EP0189311A1 - Procédé pour contrôler la formation d'une bande de matière - Google Patents

Procédé pour contrôler la formation d'une bande de matière Download PDF

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Publication number
EP0189311A1
EP0189311A1 EP86300405A EP86300405A EP0189311A1 EP 0189311 A1 EP0189311 A1 EP 0189311A1 EP 86300405 A EP86300405 A EP 86300405A EP 86300405 A EP86300405 A EP 86300405A EP 0189311 A1 EP0189311 A1 EP 0189311A1
Authority
EP
European Patent Office
Prior art keywords
actuators
thickness
regulating member
slice
slice lip
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.)
Granted
Application number
EP86300405A
Other languages
German (de)
English (en)
Other versions
EP0189311B1 (fr
Inventor
Gurcan Aral
Ramesh Balakrishnan
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.)
Honeywell Measurex Corp
Original Assignee
Measurex 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 Measurex Corp filed Critical Measurex Corp
Publication of EP0189311A1 publication Critical patent/EP0189311A1/fr
Application granted granted Critical
Publication of EP0189311B1 publication Critical patent/EP0189311B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/02—Methods of beating; Beaters of the Hollander type
    • D21D1/06—Bed plates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section

Definitions

  • the present invention concerns a system and process for controlling the formation of sheet materials such as paper.
  • Various sheet materials are manufactured by causing the material in a fluid state to flow in a controlled fashion onto a conveyer or the like.
  • sheet plastic is often manufactured by extruding heated plastic through a die onto a conveyer belt.
  • paper is often manufactured by causing a slurry of paper pulp to flow from a headbox onto a moving wire.
  • a thickness-regulating member is normally used to insure that the thickness of the sheet is substantially uniform both in the direction in which the sheet travels and in the direction perpendicular thereto.
  • the thickness regulating member is called a slice lip and in the case of plastics material, the thickness regulating member may be called a die.
  • the position of the thickness-regulating member is controlled by actuators, which in the case of paper manufacturing include slice rods.
  • U. S. Patent 3,413,192 teaches a system for controlling a thickness regulating member used in the manufacture of sheet products.
  • a water slurry of fibrous paper stock is fed into a headbox, and the slurry then flows through a slice lip opening slot to be deposited in a continuous web onto a Fourdrinier wire which is continuously moving in a direction away from the headbox.
  • the position of the slice lip is controlled by a plurality of actuators connected to the slice lip and to the headbox and spaced apart from one another along the length of the slice lip.
  • the paper slurry dries as it travels along the Fourdrinier wire and thereafter the paper web is fed between press rolls for removal of additional moisture. The web is then fed through a drier section, and the finished paper web issues from the drier. After the dried paper leaves the drier, a conventional basis weight measuring gauge including a source of nuclear radiation is used to measure the thickness of the web across the width thereof. Information from the measuring gauge is transmitted to a control system which in turn controls the slice actuators to maintain the thickness of the paper being produced according to a predetermined scheme.
  • An object of the present invention is to provide a system and process for controlling a thickness regulating member wherein the physical characteristics of the thickness regulating member are taken into consideration prior to using the system to control the manufacture of a sheet material.
  • the present embodiment includes a headbox 10 to contain paper pulp.
  • the headbox 10 includes a plurality of control members 12 coupled to a slice lip 14. Below the slice lip 14 is located the slice opening 16 through which the paper pulp is distributed onto a moving Fourdrinier wire 20.
  • the sheet of paper 22 is processed in a drier 24 and then rolled for shipment onto a reel 26.
  • a scanner 30 is positioned across the sheet 22 near the reel 26.
  • the scanner 30 is conventional and will not be described in detail herein.
  • the scanner has two gauges, a basis weight gauge 32 and a moisture gauge 34, which move back and forth across the moving sheet and simultaneously measure the basis weight and moisture of the sheet.
  • the gauges 32 and 34 produce electrical signals corresponding to the measured property of the sheet, and the electrical signals are transmitted to a controller 36.
  • the controller 36 includes a computer to process information received from the gauges 32 and 34, and the controller also includes means coupled to the control members 12 to control the operation thereof.
  • FIG. 2 shows details of the control members 12.
  • Each member 12 includes a support tube 40 which is connected to the side of the headbox 10 by mounting brackets 42.
  • a screw jack 44 is coupled to the upper end of the support tube 40, and a knob 46 is coupled to the upper end of the screw 44.
  • To the lower end of the screw jack 44 is coupled a slice rod or actuator 45 which includes a heating element, not shown.
  • the slice rod 45 is hollow, and the heating element extends substantially the full length of the interior of slice rod 45.
  • the heating element is a pair of elec- rically insulated wires so that when current is applied the wires heat thereby heating the slice rod.
  • a wire pair 51 is coupled to the heating element and extends out of the tube 40 for coupling to a power source.
  • Each connector 50 has a threaded hole, not shown, formed therein to accept a slice rod 45, and the rods 45 are threaded at their lower ends to permit the rods to be.screwed into the connectors 50.
  • Each connector 50 has a mounting member 54 formed on .its lower end to cooperate with the slice lip 14.
  • the slice lip 14 extends the length of the headbox and has a substantially flat side which fits flush against the front wall of the headbox 10.
  • the opposing side of the slice lip 14 is curved and has a notch 56 to cooperate with the mounting member 54 so that vertical movements of a connector 50 results in corresponding vertical movement of the portion of the slice lip to which the connector is coupled.
  • Behind the slice lip 14 the front face of the headbox 10 has a slice opening 16 to permit pulp to flow from the headbox onto the wire above a forming board 60.
  • the shape of the lower edge of the slice lip 14 determines the configuration of the flow of pulp from the slice opening 16.
  • the slice rods or actuators 45 can be used to control the basis weight of the paper measured by the gauge 32.
  • control of the actuators can advantageously be based upon certain information which is predetermined prior to operation of the system.
  • n the number of actuators coupled to the slice lip.
  • Each of the above matrices is derived by modelling the slice lip as an elastic beam supported by elastic supports and loaded at the actuators. Such systems are well analyzed in mechanical and civil engineering disciplines, and various approximations are well known..
  • the slice rods 45 are relatively thin and flexible. This allows for a reasonable assumption that the rods apply forces only, and the torques exerted by the rods are negligible.
  • the behavior of the slice lip segments between two adjacent actuators can be expressed in terms of moments acting at the two ends of each segment.
  • the neighboring ends of two adjacent segments must assure the continuity of the slice lip, and hence the positions and slopes at the neighboring ends must equal each other. This way one can express (n-1) relations, where (n) is the number of rods along the slice lip and where 1 is the distance between rods, as,
  • the matrices R a , A, P a and D a are based upon the assumptions of equal spacing between the rods; all force on the slice lip is acting at the rods; and all rods are identical. In the event that any or all of these assumptions is not satisfied, different matrices could be computed. However, as a practical matter, we have found that the above-identified matrices would be applicable to most practical cases.
  • matrices A and R a have been determined then certain physical parameters of the system must be determined also. In particular, the following must be determined based upon a physical experiments or information from the manufacturer of the equipment.
  • Z a vector of the required slice rod movements
  • Y a vector of required displacements of the thickness regulator member at each actuator
  • J the identity matrix and the other variables are as discussed above.
  • the required slice rod movements are a function of the required displacements and physical parameters of the system, i.e.:
  • an operator in the field can utilize the following procedure to develop a parameter c, which can be used in place of the parameters identified above.
  • a parameter c which can be used in place of the parameters identified above.
  • a series of curves have been developed showing rod number versus displacement of the slice lip when a single rod, for example, rod 10 is moved in one direction. Tests have shown that if the parameter c is a certain value, say Cl, and rod 10 is displaced a distance X1 then the slice lip in the area adjacent the rod 10 will be displaced as shown on the curve Cl.
  • actuators are likewise applicable to other types of actuators.
  • plastic extruders and other sheet material processes employing actuators of the type taught herein or actuators which are hydraulically powered or motor driven are appropriate for application of the present invention.
EP86300405A 1985-01-22 1986-01-21 Procédé pour contrôler la formation d'une bande de matière Expired - Lifetime EP0189311B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69392085A 1985-01-22 1985-01-22
US693920 1991-04-29

