Apparatus for preparing a gypsum wallboard core

Details Apparatus for preparing a gypsum wallboard core Apparatus for preparing a gypsum wallboard core

2007-02-06

2007-02-06

Davis, Robert (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

Including product handling means

C425S131500, C425S445000, C425S00400R, C425S376100, C425S131100, C425S133500, C425S462000, C425S466000, C264S177200, C264S211000, C264S075000, C156S041000

Reexamination Certificate

active

10707761

ABSTRACT:
A gypsum wallboard core, and methods and apparatus for making the same are disclosed. Methods of making a gypsum wallboard core include extruding a gypsum slurry containing water, gypsum, slip agents, water-reducing agents, surfactants and, optional additives, through a die and onto a substantially flat, smooth, moving surface. The die has provisions at its outer sides for the introduction of slip agents into the slurry, and provisions at its lateral outer edges for the introduction of a strength-enhancing agent. Once extruded onto the conveyor belt, the slurry is chemically-activated to set and form a hardened board core which then may be easily removed from the conveyor belt and dried.

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