US3468756A - Paper machine head box support - Google Patents

Paper machine head box support Download PDF

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Publication number
US3468756A
US3468756A US537834A US3468756DA US3468756A US 3468756 A US3468756 A US 3468756A US 537834 A US537834 A US 537834A US 3468756D A US3468756D A US 3468756DA US 3468756 A US3468756 A US 3468756A
Authority
US
United States
Prior art keywords
supporting beam
head box
paper machine
lower lip
channel
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 - Lifetime
Application number
US537834A
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English (en)
Inventor
Tapio Villa
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.)
Valmet Montreal Inc
Original Assignee
Valmet Oy
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 Valmet Oy filed Critical Valmet Oy
Application granted granted Critical
Publication of US3468756A publication Critical patent/US3468756A/en
Assigned to VALMET-DOMINION INC., A COMPANY OF CANADA reassignment VALMET-DOMINION INC., A COMPANY OF CANADA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VALMET OY
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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/283—With means to control or modify temperature of apparatus or work
    • Y10T83/293—Of tool

Definitions

  • a support for a paper machine head has a box beam the top side of which carries the lower lip of the machine cutter, the beam being provided with means, such as a channel or channels for a heating medium, producing temperature dilferences in the beam as the result of which the top surface of the beam and the lower lip are maintained in a straight and horizontal position.
  • This invention relates to a method and device for compensating the deflection of the lower lip in the head box cutter of a paper machine.
  • Within the head box prevails a pressure which tends to cause deflection of the structional parts of this box.
  • the pressure within the head box becomes so great that the same will cause harmful deflection of the lower lip of the head box cutter specifically.
  • the downward deflection of the lower lip of the head box cutter must be compensated for.
  • the supporting beam under the lower lip has heretofore been supported only at both ends thereof to the frame of the machine. Insofar as this beam is supported from three points, huge additional forces would be formed to load the frame and the harmful deflection of the lower lip would still not be adequately compensated for.
  • the object of this invention is to eliminate the downward deflection of the lower lip in the head box cutter of a paper machine.
  • a characteristic feature of the method according to the invention is that the top part of the supporting beam under the lower lip in a head box cutter is heated and/or the bottom part of the same beam is cooled. When the top side of the supporting beam is warmer than its bottom side it will follow that the supporting beam and the lower lip will curve upwards on account of different thermal expansions. Hence, the supporting beam will tend to bend itself in the direction opposite to that that the pressure exerted upon the supporting beam by the head box tends to deflect the same.
  • the deflection in the supporting beam and the thereto adjoining lower lip, caused by the pressure in the head box is compensated for in full. Because the deflection caused by the head box pressure in the supporting beam can be determined in advance the temperature difference between the top and the bottom sides of the supporting beam causing the total compensation of the deflection by the head box pressure can be calculated.
  • the temperatures of the top and the bottom sides of the supporting beam can be measured continuously and the supporting beam can be provided with automatic controls with which a certain predetermined temperature difference can be maintained. Heating of the top side of the supporting beam can be done by any suitable means as for instance fluid, gas or steam or electricity.
  • Cooling the bottom side of the supporting beam can be done with any suitable means as for instance with fluid or gas. If, for some reason or another it is not desired to totally compensate the deflection of the supporting beam or if it is desired Ice to deflect the same upwards from the middle this can, of course, be achieved by making the temperature difference between the top and the bottom sides of the supporting beam smaller or greater than that difference needed for compensating in full the said deflection.
  • FIGURE 1 is an end view of the head box of a paper machine, sectioned to show the supporting beam.
  • FIGURE 2 illustrates the supporting beam shown in FIGURE 1 as sectioned along line H-II of FIGURE 1.
  • FIGURE 3 is a vertical sectional view along the length of a supporting beam according to another embodiment of the invention.
  • FIGURE 4 shows a vertical sectional view along the length of a supporting beam according to a third embodiment.
  • FIGURE 5 shows a fourth embodiment of the supporting beam also in vertical sectional view.
  • the head box supporting beam 1 carries on its top side the lower lip 2 of the cutter and has its two ends supported on the machine frame 3.
  • the supporting beam is hollow and is rectangular in crosssection.
  • a channel 4 extending from end to end and of width equal to the hollow within the beam. Through this channel flows warm fluid, gas or liquid, so that the upper side of the supporting beam is heated.
  • the bottom side of the supporting beam has a channel 5 similar to the one on the top surface and through this channel flows fluid liquid or gas, for cooling the said bottom side.
  • the supporting beam shown in FIGURE 3 differs from the hereinabove described only in that only the bottom side of the supporting beam 1 is provided with a channel 5 similar to the one upon the aforedescribed supporting beam 1. Through this channel 5 flows fluid, liquid or gas, for cooling the bottom side of the supporting beam. The temperature of the top side of the supporting beam is not changed in this embodiment.
  • the supporting beam 1 shown in FIGURE 4 lacks channels, both on its top side and on its bottom side. In this case the bottom side of the supporting beam is cooled by means of a jet pipe 5 under the bottom side.
  • the supporting beam shown in FIGURE 5 carries upon its top side a channel 4 similar to the one on the supporting beam shown in FIGURES 1 and 2 but lacks a channel on its bottom side. Warm fluid medium, liquid or gas, flows through channel 4 for heating the top side of the supporting beam.
  • a support consisting of an elongated box beam having a bottom portion supported at two ends by said foundation and a top portion supporting said lower lip, said box beam comprising at least one channel for a flowing heat exchanging medium to maintain a temperature difference between said top and bottom portions and thereby counteracting pressure exerted upon the lower lip by the head and maintaining said top portion and said lower lip straight and horizontal during operation.
  • a support in accordance with claim 1 having a channel located in said top portion and another channel located in said bottom portion, each of said two channels extending between the two ends of the box beam.

