Gypsum construction sheet with glass fiber/non-woven felt lining sheet

• US 4,504,533 A
• Filed: 05/29/1984
• Issued: 03/12/1985
• Est. Priority Date: 03/29/1980
• Status: Expired due to Term

• Current Assignee: Gebr. Knauf Westdeutsche Gipswerke
• Original Assignee: Gebr. Knauf Westdeutsche Gipswerke
• Inventors: Altenhofer, Herbert, Neuhauser, Gerhard, Wintzheimer, Engelbert
• Primary Examiner(s): McCamish, Marion E.
• Application Number:
  US06/614,703
• Time in Patent Office: 287 Days
• Field of Search: 428/70, 428/74, 428/77, 428/126, 428/127, 428/128, 428/129, 428/130, 428/193, 428/194, 428/236, 428/251, 428/285, 428/703
• US Class Current: 428/70
• CPC Class Codes: E04C 2/043 of plaster E04C2/049 takes precedence
• CPC Class Codes: Y10T 428/232 Encased layer derived from inorganic settable ingredient
• CPC Class Codes: Y10T 428/237 Noninterengaged fibered material encased [e.g., mat, batt, etc.]
• CPC Class Codes: Y10T 428/24231 At opposed marginal edges
• CPC Class Codes: Y10T 428/2424 Annular cover
• CPC Class Codes: Y10T 428/24248 One piece
• CPC Class Codes: Y10T 428/24256 Abutted or lapped seam
• CPC Class Codes: Y10T 428/24264 Particular fold structure [e.g., beveled, etc.]
• CPC Class Codes: Y10T 428/24785 including layer embodying mechanically interengaged strands, strand portions or strand-like strips [e.g., weave, knit, etc.]
• CPC Class Codes: Y10T 428/24793 Comprising discontinuous or differential impregnation or bond

Abstract

The invention concerns a gypsum construction board in which a gypsum core is faced with a two-layer laminate comprised of a nonwoven fiber felt and a glass fiber web of crossed glass fibers wherein the glass fiber web of crossed glass fibers is embedded in the gypsum core and the laminate is in the form of a laminate sheet which extends across the width of the board.

Claims

1. A gypsum construction board comprising a gypsum core formed by application of a water paste like slurry of a mixture of calcined gypsum, water and operational additive on a gypsum-free, dry lower lining sheet folded over upward around longitudinal edges of said core on which is placed a narrower upper gypsum-free, dry lining sheet having margins overlapping the margins of the lower lining sheet, both margins being bonded adhesively and said upper and lower lining being a two-layer laminate of an inner glass fiber web and an outer non-woven fiber felt, said web being embedded in the gypsum core over the width of the board and the glass fiber web of the lower lining sheet being omitted at folded-over sides and edges.

2. A gypsum construction board according to claim 1, wherein the glass fiber web of the upper lining sheet is omitted at the adhesively bonded margins.