Doctor control systems for papermaking machines and related methods

Patent metadata

Field	Value
Publication number	US-9873981-B2
Application number	US-201615209806-A
Country	US
Kind code	B2
Filing date	Jul 14, 2016
Priority date	Jul 16, 2015
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A papermaking machine includes a Yankee dryer, a doctor, and a doctor blade loading control system. The doctor blade loading control system includes a first doctor loading cylinder coupled to the doctor and configured to selectively apply a loading force to the doctor, a second doctor loading cylinder coupled to the doctor and configured to selectively apply a loading force to the doctor, a first air line in communication with the first doctor loading cylinder, a second air line in communication with the second doctor loading cylinder, a first electronic pressure controller configured to control a loading pressure of the first doctor loading cylinder on the doctor based on a first loading pressure setpoint, and a second electronic pressure controller configured to control a loading pressure of the second doctor loading cylinder on the doctor based on a second loading pressure setpoint.

First claim

We claim:

1. A papermaking machine for manufacturing a paper product, the papermaking machine comprising:
a Yankee dryer configured to rotate about an axis thereof;
a doctor positioned about the Yankee dryer, the doctor comprising a doctor blade supported by a doctor blade holder; and
a doctor blade loading control system in communication with the doctor, the doctor blade loading control system comprising:
a first doctor loading cylinder coupled to a tend side of the doctor and configured to selectively apply a loading force to the doctor;
a second doctor loading cylinder coupled to a drive side of the doctor and configured to selectively apply a loading force to the doctor;
a first air line in communication with a load side of the first doctor loading cylinder and configured to deliver air thereto;
a second air line in communication with a load side of the second doctor loading cylinder and configured to deliver air thereto;
a first electronic pressure controller disposed along the first air line and configured to control a loading pressure of the first doctor loading cylinder on the doctor based on a first loading pressure setpoint, wherein the first electronic pressure controller is configured to control a first pressure of the air delivered to the load side of the first doctor loading cylinder; and
a second electronic pressure controller disposed along the second air line and configured to control a loading pressure of the second doctor loading cylinder on the doctor based on a second loading pressure setpoint, wherein the second electronic pressure controller is configured to control a second pressure of the air delivered to the load side of the second doctor loading cylinder.

2. The papermaking machine of claim 1 , further comprising:
a system controller in communication with the first electronic pressure controller and the second electronic pressure controller; and
a user interface in communication with the system controller.

3. The papermaking machine of claim 2 , wherein the user interface comprises:
a first hand indicating controller configured to adjust and indicate the first loading pressure setpoint; and
a second hand indicating controller configured to adjust and indicate the second loading pressure setpoint.

4. The papermaking machine of claim 3 , wherein the user interface further comprises:
a first pressure indicator configured to indicate the loading pressure of the first doctor loading cylinder on the doctor; and
a second pressure indicator configured to indicate the loading pressure of the second doctor loading cylinder on the doctor.

5. The papermaking machine of claim 2 , wherein the doctor blade loading control system further comprises an electronic solenoid valve in communication with the first air line and the second air line and configured to control air flow thereto, and wherein the electronic solenoid valve is positioned upstream of the first electronic pressure controller and the second electronic pressure controller.

6. The papermaking machine of claim 5 , wherein the electronic solenoid valve is in communication with the system controller, and wherein the user interface comprises a hand switch configured to open and close the electronic solenoid valve.

7. The papermaking machine of claim 2 , further comprising a doctor blade vibration monitoring system in communication with the doctor, the doctor blade vibration monitoring system comprising:
an accelerometer mounted to the doctor and configured to measure or detect vibration of the doctor blade and to generate and send a vibration signal; and
a vibration transmitter in communication with the accelerometer and configured to receive the vibration signal therefrom.

8. The papermaking machine of claim 7 , wherein the vibration transmitter is in communication with the system controller and configured to send the vibration signal thereto, and wherein the user interface comprises a vibration indicator configured to indicate the vibration of the doctor blade.

9. The papermaking machine of claim 7 , wherein the vibration transmitter is in communication with the system controller and configured to send the vibration signal thereto, and wherein the system controller is configured to automatically adjust the first loading pressure setpoint and the second loading pressure setpoint based on the vibration of the doctor blade.

10. The papermaking machine of claim 1 , wherein the doctor is a creping doctor, and wherein the doctor blade is a creping doctor blade configured to remove a fibrous web from the Yankee dryer and to crepe the fibrous web.

11. The papermaking machine of claim 1 , wherein the doctor is a cleaning doctor, and wherein the doctor blade is a cleaning doctor blade configured to remove a portion of a coating from the Yankee dryer.

12. The papermaking machine of claim 1 , wherein the doctor is a cut-off doctor, and wherein the doctor blade is a cut-off doctor blade configured to remove a fibrous web from the Yankee dryer and redirect the fibrous web.

13. A papermaking machine for manufacturing a paper product, the papermaking machine comprising:
a Yankee dryer configured to rotate about an axis thereof;
a doctor positioned about the Yankee dryer, the doctor comprising a doctor blade supported by a doctor blade holder;
a doctor blade loading control system in communication with the doctor, the doctor blade loading control system comprising:
a first doctor loading cylinder coupled to the doctor and configured to selectively apply a loading force to the doctor;
a first air line in communication with a load side of the first doctor loading cylinder and configured to deliver air thereto; and
a first electronic pressure controller configured to control a loading pressure of the first doctor loading cylinder on the doctor based on a first loading pressure setpoint;

a doctor blade vibration monitoring system in communication with the doctor, the doctor blade vibration monitoring system comprising:
a first accelerometer mounted to the doctor and configured to measure or detect vibration of the doctor blade and to generate and send a first vibration signal; and
a first vibration transmitter in communication with the first accelerometer and configured to receive the first vibration signal therefrom; and

a system controller in communication with the first electronic pressure controller and the first vibration transmitter, wherein the system controller is configured to receive the first vibration signal from the first vibration transmitter and to automatically adjust the first loading pressure setpoint based on the vibration of the doctor blade.

14. The papermaking machine of claim 13 , wherein the first electronic pressure controller is disposed along the first air line and configured to control a first pressure of the air delivered to the load side of the first doctor loading cylinder.

15. The papermaking machine of claim 13 , further comprising a user interface in communication with the system controller, the user interface comprising:
a hand indicating controller configured to adjust and indicate the first loading pressure setpoint;
a pressure indicator configured to indicate the loading pressure of the first doctor loading cylinder on the doctor; and
a vibration indicator configured to indicate the vibration of the doctor blade.

16. The papermaking machine of claim 13 , wherein the doctor blade loading control system further comprises:
a second doctor loading cylinder coupled to the doctor and configured to selectively apply a loading force to the doctor;
a second air line in communi

Assignees

• Gpcp Ip Holdings Llc

Inventors

• Edbauer Mitchell S
• Bons Ross C
• Haines Jason A
• Thomson Scott M

Classifications

• D21F11/14

  Making cellulose wadding, filter or blotting paper · CPC title

• D21G3/005 Primary

  Doctor knifes · CPC title

• D21G3/04

  for drying cylinders · CPC title