US3832282A - Submerged twin wire paper former - Google Patents

Submerged twin wire paper former Download PDF

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Publication number
US3832282A
US3832282A US00187062A US18706271A US3832282A US 3832282 A US3832282 A US 3832282A US 00187062 A US00187062 A US 00187062A US 18706271 A US18706271 A US 18706271A US 3832282 A US3832282 A US 3832282A
Authority
US
United States
Prior art keywords
wires
forming
stock
throat
jet
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
US00187062A
Other languages
English (en)
Inventor
J Parker
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.)
Beloit Corp
Original Assignee
Beloit 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
Priority to BE789468D priority Critical patent/BE789468A/xx
Application filed by Beloit Corp filed Critical Beloit Corp
Priority to US00187062A priority patent/US3832282A/en
Priority to GB4044872A priority patent/GB1406456A/en
Priority to ZA726094A priority patent/ZA726094B/xx
Priority to AU46348/72A priority patent/AU4634872A/en
Priority to CA151,355A priority patent/CA972995A/en
Priority to ES406668A priority patent/ES406668A1/es
Priority to NL7212975A priority patent/NL7212975A/xx
Priority to FR7235239A priority patent/FR2155586A5/fr
Priority to AR244437A priority patent/AR199187A1/es
Priority to DE19722248454 priority patent/DE2248454A1/de
Priority to JP47099175A priority patent/JPS5129203B2/ja
Priority to BR006944/72A priority patent/BR7206944D0/pt
Priority to IT30114/72A priority patent/IT968646B/it
Application granted granted Critical
Publication of US3832282A publication Critical patent/US3832282A/en
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
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to an improved structure and means for forming a web of paper between parallel converging dewatering wires and particularly to improvements in the relationship of structures which deliver a jet of stock to a tapered forming throat between the wires which avoid the problems of high-speed formation that are associated with free surfaces, entrainment of air, roughness of the free jet and spray or splash.
  • the present invention provides a structure and method wherein the nip between the forming wires and the discharge from the headbox is completely submerged. This arrangement provides for the total exclusion of air from the initial drainage zone.
  • the concept includes completely protecting and submerging the jet of stock which emerges from a slice opening until it enters the forming throat between forming wires and to completely submerge the nip between the forming wires and to further submerge the otirunning side of the breast rolls carrying the forming wires. This insures the absence of any free surface of the discharge jet emerging from the slice opening.
  • An advantage of submerging the initial area of a twin wire forming system is that the problems associated with free surfaces, entrainment of air, roughness of the free jet, spray or splash, are avoided. Also, the arrangement eliminates the need for complicated sealing devices between the headbox and twin wire nip so that more conventional discharge nozzles and forming nip configurations can be used.
  • a further object of the invention is to provide an improved twin wire forming mechanism with improvements at the forming throat portion of the machine which avoids difi'iculties heretofore encountered and improves the formation of a paper web.
  • FIG. 1 is a schematic end elevational view of a forming section of a paper machine constructed and Operating in accordance with the principles of the present invention
  • FIG. 2 is a schematic fragmentary side elevational view showing one end of the mechanism of FIG. 1;
  • FIG. 3 is a fragmentary end elevational view of another form of operation of the mechanism of the invention.
  • Stock is delivered in a jet 25 from a headbox 23 having a slice opening 24.
  • the stock jet 25 emerges from the opening 24 at a relatively high velocity which is substantially at the velocity of the traveling wires 10 and 11. While the structure could operate in other positions, a vertical delivery of the stock jet 25 is preferred.
  • a horizontal arrangement is possible by training the wire web sandwich over a roll before exit from the liquid.
  • the liquid within the tank protects and confines the open stream of stock 25 emerging from the slice opening 24. This prevents air entrainment and free surface disturbances of the stock within the jet 25 during the time it is traveling from the slice opening to the forming throat 14.
  • the water in the submerging tank 26 also preferably is of a depth so that it covers the breast rolls on the offrunning side in the area 28. An important reason for submergence of the rolls is to minimize entrainment of air through a free surface by moving parts. By submerging the rolls, you have to contend only with wires on the return run entering the free surface.
  • the jet is confined to a width so that it will pass freely between the breast rolls and will not engage the wires until beyond their point of tangency to the wires to avoid pumping.
  • the container 26 preferably contains white water and the entry of a certain amount of water with the wires within their interstices performs a sealing function since this water will emerge from the wires back into the container as the wires begin to converge in the throat 14 and begin to squeeze water from the stock. Also, White water extracted from the stock in the throat 14 passes into the container which serves as a receptacle for water expressed from the web.
  • an excess of stock is delivered to the space between the rolls so that a back flow of stock occurs.
  • the outer layer of stock will flow into the container as back flow and only the inner strata of stock will enter between the breast rolls.
  • wires 30 and 31 are shown supported on breast rolls 33 and 34 to form a forming throat 32.
  • the headbox 35 has a slice opening 36 and the structure is surrounded by an enveloping chamber of liquid 38.
  • the breast rolls have adjusting structure 33a and 34a which permit the adjustment of the positions relative to each other. This adjustment with the supply of a surplus of stock can be used to control the basis weight of the paper formed.
  • an impingement means or bafile 29 may be provided between the space 28 between the breast rolls and the slice opening 24. These impingement means may be used to block a portion of the jet and reduce the thickness of the stock jet to control the basis weight.
  • the bafile 29 may be adjustable and be flexible or of multi parts and positionable toward or away from the jet along their lengths to control the basis weight across the web which is formed.
  • the container with its sealing liquid extends over the ends of the rolls to seal the ends as shown in FIG. 2.
  • a structure for making a web from a slurry of fiber containing stock comprising in combination:
  • wire guides for said wires forming a nip therebetween guiding said wires together in a tapered forming throat followed by a forming run wherein the wires travel generally parallel with water passing out through the wires and a web being carried between them,
  • the forming run being located outside said container to be out of contact with the liquid in the container.
  • a structure for making a web from a slurry of fiber containing stock constructed in accordance with claim 1 wherein said guides which provide said forming throat are rolls, and said rolls are also completely submerged in the liquid in said container.
  • a structure for making a web from a slurry of fiber containing stock constructed in accordance with claim 1 wherein said wires travel upwardly in said throat and said slice opening is oriented such that the jet is projected upwardly into the throat.
  • a structure for making a web from a slurry of fiber containing stock constructed in accordance with claim 1 including means positioned between the slice opening and the throat afiecting the flow stream from the slice opening and being locally adjustable for affecting the crossmachine basis weight profile of the web.
  • a structure for making a web from a slurry of fiber containing stock constructed in accordance with claim 4 wherein said means affecting the flow stream is in the form of a baflle.
  • a structure for making a web from a slurry of stock comprising in combination,
  • wire guides for said wires guiding the wires together in a tapered forming throat followed by a forming run wherein the wires travel generally parallel with the web between them,
  • a headbox having a slice opening delivering a jet of stock to said forming throat
  • a container positioned for containing non-stock containing liquid on each side of the jet and submerging the slice opening and the forming wires in the throat thereby excluding air from entering the forming throat and preventing splash, said forming run being located outside of said container to be out of contact with the liquid in the container.
  • a structure for making a web from a slurry of stock constructed in accordance with claim 8 and including breast rolls within the forming wires guiding the wires into said throat and including Water on the offrunning side of said rolls between the wire and rolls preventing pumping of the stock entering the throat.
  • a structure for making a web from a slurry of fiber containing stock comprising in combination,
  • wire guides for said wires forming a nip therebetween guiding said wires together in a tapered. forming throat foll wed by a forming run wherein the wires travel generally parallel with water passing out through the wires and a web being carried between them,
  • a headbox Having a pressure slice opening positioned in alignrnfnt with said throat for delivering a pressure jet ofif stock directly into said throat
  • a liquid container having a depth for holding a liquid at? sufficient level for submerging the nip between ,the wires and said pressure jet of stock entering [the forming zone so that the pressure jet emerging? rom the slice opening does not entrain air in entering the throat.

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  • Paper (AREA)
US00187062A 1971-10-06 1971-10-06 Submerged twin wire paper former Expired - Lifetime US3832282A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
BE789468D BE789468A (fr) 1971-10-06 Structure a deux toiles submergee pour formation de feuille continue
US00187062A US3832282A (en) 1971-10-06 1971-10-06 Submerged twin wire paper former
GB4044872A GB1406456A (en) 1971-10-06 1972-08-31 Twin wire former
ZA726094A ZA726094B (en) 1971-10-06 1972-09-06 Submerged twin wire former
AU46348/72A AU4634872A (en) 1971-10-06 1972-09-06 Submerged twin wire former
CA151,355A CA972995A (en) 1971-10-06 1972-09-11 Submerged twin wire former
ES406668A ES406668A1 (es) 1971-10-06 1972-09-14 Perfeccionamientos introducidos en estructura para con- feccionar un rollo de papel continuo de un fango de pasta papelera conteniendo fibras.
NL7212975A NL7212975A (de) 1971-10-06 1972-09-26
FR7235239A FR2155586A5 (de) 1971-10-06 1972-09-26
AR244437A AR199187A1 (es) 1971-10-06 1972-10-03 Aparato productor de papel para producir una lamina de papel y un procedimiento para producirla
DE19722248454 DE2248454A1 (de) 1971-10-06 1972-10-03 Doppel-siebband-papierherstellungsmaschine
JP47099175A JPS5129203B2 (de) 1971-10-06 1972-10-04
BR006944/72A BR7206944D0 (pt) 1971-10-06 1972-10-05 Estrutura para fazer uma tela de fibras a partir de uma materia prima contendo uma suspensao de fibra e processo para operar a dita estrutura
IT30114/72A IT968646B (it) 1971-10-06 1972-10-05 Dispositivo formatore di un nastro di carta a doppia tela formatrice sommersa

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00187062A US3832282A (en) 1971-10-06 1971-10-06 Submerged twin wire paper former

Publications (1)

Publication Number Publication Date
US3832282A true US3832282A (en) 1974-08-27

Family

ID=22687463

Family Applications (1)

Application Number Title Priority Date Filing Date
US00187062A Expired - Lifetime US3832282A (en) 1971-10-06 1971-10-06 Submerged twin wire paper former

Country Status (14)

Country Link
US (1) US3832282A (de)
JP (1) JPS5129203B2 (de)
AR (1) AR199187A1 (de)
AU (1) AU4634872A (de)
BE (1) BE789468A (de)
BR (1) BR7206944D0 (de)
CA (1) CA972995A (de)
DE (1) DE2248454A1 (de)
ES (1) ES406668A1 (de)
FR (1) FR2155586A5 (de)
GB (1) GB1406456A (de)
IT (1) IT968646B (de)
NL (1) NL7212975A (de)
ZA (1) ZA726094B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2827840A1 (de) * 1977-06-27 1979-01-18 Black Clawson Co Papiermaschine mit vertikalem doppelsiebband
US4234382A (en) * 1977-12-08 1980-11-18 J. M. Voith Gmbh Former for a paper machine
US5141600A (en) * 1988-05-06 1992-08-25 J. M. Voith Gmbh Twin-wire former
US5160583A (en) * 1991-12-02 1992-11-03 Beloit Corporation Controlled jet injection apparatus for a papermaking machine headbox
US5599427A (en) * 1991-03-15 1997-02-04 Valmet Corporation Twin-wire web former in a paper machine
US5868903A (en) * 1994-10-14 1999-02-09 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Device for dewatering and/or washing suspensions, in particular suspensions of fibrous materials

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2908791C3 (de) * 1979-03-07 1981-08-13 J.M. Voith Gmbh, 7920 Heidenheim Bahnbildungsabschnitt der Siebpartie einer Papiermaschine
GB2306353B (en) * 1995-10-28 1998-10-07 Rolls Royce Plc A method of manufacturing a blade
FI107056B (fi) * 1999-01-19 2001-05-31 Metso Paper Inc Sovitelma kuiturainan leveyden säätämiseksi

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2827840A1 (de) * 1977-06-27 1979-01-18 Black Clawson Co Papiermaschine mit vertikalem doppelsiebband
US4234382A (en) * 1977-12-08 1980-11-18 J. M. Voith Gmbh Former for a paper machine
US5141600A (en) * 1988-05-06 1992-08-25 J. M. Voith Gmbh Twin-wire former
US5599427A (en) * 1991-03-15 1997-02-04 Valmet Corporation Twin-wire web former in a paper machine
US5160583A (en) * 1991-12-02 1992-11-03 Beloit Corporation Controlled jet injection apparatus for a papermaking machine headbox
US5868903A (en) * 1994-10-14 1999-02-09 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Device for dewatering and/or washing suspensions, in particular suspensions of fibrous materials

Also Published As

Publication number Publication date
ZA726094B (en) 1973-05-30
AU4634872A (en) 1974-03-14
ES406668A1 (es) 1975-09-16
BE789468A (fr) 1973-01-15
FR2155586A5 (de) 1973-05-18
NL7212975A (de) 1973-04-10
GB1406456A (en) 1975-09-17
CA972995A (en) 1975-08-19
JPS4845606A (de) 1973-06-29
DE2248454A1 (de) 1973-04-12
IT968646B (it) 1974-03-20
BR7206944D0 (pt) 1973-07-26
AR199187A1 (es) 1974-08-14
JPS5129203B2 (de) 1976-08-24

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