High-hardness filter cloth for plate and frame filter press, and production method thereof

The invention discloses a high-hardness filter cloth for a plate and frame filter press, and a production method thereof. The filter cloth is a short fiber mixed needle-punched filter cloth containinga reinforced base cloth, hot-melt bonding points are formed between short fibers, and the surface layer fibers of the filter cloth are partially melted. The production method comprises the followingsteps: the fibers are placed in an opening mixer, are opened and mixed, then are sent into a carding machine, are carded to form a net, and are cross-lapped to obtain a double-layer fiber net; the reinforced base cloth is unrolled, and enters a space between two fiber net layers; the fiber net is needled and reinforced by a needling machine to obtain a needle-punched cloth; the needle-punched cloth is sent into an oven, and undergoes hot air reinforcement; and the obtained partially-melted needle-punched cloth is sent to a hot rolling mill, and undergoes surface calendering to obtain the high-hardness filter cloth for