Process for the production of paper or paperboard
AssigneeStora Enso AB
InventorJan-Erik Nordstrom
Life of this patent
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Abstract
The present invention relates to a process for producing a paper or paperboard product which process comprises the steps of providing a first headbox with a furnish comprising fibres, which furnish forms at least one layer of the paper or paperboard product, providing the headbox with a non-fibrous high consistency composition, which composition forms at least one additional layer of the paper or paperboard product and conducting the layers onto a wire forming a multilayer web which is further dewatered and dried forming the paper or paperboard product. The invention further relates to a paper or paperboard produced according to the process and a headbox used in the process.
Claims15
A process for producing a multilayer paper or paperboard product, which process comprises:
- providing a first headbox with a furnish comprising fibres, which furnish forms at least one layer of the paper or paperboard product,
- providing the first headbox with a non-fibrous high consistency composition with a dry solids content of 5-70% by weight, which composition forms at least one additional layer of the paper or paperboard product, and
- conducting the layers onto at least one wire forming a multilayer web which is further dewatered and dried to form the paper or paperboard product.
The process according to claim wherein the content of the non-fibrous high consistency composition is 10-80% by weight of the total content of the paper or paperboard product.
The process according to claim wherein the non-fibrous high consistency composition is a coating colour.
A multilayer headbox comprising
- at least one first inlet channel adapted to receive furnish comprising fibres,
- at least one turbulence generator connected to the first inlet channel,
- a second inlet channel adapted to receive a non-fibrous high consistency composition,
- a sliced cone connected to the turbulence generator and the second inlet channel,
- wherein the first inlet channel and the turbulence generator are arranged so that the furnish is passed through the first inlet channel and further to the turbulence generator and thereafter to the sliced cone, and
- wherein the second inlet channel is arranged so that the non-fibrous high consistency composition is passed through the second inlet channel and directly to the sliced cone without being subjected to any turbulence.
Dependencies are inferred from the claim text.