Abstract:

 Some flax/polypropylene(PP) thermo-plastic composites that use natural flax fiber as reinforcing material,polypropylene as resin,flat-knitting fabrics with different volume fractions and structures as the pre-pregnant,were studied in the present work.And they were hot-pressed into the friendly-environment technical textile composites.The superior composites structures and processing technology were obtained by analyzing the properties of the flax and polypropylene,designing and analyzing the parameters and processing technology to the knitted pre-pregnant and the composites matrix.The results revealed that the flax/PP knitted pre-pregnant could be processed simply and efficiently,and it could be hot-pressed directly.So the composites with lowercost was developed.In the hot-pressing process,the best pressure was 10MPa with the pre-pregnant of four or six layers and 15MPa with the pre-pregnant of eight layers.

Key words: flax fiber, polypropylene, knitting fabric, pre-pregnant, thermo-plastic composites