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  • Paper (AREA)
US537834A 1965-04-08 1966-03-28 Paper machine head box support Expired - Lifetime US3468756A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI0859/65A FI42662B (enrdf_load_stackoverflow) 1965-04-08 1965-04-08

Publications (1)

Publication Number Publication Date
US3468756A true US3468756A (en) 1969-09-23

Family

ID=8504758

Family Applications (1)

Application Number Title Priority Date Filing Date
US537834A Expired - Lifetime US3468756A (en) 1965-04-08 1966-03-28 Paper machine head box support

Country Status (5)

Country Link
US (1) US3468756A (enrdf_load_stackoverflow)
DE (1) DE1511240A1 (enrdf_load_stackoverflow)
FI (1) FI42662B (enrdf_load_stackoverflow)
GB (1) GB1112134A (enrdf_load_stackoverflow)
SE (1) SE315195B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734822A (en) * 1970-10-16 1973-05-22 Black Clawson Co Headbox for vertical double-wire paper machine
US3769154A (en) * 1969-12-13 1973-10-30 Voith Gmbh J M Pressurized chambers for controlling deflection of papermaking machine headbox walls
US3977938A (en) * 1973-05-21 1976-08-31 Dominion Engineering Works, Limited Support beam for the rectifier section of a headbox
US4539073A (en) * 1981-12-01 1985-09-03 Kmw Aktiebolag Method and apparatus for measuring the size of a discharge slot in a headbox
US4539074A (en) * 1983-05-27 1985-09-03 Kmw Aktiebolag Method and apparatus for detecting and counteracting a deformation of the stock discharge gap in a headbox of a paper machine
US4552619A (en) * 1983-05-11 1985-11-12 A. Ahlstrom Osakeyhtio Thermal stabilizing system for a headbox of a papermachine
DE3613509A1 (de) * 1985-11-22 1987-05-27 Escher Wyss Gmbh Vorderwand am stoffauflauf einer papiermaschine
US4832794A (en) * 1986-08-26 1989-05-23 Valmet Oy Method and apparatus for compensating deflection of a lip beam in a paper machine
US5164048A (en) * 1990-08-29 1992-11-17 Measurex Corporation Cooling structure for stabilizing the temperature of beams in a sheet-making apparatus
US5165277A (en) * 1990-08-29 1992-11-24 Measurex Corporation System and process for determining properties of a moving sheet of material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3614302C2 (de) * 1985-11-19 1996-02-29 Voith Sulzer Papiermasch Gmbh Vorderwand mit Abstützung am Stoffauflauf einer Papiermaschine
CN114777329B (zh) * 2022-04-02 2023-07-28 山鹰国际控股股份公司 一种流浆箱外置恒温加热自动控制系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992539A (en) * 1933-08-30 1935-02-26 Niagara Machine & Tool Works Power shear and the like
US3106153A (en) * 1961-03-09 1963-10-08 Beloit Iron Works Controllable deflection roll
US3313681A (en) * 1964-08-27 1967-04-11 Beloit Corp Headbox with bottom wall having controllable deflection
US3334011A (en) * 1964-12-18 1967-08-01 Allis Chalmers Mfg Co Headbox with torsion beam support

