GB1404147A - Control of fibrous sheet making machines - Google Patents

Control of fibrous sheet making machines

Info

Publication number
GB1404147A
GB1404147A GB3755871A GB3755871A GB1404147A GB 1404147 A GB1404147 A GB 1404147A GB 3755871 A GB3755871 A GB 3755871A GB 3755871 A GB3755871 A GB 3755871A GB 1404147 A GB1404147 A GB 1404147A
Authority
GB
United Kingdom
Prior art keywords
machine
dryer
speed
control
moisture content
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3755871A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industrial Nucleonics Corp
Original Assignee
Industrial Nucleonics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Industrial Nucleonics Corp filed Critical Industrial Nucleonics Corp
Priority to GB3755871A priority Critical patent/GB1404147A/en
Priority to CA149,020A priority patent/CA964748A/en
Priority to JP8033072A priority patent/JPS4835104A/ja
Publication of GB1404147A publication Critical patent/GB1404147A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/06—Regulating pulp flow
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0036—Paper-making control systems controlling the press or drying section
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D22/00—Control of humidity
    • G05D22/02—Control of humidity characterised by the use of electric means

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Evolutionary Computation (AREA)
  • Medical Informatics (AREA)
  • Software Systems (AREA)
  • Paper (AREA)

Abstract

1404147 Automatic control INDUSTRIAL NUCLEONICS CORP 10 Aug 1972 [10 Aug 1971] 37558/71 Heading G3R In a fibrous sheet making machine, where the sheet basis weight is normally controlled by the material flow and the sheet moisture content by the machine dryer system, the speed of the machine is increased by a ramp signal until the dryer reaches an operating limit, when the sheet basis weight is controlled by the material flow and machine speed, and the moisture content by the machine speed. As shown, material is fed through a flow control valve 18 to a papermaking machine having a Fourdinier machine 10, a first dryer 12, a rewet or coating operation 16, a second dryer 14 and calendering and reeling apparatus 16. Under normal conditions, P1 controllers 82, 84 control the steam to dryer 12, and the opening of valve 18, according to the sheet moisture content and basis weight as measured by sensors 86, 88 at the output of dryer 12. Similarly dryer 14, which is optional is controlled by the moisture content and basis weight as measured by sensors 112, 110. provided certain machine parameters e.g. beater chest level are within set limits, a signal from controller 98 ramps up at set time intervals to increase the reference signal to speed control 26, which regulates the speed of the machine drive 22 using a motor speed feedback from tachogenerator 24. The speed increases until dryer logic 108 detects that one of the steam control valves 28 or 64, 66 to dryers 12 or 14 is fully opened for a preset time, determined by a counter counting the ramp-up time intervals. Under these conditions controllers 94, 96 take over to open steam valves 28, 64, 66 fully, and regulate the moisture content and basis weight by control of the machine speed and material flow. The machine speed correction may be limited to a predetermined value. Controllers 82, 84 resume control upon selection of a ramp down push-button 114. Flow charts for the dryer logic 108 are also disclosed.
GB3755871A 1971-08-10 1971-08-10 Control of fibrous sheet making machines Expired GB1404147A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB3755871A GB1404147A (en) 1971-08-10 1971-08-10 Control of fibrous sheet making machines
CA149,020A CA964748A (en) 1971-08-10 1972-08-09 Speed optimization control for fibrous sheet making machines such as paper making machines
JP8033072A JPS4835104A (en) 1971-08-10 1972-08-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3755871A GB1404147A (en) 1971-08-10 1971-08-10 Control of fibrous sheet making machines

Publications (1)

Publication Number Publication Date
GB1404147A true GB1404147A (en) 1975-08-28

Family

ID=10397372

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3755871A Expired GB1404147A (en) 1971-08-10 1971-08-10 Control of fibrous sheet making machines

Country Status (1)

Country Link
GB (1) GB1404147A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2506357A1 (en) * 1981-05-25 1982-11-26 Asea Ab DEVICE FOR ADJUSTING GRAMMING IN PAPER MACHINES
WO2000034578A1 (en) * 1998-12-04 2000-06-15 Metso Paper Automation Oy Method for executing grade change on a paper machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2506357A1 (en) * 1981-05-25 1982-11-26 Asea Ab DEVICE FOR ADJUSTING GRAMMING IN PAPER MACHINES
WO2000034578A1 (en) * 1998-12-04 2000-06-15 Metso Paper Automation Oy Method for executing grade change on a paper machine

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee