The FLD-series high-concentration pulp-extruding machine, was researched and developed by our company in light of our experience and actual situations within China's pulping industry, papermaking industry, food industry and also brewing industry. This machine is the ideal equipment for enterprises to manufacture and extract raw black liquor. To be more specific, this kind of machine is mainly used for extracting the braised wood pulp, bamboo pulp and the residue of various straws, and for concentrating the pulp of the recycled waste paper. And it has been proved by clinical trial that this machine will satisfy the requirements of high concentration and environmental protection for extracting black liquor.