METHOD FOR MANUFACTURING A FIBROUS WEB

The invention relates to a method for manufacturing a fibrous web， such as web of paper， board， tissue or the like. The method comprises forming an aqueous fibre suspension comprising cellulosic fibres from one or more raw material flows， and applying at least one chemical and/or physical control measure to the aqueous fibre suspension or at least one of its raw material flows for control of microbial activity in the aqueous fibre suspension or the raw material flow before an inlet of an intermediate residence entity， such as storage tower or broke tower， which has a delay time of at least one hour， preferably at least two hours. In this manner a starting ORP value for the aqueous fibre suspension is obtained. The aqueous fibre suspension in the intermediate residence entity at least the minimum delay time， and a final ORP value is measured for the aqueous fibre suspension after an outlet of the said intermediate residence entity but before the formation of the fibrous web. An ORP difference value between the starting ORP and final ORP values is calculated， and if the ORP difference value exceeds a pre-determined threshold value， then adjusting the applied chemical and/or physical control measure(s) until the ORP difference value falls below the pre-determined threshold value. Finally， the aqueous fibre suspension is formed into a fibrous web and dried. The invention relates to a method for manufacturing a fibrous web， such as web of paper， board， tissue or the like. The method comprises forming an aqueous fibre suspension comprising cellulosic fibres from one or more raw material flows， and applying at least one chemical and/or physical control measure to the aqueous fibre suspension or at least one of its raw material flows for control of microbial activity in the aqueous fibre suspension or the raw material flow before an inlet of an intermediate residence entity， such as storage tower or broke tower， which has a delay time of at least one hour， preferably at least two hours. In this manner a starting ORP value for the aqueous fibre suspension is obtained. The aqueous fibre suspension in the intermediate residence entity at least the minimum delay time， and a final ORP value is measured for the aqueous fibre suspension after an outlet of the said intermediate residence entity but before the formation of the fibrous web. An ORP difference value between the starting ORP and final ORP values is calculated， and if the ORP difference value exceeds a pre-determined threshold value， then adjusting the applied chemical and/or physical control measure(s) until the ORP difference value falls below the pre-determined threshold value. Finally， the aqueous fibre suspension is formed into a fibrous web and dried.

搜集汇总

背景与挑战

背景概述

该数据集描述了一种制造纤维网（如纸、板或纸巾）的方法，涉及形成含纤维素纤维的水性悬浮液，并通过化学或物理措施控制微生物活动。方法包括测量和调整悬浮液的氧化还原电位差异，以确保在形成纤维网前达到预定的阈值。