Powder compression molding method and apparatus and dry cell

摘要

A compression molding method for producing powder mixture pellets for an alkaline-manganese dry cell. A powder mixture (P) is supplied into a die (3) under a state that a center pin (4) is located lower than the top surface of the die (3), after which the center pin (4) is lifted up to a given molding position where an annular molding space is defined between the center pin (4) and the die (3), in which the powder mixture (P) is compressed from upper and lower sides with an upper plunger (6) and a lower plunger (5) to form a pellet (13). Then, the center pin (4) and the lower plunger (5) are unitedly lifted up to push the pellet (13) out of the die (3) to be removed from the center pin (4). Pellets which are uniform in weight and height can be thereby stably molded, and the molded pellets can be taken out from the die (3) with a small amount of force.