Powder blender high intensity

Table 11.16 shows the composition of a PVDF blend for foam fabrication. This recipe was mixed in an intensive power blender to produce a homogeneous powder blend which was then melt blended in a high shear twin screw extruder at 200 rpm and a temperature of 200°C. Pellets were produced by extruding the melt into water and chopping the quenched extrudate. The foamable blend was extruded, through a 25 mm extruder, according to the conditions given in Table 11.17. A comparison of the properties of foamed and solid PVDF wire insulation is presented in Table 11.18.

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