Metso Paper Inc.

Jarmo Kirvesmäki

Janne Lappi

Ilkka Kemiläinen

Hannu Turpeinen

A vane intended for a headbox of a paper machine or equivalent is moistened and enclosed in a vapor-proof package to ensure the straightness of the vane. At least a portion of the vane is made of a water-absorbing material, such as plastic or a composite. Advantageously, the vane contains moisture in an amount that corresponds to the equilibrium moisture content of the vane in headbox conditions. It is enclosed in a package, preferably a vacuum package, which retains the moisture of the vane until the vane is put into use.

Vane intended for a headbox of a paper machine and method for ensuring the straightness of a vane

A headbox apparatus of a paper machine or equivalent has a body (). Dilution water (arrow L) is conducted through at least two rows of ducts (aa. . . ) into each body mixing chambers (aa. . . ). Each mixing chamber (aa. . . ) is limited by vertical walls (T), a bottom wall (T) and a covering wall (T), and a partition wall (aa. . . ). The ducts (aa. . . ) on the inlet side of the mixing chamber extend into the mixing chamber (aa. . . ) at a distance (h) from the ducts (aaa. . . ) on the outlet side of the mixing chamber (aa. . . ), whereby an annular gap (D) is left between the aligned duct (aaaa. . . ) on the inlet side and the duct (aaaa. . . ) on the outlet side. Each mixing chamber (aa. . . ) is filled by dilution water which is conducted through the annular gap (D) to join the stock (m).

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Jyväskylä, Finland

Jarmo Kirvesmäki