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PHYSICAL AND OPTICAL PROPERTIES OF STEAM-EXPLODED LASER-PRINTED PAPER
Citation:
Sharma, A. K., W. K. Forester, AND E. H. Shriver. PHYSICAL AND OPTICAL PROPERTIES OF STEAM-EXPLODED LASER-PRINTED PAPER. TAPPI JOURNAL. TAPPI, Norcross, GA, 79(5):211-221, (1996).
Impact/Purpose:
information
Description:
Laser-printed paper was pulped by the steam-explosion process. A full-factorial experimental design was applied to determine the effects of key operating variables on the properties of steam-exploded pulp. The variables were addition level for pulping chemicals (NaOH and/or Na2SO3), digester pressure, digester residence time, and addition level for dispersant. Steam explosion removed laser toners from the fibers and dispersed the particles, as evidenced by the higher sheet brightness and opacity of exploded pulp compared with an unexploded control pump. However, the fiber-bonding ability of exploded pulp was lower than that for unexploded pulp, as evidenced by lower tensile index and relative bonded area. Zero-span breading length of exploded pulp also was lower, indicating that explosive discharge damage the fibers.
