp; (2) corrugated fiberboard containers can be made from nominal 42-pound, starch surface-sized linerboard consisting of 50% high-yield hardwood screened pulp from Colombia and 50% western kraft softwood pulp, and 26-pound corrugating medium made from 100% high-yield hardwood screenings; and (3) the corrugating medium made from the NSSC pulp fractured when fluted on the singlefacer and indicated a potential problem with utilization of tropical hardwood NSSC pulp in medium. Evaluation data are included.