Drainage Management in Multi-Ply Papermaking
AssigneeEcolab USA Inc.
InventorsBradley Benz, Nathan Ray Jones, James W. Minner
Life of this patent
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Abstract
Methods of producing a multi-ply paper product are provided. The methods comprise applying coagulant and/or hybrid coagulant-flocculant composition to an upper ply substrate disposed adjacent and above a lower ply substrate in an amount such that a portion of the coagulant and/or the hybrid coagulant-flocculant composition passes through the upper ply substrate. Preferably, the lower ply substrate has a greater freeness than the upper ply substrate. The methods of the present disclosure preferably allow for efficient use of RDF chemicals while making use of the innate freeness differences between the upper and lower ply substrates.
Claims21
A method of treating a multi-ply paper production process comprising a lower ply substrate and an upper ply substrate disposed adjacent to and above the lower ply substrate, the lower and upper ply substrates passing through the multi-ply paper production process, the method comprising:
- applying coagulant and/or hybrid coagulant-flocculant composition to the upper ply substrate, the coagulant and the hybrid coagulant-flocculant composition each applied in an amount such that a portion of the coagulant and/or the hybrid coagulant-flocculant composition passes through the upper ply substrate and drains onto the lower ply substrate.
The method of claim 15, wherein the coagulant is organic cationic coagulant.
The method of claim 16, wherein the hybrid coagulant-flocculant composition is a cationic copolymer comprising acrylamide and at least one additional cationic mer unit selected from diallyldimethyl ammonium chloride, an allylamine, a diallylamine, a dialkylaminoalkyl acrylate quaternary salt, a dialkylaminoalkyl acrylate acid salt, a dialkylaminoalkyl methacrylate quaternary salt, a dialkylaminoalkyl methacrylate acid salt, derivatives thereof, multiples thereof, and combinations thereof.
The method of claim 16, wherein the hybrid coagulant-flocculant composition comprises from about 50 mol % to about 95 mol % acrylamide mer units.
13-14. (canceled)
Dependencies are inferred from the claim text.