Patent ID: 7758725
Filing Date: 2010-07-20
Classification: B01F,D21H,Y10T

Abstract:
1. A method of mixing a paper making chemical into a fiber suspension flow for supplying a headbox of a paper machine, wherein the method comprises: (a) supplying a headbox of a paper machine with a fiber suspension flow within a supply conduit in a supply flow direction and at a first flow speed, (b) supplying a chemical liquid to be introduced into the fiber suspension flow, (c) bringing the chemical liquid and a fiber-containing feeding liquid into contact with each other within a mixing apparatus to form a mixture of the chemical liquid and the fiber-containing feeding liquid, (d) accelerating either the fiber-containing feeding liquid before step (c) or the mixture of the chemical liquid and the fiber-containing feeding liquid within the mixing apparatus after step (c) to a second flow speed which is at least three times greater than the first flow speed of the fiber suspension flow, and (e) discharging the mixture of the chemical liquid and the fiber-containing feeding liquid from the mixing apparatus into the fiber suspension flow at the second flow speed and in a direction which is substantially transverse to the supply flow direction.