Utilization of deinking by-product in building materials
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United States of America Patent
Stats
-
Mar 5, 1996
Grant Date -
N/A
app pub date -
Dec 29, 1993
filing date -
May 26, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Deinking by-product from wastepaper recycling operations and pulp mill clarifier sludge are incorporated into drywall or other gypsum-based building products, such as building blocks. The deinking by-product or pulp mill clarifier sludge is diluted and mixed with stucco (calcium sulfate hemihydrate). The resulting slurry preferably is subjected to an initial dewatering, following the on-set of hardening of the gypsum, and drywall or other building product is formed from the dewatered material. A significant loading of fibrous material in the drywall sheet or other gypsum product is achieved using the procedure, imparting improved flexural strength to the product. The preferred procedure also may be used to incorporate virgin or recycled wood pulp into the building product.
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Family
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Cited Art Landscape
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