Patent ID: 8590272
Filing Date: 2013-11-26
Classification: B32B,E04B,Y10T

Abstract:
1. A fire door comprising: a first external door facing layer comprising a gypsum fiberboard and a second external door facing layer comprising a gypsum fiberboard; at least one internal door core layer disposed between the first and the second external door layers, wherein the internal door core comprises a gypsum panel board; a first adhesive layer disposed between the first external door facing layer and the internal door core, wherein the first adhesive layer comprises a viscoelastic hot melt adhesive and forms a discontinuous pattern providing isolated uncoated sealed spaces to cover only a first portion of the internal door core; and a second adhesive layer disposed between the second external door facing layer and the internal door core, wherein the second adhesive layer comprises a viscoelastic hot melt adhesive and forms a discontinuous pattern providing isolated uncoated sealed spaces to cover only a second portion of the internal door core on a side opposite the first adhesive layer, and; wherein the first portion of the internal core and the second portion of the internal core are offset from one another such that no portion of the first adhesive layer aligns with a portion of the second adhesive layer.