Plaster boards and methods for making them

A plaster board having

• a major plane,
• a first major surface and an opposing second major surface, each lying parallel to the major plane, and
• a first edge extending from the first major surface to the second major surface, and a second edge extending from the first major surface to the second major surface,
• the plaster board comprising:
• a first panel disposed at the first major surface of the plaster board, and lying parallel to the major plane the first panel having an outer surface forming the first major surface of the plaster board, an opposing inner surface, a first edge disposed at the first edge of the plaster board, a second edge disposed at the second edge of the plaster board, and a center between the first edge and the second edge;
• a second panel disposed at the second major surface of the plaster board and lying parallel to the major plane, the second panel having an outer surface forming the second major surface of the plaster board, an opposing inner surface, a first edge disposed at the first edge of the plaster board, a second edge disposed at the second edge of the plaster board, and a center between the first edge and the second edge;
• and
• a layer of hardened plaster material disposed between the first panel and the second panel, wherein the layer of hardened plaster material comprises
• a first region disposed proximate the first edge of the plaster board, the first region having a first density,
• a second region having a second density, and
• a third region disposed proximate the second edge of the plaster board, the third region having a third density,
• wherein
• the first density and the third density are each at least 110% of the second density, and
• the second region is disposed laterally between the first region and the third region along a plane parallel to the major plane.

A plaster board having

• a first major surface and an opposing second major surface, and
• a first edge extending from the first major surface to the second major surface, and a second edge extending from the first major surface to the second major surface,
• the plaster board comprising:
• a first panel disposed at the first major surface of the plaster board, the first panel having an outer surface forming the first major surface of the plaster board, an opposing inner surface, a first edge disposed at the first edge of the plaster board, a second edge disposed at the second edge of the plaster board, and a center between the first edge and the second edge;
• a second panel disposed at the second major surface of the plaster board, the second panel having an outer surface forming the second major surface of the plaster board, an opposing inner surface, a first edge disposed at the first edge of the plaster board, a second edge disposed at the second edge of the plaster board, and a center between the first edge and the second edge;
• and
• a layer of hardened plaster material disposed between the first panel and the second panel, wherein the hardened plaster material comprises
• a first region proximate the first edge of the plaster board, the first region having a first density and extending from the first panel to the second panel, and
• a second region proximate the center of the plaster board, the second region extending from the first panel to the second panel, the second region having a second density, the first density being at least 110% of the second density.