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1992539A (en) * 1933-08-30 1935-02-26 Niagara Machine & Tool Works Power shear and the like
US3106153A (en) * 1961-03-09 1963-10-08 Beloit Iron Works Controllable deflection roll
US3313681A (en) * 1964-08-27 1967-04-11 Beloit Corp Headbox with bottom wall having controllable deflection
US3334011A (en) * 1964-12-18 1967-08-01 Allis Chalmers Mfg Co Headbox with torsion beam support

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3769154A (en) * 1969-12-13 1973-10-30 Voith Gmbh J M Pressurized chambers for controlling deflection of papermaking machine headbox walls
US3734822A (en) * 1970-10-16 1973-05-22 Black Clawson Co Headbox for vertical double-wire paper machine
US3977938A (en) * 1973-05-21 1976-08-31 Dominion Engineering Works, Limited Support beam for the rectifier section of a headbox
US4539073A (en) * 1981-12-01 1985-09-03 Kmw Aktiebolag Method and apparatus for measuring the size of a discharge slot in a headbox
US4552619A (en) * 1983-05-11 1985-11-12 A. Ahlstrom Osakeyhtio Thermal stabilizing system for a headbox of a papermachine
US4539074A (en) * 1983-05-27 1985-09-03 Kmw Aktiebolag Method and apparatus for detecting and counteracting a deformation of the stock discharge gap in a headbox of a paper machine
EP0127036A3 (en) * 1983-05-27 1986-06-25 Kmw Aktiebolag Method and apparatus for detecting and counteracting a deformation of the stock discharge gap in a headbox of a paper machine
DE3613509A1 (de) * 1985-11-22 1987-05-27 Escher Wyss Gmbh Vorderwand am stoffauflauf einer papiermaschine
US4832794A (en) * 1986-08-26 1989-05-23 Valmet Oy Method and apparatus for compensating deflection of a lip beam in a paper machine
US5164048A (en) * 1990-08-29 1992-11-17 Measurex Corporation Cooling structure for stabilizing the temperature of beams in a sheet-making apparatus
US5165277A (en) * 1990-08-29 1992-11-24 Measurex Corporation System and process for determining properties of a moving sheet of material

Also Published As

Publication number Publication date
GB1112134A (en) 1968-05-01
DE1511240A1 (de) 1969-07-24
SE315195B (enrdf_load_stackoverflow) 1969-09-22
FI42662B (enrdf_load_stackoverflow) 1970-06-01

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VALMET-DOMINION INC., 795 FIRST AVENUE, LACHINE, Q

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VALMET OY;REEL/FRAME:004331/0750

Effective date: 19840503