Abstract: Method of forming building materials mostly consisting of magnesium oxide. The method comprises the steps of mixing magnesium oxide powder with at least one of vegetable powder, vegetable fiber, mineral powder, and mineral fiber in a predetermined mixing ratio to produce an admixture; adding water to the admixture to produce a wet powdered admixture; inserting the wet powdered admixture into a frame mold assembly of a molding machine consisting of a frame mold and a preheated lower mold and heating and compressing the wet powdered admixture using an upper mold and hardening the admixture; and releasing a resulting product from the molding machine. The method is advantageous in that the building materials have an excellent strength and fire retardant, do not emit a poisonous gas at all during their combustion, and can be inexpensively produced in commercial quantity because the building materials can be produced by an injection and an extrusion molding.

Abstract: A continuous moulding device for producing building materials includes two pairs of drive sprockets (22) oppositely positioned at the inlet and the outlet of the device, a pair of chain conveyors (24) wound on the drive sprockets (22), with each chain conveyor having a connecting part (24a) on each of its links. A series of bottom plates (26) are connected to opposite connecting parts (24a) of the links. Side wall members (27) are pivotably connected to the sides of each bottom plate to form a transverse unit mould, and end pieces (30, 30') are connected to each bottom plate (26) to resiliently contact the ends of the unit mould. The unit mould can also be formed by separate side wall members (127) and bottom members (128), or by integrally formed bottom walls (210a) and side walls (210b, 210c) defined by a moulding conveyor belt (210). The device is used to form moulded products such as concrete beams, door frames or aluminum blocks with a high degree of dimensional tolerances.