The invention relates to a method for manufacturing a composite board, in particular to a method for manufacturing a fibrilia /
polypropylene fiber composite board. The invention aims at solving the problems that the fibrilia /
polypropylene fiber composite board can not be manufactured by the existing
extrusion molding process, and various defects in the existing
hot pressing technology for manufacturing the fibrilia /
polypropylene fiber composite board, such as the difficulty for evenly mixing raw materials, lowered material performance, small the proportion of the
plant fiber material and increased cost. The method comprises the following steps: firstly, entwisting the rough
flax fiber into long lines to obtain flax ropes; secondly,
carding a polypropylene lacerated film long stripe into a
filament yarn to obtain polypropylene silk
yarn; and thirdly, weaving the flax ropes and the polypropylene silk
yarn into pieces, performing
hot pressing to the pieces after being covered by a steel plate, taking out together with the steel plate after pressure relief, and putting the pieces to a cold press for cooling and molding to obtain the fibrilia /
polypropylene fiber composite board. In the invention, the dispersible uniformity of the
raw material is good, the performance enhanced effect of the board is good, the highest proportion of the
plant fiber material in the product is 90 percent,the consumption of polypropylene is reduced, and the production cost is reduced.