公开(公告)号：US12157975B2

公开(公告)日：2024-12-03

申请号：US17910344

申请日：2021-04-09

Applicant: ANDRITZ INC.

Inventor： Ralph Prescott ,  Jay Shands

IPC: D21G9/00 ,  D21F1/02

Abstract: A method for controlling a slice flow of a slurry having two or more component slurries through a headbox for a paper making machine includes, inputting a wire speed of the paper making machine; determining a jet velocity setpoint based on the wire speed; determining a header pressure setpoint for two or more headers to generate the jet velocity determined by the jet velocity setpoint, each header providing one of the two or more component slurries to the headbox; and controlling the slice flow by: generating a first speed command to a first slurry pump to generate a header pressure determined by the header pressure setpoint in a first header; and generating a second speed command to a second slurry pump to generate the header pressure determined by the header pressure setpoint in a second header.

公开(公告)号：US20230160144A1

公开(公告)日：2023-05-25

申请号：US17910344

申请日：2021-04-09

Applicant: ANDRITZ INC

Inventor： Ralph Prescott ,  Jay Shands

IPC: D21G9/00 ,  D21F1/02

CPC classification number: D21G9/0018 ,  D21F1/02

Abstract: A method for controlling a slice flow of a slurry having two or more component slurries through a headbox for a paper making machine includes, inputting a wire speed of the paper making machine; determining a jet velocity setpoint based on the wire speed; determining a header pressure setpoint for two or more headers to generate the jet velocity determined by the jet velocity setpoint, each header providing one of the two or more component slurries to the headbox; and controlling the slice flow by: generating a first speed command to a first slurry pump to generate a header pressure determined by the header pressure setpoint in a first header; and generating a second speed command to a second slurry pump to generate the header pressure determined by the header pressure setpoint in a second header.