Method of and an arrangement for adding at least one additional stock component to an approach flow system of a fiber web machine
AssigneesWetend Technologies Oy, Valmet Technologies Oy
InventorsAntti Ketolainen, Jouni Matula, Leif Piippola
Life of this patent
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Abstract
A method of and an arrangement for adding at least one additional stock component to an approach flow system (30) of a fiber web machine by mixing the at least one additional stock component to a fibrous stock such that the stock flow is equalized (50) and the at least one additional stock component is introduced to the stock flow by injection mixing (80).
Claims15
A method of adding at least one additional stock component to a stock flow in an approach flow system of a fiber web machine headbox, wherein a fibrous stock is introduced by a headbox feed pump via a headbox screen, a headbox feed pipe and a chemical mixer to the headbox of a fiber web machine, the method comprises:
- treating the stock flow by equalizing consistency differences prevailing in the stock flow downstream of the headbox screen to form an equalized but not dampened stock flow, and
- after treating the stock flow to form the equalized but not dampened stock flow, mixing the at least one additional stock component with the already equalized but not dampened stock flow.
A method comprising:
- pumping a flow of stock of a suspension of fibers through a headbox pipe;
- screening the flow of stock in a headbox screen connected to the headbox pipe;
- equalizing consistency differences in the flow of stock downstream of the headbox screen and upstream of a headbox to form an equalized and turbulent flow of stock, wherein the equalizing consistency differences is performed without dampening the flow of stock;
- after the step of equalizing consistency differences, mixing an additional stock component into the equalized and turbulent flow of stock upstream of the headbox and downstream in the flow of stock from the equalizing consistency differences, and
- directing the equalized and turbulent flow of stock with the additional stock component through the headbox pipe and into the headbox.
A method comprising:
- screening the flow of stock in a headbox screen;
- equalizing consistency differences in the flow of stock by creating turbulence in the flow of stock downstream of the headbox screen and upstream of a headbox, wherein the turbulence forms an equalized flow of stock, wherein the equalizing consistency differences is performed without dampening the flow of stock;
- mixing an additional stock component into the equalized flow of stock upstream of the headbox and after the step of equalizing consistency differences, and
- after the step of mixing the additional stock component, directing the equalized flow of stock with the additional stock component into the headbox.
Dependencies are inferred from the claim text.