MIXER, MIXING METHOD, AND METHOD OF PRODUCING GYPSUM BOARD

摘要

A mixer and a mixing method, where the mixer is capable of stably feeding a large flow rate of slurry in which bubbles are uniformly mixed and capable o f reducing the amount of bubbles to be fed to the slurry. A mixer (10) has a housing (20), a rotating board (32), a slurry outlet (45), a slurry feed tub e (46), and a hollow connection portion (47). A bubble feed opening (41) is provided at a predetermined position in an annular wall or in the hollow connection portion and feeds bubbles to slurry immediately before flowing in to the slurry outlet or in slurry in the hollow connection portion. The slurry and bubbles are mixed at the slurry outlet or on the downstream side of the slurry outlet. The bubbles are substantially not subjected to a mixing impac t of the mixer and the amount of bubbles disappear is reduced. The bubbles are uniformly mixed into the slurry even when a slurry flow rate is increased, s o that a production speed of gypsum boards can be increased.