Bleached pulp

A cross-sectional view of kenaf is shown in Figure 3d. The ultimate cells are nearly cylindrical with thick cell walls. Kenaf fibers are shorter and coarser than those of jute. Both chemical (kraft) and mechanical pulps have been produced from kenaf, and successful demonstration mns of newsprint have been made for the Dallas Morning Nem, the St. Petersburg Times, and the Bakersfield Californian with a furnish of 82% kenaf chemithermomechanical pulp and 18% softwood kraft pulp. Kenaf fiber is also considered a substitute for jute and used in sacking, rope, twine, bags, and as papermaking pulp in India, Thailand, and the former Yugoslavia. RoseUe bleached pulp is marketed in Thailand. 

Direct Dyestuffs. The difference in the affinity of direct dyestuffs for ligneous and bleached pulps is considerably less than basic dystuffs, but direct dyes color bleached pulps more evenly because they are easily wetted and penetrate rapidly. 

Sodergren, A. (Ed.) (1991). Environmental Fate and Effects of Bleached Pulp Mill Effluents. Report No. 4031, Swedish Environmental Protection Agency. 

P introduced into THPS-bleached pulp (mgg pulp )... 

Figure 1.4. Brightness gain over the control (0.0% P-treated spruce TMP) v5. P found in the bleached pulp P(CH20H)4]2S04(THPS) was used as bleaching agent.

Bleaching is defined as any process that chemically alters pulp to increase its brightness. Bleached pulps create papers that are whiter, brighter, softer, and more absorbent than unbleached pulps. Bleached pulps are used for white or light colored paper. Unbleached pulp is typically used to produce boxboard, linerboard, and grocery bags. Of the approximately 65.5 million T (72 million tons) of pulp (including recycled pulp) used in paper production in the U.S. in 2000, about 50% is for bleached pulp.1... 

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