Mixer, mixing method, and method of producing gypsum board
- Assignee
- Yoshino Gypsum Co Ltd
- Inventors
- Wataru Nakamura, Yuichi Hirooka
- Jurisdiction
- European Patent Office
- Filed
- 2004-05-21
- Published
- 2006-03-22
- Priority
- 2004-05-21
The present invention provides a mixer and a mixing method which enable stable supply of slurry at a high flow rate with foam being uniformly mixed therein, and which enable reduction in consumption of foam to be fed to the slurry. The mixer (10) has a housing (20), a rotary disc (32), a slurry outlet port (45), a slurry delivery conduit (46) and a hollow connector section (47). A foam feeding port (41) is disposed in a predetermined position of an annular wall or the hollow connector section. The foam feeding port feeds the foam to the slurry, immediately before the slurry enters the slurry outlet port, or feeds the foam to the slurry in the hollow connector section. The slurry and the foam mix with each other at the slurry outlet port or on its downstream side. The foam is not substantially subjected to agitation impact of the mixer and a quantity of loss of the foam is reduced. The foam is uniformly mixed with the slurry even when the flow rate of slurry is increased, and therefore, the production rate of gypsum boards can be increased.
A mixer comprising a flattened and circular housing provided with an annular wall on its periphery; a rotary disc located in the housing to rotate in a predetermined rotational direction; a slurry outlet port opening on said annular wall to discharge from the housing, gypsum slurry mixed in the housing; a hollow connector section with an open end connected to said slurry outlet port and another open end connected to a substantially vertical and cylindrical slurry delivery conduit; and a foam feeding port for feeding foam to the gypsum slurry, wherein said foam feeding port is provided on the annular wall on an upstream side of the slurry outlet port in the rotational direction so as to feed the foam to the gypsum slurry immediately before the gypsum slurry enters said slurry outlet port, or provided on said hollow connector section so as to feed the foam to the gypsum slurry flowing in the hollow connector section.
Further claims, drawings, prosecution history and legal status: see the official record.
- [1]EP 1 637 302 A1 — Mixer, mixing method, and method of producing gypsum board — Google Patents · 2006-03-22