Cellulose fibers bleaching process

Table 3.12 shows that the melt flow index of HDPE in the presence of 50% wood flour decreases rather significantly, from 1.6 g/10 min for salt cedar to 0.2 g/10 min in the presence of pine. Fnrthermore, if we consider the initial MFI value for the neat plastic, a drop in MFI is qnite significant. For example, a polypropylene with MFI 23 g/10 min (MFI was 29 g/10 min after processing in the extruder at 100 or 300 rpm) was loaded with 20% bleached sulfite cellulose fibers, and after extrusion at 100 rpm MFI dropped to 2 g/10 min. With 30% loading with the fiber, MFI further decreased to 0.5 g/10 min [131]. 

Cellulosic Fibers. Substantivity for cellulosic fibers is offered mainly by anionic FWAs, preferably with sulfonic acid groups. Brighteners such as 14,19, 24, and 26 with moderate to high affinities are suitable for batch processes. If simultaneous bleaching takes place in the same bath, the brightener must be stable with respect to bleaching chemicals such as peroxide or chlorite [126],... 

The bagasse fibers having brown color can treat to be white cellulose fibers as followed process [18]. Figure 19.4 shows procedure of the purification procedures including (1) lignin removal and [2] bleaching for the cellulose fibers. After the agave... 

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