Publications (2)

Publication Number Publication Date
EP0189311A1 true EP0189311A1 (fr) 1986-07-30
EP0189311B1 EP0189311B1 (fr) 1990-04-25

Family

ID=24786675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86300405A Expired - Lifetime EP0189311B1 (fr) 1985-01-22 1986-01-21 Procédé pour contrôler la formation d'une bande de matière

Country Status (7)

Country Link
EP (1) EP0189311B1 (fr)
JP (1) JPH086275B2 (fr)
KR (1) KR930003326B1 (fr)
CA (1) CA1303706C (fr)
DE (1) DE3670659D1 (fr)
FI (1) FI88941C (fr)
IE (1) IE57152B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3808050A1 (de) * 1988-03-11 1989-09-21 Escher Wyss Gmbh Vorrichtung zum einstellen einer blendenklinge
WO1989011561A1 (fr) * 1988-05-17 1989-11-30 J.M. Voith Ag Caisse de tete pour machines a papier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041486A1 (fr) * 1980-06-02 1981-12-09 Svenska Träforskningsinstitutet Dispositif de contrôle pour bande de papier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6026877B2 (ja) * 1977-04-27 1985-06-26 石川島播磨重工業株式会社 スライスリツプの計算機による制御方法
JPS56107094A (en) * 1980-01-25 1981-08-25 Mitsubishi Heavy Ind Ltd Slice lip control apparatus of paper making machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041486A1 (fr) * 1980-06-02 1981-12-09 Svenska Träforskningsinstitutet Dispositif de contrôle pour bande de papier

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TAPPI JOURNAL, vol. 67, no. 12, December 1984, pages 52-55, Atlanta, Georgia, US; S.J. SILER: "Cross-machine basis-weight control: machine considerations" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3808050A1 (de) * 1988-03-11 1989-09-21 Escher Wyss Gmbh Vorrichtung zum einstellen einer blendenklinge
US4915789A (en) * 1988-03-11 1990-04-10 Sulzer-Escher Wyss Gmbh Apparatus for adjusting a diaphragm blade
WO1989011561A1 (fr) * 1988-05-17 1989-11-30 J.M. Voith Ag Caisse de tete pour machines a papier

Also Published As

Publication number Publication date
DE3670659D1 (de) 1990-05-31
JPS61225392A (ja) 1986-10-07
FI860272A (fi) 1986-07-23
FI88941B (fi) 1993-04-15
IE57152B1 (en) 1992-05-06
FI860272A0 (fi) 1986-01-21
EP0189311B1 (fr) 1990-04-25
FI88941C (fi) 1993-07-26
KR930003326B1 (ko) 1993-04-26
CA1303706C (fr) 1992-06-16
KR860005932A (ko) 1986-08-16
IE860181L (en) 1986-07-22
JPH086275B2 (ja) 1996-01-24

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