Use of metal chelates as a surface application for abrasion and/or taber stiffness, improvement in paper and paperboard
AssigneeKemira Oyj
InventorGeorge Gordon Bugg
Life of this patent
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Abstract
The embodiments of the present invention generally relate to i) paper and paperboard or molded products with improved abrasion resistance and/or taber stiffness, ii) methods for making paper and paperboard or molded products with improved abrasion resistance and/or taber stiffness, and iii) methods for improving abrasion resistance and/or taber stiffness paper and paperboard or molded products, by using a metal chelate, such as, Ammonium Zirconium Carbonate (AZC) or Potassium Zirconium Carbonate (PZC). Further advantages of the embodiments of the present invention will be readily apparent to the reader from this disclosure.
Claims11
A method for improving resistance to bending of a multilayered fibrous product, the method comprising:
- providing an aqueous fiber stock,
- forming the fiber stock into two or more wet fibrous webs, wherein the wet fibrous webs are joined together to obtain a wet multilayered fibrous product;
- and
- drying the wet multilayered fibrous product such that
- at least one surface of the wet fibrous webs has a solids content of 15-65 weight-%;
- and treating the at least one surface of the wet fibrous webs being joined with an aqueous zirconium chelate solution, by applying the aqueous zirconium chelate solution on the surface in amount of 0.05-2 lb solids/1000 square feet, wherein the treatment is conducted between the layers to be joined to thereby enhance a fiber to fibre bonding at the at least one surface through forming bonds with —OH groups on fibres.
Dependencies are inferred from the claim text.