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).
Claims20
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 stock flow, and
- mixing the at least one additional stock component with the equalized stock flow.
An approach flow system of a fiber machine headbox comprising:
- a headbox feed pump;
- a headbox screen;
- a chemical mixer;
- a headbox feed pipe, wherein a stock flow passage extends through the headbox feed pump, the headbox screen, the chemical mixer and the headbox feed pipe, and
- a stock flow equalizer included in the stock flow passage and configured to equalize consistency differences prevailing in a stock flow in the stock flow passage, and the stock flow equalizer is between the headbox screen and the headbox and is upstream of the chemical mixer in the stock flow passage.
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;
- mixing an additional stock component into the flow of stock upstream of the headbox downstream in the flow of stock from the equalizing consistency differences, and
- directing the flow of stock with the additional stock component through the headbox pipe and into the headbox.
Dependencies are inferred from the claim text.