Extrusion, bleach processing

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]. 

Strong absorption of polysilanes in the UV region makes these materials suitable for application to photo (81) and X-ray lithography (82). Photo-bleaching by UV irradiation indicates scission as the major process for most polysilanes scission proceeds via silyl radical and/or silylene (R2Si ) extrusion (Fig. 9) (83). 

PVDF copolymers at <1000 ppm in typical blown film applications is effective in reducing melt fracture and allowing increased extrusion rates Chemical resistance to bleaching agents and other paper mill process chemicals... 

Highly suited for incontinence items. Thermally bonded laminates with cotton core and outer layer of MB and/or spunbonded (SB) webs process are designed by encapsulation of carded bleached cotton web with outer layers of MB PP and/or SB PP after extrusion process, prior to calendering. 

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