Method for an Arrangement at a Paper Machine

摘要

The present invention relates to a method for reducing the spreading of additional agent(s) which is/are introduced into the process at a papermaking machine. A flowable paper pulp including fibres and a process liquid and having a consistency of not more than 10% is conducted towards the paper machine's headbox ( 5 ). Prior to the introduction ( 14 ) of said additional agent the consistency of the pulp is increased to a value higher than 10% by removing ( 8 ) process liquid and conducting ( 11 ) it in the upstream direction, while compensating process liquid is introduced ( 13 ) downstream. The present invention also relates to an arrangement at a paper machine, where separating means ( 8 ) are arranged in the process direction before means ( 14 ) for introducing additional agent (s). The arrangement further includes means ( 11 ) for conveying process liquid separated from the process in an upstream direction in the process, as well as means ( 13 ) for a downstream introduction of process liquid from a short circulation in order to compensate for the separated process liquid.