The Polyvinyl-chloride (PVC) composites filled with micro-Calcium Carbonate (CaCO 3), submicro-CaCO 3 , nano-CaCO 3 and nano-coating micron CaCO 3 powder were prepared by the method of melt blending process. The tensile properties of the PVC/CaCO 3 composites were tested at the room temperature. The interfacial adhesion strength between the CaCO 3 particle and the PVC matrix was measured. The results showed that the tensile properties of the PVC/CaCO 3 composites were better than those of the pure PVC in the most conditions; the mechanical properties of the surface treated CaCO 3 filled PVC composites were better than the ones of the non-surface treated CaCO 3 filled PVC composites. The mechanical properties of the PVC composites filled with nano-coating micron heavy CaCO 3 were better than the ones of the he PVC composites filled with heavy CaCO 3 ; among the four types of CaCO 3 , the mechanical properties of the PVC composites filled common light CaCO 3 and ultra-fine light CaCO 3 were relatively better; as the interfacial interaction strength, the strength between the ultra-fine light CaCO 3 and the PVC matrix was maximum, the one between the common light CaCO 3 and the PVC matrix was minimum, the strength between the nano-coating micron heavy CaCO 3 and the matrix was bigger than that between the micron heavy CaCO 3 and the matrix, the strength between the CaCO 3 after being treated and the matrix was increased.

The wood biomass with certain moisture content prepared by spraying artificially was pulverized by universal mill, cutting mill and the cage mill with the drying and transporting gas. The morphological characteristics of powder of the wood biomass with different moisture content were investigated by the scanning electrical microscope (SEM). The results indicated that particles of woody biomass pulverized by the cutting mill were flank and their cross sections of breakage were neatly, the breakage cross sections of those pulverized by the universal mill were rough, and the morphology of the particles of the woody product pulverized by cage mill was smooth, rounded, and their inner structure was deformed. When the moisture content was 0%, the specific energy consumption of the cutting mill, the cage mill and the universal mill was 47.00, 120.99 and 158.48 kWh/t, respectively; as the moisture content was 20%, the specific energy consumption of the cutting mill, the cage mill and the universal mill was 90.76, 255.47, 213.53 kWh/t, respectively.