US3801435A - Paper machine saveall with de-aerator - Google Patents

Paper machine saveall with de-aerator Download PDF

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Publication number
US3801435A
US3801435A US00278551A US3801435DA US3801435A US 3801435 A US3801435 A US 3801435A US 00278551 A US00278551 A US 00278551A US 3801435D A US3801435D A US 3801435DA US 3801435 A US3801435 A US 3801435A
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US
United States
Prior art keywords
jet
casing
saveall
machine
mouth
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
US00278551A
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English (en)
Inventor
A Malashenko
G Tidbury
R Futcher
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.)
General Electric Canada Co
Valmet Montreal Inc
Original Assignee
Dominion Engineering Works Ltd
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.)
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Publication date
Application filed by Dominion Engineering Works Ltd filed Critical Dominion Engineering Works Ltd
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Publication of US3801435A publication Critical patent/US3801435A/en
Assigned to VALMET-DOMINION INC. reassignment VALMET-DOMINION INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: CANADIAN GENERAL ELECTRIC COMPANY LIMITED- COMPANIE GENERAL ELECTRIQUE DU CANADA LIMITEE
Assigned to CANADIAN GENERAL ELECTRIC COMPANY LIMITED- COMPAGNIE GENERALE ELECTRIQUE DU CANADA LIMITEE reassignment CANADIAN GENERAL ELECTRIC COMPANY LIMITED- COMPAGNIE GENERALE ELECTRIQUE DU CANADA LIMITEE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: DOMINION ENGINEERING WORKS LIMITED
Assigned to VALMET-DOMINION INC. reassignment VALMET-DOMINION INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CANADIAN GENERAL ELECTRIC COMPANY LIMITED,, DOMINION ENGINEERING WORKS LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/07—Water collectors, e.g. save-alls

Definitions

  • PAPER MACHINE SAVEALL WITH DE -AERATOR Inventors: Alexander Malashenko, Pointe Claire; Gordon Thomas Tidbury, Vaudreuil; Ralph James Futcher, Beaconsfield, Quebec, all of Canada Assignee: Dominion Engineering Works,
  • ABSTRACT A jet deflector for use as a saveal] in a paper machine having a wide cellular roll discharging water substantially tangentially therefrom as a high speed jet extending the full width of the machine and projected into a zone of restricted access which deflector has an entry to receive the jet, a plurality of inclined, curved and twisted deflector plates, and an egg shaped flow section to receive, divert and blend the discrete entering jets into a high velocity transversely flowing stream for passage from the machine.
  • This invention is directed to a method of dewatering a paper machine, and to a saveall for a paper machine, and in particular to a saveall for a high speed jet to provide transverse discharge at high flow rates from a zone of limited accessibility.
  • twin wire machines utilizing a suction forming roll about which the forming wires are wrapped and from which roll the white water is released as a high velocity coherent jet, such as the paper machine trade marked Papriformer developed by the Pulp and Paper Institute of Canada
  • a method for disposing of a high speed jet extending the full width of the machine and issuing in the direction of wire travel from the surface of a roll has been evolved wherein the jet is segregated into a plurality of discrete coherent jet portions of limited transverse dimension; a transverse deflection component is applied in the direction of discharge; a centrifugal deflection component is applied having the initial jet direction tangent thereto; and the resultant deflected jet portions are then blended into a high velocity smoothly flowing transversely directed flow for passage from the machine.
  • a saveall comprising transversely elongated walls defining a jet receiving aperture extending the full width of the machine to be dewatered, thewalls being spaced apart a sufficient distance to receive the full depth of the jet and extending initially in substantially the same direction as the incident jet; a curved blocking portion of one of the walls extending across the thickness of the path of the jet in deflecting relation therewith to provide a centrifugal component of motion to an entering 1 jet; a plurality of deflector plates spaced across the width of the jet and sloping towards the curved wall portion in the direction of jet transverse discharge divide the jet into discrete jet portions; and a transversely extending flow passage receiving the deflected high ve locity jet portions in blending flow therethrough.
  • the transverse spacing of the deflector plates in the cross machine direction is selected so that the interval is sufficiently small to ensure effective transverse deflection across the full width of each zone, between adjacent plates.
  • the transverse inclination or angle of outward slope of the deflector plates is limited to avoid choking in the triangular root portions thus formed. An angle of inclination of about 35 between the edges of the jet entry has been found to be effective.
  • One effective curvature of the deflector plates has been found to be substantially cylindrical, the plates being made from steel sheet and given a slight warp to progressively increase the transverse deflection at the centrifugally outer edge thereof.
  • a particular result provided by the subject catchall is the centrifugal deaeration of the white water which may be achieved.
  • the white water after passage through a forming wire, is initially held in the foraminous shell of the forming roll and subsequently released therefrom under centrifugal force, at a velocity approaching that of the high speed forming wire.
  • FIG. 1 is a general view of a catchall according to the present invention
  • FIG. 2 is a cross sectional view at 2-2 of FIG. 1;
  • FIG. 3 is a front or head-on sectional view at 3-3 of FIG. 2;
  • FIG. 4 is a plan view of a blade member of the catchall.
  • the catchall 10 has a casing 12 of wrapped section for extending transversely across the machine.
  • Wall portions 14, 16 of the casing 12 define an entrance mouth of rectangular cross section having a plurality of deflector blades 18 spaced thereacross.
  • the blades 18 at the mouth are inclined from their top edge adjoining the surface 14, being twisted substantially uniformly along their respective lengths to exert a transverse deflection to incoming liquid.
  • the form and arrangement of the blades 18, as secured in the casing 12, thus provides separation of the inflowing jet into discrete portions that are deflected downwardly by the combined form of the blades 18 and the downward curve of the casing 12.
  • the curve or transverse displacement of the blades 18 produces regulated transverse deflection of the discrete jets, while the twist of the blades 18 produces a wrap-over effect complementary to the downward curve of the back inner surface 20 of the casing 12.
  • an incoming aerated jet is deflected downwardly and transversely into a contained high velocity liquid flow.
  • the effect of this controlled deflection is to provide separation of air, from the entrapped air entering with the white water jet into the catchall.
  • the entrapped air tends to separate by centrifugal action, and is bled-off by way of an air bleed aperture 22 that connects the interior of casing 12 with an air trunking 24 attached to the top wall of casing 12. Direct entry of liquid into the aperture 22 is precluded by the fact that the aperture or slot 22 opens in a downstream-facing direction, adjacent the incoming jet.
  • a passage bounded by walls 29 or a series of pipes equivalent thereto connect the air trunking 24 with a suitable vacuum header 28.
  • a suitable downcomer pipe (not shown) connected with the outlet end of the catchall permits transference of the white water to the pit or holding tank.
  • a method of dewatering a high speed paper machine wherein a wide jet of water of limited depth and extending laterally in the cross-machine direction is projected through the air as a substantially planar jet at high velocity in a direction normal to said crossmachine direction, comprising the steps of: directing the jet towards a save-all having a pair of opposed wall portions defining lips of an inlet mouth, which lips receive the jet therebetween, said mouth being surrounded by a curved casing, separating the jet into a plurality of discrete jet portions by a plurality of parallel deflection plates spaced across the mouth, said deflector plates being l) curved along their respective lengths to produce a substantially uniform transverse deflection of the discrete jet portions from the mouth to the casing, and (2) twisted along their respective lengths to produce a wrap-over motion of the discrete jet portions, which motion being complimentary to the curve of the casing, whereby the curved and twisted parallel deflection plates promote centrifugal separation of the air from the water in said casing

