Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1993-12-29
1996-03-05
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
162189, 162DIG9, 106650, 106651, 106653, 106654, 156 39, D21H 1701
Patent
active
054964415
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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Chin Peter
Tran Industrial Research Inc.
LandOfFree
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