Multi-layer paper web and a method of forming it
AssigneeSCA Hygiene Products AB
InventorHolger Hollmark
Life of this patent
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Abstract
A method of making a multilayer paper web, wherein at least two paper sheets are formed and dried separately to a dry content of no more than 80% by weight, imparting a three-dimensional pattern of alternating raised and recessed portions in the paper sheets during drying, combining the paper sheets into a multilayer web, in which void volumes are created between the raised and recessed portions of the combined sheets and drying the multilayer web.
Claims11
A method of making a multilayer paper web, which comprises:
- separately forming and drying at least two paper sheets to a dry content of no more than 80% by weight,
- imparting a three-dimensional pattern of alternating raised and recessed portions in the paper sheets during drying,
- combining the at least two paper sheets having a dry content of no more than 80% by weight into a multilayer web, in which void volumes are created between the raised and recessed portions of the combined sheets, and
- drying the multilayer web.
A multilayer paper web having a three-dimensional structure, and comprising at least two paper sheets, each of which having a three-dimensional pattern of alternating raised and recessed portions, said paper sheets being joined together point- or spotwise by papermaking bonds forming bonding sites, while leaving void volumes between the sheets and between the bonding sites.
Dependencies are inferred from the claim text.