Process for making expansion joint material
AssigneeThe Celotex Corporation
InventorsWilliam E. Betzner, Fred L. Migliorini
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Abstract
A process of producing an asphalt-impregnated fiberboard comprises the steps of forming an aqueous slurry of a fibrous material and asphalt, the solids content of the slurry being less than about 8 weight percent, mixing the slurry to uniformly distribute its components, dewatering the slurry to form a wet mat, pressing the wet mat to consolidate it, and drying the consolidated wet mat. Fiberboards made by the process can be employed as durable resilient expansion joints between various types of structural members.
Claims24
A process of producing an asphalt-impregnated fiberboard comprising:
- (a) forming an aqueous slurry of (i) a fibrous material and (ii) asphalt, the solids content of the slurry being less than about 8 weight percent, the asphalt being included in the slurry in an amount of about 30 to 50% by weight solids, and optionally up to about 15% by weight solids being asphalt incorporated in the aqueous slurry in the form of an emulsion,
- (b) mixing the slurry to uniformly distribute components (i) and (ii) contained therein,
- (c) dewatering the slurry to form a wet mat of the components, the dewatering being accomplished by continuously dewatering the aqueous slurry on a moving porous carrier capable of passing drainable water therethrough and retaining solids thereon,
- (d) pressing the wet mat to consolidate it, and
- (e) drying the consolidated wet mat, with the proviso that the process includes no hot pressing of the dried consolidated mat formed by step (e).
A process of producing an asphalt-impregnated fiberboard comprising about 30 to 50% by weight of asphalt and at least about 40% by weight by fibrous material which comprises:
- (a) adding the asphalt and fibrous material to water to form an aqueous slurry, the solids content of the slurry being less than about 8 weight percent, the asphalt being added in a solid or liquid state without conversion from either physical state to the other immediately before incorporation in the water, and optionally up to about 15% by weight solids being asphalt incorporated in the aqueous slurry in the form of an emulsion,
- (b) mixing the slurry to uniformly distribute the components contained therein,
- (c) dewatering the slurry to form a wet mat of the components, the dewatering being accomplished by continuously dewatering the aqueous slurry on a moving porous carrier capable of passing drainable water therethrough and retaining solids thereon,
- (d) pressing the wet mat to consolidate it, and
- (e) drying the consolidated wet mat, with the proviso that the process includes no hot pressing of the dried consolidated mat formed by step (e).
A process of producing an asphalt-impregnated fiberboard consisting essentially of:
- (a) forming an aqueous slurry of (i) a fibrous material and (ii) asphalt, the solids content of the slurry being less than about 8 weight percent, the asphalt being included in the slurry in an amount of about 30 to 50% by weight solids, and optionally up to about 15% by weight solids being asphalt incorporated in the aqueous slurry in the form of an emulsion,
- (b) mixing the slurry to uniformly distribute components (i) and (ii) contained therein,
- (c) dewatering the slurry to form a wet mat of the components,
- (d) pressing the wet mat to consolidate it, and
- (e) drying the consolidated wet mat.
Dependencies are inferred from the claim text.