Experimental
Fiber furnish
The OCC pulp was produced from commercially available corrugated paper box flats obtained from a local box maker. The boxes did not have any labels or hot-melt adhesive, and their recycled fiber content was unknown. Six different batch samples of hydropulped OCC were made using a high-consistency laboratory hydropulper. The start temperature of the hydropulper water was 45°C, the batch OCC dry-weight was 4.5 kg, and batch consistency was 10 percent. The pro-cessing time for each batch varied, starting at 20 minutes and increasing to intervals of 40, 60, 120, 180, and 240 minutes. Small-diameter (less than 10 cm [4 in]) lodgepole pine treetops were used as the virgin raw material for this study (Hunt 2001). The treetops were obtained from the Bighorn National Forest and Wyoming State Forest.