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AssigneeMetso Paper, Inc.
InventorsLassi Minkkinen, Harri Tahti
Estimating the term…
The invention relates to an arrangement for controlling the edge of pulp mass in a web former, the web former comprising a space formed by two wires or the like, into which space the pulp mass is fed. The wires or the like are supported on a chamber units, which each time include at least one chamber for receiving the water removed from the pulp mass. In conjunction with the side edge of the said web former are arranged pulp mass edge control means, which include an edge sealing part. The edge sealing part extends, in the lateral direction of the web former, by a distance between the chamber units in such a way that it will prevent the pulp mass edge from passing and/or spreading in the lateral direction of the web former into the area of the said edge of the web former. The invention also relates to a method for controlling the pulp mass edge in a web former.
An arrangement for controlling the edge of pulp mass (M) in a web former (1), the web former (1) comprising a space (5) formed by two wires (3, 4) or the like, into which space the pulp mass (M) is fed, the wires (3, 4) or the like being supported on chamber units (6, 7), which each time include at least one chamber (8) for receiving the water removed from the pulp mass (M), and in conjunction with the side edge (17) of the said web former (1) there being arranged pulp mass (M) edge control means (11, 12) for preventing the pulp mass (M) edge from passing and/or spreading in the lateral direction of the web former (1) into the area of the side edge (17) of the web former (1), said edge control means (11, 12) including means for feeding pressurised injection water (B) into the area of the side edge (17) of the web former, characterised in that the side edge (17) control means (11, 12) of the web former (1) include an edge sealing part (11) which extends, in the lateral direction of the web former (1), by a distance between the chamber units (6, 7), that in the edge sealing part (11) are formed channels (13, 14a, 14b, 14c, 16), through which the pressurised injection water (B) can be fed between the chamber units (6, 7) and the surfaces (11a, 11b) of the edge sealing part (11).
A method for controlling the edge of pulp mass (M) in a web former (1), in which method the pulp mass (M) is fed into a space (5) formed by two wires (3, 4), the wires (3, 4) or the like being supported on chamber units (6, 7), which each time include at least one chamber for receiving the water removed from the pulp mass (M), and in conjunction with the side edge (17) of the said web former (1) there being arranged pulp mass (M) edge control means (11, 12) for preventing the pulp mass (M) edge from passing and/or spreading in the lateral direction of the web former (1) into the area of the side edge (17) of the web former (1), in which method pressurised injection water (B) is fed into the area of the side edge (17) of the web former (1), characterised in that the said passing and/or spreading of the pulp mass (M) is prevented by means of an edge sealing part (11) comprised in the side edge control means (11, 12) of the web former (1), which edge sealing part (11) extends, in the lateral direction of the web former (1), by a distance between the chamber units (6, 7), and by feeding the pressurised injection water (B) between the chamber units (6, 7) and the surfaces (11a, 11b) of the edge sealing part (11) through channels (13, 14a, 14b, 14c, 16) formed in the edge sealing part (11).
Dependencies are inferred from the claim text.