Polypropylene and using Design of experimental Factorial design Response surface methodology Injection mould -The application of factorial experimental design to the processing of polypropylene fibres -Optimization of injection molding process for contour distortions of polypropylene composite components via design of experiments method -Optimization of injection molding process for contour distortions of polypropylene composite components via design of experiments method -Statistical experimental design and modeling of polypropylene-wood fiber composites -A factorial design applied to the extrusion foaming of polypropylene/woodflour composites -The influence of fiber processing parameters on the structural properties of as-spun polypropylene fibers: A factorial design approach -Studies on the effect of reactive polypropylene on the properties of filled polyolefin composites. Part 2. Optimization of product composition and mechanical properties of modified polypropylene composites