Abstract: Flax fiber was used as reinforcing material to commingle with polypropylene (PP) fiber to realize mixture at the stage of yarn, meanwhile, PP filaments were introduced to produce a core-spun yarn with flax/pp as core and PP filament as outer sheath. Commingled yarns were woven into 2-D fabrics which were used as the prefabricated materials. Composite laminates were prepared by hot press technology. Effects of manufacture technology, yarn structure and fiber weight fraction on puncture properties of composites were investigated through analyzing the puncture testing results. Testing results show that the punctuation properties of composite laminate with 68% fiber weight fracture are the best; laminate made by “sandwich” method shows better punctuation properties than “mixing” method one; punctuation properties of 0°/0° laminates are higher than that of 0°/90° laminates.

Key words: polypropylene, flax yarn, hot press, reinforement, impact property