| 摘要 |
[Problem] To prevent unevenness, deviation, or variation in the density distribution of gypsum slurry on a base paper for a gypsum board by reducing the swirling of the gypsum slurry which flows onto the base paper for a gypsum board. [Solution] A mixing and stirring device (10) for gypsum slurry has a circular housing (20) for forming a kneading region, and also has a rotating plate (32) disposed within the housing. The mixing and stirring device (10) further has a pipe passage (50, 90, 95, 96, 97, 97') for supplying slurry onto base paper (1) for a gypsum board. A chute has flow passage portions (60, 61, 91, 92) which are provided with flow passage cross-sections asymmetric with respect to the center axis (C, C1) of the pipe passage, or alternatively, the chute has flow passage portions (98, 99) in which the position of the center axis of the pipe passage is changed by changing or displacing the flow passage cross-sections. An axially symmetrical swirling flow which is generated as an in-pipe swirling flow (F) within the pipe passage collapses in the flow passage portions, and as a result, the gypsum slurry (3) flowing out onto the base paper for a gypsum board substantially does not flow in a swirling motion which causes the non-uniformity or instability of density distribution. |
