Plasterboards and methods for making them

A method of forming a plasterboard,

• the method comprising:
• loading an extruder with a moldable material;
• providing a first liner having a first surface and a second surface and a second liner having a first surface and a second surface;
• extruding the moldable material through a die to form a layer of moldable material having a first surface disposed against the second surface of the first liner;
• molding a surface relief comprising a plurality of raised features on the second surface of the layer of moldable material to provide a layer of molded material;
• and thereafter,
• contacting first surface of the first liner with a layer of wet plaster material, such that the second surface of the first liner faces away from the layer of wet plaster material;
• contacting the first surface of the second liner with the layer of wet plaster material, such that the second surface of the second liner faces away from the layer of wet plaster material;
• and thereafter
• drying the layer of wet plaster material to form the layer of hardened plaster material, the method resulting in a plasterboard comprising
• the layer of hardened plaster material, having a first surface and an opposed second surface;
• the first liner, the first surface of the first liner contacting the first surface of the layer of hardened plaster;
• the second liner, the first surface of the second liner contacting the second surface of the layer of hardened plaster;
• and
• the layer of molded material, the first surface of the layer of molded material being disposed against the second surface of the first liner, the second surface of the layer of molded material facing away from the layer of hardened plaster material, the second surface of the layer of molded material having the surface relief comprising the plurality of raised features, the plurality of raised features occupying at least 30% of a surface area of the second surface of the layer of molded material.