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US 6,648,965 B2Granted
Fire door components and fire doors comprising the components
AssigneeG-P Gypsum Corporation
InventorDonald F. Klus
Life of this patent
Estimating the term…
Abstract
Structural components for a fire door comprising a core and edge banding and other structural components, the components comprising gypsum, expanded perlite, and cement, and having a density between about 60 and 80 lbs./ft.3. Also, a method by which the structural components are made and a fire door comprising the components.
Claims20
A structural component of a fire door comprising the press-molded set product of an aqueous mixture comprising:
- a) based on the total weight of dry ingredients,
- 1) about 60 to about 80 wt. % of calcined gypsum;
- 2) about 3 to about 12 wt. % of expanded perlite fines;
- 3) about 1.5 to about 7.5 wt. % of fibrous material;
- 4) about 4 to about 10 wt. % of an organic binder;
- and
- 5) about 3 to about 18 wt. % of shrinkage reduction agent;
- and
- b) water in a quantity sufficient to form a damp mixture.
6 more elements
A dry mix for manufacturing a structural component of a fire door, said mix comprising, based on the total weight of dry ingredients,
- a) about 60 to about 80 wt. % of calcined gypsum;
- b) about 3 to about 12 wt. % of expanded perlite fine;
- c) about 1.5 to about 7.5 wt. % of fibrous material;
- d) about 4 to about 10 wt. % of an organic binder;
- and
- e) about 3 to about 18 wt. % of shrinkage reduction agent.
3 more elements
A method for manufacturing a fire door comprising:
- a) press molding a damp mixture comprising,
- (1) based on the total weight of the dry ingredients,
- i) about 60 to about 80 wt. % of calcined gypsum;
- ii) about 3 to about 12 wt. % of expanded perlite fines;
- iii) about 1.5 to about 7.5 wt. % of fibrous material;
- iv) about 4 to about 10 wt. % of an organic binder;
- and
- v) about 3 to about 18 wt. % of shrinkage reduction agent;
- and
- (2) water in a quantity sufficient to form the damp mixture, to form structural components having a green strength sufficient to be shape-retaining;
- (b) placing structural components into desired locations of a mold for a fire door;
- and
- (c) introducing fire door core material into the mold to form a fire door.
10 more elements
Dependencies are inferred from the claim text.