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US 9,752,280 B2Granted
Arrangement for and a method of manufacturing a fibrous web
AssigneesValmet Technologies Oy, Wetend Technologies Oy
InventorJouni Matula
Life of this patent
Estimating the term…
Abstract
A method to form a fibrous web including: introducing a furnish to a headbox of a fiber web machine, wherein the furnish includes a thick stock component and a filtrate, injecting a gas into to the furnish to form a foamed furnish, and laying the foamed furnish on a wire or between wires of a wire section of the fiber web machine to form the fibrous web from the foamed furnish.
Claims10
An arrangement for manufacturing a fibrous web, the arrangement comprising:
- means for preparing furnish of at least one of a thick stock component and a filtrate,
- means for delivering the furnish toward a headbox of a fiber web machine, and
- a headbox feed pipe comprising an injection mixing station configured to introduce and mix gas into the furnish to form a foamed furnish.
An arrangement for manufacturing a fibrous web, the arrangement comprising:
- a short circulation flow circuit including a headbox screen, a headbox, a headbox feed pipe between the headbox screen and the headbox, and a wire section downstream of the headbox, wherein the short circulation flow circuit is configured such that a mixture of furnish and water drained from the wire section flows sequentially through the headbox screen, headbox feed pipe and the headbox to the wire section, and
- an injection mixing station connected to the headbox feed pipe and configured to introduce and mix gas into the mixture of furnish and water flowing through the headbox feed pipe to convert the mixture from an unfoamed phase to a foamed phase.
An arrangement for manufacturing a fibrous web, the arrangement comprising:
- means for preparing furnish of at least one of a thick stock component and a filtrate,
- means for delivering the furnish toward a headbox of a fiber web machine,
- a headbox feed pipe comprising an injection mixing station configured to introduce and mix gas into the furnish to form a foamed furnish, wherein the injection mixing station is located between a headbox screen and the headbox.
Dependencies are inferred from the claim text.