To develop a new kind of functional textile material, viscose fiber was prepared from natural and antibacterial pineapple leaf fiber and its structures and properties were explored with analyzing methods of sensory evaluation, SEM, FT-IR, TG, DTG and DSC. The results showed that the prepared pineapple leaf viscose fiber was white, shiny, fine, smooth, soft, and somewhat curly with even fineness. Its arrangement was verticall y parallel with some obvious grooves. Irregular zigzaging and the skin-core structure were observed in cross section. The fiber had characteristic groups of cellulose and absorption peaks at 1737.74, 1506.23 and 1431.82 cm-1 almost disappeared, and it showed high purity. The pyrogenation mechanism of pineapple leaf viscose fiber was similar to that of pineapple leaf fiber, but thermal stability of pineapple leaf viscose fiber was slightly lower than that of pineapple leaf fiber. Pineapple leaf viscose fiber belonged to cotton-type viscose staple fiber. The basic properties met the requirements of the first grade of viscose fiber. The mechanical properties reached top standard. It was a good kind of antibacterial textile material with strong bacteriostatic and bactericidal action against Staphylococcus aureus, Escherichia coli and Candida albicans.

The micro-structural and formaldehyde adsorption abilities of pineapple leaf raw and degummed fibers are characterized by using SEM, FT-IR, chemical composition analysis and determination of acidic oxygen-containing functional groups and more other methods. Test results show that after being degummed, pineapple leaf fibers possess smoother surfaces, obvious grooves, better single-fiber separations and non-significant cross-sectional cavities. Hemicellulose’s characteristic absorption peaks disappear basically and their contents are reduced from 20.62% to 2.65%. The intensities of lignins’ characteristic absorption peaks drop and their contents are decreased from 3.68% to 1.20%. The locations of celluloses’ characteristic absorption peaks do not change too significantly and their contents are increased from 61.18% to 84.45%. The numbers of carboxyl, lactone and phenolic hydroxyl in acid oxygen-containing functional groups are reduced. Pineapple leaf raw fibers have higher formaldehyde adsorption abilities. After degumming, formaldehyde adsorption abilities of pineapple leaf fibers are similar, but all slightly lower than raw fibers.

Pineapple is widely planted as one of the four major crops in in south China. The handling of residual pineapple leaves is not a step for looking down upon after harvesting. So far, returning the residual on the filed is the popular method, compared to set the residual on fire, crushing and returning has distinct advantage on high-efficient and low-pollution. In the text, the technology and machine of crushing and returning is summarized, and the current problems is analyzed and discussed.