Patent ID: 8877010

Claim:
An apparatus for use in connection with a paper machine, comprising at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to: receive, at a moment T 1 , from a sensor, information on a distribution of at least one determined property of a sample of liquid fibre pulp, which is used for manufacturing an end product, as a function of at least two different particle sizes fractionated by a fractionator utilizing hydrodynamic flow resistance of particles, wherein the end product is one of paper, paperboard and board and wherein the sample is taken from the liquid fibre pulp which is to be conveyed into a headbox of the paper machine or has proceeded into the headbox; receive, at a moment of time T 2 that is later than the moment of time T 1 , from a sensor, information on at least one determined property of the end product; generate a model based on the determined at least one property of the end product and the distribution of at least one property of the sample of the liquid fibre pulp as a function of at least two different particle sizes, wherein the model connects the property of the end product received at the moment of time T 2 to the distribution of the property of the sample of the liquid fibre pulp received at the moment of time T 1 ; receive, at a moment of time T 3 that is later than the moment of time T 2 , from a sensor, information on a distribution of at least one determined property of the sample of the liquid fibre pulp, which is used for manufacturing the end product, as a function of at least two different particle sizes fractionated by a fractionator utilizing hydrodynamic flow resistance of particles; model, at a moment of time T 4 which is later than the moment of time T 3 , the at least one property of the end product on the basis of the generated model when the distribution of at least one property of the sample at the moment of time T 3 is known; receive information on at least one desired property of the end product, upon detecting that the modeled at least one property of the end product and the at least one desired property of the end product do not match, perform the following: control, on the basis of the generated model, components before the headbox of the paper machine such that the distribution of the at least one property of the liquid fibre pulp in the headbox as a function of different particle sizes is such that it produces the at least one desired property of the end product.