Gypsum wallboard
AssigneeUnited States Gypsum Company
InventorWilliam J. Long
Life of this patent
Estimating the term…
Abstract
A specially prepared paper bond liner, gypsum wallboard, and gypsum wallboard process which bonds the liner to the core by an adhesive confined to the paper-core interface, the adhesive comprising certain starches placed on the bond liner in their raw state.
Claims6
In a panel comprising a rehydrated gypsum core securely bonded to a paper cover sheet by a starch adhesive disposed at the interface of said core and said cover sheet, the improvement wherein said starch adhesive is nonmigratory and is disposed at limited areas of said interface, the amount of starch present at said limited areas being sufficient to provide secure bonding of said paper cover sheet to said gypsum core when said starch adhesive has set, and wherein substantial areas of said interface are free of said starch adhesive, said free areas being sufficient to provide wet bonding of said cover sheet to said core prior to the setting of said starch adhesive, the portion of said paper cover sheet spaced from said interface being substantially free of starch.
Dependencies are inferred from the claim text.