Method for the adjustment of the dewatering in the wire section of a paper machine
AssigneeTamfelt Oy Ab
InventorM. Juhani Salovaara
Life of this patent
Estimating the term…
Abstract
A method and apparatus are provided for the adjustment of the dewatering in the wire section of a paper machine. A fiber web is fed on to a forming wire, and the forming wire is passed over the surface of at least one dewatering means and a partial vacuum dependent on the difference in the speeds of the wire and said surface is created under the forming wire. An additional movable wire is positioned to move between the forming wire and the dewatering means and the dewatering is adjusted according to the kind of the fibre web to be dewatered, by adjusting the speed of the additional wire independently of the speed of the forming wire.
Claims4
A method for adjustment of dewatering in a wire section of a paper machine, comprising the steps of:
- feeding a fiber web onto a forming wire moved over at least one dewatering means;
- passing the forming wire over the surface of said at least one dewatering means so that a partial vacuum effecting the dewatering is thereby created under the forming wire, the partial vacuum being dependent on the relative speed between the forming wire and said surface;
- providing an additional moving wire whose path of travel passes between the forming wire and the surface of said dewatering means, said additional moving wire being provided such that it moves relative to the forming wire and said surface of the dewatering means;
- and
- adjusting the speed of the additional wire independently of the speed of the forming wire such that the speed of the additional moving wire is different from the speed of the forming wire and such that the partial vacuum and hence the dewatering is thereby adjusted.
Dependencies are inferred from the claim text.