Mill experience with an energy saving laminar design screen basket in the paper machine approach system

摘要

The introduction of the fine-slotted wedge wire screen basket has been a significant advance in machine screening technology. Wedge wire baskets doubled the open area compared to conventional milled screen baskets, increasing screening efficiency while enhancing screened pulp properties. Depending on the amount of impurities and floes in the paper machine approach flow, ultra narrow slots are needed to guarantee the accept pulp quality-but screening with narrow slots is a challenge. With conventional wedge wire designs, the very narrow slot size leads to a rapidly increasing pressure drop over the screen basket and a corresponding increase in pumping energy required to counteract the restriction in screening capacity.