Block-resistant gypsum board
AssigneeNational Gypsum Company
InventorsRobert M. Johnson, Daniel A. Winkowski, Rodney A. Stiling
Life of this patent
Estimating the term…
Abstract
A predecorated printed paper on the gypsum wallboard with a clear washable coating over the printed paper, and having a thin coating of polyethylene emulsion on the back paper which overcomes the tendency of the coated predecorated paper to stick to the back paper of an adjacent board when the boards are piled in stacks for storage and shipment.
Claims5
The method of making gypsum wallboard comprising the steps of forming a set gypsum core between face paper and back paper, modifying said gypsum wallboard of set core and paper by coating said back paper with a formed-in-place thin film of polyethylene, and also modifying said gypsum wallboard of set core and paper by coating said face paper with a protective acrylic resin coating formed in place having the characteristic of tending to adhere to a back paper of an adjacent stacked wallboard if said wallboard is stacked with the resin coating adjacent plain uncoated back paper following the application of said resin coating, whereby said wallboards may be stacked face to back without causing blocking.
Dependencies are inferred from the claim text.