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  • Paper (AREA)
US00278551A 1971-08-12 1972-08-07 Paper machine saveall with de-aerator Expired - Lifetime US3801435A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA120350A CA937084A (en) 1971-08-12 1971-08-12 Paper machine saveall with de-aerator

Publications (1)

Publication Number Publication Date
US3801435A true US3801435A (en) 1974-04-02

Family

ID=4090567

Family Applications (1)

Application Number Title Priority Date Filing Date
US00278551A Expired - Lifetime US3801435A (en) 1971-08-12 1972-08-07 Paper machine saveall with de-aerator

Country Status (8)

Country Link
US (1) US3801435A (OSRAM)
JP (1) JPS52124B2 (OSRAM)
CA (1) CA937084A (OSRAM)
DE (1) DE2238297A1 (OSRAM)
FR (1) FR2150052A5 (OSRAM)
GB (1) GB1357854A (OSRAM)
IT (1) IT963463B (OSRAM)
SE (1) SE387979B (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960653A (en) * 1972-07-18 1976-06-01 Dominion Engineering Works, Limited Downflow control system for web making machines
WO2016189101A1 (en) 2015-05-27 2016-12-01 Valmet Aktiebolag Apparatus an method for processing white water in a paper machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3532716A1 (de) * 1985-07-30 1987-02-12 Escher Wyss Gmbh Vorrichtung zum abbremsen schiessender stroemungen von siebwasser
JP2595379B2 (ja) * 1990-11-27 1997-04-02 ハイモ株式会社 植物生育基盤造成のための吹き付け工法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960653A (en) * 1972-07-18 1976-06-01 Dominion Engineering Works, Limited Downflow control system for web making machines
WO2016189101A1 (en) 2015-05-27 2016-12-01 Valmet Aktiebolag Apparatus an method for processing white water in a paper machine
WO2016189100A1 (en) 2015-05-27 2016-12-01 Valmet Aktiebolag Apparatus and method for processing white water in a paper machine
US10550517B2 (en) 2015-05-27 2020-02-04 Valmet Aktiebolag Apparatus and method for processing white water in a paper machine
US11028533B2 (en) 2015-05-27 2021-06-08 Valmet Aktiebolag Apparatus and method for processing white water in a paper machine

Also Published As

Publication number Publication date
IT963463B (it) 1974-01-10
CA937084A (en) 1973-11-20
DE2238297A1 (de) 1973-02-22
JPS52124B2 (OSRAM) 1977-01-05
FR2150052A5 (OSRAM) 1973-03-30
SE387979B (sv) 1976-09-20
JPS4827005A (OSRAM) 1973-04-10
GB1357854A (en) 1974-06-26

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Legal Events

Date Code Title Description
AS Assignment

Owner name: VALMET-DOMINION INC., 795 1ST AVE., LACHINE, QUEBE

Free format text: MERGER;ASSIGNOR:CANADIAN GENERAL ELECTRIC COMPANY LIMITED- COMPANIE GENERAL ELECTRIQUE DU CANADA LIMITEE;REEL/FRAME:004282/0761

Effective date: 19840416

Owner name: CANADIAN GENERAL ELECTRIC COMPANY LIMITED- COMPAGN

Free format text: CHANGE OF NAME;ASSIGNOR:DOMINION ENGINEERING WORKS LIMITED;REEL/FRAME:004301/0844

Effective date: 19840510

Owner name: VALMET-DOMINION INC., 795 FIRST AVE., LA CHINE, QU

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:CANADIAN GENERAL ELECTRIC COMPANY LIMITED,;DOMINION ENGINEERING WORKS LIMITED;REEL/FRAME:004282/0775

Effective date: 19840416