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US 6,656,324 B2Granted
Method for removing wax from a pulp furnish
AssigneeWeyerhaeuser Company
InventorSusan A. Freeland
Life of this patent
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Abstract
A method for removing wax from a pulp furnish is disclosed. The method is effective for removing wax from a pulp furnish containing waxed old corrugated containers (OCC). In the method, the pulp furnish containing waxed OCC is treated with an agglomeration chemical which separates wax from the fibers and agglomerates the wax for removal by screening. In a preferred embodiment, the pulp furnish is treated with a caustic material to enhance wax removal.
Claims17
A method for removing wax from a pulp furnish, comprising:
- adding an agglomeration chemical combination comprising d-limonene and sodium metasilicate to a pulp furnish comprising fibers and wax, wherein the agglomeration chemical combination is added in an amount effective to separate wax from the fibers to provide a resulting furnish comprising wax particles and fibers substantially free from wax, wherein the pulp furnish is maintained at a temperature below the wax melting point;
- and
- screening the resulting furnish to separate the wax particles to provide a pulp furnish substantially free from wax.
A method for removing wax from a pulp furnish, comprising:
- adding an agglomeration chemical combination comprising d-limonene and sodium metasilicate to a pulp furnish comprising a caustic material, fibers and wax, wherein the agglomeration chemical combination is added in an amount effective to separate wax from the fibers to provide a resulting furnish comprising wax particles and fibers substantially free from wax, wherein the pulp furnish is maintained at a temperature below the wax melting point;
- and
- screening the resulting furnish to separate the wax particles to provide a pulp furnish substantially free from wax.
Dependencies are inferred from the claim text.