Abstract: A pressurizing pre-impregnating die head for a fiber reinforced plastic sheet machine is provided. The die head includes a body; at least one group of fiber channels arranged in a longitudinal hole-through manner in a middle of the body, and a fiber yarn conveyed in the fiber channel. The body includes a feeding port and discharging ports, which communicate with each other. The discharging ports are located in outer sides of the fiber channel. Thermoplastic base materials in a molten state are paved on two sides of the fiber yarn. The thermoplastic base materials may be paved on surfaces of the two sides of the fiber yarn when being extruded.

Abstract: A pressurizing pre-impregnating die head for a fiber reinforced plastic sheet machine is provided. The die head includes a body; at least one group of fiber channels arranged in a longitudinal hole-through manner in a middle of the body, and a fiber yarn conveyed in the fiber channel. The body includes a feeding port and discharging ports, which communicate with each other. The discharging ports are located in outer sides of the fiber channel. Thermoplastic base materials in a molten state are paved on two sides of the fiber yarn. The thermoplastic base materials may be paved on surfaces of the two sides of the fiber yarn when being extruded.

Abstract: A method for making large-size hollow ceramic plate (1, 2, 4) adopts raw materials of ordinary ceramics, mixing with industrial wastes or crude minerals abundant in period IV transition metal elements, squeezing a molded body by vacuum squeezing machine then producing at low cost a large-size hollow ceramic plate (1, 2, 4) with black or fuscous surface or whole body, with an area more than 0.5m2 of a single plate. A large-size hollow ceramic plate array (23) is composed of porous ceramic plates (1), through-hole ceramic plates (2) and accessories by gluing or thread-connecting or is composed of seal ceramic plates (4) by series connecting, which can be used in a solar water heater, a solar roof and wall, a generator with large-scale solar wind duct, a large-area solar collector, a far infrared radiation plate and a radiator for construction.